Electromagnetic water meter and continuous sampling method thereof

Abstract

The invention relates to the technical field of electromagnetic water meters, and discloses an electromagnetic water meter and a continuous sampling method thereof.The electromagnetic water meter comprises a main pipeline and a measuring module; the other ends of the pipeline adapting mechanisms are connected with pipeline sleeving mechanisms, and the pipeline adapting mechanisms are used for forming length-adjustable sealing pipelines between the main pipeline and the pipeline sleeving mechanisms; the two groups of adjusting mechanisms are respectively connected to the corresponding pipeline adaptation mechanisms; the plurality of groups of elastic telescopic air pumping mechanisms are respectively connected between the pipeline sleeving mechanism and the corresponding adjusting mechanisms; the device can be directly installed at the cutting position of an old pipeline, can be suitable for notches with different diameters and lengths, does not need to additionally modify the old pipeline, can effectively shorten the water cut-off time of the pipeline, improves the sampling continuity, is convenient in installation process and high in installation stability, and can be widely applied to modification and upgrading of different old pipelines.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic water meters, and more particularly to an electromagnetic water meter and a continuous sampling method thereof. Background Art

[0002] Conventional electromagnetic water meters are installed in flange pipe style. When assembled on the corresponding water pipe, the corresponding water pipe needs to be equipped with a connecting flange that matches the electromagnetic water meter. Compared with the construction of new pipelines, it is more cumbersome to add electromagnetic water meters to old pipelines. The old pipelines need to be cut and the connecting flanges need to be welded at the cuts. Insertion-type electromagnetic water meters require better sealing treatment. Regardless of the modification method, it takes a long time to improve the old pipelines, resulting in relatively 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 for the renovation and upgrading of old pipelines. Summary of the Invention

[0004] The purpose of the present invention is to provide an electromagnetic water meter and a continuous sampling method thereof in order to solve the above problems.

[0005] The present invention provides an electromagnetic water meter, comprising: A main pipeline, wherein a measuring module is connected to the main pipeline, and the measuring module is used to obtain water flow data passing through the main pipeline; Two sets of pipeline adapter mechanisms, the two sets of pipeline adapter mechanisms are respectively connected to the two ends of the main pipeline, the other ends of the pipeline adapter mechanisms are connected to the pipeline sleeve mechanism, and the pipeline adapter mechanism is used to form a sealed pipeline with adjustable length between the main pipeline and the pipeline sleeve mechanism; Two sets of adjustment mechanisms, the two sets of adjustment mechanisms are respectively connected to corresponding pipeline adapter mechanisms; Several groups of elastic telescopic pumping mechanisms, each of which is connected between the pipeline sleeve mechanism and the corresponding adjustment mechanism, and is used to restrict the main pipeline, the pipeline adapter mechanism and the pipeline sleeve mechanism to be in a coaxial state; The pipeline sleeve mechanism includes a reducing sleeve assembly and an annular expansion and 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 and pressure assembly. The adjustment mechanism is used to drive the elastic telescopic air pumping mechanism to pump air into the annular expansion and pressure assembly, and the annular expansion and pressure assembly is used to apply radial pressure to the outer wall of the old pipeline.

[0006] As a further optimization scheme of the present invention, the pipeline adapter mechanism includes a fixed pipeline, a telescopic bellows 1 and a telescopic bellows 2 connected to the other end of the fixed pipeline, the fixed pipeline, the telescopic bellows 1 and the telescopic bellows 2 are all coaxially arranged, the telescopic bellows 2 is arranged outside the telescopic bellows 1, and one end of the fixed pipeline is fixedly connected to the input end or the output end of the main pipeline.

[0007] As a further optimization scheme 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, and the other ends of the telescopic bellows 1 and the telescopic bellows 2 are fixedly connected to the reducing sleeve.

[0008] As a further optimization scheme of the present invention, the annular expansion and pressure-applying assembly includes an annular sac connected to the inner wall of the reducing sleeve, a ventilation cavity one provided inside the reducing sleeve, and a one-way valve one provided inside the ventilation cavity one. The internal space of the elastic telescopic pumping mechanism is connected to the annular sac through the ventilation cavity one. The one-way valve one is used to limit the one-way flow of gas in the elastic telescopic pumping mechanism into the annular sac. The annular sac is used to contact the old pipe along the radial direction of the reducing sleeve.

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

[0010] As a further optimization scheme of the present invention, the adjustment mechanism includes an annular fixed track fixedly connected to the fixed pipe, a limiting swivel movably connected to the annular fixed track, an annular gear fixedly connected to the inner circular surface of the limiting swivel, a plurality of screws movably connected to the annular fixed track and a driven gear fixedly connected to the screw, and several of the screws are respectively threadedly connected to the corresponding elastic telescopic pump air mechanisms, and several of the driven gears are engaged with the annular gear.

[0011] As a further optimization scheme of the present invention, the elastic telescopic pump air mechanism includes a spring 2 and a square sleeve fixedly connected to the reducing sleeve, a piston part slidably connected to the inside of the square sleeve, a hollow connecting pipe fixedly connected to the piston part, a notch provided on the square sleeve, a partition fixedly connected to the inner wall of the notch, a plurality of air holes provided 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 the plurality of air holes, the other end of the spring 2 is fixedly connected to the annular fixed track, and the hollow connecting pipe is threadedly connected to the screw.

[0012] As a further optimization scheme of the present invention, a second ventilation cavity is provided inside the reducing sleeve, and a second one-way valve is provided inside the second ventilation cavity. One end of the second ventilation cavity is connected to the area of ​​the first ventilation cavity between the first ring plate and the square sleeve, and the other end is connected to the sealed chamber formed between the fixed pipe, the first telescopic bellows, the second telescopic bellows and the reducing sleeve. The second one-way valve is used to limit the gas in the square sleeve to flow into the sealed chamber formed between the fixed pipe, the first telescopic bellows, the second telescopic bellows and the reducing sleeve in one direction.

[0013] As a further optimization scheme of the present invention, the one-way valve 2 includes a ring plate 3 fixedly connected to the inner wall of the ventilation cavity 2, a ring plate 4, 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 cavity 2, and the diameter of the sealing plate 2 is larger than the inner diameter of the ring plate 3.

[0014] A continuous sampling method for an electromagnetic water meter, using the electromagnetic water meter as described above, comprises the following steps: Step 100: Close the valves at both ends of the old pipe and cut a set area on the old pipe to form a blank cutting section of a set length on the old pipe; Step 200: Sleeve one of the pipe sleeve mechanisms onto one of the notched ends of the old pipe, squeeze the other pipe sleeve mechanism and shorten both pipe adapter mechanisms until the distance between the two pipe sleeve mechanisms is less than the length of the cut blank section, and then sleeve the other pipe sleeve mechanism onto the other notched end of the old pipe; Step 300: driving a plurality of elastic and retractable pumping mechanisms to continuously pump air into the annular expansion and pressure component through the regulating mechanism until the air pressure in the annular expansion and pressure component reaches a set pressure; Step 400: Open the valves at both ends of the old pipeline and obtain water flow data flowing through the main pipeline through the measurement module.

[0015] The beneficial effects of the present invention are that the present invention can be directly installed at the cut of the old pipeline, is applicable to incisions of different diameters and lengths, does not require additional modification of the old pipeline, can effectively shorten the water outage time of the pipeline, improves the continuity of sampling, and has a convenient installation process and high installation stability, and can be widely used in the modification and upgrading of different old pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 The present invention Figure 1 A partial cross-sectional view of Figure 3This is a diagram showing the cooperation between the pipeline adapter mechanism and the pipeline sleeve mechanism of the present invention; Figure 4 The present invention Figure 3 Magnified view at A in FIG; Figure 5 The present invention Figure 3 Magnified view at B in FIG; Figure 6 The present invention Figure 3 Magnified view of point C in FIG; Figure 7 The present invention Figure 3 Magnified view at D in FIG; Figure 8 The present invention Figure 3 Magnified view of E in FIG.

[0017] In the figure: 1. Main pipeline; 2. Measuring module; 3. Pipeline adapter mechanism; 301. Fixed pipeline; 302. Telescopic bellows 1; 303. Telescopic bellows 2; 4. Pipeline sleeve mechanism; 401. Reducer sleeve; 402. Sealing gasket; 403. Annular capsule; 404. Ventilation cavity 1; 405. One-way valve 1; 406. Ventilation cavity 2; 407. One-way valve 2; 5. Adjustment mechanism; 501. Annular fixed track; 502. Limiting swivel; 503. Ring gear; 504. Screw; 505. Driven gear; 6. Elastic telescopic pumping mechanism; 601. Spring 2; 602. Square sleeve; 6020. Notch; 6021. Partition; 6022. Ventilation hole; 6023. Plastic sealing sheet; 603. Piston; 604. Hollow connecting pipe. DETAILED DESCRIPTION

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

[0019] like Figures 1-8 As shown, an electromagnetic water meter includes: A main pipe 1 is connected to a measuring module 2, which is used to obtain water flow data passing through the main pipe 1; Two sets of pipeline adapter mechanisms 3, the two sets of pipeline adapter mechanisms 3 are respectively connected to the two ends of the main pipeline 1, and the other ends of the pipeline adapter mechanisms 3 are connected to the pipeline sleeve mechanism 4, and the pipeline adapter mechanisms 3 are used to form a sealed pipeline with adjustable length between the main pipeline 1 and the pipeline sleeve mechanism 4; Two sets of adjustment mechanisms 5, the two sets of adjustment mechanisms 5 are respectively connected to the corresponding pipeline adapter mechanisms 3; Several sets of elastic telescopic pumping mechanisms 6 are respectively connected between the pipeline sleeve mechanism 4 and the corresponding adjustment mechanism 5, and 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 sleeve mechanism 4 includes a reducing sleeve assembly and an annular expansion and pressure-applying assembly connected to the reducing sleeve assembly. The elastic telescopic air pumping mechanism 6 is used to apply axial pressure to the reducing sleeve assembly, and the elastic telescopic air pumping mechanism 6 is connected to the annular expansion and pressure-applying assembly. The adjustment mechanism 5 is used to drive the elastic telescopic air pumping mechanism 6 to pump air into the annular expansion and pressure-applying assembly, and the annular expansion and pressure-applying assembly is used to apply radial pressure to the outer wall of the old pipe.

[0020] It should be noted that when renovating an old pipeline, the valves at both ends of the old pipeline are closed, and a cut is made at a set area on the old pipeline to form a blank cutting section of a set length on the old pipeline; Sleeve one of the pipe sleeve mechanisms 4 onto one of the notched ends of the old pipe, squeeze the other pipe sleeve mechanism 4 and shorten both pipe adapter mechanisms 3 until the distance between the two pipe sleeve mechanisms 4 is less than the length of the cut blank section, and then sleeve the other pipe sleeve mechanism 4 onto the other notched end of the old pipe; The regulating mechanism 5 drives a plurality of elastic and telescopic pumping mechanisms 6 to continuously pump air into the annular expansion and pressure component until the air pressure in the annular expansion and pressure component reaches the set pressure; Open the valves at both ends of the old pipeline and obtain the water flow data flowing through the main pipeline 1 through the measurement module 2, thereby effectively shortening the pipeline construction time, effectively reducing the loss of water flow data during pipeline reconstruction, and improving the continuity of water flow data sampling.

[0021] In an optional embodiment of the present invention, Figure 2 and Figure 3 As shown, the pipeline adapter mechanism 3 includes a fixed pipe 301, a telescopic bellows 1 302 and a telescopic bellows 2 303 connected to the other end of the fixed pipe 301. The fixed pipe 301, the telescopic bellows 1 302 and the telescopic bellows 2 303 are all coaxially arranged, the telescopic bellows 2 303 is arranged outside the telescopic bellows 1 302, and 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 sleeve mechanism 4 and the main pipe 1, the pipe sleeve mechanism 4 can be squeezed and moved toward the main pipe 1. During this process, the telescopic bellows 1 302 and the telescopic bellows 2 303 are in a compressed state. In the initial state, the air pressure in the sealing area formed between the fixed pipe 301, the telescopic bellows 1 302, the telescopic bellows 2 303 and the pipe sleeve mechanism 4 is low. The staff can easily overcome the elastic force of the elastic telescopic pump air mechanism 6 and the pressure in the sealing area formed between the fixed pipe 301, the telescopic bellows 1 302, the telescopic bellows 2 303 and the pipe sleeve mechanism 4, and can conveniently shorten the distance between the two pipe sleeve mechanisms 4, thereby facilitating the insertion of the entire electromagnetic water meter into the notch section cut on the old pipe. Then, the pipe sleeve mechanism 4 can be reset and sleeved on the corresponding cut end of the old pipe by loosening the pipe sleeve mechanism 4.

[0023] In an optional embodiment of the present invention, 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 telescopic bellows 1 302 and the telescopic bellows 2 303 are both fixedly connected to the reducing sleeve 401.

[0024] The annular expansion and pressure-applying assembly includes an annular sac 403 connected to the inner wall of the reducing sleeve 401, a ventilation cavity 404 provided inside the reducing sleeve 401, and a one-way valve 405 provided inside the ventilation cavity 404. The internal space of the elastic telescopic pumping mechanism 6 is connected to the annular sac 403 through the ventilation cavity 404. The one-way valve 405 is used to limit the one-way flow of gas in the elastic telescopic pumping mechanism 6 into the annular sac 403. The annular sac 403 is used to contact the old pipe along the radial direction of the reducing sleeve 401.

[0025] The one-way valve 405 includes a ring plate 1 fixedly connected to the inner wall of the one-way valve 405, a ring plate 2, 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.

[0026] It should be noted that, as mentioned above, when the pipeline sleeve mechanism 4 is sleeved on the cut end of the old pipe, the reducing sleeve 401 is sleeved on the cut end of the old pipe, and under the elastic force of the elastic telescopic pumping mechanism 6, the sealing gasket 402 is tightly abutted against the cut end of the old pipe, and the annular sac 403 is not in contact with the outer circular surface of the old pipe at this time. As the control and adjustment mechanism 5 drives the corresponding elastic telescopic pumping mechanism 6 to operate, the elastic telescopic pumping mechanism 6 begins to continuously pump air into the annular sac 403, and the air flows through the ventilation cavity 1 404 and the ring plate 1 in turn. At this time, the sealing plate 1 is tightly pressed under the action of the spring 1. On the ring plate 1, and under the action of the airflow, the sealing plate 1 is subjected to force and squeezes the spring 1. At this time, the ring plate 1 is in a ventilated state, and the gas can continue to flow, and flows through the ring plate 2 and the remaining ventilation cavity 1 404 in turn, and then enters the annular capsule 403. With the continuous pumping process, the air pressure inside the annular capsule 403 gradually increases, and the annular capsule 403 continues to expand until the annular capsule 403 contacts the outer circular surface of the cut end of the old pipe and applies the set pressure. 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, and cooperate with the sealing gasket 402 to achieve a tight sealing effect.

[0027] In an optional embodiment of the present invention, Figure 3 and Figure 4 As shown, the adjustment mechanism 5 includes an annular fixed track 501 fixedly connected to the fixed pipe 301, a limiting swivel 502 movably connected to the annular fixed track 501, an annular gear 503 fixedly connected to the inner surface of the limiting swivel 502, a plurality of screws 504 movably connected to the annular fixed track 501 and a driven gear 505 fixedly connected to the screw 504, the plurality of screws 504 are respectively threadedly connected to the corresponding elastic telescopic pumping mechanism 6, and the plurality of driven gears 505 are all engaged with the annular gear 503.

[0028] It should be noted that, as described above, when the elastic telescopic air pumping mechanism 6 is driven to continuously perform air pumping work by the adjustment mechanism 5, the limiting swivel 502 is rotated so that the limiting swivel 502 drives the ring gear 503 connected thereto to rotate in the same direction and at the same angle. During the rotation process, the ring gear 503 can synchronously drive a plurality of driven gears 505 to rotate in the same direction and at the same angle. In 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, the elastic telescopic air pumping mechanism 6 can be driven to extend or shorten. Similarly, the reverse rotation can drive the elastic telescopic air pumping mechanism 6 to shorten or extend, thereby realizing a reciprocating air pumping action. In one embodiment of the present invention, the screw 504 can also be a reciprocating screw. If a reciprocating screw is used, there is no need to control the forward and reverse rotation of the limit ring 502, but a slider that cooperates with the reciprocating screw needs to be provided on the elastic telescopic pumping mechanism 6.

[0029] In an optional embodiment of the present invention, Figure 3-Figure 8 As shown, the elastic telescopic pump air mechanism 6 includes a spring 2 601 and a square sleeve 602 fixedly connected to the reducing sleeve 401, a piston member 603 slidably connected to the inside of the square sleeve 602, a hollow connecting pipe 604 fixedly connected to the piston member 603, a slot 6020 provided on the square sleeve 602, a partition 6021 fixedly connected to the inner wall of the slot 6020, a plurality of air vents 6022 provided 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 air vents 6022. The other end of the spring 2 601 is fixedly connected to the annular fixed track 501, and the hollow connecting pipe 604 is threadedly connected to the screw 504.

[0030] It should be noted that, as mentioned above, when the elastic telescopic pumping mechanism 6 is driven to reciprocate and retract and perform the pumping action through the adjustment mechanism 5, the hollow connecting tube 604 threadedly connected to the screw 504 begins to reciprocate and drives the piston 603 connected thereto to reciprocate in 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 the action of this negative pressure, the plastic sealing sheet 6023 is stressed and bends toward the inside of the square sleeve 602, and a number of vent holes 6022 are in a conducting state. In this state, outside air can enter the square sleeve 602 under the action of negative pressure, and the sealing plate 1 tightly blocks the channel on the ring plate 1, thereby pumping outside air into the square sleeve 602. As the piston 603 approaches the reducing sleeve 401, a positive pressure is formed inside the square sleeve 602. At this time, the plastic sealing sheet 6023 tightly seals several air holes 6022 under the action of pressure, and the sealing plate 1 is pushed open. At this time, air can be pumped into the annular capsule 403, and with the reciprocating movement of the hollow connecting tube 604, an uninterrupted pumping effect is achieved.

[0031] In an optional embodiment of the present invention, Figure 3 and Figure 7As shown, a second ventilation cavity 406 is provided inside the reducing sleeve 401, and a second one-way valve 407 is provided inside the second ventilation cavity 406. One end of the second ventilation cavity 406 is communicated with the area of ​​the ventilation cavity 1 404 between the ring plate 1 and the square sleeve 602, and the other end is communicated with the sealed chamber formed between the fixed pipe 301, the telescopic bellows 1 302, the telescopic bellows 2 303 and the reducing sleeve 401. The second one-way valve 407 is used to limit the gas in the square sleeve 602 from flowing into the sealed chamber formed between the fixed pipe 301, the telescopic bellows 1 302, the telescopic bellows 2 303 and the reducing sleeve 401 in one direction.

[0032] The one-way valve 2 407 includes a ring plate 3 fixedly connected to the inner wall of the ventilation channel 2 406, a ring plate 4, 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 2 406, 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 axial contact pressure between the pipeline sleeve mechanism 4 and the old pipe, and to improve the radial stability of the telescopic bellows 2 303, and to prevent the water pressure from being too high and causing the telescopic bellows 2 303 to deform toward the telescopic bellows 1 302, thereby causing the water flow data to deviate, while pumping gas into the annular capsule 403, the gas can flow through the ventilation cavity 2 406, and under the action of the one-way valve 2 407, the gas can only be pumped in one direction into the sealed chamber formed between the fixed pipe 301, the telescopic bellows 1 302, the telescopic bellows 2 303 and the reducing sleeve 401, so that there is sufficient pressure outside the telescopic bellows 1 302 to offset the water pressure, thereby keeping the flow in a stable state, and allowing the reducing sleeve 401 to press against the cut end of the old pipe at a set pressure, thereby achieving stable contact and sealing effects, and ultimately making the entire electromagnetic water meter and the old pipe stably form an integrated structure.

[0034] The above describes this embodiment, but this embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms based on the inspiration of this embodiment, all of which are protected by this embodiment.

Claims

1. An electromagnetic water meter, characterized in that: include: A main pipeline (1), wherein a measuring module (2) is connected to the main pipeline (1), and the measuring module (2) is used to obtain water flow data passing through the main pipeline (1); Two sets of pipeline adapter mechanisms (3), the two sets of pipeline adapter mechanisms (3) are respectively connected to the two ends of the main pipeline (1), the other ends of the pipeline adapter mechanisms (3) are connected to the pipeline sleeve mechanism (4), and the pipeline adapter mechanisms (3) are used to form a sealed pipeline with adjustable length between the main pipeline (1) and the pipeline sleeve mechanism (4); Two groups of regulating mechanisms (5), the two groups of regulating mechanisms (5) being respectively connected to corresponding pipeline adapting mechanisms (3); A plurality of sets of elastic telescopic air pumping mechanisms (6), wherein the plurality of sets of the elastic telescopic air pumping mechanisms (6) are respectively connected between the pipeline sleeve mechanism (4) and the corresponding adjustment mechanism (5), and the plurality of sets of the elastic telescopic air pumping mechanisms (6) are used to restrict the main pipeline (1), the pipeline adapter mechanism (3) and the pipeline sleeve mechanism (4) to be in a coaxial state; The pipeline sleeve mechanism (4) includes a reducing sleeve assembly and an annular expansion pressure assembly connected to the reducing sleeve assembly. The elastic telescopic air pumping mechanism (6) is used to apply axial pressure to the reducing sleeve assembly, and the elastic telescopic air pumping mechanism (6) is connected to the annular expansion pressure assembly. The regulating mechanism (5) is used to drive the elastic telescopic air pumping mechanism (6) to pump air into the annular expansion pressure assembly, and the annular expansion pressure assembly is used to apply radial pressure to the outer wall of the old pipeline.

2. An electromagnetic water meter according to claim 1, characterized in that: The pipeline adapting mechanism (3) comprises a fixed pipeline (301), a telescopic bellows 1 (302) and a telescopic bellows 2 (303) connected to the other end of the fixed pipeline (301), wherein the fixed pipeline (301), the telescopic bellows 1 (302) and the telescopic bellows 2 (303) are all coaxially arranged, the telescopic bellows 2 (303) is arranged outside the telescopic bellows 1 (302), and one end of the fixed pipeline (301) is fixedly connected to the input end or the output end of the main pipeline (1).

3. An electromagnetic water meter according to claim 2, characterized in that: The reducing sleeve assembly comprises a reducing sleeve (401) and a sealing gasket (402) connected to the inner wall of the reducing sleeve (401), wherein the sealing gasket (402) is used to contact the old pipe along the axial direction of the reducing sleeve (401), and the other ends of the telescopic bellows 1 (302) and the telescopic bellows 2 (303) are both fixedly connected to the reducing sleeve (401).

4. An electromagnetic water meter according to claim 3, characterized in that: The annular expansion and pressure-applying assembly comprises an annular sac (403) connected to the inner wall of the reducing sleeve (401), a ventilation cavity (404) provided inside the reducing sleeve (401), and a one-way valve (405) provided inside the ventilation cavity (404). The internal space of the elastic telescopic pumping mechanism (6) is connected to the annular sac (403) through the ventilation cavity (404). The one-way valve (405) is used to limit the gas in the elastic telescopic pumping mechanism (6) from flowing into the annular sac (403) in one direction. The annular sac (403) is used to contact the old pipe 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 1 (405) includes a ring plate 1 fixedly connected to the inner wall of the one-way valve 1 (405), a ring plate 2, 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 1 (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 regulating mechanism (5) comprises 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 surface of the limiting rotating ring (502), a plurality of screw rods (504) movably connected to the annular fixed track (501), and a driven gear (505) fixedly connected to the screw rods (504), wherein the plurality of screw rods (504) are respectively threadedly connected to corresponding elastic telescopic pumping mechanisms (6), and the plurality of driven gears (505) are all meshed with the annular gear (503).

7. An electromagnetic water meter according to claim 6, characterized in that: The elastic telescopic pumping mechanism (6) comprises a spring 2 (601) and a square sleeve (602) fixedly connected to the reducing sleeve (401), a piston (603) slidably connected to the inside of the square sleeve (602), a hollow connecting pipe (604) fixedly connected to the piston (603), a notch (6020) provided on the square sleeve (602), a partition (6021) fixedly connected to the inner wall of the notch (6020), and a plurality of vent holes (6021) provided on the partition (6021). 022) 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 a plurality of vent holes (6022), the other end of the spring 2 (601) is fixedly connected to the annular fixed track (501), and the hollow connecting pipe (604) is threadedly connected to the screw (504).

8. An electromagnetic water meter according to claim 7, characterized in that: A second ventilation cavity (406) is provided inside the reducing sleeve (401), and a second one-way valve (407) is provided inside the second ventilation cavity (406). One end of the second ventilation cavity (406) is communicated with the area of ​​the first ventilation cavity (404) between the ring plate 1 and the square sleeve (602), and the other end is communicated with the sealed chamber formed between the fixed pipe (301), the telescopic bellows 1 (302), the second telescopic bellows (303) and the reducing sleeve (401). The second one-way valve (407) is used to limit the gas in the square sleeve (602) from flowing in one direction into the sealed chamber formed between the fixed pipe (301), the telescopic bellows 1 (302), the second telescopic bellows (303) and the reducing sleeve (401).

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

10. A continuous sampling method for an electromagnetic water meter, characterized in that: Using an electromagnetic water meter according to any one of claims 1 to 9, comprising the following steps: Step 100: Close the valves at both ends of the old pipe and cut a set area on the old pipe to form a blank cutting section of a set length on the old pipe; Step 200: Sleeve one of the pipe sleeve mechanisms (4) onto one of the notched ends of the old pipe, squeeze the other pipe sleeve mechanism (4) and shorten both pipe adapter mechanisms (3) until the distance between the two pipe sleeve mechanisms (4) is less than the length of the cut blank section, and then sleeve the other pipe sleeve mechanism (4) onto the other notched end of the old pipe; Step 300: The regulating mechanism (5) drives a plurality of elastic and telescopic pumping mechanisms (6) to continuously pump air into the annular expansion and pressure-applying component until the air pressure in the annular expansion and pressure-applying component reaches a set pressure; Step 400: Open the valves at both ends of the old pipeline and obtain the water flow data flowing through the main pipeline (1) through the measurement module (2).

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