A card-type electromagnetic flowmeter

Abstract

The present invention relates to the technical field of flowmeters, and proposes a snap-on electromagnetic flowmeter, including a main pipe and a pipeline, wherein a scraping structure is provided inside the main pipe, a connecting plate is fixedly connected to one end of the pipeline, an indicating mechanism is provided on the outer surface of the main pipe, and a display meter is fixedly connected to the outer surface of the main pipe; the scraping structure includes a scraping assembly provided inside the main pipe and a sealing assembly provided between the connecting plate and the main pipe; the scraping assembly includes a swivel embedded inside the main pipe, a fan blade is fixedly connected to the inner side of the swivel, one end of the fan blade is fixedly connected to an axial column, and a scraping rod is fixedly connected to the outer surface of the swivel; the sealing assembly includes a No. 1 annular groove opened at both ends of the main pipe. Through the above technical scheme, the problem that when the existing electromagnetic flowmeter is used for the transportation of sewage or liquids with impurities, a small amount of impurities will adhere to the outer surface of the inner wall of the main pipe, and the impurities on the inner wall cannot be cleaned, and the problem of easy blockage in the long run is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of flowmeters, and in particular to a card-connected electromagnetic flowmeter. Background Art

[0002] Electromagnetic flowmeter is a metering instrument that measures the flow in a pipeline by the principle of electromagnetic induction. The electromagnetic induction measurement method can make the measurement result unaffected by changes in fluid density, viscosity, temperature, pressure and conductivity, making the measurement result more accurate.

[0003] After searching, an electromagnetic flowmeter with the authorization announcement number CN116182964B is found. When water leaks at the connection between the electromagnetic flowmeter and the water pipe, the electromagnetic flowmeter collects water through a water collecting shell, and the collected water flows into the interior of the monitoring box through a water inlet component, so that the leaked water reacts with the filler in the monitoring box and generates gas. The generated gas pushes the water inlet component to seal it, and at the same time pushes the moving part in the exhaust pipe, so that the moving part drives the pushing part to move and triggers the warning part, so that the warning part emits an audible and visual alarm, so that the staff can find the water leak in time and repair it in time. When the pushing part moves, it drives the linkage assembly to push the sealing part to move;

[0004] However, when the above-mentioned existing electromagnetic flowmeter is used for conveying sewage or liquid with impurities, a small amount of impurities will adhere to the outer surface of the inner wall of the main pipe, and the impurities on the inner wall cannot be cleaned, which is prone to blockage in the long run. For this reason, we propose a card-type electromagnetic flowmeter. Summary of the invention

[0005] The present invention proposes a snap-on electromagnetic flowmeter, which solves the problem that when the existing electromagnetic flowmeter in the related art is used to transport sewage or liquid with impurities, a small amount of impurities will adhere to the outer surface of the inner wall of the main pipe, and the impurities on the inner wall cannot be cleaned, which is prone to blockage in the long run.

[0006] The technical solution of the present invention is as follows:

[0007] A card-type electromagnetic flowmeter, comprising a main pipe and a pipeline, wherein a scraping structure is arranged inside the main pipe, a connecting plate is fixedly connected to one end of the pipeline, an indicating mechanism is arranged on the outer surface of the main pipe, and a display meter is fixedly connected to the outer surface of the main pipe;

[0008] The scraping structure includes a scraping component arranged inside the main pipe and a sealing component arranged between the connecting plate and the main pipe;

[0009] The scraper assembly comprises a rotating ring embedded in the main pipe, a fan blade is fixedly connected to the inner side of the rotating ring, an end of the fan blade is fixedly connected to an axis column, and a scraper rod is fixedly connected to the outer surface of the rotating ring.

[0010] As a further technical solution of the present invention, the sealing assembly includes a No. 1 annular groove opened at both ends of the main pipe, a magnetic block is arranged inside the No. 1 annular groove, elastic strips are fixedly connected to the outer surfaces of both ends of the main pipe, an end of the scraper rod away from the swivel is fixedly connected to an iron block, a No. 2 annular groove and a recessed groove are respectively opened on the outer surface of the connecting plate, a connecting hole is opened inside the main pipe, a bolt is movably arranged inside the connecting hole, and a rubber head is fixedly connected to the root of the bolt.

[0011] As a further technical solution of the present invention, the indicating mechanism includes a protective shell fixedly connected to the outer surface of the main pipe, a prompt tube is fixedly connected to the upper end of the protective shell, a movable part is slidably arranged inside the prompt tube, a rubber ring is arranged between the movable part and the inner wall of the prompt tube, and an indicating scale is arranged on the outer surface of the prompt tube.

[0012] As a further technical solution of the present invention, the rotating ring and the main pipe are rotatably connected through a bearing, the fan blades are in several groups and distributed in a ring array, the central axis is fixedly connected to the several groups of fan blades, the central axis is located at the middle axis of the rotating ring, and both ends of the central axis are hemispherical structures.

[0013] As a further technical solution of the present invention, there are two groups of scraper rods, which are "one long and one short" and are arranged on both sides of the swivel, and the two groups of scraper rods are in contact with the inner wall of the main pipe, and the shorter group of scraper rods is arranged on the water inlet end of the main pipe. The swivel is located on the outer surface of the inner wall of the main pipe close to the water inlet end, and the scraper rods clean the inner wall of the main pipe through the rotation of the swivel.

[0014] As a further technical solution of the present invention, the No. 2 annular groove matches the No. 1 annular groove, and the No. 2 annular groove and the No. 1 annular groove together form an annular groove structure. Matching through holes are provided at both ends of the connecting plate and the main pipe, and the through holes are used for connecting and fixing the connecting plate and the main pipe.

[0015] As a further technical solution of the present invention, the recessed groove matches the elastic strip, the iron block is located inside the main pipe close to the magnetic block, the magnetic block and the iron block are magnetically connected, the two ends of the magnetic block are hemispherical structures for reducing the resistance during rotation, the magnetic block slides along the channel formed by the No. 1 annular groove and the No. 2 annular groove, and the resistance to the sliding of the magnetic block is reduced by adding lubricating oil.

[0016] As a further technical solution of the present invention, one end of the connecting hole is connected to the interior of the No. 1 annular groove, and the other end is connected to the outside of the main pipe. The outer surface of the bolt near the top is provided with threads. The bolt matches one end of the connecting hole, and the angle of the bolt inserted into the connecting hole is 45°.

[0017] As a further technical solution of the present invention, the bolt forms a movable connection with the main pipe through the thread, the sealing inside the No. 1 annular groove is strengthened by the rubber head, and the magnetic block is driven to rotate synchronously by the rotation of the iron block.

[0018] As a further technical solution of the present invention, the rubber ring is fixedly connected to the movable part, the rubber ring is slidably connected to the prompt tube, the number of the indicating scales is two groups, the cavity formed by the protective shell and the main tube is filled with inert gas, and whether there is leakage in the middle of the main tube can be judged by the position of the rubber ring corresponding to the indicating scale.

[0019] The working principle and beneficial effects of the present invention are:

[0020] 1. In the present invention, the inner wall of the main pipe can be cleaned by the scraping structure, thereby reducing the adhesion of dirt to the inner and outer surfaces of the main pipe, and can enhance the sealing effect of the connecting plates connected to the two ends of the main pipe, effectively enhancing the sealing of the connection between the flow meter and the pipeline.

[0021] 2. In the present invention, through the function of the indicating mechanism, during use, the user can judge whether there is a leak inside the main pipe by observing the position of the rubber ring, so that the user can intuitively observe whether the main pipe is leaking, making it easier for the user to find small cracks and then quickly deal with them. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0025] Figure 3 For the present invention Figure 2 A schematic diagram of a local structure cut away from another perspective;

[0026] Figure 4 For the present invention Figure 3 A schematic diagram of the structure from another perspective;

[0027] Figure 5 It is a partial structural schematic diagram of the bolt disassembly and installation of the present invention;

[0028] Figure 6 For the present invention Figure 5 A partial side sectional view of

[0029] Figure 7It is a schematic diagram of the local structure of the indicating mechanism in the present invention.

[0030] In the figure: 1. main pipe; 2. pipeline; 3. scraper structure; 31. scraper assembly; 311. swivel; 312. fan blade; 313. axis column; 314. scraper rod; 32. sealing assembly; 321. No. 1 annular groove; 322. magnetic block; 323. elastic strip; 324. iron block; 325. No. 2 annular groove; 326. recessed groove; 327. connecting hole; 328. bolt; 329. rubber head; 4. connecting plate; 5. indicating mechanism; 51. protective shell; 52. prompt tube; 53. indicating scale; 54. movable part; 55. rubber ring; 6. display table. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figure 1 and Figure 7 As shown, this embodiment proposes a snap-on electromagnetic flowmeter, including a main pipe 1 and a pipeline 2, a scraping structure 3 is arranged inside the main pipe 1, a connecting plate 4 is fixedly connected to one end of the pipeline 2, an indicating mechanism 5 is arranged on the outer surface of the main pipe 1, and a display meter 6 is fixedly connected to the outer surface of the main pipe 1.

[0034] Example 2

[0035] like Figure 1 and Figure 7 As shown, on the basis of Example 1, it is further proposed that the scraping structure 3 includes a scraping assembly 31 arranged inside the main pipe 1 and a sealing assembly 32 arranged between the connecting plate 4 and the main pipe 1; the scraping assembly 31 includes a rotating ring 311 embedded in the main pipe 1, a fan blade 312 is fixedly connected to the inner side of the rotating ring 311, one end of the fan blade 312 is fixedly connected to the shaft column 313, and the outer surface of the rotating ring 311 is fixedly connected to a scraping rod 314 for scraping the inner wall of the main pipe 1;

[0036] The rotating ring 311 and the main pipe 1 are rotatably connected by a bearing, the number of fan blades 312 is several groups and distributed in a ring array, the shaft column 313 and the several groups of fan blades 312 are fixedly connected, the shaft column 313 is located at the middle axis of the rotating ring 311, and both ends of the shaft column 313 are hemispherical structures; the number of the scraper rods 314 is two groups, which are "one long and one short" and are arranged on both sides of the rotating ring 311, and the two groups of scraper rods 314 are in contact with the inner wall of the main pipe 1, and the shorter group of scraper rods 314 is arranged on the water inlet side of the main pipe 1, and the rotating ring 311 is located on the outer surface of the inner wall of the main pipe 1 near the water inlet end, and the scraper rods 314 clean the inner wall of the main pipe 1 through the rotation of the rotating ring 311, and continue to scrape and clean during the flow process to avoid possible blockage of the inner wall of the main pipe 1.

[0037] When water flows into the liquid inlet end of the main pipe 1 during use, the water flow will impact the plurality of blades 312, so that the blades 312 drive the shaft column 313 and the rotating ring 311 to rotate. At this time, the rotating ring 311 drives the scraping rod 314 to scrape the inner wall of the main pipe 1, thereby being able to cope with the situation where the liquid contains fine granular impurities, and the internal diameter of the main pipe 1 will not become smaller over time, and will not be blocked due to the flow meter itself.

[0038] Example 3

[0039] like Figure 1 and Figure 7 As shown, on the basis of Example 2, it is further proposed that the sealing assembly 32 includes a first annular groove 321 opened at both ends of the main pipe 1, a magnetic block 322 is arranged inside the first annular groove 321, elastic strips 323 are fixedly connected to the outer surfaces of both ends of the main pipe 1, an iron block 324 is fixedly connected to the end of the scraper rod 314 away from the rotating ring 311, a second annular groove 325 and a recessed groove 326 are respectively opened on the outer surface of the connecting plate 4, a connecting hole 327 is opened inside the main pipe 1, a bolt 328 is movably arranged inside the connecting hole 327, and a rubber head 329 is fixedly connected to the root of the bolt 328;

[0040] The second annular groove 325 matches the first annular groove 321. The second annular groove 325 and the first annular groove 321 together form an annular groove structure. Matching through holes are provided at both ends of the connecting plate 4 and the main pipe 1. The through holes are used to connect and fix the connecting plate 4 and the main pipe 1. The two ends of the magnetic block 322 are hemispherical structures for reducing the resistance during rotation. The magnetic block 322 slides along the channel formed by the first annular groove 321 and the second annular groove 325. The resistance of the magnetic block 322 to sliding is reduced by adding lubricating oil; the concave groove 326 matches the elastic strip 323, and the iron block 324 is located at the main pipe 1. Inside, near the magnet 322, the magnet 322 and the iron block 324 are magnetically connected; one end of the connecting hole 327 is connected to the inside of the No. 1 annular groove 321, and the other end is connected to the outside of the main pipe 1. The outer surface of the bolt 328 near the top is provided with a thread, and the bolt 328 matches one end of the connecting hole 327. The angle of the bolt 328 inserted into the connecting hole 327 is 45°; the bolt 328 forms a movable connection with the main pipe 1 through the thread, and the sealing of the inside of the No. 1 annular groove 321 is strengthened by the rubber head 329, and the magnet 322 is driven to rotate synchronously by the rotation of the iron block 324.

[0041] On the basis of Example 2, when the scraping rod 314 scrapes the inner wall of the main pipe 1, it will drive the iron block 324 to rotate synchronously. During the rotation of the iron block 324, under the action of magnetic force, the magnetic block 322 rotates with the iron block 324. Under the action of lubricating oil, the rotation of the magnetic block 322 can be smoother. At the same time, the rotating magnetic block 322 and the lubricating oil make its rotation direction tangent to the direction of liquid flow inside the pipeline 2, thereby strengthening the sealing effect of the gap after the connection between the connecting plate 4 and the end of the main pipe 1, so that the sealing effect of the connection between the main pipe 1 and the connecting plate 4 is better; when in use, the inner wall of the main pipe 1 can be cleaned, thereby reducing the adhesion of dirt to the outer surface of the inner wall of the main pipe 1, and the sealing effect of the two ends of the main pipe 1 and the connected connecting plate 4 can be strengthened, effectively strengthening the sealing effect of the connection between the flow meter and the pipeline;

[0042] After the two ends of the main pipe 1 are connected to the connecting plate 4, the No. 2 annular groove 325 and the No. 1 annular groove 321 form an annular groove structure, and the elastic strip 323 is just embedded in the inside of the recessed groove 326. Then the user first loosens the bolt 328 by turning it, takes out the bolt 328 together with the rubber head 329, and then injects liquid lubricating oil until the inside of the groove formed by the No. 1 annular groove 321 and the No. 2 annular groove 325 is filled. Then, the end of the bolt 328 corresponding to the connecting hole 327 is inserted and tightened, and one end of the connecting hole 327 is closed by the rubber head 329. The setting of the connecting hole 327 can avoid possible leakage of the lubricating oil, and the evaporation of the lubricating oil is greatly reduced by the rubber head 329.

[0043] Example 4

[0044] like Figure 1 and Figure 7 As shown, on the basis of Example 3, it is further proposed that the indicating mechanism 5 includes a protective shell 51 fixedly connected to the outer surface of the main pipe 1, the upper end of the protective shell 51 is fixedly connected to the prompt tube 52, a movable part 54 is slidably arranged inside the prompt tube 52, a rubber ring 55 is arranged between the movable part 54 and the inner wall of the prompt tube 52, and an indicating scale 53 is arranged on the outer surface of the prompt tube 52; the rubber ring 55 and the movable part 54 are fixedly connected, the rubber ring 55 and the prompt tube 52 are slidably connected, the number of indicating scales 53 is two groups, the cavity formed by the protective shell 51 and the main pipe 1 is filled with inert gas, and the position of the rubber ring 55 corresponding to the indicating scale 53 is used to judge whether the middle part of the main pipe 1 is leaking, so as to facilitate the user to intuitively observe the current status of the flow meter and avoid small cracks from developing into major leakage accidents.

[0045] When leakage occurs in the protection range of the protective shell 51, the liquid will flow into the cavity between the protective shell 51 and the main pipe 1. At this time, the air pressure in the cavity increases, which will squeeze the movable part 54 and the rubber ring 55 to move toward the upper end of the prompt tube 52. The setting of the indicating scale 53 can intuitively observe whether there is a small leakage in the main pipe 1. At the same time, the setting of the upper and lower groups of indicating scales 53 can limit the small movement of the movable part 54 and the rubber ring 55 up and down, which can be suitable for weather changes due to thermal expansion and contraction in four seasons. The movable part 54 and the rubber ring 55 within the range of the two groups of indicating scales 53 are within the normal range, while the flow meter is abnormal when it is outside the range of the indicating scale 53 and needs to be repaired. When a small leakage occurs in the main pipe 1, it can be discovered in time, thereby reminding the management personnel to deal with it in time. During use, the user can judge whether there is a leakage inside the main pipe 1 by observing the position of the rubber ring 55, so as to intuitively observe whether the main pipe 1 is leaking, so that the small cracks are easier to be discovered by the user, and then quickly dealt with.

[0046] In summary, the working principle and use process of the present invention are as follows:

[0047] During use, the liquid will first flow from one end of the pipe 2 into the liquid inlet end of the main pipe 1, and then flow through the interior of the main pipe 1 into the interior of the other end of the pipe 2. At this time, the flow inside the main pipe 1 will be measured by the electromagnetic induction principle, and the measurement results will be intuitively displayed on the display table 6. The user can judge the current flow situation in the pipe 2 according to the display results of the display table 6.

[0048] It should be noted that after the two ends of the main pipe 1 are connected to the connecting plate 4, the second annular groove 325 and the first annular groove 321 form an annular groove structure, and the elastic strip 323 is just embedded in the inside of the recessed groove 326. Then, the user first loosens the bolt 328, takes out the bolt 328 together with the rubber head 329, and then injects liquid lubricating oil until the inside of the groove formed by the first annular groove 321 and the second annular groove 325 is filled, and then inserts and tightens the end of the bolt 328 corresponding to the connecting hole 327, and closes the end of the connecting hole 327 through the rubber head 329 to prevent the lubricating oil from flowing out.

[0049] When water flows in from the liquid inlet end of the main pipe 1, the water will impact the plurality of blades 312, so that the blades 312 drive the shaft column 313 and the rotating ring 311 to rotate. At this time, the rotating ring 311 drives the scraping rod 314 to scrape the inner wall of the main pipe 1, so as to deal with the situation where there are fine granular impurities in the liquid, and the internal diameter of the main pipe 1 will not be reduced over time, and the flow meter will not be blocked due to the flow meter itself.

[0050] During the scraping process of the scraping rod 314, the iron block 324 will be driven to rotate synchronously. During the rotation of the iron block 324, under the action of magnetic force, the magnetic block 322 will rotate along with the iron block 324. Under the action of lubricating oil, the rotation of the magnetic block 322 can be smoother. At the same time, the rotating magnetic block 322 and the lubricating oil make its rotation direction tangent to the direction of liquid flow inside the pipeline 2, thereby enhancing the sealing effect of the gap after the connecting plate 4 is connected to the end of the main pipe 1, so that the sealing effect of the connection between the main pipe 1 and the connecting plate 4 is better.

[0051] During the use of the flow meter, when a leak occurs in the protection range of the protective shell 51, the liquid will flow into the cavity formed between the protective shell 51 and the main pipe 1. At this time, the air pressure in the cavity increases, which will squeeze the movable part 54 together with the rubber ring 55 to move toward the upper end of the prompt tube 52. The setting of the indicating scale 53 can intuitively observe whether there is a small leak in the main pipe 1. At the same time, the setting of the upper and lower groups of indicating scales 53 can limit the small amount of up and down movement of the movable part 54 together with the rubber ring 55, which can be suitable for weather changes due to thermal expansion and contraction in the four seasons. The movable part 54 together with the rubber ring 55 within the range of the two groups of indicating scales 53 is within the normal range, and when it is outside the range of the indicating scale 53, the flow meter is abnormal and needs to be repaired. When a small leak occurs in the main pipe 1, it can be discovered in time, thereby reminding the management personnel to deal with it in time.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A card-type electromagnetic flowmeter, characterized in that: It comprises a main pipe (1) and a pipeline (2), wherein a scraping structure (3) is arranged inside the main pipe (1), a connecting plate (4) is fixedly connected to one end of the pipeline (2), an indicating mechanism (5) is arranged on the outer surface of the main pipe (1), and a display meter (6) is fixedly connected to the outer surface of the main pipe (1); The scraping structure (3) comprises a scraping component (31) arranged inside the main pipe (1) and a sealing component (32) arranged between the connecting plate (4) and the main pipe (1); The scraping assembly (31) comprises a rotating ring (311) embedded in the main pipe (1), a fan blade (312) is fixedly connected to the inner side of the rotating ring (311), one end of the fan blade (312) is fixedly connected to a shaft column (313), and a scraping rod (314) is fixedly connected to the outer surface of the rotating ring (311); The sealing assembly (32) comprises a first annular groove (321) formed at both ends of the main pipe (1), a magnetic block (322) being arranged inside the first annular groove (321), elastic strips (323) being fixedly connected to the outer surfaces of both ends of the main pipe (1), an iron block (324) being fixedly connected to one end of the scraper rod (314) away from the rotating ring (311), a second annular groove (325) and a recessed groove (326) being respectively formed on the outer surface of the connecting plate (4), a connecting hole (327) being formed inside the main pipe (1), a bolt (328) being movably arranged inside the connecting hole (327), and a rubber head (329) being fixedly connected to the root of the bolt (328).

2. The card-type electromagnetic flowmeter according to claim 1, characterized in that: The indicating mechanism (5) comprises a protective shell (51) fixedly connected to the outer surface of the main pipe (1); a prompting tube (52) is fixedly connected to the upper end of the protective shell (51); a movable part (54) is slidably arranged inside the prompting tube (52); a rubber ring (55) is arranged between the movable part (54) and the inner wall of the prompting tube (52); and an indicating scale (53) is arranged on the outer surface of the prompting tube (52).

3. The card-type electromagnetic flowmeter according to claim 1, characterized in that: The rotating ring (311) and the main pipe (1) are rotatably connected via a bearing, the fan blades (312) are provided in a plurality of groups and are distributed in a ring-shaped array, the shaft column (313) and the plurality of groups of fan blades (312) are fixedly connected, the shaft column (313) is located at the middle axis of the rotating ring (311), and both ends of the shaft column (313) are hemispherical structures.

4. The card-type electromagnetic flowmeter according to claim 3, characterized in that: The scraper rods (314) are provided in two groups, one long and one short, on both sides of the rotating ring (311), and the two groups of scraper rods (314) are in contact with the inner wall of the main pipe (1), and the shorter group of scraper rods (314) is provided on the side of the water inlet end of the main pipe (1). The rotating ring (311) is located on the outer surface of the inner wall of the main pipe (1) close to the water inlet end, and the scraper rods (314) clean the inner wall of the main pipe (1) through the rotation of the rotating ring (311).

5. The card-type electromagnetic flowmeter according to claim 1, characterized in that: The second annular groove (325) matches the first annular groove (321); the second annular groove (325) and the first annular groove (321) together form an annular groove structure; matching through holes are provided at both ends of the connecting plate (4) and the main pipe (1); the through holes are used for connection and fixation between the connecting plate (4) and the main pipe (1).

6. The card-type electromagnetic flowmeter according to claim 5, characterized in that: The recessed groove (326) matches the elastic strip (323); the iron block (324) is located inside the main pipe (1) near the magnetic block (322); the magnetic block (322) and the iron block (324) are connected by magnetic force; both ends of the magnetic block (322) are hemispherical structures for reducing resistance during rotation; the magnetic block (322) slides along a channel formed by the first annular groove (321) and the second annular groove (325); and the resistance to sliding of the magnetic block (322) is reduced by adding lubricating oil.

7. The card-type electromagnetic flowmeter according to claim 6, characterized in that: One end of the connection hole (327) is connected to the interior of the No. 1 annular groove (321), and the other end is connected to the outside of the main pipe (1). The outer surface of the bolt (328) near the top is provided with a thread. The bolt (328) matches one end of the connection hole (327). The angle at which the bolt (328) is inserted into the connection hole (327) is 45°.

8. The card-type electromagnetic flowmeter according to claim 7, characterized in that: The bolt (328) is movably connected to the main pipe (1) through a thread, and the sealing performance inside the first annular groove (321) is enhanced through a rubber head (329), and the rotation of the iron block (324) drives the magnetic block (322) to rotate synchronously.

9. The card-type electromagnetic flowmeter according to claim 2, characterized in that: The rubber ring (55) and the movable part (54) are fixedly connected, the rubber ring (55) and the prompt tube (52) are slidably connected, the indicating scales (53) are provided in two groups, the cavity formed by the protective shell (51) and the main tube (1) is filled with an inert gas, and the position of the rubber ring (55) corresponding to the indicating scale (53) is used to determine whether the middle of the main tube (1) is leaking.

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