CN211205405U

CN211205405U - Electromagnetic flowmeter

Info

Publication number: CN211205405U
Application number: CN201921884251.5U
Authority: CN
Inventors: 邓立群; 李哲浩
Original assignee: Shenzhen Anso Measurement & Control Instruments Co ltd
Current assignee: Shenzhen Tuoan Trust Internet Of Things Co ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-08-07
Anticipated expiration: 2029-11-04

Abstract

The utility model provides an electromagnetic flowmeter, which comprises a measuring conduit, a magnetic circuit system and an induction electrode, wherein the measuring conduit comprises a measuring section, two mounting sections and two transition sections along the length direction, and the inner side wall or the outer side wall of the mounting sections is circular; the measuring section is provided with two oppositely arranged first side walls and two oppositely arranged second side walls along the circumferential direction of the measuring section, the cross sections of the two first side walls and the two second side walls are curved surfaces, the second side walls are connected between the two first side walls and are respectively connected with first connecting points and second connecting points, and the first distance between the two first connecting points along the second direction is greater than the second distance between the first connecting points and the second connecting points along the first direction; the magnetic circuit system is arranged on the outer sides of the two first side walls and used for generating an alternating magnetic field parallel to the first direction, and the two induction electrodes are respectively arranged on the two second side walls in a penetrating mode. The utility model provides an electromagnetic flowmeter, alternating magnetic field distribution is even on its measuring section, and the measuring result is accurate.

Description

Electromagnetic flowmeter

Technical Field

The utility model belongs to the technical field of flow measurement, more specifically say, relate to an electromagnetic flowmeter.

Background

The electromagnetic flowmeter measures the flow of conducting fluid based on the electromotive force induced when the conducting fluid passes through external magnetic field by means of electromagnetic induction principle.

The structure of the electromagnetic flowmeter mainly comprises a magnetic circuit system, a measuring conduit, an electrode, a shell, a lining, a converter and the like. The magnetic circuit system is used for generating a uniform direct current or alternating current magnetic field, the measuring conduit is used for allowing a measured conductive liquid to pass through, the electrode is used for leading out an induced potential signal integrated with the measured conductive liquid, the shell is used for isolating external magnetic field interference, the lining is used for increasing the corrosion resistance of the measuring conduit, and the converter is used for amplifying the induced potential signal and converting the induced potential signal into a uniform standard signal.

The magnetic field distribution in the measuring conduit of the existing electromagnetic flowmeter is not uniform, which influences the induction electrode of the electromagnetic flowmeter to stably induce a water flow cutting magnetic field, so that the electromagnetic flowmeter cannot accurately measure the flow.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electromagnetic flowmeter to solve the inhomogeneous technical problem who causes the electromagnetic flowmeter to measure inaccurate among the prior art of the magnetic field distribution in the measurement pipe of the electromagnetic flowmeter.

In order to achieve the above object, the utility model adopts the following technical scheme: the electromagnetic flowmeter comprises a measuring guide pipe, a magnetic circuit system and an induction electrode, wherein the measuring guide pipe comprises a measuring section, two mounting sections and two transition sections along the length direction, the two mounting sections are respectively and symmetrically arranged at two ends of the measuring section, the two transition sections are respectively connected between two ends of the measuring section and the two mounting sections, and the inner side wall or the outer side wall of each mounting section is circular; the measuring section is flat and is provided with two first side walls oppositely arranged along a first direction and two second side walls oppositely arranged along a second direction along the circumferential direction of the measuring section, the first direction is vertical to the second direction, the cross sections of the two first side walls and the two second side walls are both curved surfaces, the second side walls are connected between the two first side walls and are respectively connected with first connecting points and second connecting points with the two first side walls, the two first connecting points and the two second connecting points are positioned on the same rectangle, and the first distance of the two first connecting points along the second direction is greater than the second distance of the first connecting points and the second connecting points along the first direction; the magnetic circuit system is arranged on the outer sides of the two first side walls and used for generating an alternating magnetic field parallel to the first direction, the two induction electrodes are respectively arranged on the two second side walls in a penetrating mode, and a connecting line between the two induction electrodes is perpendicular to the alternating magnetic field.

Preferably, the ratio of the first distance to the second distance ranges from 3:1 to 3: 2.

Preferably, the ratio of the first distance to the second distance is 2: 1.

Preferably, the cross section of the first side wall is a concave curved surface or a convex curved surface;

the cross section of the first side wall is a hyperbolic surface;

or the cross section of the first side wall is an ellipsoid;

or the cross section of the first side wall is a circular arc surface.

Preferably, the cross section of the second side wall is an arc surface, the two second side walls have a common center, and the common center is set as the center point of the cross section of the measuring section.

Preferably, the two second side walls are symmetrically provided with signal electrode holes respectively, the signal electrode holes are located in the middle of the second side walls, the two sensing electrodes are installed in the signal electrode holes respectively, and the two first side walls are symmetrically provided with grounding electrode holes respectively.

Preferably, the electromagnetic flowmeter further comprises two supporting plates, the two supporting plates are respectively symmetrically arranged on the two first side walls or the two transition sections, the magnetic circuit system comprises a coil, and the coil is wound on the first side walls and is located between the two supporting plates.

Preferably, the cross section caliber of the installation section is larger than that of the measurement section, the cross section of the outer side wall of the installation section is circular, and the cross section of the inner side wall of the installation section is circular, or the cross section of the inner side wall of the installation section is formed by sequentially transitionally connecting a plurality of arc surfaces;

or the cross section of the inner side wall of the mounting section is circular, the cross section of the outer side wall of the mounting section is circular, or the cross section of the outer side wall of the mounting section is formed by sequentially connecting a plurality of arc surfaces in a transition manner.

Preferably, the cross-sectional caliber of the transition section is gradually reduced from the measuring section to the mounting section;

preferably, the outer diameters of the measuring section, the two transition sections and the two mounting sections on two sides in the second direction are equal.

The utility model provides an electromagnetic flowmeter's beneficial effect lies in: compared with the prior art, the utility model discloses an electromagnetic flowmeter includes the measuring pipe, magnetic circuit and response electrode, and the measuring pipe is including measuring the section along length direction, two erection sections and two changeover portions, so, can set up the cross section of measuring the section according to the measurement demand, and be circular in order to be connected with outside circular pipeline with lateral wall or lateral wall setting of erection section, and the changeover portion can carry out the transition with the cross section of measuring the section to the erection section, be convenient for liquid steadily gets into or flows the measuring pipe way, play the effect of stabilizing the water attitude. In addition, be the platykurtic with the measurement section setting, two first sidewalls set up relatively, two second sidewalls set up relatively, and two first connecting points are greater than first connecting point and second connecting point along the second distance of first direction along the first distance of second direction, also be the width of first sidewall and be greater than the width of second sidewall, so, can be so that the alternating magnetic field that magnetic circuit produced evenly distributed between two induction electrodes, two induction electrodes can respond to rivers cutting alternating magnetic field steadily, thereby make this electromagnetic flowmeter can accurate measurement liquid flow, reduce the error, improve measurement accuracy. And finally, the first side wall and the second side wall are both set to be curved surfaces, so that the water flow can uniformly cut the alternating magnetic field, and the measurement accuracy of the flowmeter is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an electromagnetic flowmeter according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view A-A of the measurement section of the measurement conduit of FIG. 1;

FIG. 3 is a schematic cross-sectional view B-B of the measurement section of the measurement conduit of FIG. 1;

FIG. 4 is a schematic cross-sectional view C-C of a transition section of the measurement conduit of FIG. 1;

FIG. 5 is a schematic D-D cross-sectional view of the installation section of the measurement conduit of FIG. 1.

Wherein, in the figures, the respective reference numerals:

1-a measuring catheter; 2-a magnetic circuit system; 3-a sensing electrode; 4-a support plate; 11-a measurement section; 12-a mounting section; 13-a transition section; 111-a first side wall; 112-a second side wall; 113-a first connection point; 114-a second connection point; 1121-signal electrode hole; 1111-ground electrode hole; 1122-pressure pilot hole; x-a first direction; y-a second direction; z-third direction.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, an electromagnetic flowmeter according to the present invention will now be described.

This electromagnetic flowmeter includes measuring pipe 1, magnetic circuit 2 and induction electrode 3, and measuring pipe 1 is along length direction including measuring section 11, two installation sections 12 and two changeover portions 13, and 11 both ends of measuring section are located to two installation sections 12 symmetry respectively, and two changeover portions 13 are connected respectively between 11 both ends of measuring section and two installation sections 12, and the inside wall or the lateral wall of installation section 12 are circular. The magnetic circuit system 2 and the induction electrode 3 are both installed on the measuring section 11, the two installation sections 12 are used for being connected with an external circular pipeline, and the transition section 13 is used for forming transition connection between the installation sections 12 and the measuring section 11.

Specifically, referring to fig. 2, the measuring section 11 is flat and has two first sidewalls 111 disposed opposite to each other along a first direction and two second sidewalls 112 disposed opposite to each other along a circumferential direction thereof, specifically, the first direction is a vertical direction in fig. 2, the second direction is a horizontal direction in fig. 2, the first direction and the second direction are perpendicular to each other, cross sections of the two first sidewalls 111 and the two second sidewalls 112 are curved surfaces, the second sidewall 112 is connected between the two first sidewalls 111 and is connected to a first connection point 113 and a second connection point 114 with the two first sidewalls 111, the two first connection points 113 and the two second connection points 114 are located on the same rectangle, and a first distance of the two first connection points 113 along the second direction is greater than a second distance of the first connection point 113 and the second connection point 114 along the first direction, wherein the second distance is a perpendicular distance of the first connection point 113 and the second connection point 114, that is, the width of the first side wall 111 in the left-right direction in fig. 2 is larger than the width of the second side wall 112 in the up-down direction in fig. 2; the magnetic circuit system 2 is disposed outside the two first side walls 111 and configured to generate an alternating magnetic field parallel to a symmetry axis of the two second side walls 112, the two inductive electrodes 3 are respectively disposed on the two second side walls 112, and a connection line between the two inductive electrodes 3 is perpendicular to the alternating magnetic field.

In the present embodiment, referring to fig. 1 and fig. 2, when the electromagnetic flowmeter is in operation, liquid flows through the measuring conduit 1 along a third direction Z (left and right directions in fig. 1), the magnetic circuit system 2 generates an alternating magnetic field along a first direction X (up and down directions in fig. 1), the two sensing electrodes 3 respectively penetrate through the two second sidewalls 112 to be connected with the liquid, and the two sensing electrodes 3 are distributed along a second direction Y (left and right directions in fig. 2), wherein the first direction X, the second direction Y, and the third direction Z are mutually perpendicular in pairs.

The utility model provides an electromagnetic flowmeter includes measuring pipe 1, magnetic circuit 2 and induction electrode 3, and measuring pipe 1 is including measuring section 11 along length direction, two installation sections 12 and two changeover portion 13, thus, can set up measuring section 11's cross section according to the measurement demand, and be circular with installation section 12's inside wall or lateral wall setting and be connected with outside circular pipeline in order to make things convenient for, and changeover portion 13 can pass through measuring section 11's cross section to installation section 12, be convenient for liquid and get into or flow measuring pipe steadily, play the effect of stabilizing the water attitude. In addition, the measuring section 11 is arranged to be flat, the two first side walls 111 are arranged oppositely, the two second side walls 112 are arranged oppositely, and the first distance between the two first connecting points 113 is greater than the second perpendicular distance between the first connecting points 113 and the second connecting points 114, that is, the width of the first side wall 111 is greater than the width of the second side wall 112, so that the alternating magnetic field generated by the magnetic circuit system 2 can be uniformly distributed between the two induction electrodes 3, and the two induction electrodes 3 can stably induce the water flow to cut the alternating magnetic field, so that the electromagnetic flowmeter can accurately measure the liquid flow, reduce errors and improve the measuring accuracy. Finally, the first side wall 111 and the second side wall 112 are both set to be curved surfaces, which further enables the water flow to uniformly cut the alternating magnetic field, further improving the measurement accuracy of the flow meter.

Preferably, the ratio of the first distance to the second distance is 3: 1-3: 2, that is, the ratio of the width of the first side wall 111 to the width of the second side wall 112 is 3: 1-3: 2, so that the cross section of the whole measuring section 11 is flat, the alternating magnetic field generated by the magnetic circuit system 2 is uniformly distributed between the two induction electrodes 3, the phenomenon that the whole measuring section 11 is too flat and not easy to form due to too large first distance is avoided, and the structure of the magnetic circuit system 2 is also prevented from being huge.

Preferably, in the present embodiment, the ratio of the first distance to the second distance is 2:1, so that it can be ensured that the whole measuring section 11 has a flat structure, which is beneficial to the uniform distribution of the alternating magnetic field, and the width of the second sidewall 112 is sufficient for the stable flow of the liquid to stably cut the alternating magnetic field, and at the same time, the whole measuring section 11 can be conveniently processed and manufactured.

Preferably, in the present embodiment, referring to fig. 2, the cross section of the first sidewall 111 is a convex curved surface, specifically, the cross section of the first sidewall 111 is a hyperbolic surface, and the focal points of the two first sidewalls 111 are located at the central point O of the cross section of the whole measurement section 11, one of which can ensure uniform distribution of the alternating magnetic field, the other of which is convenient for stable liquid flow, and the other of which is convenient for processing the measurement catheter 1. It should be understood that, in other embodiments of the present invention, according to practical situations and specific applications, the first side wall 111 may also be an inwardly concave curved surface, at which the aperture of the measuring section 11 is relatively smaller, and in addition, the cross section of the first side wall 111 may also be an arc surface, an elliptical surface, etc., which is not limited herein.

Preferably, in the present embodiment, referring to fig. 2, the cross section of the second sidewall 112 is an arc surface, the two second sidewalls 112 have a common center, and the common center is set as the central point O of the cross section of the measuring section 11.

Preferably, in this embodiment, the measuring section 11 may be formed by extruding a cylindrical tube. It should be understood that, in other embodiments of the present invention, according to actual situations and specific requirements, the measuring section 11 may also be formed by casting stainless steel, glass fiber reinforced plastic, high-strength plastic, aluminum, etc. or by hole machining, which is not limited herein.

In the embodiment, referring to fig. 2, signal electrode holes 1121 are respectively formed in symmetrical positions of the two second side walls 112, the signal electrode holes 1121 are located in the middle of the second side walls 112, the two sensing electrodes 3 are respectively installed in the signal electrode holes 1121, and the two first side walls 111 are respectively formed with a ground electrode hole 1111 in the symmetrical positions, so that the sensing electrodes 3 can be ensured to stably sense the water-flow-cutting alternating magnetic field, and the measurement accuracy of the electromagnetic flowmeter is improved. The two induction electrodes 3 of the electromagnetic flowmeter are respectively arranged on the two second side walls 112, so that the influence on flow measurement caused by accumulation of sundries or scaling at the lower part of the measurement pipe section is avoided, and the influence on the measurement of air flow on the upper part of the measurement pipe section is prevented, so that the measurement precision of the electromagnetic flowmeter is reduced, and even the condition of inaccurate measurement or incapability of measurement is caused.

In this embodiment, please refer to fig. 3, one of the second sidewalls 112 is further provided with a pressure guiding hole 1122, and by the arrangement of the pressure guiding hole 1122, when the pressure in the measurement pipeline is too large, the pressure inside the measurement pipeline can be relieved through the pressure guiding hole 1122, so as to ensure that the pressure in the measurement pipeline is stable, ensure that the water flow is stable, and further ensure that the measurement effect of the flowmeter is stable and accurate. Specifically, a pressure relief valve may be provided at the pressure pilot hole 1122 to relieve pressure.

Referring to fig. 1, the electromagnetic flowmeter further includes two supporting plates 4, the two supporting plates 4 are respectively symmetrically disposed on the two first side walls 111 or the two transition sections 13, the magnetic circuit system 2 includes a coil, and the coil is wound on the first side walls 111 and located between the two supporting plates 4, so as to ensure that the alternating magnetic field is uniformly distributed on the whole measuring section 11.

Specifically, in the present embodiment, the two supporting plates 4 are sleeved on the two transition sections 13, so as to facilitate the installation of the coils on the two first sidewalls 111.

Preferably, in this embodiment, please refer to fig. 5, a cross-sectional caliber of the installation section 12 is larger than a cross-sectional caliber of the measurement section 11, a cross-section of an outer side wall of the installation section 12 is circular, and a cross-section of an inner side wall of the installation section 12 is circular, or alternatively, a cross-section of an outer side wall of the installation section 12 is circular, and a cross-section of an inner side wall of the installation section 12 is formed by sequentially transitionally connecting a plurality of arc surfaces, so that, during installation, the outer pipeline is sleeved on the outer side wall of the installation section 12.

Furthermore, in some other embodiments of the present invention, it is also possible that the cross section of the inner side wall of the installation section 12 is circular, and the cross section of the outer side wall of the installation section 12 is circular, or the cross section of the outer side wall of the installation section 12 is formed by sequentially transitionally connecting a plurality of arc surfaces, so that, during installation, the external pipeline is inserted into the inner side wall of the installation section 12.

In this embodiment, please refer to fig. 1 and fig. 4, the cross-sectional caliber of the transition section 13 is gradually reduced from the measuring section 11 to the mounting section 12, so that the cross-sectional caliber of the transition section 13 can be uniformly transited, and the rectifying pipe section 2 is in a transitional shape design, which is beneficial for the water flow to stably enter or flow out of the measuring pipe, and plays a role of stabilizing the water state, so that the water flow in the measuring pipe section 1 is kept stable, and the water flow is beneficial for stably cutting the uniformly distributed magnetic field, thereby improving the measuring accuracy of the electromagnetic flowmeter. Specifically, the shape of the transition section 13 gradually transitions from the shape of the measurement section 11 to the shape of the mounting section 12 (transition shape) in the axial direction.

Preferably, in this embodiment, the outer diameters of the two sides of the measuring section 11, the two transition sections 13 and the two mounting sections 12 in the second direction Y are equal, that is, the measuring section 11, the two transition sections 13 and the two mounting sections 12 are overlapped and equal in length in the second direction, so that the resistance can be reduced, the rectifying effect is achieved, the manufacturing process of the whole measuring pipe 1 is facilitated, the structural strength of the whole measuring pipe 1 is ensured, and the installation and assembly of the whole measuring pipe 1 and other structures of the electromagnetic flowmeter are facilitated.

Preferably, referring to fig. 2 and fig. 3, in the present embodiment, the measuring section 11, the two transition sections 13 and the two mounting sections 12 are integrally formed, so that the whole measuring pipe 1 has a low manufacturing cost and a good sealing performance inside the pipe. It is understood that in other embodiments of the present invention, the measuring section 11, the two transition sections 13 and the two mounting sections 12 may be formed separately and then connected by welding or other methods to form a density connection, which is not limited herein.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The electromagnetic flowmeter is characterized by comprising a measuring guide pipe, a magnetic circuit system and an induction electrode, wherein the measuring guide pipe comprises a measuring section, two mounting sections and two transition sections along the length direction, the two mounting sections are respectively and symmetrically arranged at two ends of the measuring section, the two transition sections are respectively connected between two ends of the measuring section and the two mounting sections, and the inner side wall or the outer side wall of each mounting section is circular; the measuring section is flat and is provided with two first side walls oppositely arranged along a first direction and two second side walls oppositely arranged along a second direction along the circumferential direction of the measuring section, the first direction is vertical to the second direction, the cross sections of the two first side walls and the two second side walls are both curved surfaces, the second side walls are connected between the two first side walls and are respectively connected with first connecting points and second connecting points with the two first side walls, the two first connecting points and the two second connecting points are positioned on the same rectangle, and the first distance of the two first connecting points along the second direction is greater than the second distance of the first connecting points and the second connecting points along the first direction; the magnetic circuit system is arranged on the outer sides of the two first side walls and used for generating an alternating magnetic field parallel to the first direction, the two induction electrodes are respectively arranged on the two second side walls in a penetrating mode, and a connecting line between the two induction electrodes is perpendicular to the alternating magnetic field.

2. The electromagnetic flowmeter of claim 1, wherein a ratio of the first distance to the second distance ranges from 3:1 to 3: 2.

3. The electromagnetic flowmeter of claim 2, wherein a ratio of said first distance to said second distance is 2: 1.

4. The electromagnetic flowmeter of claim 1 wherein a cross-section of the first sidewall is concave or convex;

the cross section of the first side wall is a hyperbolic surface;

or the cross section of the first side wall is an ellipsoid;

or the cross section of the first side wall is a circular arc surface.

5. The electromagnetic flowmeter of claim 1, wherein the cross-section of the second sidewall is a circular arc, wherein the second sidewalls have a common center of circle, and wherein the common center of circle is set as a center point of the cross-section of the measurement section.

6. The electromagnetic flowmeter of any one of claims 1 to 5, wherein the two second sidewalls are symmetrically provided with signal electrode holes, the signal electrode holes are located at the middle position of the second sidewalls, the two sensing electrodes are respectively mounted in the signal electrode holes, and the two first sidewalls are symmetrically provided with ground electrode holes, respectively.

7. The electromagnetic flowmeter of any of claims 1-5, further comprising two support plates symmetrically disposed on said first sidewalls or on said transition sections, respectively, and wherein said magnetic circuit system comprises a coil wound on said first sidewalls at a position between said support plates.

8. The electromagnetic flowmeter of any one of claims 1 to 5, wherein the cross-sectional caliber of the mounting section is larger than that of the measuring section, the cross-section of the outer side wall of the mounting section is circular, and the cross-section of the inner side wall of the mounting section is circular, or the cross-section of the inner side wall of the mounting section is formed by sequentially transitionally connecting a plurality of circular arc surfaces;

9. The electromagnetic flowmeter of any of claims 1 to 5, wherein said transition section has a cross-sectional bore that decreases from said measuring section to said mounting section.

10. The electromagnetic flow meter according to any one of claims 1 to 5, wherein the outer diameters of the measuring section, the two transition sections, and the two mounting sections on both sides in the second direction are equal.