Displacement Transducer

Patent metadata

Field	Value
Publication number	US-2020003331-A1
Application number	US-201916455021-A
Country	US
Kind code	A1
Filing date	Jun 27, 2019
Priority date	Jun 29, 2018
Publication date	Jan 2, 2020
Grant date	—

Abstract

A displacement transducer for a valve in a housing includes a cylindrical displacement transducer core, a coil, a coil housing, and a compensation element. The coil is positioned in the coil housing, and radially encloses the core. The coil housing has a first side supported by the housing, and a supporting face positioned between the first side and an axial end side of the coil housing facing away from the valve such that a length change of the coil is not limited in an axial direction facing away from the valve. The housing is axially supported on the compensation element via the supporting face. A side of the compensation element facing away from the valve is supported on one or more of (i) an adjustable cover, (ii) a standard component of a supporting chain of the core, and (iii) a component formed from a material with a suitable coefficient of thermal expansion.

First claim

What is claimed is:

1 . A displacement transducer for a valve, comprising:
a transducer housing; a transducer core positioned in the transducer housing and configured to connect to a valve slide of the valve; a coil housing including:
a first housing side that, in an assembled state, faces toward the valve slide, wherein the coil housing is supported on the transducer housing via the first housing side; and
a supporting face that, in the assembled state, faces away from the valve slide;
at least one coil positioned in the coil housing, assigned to the transducer core, and including an end section that, in the assembled state, extends away from the valve slide; wherein the supporting face of the coil housing is spaced apart in an axial direction from the end section of the at least one coil; wherein at least one of the at least one coil and the coil housing has a length configured to change without limit, at least starting from the supporting face of the coil housing, in a direction that, in the assembled state, faces away from the valve slide; and wherein the coil housing is supported, via the supporting face, by one or more of (i) a compensation element on an adjustable cover of the transducer housing, (ii) at least one standard component of a supporting chain of the at least one coil, the at least one standard component having a relatively small coefficient of thermal expansion, and (iii) a supporting chain of the transducer core.

2 . The displacement transducer of claim 1 , wherein:
the coil housing is supported by the compensation element; and the compensation element has a relatively small coefficient of thermal expansion.

3 . The displacement transducer of claim 2 , wherein the coefficient of thermal expansion of the compensation element is less than 100% of a coefficient of thermal expansion of a component having a next smallest coefficient of thermal expansion in the supporting chain of the coil.

4 . The displacement transducer of claim 1 , wherein:
the coil housing is supported by the standard element in the supporting chain of the coil; and wherein the coefficient of thermal expansion of the standard element is less than 100% of a coefficient of thermal expansion of a component having a next smallest coefficient of thermal expansion of in either the supporting chain of the displacement transducer or the supporting chain of the at least one coil.

5 . The displacement transducer of claim 1 , wherein the compensation element has a sleeve-like shape and encloses the at least one coil.

6 . The displacement transducer of claim 1 , wherein the compensation element is positioned radially via one or more of the adjustable cover and the coil housing.

7 . The displacement transducer of claim 1 , wherein the compensation element extends from the supporting face of the coil housing to beyond the at least one coil and as far as a cover bottom of the adjustable cover.

8 . The displacement transducer of claim 1 , wherein the adjustable cover includes a frustoconical supporting face that supports the compensation element.

9 . The displacement transducer of claim 1 , wherein the adjustable cover has a pot-like shape having an opening that, in the assembled state, faces toward the valve slide.

10 . The displacement transducer of claim 1 , wherein:
the transducer housing has an internal thread; and the adjustable cover has an external thread corresponding to and screwed into the internal thread of the transducer housing.

11 . The displacement transducer of claim 1 , wherein the adjustable cover protrudes from the transducer housing.

12 . The displacement transducer of claim 1 , wherein the compensation element is formed at least partially or completely from Invar.

13 . The displacement transducer of claim 1 , wherein the standard component is formed at least partially or completely from Invar.

14 . The displacement transducer of claim 1 , wherein one or more of the compensation element and the standard component has a coefficient of thermal expansion that is less than or equal to 10×10 −6 1/K.

15 . A valve, comprising:
a valve slide; and a displacement transducer, including:
a transducer housing;
a transducer core positioned in the transducer housing and connected to the valve slide;
a coil housing including:
a first housing side facing toward the valve slide, wherein the coil housing is supported on the transducer housing via the first housing side; and
a supporting face facing away from the valve slide;

at least one coil positioned in the coil housing, assigned to the transducer core, and including an end section that extends away from the valve slide;
wherein the supporting face of the coil housing is spaced apart in an axial direction from the end section of the at least one coil;
wherein at least one of the at least one coil and the coil housing has a length configured to change without limit, at least starting from the supporting face of the coil housing, in a direction facing away from the valve slide; and
wherein the coil housing is supported, via the supporting face, by one or more of (i) a compensation element on an adjustable cover of the transducer housing, (ii) at least one standard component of a supporting chain of the at least one coil, the at least one standard component having a relatively small coefficient of thermal expansion, and (iii) a supporting chain of the transducer core.

Assignees

• Bosch Gmbh Robert

Inventors

• Beck Thorsten

Classifications

• G01B7/02

  for measuring length, width or thickness (G01B7/004, G01B7/12 take precedence) · CPC title

• F16K37/0041 Primary

  for measuring valve parameters (F16K37/0033 takes precedence) · CPC title

• F16K31/0675

  Electromagnet aspects, e.g. electric supply therefor · CPC title

• H01F7/1607

  Armatures entering the winding · CPC title

• F16K31/0679

  with more than one energising coil · CPC title