Electromagnetic flowmeter for large-diameter closed circulation pipeline

Abstract

The utility model discloses an electromagnetic flowmeter for a large-caliber closed circulation pipeline, which comprises a measuring mechanism, the measuring mechanism comprises a first measuring pipe, one side of the first measuring pipe is fixedly provided with a calibration mechanism, and the left end and the right end of the first measuring pipe are both fixedly connected with a connecting mechanism. First electromagnetic valves are fixedly installed on the left side and the right side of the first measuring pipe, the calibration mechanism comprises a second measuring pipe, the second measuring pipe is fixedly connected to one side of the first measuring pipe, the flow of liquid in the first measuring pipe is detected through the measuring mechanism, and when the liquid flows in the second measuring pipe, a magnet is driven to rotate, and the first electromagnetic valves are driven to rotate. In the rotating process of the magnet, when each set of blades pass through the bottom of the picking unit, electromagnetic pulses are generated and received by the picking unit, the liquid flow is obtained through analysis, and due to the fact that the internal flow of the first measuring pipe is consistent with the internal flow of the second measuring pipe, the measuring mechanism can be calibrated by comparing data obtained by the calibration mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic flowmeters, in particular to an electromagnetic flowmeter for a large-caliber closed circulation pipeline. Background Art

[0002] Electromagnetic flowmeter is a meter that uses the principle of electromagnetic induction to measure the flow of conductive fluids (such as water, acid, alkali, salt solution, etc.). This type of flowmeter quickly emerged with the development of electronic technology in the 1950s and 1960s. It is one of the commonly used flow measurement tools in the field of modern industrial automation. Its working principle is based on Faraday's law of electromagnetic induction, that is, when a conductive medium flows in a uniform magnetic field, it will generate an induced electromotive force in a direction perpendicular to the fluid flow direction and the magnetic field due to cutting the magnetic lines of force. The magnitude of this electromotive force is proportional to the average flow velocity of the fluid.

[0003] In the prior art, during long-term use of electromagnetic flowmeters, the internal electronic components (such as amplifiers, analog-to-digital converters, etc.) may experience performance drift due to factors such as temperature, humidity, and aging, affecting the measurement accuracy. Regular calibration is required to detect and correct this drift.

[0004] After searching the prior art, it is found that electromagnetic flowmeters usually require professionals to use professional equipment to measure and calibrate the electromagnetic flowmeter. They cannot self-check and are highly dependent on external calibration. More frequent manual intervention is required to ensure the reliability of the measurement, which undoubtedly increases the labor and equipment usage costs. Summary of the invention

[0005] The purpose of the utility model is to provide an electromagnetic flowmeter for a large-diameter closed-loop pipeline, which has the advantage of self-calibration and solves the problems of being unable to self-check, being highly dependent on external calibration, requiring more frequent manual intervention to ensure measurement reliability, and having high labor and equipment use costs.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an electromagnetic flowmeter for a large-diameter closed-loop pipeline, comprising a measuring mechanism, the measuring mechanism comprising a first measuring tube, a calibration mechanism fixedly installed on one side of the first measuring tube, a connecting mechanism fixedly connected to both left and right ends of the first measuring tube, a first solenoid valve fixedly installed on both left and right sides of the first measuring tube, the calibration mechanism comprising a second measuring tube, the second measuring tube fixedly connected to one side of the first measuring tube, a rotor rotatably installed inside the second measuring tube, a pickup unit fixedly installed on the top of the rotor, and a circulating pump fixedly installed inside the second measuring tube.

[0007] As a preferred electromagnetic flowmeter for a large-diameter closed-loop pipeline of the utility model, a mounting shell is fixedly installed on the outer wall of the first measuring tube, an excitation coil is fixedly installed inside the mounting shell, the excitation coil is sleeved and installed on the outer wall of the first measuring tube, and a detection module is fixedly installed on the top of the mounting shell.

[0008] As a preferred embodiment of the electromagnetic flowmeter for a large-caliber closed-circulation pipeline of the utility model, second electromagnetic valves are fixedly installed on both left and right ends of the second measuring tube.

[0009] As a preferred embodiment of the electromagnetic flowmeter for a large-caliber closed-loop pipeline of the utility model, a plurality of magnets are fixedly mounted on the surface of the rotor.

[0010] As a preferred embodiment of the electromagnetic flowmeter for a large-diameter closed-circulation pipeline of the utility model, the connecting mechanism includes a flange, a rubber gasket is fixedly installed on one side of the flange, and a grounding screw is threadedly connected to the top of the flange.

[0011] As a preferred embodiment of the electromagnetic flowmeter for a large-caliber closed-circulation pipeline of the utility model, the inner walls of the flange, the first measuring tube and the second measuring tube are all fixedly installed with ceramic linings.

[0012] As a preferred embodiment of the electromagnetic flowmeter for a large-caliber closed-circulation pipeline of the utility model, a display panel is fixedly mounted on one side of the detection module.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model closes the first solenoid valve to form a closed pipeline between the first measuring tube and the second measuring tube, and drives the liquid to flow inside the second measuring tube and the first measuring tube through a circulating pump. In this process, the flow rate of the liquid inside the first measuring tube is detected by the measuring mechanism, and when the liquid flows inside the second measuring tube, it drives the magnet to rotate. When each group of blades of the magnet passes through the bottom of the picking unit during rotation, an electromagnetic pulse is generated and received by the picking unit. The faster the rotor speed, the faster the electromagnetic pulse frequency received by the picking unit, and then the liquid flow rate is obtained by analyzing the electromagnetic pulse frequency. Because the flow rates inside the first measuring tube and the second measuring tube are consistent, the measuring mechanism can be calibrated by comparing the data obtained by the calibration mechanism. It has the advantage of self-calibration, solves the problems of being unable to self-check, high dependence on external calibration, more frequent manual intervention to ensure measurement reliability, and high labor and equipment use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the measuring mechanism of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the calibration mechanism of the utility model;

[0017] Figure 4 It is a structural schematic diagram of the connection mechanism of the utility model.

[0018] In the figure: 1. Measuring mechanism; 101. First measuring tube; 102. Mounting shell; 103. Excitation coil; 104. Detection module; 105. Display panel; 106. First solenoid valve; 2. Calibration mechanism; 201. Second measuring tube; 202. Rotor; 203. Pick-up unit; 204. Circulation pump; 205. Second solenoid valve; 206. Magnet; 3. Connecting mechanism; 301. Flange; 302. Rubber gasket; 303. Grounding screw; 304. Ceramic lining. DETAILED DESCRIPTION

[0019] See also Figure 1-4 , an electromagnetic flowmeter for a large-diameter closed circulation pipeline, comprising a measuring mechanism 1, the measuring mechanism 1 comprising a first measuring tube 101, a calibration mechanism 2 is fixedly installed on one side of the first measuring tube 101, both left and right ends of the first measuring tube 101 are fixedly connected with a connecting mechanism 3, both left and right sides of the first measuring tube 101 are fixedly installed with a first electromagnetic valve 106, the calibration mechanism 2 comprises a second measuring tube 201, the second measuring tube 201 is fixedly connected to one side of the first measuring tube 101, a rotor 202 is rotatably installed inside the second measuring tube 201, a pickup unit 203 is fixedly installed on the top of the rotor 202, and a circulating pump 204 is fixedly installed inside the second measuring tube 201;

[0020] During use, the first electromagnetic valve 106 is closed to form a closed pipeline between the first measuring tube 101 and the second measuring tube 201, and the circulating pump 204 drives the liquid to flow inside the second measuring tube 201 and the first measuring tube 101. In this process, the flow rate of the liquid inside the first measuring tube 101 is detected by the measuring mechanism 1, and when the liquid flows inside the second measuring tube 201, it drives the magnet 206 to rotate. When each set of blades of the magnet 206 passes the bottom of the pickup unit 203 during rotation, an electromagnetic pulse is generated and received by the pickup unit 203. The faster the rotation speed of the rotor 202, the faster the electromagnetic pulse frequency received by the pickup unit 203. Then, the liquid flow rate is obtained by analyzing the electromagnetic pulse frequency. Because the internal flow rates of the first measuring tube 101 and the second measuring tube 201 are consistent, the measuring mechanism 1 can be calibrated by comparing the data obtained by the calibration mechanism 2. It has the advantage of self-calibration, solves the problems of being unable to self-check, high dependence on external calibration, more frequent manual intervention to ensure the reliability of measurement, and high labor and equipment use costs.

[0021] Furthermore, a mounting shell 102 is fixedly mounted on the outer wall of the first measuring tube 101, an excitation coil 103 is fixedly mounted inside the mounting shell 102, the excitation coil 103 is sleeved and mounted on the outer wall of the first measuring tube 101, and a detection module 104 is fixedly mounted on the top of the mounting shell 102;

[0022] During use, a stable magnetic field is generated around the first measuring tube 101 through the excitation coil 103. This magnetic field is usually uniform and perpendicular to the expected fluid flow direction. When a conductive fluid such as water or electrolyte solution flows in the magnetic field of the excitation coil 103, the charged particles in the fluid will be deflected due to the Lorentz force, thereby generating an induced electromotive force proportional to the flow velocity in the direction perpendicular to the fluid flow direction and the magnetic field. The induced electromotive force is received and converted by the detection module 104, and then analyzed to finally obtain specific flow data.

[0023] Furthermore, second solenoid valves 205 are fixedly installed at both left and right ends of the second measuring tube 201;

[0024] During use, the second solenoid valve 205 is used to control the opening and closing of the internal pipeline of the second measuring tube 201. In the non-calibration state, the internal passage of the second measuring tube 201 is closed, so that the calibration mechanism 2 is in a standby state and is only opened during calibration, thereby reducing the use time of the calibration mechanism 2 and the failure rate of the calibration mechanism 2, thereby increasing the accuracy of the calibration mechanism 2 during calibration.

[0025] Furthermore, a plurality of magnets 206 are fixedly mounted on the surface of the rotor 202;

[0026] During use, the magnet 206 amplifies the electrical signal when the blades of the rotor 202 come into contact with the pickup unit 203, so that the measurement result of the calibration mechanism 2 is more accurate.

[0027] Furthermore, the connection mechanism 3 includes a flange 301, a rubber gasket 302 is fixedly mounted on one side of the flange 301, and a grounding screw 303 is threadedly connected to the top of the flange 301;

[0028] During use, the device is connected to the circulation pipeline through the flange 301, and the sealing performance of the flange 301 is increased through the rubber gasket 302. At the same time, the electrical signal of the external environment is prevented from being transmitted to the first measuring tube 101 through the flange 301, thereby reducing electromagnetic interference and improving the accuracy of the detection of the measuring mechanism 1. The housing of the device is connected to the ground through the grounding screw 303 to form a low-impedance path, which helps to guide the external electromagnetic interference current to flow directly to the ground instead of flowing through the measurement circuit, thereby protecting the measurement signal from interference and maintaining the accuracy and stability of the measurement.

[0029] Furthermore, the inner walls of the flange 301, the first measuring tube 101, and the second measuring tube 201 are all fixedly mounted with ceramic linings 304;

[0030] During use, the ceramic lining 304 ensures the insulation between the electrode and the fluid, avoids the interference of electrochemical reaction on the measurement signal, improves the measurement accuracy and stability of the flow meter, and effectively resists the corrosion of most acids, alkalis and salt solutions. It is especially suitable for measuring highly corrosive media such as chemical raw materials, waste water, etc., and extends the service life of the flow meter.

[0031] Furthermore, a display panel 105 is fixedly mounted on one side of the detection module 104;

[0032] During use, the flow data is intuitively displayed through the display panel 105, which is convenient for the staff to grasp in real time.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electromagnetic flowmeter for a large-caliber closed-loop pipeline, comprising a measuring mechanism (1), the measuring mechanism (1) comprising a first measuring tube (101), a calibration mechanism (2) being fixedly mounted on one side of the first measuring tube (101), connecting mechanisms (3) being fixedly connected to both left and right ends of the first measuring tube (101), and first electromagnetic valves (106) being fixedly mounted on both left and right sides of the first measuring tube (101), characterized in that: The calibration mechanism (2) comprises a second measuring tube (201), the second measuring tube (201) being fixedly connected to one side of the first measuring tube (101), a rotor (202) being rotatably mounted inside the second measuring tube (201), a pickup unit (203) being fixedly mounted on the top of the rotor (202), and a circulating pump (204) being fixedly mounted inside the second measuring tube (201).

2. The electromagnetic flowmeter for a large-caliber closed-loop pipeline according to claim 1, characterized in that: A mounting shell (102) is fixedly mounted on the outer wall of the first measuring tube (101), an excitation coil (103) is fixedly mounted inside the mounting shell (102), the excitation coil (103) is sleeved and mounted on the outer wall of the first measuring tube (101), and a detection module (104) is fixedly mounted on the top of the mounting shell (102).

3. The electromagnetic flowmeter for a large-caliber closed-loop pipeline according to claim 1, characterized in that: Second solenoid valves (205) are fixedly mounted on both left and right ends of the second measuring tube (201).

4. The electromagnetic flowmeter for a large-caliber closed-loop pipeline according to claim 1, characterized in that: A plurality of magnets (206) are fixedly mounted on the surface of the rotor (202).

5. The electromagnetic flowmeter for a large-caliber closed-loop pipeline according to claim 1, characterized in that: The connection mechanism (3) comprises a flange (301), a rubber gasket (302) is fixedly mounted on one side of the flange (301), and a grounding screw (303) is threadedly connected to the top of the flange (301).

6. The electromagnetic flowmeter for a large-caliber closed-circuit pipeline according to claim 5, characterized in that: The inner walls of the flange (301), the first measuring tube (101) and the second measuring tube (201) are all fixedly mounted with a ceramic lining (304).

7. The electromagnetic flowmeter for a large-caliber closed-loop pipeline according to claim 2, characterized in that: A display panel (105) is fixedly mounted on one side of the detection module (104).

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