Flowmeter for sewage pipeline

Abstract

The invention relates to a flow meter for a sewage pipeline, the flow meter comprises a metering chamber, a magnetic circuit system, an electrode and a controller, the electrode comprises two pole pieces and an insulating piece connected between the two pole pieces, the two pole pieces are enclosed to form a cylinder, the central axis of the cylinder formed by the two pole pieces is arranged perpendicular to the flow direction of sewage, and the insulating piece is arranged between the two pole pieces. The two pole pieces are rotatably connected with the inner wall of the metering chamber, and any one pole piece protrudes out of the inner wall of the metering chamber and is in contact with sewage; the device further comprises a conductive contact, a rotating part and a cleaning part, the conductive contact is connected with one pole piece protruding out of the inner wall of the metering chamber, the conductive contact is electrically connected with the controller, the rotating part is used for driving the two electrodes to rotate, and the cleaning part is used for cleaning one pole piece not protruding out of the inner wall of the metering chamber. Due to the adoption of the technical scheme, when the flow meter for the sewage pipeline is used for metering the sewage pipeline, the possibility that the electrodes are covered by impurities, so that the measurement precision is influenced is reduced.

Description

Technical Field

[0001] This invention relates to the field of fluid measurement technology, and more specifically to a flow meter for sewage pipelines. Background Technology

[0002] Urban sewage refers to domestic sewage from urban residents, as well as drainage from public facilities, permitted industrial wastewater, and initial rainwater. my country has established a tiered discharge standard system for urban sewage treatment, and at the policy level, it implements a drainage permit system, classifying and regulating industrial, medical, and other wastewater dischargers, and requiring pretreatment facilities to operate in compliance with standards. A flow meter is an instrument that measures the flow rate and / or the total fluid volume over a selected time interval, and is widely used in sewage flow monitoring.

[0003] Flow meters are classified into differential pressure flow meters, rotor flow meters, throttling flow meters, slot flow meters, volumetric flow meters, electromagnetic flow meters, and ultrasonic flow meters, among others. Electromagnetic flow meters 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 unaffected 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 for monitoring sewage flow in wastewater pipelines.

[0004] However, in the use of electromagnetic flowmeters, if the content of air bubbles or solid particles in the liquid in the sewage pipe is too high, it will cover the electrodes and interfere with the electrode signal, causing measurement errors; and when the liquid in the pipe is not flowing at full capacity (such as low water 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 a flow meter for sewage pipelines to solve the problems in the use of existing electromagnetic flow meters, such as the interference of electrode signals caused by excessively high content of air bubbles or solid particles in the liquid in the sewage pipe, resulting in measurement errors; 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: A flow meter for sewage pipelines includes a metering chamber, a magnetic circuit system, electrodes, and a controller. The metering chamber is connected to an inlet pipe and an outlet pipe at its two ends. The magnetic circuit system and electrodes are both connected to the metering chamber. 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 processes the electrical signals monitored by the electrodes. Each electrode includes two pole pieces and an insulating sheet connecting the two pole pieces. The two pole pieces can be enclosed to form a cylinder, with the central axis of the cylinder perpendicular to the sewage flow direction. The two pole pieces are rotatably connected to the inner wall of the metering chamber, with one pole piece protruding from the inner wall and in contact with the sewage. The meter also includes a conductive contact, a rotating part, and a cleaning part. The conductive contact is connected to one of the pole pieces protruding from the inner wall of the metering chamber and is electrically connected to the controller. The rotating part drives the two electrodes to rotate, and the cleaning part cleans the pole piece that does not protrude from the inner wall of the metering chamber.

[0007] Furthermore, the cleaning unit includes a cleaning brush, a reciprocating screw, a cleaning arc, and a driving unit. The reciprocating screw is arranged along the length of the two electrodes and is rotatably connected to the metering chamber. The cleaning arc is coaxially arranged with the cylinder formed by the two electrodes. The cleaning arc is located on one side of an electrode that does not protrude from the inner wall of the metering chamber and is slidably connected to the reciprocating screw. The cleaning brush is located between the cleaning arc and an electrode that does not protrude from the inner wall of the metering chamber and abuts against the electrode. The driving unit is used to drive the reciprocating screw to rotate.

[0008] Furthermore, the rotating part includes a rotating rod, a driving rod, a disk, a guide ring, a supporting rod, and a first spring. One end of the guide ring has two symmetrically arranged high points, with a low point smoothly connected between them. The other end of the guide ring is coaxially connected to the disk. The line connecting the two high points of the guide ring lies on the plane formed by the central axis of the rotating rod and the central axis of the reciprocating screw. The disk has a through hole in its center, through which the rotating rod slidably passes. One end of the rotating rod is rotatably connected to the measuring chamber, and the other end is connected to one end of each of the two electrodes. The first spring is sleeved on the outer circumference of the rotating rod, and its two ends are respectively connected to the measuring chamber and the disk. The supporting rod is connected to the rotating rod in the middle, and its two ends abut against the two low points of the guide ring. One end of the driving rod is connected to the reciprocating screw, and the two ends of the supporting rod abut against the end of the driving rod.

[0009] Furthermore, the drive unit includes a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear, a connecting rod, and a turbine. The first bevel gear is coaxially arranged with and connected to the reciprocating screw. The connecting rod passes vertically through the side wall of the metering chamber and is rotatably connected to the side wall of the metering chamber perpendicular to the reciprocating screw. The second bevel gear is coaxially arranged with and connected to one end of the connecting rod, and the first bevel gear meshes with the second bevel gear. The third bevel gear is coaxially arranged with and connected to the other end of the connecting rod. The rotation center line of the turbine is arranged along the length direction of the metering chamber and is rotatably connected to the metering chamber. The fourth bevel gear is coaxially arranged with and connected to the turbine, and the fourth bevel gear meshes with the third bevel gear.

[0010] Furthermore, the metering chamber includes two main flanges arranged opposite each other along the length of the metering chamber, two side plates arranged opposite each other in the transverse direction and perpendicular to the two main flanges, two movable plates arranged opposite each other in the longitudinal direction and perpendicular to the two main flanges, and an adjustment part. The two side plates and the two movable plates are both located between the two main flanges and are arranged in the length direction of the main flanges. The two ends of the two side plates are connected to the main flanges, and the two ends of the two movable plates are slidably connected to the main flanges. The two movable plates are U-shaped and can be closed to form a column. The two opposite inner side walls of the U-shaped movable plates are vertical and slidably connected to the two side plates. The side walls of the movable plates are sealed to the side plates. The two side plates and the two movable plates enclose the metering chamber to form a metering cavity. The two ends of the metering cavity are connected to the inlet pipe and the outlet pipe. The electrode, conductive contact, rotating part and cleaning part are all connected to the side plates. The two main flanges are respectively connected to the main flanges of the inlet pipe and the outlet pipe. The adjustment part is used to adjust the sliding position of the two movable plates.

[0011] Furthermore, the adjustment part includes guide rods and second springs. There are eight guide rods, which are respectively located at the four corners of the two movable plates. The guide rods are vertically arranged and one end of the guide rod can slide up and down to connect to the main flange. The other end of the guide rod is connected to the movable plate. There are eight second springs, and the eight second springs are correspondingly sleeved on the outer circumference of the eight guide rods. Both ends of the eight second springs are respectively connected to the main flange and the movable plate.

[0012] Furthermore, it also includes a length sensor, the two ends of which are connected to the sidewalls of the same side of the two moving plates; the controller includes a data receiving module, a data conversion module, and a current amplifier, the length sensor is electrically connected to the data receiving module, the data receiving module is used to receive the length data of the length sensor and send it to the data conversion module; the current amplifier is electrically connected to a conductive contact and amplifies the received current signal and sends it to the data conversion module, the data conversion module is used to convert the length data and the amplified electrical signal data into flow rate data.

[0013] The beneficial effects of this invention are as follows: 1. This flow meter for sewage pipelines, by setting the electrodes into two parts that can be bound together into a cylinder, allows the electrode to be used for measurement while the other part can be cleaned. By periodically changing the position of the two electrodes, the adhesion of impurities to the electrodes can be reduced, reducing the possibility of impurities in sewage remaining on the electrodes and causing scale buildup. To a certain extent, this ensures that the conductivity of the electrodes is not affected by impurities, thus making the flow meter more accurate in measuring sewage.

[0014] 2. This flow meter for sewage pipelines, by setting a drive unit, allows the sewage flow to drive the cleaning unit to clean the electrode plates while simultaneously rotating the electrodes. It can achieve electrode rotation and cleaning simultaneously without manual intervention or additional energy, reducing energy consumption and saving energy.

[0015] 3. This flow meter for sewage pipelines, by setting the metering chamber to a cross-section that can be enlarged and reduced, ensures that the sewage can fill the pipe to a certain extent, thereby reducing the possibility of data fluctuations; at the same time, by enlarging and reducing the cross-section of the metering chamber, the water flow speed can be adjusted, reducing the possibility that solid impurities will hit the electrodes too hard due to excessive water flow, causing electrode damage, or that the water flow is too slow to drive the turbine to rotate, thus preventing the cleaning unit from operating.

[0016] 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

[0017] Figure 1 This is the front view of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention after the outer shell has been removed; Figure 3 This is a partial structural cross-sectional view of the side plate where the electrodes of this invention are located; Figure 4 This is a schematic diagram of the linkage structure of the electrode, rotating part and cleaning part of the present invention.

[0018] In the diagram: 1. Metering chamber; 11. Main flange; 12. Side plate; 13. Moving plate; 141. Guide rod; 142. Second spring; 2. Controller; 3. Electrode; 31. Electrode plate; 32. Insulating sheet; 4. Rotating part; 41. Rotating rod; 42. Drive rod; 43. Disc; 44. Guide ring; 441. High point; 45. Support rod; 46. First spring; 5. Cleaning part; 51. Cleaning brush; 52. Reciprocating screw; 53. Cleaning arc; 54. Drive part; 541. First bevel gear; 542. Second bevel gear; 543. Third bevel gear; 544. Fourth bevel gear; 545. Connecting rod; 546. Turbine; Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-4 This invention provides a flow meter solution for sewage pipelines: a flow meter for sewage pipelines includes a metering chamber 1, a magnetic circuit system, electrodes 3, and a controller 2. The metering chamber 1 is connected to an inlet pipe and an outlet pipe at its two ends, respectively. The magnetic circuit system and electrodes 3 are both connected to the metering chamber 1. The magnetic circuit system generates a uniform alternating magnetic field. The electrodes 3 monitor the induced electromotive force signal generated by the fluid cutting magnetic field lines. The controller 2 processes the electrical signal monitored by the electrodes 3. The electrodes 3 include two pole pieces 31 and an insulating sheet connecting the two pole pieces 31. 32. The two electrodes 31 can be enclosed to form a cylinder. The central axis of the cylinder formed by the two electrodes 31 is perpendicular to the direction of sewage flow. The two electrodes 31 are rotatably connected to the inner wall of the metering chamber 1, and any one of the electrodes 31 protrudes from the inner wall of the metering chamber 1 and contacts the sewage. It also includes a conductive contact, a rotating part 4, and a cleaning part 5. The conductive contact is connected to one of the electrodes 31 protruding from the inner wall of the metering chamber 1. The conductive contact is electrically connected to the controller 2. The rotating part 4 is used to drive the two electrodes 3 to rotate. The cleaning part 5 is used to clean the electrode 31 that does not protrude from the inner wall of the metering chamber 1.

[0021] When using the flow meter for sewage pipes of the present invention to measure sewage, the sewage enters the metering chamber 1 from the inlet pipe and flows to the outlet pipe along the length direction of the meter. Since the two electrodes 31 can form a cylinder, and the central axis of the cylinder formed by the two electrodes 31 is set perpendicular to the sewage flow direction, the sewage flows and carries impurities in the sewage along the arc surface of the cylinder, reducing the possibility of impurities in the sewage being retained at the electrode 3. Since the rotating part 4 is used to drive the two electrodes 3 to rotate, and the cleaning part 5 is used to clean the electrode 31 that does not protrude from the inner wall of the metering chamber 1, and the conductive contact is connected to the electrode 31 that protrudes from the inner wall of the metering chamber 1, the rotating part 4 drives the two electrodes 31 to rotate, so that the two electrodes 31 periodically protrude from the inner wall of the metering chamber 1. Thus, the two electrodes 31 alternately connect to the conductive contact to receive electrical signals, and the electrode 31 that does not protrude from the inner wall of the metering chamber 1 is cleaned by the cleaning part 5. This periodic alternating cleaning reduces the possibility of scale buildup on the electrode 3 to a certain extent.

[0022] Since the electrode 3 includes two electrode pieces 31 and an insulating sheet 32 ​​connecting the two electrode pieces 31, the electrode pieces 31 that do not protrude from the inner wall of the metering chamber 1 will not affect the electrode pieces 3 that protrude from the surface of the metering chamber 1 from receiving electrical signals when they are cleaned.

[0023] With this structure, when using a flow meter for sewage pipelines according to the present invention to measure sewage, the possibility of impurities in the sewage remaining on the electrode 3 and causing scale buildup on the electrode 3 can be reduced. To a certain extent, this ensures that the conductivity of the electrode 3 is not affected by the adhesion of impurities, thereby making the flow meter more accurate in measuring sewage.

[0024] In this embodiment: the cleaning unit 5 includes a cleaning brush 51, a reciprocating screw 52, ​​a cleaning arc 53, and a driving unit 54. The reciprocating screw 52 is arranged along the length direction of the two electrode plates 31 and is rotatably connected to the metering chamber 1. The cleaning arc 53 is arranged coaxially with the cylinder formed by the two electrode plates 31. The cleaning arc 53 is located on one side of an electrode plate 31 that does not protrude from the inner wall of the metering chamber 1 and is slidably connected to the reciprocating screw 52. The cleaning brush 51 is located between the cleaning arc 53 and an electrode plate 31 that does not protrude from the inner wall of the metering chamber 1 and abuts against the electrode plate 31. The driving unit 54 is used to drive the reciprocating screw 52 to rotate.

[0025] The reciprocating screw 52 is driven to rotate by the drive unit 54, thereby causing the cleaning arc 53 to move up and down along the reciprocating screw 52. Since the cleaning brush 51 is located between the cleaning arc 53 and an electrode 31 that does not protrude from the inner wall of the metering chamber 1 and abuts against the electrode 31, the cleaning arc 53 moves up and down, thereby causing the cleaning brush 51 to move up and down to clean the electrode 31 that does not protrude from the inner wall of the metering chamber 1. With this structure, the cleaning unit 5 can periodically reciprocate to clean the electrode 31 that does not protrude from the inner wall of the metering chamber 1.

[0026] In this embodiment: the rotating part 4 includes a rotating rod 41, a driving rod 42, a disk 43, a guide ring 44, a supporting rod 45, and a first spring 46. One end face of the guide ring 44 has two symmetrically arranged high points 441, with the low point between the two high points 441 smoothly connected. The other end face of the guide ring 44 is coaxially connected to the disk 43. The line connecting the two high points 441 of the guide ring 44 lies on the plane formed by the central axis of the rotating rod 41 and the central axis of the reciprocating screw 52. The disk 43 has a through hole in the middle, allowing the rotating rod 41 to slide. The rotating rod 41 passes through the through hole and is rotatably connected at one end to the measuring chamber 1 and at the other end to one end of the two electrode plates 31. The first spring 46 is sleeved on the outer circumferential surface of the rotating rod 41 and the two ends of the first spring 46 are respectively connected to the measuring chamber 1 and the disc 43. The middle part of the abutting rod 45 is connected to the rotating rod 41, and the two ends of the abutting rod 45 abut against the two low points of the guide ring 44. One end of the driving rod 42 is connected to the reciprocating screw 52, ​​and the two ends of the abutting rod 45 can abut against the one end of the driving rod 42.

[0027] When the threaded rod rotates one revolution, causing the cleaning brush 51 to slide up and down to clean the electrode 31 that does not protrude from the inner wall of the metering chamber 1, the threaded rod drives the drive rod 42 to rotate. When one end of the drive rod 42 rotates to the side facing the disc 43, it abuts against one end of the abutting rod 45. Since the middle of the abutting rod 45 is connected to the rotating rod 41, one end of the abutting rod 45 can rotate a certain angle under the abutment of the drive rod 42. Since one end of the guide ring 44 is symmetrically provided with two high points 441, and the low points between the two high points 441 are smoothly connected to each other, the two ends of the abutting rod 45 abut against the two low points of the guide ring 44 respectively. At this time, one end of the abutting rod 45 abuts against... The guide ring 44 faces a low point of the reciprocating screw 52, ​​and since the other end face of the guide ring 44 is coaxially connected to the disk 43, the disk 43 has a through hole in the middle, and the rotating rod 41 can slide through the through hole. When the abutment rod 45 rotates, it will abut against the end face of the guide ring 44 and slide upward along the length direction of the rotating rod 41, that is, push the disk 43 and the guide ring 44 to slide upward. Since the first spring 46 is sleeved on the outer circumferential surface of the rotating rod 41 and the two ends of the first spring 46 are respectively connected to the metering chamber 1 and the disk 43, the disk 43 squeezes the spring during the upward sliding process until the abutment rod 45 reaches the high point 441 of the guide ring 44.

[0028] After the holding rod 45 reaches the high point 441 of the guide ring 44, the drive rod 42 disengages from the guide rod 141. The drive rod 42 continues to rotate with the reciprocating screw 52, ​​while the guide rod 141 passes through the highest point 441 under the action of inertia. At this time, the first spring 46 begins to release pressure due to the loss of the thrust of the disk 43, pushing the disk 43 and the guide ring 44 to slide downward. Since the low points between the two high points 441 are smoothly connected, the guide ring 44 pushes the holding rod 45 to continue rotating during the downward movement until one end of the holding rod 45 enters the next low point. At this time, the other end of the holding rod 45 reaches the low point facing the reciprocating screw 52. When the reciprocating screw 52 drives the drive rod 42 to rotate one revolution, one end of the drive rod 42 abuts against the other end of the holding rod 45 and drives the other end of the holding rod 45 to start rotating to the high point 441. This process repeats, so that the reciprocating screw 52 can rotate while driving the electrode 3 to rotate.

[0029] Specifically, the guide ring 44 moves towards the next high point 441 along the rotation direction of the abutment rod 45 from the low point on the side facing the reciprocating screw 52. Another low point and high point 441 on the guide ring 44 are symmetrically arranged with respect to the low point and high point 441 on the side facing the reciprocating screw 52. With this structure, when the abutment rod 45 rotates to the high point 441 along the two adjacent low points, the electrode 3 rotates only a small angle. This small angle is such that the electrode plates 31 on both sides of the insulating sheet 32 ​​will not simultaneously enter the inner wall of the measuring chamber 1. After the abutment rod 45 reaches the high point 441, it slides quickly to the next low point under the push of the first spring 46, thereby allowing the two electrode plates 31 to quickly exchange positions. With this structure, the possibility of the two electrode plates 31 being used for measurement and cleaning at the same time can be reduced, and the possibility of one electrode plate 31 interfering with the measurement of the other electrode plate 31 when it is being cleaned can be reduced.

[0030] Specifically, the thread of the reciprocating screw 52 is configured such that when the reciprocating screw 52 rotates one revolution, the cleaning arc 53 moves down or up a full stroke. With this structure, the cleaning brush 51 can complete a full cleaning of the electrode 31 each time it rotates.

[0031] In this embodiment: the drive unit 54 includes a first bevel gear 541, a second bevel gear 542, a third bevel gear 543, a fourth bevel gear 544, a connecting rod 545, and a turbine 546. The first bevel gear 541 is coaxially arranged with and connected to the reciprocating screw 52. The connecting rod 545 passes vertically through the side wall of the metering chamber 1 and is rotatably connected to the side wall of the metering chamber 1 perpendicular to the reciprocating screw 52. The second bevel gear 542 is coaxially arranged with and connected to one end of the connecting rod 545. The first bevel gear 541 meshes with the second bevel gear 542. The third bevel gear 543 is coaxially arranged with and connected to the other end of the connecting rod 545. The rotation center line of the turbine 546 is arranged along the length direction of the metering chamber 1 and is rotatably connected to the metering chamber 1. The fourth bevel gear 544 is coaxially arranged with and connected to the turbine 546. The fourth bevel gear 544 meshes with the third bevel gear 543.

[0032] When using a flow meter for sewage pipelines according to the present invention to measure sewage flow, since the rotation center line of the turbine 546 is arranged along the length direction of the metering chamber 1 and is rotatably connected to the metering chamber 1, sewage entering the metering chamber 1 drives the turbine 546 to rotate. The rotation of the turbine 546 drives the fourth bevel gear 544 to rotate. Since the fourth bevel gear 544 meshes with the third bevel gear 543, the rotation of the fourth bevel gear 544 can drive the third bevel gear 543 to rotate. Since the second bevel gear 542 is coaxially arranged with the connecting rod 545 and connected to the metering chamber 1, the flow meter is rotatably connected to the metering chamber 1. Connecting one end of the connecting rod 545, the third bevel gear 543 is coaxially arranged with the connecting rod 545 and connected to the other end of the connecting rod 545. The rotation of the third bevel gear 543 drives the connecting rod 545 to rotate, thereby driving the second bevel gear 542 to rotate. Since the first bevel gear 541 and the second bevel gear 542 mesh, the first bevel gear 541 is coaxially arranged with the reciprocating screw 52 and connected to the reciprocating screw 52. The rotation of the second bevel gear 542 drives the first bevel gear 541 to rotate, thereby driving the reciprocating screw 52 to rotate.

[0033] With this structure, the drive unit 54 can drive the reciprocating screw 52 to rotate. Since the drive unit 54 drives the reciprocating screw 52 to rotate through the flow of sewage, the driving function can be achieved without the use of other energy sources, thus saving energy to a certain extent.

[0034] In this embodiment: the measuring chamber 1 includes two main flanges 11 arranged opposite each other along the length of the measuring chamber 1, two side plates 12 arranged perpendicular to the two main flanges 11 and arranged opposite each other in the transverse direction, two movable plates 13 arranged perpendicular to the two main flanges 11 and arranged opposite each other in the longitudinal direction, and an adjustment part. The two side plates 12 and the two movable plates 13 are all located between the two main flanges 11 and are arranged along the length of the main flanges 11. The two ends of the two side plates 12 are connected to the main flanges 11, and the two ends of the two movable plates 13 are slidably connected to the main flanges 11. The movable plate 13 is U-shaped and can be closed in two phases to form a column. The two opposing inner sidewalls of the U-shaped movable plate 13 are vertically and slidably connected to the two side plates 12. The sidewalls of the movable plate 13 are sealed to the side plates 12. The two side plates 12 and the two movable plates 13 enclose a metering chamber, with the inlet and outlet pipes connected at both ends. The electrode 3, conductive contact, rotating part 4, and cleaning part 5 are all connected to the side plates 12. The two main flanges 11 are respectively connected to the main flanges 11 of the inlet and outlet pipes. The adjusting part is used to adjust the sliding position of the two movable plates 13. Specifically, the through-hole size in the middle of the main flange 11 for sewage flow is the maximum size that the metering chamber can form.

[0035] The two movable plates 13 are U-shaped and can be closed to form a column. The two inner sidewalls of the movable plates 13 are vertical and slidably connected to the two side plates 12. When the sewage flow rate decreases and cannot reach the full pipe, the cross-sectional area of ​​the metering cavity formed by the movable plates 13 and the side plates 12 decreases as the two movable plates 13 move closer to each other, thereby filling the pipe with sewage in the metering chamber 1. This reduces the problem of flow meter reading jumps to a certain extent, and also reduces the possibility that the turbine 546 will fail due to the sewage flow rate being too slow, which would prevent the sewage from driving the turbine 546 to rotate. When the sewage flow rate increases, the two movable plates 13 move away from each other, thereby increasing the cross-sectional area of ​​the metering cavity formed by the movable plates 13 and the side plates 12. This reduces the flow rate of sewage in the metering chamber 1, thereby reducing the possibility that the impurities in the sewage will excessively impact the inner wall of the metering chamber 1 due to the excessive flow rate of sewage in the metering chamber 1, resulting in excessive scratches on the inner wall of the metering chamber 1.

[0036] In this embodiment: the adjustment part includes guide rods 141 and second springs 142. There are eight guide rods 141, which are respectively located at the four corners of the two movable plates 13. The guide rods 141 are vertically arranged and one end of the guide rods 141 can be slidably connected to the main flange 11. The other end of the guide rods 141 is connected to the movable plate 13. There are eight second springs 142, and the eight second springs 142 are correspondingly sleeved on the outer circumferential surface of the eight guide rods 141. Both ends of the eight second springs 142 are respectively connected to the main flange 11 and the movable plate 13.

[0037] When no sewage is introduced into the metering chamber 1, the first spring 46 pushes the two moving plates 13 closer together until the cross-sectional area of ​​the metering chamber reaches its minimum. When sewage is introduced into the metering chamber 1, the pressure of the sewage on the side wall of the moving plate 13 pushes the moving plates 13 away from each other, thereby increasing the cross-sectional area of ​​the metering chamber. At this time, the moving plates 13 squeeze the first spring 46. When the sewage flow rate decreases, the pressure of the sewage on the side wall of the moving plate 13 decreases. At this time, the first spring 46 releases the pressure, thereby pushing the moving plates 13 closer together, thereby decreasing the cross-sectional area of ​​the metering chamber. With this structure, the adjustment part can be used to adjust the sliding position of the two moving plates 13 relative to the two side plates 12.

[0038] In this embodiment, a length sensor is also included, with both ends of the length sensor connected to the sidewalls of the same side of the two movable plates 13. The controller 2 includes a data receiving module, a data conversion module, and a current amplifier. The length sensor is electrically connected to the data receiving module, which receives the length data from the length sensor and sends it to the data conversion module. The current amplifier is electrically connected to a conductive contact and amplifies the received current signal before sending it to the data conversion module. The data conversion module converts the length data and the amplified electrical signal data into flow rate data.

[0039] Since the two ends of the length sensor are connected to the side walls of the two moving plates 13, when the two moving plates 13 move away from or move closer to each other, the cross-sectional area of ​​the metering cavity can be obtained by sensing the relative position of the two moving plates 13 through the length sensor. The flow rate data can be obtained by converting the cross-sectional area of ​​the metering cavity and the amplified electrical signal through the data conversion module. With this structure, when using the flow meter for sewage pipes of the present invention to measure sewage pipes, the flow rate can be converted in real time according to the cross-sectional size of the metering cavity, making the calculation of sewage flow rate more accurate.

[0040] 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 for sewage pipelines, comprising a metering chamber, a magnetic circuit system, electrodes, and a controller, wherein the two ends of the metering chamber are respectively connected to an inlet pipe and an outlet pipe, the magnetic circuit system and the electrodes are both connected to the metering chamber, the magnetic circuit system is used to generate a uniform alternating magnetic field, the electrodes are used to monitor the induced electromotive force signal induced by the fluid cutting magnetic field lines, and the controller is used to process the electrical signal monitored by the electrodes; characterized in that: The electrode includes two electrode plates and an insulating sheet connecting the two electrode plates. The two electrode plates can be enclosed to form a cylinder. The central axis of the cylinder formed by the two electrode plates is perpendicular to the sewage flow direction. The two electrode plates are rotatably connected to the inner wall of the metering chamber, and any one of the electrode plates protrudes from the inner wall of the metering chamber and contacts the sewage. It also includes a conductive contact, a rotating part, and a cleaning part. The conductive contact is connected to one of the electrode plates protruding from the inner wall of the metering chamber and is electrically connected to the controller. The rotating part is used to drive the two electrodes to rotate, and the cleaning part is used to clean the electrode plate that does not protrude from the inner wall of the metering chamber.

2. A flow meter for sewage pipelines according to claim 1, characterized in that: The cleaning unit includes a cleaning brush, a reciprocating screw, a cleaning arc, and a drive unit. The reciprocating screw is arranged along the length of the two electrodes and is rotatably connected to the metering chamber. The cleaning arc is coaxial with the cylinder formed by the two electrodes. The cleaning arc is located on one side of an electrode that does not protrude from the inner wall of the metering chamber and is slidably connected to the reciprocating screw. The cleaning brush is located between the cleaning arc and an electrode that does not protrude from the inner wall of the metering chamber and abuts against the electrode. The drive unit is used to drive the reciprocating screw to rotate.

3. A flow meter for sewage pipelines according to claim 2, characterized in that: The rotating part includes a rotating rod, a driving rod, a disk, a guide ring, a supporting rod, and a first spring. One end of the guide ring has two symmetrically arranged high points, with a low point smoothly connected between them. The other end of the guide ring is coaxially connected to the disk. The line connecting the two high points of the guide ring lies on the plane formed by the central axis of the rotating rod and the central axis of the reciprocating screw. The disk has a through hole in its center, through which the rotating rod slidably passes. One end of the rotating rod is rotatably connected to the measuring chamber, and the other end is connected to one end of each of the two electrodes. The first spring is sleeved on the outer circumference of the rotating rod, and its two ends are respectively connected to the measuring chamber and the disk. The supporting rod is connected to the rotating rod in the middle, and its two ends abut against the two low points of the guide ring. One end of the driving rod is connected to the reciprocating screw, and the two ends of the supporting rod abut against the end of the driving rod.

4. A flow meter for sewage pipelines according to claim 3, characterized in that: The drive unit includes a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear, a connecting rod, and a turbine. The first bevel gear is coaxially arranged with and connected to the reciprocating screw. The connecting rod passes perpendicularly through the side wall of the metering chamber and is rotatably connected to the side wall of the metering chamber perpendicular to the reciprocating screw. The second bevel gear is coaxially arranged with and connected to one end of the connecting rod, and the first bevel gear meshes with the second bevel gear. The third bevel gear is coaxially arranged with and connected to the other end of the connecting rod. The rotation center line of the turbine is arranged along the length of the metering chamber and is rotatably connected to the metering chamber. The fourth bevel gear is coaxially arranged with and connected to the turbine, and the fourth bevel gear meshes with the third bevel gear.

5. A flow meter for sewage pipelines according to claim 4, characterized in that: The metering chamber includes two main flanges arranged opposite each other along the length of the chamber, two side plates arranged perpendicular to the two main flanges and arranged opposite each other laterally, two movable plates arranged perpendicular to the two main flanges and arranged opposite each other longitudinally, and an adjustment part. The two side plates and the two movable plates are both located between the two main flanges and are arranged along the length of the main flanges. The two ends of the two side plates are connected to the main flanges, and the two ends of the two movable plates are slidably connected to the main flanges. The two movable plates are U-shaped and can be closed to form a column. The two opposite inner side walls of the U-shaped movable plates are vertical and slidably connected to the two side plates. The side walls of the movable plates are sealed to the side plates. The two side plates and the two movable plates enclose the metering chamber to form a metering cavity. The two ends of the metering cavity are connected to an inlet pipe and an outlet pipe. The electrodes, conductive contacts, rotating parts, and cleaning parts are all connected to the side plates. The two main flanges are respectively connected to the main flanges of the inlet pipe and the outlet pipe. The adjustment part is used to adjust the sliding position of the two movable plates.

6. A flow meter for sewage pipelines according to claim 5, characterized in that: The adjustment part includes guide rods and second springs. There are eight guide rods, which are respectively located at the four corners of the two movable plates. The guide rods are vertically arranged and one end of the guide rod can be slidably connected to the main flange. The other end of the guide rod is connected to the movable plate. There are eight second springs, and the eight second springs are correspondingly sleeved on the outer circumference of the eight guide rods. Both ends of the eight second springs are respectively connected to the main flange and the movable plate.

7. A flow meter for sewage pipelines according to claim 6, characterized in that: It also includes a length sensor, the two ends of which are connected to the sidewalls of the same side of two moving plates; the controller includes a data receiving module, a data conversion module, and a current amplifier. The length sensor is electrically connected to the data receiving module, which receives the length data from the length sensor and sends it to the data conversion module; the current amplifier is electrically connected to a conductive contact and amplifies the received current signal before sending it to the data conversion module, which converts the length data and the amplified electrical signal data into flow rate data.

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