Method for manufacturing a sensor of a thermal, flow measuring device for measuring mass flow of a medium in a measuring tube

Patent metadata

Field	Value
Publication number	US-11248941-B2
Application number	US-201716315735-A
Country	US
Kind code	B2
Filing date	Jun 26, 2017
Priority date	Jul 7, 2016
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

The present disclosure relates to a method for manufacturing a sensor for a thermal, flow measuring device. The method includes, in such case, manufacturing a metal jacketing for a sensor core, introducing the sensor core into the metal jacketing and sintering the metal jacketing with introduced sensor core.

First claim

The invention claimed is:

1. A method for manufacturing a sensor of a thermal, flow measuring device for measuring mass flow of a medium in a measuring tube, the method comprising:
manufacturing a metal jacketing using a metal powder injection molding method, wherein the jacketing has a first blind hole, an open first end, and a closed second end;
introducing a sensor core into the first blind hole of the jacketing through the open first end, wherein the jacketing completely encloses the sensor core; and
sintering the jacketing such that, after sintering, a releasing of the sensor core from the jacketing requires a tensile force of at least 1 Newton,
wherein the sensor core includes:
a ceramic core having a lateral surface;
a metal wire wound around the lateral surface of the ceramic core; and
an electrically insulating layer adapted to insulate the metal wire electrically from the jacketing.

2. The method as claimed in claim 1 , wherein the jacketing shrinks during the sintering, wherein a cross section of the first blind hole before sintering of the jacketing is greater than a cross section of the sensor core, wherein after sintering of the jacketing the cross section of the first blind hole equals the cross section of the sensor core, and wherein the jacketing after sintering of completely encloses the sensor core and establishes a thermal contact with the sensor core.

3. The method as claimed in claim 1 , wherein the metal powder injection molding method uses a metal powder having a grain size less than 6 micrometers.

4. The method as claimed in claim 2 , wherein the volume of the jacketing decreases by less than 40% from the sintering after insertion of the sensor core.

5. The method as claimed in claim 1 , wherein the ceramic core has a hollow-cylindrical structure having an open third end and an open fourth end, wherein the metal wire is led through the fourth end to the third end, and
wherein the third end of the ceramic core faces toward the open first end of the jacketing and the fourth end of the ceramic core faces toward the closed second end of the jacketing.

6. The method as claimed in claim 1 , wherein the ceramic core has a hollow-cylindrical structure having an open third end and a fifth end, wherein the ceramic core has in the region of the fifth end a radial bore, wherein the metal wire is led through the radial bore to the third end, and
wherein the third end of the ceramic core faces toward the open first end of the jacketing and the fifth end of the ceramic core faces toward the closed second end of the jacketing.

Assignees

• Flowtec Ag

Inventors

• Schultheis Hanno
• Grün Alexander
• Gaberthüel Stephan

Classifications

• B22F7/08

  with one or more parts not made from powder {(B22F7/062 takes precedence)} · CPC title

• G01F1/684 Primary

  Structural arrangements; Mounting of elements, e.g. in relation to fluid flow · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• G01F15/14

  Casings, e.g. of special material · CPC title

• H01C3/00

  Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids · CPC title