Pipeline type electromagnetic flowmeter

Abstract

The utility model relates to the technical field of pipeline flow metering equipment, in particular to a pipeline type electromagnetic flowmeter which comprises a measuring pipe, a lining arranged in the measuring pipe and a meter head arranged on the measuring pipe, two shells of semi-circular ring structures are arranged on the measuring pipe in a sleeved mode, and a first bolt is arranged between the two shells. The two shells are connected through a first bolt, limiting rings are arranged in the two shells, one sides of the limiting rings are installed on the inner walls of the shells, magnet exciting coils are arranged in the limiting rings in a sleeved mode, the two sides of the magnet exciting coils make contact with the shells and the measuring tube respectively, two electrodes are arranged between the two shells and located on the two sides of the shells respectively, and the two electrodes are arranged on the two sides of the shells respectively. The two sides of the two shells are each provided with a sleeve hole of a semicircular structure, the sleeve holes are located in the edges of the shells, and the electrodes are clamped in the sleeve holes. The utility model provides a pipeline type electromagnetic flowmeter which is convenient to maintain an assembled electrode and a magnet exciting coil, reduces interference on the magnet exciting coil, and is used for overcoming the defects in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline flow metering equipment, in particular to a pipeline type electromagnetic flow meter. Background Art

[0002] Flow rate refers to the total volume of fluid passing through a cross-sectional area per unit time. It is a key indicator for measuring fluid flow rate and volume. As an instrument for measuring fluid flow, a flowmeter not only monitors fluid flow but also plays a vital role in ensuring production process safety, assisting with cost analysis, and optimizing process flows. There are many types of flowmeters, including differential pressure flowmeters, electromagnetic flowmeters, turbine flowmeters, and vortex flowmeters. Each type of flowmeter has its own unique operating principle and structural design, resulting in different characteristics and advantages in practical applications. The electromagnetic flowmeter, specifically designed to measure the flow of conductive fluids, deserves special attention. Electromagnetic flowmeters measure flow based on Faraday's law of electromagnetic induction. Specifically, an excitation coil is installed on the outside of a pipe to generate a constant magnetic field. As the conductive fluid flows through the pipe, its motion cuts through the magnetic lines of force, generating an induced electromotive force in the fluid. Since the magnitude of the induced electromotive force is proportional to the fluid's flow rate, by measuring the induced electromotive force generated by the fluid on the electrodes on both sides of the pipe, the fluid's flow rate in the pipe can be calculated, and thus the fluid's delivery rate can be determined. Because the electromagnetic flowmeter's measurement process features no pressure loss, no moving parts, and high reliability, it demonstrates excellent performance and reliability, whether used for liquid flow measurement in industries such as chemical, petroleum, metallurgy, electric power, and water treatment, or in industries with high hygiene requirements such as food and beverages.

[0003] An electromagnetic flowmeter consists of several key components, including a measuring tube, a liner, electrodes, an excitation coil located outside the tube, a housing wrapped around the tube, and a meter head mounted on the tube. The measuring tube is typically made of metal. An insulating liner is placed inside the tube to isolate the magnetic field from the metal pipe in contact with the fluid, preventing short circuits and protecting the inner cavity of the tube, thereby extending the tube's service life. However, when assembling the measuring electrodes, holes must be drilled in the tube to allow them to penetrate the inner cavity of the liner. This allows the electrodes to come into direct contact with the conductive fluid conveyed within the liner, enabling them to sense changes in the fluid's electric field and accurately measure the flow rate by calculating these changes. However, over extended use, the electrodes, inserted into the inner cavity of the liner, are inevitably subjected to continuous impact from the fluid. This impact causes gradual wear of the electrodes, affecting their ability to accurately sense changes in the fluid's electric field. To ensure reliable measurement results, regular electrode maintenance and inspection are essential. However, the cumbersome installation and removal of the electrodes makes electrode maintenance difficult. Electrode maintenance is not only time-consuming and labor-intensive, but may also require specialized personnel, increasing maintenance costs. Furthermore, because the electrodes and excitation coil are located within the housing, the wires connecting the electrodes inevitably become entangled in the excitation coil during installation and maintenance. This interferes with the magnetic field generated by the excitation coil, affecting flow measurement accuracy. Therefore, maintaining the assembled electrodes and excitation coil to minimize interference with the excitation coil has become a critical issue. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the utility model provides a pipeline electromagnetic flowmeter which facilitates maintenance of assembled electrodes and excitation coils and reduces interference to the excitation coils, thereby overcoming the defects in the prior art.

[0005] The technical solution adopted by the utility model is: a pipeline electromagnetic flowmeter, including a measuring tube, a lining arranged in the measuring tube and a header arranged on the measuring tube, the measuring tube is provided with two shells with semicircular ring structures, a first bolt is provided between the two shells, the two shells are connected by the first bolt, a limiting ring is provided in the two shells, one side of the limiting ring is installed on the inner wall of the shell, an excitation coil is provided in the limiting ring, the two sides of the excitation coil are respectively in contact with the shell and the measuring tube, two electrodes are provided between the two shells, the two electrodes are respectively located on both sides of the shell, a semicircular structured hole is opened on both sides of the two shells, the hole is located at the edge of the shell, and the electrode is clamped in the hole.

[0006] Preferably, the measuring tube is provided with two semi-circular ring structure shells, and the two shells are respectively installed in the two shells. A fixing plate is provided on both sides of the two shells, and one side of the fixing plate is installed at the edge of the shell. A sleeve hole is opened on the fixing plate, and a second bolt is installed in the sleeve hole. A nut is threadedly installed on the second bolt. The fixing plates provided on the two shells are clamped on the second bolt through the nut. A support tube is provided on one of the shells, and one end of the support tube is installed on the shell. The inner cavity of the support tube is connected to the inner cavity of the shell, and the other end of the support tube is connected to the meter head.

[0007] Preferably, a fixing sleeve made of elastic material is respectively installed on both sides of the outer shell or shell. The fixing sleeve adopts a semicircular ring structure. The fixing sleeve is installed on the measuring tube. The thickness of the fixing sleeve is not less than the gap distance between the outer shell or shell and the measuring tube. The fixing sleeve is clamped on the measuring tube through the outer shell or shell.

[0008] Preferably, the top of the support tube and the bottom of the meter head are respectively provided with flanges, the flanges are mounted on the support tube or the meter head, and the support tube and the meter head are connected via the flanges.

[0009] Preferably, the electrode is interference-fitted with a limit sleeve made of an insulating elastic material, the measuring tube and the lining are respectively provided with through holes, the two sides of the limit sleeve are interference-fitted in the sleeve hole and the through hole respectively, a limit plate is provided on the outside of the limit sleeve, one side of the limit plate is in contact with the electrode, the limit plate and the limit sleeve are an integrated structure, the diameter of the limit plate is not less than the outer wall diameter of the limit sleeve, and the other side of the limit plate is in contact with the inner wall of the outer shell.

[0010] Preferably, the two sides of the shell are respectively provided with fixing holes, the fixing holes are located on the outside of the sleeve holes, a fixing tube is provided in the fixing hole, one end of the fixing tube is installed on the fixing hole, the fixing tube is located in the shell, the inner cavity of the fixing tube is provided with a threaded layer, and the first bolt is threadedly sleeved on the fixing tube.

[0011] Preferably, the shell outside the excitation coil is provided with a through hole, the external shape of the excitation coil is consistent with the inner shape of the limiting ring, and a guide groove is provided on the side of the limiting ring away from the shell. The guide groove is provided on the inner wall of the limiting ring, and the groove diameter of the guide groove gradually increases in the direction away from the shell.

[0012] The present invention has the following beneficial effects: First, the present invention limits the installation position of the excitation coil by providing a limiting ring, and uses the housing to squeeze the excitation coil so that the excitation coil is attached to the measuring tube, thereby creating a closed space for the excitation coil, preventing the wire from being entangled in the excitation coil, and thus reducing interference with the excitation coil. Furthermore, the present invention provides a sleeve hole in the housing to clamp the electrode, thereby strengthening the fixing effect of the electrode. The first bolt is provided to facilitate the disassembly of the housing, thereby facilitating maintenance of the excitation coil and the electrode 8.

[0013] Secondly, the present invention assembles the two shells onto the measuring tube by providing a second bolt and nut, so that the shell forms a sealed inner cavity. The wires connecting the meter head to the electrode or the excitation coil pass through the inner cavity of the shell to protect the wires, and the shell or the housing is fixed to the measuring tube by providing a fixing sleeve. In addition, the present invention connects the meter head and the shell by providing a flange and a support tube, thereby facilitating the assembly and disassembly of the meter head. The electrode is clamped in the through hole and the sleeve hole by providing a limiting sleeve to prevent the electrode from short-circuiting. The outer side of the electrode is fixed by providing a limiting plate to meet the assembly requirements of the electrode, and insulation is provided between the electrode and the shell and the shell.

[0014] Furthermore, the present invention facilitates the installation of the first bolt on the housing by providing a fixing tube, thereby connecting the two housings with the fixing tube and the first bolt. The provided through-hole facilitates the insertion of the wire connected to the excitation coil, thereby facilitating the electrical connection between the excitation coil and the meter head. Furthermore, the guide groove provided on the retaining ring facilitates the installation of the excitation coil within the retaining ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the present utility model.

[0016] Figure 2 This is a three-dimensional cross-sectional view of the utility model without the meter head installed.

[0017] Figure 3 for Figure 2 Enlarged schematic diagram of point A in the middle.

[0018] Figure 4 It is an exploded view of the assembly of the housing, the first bolt, the excitation coil, the electrode, the fixing sleeve and the limiting sleeve in the utility model.

[0019] Figure 5 This is an exploded view of the assembly of the two shells and the fixing sleeve in the utility model.

[0020] Figure 6 This is an exploded view of the assembly of the meter head and the housing in this utility model. DETAILED DESCRIPTION

[0021] like Figures 1 to 5 As shown, a pipeline electromagnetic flowmeter includes a measuring tube 1, a lining 2 arranged in the measuring tube 1 and a head 3 arranged on the measuring tube 1, the measuring tube 1 is provided with two semicircular ring-shaped shells 4, a first bolt 5 is provided between the two shells 4, and the two shells 4 are connected by the first bolt 5, a limit ring 6 is provided in each of the two shells 4, one side of the limit ring 6 is installed on the inner wall of the shell 4, an excitation coil 7 is provided in the limit ring 6, and the two sides of the excitation coil 7 are respectively in contact with the shell 4 and the measuring tube 1, two electrodes 8 are provided between the two shells 4, the two electrodes 8 are respectively located on both sides of the shell 4, and a semicircular hole 9 is opened on both sides of the two shells 4, the hole 9 is located at the edge of the shell 4, and the electrode 8 is clamped in the hole 9, so that the excitation coil 7 and the electrode 8 are assembled to the measuring tube 1 using the shell 4 to avoid interference of the wire on the excitation coil 7, and the shell 4 is conveniently installed and removed by twisting the first bolt 5, thereby facilitating maintenance of the excitation coil 7 and the electrode 8.

[0022] In this embodiment, the measuring tube 1 is provided with two semi-circular ring-shaped shells 10, and the two shells 4 are respectively installed in the two shells 10. A fixing plate 11 is provided on both sides of the two shells 10. One side of the fixing plate 11 is installed at the edge of the shell 10. A sleeve hole 9 is opened on the fixing plate 11. A second bolt 12 is installed in the sleeve hole 9. A nut 13 is threadedly installed on the second bolt 12. The fixing plates 11 provided on the two shells 10 are clamped on the second bolt 12 by the nut 13. One of the shells 10 is provided with a support tube 14. One end of the support tube 14 is installed on the shell 10. The inner cavity of the support tube 14 is connected to the inner cavity of the shell 10. The other end of the support tube 14 is connected to the meter head 3, thereby supporting the meter head 3. The wires connecting the meter head 3 and the electrode 8 or the excitation coil 7 pass through the inner cavity of the shell 10. The outer side of the electrode 8 is located in the inner cavity of the shell 10, so that the closed shell 10 is used to protect the wires connected to the electrode 8 or the excitation coil 7 and the outer side of the electrode 8.

[0023] Specifically, a fixing sleeve 15 made of elastic material is respectively installed on both sides of the outer shell 10 or the shell 4. The fixing sleeve 15 adopts a semicircular ring structure. The fixing sleeve 15 is installed on the measuring tube 1. The thickness of the fixing sleeve 15 is not less than the gap distance between the outer shell 10 or the shell 4 and the measuring tube 1. The fixing sleeve 15 is clamped on the measuring tube 1 through the outer shell 10 or the shell 4, so that the fixing sleeve 15 is interference-fitted between the outer shell 10 or the shell 4 and the measuring tube 1, thereby fixing the outer shell 10 or the shell 4 to the measuring tube 1.

[0024] Please refer again Figure 6The top of the support tube 14 and the bottom of the meter head 3 are respectively provided with flanges 16, which are installed on the support tube 14 or the meter head 3. The support tube 14 and the meter head 3 are connected through the flange 16, so as to facilitate the loading and unloading of the meter head 3 and the support tube 14 to meet the maintenance needs.

[0025] Please refer again Figures 2 to 4 The electrode 8 is interference-fitted with a limit sleeve 17 made of an insulating elastic material, and the measuring tube 1 and the liner 2 are respectively provided with through holes 18. The two sides of the limit sleeve 17 are interference-fitted in the sleeve hole 9 and the through hole 18 respectively. A limit plate 19 is provided on the outside of the limit sleeve 17. One side of the limit plate 19 contacts the electrode 8. The limit plate 19 and the limit sleeve 17 are an integrated structure. The diameter of the limit plate 19 is not less than the outer wall diameter of the limit sleeve 17. The other side of the limit plate 19 contacts the inner wall of the shell 10, thereby squeezing and fixing the electrode 8 on the liner 2 to facilitate direct contact between the electrode 8 and the conductive fluid, thereby measuring the induced electromotive force.

[0026] In this embodiment, fixing holes 20 are respectively provided on both sides of the shell 4. The fixing holes 20 are located on the outside of the sleeve hole 9. A fixing tube 21 is provided in the fixing hole 20. One end of the fixing tube 21 is installed on the fixing hole 20. The fixing tube 21 is located in the shell 4. The inner cavity of the fixing tube 21 is provided with a threaded layer. The first bolt 5 is threadedly fitted on the fixing tube 21. By threading the first bolt 5 on the fixing tube 21 provided on the two shells 4, the two shells 4 are connected, thereby facilitating the installation of the two shells 4 on the measuring tube 1.

[0027] Specifically, the shell 4 on the outside of the excitation coil 7 is provided with a through-hole 22, which is used to pass through the wire of the excitation coil 7, so as to facilitate the use of the wire to electrically connect the excitation coil 7 with the meter head 3. The external shape of the excitation coil 7 is consistent with the inner cavity shape of the limiting ring 6. The limiting ring 6 is provided with a guide groove 23 on the side away from the shell 4. The guide groove 23 is provided on the inner wall of the limiting ring 6. The groove diameter of the guide groove 23 gradually increases in the direction away from the shell 4, so as to facilitate guiding the excitation coil 7 to be installed in the limiting ring 6.

[0028] The assembly method of this product is as follows: Figures 1 to 6As shown, first, the electrode 8 is interference fit within the limiting sleeve 17, ensuring that one side of the electrode 8 is in contact with the limiting plate 19. One side of the limiting sleeve 17 is interference fit within the pre-opened through-holes 19 in the measuring tube 1 and the liner 2, thereby completing the preliminary fixation of the electrode 8. Next, the excitation coil 7 is placed within the limiting ring 6, allowing the wires connected to the excitation coil 7 to pass through the through-holes 22. The fixing sleeve 15 is then fitted within the housing 4, ensuring that the housing 4 is in contact with the excitation coil 7. The housing 4 is then fitted onto the measuring tube 1 and tightened onto the fixing tube 21 with the first bolt 5 to complete the installation of the housing 4 on the measuring tube 1. Next, take another fixing sleeve 15 and fit it inside the outer shell 10. Lead the wires connecting the excitation coil 7 and the electrode 8 from the support tube 14. By fitting the outer shell 10 onto the measuring tube 1, the housing 4 is positioned inside the outer shell 10. At the same time, the limit plate 19 contacts the inner wall of the outer shell 10. Then, use the second bolt 12 and nut 13 to clamp the fixing plate 11 provided on the outer shell 10 to install the outer shell 10 on the measuring tube 1. Finally, install the wires connecting the excitation coil 7 and the electrode 8 on the meter head 3, and connect the meter head 3 and the support tube 14 with the flange 16 to complete the assembly of this product.

[0029] In this embodiment, the installation position of the excitation coil 7 is restricted by the provided limiting ring 6, and the excitation coil 7 is squeezed by the housing 4 so that the excitation coil 7 is attached to the measuring tube 1, thereby creating a closed space for the excitation coil 7, preventing the wire from being entangled in the excitation coil 7, and thus reducing interference with the excitation coil 7. In addition, in this embodiment, a hole is provided in the housing 4 to clamp the electrode 8, thereby strengthening the fixing effect of the electrode 8. The first bolt 5 is provided to facilitate the disassembly of the housing 4, thereby facilitating maintenance of the excitation coil 7 and the electrode 8.

[0030] 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. A pipeline electromagnetic flowmeter, comprising a measuring tube (1), a lining (2) arranged in the measuring tube (1), and a meter head (3) arranged on the measuring tube (1), characterized in that: The measuring tube (1) is provided with two semicircular ring-shaped shells (4), a first bolt (5) is provided between the two shells (4), and the two shells (4) are connected by the first bolt (5). A limiting ring (6) is provided in each of the two shells (4), one side of the limiting ring (6) is mounted on the inner wall of the shell (4), an excitation coil (7) is provided in the limiting ring (6), and both sides of the excitation coil (7) are in contact with the shell (4) and the measuring tube (1), respectively. Two electrodes (8) are provided between the two shells (4), and the two electrodes (8) are respectively located on both sides of the shell (4). A semicircular hole (9) is provided on both sides of the two shells (4), and the hole (9) is located at the edge of the shell (4). The electrode (8) is clamped in the hole (9).

2. The pipeline electromagnetic flowmeter according to claim 1, characterized in that: The measuring tube (1) is provided with two semi-circular ring-shaped housings (10), and the two shells (4) are respectively provided in the two housings (10). A fixing plate (11) is provided on both sides of the two housings (10), and one side of the fixing plate (11) is installed at the edge of the housing (10). A sleeve hole (9) is provided on the fixing plate (11), and a second bolt (12) is installed in the sleeve hole (9). A nut (13) is threadedly installed on the second bolt (12). The fixing plates (11) provided on the two housings (10) are clamped on the second bolt (12) through the nut (13). A support tube (14) is provided on one of the housings (10), and one end of the support tube (14) is installed on the housing (10). The inner cavity of the support tube (14) is connected to the inner cavity of the housing (10), and the other end of the support tube (14) is connected to the meter head (3).

3. The pipeline electromagnetic flowmeter according to claim 2, characterized in that: A fixing sleeve (15) made of elastic material is respectively sleeved on both sides of the outer shell (10) or the housing (4). The fixing sleeve (15) adopts a semi-circular ring structure. The fixing sleeve (15) is sleeved on the measuring tube (1). The thickness of the fixing sleeve (15) is not less than the gap distance between the outer shell (10) or the housing (4) and the measuring tube (1). The fixing sleeve (15) is clamped on the measuring tube (1) through the outer shell (10) or the housing (4).

4. The pipeline electromagnetic flowmeter according to claim 2, characterized in that: The top of the support tube (14) and the bottom of the meter head (3) are respectively provided with flanges (16), the flanges (16) are mounted on the support tube (14) or the meter head (3), and the support tube (14) and the meter head (3) are connected via the flanges (16).

5. The pipeline electromagnetic flowmeter according to claim 2, characterized in that: The electrode (8) is interference-fitted with a limiting sleeve (17) made of an insulating elastic material. The measuring tube (1) and the lining (2) are respectively provided with through holes (18). Both sides of the limiting sleeve (17) are interference-fitted in the sleeve hole (9) and the through hole (18). A limiting plate (19) is provided on the outer side of the limiting sleeve (17). One side of the limiting plate (19) contacts the electrode (8). The limiting plate (19) and the limiting sleeve (17) are an integrated structure. The diameter of the limiting plate (19) is not less than the outer wall diameter of the limiting sleeve (17). The other side of the limiting plate (19) contacts the inner wall of the housing (10).

6. The pipeline electromagnetic flowmeter according to claim 1, characterized in that: The housing (4) is provided with fixing holes (20) on both sides, the fixing holes (20) are located outside the sleeve hole (9), a fixing tube (21) is provided in the fixing hole (20), one end of the fixing tube (21) is mounted on the fixing hole (20), the fixing tube (21) is located in the housing (4), a threaded layer is provided in the inner cavity of the fixing tube (21), and the first bolt (5) is threadedly fitted in the fixing tube (21).

7. The pipeline electromagnetic flowmeter according to claim 1, characterized in that: The shell (4) outside the excitation coil (7) is provided with a through hole (22), the outer shape of the excitation coil (7) is consistent with the inner shape of the limiting ring (6), and the limiting ring (6) is provided with a guide groove (23) on the side away from the shell (4). The guide groove (23) is provided on the inner wall of the limiting ring (6), and the groove diameter of the guide groove (23) gradually increases in the direction away from the shell (4).

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