EP0070002A1 - Appareil à jet, en particulier pour le traitement par jet d'abrasif à air comprimé - Google Patents

Appareil à jet, en particulier pour le traitement par jet d'abrasif à air comprimé Download PDF

Info

Publication number
EP0070002A1
EP0070002A1 EP82106144A EP82106144A EP0070002A1 EP 0070002 A1 EP0070002 A1 EP 0070002A1 EP 82106144 A EP82106144 A EP 82106144A EP 82106144 A EP82106144 A EP 82106144A EP 0070002 A1 EP0070002 A1 EP 0070002A1
Authority
EP
European Patent Office
Prior art keywords
blasting
area
nozzle
blasting device
joint parts
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.)
Granted
Application number
EP82106144A
Other languages
German (de)
English (en)
Other versions
EP0070002B1 (fr
Inventor
Karl Christian Ing. Glaeser
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.)
Ernst Peiniger GmbH Unternehmen fur Bautenschutz
Original Assignee
Ernst Peiniger Unternehmen fur Bautenschutz GmbH
Ernst Peiniger GmbH Unternehmen fur Bautenschutz
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 Ernst Peiniger Unternehmen fur Bautenschutz GmbH, Ernst Peiniger GmbH Unternehmen fur Bautenschutz filed Critical Ernst Peiniger Unternehmen fur Bautenschutz GmbH
Priority to AT82106144T priority Critical patent/ATE16083T1/de
Publication of EP0070002A1 publication Critical patent/EP0070002A1/fr
Application granted granted Critical
Publication of EP0070002B1 publication Critical patent/EP0070002B1/fr
Expired 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
    • 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
    • B05B7/14—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 designed for spraying particulate materials
    • B05B7/1481—Spray pistols or apparatus for discharging particulate material
    • B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor

Definitions

  • the invention relates to a blasting device, in particular for compressed air blasting, with a hose-like feed line that can be connected on the input side to a source for a mixture of compressed inert air and a blasting agent and that has an essentially constant internal cross-section, and with a nozzle area that can be connected to the feed line on the output side elongated, GF, starting from the internal cross-section of the supply line to a nozzle throat narrowing tapered area and g. having a subsequent thereto extension area.
  • a granular blasting agent usually sand
  • a blasting device against a surface to be treated with the aid of a carrier air stream.
  • the aim is to achieve high speeds of impact of the granular abrasive on the surface to be treated.
  • the exit velocity of the grains of the blasting medium emerging from the nozzle area is frequently above 100 m / sec.
  • the mixture of the carrier air and the blasting medium is under high pressure in relation to the atmosphere in the feed line, but the speed of the flight promotion of the granular blasting medium is low.
  • the pressure of the air in the nozzle area is converted into kinetic energy in a known manner, as described in the Bernoulli equation. Due to the high velocity of the air flow forced in the nozzle constriction, the individual grains of the abrasive are also accelerated at this point. Inevitably, however, the speed of the grains of the abrasive is never greater than the speed of the air flow and in practice is actually much lower than the speed of the air flow.
  • a high exit velocity of the grains of the abrasive from the nozzle area is achieved in that the veining area, i.e. the area in which the pressure of the air stream is converted into kinetic energy, is relatively long (cf. DE-OS 28 43 013).
  • the distance available to accelerate the grains of the blasting medium is so great that the speed of the grains at the end of this acceleration path, ie behind the nozzle constriction, is in the range of the speed of the air. If the speed of the air flow emerging from the nozzle area is to be in the range or above the speed of sound of the air, an expansion area must be provided so that a Laval nozzle is formed overall.
  • the grains of the abrasive also accelerate further.
  • the constriction area is made relatively long, the nozzle area is given a considerable overall length. This disadvantage has already been recognized.
  • the blasting device according to the invention in which the above-mentioned object is achieved, is characterized in that the nozzle area is poly g onzu g at least on a portion of its total length of several rigid and straight pipe sections connected to one another via joint parts.
  • the nozzle area is poly g onzu g at least on a portion of its total length of several rigid and straight pipe sections connected to one another via joint parts.
  • the deflection of the carrying air stream loaded with blasting agent takes place practically only in the area of the joint parts.
  • These and the adjacent end regions of the straight pipe sections can, however, be made from a very abrasion-resistant material, for example tungsten carbide or boron carbide, so that they have a sufficient service life.
  • the joint parts can advantageously be effectively protected against wear by having their inner surfaces outside the actual path of the air flow.
  • a very effective combination is thus achieved, since very abrasion-resistant material can be used for the parts that come into direct contact with the abrasive and the joint parts can also be abrasion-resistant or can be designed in such a way that they are protected from the abrasive .
  • a particularly advantageous embodiment of the blasting device according to the invention is provided in that an expansion area is connected to the constriction area and this expansion area has 2 to 3 times, preferably 2.5 times the length of the constriction area.
  • the blasting device it may be advisable to produce at least a portion of the constriction area that is connected to the feed line from a resilient material, for example, to form it in one piece with the feed line.
  • a resilient material for example, to form it in one piece with the feed line.
  • the speed of the grains of the blasting medium is still so low that the abrasive effect can be neglected.
  • the advantages of the section of the nozzle area which is designed like a polygonal pull are thus particularly evident in the areas of high speed of the grains of the blasting medium, that is to say in the vicinity of the outlet end of the nozzle area.
  • the adjacent to the nozzle throat part of the throat region and the entire civilsbereict from polygonzugarti g s sections should therefore be established.
  • the joint parts of the blasting device according to the invention can be designed as ball joints, the individual balls each have an inner passage for the air stream loaded with the blasting agent.
  • simple joints are possible with a fixed swivel axis arranged transversely to the direction of flight of the blasting medium, it being advisable to offset successive swivel axes by 90 ° so that movement in space is also possible.
  • elastic or resilient sleeves are available for connecting two rigid pipe sections. These do not have to be made from a material that is sufficiently abrasion-resistant if they are completely outside the trajectory of the abrasive.
  • a feed line 1 is connected to a nozzle area 2.
  • the supply line 1 is connected on the input side to a source (not shown) for a mixture of compressed inert air and an abrasive. They. is made of a resilient material and is therefore flexible.
  • the inner cross section of the feed line 1 is constant over the entire length and is designed so that the blasting medium is promoted at low speed by the grains of this blasting medium.
  • the feed line 1 is connected to the nozzle area 2, which is composed of an elongated narrowing area 3 and an extension area 4 that continues this. Between the two is a nozzle constriction 5, the point of the smallest internal cross section of the entire arrangement.
  • the nozzle area 2 consists of a total of ten individual, rigid and straight pipe sections 6, 7 and 8, the inner wall of which is shaped and which are arranged such that they limit a uniformly tapering and subsequently widening imaginary body when the nozzle area 2 is straight.
  • this body is composed of two truncated cones, which lie against one another with their circular area of smaller diameter - namely the diameter of the nozzle constriction 5.
  • This imaginary body contains the trajectories of the grains of the abrasive.
  • the individual pipe sections 6, 7 and 8 are arranged one behind the other such that an annular space 9 remains free.
  • the length of the intermediate space 9 is approximately 20% of the length of an individual pipe section 6, 7, 8. This creates free spaces for articulated movement between the rigid pipe sections 6, 7, 8.
  • the total of ten pipe sections 6, 7, 8 are coated on the outside with a jacket 10, which ensures the relative arrangement of the individual pipe sections 6, 7, 8.
  • the jacket 10 merges in one piece into the feed line 1.
  • the material of the jacket 10 thus has the same elastic and resilient properties as the feed line 1.
  • the regions of the jacket 10 located outside the annular spaces 9 allow articulation between adjacent pipe sections 6, 7, 8 and thus form the articulated parts 11.
  • each Such joint part 11 is limited in that the annular space 9 closes at one point when adjacent pipe sections 6, 7, 8 abut.
  • the front edges of opposite pipe sections 6, 7, 8 are bevelled so that the annular space 9 widens outward in a V-shape. As a result, the edges of smaller diameter initially come into contact with opposite pipe sections 6, 7, 8 at the maximum bending angle.
  • the annular spaces 9 form a discontinuity and thus disrupt the passage of the air stream loaded with the abrasive, but they enable the joint parts 11, which are formed from a relatively inexpensive and less abrasion-resistant material, to lie in the shadow areas of the air stream and thus are largely protected from the abrasive effect of the abrasive.
  • the annular spaces 9 fill more or less with grains of the blasting agent as deposits 12; these deposits 12 of the blasting agent protect the joint parts 11 of the jacket 10 against directly impacting, fast-flying granules of the blasting agent.
  • the tube pieces 6 of the constriction area 3 are designed as conical jacket rings converging in the direction of flight (arrow 13).
  • the pipe sections 8 of the extension area 4 are conical casing rings.
  • the pipe section 7, in which the nozzle constriction 5 is formed, is both part of the constriction area 3 and part of the expansion area 4 and accordingly consists of a conically narrowing conical jacket ring and a conically expanding conical jacket ring.
  • the pipe sections 6, 7, 8 are made of a very abrasion-resistant material.
  • the jacket 10 is connected in a suitable manner to the outer walls of the tube pieces 6, 7, 8; for example, it has shrunk.
  • the jacket 10 in particular its hinge parts 11, it may be advisable to arrange short coil springs between the individual pipe sections 6, 7, 8, which push the adjacent pipe sections 6, 7, 8 apart and thereby always keep the entire nozzle area 2 in its straight line Press shape.
  • the feed line 1 is shrunk onto the first pipe section 6 seen in the direction of flight (arrow 13) of the grains of the abrasive, so that the transition area between the feed line 1 and the nozzle area 2 is smooth is and therefore practically does not affect the air flow.
  • the individual pipe sections 6 of the nozzle area 2 according to FIG. 2, which has only one constriction area 3, are connected to one another via joint parts 14 designed as bellows.
  • the inlet ends 15 of the pipe sections 6 are rounded, so that when the joint parts 14 bend, there are no sharp edges opposite the air flow.
  • the joint parts 11 and 14 are each outside the actual path of the flying abrasive grains.
  • the material for the joint parts 11, 14, only the elasticity or resilience is decisive, but not the abrasion resistance. Rather, it is to be regarded as a particular advantage of these two exemplary embodiments that both mechanical functions (Flexibility and abrasion resistance) are separated.
  • the joint part 16 in the exemplary embodiment according to FIG. 3 comes into direct contact with the accelerated abrasive and must therefore be made of an abrasion-resistant material at least in the area of these contact points.
  • the joint part 16 is designed as a ball joint and is composed of a spherical body 17 with an inner passage 18, spherical shells 19 on the adjacent pipe pieces 6 and a capsule 20.
  • the ball body 17 forms the innermost part of this arrangement, its inner passage 18 narrows approximately diabolically towards the center of the ball and has two openings 21 remains free.
  • the diameter of the mouths 22 is - as will be explained later - so coordinated with the maximum swivel angle of each individual pipe piece 6 and the diameter of the opening 21 that the mouth 22 can never be outside the opening 21.
  • the right pipe section 6 in FIG. 3 is deflected as far down as possible, the left pipe section 6 is in its central position.
  • Fine angular braking is achieved in that the front outer surfaces of the spherical shell 19 abut a stop 23 of the capsule 20.
  • the capsule 20 has holding areas 24 which press the spherical shells 19 against the spherical body 17 and thus hold the joint part 16 together.
  • the total length of the constriction area 3 of a blasting device according to the invention is approximately 50 to 100 cm. Together with an expansion region 4 which is approximately 2.5 times longer, the entire nozzle region 2 thus has a considerable length of approximately 1.75 m to 3.50 m. Such long nozzle areas 2 can, however, be handled if, as proposed here, they are designed in the manner of a polygon.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Cleaning In General (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
EP82106144A 1981-07-09 1982-07-09 Appareil à jet, en particulier pour le traitement par jet d'abrasif à air comprimé Expired EP0070002B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82106144T ATE16083T1 (de) 1981-07-09 1982-07-09 Strahlgeraet, insbesondere fuer das druckluftstrahlen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813127074 DE3127074A1 (de) 1981-07-09 1981-07-09 Strahlgeraet, insbesondere fuer das druckluftstrahlen
DE3127074 1982-07-09

Publications (2)

Publication Number Publication Date
EP0070002A1 true EP0070002A1 (fr) 1983-01-19
EP0070002B1 EP0070002B1 (fr) 1985-10-16

Family

ID=6136470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106144A Expired EP0070002B1 (fr) 1981-07-09 1982-07-09 Appareil à jet, en particulier pour le traitement par jet d'abrasif à air comprimé

Country Status (3)

Country Link
EP (1) EP0070002B1 (fr)
AT (1) ATE16083T1 (fr)
DE (2) DE3127074A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003011524A1 (fr) * 2001-07-31 2003-02-13 Flow International Corporation Buse a jet de fluide haute pression et a segments multiples et procede de fabrication associe
DE102018101520A1 (de) * 2018-01-24 2019-07-25 Karlsruher Institut für Technologie Zweistoffdüse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1272662A (fr) * 1985-03-26 1990-08-14 Canon Kabushiki Kaisha Methode et dispositif de controle du debit de fines particules
FR2579487B1 (fr) * 1985-03-26 1989-05-12 Canon Kk Appareil pour reguler l'ecoulement de particules fines

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH131161A (de) * 1927-02-24 1929-01-31 Rhein Ruhr Maschinenvertrieb D Düse für Sandstrahlgebläse.
DE698841C (de) * 1939-01-01 1940-11-18 Fritz Seibel Mit Hartfutter ausgestattete, aus Ringteilen bestehende Strahlduese
US2583726A (en) * 1948-01-26 1952-01-29 Chalom Joseph Aaron Nozzle
GB722464A (en) * 1952-08-11 1955-01-26 William Howard Mead Abrasive blasting nozzle
DE2843013A1 (de) * 1978-10-03 1980-04-10 Peiniger Ernst Gmbh Strahlgeraet fuer das druckluftstrahlen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2052156A1 (fr) * 1970-10-23 1972-04-27

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH131161A (de) * 1927-02-24 1929-01-31 Rhein Ruhr Maschinenvertrieb D Düse für Sandstrahlgebläse.
DE698841C (de) * 1939-01-01 1940-11-18 Fritz Seibel Mit Hartfutter ausgestattete, aus Ringteilen bestehende Strahlduese
US2583726A (en) * 1948-01-26 1952-01-29 Chalom Joseph Aaron Nozzle
GB722464A (en) * 1952-08-11 1955-01-26 William Howard Mead Abrasive blasting nozzle
DE2843013A1 (de) * 1978-10-03 1980-04-10 Peiniger Ernst Gmbh Strahlgeraet fuer das druckluftstrahlen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003011524A1 (fr) * 2001-07-31 2003-02-13 Flow International Corporation Buse a jet de fluide haute pression et a segments multiples et procede de fabrication associe
US6851627B2 (en) 2001-07-31 2005-02-08 Flow International Corporation Multiple segment high pressure fluidjet nozzle and method of making the nozzle
DE102018101520A1 (de) * 2018-01-24 2019-07-25 Karlsruher Institut für Technologie Zweistoffdüse

Also Published As

Publication number Publication date
ATE16083T1 (de) 1985-11-15
DE3266927D1 (en) 1985-11-21
DE3127074A1 (de) 1983-01-27
EP0070002B1 (fr) 1985-10-16

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