An anti-blocking intelligent electromagnetic flowmeter

Abstract

The present invention belongs to the technical field of electromagnetic flowmeters. More specifically, it particularly aims at an anti-blocking intelligent electromagnetic flowmeter. It includes a converter arranged on the upper side of the housing, and a first lining and a second lining arranged inside the housing. A sensor is installed on the first lining, and a flow guiding ring is rotatably connected to the first lining; the flow guiding ring is provided with a flow guiding surface, and the flow guiding ring is provided with a plurality of first filtering holes. The present invention guides solid particles to the axis of the first lining through the flow guiding surface, so that the solid particles in the two-phase flow are far away from the inner wall of the first lining. During long-term use, the probability that the inner wall of the first lining near the sensor is scratched by the solid particles in the two-phase flow is reduced, so as to ensure the smoothness of the inner wall surface of the first lining near the sensor, thereby reducing the probability of solid particles adhering and accumulating near the sensor in the first lining and even causing blockage, so as to ensure the accuracy of the sensor for monitoring the two-phase flow.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic flowmeters, and more specifically, particularly aims at an anti-blocking intelligent electromagnetic flowmeter. Background Art

[0002] As a flow measurement device based on Faraday's law of electromagnetic induction, electromagnetic flowmeters are widely used in the flow velocity monitoring of conductive media. In industrial scenarios such as oil exploration, geological drilling, and mining transportation, electromagnetic flowmeters often need to monitor the flow rate of solid-liquid two-phase flows (such as mud and pulp containing solid particles) in high-pressure pipelines.

[0003] An electromagnetic flowmeter consists of structures such as a housing, a lining, and a sensor. Based on Faraday's law of electromagnetic induction, its principle is as follows: magnetic lines of force are generated by the sensor. When the solid-liquid two-phase flow flows in the lining, it cuts the magnetic lines of force. When the solid-liquid two-phase flow cuts the magnetic lines of force in the magnetic field, an induced electromotive force will be generated in the solid-liquid two-phase flow. The magnitude of the electromotive force is proportional to the magnetic field strength, the inner diameter of the pipeline through which the solid-liquid two-phase flow flows, and the flow velocity.

[0004] However, the solid-liquid two-phase flow contains a large number of solid particles. The solid particles flow rapidly in the high-pressure pipeline and are prone to intense friction with the inner wall of the lining of the electromagnetic flowmeter, resulting in wear of the lining (especially in the area close to the sensor), a decrease in surface finish. The rough inner wall after wear will exacerbate the adhesion of solid particles. Long-term accumulation is likely to cause local accumulation and even blockage in the lining, which will cause a change in the inner diameter of the pipeline through which the solid-liquid two-phase flow flows at the monitored location, thereby affecting the accuracy of the sensor's monitoring of the solid-liquid two-phase flow. Summary of the Invention

[0005] In order to overcome the above-mentioned drawbacks in the background, the present invention provides an anti-blocking intelligent electromagnetic flowmeter.

[0006] The technical solution of the present invention is: an anti-blocking intelligent electromagnetic flowmeter, including a converter arranged on the upper side of the housing, and a first lining and a second lining arranged in the housing. A sensor is installed on the first lining, and the sensor is located inside the housing. It is characterized in that a flow guiding ring is hermetically and rotatably connected between the first lining and the second lining;

[0007] A flow guiding surface is arranged at a position of the flow guiding ring far from the sensor. The flow guiding surface gradually approaches the axis of the first lining from a position far from the sensor to a position close to it. One side of the flow guiding ring close to the sensor is a vertical surface, and the flow guiding ring is provided with a plurality of first filtering holes.

[0008] Preferably, a motor is installed inside the outer shell. The output shaft of the motor is driven by a gear set to the flow guide ring. A cleaning plate is fixedly connected inside the second lining. The cleaning plate is attached to the flow guide surface. When the flow guide ring rotates, the cleaning plate is used to scrape the solids attached to the flow guide surface.

[0009] Preferably, the first filter hole is a spiral through hole.

[0010] Preferably, a pressure ring is connected in a limited sliding manner inside the first lining. The pressure ring is provided with a plurality of second filter holes. Two limiting parts are symmetrically distributed inside the outer shell. The pressure ring is located between the two limiting parts. The limiting parts are used to block the pressure ring to limit the position of the pressure ring. Both of the two limiting parts are located between the flow guide ring and the sensor. A trigger plate is fixedly connected to the flow guide ring. A trigger block is fixedly connected to the pressure ring. The trigger plate is used to squeeze the trigger block so that the trigger block moves and rotates.

[0011] Preferably, the contact surfaces between the pressure ring and the limiting parts are all friction surfaces. The rotational resistance of the pressure ring is greater than its horizontal sliding resistance.

[0012] Preferably, the cleaning plate is located at a position close to the lower part of the flow guide surface, and the cleaning plate is attached to the lower part of the flow guide surface.

[0013] Preferably, the cleaning plate is provided with two guiding surfaces that are symmetrically distributed. The highest point of the guiding surface does not exceed the axis of the flow guide ring. The distance between the two guiding surfaces gradually shortens from bottom to top.

[0014] Preferably, the pressure ring is provided with a notch.

[0015] Preferably, the outer diameter of the pressure ring gradually increases from the position close to the flow guide ring to the position far away from it.

[0016] Preferably, the aperture of the second filter hole is smaller than the aperture of the first filter hole.

[0017] The present invention has at least the following advantages compared with the existing similar technologies: 1. The present invention guides the solid particles to the axis of the first lining through the flow guide surface, so that the solid particles in the two-phase flow are away from the inner wall of the first lining. During long-term use, the probability of the inner wall of the first lining near the sensor being scratched by the solid particles in the two-phase flow is reduced, so as to ensure the smoothness of the inner wall surface of the first lining near the sensor, thereby reducing the probability of solid particles adhering and accumulating near the sensor in the first lining and even causing blockage, so as to ensure the accuracy of the sensor for monitoring the two-phase flow;

[0018] 2. When the diversion ring rotates, the cleaning plate scrapes off the solid particles adhering to the diversion surface, and makes the solid particles accumulated on the lower side of the diversion surface move upward along the guiding surface, so as to reduce the probability of blockage of the first filtering holes caused by impurity accumulation on the lower side of the diversion ring. The diversion ring rotates and drives the pressure ring to rotate through the trigger plate and the trigger block. The pressure ring rotates and scrapes off the solid particles accumulated between the two limiting parts, so as to reduce the probability of impurity accumulation between the diversion ring and the trigger plate. When the diversion ring rotates in reverse, the diversion ring drives the pressure ring to move through the trigger plate and the trigger block. The pressure ring moves and squeezes the liquid, so that the liquid is pressed and squeezed into the first filtering holes to perform backwashing on the first filtering holes, so as to reduce the probability of blockage of the first filtering holes;

[0019] 3. By setting the change of the outer diameter of the pressure ring, the backwashing force on the first filtering holes near the first lining is increased, that is, the closer to the inner wall of the first lining, the longer the first filtering holes at this place, so as to adapt to the flushing forces required by different first filtering holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 is a three-dimensional structural sectional view of the outer shell and the exciting member of the present invention;

[0022] Figure 3 is a three-dimensional structural explosion diagram of the outer shell, the first lining and the second lining of the present invention;

[0023] Figure 4 is a three-dimensional structural schematic diagram of the diversion ring of the present invention;

[0024] Figure 5 is a three-dimensional structural sectional view of the diversion ring of the present invention;

[0025] Figure 6 is a three-dimensional structural schematic diagram of the trigger plate and the trigger block of the present invention.

[0026] In the figure, the markings are: 1 - outer shell, 101 - partition plate, 2 - converter, 3 - first lining, 4 - second lining, 5 - sensor, 501 - exciting member, 502 - coil, 503 - electrode, 6 - diversion ring, 601 - diversion surface, 602 - first filtering holes, 7 - motor, 8 - cleaning plate, 801 - guiding surface, 9 - pressure ring, 901 - second filtering holes, 902 - limiting parts, 10 - trigger plate, 11 - trigger block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described below with reference to the embodiments shown in the drawings.

[0028] Embodiment 1

[0029] This embodiment discloses an anti-blocking intelligent electromagnetic flowmeter, which is used to monitor the flow velocity of solid-liquid two-phase flow in a high-pressure pipeline, such as monitoring the flow velocity of the slurry injected under high pressure during geological drilling. On this basis, it has the function of guiding the solid particles in the solid-liquid two-phase flow to reduce the friction of the solid particles against the inner wall of the lining.

[0030] As Figures 1 - 6 shown, it includes a converter 2 arranged on the upper side of the outer shell 1. There is a control module (not shown in the figure) outside the outer shell 1. The converter 2 is electrically connected to the control module. The flow direction of the solid-liquid two-phase flow is marked on the outer shell 1, that is, flowing from left to right. And there are a first lining 3 and a second lining 4 arranged inside the outer shell 1. Both the first lining 3 and the second lining 4 are wear-resistant materials, such as ceramic lining or rubber lining. A sensor 5 electrically connected to the control module is installed on the first lining 3. The converter 2 is used to receive the weak induced electromotive force signal (usually in millivolts) monitored by the sensor 5. Then the converter 2 amplifies the electrical signal and converts it into a standardized output signal, and outputs it to the external control system. The sensor 5 is located inside the outer shell 1. It is characterized in that a guide ring 6 is hermetically and rotatably connected between the first lining 3 and the second lining 4; a guide surface 601 is arranged on the left side inside the guide ring 6. The guide surface 601 gradually approaches the axis of the first lining 3 from left to right. The right side of the guide ring 6 is a vertical surface. The guide ring 6 is provided with a number of first filter holes 602. When the solid-liquid two-phase flow (hereinafter referred to as two-phase flow for short) flows through the guide surface 601 from left to right, through the shape of the guide surface 601, the solids and a part of the liquid in the two-phase flow are guided to a position close to the axis of the first lining 3. The other part of the liquid in the two-phase flow flows to the right through all the first filter holes 602, so that the solid particles in the two-phase flow are temporarily away from the inner walls of the first lining 3 and the second lining 4, so as to reduce the probability of wear at the position on the inner wall of the first lining 3 close to the sensor 5.

[0031] The specific structures and connection relationships of each component are as follows:

[0032] 1. Outer shell 1

[0033] As Figures 1 - 3 shown, the left and right parts of the outer shell 1 are flange mounting seats for docking with the high-pressure pipeline. The high-pressure pipeline in this embodiment and the following embodiments refers to the pipeline through which the two-phase flow flows.

[0034] 2. Sensor 5

[0035] As Figure 2As shown in the figure, the sensor 5 is composed of an exciting member 501, a coil 502, and an electrode 503. The exciting member 501 is installed between the outer shell 1 and the first lining 3. Coils 502 are arranged on both the upper and lower sides of the exciting member 501, and electrodes 503 are arranged on both the front and rear sides of the exciting member 501, so that a magnetic field can be formed at the position in the first lining 3 covered by the sensor 5. Based on Faraday's law of electromagnetic induction, an induced electromotive force will be generated when the two-phase flow moves in the magnetic field, and thus the flow rate of the two-phase flow can be measured.

[0036] In this embodiment, the process of monitoring the flow rate of the two-phase flow is as follows:

[0037] Preparation for use:

[0038] The outer shell 1 is installed between two sections of high-pressure pipelines through two flange mounting seats of the outer shell 1, and the second lining 4 and the first lining 3 are respectively communicated with the left and right sections of high-pressure pipelines. After ensuring the effective sealing of the installation locations of the high-pressure pipelines, the outer shell 1, the first lining 3, and the second lining 4, the converter 2 and the sensor 5 are turned on through the control module.

[0039] During use:

[0040] The two-phase flow in the high-pressure pipeline flows from left to right to the second lining 4, and then the two-phase flow contacts the diversion ring 6. Affected by the diversion surface 601 and all the first filter holes 602, the solid particles in the two-phase flow are carried by a part of the liquid and move along the diversion surface 601, and another part of the liquid in the two-phase flow flows through the first filter holes 602, so that when the solid particles enter the first lining 3, the solid particles flow towards the axis of the first lining 3, so that the solid particles in the two-phase flow are away from the inner wall of the first lining 3. During long-term use, the probability of the inner wall of the first lining 3 near the sensor 5 being scratched by the solid particles in the two-phase flow is reduced, so as to ensure the smoothness of the inner wall surface of the first lining 3 near the sensor 5, thereby reducing the probability of solid particles adhering and accumulating near the sensor 5 in the first lining 3 and even causing blockage, so as to ensure the accuracy of the sensor 5 in monitoring the two-phase flow.

[0041] When the device is no longer needed, the operator turns off the converter 2 and the sensor 5 through the control module. If maintenance and replacement of the device are required, the outer shell 1 is removed for maintenance and replacement.

[0042] Embodiment 2

[0043] This embodiment discloses an anti-blocking intelligent electromagnetic flowmeter, which, on the basis of Embodiment 1, also has the function of reducing the accumulation amount of solid particles at the bottom of the diversion surface 601 and ensuring the flow efficiency of the first filter holes 602.

[0044] As Figures 2 - 4As shown, a motor 7 electrically connected to the control module is installed in the housing 1, and a blocking plate 101 is arranged between the motor 7 and the sensor 5. The blocking plate 101 is located between the housing 1 and the first lining 3. The housing 1 and the first lining 3 are both fitted with the blocking plate 101. The blocking plate 101 is a material that isolates magnetic force, such as conductive rubber. The conductive particles filled in the conductive rubber (such as silver-plated glass, silver-plated aluminum, silver, etc.) generate an electromagnetic field opposite to the external electromagnetic field, thereby effectively offsetting the electromagnetic interference wave to reduce the influence of the sensor 5 on the motor 7. The position of 7 can be disassembled to facilitate the maintenance and replacement of the motor 7. The output shaft of the motor 7 and the guide ring 6 are transmitted through a gear set, wherein the gear set consists of two spur gears, one spur gear is fixedly connected to the guide ring 6, and the other spur gear is fixedly connected to the output shaft of the motor 7. The output shaft of the motor 7 can rotate reciprocatingly to control the counterclockwise and clockwise rotation of the guide ring 6. A cleaning plate 8 is fixedly connected to the second lining 4, and the cleaning plate 8 is in contact with the guide surface 601. When the guide ring 6 rotates, the cleaning plate 8 is used to scrape off the solids attached to the guide surface 601.

[0045] The first filter hole 602 is a spiral through hole. The rotation angles in this embodiment and the following embodiments are all based on Figure 1 Taking the right view as a reference, the rotation direction of the first filter hole 602 is counterclockwise rotation from right to left. When the guide ring 6 rotates counterclockwise, part of the liquid in the two-phase flow enters the first filter hole 602.

[0046] The cleaning plate 8 is located near the lower part of the guide surface 601, and the cleaning plate 8 is in contact with the lower part of the guide surface 601. The cleaning plate 8 is provided with two guide surfaces 801 symmetrically distributed front and back. The highest point of the guide surface 801 does not exceed the axis of the guide ring 6. The distance between the two guide surfaces 801 gradually shortens from bottom to top. During the rotation of the guide ring 6, the guide surface 801 guides the solid particles adhered and accumulated on the lower side of the guide ring 6, so that the solid particles adhered and accumulated on the lower side of the guide surface 601 flow upward along the guide surface 801, so as to reduce the probability of the first filter hole 602 being blocked due to the accumulation of impurities on the lower side of the guide surface 601.

[0047] The working process of this embodiment is similar to that of Embodiment 1, and is described in detail as follows:

[0048] When using this device:

[0049] When it is necessary to clean the diversion ring 6, the motor 7 is turned on through the control module. The output shaft of the motor 7 drives the diversion ring 6 to rotate counterclockwise through the gear set. Since the rotation direction of the first filter hole 602 is counterclockwise from right to left, when the diversion ring 6 rotates counterclockwise, it is convenient for the liquid in the two-phase flow to enter the first filter hole 602. The liquid pressure in the first filter hole 602 increases. And during the counterclockwise rotation of the diversion ring 6, the diversion surface 601 fits against the cleaning plate 8 and rotates. The cleaning plate 8 scrapes the solid particles attached to the diversion surface 601. The solid particles attached to the diversion surface 601 are scraped off, and the solid particles accumulated on the lower side of the diversion surface 601 move upward along the guiding surface 801, so that the solid particles accumulated on the lower side of the diversion surface 601 flow through the diversion ring 6 and to the right, to reduce the probability of blockage of the first filter hole 602 caused by impurity accumulation on the lower side of the diversion ring 6. When the cleaning of the diversion ring 6 is completed, the motor 7 is turned off through the control module.

[0050] Embodiment 3

[0051] This embodiment discloses an anti-blocking intelligent electromagnetic flowmeter, which, on the basis of Embodiment 2, further has the function of dredging the first filter hole 602.

[0052] As Figures 3 - 6 shown, a pressure ring 9 is connected in a limited sliding manner inside the first lining 3. The pressure ring 9 is provided with a plurality of second filter holes 901. Two limiting parts 902 are symmetrically distributed left and right inside the housing 1. The pressure ring 9 is located between the two limiting parts 902. The limiting parts 902 are used to block the pressure ring 9 to limit the position of the pressure ring 9. Both of the two limiting parts 902 are located between the diversion ring 6 and the sensor 5. The diversion ring 6 is fixedly connected with a trigger plate 10, and the pressure ring 9 is fixedly connected with a trigger block 11. The opposite sides of the trigger block 11 and the trigger plate 10 are both provided with inclined surfaces, and the rear side of the trigger block 11 and the front side of the trigger plate 10 are both provided with flat surfaces. The trigger plate 10 is used to squeeze the trigger block 11 to make the trigger block 11 move and rotate. When the diversion ring 6 drives the trigger plate 10 to rotate counterclockwise, the trigger plate 10 squeezes the flat surface of the trigger block 11 through its flat surface, so that the trigger block 11 drives the pressure ring 9 to rotate. When the diversion ring 6 drives the trigger plate 10 to rotate clockwise, the trigger plate 10 squeezes the inclined surface of the trigger block 11 through its inclined surface, so that the trigger block 11 moves to the left and squeezes the two-phase flow on its left side, so that a part of the liquid between the diversion ring 6 and the pressure ring 9 enters the first filter hole 602 from right to left to perform a backwash on the first filter hole 602.

[0053] The contact surfaces between the pressure ring 9 and the limiting parts 902 are all friction surfaces, and the rotational resistance of the pressure ring 9 is greater than its horizontal sliding resistance.

[0054] The pressure ring 9 is provided with a notch to prevent the accumulation of solid particles between the diversion ring 6 and the pressure ring 9 on the lower side. Along with the rotation of the pressure ring 9, the pressure ring 9 scrapes the solid particles accumulated between the two limiting parts 902.

[0055] The closer to the inner wall of the first lining 3, the longer the first filter hole 602. By making the outer diameter of the pressure ring 9 gradually increase from left to right, a sunken space is formed between the left side of the pressure ring 9 and the first lining 3, and the cross-sectional area of this space gradually increases from the place far away from the inner wall of the first lining 3 to the place close to it, so as to increase the backwashing force on the first filter hole 602 near the first lining 3, thereby adapting to the flushing force required by different first filter holes 602.

[0056] The aperture of the second filter hole 901 is smaller than that of the first filter hole 602, so as to increase the pressure generated by the pressure ring 9 moving to the left on the liquid on the right side of the first filter hole 602, and make the liquid better enter the first filter hole 602.

[0057] The working process of this embodiment follows that of Embodiment 2 and is described in detail as follows:

[0058] During the counterclockwise rotation of the diversion ring 6, the diversion ring 6 drives the trigger plate 10 to rotate counterclockwise. When the trigger plate 10 moves to the plane of its plane contacts the plane of the trigger block 11, along with the rotation of the trigger plate 10, the trigger plate 10 drives the pressure ring 9 to rotate through the trigger block 11. The pressure ring 9 rotates and scrapes the solid particles accumulated between the two limiting parts 902. The scraped solid particles flow to the right along the notch of the pressure ring 9, so as to reduce the probability of impurities accumulating between the diversion ring 6 and the trigger plate 10.

[0059] When it is necessary to backwash the first filter hole 602, the operator controls the output shaft of the motor 7 to reverse through the control module. The output shaft of the motor 7 drives the diversion ring 6 to rotate clockwise through the gear set. The diversion ring 6 drives the trigger plate 10 to rotate clockwise. The inclined surface of the trigger plate 10 contacts the inclined surface of the trigger block 11. The trigger plate 10 squeezes the inclined surface of the trigger block 11 through its inclined surface, so that the trigger block 11 moves to the left. The trigger block 11 drives the pressure ring 9 to move to the left. When the trigger plate 10 rotates until it loses contact with the trigger block 11, the two-phase flow flows from left to right and pushes the pressure ring 9 to move to the right to reset. The pressure ring 9 drives the trigger block 11 to move to the right to reset. In this way, during the clockwise rotation of the diversion ring 6, the pressure ring 9 is driven to move left and right reciprocally through the trigger plate 10 and the trigger block 11.

[0060] During the process of the pressure ring 9 moving to the left, the pressure ring 9 squeezes the liquid on its left side, so that the liquid is squeezed into the first filter hole 602 under pressure to backwash the first filter hole 602, so as to reduce the probability of the first filter hole 602 being blocked.

[0061] After the device stops being used, the operator turns off the converter 2, the motor 7 and the sensor 5 through the control module. If maintenance and replacement of the device are required, the housing 1 is removed for maintenance and replacement.

[0062] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. An anti-blocking intelligent electromagnetic flowmeter, comprising a converter (2) arranged on the upper side of a housing (1), and a first lining (3) and a second lining (4) arranged in the housing (1), wherein a sensor (5) is installed on the first lining (3), and the sensor (5) is located in the housing (1), characterized in that, A guide ring (6) is sealingly and rotatably connected between the first lining (3) and the second lining (4); A guide surface (601) is provided at a position of the guide ring (6) away from the sensor (5), and the guide surface (601) gradually approaches the axis of the first lining (3) from the position away from the sensor (5) to the position close to the sensor (5). The side of the guide ring (6) close to the sensor (5) is a vertical surface, and the guide ring (6) is provided with a plurality of first filter holes (602); a pressure ring (9) is limitedly slidably connected inside the first lining (3), and the pressure ring (9) is provided with a plurality of second filter holes (901). The housing (1) is provided with symmetrically distributed two limiting parts (902), the pressure ring (9) is located between the two limiting parts (902), the limiting part (902) is used to block the pressure ring (9) to limit the position of the pressure ring (9), the two limiting parts (902) are both located between the guide ring (6) and the sensor (5), the guide ring (6) is fixedly connected with a trigger plate (10), the pressure ring (9) is fixedly connected with a trigger block (11), and the trigger plate (10) is used to squeeze the trigger block (11) to enable the trigger block (11) to move and rotate; The trigger block (11) and the trigger plate (10) are both provided with inclined surfaces on their opposite sides, and the rear side of the trigger block (11) and the front side of the trigger plate (10) are both provided with flat surfaces; During the counterclockwise rotation of the guide ring (6), the guide ring (6) drives the trigger plate (10) to rotate counterclockwise. When the trigger plate (10) moves until its plane contacts the plane of the trigger block (11), the trigger plate (10) drives the pressure ring (9) to rotate via the trigger block (11) as the trigger plate (10) rotates. During the clockwise rotation of the guide ring (6), the guide ring (6) drives the trigger plate (10) to rotate clockwise. The inclined surface of the trigger plate (10) contacts the inclined surface of the trigger block (11), and the trigger plate (10) presses the inclined surface of the trigger block (11) through its inclined surface, so that the trigger block (11) moves to the left, and the trigger block (11) drives the pressure ring (9) to move to the left. When the trigger plate (10) rotates until it loses contact with the trigger block (11), the two-phase flow flows from left to right and pushes the pressure ring (9) to move to the right and reset, and the pressure ring (9) drives the trigger block (11) to move to the right and reset.

2. The anti-blocking intelligent electromagnetic flowmeter according to claim 1, wherein, A motor (7) is installed in the housing (1), and the output shaft of the motor (7) is driven by the guide ring (6) via a gear set. A cleaning plate (8) is fixedly connected to the second lining (4), and the cleaning plate (8) is in contact with the guide surface (601). When the guide ring (6) rotates, the cleaning plate (8) is used to scrape off solids attached to the guide surface (601).

3. The anti-blocking intelligent electromagnetic flowmeter according to claim 1, characterized in that, The first filtering hole (602) is a spiral through hole.

4. An anti-clogging intelligent electromagnetic flowmeter according to claim 1, characterized in that, The contact surfaces between the pressure ring (9) and the limiting portion (902) are all friction surfaces, and the rotational resistance of the pressure ring (9) is greater than its horizontal sliding resistance.

5. The anti-clogging intelligent electromagnetic flowmeter according to claim 2, wherein, The cleaning plate (8) is located at a position close to the lower part of the guiding surface (601), and the cleaning plate (8) is attached to the lower part of the guiding surface (601).

6. The anti-blocking intelligent electromagnetic flowmeter according to claim 5, wherein The cleaning plate (8) is provided with two guiding surfaces (801) symmetrically distributed, the highest point of the guiding surface (801) does not exceed the axis of the guiding ring (6), and the distance between the two guiding surfaces (801) gradually decreases from bottom to top.

7. An anti-clogging intelligent electromagnetic flowmeter according to claim 1, characterized in that, The pressure ring (9) is provided with a notch.

8. The anti-clogging intelligent electromagnetic flowmeter according to claim 7, wherein, The outer diameter of the pressure ring (9) gradually increases from the position close to the guiding ring (6) to the position far away from it.

9. The anti-blocking intelligent electromagnetic flowmeter according to claim 8, characterized in that, The aperture of the second filter hole (901) is smaller than the aperture of the first filter hole (602).

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