EP2390006B1 - Rotor nozzle - Google Patents

Description

The invention relates to a rotor nozzle, in particular for high-pressure cleaning devices, with a nozzle housing having at its one end an inlet opening and at the other end an outlet opening for a fluid, in particular water, and arranged with a in a rotor chamber of the nozzle housing, with his to Outlet opening facing the front end supported on a bearing and at least partially flowed through by the fluid rotor, which is displaceable by rotating fluid into the rotor space in rotation about a longitudinal axis and inclined at least in the rotating state to the longitudinal axis.

Such rotor nozzles are basically known and serve to expel the respective fluid, in particular under high pressure as a conical fluid jet.

Rotor nozzles are also used for cleaning containers or such cavities, in particular contaminated or clogged pipe or duct systems, in which the rotor nozzle can be reciprocated substantially only parallel to the longitudinal axis of its nozzle housing. It is often provided that a portion of the supplied fluid is ejected in such a way that the rotor nozzle is thereby driven by the recoil principle, ie it is thereby in a sense realized a "self-propelled" rotor nozzle. Against this background, it is desirable to minimize the weight of the rotor nozzle as possible. Furthermore, it is desirable in particular with regard to a possible use in pipe or duct systems, the outer skin of the Rotary nozzle to make interchangeable, since the wear of the outer skin plays such a central role in such applications, ie the outer skin has a significantly lower life than the actual nozzle. In addition, the pipes or channels to be cleaned may have different sensitivities to mechanical influences, so that it is also desirable to design a rotor nozzle to be used for cleaning pipes or channels so that the outer skin can be changed in the simplest possible way.

A rotor nozzle, which is suitable for cleaning containers or for cleaning pipe or duct systems is, for example, in DE 198 43 185 A1 described.

A rotor nozzle according to the preamble of claim 1 is made EP 0563595 A1 known.

The object of the invention is to provide a rotor nozzle of the type mentioned, which has a replaceable outer skin with the lowest possible weight and high intrinsic stability compared to the pressure of the supplied fluid.

The solution of this object is achieved by the features of claim 1.

According to the invention the rotor nozzle is provided with a connection and support member which is formed on the one hand for connection of the rotor nozzle to a fluid supply line and on the other hand as a support for an outer cap of the rotor nozzle, wherein the connection and support member comprises a connecting portion on which the outer cap to the terminal and carrier member, in particular by screwing, can be coupled, and wherein the rotor space is limited in relation to the longitudinal axis radial direction at least partially by the connecting portion. In accordance with the invention, the connection and support member, hereinafter also referred to simply as the "connection carrier", not only serves to connect the rotor nozzle to the fluid supply, but moreover extends to a certain extent "forwardly extended" in order at least partially to form the rotor space. In this respect, it is according to the invention the connection carrier, which forms at least a part of the nozzle housing, which takes place in known rotor nozzles by other components.

The inventive concept offers a number of advantages. On the one hand, the connecting portion of the connection carrier which delimits the rotor space can simultaneously serve for coupling the outer cap, which is therefore advantageous, since a comparatively large axial length is available for this coupling, for example by screwing, between the connection carrier and the outer cap. Furthermore, the material of the connecting portion and thus of the connection carrier can be selected independently of the material required for the particular application for the outer cap. In particular, it is possible to manufacture the connection carrier, including the connection section, of metal and to provide a plastic material for the outer cover. The rotor nozzle according to the invention can thus be provided, so to speak, with an inner stability core, which absorbs the mechanical load due to the pressurized fluid and thus keeps away from the outer cap. Furthermore, it is advantageous that according to the invention the nozzle housing, unlike in known rotor nozzles, is not formed exclusively by that component which delimits the rotor space. By dividing into a connecting portion of the connection carrier on the one hand and an outer cap on the other hand, the latter can be made of a material of relatively low weight, which advantageously the net weight of the rotor nozzle is reduced overall. Also - as explained above - Required interchangeability of the outer skin of the rotor nozzle is ensured by the couplable with the connecting portion of the connection carrier outer cap.

Preferred embodiments of the invention are also specified in the dependent claims, the description and the drawings.

In particular, the connecting portion may extend over more than a quarter or over more than half the axial length of the rotor space.

As already mentioned, the coupling between outer cap and connecting portion is preferably carried out by screwing. For this purpose, the outside of the connecting portion may be provided with a thread for screwing to the outer cap, which is provided for this purpose with a corresponding internal thread. In this case, the connecting portion of the connection carrier forming at least part of the boundary of the rotor space advantageously provides a large thread length in comparison with known rotor nozzles.

Furthermore, it can be provided according to the invention that at least one driving bore communicating with the rotor space for the fluid is formed on the connection and carrier member.

Furthermore, it is provided in one embodiment that at least one outwardly opening outlet opening for the fluid, which serves for ejecting a cleaning and / or drive jet, is formed on the connection and support member.

The connecting portion may be free of outlet openings except for an opening forming the outlet opening or leading to the outlet opening.

The invention makes it possible to design all the facilities required for the guidance, guidance and / or distribution of the fluid on the connection and support member. In the design of the outer cap therefore takes no account of this. In particular, it is not necessary to provide the outer cap with outlet openings for the fluid.

According to the invention it is provided that the connection and support member and the outer cap together define an annular space into which the fluid flows and from which the fluid passes to the outside via at least one drive bore in the rotor space and the other via at least one outlet opening ,

As a result, it is not necessary to provide, in addition to the outlet opening for the fluid jet issuing from the rotor, additional outlet openings or outlet channels which emanate from the rotor space. Consequently, a separation between the system for the rotary drive of the rotor and the ejection of the fluid via the rotor on the one hand and an additionally provided, in particular for driving the rotor nozzle serving fluid outlet system is thereby provided. In particular, it is possible to realize an additional fluid outlet system for cleaning or driving purposes without pressure loss with respect to that system which provides for the rotary drive of the rotor and for the ejection of the fluid via the rotor.

Furthermore, this ensures that the amount of fluid required for rotary or rotary drive of the rotor is independent of the amount of fluid used for the other "tasks" of the fluid supplied, in particular for driving the rotor nozzle according to the recoil principle. In this context, it should be mentioned that preferably the rotor nozzle is designed such that at least approximately not more than a quarter of the supplied amount of fluid passes into the rotor space in order to set the rotor in rotation and to be ejected via the rotor.

Advantageously, at least one sealing of the above-mentioned annular space - or generally serving a whatsoever purpose, of the connection and support member and outer cap together limited fluid space - exclusively or supportively by a screw thread between the outer cap and connecting portion of the connection and support member ,

Preferably, the connection and support member is integrally formed.

As already mentioned, it can be provided that the outer cap is made of plastic. For this purpose, in particular a shock-resistant or impact-absorbing plastic can be used. Not only by the generally low weight of the rotor nozzle, but also by this gentle design of the outer cap damage to the inner walls of the pipes or channels can be avoided when used as a pipe or sewer cleaning nozzle.

Fig. 1-3

jeweils verschiedene Ansichten eines möglichen Ausführungsbeispiels einer erfindungsgemäßen Rotordüse.

The invention will now be described by way of example with reference to the drawings. Show it:

Fig. 1-3

each different views of a possible embodiment of a rotor nozzle according to the invention.

In the Fig. 1 illustrated rotor nozzle according to the invention comprises a rotor 21 which is arranged in a rotor chamber 17, wherein the rotor chamber 17 is located within a nozzle housing, which will be discussed in more detail below. The concrete, known per se structure of the rotor 21 may be basically arbitrary, so that will not be discussed in detail. In the rotor chamber 17 passing fluid, especially water, provides for a rotational drive of the rotor 21, enters the rotor 21 and leaves it at its front end via an outlet opening 15 of the rotor nozzle.

If one designates as a "nozzle housing" a component of a rotor nozzle of the type in question, on the one hand limits the rotor space 17 and on the other hand forms the outside of the rotor nozzle, then the nozzle housing in the rotor nozzle according to the invention insofar divided into two, as the rotor chamber 17 substantially through a connection portion 29 of a connection and support member 25 described in more detail below is limited, whereas the outside or outer skin of the rotor nozzle is formed by a separate component, namely an outer cap 27 made in particular of plastic, which is screwed onto the connecting portion 29.

According to the invention that part of the axial length of the rotor chamber 17, which is formed by the connecting portion 29, also vary, ie be shorter or longer than in Fig. 1 shown.

In a front opening of the outer cap 27 is seated a bearing 19, in which the rotor 21 is supported with its front, formed by a nozzle end and in which an outlet opening 15 of the rotor nozzle forming opening is formed.

The connection and support member 25, which is also referred to below simply as a connection carrier, comprises in addition to the connection section 29 a connection section 45 which in this embodiment is comparatively short and provided with an internal thread with which a fluid supply line (not shown here) can be screwed the rotor nozzle according to the invention is connectable, for example, with a high-pressure cleaner, not shown. The connection portion 45 defines an inlet space 41 for the supplied fluid.

Between the connecting portion 29 and the connecting portion 45 of the integrally formed, preferably made of metal connection carrier 25 is a Fluidleit- or -verteilerabschnitt which includes, inter alia, a radially or with a radial component extending inlet channel 43, the inlet space 41 with an annular space 35 connects. The annular space 35 is delimited jointly by the connection carrier 25 and by the outer cap 27.

The sealing of the annular space 35 takes place at two axially spaced-apart sealing areas 37, 39. While the rear sealing area 37 comprises an O-ring, the screw thread for screwing the outer cap 27 onto the connecting portion 29 in the manner of a labyrinth seal is at least one component of the front sealing area 39 The front sealing area 39 also includes a sealing contact between an inwardly facing shoulder 47 on the outer cap 27 and the front, annular end face of the connecting portion 29th

The seal in the front sealing region 39 can be made exclusively by the mentioned screw thread, exclusively by the mentioned interaction of shoulder 47 of the outer cap 27 and end face of the connecting portion 29 or by a combination of both. In addition, at least one O-ring may be provided at a suitable location.

Starting from the annular space 35 extending in the connection carrier 25 obliquely rearwardly at least three circumferentially about a longitudinal axis 23 of the rotor nozzle evenly distributed outlet openings or channels 33, of which the sectional view of Fig. 1 an outlet opening 33 shows. The outlet openings 33 serve to drive the rotor nozzle according to the recoil principle.

Furthermore, the annular space 35 is in fluid communication with the rotor chamber 17, via a driving bore or a drive channel 31, which opens with a radial and / or tangential component in the annular space 17, so that via the driving bore 31 inflowing fluid in Rotor space 17 generates a ring or vortex flow, which sets the rotor 21 in a rotational movement about the longitudinal axis 23, whereby due to the given during operation inclined orientation of the rotor 21 with respect to the nozzle longitudinal axis 23 from the outlet port 15 of the rotor nozzle, a conical fluid jet is ejected , Closer does not need to be discussed on this principle known operating principle of a rotary nozzle.

The number of opening into the rotor chamber 17 Treibbohrungen 31 is basically arbitrary.

Advantageously, in the rotor nozzle according to the invention, the outer cap 27 can be made of a basically arbitrary material. The stability of the rotor nozzle, in particular with regard to the fluid pressure, is ensured by the connecting portion 29 of the connection carrier 25.

Furthermore, it is advantageous according to the invention that all functions required for the distribution of the fluid are provided by the connection carrier 25, in which not only the inlet space 41 but also the inlet channel 43, the driving bore 31 and the outlet openings 33 are formed.

The fact that the outlet openings 33, which provide in particular for the recoil drive of the rotor nozzle, are formed in the connection carrier 25 ensures an advantageous separation of the rotary drive for the rotor 21 caused by the drive bore 31 from the recoil drive of the rotor nozzle by means of the outlet openings 33.

Since the nozzle housing of the rotor nozzle according to the invention is also formed by the outer cap 27, which must withstand only a small proportion of the pressure prevailing in the rotor chamber 17 fluid pressure, the outer cap 27 can be made of a material which has a low weight, whereby the dead weight of the rotor nozzle minimized becomes.

Finally, the connecting portion 29 provides a comparatively large axial length for the screw thread for coupling the outer cap 27 to the terminal support 25.

The embodiment of Fig. 2 corresponds substantially to the embodiment of Fig. 1 , so that reference is made to the corresponding statements. The drilled hole and the outlet openings are in Fig. 2 not shown.

The terminal portion 45 is different from the embodiment of FIG Fig. 1 not designed as a relatively short screw socket, but as a plug-in portion, which makes it possible aufzustecken a particular designed as a hose fluid supply line to the comparatively long connection portion 45.

Also in the embodiment of Fig. 3 a relatively long connection portion 45 is provided, which is designed as a plug-in section for a fluid supply line formed in particular by a hose.

From the embodiment of Fig. 2 the rotor nozzle differs from the Fig. 3 essentially by the size. The rotor nozzle of the Fig. 3 is bigger than the one of Fig. 2 , in turn, larger than the rotor nozzle according to Fig. 1 is.

What the particular in the introductory part as well as in connection with the embodiment of Fig. 1 mentioned special features and advantages of the rotor nozzle according to the invention, so these statements apply equally to the rotor nozzles according to Fig. 2 and Fig. 3 ,

LIST OF REFERENCE NUMBERS

15

outlet

17

rotor chamber

19

camp

21

rotor

23

longitudinal axis

25

Connection and support member

27

outer cap

29

connecting portion

31

blowing hole

33

outlet opening

35

annulus

37

sealing area

39

sealing area

41

inlet space

43

inlet channel

45

connecting section

47

shoulder

Claims (9)

1. A rotor nozzle, in particular for high pressure cleaning devices,
   having a nozzle housing which has an inlet opening at its axially one end and an outlet opening (15) for a fluid, in particular water, at the other end,
   having a rotor (21) which is arranged in a rotor space (17) of the nozzle housing, which is supported at a bearing (19) by its front end facing towards the outlet opening (15) and which can be flowed through at least in part by the fluid, which rotor can be set into rotation about a longitudinal axis (23) by fluid flowing into the rotor space (17) and which is inclined towards the longitudinal axis (23) at least in the rotating state; and
   having a connector and carrier member (25) which is formed for connecting the rotor nozzle to a fluid supply line, on the one hand, and is formed as a carrier for an outer cap (27) of the rotor nozzle, on the other hand,
   wherein the connector and carrier member (25) includes a connection section (29) at which the outer cap (27) can be coupled to the connector and carrier member (25), in particular by screwing; and
   wherein the rotor space (17) is bounded at least partly by the connection section (29) in the radial direction with respect to the longitudinal axis (23),
   characterised in that
   the connector and carrier member (25) and the outer cap (27) together bound a ring space (35) into which the fluid flows and from which the fluid moves via at least one drive bore (31) into the rotor space (17) and to the outside via at least one discharge opening (33).
2. A rotor nozzle in accordance with claim 1,
   characterised in that
   the connection section (29) extends over more than a quarter of the axial length of the rotor space (17), with in particular the connection section (29) extending over more than half the axial length of the rotor space (17).
3. A rotor nozzle in accordance with claim 1 or claim 2,
   characterised in that
   the connection section (29) is open to the front, with preferably a front opening of the connection section forming the outlet opening (15) or leading to the outlet opening (15).
4. A rotor nozzle in accordance with any one of the preceding claims,
   characterised in that
   the connection section (29) is formed substantially cylindrical at least in the region of the rotor space (17); and/or in that the inner side of the connection section (29) is formed as a support surface, a roll-off surface and/or a rolling-off surface for the rotor (21), in particular for a rear end region of the rotor (21).
5. A rotor nozzle in accordance with any one of the preceding claims,
   characterised in that
   the outer side of the connection section (29) is provided with a thread for screwing to the outer cap (27).
6. A rotor nozzle in accordance with any one of the preceding claims,
   characterised in that
   at least one drive bore (31) for the fluid communicating with the rotor space (17) is formed at the connector and carrier member (25); and/or in that at least one outwardly opening discharge opening (33) for the fluid is formed at the connector and carrier member (25) and serves for expelling a cleaning jet and/or drive jet; and/or in that the connection section (29) is free from discharge openings with the exception of an opening forming the outlet opening (15) or leading to the outlet opening (15).
7. A rotor nozzle in accordance with any one of the preceding claims,
   characterised in that
   at least one fluid space (35), which is jointly bounded by the connector and carrier member (25) and the outer cap (27) is sealed at at least two sealing regions (37, 39) spaced apart from one another in the axial direction, with preferably one sealing region (39) being formed at least partly by a screw thread between the outer cap (27) and the connection section (29) of the connector and carrier member (25).
8. A rotor nozzle in accordance with any one of the preceding claims,
   characterised in that
   all the discharge openings (33), with the exception of the outlet opening (15), opening into the rotor space (17) and outwardly are formed at the connector and carrier member (25); and/or in that the outer cap (27) is free of additional discharge openings, with the exception of the outlet opening (15).
9. A rotor nozzle in accordance with any one of the preceding claims,
   characterised in that
   the connector and carrier member (25) is formed in one piece; and/or in that the outer cap (27) is manufactured from plastic.

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