An electromagnetic flowmeter resistant to magnetic-conductive impurity interference and its usage method

Abstract

The present invention belongs to the field of instruments and meters, and particularly relates to an electromagnetic flowmeter resistant to the interference of ferromagnetic impurities and its usage method. The electromagnetic flowmeter includes a measuring body, and the measuring body adopts a conventional electromagnetic flowmeter product. The present invention further includes a switchable demagnetization device composed of a first solenoid valve, a second three-way valve, a first demagnetization device, a second demagnetization device, and four connecting elbows. The first three-way valve includes one inlet and two outlets; the second three-way valve includes two inlets and one outlet. Both the first demagnetization device and the second demagnetization device include a connecting pipe, an adsorption device, and a plurality of permanent magnet particles. The adsorption device is located inside the connecting pipe and generates magnetism after being assembled with the permanent magnet particles for adsorbing the flowing ferromagnetic impurities. The four connecting elbows are used to connect with other components, thereby forming two freely switchable demagnetization paths. The present invention solves the problems that the accuracy of the electromagnetic flowmeter is easily affected by ferromagnetic impurities and the pipeline is difficult to clean and maintain.

Description

Technical Field

[0001] The present invention belongs to the field of instruments and meters, and particularly relates to an electromagnetic flowmeter resistant to the interference of ferromagnetic impurities and its usage method. Background Art

[0002] An electromagnetic flowmeter is a flowmeter that measures the movement of fluids based on the principle of electromagnetic induction. The structure of an electromagnetic flowmeter mainly consists of a magnetic circuit system, a measuring conduit, electrodes, a housing, a lining, a converter, and other components. The electromagnetic flowmeter measures the flow rate of a conductive fluid based on the electromotive force induced when the conductive fluid passes through an externally applied magnetic field. The electromagnetic flowmeter is an instrument with relatively high accuracy and a very wide range of applications. Currently, it has been widely used in chemical industries, municipal areas, and other places.

[0003] Although the electromagnetic flowmeter has high measurement accuracy, it also has the drawback of being easily interfered by external magnetic fields. For the interference of the external magnetic field of the instrument, it can be overcome by means of magnetic shielding. However, if the measured fluid medium contains ferromagnetic impurities, such as rust or other ferromagnetic particulate matters. These impurities may be adsorbed on the electrodes of the electromagnetic flowmeter under the action of the induced magnetic field, thereby significantly affecting the measurement accuracy of the electromagnetic flowmeter.

[0004] In the prior art, there is no effective means to overcome the influence of ferromagnetic impurities in the fluid. Installing a mesh filter device in the pipeline can remove some impurities to a certain extent, but this filter device may also change the fluidity of the pipeline, thereby affecting the measurement accuracy of the fluid flow rate.

[0005] In addition, when a conventional mesh filter device is used in a pipeline, there is also a safety risk of causing pipeline blockage. At the same time, after the filter device is blocked, the pipeline needs to be shut off, and the filter device needs to be replaced before re-measurement. For some chemical industries where pipeline cutting is not possible, this has almost no practical value. Summary of the Invention

[0006] In order to solve the problems that the measurement accuracy of the existing electromagnetic flowmeter is easily affected by ferromagnetic impurities in the fluid and the pipeline needs to be cut off during the pipeline cleaning and maintenance process, the present invention provides an electromagnetic flowmeter resistant to the interference of ferromagnetic impurities and its usage method.

[0007] The present invention is implemented by adopting the following technical solutions:

[0008] An electromagnetic flowmeter resistant to magnetic impurity interference, which includes a measurement body. The measurement body adopts any conventional electromagnetic flowmeter product available in the current market. The electromagnetic flowmeter further includes a switchable demagnetization device installed at the front end of the measurement body. The switchable demagnetization device is used to adsorb solid magnetic particle impurities contained in the fluid flowing through itself. The switchable demagnetization device includes: a first solenoid valve, a second three-way valve, a first demagnetization device, a second demagnetization device, and four connecting elbows.

[0009] Among them, the first three-way valve includes an inlet and two outlets; the inlet of the first three-way valve is used to communicate with the front-end interface of the pipeline where the electromagnetic flowmeter is to be installed.

[0010] The first demagnetization device includes a connecting pipe, an adsorption device, and a plurality of permanent magnet particles. The connecting pipe is a straight pipeline, including an inlet and an outlet. The adsorption device adopts a curved substrate that fits the inner wall of the connecting pipe; the curved substrate is fitted and installed on the inner wall of the connecting pipe and is detachably connected to the connecting pipe. Define the side of the curved substrate close to the center of the connecting pipe as the front side, then a plurality of deformation parts recessed from the back side to the front side are evenly distributed on the curved substrate, and installation grooves are formed at the positions corresponding to each deformation part on the back side of the curved substrate; each permanent magnet particle is embedded in the installation groove on the back side of the curved substrate.

[0011] The second demagnetization device is exactly the same as the first demagnetization device; the two are backups of each other in the whole device. During installation, both the first demagnetization device and the second demagnetization device are placed horizontally.

[0012] The second three-way valve includes two inlets and one outlet. The outlet of the second three-way valve is used to communicate with the inlet of the measurement body; the outlet of the measurement body is communicated with the rear-end interface of the pipeline where the electromagnetic flowmeter is to be installed.

[0013] Among the four connecting elbows of the present invention, one connecting elbow is connected between one outlet of the first three-way valve and the inlet of the first demagnetization device. The second connecting elbow is connected between the outlet of the first demagnetization device and one inlet of the second three-way valve. The third connecting elbow is connected between the other outlet of the first three-way valve and the inlet of the second demagnetization device. The fourth connecting elbow is connected between the outlet of the second demagnetization device and the other inlet of the second three-way valve.

[0014] Among them, the first demagnetization device and the second demagnetization device are detachably connected to the corresponding connecting elbows. The pipeline including the first demagnetization device between the first three-way valve and the second three-way valve is the first demagnetization path, and the pipeline including the second demagnetization device between the first three-way valve and the second three-way valve is the second demagnetization path; the first three-way valve and the second three-way valve are synchronously switched during use, so that any one of the first demagnetization path and the second demagnetization path is communicated with the measurement body.

[0015] As a further improvement of the present invention, the first three-way valve and the second three-way valve are electromagnetic valves or mechanical valves that can be switched synchronously.

[0016] When the first three-way valve and the second three-way valve are solenoid valves, the first three-way valve and the second three-way valve are electrically connected to the same controller, and the controller synchronously issues control instructions to the first three-way valve and the second three-way valve when switching.

[0017] When the first three-way valve and the second three-way valve are mechanical valves, the valve switches of the two valves are connected with a connecting rod mechanism for synchronously performing the switching actions of the two valves.

[0018] As a further improvement of the present invention, the first three-way valve, the second three-way valve, the first demagnetization device, the second demagnetization device and the interfaces of the four connecting elbows are all connected with flanges of matching models, and the components are detachably connected through the flanges.

[0019] As a further improvement of the present invention, the curved substrate adopts an incomplete pipeline structure cut along the extension direction of the pipeline or a complete full pipeline structure; and when the curved substrate adopts an incomplete pipeline structure, the curved substrate is attached to the lower half of the connecting pipe.

[0020] As a further improvement of the present invention, the curved substrate is made of stainless steel and is detachably connected to the inner wall of the connecting pipe via a retaining spring.

[0021] In another embodiment of the present invention, the adsorption device of the first demagnetization device or the second demagnetization device adopts a tubular structure that matches the shape of the inner cavity of the connecting tube; the adsorption device is detachably installed in the tube body of the connecting tube. The adsorption device includes a collecting tube and a carrier tube, and the collecting tube is sleeved inside the carrier tube. A plurality of mounting grooves are evenly distributed on the outer tube wall of the carrier tube; a plurality of miniature storage bags are distributed on the inner tube wall of the collecting tube. The opening of each storage bag in the collecting tube faces the same direction and is arranged relative to the flow direction of the fluid. In the assembled state, the positions of the mounting grooves on the carrier tube correspond one by one to the positions of the storage bags on the collecting tube; the carrier tube is made of non-magnetic material, and the collecting tube is made of magnetic material.

[0022] As a further improvement of the present invention, the carrier tube includes a plurality of sub-base plates and at least one fastener; each sub-base plate is assembled to form a tubular structure, and the fastener is used to lock the state of the tubular structure after each sub-base plate is assembled. Multiple mounting grooves are distributed on each sub-base plate in the carrier tube; external threads or annular grooves are set at both ends of the pipe of the assembly formed by each curved surface base plate in the carrier tube; when an external thread structure is adopted, a sleeve ring with internal threads is used as a fastener. When an annular groove is adopted, an openable clamp or a retaining spring is used as a fastener.

[0023] As a further improvement of the present invention, a transparent observation window is provided on the connecting pipe between the first degaussing device and the second degaussing device, and the observation window is used to observe the accumulation amount of the magnetically conductive impurities adsorbed on the internal adsorption device.

[0024] As a further improvement of the present invention, the observation window is made of transparent glass material or organic glass material.

[0025] In the present invention, the method for using the electromagnetic flowmeter resistant to interference from magnetic impurities includes two parts: an assembly stage and a cleaning and maintenance stage. The assembly process of the electromagnetic flowmeter resistant to interference from magnetic impurities is as follows:

[0026] (1) The sub-substrates in the carrier tube are assembled to the outer surface of the collecting tube in sequence, and then fixedly connected by fasteners to obtain an adsorption device.

[0027] (2) The adsorption device is installed inside the connecting pipe through the retaining spring, thereby assembling the first demagnetization device and the second demagnetization device.

[0028] (3) The first three-way valve, the second three-way valve, the first demagnetization device, and the second demagnetization device are assembled separately to form a switchable demagnetization device including two independently operable demagnetization paths.

[0029] (4) Connect the inlet of the first three-way valve to the front end of the fluid pipeline to be measured. Connect a conventional electromagnetic flowmeter as a measuring body to the rear of the outlet of the second electromagnetic valve. The rear end of the fluid pipeline to be measured is connected to the outlet of the measuring body.

[0030] (5) The switchable demagnetization device is set to a state where any one of the demagnetization paths is turned on. At this time, the measuring body starts measuring.

[0031] The operation and maintenance personnel regularly check the operating status of the equipment through the observation window on the degaussing device. When it is observed that the accumulation of magnetic impurities on the internal adsorption device has reached the upper limit or the current degaussing path operation time has reached the upper limit, it is necessary to clean and maintain the electromagnetic flowmeter that resists interference from magnetic impurities. The cleaning and maintenance process is as follows:

[0032] (i) The demagnetization path at the front end of the measuring body is switched by a controller or a valve switch.

[0033] (ii) After completing the path switching in the above step, the demagnetizing device that has accumulated magnetic impurities is removed from the connecting elbow.

[0034] (iii) Take out the adsorption device in the disassembled demagnetization device from the connecting pipe, and then remove the fasteners and each sub-base plate in the adsorption device in turn.

[0035] (ⅳ) Send the collection tube to an ultrasonic cleaner to clean and dry it, and then reassemble the sub-substrate and fasteners onto the cleaned collection tube to obtain a reusable adsorption device.

[0036] (ⅴ) Reinstall the adsorption device into the connecting tube, and reassemble the demagnetization device obtained into the original pipeline.

[0037] (ⅵ) After the accumulation of magnetic-conductive impurities in the current demagnetization path reaches the operating limit, re-execute steps (ⅰ)-(ⅴ).

[0038] The technical solution provided by the present invention has the following beneficial effects:

[0039] The electromagnetic flowmeter provided by the present invention that resists the interference of magnetic-conductive impurities can remove the magnetic-conductive impurities contained in the fluid flowing through the electromagnetic flowmeter by means of magnetic adsorption and microstructural interception; thereby achieving the effect of improving the measurement accuracy of the electromagnetic flowmeter. The device of the present invention can not only improve the removal rate of magnetic-conductive impurities contained in the fluid, but also will not affect the fluidity of the fluid in the pipeline, eliminating the risk of pipeline blockage easily caused by the filtration solution for removing magnetic-conductive impurities.

[0040] The adsorption device provided by the present invention has good adsorption effect, low production cost, and can be recycled, so it has good practical value and can generate outstanding economic benefits. The present invention also designs a switchable demagnetization device with dual-channel redundancy characteristics, which improves the disassembly and assembly cost of the device and reduces the impact of the demagnetization device on the channel fluidity during cleaning and maintenance, realizing uninterrupted measurement and continuous-flow maintenance.

[0041] The present invention also improves the structure of the adsorption device to improve the removal effect of the device on various solid suspensions with different properties contained in the fluid except magnetic-conductive impurities, and significantly reduces the cleaning difficulty of the adsorption device. Brief Description of the Drawings

[0042] Figure 1 It is a schematic structural diagram of an electromagnetic flowmeter that resists the interference of magnetic-conductive impurities provided in Embodiment 1 of the present invention.

[0043] Figure 2 It is a schematic structural diagram of the first demagnetization device in Embodiment 1 of the present invention.

[0044] Figure 3 It is a schematic structural diagram of an adsorption device with a curved substrate in a semi-sectioned pipe shape.

[0045] Figure 4 It is a schematic structural diagram of an adsorption device with a curved substrate in a complete pipe shape.

[0046] Figure 5 ForFigure 2 When the first degaussing device in

[0047] Figure 6 is a semi-sectioned pipe-shaped adsorption device, the structural schematic diagram from the perspective of one side of the flange.

[0048] Figure 7 is the structural schematic diagram of the first degaussing device equipped with an observation window.

[0049] Figure 8 In Embodiment 2, it is the structural schematic diagram of the adsorption device adopting a split structure.

[0050] Figure 9 is Figure 8 the structural schematic diagram of the collection pipe in the adsorption device of

[0051] Figure 10 is Figure 8 the disassembled structural schematic diagram of the carrier pipe in the adsorption device of

[0052] In the figure, the markings are:

[0053] 1. Connecting pipe; 2. Adsorption device; 3. Permanent magnet particles; 4. Snap ring; 6. Measuring body; 11. Flange; 20. Curved substrate; 21. Carrier pipe; 22. Collection pipe; 51. First three-way valve; 52. Second three-way valve; 53. Connecting elbow; 54. First degaussing device; 55. Second degaussing device; 100. Observation window; 210. Installation groove; 211. Collar; 220. Storage bag. Specific Embodiments

[0054] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention 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 only used to explain the present invention and are not used to limit the present invention.

[0055] Embodiment 1

[0056] This embodiment provides an electromagnetic flowmeter resistant to interference from magnetoconductive impurities. The electromagnetic flowmeter includes a measuring body 6, and the measuring body 6 adopts any conventional electromagnetic flowmeter product available on the market currently. In particular, as Figure 1 shown, the electromagnetic flowmeter provided in this embodiment further includes a switchable degaussing device installed at the front end of the measuring body 6. The switchable degaussing device is used to adsorb solid magnetoconductive particulate impurities contained in the fluid flowing through itself. The switchable degaussing device includes: a first solenoid valve, a second three-way valve 52, a first degaussing device 54, a second degaussing device 55, and four connecting elbows 53.

[0057] Among them, the first three-way valve 51 includes an inlet and two outlets; the inlet of the first three-way valve 51 is used to communicate with the front-end interface of the pipeline where the electromagnetic flowmeter is to be installed.

[0058] As Figure 2 shown, the first demagnetization device 54 includes a connecting pipe 1, an adsorption device 2, and a plurality of permanent magnet particles 3. The connecting pipe 1 is a straight pipe and includes an inlet and an outlet. The adsorption device 2 uses a curved substrate 20 that fits the inner wall of the connecting pipe 1; the curved substrate 20 is fitted and installed on the inner wall of the connecting pipe 1 and is detachably connected to the connecting pipe 1. Define the side of the curved substrate 20 close to the center of the connecting pipe 1 as the front side, then a plurality of deformation parts recessed from the back side to the front side are evenly distributed on the curved substrate 20, and installation grooves 210 are formed at the positions corresponding to the respective deformation parts on the back side of the curved substrate 20; each permanent magnet particle 3 is embedded and installed in the installation groove 210 on the back side of the curved substrate 20. The second demagnetization device 55 is exactly the same as the first demagnetization device 54; the two are backups of each other in the whole device. During installation, both the first demagnetization device 54 and the second demagnetization device 55 are placed horizontally.

[0059] The second three-way valve 52 includes two inlets and one outlet. The outlet of the second three-way valve 52 is used to communicate with the inlet of the measuring body 6; the outlet of the measuring body 6 is communicated with the rear-end interface of the pipeline where the electromagnetic flowmeter is to be installed.

[0060] Among the four connecting elbows 53 of the present invention, one connecting elbow 53 is connected between one outlet of the first three-way valve 51 and the inlet of the first demagnetization device 54. The second connecting elbow 53 is connected between the outlet of the first demagnetization device 54 and one inlet of the second three-way valve 52. The third connecting elbow 53 is connected between the other outlet of the first three-way valve 51 and the inlet of the second demagnetization device 55. The fourth connecting elbow 53 is connected between the outlet of the second demagnetization device 55 and the other inlet of the second three-way valve 52.

[0061] Among them, the first demagnetization device 54 and the second demagnetization device 55 are detachably connected to the corresponding connecting elbows 53. The pipeline including the first demagnetization device 54 between the first three-way valve 51 and the second three-way valve 52 is the first demagnetization path, and the pipeline including the second demagnetization device 55 between the first three-way valve 51 and the second three-way valve 52 is the second demagnetization path; the first three-way valve 51 and the second three-way valve 52 are synchronously switched during use, so that any one of the first demagnetization path and the second demagnetization path is communicated with the measuring body 6. Specifically, flange plates 11 with matching models are connected at the interfaces where the first three-way valve 51, the second three-way valve 52, the first demagnetization device 54, the second demagnetization device 55, and the four connecting elbows 53 are connected to each other, and the components are detachably connected through the flange plates 11.

[0062] In this embodiment, the first degaussing device 54 and the second degaussing device 55 adsorb the solid magnetic impurities in the fluid medium flowing through themselves through the internal adsorption device 2, thereby eliminating the interference of the magnetic impurities in the subsequent flowmeter. In the adsorption device 2, the curved substrate 20 mainly serves as a carrier for the permanent magnet particles 3, and the curved substrate 20 loaded with the permanent magnet particles 3 constitutes the adsorption device 2, thereby generating a magnetic adsorption effect on the magnetic impurities in the connecting pipe 1.

[0063] To reduce the influence of the adsorption device 2 on the pipeline fluidity, the curved substrate 20 should be attached to the inner wall of the connecting pipe 1 and arranged along the extension direction of the pipeline. The shape of the curved substrate 20 in this embodiment is not limited. For example, it can adopt a non-complete pipeline structure cut along the pipeline extension direction as shown in Figure 3 . It can also adopt a complete full-pipeline structure as shown in Figure 4 . In particular, considering that the density of magnetic impurities such as rust or other metal particles contained in the fluid is usually greater than the density of the fluid matrix, the magnetic impurities are mainly distributed at the bottom of the pipeline and move forward with the movement of the fluid. Therefore, in order to improve the adsorption efficiency of the impurities, when the curved substrate 20 of this embodiment adopts a non-complete pipeline structure, the curved substrate 20 is attached to the lower half of the connecting pipe 1. At this time, the position distribution of the curved substrate 20 is as shown in Figure 5 .

[0064] Figure 4 and Figure 5 The differences between the two different-shaped adsorption devices 2 are as follows: Figure 5 The arc-shaped plate adsorption device 2 in usually has a good adsorption effect on the large-particle-size magnetic impurities deposited at the bottom of the pipeline and flowing. While Figure 4 The tubular adsorption device 2 in can generate a magnetic adsorption effect at any position in the radial direction of the connecting pipe 1. Therefore, it can adsorb impurities with large particle sizes deposited at the bottom of the pipeline, and can also adsorb small-particle-size and light magnetic impurities suspended or diffused everywhere in the pipeline.

[0065] In this embodiment, the working principle of the switchable degaussing device is as follows: After the product is installed in the pipeline, if there are magnetic impurities in the fluid, such as rust, iron powder, etc. These impurities will be attracted by the magnetic field of the permanent magnet particles 3 embedded on the adsorption device 2 when flowing through the connecting pipe 1, and then tightly adsorbed on the inner wall of the adsorption device 2. Since the density of substances such as rust and iron powder is usually greater than the density of the conveyed fluid, such as water, refined oil and other media, during the fluid flow, the impurities usually deposit at the bottom of the pipeline and flow with the medium. Installing the curved substrate 20 in the adsorption device 2 at a position close to the lower half of the pipeline in this embodiment can improve the adsorption efficiency of the impurities.

[0066] In addition to the magnetic adsorption through the permanent magnet particles 3, the surface of the curved substrate 20 in this embodiment is also densely covered with a large number of raised deformation parts. Therefore, the side of the curved substrate 20 close to the inner wall of the pipeline is uneven and has a large roughness. This raised surface structure is for the convenience of installing the permanent magnet particles 3 on the back of the curved substrate 20 on the one hand, and for increasing the resistance to magnetic impurities in this section of the pipeline on the other hand, making it difficult for the impurities to flow away from this section, and then tightly adsorbing the magnetic impurities to the surface of the adsorption device 2.

[0067] In addition, in other embodiments, in order to further increase the resistance of the adsorption device 2 to impurities in the fluid, the front surface of the curved substrate 20 in the adsorption device 2 can be further roughened (such as by sandblasting). This increases the resistance of the adsorption device 2 to the flowing magnetic particles and the adsorption efficiency, and accurately captures various particulate matters in the medium (including both magnetic impurities and non-magnetic impurities).

[0068] In this embodiment, the magnetic particles are installed on the back of the curved substrate 20 and embedded between the pipe wall and the curved substrate 20. Therefore, the magnetic particles can be protected from falling off due to the impact of the water flow, and the magnetic particles can also be prevented from being worn or contaminated by impurities, thereby increasing the service life of the demagnetization device.

[0069] Considering that when the amount of impurities adsorbed on the adsorption device 2 is too large, on the one hand, it will reduce the adsorption force on the impurities, and on the other hand, it will also affect the normal flow of the pipeline. Therefore, the leading demagnetization device in this embodiment needs to be regularly replaced or cleaned after being used for a period of time.

[0070] To facilitate observing the amount of impurities adsorbed on the surface of the adsorption device 2, as Figure 6 and Figure 7 shown, this embodiment particularly opens an observation window 100 on the upper part of the pipe body of the connecting pipe 1. Among them, the connecting pipe 1 is integrally made of stainless steel material and is provided with a through groove for installing the observation window 100. The observation window 100 is made of materials such as highly transparent and high-strength glass or plexiglass. Since the adsorption device 2 in this embodiment is a semi-sectioned pipe and is located below the connecting pipe 1, and the observation window 100 is opened on the upper part of the connecting pipe 1, the magnetic impurities adsorbed on the surface of the internal adsorption device 2 can be directly observed through the observation window 100. When using an adsorption device 2 with a full-pipeline structure, an observation window 100 needs to be opened at the end of the connecting pipe 1, and then the inner pipe is tilted to the state inside the curved substrate 20. Of course, under the condition of material strength operation, the entire connecting pipe 1 can also be made of transparent glass-based or resin materials, such as using polymethyl methacrylate to prepare the required connecting pipe 1.

[0071] When the installed leading degaussing device reaches the specified service life or when it is observed that the amount of impurities adsorbed on the adsorption device 2 reaches the design tolerance, the management staff needs to remove the connecting pipe 1 of the degaussing device from the pipeline. Take out the adsorption device 2 with ferromagnetic impurities adsorbed therein, and assemble a brand-new adsorption device 2 into the connecting pipe 1 through the snap ring 4, and then install it at the original assembly position to restart it. The removed adsorption device 2 can be cleaned of the magnetic impurities adsorbed on its surface manually or by machine, and reused during the next disassembly and maintenance. During the cleaning process, attention should be paid not to cause the magnetic particles to fall off, and the fallen magnetic particles should be reinstalled into the installation groove 210 of the adsorption device 2.

[0072] After achieving the technical effect of removing ferromagnetic impurities by magnetic adsorption, a new type of switchable degaussing device is specially designed in the technical solution of this embodiment. Two independent degaussing paths are provided in this degaussing device. The two degaussing paths are redundant to each other. When one of them fails, the other can be switched to work in time to avoid the interruption of the entire fluid channel. Furthermore, uninterrupted flow measurement can be realized, expanding the application of this device in different scenarios. After adopting the switchable degaussing device of this embodiment, when one of the degaussing devices reaches the service life and needs to be cleaned and maintained, the fluid channel can be switched to disconnect the fluid channel of the degaussing device to be cleaned, and then the degaussing device can be removed from the communicating elbow 53 and reinstalled after cleaning.

[0073] In the electromagnetic flowmeter provided in this embodiment, the first three-way valve 51 and the second three-way valve 52 can adopt solenoid valves or mechanical valves that can achieve synchronous switching. When the first three-way valve 51 and the second three-way valve 52 adopt solenoid valves, the first three-way valve 51 and the second three-way valve 52 are electrically connected to the same controller, and the controller issues control instructions to the first three-way valve 51 and the second three-way valve 52 synchronously during switching. When the first three-way valve 51 and the second three-way valve 52 adopt mechanical valves, a connecting rod mechanism for synchronously executing the switching actions of the two is connected to the valve switches of the two. The curved surface substrate 20 is made of stainless steel material and is detachably connected to the inner wall of the connecting pipe 1 through the snap ring 4.

[0074] It should be emphasized that the number of degaussing channels provided in the technical solution of this embodiment is two. In other embodiments, technical solutions with more than two degaussing channels are still within the technical concept of the present invention by adopting components with other structures. At the same time, it is the optimal structural solution of the present invention that the first degaussing device 54 and the second degaussing device 55 adopt straight pipes and are installed in a horizontal arrangement. In other embodiments, using special-shaped pipes, such as spiral pipes, and arranging them in any direction, still belongs to the technical concept of the present invention.

[0075] Embodiment 2

[0076] In the adsorption device 2 provided in Embodiment 1, the permanent magnet particles 3 and the ferromagnetic impurities are located on both sides of the curved substrate 20 respectively. During the cleaning process, only the ferromagnetic impurities need to be removed from the surface of the curved substrate 20. If necessary, the permanent magnet particles 3 on the back of the curved substrate 20 can be taken out first, and then the front of the curved substrate 20 can be cleaned.

[0077] On the basis of Embodiment 1, in order to further improve the removal rate of the ferromagnetic impurities by the adsorption device 2 and reduce the cleaning difficulty of the adsorption device 2. In this embodiment, the structure of the adsorption device 2 adopted in Embodiment 1 is further improved.

[0078] Specifically, as Figure 8 shown, in the electromagnetic flowmeter resistant to ferromagnetic impurity interference provided in this embodiment, the adsorption device 2 of the first demagnetization device 54 or the second demagnetization device 55 adopts a tubular structure matching the inner cavity shape of the connecting pipe 1; the adsorption device 2 is detachably installed in the pipe body of the connecting pipe 1. The adsorption device 2 adopts a split design, including a collecting pipe 22 and a carrier pipe 21, and the collecting pipe 22 is sleeved inside the carrier pipe 21. A plurality of mounting grooves 210 are uniformly distributed on the outer pipe wall of the carrier pipe 21; a plurality of miniature storage bags 220 are distributed on the inner pipe wall of the collecting pipe 22. The openings of each storage bag 220 in the collecting pipe 22 face the same direction and are all arranged relative to the fluid flow direction. In the assembled state, the positions of the respective mounting grooves 210 on the carrier pipe 21 correspond to the positions of the respective storage bags 220 on the collecting pipe 22 one by one; the carrier pipe 21 is made of non-magnetic material, and the collecting pipe 22 is made of magnetic material.

[0079] In the improved solution of this embodiment, as Figure 9 shown, a large number of "hood" - shaped storage bags 220 are also provided on the surface of the collecting pipe 22. These storage bags 220 protrude from the inner pipe wall surface of the collecting pipe 22, so that various pollutants flowing through can be intercepted. At the same time, the microstructures in the shape of the storage bags 220 all contain inner cavities, and the opening directions of the storage bags 220 face the fluid flow direction. Therefore, the inner cavities of the storage bags 220 can firmly fix the adsorbed impurities on the pipe wall of the collecting pipe 22, preventing the impurities from falling off due to the impact of the fluid. That is: compared with the adsorption device 2 in Embodiment 1, the collecting pipe 22 in this embodiment can not only remove impurities by magnetic adsorption, but also remove impurities by structural interception. Therefore, the removal rate of ferromagnetic impurities can be significantly improved.

[0080] The hood-shaped storage bag 220 in the collection pipe 22 is actually a micro-structure at the processing site, which can be specifically processed on the surface of the metal substrate by femtosecond laser etching and numerical control machine tool extrusion. In other embodiments, replacing the hood-shaped storage bag 220 in the collection pipe 22 with a bionic intestinal inner wall cilia structure or a bending structure similar to the surface of a kitchen grater tool can also produce similar technical effects.

[0081] In addition, in Embodiment 1 of this embodiment, the length of the adsorbed impurities in the pipeline can be appropriately extended so that the impurities can be completely removed. At the same time, technicians can also reasonably select the particle size, magnetic induction intensity, and distribution density of the permanent magnet particles 3, thereby optimizing the magnetic adsorption effect of the adsorption device 2 on the impurities. For example, when the diameter of the pipeline through which the fluid flows is larger, permanent magnet particles 3 with stronger magnetism and larger particle sizes need to be used, and the distribution density of the permanent magnet particles 3 should also be larger. When the diameter of the pipeline through which the fluid flows is smaller, permanent magnet particles 3 with smaller particle sizes can be used, and the distribution density of the permanent magnet particles 3 on the adsorption device 2 can also be appropriately reduced.

[0082] Similar to Embodiment 1, the leading demagnetization device provided in this embodiment also needs to be cleaned and maintained after being used for a period of time. The split double-layer tubular structure of this embodiment can reduce the cleaning difficulty of the adsorption device 2. Due to the double-layer tube structure, the carrier tube 21 on the outer layer of the adsorption device 2 will not be contaminated with ferromagnetic impurities during use, and the impurities are mainly adsorbed on the inner wall of the collection pipe 22. When cleaning the product of this embodiment, the collection pipe 22 can be detached from the carrier tube 21. In the state where the two are detached, the collection pipe 22 no longer has magnetism, and the inner wall of the collection pipe 22 can be cleaned simply by using a brush or water flow.

[0083] To facilitate the disassembly and assembly of the carrier tube 21 and the collection pipe 22, this embodiment further designs the carrier tube 21 as an assembled component. As Figure 10 shown, the carrier tube 21 includes a plurality of sub-substrates and at least one fastener; each sub-substrate forms a tubular structure after assembly, and the fastener is used to lock the state of the tubular structure formed by the assembly of each sub-substrate. A plurality of mounting grooves 210 are distributed on each sub-substrate in the carrier tube 21; external threads or annular grooves are provided at both ends of the pipeline of the combination formed by each curved substrate 20 in the carrier tube 21; when using an external thread structure, a sleeve 211 containing internal threads is used as the fastener. When using an annular groove, a separable clamp or snap spring 4 is used as the fastener.

[0084] Taking the threaded assembly structure as an example, the assembly process of the adsorption device 2 in this embodiment is as follows: the technician first embeds the permanent magnet particles 3 into the mounting groove 210 on the surface of each sub-substrate, and then sequentially fits the sub-substrates on the outer wall of the collection tube 22, and finally tightens the collar 211 to the two ends of the assembled carrier tube 21 to obtain the required adsorption carrier. The disassembly process of the adsorption device 2 is the opposite. The technician first unscrews the collar 211 at both ends, and then peels off each sub-substrate in turn. For the collection tube 22 with the carrier tube 21 removed, it can be directly placed in an ultrasonic cleaning machine to remove impurities and dirt accumulated inside the storage bag 220 through ultrasonic vibration.

[0085] Similar to the first embodiment, a transparent observation window 100 is also provided on the connecting pipe 1 of the first degaussing device 54 and the second degaussing device 55 of the present embodiment, and the observation window 100 is used to observe the accumulation amount of the magnetic conductive impurities adsorbed on the internal adsorption device 2. The observation window 100 is made of transparent glass material or organic glass material.

[0086] In this embodiment, the method for using the electromagnetic flowmeter resistant to interference from magnetic impurities includes two parts: an assembly stage and a cleaning and maintenance stage. The assembly process of the electromagnetic flowmeter resistant to interference from magnetic impurities is as follows:

[0087] (1) The sub-substrates in the carrier tube 21 are assembled to the outer surface of the collecting tube 22 in sequence, and then fixedly connected by fasteners to obtain the adsorption device 2.

[0088] (2) The adsorption device 2 is installed into the interior of the connecting pipe 1 through the clamping spring 4, thereby assembling the first demagnetization device 54 and the second demagnetization device 55.

[0089] (3) The first three-way valve 51, the second three-way valve 52, the first demagnetization device 54, and the second demagnetization device 55 are assembled respectively to form a switchable demagnetization device including two independently operable demagnetization paths.

[0090] (4) Connect the inlet of the first three-way valve 51 to the front end of the fluid pipeline to be measured. Connect a conventional electromagnetic flowmeter as a measuring body 6 to the rear of the outlet of the second electromagnetic valve. The rear end of the fluid pipeline to be measured is connected to the outlet of the measuring body 6.

[0091] (5) The switchable demagnetization device is set to a state where any one of the demagnetization paths is turned on. At this time, the measurement body 6 starts measuring.

[0092] The operation and maintenance personnel regularly check the operation status of the equipment through the observation window 100 on the degaussing device. When it is observed that the accumulation of ferromagnetic impurities on the internal adsorption device 2 reaches the upper limit or the running time of the current degaussing path reaches the upper limit, the electromagnetic flowmeter against the interference of ferromagnetic impurities needs to be cleaned and maintained. The cleaning and maintenance process is as follows:

[0093] (ⅰ) Switch the degaussing path at the front end of the measurement body 6 through the controller or valve switch.

[0094] (ⅱ) After completing the path switching in the above step, remove the degaussing device that has accumulated ferromagnetic impurities from the connecting elbow 53.

[0095] (ⅲ) Take out the adsorption device 2 in the removed degaussing device from the connecting pipe 1, and then sequentially remove the fasteners and each sub-substrate in the adsorption device 2.

[0096] (ⅳ) Send the collection pipe 22 to an ultrasonic cleaner to be cleaned and dried, and then reassemble the sub-substrate and the fasteners onto the collection pipe 22 after cleaning to obtain a reusable adsorption device 2.

[0097] (ⅴ) Reinstall the adsorption device 2 into the connecting pipe 1, and reassemble the obtained degaussing device into the original pipeline.

[0098] (ⅵ) After the accumulation of ferromagnetic impurities in the currently used degaussing path reaches the operating limit, re-execute steps (ⅰ)-(ⅴ).

[0099] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electromagnetic flowmeter resistant to the interference of magnetically conductive impurities, which comprises a measuring body. The measuring body adopts a conventional electromagnetic flowmeter product, and is characterized in that, The electromagnetic flowmeter further includes a switchable degaussing device installed at the front end of the measuring body, and the switchable degaussing device is used to adsorb solid ferromagnetic particle impurities contained in the fluid flowing through itself; The switchable degaussing device includes: A first three-way valve, which includes an inlet and two outlets; the inlet of the first three-way valve is used to communicate with the front-end interface of the pipeline where the electromagnetic flowmeter is to be installed; A first degaussing device, which includes a connecting pipe, an adsorption device and a plurality of permanent magnet particles; the connecting pipe is a straight pipe, including an inlet and an outlet; the adsorption device adopts a curved substrate that fits the inner wall of the connecting pipe; the curved substrate is fitted and installed on the inner wall of the connecting pipe and is detachably connected to the connecting pipe; define the side of the curved substrate close to the center of the connecting pipe as the front side, then a plurality of deformation parts recessed from the back side to the front side are evenly distributed on the curved substrate, and installation grooves are formed at the positions corresponding to the respective deformation parts on the back side of the curved substrate; each permanent magnet particle is embedded in the installation groove on the back side of the curved substrate; A second degaussing device; which is exactly the same as the first degaussing device; the first degaussing device and the second degaussing device are both horizontally placed in the use state; A second three-way valve, which includes two inlets and one outlet; the outlet of the second three-way valve is used to communicate with the inlet of the measuring body; the outlet of the measuring body is communicated with the rear-end interface of the pipeline where the electromagnetic flowmeter is to be installed; and Four connecting elbows; one connecting elbow is connected between one outlet of the first three-way valve and the inlet of the first degaussing device; the second connecting elbow is connected between the outlet of the first degaussing device and one inlet of the second three-way valve; the third connecting elbow is connected between the other outlet of the first three-way valve and the inlet of the second degaussing device; the fourth connecting elbow is connected between the outlet of the second degaussing device and the other inlet of the second three-way valve; Wherein, the first degaussing device and the second degaussing device are detachably connected to the corresponding connecting elbows; the pipeline including the first degaussing device between the first three-way valve and the second three-way valve is the first degaussing path, and the pipeline including the second degaussing device between the first three-way valve and the second three-way valve is the second degaussing path; the first three-way valve and the second three-way valve are synchronously switched during use, so that any one of the first degaussing path and the second degaussing path is communicated with the measuring body.

2. The electromagnetic flowmeter for resisting interference of anti-magnetic impurities as described in claim 1, characterized in that: The first three-way valve and the second three-way valve adopt synchronously switchable solenoid valves or mechanical valves; When the first three-way valve and the second three-way valve adopt solenoid valves, the first three-way valve and the second three-way valve are electrically connected to the same controller, and the controller issues control instructions to the first three-way valve and the second three-way valve synchronously during switching; When the first three-way valve and the second three-way valve adopt mechanical valves, a connecting rod mechanism for synchronously executing the switching actions of the two is connected to the valve switches of the two.

3. The electromagnetic flowmeter for resisting the interference of magnetically conductive impurities as described in claim 1, wherein: Flange plates with matching models are provided at the interfaces where the first three-way valve, the second three-way valve, the first degaussing device, the second degaussing device and the four connecting elbows are connected to each other, and the components are detachably connected through the flange plates.

4. The electromagnetic flowmeter for resisting interference of magnetically conductive impurities as claimed in claim 1, wherein: The curved substrate adopts an incomplete pipeline structure cut along the extension direction of the pipeline or a complete full pipeline structure; and when the curved substrate adopts the incomplete pipeline structure, the curved substrate is attached to the lower half of the connecting pipe.

5. The electromagnetic flowmeter resistant to interference by magnetic-conductive impurities as claimed in claim 4, wherein: The curved substrate is made of stainless steel and is detachably connected to the inner wall of the connecting pipe via a clamping spring.

6. The electromagnetic flowmeter for resisting interference of anti-magnetic impurities according to claim 2, characterized in that: The adsorption device of the first demagnetization device or the second demagnetization device adopts a tubular structure that matches the shape of the inner cavity of the connecting tube; the adsorption device can be detachably installed in the tube body of the connecting tube; the adsorption device includes a collecting tube and a carrier tube, and the collecting tube is sleeved inside the carrier tube; a plurality of mounting grooves are evenly distributed on the outer tube wall of the carrier tube; a plurality of miniature storage bags are distributed on the inner tube wall of the collecting tube; the opening of each storage bag in the collecting tube faces the same direction and is arranged relative to the flow direction of the fluid; in the assembled state, the positions of the respective mounting grooves on the carrier tube correspond one by one to the positions of the respective storage bags on the collecting tube; the carrier tube is made of non-magnetic material, and the collecting tube is made of magnetic material.

7. The electromagnetic flowmeter for resisting interference of magnetic-conductive impurities according to claim 6, wherein: The carrier tube includes multiple sub-base plates and at least one fastener; each of the sub-base plates forms a tubular structure after being assembled, and the fastener is used to lock the state of the tubular structure after each of the sub-base plates is assembled; multiple mounting grooves are distributed on each of the sub-base plates in the carrier tube; external threads or annular grooves are arranged at both ends of the pipe of the assembly formed by each curved base plate in the carrier tube; when an external thread structure is adopted, the fastener is a ring with an internal thread; when an annular groove is adopted, the fastener is an openable and closable clamp or a retaining spring.

8. The electromagnetic flowmeter for resisting interference of anti-magnetic impurities according to claim 7, characterized in that: A transparent observation window is provided on the connecting pipe between the first degaussing device and the second degaussing device, and the observation window is used to observe the accumulation amount of the magnetic conductive impurities adsorbed on the internal adsorption device.

9. The electromagnetic flowmeter for resisting interference of anti-magnetic impurities according to claim 8, characterized in that: The observation window is made of transparent glass material or organic glass material.

10. A method for using an electromagnetic flowmeter that resists interference from magnetically conductive impurities as described in claim 9, characterized in that: The method of use includes two parts: assembly stage and cleaning and maintenance stage; The assembly process of the electromagnetic flowmeter resistant to interference from magnetic impurities is as follows: (1) Sequentially assembling the sub-substrates in the carrier tube to the outer surface of the collecting tube, and then fixing them with fasteners to obtain the adsorption device; (2) The adsorption device is installed inside the connecting pipe by means of a retaining spring, thereby assembling the first demagnetization device and the second demagnetization device; (3) Assembling the first three-way valve, the second three-way valve, the first demagnetization device, and the second demagnetization device respectively to form a switchable demagnetization device including two independently operated demagnetization paths; (4) connecting the inlet of the first three-way valve to the front end of the fluid pipeline to be measured; connecting a conventional electromagnetic flowmeter as a measuring body to the rear of the outlet of the second electromagnetic valve; and connecting the rear end of the fluid pipeline to be measured to the outlet of the measuring body; (5) The switchable degaussing device is set to a state where any degaussing path is turned on, and at this time, the measuring body starts measuring; The operation and maintenance personnel regularly check the operation status of the equipment through the observation window on the degaussing device. When it is observed that the accumulation of ferromagnetic impurities on the internal adsorption device reaches the upper limit or the operation time of the current degaussing path reaches the upper limit, it is necessary to clean and maintain the electromagnetic flowmeter against the interference of ferromagnetic impurities. The cleaning and maintenance process is as follows: (ⅰ) Switch the degaussing path in the switchable degaussing device at the front end of the measuring body through the controller or valve switch; (ⅱ) After completing the path switching in the above step, remove the degaussing device that has accumulated ferromagnetic impurities from the connecting elbow; (ⅲ) Take out the adsorption device in the removed degaussing device from the connecting pipe, and then sequentially remove the fasteners and each sub-substrate in the adsorption device; (ⅳ) Send the collecting pipe to the ultrasonic cleaner to be cleaned and dried, and then reassemble the sub-substrate and fasteners onto the collecting pipe after cleaning to obtain a reusable adsorption device; (ⅴ) Reinstall the adsorption device back into the connecting pipe, and reassemble the obtained degaussing device back into the original pipeline; (ⅵ) After the accumulation of ferromagnetic impurities in the currently used degaussing path reaches the operation limit, re-execute steps (ⅰ)-(ⅴ).

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