EP2308646A1 - Procédé de traitement de pièces usinées à l'aide d'un jet d'eau contenant un agent abrasif sortant d'une buse sous haute pression, installation de jet d'eau destiné à exécuter et à appliquer le procédé - Google Patents
Procédé de traitement de pièces usinées à l'aide d'un jet d'eau contenant un agent abrasif sortant d'une buse sous haute pression, installation de jet d'eau destiné à exécuter et à appliquer le procédé Download PDFInfo
- Publication number
- EP2308646A1 EP2308646A1 EP10180557A EP10180557A EP2308646A1 EP 2308646 A1 EP2308646 A1 EP 2308646A1 EP 10180557 A EP10180557 A EP 10180557A EP 10180557 A EP10180557 A EP 10180557A EP 2308646 A1 EP2308646 A1 EP 2308646A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- abrasive
- water jet
- pressure
- pump
- valve
- 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
Links
Images
Classifications
-
- 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
- B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/023—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms double acting plate-like flexible member
Definitions
- the present invention relates to the field of machining work pieces by means of water jets. It relates to a method for processing, in particular cleaning, of a workpiece by means of a high-pressure emerging from a nozzle, abrasive-containing water jet according to the preamble of claim 1, and a water jet system for implementation of the procedure. Moreover, the invention relates to a method for using the inventive water jet method.
- Components of power plants are subject during their operation of a high mechanical and thermal stress. This is particularly true for the hot gas flow exposed components of gas turbines whose surfaces in addition to the extreme mechanical and thermal stresses also unwanted thermal and chemical reactions to form non-metallic layers, such as scale or corrosion coatings, are exposed with negative effects on performance. This requires regular maintenance intervals to check the condition of these components and their removal and / or cleaning, repair or replacement if necessary.
- Sandblasting is one of the known and established methods in the field. Air compressed to a pressure of several bars, to which an abrasive is added, is directed to the surface to be treated. The particles of the abrasive which impinge on the surface with high energy cause a cleaning effect. Disadvantages of these methods, however, are inaccurate control and in a relatively coarse material removal with adverse changes in the surface quality of the workpiece.
- Another type of cleaning method is based on the high-pressure water jet technique, with pure or added with an abrasive water jets are applied to the surface to be cleaned.
- the high pressure water jet technique uses water pressures of up to 600 MPa to produce a high velocity water jet.
- Such a high velocity water jet can be used as an omnidirectional tool for cutting or cleaning applications.
- Simplified illustrated first principle 10 water is supplied via a water supply line 11 of a pressure pump 12 in a water jet system and pumped at high pressure into a pressure line 13, which leads to a suitable nozzle 14.
- the high pressure water in the pressure line 13 then exits the nozzle 14 as necessary to form a high energy water jet.
- soft materials such as fabrics, leather, solidified foams, food, etc. can be cut.
- Typical parameters for pure water jet cleaning are working pressures of up to 300 MPa and volume flow rates of about 30 liters / min, resulting in high energy consumption (up to 150 kW). Corresponding high pressure pumps are also very expensive.
- the ASWJ (abrasive suspension water jets) produced according to the third principle are generally used for mobile and special applications.
- the advantages of the ASWJ beams compared to the AIWJ beams generated by the second principle are a higher efficiency (up to a factor of 4-5 higher) and the ability to use these beams in all layers and environments.
- a water jet installation 30 water is again supplied via a water feed line 11 to a pressure pump 12 and pumped at high pressure (up to 200 MPa) into a pressure line 13 which leads to a suitable nozzle 14.
- the water flow is split.
- a part flows via a first throttle valve 27 and a mixing piece 28 directly to the nozzle 14.
- a second, smaller part flows in a bypass line 23 via a second throttle valve 22 in a filled with abrasive and after removal of a dummy plug 25 refillable pressure tank 24 and from there via a shut-off valve 26 to the mixing piece 28. While the water flows through the pressure tank 24, it entrains the abrasive particles with.
- the resulting water / abrasive mixture is then placed in the mixing section 28 in the main water stream given.
- the throttle valves 22 and 27 the proportion of abrasive in the emerging from the nozzle 14 abrasive-containing water jet 29 can be controlled.
- Such a system is for example in the document DE-A1-199 09 377 described.
- the invention has for its object to provide such a method and such a system, which are the requirements of an application for power plants, such as turbines, grown.
- This field of application requires effective use in confined spaces, such as in narrow gaps, and also places high demands on the surface finish after machining.
- Essential to the invention is that in a first step at normal pressure an abrasive and water-containing abrasive suspension is provided, that in a second step, the provided abrasive suspension is brought to a working pressure above normal pressure, and that in a third step from under the working pressure standing abrasive suspension by means of a nozzle abrasive containing water jet is generated.
- a mixture with water and the abrasive is prepared in an open mixing container to provide the abrasive suspension under normal pressure in an open mixing container. This ensures that the suspension in the mixing container can be added at any time without difficulty.
- the mixture is kept in motion in the mixing container continuously, in particular by means of an agitator.
- Another embodiment of the inventive method is characterized in that a working pressure of several MPa, in particular from about 15 MPa to 25 MPa, is used.
- the comparatively low working pressure allows the use of less expensive components (eg pumps) and reduces energy consumption.
- An outstanding advantage of the invention is also that the low working pressure allows the use of small dimensioned and flexible components of the water jet system, such as pressure lines and cleaning heads, whereby it is now possible with the help of the invention, even difficult to access surfaces effectively to treat. As a result, it is possible in certain cases to dispense with the elaborate removal of the workpieces to be cleaned. Especially in power plant construction, this represents an advantage that should not be underestimated, leading to considerable cost savings for the power plant operator.
- an abrasive having a hardness of at least 7 according to the Mohs scale is added to the water.
- the abrasive particles have a diameter in the range of 0.1 mm to 0.3 mm.
- the abrasive suspension is preferably brought to the working pressure by means of a pump and the abrasive suspension brought to working pressure is conducted via a pressure line from the outlet of the pump directly to the nozzle, wherein a diaphragm pump is used in particular as a pump.
- An embodiment of the water jet system according to the invention is characterized in that the pump is a diaphragm pump, that the diaphragm pump has a pump chamber limited by a diaphragm, which communicates via an inlet valve with the suction line and an outlet valve with the pressure line, and that the valves respectively a valve sleeve forming a central valve passage, which is closed at the downstream end by a valve member seated, against the flow direction resiliently biased closing element.
- the use of a diaphragm pump has the advantage of low wear compared to other pump types, such as piston pumps.
- valve bushing and the closing element of the valves are made of a hard metal, in particular tungsten carbide, and that the valve seats are ground.
- the closing element in the area corresponding to the valve seat is spherical and biased by a compression spring in the closing direction.
- Another embodiment of the system according to the invention is characterized in that a pressure relief valve is arranged in the pressure line.
- the mixing container has an agitator equipped with a motor and is designed as an open container.
- the inventive method is advantageously used for cutting and / or cleaning tasks in power plant components, especially boilers, heat exchangers and turbines.
- Fig. 4 is the simplified scheme of working with abrasive suspension water jet system according to an embodiment of the invention reproduced.
- the water jet system 40 comprises a mixing vessel 31, a diaphragm pump 36 connected on the input side to the mixing vessel 31 via a suction line 35 and a nozzle 44 connected to the outlet of the membrane pump 36 via a pressure line 39.
- an abrasive suspension 34 is mixed under normal pressure and kept ready.
- an agitator 33 is provided which is driven by a motor 32.
- the mixing container 31 may be open at the top so that the components of the abrasive suspension can be replenished as needed and without interrupting the operation.
- Working under normal pressure greatly facilitates the controlled addition of water and abrasive into the mixing vessel 31 to maintain a constant mixing ratio.
- Variants of a automated loading of the mixing container 31 are preferred and can be implemented with comparatively simple technical means. Thus, a continuous operation of the water jet system is guaranteed with little equipment.
- the diaphragm pump 36 which has a pump chamber 38 limited by a diaphragm 37, sucks in an intake stroke (movement to the left in FIG Fig. 4 ) via an inlet valve 41 from the mixing container 31 suspension and pushes them in a working stroke (movement to the right in Fig. 4
- the suspension flows via the pressure line 39 (in which a pressure relief valve is arranged to prevent damage to the pump 36 by overpressure) directly to the nozzle 44 consisting of hard metal (tungsten carbide).
- a abrasive-containing water jet 45 is formed, which can be punctiform, spread or otherwise shaped depending on the requirement of the application.
- the pressure in the pressure line 39 may be higher than that of pure water ( Fig. 1 ) from 200 MPa to 15 MPa to 25 MPa, preferably 20 MPa, without impairing the cleaning effect.
- This allows the use of small dimensioned pressure lines in the form of hoses with diameters below 12 mm.
- Such hoses have a high flexibility (bending radius less than 50 mm) and are therefore also suitable for use in tight space conditions, as prevail, for example, within the blading of turbines.
- a diaphragm pump 36 is used instead of a conventional piston pump whose structure and function, for example, in the document US B2-6,899,530 is described. These pumps are commonly used to pump corrosive and abrasive media, but at comparatively low pressures. In the present application, the sucked with such a pump Suspension brought to pressures of about 15 MPa to 25 MPa. An operation at these pressures is achieved in that the inlet and outlet valves 41, 42, which are subject to a special wear, according FIGS. 5 and 6 have been modified.
- Diaphragm pumps are volumetric pumps that generate pressure by mechanical displacement of synthetic membranes. To achieve constant pressure and flow, each pump chamber (38 in Fig. 4 ) with two valves (41, 42 in Fig. 4 ) fitted. A pump usually contains three to five such pump chambers. Due to the high flow rate of the abrasive suspension when opening the valves, these are mainly exposed to wear (the erosion is very much dependent on the speed of the eroding particles).
- the valve 42 'of Fig. 5 includes an (annular) valve sleeve 46 defining a central valve passage 50.
- a disc-shaped closing element 48 ' is pressed by means of a compression spring 49 against a valve seat 47' at the downstream end of the valve sleeve 46 and thus closes the valve passage 50 and thus the adjacent pump chamber.
- valve 42 ' A major problem with the valve 42 'is that if the valve does not close or does not close properly, high local flow velocities will occur at the location of the leakage and the closure member 48' and valve sleeve 46 will erode very severely. Even tungsten carbide valves are eroded in less than half an hour.
- the reason for the lack of tightness in such standard valves is the lack of centering of the disk-shaped closing element 48 'in the valve sleeve 46:
- the closing element 48' has no due to the (flat) shape of the standard closing element 48 '(ground radius of the valve seat 47'), there are some areas where there is no surface contact between the closing element 48 'and the valve seat 47' when the closing element 48 'is not is perfectly centered.
- valve geometry is according to Fig. 6 been changed.
- the closing element 48 of the valve 42 now has the shape of a ball or a spherical section. This has the consequence that, even if the closing element 48 is not perfectly centered, 47 surface contact still prevails over the entire circumference of the valve seat and the tightness is ensured. At the same time, the contact surface on the valve seat 47 has been considerably enlarged. In addition, all sealing surfaces are ground to achieve a good seal.
- As the material for the closing element 48 and the valve sleeve 46 tungsten carbide is used. It has been proven that the necessary maintenance intervals can be considerably extended by these measures. Intervals of 50 hours and more have proven to be sufficient.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Cleaning By Liquid Or Steam (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009043697A DE102009043697A1 (de) | 2009-10-01 | 2009-10-01 | Verfahren zum Bearbeiten von Werkstücken mittels eines unter hohem Druck aus einer Düse austretenden schleifmittelhaltigen Wasserstrahls, Wasserstrahlanlage zur Durchführung des Verfahrens sowie Anwendung des Verfahrens |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2308646A1 true EP2308646A1 (fr) | 2011-04-13 |
EP2308646B1 EP2308646B1 (fr) | 2014-02-26 |
Family
ID=43618100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10180557.0A Not-in-force EP2308646B1 (fr) | 2009-10-01 | 2010-09-28 | Procédé de traitement de pièces usinées à l'aide d'un jet d'eau contenant un agent abrasif sortant d'une buse sous haute pression, installation de jet d'eau destiné à exécuter et à appliquer le procédé |
Country Status (4)
Country | Link |
---|---|
US (1) | US8602844B2 (fr) |
EP (1) | EP2308646B1 (fr) |
DE (1) | DE102009043697A1 (fr) |
MY (1) | MY155526A (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019133827A1 (de) | 2018-12-18 | 2020-06-18 | Technische Universität Chemnitz | Vorrichtung und Verfahren zum Schalten einer Hochdruck-Suspension |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130084190A1 (en) * | 2011-09-30 | 2013-04-04 | General Electric Company | Titanium aluminide articles with improved surface finish and methods for their manufacture |
US10155298B2 (en) * | 2011-12-21 | 2018-12-18 | Sikorsky Aircraft Corporation | Alpha case removal process for a main rotor blade spar |
US9011205B2 (en) * | 2012-02-15 | 2015-04-21 | General Electric Company | Titanium aluminide article with improved surface finish |
US11260503B2 (en) * | 2013-12-20 | 2022-03-01 | Flow International Corporation | Abrasive slurry delivery systems and methods |
JP7097384B2 (ja) * | 2017-03-31 | 2022-07-07 | エーエヌティー アプライド ニュー テクノロジーズ エージー | ウォータアブレイシブサスペンションジェット式切断装置およびウォータアブレイシブサスペンションジェット式切断方法 |
CN108655960A (zh) * | 2018-04-10 | 2018-10-16 | 西安蓝想新材料科技有限公司 | 双高压混合清洗设备 |
CN109664204A (zh) * | 2019-01-02 | 2019-04-23 | 中国矿业大学 | 一种超高压前混合磨料射流智能连续供料系统 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2073630A (en) * | 1980-04-12 | 1981-10-21 | Ogle & Sons Ltd G C | Sand-blasting equipment |
DE3121103A1 (de) * | 1980-05-31 | 1982-02-11 | Otto Tuchenhagen GmbH & Co KG, 2059 Büchen | "membranpumpe" |
US4408626A (en) * | 1980-10-08 | 1983-10-11 | Tlv Co., Ltd. | Valve seat assembly for a steam trap |
US4854090A (en) * | 1985-10-10 | 1989-08-08 | The British Hydromechanics Research Association | Feeding abrasive material |
US4872293A (en) * | 1986-02-20 | 1989-10-10 | Kawasaki Jukogyo Kabushiki Kaisha | Abrasive water jet cutting apparatus |
US5160548A (en) * | 1991-09-09 | 1992-11-03 | Ohmstede Mechanical Services, Inc. | Method for cleaning tube bundles using a slurry |
WO1997031752A1 (fr) * | 1996-03-01 | 1997-09-04 | Extrude Hone Corporation | Polissage par jet de fluide abrasif |
WO2008001111A1 (fr) * | 2006-06-29 | 2008-01-03 | Bhr Group Limited | Appareil de découpage au jet d'eau |
Family Cites Families (14)
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US2984188A (en) * | 1958-10-10 | 1961-05-16 | Walbro Corp | Bladder fuel pump |
US4818191A (en) * | 1982-03-31 | 1989-04-04 | Neyra Industries, Inc. | Double-acting diaphragm pump system |
GB2170128B (en) * | 1985-01-16 | 1988-11-16 | Fluid Eng Prod | Apparatus for generating an abrasive fluid jet |
US4669230A (en) * | 1986-01-03 | 1987-06-02 | Fuji Seiki Machine Works, Ltd. | Wet blasting machine with automatic control system for slurry concentration |
DE29612046U1 (de) * | 1996-07-11 | 1996-09-12 | Otto Christ GmbH & Co., 87734 Benningen | Vorrichtung zum Reinigen von verschmutzten Oberflächen |
DE19909377C2 (de) | 1999-03-04 | 2002-03-21 | Kurt Hoerger | Verfahren und Vorrichtung zum Schneiden und Abtragen von Hindernissen und Ablagerungen in nichtbegehbaren und begehbaren Rohren oder Kanälen |
DE19910563A1 (de) * | 1999-03-10 | 2000-09-14 | Torbo Engineering Keizers Gmbh | Reinigungsgerät und -Verfahren |
US6899530B2 (en) | 2002-10-31 | 2005-05-31 | Wanner Engineering, Inc. | Diaphragm pump with a transfer chamber vent with a longitudinal notch on the piston cylinder |
US7040962B2 (en) * | 2003-11-19 | 2006-05-09 | Fuji Seiki Machine Works, Ltd. | Ice blasting apparatus and trimming method for film insert molding |
WO2005051598A1 (fr) | 2003-11-19 | 2005-06-09 | Donald Stuart Miller | Entrainement d'abrasif |
KR100709587B1 (ko) * | 2004-11-11 | 2007-04-20 | 가부시끼가이샤 후지세이사쿠쇼 | 연마재 및 동 연마재의 제조 방법, 및 상기 연마재를이용한 블라스트 가공 방법 |
US7749049B2 (en) * | 2006-05-25 | 2010-07-06 | Lightmachinery Inc. | Submerged fluid jet polishing |
US7455573B2 (en) * | 2006-09-06 | 2008-11-25 | Lightmachinery Inc. | Fluid jet polishing with constant pressure pump |
US8257147B2 (en) * | 2008-03-10 | 2012-09-04 | Regency Technologies, Llc | Method and apparatus for jet-assisted drilling or cutting |
-
2009
- 2009-10-01 DE DE102009043697A patent/DE102009043697A1/de not_active Withdrawn
-
2010
- 2010-09-28 US US12/891,946 patent/US8602844B2/en not_active Expired - Fee Related
- 2010-09-28 EP EP10180557.0A patent/EP2308646B1/fr not_active Not-in-force
- 2010-09-30 MY MYPI2010004602A patent/MY155526A/en unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2073630A (en) * | 1980-04-12 | 1981-10-21 | Ogle & Sons Ltd G C | Sand-blasting equipment |
DE3121103A1 (de) * | 1980-05-31 | 1982-02-11 | Otto Tuchenhagen GmbH & Co KG, 2059 Büchen | "membranpumpe" |
US4408626A (en) * | 1980-10-08 | 1983-10-11 | Tlv Co., Ltd. | Valve seat assembly for a steam trap |
US4854090A (en) * | 1985-10-10 | 1989-08-08 | The British Hydromechanics Research Association | Feeding abrasive material |
US4872293A (en) * | 1986-02-20 | 1989-10-10 | Kawasaki Jukogyo Kabushiki Kaisha | Abrasive water jet cutting apparatus |
US5160548A (en) * | 1991-09-09 | 1992-11-03 | Ohmstede Mechanical Services, Inc. | Method for cleaning tube bundles using a slurry |
WO1997031752A1 (fr) * | 1996-03-01 | 1997-09-04 | Extrude Hone Corporation | Polissage par jet de fluide abrasif |
WO2008001111A1 (fr) * | 2006-06-29 | 2008-01-03 | Bhr Group Limited | Appareil de découpage au jet d'eau |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019133827A1 (de) | 2018-12-18 | 2020-06-18 | Technische Universität Chemnitz | Vorrichtung und Verfahren zum Schalten einer Hochdruck-Suspension |
WO2020125860A1 (fr) | 2018-12-18 | 2020-06-25 | Technische Universität Chemnitz | Dispositif et procédé de commutation d'une suspension à pression élevée |
Also Published As
Publication number | Publication date |
---|---|
EP2308646B1 (fr) | 2014-02-26 |
AU2010224471A1 (en) | 2011-04-21 |
US20110081834A1 (en) | 2011-04-07 |
AU2010224471B2 (en) | 2016-03-17 |
MY155526A (en) | 2015-10-30 |
US8602844B2 (en) | 2013-12-10 |
DE102009043697A1 (de) | 2011-04-07 |
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