An adjustable-diameter electromagnetic flowmeter

Abstract

This invention relates to an adjustable-diameter electromagnetic flowmeter, comprising a housing, moving modules, and a pushing unit. The housing houses the moving modules and the pushing unit. Each moving module has an isosceles right-angled triangle cross-section. Four moving modules are arranged in a circular array, forming a closed square channel. The right-angled sides of the four moving modules are paired and opposite each other in the vertical and horizontal directions. One side of each moving module's right-angled cross-section is adjacent to the other side of its adjacent right-angled cross-section. The four moving modules are slidably connected to the housing along the length of the hypotenuse of their cross-sections. Both ends of each moving module are fitted to the inner walls of the housing. By employing this technical solution, when using the adjustable-diameter electromagnetic flowmeter of this invention to monitor rainwater pipes, the flowmeter can achieve more accurate measurements to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of fluid measurement technology, and more specifically to an electromagnetic flowmeter with adjustable diameter. Background Technology

[0002] A flow meter is an instrument that measures the flow rate and / or the total volume of fluid within a selected time interval; that is, it is used to measure the flow rate of fluid in pipes or open channels. Flow meters are classified into differential pressure flow meters, rotor flow meters, throttling flow meters, slot flow meters, volumetric flow meters, electromagnetic flow meters, ultrasonic flow meters, etc.

[0003] Electromagnetic flowmeters are instruments that measure the flow rate of conductive fluids based on the electromotive force induced when the fluid passes through an external magnetic field. Their measurement accuracy is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity. The sensor's induced voltage signal has a linear relationship with the average flow velocity, resulting in high measurement accuracy. They are commonly used in rainwater pipes for monitoring rainwater collection and treatment.

[0004] However, in the use of electromagnetic flowmeters, if the liquid in the rainwater pipe has a high content of air bubbles or solid particles, it will interfere with the electrode signal, causing measurement errors. Furthermore, when the liquid in the pipe is not flowing completely (such as during low-level drainage), data jumps are likely to occur, affecting the monitoring accuracy of the flowmeter. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an adjustable-diameter electromagnetic flow meter to solve the problems in the use of existing electromagnetic flow meters, such as the interference of electrode signals and measurement errors caused by excessively high content of air bubbles or solid particles in the liquid in the rainwater pipe; and the easy occurrence of data jumps when the liquid in the pipe is not flowing at full capacity (such as low water level drainage), which affects the monitoring accuracy of the flow meter.

[0006] This invention is achieved through the following technical solution:

[0007] An adjustable-diameter electromagnetic flowmeter includes a magnetic circuit system, electrodes, and a controller. The magnetic circuit system generates a uniform alternating magnetic field. The electrodes monitor the induced electromotive force signal generated when fluid cuts magnetic field lines. The controller processes the electrical signal monitored by the electrodes. The flowmeter also includes a housing, moving modules, a pushing unit, a centrifugal mechanism, and a filter unit. The housing houses the moving modules and the pushing unit. Each moving module has an isosceles right-angled triangle cross-section. Four moving modules are arranged in a circular array, forming a closed square channel. The right-angled sides of the four moving modules... The four moving modules are arranged in pairs, facing each other vertically and horizontally. One side of the right-angled side of the cross-section of each of the four moving modules is attached to the other side of the right-angled side of the cross-section of the adjacent moving module. The four moving modules are slidably connected to the housing along the length of the hypotenuse of the cross-section of the moving modules. Both ends of the four moving modules are attached to the inner walls of both ends of the housing. The centrifugal mechanism is located in a closed square channel formed by the four moving modules. The centrifugal mechanism is fixed to the rainwater pipe. The rotation center of the centrifugal mechanism is located on the rotation center line of the four moving modules. The filter part is located on the side wall of the square channel.

[0008] The pushing part is used to simultaneously push the adjacent side of the right-angled side of the cross section of the four moving modules to slide against each other with the other side of the right-angled side of the cross section of the adjacent moving module; the magnetic circuit system includes two coils, which are respectively connected to the right-angled side of the cross section of two opposite moving modules in the vertical direction; and there are two electrodes, which are respectively connected to the right-angled side of the cross section of two opposite moving modules in the horizontal direction.

[0009] The centrifugal mechanism includes a rotating part, fan blades, a second motor, and an adjustment mechanism. The rotating part is arranged along the center line of a square channel. There are multiple fan blades arranged in a circular array with the rotating part as the center line of rotation. The fan blades are hinged to the rotating part. The second motor is connected to a rainwater pipe. The rotating part is connected to the output shaft of the second motor. The adjustment mechanism is used to adjust the opening and closing of the fan blades when the pushing part simultaneously pushes the adjacent side of the right-angled side of the cross-section of the four moving modules to slide against each other.

[0010] Furthermore, the pushing unit includes a rack, a third gear, an internal gear ring, and a first motor. The rack is fixed to the side of the inclined side of the moving module cross-section and is arranged along the length direction of the inclined side of the moving module cross-section. The third gear is rotatably connected to the housing and meshes with the rack. The internal gear ring is rotatably connected to the housing and meshes with the third gear. The output end of the first motor is connected to any of the third gears, and the first motor is electrically connected to the controller.

[0011] Furthermore, the bottom of the rainwater pipe is flush with the lowest edge of the smallest square channel, and a water level gauge is connected to the uppermost edge of the square channel. The water level gauge is electrically connected to the controller.

[0012] Furthermore, the filtration unit includes a filter screen, the centrifugal mechanism is located at one end of the square channel inlet, the side of the movable module section where the inclined side is located is recessed inward to form a receiving groove, the filter screen is fitted and installed on the edge of the receiving groove facing the center line of the channel, and the end of the filter screen facing the centrifugal mechanism is provided with an opening.

[0013] Furthermore, the adjustment structure includes a threaded rod, a threaded sleeve, a first sleeve, a connecting rod, and a driving part. The threaded rod is rotatably connected to the rotating part, the threaded sleeve is threadedly connected to the threaded rod, the threaded sleeve is slidably connected to the square channel, and the threaded sleeve is rotatably fitted inside the first sleeve. Multiple connecting rods are provided, and each connecting rod is connected to a corresponding centrifugal mechanism. The two ends of each connecting rod are respectively hinged to the middle of the centrifugal mechanism and the outer peripheral wall of the first sleeve. The driving part is used to drive the threaded rod to rotate.

[0014] Furthermore, the drive unit includes a first bevel gear, a second bevel gear, a connecting rod, a third bevel gear, and a fourth bevel gear. The first motor is a dual-axis motor, and the output shafts at both ends of the dual-axis motor are respectively connected to any one of the gears and the first bevel gear. The second bevel gear meshes with the first bevel gear. The second bevel gear, the third bevel gear, and the connecting rod are arranged coaxially. The connecting rod passes through the inner wall of the rainwater pipe, and its two ends are respectively connected to the second bevel gear and the third bevel gear. The fourth bevel gear meshes with the third bevel gear and is connected to one end of the threaded rod.

[0015] The rotating part includes a second sleeve, a first gear, and a second gear. The first sleeve is sleeved on the threaded rod. The end of the second sleeve away from the first sleeve is connected to the first gear. The output shaft of the second motor is connected to the second gear. The first gear and the second gear mesh.

[0016] The beneficial effects of this invention are as follows:

[0017] When using an adjustable-diameter electromagnetic flowmeter of the present invention to monitor rainwater pipes, if the rainwater pipe is not full, the cross-sectional area monitored by the flowmeter can be adjusted to adapt to the water flow, so that the water flow can form a full pipe state in the square channel when passing through the flowmeter, thereby enabling the electromagnetic flowmeter to measure more accurately to a certain extent; during monitoring, impurities in the rainwater can be centrifuged and filtered, which improves the accuracy of electromagnetic flowmeter monitoring to a certain extent.

[0018] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the present invention from another angle;

[0021] Figure 3 This is a cross-sectional view of the structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the centrifuge mechanism of the present invention;

[0023] Figure 5 For the present invention Figure 4 A magnified view of part A in the image.

[0024] In the diagram: 1. Controller; 2. Housing; 3. Moving module; 4. Pushing part; 41. Rack; 42. Third gear; 43. Internal gear ring; 44. First motor; 5. Centrifugal mechanism; 51. Rotating part; 511. Second sleeve; 512. First gear; 513. Second gear; 52. Fan blade; 53. Second motor; 54. Adjusting mechanism; 541. Threaded rod; 542. Threaded sleeve; 543. First sleeve; 544. Connecting rod; 545. Drive part; 5451. First bevel gear; 5452. Second bevel gear; 5453. Third bevel gear; 5454. Fourth bevel gear; 5455. Connecting rod; 55. Telescopic rod; 56. Slide rod; 57. Rotating block; 6. Filter screen; 7. Rainwater pipe. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0026] Please see Figure 1-5This invention provides a technical solution for an adjustable-diameter electromagnetic flowmeter: It includes a magnetic circuit system, electrodes, and a controller 1. The magnetic circuit system generates a uniform alternating magnetic field. The electrodes monitor the induced electromotive force signal generated by the fluid cutting magnetic field lines. The controller 1 processes the electrical signal monitored by the electrodes. The invention is characterized by further including a housing 2, a moving module 3, a pushing part 4, a centrifugal mechanism 5, and a filtering part. The housing 2 accommodates the moving module 3 and the pushing part 4. The moving module 3 has an isosceles right-angled triangle cross-section. There are four moving modules 3 arranged in a circular array, forming a closed square channel. The right-angled sides of the four moving modules 3 are opposite each other in the vertical and horizontal directions. The side of each of the four moving modules 3 is attached to the side of the right-angled side of the cross section of the adjacent moving module 3. The four moving modules 3 are slidably connected to the housing 2 along the length of the hypotenuse of the cross section of the moving module 3. Both ends of the four moving modules 3 are attached to the inner walls of both ends of the housing 2. The centrifugal mechanism 5 is located in the square channel formed by the four moving modules 3. The centrifugal mechanism 5 is fixed to the rainwater pipe. The rotation center of the centrifugal mechanism 5 is located on the rotation center line of the four moving modules 3. The filter part is located on the side wall of the square channel.

[0027] The pushing part 4 is used to simultaneously push the adjacent side of the right-angled cross-section of the four moving modules 3 to slide against each other; the magnetic circuit system includes two coils, which are respectively connected to the right-angled cross-section of two opposite moving modules 3 in the vertical direction; there are two electrodes, which are respectively connected to the right-angled cross-section of two opposite moving modules 3 in the horizontal direction.

[0028] The centrifugal mechanism 5 includes a rotating part 51, fan blades 52, a second motor 53, and an adjusting mechanism 54. The rotating part 51 is arranged along the center line of the square channel. There are multiple fan blades 52 arranged in a circular array with the rotating part 51 as the center line of rotation. The fan blades 52 are hinged to the rotating part 51. The second motor 53 is connected to the rainwater pipe. The rotating part 51 is connected to the output shaft of the second motor 53. The adjusting mechanism 54 is used to adjust the opening and closing of the fan blades 52 when the pushing part 4 simultaneously pushes the adjacent side of the right-angled side of the cross section of the four moving modules 3 to slide against each other.

[0029] When using the adjustable-diameter electromagnetic flowmeter of the present invention to monitor the rainwater pipe 7, the adjustable-diameter electromagnetic flowmeter of the present invention is first installed between the interfaces of the two rainwater pipes 7. Specifically, the adjustable-diameter electromagnetic flowmeter of the present invention can be fixedly installed by bolt connection.

[0030] When an adjustable-diameter electromagnetic flowmeter of the present invention monitors a rainwater pipe 7, four moving modules 3 form a closed square channel. The adjacent side of the right-angled cross-section of each of the four moving modules 3 is in contact with the adjacent side of the right-angled cross-section of their respective moving modules 3. The side length of the square channel is the length of the side of the right-angled cross-section of each moving module 3 minus the length of the side of the right-angled cross-section of its adjacent moving module 3 that is in contact with it. By pushing the moving modules 3 along the length of their right-angled cross-sections using the pushing part 4, the side length of the square channel can change. Since the pushing part 4 is used to simultaneously push the adjacent side of the right-angled cross-section of each of the four moving modules 3 to slide against each other, when one moving module 3 moves, the other moving modules 3 also move simultaneously. This causes the four moving modules 3 to move towards or away from the rotation center line simultaneously, leading to the four moving modules 3 moving closer or further apart from each other, thus changing the side length of the square channel and the cross-sectional area of ​​the water flowing through it.

[0031] Since the right-angled sides of the four moving modules 3 are opposite each other in the vertical and horizontal directions, and since the two coils are respectively connected to the right-angled sides of the cross sections of the two opposite moving modules 3 in the vertical direction, and the two electrodes are respectively connected to the right-angled sides of the cross sections of the two opposite moving modules 3 in the horizontal direction, the mutual sliding between the four moving modules 3 will not affect the use of the coils and electrodes. The coils can still form a uniform alternating magnetic field in the vertical direction, and the electrodes can still be used to monitor the induced electromotive force signal induced by the fluid cutting magnetic field lines.

[0032] With this structure, when using an adjustable-diameter electromagnetic flowmeter of the present invention to monitor rainwater pipe 7, if the rainwater pipe 7 is not full, the cross-sectional area monitored by the flowmeter can be adjusted to adapt to the water flow, so that the water flow can form a full pipe state in the square channel when passing through the flowmeter, thereby enabling the electromagnetic flowmeter to measure more accurately to a certain extent.

[0033] Specifically, the inclined edge of the moving module 3 is provided with a sealing strip. The sealing strip abuts against the side adjacent to the right angle side, which can prevent water from flowing out from the gap at the joint of the two sides corresponding to the right angle side of the moving module 3 to a certain extent.

[0034] After the water flows through the rainwater pipe 7 to the square channel, the centrifugal mechanism 5 separates the water flow and impurities in the water flow by centrifugal force. The impurities in the water flow flow along the side wall of the square channel due to centrifugal force and are intercepted by the filter section. This structure can reduce the interference of water flow impurities on the electromagnetic flowmeter's measuring structure to a certain extent, and make the measurement results more accurate to a certain extent. By adjusting the opening and closing of the fan blades 52, the centrifugal mechanism 5 can be adapted to square channels of different sizes. Thus, even when the cross-sectional area of ​​the square channel becomes smaller, the centrifugal mechanism 5 can still separate impurities in the incoming water flow.

[0035] In this embodiment: the pushing unit 4 includes a rack 41, a third gear 42, an internal gear ring 43, and a first motor 44. The rack 41 is fixed to the side of the inclined side of the cross section of the moving module 3. The rack 41 is arranged along the length direction of the inclined side of the cross section of the moving module 3. The third gear 42 is rotatably connected to the housing 2 and meshes with the rack 41. The internal gear ring 43 is rotatably connected to the housing 2 and meshes with the third gear 42. The output end of the first motor 44 is connected to any of the third gears 42. The first motor 44 is electrically connected to the controller 1.

[0036] When the water flow in the rainwater pipe 7 is small and cannot fill the square channel of the flow meter, the controller 1 controls the first motor 44 to run, thereby driving the motor to rotate the third gear 42. Since the third gear 42 meshes with the rack 41 and the internal gear ring 43 respectively, the rotation of the third gear 42 will drive the internal gear ring 43 to rotate and drive the rack 41 to move. Since the rack 41 is fixed to the side of the inclined side of the cross section of the moving module 3, the four moving modules 3 are slidably connected to the housing 2 along the length of the inclined side of the cross section of the moving module 3. The rotation of the third gear 42 can simultaneously push the adjacent side of the right angle side of the cross section of the four moving modules 3 to slide against each other. With this structure, the pushing part 4 can simultaneously push the adjacent side of the right angle side of the cross section of the four moving modules 3 to slide against each other.

[0037] In this embodiment: the bottom of the rainwater pipe 7 is flush with the lowest edge of the smallest square channel, and a water level gauge is connected to the uppermost edge of the square channel. The water level gauge is electrically connected to the controller 1.

[0038] Since the hypotenuses of the two opposite sections of the moving module 3 are vertically arranged, when the four moving modules 3 move closer or further away from each other, the right-angled side of one of the moving modules 3 will always be at the top. Since the uppermost edge of the square channel is connected to a water level gauge, which is connected to the right-angled edge of the uppermost moving module 3, with this structure, the water level gauge does not need to be installed on the right-angled surface of the moving module 3, and the mutual sliding of the moving modules 3 will not affect the water level gauge.

[0039] Since the bottom of the rainwater pipe 7 is flush with the lowest edge of the smallest square channel, the rainwater in the rainwater pipe 7 can flow more smoothly into the square channel, which makes it easier for the adjustable flow meter of the present invention to monitor the rainwater flow.

[0040] When rainwater enters the square orifice of the flow meter through the rainwater pipe 7, if the water level gauge cannot sense the water flow, it sends an electrical signal to the controller 1, causing the controller 1 to control the first motor 44 to rotate, making the four moving modules 3 move closer to each other, thereby reducing the cross-sectional area of ​​the square orifice to match the rainwater volume; when the rainwater enters the square orifice of the flow meter through the rainwater pipe 7 too much, the water level gauge is under excessive pressure and sends an electrical signal to the controller 1, causing the controller 1 to control the first motor 44 to rotate, making the four moving modules 3 move further apart, thereby increasing the cross-sectional area of ​​the square orifice to match the rainwater volume.

[0041] In this embodiment: the filtration section includes a filter screen 6, the centrifugal mechanism 5 is located at one end of the square channel inlet, the side of the movable module 3 with its inclined side recessed inward to form a receiving groove, the filter screen 6 is fitted and installed on the edge of the receiving groove facing the center line of the channel, and the end of the filter screen 6 facing the centrifugal mechanism 5 has an opening.

[0042] After the water flows through the pipe to the square channel, the centrifugal mechanism 5 separates the water flow and impurities in the water flow. Because the mass of the impurities in the water flow is greater than that of the water, they flow along the inner wall of the square channel during the separation process of the centrifugal mechanism 5. Since the side of the inclined side of the moving module 3 is recessed inward to form a receiving groove, the filter screen 6 is installed at the edge of the receiving groove facing the center line of the channel. The end of the filter screen 6 facing the centrifugal mechanism 5 has an opening. The impurities will enter the receiving groove under the centrifugal action and remain in the receiving groove after being filtered by the filter screen 6. With this structure, impurities in the rainwater can be cleaned to a certain extent, reducing the impact of impurities on the monitoring results of the meter to a certain extent.

[0043] In this embodiment: the adjustment structure includes a threaded rod 541, a threaded sleeve, a first sleeve 542, a threaded sleeve 543, a connecting rod 544, and a driving part 545. The threaded rod 541 is rotatably connected to the rotating part 51. The threaded sleeve is threadedly connected to the threaded rod 541. The threaded sleeve is slidably connected to the square channel. The threaded sleeve is rotatably fitted to the first sleeve 542. Inside 543, there are multiple connecting rods 544, which are connected one-to-one with multiple centrifugal mechanisms 5. The two ends of the connecting rods 544 are respectively hinged to the middle part of the centrifugal mechanism 5 and the first sleeve 542. On the outer peripheral wall of 543, the driving part 545 is used to drive the threaded rod 541 to rotate.

[0044] Since the threaded rod 541 is rotatably connected to the rotating part 51, and the threaded sleeve is rotatably fitted into the first sleeve 542 threaded sleeve 543, and since the threaded sleeve is slidably connected to the square channel, when the driving part 545 drives the threaded rod 541 to rotate, only the threaded sleeve moves along the length direction of the threaded rod 541 under its rotation, thereby driving the first sleeve 542 threaded sleeve 543 to rotate along the threaded rod 541, thereby causing the fan blade 52 to open or close. With this structure, the adjusting mechanism 54 can be used to adjust the opening and closing of the fan blade 52.

[0045] Specifically, it also includes a rotating block 57, a telescopic rod 55, and a sliding rod 56. The threaded rod 541 is rotatably connected to the rotating block 57. The two ends of the telescopic rod 55 are respectively connected to the right-angled side of the moving module 3 and the rotating block 57. The sliding rod 56 is arranged along the length direction of the threaded rod 541. One end of the sliding rod 56 is fixed to the rotating block 57. The threaded sleeve is slidably connected to the sliding rod 56. With this structure, the threaded sleeve can be rotatably connected to the square channel.

[0046] In this embodiment: the drive unit 545 includes a first bevel gear 5451, a second bevel gear 5452, a connecting rod 5455, a third bevel gear 5453, and a fourth bevel gear 5454. The first motor 44 is a dual-axis motor. The output shafts at both ends of the dual-axis motor are respectively connected to any one of the gears and the first bevel gear 5451. The second bevel gear 5452 meshes with the first bevel gear 5451. The second bevel gear 5452, the third bevel gear 5453, and the connecting rod 5455 are arranged coaxially. The connecting rod 5455 passes through the inner wall of the rainwater pipe 7. The two ends of the connecting rod 5455 are respectively connected to the second bevel gear 5452 and the third bevel gear 5453. The fourth bevel gear 5454 meshes with the third bevel gear 5453. The fourth bevel gear 5454 is connected to one end of the threaded rod 541.

[0047] The rotating part 51 includes a second sleeve 511, a first gear 512 and a second gear 513. The first sleeve 542 is a threaded sleeve. 543 is sleeved on the threaded rod 541. The second sleeve 511 is away from the first sleeve 542. One end of 543 is connected to the first gear 512. The output shaft of the second motor 53 is connected to the second gear 513. The first gear 512 and the second gear 513 mesh.

[0048] The rotation of the first motor 44 drives the first bevel gear 5451 to rotate, which in turn drives the second bevel gear 5452, the third bevel gear 5453, and the fourth bevel gear 5454 to rotate. That is, the rotation of the first motor 44 can drive the threaded rod 541 to rotate, thereby adjusting the opening and closing of the fan blade 52. Since the rotating part 51 includes a second sleeve 511, a first gear 512, and a second gear 513, the first sleeve 542 is a threaded sleeve; 543 is sleeved on the threaded rod 541, and the second sleeve 511 is away from the first sleeve 542; one end of 543 is connected to the first gear 512, and the output shaft of the second motor 53 is connected to the second gear 513. The first gear 512 and the second gear 513 mesh. The rotation of the fan blade 52 will not affect the rotation of the threaded rod 541. With this structure, when the water level gauge senses the water level and the controller 1 controls the first motor 44 to rotate, the cross-sectional area of ​​the square channel changes, and at the same time, the fan blade 52 opens and closes to adapt to the cross-sectional area of ​​the square channel.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A flow meter of adjustable bore comprising a magnetic circuit system for generating a uniform alternating magnetic field, electrodes for monitoring the induced potential signal induced by the fluid cutting the magnetic field lines, and a controller for processing the electrical signal monitored by the electrodes; characterized in that: Also include the shell, mobile module, push part, centrifugal mechanism and filter part, the shell is used for containing the mobile module and push part, the mobile module section is isosceles right triangle, the mobile module is four, four mobile module annular array arrangement, four mobile module encloses closed square channel, four mobile module right angle edge respectively in vertical direction and horizontal direction two two positive opposite, four the mobile module section right angle edge adjacent side and its adjacent mobile module section right angle edge adjacent other side fit, four mobile module with the slide type connection shell along mobile module section bevel edge length direction, four mobile module both ends are with the shell both ends inner wall fit, the centrifugal mechanism is located in four mobile module encloses closed square channel, the centrifugal mechanism is fixed on rainwater pipeline, the rotation center of the centrifugal mechanism is located on the center line of square channel, the filter part is located on the side wall of the square channel; The push part is used to simultaneously push four mobile module section right angle edge adjacent side and its adjacent mobile module section right angle edge adjacent other side each other sliding;The magnetic circuit system includes two coils, two coils are connected to the section right angle edge of two opposite mobile modules in vertical direction, the electrode has two, two electrodes are connected to the section right angle edge of two opposite mobile modules in horizontal direction; The centrifugal mechanism includes a rotating part, a fan blade, a second motor and an adjusting mechanism, the rotating part is arranged along the center line of the square channel, the fan blade is a plurality of, the plurality of fan blades are arranged in a circular array with the rotating part as the rotation center line, the fan blade is hinged to the rotating part, the second motor is connected to the rainwater pipeline, the rotating part is connected to the output shaft of the second motor, and the adjusting mechanism is used to adjust the opening and closing of the fan blade when the push part simultaneously pushes four mobile module section right angle edge adjacent side and its adjacent mobile module section right angle edge adjacent other side each other sliding.

2. A flow meter according to claim 1, wherein: The push part includes a rack, a third gear, an inner tooth ring and a first motor, the rack is fixed to the side of the bevel edge of the mobile module section, the rack is arranged along the length direction of the bevel edge of the mobile module section, the third gear is rotatably connected to the shell, the third gear is engaged with the rack, the inner tooth ring is rotatably connected to the shell, the inner tooth ring is engaged with the third gear, and the output end of the first motor is connected to any third gear. The first motor is electrically connected with the controller.

3. A flow meter according to claim 2, wherein: The bottom of the rainwater pipeline is flush with the lowest edge of the smallest square channel, the uppermost edge of the square channel is connected with a water level gauge, and the water level gauge is electrically connected with the controller.

4. A flow meter according to claim 3, wherein: The filter part includes a filter screen, the centrifugal mechanism is located at one end of the water inlet of the square channel, the side of the bevel edge of the mobile module section is recessed to form a containing groove, the filter screen is installed on the edge of the containing groove facing the center line of the channel, and the end of the filter screen facing the centrifugal mechanism is provided with an opening.

5. A flow meter according to claim 4, wherein: The adjusting structure comprises a threaded rod, a threaded sleeve, a first sleeve, connecting rods and a driving part, the threaded rod is rotatably connected with the rotating part, the threaded sleeve is threadedly connected with the threaded rod, the threaded sleeve is slidably connected with the square channel, the threaded sleeve is rotatably matched in the first sleeve, the connecting rods are provided in plurality, the plurality of connecting rods are connected with the plurality of centrifugal mechanisms one by one, and two ends of the connecting rod are respectively hinged to the middle of the centrifugal mechanism and the outer peripheral wall of the first sleeve.

6. A flow meter according to claim 5, wherein: The driving part comprises a first bevel gear, a second bevel gear, a connecting rod, a third bevel gear and a fourth bevel gear, the first motor is a double-shaft motor, the output shafts at two ends of the double-shaft motor are respectively connected with any gear and the first bevel gear, the second bevel gear is engaged with the first bevel gear, the second bevel gear, the third bevel gear and the connecting rod are coaxially arranged, the connecting rod passes through the inner wall of the rainwater pipe, two ends of the connecting rod are respectively connected with the second bevel gear and the third bevel gear, the fourth bevel gear is engaged with the third bevel gear, and one end of the fourth bevel gear is connected with the threaded rod. The rotating part comprises a second sleeve, a first gear and a second gear, the first sleeve is sleeved on the threaded rod, one end of the second sleeve away from the first sleeve is connected with the first gear, the output shaft of the second motor is connected with the second gear, and the first gear and the second gear are engaged.

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