EP1395097A2 - Dispositif de coupage par plasma - Google Patents

Dispositif de coupage par plasma Download PDF

Info

Publication number
EP1395097A2
EP1395097A2 EP03018298A EP03018298A EP1395097A2 EP 1395097 A2 EP1395097 A2 EP 1395097A2 EP 03018298 A EP03018298 A EP 03018298A EP 03018298 A EP03018298 A EP 03018298A EP 1395097 A2 EP1395097 A2 EP 1395097A2
Authority
EP
European Patent Office
Prior art keywords
sleeve
opening
nozzle
protrusion
external
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
EP03018298A
Other languages
German (de)
English (en)
Other versions
EP1395097B1 (fr
EP1395097A3 (fr
Inventor
Giorgio c/o TEC. MO S.R.L. Bassi
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.)
Tecmo SRL
Original Assignee
Tecmo SRL
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 Tecmo SRL filed Critical Tecmo SRL
Publication of EP1395097A2 publication Critical patent/EP1395097A2/fr
Publication of EP1395097A3 publication Critical patent/EP1395097A3/fr
Application granted granted Critical
Publication of EP1395097B1 publication Critical patent/EP1395097B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3484—Convergent-divergent nozzles

Definitions

  • the present invention relates to the technical field concerning the plasma jet devices and it refers to a torch device for plasma cutting, manually or mechanically operated.
  • the nozzle is sometimes cooled by air flowing trough an interspace delimited by a sleeve, external to the nozzle, and by the latter.
  • the main drawback of said known devices consists in that the cooling air, coming out from the interspace, interferes with the plasma reducing the cutting efficiency thereof.
  • An object of the present invention is to propose a device for plasma cutting having a very good cooling also of the end portions of nozzle and of sleeve and fit to produce a not disturbed plasma jet and thus very efficient.
  • Another object is to propose a torch having high reliability and a long life nozzle.
  • numeral 1 designates the device for plasma cutting, of pneumatic or electric high frequency arc striking or equivalents of the present invention and particularly fit for robotized arms and generally for automatic plasma cutting systems.
  • the device 1 is provided with an external sleeve 2 for a hollow nozzle 3 containing an electrode and provided with an exit 4 from whose external outlet 9 the plasma jet 30, provided for cutting, comes out.
  • a tubular wall shaped cavity 5 separates the external sleeve 2 from the nozzle 3 guaranteeing the mutual isolation.
  • the cavity 5 is flowed by a cooling fluid F for the nozzle 3 and for the sleeve 2, consisting of compressed air produced by an external compressor and flowed in the cavity 5 by means of known and not shown ducts.
  • the fluid F flows outside the device 1 through an opening 6 and a plurality of holes 15 of the external sleeve 2.
  • the nozzle 3 has a protrusion 7, nearly coaxial to the said nozzle, in which the exit 4 for the plasma is carried out.
  • Said protrusion is approximately truncated cone shaped with a side wall 8 divergent in direction of the external outlet 9 of the exit 4 to deflect the cooling fluid F in direction of leaving from the plasma jet 30 in order to avoid disturbing, or perturbing, this latter.
  • the length, or the axial extension, of the protrusion 7 is proportional to the value of the feeding electric current of the plasma jet 30 of the device 1.
  • the maximum diameter of the protrusion 7 is smaller than that of the remaining cylindrical part of the nozzle 3 and it is smaller than the minimum diameter of the opening 6.
  • the protrusion 7 is housed in the opening 6 of the external sleeve 2.
  • Said opening 6 has an inner wall 10 having a first portion 11 approximately conical shaped and facing the side wall 8 of the protrusion 7.
  • the first portion 11 of the opening 6 is divergent toward the outside of the sleeve 2 and defines an angle B equal to the angle A, defined by the side wall 8 of the protrusion 7.
  • the invention also provides that the angle B of the inner wall 10 is greater than the angle A of protrusion 7 to realize a divergent tubular duct with sections for the passage of the cooling fluid F that increase very quickly toward the outside of the device 1.
  • angles A and B of the protrusion 7 and of the first portion 11 of opening 6 range between 4° and 120°, and preferably they have respective values of around 14° - 20°.
  • the nozzle 3 and the sleeve 2 Upstream the opening 6, in comparison to the fluid F flow , the nozzle 3 and the sleeve 2 have respective linking walls 13, 14 side by side arranged and approximately conical shaped convergent toward the opening 6 and fit to join the side wall 8 of the protrusion 7 and the inner wall 10 of the opening 6 with the portion of the cavity 5 corresponding to the cylindrical portion of the nozzle 3.
  • the holes 15 have axis that are parallel to the axis of the exit 4 of the nozzle 3, and they flow inside the device into an annular groove 16, carried out in the inner wall of the sleeve 2 upstream the opening 6; the annular groove 16 has a cylindrically shaped wall 17 for narrowing the cavity 5.
  • deflector means 18 consisting of an external portion 19, nearly conic and divergent, of the sleeve 2 fit to deflect the fluid flow coming out from said holes 15 in a direction away from the plasma jet 30.
  • the sleeve 2 is detachably fixed to the device 1 by dap joint means or threaded means 20.
  • the operation of the device 1 provides that the plasma 30 coming out from the device forms a jet almost rectilinear and unperturbed thanks to the radial deflection toward the outside of the cooling fluid F, performed by the divergent conicity of the side wall 8 of the protrusion 7, of the inner wall 10 of the opening 6 and by the deflector means 18. Said radial deflection allows to increase the total flow of the cooling fluid F advantageously ensuring a better cooling of the nozzle 3 and of the sleeve 2.
  • the variant of the sleeve 2 of figures 5 to 7 is particularly suitable for manually operated devices.
  • the inner wall 10 of the opening 6 of said variant has a second portion 12, externally located with respect to the first portion 11 and similarly having a truncate cone shape defining an angle C bigger than the angle B of the first portion 11.
  • the external edge of the sleeve 2, at the second portion 12 of the opening 6, has a plurality of recesses 23 for the passage of fluid F coming from the opening 6, in a contact condition of the sleeve 2 with the piece to be cut.
  • the angle C of the second portion 12 of the opening 6 ranges between 40° and 160°, preferably 60°.
  • the conic linking wall 13 of the nozzle 3 and the side wall 8 of the protrusion 7 have respective pluralities of grooves 35, 36 arranged according to the straight generating lines of the respective cones.
  • Said grooves 35, 36 increase the thermal exchange between the portion of the nozzle 3 next to the exit of the plasma 30 and the cooling fluid F providing an advantageous reduction of the temperature for increasing the life of the nozzle 3.
  • the grooves 35, 36 can be tilted, in concordant directions, to obtain a further improvement of cooling.
  • the angle B of first portion 11 of the opening 6 of the sleeve 2 is greater than the angle A of protrusion 7 of the nozzle 3.
  • Such angle A of protrusion 7 ranges between 4° and 26°, preferably 16°
  • said angle B of first portion 11 of the opening 6 ranges between 10° and 30°, preferably 20°.
  • the present invention further provides that the sleeve 2 and the nozzle 3 could be elongated and that the axial length/maximum diameter ratio of each of them could be up to about 3 or 4. More precisely, said ratio of the sleeve 2 could range from 0,6 to 2,5 and the ratio of the nozzle 3 could range from 1 to 4.
  • the axial length/maximum diameter ratio of the sleeve 2 is about 1 - 1,5 and that the ratio of the nozzle 3 is about 2.
  • the electrode could be elongated accordingly to the nozzle length.
  • the main advantage of the present invention is to provide a device for plasma cutting having a very good cooling also of the end portions of the nozzle and the sleeve also and fit for producing an unperturbed plasma jet and therefore very efficient.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Arc Welding In General (AREA)
  • Plasma Technology (AREA)
EP03018298A 2002-08-30 2003-08-12 Dispositif de coupage par plasma Expired - Lifetime EP1395097B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO20020553 2002-08-30
IT000553A ITBO20020553A1 (it) 2002-08-30 2002-08-30 Dispositivo di taglio al plasma.

Publications (3)

Publication Number Publication Date
EP1395097A2 true EP1395097A2 (fr) 2004-03-03
EP1395097A3 EP1395097A3 (fr) 2006-10-25
EP1395097B1 EP1395097B1 (fr) 2009-01-14

Family

ID=31198606

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03018298A Expired - Lifetime EP1395097B1 (fr) 2002-08-30 2003-08-12 Dispositif de coupage par plasma

Country Status (3)

Country Link
EP (1) EP1395097B1 (fr)
DE (1) DE60325813D1 (fr)
IT (1) ITBO20020553A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7598473B2 (en) 2005-05-11 2009-10-06 Hypertherm, Inc. Generating discrete gas jets in plasma arc torch applications
US8097828B2 (en) 2006-05-11 2012-01-17 Hypertherm, Inc. Dielectric devices for a plasma arc torch

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029930A (en) * 1972-09-04 1977-06-14 Mitsubishi Jukogyo Kabushiki Kaisha Welding torch for underwater welding
US4816637A (en) * 1985-11-25 1989-03-28 Hypertherm, Inc. Underwater and above-water plasma arc cutting torch and method
WO1991002619A1 (fr) * 1989-08-17 1991-03-07 Hypertherm, Inc. Appareil de coupage au jet de plasma muni d'un ecran pour le diffuseur et d'un regulateur de flux ameliores
EP0444346A2 (fr) * 1990-02-28 1991-09-04 ESAB Welding Products, Inc. Torche à arc de plasma à buse allongée
EP0735805A1 (fr) * 1993-12-17 1996-10-02 Adamas At Ag Pistolet plasma a arc electrique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029930A (en) * 1972-09-04 1977-06-14 Mitsubishi Jukogyo Kabushiki Kaisha Welding torch for underwater welding
US4816637A (en) * 1985-11-25 1989-03-28 Hypertherm, Inc. Underwater and above-water plasma arc cutting torch and method
WO1991002619A1 (fr) * 1989-08-17 1991-03-07 Hypertherm, Inc. Appareil de coupage au jet de plasma muni d'un ecran pour le diffuseur et d'un regulateur de flux ameliores
EP0444346A2 (fr) * 1990-02-28 1991-09-04 ESAB Welding Products, Inc. Torche à arc de plasma à buse allongée
EP0735805A1 (fr) * 1993-12-17 1996-10-02 Adamas At Ag Pistolet plasma a arc electrique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7598473B2 (en) 2005-05-11 2009-10-06 Hypertherm, Inc. Generating discrete gas jets in plasma arc torch applications
CN101176387B (zh) * 2005-05-11 2012-11-21 人工发热机有限公司 在等离子体弧气炬的应用中不连续气体喷射流的产生
US8097828B2 (en) 2006-05-11 2012-01-17 Hypertherm, Inc. Dielectric devices for a plasma arc torch

Also Published As

Publication number Publication date
ITBO20020553A1 (it) 2004-02-29
EP1395097B1 (fr) 2009-01-14
DE60325813D1 (de) 2009-03-05
EP1395097A3 (fr) 2006-10-25

Similar Documents

Publication Publication Date Title
US9398679B2 (en) Air cooled plasma torch and components thereof
KR100199782B1 (ko) 물분사 노즐 조립체를 가진 플라즈마 아크토치
EP2689640B1 (fr) Torche à plasma
CA1234689A (fr) Pistolet au plasma
EP2011375B1 (fr) Torche à plasma d'arc à haute visibilité
CN101220964B (zh) 套环、套筒以及冷却燃烧器组件的方法
KR101793314B1 (ko) 개선된 열전달과 신규한 조립 방법을 가진 플라즈마 토치용 전극
CN101204123B (zh) 提供斜角屏蔽流喷射的等离子体弧气炬
US4505639A (en) Axial-flow turbine blade, especially axial-flow turbine rotor blade for gas turbine engines
US20060102598A1 (en) Plasma arc torch having an electrode with internal passages
US9210787B2 (en) Hybrid shield device for a plasma arc torch
US20150334818A1 (en) Air cooled plasma torch and components thereof
US10589373B2 (en) Vented plasma cutting electrode and torch using the same
KR0136576B1 (ko) 이행식 플라즈마 아크 토치
CA2361818A1 (fr) Debit de gaz ameliore pour chalumeau a arc de plasma
CA2109772C (fr) Tete de coupe pour chalumeau a flamme d'oxygene et gaz post-melangee
CA2366806A1 (fr) Ensemble de soufflage de suie comportant une tuyere en aval amelioree
US6277323B1 (en) Cutting nozzle assembly for a postmixed oxy-fuel gas torch
EP1395097B1 (fr) Dispositif de coupage par plasma
US9560733B2 (en) Nozzle throat for thermal processing and torch equipment
US20070025862A1 (en) Compressible gas ejector with unexpanded motive gas-load gas interface
US8753111B2 (en) Swirl combustion air fuel torch
CN211387312U (zh) 水冷等离子割枪
CA2546862A1 (fr) Ensemble de buses pour souffleur de suie muni de buses ayant des formes geometriques differentes
CN106465528B (zh) 经改进的空气冷却式等离子炬及其部件

Legal Events

Date Code Title Description
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

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK

17P Request for examination filed

Effective date: 20070425

AKX Designation fees paid

Designated state(s): DE ES FR GB IT

17Q First examination report despatched

Effective date: 20070628

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 60325813

Country of ref document: DE

Date of ref document: 20090305

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090425

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20091015

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100812

PGRI Patent reinstated in contracting state [announced from national office to epo]

Ref country code: IT

Effective date: 20110616

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20110812

Year of fee payment: 9

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 60325813

Country of ref document: DE

Representative=s name: HAUCK PATENT- UND RECHTSANWAELTE, DE

Ref country code: DE

Ref legal event code: R082

Ref document number: 60325813

Country of ref document: DE

Representative=s name: HAUCK PATENTANWALTSPARTNERSCHAFT MBB, DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20120812

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120812

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20130814

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20130731

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20131009

Year of fee payment: 11

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 60325813

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140812

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 60325813

Country of ref document: DE

Effective date: 20150303

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20150430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150303

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140901