Electromagnetic flowmeter

Abstract

The utility model belongs to the technical field of fluid measurement, and particularly relates to an electromagnetic flowmeter. The electromagnetic flowmeter comprises a measuring conduit, a magnetic circuit system and at least two induction electrodes, the measuring conduit is provided with a cavity allowing fluid to penetrate through, the magnetic circuit system is used for generating a magnetic field distributed in the cavity, and the induction electrodes penetrate through the wall of the measuring conduit and extend into the cavity. The pipe wall is provided with a through hole allowing the induction electrode to penetrate through, the outer wall of the induction electrode is provided with a first limiting structure surrounding the induction electrode in the circumferential direction, the inner wall of the through hole is provided with a second limiting structure surrounding the induction electrode in the circumferential direction, and the first limiting structure is matched with the second limiting structure. The sensing electrode is arranged in the through hole to limit the sensing electrode to rotate around the axis of the through hole, and the sensing electrode and the measuring catheter are of an integrated injection molding structure. The electromagnetic flowmeter can solve the problems of how to reduce the installation cost of the induction electrode and how to improve the measurement precision of the electromagnetic flowmeter.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid measurement, and in particular relates to an electromagnetic flowmeter. Background Art

[0002] Electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow rate of conductive fluid based on the electromotive force induced when the conductive fluid passes through an external magnetic field. The structure of the electromagnetic flowmeter is mainly composed of a magnetic circuit system, a measuring conduit, electrodes, a housing, etc. The magnetic circuit system is used to generate a uniform DC or AC magnetic field, the measuring conduit is used to allow the conductive liquid to pass through, and the electrodes are used to draw out the induced potential signal.

[0003] The electrode is usually installed in the wall of the measuring conduit. When installing the electrode, the existing electromagnetic flowmeter usually first drills a hole in the wall and then installs the electrode into the hole. This is not only complicated, but also has high installation costs and poor consistency. In addition, there are installation errors, which cause the electrode to rotate in the hole to a certain extent, thereby affecting the measurement accuracy. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide an electromagnetic flowmeter, aiming to solve the problem of how to reduce the installation cost of the induction electrode and how to improve the measurement accuracy of the electromagnetic flowmeter.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] An electromagnetic flowmeter is provided, comprising a measuring conduit, a magnetic circuit system installed on the measuring conduit, and at least two induction electrodes, wherein the measuring conduit has a cavity for fluid to pass through, the magnetic circuit system is used to generate a magnetic field distributed in the cavity, the induction electrode is penetrated through the tube wall of the measuring conduit and extends into the cavity, the tube wall is provided with a through hole for accommodating the induction electrode to pass through, the outer wall of the induction electrode is provided with a first limiting structure surrounding the circumference, the inner wall of the through hole is provided with a second limiting structure surrounding the circumference, the first limiting structure cooperates with the second limiting structure to limit the rotation of the induction electrode around the axis of the through hole, and the induction electrode and the measuring conduit are an integral injection molding structure.

[0007] In some embodiments, one of the first limiting structure and the second limiting structure is a strip-shaped groove, and the other of the first limiting structure and the second limiting structure is a strip-shaped protrusion, and the strip-shaped protrusion extends into the strip-shaped groove.

[0008] In some embodiments, an annular flange surrounding the outer wall of the sensing electrode is provided along a circumferential direction, the first limiting structure is provided on the outer circumferential surface of the annular flange, a stop protrusion is provided on the inner wall of the through hole, and the annular flange cooperates with the stop protrusion to limit the movement of the sensing electrode along the axis of the through hole.

[0009] In some embodiments, the sensing electrode includes at least two annular flanges, the two annular flanges are spaced apart, and the stop protrusion is clamped between the two annular flanges.

[0010] In some embodiments, the first limiting structure is a strip groove, and the strip groove is an oblique groove.

[0011] In some embodiments, the strip grooves on the two annular flanges have different inclination directions.

[0012] In some embodiments, the inner wall of the through hole is provided with a first limiting protrusion surrounding in the circumferential direction, and the first limiting protrusion and the stop protrusion jointly clamp the annular flange.

[0013] In some embodiments, the electromagnetic flowmeter further includes a first seal mounted on the sensing electrode, the first seal is disposed at an opening of the through hole, and the first seal is sandwiched between the sensing electrode and an inner wall of the through hole.

[0014] In some embodiments, a second sealing member is sandwiched between the two annular flanges.

[0015] In some embodiments, the at least two sensing electrodes include a first electrode and a second electrode, and the first electrode and the second electrode are symmetrical about an axis of the cavity.

[0016] In some embodiments, at least two of the sensing electrodes further include a grounding electrode, and the grounding electrode is disposed beside the first electrode or the second electrode, and the grounding electrode is grounded.

[0017] In some embodiments, the measurement conduit is a nylon piece.

[0018] In some embodiments, the measuring catheter includes a measuring section and two mounting sections symmetrically arranged on both sides of the measuring section, the magnetic circuit system and the induction electrode are arranged in the measuring section, and the inner wall of the mounting section is larger than the inner wall of the measuring section.

[0019] In some embodiments, the measuring catheter further includes a transition section connected between the measuring section and the installation section, and the inner diameter of the transition section gradually increases from the measuring section to the installation section.

[0020] The beneficial effects of the present application are as follows: the sensing electrode and the measuring conduit are an integral injection-molded structure, in which the sensing electrode is embedded in the measuring conduit, eliminating the drilling process, and having a simple process and good consistency, which can save the installation cost of the sensing electrode, and improve the limiting effect of the sensing electrode, and improve the sealing between the sensing electrode and the measuring conduit, and the cooperation of the first limiting structure and the second limiting structure can effectively prevent the sensing electrode from rotating in the circumferential direction, so that the sensing electrode can stably sense the fluid cutting the alternating magnetic field and lead out the induced electromotive force, so that the electromagnetic flowmeter can accurately measure the liquid flow, reduce errors, and improve measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the electromagnetic flowmeter provided in the embodiment of the present application;

[0023] Figure 2 It is a partial structural schematic diagram of the electromagnetic flowmeter provided in the embodiment of the present application;

[0024] Figure 3 yes Figure 2 A schematic diagram of the cross-section structure in one direction;

[0025] Figure 4 yes Figure 3 A schematic structural diagram of another embodiment;

[0026] Figure 5 is a schematic diagram of the overall structure of a sensing electrode provided in one of the embodiments of the present application;

[0027] Figure 6 is a schematic diagram of the overall structure of a sensing electrode provided in another embodiment of the present application;

[0028] Figure 7 yes Figure 2 Schematic diagram of the cross-section structure in another direction.

[0029] Among them, the reference numerals in the figure are:

[0030] 10. Measuring catheter;

[0031] 11. Measurement section;

[0032] 12. Installation section;

[0033] 14. Stop protrusion;

[0034] 15. First limiting protrusion;

[0035] 16. Second limiting protrusion;

[0036] 17. Through hole;

[0037] 20. Sensing electrode;

[0038] 21. a first electrode;

[0039] 22. a second electrode;

[0040] 23. Ground electrode;

[0041] 24. annular flange;

[0042] 241, first limiting structure;

[0043] 31. a first sealing member;

[0044] 32. Second sealing member;

[0045] 40. Shell;

[0046] 50. Fixed frame;

[0047] 60. Magnetic circuit system. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] See also Figures 1 to 7 An embodiment of the present application provides an electromagnetic flowmeter, which includes a measuring conduit 10, a magnetic circuit system 60 installed on the measuring conduit 10, and at least two induction electrodes 20. The measuring conduit 10 has a cavity for fluid to pass through. The magnetic circuit system 60 is used to generate a magnetic field distributed in the cavity. The induction electrode 20 is penetrated through the tube wall of the measuring conduit 10 and extends into the cavity. The tube wall is provided with a through hole 17 for the induction electrode 20 to pass through. The outer wall of the induction electrode 20 is provided with a first limiting structure 241 surrounding the circumference, and the inner wall of the through hole 17 is provided with a second limiting structure surrounding the circumference. The first limiting structure 241 cooperates with the second limiting structure to limit the rotation of the induction electrode 20 around the axis of the through hole 17. The induction electrode 20 and the measuring conduit 10 are an integral injection molding structure.

[0053] The sensing electrode 20 and the measuring conduit 10 of the present application are an integral injection-molded structure. At this time, the sensing electrode 20 is embedded in the measuring conduit 10, eliminating the drilling process, having a simple process and good consistency, saving the installation cost of the sensing electrode 20, and improving the limiting effect of the sensing electrode 20, and improving the sealing between the sensing electrode 20 and the measuring conduit 10. In addition, the cooperation between the first limiting structure 241 and the second limiting structure can effectively enable the sensing electrode 20 to rotate in the circumferential direction, so that the sensing electrode 20 can stably sense the fluid cutting the alternating magnetic field and lead out the induced electromotive force, thereby enabling the electromagnetic flowmeter to accurately measure the liquid flow, reduce errors, and improve measurement accuracy.

[0054] It can be understood that the sensing electrode 20 and the measuring conduit 10 are an integral injection molding structure, that is, the sensing electrode 20 is installed in a mold, the sensing electrode 20 is used as an insert, and then the measuring conduit 10 and the sensing electrode 20 are integrally formed by injection molding. In the present application, water is injected into the pipe of the measuring conduit 10 to pressurize it at 4MPa to 5MPa, and the connection position between the sensing electrode 20 and the measuring conduit 10 still has good sealing performance.

[0055] In some embodiments, the first limiting structure 241 is a strip-shaped protrusion protruding from the outer wall of the sensing electrode 20, and the second limiting structure is a strip-shaped groove recessed from the inner wall of the through hole 17 toward a direction away from the sensing electrode 20, and the strip-shaped protrusion extends into the strip-shaped groove, so that the rotation of the sensing electrode 20 along the circumferential direction is restricted. It can be understood that in other possible implementations, the first limiting structure 241 can also be a strip-shaped groove recessed from the outer wall of the sensing electrode 20 toward a direction away from the inner wall of the through hole 17, and the second limiting structure is a strip-shaped protrusion protruding from the inner wall of the through hole 17. The present application does not limit the specific structures of the first limiting structure 241 and the second limiting structure, as long as the rotation of the sensing electrode 20 along the circumferential direction can be restricted.

[0056] In some embodiments, Figure 3 As shown, an annular flange 24 surrounding the outer wall of the sensing electrode 20 is provided along the circumferential direction, a first limiting structure 241 is provided on the outer circumferential surface of the annular flange 24, and a stop protrusion 14 is provided on the inner wall of the through hole 17. The annular flange 24 cooperates with the stop protrusion 14 to limit the movement of the sensing electrode 20 along the axis of the through hole 17, thereby effectively preventing the movement of the sensing electrode 20 along the axis direction of the through hole 17, further improving the stability of the sensing electrode 20, so that the sensing electrode 20 can stably sense the fluid cutting magnetic field, so that the electromagnetic flowmeter can accurately measure the liquid flow, reduce errors, and improve measurement accuracy.

[0057] In some embodiments, the stop protrusion 14 extends along the circumference of the through hole 17, that is, the stop protrusion 14 is a whole annular structure, which can increase the contact area between the stop protrusion 14 and the annular flange 24, and further enhance the effect of limiting the axial movement of the sensing electrode 20 along the through hole 17. In other possible implementations, the stop protrusion 14 can also be an arc-shaped strip structure, and multiple stop protrusions 14 are arranged around the circumference and the multiple stop protrusions 14 are arranged at intervals from each other.

[0058] Furthermore, if Figure 3 and Figure 4 As shown, the sensing electrode 20 includes at least two annular flanges 24 , which are spaced apart, and the stop protrusion 14 is clamped between the two annular flanges 24 . Therefore, the movement of the sensing electrode 20 in the direction approaching the cavity and in the direction away from the cavity are both limited by the annular flanges 24 , further ensuring the stability of the sensing electrode 20 .

[0059] In some embodiments, Figure 6 As shown, the first limiting structure 241 is a strip groove, and the strip groove is an inclined groove, that is, the extension direction of the strip groove is inclined relative to the axial direction of the annular flange 24. Specifically, the inclination directions of the strip grooves on the two annular flanges 24 are different, for example, the extension directions of the strip grooves on the two annular flanges 24 can be symmetrical to each other.

[0060] In some embodiments, the inner wall of the through hole 17 is provided with a first limiting protrusion 15 surrounding in the circumferential direction. The first limiting protrusion 15 and the stop protrusion 14 jointly clamp the annular flange 24. The first limiting protrusion 15 is provided at the opening of the through hole 17 away from the cavity. The first limiting protrusion 15 can limit the movement of the sensing electrode 20 along the axis in the direction away from the cavity.

[0061] Furthermore, the inner wall of the through hole 17 is also provided with a second limiting protrusion 16 which surrounds the inner wall along the circumferential direction. The second limiting protrusion 16 and the stop protrusion 14 jointly clamp one of the annular flanges 24. The second limiting protrusion 16 is provided at the opening of the through hole 17 close to the cavity. The second limiting protrusion 16 can limit the movement of the sensing electrode 20 along the axis toward the direction close to the cavity.

[0062] In some embodiments, at least two of the sensing electrodes 20 include a first electrode 21 and a second electrode 22, and the first electrode 21 and the second electrode 22 are symmetrical about the axis of the cavity. The first electrode 21 and the second electrode 22 of the electromagnetic flowmeter are respectively arranged on both sides and facing each other, and the connection line between the first electrode 21 and the second electrode 22 is perpendicular to the direction of the magnetic field generated by the magnetic circuit system 60, which can effectively improve the accuracy of the signal collection of the first electrode 21 and the second electrode 22.

[0063] Furthermore, at least two sensing electrodes 20 further include a grounding electrode 23, which is disposed beside the first electrode 21 or the second electrode 22. The grounding electrode 23 is grounded to form a reference point for measurement, so that the measurement error is reduced.

[0064] In some embodiments, the measuring catheter 10 is a nylon part, that is, the measuring catheter 10 is made of nylon material. Nylon material has high strength and toughness, high tensile strength and compressive strength, is easy to process and mold, and can be made into products of different shapes and specifications through injection molding, extrusion, blow molding, etc., and has low water absorption, so it has good insulation properties, thereby improving measurement accuracy.

[0065] In some embodiments, the electromagnetic flowmeter further includes a first seal 31 sleeved on the sensing electrode 20. The first seal 31 is disposed at an opening position of the through hole 17 away from the cavity. The first seal 31 is sandwiched between the sensing electrode 20 and the inner wall of the through hole 17. The first seal 31 can enhance the sealing of the measuring conduit 10 and prevent water leakage, thereby improving the measurement accuracy.

[0066] In some embodiments, Figure 4 As shown, a second seal 32 is sandwiched between the two annular flanges 24, thereby further enhancing the sealing of the measuring conduit 10. That is, the present application may be provided with the second seal 32, or may not be provided with the second seal 32 and only include the first seal 31. Optionally, the first seal 31 and the second seal 32 are O-rings.

[0067] In some embodiments, Figure 7 As shown, the measuring catheter 10 includes a measuring section 11 and two mounting sections 12 symmetrically arranged on both sides of the measuring section 11, the mounting section 12 is used to connect with an external pipeline, the magnetic circuit system 60 and the induction electrode 20 are arranged in the measuring section 11, the inner diameter of the mounting section 12 is larger than the inner diameter of the measuring section 11, and the inner diameter of the measuring section 11 is smaller, so that the magnetic field generated by the magnetic circuit system 60 is evenly distributed between the first electrode 21 and the second electrode 22, thereby further improving the measurement accuracy.

[0068] In addition, the outer circumference of the installation section 12 can be provided with a threaded section, so that the installation section 12 can be threadedly connected to an external pipe, which is convenient for the installation of the electromagnetic flowmeter. The inner wall or outer circumference of the installation section 12 can be set to be circular to facilitate connection with an external circular pipe.

[0069] In addition, the electromagnetic flowmeter of the present application further includes a fixing frame 50, which is sleeved on the measuring conduit 10. The fixing frame 50 can be used to install the magnetic circuit system 60, so that the working state of the magnetic circuit system 60 is stable and the measurement accuracy is improved. The fixing frame 50 can be integrally formed with the measuring conduit 10, so that the connection between the fixing frame 50 and the measuring conduit 10 is more stable.

[0070] The electromagnetic flowmeter of the present application also includes a housing 40, and a measuring conduit 10 is passed through the housing 40. Both ends of the measuring conduit 10 are exposed outside the housing 40 for easy installation to an external pipeline. The housing 40 is used to isolate external magnetic field interference, thereby further improving the accuracy of the measurement.

[0071] To sum up, the sensing electrode 20 and the measuring catheter 10 of the present application are an integrated injection molding structure. At this time, the sensing electrode 20 is embedded in the measuring catheter 10, eliminating the punching process, the process is simple, the consistency is good, the installation cost of the sensing electrode 20 can be saved, and the limiting effect of the sensing electrode 20 is improved, and the sealing between the sensing electrode 20 and the measuring catheter 10 is improved. In addition, the cooperation between the first limiting structure 241 and the second limiting structure can effectively enable the sensing electrode 20 to rotate in the circumferential direction, so that the sensing electrode 20 can stably sense the fluid cutting the alternating magnetic field and lead out the induced electromotive force, so that the electromagnetic flowmeter can accurately measure the liquid flow, reduce errors, and improve measurement accuracy.

[0072] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An electromagnetic flowmeter, characterized in that: The invention comprises a measuring conduit (10), a magnetic circuit system (60) installed on the measuring conduit (10), and at least two induction electrodes (20); the measuring conduit (10) has a cavity for fluid to pass through; the magnetic circuit system (60) is used to generate a magnetic field distributed in the cavity; the induction electrodes (20) are arranged on the wall of the measuring conduit (10) and extend into the cavity; the wall of the conduit is provided with a through hole (17) for accommodating the induction electrodes (20) to pass through; the outer wall of the induction electrode (20) is provided with a first limiting structure (241) surrounding in the circumferential direction; the inner wall of the through hole (17) is provided with a second limiting structure surrounding in the circumferential direction; the first limiting structure (241) cooperates with the second limiting structure to limit the rotation of the induction electrode (20) around the axis of the through hole (17); the induction electrode (20) and the measuring conduit (10) are an integral injection molding structure.

2. The electromagnetic flowmeter according to claim 1, characterized in that: One of the first limiting structure (241) and the second limiting structure is a strip-shaped groove, and the other of the first limiting structure (241) and the second limiting structure is a strip-shaped protrusion, and the strip-shaped protrusion extends into the strip-shaped groove.

3. The electromagnetic flowmeter according to claim 2, characterized in that: An annular flange (24) surrounding the outer wall of the sensing electrode (20) is provided along a circumferential direction; the first limiting structure (241) is provided on the outer peripheral surface of the annular flange (24); a stop protrusion (14) is provided on the inner wall of the through hole (17); the annular flange (24) cooperates with the stop protrusion (14) to limit the movement of the sensing electrode (20) along the axis of the through hole (17).

4. The electromagnetic flowmeter according to claim 3, characterized in that: The induction electrode (20) comprises at least two annular flanges (24), the two annular flanges (24) are arranged at intervals, and the stop protrusion (14) is clamped between the two annular flanges (24).

5. The electromagnetic flowmeter according to claim 4, characterized in that: The first limiting structure (241) is a strip-shaped groove, and the strip-shaped groove is an oblique groove.

6. The electromagnetic flowmeter according to claim 5, characterized in that: The strip grooves on the two annular flanges (24) have different inclination directions.

7. The electromagnetic flowmeter according to claim 3, characterized in that: The inner wall of the through hole (17) is provided with a first limiting protrusion (15) surrounding in the circumferential direction, and the first limiting protrusion (15) and the stop protrusion (14) jointly clamp the annular flange (24).

8. The electromagnetic flowmeter according to claim 7, characterized in that: The electromagnetic flowmeter further comprises a first sealing member (31) sleeved on the sensing electrode (20), wherein the first sealing member (31) is arranged at the opening position of the through hole (17), and the first sealing member (31) is sandwiched between the sensing electrode (20) and the inner wall of the through hole (17).

9. The electromagnetic flowmeter according to claim 8, characterized in that: A second sealing member (32) is also sandwiched between the two annular flanges (24).

10. The electromagnetic flowmeter according to claim 1, characterized in that: At least two of the sensing electrodes (20) include a first electrode (21) and a second electrode (22), and the first electrode (21) and the second electrode (22) are symmetrical about the axis of the cavity.

11. The electromagnetic flowmeter according to claim 10, characterized in that: At least two of the sensing electrodes (20) further include a grounding electrode (23), wherein the grounding electrode (23) is arranged beside the first electrode (21) or the second electrode (22), and the grounding electrode (23) is grounded.

12. The electromagnetic flowmeter according to any one of claims 1 to 11, characterized in that: The measuring conduit (10) is a nylon part.

13. The electromagnetic flowmeter according to claim 1, characterized in that: The measuring catheter (10) comprises a measuring section (11) and two mounting sections (12) symmetrically arranged on both sides of the measuring section (11); the magnetic circuit system (60) and the induction electrode (20) are arranged in the measuring section (11); and the inner diameter of the mounting section (12) is greater than the inner diameter of the measuring section (11).

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