DD284948A5 - lance - Google Patents

Abstract

Jet pipes of this type are used in particular for processing contaminated earth. High costs for the exchangeable parts result from wear and the period of inoperation. The object is to design the jet pipe in such a way that the periods of inoperation are reduced and the wear lessened. The jet pipe (1) has an inlet (2), a section (3) adjoining the latter and having outlet openings arranged about the inside of the tube in the circumferential direction, and a conical tube section (5) adjoining the section (3). The conical tube section (5) is designed as a tube insert which can be inserted separately from the section (3). <IMAGE>

Description

lance

Anwendungsgebiet_der_Erfindung

The invention relates to a jet pipe according to the preamble of claim 1.

Such a jet pipe is known from DE-PS 21 50 711. In this, the adjoining the input section and the conical tube section are connected by screws. When using such a jet pipe, high pressure V / asser is supplied via the feed nozzle, which enters the interior of the pipe via the outlet openings in the direction of a conical jacket. As a result, a sand or earth-water mixture is sucked in on the input side and passed through the water cone jacket. In this case, a turbulence occurs, which causes the conical portion and the outlet openings having areas of heavy wear; In particular, when two such radiant tubes are to be connected in cascade-like fashion, an exchange of worn parts leads to considerable downtime.

From DD 153 905 a multi-stage jet pump is known, in which, however, each subsequent to a diffuser section is cylindrical or divergent. The individual steps can be connected by screws. From US-PS 2 396 290 a multi-stage jet pump is known in which the adjoining the diffuser sections are divergent or cylindrical. Individual sections of the device can be connected by screwing together.

Ζ ^ β1_αβΓ_ΕΓfindung

The object of the invention is to form such a jet pipe, in which the wearing parts are easily replaceable. Preferably, the jet pipe should be formed so that in addition the wear is reduced.

He invention

This object is achieved by a characterized in claim 1 jet pipe.

Developments of the invention are in the (Jent teransprchen marked t.

Further features and advantages of the invention will become apparent from the description of an embodiment with reference to FIGS. From the figures show:

1 shows a section through a jet pipe with two cascade-like jet pipe sections arranged one behind the other;

Fig. 2 is a side view of a jet pipe with explosively exploded parts;

Fig. 3 is a view of the jet pipe shown in Fig. 2 from the input side; and

4 shows a detail from FIG. 1.

The jet pipe 1 has a connectable to a supply line 2 for supplying a medium to be sucked section 3, a jet pipe housing 4 and extending in the interior of a conical pipe section 5.

The section 3 is formed as a ring 6. It has a supply pipe 7 which can be connected to a line which supplies a pressurized fluid medium and in particular water-supplying line. Further, on a in daj pipe interior erstrekkenden and inclined against the tube axis surface 8 circumferentially staggered outlet nozzles are provided whose axes are aligned so that from them escaping water flows to a common axial point 10 in the tube interior and thus a conical water jacket 11th forms. The outlet nozzles and the supply nozzle are connected to each other via a channel 12 extending in the circumferential direction in the ring.

The jet pipe housing 4 has on the input side a first connection 13 and on the output side an outlet connection 14. Inside, the two stubs are formed so that the conical tube section 5 can be inserted into the jet tube housing 4 and is held coaxially by the two stubs. On the input side, the ring 6 is flanged coaxially by means of screws via an externally attached second annular flange 15. Via a further flange 16, the supply line is connected to the section 3.

In the embodiment shown in FIG. 2, in which two jet pipe sections 15 and 17 are arranged one behind the other, the output side flange 14 of the jet pipe section 16 arranged in front of it serves for mounting the ring 6 belonging to the jet pipe section 17.

The conical pipe section 5 is formed so that its output end Sich's so far into the section 3 of the subsequent jet pipe section extends into that seen in radial projection, the outlet nozzles 9 are covered. This prevents the nozzles from being ground and destroyed by the material passed through. At the input side of the first jet pipe section is a corresponding, not shown, in its shape to the end of

Inserted cone-shaped pipe section corresponding ring insert, which covers the local nozzles. It is also possible, instead, to allow the end of the supply line 2 protruding into the interior to protrude so far that the sucked-in material does not vortex directly past the nozzles.

As can be seen in particular from Figures 2 and 3, the jet pipe comprises a guide frame 18 with two lateral rails. The jet tube housing and the ring 6 have on both sides arranged pairs of wheels 21, 22; 23 on. With the help of these pairs of wheels, it is possible to replace a conical tube section 5 in a simple manner, the ring 6 after loosening flange bolts and take out the tube section 5 and replace. In the same way, if necessary, maintenance work on the outlet nozzles 9 can be carried out in a simple manner.

In the embodiment described above, water was supplied via the supply ports 7, respectively. However, it is also possible, if desired, to supply steam for better dissolution of certain constituents via one of the feed nozzles.

As can be seen from Fig. 1, further, at the input side between the supply line 2 and the ring 6, a free lip 24 forming ring 25 may be provided which, like the inwardly extended supply line 2 ensures that the nozzles are not damaged.

Claims (11)

1. jet pipe with a housing having an inlet for the medium to be sucked and an output side adjoining conical pipe section and a section adjacent to the input with arranged circumferentially around the pipe outlet openings for a high pressure medium to be supplied e.ingangsseitig via a channel a supply nozzle are connected, characterized in that the portion is formed as a replaceable ring (6). 2. jet pipe according to claim 1, characterized in that the ring (6) arranged at the outlet openings nozzles and one of these with the supply nozzle (7) connecting channel (12). 3. jet pipe according to claim 1 or 2, characterized in that the pipe section (5) and the ring (6) are used interchangeably. 4. jet pipe according to claim 3, characterized in that pipe section (5) and ring (6) between a fixedly connected to the housing first flange (15) and a second flange (13) connectable thereto are held. 5. jet pipe according to one of claims 1 to 4, characterized in that at least a first and a second corresponding jet pipe section are arranged in cascade one behind the other. 6. jet pipe according to claim 5, characterized in that the housing each having an output-side flange and that at the location of the connection of the first and second jet pipe section, the second flange is the output-side flange of the preceding jet pipe section. 7. jet pipe according to one of claims 1 to 6, characterized in that, the nozzles are covered towards the inside of the pipe by a shield (24). 8. jet pipe according to claim 7, characterized in that the shield is formed by an inner ring projecting into the ring. 9. jet pipe according to claim 8, characterized in that the inner ring is formed by the protruding into the ring output side end of the pipe section of an upstream jet pipe section. 10. jet pipe according to one of claims 3 to 9, characterized in that the jet pipe housing and / or ring have a laterally arranged pair of wheels for moving the parts together during the exchange. 11. jet pipe according to claim 10, characterized in that a guide frame is provided for guiding the pairs of wheels. Z strings drawings