Metering device for a sand-spreading system of a rail vehicle

Patent metadata

Field	Value
Publication number	US-11273672-B2
Application number	US-201716500487-A
Country	US
Kind code	B2
Filing date	Dec 29, 2017
Priority date	Apr 3, 2017
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A metering device is configured for fitting into a sand-spreading system of a rail vehicle. The metering device has a housing block, in which a sand path extends from a sand-feeding funnel into a vertical sand blow-out channel via a sand-mixing channel, which rises at an inclination from a sand-holding space to a sand deflection space. A pushing air tube is provided for producing an air flow that conveys spreading sand. The pushing air tube protrudes into the sand-mixing channel coaxially from the bottom. A nozzle insert is detachable inserted into an inflow channel, which leads into the sand deflection space from above. The nozzle insert is provided for producing an air jet directed downward into the sand blow-out channel. The amount of scattering sand that is discharged can be metered more precisely and the susceptibility of the metering device to wear is improved.

First claim

The invention claimed is:

1. A metering device for a sand-spreading system of a rail vehicle, the metering device comprising:
a housing block defining a sand feeding funnel, a sand mixing channel, a sand receiving space, a sand deflecting space and a vertical sand blowing-out channel, said housing block including a sand path extending from said sand feeding funnel into said vertical sand blowing-out channel via said sand mixing channel, said sand mixing channel rising from said sand receiving space in an inclined manner in relation to said sand deflecting space;
a pushing air tube, protruding coaxially into said sand mixing channel from below, for producing an air stream for conveying spreading sand;
a nozzle insert; and
said housing block having an inflow channel opening out into said sand deflecting space from above, said nozzle insert being arranged for producing an air jet directed downward into said sand deflecting space and into said sand blowing-out channel, and wherein said nozzle insert is detachably fitted by insertion into said inflow channel, so that easy insertion of said nozzle insert into said inflow channel and similarly easy removal is allowed, and wherein said nozzle insert can be selected from a set of interchangeable nozzle inserts with differently dimensioned nozzle diameters in accordance with a grain size of the spreading sand used.

2. The metering device according to claim 1 , wherein said nozzle insert is a brass turned part.

3. The metering device according to claim 1 , wherein said sand mixing channel rises at an angle of inclination in a range of 10° to 40° with respect to a horizontal.

4. The metering device according to claim 1 , wherein:
said pushing air tube has a mouth; and
said sand feeding funnel has an outlet portion which opens out into said sand mixing channel from above in a region of said mouth of said pushing air tube.

5. The metering device according to claim 1 , wherein said sand mixing channel is formed as a first cylindrical borehole and said sand blowing-out channel is formed as a second cylindrical borehole in said housing block, and said first and second cylindrical boreholes having equivalent diameters.

6. The metering device according to claim 5 , wherein said sand deflecting space is formed as a cylindrical transverse borehole that runs perpendicularly in relation to said sand mixing channel and said sand blowing-out channel and a diameter of said cylindrical transverse borehole is greater than said diameters of said sand mixing channel and said sand blowing-out channel.

7. The metering device according to claim 5 , wherein said pushing air tube is formed as a screw-in part, which is screwed into said first cylindrical borehole from an outside to a predetermined setting depth.

8. The metering device according to claim 1 , wherein said housing block is produced as a one-piece precision casting or 3D printed part.

9. The metering device according to claim 1 , further comprising a thermal element for heating the spreading sand and being integrated into said housing block.

10. The metering device according to claim 1 , wherein said sand mixing channel rises at an angle of inclination in a range of 20° to 30° with respect to a horizontal.

11. The metering device according to claim 1 , wherein said nozzle insert is disposed in said inflow channel upstream of said deflecting space.

12. The metering device according to claim 1 , wherein an end of said inflow channel is located on an outer side of said housing block, said nozzle insert being fitted into said inflow channel at said end.

Assignees

• Siemens Mobility GmbH

Inventors

• Gronau Hans-Joachim

Classifications

• B61C15/10

  by depositing sand or like friction increasing materials (for vehicles in general B60B; combined control of sanding apparatus and brakes B61H) · CPC title

• B60B39/08

  the dispensing being effected by fluid means · CPC title

• B61C15/102 Primary

  with sanding equipment of mechanical or fluid type, e.g. by means of steam · CPC title

• B60B39/023 Primary

  related to metering valves · CPC title

• B60Y2200/30

  Railway vehicles · CPC title