Electromagnetic water meter
By setting up a flow guide support mechanism and a leakage detection mechanism in the electromagnetic water meter, the leakage problem caused by the gap between the electrodes and pipelines is solved, real-time monitoring and fault warning of the excitation system are achieved, and measurement accuracy and equipment reliability are ensured.
Patent Information
- Application Number
- CN202411383842.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2024-12-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The gap in the electromagnetic water meter increases due to the difference in thermal expansion and contraction of the electrode and pipeline materials, resulting in water leakage, which in turn corrodes the internal circuit, affecting the measurement accuracy and being difficult to detect.
Design a flow guide support mechanism, centralized moisture isolation mechanism, leakage detection mechanism and circuit control mechanism to fill the electrode head gap through the transformer oil circulation flow, and timely detect leakage through the leakage detection mechanism to avoid data distortion and circuit corrosion.
Real-time monitoring and fault warning of electromagnetic water meter excitation system are realized, ensuring measurement accuracy and reliability, and extending the service life of the equipment.
Smart Images
Figure CN119104124A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of water meters, in particular to an electromagnetic water meter. Background Art
[0002] Electromagnetic water meters are based on Faraday's electromagnetic induction principle. They measure the induced electromotive force generated by water flowing in a pipe in a magnetic field. The electromotive force is proportional to the water flow velocity, so as to accurately calculate the water flow rate. The specific structure and composition include pipes, excitation coils, two electrodes, excitation circuits, signal amplification circuits, signal processing units and data communication units. The excitation circuit is used to generate a stable magnetic field. The two electrodes penetrate the pipe wall along the pipe diameter and are fixed on the measuring pipe. When water flows through, the induction electrodes will generate an induced electromotive force proportional to the flow rate. The signal amplification circuit and the signal processing unit amplify, filter and digitize the induced electromotive force to obtain accurate flow data, and output the flow data through the communication unit.
[0003] In an electromagnetic water meter, in order to measure the electromotive force, two electrodes need to be introduced into the water channel of the water meter to contact the water flow. In order to ensure conductivity, the material of the electrode and the electrode insulation material are different from the material of the water meter pipe. Affected by the difference in thermal expansion and contraction of different materials, the gap between the electrode and the pipe will gradually increase. Since there are no other internal extension components inside the pipe of the electromagnetic water meter, this gap will become the most easily damaged infiltration point between the water channel of the water meter and the interior of the water meter. After long-term use and wear, water will generally penetrate into the device from this gap and gather inside. When the seepage is small, it is difficult for the outside world to detect this situation. These water flows can easily corrode the internal circuit of the water meter, causing the accuracy of the water meter to decrease without being detected. Summary of the invention
[0004] In view of the deficiencies in the prior art, the present invention provides an electromagnetic water meter to solve the problems mentioned in the above background.
[0005] The present invention provides the following technical solution: an electromagnetic water meter, comprising: a flow guide support mechanism, a centralized moisture-proof mechanism is fixedly installed inside the flow guide support mechanism, a leakage detection mechanism is arranged on the top of the centralized moisture-proof mechanism, an external support mechanism is arranged on the surface of the flow guide support mechanism, and a circuit control mechanism is arranged inside the flow guide support mechanism.
[0006] Preferably, the flow diversion support mechanism includes a flow diversion detection pipe, a connecting flange, a moisture-proof sleeve, a sealing sleeve shell, an inner lining layer, a detection coil, a distribution shell and a display screen, the connecting flange is integrally arranged on both sides of the flow diversion detection pipe, the moisture-proof sleeve and the sealing sleeve shell are fixedly sleeved on the surface of the flow diversion detection pipe, the inner lining layer is fixedly connected to the inner wall of the flow diversion detection pipe, the number of the detection coils is two, and the two detection coils are fixedly installed on the surface of the moisture-proof sleeve, and the two detection coils are respectively a transmitting coil and a receiving coil, the distribution shell is fixedly installed on the surface of the sealing sleeve shell, and the display screen is fixedly installed on the inner wall of the top of the distribution shell.
[0007] Preferably, the centralized moisture-proof mechanism includes a flow guide channel, a docking tube, an electrode head and an insulating sleeve. The flow guide channel is fixedly connected to the surface of the moisture-proof sleeve. There are two docking tubes, and both of them are fixedly plugged into the surface of the flow guide channel. There are two groups of insulating sleeves, and both groups of insulating sleeves are fixedly plugged into the inside of the flow guide channel, and the two groups of insulating sleeves are relatively distributed. There are two electrode heads, and both electrode heads are fixedly connected to the inside of the two groups of insulating sleeves, respectively.
[0008] Preferably, the centralized moisture-proof mechanism also includes a liquid storage tank, an inner support plate, a liquid pump, a cover plate and a liquid guide tube. The liquid storage tank is fixedly mounted on the surface of the sealing shell, the inner support plate and the cover plate are fixedly connected to the inner wall of the liquid storage tank, the liquid pump is fixedly mounted between the inner support plate and the cover plate, and the liquid guide tube is fixedly mounted at the output end of the liquid pump.
[0009] Preferably, the centralized moisture-proof mechanism also includes a filter box, a sealing plate and a dust filter block, the filter box is fixedly mounted on the surface of the sealing sleeve, the sealing plate is fixedly connected to the inner wall of the filter box, the dust filter block is fixedly mounted inside the filter box, and the interior of the filter box, the interior of the guide channel and the interior of the liquid storage tank are all filled with transformer oil.
[0010] Preferably, the leakage detection mechanism includes an air cylinder, an observation window, an inner support ring, a piston, a sliding column, a compressed air spring, a pressure relief port, a sealing ring and a sealing head, the air cylinder is fixedly inserted in the top of the sealing plate, the observation window is fixedly connected to the surface of the air cylinder, the inner support ring is fixedly connected to the inner wall of the bottom end of the air cylinder, the piston is slidably connected to the inside of the air cylinder, the sliding column is fixedly inserted in the top of the piston, and the surface of the sliding column is slidably connected to the inner wall of the air cylinder, the compressed air spring is movably installed between the air cylinder and the piston, the pressure relief port is integrally arranged on one side of the air cylinder, the sealing ring is fixedly connected to the inner wall of the pressure relief port, and the sealing head is threadedly connected to the inside of the pressure relief port.
[0011] Preferably, the external support mechanism includes a first support flange, a second support flange, a first support arm, a second support arm and a rubber ring, the first support flange and the second support flange are respectively fixedly mounted on one end of two connecting flanges by bolts, the first support arm is integrally arranged on the surface of the first support flange, the second support arm is fixedly mounted on the surface of the second support flange, and the rubber ring is respectively fixedly mounted on both sides of the first support flange and both sides of the second support flange.
[0012] Preferably, the external support mechanism also includes a rubber block, a plug-in column and a slide groove, the rubber block is fixedly connected between the first support arm and the second support arm, the plug-in column is fixedly plugged into one end of the first support arm, the slide groove is opened at one end of the second support arm, and the surface of the plug-in column is slidably connected to the inner wall of the slide groove.
[0013] Preferably, the circuit control mechanism includes an empty pipe detection unit, an electrode interface and a signal amplifying unit, an MCU control unit and a voltage signal ADC unit, the input end of the empty pipe detection unit is signal-connected to the output end of the MCU control unit, and the output end of the empty pipe detection unit is signal-connected to the input end of the MCU control unit, the output end of the electrode interface and the signal amplifying unit is signal-connected to the input end of the voltage signal ADC unit, the output end of the voltage signal ADC unit is signal-connected to the input end of the MCU control unit, and the electrode interface and the signal amplifying unit are electrically connected to the two electrode heads through wires, and the display screen is electrically connected to the MCU control unit.
[0014] Preferably, the circuit control mechanism also includes an excitation and excitation state detection unit and a power supply unit, the input end of the excitation and excitation state detection unit is signal-connected to the output end of the MCU control unit, and the output end of the excitation and excitation state detection unit is signal-connected to the input end of the MCU control unit, the output end of the power supply unit is electrically connected to the input end of the empty pipe detection unit, the input end of the electrode interface and the signal amplification unit, the input end of the MCU control unit, the input end of the voltage signal ADC unit and the input end of the excitation and excitation state detection unit, and the input end of the power supply unit is signal-connected to the output end of the MCU control unit, and the excitation and excitation state detection unit is electrically connected to the detection coil.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] 1. The electromagnetic water meter, through the excitation and excitation state detection unit circuit, can detect the on-off state of the excitation coil by detecting the change of the output voltage of the operational amplifier U4. When the excitation coil is in the on state, the short-circuit state of the excitation coil can be detected by detecting the voltage change of the P2 pin of the bridge U3, so as to perform real-time monitoring and fault warning of the excitation system.
[0017] 2. The electromagnetic water meter, through the set diversion support mechanism, centralized moisture-proof mechanism, leakage detection mechanism, external support mechanism and circuit control mechanism, can fill the gap around the electrode head through the circulation of transformer oil, and timely detect the degree of leakage through the leakage detection mechanism, so as to facilitate timely maintenance and avoid data distortion. At the same time, it ensures that the seepage water can be centralized and isolated to avoid corrosion to the internal circuit of the device immediately after leakage.
[0018] 3. The electromagnetic water meter can form a certain isolation for the transformer oil through the diversion channel, butt pipe, electrode head, insulating sleeve, liquid storage tank, inner support plate, liquid pump, cover plate, liquid guide pipe, filter box, sealing plate and dust filter block, so as to avoid corrosion of short circuit immediately after leakage, so that the accuracy of the device can be maintained until the inspection by maintenance personnel.
[0019] 4. The electromagnetic water meter can convert the leakage signal into the expansion and contraction signal of the sliding column through the air storage cylinder, observation window, inner support ring, piston, sliding column, compressed air spring, pressure relief port, sealing ring and sealing head, so as to ensure that personnel can detect it in time.
[0020] 5. The electromagnetic water meter, through the first support flange, the second support flange, the first support arm, the second support arm and the rubber ring, can provide support when the diversion detection pipeline is replaced, avoid the misalignment of the pipelines at both ends due to the disappearance of stress, and ensure that there will be no misalignment during subsequent installation.
[0021] 6. The electromagnetic water meter is provided with rubber blocks, plug-in columns and slide grooves to provide telescopic redundancy when the diversion detection pipeline is replaced, thereby preventing the diversion detection pipeline from being stuck between the first supporting flange and the second supporting flange. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the structure of the present invention;
[0023] Figure 2 It is the main cross-sectional view of the present invention;
[0024] Figure 3 It is a top cross-sectional view of the present invention;
[0025] Figure 4 It is a side sectional view of the present invention;
[0026] Figure 5 This is a structural schematic diagram of the location of the centralized moisture isolation mechanism of the present invention;
[0027] Figure 6 This is a schematic diagram of the internal explosion structure of the centralized moisture isolation mechanism of the present invention;
[0028] Figure 7 It is a cross-sectional view of the leakage detection mechanism of the present invention;
[0029] Figure 8 This is a structural block diagram of the circuit control mechanism of the present invention;
[0030] Fig. 9 This is a circuit schematic diagram of the excitation and excitation state detection unit of the present invention;
[0031] Fig.10 This is a schematic diagram of the voltage signal ADC unit circuit of the present invention;
[0032] Fig.11 This is a schematic diagram of the circuit of the electrode interface and the signal amplification unit of the present invention;
[0033] Fig.12 This is a circuit schematic diagram of the MCU control unit of the present invention;
[0034] Fig.13 This is a circuit schematic diagram of an empty pipe detection unit of the present invention;
[0035] Fig.14 This is a schematic diagram of the power supply unit circuit of the present invention.
[0036] In the figure: 1. flow guide support mechanism; 101. flow guide detection pipeline; 102. connecting flange; 103. moisture-proof sleeve; 104. sealing sleeve shell; 105. lining layer; 106. detection coil; 107. power distribution shell; 108. display screen; 2. centralized moisture-proof mechanism; 201. flow guide channel; 202. butt joint pipe; 203. electrode head; 204. insulating sleeve; 205. liquid storage box; 206. inner support plate; 207. liquid pump; 208. cover plate; 209. liquid guide tube; 210. filter box; 211. sealing plate; 212. dust filter block; 3. leakage detection mechanism; 301. gas storage cylinder; 302. observation window; 303. inner support plate Ring; 304, piston; 305, sliding column; 306, compressed air spring; 307, pressure relief port; 308, sealing ring; 309, sealing head; 4, external support mechanism; 401, first supporting flange; 402, second supporting flange; 403, first supporting arm; 404, second supporting arm; 405, rubber ring; 406, rubber block; 407, plug-in column; 408, slide groove; 5, circuit control mechanism; 501, empty pipe detection unit; 502, electrode interface and signal amplification unit; 503, MCU control unit; 504, voltage signal ADC unit; 505, excitation and excitation state detection unit; 506, power supply unit. DETAILED DESCRIPTION
[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0038] See also Figure 1-8 An electromagnetic water meter comprises: a flow guide support mechanism 1, a centralized moisture-proof mechanism 2 is fixedly installed inside the flow guide support mechanism 1, a leakage detection mechanism 3 is arranged on the top of the centralized moisture-proof mechanism 2, an external support mechanism 4 is arranged on the surface of the flow guide support mechanism 1, and a circuit control mechanism 5 is arranged inside the flow guide support mechanism 1. Through the flow guide support mechanism 1, the centralized moisture-proof mechanism 2, the leakage detection mechanism 3, the external support mechanism 4 and the circuit control mechanism 5, the gap around the electrode head 203 can be filled by the circulation of transformer oil, and the leakage degree can be detected in time through the leakage detection mechanism 3, which is convenient for timely maintenance and avoids data distortion. At the same time, it ensures that the seepage water can be centralized and isolated to avoid corrosion to the internal circuit of the device immediately after the leakage.
[0039] Among them; the diversion support mechanism 1 includes a diversion detection pipe 101, a connecting flange 102, a moisture-proof sleeve 103, a sealing sleeve shell 104, an inner lining layer 105, a detection coil 106, a distribution shell 107 and a display screen 108. The connecting flange 102 is integrally arranged on both sides of the diversion detection pipe 101. The moisture-proof sleeve 103 and the sealing sleeve shell 104 are fixedly sleeved on the surface of the diversion detection pipe 101. The inner lining layer 105 is fixedly connected to the inner wall of the diversion detection pipe 101. There are two detection coils 106, and the two detection coils 106 are fixedly installed on the surface of the moisture-proof sleeve 103. The two detection coils 106 are respectively a transmitting coil and a receiving coil. The distribution shell 107 is fixedly installed on the surface of the sealing sleeve shell 104. The display screen 108 is fixedly installed on the inner wall at the top of the distribution shell 107 to provide support and data display.
[0040] Among them; the centralized moisture-proof mechanism 2 includes a flow guide channel 201, a docking tube 202, an electrode head 203 and an insulating sleeve 204. The flow guide channel 201 is fixedly connected to the surface of the moisture-proof sleeve 103. There are two docking tubes 202, and the two docking tubes 202 are fixedly plugged into the surface of the flow guide channel 201. There are two groups of insulating sleeves 204, and the two groups of insulating sleeves 204 are fixedly plugged into the inside of the flow guide channel 201, and the two groups of insulating sleeves 204 are relatively distributed. There are two electrode heads 203, and the two electrode heads 203 are respectively fixedly connected to the inside of the two groups of insulating sleeves 204.
[0041] Among them; the centralized moisture-proof mechanism 2 also includes a liquid storage tank 205, an inner support plate 206, a liquid pump 207, a cover plate 208 and a liquid guide tube 209. The liquid storage tank 205 is fixedly installed on the surface of the sealing shell 104, the inner support plate 206 and the cover plate 208 are fixedly connected to the inner wall of the liquid storage tank 205, the liquid pump 207 is fixedly installed between the inner support plate 206 and the cover plate 208, and the liquid guide tube 209 is fixedly installed at the output end of the liquid pump 207 to facilitate the circulation of transformer oil and ensure that the seepage water can be centrally introduced into the filter box 210.
[0042] Among them; the centralized moisture-proof mechanism 2 also includes a filter box 210, a sealing plate 211 and a dust filter block 212, the filter box 210 is fixedly installed on the surface of the sealing shell 104, the sealing plate 211 is fixedly connected to the inner wall of the filter box 210, the dust filter block 212 is fixedly installed inside the filter box 210, and the interior of the filter box 210, the interior of the guide channel 201 and the interior of the liquid storage tank 205 are all filled with transformer oil, through the arrangement of the guide channel 201, the butt pipe 202, the electrode head 203, the insulating sleeve 204, the liquid storage tank 205, the inner support plate 206, the liquid pump 207, the cover plate 208, the liquid guide pipe 209, the filter box 210, the sealing plate 211 and the dust filter block 212, the transformer oil can be isolated to a certain extent, avoiding corrosion to the short circuit immediately after leakage, so that the accuracy of the device can be maintained until the inspection by the maintenance personnel.
[0043] Wherein: the leakage detection mechanism 3 includes an air cylinder 301, an observation window 302, an inner support ring 303, a piston 304, a sliding column 305, a compressed air spring 306, a pressure relief port 307, a sealing ring 308 and a sealing head 309, the air cylinder 301 is fixedly plugged into the top of the sealing plate 211, the observation window 302 is fixedly connected to the surface of the air cylinder 301, the inner support ring 303 is fixedly connected to the inner wall of the bottom end of the air cylinder 301, the piston 304 is slidably connected to the inside of the air cylinder 301, the sliding column 305 is fixedly plugged into the top of the piston 304, and the surface of the sliding column 305 is connected to the inner wall of the air cylinder 301. The air cylinder 301 is connected by sliding connection with the wall, and the air compression spring 306 is movably installed between the air cylinder 301 and the piston 304. The pressure relief port 307 is integrally arranged on one side of the air cylinder 301. The sealing ring 308 is fixedly connected to the inner wall of the pressure relief port 307, and the sealing head 309 is threadedly connected to the inside of the pressure relief port 307. Through the air cylinder 301, observation window 302, inner support ring 303, piston 304, sliding column 305, air compression spring 306, pressure relief port 307, sealing ring 308 and sealing head 309, the leakage signal can be converted into the extension and contraction signal of the sliding column 305, so that the personnel can detect it in time.
[0044] Among them; the external support mechanism 4 includes a first support flange 401, a second support flange 402, a first support arm 403, a second support arm 404 and a rubber ring 405. The first support flange 401 and the second support flange 402 are respectively fixedly installed at one end of the two connecting flanges 102 by bolts. The first support arm 403 is integrally arranged on the surface of the first support flange 401, and the second support arm 404 is fixedly installed on the surface of the second support flange 402. The rubber ring 405 is respectively fixedly installed on both sides of the first support flange 401 and both sides of the second support flange 402. Through the first support flange 401, the second support flange 402, the first support arm 403, the second support arm 404 and the rubber ring 405, support can be provided when the diversion detection pipeline 101 is replaced, avoiding the misalignment of the pipelines at both ends due to the disappearance of stress, and ensuring that there will be no misalignment during subsequent installation.
[0045] Among them; the external support mechanism 4 also includes a rubber block 406, a plug-in column 407 and a slide groove 408. The rubber block 406 is fixedly connected between the first support arm 403 and the second support arm 404. The plug-in column 407 is fixedly plugged into one end of the first support arm 403. The slide groove 408 is opened at one end of the second support arm 404, and the surface of the plug-in column 407 is slidably connected to the inner wall of the slide groove 408. The rubber block 406, the plug-in column 407 and the slide groove 408 are set so as to provide telescopic redundancy when the diversion detection pipeline 101 is replaced, so as to avoid the diversion detection pipeline 101 being stuck between the first support flange 401 and the second support flange 402.
[0046] Wherein; the circuit control mechanism 5 includes an empty pipe detection unit 501, an electrode interface and a signal amplifying unit 502, an MCU control unit 503 and a voltage signal ADC unit 504, the input end of the empty pipe detection unit 501 is signal-connected to the output end of the MCU control unit 503, and the output end of the empty pipe detection unit 501 is signal-connected to the input end of the MCU control unit 503, the output end of the electrode interface and the signal amplifying unit 502 is signal-connected to the input end of the voltage signal ADC unit 504, the output end of the voltage signal ADC unit 504 is signal-connected to the input end of the MCU control unit 503, and the electrode interface and the signal amplifying unit 502 are electrically connected to the two electrode heads 203 through a wire, the display screen 108 is electrically connected to the MCU control unit 503, when measuring the water flow rate, the MCU The control unit 503 controls the excitation and excitation state detection unit 505 to periodically send pulse signals. When a fluid with a certain conductivity flows through the pipeline, the fluid cuts the magnetic lines of force, and an induced electromotive force is generated at both ends of the electrode. The electrode interface and signal amplification unit 502 amplifies the induced electromotive force and outputs a voltage signal for the voltage signal ADC unit 504 to process and output a digital voltage signal. The processed digital voltage signal is then read by the MCU control unit 503 and further filtered and analyzed and calculated, so as to calculate the current water flow rate. When the water level decreases, the resistance between the two electrode heads 203 increases relative to the liquid. After the empty pipe detection unit 501 is assigned this signal by the MCU control unit 503, it amplifies the signal and then feeds it back to the MCU control unit 503 for reading and analysis.
[0047] Wherein; the circuit control mechanism 5 also includes an excitation and excitation state detection unit 505 and a power supply unit 506, the input end of the excitation and excitation state detection unit 505 is signal-connected to the output end of the MCU control unit 503, and the output end of the excitation and excitation state detection unit 505 is signal-connected to the input end of the MCU control unit 503, the output end of the power supply unit 506 is respectively electrically connected to the input end of the empty pipe detection unit 501, the input end of the electrode interface and the signal amplification unit 502, the input end of the MCU control unit 503, the input end of the voltage signal ADC unit 504 and the input end of the excitation and excitation state detection unit 505, and the input end of the power supply unit 506 is signal-connected to the output end of the MCU control unit 503, and the excitation and excitation state detection unit 505 is electrically connected to the detection coil 106. When detecting the state of the detection coil 106, the excitation and excitation state detection unit 505 will The on-off signal of the excitation coil is amplified into a voltage signal, and then the amplified voltage signal is fed back to the MCU control unit 503. The amplified voltage signal is then read and detected by the MCU control unit 503 to determine the short-circuit state of the excitation coil. The open-circuit state of the detection coil 106 can be detected by detecting the change in the output voltage of the operational amplifier U4. At the same time, when the detection coil 106 is in a non-open-circuit state, the short-circuit state of the detection coil 106 is detected by adding a voltage detection point. Since there is an equivalent resistance R0 when the detection coil 106 is turned on, the equivalent resistance generates a voltage drop when the detection coil 106 is turned on. Whether the detection coil 106 is in a short-circuit state is determined by analyzing the voltage at the detection point. The power supply unit 506 supplies power to the empty pipe detection unit 501, the electrode interface and signal amplification unit 502, the MCU control unit 503, the voltage signal ADC unit 504 and the excitation and excitation state detection unit 505.
[0048] Working principle: When in use, start the liquid pump 207, and the liquid pump 207 will continuously pump the transformer below upward, and the transformer oil will be pumped into the filter box 210 from the liquid guide pipe 209, and then filtered through the butt joint 202, and then penetrate from the filter box 210 to the inside of the guide channel 201 through the butt joint 202, and then pass through the guide channel 201 to the bottom of another butt joint 202. When passing through the guide channel 201, the transformer oil will take away some moisture that has infiltrated next to the electrode head 203 and form an isolation seal. The moisture will reach the bottom of another butt joint 202 with the transformer oil, and then enter the filter box 210, and then be pumped out. Pump 207 pumps water into the liquid guide tube 209 and then into the filter box 210. Since the density of water is greater than that of transformer oil and water is difficult to dissolve in transformer oil, the transformer oil will participate in the circulation again after being filtered, and the water will float above the transformer oil and remain and gather above the filter box 210. As the amount of leaked water increases, the water gathered inside the filter box 210 will gradually fill the air storage cylinder 301, accompanied by water vapor evaporated from the leaked water. These gas-liquid mixtures will push the piston 304 up, causing the sliding column 305 to rise. The higher the sliding column 305 rises, the more serious the leakage is, thereby prompting personnel to perform maintenance in time.
[0049] Specifically, during the operation of the electromagnetic water meter, various factors (such as aging of the electromagnetic coil, water quality problems, etc.) may cause the excitation system to have excessive internal resistance (hereinafter referred to as open circuit) or too little internal resistance (hereinafter referred to as short circuit), which will seriously affect the measurement accuracy and stability of the electromagnetic water meter. The present invention aims to achieve real-time monitoring and fault warning of the electromagnetic water meter excitation system, and improve the working efficiency and reliability of the electromagnetic water meter.
[0050] See also Figure 9-14 The excitation and excitation state detection unit 505 is controlled by the MCU control unit 503, and the pulse signal is periodically sent by the bridge U3 and the MOS tubes Q1 and Q2. The excitation coil is positively and reversely excited through the constant current unit composed of the operational amplifier U4 and the MOS tube Q3 through the excitation interface J2 to generate a magnetic field with a magnetic flux density of B (T). When a fluid with a certain conductivity, such as tap water with an average flow rate of V (m / s) flows through a pipe with an inner diameter of D (m), the water flow cuts the magnetic lines of force, and an induced electromotive force (E) is generated at both ends of the electrode. In the electrode interface and signal amplification unit 502, the induced electromotive force is input through the electrode interface J5, and after the low-pass filter network composed of resistors and capacitors, the instrument amplifier U12 amplifies the signal and outputs a voltage signal for the voltage signal ADC unit 504 to process and output a digital voltage signal. The processed digital voltage signal is then read by the MCU control unit 503 and further filtered and analyzed and calculated. According to the law of electromagnetic induction, E = B*D*V(V), volume flow rate q = π*D*D*V / 4(m 3 / s), we can get q = π*D*E / 4 / B(m 3 / s), so the electromotive force E=4*B*q / 4 / D(V), when B is a constant, π*D / 4 / B=k, q=π*D*E / 4 / B(m 3 / s) can be rewritten as q = kE (m 3 / s), thus, when the MCU control unit 503 obtains the digital voltage signal, the current water flow rate can be calculated.
[0051] Judgment of the open circuit and short circuit of the excitation coil. In the excitation and excitation state detection unit 505, when the excitation coil is open circuit, no current flows through the MOS tube during the excitation cycle, and the negative input P3 of the operational amplifier U4 is at a low level. At this time, the voltage comparator composed of the operational amplifier U4 outputs a high level V01 at the output terminal P4. When the excitation coil is connected or short-circuited, current flows through the MOS tube during the excitation cycle, and the current is stable. At this time, the negative input P3 of the operational amplifier U4 is a level voltage V02, and the output terminal P4 voltage of the operational amplifier U4 drops from the open circuit high level V01 to V03. Resistors R8 and R9 form a voltage divider network. The controller U10 in the MCU control unit 503 can determine the open circuit state of the excitation coil by detecting the voltage value of the voltage divider point "EXC_TEST1". To further determine the short circuit state of the excitation coil, it is necessary to detect the voltage change state of the pin P2 of the bridge U3 in the excitation and excitation state detection unit 505. When the excitation coil is open-circuited, in the positive excitation cycle, the voltage at pin P2 of the bridge U3 is V10, and in the negative excitation cycle, this point is a low-level voltage V11 due to the open circuit of the excitation coil; when the excitation coil is connected, in the positive excitation cycle, the voltage at pin P2 of the bridge U3 is V12, and in the negative excitation cycle, the voltage at this point is V13; when the excitation coil is short-circuited, in the positive and negative excitation cycles, the voltage at pin P2 of the bridge U3 is V14, and it is easy to deduce that V14=V12. There is an equivalent resistance R0 in the excitation coil, and because the operational amplifier U4 and the MOS tube Q3 form a constant current unit, the current value is I, and V14 is higher than V13 by the voltage drop voltage after the excitation coil is turned on, that is, V14-V13=R0*I. Combined with the judgment of the excitation coil on the open circuit, when the coil is not open circuit, the resistors R18 and R10 form a voltage divider network, and the controller U10 in the MCU control unit 503 can judge the short-circuit state of the excitation coil by detecting the voltage value of the voltage divider point "EXC_TEST2".
[0052] The change of the voltage value of the key point in the excitation and excitation state detection unit 505 is analyzed to determine the open circuit and short circuit state of the excitation coil. The open circuit state of the excitation coil can be detected by detecting the change of the output voltage of the operational amplifier U4. At the same time, when the excitation coil is in a non-open circuit state, the short circuit state of the coil is detected by adding a voltage detection point. Since there is an equivalent resistance R0 when the coil is turned on, the equivalent resistance generates a voltage drop when the coil is turned on. By analyzing the voltage of the detection point, it is determined whether the coil is in a short circuit state.
[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An electromagnetic water meter, characterized in that: include: A flow guide support mechanism (1), wherein a centralized moisture isolation mechanism (2) is fixedly installed inside the flow guide support mechanism (1), a leakage detection mechanism (3) is arranged on the top of the centralized moisture isolation mechanism (2), an external support mechanism (4) is arranged on the surface of the flow guide support mechanism (1), and a circuit control mechanism (5) is arranged inside the flow guide support mechanism (1).
2. An electromagnetic water meter according to claim 1, characterized in that: The flow guide support mechanism (1) comprises a flow guide detection pipeline (101), a connecting flange (102), a moisture-proof sleeve (103), a sealing sleeve shell (104), an inner lining layer (105), a detection coil (106), a power distribution shell (107) and a display screen (108); the connecting flange (102) is integrally arranged on both sides of the flow guide detection pipeline (101); the moisture-proof sleeve (103) and the sealing sleeve shell (104) are both fixedly sleeved on the flow guide detection pipeline (101). The inner lining layer (105) is fixedly connected to the inner wall of the flow detection pipe (101); the number of the detection coils (106) is two, and the two detection coils (106) are fixedly mounted on the surface of the moisture-proof sleeve (103); the two detection coils (106) are respectively a transmitting coil and a receiving coil; the power distribution shell (107) is fixedly mounted on the surface of the sealing sleeve (104); and the display screen (108) is fixedly mounted on the inner wall of the top of the power distribution shell (107).
3. An electromagnetic water meter according to claim 2, characterized in that: The centralized moisture-proof mechanism (2) comprises a flow guide (201), a butt-joint pipe (202), an electrode head (203) and an insulating sleeve (204); the flow guide (201) is fixedly connected to the surface of the moisture-proof sleeve (103); there are two butt-joint pipes (202), and both butt-joint pipes (202) are fixedly plugged into the surface of the flow guide (201); there are two groups of insulating sleeves (204), and both groups of insulating sleeves (204) are fixedly plugged into the interior of the flow guide (201), and the two groups of insulating sleeves (204) are relatively distributed; there are two electrode heads (203), and both electrode heads (203) are fixedly connected to the interior of the two groups of insulating sleeves (204), respectively.
4. An electromagnetic water meter according to claim 3, characterized in that: The centralized moisture-proof mechanism (2) further comprises a liquid storage tank (205), an inner support plate (206), a liquid extraction pump (207), a cover plate (208) and a liquid guide tube (209); the liquid storage tank (205) is fixedly mounted on the surface of the sealing casing (104); the inner support plate (206) and the cover plate (208) are both fixedly connected to the inner wall of the liquid storage tank (205); the liquid extraction pump (207) is fixedly mounted between the inner support plate (206) and the cover plate (208); and the liquid guide tube (209) is fixedly mounted on the output end of the liquid extraction pump (207).
5. An electromagnetic water meter according to claim 4, characterized in that: The centralized moisture-proof mechanism (2) further comprises a filter box (210), a sealing plate (211) and a dust filter block (212); the filter box (210) is fixedly mounted on the surface of the sealing casing (104); the sealing plate (211) is fixedly connected to the inner wall of the filter box (210); the dust filter block (212) is fixedly mounted inside the filter box (210); and the inside of the filter box (210), the inside of the flow guide channel (201) and the inside of the liquid storage tank (205) are all filled with transformer oil.
6. An electromagnetic water meter according to claim 5, characterized in that: The leakage detection mechanism (3) comprises an air storage cylinder (301), an observation window (302), an inner support ring (303), a piston (304), a sliding column (305), a compressed air spring (306), a pressure relief port (307), a sealing ring (308) and a sealing head (309); the air storage cylinder (301) is fixedly plugged into the top of the sealing plate (211); the observation window (302) is fixedly connected to the surface of the air storage cylinder (301); the inner support ring (303) is fixedly connected to the inner wall of the bottom end of the air storage cylinder (301); the piston (304) is slidingly connected to the inner wall of the bottom end of the air storage cylinder (301); and the piston (304) is slidingly connected to the inner wall of the bottom end of the air storage cylinder (301). The piston (304) is movably connected to the inside of the air storage cylinder (301), the sliding column (305) is fixedly inserted on the top of the piston (304), and the surface of the sliding column (305) is slidably connected to the inner wall of the air storage cylinder (301), the compressed air spring (306) is movably installed between the air storage cylinder (301) and the piston (304), the pressure relief port (307) is integrally arranged on one side of the air storage cylinder (301), the sealing ring (308) is fixedly connected to the inner wall of the pressure relief port (307), and the sealing head (309) is threadedly connected to the inside of the pressure relief port (307).
7. An electromagnetic water meter according to claim 2, characterized in that: The external support mechanism (4) comprises a first support flange (401), a second support flange (402), a first support arm (403), a second support arm (404) and a rubber ring (405); the first support flange (401) and the second support flange (402) are respectively fixedly mounted on one end of two connecting flanges (102) by bolts; the first support arm (403) is integrally arranged on the surface of the first support flange (401); the second support arm (404) is fixedly mounted on the surface of the second support flange (402); and the rubber ring (405) is respectively fixedly mounted on both sides of the first support flange (401) and both sides of the second support flange (402).
8. An electromagnetic water meter according to claim 7, characterized in that: The external support mechanism (4) further comprises a rubber block (406), a plug-in column (407) and a slide groove (408); the rubber block (406) is fixedly connected between the first support arm (403) and the second support arm (404); the plug-in column (407) is fixedly plugged into one end of the first support arm (403); the slide groove (408) is provided at one end of the second support arm (404); and the surface of the plug-in column (407) is slidably connected to the inner wall of the slide groove (408).
9. An electromagnetic water meter according to claim 3, characterized in that: The circuit control mechanism (5) comprises an empty pipe detection unit (501), an electrode interface and a signal amplifying unit (502), an MCU control unit (503) and a voltage signal ADC unit (504); the input end of the empty pipe detection unit (501) is signal-connected to the output end of the MCU control unit (503), and the output end of the empty pipe detection unit (501) is signal-connected to the input end of the MCU control unit (503); the output end of the electrode interface and the signal amplifying unit (502) is signal-connected to the input end of the voltage signal ADC unit (504), and the output end of the voltage signal ADC unit (504) is signal-connected to the input end of the MCU control unit (503); the electrode interface and the signal amplifying unit (502) are electrically connected to the two electrode heads (203) via a wire, and the display screen (108) is electrically connected to the MCU control unit (503).
10. An electromagnetic water meter according to claim 9, characterized in that: The circuit control mechanism (5) further comprises an excitation and excitation state detection unit (505) and a power supply unit (506); the input end of the excitation and excitation state detection unit (505) is signal-connected to the output end of the MCU control unit (503); the output end of the excitation and excitation state detection unit (505) is signal-connected to the input end of the MCU control unit (503); the output end of the power supply unit (506) is electrically connected to the input end of the empty pipe detection unit (501), the input end of the electrode interface and signal amplification unit (502), the input end of the MCU control unit (503), the input end of the voltage signal ADC unit (504) and the input end of the excitation and excitation state detection unit (505); the input end of the power supply unit (506) is signal-connected to the output end of the MCU control unit (503); and the excitation and excitation state detection unit (505) is electrically connected to the detection coil (106).