Electromagnetic flowmeter

Abstract

The invention discloses an electromagnetic flow meter, which relates to the technical field of flow meters, and comprises a test tube, a coil I, a coil II, a coil I, a coil II, a coil I and a coil II, the two electrode assemblies are symmetrically arranged on the test tube, and the two electrode assemblies are perpendicular to the coil I and the coil II; the lining assembly is arranged in the test tube in a sleeving manner; the lining assembly is provided with the first lining and the second lining, rapid replacement is achieved in a detachable connection mode, and the maintenance efficiency is effectively improved; abrasion visualization is achieved through an indicating rod and scales, a transparent protective cover and a humidity sensor are matched, displacement of the second lining can be visually judged through manual inspection, and damage and leakage of the lining assembly can be warned through sudden humidity rise; automatic abrasion judgment of the lining assembly is achieved through three-level early warning of the pressure sensor, an output signal can be directly connected to an industrial control system, early warning is achieved in advance, and sudden shutdown is avoided.

Description

Technical Field

[0001] This invention belongs to the field of flow meter technology, and more specifically, relates to an electromagnetic flow meter. Background Technology

[0002] The electromagnetic flowmeter operates on the principle of Faraday's law of electromagnetic induction. The test tube is a short, non-magnetic alloy tube lined with insulating material. Two electrodes are fixed to the test tube, passing through the tube wall along its diameter, with their tips approximately flush with the inner surface of the lining. When the excitation coil is energized by a bidirectional square wave pulse, it generates a working magnetic field with a magnetic flux density of B in a direction perpendicular to the test tube axis. When a fluid with a certain conductivity flows through the test tube, it cuts the magnetic lines of force, inducing an electromotive force (EMF) E. The EMF E is proportional to the product of the magnetic flux density B, the inner diameter d of the test tube, and the average flow velocity V. The EMF E (flow signal) is detected by the electrodes and transmitted to the converter via a cable. After amplification and processing, the converter displays the fluid flow rate and can output pulse and analog current signals, meeting the flow monitoring and control needs of industrial sites.

[0003] Currently, traditional electromagnetic flowmeters typically use an integral structure for the insulation liner of the test tube, with flanges at both ends to enhance sealing and fixation. However, this design has significant drawbacks: during long-term use, the insulation liner is subjected to fluid erosion and wear, and the flanges become tightly fitted to the inner wall of the test tube, making disassembly difficult. This not only increases the time and labor costs for equipment maintenance but may also affect measurement accuracy due to accelerated wear, and even lead to safety hazards such as liner damage and fluid leakage.

[0004] Furthermore, because the test tube is not transparent, traditional electromagnetic flowmeters lack the function of monitoring the wear degree of the inner lining, which may lead to leakage and short circuits after the inner lining wears out. Therefore, an electromagnetic flowmeter is proposed to solve the technical problem of inconvenient replacement of the insulating lining, thereby improving the reliability and maintenance efficiency of the equipment. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an electromagnetic flowmeter that can overcome or at least partially solve the above problems.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: an electromagnetic flowmeter, including a test tube, and further including: coil one and coil two, symmetrically arranged on the test tube; two electrode assemblies, symmetrically arranged on the test tube, the two electrode assemblies being perpendicular to coil one and coil two; an inner liner assembly sleeved in the test tube, the inner liner assembly including detachably connected inner liner one and inner liner two, one end of each inner liner one and inner liner two being provided with a flange; and a monitoring assembly for monitoring the wear condition of the inner wall of the inner liner assembly.

[0007] Preferably, two fixing rings are installed on the test tube, and an installation area is formed between the two fixing rings. The coil one, coil two, and electrode assembly are all installed in the installation area.

[0008] Preferably, screws are symmetrically fixedly connected to the test tube, and patches are sleeved on both screws. Coil 1 and Coil 2 are respectively sleeved on the two screws through two coil pressure plates, and connected to the test tube through nuts 2 threaded on the screws. The two patches are respectively located in Coil 1 and Coil 2.

[0009] Preferably, the electrode assembly includes an electrode rod and an electrical signal wire terminal connected to the electrode rod. The test tube has symmetrically opened mounting holes. One end of the electrode rod passes through the mounting hole into the test tube. A sealing gasket and a washer are fitted on the electrode rod. The electrode rod is locked to the test tube by a nut.

[0010] Furthermore, the inner lining assembly has a spiral guide groove.

[0011] Preferably, there are two spiral guide grooves with the same spiral direction, the starting angle of the two spiral guide grooves is 180 degrees, the two spiral guide grooves pass through two electrode rods respectively, and the spiral guide grooves located at the electrode rods are provided with rinsing guide grooves.

[0012] Preferably, there are two spiral guide grooves with opposite spiral directions, and the included angle between the starting angles of the two spiral guide grooves is 180 degrees.

[0013] Furthermore, the monitoring component includes a groove formed on the test tube, an indicator rod fixedly connected to the outer periphery of the inner liner, the indicator rod being located in the groove, a scale being formed on the outer periphery of the test tube located at the groove, a transparent protective cover being provided on the test tube located at the indicator rod, and a humidity sensor being installed on the transparent protective cover for monitoring the humidity inside the transparent protective cover.

[0014] Furthermore, it also includes an external connecting pipe connected to flange two at one end of the test tube. One end of the external connecting pipe has an annular groove, and the flange of the inner liner two is located in the annular groove. Four pressure sensors are installed circumferentially in the annular groove.

[0015] A method for monitoring wear of the lining components of an electromagnetic flowmeter includes the following steps:

[0016] S1. Set the initial threshold of the pressure sensor to the detection reference value when the liner assembly is not worn;

[0017] S2. When the detection values ​​of at least two of the pressure sensors are greater than 15% of the initial threshold, a level one warning for slight wear is determined;

[0018] S3. When the detection values ​​of at least two pressure sensors are greater than 30% of the initial threshold, it is determined to be a level 2 warning for moderate wear;

[0019] S4. When the detection values ​​of at least two pressure sensors are greater than 50% of the initial threshold, a level three warning for severe wear is issued.

[0020] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] 1. This electromagnetic flowmeter, by setting the inner lining components as inner lining one and inner lining two and connecting them in a detachable manner, enables quick replacement, effectively improving maintenance efficiency;

[0022] 2. This electromagnetic flowmeter uses an indicator rod and scale to visualize wear. Combined with a transparent protective cover and a humidity sensor, it can not only visually determine the displacement of the inner lining through manual inspection, but also provide early warning of damage and leakage of the inner lining components through a sudden increase in humidity.

[0023] 3. This electromagnetic flowmeter achieves automated wear detection of the inner lining components by setting a three-level early warning system based on the pressure sensor. The output signal can be directly connected to the industrial control system to achieve early warning and avoid sudden shutdown.

[0024] 4. This electromagnetic flowmeter, through its designed unidirectional double helical guide grooves, can reduce local eddies, optimize fluid flow patterns, and make the flow velocity distribution more uniform, effectively improving measurement accuracy. Meanwhile, the reverse double helical guide grooves balance circumferential pressure through counter-rotating rotation, making it suitable for high-viscosity media containing particles. It can reduce local wear of the inner lining components caused by unidirectional scouring, effectively extending its service life. At the same time, the helical guide grooves can also achieve automatic cleaning of the electrode rod tip, reducing maintenance requirements.

[0025] Therefore, this device, through its coordinated design of rapid replacement, accurate early warning, and flow optimization, takes into account measurement accuracy, ease of maintenance, and adaptability to operating conditions. It solves the problems of difficult replacement of the inner lining, difficulty in monitoring wear, and susceptibility to flow interference in traditional electromagnetic flowmeters, and can be widely used in the field of industrial fluid measurement.

[0026] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0027] In the attached diagram:

[0028] Figure 1 This is a three-dimensional structural schematic diagram of an electromagnetic flowmeter proposed in this invention;

[0029] Figure 2 This is a schematic diagram of flange one and flange two of an electromagnetic flowmeter proposed in this invention;

[0030] Figure 3 This is a schematic diagram of the screw and mounting hole of an electromagnetic flowmeter proposed in this invention;

[0031] Figure 4 This is a schematic diagram of the coil pressure plate and electrode assembly of an electromagnetic flowmeter proposed in this invention;

[0032] Figure 5 This is a schematic diagram of the structure of a patch for an electromagnetic flowmeter proposed in this invention;

[0033] Figure 6 This is a schematic diagram of the structure of the electrode rod of an electromagnetic flowmeter proposed in this invention;

[0034] Figure 7 This is a schematic diagram of the annular groove and pressure sensor of an electromagnetic flowmeter proposed in this invention;

[0035] Figure 8 This is a schematic diagram of the structure of the inner liner 1 and inner liner 2 of an electromagnetic flowmeter proposed in this invention;

[0036] Figure 9 This is a schematic diagram of two spiral guide grooves running in the same direction;

[0037] Figure 10 This is a schematic diagram of two opposing spiral guide grooves;

[0038] Figure 11 This is a schematic diagram of the structure of a transparent protective cover for an electromagnetic flowmeter proposed in this invention;

[0039] Figure 12 This is a schematic diagram of the structure of a humidity sensor for an electromagnetic flowmeter proposed in this invention;

[0040] Figure 13 This invention proposes an electromagnetic flowmeter. Figure 12 Enlarged view of point A in the middle.

[0041] In the diagram: 1. Test tube; 10. Electrode assembly; 100. Housing; 101. Electrode rod; 102. Sealing gasket; 103. Electrical signal wire terminal; 104. Nut 1; 11. Flange 1; 12. Flange 2; 13. Retaining ring; 14. Mounting area; 15. Screw; 16. Mounting hole; 17. Coil 1; 171. Coil pressure plate; 172. Nut 2; 18. Coil 2; 19. Patch; 2. Liner 1; 21. Liner 2; 22. Front insertion section; 23. Groove section; 3. Spiral guide groove; 31. Flushing guide groove; 4. External connecting pipe; 41. Annular groove; 42. Pressure sensor; 5. Slide groove; 51. Indicator rod; 52. Scale; 53. Transparent protective cover; 54. Humidity sensor. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] The following is in conjunction with the appendix Figure 1 - Appendix Figure 13 The technical solutions provided in the various embodiments of the present invention will be described in detail.

[0044] Example: Refer to Figures 1-7 An electromagnetic flowmeter includes a test tube 1 with flange 11 and flange 12 at both ends, and further includes: coil 17 and coil 28 symmetrically arranged on the test tube 1; two electrode assemblies 10 symmetrically arranged on the test tube 1, the two electrode assemblies 10 being perpendicular to coil 17 and coil 28; an inner lining assembly sleeved in the test tube 1, the inner lining assembly including detachably connected inner lining 2 and inner lining 21, one end of each inner lining 2 and inner lining 21 being provided with a flange 20; and a monitoring assembly for monitoring the wear condition of the inner wall of the inner lining assembly.

[0045] Two fixing rings 13 are installed on the test tube 1, and an installation area 14 is formed between the two fixing rings 13. Coil 1 17, coil 2 18 and electrode assembly 10 are all installed in the installation area 14.

[0046] The test tube 1 is symmetrically fixed with screws 15, and each screw 15 is fitted with a patch 19. Coil 17 and coil 2 18 are respectively fitted onto the two screws 15 through two coil pressure plates 171, and are connected to the test tube 1 through nuts 2 172 threaded onto the screws 15. The two patches 19 are located in coil 17 and coil 2 18 respectively. The patches 19 are made of permalloy material with high magnetic permeability to enhance the uniformity of the magnetic field. At the same time, the patches 19 are used to position coil 17 and coil 2 18. A shell 100 is set between the two fixing rings 13. The shell 100 forms a ring to protect coil 17 and coil 2 18.

[0047] The electrode assembly 10 includes an electrode rod 101 and an electrical signal wire terminal 103 connected to the electrode rod 101. The test tube 1 has symmetrically opened mounting holes 16. One end of the electrode rod 101 passes through the mounting hole 16 and enters the test tube 1. A sealing gasket 102 and a gasket are fitted on the electrode rod 101. The electrode rod 101 is locked to the test tube 1 by a nut 104.

[0048] When this device is in use, when a fluid with a certain conductivity flows through a magnetic field perpendicular to the flow direction, the charged particles in the fluid cut the magnetic field lines and generate an induced electromotive force. The magnitude of the induced electromotive force is proportional to the average flow velocity of the fluid, the magnetic field strength, and the inner diameter of the test tube 1. By measuring the induced electromotive force and combining it with the known magnetic field strength and tube diameter, the fluid velocity can be calculated, and thus the flow rate can be obtained.

[0049] In existing technologies, the inner liner is difficult to disassemble and cannot be quickly replaced due to the tight fit between the flange 20 and the inner wall of the test tube 1 after being eroded and worn by fluid. Therefore, this device sets a front insertion section 22 and a groove section 23 at one end of the inner liner 1 2 and the inner liner 21 respectively, and inserts the inner liner 1 2 into the inner liner 21 to achieve an interference fit connection. When the inner liner assembly is worn, the inner liner 1 2 and the inner liner 21 are pulled out from both ends of the test tube 1 respectively, and the new inner liner assembly is inserted and the test tube 1 is reset. There is no need to disassemble the electrode assembly 10, coil 1 17, and coil 2 18, which realizes quick disassembly and quick replacement, effectively improving maintenance efficiency and reducing downtime.

[0050] Secondly, an external thread can be provided on the outer circumference of one end of the inner liner 2, and an internal thread can be provided on the inner diameter of one end of the inner liner 21 to achieve threaded connection, which can also achieve the effect of quick disassembly and quick replacement.

[0051] Furthermore, since the inner liner assembly is installed in the test tube 1, and the test tube 1 is made of a non-transparent material, it is difficult to know whether the inner liner assembly is worn. When the inner liner assembly is worn, the fluid will become turbulent when passing through the inner liner assembly. The eddies generated in the worn area and the uneven distribution of flow velocity will cause fluctuations in the induced electromotive force collected by the electrode assembly 10, introducing additional errors. Therefore, this device can monitor the wear condition of the inner liner assembly by adding a monitoring component, so as to determine when the inner liner assembly needs to be replaced.

[0052] In some implementations, refer to Figure 11 , Figure 12 , Figure 13 The monitoring component includes a groove 5 on the test tube 1, and an indicator rod 51 fixedly connected to the inner liner 21 (it should be understood that the indicator rod 51 is a rubber or silicone flexible rod, and the indicator rod 51 is short in length, which can be located in the groove 5 (the indicator rod 51 does not contact the side wall of the groove 5), and will not hinder the staff from seeing the position between the indicator rod 51 and the scale 52. The selection of the material and length of the indicator rod 51 is to facilitate the inner liner 21 to be put into or pulled out of the test tube 1). The indicator rod 51 is located in the groove 5, and the scale 52 is opened on the outer periphery of the test tube 1 located at the groove 5. A transparent protective cover 53 is provided on the test tube 1 located at the indicator rod 51.

[0053] Liner 1 2 is located near the fluid inlet end of test tube 1, that is, near flange 11, while liner 2 21 is located at the fluid outlet end of test tube 1, that is, at flange 2 12. The length of test tube 1 is L, the length of liner 1 2 is L1, and the length of liner 2 21 is L2, where L = L1 + L2 and L2 = 0.8L. The purpose of the length design is to ensure that liner 2 21 covers the core area of ​​fluid flow in test tube 1, while liner 1 2 serves as the transition area of ​​the fluid inlet section.

[0054] When the inner liner 21 wears down, its surface becomes rough, which increases the friction between the fluid and the inner liner 21. The increased friction will increase the axial force exerted by the fluid on the inner liner 21, pushing the inner liner 21 forward. The forward displacement of the inner liner 21 (that is, moving forward in the direction of fluid flow) will drive the indicator rod 51 to move in the slide 5, thereby changing its position relative to the initial scale 52. Through regular manual inspection, the wear condition of the inner liner 21 can be detected.

[0055] The transparent protective cover 53 is designed to prevent foreign objects from covering or blocking the indicator rod 51 and the slide 5, which would prevent the indicator rod 51 from moving when subjected to the axial force of the inner liner 21. It also prevents external liquid from entering between the inner liner assembly and the test tube 1 from the slide 5.

[0056] In some implementations, refer toFigure 13 A humidity sensor 54 is installed on the transparent protective cover 53 to monitor the humidity inside the transparent protective cover 53, and to determine whether the reason for the shutdown of this device is that the inner liner component is damaged and fluid seeps into the space between the inner liner component and the test tube 1, causing the inner liner component to lose its insulation function, thus causing the device to fail to work properly.

[0057] When the inner liner 21 shifts, the gap between the inner liner 21 and the inner liner 2 increases, and the fluid in the inner liner assembly seeps into the space between the inner liner assembly and the test tube 1, and flows into the transparent protective cover 53 through the chute 5. By setting a humidity sensor 54 or a liquid sensor, effective monitoring can be performed to further determine the wear condition of the inner liner assembly and whether the failure of this device is due to damage to the inner liner assembly, thereby enabling faster inspection and screening. In this embodiment, since the amount of seepage varies, in order to better monitor the change in the gap between the inner liner 2 and the inner liner 21, a humidity sensor 54 is preferred, which can more quickly monitor the seepage of fluid.

[0058] In some implementations, refer to Figure 7 It also includes an external connecting pipe 4, one end of which is provided with an annular groove 41, the flange 20 of the inner liner 21 is located in the annular groove 41, and four pressure sensors 42 are installed circumferentially in the annular groove 41.

[0059] The principle of pressure sensor 42 detecting liner assembly wear: When the liner assembly wears, its surface becomes rough, leading to increased friction between the fluid and the liner assembly. This increased friction increases the axial force exerted by the fluid on liner 21, pushing it forward. Once liner 21 moves forward, it compresses pressure sensor 42, increasing the pressure value detected by sensor 42. As wear intensifies and liner 21 continues to move forward, the gap between liner 2 and liner 21 continuously widens. The integrity of the spiral guide groove 3, originally used to optimize flow, is compromised, further increasing the impact force of the fluid on liner 21, and causing the pressure sensor 42 value to rise continuously. By monitoring the changes in the pressure sensor 42 value, it is determined whether the liner assembly has worn.

[0060] In some implementations, the design of the indicator rod 51 and the design of the pressure sensor 42 can be used simultaneously to achieve a dual monitoring mechanism to ensure reliability.

[0061] A method for monitoring wear of the lining components of an electromagnetic flowmeter includes the following steps:

[0062] S1. Set the initial threshold of the pressure sensor 42 to the detection reference value when the liner assembly is not worn;

[0063] S2. When the detection values ​​of at least two pressure sensors 42 are greater than 15% of the initial threshold, a level one warning for slight wear is issued;

[0064] S3. When the detection values ​​of at least two pressure sensors 42 are greater than 30% of the initial threshold, it is determined to be a level 2 warning for moderate wear;

[0065] S4. When the detection values ​​of at least two pressure sensors 42 are greater than 50% of the initial threshold, a level three warning for severe wear is issued.

[0066] When the wear of the inner liner 21 causes an increase in friction between the fluid and the inner liner 21, the inner liner 21 moves forward, and the flange 20 applies force to the pressure sensor 42, triggering a level 3 warning measure.

[0067] The trigger formula for Level 3 warning is as follows:

[0068] The inner lining component uses insulating material, typically rubber. Based on the properties of rubber, the following formula is derived:

[0069] Formula 1: Relationship between frictional resistance and wear of lining 21:

[0070] The formula for the friction resistance coefficient is: ,in This represents the current frictional resistance coefficient. This is the initial frictional resistance coefficient (approximately 0.5-1.0 for rubber). This is the relative roughness change rate (the ratio of the increase in surface roughness due to wear to the initial value). The elastic deformation rate of the inner lining is 21, representing the degree of deformation caused by fluid pressure; for rubber, this ranges from 0.02 to 0.05. , For the material coefficient, rubber: =1.2, =0.6.

[0071] Formula 2: The formula relating fluid force to the displacement of lining 21. Since the rubber lining 21 is affected not only by friction but also by its own elastic deformation, the formula is as follows:

[0072]

[0073] in, The actual displacement (mm) of lining 21; The total axial force (N) exerted by the fluid on the inner lining 21. For structural constants, For flow rate; The elastic modulus of the inner lining component material is approximately 50-100 N / mm for rubber. The elastic compression of the lining component due to pressure (mm). The resistance coefficient for the connection between lining 12 and lining 21 is 120-150 N / mm, given the high friction of the rubber.

[0074] Formula 3: Conversion formula between displacement and pressure sensor 42:

[0075]

[0076] in, The measured value (N) is from pressure sensor 42. The force-to-electric conversion coefficient of the pressure sensor 42 is typically 5-20 N / V; The elastic deformation (mm) of the inner liner 21 when it comes into contact with the pressure sensor 42 is approximately 0.3-0.5 mm.

[0077] Formula 4: Dynamic Compensation Formula (used to eliminate flow velocity interference):

[0078]

[0079] in, The actual pressure value after compensation; The original measurement value of pressure sensor 42; This is the flow velocity compensation coefficient, a value calibrated experimentally, approximately 0.01-0.03. .

[0080] The value of pressure sensor 42 can be calculated using the above formula, and the corresponding first, second, and third level warnings can be matched.

[0081] In some embodiments, a spiral guide groove 3 is provided in the liner assembly. By providing a spiral guide groove 3 on the inner wall of the inner liner 21 of the liner assembly, and the number of spiral guide grooves 3 is one, the flow velocity distribution of the fluid passing through the test tube 1 can be optimized, and the straight pipe section requirement can be reduced (reducing the straight pipe section requirement means that by optimizing the structure of the inner wall of the inner liner 21, the dependence on the straight length of the pipes before and after the test tube 1 can be reduced, so that the measurement accuracy can still be guaranteed in scenarios where the pipe layout is limited, such as in narrow spaces, or where there are bends or valves).

[0082] In some embodiments, refer to Figure 7 , Figure 8 , Figure 9 Two spiral guide grooves 3 are provided with the same spiral direction. The angle between the starting angles of the two spiral guide grooves 3 is 180 degrees. The two spiral guide grooves 3 pass through two electrode rods 101 respectively. The spiral guide grooves 3 located at the electrode rods 101 are provided with rinsing guide grooves 31.

[0083] Setting the spiral guide grooves 3 as two in the same direction will superimpose the rotation trend of the fluid, making the fluid form a stronger axial spiral flow in the test tube 1, such as double spiral propulsion, so that the flow velocity distribution is more concentrated in the center of the test tube 1 and the flow velocity at the edge is reduced. The design of the double spiral guide grooves 3 can make the fluid flow in an orderly manner along the spiral guide grooves 3, reducing the local eddies caused by sudden changes in flow velocity.

[0084] Furthermore, the design of the two spiral guide grooves 3 can make the pressure gradient more uniform, and the centrifugal force of the spiral flow makes the circumferential pressure of the test tube 1 more symmetrical, reducing the forced vibration on the surface of the inner liner component, reducing local stress concentration, and thus reducing the risk of cracking of the inner liner component.

[0085] Furthermore, since the electrode rod 101 is in contact with the fluid for a long time, suspended matter, sediment, viscous substances or corrosive materials in the fluid can easily adhere to the front end of the electrode rod 101. This will prevent the front end of the electrode rod 101 from directly contacting the fluid, making it impossible to effectively conduct the induced electromotive force, resulting in signal attenuation or distortion. Traditional solutions require periodic shutdowns for disassembly and cleaning, which is costly. Therefore, this device places the front end of the electrode rod 101 in the spiral guide groove 3. When the fluid is spiral in the inner liner assembly, it can clean the front end of the electrode rod 101, effectively reducing measurement errors and minimizing manual maintenance.

[0086] Furthermore, referring to Figure 4 , Figure 5 The front end of the electrode rod 101 is a hemispherical protrusion, which can guide the fluid to form local turbulence when the fluid passes through, thereby enhancing the shearing force on the attached foreign matter.

[0087] Therefore, the spiral guide groove 3 can not only optimize the fluid velocity distribution, but also automatically clean the front end of the electrode rod 101.

[0088] In some embodiments, refer to Figure 10 Two spiral guide grooves 3 are provided with opposite spiral directions, and the included angle between the starting angles of the two spiral guide grooves 3 is 180 degrees.

[0089] The rotational forces generated by the two counter-designed spiral guide grooves 3 neutralize each other in the central region of the liner assembly, reducing the overall rotation of the fluid and ultimately forming a low-rotation axial flow. The flow velocity distribution is closer to the laminar flow state. At the same time, local turbulence is generated at the intersection of the counter-designed spiral guide grooves 3, which can promote the uniform diffusion of the fluid in the radial direction, reduce the radial pressure on the liner assembly, make the radial pressure on the inner wall of the liner assembly more uniform, and reduce the deformation of the liner assembly material.

[0090] Furthermore, the front ends of the two electrode rods 101 are also located in two reverse spiral guide grooves 3, thereby enabling automatic cleaning of the front ends of the electrode rods 101.

[0091] In some embodiments, the spiral guide groove 3 is continuously formed on the inner liner 1 2 and the inner liner 21, which makes the fluid more continuous when entering the inner liner assembly and the flow distribution more uniform.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An electromagnetic flowmeter, comprising a test tube (1), characterized in that, Also includes: Coil 1 (17) and Coil 2 (18) are symmetrically arranged on the test tube (1); Two electrode assemblies (10) are symmetrically arranged on the test tube (1), and the two electrode assemblies (10) are perpendicular to coil one (17) and coil two (18); The inner liner assembly fitted in the test tube (1) includes a detachably connected inner liner one (2) and inner liner two (21), and one end of the inner liner one (2) and inner liner two (21) is provided with a flange (20). A monitoring component for monitoring the wear condition of the inner wall of the liner assembly; The monitoring component includes a groove (5) opened on the test tube (1), an indicator rod (51) is fixedly connected to the inner liner (21), the indicator rod (51) is located in the groove (5), a scale (52) is opened on the outer periphery of the test tube (1) located at the groove (5), and a transparent protective cover (53) is provided on the test tube (1) located at the indicator rod (51). Alternatively, the monitoring component may include a humidity sensor (54) disposed within the transparent protective cover (53) for monitoring the humidity within the transparent protective cover (53); Alternatively, the monitoring component may include an external connecting pipe (4), one end of which is provided with an annular groove (41), the flange (20) of the inner liner (21) is located in the annular groove (41), and four pressure sensors (42) are circumferentially installed in the annular groove (41).

2. The electromagnetic flowmeter according to claim 1, characterized in that, Two fixing rings (13) are installed on the test tube (1), and an installation area (14) is formed between the two fixing rings (13). The coil one (17), the coil two (18), and the electrode assembly (10) are all installed in the installation area (14).

3. An electromagnetic flowmeter according to claim 2, characterized in that, The test tube (1) is symmetrically fixed with screws (15), and each of the two screws (15) is fitted with a patch (19). The first coil (17) and the second coil (18) are respectively fitted on the two screws (15) through two coil pressure plates (171), and are connected to the test tube (1) through the second nut (172) threaded on the screws (15). The two patches (19) are located in the first coil (17) and the second coil (18) respectively.

4. An electromagnetic flowmeter according to claim 3, characterized in that, The electrode assembly (10) includes an electrode rod (101) and an electrical signal wire terminal (103) connected to the electrode rod (101). The test tube (1) has symmetrically opened mounting holes (16). One end of the electrode rod (101) passes through the mounting hole (16) into the test tube (1). The electrode rod (101) is fitted with a sealing gasket (102) and a gasket. The electrode rod (101) is locked to the test tube (1) by a nut (104).

5. An electromagnetic flowmeter according to claim 4, characterized in that, The inner lining assembly has a spiral guide groove (3).

6. An electromagnetic flowmeter according to claim 5, characterized in that, The spiral guide groove (3) is provided in two directions with the same spiral direction. The angle between the starting angles of the two spiral guide grooves (3) is 180 degrees. The two spiral guide grooves (3) pass through two electrode rods (101) respectively. The spiral guide groove (3) located at the electrode rod (101) is provided with a rinsing guide groove (31).

7. An electromagnetic flowmeter according to claim 5, characterized in that, The spiral guide groove (3) is provided in two directions with opposite spiral directions, and the angle between the starting angles of the two spiral guide grooves (3) is 180 degrees.

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