EP1323479A1 - Two-piece high pressure nozzle - Google Patents

Abstract

High pressure nozzle (1), especially for high pressure cleaning devices, is made in two parts and comprises a nozzle basic body (2) directly or indirectly receiving at least one nozzle insert (3) having at least one nozzle bore (14). The nozzle insert is provided upstream inside the high pressure nozzle with at least one further recess (13). <??>Preferred Features: The recess directly adjoins the nozzle bore and has a greater diameter and/or a greater volume than the nozzle bore.

Description

The invention relates to a high-pressure nozzle, in particular for a High-pressure cleaning device according to the generic term of the independent Claim 1.

The invention is not intended to apply only to high-pressure nozzles High-pressure cleaning devices, but the High-pressure nozzles according to the invention can also be used in other devices and Devices are used, which with a pressure use working medium.

Furthermore, the invention is not intended to be as described below so-called "pull system" of the high pressure nozzle may be limited, but which in the invention is intended to cover all high-pressure nozzles in which Recesses are made in the inaccessible interior of the High pressure nozzle should be located upstream of the outlet side.

In the following, however, reference will only be made to a high-pressure nozzle in high-pressure cleaning devices according to the so-called "pull system".

In these known embodiments of high pressure nozzles It was high-pressure cleaning equipment based on the so-called "pull system" so far not possible these high pressure nozzles even in small dimensions manufacture. The reason was the difficulty of the mechanical Machining inside the high pressure nozzle upstream of the outlet side at diminishing dimensions of the high pressure nozzles.

This "pull principle" has a transverse groove on the "inner" nozzle contour, which in the current manufacturing process using a router left and right of Nozzle hole is milled. A corresponding one was used for cross milling minimum bore diameter of the nozzle bore required. "Inner" Nozzle contour means inside the high-pressure nozzle upstream of the Outlet side, i.e. the spray lance and the high-pressure cleaning device facing and thus also when removed from the spray lance Areas difficult to access with high pressure nozzle.

The object of the present invention is therefore a high pressure nozzle especially for high pressure cleaning devices and especially after Develop the Pullen principle of the prior art in such a way that also very small dimensions of high pressure nozzles in a simple and inexpensive way and ways can be made.

The technical teaching of independent claim 1.

An essential feature here is that the high-pressure nozzle according to the invention is now formed at least in two parts and a nozzle body includes, in which a nozzle insert with at least one nozzle bore is recorded which nozzle insert upstream inside the High pressure nozzle is provided with at least one recess.

It is preferred that this recess approximately in the form of a transverse groove symmetrical on both sides of the approximately central cylindrical nozzle bore is provided what the nozzle described in the pull principle equivalent. This creates a kind of cascade for what flows through Medium, which is sprayed through the approximately central cylindrical Hole of the nozzle body enters the nozzle insert, there first in an enlarged vestibule, then into the aforementioned elongated one Cross groove, which merges into the cylindrical nozzle bore, which in the If necessary, the atmosphere opens out via a further transverse groove.

Here, the flow rate of the high pressure medium is first reduced in the enlarged anteroom, and then when passing through the Cross groove and the nozzle bore more and more enlarged, so that at The medium at the highest speed emerges from the nozzle bore achieved.

Due to the cascade-like narrowing of the recesses (anteroom, transverse groove and nozzle bore) of the nozzle insert is also used for acceleration the material of the nozzle insert is also spared and thus the service life of the high-pressure nozzle is significantly increased. So if anteroom and transverse groove would be missing and only the cylindrical nozzle bore would be available would be that the high pressure medium would be at full power on the Impact the nozzle insert and thus cause damage over time.

The advantage of the high-pressure nozzle according to the invention is that within the Nozzle insert in its particularly small bore such transverse grooves can be introduced according to the Pullen principle, since according to the invention the nozzle insert is now independent of Nozzle base body can be processed individually.

So first the nozzle insert is produced as a blank, then the small nozzle hole is inserted, and immediately afterwards then the transverse groove by means of machining e.g. mill brought in. Of course, the transverse groove can also be in front of the nozzle bore be introduced. After the nozzle insert is completely manufactured then this is detachable or non-detachable in the basic nozzle body brought in.

By at least dividing the high-pressure nozzle according to the invention the part of the high pressure nozzle in which the cylindrical nozzle bore is because this as a separate part in the form of Nozzle insert is formed, which nozzle insert then according to the invention can be processed independently of the nozzle body.

This nozzle insert, as well as the nozzle bore located in it, can accordingly be executed very small, that is, the processing of Cross groove with a milling cutter does not cause any problems since the Accessibility is optimal.

As already mentioned above, the nozzle insert may or may not be detachable be releasably connected to the nozzle body, in particular in The detachable design of the nozzle insert also includes other basic nozzle bodies various dimensions, connection threads etc. can be installed can. The nozzle body and nozzle insert are preferably pressure-tight pressed together. This results in a reduction in manufacturing costs and Simplify logistics.

The nozzle insert can also be made of very high quality material, to improve the service life. The nozzle insert can be used here, for example made of ceramic, plastic, etc., including combinations of these materials can be used.

Especially in the detachable version of the nozzle insert from Nozzle body and for very brittle materials such as Ceramic, can be used to seal the nozzle insert to the nozzle body special sealing element may be provided. This sealing element can for example in the form of an O-ring, of course all other forms of sealing rings can also be provided can.

In the non-detachable version, the nozzle insert is over a Press fit introduced into the nozzle body, so that also with this a pressure-tight connection of these two parts without additional Sealing ring is done. Of course, also with the non-solvable Version with press fit between the nozzle insert and the nozzle body a sealing element can be introduced.

In another embodiment of the invention, the nozzle insert can also be made of Steel, which nozzle insert is then in particular in the form of a Sheet metal stamping part is realized with the advantage of a very Inexpensive alternative to machining to achieve manufactured nozzle insert. With the fine stamping embossing part you can achieved very smooth surfaces compared to the drilled and milled nozzle what positively affects the effectiveness of the nozzle. This stamping part can also installed as a nozzle insert in any nozzle body become.

The division of the high pressure nozzle according to the invention into the Nozzle base body and the nozzle insert are not intended to be restrictive here be understood, but in other embodiments, both the Nozzle base body, like the nozzle insert, again in two parts or be formed in several parts, so that overall a multi-part high-pressure nozzle provided. However, it is preferred if the high-pressure nozzle has one or more multi-part nozzle body, and a one-piece introduced therein Includes nozzle insert.

It is also preferred that the nozzle insert within a recess in the Nozzle base body is pressed into a non-detachable press fit or the Removable nozzle insert and pressure-tight within the Recess in the nozzle body is made detachable.

Both the nozzle body, as well as the nozzle insert can in their Basic shape can be shaped almost arbitrarily, one essentially cylindrical basic shape of at least the nozzle insert is preferred. Also the nozzle body can be cylindrical and / or conical and also stepped his.

It is therefore essential in the present invention that the nozzle insert is on the inner nozzle contour has a recess, in particular a transverse groove, which in particular with the actual approximately cylindrical or conical Nozzle hole is connected.

Here, the transverse groove is above as seen in the direction of flow of the medium the actual roughly cylindrical or conical nozzle bore, leading to an advantageous acceleration and training of the shape of the Nozzle jet leads. The transverse groove in the pull system is therefore in the High pressure nozzle directed inwards, i.e. from the nozzle body and Nozzle insert inwards towards spray lance and cleaning device directed.

In the following the invention will be described in more detail by means of the attached drawings explained, which are to be understood only as examples and the invention should not restrict.

Figur 1:

einen Schnitt durch die erfindungsgemäße Hochdruckdüse im Längsschnitt;

Figur 2:

die Unteransicht gemäß Figur 1, also die Ansicht in Strömungsrichtung;

Figur 3:

den erfindungsgemäßen Düseneinsatz in perspektivischer Darstellung mit Blick auf die Quernut;

Figur 4:

einen Schnitt durch den Düseneinsatz gemäß Figur 3 entlang der Längsachse der Quernut;

Figur 5:

die erfindungsgemäße Hochdruckdüse gemäß Figur 1 mit in die zentrale Bohrung eingebrachtem Fräser zur Darstellung der Unmöglichkeit der Bearbeitung der Quernut bei geringen Dimensionen der Hochdruckdüse ;

Figur 6:

zeigt eine einteilige Hochdruckdüse nach dem Stand der Technik mit Fräser zur Bearbeitung der Quernut;

Figur 7:

zeigt eine erfindungsgemäße Hochdruckdüse mit mehreren Düseneinsätzen im Längsschnitt;

Figur 8:

zeigt eine erfindungsgemäße Hochdruckdüse mit mehreren Düsenbohrungen im Längsschnitt.

Figur 9:

zeigt die erfindungsgemäße Hochdruckdüse mit mehreren Düseneinsätzen der Figur 7 in der Stirnansicht im Längsschnitt;

Figur 10:

zeigt die erfindungsgemäße Hochdruckdüse mit mehreren Düsenbohrungen der Figur 8 in der Stirnansicht im Längsschnitt.

It shows:

Figure 1:

a section through the high pressure nozzle according to the invention in longitudinal section;

Figure 2:

the bottom view of Figure 1, so the view in the direction of flow;

Figure 3:

the nozzle insert according to the invention in a perspective view with a view of the transverse groove;

Figure 4:

a section through the nozzle insert according to Figure 3 along the longitudinal axis of the transverse groove;

Figure 5:

the high-pressure nozzle according to the invention according to Figure 1 with a bur inserted in the central bore to illustrate the impossibility of machining the transverse groove with small dimensions of the high-pressure nozzle;

Figure 6:

shows a one-piece high-pressure nozzle according to the prior art with milling cutter for machining the transverse groove;

Figure 7:

shows a high-pressure nozzle according to the invention with several nozzle inserts in longitudinal section;

Figure 8:

shows a high-pressure nozzle according to the invention with several nozzle bores in longitudinal section.

Figure 9:

shows the high pressure nozzle according to the invention with several nozzle inserts of Figure 7 in front view in longitudinal section;

Figure 10:

shows the high pressure nozzle according to the invention with several nozzle bores of Figure 8 in the front view in longitudinal section.

Figure 1 shows a high pressure nozzle 1 with the two components Nozzle base body 2 and nozzle insert 3, the nozzle insert 3 on front free end of the nozzle body 2 is added, that is High pressure nozzle outlet 1.

This connection between the nozzle insert 3 and the nozzle body 2 is how already described in the general description section, about a press fit realized, the sealing of the nozzle insert 3 to Nozzle body 2 can be done by an all-round O-ring 4, which, however, can also be omitted.

The nozzle insert 3 is therefore within a recess 5 of the base body 2 connected to this via a press fit, the bottom of which Recess 5 within a circumferential groove on the jacket and on the inner end face of the nozzle insert 3 of the O-ring 4, which is a pressure-tight sealing of the two parts 3 and 2 causes.

The nozzle base body 2 consists of an in the inner free end essential conical part 6 with external thread, through which the High-pressure nozzle 1 detachably connected to a spray lance, not shown can be.

Following the conical threaded part 6 is a key shoulder 7 formed, which the screwing and unscrewing the high pressure nozzle 1 simplified / from the lance head.

This key approach goes into the front, outer free end 8 of the Nozzle base body 2, in which the opening 5 for the nozzle insert 3rd is introduced at the front.

The compression of the nozzle insert 3 in the opening of the nozzle body 2 can take place via a direct radial pressing and / or an axial and radial flange 9, which in the front free end 8 of the nozzle body 2 is formed.

The nozzle body 2 shown here, as is the nozzle insert 3 rotationally symmetrical, but not necessarily solution is necessary.

A through hole is centrally located in the center of the nozzle body 2 10 introduced, which the spray lance media-guiding with the nozzle bore 14 of the nozzle insert 3 connects. The direction of the nozzle insert 3 located part of the central bore 10 is with a widening 11 Adjust the diameter to the nozzle insert 3. This Widening 11 then goes in the nozzle body 2 itself into the opening 5 of the upper free end 8, into which opening 5 the nozzle insert 3 is pressed.

FIG. 2 shows a bottom view of FIG. 1, with an alternative here it is shown that the nozzle insert 3 in the nozzle base body 2 is screwed in, in contrast to the pressing according to Figure 1. Also can the nozzle insert 3 in the nozzle body 2 by other detachable Connections have been made, e.g. Bayonet connection, Snap connection, pinning etc.

The closer formation of the nozzle insert 3 now show in particular the Figures 3 and 4. The nozzle insert 3 is disc-shaped in its basic form cylindrical and has on the, the bore 10 of the Side facing the nozzle body 2, an approximately spherical antechamber 12, which merges into a transverse groove 13, to which transverse groove 13 the approximately Central cylindrical bore 14 connects, which in turn in a recess 15 passes, which faces the environment.

The medium can thus in the flow direction 20 in the bore 10 of the Nozzle base body 2, then to widen it 11, then into the vestibule 12 of the nozzle insert 3, then get into its inner transverse groove 13, and then via the nozzle bore 14 into the outer recess 15 and from there into Free flow in flow direction 21.

FIG. 4 shows the insert 3 in section along the longitudinal axis of the transverse groove 13, wherein the upper, outwardly directed recess 15 is not closer here is shown. This is therefore a modification of insert 3 according to FIG. 1 and 5th

Figures 5 and 6 now show the problem of milling the Cross groove by means of a milling cutter in the nozzle insert 3 into a high pressure nozzle 1 according to the present invention (Figure 5) and according to a high pressure nozzle according to the prior art (Figure 6). There is also the problem of small dimensions of the nozzle insert 3 to see what the present Invention avoids that the high-pressure nozzle 1 formed at least in two parts as nozzle insert 3 and nozzle base body 2 is. As a result, in the present invention, the nozzle insert 3 independently and separately from the nozzle body 2 by means of the milling cutter 16 are processed and in particular the inner transverse groove 13 without problems can be introduced without the cutter 16 over the central Bore 10 of the nozzle body 2 must be inserted.

According to FIGS. 5 and 6, to produce the transverse groove 13 the Milling cutter 16 can be moved in the arrow directions 17 and 18. Figure 6 shows here a high pressure nozzle with larger dimensions according to the state of the Technology, so that there is a transverse displacement of the cutter 16 in the Arrow directions 18 within the bore 10a is possible without problems, according to Figure 5 due to the small diameter of the central Bore 10 does not have a transverse movement in the arrow directions 17 of the milling cutter 16 is easily possible and therefore the transverse groove 13 is not in its full Dimensions can be brought.

Therefore, the invention sees a separation between the nozzle insert 3 and the nozzle body 2 in front, so that the nozzle insert 3 separately from Nozzle base body 2 can be edited and thus the cutter 16 freely in the arrow directions 17 outside the bore 10 for producing the transverse groove 13 can move without the central bore 10 of the Nozzle base body 2 would hinder the movement of the cutter 16.

7 and 8 are further developments of the invention High-pressure nozzle shown in longitudinal section, wherein Figure 7 is a high-pressure nozzle 22 with several nozzle inserts 3a, 3b, 3c, 3d shows, whereas FIG. 8 shows one High-pressure nozzle 23 with a single nozzle insert 3 with several Shows nozzle bores 14a, 14b, 14c, 14d, with the same reference numerals designate the same components as in the previous figures.

The high-pressure nozzle 22 according to FIG. 7 contains, for example, four Nozzle inserts 3a-3d at the front free end of the base body 2, which Nozzle inserts 3a-3d e.g. at an even angular distance of 90 ° each cylindrical end face of the base body 2 are distributed. Of course you can too more or less than four nozzle inserts 3 may be provided.

It is important in this version with several nozzle inserts 3 that these are held over a support grid 24. This support grid 24 is extensive segmented or self-contained and with the base body 2 not detachable via a radial press fit and / or radial and axial Flaring connected or detachable via e.g. a screw thread or a Bayonet connection connected.

In the example according to FIG. 7, the support grid 24 is segmented circumferentially formed so that the nozzle inserts 3a-3d are radial on the one hand support on the inside (in relation to the base body 2) and radially on the other outside (in relation to the base body 2) on the inner circumference of the base body 2 itself. The nozzle inserts 3 are here via flanges 9a-d front ends of the support grid 24 and the flange 9 of the base body 2 committed to this. Others are also removable and non-removable Fastening options such as screwing, bayonet connection, soldering, Welding etc. possible.

As already mentioned, the support grid 24 can also be a closed one Have outer contour, so that the nozzle inserts 3 completely in the support grid 24 are included, which in turn is completely in the base body 2 is included.

According to FIG. 7, each of the nozzle inserts 3 has at least one Nozzle bore 14 with a transverse groove adjoining it upstream 13 and an optional upstream storage room 12th

The high-pressure nozzle 23 according to FIG. 8 contains only a single one Nozzle insert 3 at the front free end of the base body 2, the Nozzle insert 3 has, for example, four nozzle bores 14. Each upstream of the nozzle bores 14 each close a transverse groove 13 and optionally a storage space 12 to the transverse groove 13.

FIG. 9 shows the high pressure nozzle according to FIG. 7 in the end view seen the flow direction 21. The four nozzle inserts 3a-3d are in the Base body 2 received via the support grid 24 and have each other the same angular distance of approx. 90 °, with different ones Cross-sectional shapes of the nozzle bores 14a-14d are introduced, which but is not necessary for a solution.

Figure 10 shows the high pressure nozzle according to Figure 8 in the front view seen the flow direction 21. The only nozzle insert 3 is in Base body 2 is included and contains four nozzle bores 14a-14d, which have the same angular distance of approx. 90 ° to each other and which are again different in cross section, but what is not necessary for a solution.

In summary, the invention relates to a high-pressure nozzle, especially for high pressure cleaning devices and especially after Pullen principle formed, with at least one nozzle bore, the High pressure nozzle is formed at least in two parts and one Includes nozzle body, in which at least one nozzle insert with the at least one nozzle bore is received directly or indirectly, which nozzle insert upstream inside the high pressure nozzle with at least one further recess is provided. Here, the Nozzle base body and / or the nozzle insert itself in turn in several parts trained and / or multiple use of the nozzle insert. Advantage is that even very small dimensions of high pressure nozzles with one Nozzle insert with an outside diameter of less than 10 mm, a through hole in the Nozzle base body of less than 5 mm and a nozzle bore of less than 2.5 mm can be produced in a simple and inexpensive manner.

drawing Legend

1.

high-pressure nozzle

Second

Nozzle body

Third

nozzle insert

4th

O-ring

5th

outer recess in 2nd

6th

inner free end of 2 threaded

7th

Key approach from 2

8th.

outer free end of 2

9th

flanging

10th

Through hole in 2nd

11th

widening

12th

anteroom

13th

transverse groove

14th

nozzle bore

15th

outer recess in 3

16th

milling cutter

17th

Machining direction for 16

18th

Machining direction for 16

19th

High pressure nozzle (state of the art)

20th

Flow direction medium inlet in 1

21st

Flow direction medium outlet in 1

22nd

High pressure nozzle with several nozzle inserts

23rd

High pressure nozzle with several nozzle holes

24th

support grid

Claims (25)

High-pressure nozzle (1, 22, 23), in particular for high-pressure cleaning devices and in particular designed according to the Pullen principle, with at least one nozzle bore (14), characterized in that the high-pressure nozzle (1, 22, 23) is formed in at least two parts and a nozzle base body (2) contains, in which at least one nozzle insert (3) with the at least one nozzle bore (14) is received directly or indirectly, which at least one nozzle insert (3) is provided upstream in the interior of the high-pressure nozzle (1) with at least one further recess (13). High-pressure nozzle (1, 22, 23) according to claim 1, characterized in that the at least one further recess (13) directly adjoins the at least one nozzle bore (14). High-pressure nozzle (1, 22, 23) according to one of claims 1 or 2, characterized in that the at least one recess (13) has a larger diameter and / or a larger volume than the nozzle bore (14). High-pressure nozzle (1, 22, 23) according to one of claims 1 to 3, characterized in that the at least one recess (13) is designed as an elongated transverse groove, the longitudinal axis of which is approximately perpendicular to the longitudinal axis of the nozzle bore (14). High-pressure nozzle (1, 22, 23) according to one of claims 1 to 4, characterized in that the at least one recess (13) connects upstream directly to an antechamber (12) with an enlarged diameter and / or volume. High-pressure nozzle (1, 22, 23) according to one of claims 1 to 5, characterized in that the at least one recess (13) is approximately symmetrical to the longitudinal axis of the nozzle bore (14). High-pressure nozzle (1, 22, 23) according to one of claims 1 to 6, characterized in that the at least one nozzle insert (3) and / or the nozzle base body (2) is / are approximately rotationally symmetrical. High-pressure nozzle (1, 22, 23) according to one of claims 1 to 7, characterized in that at least the at least one nozzle insert (3) is cylindrical in its outer basic shape. High-pressure nozzle (1, 22, 23) according to one of claims 1 to 8, characterized in that the at least one nozzle insert (3) is received in a recess (5) in the nozzle base body (2) via an axial and / or radial fixation. High-pressure nozzle (1, 22, 23) according to claim 9, characterized in that the axial and / or radial fixing of the at least one nozzle insert (3) in the nozzle base body (2) takes place via at least one flange (9). High-pressure nozzle (1, 22, 23) according to claim 10, characterized in that the area of the at least one flange (9) is integrally connected to the nozzle base body (2). High-pressure nozzle (1, 22, 23) according to one of claims 10 or 11, characterized in that the at least one flanging (9) is located in the end region of the free outer end of the nozzle base body (2) and is deformed radially inwards such that the at least one nozzle insert (3) is clamped at least axially. High-pressure nozzle (1, 22, 23) according to any one of claims 9 to 12, characterized in that the axial and radial fixing of the at least one nozzle insert (3) in the front recess (5) of the nozzle base body (2) takes place via a radial press fit. High-pressure nozzle (1, 22, 23) according to one of claims 1 to 13, characterized in that the nozzle base body (2) and the at least one nozzle insert (3) are detachably connected to one another. High-pressure nozzle (1, 22, 23) according to claim 14, characterized in that the releasable connection takes place via a thread (Fig.2). High-pressure nozzle (1, 22, 23) according to one of claims 1 to 15, characterized in that the at least one nozzle insert (3) and / or the nozzle base body (2) is / are in turn made of several parts. High-pressure nozzle (1, 22, 23) according to one of claims 1 to 16, characterized in that the at least one nozzle insert (3) has an outer diameter of approximately 10 mm or smaller, the through hole (10) in the nozzle base body (2) has a diameter of about 5 mm or smaller and the diameter of the nozzle bore (14) is about 2.5 mm or smaller. High-pressure nozzle (1, 22, 23) according to one of claims 1 to 17, characterized in that the at least the transverse groove (13) is introduced by machining. High-pressure nozzle (1, 22, 23) according to one of claims 1 to 18, characterized in that the material of the at least one nozzle insert (3) is made of ceramic and / or plastic and / or steel. High-pressure nozzle (1, 22, 23) according to claim 19, characterized in that when the at least one nozzle insert (3) is formed from steel, this is implemented in the form of a sheet metal fine-stamped embossed part. High-pressure nozzle (22) according to one of claims 1 to 20, characterized in that more than a single nozzle insert (3) is received at the front free end of the base body (2), which nozzle inserts (3) each have at least one nozzle bore (14) with one contain a transverse groove (13) adjoining it upstream and a storage space (12) optionally adjoining it upstream (FIG. 7). High-pressure nozzle (22) according to claim 21, characterized in that the plurality of nozzle inserts (3) are connected directly and / or indirectly to the base body (2) via at least one support grid (24). High-pressure nozzle (22) according to any one of claims 21 or 22, characterized in that the support grid (24) is circumferentially closed, so that the nozzle inserts (3) are not in direct contact with the base body (2). High-pressure nozzle (22) according to one of claims 21 or 22, characterized in that the support grid (24) is designed to be openly segmented on the circumference, so that the nozzle inserts (3) are also in direct contact with the base body (2). High-pressure nozzle (23) according to one of claims 1 to 21, characterized in that only a single nozzle insert (3) is received at the front free end of the base body (2), which nozzle insert (3) more like a single nozzle bore (14) with a contains a transverse groove (13) adjoining it upstream and an optionally adjacent storage space (12) adjoining it upstream (FIG. 8).

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