IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0582630
(2004-12-02)
|
등록번호 |
US-7823461
(2010-11-22)
|
우선권정보 |
DE-103 58 268(2003-12-11); DE-10 2004 006 382(2004-02-09) |
국제출원번호 |
PCT/EP2004/053236
(2004-12-02)
|
§371/§102 date |
20070226
(20070226)
|
국제공개번호 |
WO05/057140
(2005-06-23)
|
발명자
/ 주소 |
- Kappertz, Fred
- Voigt, Frank
- Wild, Daniel
|
출원인 / 주소 |
- Endress + Hauser Flowtec AG
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
3 |
초록
▼
A flow sensor includes: A measuring tube for the conveying of an electrically conductive fluid; a magnetic circuit arrangement arranged on the measuring tube for producing and guiding a magnetic field, which induces an electric field in the flowing fluid; and measuring electrodes for the tapping of
A flow sensor includes: A measuring tube for the conveying of an electrically conductive fluid; a magnetic circuit arrangement arranged on the measuring tube for producing and guiding a magnetic field, which induces an electric field in the flowing fluid; and measuring electrodes for the tapping of a voltage of the electric field. The measuring tube includes a carrier tube and liner, especially a tubular liner, of insulating material, accommodated in a lumen of the carrier tube. A support skeleton may serve for stabilization is embedded in the liner. The carrier tube additionally has at least a first groove formed in a wall of the carrier tube and open towards the lumen of the carrier tube, whereby, on the one hand, the tendency of the liner and/or of the possibly present support skeleton towards crack formation upon temperature changes, especially in the case of cooling, can be considerably reduced, and, on the other hand, a rotation or displacement of the support skeleton in the carrier tube, especially in the case of possible material shrinkage, can be effectively prevented.
대표청구항
▼
The invention claimed is: 1. A magneto-inductive flow sensor for a fluid flowing in a pipeline, comprising: a measuring tube for conveying the fluid; a magnetic circuit arrangement arranged at said measuring tube for producing and guiding a magnetic field, which induces an electric field in the flo
The invention claimed is: 1. A magneto-inductive flow sensor for a fluid flowing in a pipeline, comprising: a measuring tube for conveying the fluid; a magnetic circuit arrangement arranged at said measuring tube for producing and guiding a magnetic field, which induces an electric field in the flowing fluid; and measuring electrodes for tapping a voltage from the electric field, wherein: said measuring tube includes a carrier tube and a liner, especially a tubular liner, of insulating material accommodated in a lumen of said carrier tube; at least one groove formed in a wall of said carrier tube, which is open toward the lumen of said carrier tube, said measuring tube includes, an open-pored support skeleton embedded in said liner for stabilizing said liner; said at least one groove, is at least partially so filled by a material, especially a sintered material, of said support skeleton, directly sintered in said carrier tube, that said support skeleton is connected by shape interlocking with said carrier tube; the strength loss temperature of said carrier tube is greater than the strength loss temperature of said support skeleton a ridge is formed on said support skeleton corresponding to said at least one groove, and said ridge is comprised, at least in part, of the material of said support skeleton and extends into said at least one groove; and said at least one groove is embodied as an annular groove extending essentially coaxially with the wall of said carrier tube, said at least one groove located between the first end of the measuring tube and the second end of the measuring tube and spaced apart from a first widening and spaced apart from a second widening. 2. The magneto-inductive flow sensor as claimed in claim 1, wherein: said at least one groove has a backcut, which is so filled by material of said support skeleton that a radially effective shape interlocking is formed between said support skeleton and said carrier tube. 3. The magneto-inductive flow sensor as claimed in claim 1, wherein: said carrier tube further has an additional groove, spaced from said at least one groove, formed in a wall of said carrier tube and open towards the lumen of said carrier tube. 4. The magneto-inductive flow sensor as claimed in claim 1, wherein: said at least one groove, is at least partially so filled by insulating material of said liner, that said liner is connected with said carrier tube by shape-interlocking. 5. The magneto-inductive flow sensor as claimed in claim 1, wherein: said at least one groove includes a backcut, which is so filled by insulating material of said liner, that a shape-interlocking effective at least radially inwardly is formed between said liner and said carrier tube. 6. The magneto-inductive flow sensor as claimed in claim 1, wherein: said at least one groove has an essentially trapezoidally shaped cross section. 7. A method for manufacturing a measuring tube for a flow sensor comprising a measuring tube which includes a carrier tube and a liner, a magnetic circuit arrangement, and measuring electrodes, which method comprises the steps of: forming at least one groove in a wall of said carrier tube which is open toward the lumen of said carrier tube; producing a support skeleton in the lumen of the carrier tube; forming a ridge on said support skeleton corresponding to said at least one groove, the ridge being comprised, at least in part, of the material of the support skeleton and extends into said at least one groove; and embodying said at least one groove as an annular groove extending essentially coaxially with the wall of said carrier tube, said at least one groove located between the first end of the measuring tube and the second end of the measuring tube and spaced apart from a first widening and spaced apart from a second widening, introducing the liner into the lumen of the carrier tube, wherein: for producing the support skeleton, loose sinter starting material is so charged into the lumen of the carrier tube, that it at least partially fills the at least one groove, and the charged sinter starting material is sintered within the carrier tube; for introducing the liner into the lumen, insulating material is allowed to penetrate at least partially into the produced support skeleton and is allowed to solidify in the lumen of the carrier tube, after the sinter starting material has been sintered within the carrier tube; and the strength loss temperature of the carrier tube is provided to be greater than the strength loss temperature of the support skeleton.
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