Electromagnetic water meter and continuous sampling method thereof

Abstract

This invention relates to the field of electromagnetic water meter technology, and discloses an electromagnetic water meter and its continuous sampling method. The electromagnetic water meter includes: a main pipe, a measuring module; two sets of pipe adapter mechanisms, each connected to a pipe fitting mechanism at its other end, which forms an adjustable-length sealed pipe between the main pipe and the fitting mechanism; two sets of adjusting mechanisms, each connected to a corresponding pipe adapter mechanism; and several sets of elastic telescopic pumping mechanisms, each connected between the fitting mechanism and the corresponding adjusting mechanism. This invention can be directly installed at the cut of an old pipe, and is applicable to cuts of different diameters and lengths, without requiring additional modifications to the old pipe. It effectively shortens the water outage time, improves sampling continuity, and is convenient and stable to install, making it widely applicable to the upgrading and renovation of various old pipes.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic water meter technology, and more specifically, to an electromagnetic water meter and its continuous sampling method. Background Technology

[0002] Conventional electromagnetic water meters are installed via flanged pipes. When assembling them onto the corresponding water pipes, the pipes need to be equipped with connecting flanges that match the electromagnetic water meter. Compared to building new pipelines, adding electromagnetic water meters to existing pipelines is more complicated, requiring cutting the old pipelines and welding connecting flanges at the cut points. Insertion-type electromagnetic water meters, on the other hand, require better sealing. Regardless of the modification method, it takes a long time to modify the old pipelines, resulting in high assembly costs and difficult installation of electromagnetic water meters.

[0003] In such an application environment, there is an urgent need for a low-cost and easy-to-install electromagnetic water meter specifically designed for the renovation and upgrading of old pipelines. Summary of the Invention

[0004] The purpose of this invention is to provide an electromagnetic water meter and its continuous sampling method in order to solve the above-mentioned problems.

[0005] This invention provides an electromagnetic water meter, comprising: A main pipeline, on which a measuring module is connected, the measuring module being used to acquire water flow data through the main pipeline; Two sets of pipe adapter mechanisms are connected to both ends of the main pipe, and the other end of each pipe adapter mechanism is connected to a pipe sleeve mechanism. The pipe adapter mechanism is used to form an adjustable-length sealed pipe between the main pipe and the pipe sleeve mechanism. Two sets of adjustment mechanisms, each set of which is connected to a corresponding pipeline adapter mechanism; Several sets of elastic telescopic air pumping mechanisms are respectively connected between the pipeline sleeve mechanism and the corresponding adjustment mechanism. The several sets of elastic telescopic air pumping mechanisms are used to limit the main pipeline, pipeline adapter mechanism and pipeline sleeve mechanism to be in a coaxial state. The pipeline connection mechanism includes a reducing sleeve assembly and an annular expansion pressure assembly connected to the reducing sleeve assembly. The elastic telescopic air pumping mechanism is used to apply axial pressure to the reducing sleeve assembly, and the elastic telescopic air pumping mechanism is connected to the annular expansion pressure assembly. The adjusting mechanism is used to drive the elastic telescopic air pumping mechanism to pump air into the annular expansion pressure assembly. The annular expansion pressure assembly is used to apply radial pressure to the outer wall of the old pipeline.

[0006] As a further optimization of the present invention, the pipeline adaptation mechanism includes a fixed pipe, a first telescopic corrugated pipe and a second telescopic corrugated pipe connected to the other end of the fixed pipe. The fixed pipe, the first telescopic corrugated pipe and the second telescopic corrugated pipe are all coaxially arranged. The second telescopic corrugated pipe is located outside the first telescopic corrugated pipe. One end of the fixed pipe is fixedly connected to the input end or output end of the main pipe.

[0007] As a further optimization of the present invention, the reducing sleeve assembly includes a reducing sleeve and a sealing gasket connected to the inner wall of the reducing sleeve. The sealing gasket is used to contact the old pipe along the axial direction of the reducing sleeve. The other ends of the first and second expansion bellows are fixedly connected to the reducing sleeve.

[0008] As a further optimization of the present invention, the annular expansion pressure assembly includes an annular bladder connected to the inner wall of the variable diameter sleeve, a venting channel 1 located inside the variable diameter sleeve, and a one-way valve 1 located inside the venting channel 1. The internal space of the elastic telescopic pumping mechanism is connected to the annular bladder through the venting channel 1. The one-way valve 1 is used to restrict the gas in the elastic telescopic pumping mechanism from flowing into the annular bladder in one direction. The annular bladder is used to contact the old pipeline along the radial direction of the variable diameter sleeve.

[0009] As a further optimization of the present invention, the one-way valve includes a ring plate 1 and a ring plate 2 fixedly connected to the inner wall of the one-way valve, a spring 1 fixedly connected to the ring plate 2, and a sealing plate 1 connected to the other end of the spring 1. The diameter of the sealing plate 1 is smaller than the inner diameter of the one-way valve, and the diameter of the sealing plate 1 is larger than the inner diameter of the ring plate 1.

[0010] As a further optimization of the present invention, the adjusting mechanism includes an annular fixed track fixedly connected to a fixed pipe, a limiting rotating ring movably connected to the annular fixed track, an annular gear fixedly connected to the inner circular surface of the limiting rotating ring, a plurality of screws movably connected to the annular fixed track, and driven gears fixedly connected to the screws. The plurality of screws are respectively threadedly connected to corresponding elastic telescopic pumping mechanisms, and the plurality of driven gears are all meshed with the annular gear.

[0011] As a further optimization of the present invention, the elastic telescopic pumping mechanism includes a second spring fixedly connected to a variable diameter sleeve and a square sleeve, a piston slidably connected inside the square sleeve, a hollow connecting pipe fixedly connected to the piston, a slot on the square sleeve, a partition fixedly connected to the inner wall of the slot, a plurality of vent holes on the partition, and a plastic sealing sheet connected to the partition. The plastic sealing sheet is located inside the square sleeve, and only one end of the plastic sealing sheet is fixedly connected to the partition. The plastic sealing sheet covers a plurality of vent holes. The other end of the second spring is fixedly connected to an annular fixed track. The hollow connecting pipe is threadedly connected to a screw.

[0012] As a further optimization of the present invention, the variable diameter sleeve is provided with a second ventilation channel, and the second ventilation channel is provided with a second one-way valve. One end of the second ventilation channel is connected to the area between the first annular plate and the square sleeve of the first ventilation channel, and the other end is connected to the sealed chamber formed between the fixed pipe, the first telescopic corrugated pipe, the second telescopic corrugated pipe and the variable diameter sleeve. The second one-way valve is used to restrict the gas in the square sleeve from flowing unidirectionally into the sealed chamber formed between the fixed pipe, the first telescopic corrugated pipe, the second telescopic corrugated pipe and the variable diameter sleeve.

[0013] As a further optimization of the present invention, the one-way valve two includes an annular plate three and an annular plate four fixedly connected to the inner wall of the ventilation channel two, a spring three fixedly connected to the annular plate four, and a sealing plate two connected to the other end of the spring three. The diameter of the sealing plate two is smaller than the inner diameter of the ventilation channel two, and the diameter of the sealing plate two is larger than the inner diameter of the annular plate three.

[0014] A continuous sampling method for an electromagnetic water meter, using an electromagnetic water meter as described above, includes the following steps: Step 100: Close the valves at both ends of the old pipe, cut the old pipe in the designated area, and create a cut blank section of the designated length on the old pipe; Step 200: Fit one of the pipe fitting mechanisms onto one of the gaps in the old pipe, squeeze the other pipe fitting mechanism and shorten both pipe fitting mechanisms until the distance between the two pipe fitting mechanisms is less than the length of the cut blank section, and then fit the other pipe fitting mechanism onto the other gap in the old pipe. Step 300: Drive several elastic telescopic air pumping mechanisms to continuously pump air into the annular expansion and pressurization assembly through the adjustment mechanism until the air pressure in the annular expansion and pressurization assembly reaches the set pressure. Step 400: Open the valves at both ends of the old pipeline and obtain the water flow data through the main pipeline using the measurement module.

[0015] The beneficial effects of this invention are as follows: This invention can be directly installed at the cut of old pipes, and is applicable to cut notches of different diameters and lengths. No additional modification to the old pipes is required. It can effectively shorten the water outage time of the pipes, improve the continuity of sampling, and the installation process is convenient and has high installation stability. It can be widely used in the renovation and upgrading of different old pipelines. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is the invention Figure 1 A partial sectional view; Figure 3This is a view showing the cooperation between the pipe adapter mechanism and the pipe sleeve mechanism of the present invention; Figure 4 This is the invention Figure 3 An enlarged view of point A in the image; Figure 5 This is the invention Figure 3 An enlarged view of point B in the image; Figure 6 This is the invention Figure 3 A magnified view of point C in the image; Figure 7 This is the invention Figure 3 A magnified view of point D in the image; Figure 8 This is the invention Figure 3 A magnified view of point E in the image.

[0017] In the diagram: 1. Main pipeline; 2. Measurement module; 3. Pipeline adapter mechanism; 301. Fixed pipeline; 302. Telescopic corrugated pipe I; 303. Telescopic corrugated pipe II; 4. Pipeline connection mechanism; 401. Reducing sleeve; 402. Sealing gasket; 403. Annular bladder; 404. Ventilation chamber I; 405. One-way valve I; 406. Ventilation chamber II; 407. One-way valve II; 5. Adjustment mechanism; 501. Annular fixed track; 502. Limiting rotating ring; 503. Ring gear; 504. Screw; 505. Driven gear; 6. Elastic telescopic pumping mechanism; 601. Spring II; 602. Square sleeve; 6020. Groove; 6021. Partition; 6022. Vent hole; 6023. Plastic sealing sheet; 603. Piston; 604. Hollow connecting pipe. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those skilled in the art to better understand and implement the subject matter described herein. Furthermore, features described in some examples may be combined in other examples.

[0019] like Figures 1-8 As shown, an electromagnetic water meter includes: Main pipe 1, with a measurement module 2 connected to it, the measurement module 2 is used to acquire water flow data through the main pipe 1; Two sets of pipe adapter mechanisms 3 are connected to both ends of the main pipe 1 respectively. The other end of the pipe adapter mechanism 3 is connected to a pipe sleeve mechanism 4. The pipe adapter mechanism 3 is used to form an adjustable length sealed pipe between the main pipe 1 and the pipe sleeve mechanism 4. Two sets of adjustment mechanisms 5 are respectively connected to the corresponding pipeline adapter mechanism 3; Several sets of elastic telescopic pumping mechanisms 6 are connected between the pipeline sleeve mechanism 4 and the corresponding adjustment mechanism 5. The several sets of elastic telescopic pumping mechanisms 6 are used to limit the main pipeline 1, the pipeline adapter mechanism 3 and the pipeline sleeve mechanism 4 to be in a coaxial state. The pipeline connection mechanism 4 includes a reducing sleeve assembly and an annular expansion pressure assembly connected to the reducing sleeve assembly. The elastic telescopic pumping mechanism 6 is used to apply axial pressure to the reducing sleeve assembly, and the elastic telescopic pumping mechanism 6 is connected to the annular expansion pressure assembly. The adjusting mechanism 5 is used to drive the elastic telescopic pumping mechanism 6 to pump air into the annular expansion pressure assembly. The annular expansion pressure assembly is used to apply radial pressure to the outer wall of the old pipeline.

[0020] It should be noted that when modifying an old pipeline, the valves at both ends of the old pipeline are closed, and a cut is made in a designated area on the old pipeline to create a blank section of a set length. One of the pipe fitting mechanisms 4 is fitted onto one of the gaps in the old pipe. The other pipe fitting mechanism 4 is squeezed and both pipe fitting mechanisms 3 are shortened until the distance between the two pipe fitting mechanisms 4 is less than the length of the cut blank section. Then the other pipe fitting mechanism 4 is fitted onto the other gap in the old pipe. The adjusting mechanism 5 drives several elastic telescopic air pumping mechanisms 6 to continuously pump air into the annular expansion and pressurizing assembly until the air pressure in the annular expansion and pressurizing assembly reaches the set pressure. By opening the valves at both ends of the old pipeline, the water flow data flowing through the main pipeline 1 is obtained through the measurement module 2, which effectively shortens the pipeline construction time, reduces the loss of water flow data during pipeline renovation, and improves the continuity of water flow data sampling.

[0021] In an optional embodiment of the invention, such as Figure 2 and Figure 3 As shown, the pipeline adapter 3 includes a fixed pipe 301, a first telescopic corrugated pipe 302 and a second telescopic corrugated pipe 303 connected to the other end of the fixed pipe 301. The fixed pipe 301, the first telescopic corrugated pipe 302 and the second telescopic corrugated pipe 303 are all coaxially arranged. The second telescopic corrugated pipe 303 is located outside the first telescopic corrugated pipe 302. One end of the fixed pipe 301 is fixedly connected to the input end or the output end of the main pipe 1.

[0022] It should be noted that when adjusting the distance between the pipe fitting mechanism 4 and the main pipe 1, the pipe fitting mechanism 4 can be squeezed and moved toward the main pipe 1. During this process, the first telescopic corrugated pipe 302 and the second telescopic corrugated pipe 303 are in a compressed state. In the initial state, the air pressure in the sealed area formed between the fixed pipe 301, the first telescopic corrugated pipe 302, the second telescopic corrugated pipe 303 and the pipe fitting mechanism 4 is low. The operator can easily overcome the elastic force of the elastic telescopic pumping mechanism 6 and the pressure in the sealed area formed between the fixed pipe 301, the first telescopic corrugated pipe 302, the second telescopic corrugated pipe 303 and the pipe fitting mechanism 4, and can conveniently shorten the distance between the two pipe fitting mechanisms 4. This makes it easy to insert the entire electromagnetic water meter into the cut notch section on the old pipe. Then, releasing the pipe fitting mechanism 4 will allow it to reset and fit onto the corresponding cut end of the old pipe.

[0023] In an optional embodiment of the invention, such as Figure 3 and Figure 7 As shown, the reducing sleeve assembly includes a reducing sleeve 401 and a sealing gasket 402 connected to the inner wall of the reducing sleeve 401. The sealing gasket 402 is used to contact the old pipe along the axial direction of the reducing sleeve 401. The other ends of the expansion bellows 1 302 and expansion bellows 2 303 are fixedly connected to the reducing sleeve 401.

[0024] The annular expansion pressurization assembly includes an annular bladder 403 connected to the inner wall of the reducing sleeve 401, a venting channel 404 located inside the reducing sleeve 401, and a one-way valve 405 located inside the venting channel 404. The internal space of the elastic telescopic pumping mechanism 6 is connected to the annular bladder 403 through the venting channel 404. The one-way valve 405 is used to restrict the unidirectional flow of gas in the elastic telescopic pumping mechanism 6 into the annular bladder 403. The annular bladder 403 is used to contact the old pipeline radially along the reducing sleeve 401.

[0025] One-way valve 405 includes a ring plate 1 and a ring plate 2 fixedly connected to the inner wall of one-way valve 405, a spring 1 fixedly connected to the ring plate 2, and a sealing plate 1 connected to the other end of the spring 1. The diameter of the sealing plate 1 is smaller than the inner diameter of one-way valve 405, and the diameter of the sealing plate 1 is larger than the inner diameter of the ring plate 1.

[0026] It should be noted that, as mentioned above, when the pipe fitting mechanism 4 is fitted onto the cut end of the old pipe, the reducing sleeve 401 is fitted onto the cut end of the old pipe, and under the elastic force of the elastic telescopic air pumping mechanism 6, the sealing gasket 402 is tightly pressed against the cut end of the old pipe, while the annular bladder 403 is not in contact with the outer surface of the old pipe at this time. As the control and adjustment mechanism 5 drives the corresponding elastic telescopic air pumping mechanism 6 to operate, the elastic telescopic air pumping mechanism 6 begins to continuously pump air into the annular bladder 403. The air flows through the ventilation cavity 404 and the ring plate in sequence. At this time, the sealing plate is tightly pressed against the spring. On the first ring plate, under the action of airflow, the first sealing plate is subjected to force and squeezes the first spring. At this time, the first ring plate is in a ventilated state, and the gas can continue to flow. It flows through the second ring plate and the remaining ventilated cavity 404 in sequence and then enters the annular bladder 403. With the continuous pumping process, the air pressure inside the annular bladder 403 gradually increases, causing the annular bladder 403 to expand continuously until the annular bladder 403 contacts the outer circular surface of the cut end of the old pipe and applies the set pressure. At this time, the entire reducing sleeve 401 is in a coaxial state with the old pipe and can be stably clamped on the cut end of the old pipe. It also works with the sealing gasket 402 to achieve a tight sealing effect.

[0027] In an optional embodiment of the invention, such as Figure 3 and Figure 4 As shown, the adjusting mechanism 5 includes an annular fixed track 501 fixedly connected to the fixed pipe 301, a limiting rotating ring 502 movably connected to the annular fixed track 501, an annular gear 503 fixedly connected to the inner circular surface of the limiting rotating ring 502, several screws 504 movably connected to the annular fixed track 501, and driven gears 505 fixedly connected to the screws 504. The several screws 504 are respectively threadedly connected to the corresponding elastic telescopic pumping mechanism 6, and the several driven gears 505 are all meshed with the annular gear 503.

[0028] It should be noted that, as mentioned above, when the elastic telescopic pumping mechanism 6 is continuously pumped by the adjusting mechanism 5, the limiting ring 502 is rotated, causing the ring gear 503 connected to it to rotate in the same direction and at the same angle. During the rotation of the ring gear 503, several driven gears 505 can be driven to rotate in the same direction and at the same angle. During this process, the driven gears 505 can drive the screw 504 to rotate in the same direction and at the same angle. As the screw 504 rotates, it can drive the elastic telescopic pumping mechanism 6 to extend or shorten. Similarly, the opposite rotation can drive the elastic telescopic pumping mechanism 6 to shorten or extend, thereby realizing the reciprocating pumping action. In one embodiment of the present invention, the screw 504 can also be a reciprocating lead screw. If a reciprocating lead screw is used, there is no need to control the forward and reverse rotation of the limiting ring 502, but a slider that cooperates with the reciprocating lead screw needs to be set on the elastic telescopic pumping mechanism 6.

[0029] In an optional embodiment of the invention, such as Figures 3-8 As shown, the elastic telescopic pumping mechanism 6 includes a spring 601 and a square sleeve 602 fixedly connected to the variable diameter sleeve 401, a piston 603 slidably connected inside the square sleeve 602, a hollow connecting pipe 604 fixedly connected to the piston 603, a slot 6020 on the square sleeve 602, a partition 6021 fixedly connected to the inner wall of the slot 6020, several vent holes 6022 on the partition 6021, and a plastic sealing sheet 6023 connected to the partition 6021. The plastic sealing sheet 6023 is located inside the square sleeve 602, and only one end of the plastic sealing sheet 6023 is fixedly connected to the partition 6021. The plastic sealing sheet 6023 covers several vent holes 6022. The other end of the spring 601 is fixedly connected to the annular fixed track 501. The hollow connecting pipe 604 is threadedly connected to the screw 504.

[0030] It should be noted that, as described above, when the elastic telescopic pumping mechanism 6 is driven to reciprocate and extend through the adjusting mechanism 5 to perform pumping action, the hollow connecting pipe 604, which is threadedly connected to the screw 504, begins to reciprocate, driving the piston 603 connected to it to reciprocate within the square sleeve 602. When the piston 603 moves away from the reducing sleeve 401, a negative pressure is formed inside the square sleeve 602. Under this negative pressure, the plastic sealing sheet 6023 is stressed and bends towards the inside of the square sleeve 602, and several vent holes 6022 are in a conductive state. In this state, outside air can enter the square sleeve 602 under negative pressure, while the sealing plate tightly seals the channel on the ring plate, thus pumping outside air into the square sleeve 602. As the piston 603 approaches the reducing sleeve 401, positive pressure is formed inside the square sleeve 602. At this time, the plastic sealing sheet 6023 tightly seals several vent holes 6022 under pressure, while the sealing plate is pushed open. At this time, air can be pumped into the annular bladder 403. With the reciprocating movement of the hollow connecting pipe 604, a continuous pumping effect is achieved.

[0031] In an optional embodiment of the invention, such as Figure 3 and Figure 7As shown, the reducing sleeve 401 has a second ventilation channel 406 inside, and a second one-way valve 407 inside the second ventilation channel 406. One end of the second ventilation channel 406 is connected to the area between the first ventilation channel 404 and the square sleeve 602, and the other end is connected to the sealed chamber formed between the fixed pipe 301, the first telescopic corrugated pipe 302, the second telescopic corrugated pipe 303 and the reducing sleeve 401. The second one-way valve 407 is used to restrict the gas in the square sleeve 602 from flowing into the sealed chamber formed between the fixed pipe 301, the first telescopic corrugated pipe 302, the second telescopic corrugated pipe 303 and the reducing sleeve 401 in one direction.

[0032] One-way valve 407 includes a ring plate 3 and a ring plate 4 fixedly connected to the inner wall of the ventilation channel 406, a spring 3 fixedly connected to the ring plate 4, and a sealing plate 2 connected to the other end of the spring 3. The diameter of the sealing plate 2 is smaller than the inner diameter of the ventilation channel 406, and the diameter of the sealing plate 2 is larger than the inner diameter of the ring plate 3.

[0033] It should be noted that, in order to increase the pressure of the axial contact between the pipe sleeve mechanism 4 and the old pipe, and to improve the radial stability of the second expansion bellows 303, and to prevent excessive water pressure from causing the second expansion bellows 303 to deform towards the first expansion bellows 302, thus causing deviations in the water flow data, while pumping gas into the annular bladder 403, the gas can flow through the second ventilation channel 406. Under the action of the second check valve 407, the gas can only be pumped unidirectionally into the sealed chamber formed between the fixed pipe 301, the first expansion bellows 302, the second expansion bellows 303, and the reducing sleeve 401. This allows sufficient pressure outside the first expansion bellows 302 to counteract the water pressure, thereby keeping the flow rate stable. It also allows the reducing sleeve 401 to press against the cut end of the old pipe at a set pressure, achieving stable contact and sealing effects, and ultimately making the entire electromagnetic water meter and the old pipe a stable integrated structure.

[0034] The above description of this embodiment is not limited to the specific implementation described above. The specific implementation described above is merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this embodiment, all of which are within the protection scope of this embodiment.

Claims

1. An electromagnetic water meter, characterized by include: A main pipeline (1) is connected to a measuring module (2), which is used to acquire water flow data through the main pipeline (1); Two sets of pipe fitting mechanisms (3) are respectively connected to both ends of the main pipe (1). The other end of the pipe fitting mechanism (3) is connected to a pipe sleeve mechanism (4). The pipe fitting mechanism (3) is used to form an adjustable length sealed pipe between the main pipe (1) and the pipe sleeve mechanism (4). The pipe fitting mechanism (3) includes a fixed pipe (301). Two sets of adjustment mechanisms (5) are respectively connected to the corresponding pipeline adapter mechanism (3); the adjustment mechanism (5) includes an annular fixed track (501) fixedly connected to the fixed pipeline (301), a limiting rotating ring (502) movably connected to the annular fixed track (501), an annular gear (503) fixedly connected to the inner circular surface of the limiting rotating ring (502), a plurality of screws (504) movably connected to the annular fixed track (501), and a driven gear (505) fixedly connected to the screws (504), wherein the plurality of driven gears (505) mesh with the annular gear (503); Several sets of elastic telescopic air pumping mechanisms (6) are connected between the pipeline sleeve mechanism (4) and the corresponding adjustment mechanism (5). The pipe fitting mechanism (4) includes a reducing fitting assembly and an annular expansion pressure-applying assembly connected to the reducing fitting assembly. Several sets of elastic telescopic pumping mechanisms (6) are used to restrict the main pipe (1), the pipe fitting mechanism (3), and the pipe fitting mechanism (4) to be in a coaxial state and to apply axial pressure to the reducing fitting assembly. The elastic telescopic pumping mechanism (6) is connected to the annular expansion pressure-applying assembly. The adjusting mechanism (5) is used to drive the elastic telescopic pumping mechanism (6) to pump air into the annular expansion pressure-applying assembly. The annular expansion pressure-applying assembly is used to apply pressure to the outer wall of the old pipe. Radial pressure, the variable diameter sleeve assembly includes a variable diameter sleeve (401), the elastic telescopic pumping mechanism (6) includes a spring two (601) fixedly connected to the variable diameter sleeve (401) and a square sleeve (602), a piston (603) slidably connected inside the square sleeve (602), and a hollow connecting pipe (604) fixedly connected to the piston (603). The other end of the spring two (601) is fixedly connected to the annular fixed track (501), and several screws (504) are respectively threadedly connected to the corresponding hollow connecting pipes (604).

2. An electromagnetic water meter according to claim 1, characterized in that The pipeline adapter mechanism (3) also includes a first telescopic corrugated pipe (302) and a second telescopic corrugated pipe (303) connected to the other end of the fixed pipe (301). The fixed pipe (301), the first telescopic corrugated pipe (302) and the second telescopic corrugated pipe (303) are all coaxially arranged. The second telescopic corrugated pipe (303) is located outside the first telescopic corrugated pipe (302). One end of the fixed pipe (301) is fixedly connected to the input end or the output end of the main pipe (1).

3. An electromagnetic water meter according to claim 2, characterized in that, The reducing sleeve assembly also includes a sealing gasket (402) connected to the inner wall of the reducing sleeve (401). The sealing gasket (402) is used to contact the old pipe along the axial direction of the reducing sleeve (401). The other ends of the first telescopic corrugated pipe (302) and the second telescopic corrugated pipe (303) are fixedly connected to the reducing sleeve (401).

4. An electromagnetic water meter according to claim 3, characterized in that, The annular expansion pressure assembly includes an annular bladder (403) connected to the inner wall of the reducing sleeve (401), a ventilation channel (404) located inside the reducing sleeve (401), and a one-way valve (405) located inside the ventilation channel (404). The internal space of the elastic telescopic pumping mechanism (6) is connected to the annular bladder (403) through the ventilation channel (404). The one-way valve (405) is used to restrict the gas in the elastic telescopic pumping mechanism (6) from flowing into the annular bladder (403) in one direction. The annular bladder (403) is used to contact the old pipeline along the radial direction of the reducing sleeve (401).

5. An electromagnetic water meter according to claim 4, characterized in that, The one-way valve (405) includes a ring plate 1 and a ring plate 2 fixedly connected to the inner wall of the one-way valve (405), a spring 1 fixedly connected to the ring plate 2, and a sealing plate 1 connected to the other end of the spring 1. The diameter of the sealing plate 1 is smaller than the inner diameter of the one-way valve (405), and the diameter of the sealing plate 1 is larger than the inner diameter of the ring plate 1.

6. An electromagnetic water meter according to claim 5, characterized in that, The elastic telescopic air pumping mechanism (6) further includes a slot (6020) on a square sleeve (602), a partition (6021) fixedly connected to the inner wall of the slot (6020), a plurality of vent holes (6022) on the partition (6021), and a plastic sealing sheet (6023) connected to the partition (6021). The plastic sealing sheet (6023) is located inside the square sleeve (602), and only one end of the plastic sealing sheet (6023) is fixedly connected to the partition (6021). The plastic sealing sheet (6023) covers the plurality of vent holes (6022).

7. An electromagnetic water meter according to claim 6, characterized in that, The variable diameter sleeve (401) is provided with a second ventilation channel (406) inside. The second ventilation channel (406) is provided with a second one-way valve (407) inside. One end of the second ventilation channel (406) is connected to the area between the first ventilation channel (404) and the square sleeve (602), and the other end is connected to the sealed chamber formed between the fixed pipe (301), the first telescopic corrugated pipe (302), the second telescopic corrugated pipe (303) and the variable diameter sleeve (401). The second one-way valve (407) is used to restrict the gas in the square sleeve (602) from flowing into the sealed chamber formed between the fixed pipe (301), the first telescopic corrugated pipe (302), the second telescopic corrugated pipe (303) and the variable diameter sleeve (401) in one direction.

8. An electromagnetic water meter according to claim 7, characterized in that, The one-way valve 2 (407) includes a ring plate 3, a ring plate 4, a spring 3 fixedly connected to the inner wall of the ventilation channel 2 (406), and a sealing plate 2 connected to the other end of the spring 3. The diameter of the sealing plate 2 is smaller than the inner diameter of the ventilation channel 2 (406), and the diameter of the sealing plate 2 is larger than the inner diameter of the ring plate 3.

9. A continuous sampling method for an electromagnetic water meter, characterized in that, The electromagnetic water meter as described in any one of claims 1-8 comprises the following steps: Step 100: Close the valves at both ends of the old pipe, cut the old pipe in the designated area, and create a cut blank section of the designated length on the old pipe; Step 200: Fit one of the pipe fitting mechanisms (4) onto one of the gaps in the old pipe, squeeze the other pipe fitting mechanism (4) and shorten both pipe fitting mechanisms (3) until the distance between the two pipe fitting mechanisms (4) is less than the length of the cut blank section, and then fit the other pipe fitting mechanism (4) onto the other gap in the old pipe. Step 300: The adjustment mechanism (5) drives several elastic telescopic air pumping mechanisms (6) to continuously pump air into the annular expansion pressure assembly until the air pressure in the annular expansion pressure assembly reaches the set pressure. Step 400: Open the valves at both ends of the old pipeline and obtain the water flow data of the main pipeline (1) through the measurement module (2).

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