EP0515449B1 - Device for cutting and cleaning objects using a water/abrasive mixture at high pressure - Google Patents

Device for cutting and cleaning objects using a water/abrasive mixture at high pressure Download PDF

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Publication number
EP0515449B1
EP0515449B1 EP91903878A EP91903878A EP0515449B1 EP 0515449 B1 EP0515449 B1 EP 0515449B1 EP 91903878 A EP91903878 A EP 91903878A EP 91903878 A EP91903878 A EP 91903878A EP 0515449 B1 EP0515449 B1 EP 0515449B1
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EP
European Patent Office
Prior art keywords
mixing chamber
jet
bore
chamber body
outlet
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Expired - Lifetime
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EP91903878A
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German (de)
French (fr)
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EP0515449A1 (en
Inventor
Hannes Domann
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GKSS Forshungszentrum Geesthacht GmbH
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GKSS Forshungszentrum Geesthacht GmbH
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    • 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 device for cutting and cleaning objects and for targeted material removal by means of a high-pressure water jet that crosses a mixing chamber from an inlet formed in a water inlet nozzle to an outlet, to which an abrasive in the mixing chamber is fed by being introduced into the water jet.
  • the mixing chamber is formed by a bore in a mixing chamber body which is axial to the inlet nozzle axis and which is delimited by the water inlet nozzle on the water inlet nozzle side.
  • Both the known device and other known devices of the same type are basically for one Optimized ambient pressure of 1 bar (atmospheric normal pressure).
  • work must be carried out under increased ambient pressure, which has the considerable disadvantage that the cutting, cleaning and removal performance of the device drops considerably, which is essentially due to the expansion of the water jet after it emerges from the water inlet nozzle, ie in the area of the mixture between water and abrasive.
  • an increase in the air mass conveyed was determined by the suction process of the abrasive, which also adversely affects the performance of the device.
  • the object is achieved according to the invention in that the bore of the mixing chamber and the water inlet nozzle are cylindrical and have the same diameter, the water inlet nozzle partially protruding into the bore of the mixing chamber.
  • the device according to the invention In contrast to known devices operating under normal pressure, in which the mixing chamber is of relatively large volume and is essentially formed by a housing body which encloses the mixing chamber inside, the device according to the invention only provides an axial bore for the water inlet nozzle axis, which acts as a mixing chamber defined diameter and defined axial length can be formed. Since the jet expansion of the water jet entering the mixing chamber increases in proportion to the ambient pressure, it is possible according to the invention with simple means, due to the resulting reflection behavior of the water jet jacket, to create an optimal inlet geometry over a defined pressure range that is directly matched to the prevailing pressure by simple means is adjusted, ie by predetermined axial length and / or predetermined diameter of the bore.
  • a major difficulty with devices of this type is that the high cutting performance of the device obtained in the manner described above, even at high ambient pressure, is not negated by the fact that performance losses due to manufacturing errors-related axis errors occur between the inlet nozzle axis and outlet nozzle axis or outlet axis in the mixing chamber body. Manufacturing errors and / or assembly errors can have a very considerable influence on the performance of the device if they accumulate, with the result that the performance drops significantly.
  • the water inlet nozzle stands at least partially into the mixing chamber.
  • the mixing chamber body is received in a body holder, which on one side with a connector for connection to a high pressure water source and on the other side is connected to a stop nut.
  • a body holder which on one side with a connector for connection to a high pressure water source and on the other side is connected to a stop nut.
  • connections by means of threaded connections which, on the one hand, enable an automatic axis adjustment between the connecting piece and thus the inlet nozzle on the one hand and on the other hand between the mixing chamber body and thus the outlet nozzle axis or the mixing chamber body axis.
  • threaded connections of this type can be loosened or fixed relatively quickly and thus without tools.
  • the actual outlet nozzle can be formed separately from mixing chamber bodies because of its special requirements regarding its hardness.
  • the water inlet nozzle as a separate part usually sits in the lower part of the connecting piece and is only clamped there between the connecting piece and the mixing chamber body, it can be advantageous that the essentially cylindrical mixing chamber body with lateral play in the substantially cylindrical trained bore of the body holder is added, so tolerances in To compensate for the seat of the water inlet nozzle in the connection piece without restricting the performance of the device, since it is essential to achieve an axial alignment between the inlet nozzle axis and the outlet nozzle axis.
  • Another advantage of a one-piece mixing chamber body with the outlet nozzle is the usually good correspondence between the axes of the mixing chamber bore and the outlet nozzle bore, which results from the manufacturing process. If the water nozzle is precisely fitted in the mixing chamber bore, this automatically results in an exact alignment of the water nozzle axis with the outlet nozzle axis.
  • the manufacturing tolerances of the body holder have no influence on the alignment of the axes.
  • a separate bushing device is accommodated in the stop nut, which has a bore for receiving an outlet nozzle separate from the mixing chamber body.
  • the mixing chamber body can be made from a material that is not as high-quality as the outlet nozzle as a simple cylindrical body, while the outlet nozzle is pressed against the mixing chamber body in axial alignment, end face to end face, by the stop nut, seated in the socket device.
  • the bore axis of the bore In order to be able to compensate for axis errors between the axis of the mixing chamber body and the axis of the outlet nozzle with a separate design, it is advantageous for the bore axis of the bore to be eccentric to the axis of the bushing device.
  • the stop nut is closed with a union nut provided with a through hole, the free end of the outlet nozzle projecting through the through hole and a stop ring between union nut and bushing device, which is firmly connected to the outlet nozzle.
  • the axial length of the mixing chamber is advantageously in the range between 2-4 mm.
  • the abrasive inlet is advantageously introduced through the mixing chamber body into the mixing chamber, so that the geometry of the mixing chamber designed as a bore in the mixing chamber body described above is essentially not disturbed.
  • the abrasive agent inlet is preferably tapered towards the actual mixing chamber, so that an abrasive agent inlet opening can be defined in the mixing chamber body with a defined size.
  • the abrasive agent tube has an external thread which engages in a corresponding internal thread formed in the mixing chamber body and / or in the body holder, so that abrasive agent tubes of different geometries can be used very quickly in a simple manner.
  • the mixing chamber is advantageously tapered in a funnel shape at its end facing the outlet for the water-abrasive mixture .
  • the outlet nozzle is under very high mechanical stress due to the high mechanical influences on it by the water-abrasive mixture.
  • the outlet nozzle is made of a suitable hard material.
  • it can also be sensible and therefore advantageous to likewise form the mixing chamber body from the same hard material if, for example, the mixing chamber body and the outlet nozzle are manufactured in one piece, in which case the increased material expenditure for the mixing chamber body takes a back seat compared to the production costs of separate mixing chamber bodies from a separate one Material.
  • an additional fluid addition device is advantageously provided in the outlet nozzle region.
  • This addition can take place vertically or at an acute angle in the jet direction to the outlet nozzle bore via one or more fluid channels or via an annular addition geometry.
  • this can preferably take place at the dividing point.
  • Different jet behavior can be achieved through the type of fluid and the fluid pressure.
  • the wet addition consisting of water and abrasive material can also be used in the device described here.
  • the pressure range in which the addition of the abrasive advantageously works can be between 1 and approx. 300 bar.
  • the device 10 consists essentially of a mixing chamber body 120 and a so-called connector 121, which is connected on a free side to a pressure line, not shown here, in a known manner.
  • the connecting piece 121 has an essentially central through hole through which the water brought in via the pressure line, not shown, passes according to the arrow 15.
  • a nozzle insert is provided which comprises, for example, the water inlet nozzle 17 made of a hard material such as sapphire or the like.
  • the nozzle insert is seated in a conical seat in the connecting piece 121 formed at the lower end, based on the figures Nozzle insert has a through hole which passes through it essentially centrally, the one end of the through hole which points towards the mixing chamber 12 forms an inlet 13 of the water or water jet 15 into the mixing chamber 12.
  • the mixing chamber body 120 is essentially rotationally symmetrical in the form of a cylinder.
  • the actual mixing chamber 12 is formed by a bore which is axial to the inlet nozzle axis 18 and which is delimited by the water inlet nozzle 17 on the water inlet nozzle side 19.
  • the water inlet nozzle 17 projects into the mixing chamber, the water inlet nozzle 17 being supported by a flange-like collar 170 on the upper boundary surface 123 of the mixing chamber body 120.
  • the axial length 122 of the mixing chamber 12 is in the range of 2-8 mm, preferably in the range of 2-4 mm, with chamber diameters of 2-8 mm being advantageous, for example.
  • the abrasive agent 160 is introduced in a known manner into the water jet 15 passing through the mixing chamber 12 from the inlet 13 to an outlet 14, which is formed here in the mixing chamber body 120.
  • the water inlet nozzle axis 18 and thus that of the water jet 15 must, in order to ensure optimal energy transmission of the water jet 15 to the abrasive 160, be aligned with high precision axially to the outlet nozzle axis 24 or to the mixing chamber body axis 124.
  • the mixing chamber body 120 is received in a body holder 25. This is connected on one side 250 to the connector 121 and on the other side 151 to a stop nut 32 via threaded connections 252, 253 formed there in each case.
  • the mixing chamber body 120 itself is essentially cylindrical.
  • the bore 254 passing through the body holder 25 is likewise essentially cylindrical and is dimensioned such that the mixing chamber body 120 is received in it with radial play.
  • the mixing chamber body 120 is formed in one piece with the outlet nozzle 21, namely in the extension of the outward extension of the mixing chamber body 120.
  • the stop nut 32 which has a recess 34 in its inner bore 33, includes holding the mixing chamber body 120, which is correspondingly tapered in diameter at this point.
  • the inner bore 33 has a larger diameter than the diameter of the outlet nozzle 21 formed as an extension in the mixing chamber body 120, the diameter being dimensioned such that the outlet nozzle 21 passes through the inner bore 33 with play.
  • a fluid channel 212 In the lower part of the outlet nozzle 21 there can be a fluid channel 212 or a plurality of fluid channels which run at right angles or at an acute angle (here at 45 °) to the outlet nozzle axis 24.
  • the fluid channels are connected via an annular gap 321 to a fluid addition connection 36.
  • a pair of sealing rings 320 realizes the pressure closure from the environment.
  • the mixing chamber body 120 is formed separately from the outlet nozzle 21.
  • a separate bushing device 28 is received in the stop nut 32 there.
  • the bushing device 28 has a bore 29 for the passage or for receiving the outlet nozzle 21.
  • the bore axis 30 of the bore 29 can be formed eccentrically to the bushing device axis 31, so that fault tolerances of all components of the device can be compensated in such a way that an axial alignment of the inlet nozzle axis 18, the mixing chamber body axis 124 and the outlet nozzle axis 24 is achieved and an axial error goes to zero .
  • the stop nut 32 has an external thread 35 at its outward end, on which a union nut 40 provided with a through hole 38 is seated.
  • the diameter of the through hole 38 is dimensioned such that the outlet nozzle 21 projects through the through hole 38 with play.
  • the outlet nozzle 21 is held in the bushing device 28 or in the stop ring 39 by means of the stop ring 39 and pressed with its one flat boundary surface 210 against the lower boundary surface 125 of the mixing chamber body 120 and fixed in this position.
  • the abrasive is conveyed into the mixing chamber 12 via an abrasive inlet 16.
  • the abrasive inlet 16 is formed by an abrasive tube 161 which can be inserted therein and which has an external thread 162.
  • the external thread 162 engages in a corresponding internal thread 225, which can be formed either in the mixing chamber body 120 and / or in the body holder 25.
  • the abrasive agent inlet 16 is conically tapered towards the mixing chamber 12, thus including on the one hand a sealing ring creates a sealing seal between the mixing chamber 12 and the environment and, on the other hand, defined opening diameters can be provided in the abrasive medium pipe according to the desired abrasive medium delivery rate. In this way, the abrasive medium pipe 161 can be replaced very quickly and selected according to the required conditions.
  • a defined distance between the lower edge 210 of the mixing chamber body and the upper edge of the outlet nozzle 21 can be set by an appropriately selected stop ring 39.
  • a targeted addition of fluid can take place via the resulting annular gap.
  • the fluid is supplied through a suitable hole in the stop nut.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Proposed is a device (10) for cutting and cleaning objects, as well as for the controlled removal of material, by means of a high-pressure water jet (15) which passes through a mixing chamber (12), where an abrasive (160) is added to the water jet (15), the mixing chamber extending from an inlet (13) located in a water inlet jet (17) to an outlet (14). The mixing chamber (12) is formed by a bore disposed in the mixing-chamber housing (120) along the axis (18) of the inlet jet (17) and bounded at the inlet-jet end (19) by the inlet jet (17).

Description

Die Erfindung betrifft eine Vorrichtung zum Schneiden und Reinigen von Gegenständen sowie zum gezielten Materialabtrag mittels eines unter Hochdruck befindlichen, eine Mischkammer von einem in einer Wassereintrittsdüse ausgebildeten Einlaß zu einem Auslaß durchquerenden Wasserstrahls, dem ein Abrasivmittel in der Mischkammer durch Einbringen in den Wasserstrahl zugeführt wird, wobei die Mischkammer durch eine zur Eintrittsdüsenachse axiale Bohrung in einem Mischkammerkörper gebildet wird, die wassereintrittsdüsenseitig durch die Wassereintrittsdüse begrenzt wird.The invention relates to a device for cutting and cleaning objects and for targeted material removal by means of a high-pressure water jet that crosses a mixing chamber from an inlet formed in a water inlet nozzle to an outlet, to which an abrasive in the mixing chamber is fed by being introduced into the water jet. wherein the mixing chamber is formed by a bore in a mixing chamber body which is axial to the inlet nozzle axis and which is delimited by the water inlet nozzle on the water inlet nozzle side.

Eine Vorrichtung dieser Art ist bekannt (EP-A-0 221 236; US-A-2 290 979).A device of this type is known (EP-A-0 221 236; US-A-2 290 979).

Sowohl die bekannte Vorrichtung als auch andere bekannte Vorrichtungen gleicher Art sind grundsätzlich für einen Umgebungsdruck von 1 bar (atmosphärischer Normaldruck) optimiert. Bei verschiedenen Anwendungen der Vorrichtung muß unter erhöhtem Umgebungsdruck gearbeitet werden, was den erheblichen Nachteil mit sich bringt, daß die Schneid-, Reinigungs- und Abtragsleistung der Vorrichtung erheblich abfällt, was seine Ursache im wesentlichen in der Aufweitung des Wasserstrahls nach Austritt aus der Wassereintrittsdüse, d.h. im Bereich der Mischung zwischen Wasser und Abrasivmittel hat. Hinzu kommt, daß bei erhöhtem Umgebungsdruck eine Zunahme der mitgeförderten Luftmasse durch den Ansaugvorgang des Abrasivmittels festgestellt wurde, was ebenfalls die Leistung der Vorrichtung nachteilig beeinflußt.Both the known device and other known devices of the same type are basically for one Optimized ambient pressure of 1 bar (atmospheric normal pressure). In various applications of the device, work must be carried out under increased ambient pressure, which has the considerable disadvantage that the cutting, cleaning and removal performance of the device drops considerably, which is essentially due to the expansion of the water jet after it emerges from the water inlet nozzle, ie in the area of the mixture between water and abrasive. In addition, at increased ambient pressure, an increase in the air mass conveyed was determined by the suction process of the abrasive, which also adversely affects the performance of the device.

Es sei erwähnt, daß diesem gravierenden Problem bisher im Stand der Technik keine nennenswerte Aufmerksamkeit geschenkt wurde mit der folge, daß auch keine Wege zur Lösung dieses Problems vorgeschlagen wurden.It should be mentioned that this serious problem has not been given any significant attention in the prior art, with the result that no ways of solving this problem have been proposed.

Es ist Aufgabe der vorliegenden Erfindung eine Vorrichtung zu schaffen, die bei hohem Umgebungsdruck arbeitet und die dabei gegenüber der Leistung bei normalem Umgebungsdruck im wesentlichen keine signifikante Einbuße erfährt, wobei die Vorrichtung gegenüber bekannten Vorrichtungen für normalen Umgebungsdruck nicht komplizierter im Aufbau sein soll und ebenfalls zu gleichen Kosten wie bekannte Vorrichtungen, die unter Normaldruckbedingungen arbeiten, herstellbar sein soll.It is an object of the present invention to provide a device which operates at high ambient pressure and which does not experience any significant loss in comparison to the performance at normal ambient pressure, the device not being more complicated in construction than known devices for normal ambient pressure and also to same cost as known devices that work under normal pressure conditions, should be producible.

Gelöst wird die Aufgabe gemäß der Erfindung dadurch, daß die Bohrung der Mischkammer und die Wassereintrittsdüse zylindrisch ausgebildet sind und gleichen Durchmesser haben, wobei die Wassereintrittsdüse teilweise in die Bohrung der Mischkammer hineinsteht.The object is achieved according to the invention in that the bore of the mixing chamber and the water inlet nozzle are cylindrical and have the same diameter, the water inlet nozzle partially protruding into the bore of the mixing chamber.

Im Gegensatz zu unter Normaldruck arbeitenden bekannten Vorrichtungen, bei denen die Mischkammer verhältnismäßig großvolumig ausgebildet ist und im wesentlichen durch einen Gehäusekörper, der im Inneren die Mischkammer einschließt, gebildet wird, ist bei der erfindungsgemäßen Vorrichtung lediglich eine zur Wassereintrittsdüsenachse axiale Bohrung vorgesehen, die als Mischkammer definierten Durchmessers und definierter axialer Länge ausgebildet werden kann. Da die Strahlaufweitung des in die Mischkammer eintretenden Wasserstrahles proportional zum Umgebungsdruck ansteigt, ist es wegen des daraus sich ergebenden Reflektionsverhaltens des Wasserstrahlmantels mit einfachen Mitteln erfindungsgemäß möglich, über einen definierten Druckbereich vorbestimmter Größe eine optimale Einlaufgeometrie zu schaffen, die mit einfachen Mitteln unmittelbar dem vorherrschenden Druck angepaßt ist, d.h. durch vorbestimmte axiale Länge und/oder vorbestimmten Durchmesser der Bohrung.In contrast to known devices operating under normal pressure, in which the mixing chamber is of relatively large volume and is essentially formed by a housing body which encloses the mixing chamber inside, the device according to the invention only provides an axial bore for the water inlet nozzle axis, which acts as a mixing chamber defined diameter and defined axial length can be formed. Since the jet expansion of the water jet entering the mixing chamber increases in proportion to the ambient pressure, it is possible according to the invention with simple means, due to the resulting reflection behavior of the water jet jacket, to create an optimal inlet geometry over a defined pressure range that is directly matched to the prevailing pressure by simple means is adjusted, ie by predetermined axial length and / or predetermined diameter of the bore.

Eine wesentliche Schwierigkeit bei Vorrichtungen dieser Art besteht darin, die auf vorangehend beschriebene Art gewonnene hohe Schneidleistung der Vorrichtung auch bei hohem Umgebungsdruck nicht dadurch wieder zunichte zu machen, daß Leistungsverluste durch fertigungstoleranzenbedingte Achsfehler zwischen Eintrittsdüsenachse und Austrittsdüsenachse bzw. Auslaßachse im Mischkammerkörper auftreten. Fertigungsfehler und/oder Montagefehler können dabei einen ganz erheblichen Einfluß auf die Leistung der Vorrichtung ausüben, wenn sie kumulieren, mit der Folge, daß die Leistung signifikant abfällt. Um Ausrichtfehler zwischen der Eintrittsdüsenachse und der Auslaufachse auf einfache Weise auszugleichen, steht die Wassereintrittsdüse wenigstens teilweise in die Mischkammer hinein.A major difficulty with devices of this type is that the high cutting performance of the device obtained in the manner described above, even at high ambient pressure, is not negated by the fact that performance losses due to manufacturing errors-related axis errors occur between the inlet nozzle axis and outlet nozzle axis or outlet axis in the mixing chamber body. Manufacturing errors and / or assembly errors can have a very considerable influence on the performance of the device if they accumulate, with the result that the performance drops significantly. In order to compensate for alignment errors between the inlet nozzle axis and the outlet axis in a simple manner, the water inlet nozzle stands at least partially into the mixing chamber.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung wird der Mischkammerkörper in einem Körperhalter aufgenommen, der auf der einen Seite mit einem Anschlußstück zum Anschluß an eine Hochdruckwasserquelle und auf der anderen Seite mit einer Anschlagmutter in Verbindung steht. Diese Ausgestaltung der Vorrichtung ermöglicht es vorteilhafterweise den Mischkammerkörper, entsprechend den Druckbedingungen in der Umgebung der Vorrichtung, schnell auszuwechseln, da der Mischkammerkörper praktisch als Einsatz mit äußerlich gleicher Geometrie und unterschiedlichen Bohrungsgrößen leicht und schnell ausgetauscht werden kann.According to an advantageous embodiment of the invention, the mixing chamber body is received in a body holder, which on one side with a connector for connection to a high pressure water source and on the other side is connected to a stop nut. This configuration of the device advantageously enables the mixing chamber body to be quickly replaced in accordance with the pressure conditions in the vicinity of the device, since the mixing chamber body can be exchanged easily and quickly practically as an insert with an externally identical geometry and different bore sizes.

Dazu ist es vorteilhaft, die Verbindungen mittels Gewindeverbindungen auszubilden, die einerseits eine selbsttätige Achsjustierung zwischen Anschlußstück und damit der Eintrittsdüse einerseits und andererseits zwischen dem Mischkammerkörper und somit der Austrittsdüsenachse bzw. der Mischkammerkörperachse ermöglichen. Hinzu kommt noch, daß Gewindeverbindungen dieser Art verhältnismäßig schnell und damit ohne Werkzeug gelöst bzw. festgesetzt werden können.For this purpose, it is advantageous to form the connections by means of threaded connections which, on the one hand, enable an automatic axis adjustment between the connecting piece and thus the inlet nozzle on the one hand and on the other hand between the mixing chamber body and thus the outlet nozzle axis or the mixing chamber body axis. Added to this is the fact that threaded connections of this type can be loosened or fixed relatively quickly and thus without tools.

Grundsätzlich kann die eigentliche Austrittsdüse wegen ihrer besonderen Anforderungen an ihre Härte gesondert von Mischkammerkörpern ausgebildet sein. Es ist jedoch aus Gründen beispielsweise der vereinfachten Lagerhaltung einerseits und einer vereinfachten Fertigung und damit einer Kostenersparniß andererseits vorteilhaft, den Mischkammerkörper in seiner Verlängerung einstückig mit der Austrittsdüse auszubilden.In principle, the actual outlet nozzle can be formed separately from mixing chamber bodies because of its special requirements regarding its hardness. However, for reasons of simplified storage, on the one hand, and simplified production and thus cost savings, on the other hand, it is advantageous to form the extension of the mixing chamber body in one piece with the outlet nozzle.

Bedingt dadurch, daß die Wassereintrittsdüse als gesondertes Teil in der Regel im unteren Teil des Anschlußstückes sitzt und dort lediglich zwischen dem Anschußstück und dem Mischkammerkörper eingeklemmt wird, kann es vorteilhaft sein, daß der im wesentlichen zylindrisch ausgebildete Mischkammerkörper mit seitlichem Spiel in der im wesentlichen zylindrisch ausgebildeten Bohrung des Körperhalters aufgenommen wird, um so Toleranzen im Sitz der Wassereintrittsdüse im Anschlußstück ohne Einschränkung der Leistung der Vorrichtung auszugleichen, da es im wesentlichen darauf ankommt, eine axiale Ausrichtung zwischen Eintrittsdüsenachse und Austrittsdüsenachse zu erreichen.Due to the fact that the water inlet nozzle as a separate part usually sits in the lower part of the connecting piece and is only clamped there between the connecting piece and the mixing chamber body, it can be advantageous that the essentially cylindrical mixing chamber body with lateral play in the substantially cylindrical trained bore of the body holder is added, so tolerances in To compensate for the seat of the water inlet nozzle in the connection piece without restricting the performance of the device, since it is essential to achieve an axial alignment between the inlet nozzle axis and the outlet nozzle axis.

Ein weiterer Vorteil bei einstückig ausgebildetem Mischkammerkörper mit der Austrittsdüse ist die üblicherweise gute Übereinstimmung der Achsen der Mischkammerbohrung und der Austrittsdüsenbohrung, die sich aus dem Fertigungsprozeß ergibt. Bei paßgenauer Ausführung der Wasserdüse in der Mischkammerbohrung ergibt sich so automatisch eine exakte Ausrichtung der Wasserdüsenachse zur Austrittsdüsenachse.Another advantage of a one-piece mixing chamber body with the outlet nozzle is the usually good correspondence between the axes of the mixing chamber bore and the outlet nozzle bore, which results from the manufacturing process. If the water nozzle is precisely fitted in the mixing chamber bore, this automatically results in an exact alignment of the water nozzle axis with the outlet nozzle axis.

Die Fertigungstoleranzen des Körperhalters haben keinerlei Einfluß auf die Ausrichtung der Achsen.The manufacturing tolerances of the body holder have no influence on the alignment of the axes.

Bei einer anderen vorteilhaften Ausgestaltung der Vorrichtung wird in der Anschlagmutter eine gesonderte Buchseneinrichtung aufgenommen, die eine Bohrung zur Aufnahme einer zum Mischkammerkörper gesonderten Austrittsdüse aufweist. Bei dieser Ausgestaltung kann beispielsweise der Mischkammerkörper aus nicht so hochwertigem Werkstoff wie die Austrittsdüse als einfacher zylindrischer Körper hergestellt werden, während die Austrittsdüse durch die Anschlagmutter, in der Buchseneinrichtung fixiert sitzend, in axialer Ausrichtung Stirnfläche an Stirnfläche an den Mischkammerkörper gedrückt wird.In another advantageous embodiment of the device, a separate bushing device is accommodated in the stop nut, which has a bore for receiving an outlet nozzle separate from the mixing chamber body. In this embodiment, for example, the mixing chamber body can be made from a material that is not as high-quality as the outlet nozzle as a simple cylindrical body, while the outlet nozzle is pressed against the mixing chamber body in axial alignment, end face to end face, by the stop nut, seated in the socket device.

Um Achsfehler zwischen der Achse des Mischkammerkörpers und der Achse der Austrittsdüse bei getrennter Ausbildung ausgleichen zu können, ist es vorteilhaft, daß die Bohrungsachse der Bohrung zur Buchseneinrichtungsachse exzentrisch ausgebildet ist.In order to be able to compensate for axis errors between the axis of the mixing chamber body and the axis of the outlet nozzle with a separate design, it is advantageous for the bore axis of the bore to be eccentric to the axis of the bushing device.

Um insbesondere bei der vorangehend beschriebenen Ausgestaltung der Vorrichtung einen sicheren Sitz der Austrittsdüse relativ zum Mischkammerkörper zu erreichen, ist die Anschlagmutter mit einer mit einem Durchgangsloch versehenen Überwurfmutter verschlossen, wobei durch das Durchgangsloch das freie Ende der Austrittsdüse hindurchsteht und zwischen Überwurfmutter und Buchseneinrichtung ein Anschlagring, der fest mit der Austrittsdüse verbunden ist, eingeschlossen wird.In order to achieve a secure fit of the outlet nozzle relative to the mixing chamber body, in particular in the embodiment of the device described above, the stop nut is closed with a union nut provided with a through hole, the free end of the outlet nozzle projecting through the through hole and a stop ring between union nut and bushing device, which is firmly connected to the outlet nozzle.

Die axiale Länge der Mischkammer liegt vorteilhafterweise im Bereich zwischen 2-4 mm.The axial length of the mixing chamber is advantageously in the range between 2-4 mm.

Der Abrasivmitteleinlaß ist vorteilhafterweise durch den Mischkammerkörper hindurch in die Mischkammer eingeführt, so daß die vorangehend beschriebene Geometrie der als Bohrung ausgebildeten Mischkammer im Mischkammerkörper im wesentlichen nicht gestört wird.The abrasive inlet is advantageously introduced through the mixing chamber body into the mixing chamber, so that the geometry of the mixing chamber designed as a bore in the mixing chamber body described above is essentially not disturbed.

Es ist dabei vorteilhaft, den Abrasivmitteleinlaß durch ein Abrasivmittelrohr auszubilden, das in den Abrasivmitteleinlaß auswechselbar eingesetzt wird. Der Abrasivmitteleinlaß ist zur eigentlichen Mischkammer hin vorzugsweise konisch verjüngt ausgebildet, so daß eine Abrasivmitteleinlaßöffnung in den Mischkammerkörper hinein mit definierter Größe festgelegt werden kann.It is advantageous to form the abrasive inlet through an abrasive tube that is interchangeably inserted into the abrasive inlet. The abrasive agent inlet is preferably tapered towards the actual mixing chamber, so that an abrasive agent inlet opening can be defined in the mixing chamber body with a defined size.

Um diese Größe je nach Einsatzart der Vorrichtung variieren zu können, weist das Abrasivmittelrohr ein Außengewinde auf, das in ein entsprechendes, im Mischkammerkörper und/oder im Körperhalter ausgebildetes Innengewinde eingreift, so daß auf einfache Weise sehr schnell Abrasivmittelrohre unterschiedlicher Geometrien eingesetzt werden können.In order to be able to vary this size depending on the type of use of the device, the abrasive agent tube has an external thread which engages in a corresponding internal thread formed in the mixing chamber body and / or in the body holder, so that abrasive agent tubes of different geometries can be used very quickly in a simple manner.

Um die Eintrittsgeometrie des Wasser-Abrasivmittel-Gemisches in den Auslaß der Austrittsdüse bzw. den Mischkammerkörper nochmals den veränderten Bedingungen bei höherem Umgebungsdruck besser anpassen zu können, ist vorteilhafterweise die Mischkammer an ihrem zum Auslaß für das Wasser-Abrasivmittel-Gemisch weisenden Ende trichterförmig verjüngt ausgebildet.In order to be able to better adapt the entry geometry of the water-abrasive mixture into the outlet of the outlet nozzle or the mixing chamber body again to the changed conditions at higher ambient pressure, the mixing chamber is advantageously tapered in a funnel shape at its end facing the outlet for the water-abrasive mixture .

Wie schon erwähnt, steht die Austrittsdüse aufgrund der auf sie wirkenden hohen mechanischen Einflüsse durch das Wasser-Abrasivmittel-Gemisch unter sehr hoher mechanischer Beanspruchung. Aus diesem Grunde ist, wie allgemein üblich, die Austrittsdüse aus geeignetem Hartstoff hergestellt. Es kann aber auch sinnvoll und damit vorteilhaft sein, ebenfalls den Mischkammerkörper aus dem gleichen Hartstoff auszubilden, wenn beispielsweise der Mischkammerkörper und die Außtrittsdüse einstückig hergestellt werden, wobei dann der erhöhte Materialaufwand für den Mischkammerkörper vergleichsweise in den Hintergrund tritt gegenüber den Herstellungskosten gesonderter Mischkammerkörper aus gesondertem Werkstoff.As already mentioned, the outlet nozzle is under very high mechanical stress due to the high mechanical influences on it by the water-abrasive mixture. For this reason, as is common practice, the outlet nozzle is made of a suitable hard material. However, it can also be sensible and therefore advantageous to likewise form the mixing chamber body from the same hard material if, for example, the mixing chamber body and the outlet nozzle are manufactured in one piece, in which case the increased material expenditure for the mixing chamber body takes a back seat compared to the production costs of separate mixing chamber bodies from a separate one Material.

Zur Beeinflussung der Strahlgeometrie an der Austrittsdüse sowie des Abriebverhaltens der Austrittsdüsenbohrung ist vorteilhafterweise eine zusätzliche Fluidzugabeeinrichtung im Austrittsdüsenbereich vorgesehen. Dabei kann diese Zugabe über eine oder mehrere Fluidkanäle senkrecht oder unter einem spitzen Winkel in Strahlrichtung zur Austrittsdüsenbohrung erfolgen oder über eine ringförmige Zugabegeometrie. Bei Verwendung einer nicht einstückig mit dem Mischkammerkörper ausgebildeten Abrasivdüse kann dieses vorzugsweise an der Teilungsstelle erfolgen.To influence the jet geometry at the outlet nozzle and the abrasion behavior of the outlet nozzle bore, an additional fluid addition device is advantageously provided in the outlet nozzle region. This addition can take place vertically or at an acute angle in the jet direction to the outlet nozzle bore via one or more fluid channels or via an annular addition geometry. When using an abrasive nozzle that is not formed in one piece with the mixing chamber body, this can preferably take place at the dividing point.

Dabei kann durch die Fluidart und den Fluiddruck unterschiedliches Strahlverhalten erreicht werden. In der hier beschriebenen Vorrichtung kann neben der vorzugsweise trockenen Abrasivmittelzugabe, bestehend aus Abrasivmaterial und Luft oder Gas, auch die Nasszugabe, bestehend aus Wasser und Abrasivmaterial, zur Anwendung kommen. Der Druckbereich, in dem die Abrasivmittelzugabe vorteilhafterweise arbeitet, darf zwischen 1 und ca. 300 bar liegen.Different jet behavior can be achieved through the type of fluid and the fluid pressure. In addition to the preferably dry addition of abrasive consisting of abrasive material and air or gas, the wet addition consisting of water and abrasive material can also be used in the device described here. The pressure range in which the addition of the abrasive advantageously works can be between 1 and approx. 300 bar.

Die Erfindung wird nun unter Bezugnahme auf die nachfolgenden schematischen Zeichnungen anhand zweier Ausführungsbeispiele beschrieben. Darin zeigen:

Fig. 1
im Schnitt einer erste Ausführungsform der Vorrichtung und
Fig. 2
im Schnitt eine zweite Ausführungsform der Vorrichtung.
The invention will now be described with reference to the following schematic drawings using two exemplary embodiments. In it show:
Fig. 1
in section of a first embodiment of the device and
Fig. 2
in section a second embodiment of the device.

Die Vorrichtung 10 besteht im wesentlichen aus einem Mischkammerkörper 120 sowie einem sogenannten Anschlußstück 121, das an einer freien Seite mit einer hier nicht dargestellten Druckleitung auf bekannte Weise verbunden ist. Das Anschlußstück 121 weist ein im wesentlichen zentral hindurchführendes Durchgangsloch auf, durch daß das über die nicht dargestellte Druckleitung herangeführte Wasser entsprechend dem Pfeil 15 hindurchgeht. Am unteren, der Mischkammer 12 zugewandten Ende des Anschlußstückes 121 ist ein Düseneinsatz vorgesehen, der beispielsweise die aus einem Hartwerkstoff wie Saphir oder dergleichen hergestellte Wassereintrittsdüse 17 umfaßt. Der Düseneinsatz sitzt bei den hier beschriebenen Ausführungsformen der Vorrichtung 10 in einem am unteren Ende, bezogen auf die Figuren, ausgebildeten konischen Sitz im Anschlußstück 121. Der Düseneinsatz weist ein durch diesen im wesentlichen zentral hindurchgehendes Durchgangsloch auf, wobei das eine Ende des Durchgangsloches, das zur Mischkammer 12 hinweist, einen Einlaß 13 des Wassers bzw. Wasserstrahls 15 in die Mischkammer 12 bildet.The device 10 consists essentially of a mixing chamber body 120 and a so-called connector 121, which is connected on a free side to a pressure line, not shown here, in a known manner. The connecting piece 121 has an essentially central through hole through which the water brought in via the pressure line, not shown, passes according to the arrow 15. At the lower end of the connecting piece 121 facing the mixing chamber 12, a nozzle insert is provided which comprises, for example, the water inlet nozzle 17 made of a hard material such as sapphire or the like. In the embodiments of the device 10 described here, the nozzle insert is seated in a conical seat in the connecting piece 121 formed at the lower end, based on the figures Nozzle insert has a through hole which passes through it essentially centrally, the one end of the through hole which points towards the mixing chamber 12 forms an inlet 13 of the water or water jet 15 into the mixing chamber 12.

Der Mischkammerkörper 120 ist im wesentlichen rotationssymmetrisch in Form eines Zylinders ausgebildet. Dabei wird die eigentliche Mischkammer 12 durch eine zur Eintrittsdüsenachse 18 axiale Bohrung gebildet, die wassereintrittsdüsenseitig 19 durch die Wassereintrittsdüse 17 begrenzt wird. Die Wassereintrittsdüse 17 steht dabei in die Mischkammer hinein, wobei sich die Wassereintrittsdüse 17 mit einem flanschartigen Kragen 170 auf der oberen Begrenzungsfläche 123 des Mischkammerkörpers 120 aufstützt.The mixing chamber body 120 is essentially rotationally symmetrical in the form of a cylinder. The actual mixing chamber 12 is formed by a bore which is axial to the inlet nozzle axis 18 and which is delimited by the water inlet nozzle 17 on the water inlet nozzle side 19. The water inlet nozzle 17 projects into the mixing chamber, the water inlet nozzle 17 being supported by a flange-like collar 170 on the upper boundary surface 123 of the mixing chamber body 120.

Die axiale Länge 122 der Mischkammer 12 liegt im Bereich von 2-8 mm, vorzugsweise im Bereich von 2-4 mm, wobei beispielsweise Kammerdurchmesser von 2-8 mm vorteilhaft sind.The axial length 122 of the mixing chamber 12 is in the range of 2-8 mm, preferably in the range of 2-4 mm, with chamber diameters of 2-8 mm being advantageous, for example.

In die als Bohrung ausgebildete Mischkammer 12 wird das Abrasivmittel 160 in den vom Einlaß 13 zu einem Auslaß 14, der hier im Mischkammerkörper 120 ausgebildet ist, die Mischkammer 12 durchquerenden Wasserstrahl 15 auf bekannte Weise eingegeben.In the mixing chamber 12 designed as a bore, the abrasive agent 160 is introduced in a known manner into the water jet 15 passing through the mixing chamber 12 from the inlet 13 to an outlet 14, which is formed here in the mixing chamber body 120.

Die Wassereintrittsdüsenachse 18 und somit die des Wasserstrahls 15 muß, um eine optimale Energieübertragung des Wasserstrahls 15 auf das Abrasivmittel 160 sicherzustellen, hochgenau axial zur Austrittsdüsenachse 24 bzw. zur Mischkammerkörperachse 124 ausgerichtet sein.The water inlet nozzle axis 18 and thus that of the water jet 15 must, in order to ensure optimal energy transmission of the water jet 15 to the abrasive 160, be aligned with high precision axially to the outlet nozzle axis 24 or to the mixing chamber body axis 124.

Der Mischkammerkörper 120 wird in einem Körperhalter 25 aufgenommen. Dieser wird auf seiner einen Seite 250 mit dem Anschlußstück 121 und auf der anderen Seite 151 mit einer Anschlagmutter 32 über dort jeweils ausgebildete Gewindeverbindungen 252, 253 verbunden. Der Mischkammerkörper 120 selbst ist im wesentlichen zylindrisch ausgebildet. Die im Körperhalter 25 durchlaufende Bohrung 254 ist ebenfalls im wesentlichen zylindrisch ausgebildet und ist derart bemessen, daß der Mischkammerkörper 120 in ihr mit radialem Spiel aufgenommen wird.The mixing chamber body 120 is received in a body holder 25. This is connected on one side 250 to the connector 121 and on the other side 151 to a stop nut 32 via threaded connections 252, 253 formed there in each case. The mixing chamber body 120 itself is essentially cylindrical. The bore 254 passing through the body holder 25 is likewise essentially cylindrical and is dimensioned such that the mixing chamber body 120 is received in it with radial play.

Bei der in Fig. 1 dargestellten Ausgestaltung der Vorrichtung 10 ist der Mischkammerkörper 120 einstückig mit der Austrittsdüse 21 ausgebildet, und zwar in der Verlängerung der nach Außen weisenden Verlängerung des Mischkammerkörpers 120. Die Anschlagmutter 32, die in ihrer Innenbohrung 33 einen Rezeß 34 aufweist, schließt den Mischkammerkörper 120, der an dieser Stelle entsprechend im Durchmesser verjüngt ausgebildet ist, haltend ein. Die Innenbohrung 33 hat einen größeren Durchmesser als der Durchmesser der als Verlängerung im Mischkammerkörper 120 ausgebildeten Austrittsdüse 21, wobei der Durchmesser derart bemessen ist, daß die Austrittsdüse 21 mit Spiel durch die Innenbohrung 33 hindurchtritt.In the embodiment of the device 10 shown in FIG. 1, the mixing chamber body 120 is formed in one piece with the outlet nozzle 21, namely in the extension of the outward extension of the mixing chamber body 120. The stop nut 32, which has a recess 34 in its inner bore 33, includes holding the mixing chamber body 120, which is correspondingly tapered in diameter at this point. The inner bore 33 has a larger diameter than the diameter of the outlet nozzle 21 formed as an extension in the mixing chamber body 120, the diameter being dimensioned such that the outlet nozzle 21 passes through the inner bore 33 with play.

Im unteren Teil der Austrittsdüse 21 kann ein Fluidkanal 212 oder mehrere Fluidkanäle vorhanden sein, die rechtwinklig oder unter spitzem Winkel (hier unter 45°) zur Austrittsdüsenachse 24 verlaufen. Die Fluidkanäle stehen über einen Ringspalt 321 mit einem Fluidzugabeanschluß 36 in Verbindung. Ein Dichtringpaar 320 realisiert den Druckabschluß gegenüber der Umgebung.In the lower part of the outlet nozzle 21 there can be a fluid channel 212 or a plurality of fluid channels which run at right angles or at an acute angle (here at 45 °) to the outlet nozzle axis 24. The fluid channels are connected via an annular gap 321 to a fluid addition connection 36. A pair of sealing rings 320 realizes the pressure closure from the environment.

Bei der in Fig. 2 dargestellten Ausführungsform der Vorrichtung 10 ist der Mischkammerkörper 120 getrennt von der Austrittsdüse 21 ausgebildet. In der dortigen Anschlagmutter 32 wird eine gesonderte Buchseneinrichtung 28 aufgenommen. Die Buchseneinrichtung 28 weist eine Bohrung 29 zum Durchtritt bzw. zur Aufnahme der Austrittsdüse 21 auf. Die Bohrungsachse 30 der Bohrung 29 kann zur Buchseneinrichtungsachse 31 exzentrisch ausgebildet sein, so daß Fehlertoleranzen aller Komponenten der Vorrichtung derart ausgeglichen werden können, daß eine axiale Ausrichtung der Eintrittsdüsenachse 18, der Mischkammerkörperachse 124 und der Austrittsdüsenachse 24 erreicht wird und ein axialer Fehler zu null geht.In the embodiment of the device 10 shown in FIG. 2, the mixing chamber body 120 is formed separately from the outlet nozzle 21. A separate bushing device 28 is received in the stop nut 32 there. The bushing device 28 has a bore 29 for the passage or for receiving the outlet nozzle 21. The bore axis 30 of the bore 29 can be formed eccentrically to the bushing device axis 31, so that fault tolerances of all components of the device can be compensated in such a way that an axial alignment of the inlet nozzle axis 18, the mixing chamber body axis 124 and the outlet nozzle axis 24 is achieved and an axial error goes to zero .

Die Anschlagmutter 32 weist bei der Ausführungsform gemäß Fig. 2 an ihrem nach außen weisenden Ende ein Außengewinde 35 auf, auf dem eine mit einem Durchgangsloch 38 versehene Überwurfmutter 40 sitzt. Der Durchmesser des Durchgangsloches 38 ist so bemessen, daß die Austrittsdüse 21 mit Spiel durch das Durchgangsloch 38 hindurchragt. Mittels Anschlagring 39 wird die Austrittsdüse 21 in der Buchseneinrichtung 28 bzw. im Anschlagring 39 gehalten und mit seiner einen ebenen Begrenzungsfläche 210 gegen die untere Begrenzungsfläche 125 des Mischkammerkörpers 120 gedrückt und in dieser Stellung fixiert. Wie eingangs erwähnt, wird über einen Abrasivmitteleinlaß 16 in die Mischkammer 12 hinein das Abrasivmittel gefördert. Der Abrasivmitteleinlaß 16 wird durch ein darin einsetzbares Abrasivmittelrohr 161 gebildet, das ein Außengewinde 162 aufweist. Das Außengewinde 162 greift in ein entsprechendes Innengewinde 225 ein, das entweder im Mischkammerkörper 120 und/oder im Körperhalter 25 ausgebildet sein kann. Der Abrasivmitteleinlaß 16 ist zur Mischkammer 12 hin konisch verjüngt ausgebildet, womit einerseits unter Einschluß eines Dichtungsringes ein dichtender Abschluß zwischen Mischkammer 12 und der Umgebung geschaffen wird und andererseits definierte Öffnungsdurchmesser im Abrasivmittelrohr entsprechend der gewünschten Abrasivmittelförderrate vorgesehen werden können. Das Abrasivmittelrohr 161 kann auf diese Weise sehr schnell ausgewechselt werden und den geforderten Bedingungen entsprechend ausgewählt werden.In the embodiment according to FIG. 2, the stop nut 32 has an external thread 35 at its outward end, on which a union nut 40 provided with a through hole 38 is seated. The diameter of the through hole 38 is dimensioned such that the outlet nozzle 21 projects through the through hole 38 with play. The outlet nozzle 21 is held in the bushing device 28 or in the stop ring 39 by means of the stop ring 39 and pressed with its one flat boundary surface 210 against the lower boundary surface 125 of the mixing chamber body 120 and fixed in this position. As mentioned at the beginning, the abrasive is conveyed into the mixing chamber 12 via an abrasive inlet 16. The abrasive inlet 16 is formed by an abrasive tube 161 which can be inserted therein and which has an external thread 162. The external thread 162 engages in a corresponding internal thread 225, which can be formed either in the mixing chamber body 120 and / or in the body holder 25. The abrasive agent inlet 16 is conically tapered towards the mixing chamber 12, thus including on the one hand a sealing ring creates a sealing seal between the mixing chamber 12 and the environment and, on the other hand, defined opening diameters can be provided in the abrasive medium pipe according to the desired abrasive medium delivery rate. In this way, the abrasive medium pipe 161 can be replaced very quickly and selected according to the required conditions.

Durch einen entsprechend gewählten Anschlagring 39 kann ein definierter Abstand zwischen der Mischkammerkörperunterkante 210 und der Oberkante der Austrittsdüse 21 eingestellt werden. Über den dadurch entstehenden ringförmigen Spalt kann eine gezielte Fluidzugabe erfolgen. Die Fluidzuführung erfolgt über eine geeignete Bohrung in der Anschlagmutter. Bezugszeichenliste 253 Gewinde 10 Vorrichtung 254 Bohrung 11 Wasser-Abrasivmittel-Gemisch 255 Innengewinde 12 Mischkammer 26 Mischkammerinnenwand 120 Mischkammerkörper 121 Anschlußstück 28 Buchseneinrichtung 122 axiale Länge 123 obere Begrenzungsfläche 29 Bohrung 124 Mischkammerkörperachse 30 Bohrungsachse 125 untere Begrenzungsfläche 31 Buchseneinrichtungsachse 126 Mischkammerkörperbohrung 13 Einlaß (Wassereintrittsdüse) 32 Anschlagmutter 14 Auslaß (Austrittsdüse bzw. Mischkammerkörper) 320 Dichtringe 321 Ringkanal 15 Wasserstrahl 33 Innenbohrung 16 Abrasivmitteleinlaß 34 Rezeß 160 Abrasivmittel 35 Außengewinde 161 Abrasivmittelrohr 36 Fluidzugabeanschluß 162 Außengewinde 163 Abrasivmitteleinlaßachse 37 17 Wassereintrittsdüse 38 Durchgangsloch 170 flanschartiger Kragen 39 Anschlagring 18 Eintrittsdüsenachse 40 Überwurfmutter 19 Wassereintrittsdüsenseite 20 Austrittsdüsenbohrung 21 Austrittsdüse 210 Begrenzungsfläche 212 Fluidkanal 22 trichterförmige Ausbildung 23 Düsenöffnung 24 Austrittsdüsenachse 25 Körperhalter 250 Seite 251 Seite 252 Gewinde A defined distance between the lower edge 210 of the mixing chamber body and the upper edge of the outlet nozzle 21 can be set by an appropriately selected stop ring 39. A targeted addition of fluid can take place via the resulting annular gap. The fluid is supplied through a suitable hole in the stop nut. Reference list 253 thread 10th contraption 254 drilling 11 Water-abrasive mixture 255 inner thread 12th Mixing chamber 26 Mixing chamber inner wall 120 Mixing chamber body 121 Connector 28 Bushing device 122 axial length 123 upper boundary surface 29 drilling 124 Mixing chamber body axis 30th Bore axis 125 lower boundary surface 31 Bushing axis 126 Mixing chamber body bore 13 Inlet (water inlet nozzle) 32 Stop nut 14 Outlet (outlet nozzle or mixing chamber body) 320 Sealing rings 321 Ring channel 15 Water jet 33 Inner bore 16 Abrasive inlet 34 Recessive 160 Abrasive 35 External thread 161 Abrasive center tube 36 Fluid addition port 162 External thread 163 Abrasive agent inlet axis 37 17th Water inlet nozzle 38 Through hole 170 flange-like collar 39 Stop ring 18th Inlet nozzle axis 40 Cap nut 19th Water inlet nozzle side 20th Exit nozzle bore 21 Outlet nozzle 210 Boundary surface 212 Fluid channel 22 funnel-shaped training 23 Nozzle opening 24th Exit nozzle axis 25th Body holder 250 page 251 page 252 thread

Claims (18)

  1. An apparatus for cutting and cleaning objects and for the controlled removal of material by means of a high-pressure water jet (15) traversing a mixing chamber (12) from an inlet (13) constructed in a water inlet nozzle (17) and passing to an outlet and to which jet an abrasive agent (160) is added in the mixing chamber (12) by being incorporated into the water jet (15), the mixing chamber (12) being formed by an, in relation to the axis (18) of the inlet jet, axial bore in a mixing chamber body (120), defined at the water inlet jet end (19) by the water inlet jet (17), characterised in that the bore in the mixing chamber (12) and the water inlet jet (17) are of cylindrical construction and are of the same diameter, the water inlet jet (17) projecting partially into the bore in the mixing chamber (12).
  2. An apparatus according to claim 1, characterised in that the mixing chamber body (120) is housed in a body holder (25) connected on one side (250) to a connecting piece (121) for connection to a high-pressure water source and on the other side (251) to an abutment nut (32).
  3. An apparatus according to claim 2, characterised in that the connections are scewthreaded connections (252, 253).
  4. An apparatus according to one or more of claims 1 to 3, characterised in that the mixing chamber body (120) is in its extension constructed in one piece with the outlet jet (21).
  5. An apparatus according to one or more of claims 2 to 4, characterised in that the substantially cylindrical mixing chamber body (120) is housed with lateral clearance in the substantially cylindrical bore (254) in the body holder (25).
  6. An apparatus according to one or more of claims 2 to 5, characterised in that there is accommodated in the abutment nut (32) a bush arrangement (28) comprising a bore (29) to accommodate the outlet jet (21).
  7. An apparatus according to claim 6, characterised in that the axis (30) of the bore (29) is constructed so that it is eccentric in relation to the axis (31) of the bush arrangement.
  8. An apparatus according to one or more of claims 2 to 7, characterised in that the abutment nut (32) is closed by as cap nut (40) in which there is a through bore.
  9. An apparatus according to one or more of claims 1 to 8, characterised in that the axial length (122) of the mixing chamber (12) is in the range from 2 to 4 mm.
  10. An apparatus according to one or more of claims 1 to 9, characterised in that an abrasive medium inlet (16) leads through the mixing chamber body (120) into the mixing chamber (12).
  11. An apparatus according to claim 10, characterised in that the abrasive medium inlet (16) is constituted by an abrasive medium tube (161) which can be inserted into it.
  12. An apparatus according to one or both of claims 10 or 11, characterised in that the abrasive medium inlet (16) is constructed so that it tapers conically towards the mixing chamber (12).
  13. An apparatus according to one or both of claims 11 or 12, characterised in that the abrasive medium tube (161) has an external screwthread (162) which engages a corresponding internal screwthread (255) constructed in the mixing chamber body (120) and/or in the body holder (25).
  14. An apparatus according to one or more of claims 1 to 13, characterised in that the mixing chamber (12) is, at its end which is towards the outlet (14) for the mixture (12) of water and abrasive medium, constructed so that it tapers like a funnel.
  15. An apparatus according to one or more of claims 1 to 4, characterised in that the mixing chamber body (120) consists of a mechanically resistant material.
  16. An apparatus according to one or more of claims 1 to 15, characterised in that in the mixing chamber body (120) or in the outlet jet (21) in the direction of the water jet (15) there is under the abrasive medium inlet (16) at least one fluid passage (212) which opens out into the outlet jet bore (20).
  17. An apparatus according to claim 16, characterised in that there is constructed around the mixing chamber body (120) or the outlet jet (21) an annular passage (321) into which discharges on the one hand the fluid channel (212) and on the other a fluid adding connection (36), the annular passage (321) being sealed on both sides by gaskets (320) in respect of the mixing chamber body (120) or the outlet jet (21).
  18. An apparatus according to one or more of claims 4 to 16, characterised in that between the lower boundary surface (125) of the mixing chamber body (120) and the oppositely disposed boundary surface (210) of the outlet jet (21) there is a gap of predetermined width for the supply of fluid and into which on the one hand a fluid adding connection (36) discharges and which on the other discharges into the mixing chamber bore (126) and/or the outlet jet bore (20).
EP91903878A 1990-02-23 1991-02-20 Device for cutting and cleaning objects using a water/abrasive mixture at high pressure Expired - Lifetime EP0515449B1 (en)

Applications Claiming Priority (3)

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DE4005691A DE4005691A1 (en) 1990-02-23 1990-02-23 DEVICE FOR CUTTING AND CLEANING OBJECTS BY MEANS OF A WATER-ABRASIVE MIXTURE AT HIGH AMBIENT PRESSURE
DE4005691 1990-02-23
PCT/DE1991/000131 WO1991012930A1 (en) 1990-02-23 1991-02-20 Device for cutting and cleaning objects using a water/abrasive mixture at high pressure

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EP0515449A1 EP0515449A1 (en) 1992-12-02
EP0515449B1 true EP0515449B1 (en) 1994-11-30

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US4951429A (en) * 1989-04-07 1990-08-28 Flow Research, Inc. Abrasivejet nozzle assembly for small hole drilling and thin kerf cutting

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE43824E1 (en) 2001-01-11 2012-11-20 Powder Pharmaceuticals Inc. Needleless syringe
US8540665B2 (en) 2007-05-04 2013-09-24 Powder Pharmaceuticals Inc. Particle cassettes and processes therefor
US9044546B2 (en) 2007-05-04 2015-06-02 Powder Pharmaceuticals Incorporated Particle cassettes and processes therefor
US9358338B2 (en) 2007-05-04 2016-06-07 Powder Pharmaceuticals Incorporated Particle cassettes and processes therefor

Also Published As

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DE4005691A1 (en) 1991-08-29
WO1991012930A1 (en) 1991-09-05
EP0515449A1 (en) 1992-12-02
DE59103698D1 (en) 1995-01-12

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