Non-full pipe electromagnetic flowmeter
By optimizing the design of the excitation assembly and ultrasonic probe in the electromagnetic flowmeter, the accuracy problem of flow measurement under non-full pipe conditions is solved, realizing high-precision flow measurement and multi-functional communication, suitable for various environments.
Patent Information
- Application Number
- CN202422883672.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Existing electromagnetic flowmeters cannot accurately measure fluid flow in non-full pipe conditions, especially in open channel applications and municipal drainage scenarios where they fail to meet metering requirements.
A non-full-pipe electromagnetic flowmeter was designed, which uses an excitation component and an ultrasonic probe set at a specific angle, combined with a measurement circuit board and a display circuit board. The flow velocity is measured by the excitation component and the liquid level is detected by the ultrasonic probe. The flow area is calculated to achieve flow measurement.
It achieves high-precision flow measurement in non-full pipe conditions, has an IP68 protection rating, supports multiple communication functions, is suitable for water immersion environments, and can display flow data on-site or remotely.
Smart Images
Figure CN223538366U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flow measurement applications, specifically to a non-full pipe electromagnetic flowmeter that facilitates the measurement of fluid volume flow rate in a non-full pipe state. Background Technology
[0002] Electromagnetic flow meters, as a type of flow instrument with high measurement accuracy, are widely used in municipal water supply, sewage treatment, agricultural irrigation, steel, and chemical industries due to their stable metering effect and high measurement accuracy. With the development of niche markets, in some open channel applications, municipal drainage, and wastewater discharge scenarios where full-pipe metering requirements cannot be met, ordinary electromagnetic flow meters, which can only measure the medium in a closed pipe, cannot accurately measure the actual flow rate. Currently, Doppler ultrasonic flow meters and other products are widely used, typically with square, trapezoidal, or Parshall flume flow cross-sections. Flow meters are also used in cylindrical pipes where the flow is not full. Based on this, we have developed a new electromagnetic flow meter product that accurately measures the liquid level in non-full pipes. It uses the principle of electromagnetic flow meters to detect the flow velocity of the flowing liquid and calculates the actual flow rate through an algorithm. This product has a simple structure, is easy to install, has high stability, and facilitates on-site readings and remote meter readings for customers. Summary of the Invention
[0003] The purpose of this invention is to provide a non-full-pipe electromagnetic flowmeter, which is mainly suitable for measuring conductive liquids in a closed pipe in a non-full-pipe state.
[0004] To achieve the above objectives, the technical solution of this utility model is as follows:
[0005] A non-full-pipe electromagnetic flowmeter, comprising a sensor section and a converter section, including a flange, a guide pipe, an excitation assembly, an ultrasonic probe, a probe base, a probe locking cover, a measuring circuit board, a converter housing, a sealing gasket, and a display circuit board, characterized in that:
[0006] The excitation assembly includes two measuring electrodes, an excitation coil, pole shoes, and a magnetic yoke;
[0007] The two sets of excitation components are respectively located on both sides of the guide tube, with the angle between them and the middle plane being between 30° and 40°.
[0008] The angle between the center lines of the two sets of measuring electrodes in the excitation assembly is 60-80°.
[0009] The guide tube is lined with a rubber liner;
[0010] The converter housing is fixed above the sensor and fixed to the sensor connector.
[0011] The ultrasonic probe is mounted and fixed on the probe base, with a sealing ring between them;
[0012] The probe locking cover presses against the ultrasonic probe, and a rubber pad is provided between the two.
[0013] The ultrasonic probe's field of view can be directly seen through the cone hole in the probe base, allowing direct visualization of the medium inside the pipe.
[0014] The measuring circuit board and the display circuit board are fixed inside the conversion housing with screws;
[0015] In the excitation assembly, the excitation wire and electrode wire are connected to the base of the measuring plate via a plug.
[0016] The beneficial effects of this utility model are:
[0017] (1) This utility model is a non-full pipe electromagnetic flow meter with optimized measurement magnetic circuit, ultrasonic probe to collect liquid level height, and calculate the flow area, resulting in high measurement accuracy.
[0018] (2) This utility model is a non-full-pipe electromagnetic flow meter with an integrated IP68 protection rating design, which can be used in water immersion and other occasions.
[0019] (3) The present invention provides a non-full-pipe electromagnetic flow meter, which can be equipped with RS485, 4G, NB-IOT and other communication functions, upload the flow signal to the platform, and can also be displayed locally or remotely. Attached Figure Description
[0020] Appendix Figure 1 This is a schematic diagram of the structure of a non-full-pipe electromagnetic flowmeter according to the present invention.
[0021] Appendix Figure 2 This is a cross-sectional view of the structure of a non-full-pipe electromagnetic flowmeter according to the present invention. Detailed Implementation
[0022] The technical solution of this utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0023] As attached Figure 1 and in conjunction with the appendix Figure 2 As shown: A non-full-pipe electromagnetic flowmeter consists of a sensor part (2) and a converter part (1), including a flange (11), a guide pipe (4), an excitation assembly (3), an ultrasonic probe (6), a probe base (5), a probe locking cover (15), a measuring circuit board (7), a converter housing (16), a sealing gasket, a locking nut, a display circuit board (8), and a sensor cover plate (12).
[0024] The excitation assembly includes two measuring electrodes (10), an excitation coil (9), pole shoes, and a magnetic yoke. The two sets of excitation assemblies are respectively located on both sides of the guide tube, with an angle between them and the central plane of 30-40°, enabling the measurement of fluid media exceeding one-quarter of its cross-sectional area. The center lines of the two sets of measuring electrodes in the excitation assembly are angled at 60-80°. The low resistance of the excitation coil contributes to reducing the overall power consumption.
[0025] The guide tube is lined with rubber and has a smooth surface, making it less prone to scale buildup.
[0026] The converter housing is fixed above the sensor and on the sensor connector (13). The excitation wire (9) and electrode wire of the electromagnetic sensor are connected through the internal cavity and the converter circuit board assembly. The whole machine has good sealing performance, a straight-through structure, and extremely low pressure loss.
[0027] The ultrasonic probe is mounted and fixed on the probe base, with a sealing ring between them. The probe locking cap presses the ultrasonic probe firmly, and a rubber gasket is placed between them. The ultrasonic probe's field of view can be directly observed through the cone hole of the probe base to view the medium inside the pipe. Specifically, the ultrasonic probe is mounted on the ultrasonic probe base, and the probe is pressed firmly by the probe locking cap, with a rubber gasket in between. O-rings are provided on the probe and the base, providing a double-layer seal. After the probe is prepared, soft sealant is poured into the cavity of the probe base to effectively ensure the sealing of the entire machine and its internal components. The ultrasonic probe's field of view can be directly observed through the cone hole of the base to view the medium inside the pipe. The height is set according to the requirements of the ultrasonic probe, generally with the probe end face at least 60mm away from the highest point of the liquid.
[0028] The measuring circuit board and display circuit board are fixed inside the converter housing with screws; the excitation wires and electrode wires in the excitation assembly are connected to the base of the measuring board via plugs. Specifically, the measuring circuit board assembly and display board assembly are modularly assembled, installed inside the converter housing, and fixed to the converter housing with screws. The sensor excitation wires and electrode wires are connected to the base of the measuring board via plugs. The remote transmission module is integrated into the measuring circuit and can be connected to a split-screen display via a communication cable or used directly for data output. It can output RS485 signals, 4G signals, and NB-IoT signals. The display board assembly has an LCD screen for local reading of flow signals.
Claims
1. A non-full-pipe electromagnetic flowmeter, comprising a sensor section and a converter section, including a flange, a flow guide pipe, an excitation assembly, an ultrasonic probe, a probe base, a probe locking cover, a measuring circuit board, a converter housing, a sealing gasket, and a display circuit board, characterized in that: The excitation assembly includes two measuring electrodes, an excitation coil, pole shoes, and a magnetic yoke; The two sets of excitation components are respectively located on both sides of the guide tube, with an angle between them and the middle plane of 30° to 40°; the center lines of the two sets of measuring electrodes in the excitation components are installed at an angle of 60° to 80°. The guide tube is lined with a rubber liner; The converter housing is fixed above the sensor and fixed to the sensor connector. The ultrasonic probe is mounted and fixed on the probe base, with a sealing ring between them; The probe locking cover presses against the ultrasonic probe, and a rubber pad is provided between the two. The ultrasonic probe's field of view can be directly seen through the cone hole in the probe base, allowing direct visualization of the medium inside the pipe. The measuring circuit board and the display circuit board are fixed inside the conversion housing with screws; In the excitation assembly, the excitation wire and electrode wire are connected to the base of the measuring plate via a plug.