Electromagnetic flowmeter

Abstract

The utility model relates to an electromagnetic flowmeter which comprises a measuring tube, a shell is arranged on the outer side of the measuring tube, a lining is arranged on the inner side of the measuring tube, connecting flanges are arranged at the two ends of the measuring tube respectively, a pressure measuring assembly and a flow speed collecting electrode are arranged on the measuring tube and the lining, and the pressure measuring assembly is located on the inner side of the shell. The pressure measuring assembly comprises a lining, a pressure tapping pipe arranged on the measuring pipe, a first pressure tapping hole formed in the lining on the outer side of an inner cavity of the pressure tapping pipe, and a connecting sleeve arranged at the end, away from the measuring pipe, of the pressure tapping pipe. The second pressure tapping hole is formed in the connecting sleeve on the outer side of the inner cavity of the pressure tapping pipe; the pressure sensor is arranged in the connecting sleeve at one end, far away from the pressure tapping pipe, of the second pressure tapping hole; and excitation coils are respectively arranged on the measuring tube above the flow velocity acquisition electrode and the measuring tube below the flow velocity acquisition electrode. The flow parameter of the conductive liquid medium can be fed back, and the pressure parameter can be stably fed back. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of flow measurement equipment for conductive liquid media, in particular to an electromagnetic flowmeter. Background Art

[0002] Since the 1950s, electromagnetic flowmeters have been widely used in the petroleum, chemical, water metering, pharmaceutical and other industries due to their high accuracy, wide range, sensitive response and corrosion resistance, and have quickly become one of the most widely used industrial measuring instruments. The basic working principle of electromagnetic flowmeters is Faraday's law of electromagnetic induction. When the measured liquid passes through the measuring tube, it cuts the magnetic flux lines in the magnetic field to generate an induced electromotive force. The induced electromotive force generated between the two measuring electrodes is E=kBDv, which is calculated from the flow rate Q=-πD 2 v / 4, the relationship between flow rate Q and induced electromotive force E is Q=πDE / 4kB. Among them, E is the induced electromotive force, k is a constant coefficient, B is the magnetic induction intensity, D is the width of the pipe inner diameter, and v is the fluid flow rate.

[0003] As the market develops, some customers are demanding electromagnetic flowmeters that can provide pressure feedback in addition to the flow rate parameters provided by the basic electromagnetic flowmeter measurement principle. Existing electromagnetic flowmeters incorporate pressure sensors within the measuring tube, using these sensors to directly provide pressure feedback of the liquid medium passing through the tube. However, direct contact between the liquid medium passing through the tube and the sensing tip of the pressure sensor inevitably generates turbulent flow. While direct pressure sensor installation within the tube can provide pressure feedback, this turbulent flow can cause fluctuations in the pressure feedback parameters. These fluctuations increase with increasing pressure of the liquid medium passing through the tube. Furthermore, the trend of pressure fluctuations is difficult to predict, making it difficult to determine a valid calibration coefficient range when the electromagnetic flowmeter is calibrated by a measurement unit. Therefore, there is room for structural improvement in existing electromagnetic flowmeters capable of providing pressure feedback, enabling more accurate and stable pressure feedback parameters. This would facilitate customer inspection and calibration, thereby meeting market demand and increasing the market adoption of this product. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides an electromagnetic flowmeter capable of feeding back flow parameters of a conductive liquid medium and stably feeding back pressure parameters, so as to overcome the defects in the prior art.

[0005] The technical solution adopted by the utility model is: an electromagnetic flowmeter, including a measuring tube, an outer shell is provided on the outer side of the measuring tube, a lining is provided on the inner side of the measuring tube, connecting flanges are respectively provided at both ends of the measuring tube, a pressure measuring assembly and a flow velocity collection electrode are provided on the measuring tube and the lining, the pressure measuring assembly is located on the inner side of the outer shell, the pressure measuring assembly includes a pressure taking tube provided on the lining and the measuring tube, a first pressure taking hole provided on the lining outside the inner cavity of the pressure taking tube, a connecting sleeve provided on one end of the pressure taking tube away from the measuring tube, a second pressure taking hole provided on the connecting sleeve outside the inner cavity of the pressure taking tube, and a pressure sensor provided in the connecting sleeve at one end of the pressure taking tube away from the second pressure taking hole; an excitation coil is respectively provided on the measuring tube above the flow velocity collection electrode and the measuring tube below the flow velocity collection electrode.

[0006] Preferably, the pressure measuring assembly also includes a guide groove, and the diameter of the circumscribed circle of the pressure taking tube at one end inside the measuring tube gradually decreases as the pressure taking tube gradually moves away from the connecting sleeve. The pressure taking tube at one end inside the measuring tube is installed on the inside of the guide groove, and the shape of the guide groove matches the shape of the pressure taking tube at one end inside the measuring tube. The guide groove is located on the side of the lining close to the measuring tube, and the central axis of the first pressure taking hole, the central axis of the pressure taking tube and the central axis of the second pressure taking hole are located on the same axis.

[0007] Preferably, there are several pressure measuring assemblies, the first pressure hole in each pressure measuring assembly is not lower than the height position of the central axis of the measuring tube, and the angle between the central axis of the pressure taking tube and the central axis of the measuring tube is not less than 0 degrees.

[0008] Preferably, the pressure measuring assembly further comprises a connecting hole provided on one end of the connecting sleeve near the measuring tube and a first sealing gasket provided between the connecting sleeve and the pressure taking tube. The end of the pressure taking tube near the connecting sleeve is installed on the connecting hole, an internal thread is provided in the connecting hole, an external thread is provided on the end of the pressure taking tube near the connecting sleeve, and the end of the pressure taking tube near the connecting sleeve is threadedly connected to the connecting hole.

[0009] Preferably, it also includes an electrode mounting assembly, which includes a first mounting hole opened in the middle of the measuring tube, a second mounting hole opened on the lining inside the first mounting hole, and a mounting tube arranged on the measuring tube outside the first mounting hole. The number of the electrode mounting assemblies is two, and the two electrode mounting assemblies are symmetrically arranged on the measuring tube, and each of the electrode mounting assemblies is correspondingly installed with a flow rate collection electrode.

[0010] Preferably, the electrode mounting assembly includes a second sealing ring arranged between the mounting tube and the corresponding flow velocity collection electrode. The cross-section of the flow velocity collection electrode adopts a convex structure consisting of a large head end and a small head end. The inner cavity of the mounting tube and the partial shape of the flow velocity collection electrode are matched. The second sealing ring is mounted on the small head end of the flow velocity collection electrode. The second sealing ring is located between the large head end of the flow velocity collection electrode and the mounting tube.

[0011] The beneficial effects of the present invention are as follows: first, the present invention realizes that while feeding back the flow parameters of the conductive liquid medium, the pressure carried by the liquid medium passing through the measuring tube is transmitted to the pressure sensor through the pressure channel composed of the first pressure hole, the pressure tube and the second pressure hole. After rectification through the pressure channel composed of the first pressure hole, the pressure tube and the second pressure hole, the pressure parameters tend to be more stable, and after correction, the pressure parameters of the liquid medium passing through the measuring tube that are closer to the true value are fed back.

[0012] Secondly, the pressure measuring assembly described in the present invention also includes a connecting hole set on one end of the connecting sleeve near the measuring tube and a first sealing gasket set between the connecting sleeve and the pressure taking tube. After installing the first sealing gasket, the gap between the connecting sleeve and the pressure taking tube is reduced.

[0013] Again, the electrode mounting assembly described in the present invention includes a second sealing ring provided between the mounting tube and the corresponding flow velocity collection electrode. Installing the second sealing ring facilitates narrowing the gap between the mounting tube and the flow velocity collection electrode.

[0014] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved work efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Figure 2 for Figure 1 A partially enlarged schematic diagram of detail A.

[0017] Figure 3 for Figure 1 A partially enlarged schematic diagram of detail B.

[0018] Figure 4 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0019] like Figures 1 to 4As shown, an electromagnetic flowmeter includes a measuring tube 1, an outer shell 2 is provided on the outer side of the measuring tube 1, a converter is provided on the outer shell 2, a lining 3 is provided on the inner side of the measuring tube 1, the lining 3 is made of rubber, and connecting flanges 4 are respectively provided at both ends of the measuring tube 1, a pressure measuring assembly and a flow velocity collection electrode 5 are provided on the measuring tube 1 and the lining 3, and the pressure measuring assembly is located on the inner side of the outer shell 2, and the pressure measuring assembly includes a pressure taking tube 6 provided on the lining 3 and the measuring tube 1, a first pressure taking hole 7 provided on the lining 3 outside the inner cavity of the pressure taking tube 6, a connecting sleeve 8 provided on the end of the pressure taking tube 6 away from the measuring tube 1, a second pressure taking hole 9 provided on the connecting sleeve 8 outside the inner cavity of the pressure taking tube 6, and a pressure sensor 10 provided in the connecting sleeve 8 at the end of the second pressure taking hole 9 away from the pressure taking tube 6; an excitation coil 11 is respectively provided on the measuring tube 1 above the flow velocity collection electrode 5 and on the measuring tube 1 below the flow velocity collection electrode 5.

[0020] The pressure measuring assembly also includes a guide groove 12. The pressure-taking tube 6 includes a positioning portion and a connecting portion. The positioning portion of the pressure-taking tube 6 is located inside the measuring tube 1, and the connecting portion of the pressure-taking tube 6 is located on the measuring tube 1. The end of the positioning portion of the pressure-taking tube 6 away from the measuring tube 1 gradually becomes smaller as the positioning portion of the pressure-taking tube 6 gradually moves away from the connecting sleeve 8. The positioning portion of the pressure-taking tube 6 is located inside the measuring tube 1 and is installed inside the guide groove 12. The shape of the guide groove 12 matches the shape of the positioning portion of the pressure-taking tube 6 located inside the measuring tube 1. The guide groove 12 is located on the side of the liner 3 near the measuring tube 1. The central axis of the first pressure-taking hole 7, the central axis of the pressure-taking tube 6, and the central axis of the second pressure-taking hole 9 are located on the same axis. This facilitates the use of the positioning portion of the pressure-taking tube 6 to locate the position of the guide groove 12. Since the liner 3 is made of rubber, which is a relatively good water-proof material and has elasticity, the installation position of the liner 3 can be located. Furthermore, the number of the pressure measuring assemblies is several, and preferably the number of the pressure measuring assemblies is two; this facilitates the two pressure measuring assemblies to feedback pressure parameters respectively. When the pressure parameters fed back by the two pressure measuring assemblies are both within the preset range, it can be determined that the two pressure measuring assemblies are both in normal operation. When the parameters fed back by the two pressure measuring assemblies differ too much, it is necessary to repair the two pressure measuring assemblies, and then determine which pressure measuring assembly has a fault. After troubleshooting, it can be put back into use, thereby improving the reliability of data feedback. Furthermore, the first pressure taking hole 7 in each pressure measuring assembly is not lower than the height position of the central axis of the measuring tube 1, the angle between the central axis of the pressure taking tube 6 and the central axis of the measuring tube 1 is not less than 0 degrees, and the positioning portion of the pressure taking tube 6 is located below the connecting sleeve 8. Since the measured liquid medium passing through the inner cavity of the measuring tube 1 may contain particulate matter, although this product has a first pressure hole 7 on the lining 3, the measured liquid medium does not directly pass through the pressure channel composed of the first pressure hole 7, the pressure tube 6 and the second pressure hole 9, but if particulate matter enters the pressure channel composed of the first pressure hole 7, the pressure tube 6 and the second pressure hole 9, the gravity of the particulate matter itself combined with the installation direction of the pressure tube 6 can be used to cause the particulate matter to be discharged from the pressure channel composed of the first pressure hole 7, the pressure tube 6 and the second pressure hole 9.

[0021] The pressure measuring assembly also includes a connecting hole 13 provided on the end of the connecting sleeve 8 near the measuring tube 1, and a first sealing gasket 14 provided between the connecting sleeve 8 and the pressure-taking tube 6. The end of the pressure-taking tube 6 near the connecting sleeve 8 is mounted in the connecting hole 13, which has an internal thread. The end of the pressure-taking tube 6 near the connecting sleeve 8 is provided with an external thread, and the end of the pressure-taking tube 6 near the connecting sleeve 8 is threadedly connected to the connecting hole 13. This facilitates the removal of the connecting sleeve 8 from the pressure-taking tube 6, and thus the corresponding pressure sensor 10, for easy maintenance. Installation of the first sealing gasket 14 also reduces the gap between the connecting sleeve 8 and the pressure-taking tube 6.

[0022] This product also includes an electrode mounting assembly, which includes a first mounting hole 15 defined in the center of the measuring tube 1, a second mounting hole 16 defined in the lining 3 inside the first mounting hole 15, and a mounting tube 17 provided on the measuring tube 1 outside the first mounting hole 15. Two electrode mounting assemblies are symmetrically positioned on the measuring tube 1, each mounting assembly corresponding to a flow velocity collection electrode 5. Installing the electrode mounting assembly facilitates the installation of the flow velocity collection electrodes 5. Specifically, the electrode mounting assembly includes a second sealing ring 18 positioned between the mounting tube 17 and the corresponding flow velocity collection electrode 5. The cross-section of each flow velocity collection electrode 5 is a convex-shaped structure consisting of a large end and a small end. The inner cavity of the mounting tube 17 matches the shape of a portion of the flow velocity collection electrode 5. The large end of the flow velocity collection electrode 5 is threadedly connected to the mounting tube 17. The second sealing ring 18 fits over the small end of the flow velocity collection electrode 5 and is located between the large end of the flow velocity collection electrode 5 and the mounting tube 17. Installing the second sealing ring 18 facilitates narrowing the gap between the installation tube 17 and the flow velocity collection electrode 5 .

[0023] The method of using this product is as follows: Figures 1 to 4 As shown, the following steps are included:

[0024] After installing this product in the pre-set installation location and the system is in normal operation, the upstream liquid medium enters the inner cavity of the liner 3 through the inlet end of the measuring tube 1. The liquid medium then continues to enter the magnetic field between the excitation coil 11 above and below the flow velocity acquisition electrode 5. The liquid medium cuts the magnetic lines of force and generates an induced electromotive force. The two flow velocity acquisition electrodes 5 collect this electromotive force and transmit it to the converter, which converts it into a first electrical signal for output recognition. Simultaneously, the liquid medium in the measuring tube 1 transmits its pressure through the pressure channel formed by the first pressure tapping port 7, the pressure tapping tube 6, and the second pressure tapping port 9 to the pressure sensor 10, which then provides feedback on the pressure parameter. During this process, the turbulent flow generated by the liquid medium due to pressure fluctuations is rectified through the pressure channel formed by the first pressure tapping port 7, the pressure tapping tube 6, and the second pressure tapping port 9, thereby stabilizing the pressure parameter provided by the pressure sensor 10. After correction, the pressure parameter provided by the pressure sensor 10 can reflect the actual pressure of the fluid medium passing through the inner cavity of the measuring tube 1.

[0025] Through this embodiment, it is achieved that while feeding back the flow parameters of the conductive liquid medium, the pressure carried by the liquid medium passing through the measuring tube 1 is transmitted to the pressure sensor 10 through the pressure channel composed of the first pressure hole 7, the pressure tube 6 and the second pressure hole 9. After rectification by the pressure channel composed of the first pressure hole 7, the pressure tube 6 and the second pressure hole 9, the pressure parameters tend to be more stable, and after correction, the pressure parameters of the liquid medium passing through the measuring tube 1 that are closer to the true value are fed back.

[0026] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. An electromagnetic flowmeter, comprising a measuring tube (1), a housing (2) provided on the outer side of the measuring tube (1), a lining (3) provided on the inner side of the measuring tube (1), and connecting flanges (4) provided at both ends of the measuring tube (1), characterized in that: The measuring tube (1) and the lining (3) are provided with a pressure measuring assembly and a flow rate collecting electrode (5), the pressure measuring assembly is located on the inner side of the shell (2), and the pressure measuring assembly comprises a pressure taking tube (6) provided on the lining (3) and the measuring tube (1), a first pressure taking hole (7) provided on the lining (3) outside the inner cavity of the pressure taking tube (6), a connecting sleeve (8) provided on one end of the pressure taking tube (6) away from the measuring tube (1), a second pressure taking hole (9) provided on the connecting sleeve (8) outside the inner cavity of the pressure taking tube (6), and a pressure sensor (10) provided in the connecting sleeve (8) at one end of the second pressure taking hole (9) away from the pressure taking tube (6); an excitation coil (11) is provided on the measuring tube (1) above the flow rate collecting electrode (5) and on the measuring tube (1) below the flow rate collecting electrode (5), respectively.

2. The electromagnetic flowmeter according to claim 1, characterized in that: The pressure measuring assembly further comprises a guide groove (12), the diameter of the circumscribed circle of the pressure taking tube (6) located at one end inside the measuring tube (1) gradually decreases as the pressure taking tube (6) gradually moves away from the connecting sleeve (8), the pressure taking tube (6) located at one end inside the measuring tube (1) is installed inside the guide groove (12), the shape of the guide groove (12) matches the shape of the pressure taking tube (6) located at one end inside the measuring tube (1), the guide groove (12) is located on a side of the lining (3) close to the measuring tube (1), and the central axis of the first pressure taking hole (7), the central axis of the pressure taking tube (6) and the central axis of the second pressure taking hole (9) are located on the same axis.

3. The electromagnetic flowmeter according to claim 2, characterized in that: The number of the pressure measuring assemblies is several, the first pressure hole (7) in each pressure measuring assembly is not lower than the height position of the central axis of the measuring tube (1), and the angle between the central axis of the pressure taking tube (6) and the central axis of the measuring tube (1) is not less than 0 degrees.

4. The electromagnetic flowmeter according to claim 1, wherein: The pressure measuring assembly further comprises a connecting hole (13) provided on one end of the connecting sleeve (8) close to the measuring tube (1) and a first sealing gasket (14) provided between the connecting sleeve (8) and the pressure taking tube (6); the end of the pressure taking tube (6) close to the connecting sleeve (8) is mounted on the connecting hole (13); an internal thread is provided in the connecting hole (13); an external thread is provided on the end of the pressure taking tube (6) close to the connecting sleeve (8); and the end of the pressure taking tube (6) close to the connecting sleeve (8) is threadedly connected to the connecting hole (13).

5. The electromagnetic flowmeter according to claim 1, characterized in that: The apparatus further includes an electrode mounting assembly, wherein the electrode mounting assembly includes a first mounting hole (15) provided in the middle of the measuring tube (1), a second mounting hole (16) provided on the lining (3) inside the first mounting hole (15), and a mounting tube (17) provided on the measuring tube (1) outside the first mounting hole (15). The number of the electrode mounting assemblies is two, and the two electrode mounting assemblies are symmetrically arranged on the measuring tube (1), and each of the electrode mounting assemblies is correspondingly installed with a flow rate collection electrode (5).

6. The electromagnetic flowmeter according to claim 5, characterized in that: The electrode mounting assembly includes a second sealing ring (18) arranged between a mounting tube (17) and a corresponding flow velocity collection electrode (5); the cross section of the flow velocity collection electrode (5) adopts a convex structure consisting of a large head end and a small head end; the inner cavity of the mounting tube (17) matches the shape of a part of the flow velocity collection electrode (5); the second sealing ring (18) is sleeved on the small head end of the flow velocity collection electrode (5); and the second sealing ring (18) is located between the large head end of the flow velocity collection electrode (5) and the mounting tube (17).

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