EP3691950A1

EP3691950A1 - Flow device and method for controlling and/or adjusting a counter pressure in a pneumatic sand-conveying device for a rail vehicle, and sand-conveying device having a flow device

Info

Publication number: EP3691950A1
Application number: EP18783396.7A
Authority: EP
Inventors: Martin Schmid
Original assignee: Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Current assignee: Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Priority date: 2017-10-02
Filing date: 2018-10-01
Publication date: 2020-08-12
Anticipated expiration: 2038-10-01
Also published as: EP3691950B1; ES2898764T3; DE102017122859B3; PL3691950T3; WO2019068598A1

Abstract

A flow device (110) for controlling and/or adjusting a counter pressure (115) in a pneumatic sand-conveying device (105) for a rail vehicle has at least one conveying channel device (200) and a controllable counter pressure device (205). The conveying channel device (200) is formed to convey sand (210). The controllable counter pressure device (205) is coupled to the conveying channel device (200), and arranged and/or formed to generate the counter pressure (115) against and/or perpendicular to a conveying direction (215) of the sand (210) conveyed in the conveying channel device (200), or against and/or perpendicular to an intended conveying direction (215) of the sand (210) that can be conveyed in the conveying channel device (200).

Description

DESCRIPTION

Flow device and method for controlling and / or adjusting a back pressure in a pneumatic sand conveyor for a

Rail vehicle and sand conveyor with a flow device

The present approach relates to a flow device for controlling and / or adjusting a back pressure in a pneumatic sand conveyor device for a rail vehicle, a method for controlling and / or adjusting a

Counterpressure in a pneumatic sand conveyor for a rail vehicle and a sand conveyor with a flow device.

In pneumatic sand conveyors, a conveyed amount of sand is varied over a conveying air mass flow and emptying a sanding pipe of the

Sand conveying device by means of a blower with pointing in the flow direction of the sand channels.

Against this background, the object of the present approach is an improved flow device for controlling and / or adjusting a back pressure in a pneumatic sand conveyor device for a rail vehicle, an improved method for controlling a back pressure in a pneumatic

To provide a sand conveyor for a rail vehicle and a sand conveyor with an improved flow device.

This object is achieved by a flow device for controlling and / or adjusting a back pressure in a pneumatic sand conveyor for a

Rail vehicle, a method for controlling and / or adjusting a back pressure in a pneumatic sand conveyor device for a rail vehicle and a sand conveyor device with a flow device according to the main claims solved. Subject of the present approach is also a computer program.

Advantageous embodiments and further developments of the approach will become apparent from the following subclaims. By means of a flow device presented here, it is advantageously possible to set a conveyed sand mass flow in a sand conveying device and / or to control or regulate it by varying a counterpressure. Also, at least a part of a conveyor channel device or a complete sanding pipe of the

Sand conveyor be emptied by the flow device quickly and easily.

A flow device for controlling a back pressure in a pneumatic sand conveyor device for a rail vehicle has at least one

Delivery channel device and at least one controllable counter-pressure device. The conveying channel device is shaped to convey sand. For example, the conveying channel device may be a sanding pipe or a section of a sanding pipe of the sand conveying device. The controllable

Counter-pressure device is coupled to the conveying channel device and arranged and / or formed to counter-pressure and / or perpendicular to a conveying direction of the conveyed in the conveyor channel device sand or against and / or perpendicular to an intended conveying direction of the conveyable in the conveyor channel device sand, the back pressure ,

For example, the tubular conveying channel device at one end an interface and at one end opposite the end another

Form out interface. The interface may be arranged in a received state of the flow device in the sand conveyor device facing a compressed air connection of the sand conveyor and, for example, be fluidly connected to a vacuum chamber or mixing chamber of the sand conveyor. The interface arranged opposite the other interface can be arranged facing an exit of the sand conveyor, through which the sand leaves the sand conveyor. The controllable

Counterpressure device can accordingly be arranged and / or be formed to counterpressure in the direction of the compressed air connection and thus counter to the conveying direction of the in the

Produce conveyor channel means subsidized or recoverable sand. The controllable counter-pressure device can for generating the counterpressure at least one injection device for blowing air into the

Have conveyor channel device. In this case, the injection device to do so

be formed to inject the air in a blowing direction, which has at least one component opposite or perpendicular to the conveying direction or the intended conveying direction to generate the back pressure. Such

Einblaseinrichtung can by blowing in the air a suitable and

generate controllable back pressure.

According to an advantageous embodiment of the approach presented here, the controllable counter-pressure device for guiding the air counter to or perpendicular to the conveying direction or the intended conveying direction at least a first

Nozzle unit which between the injection device and the

Delivery channel device is arranged and the injection device fluidly with the

Conveying channel device connects. This first nozzle unit can be formed, for example, as a substantially straight shaped connecting tube. If the first nozzle unit is arranged transversely to the conveying channel device, this allows an inflow of air into the conveying channel device counter to the conveying direction of the sand. If the first nozzle unit is arranged perpendicular to the conveying channel device, this allows the inflow of air into the conveying channel device perpendicular to the conveying direction of the sand.

In order to allow more air to flow into the conveying channel device in order to be able to generate a greater back pressure, the controllable counterpressure device can have at least one second nozzle unit, in particular wherein the second

Nozzle unit can be connected to the injection device and / or a further injection device. Also, the second nozzle unit can transverse to the

Delivery channel device, in particular be arranged perpendicular to the conveyor channel device. To a uniform influx of air in the

To allow delivery channel device, the second nozzle unit may be fluidly connected to the conveyor channel device on one of the first nozzle unit opposite side of the conveyor channel means. If the controllable counterpressure device additionally has at least one third nozzle unit which is fluidically connected to the delivery channel device, this can allow an even higher counterpressure. The third nozzle unit can in this case be arranged in particular between the first nozzle unit and the second nozzle unit and / or with the injection device or an additional one

Be connected inflation device.

Additionally or alternatively to the introduced blowing device and / or the

Nozzle units, the controllable counter-pressure device may also comprise at least one pinch valve, which is adapted to by changing the

Cross section of the conveyor channel device to generate the back pressure. Also, by such a pinch valve, the back pressure can be generated quickly and easily controllable.

In order to enable automated control of the backpressure, the controllable back pressure device may advantageously be designed to generate the back pressure in response to a sensor signal. For example, the controllable counter-pressure device may be designed to be in response to the sensor signal of an air mass flow sensor and / or a pressure sensor

To generate back pressure. This air mass flow sensor and / or the pressure sensor can be arranged in the region of a sand container of the sand conveyor. In this case, the sensor signal of the air mass flow sensor can represent a volume flow measured in the region of a sand container. The sensor signal of the pressure sensor can represent a detected in the region of the sand tank pressure loss.

A sand conveying device has a flow device, which is embodied in an embodiment presented here. The sand-conveying device may be a pneumatic sand-conveying device, which is shaped to be received in a rail vehicle. A sand conveying device presented here can serve as a substitute for known sand conveyors, the here presented Sand conveying device realizes the advantages of the flow device thanks to the flow device.

A method for controlling and / or adjusting a back pressure in a pneumatic sand conveyor for a rail vehicle comprises at least the following steps:

Providing a conveying channel device for conveying sand and a controllable counterpressure device coupled to the conveying channel device; and

Generating a back pressure by blowing in air against and / or perpendicular to a conveying direction of the conveyed in the conveyor channel device sand or against and / or perpendicular to an intended conveying direction of the conveyable in the conveyor channel device sand by the controllable

Counterpressure device.

This method can be performed using the previously presented

Flow device be executable. Also by such a method, the already described advantages of the flow device can be realized technically simple and inexpensive.

Also of advantage is a computer program product or computer program with program code which can be stored on a machine-readable carrier or storage medium such as a semiconductor memory, a hard disk memory or an optical memory and is used to carry out, implement and / or control the steps of the method, in particular if Program product or program is executed on a computer or a device.

Embodiments of the approach presented here are explained in more detail in the following description with reference to the figures. Show it:

Fig. 1 is a schematic cross-sectional view of a rail vehicle with a pneumatic sand conveyor device with a flow device for Controlling and / or adjusting a back pressure in the sand conveyor according to an embodiment;

Fig. 2 is a schematic cross-sectional view of a sand conveyor with a

Flow device according to an embodiment;

Fig. 3 is a schematic side view of a flow device according to a

Embodiment;

Fig. 4 is a schematic side view of a flow device according to a

Embodiment; and

5 is a flowchart of a method for controlling and / or adjusting a back pressure in a pneumatic sand conveyor for a

Rail vehicle according to an embodiment.

In the following description of favorable embodiments of the present approach, the same or similar reference numerals are used for the elements shown in the various figures and similar acting, with a repeated description of these elements is omitted.

If an exemplary embodiment includes a "and / or" link between a first feature and a second feature, this is to be read such that the

Embodiment according to an embodiment, both the first feature and the second feature and according to another embodiment, either only the first feature or only the second feature.

1 shows a schematic cross-sectional illustration of a rail vehicle 100 having a sand conveyor device 105 with a flow device 110 for controlling and / or setting a counterpressure 15 in the sand conveyor device 105 according to one exemplary embodiment.

The sand conveyor 105 is formed in this embodiment as a pneumatic sand conveyor 105 and disposed in the rail vehicle 100. The flow device 110 is part of the sand conveying device 105 and designed to counteract and / or counterpressure in the pneumatic sand conveying device 100 by means of a controllable counterpressure device perpendicular to a conveying direction of the conveyed in the flow device 1 10 sand or against and / or perpendicular to an intended conveying direction of the flowable in the flow device 1 10 to be generated sand. FIG. 2 shows a schematic cross-sectional view of a sand conveyor device 105 with a flow device 110 according to one exemplary embodiment. It may be an embodiment of the described with reference to FIG

Sand conveyor 105 act. For controlling and / or adjusting the back pressure 1 15, the flow device 1 10 has at least one delivery channel device 200 and the controllable

Counterpressure device 205 on. The conveyor channel device 200 is shaped to convey sand 210. The controllable counter-pressure device 205 is connected to the

Delivery channel device 200 is coupled and arranged and / or formed to counter to or according to an alternative embodiment perpendicular to the

The direction of conveyance 215 of the sand 210 conveyed in the conveying channel device 200 or counter to and / or perpendicular to an intended conveying direction 215 of the sand 210 which can be conveyed in the conveying channel device 200, is to produce the back pressure 15. In addition to the flow device 1 10, the sand conveyor device 105 according to this embodiment, a compressed air connection 220, a Druckeinstellschraube 225, a motive nozzle 230, a vacuum chamber 235, intake ports 240, a sand container 250, an adapter 255, a Laval nozzle 260 and Zuluftkanäle 265 on. Via the compressed air connection 220 compressed air is in the pneumatic

Blown sanding device 105. A pressure can here according to this

Embodiment about the Druckeinstellschraube 225 can be adjusted. The

Compressed air then flows via the motive nozzle 230 into the vacuum chamber 235, whereby via the suction channels 240 due to the Venturi effect or in the vacuum chamber 235 forming negative pressure of the sand 210 from the

Sand container 250 and the adapter 255 is sucked. The sand 210 is lowered via the optional Laval nozzle 260, which increases a flow rate, via the delivery channel device 200, which also serves as a transport line can be designated, transported away. Via the supply air ducts 265, a pressure equalization can take place, that is, the air sucked through the intake ducts 240 flows over the supply air ducts 265. The flow direction of the air is indicated in FIG. 2 by arrows.

In the present case, a backpressure can be understood to mean a pressure which is counteracted by a counterflow of air, that is to say by an air flow

Main air flow is aligned. In this case, the counterflow of air can lead to a decrease in the pressure or the volume flow of the main air flow. For example, the back pressure may be the pressure in a delivery channel device 200, which is composed of the pressure which is bent by a nozzle 230 and the pressure which is generated by a nozzle unit 280.

The features described below of the flow device 1 10 presented here can be implemented separately or together in different exemplary embodiments:

According to this exemplary embodiment, the flow device 110 is arranged on an underside of the sand conveyor 105 in an operative state of the sand conveyor 105 shown here. For this purpose, the tubular forms

Delivery channel device 200 at one end an interface and at one end opposite the end of another interface 270 from. The interface is arranged facing the compressed air port 220 of the sand conveyor 105 and fluidly connected thereto. The interface 270 arranged opposite the interface is arranged facing an exit of the sand conveyor 105, through which the sand 210 leaves the sand conveyor 105. The controllable counter-pressure device 205 is accordingly arranged and shaped to the counter pressure 1 15 in the direction of the compressed air port 220 and thus against the generated by the compressed air port 220

To produce conveying direction 215 of the conveyed in the conveyor channel device 200 or recoverable sand 210. The controllable counter-pressure device 205 has according to this embodiment, at least one injector 275 for blowing air into the

Delivery channel means 200, wherein the injection means 275 is adapted to inject the air in a blowing direction, the at least one component opposite and / or according to an alternative embodiment perpendicular to the conveying direction 215 or the intended conveying direction 215 to the counter-pressure 1 to 15 produce.

In addition, the controllable counter-pressure device 205 for guiding the air has at least one first nozzle unit 280, which is located between the injection device 275 and the

Delivery channel device 200 is arranged and the injection device 275 fluidly connected to the conveyor channel device 200.

Optionally, the controllable counter-pressure device 205 according to this

Embodiment, a second nozzle unit 285, in particular wherein the second nozzle unit 285 is connected to the injection device 275.

The nozzle units 280, 285 are arranged transversely to the conveyor channel device 200. According to an alternative embodiment, one of the nozzle units 280, 285 or both nozzle units 280, 285 is arranged perpendicular to the conveyor channel device 200. According to this embodiment, the second nozzle unit 285 is on a side opposite to the first nozzle unit 280

Delivery channel device 200 fluidly connected to the conveyor channel device 200.

The back pressure can be generated according to an embodiment by a spring pressure of a spring or a valve which are coupled to the nozzle unit 280, 285, for example, are fluidically coupled. The spring pressure can be generated in this case for example by a spring of a pressure reducing valve in combination with a compressed air generator.

According to an alternative embodiment, the controllable

Counterpressure device 205 additionally or alternatively to the injection device 275 and the nozzle units 280, 285 at least one pinch valve, which is designed to generate by changing the cross section of the conveying channel device 200, the back pressure 1 15. The controllable counter-pressure device 205 is designed to generate the back pressure 15 in response to a sensor signal. According to this

Embodiment, the controllable counter-pressure device 205 is designed to generate the back pressure 15 in response to the sensor signal of an air mass flow sensor and / or a pressure sensor.

In the following, embodiments of the flow device 1 10 are described again in other words:

The here presented flow device 1 10 advantageously allows a pneumatic control of a sand conveyor in the form of the sand conveyor 105 by varying the back pressure 1 15th

Unlike previously used pneumatic sand conveyors 105, in which a conveyed amount of sand 210 can be changed only by a variation of the amount of conveying air provided by the compressed air port 220, which disadvantageously also varies a transporting speed of the sand 210, the flow device 1 10 provided herein enables 10

Advantageously, changing the conveyed amount of sand 210 by generating the back pressure 1 15. In addition, advantageously no special blow-out devices are required by the presented flow device 1 10 to completely empty a sanding tube of the sand conveyor 105. It is therefore one

Control / regulation / adjustment of the conveyed sand mass flow as well as a

Stopping a sand extraction with simultaneous emptying of the conduit system in the form of at least the channel conveyor 200 and / or the Laval nozzle 260 and / or the vacuum chamber 235 allows.

By blowing in air, primarily but not exclusively against or perpendicular to the conveying direction 215, which may also be referred to as the main flow direction, in a separate injection device 275, which is connected downstream of a sand transport unit in the form of the sanding tube, with simultaneous injection of the conveying air through the compressed air port 220, a pressure in the vacuum chamber 235, which can also be referred to as a mixing chamber, and thus a lot of from the environment by the sand container 250 sucked air, which for the

Sand extraction is decisive, can be varied. As a result, ultimately the conveyed sand mass flow can be controlled. This sand mass flow can thus be reduced to a complete stop. The fact that the conveying air at supersonic speed from the driving nozzle 230, which can also be referred to as a delivery nozzle, flows into the vacuum chamber 235, the changes

Conveying mass flow not and the conveying speed of the medium is maintained. This can be used in particular for emptying the subsequent line system. Physically, this is based on that the system pressure within the vacuum chamber 235 is raised by varying the back pressure 15. In addition to the above-described counterpressure increase by blowing air, this can also be controlled by other controllable devices, eg. B. at least one of the already mentioned pinch valves can be achieved. Since additionally sucked from the environment by the sand container 250 air mass flow is measured directly via a volume flow meter and / or indirectly z. B. on a resulting pressure drop, so a closed control system is created.

The variation of the pressure in the vacuum chamber 235 can be achieved in this case particularly effectively if the air is blown in the opposite direction or, according to the alternative embodiment, perpendicular to the conveying direction 215 as in this embodiment.

FIG. 3 shows a schematic side view of a flow device 110 according to one exemplary embodiment. This may be an exemplary embodiment of the flow devices 1 10 described with reference to FIGS. 1 to 2, with the difference that in FIG. 3, an injection pointing perpendicular or at least almost perpendicular to the conveying direction 215 is shown. For this purpose, according to this embodiment, the nozzle units 280, 285 are arranged perpendicular or at least almost perpendicular to the conveyor channel device 200.

4 shows a schematic side view of a flow device 110 according to one exemplary embodiment. This may be an exemplary embodiment of the flow devices 110 described with reference to FIGS. 1 to 2, with the difference that the controllable counterpressure device according to this

Embodiment, a third nozzle unit 400 which fluidly with the

Delivery channel device 200 is connected, in particular wherein the third nozzle unit 400 between the first nozzle unit 280 and the second nozzle unit 285th

is arranged and connected to the injection device.

FIG. 5 shows a flowchart of a method 500 for controlling and / or adjusting a back pressure in a pneumatic sand conveyor for a

Rail vehicle according to an embodiment. This may be a method 500 that can be executed and / or controlled by one of the flow devices described with reference to the preceding figures.

The method 500 has at least one providing step 505 and one generating step 510. In step 505 of providing, a

Delivery channel device for conveying sand and provided with the conveyor channel device controllable counter-pressure device provided. In step 510 of the

Generating a back pressure against and / or perpendicular to a conveying direction of the conveyed in the conveyor channel device sand or against and / or perpendicular to an intended conveying direction of the conveyable in the conveyor channel means sand generated by the controllable counter-pressure device.

The method steps presented here can be repeated and executed in a sequence other than that described. LIST OF REFERENCE NUMBERS

100 rail vehicle

105 sand conveyor

1 10 flow device

1 15 back pressure

200 conveyor channel device

205 controllable counterpressure device 210 Sand

215 conveying direction

220 compressed air connection

225 pressure adjustment screw

230 motive nozzle

235 vacuum chamber

240 intake ports

250 sand containers

255 adapters

260 Laval nozzle

265 supply air ducts

270 more interface

275 blowing device

280 first nozzle unit

285 second nozzle unit

400 third nozzle unit

500 procedures

505 step of providing

510 step of creating

Claims

1 . Flow device (1 10) for controlling and / or setting a

Counterpressure (1 15) in a pneumatic sand conveyor device (105) for a rail vehicle (100), wherein the flow device (1 10) has at least the following features:

- A conveying channel means (200) for conveying sand (210); and

at least one controllable counterpressure device (205) coupled to the conveyor channel device (200), arranged and / or shaped to be opposite and / or perpendicular to a conveying direction (215) of the sand (210) conveyed in the conveyor channel device (200) opposite and / or perpendicular to an intended conveying direction (215) of in the conveying channel means (200) recoverable sand (210) to generate the back pressure (1 15).

2. flow device (1 10) according to claim 1, wherein the controllable

Counterpressure device (205) at least one injection device (275) for blowing air into the delivery channel device (200), wherein the injection device (275) is adapted to the air in a

Inject blowing direction, which has at least one component opposite to the conveying direction (215) or the intended conveying direction (215) to generate the back pressure (1 15).

3. flow device (1 10) according to claim 2, wherein the controllable

Counterpressure device (205) for conducting the air at least a first

Nozzle unit (280), which is arranged between the injection device (275) and the delivery channel device (200) and fluidly connects the injection device (275) with the delivery channel device (200).

4. flow device (1 10) according to claim 3, wherein the first nozzle unit (280) is arranged transversely to the conveying channel means (200).

5. Flow device (1 10) according to one of claims 3 to 4, wherein the first nozzle unit (280) is arranged perpendicular to the conveyor channel device (200).

6. flow device (1 10) according to one of claims 3 to 5, wherein the controllable counter-pressure device (205) at least a second nozzle unit (285), in particular wherein the second nozzle unit (285) with the injection device (275) is connected.

7. flow device (1 10) according to claim 6, wherein the second nozzle unit (285) on one of the first nozzle unit (280) opposite side of the conveying channel means (200) is fluidly connected to the conveying channel means (200).

8. flow device (1 10) according to claim 7, wherein the controllable

Counterpressure device (205) has at least one third nozzle unit (400) which is fluidically connected to the conveyor channel device (200), in particular wherein the third nozzle unit (400) is arranged between the first nozzle unit (280) and the second nozzle unit (285) and / or with the

Injection device (275) is connected.

9. flow device (1 10) according to one of the preceding claims, wherein the controllable counter-pressure device (205) at least one

Pinch valve, which is adapted to by changing the cross section of the conveying channel means (200) to generate the counter-pressure (1 15).

10. flow device (1 10) according to one of the preceding claims, wherein the controllable counter-pressure device (205) is adapted to generate in response to a sensor signal, the back pressure (1 15).

1 1. Flow device (1 10) according to claim 10, wherein the controllable counter-pressure device (205) is adapted to generate the counter-pressure (1 15) in response to the sensor signal of an air mass flow sensor and / or a pressure sensor.

12. sand conveying device (105) with a flow device (1 10) according to

one of the preceding claims.

13. A method (500) for controlling and / or adjusting a backpressure (15) in a pneumatic sand conveyor (105) for a rail vehicle (100), the method (500) comprising at least the following steps:

- providing (505) a conveying channel device (200) for conveying sand (210) and a controllable counterpressure device (205) coupled to the conveying channel device (200); and

- Generating (510) of a back pressure (1 15) by blowing air

against and / or perpendicular to a conveying direction (215) of the sand (210) conveyed in the conveying channel device (200) or counter to and / or perpendicular to an intended conveying direction (215) of the sand (210) conveyable in the conveying channel device (200) controllable counterpressure device (205).

A computer program configured to execute and / or control the method (500) of claim 13.