CN103292853A - Ceramic measuring tube for electromagnetic flowmeter - Google Patents
Ceramic measuring tube for electromagnetic flowmeter Download PDFInfo
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- CN103292853A CN103292853A CN201310204915XA CN201310204915A CN103292853A CN 103292853 A CN103292853 A CN 103292853A CN 201310204915X A CN201310204915X A CN 201310204915XA CN 201310204915 A CN201310204915 A CN 201310204915A CN 103292853 A CN103292853 A CN 103292853A
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Abstract
The invention discloses a ceramic measuring tube for an electromagnetic flowmeter, relates to the technical field of fluid measurement, and aims at solving the technical problems that existing ceramic measuring tubes are prone to leakage and poor in heat shock resistance, and cannot adapt to different corrosive media as electrodes are made of single materials. The ceramic measuring tube comprises a tube body with two ends open, and the tube body is axially divided into three tube sections which are a left tube section, a middle tube section and a right tube section respectively and sequentially from left to right. The left tube section is divided into a left tube subsection and a right tube subsection, the outer diameter of the left tube subsection is larger than or equal to that of the right tube subsection, and the outer diameter of the right tube subsection and the tube wall thickness are increased progressively from right to left. The right tube section is divided into a left tube subsection and a right tube subsection, the outer diameter of the right tube subsection is larger than or equal to that of the left tube subsection, and the outer diameter of the left tube subsection and the tube wall thickness are increased progressively from left to right. The measuring tube is good in heat impact resistance and capable of effectively avoiding fluid leakage.
Description
Technical field
The present invention relates to the fluid measurement technology, particularly relate to a kind of technology of the ceramic measuring tube for electromagnetic flowmeter.
Background technology
Ceramic measuring tube has the acids of being able to bear strong corrosion and wear-resistant corrosion resistant advantage, is applicable to deep-etching acids such as measuring hydrochloric acid, sulfuric acid, nitric acid, hydrofluorite, and contains the paper pulp, ore pulp, coal water slurry, mud etc. of bases, solid particle, fibrous fluid media (medium).Be widely used in the flow measurement in fields such as papermaking, mining, metallurgy, Coal Chemical Industry, food, medical and health.
As shown in Figure 2, the patent No. is that 86105077 Chinese patent has disclosed a kind of electromagnetic flowmeter, the two ends of the ceramic measuring tube that this flowmeter adopts have the flange 221 of outward radial bending, flange and target pipe fitting by the ceramic measuring tube two ends during use achieve a butt joint, when this ceramic measuring tube uses, stress all concentrates on the flange at ceramic measuring tube two ends, and thermal shock resistance is relatively poor, and body is cracked easily.
As shown in Figure 3, the patent No. is that 90207310.9 Chinese patent has disclosed a kind of ceramic electromagnetic flowmeter, the ceramic measuring tube 331 that this flowmeter adopts is straight-through pipes that two ends do not have flange, ceramic measuring tube 331 places in the fiberglass sheath 332, adopt the fiberglass pouring type that ceramic measuring tube and fiberglass sheath are combined as a whole, achieve a butt joint by fiberglass sheath and target pipe fitting during use, because stress concentrates on the fiberglass sheath, therefore the thermal shock resistance of ceramic measuring tube is better, body is not easily broken, but the combination of ceramic measuring tube and fiberglass sheath is insecure, can be subjected to the impulsive force of external force and fluid inside in actual applications, reach the influence of the pottery factors such as thermal expansivity different with glass-reinforced plastic material, cause seal failure because producing the gap between ceramic measuring tube and the fiberglass sheath easily, leak thereby fluid takes place, and have influence on the precision of measurement data.
As shown in Figure 4, the patent No. is that 93101261.9 Chinese patent has disclosed a kind of electromagnetic flowmeter, the ceramic measuring tube 441 that this flowmeter adopts places in the pipe flange 442, the outer, two ends of ceramic measuring tube 441 is formed with chamfering, by outside the inside surface of pipe flange 442 and ceramic measuring tube 441 two ends, between the chamfering O-ring seal 443 being set, realize the antiseep sealing between ceramic measuring tube and the pipe flange, achieve a butt joint by pipe flange and target pipe fitting during use, because stress concentrates on the pipe flange, therefore the thermal shock resistance of ceramic measuring tube is better, body is not easily broken, this flowmeter is noticed the axial compressive force of pipe flange in seal approach, therefore need make between the inside surface of ceramic measuring tube and pipe flange and leave 0.5 mm clearance, but this flowmeter is not considered the fluid pressure inside, after the O-ring seal that arranges between the chamfering outside pipe flange inside surface and ceramic measuring tube two ends is subjected to radially hydrodynamic pressure, be easy to cause seal failure, leak thereby fluid takes place, and have influence on the precision of measurement data.
Summary of the invention
At the defective that exists in the above-mentioned prior art, it is better that technical matters to be solved by this invention provides a kind of thermal shock resistance, body is not easily broken, and can effectively avoid fluid to leak, and improves the ceramic measuring tube that is used for electromagnetic flowmeter of measurement data precision.
In order to solve the problems of the technologies described above, a kind of ceramic measuring tube for electromagnetic flowmeter provided by the present invention, this ceramic measuring tube is the body of a left and right sides both ends open, it is characterized in that: the body of this ceramic measuring tube is divided into three pipeline sections vertically, respectively is left pipeline section, middle pipeline section, right pipeline section from left to right;
Described left pipeline section is divided into right two the sub-pipeline sections of a first from left, and the external diameter of left sub-pipeline section wherein is more than or equal to the external diameter of the sub-pipeline section in the right side, and external diameter and the pipe thickness of right sub-pipeline section wherein all increase progressively from right to left;
Described right pipeline section is divided into right two the sub-pipeline sections of a first from left, and the external diameter of right sub-pipeline section wherein is more than or equal to the external diameter of the sub-pipeline section in a left side, and external diameter and the pipe thickness of left sub-pipeline section wherein all increase progressively from left to right.
Further, the internal diameter of described left pipeline section increases progressively from right to left, and the internal diameter of described right pipeline section increases progressively from left to right.
Further, the inwall of described left pipeline section and the inwall of right pipeline section, and the angle between the ceramic measuring tube central axis is 15 ± 5 degree.
Further, the outer wall of the outer wall of the right sub-pipeline section of described left pipeline section and the left sub-pipeline section of right pipeline section, and the angle between the ceramic measuring tube central axis is 30 ± 10 degree.
Further, offer at least one electrode hole on the tube wall of described middle pipeline section, the hole heart axes of described electrode hole intersects with the ceramic measuring tube central axis and is vertical mutually.
Further, the outer wall of described middle pipeline section is provided with the pit of at least one radial depressions, is smooth flat at the bottom of the hole of each pit, and the aperture, the outside of each electrode hole lays respectively in each pit.
Ceramic measuring tube for electromagnetic flowmeter provided by the invention, by axially anti-and radial compression force, the optimum mechanical structure design of impulsive force, end face and target pipe fitting by the ceramic measuring tube two ends during use achieve a butt joint, can effectively avoid fluid to leak, improve the measurement data precision, and adopt left pipeline section, the right pipeline section of pipe thickness gradual change design can tackle bigger axial impact force, so thermal shock resistance is higher, body is not easily broken.
Description of drawings
Fig. 1 is the main pseudosection of the ceramic measuring tube that is used for electromagnetic flowmeter of the embodiment of the invention;
Fig. 2, Fig. 3, Fig. 4 are the main pseudosections of three kinds of ceramic measuring tubes adopting of existing electromagnetic flowmeter.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
As shown in Figure 1, a kind of ceramic measuring tube for electromagnetic flowmeter that the embodiment of the invention provides, this ceramic measuring tube is the body of a left and right sides both ends open, it is characterized in that: the body of this ceramic measuring tube is divided into three pipeline sections vertically, respectively is left pipeline section 1, middle pipeline section 2, right pipeline section 3 from left to right;
Described left pipeline section 1 is divided into right two the sub-pipeline sections of a first from left, and the external diameter of left sub-pipeline section 11 wherein is more than or equal to the external diameter of the sub-pipeline section 12 in the right side, and external diameter and the pipe thickness of right sub-pipeline section 12 wherein all increase progressively from right to left;
Described right pipeline section 3 is divided into right two the sub-pipeline sections of a first from left, and the external diameter of right sub-pipeline section 31 wherein is more than or equal to the external diameter of the sub-pipeline section 32 in a left side, and external diameter and the pipe thickness of left sub-pipeline section 32 wherein all increase progressively from left to right.
In the embodiment of the invention, the internal diameter of described left pipeline section 1 increases progressively from right to left, and the internal diameter of described right pipeline section 3 increases progressively from left to right.
In the embodiment of the invention, the right side of the left side of described left pipeline section 1 and right pipeline section 3 respectively is provided with the steps type seal circle mounting groove 4 around ceramic measuring tube central axis one circle.
In the embodiment of the invention, offer at least one electrode hole 5 on the tube wall of described middle pipeline section 2, the hole heart axes of described electrode hole 5 intersects with the ceramic measuring tube central axis and is vertical mutually.
The outer wall of pipeline section 2 is provided with the pit of at least one radial depressions in described, is used for placing mechanical seal ring, is smooth flat at the bottom of the hole of each pit, and the aperture, the outside of each electrode hole 5 lays respectively in each pit.
When the embodiment of the invention is used, in the steps type seal circle mounting groove 4 of ceramic measuring tube two ends end face, insert O-ring seal, in electrode hole, insert potential electrode, the end face at ceramic measuring tube two ends docks with the target pipe fitting, O-ring seal by ceramic measuring tube two ends end face is realized sealing, after fluid flows into from left pipeline section, because the inner chamber of left pipeline section shrinks from left to right, flow rate of fluid can be accelerated gradually, during fluid flows into behind the pipeline section flow velocity reach the highest, the quickening of flow velocity also helps the measuring accuracy of potential electrode, and the flow speed data of middle pipeline section inner fluid can converse the actual flow velocity of detected fluid easily in conjunction with the degree of shrinkage of left pipeline section inner chamber, during fluid flows out behind the pipeline section, along with right pipeline section from left to right gradually the inner chamber of expansion flow out, its flow velocity also slows down gradually, returns to original flow velocity after flowing out right pipeline section.
In the embodiment of the invention, the inwall of the inwall of described left pipeline section 1 and right pipeline section 3, and the angle between the ceramic measuring tube central axis is 15 ± 5 degree, this angle too small (such as less than 10 degree) the then raising to measuring accuracy does not almost have help, this angle excessive (such as greater than 20 degree) then can influence the wall thickness of left pipeline section, right pipeline section, thereby has influence on the thermal shock resistance of ceramic measuring tube.
In the embodiment of the invention, the outer wall of the outer wall of the right sub-pipeline section 12 of described left pipeline section and the left sub-pipeline section 32 of right pipeline section, and the angle between the ceramic measuring tube central axis is 30 ± 10 degree, this angle too small can cause ceramic measuring tube integral body long, this angle is crossed conference influences thermal shock resistance, and pipeline section and left pipeline section in can causing, right pipeline section joint portion are cracked easily.
Claims (6)
1. ceramic measuring tube that is used for electromagnetic flowmeter, this ceramic measuring tube is the body of a left and right sides both ends open, it is characterized in that: the body of this ceramic measuring tube is divided into three pipeline sections vertically, respectively is left pipeline section, middle pipeline section, right pipeline section from left to right;
Described left pipeline section is divided into right two the sub-pipeline sections of a first from left, and the external diameter of left sub-pipeline section wherein is more than or equal to the external diameter of the sub-pipeline section in the right side, and external diameter and the pipe thickness of right sub-pipeline section wherein all increase progressively from right to left;
Described right pipeline section is divided into right two the sub-pipeline sections of a first from left, and the external diameter of right sub-pipeline section wherein is more than or equal to the external diameter of the sub-pipeline section in a left side, and external diameter and the pipe thickness of left sub-pipeline section wherein all increase progressively from left to right.
2. the ceramic measuring tube for electromagnetic flowmeter according to claim 1, it is characterized in that: the internal diameter of described left pipeline section increases progressively from right to left, and the internal diameter of described right pipeline section increases progressively from left to right.
3. the ceramic measuring tube for electromagnetic flowmeter according to claim 2 is characterized in that: the inwall of described left pipeline section and the inwall of right pipeline section, and the angle between the ceramic measuring tube central axis is 15 ± 5 degree.
4. according to claim 1 or 2 or 3 described ceramic measuring tubes for electromagnetic flowmeter, it is characterized in that: the outer wall of the outer wall of the right sub-pipeline section of described left pipeline section and the left sub-pipeline section of right pipeline section, and the angle between the ceramic measuring tube central axis is 30 ± 10 degree.
5. according to claim 1 or 2 or 3 described ceramic measuring tubes for electromagnetic flowmeter, it is characterized in that: offer at least one electrode hole on the tube wall of pipeline section in described, the hole heart axes of described electrode hole intersects with the ceramic measuring tube central axis and is vertical mutually.
6. the ceramic measuring tube for electromagnetic flowmeter according to claim 5, it is characterized in that: the outer wall of pipeline section is provided with the pit of at least one radial depressions in described, be smooth flat at the bottom of the hole of each pit, the aperture, the outside of each electrode hole lays respectively in each pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310204915XA CN103292853A (en) | 2013-05-28 | 2013-05-28 | Ceramic measuring tube for electromagnetic flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310204915XA CN103292853A (en) | 2013-05-28 | 2013-05-28 | Ceramic measuring tube for electromagnetic flowmeter |
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| CN103292853A true CN103292853A (en) | 2013-09-11 |
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| CN201310204915XA Pending CN103292853A (en) | 2013-05-28 | 2013-05-28 | Ceramic measuring tube for electromagnetic flowmeter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165662A (en) * | 2014-05-26 | 2014-11-26 | 上海肯特仪表股份有限公司 | Unlined pipeline type necking electromagnetic water meter |
| CN108020281A (en) * | 2018-01-16 | 2018-05-11 | 南京惠然测控技术有限公司 | A kind of electromagnetism water meter measurement pipe |
| CN109416267A (en) * | 2016-07-12 | 2019-03-01 | 恩德斯+豪斯流量技术股份有限公司 | For by the flow velocity of magnetic inductive flow measurement equipment measuring medium or the method for volume flow and magnetic inductive flow measurement equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5113690A (en) * | 1989-01-05 | 1992-05-19 | Krohne Ag | Electromagnetic flowmeter |
| CN2695921Y (en) * | 2004-01-09 | 2005-04-27 | 陈宝荣 | Magnetoelectric vortex shedding flowmeter |
| US20060144161A1 (en) * | 2004-12-02 | 2006-07-06 | Heijnsdijk Alexander M | Magnetoinductive flowmeter and method for producing a magnetoinductive flowmeter |
| CN203287058U (en) * | 2013-05-28 | 2013-11-13 | 浦瑞斯仪表（上海）有限公司 | Ceramic measuring pipe for electromagnetic flowmeter |
-
2013
- 2013-05-28 CN CN201310204915XA patent/CN103292853A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5113690A (en) * | 1989-01-05 | 1992-05-19 | Krohne Ag | Electromagnetic flowmeter |
| CN2695921Y (en) * | 2004-01-09 | 2005-04-27 | 陈宝荣 | Magnetoelectric vortex shedding flowmeter |
| US20060144161A1 (en) * | 2004-12-02 | 2006-07-06 | Heijnsdijk Alexander M | Magnetoinductive flowmeter and method for producing a magnetoinductive flowmeter |
| CN203287058U (en) * | 2013-05-28 | 2013-11-13 | 浦瑞斯仪表（上海）有限公司 | Ceramic measuring pipe for electromagnetic flowmeter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165662A (en) * | 2014-05-26 | 2014-11-26 | 上海肯特仪表股份有限公司 | Unlined pipeline type necking electromagnetic water meter |
| CN109416267A (en) * | 2016-07-12 | 2019-03-01 | 恩德斯+豪斯流量技术股份有限公司 | For by the flow velocity of magnetic inductive flow measurement equipment measuring medium or the method for volume flow and magnetic inductive flow measurement equipment |
| CN109416267B (en) * | 2016-07-12 | 2020-09-11 | 恩德斯+豪斯流量技术股份有限公司 | Method for measuring the flow velocity or volume flow of a medium by means of a magnetic-inductive flow measuring device and magnetic-inductive flow measuring device |
| US11029182B2 (en) | 2016-07-12 | 2021-06-08 | Endress+Hauser Flowtec Ag | Magnetic-inductive flowmeter and method for measuring the flow velocity of low conductivity media with a narrowing measuring tube and a field guide-back device |
| CN108020281A (en) * | 2018-01-16 | 2018-05-11 | 南京惠然测控技术有限公司 | A kind of electromagnetism water meter measurement pipe |
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Application publication date: 20130911 |