DE2340469A1 - FLUID-OPERATED FREE JET BREAKER - Google Patents

Description

Munich, August 2, 1973 TP11- Pd / St

-1119-

KNORR-BREMSE G. m. B. H. 8 Munich 40, Moosacher Strasse 80

"Fluid-powered free jet breaker switch."

The invention relates to a fluid operated Free jet circuit breaker switch with two opposing each other in a housing gap at a predetermined distance Nozzles, of which one (main nozzle) is directly via a main channel and the other (inflow nozzle) via a branch duct branching off from the main duct and having a fluid resistance to a branch duct Fluid pressure source connected and at the inlet nozzle behind the fluid resistance in the direction of flow seen a scanning channel is arranged.

Such free jet interrupter switches work so that from the two opposite main and Flow nozzles free jets emerge, which meet in the free space between the nozzles and there one

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Form stagnation point. The fluid resistance upstream of the inlet nozzle is selected such that the stagnation point is set directly in front of the inlet nozzle «

If the free jet emerging from the main nozzle is now caused by external influences, e.g. by a solid object or is interrupted or disturbed by a free jet hitting the price beam across the beam, the The price jet emerging from the inlet nozzle is no longer due to the counter-flowing price jet or in one stowed to a much lesser extent. The result is that the pressure in the inflow channel is considerable decreases and thereby the fluidic amplifier connected to the inflow channel, for example an OR / NOR element, to the Response is brought.

However, it is disadvantageous in the known switches of the type mentioned that at the outer edge zones There are negative pressure zones of the nozzles, according to which, after a long period of operation, along the edge zones Build up dirt deposits that impair the puncture and operational safety of the switches.

The object of the invention is to provide a price beam sub-holder of the type mentioned at the beginning

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den that it.ergesteirtjp.st that it is to the external No dirt deposits can form in the belt zones of the nozzles even after long periods of operation.

This object is achieved in such a way that the outer walls of the housing gap are within an area close to the nozzle connect at least approximately in a streamlined manner to the nozzle orifice.

Advantageous designs are to be found in the subclaims remove.

Various exemplary embodiments according to the invention are shown schematically in the drawings. Herein shows

Fig. 1 shows a section of a conventional free jet interrupter switch with drawn Flow lines,

2 shows a section from a free jet interrupter switch according to the invention in one first embodiment,

5 shows a partial section from FIG. 2 on an enlarged scale Depiction,

3a shows a free jet interrupter switch according to the invention in cross section,

4- he switches another free jet interrupter according to the invention without inserted nozzle bodies,

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5 shows a section through a further embodiment sform according to the invention and

6 shows a section through an embodiment similar to that of FIG.

In Fig. 1 there is only one main gland 1 and one opposite one Inflow nozzle 2 of a known free jet interrupter switch shown. The one from the main jet The outflowing flow passes transversely through the housing gap 3 in the direction of the inlet nozzle 2.

The flow emerging from the inlet nozzle 2 in turn reaches the main nozzle 2.

In the vicinity of the outflow opening of the inflow nozzle 2 is formed due to the currents that meet one another a stagnation point 4 from the two nozzles, opposite which the stream filaments of the currents diverge laterally. The circulating marginal currents that form in the immediate vicinity of the outflow edge of the inlet nozzle 2 lead to dead flow zones at the outlet edge of the nozzle, in which dirt or dust deposits can be found can settle that have been dragged out of the housing gap. Such dust deposits can lead to a narrowing of the nozzle outlet and create the risk of entry into the inlet nozzle and the subsequent scanning channel, which is often connected to a special

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ders dust-sensitive fluidic flow amplifier is connected.

Similar ground currents are entrained by the exiting main flow at the exit point of the main nozzle 2, also dead flow zones 6 on the circumference of the outlet edge of the main nozzle are present, in which there is a build-up of dust. ^

The invention was based on the idea of increasing the operational safety of the free jet interrupter switch surprisingly easy way to be able to increase significantly, by choosing a construction in which the aforementioned dead flow zones do not exist.

In Fig. 2, an embodiment according to the invention is shown. Here, the outer walls of the Housing gap within an area close to the nozzle at least approximately flow line-shaped to the nozzle mouth. In the example case, the flow nozzle 7 a protruding nozzle attachment 8 which tapers conically on the outside in the flow direction. In the example case the inflow nozzle 7 is part of an insert body 9 »which is broken off into a bore 10 in the housing of the .chen shown free jet interrupter switch is pressed.

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The edge of the bore 10 is chamfered to form an obliquely inwardly extending surface 11 and adjoins it a surface section 12 running perpendicular to the axis of the nozzle 7, which in turn is connected to the conical surface 13 of the nozzle approach 8 is adjacent. In this way, the surfaces 11, 12, 15 are essentially streamlined Lined up in a row, so that in the area of the outlet edge of the inflow nozzle 7 there is no dead flow zones occur in which dust particles can be deposited from the gap 14- between the inlet nozzle 7 and the opposite main nozzle 15 entrained will.

The main nozzle 15 is essentially like the inflow nozzle 7 and is also located in an insert part 16 in a bore 17 with the bore edge 18 gripped.

Fig. 3 shows the flow nozzle 7 in the insert 9 according to Fig. 2 in an enlarged view. The insert part contains a through hole 19 which extends transversely to the nozzle 7 extends and is connected to the nozzle 7. In an arm 20 of the free jet interrupter switch is located a scanning channel 21 which is connected to a fluidic amplifier (not shown) and which is used in the Position of the insert 9 adjoins the bore 19. The insert 9 'is in the bore 10

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compared to the surface 22 of the housing gap of the free jet interrupter switch so set back that the mouth of the nozzle attachment 8 does not extend over the extended surface 22 protrudes.

The insert part 9 can consist of metal or plastic ". It is advantageously pressed into the bore 10.

The insert parts for the main and the inflow nozzle can be in their. outer surface dimensions for simplification exactly the same as the production. Advantageously, however, the egg a larger outer diameter than the insert part having the main gland to avoid confusion to be avoided during assembly, as the inlet nozzle advantageously has a larger cross section than the main nozzle having.

Fig. 3a shows a free jet interrupter switch according to the invention in cross section. The housing 23 forms two parallel arms 24 and 25, between which a free scanning gap 26 is located. In the front ends of the arms 24 and 25 there are holes 2? and 28, into which insert parts 29 and 30 are pressed. The insert part 29 comprises a flow nozzle 31 ″ and cLas Insert part 30 comprises a main nozzle 31 '. The two nozzle

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axes coincide and extend transversely to the scanning gap 26. This is the cross section of the inlet nozzle 31 chosen to be somewhat larger than the cross section of the main nozzle 31 '. The insert parts 29 and 30 each have continuous Cross bores 32 and 33, each on the nozzle Connect 31 '"and 31. The ones pointing to the scanning gap 26 Edges of the bores 27 and 28 are respectively corresponding Fig. 2 and 3 chamfered. The surfaces of the insert parts adjoining the nozzle orifices are corresponding to the Insert formed in Fig. 2, 'so that to the nozzle mouths Connect walls designed in the shape of a flow lens.

There is a first longitudinal bore in the housing which extends from the rear housing part to the bore 27.

There is also a second longitudinal bore 35 'in the housing, which extends from the front end of the housing from in one arm 25 to about the middle of the housing extends. In addition, a third hole is located in the housing, slightly offset from the second hole arranged hole 36 »which extends from the rear Housing end extends from up to a transverse bore 37, which extends from one side of the housing and the two Longitudinal bores 35 and 36 connects to one another. A further transverse bore 38 is provided coaxially to the transverse bore 37. Both transverse bores 37 and 38 end in the

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Housing at a distance from each other and are through a narrow throttle bore 39 connected, which represents a certain flow resistance. The exits of the cross bores 37 and 38 and the longitudinal bore 32 are through Balls pressed in flush with the outside tightly sealed. The longitudinal holes are on the rear of the housing 3-4 and 36 smart: · chnipple connected. The hose nipple 40 forms a connection to a flow amplifier, which is not shown here, and the hose nipple 39 forms a further connection to a flow source.

Since the transverse bores 32 and 33 of the insert parts 29 and 30 are each aligned with the longitudinal bores 34 and 35, the main nozzle 31 'is direct via the bores 33 and 34 and the inflow nozzle y \ via the bores 35 »37 and 38 and the flow resistance switched on 39 connected to the flow source. In addition, the inflow nozzle y \ is connected to the flow amplifier, not shown, via the bores 35 »37 and 36.

The free jet interrupter switch according to the invention can particularly be used in the above-described manner easy to manufacture. The insert parts 29, 30 with the nozzles 31, 31 'can consist of metal or plastic and are advantageously pressed into the bores 27, 28. The opposing

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th nozzle orifices not beyond the housing surfaces delimiting the scanning gap, so that the nozzles inside of the scanning gap are arranged particularly protected, whereby the operational reliability of the inventive Free jet interrupter switch is increased.

As above in connection with Figures 2 and described, thanks to the special streamlined Design of the surface parts adjoining the nozzle mouths are not present at the nozzle mouths Deposit more dust particles that are carried away from the scanning channel.

Fig. 4 shows another free jet interrupter switch 41 according to the invention in cross section, similar to that of FIG. 3a. The switch 41 is modified here in such a way that that the scanning gap 4-2 does not extend longitudinally but in the transverse direction to the switch. The insert parts comprising the nozzles are not shown here.

In the free housing arm 45 ″ there is a continuous one Transverse bore 43 for inserting an insert part that includes the inflow nozzle, corresponding to the insert part 29 in Fig. 3a. Located coaxially to the transverse bore 43 There is a further bore 44 in the housing for inserting an insert part comprising the main nozzle the insert part 30 in Fig, 3a.

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The bore 44 is in communication with a narrower bore 46 to which a flow source can be connected comes. The bore 46 is crossed by a transverse bore 47 which extends from one side of the housing and is coaxial to another cross hole .43, which starts from the other side of the housing. Both holes 47 and 48 are connected by a narrow throttle bore 49. Longitudinal bores 50 and 51 branch off from the transverse bore 48, on the one hand from the rear side and on the other are drilled from the front of the case. The bore 50 is connected to a flow amplifier, not shown brought to the connection. The bore 51 is crossed by a transverse bore 52 and extends in the arm 45 up to the bore 43.

The chamfered edges of the insert parts receiving bores 41 and 44 are advantageously by a Bore 55 made its axis in a central plane 54 lies through the scanning gap 42 essentially at the intersection of the axes of the bores 43 and 44, the diameter of the bore 53 being larger than the diameter of the scanning gap 42.

In the case of the free jet interrupter switch according to the invention, the main nozzle is thus above the bores 47 and 46 and the inlet nozzle via the bores 52, 5 ^ 1 4-8,

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5 0 9 8 0 B / Π fi 0 }

the throttle 49 and the bores 47 and 46 with the flow source in connection. In addition, the inlet nozzle is over the bores 52, 51 »4-8 and 50 with a Flow intensifier in connection.

It is clear that the bores 47, 48 and 52 to the outside are blocked, for example, by flush pressed-in balls.

The bores 43 and 44 advantageously have different ones Diameter, and accordingly have the individual insert parts with the main or the Inflow nozzle on different diameters so that no mix-ups occur when assembling the insert parts can.

Fig. 5 shows only the ends of two housing arms of a free jet interrupter switch according to the invention similar to that of Fig. 3a. In contrast to this embodiment, the insert parts in FIG. 5 exist directly seen from nozzle bodies in the form of codes Pipe sections 55> 56 which are inserted into transverse bores 57, 58 which intersect with longitudinal bores 59, 60 corresponding to the longitudinal bores 34, 35 in Fig. 3a. The pipe section 55 with the narrower inner diameter Lildci, dir Iiauptdüe and the pipe section 56 with

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the inlet nozzle comprises the further inner diameter. Both pipe sections 55 and 56 can be different Have outside diameter and accordingly the bores 57 and 58 can have different diameters, to avoid mixing up the nozzles.

The pipe sections 55 and 56 contain tapered heads on the head side Edge sections, which are streamlined, to which delimit the scanning gap 61 between the housing arms Connect housing surfaces 62 and 63. So that the nozzle orifices were protected in the scanning gap here as well At the front ends of the housing arms 59 and 60, projections 64 and 65 pointing towards the scanning gap are provided available, each of which protrudes slightly beyond the nozzle orifices in question. The pipe sections 55 and 56 can be made from Made of metal or plastic.

FIG. 6 shows a further embodiment according to the invention similar to that according to FIG. 5, in which the corresponding pipe sections 55 and 56 are protected with their head ends in edge depressions. These edge depressions are formed by a bore 66 corresponding to the bore 53 in FIG.

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Claims (8)

Claims Ό Fluid-operated free-jet circuit breaker with two nozzles facing each other in a housing gap at a predetermined distance from which one (main nozzle) directly via a main channel and the other (inflow nozzle) via one of the Main channel branching off, a branch passage including a fluid resistance to a fluid pressure source connected and on the inlet nozzle behind the fluid resistance in the direction of flow seen a scanning channel is arranged, characterized in that the outer walls of the housing gap within an area close to the nozzle, at least approximately in a streamlined manner to the nozzle mouths connect. 2. Switch according to claim Λ, characterized in that nozzle insert parts are present which each have a central crucible-shaped protruding nozzle attachment and a transverse channel to the nozzle axis and communicating with the nozzle, which is connected to a housing channel. 3. Switch according to claim 1, wherein the main and the scanning channel is provided with cross bores - 15 - 509808/0609 are, the axes of which cross the housing gap coaxially to each other, characterized in that the nozzle-forming tubular inserts into the bores intervene on the muzzle side with a outer conical edge are provided, the streamlined adjoins the housing surfaces delimiting the scanning gap. 4. Switch according to claims 1 and 2, characterized in that the insert parts in the recesses are set back from the housing gap. 5. Switch according to one of claims 1 to 4, characterized in that the edges of the recesses for Formation of sloping inward ■ surface sections are chamfered, which are streamlined connect to the surfaces of the insert parts. 6. Switch according to claim 5, characterized in that that the chamfered sand of the recesses having the insert parts form walls of a bore Their axis in a central plane through the gap essentially at the intersection of the axes of the bores for the insert parts. π η 9 " 7. Switch according to one of claims 1 to 6, characterized in that the insert parts are made of metal
or plastic, which have a Prfisssitz in the recesses designed as bores. 8. Switch according to one of claims 1 to 7, characterized in that each of the main and the inflow nozzle comprising insert parts are different
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