A multi-hole electromagnetic flowmeter

Abstract

The utility model is suitable for the technical field of electromagnetic flowmeter, provides a kind of porous electromagnetic flowmeter, including measuring tube, the middle part of the inner chamber of measuring tube is fixedly connected with porous balance throttling member, the lower surface of measuring tube and located the both ends of porous balance throttling member are respectively vertically communicated with upstream pressure lead pipe and downstream pressure tapping pipe. The porous electromagnetic flowmeter, by setting porous balance throttling member, upstream pipeline structure and downstream pipeline structure, the structure of the device adapts the trend that society pays more and more attention to the energy metering control more and more strictly, can satisfy the measurement of large-diameter, large-flow conducting fluid flow;Meanwhile, the device requires short, permanent pressure loss small, energy-saving effect good to the straight pipe section of measuring section, the device also has integrated design, compact structure, is convenient for field installation, maintenance, can display, remote output flow signal in situ, it is convenient for user to carry out data analysis, improve technology, improve production efficiency, reduce cost, adapt to energy social control requirement.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic flowmeter technology, and in particular relates to a multi-hole electromagnetic flowmeter. Background Technology

[0002] An electromagnetic flowmeter is a flow measurement instrument designed based on Faraday's law of electromagnetic induction. It is mainly used to measure the volumetric flow rate of conductive liquids and slurries in closed pipes. The core principle of the electromagnetic flowmeter is Faraday's law of electromagnetic induction: when a conductive fluid flows in a magnetic field, an induced electromotive force proportional to the flow velocity is generated. The sensor part generates a magnetic field through an excitation coil, electrodes detect the electrical signal generated by the fluid cutting magnetic lines of force, and the converter processes the signal into flow data.

[0003] Traditional flange-type electromagnetic flowmeters are generally suitable for measuring small to medium diameter conductive fluids. Considering cost, installation, and maintenance, it is generally recommended that the diameter not exceed DN600. For measuring the flow of large-diameter, high-flow conductive fluids, insertion-type electromagnetic flowmeters are usually selected, but their measurement accuracy is relatively low. The standards and regulations used in the manufacturing of related products are mostly self-compiled documents by the companies. In addition, due to their structural characteristics, some metal parts come into contact with the fluid, resulting in insufficient corrosion resistance.

[0004] Therefore, it is necessary to provide a composite shoe spike that maintains elasticity at low temperatures to solve the above-mentioned technical problems. Utility Model Content

[0005] This utility model provides a multi-hole electromagnetic flow meter, which aims to solve the problems of low measurement accuracy of traditional flange-type electromagnetic flow meters, the fact that the standards and regulations on which related products are manufactured are mostly self-compiled documents by enterprises, and the fact that due to its structural characteristics, some metal parts are in contact with the fluid, resulting in insufficient corrosion resistance.

[0006] This utility model is implemented as follows: a multi-hole electromagnetic flowmeter includes a measuring tube. A multi-hole balancing throttling device is fixedly connected to the middle of the inner cavity of the measuring tube. An upstream pressure tapping pipe and a downstream pressure tapping pipe are vertically connected to the lower surface of the measuring tube and at both ends of the multi-hole balancing throttling device, respectively. An upstream pipeline structure and a downstream pipeline structure are respectively provided at the bottom ends of the upstream pressure tapping pipe and the downstream pressure tapping pipe. The electromagnetic flowmeter body is arranged between the upstream pipeline structure and the downstream pipeline structure.

[0007] Preferably, both ends of the outer surface of the measuring tube are fixedly connected to a first flange.

[0008] Preferably, the upstream pipeline structure includes an upstream connecting pipe that is vertically connected to the bottom end of the upstream pressure pipe, and the other end of the upstream connecting pipe is bent backward and fixedly connected to a second flange.

[0009] Preferably, the downstream pipeline structure includes a downstream connecting pipe vertically connected to the bottom end of the downstream pressure tapping pipe, the bottom end of the downstream connecting pipe is connected to a tee, the other two connecting ports of the tee are connected to short connecting pipes, the other ends of the two short connecting pipes are respectively fixedly connected to a third flange and a drain valve, and a shut-off valve is provided on the downstream connecting pipe and located between the downstream pressure tapping pipe and the tee.

[0010] Preferably, the magnetic flowmeter body is installed between the upstream pipeline structure and the downstream pipeline structure via the second flange and the third flange.

[0011] Preferably, a flow-limiting orifice plate is provided at the outlet end of the electromagnetic flowmeter body.

[0012] Beneficial effects

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model provides a multi-hole electromagnetic flowmeter. By setting up a multi-hole balancing throttling device, an upstream pipeline structure, and a downstream pipeline structure, the structure of this device adapts to the increasingly stringent social trend of energy metering and control, and can meet the measurement of large-diameter, high-flow-rate conductive fluids. At the same time, the device requires a short straight pipe section in the measurement section, has low permanent pressure loss, and good energy-saving effect. The device also features an integrated design, a compact structure, and is easy to install and maintain on site. It can display the flow signal locally and transmit it remotely, facilitating data analysis, process improvement, increased production efficiency, and reduced costs for users, thus meeting the requirements of social energy management. Attached Figure Description

[0014] Figure 1 This is a schematic cross-sectional view of the pipeline section of this utility model; Figure 2 This is a schematic diagram of the porous balanced throttling device in this utility model; Figure 3 This is a schematic diagram of the flow-limiting orifice plate in this utility model.

[0015] In the diagram: 1-Measuring tube, 2-Multi-hole balancing throttling device, 3-Upstream pressure tapping pipe, 4-Downstream pressure tapping pipe, 5-First flange, 6-Upstream connecting pipe, 7-Second flange, 8-Downstream connecting pipe, 9-Stop valve, 10-Tee, 11-Short connecting pipe, 12-Third flange, 13-Drain valve, 14-Flow limiting orifice plate, 15-Electromagnetic flowmeter body. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] Please see Figure 1 , Figure 2 and Figure 3 ,in Figure 1 This is a schematic cross-sectional view of the pipeline section of this utility model; Figure 2 This is a schematic diagram of the porous balanced throttling device in this utility model; Figure 3 This is a schematic diagram of the flow-limiting orifice plate in this utility model.

[0018] A multi-hole electromagnetic flowmeter includes a measuring tube 1. A multi-hole balancing throttling device 2 is fixedly connected to the middle of the inner cavity of the measuring tube 1. An upstream pressure tapping pipe 3 and a downstream pressure tapping pipe 4 are vertically connected to the lower surface of the measuring tube 1 and the two ends of the multi-hole balancing throttling device 2, respectively. An upstream pipeline structure and a downstream pipeline structure are respectively provided at the bottom ends of the upstream pressure tapping pipe 3 and the downstream pressure tapping pipe 4. An electromagnetic flowmeter body 15 is provided between the upstream pipeline structure and the downstream pipeline structure.

[0019] The measuring tube 1, upstream pressure tapping tube 3, multi-hole balancing throttling device 2, and downstream pressure tapping tube 4 in this structure are rationally selected in terms of material, pipe wall thickness, and throttling device size based on the medium's physical properties and process parameters to meet the requirements for measuring the flow rate of conductive fluids. Among them, the multi-hole balancing throttling device 2 is a patented product, patent number ZL201120472412.7 "Multi-hole Balanced Throttling Meter". Through the symmetrical multi-hole design on the multi-hole balancing throttling device 2, the flow field is quickly rectified into an approximately ideal steady flow, eliminating the dead zone effect caused by throttling with only one hole. The vortex before and after the throttling device is greatly reduced, the permanent pressure loss is greatly reduced, and the energy-saving effect is good. At the same time, the straight pipe section requirements upstream and downstream of the throttling device are reduced. A straight pipe section of 3D upstream and 1D downstream is sufficient to achieve flow stability, meeting the requirements of insufficient straight pipe sections upstream and downstream on site. Furthermore, the design of the multi-hole balancing throttling device 2 greatly improves the signal-to-noise ratio of the differential pressure signal detected by the pressure tapping ports on the upstream and downstream sides of the throttling device, thereby significantly improving the stability of the differential pressure and ensuring the accuracy, stability, and reliability of the electromagnetic flowmeter measurement.

[0020] Measuring tube 1, porous balancing throttling device 2, upstream pressure tapping tube 3, and downstream pressure tapping tube 4 are connected by welding to ensure the stability and reliability of the structure.

[0021] Both ends of the outer surface of the measuring tube 1 are fixedly connected to the first flange 5.

[0022] The first flange 5 is used to connect and install the device in the test pipeline. Alternatively, the first flange 5 can be omitted, and the measuring tube 1 of the device can be directly fixed in the pipeline on site by welding.

[0023] The upstream pipeline structure includes an upstream connecting pipe 6 that is vertically connected to the bottom of the upstream pressure pipe 3. The other end of the upstream connecting pipe 6 is bent backward and a second flange 7 is fixedly connected to the end.

[0024] The downstream pipeline structure includes a downstream connecting pipe 8 that is vertically connected to the bottom end of the downstream pressure tapping pipe 4. The bottom end of the downstream connecting pipe 8 is connected to a tee 10. The other two connecting ports of the tee 10 are connected to short pipes 11. The other ends of the two short pipes 11 are respectively fixedly connected to a third flange 12 and a drain valve 13. A shut-off valve 9 is installed on the downstream connecting pipe 8 and between the downstream pressure tapping pipe 4 and the tee 10.

[0025] The electromagnetic flowmeter body 15 is installed between the upstream pipeline structure and the downstream pipeline structure via the second flange 7 and the third flange 12.

[0026] The fluid in the pipeline enters the electromagnetic flowmeter body 15 through the upstream pressure tap 3 and the upstream pipeline structure. After passing through the electromagnetic flowmeter body 15, it enters the downstream pipeline structure and eventually returns to the pipeline. During this process, the specific flow rate of the fluid can be measured through the electromagnetic flowmeter body 15.

[0027] The electromagnetic flowmeter body 15 can be equipped with electrodes and insulating linings of different materials according to fluid properties and process parameters. The diameter is usually no more than DN25. Both ends of the body are equipped with flange structures for connection with the second flange 7 and the third flange 12 in the upstream and downstream pipeline structures. Multiple structures in the downstream pipeline structure are connected by welding to ensure the sealing performance of the entire pipeline structure and avoid leakage.

[0028] The drain valve 13 can discharge impurities and dirt from the pipeline, ensuring the pipeline is unobstructed and avoiding blockage. It is generally required to use a ball valve or gate valve.

[0029] A flow-limiting orifice plate 14 is provided at the outlet end of the electromagnetic flowmeter body 15.

[0030] The orifice plate 14 is designed to have a smaller opening size based on the flow rate of the pipeline and the specifications of the electromagnetic flowmeter body 15. This size is designed to meet the measurement requirements of the electromagnetic flowmeter body 15 within its range. The smaller the specifications of the electromagnetic flowmeter body 15, the smaller the opening size of the orifice plate 14.

[0031] Compared with related technologies, the composite shoe spikes that maintain elasticity at low temperatures provided by this utility model have the following beneficial effects: The structure of this device adapts to the increasingly stringent social trend of energy metering and control, and can meet the measurement of large-diameter, high-flow-rate conductive fluids. At the same time, the device requires a short straight pipe section for measurement, low permanent pressure loss, and good energy-saving effect. The device also features an integrated design, compact structure, easy on-site installation and maintenance, and can display flow signals locally and transmit them remotely, facilitating data analysis, process improvement, increased production efficiency, and reduced costs for users, thus meeting the requirements of social energy management.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-hole electromagnetic flowmeter, characterized in that: The device includes a measuring tube (1), with a perforated balancing throttling device (2) fixedly connected to the middle of the inner cavity of the measuring tube (1). The lower surface of the measuring tube (1) and the two ends of the perforated balancing throttling device (2) are vertically connected to an upstream pressure tapping pipe (3) and a downstream pressure tapping pipe (4). The bottom ends of the upstream pressure tapping pipe (3) and the downstream pressure tapping pipe (4) are respectively provided with an upstream pipeline structure and a downstream pipeline structure. An electromagnetic flowmeter body (15) is provided between the upstream pipeline structure and the downstream pipeline structure.

2. The multi-hole electromagnetic flowmeter as described in claim 1, characterized in that: Both ends of the outer surface of the measuring tube (1) are fixedly connected to the first flange (5).

3. The multi-hole electromagnetic flowmeter as described in claim 1, characterized in that: The upstream pipeline structure includes an upstream connecting pipe (6) that is vertically connected to the bottom end of the upstream pressure pipe (3), and the other end of the upstream connecting pipe (6) is bent backward and fixedly connected to a second flange (7).

4. A multi-hole electromagnetic flowmeter as described in claim 3, characterized in that: The downstream pipeline structure includes a downstream connecting pipe (8) vertically connected to the bottom end of the downstream pressure tapping pipe (4). The bottom end of the downstream connecting pipe (8) is connected to a tee (10). The other two connecting ports of the tee (10) are connected to short pipes (11). The other ends of the two short pipes (11) are respectively fixedly connected to a third flange (12) and a drain valve (13). A shut-off valve (9) is provided on the downstream connecting pipe (8) and between the downstream pressure tapping pipe (4) and the tee (10).

5. A multi-hole electromagnetic flowmeter as described in claim 4, characterized in that: The electromagnetic flowmeter body (15) is installed between the upstream pipeline structure and the downstream pipeline structure via the second flange (7) and the third flange (12).

6. A multi-hole electromagnetic flowmeter as described in claim 5, characterized in that: The outlet end of the electromagnetic flowmeter body (15) is provided with a flow-limiting orifice plate (14).

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