ECT sensor and conical fluidized bed

Abstract

The ECT sensor comprises an electrode assembly, the electrode assembly comprises an insulating part and an electrode part, the insulating part is a trapezoidal insulating part, the electrode part is a trapezoidal electrode part, the insulating part comprises a first insulating surface, a plurality of positioning parts are arranged on the first insulating surface, and the positioning parts are arranged on the first insulating surface. All the positioning parts are connected with one another and define a trapezoidal positioning groove, and the electrode piece is installed in the trapezoidal positioning groove. According to the embodiment of the invention, the insulating part and the electrode part are trapezoidal, so that the trapezoidal electrode part and the trapezoidal insulating part can be matched with the internal space change of the conical fluidized bed, the detection precision of the electrode part is improved, and more comprehensive and accurate material distribution and flow information can be obtained.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to an ECT sensor and a conical fluidized bed. Background Technology

[0002] Fluidized beds are widely used in the pharmaceutical industry for processes such as particle drying, coating, and granulation. Process monitoring typically relies on traditional sensors (such as pressure, temperature, and humidity sensors) or offline sampling and analysis. However, these sensors and offline sampling and analysis methods cannot obtain real-time dynamic distribution information of the multiphase flow (such as particles and gas flow) within the fluidized bed, resulting in low process control accuracy, high energy consumption, and susceptibility to product quality problems caused by parameter fluctuations.

[0003] Currently, capacitance tomography (ECT) technology is increasingly used to monitor fluidized beds. ECT is a novel industrial process measurement technique that utilizes the characteristic that different substances have different dielectric constants. By detecting the dielectric constant distribution of substances in the test area, the material distribution of the test area's cross-section can be obtained. It is suitable for measuring mixtures composed of various non-conductive materials, such as two-phase / multiphase flows in the pharmaceutical, petrochemical, and food industries. It is a non-interference measurement method that can quickly display the spatial distribution of substances, making it a powerful tool for material distribution detection.

[0004] However, existing capacitance tomography (ECT) technology is usually designed for monitoring cylindrical test areas. The sensor shape is not adapted to the conical structure of fluidized beds, resulting in insufficient sensitivity at the top, severe signal attenuation at the edge areas, and insufficient imaging resolution. Utility Model Content

[0005] This invention provides an ECT sensor and a conical fluidized bed, aiming to solve the problem that the sensor shape of existing capacitance tomography technology is not adapted to the conical structure of the fluidized bed.

[0006] This utility model provides an ECT sensor applied to a conical fluidized bed. The ECT sensor includes an electrode assembly, which includes an insulating component and an electrode component. The insulating component is a trapezoidal insulating component, and the electrode component is a trapezoidal electrode component. The insulating component includes a first insulating surface, on which a plurality of positioning parts are provided. The positioning parts are interconnected and form a trapezoidal positioning groove. The electrode component is installed in the trapezoidal positioning groove.

[0007] Specifically, the insulating component is provided with an insulating hole, which is connected to the trapezoidal positioning groove.

[0008] Specifically, the insulating component further includes a second insulating surface disposed opposite to the first insulating surface, and the electrode assembly further includes a shielding layer disposed outside the second insulating surface.

[0009] Specifically, the electrode assembly also includes a circuit board, which is fixedly connected to the outside of the shielding layer.

[0010] Specifically, the shielding layer has shielding holes at the positions corresponding to the insulating holes, and the shielding holes are used for connecting the circuit board to the electrode components.

[0011] Specifically, the ECT sensor also includes a hopper, and the electrode assembly is disposed on the hopper.

[0012] Specifically, the side wall of the hopper is provided with a hopper groove, the insulating component is installed in the hopper groove and the electrode component is located inside the hopper groove, and the shielding layer is located outside the hopper groove.

[0013] Specifically, multiple hoppers are provided, and the number of electrode assemblies corresponds to the number of hoppers.

[0014] Specifically, the hopper is an annular hopper with a bottom diameter smaller than its top diameter.

[0015] This utility model embodiment also provides a conical fluidized bed, including the ECT sensor as described above.

[0016] This utility model provides an ECT sensor and a conical fluidized bed. The ECT sensor includes an electrode assembly, which includes an insulating component and electrode components. The insulating component is trapezoidal, and the electrode components are trapezoidal. The insulating component includes a first insulating surface with multiple positioning parts. These positioning parts are interconnected and form a trapezoidal positioning groove, in which the electrode components are installed. This embodiment, by setting both the insulating component and the electrode components to trapezoidal shapes, allows the trapezoidal electrode components and the trapezoidal insulating component to adapt to the internal spatial changes of the conical fluidized bed, improving the detection accuracy of the electrode components and obtaining more comprehensive and accurate material distribution and flow information. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram showing the connection between the insulating component and the electrode component in an ECT sensor provided for an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the electrode component;

[0020] Figure 3 This is a schematic diagram of the insulating component.

[0021] Figure 4 This is a schematic diagram of the shielding layer structure;

[0022] Figure 5 This is a structural diagram of the hopper;

[0023] Figure 6 A schematic diagram showing the connection between the electrode assembly and the hopper in an ECT sensor provided for an embodiment of this utility model;

[0024] Figure 7 This is a cross-sectional schematic diagram of an ECT sensor provided for an embodiment of the present invention.

[0025] Explanation of the markings in the image:

[0026] 1. Insulating component; 11. First insulating surface; 12. Second insulating surface; 13. Positioning part; 14. Trapezoidal positioning groove; 15. Insulating hole; 2. Electrode component; 3. Shielding layer; 31. Shielding hole; 4. Hopper; 41. Hopper groove; 5. Lead wire; 6. Radio frequency interface; 7. Protective layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0029] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0031] Please see Figure 1-3 This utility model provides an ECT sensor for use in a conical fluidized bed. The ECT sensor includes an electrode assembly, which includes an insulating component 1 and an electrode component 2. The insulating component 1 is a trapezoidal insulating component 1, and the electrode component 2 is a trapezoidal electrode component 2. The insulating component 1 includes a first insulating surface 11, on which a plurality of positioning parts 13 are provided. The positioning parts 13 are interconnected and form a trapezoidal positioning groove 14. The electrode component 2 is installed in the trapezoidal positioning groove 14.

[0032] In this embodiment, electrode 2 is used to detect changes in the electric field of the conical fluidized bed, and insulating component 1 is used to fix electrode 2. The conical shape of the conical fluidized bed causes its internal space to gradually narrow from top to bottom. By setting both insulating component 1 and electrode 2 to trapezoidal shapes, they can better adapt to the changes in the internal space of the conical fluidized bed. Compared with other shapes (such as rectangles), the trapezoidal structure of insulating component 1 allows for the reasonable arrangement of electrode 2 within a limited space. This ensures that electrode 2 gradually narrows from the top along the inner wall of the conical fluidized bed. The trapezoidal electrode 2, with its gradually decreasing size, can still fit the gradually narrowing space of the inner wall of the conical fluidized bed, ensuring a tight fit between electrode 2 and the inner wall of the conical fluidized bed. This avoids installation problems and detection blind spots caused by space mismatch, and allows for more accurate detection of changes in material concentration and flow rate in local areas, thereby obtaining more comprehensive and accurate material distribution and flow information.

[0033] In practical implementation, the insulating component 1 is made of zirconia ceramic (dielectric constant ≥30, temperature resistance ≥800℃, insulation performance better than 99.9%), which is injection molded and then sintered at high temperature, and the surface is polished to Ra≤1.6μm to avoid particle adhesion or microbial hiding, thus supporting CIP / SIP cleaning and sterilization. The electrode component 2 uses a 316L stainless steel substrate with a gold-plated surface (thickness 5μm) to improve conductivity and corrosion resistance. The overall shape of the insulating component 1 is trapezoidal. Multiple positioning parts 13 are provided on the first insulating surface 11 of the insulating component 1. The positioning parts 13 are interconnected in the middle area of ​​the first insulating surface 11 to form a trapezoidal positioning groove 14 with a top dimension larger than the bottom dimension. The trapezoidal electrode component 2 is installed in the trapezoidal positioning groove 14 to fix the electrode component 2. Each positioning part 13 protrudes from the first insulating surface 11, and each positioning part 13 and the four edges of the first insulating surface 11 are stepped. Among them, the positioning part 13 is a positioning rib.

[0034] Alternatively, the insulating component 1 can be configured as an outwardly protruding arc-shaped insulating component 1, that is, the first insulating surface 11 is located on the concave surface of the arc, and the electrode component 2 is also configured as an arc-shaped electrode component 2 accordingly, so that the electrode component 2 and the insulating component 1 fit more closely to the inner wall of the conical fluidized bed, thereby improving the detection quality of the electrode component 2.

[0035] Specifically, such as Figure 3 As shown, the insulating component 1 is provided with an insulating hole 15, which is connected to the trapezoidal positioning groove 14.

[0036] In this embodiment, the insulating hole 15 enables the connection between the electrode 2 and the external circuit, while ensuring the insulation performance between the electrode 2 and the insulating component 1. By connecting the insulating hole 15 to the trapezoidal positioning groove 14, the lead wire 5 of the electrode 2 can be connected to the external circuit through the insulating hole 15, avoiding interference between the lead wire 5 and other components, and improving the accuracy and stability of sensor signal transmission. The lead wire 5 of the electrode 2 can be an RF shielded wire, and the shape of the insulating hole 15 can be circular, square, etc., with the appropriate shape selected according to actual needs to meet connection and insulation requirements.

[0037] Specifically, such as Figure 2 As shown, the insulating component 1 also includes a second insulating surface 12 disposed opposite to the first insulating surface 11, and the electrode assembly also includes a shielding layer 3, which is disposed on the outside of the second insulating surface 12 (in conjunction with...). Figure 6 (As shown).

[0038] In this embodiment, the shielding layer 3 can shield external electromagnetic interference, protecting the electric field signal inside the electrode 2 from external interference. By placing the shielding layer 3 outside the second insulating surface 12, it effectively surrounds the electrode 2, forming a relatively closed electromagnetic shielding space. This ensures the signal detected by the electrode 2 is authentic and reliable, improving the accuracy of sensor detection. This embodiment, by setting the shielding layer 3, greatly reduces the impact of external electromagnetic interference on the sensor's detection results, improves the sensor's anti-interference capability and detection accuracy, and enables the sensor to operate stably in complex electromagnetic environments.

[0039] In practical implementation, the shielding layer 3 is made of 316L stainless steel, which is corrosion-resistant, has high mechanical strength, and meets pharmaceutical industry hygiene standards. It is precision-machined using a five-axis machine tool to achieve a surface roughness Ra ≤ 3.2μm. The shielding layer 3 is also designed as a trapezoidal shielding layer 3, with a cross-sectional area larger than that of the insulating component 1, ensuring that the entire shielding layer 3 completely covers the insulating component 1. Alternatively, the shielding layer 3 can be designed as an outwardly convex arc-shaped shielding layer 3 (see reference). Figure 4 In (b)), the concave side of the arc is close to the second insulating surface 12, and the convex side of the arc is far away from the second insulating surface 12, so that the arc-shaped shielding layer 3 fits more closely to the inner wall of the conical fluidized bed in subsequent use.

[0040] Specifically, the electrode assembly also includes a circuit board, which is fixedly connected to the outside of the shielding layer 3.

[0041] In this embodiment, the circuit board is used to process and transmit the signal detected by the electrode 2. The circuit board is fixedly connected to the outside of the shielding layer 3, facilitating the connection between the circuit board and the electrode 2 and making the signal transmission path more efficient. In practice, the signal detected by the electrode 2 is transmitted to the circuit board via the lead wire 5 and the insulating hole 15. The circuit board amplifies, filters, and converts the signal before transmitting it to an external device for further analysis and display. The type of circuit board can be selected according to the specific functional requirements of the ECT sensor, such as using a printed circuit board (PCB) or a flexible printed circuit board (FPC).

[0042] Specifically, such as Figure 4 As shown, the shielding layer 3 has a shielding hole 31 at the position corresponding to the insulating hole 15. The shielding hole 31 is used for connecting the circuit board to the electrode component 2 (in conjunction with...). Figure 7 (As shown).

[0043] In this embodiment, by setting a shielding hole 31 at the position corresponding to the insulating hole 15 in the shielding layer 3, the lead wire 5 of the electrode 2 can pass through the insulating hole 15 and the shielding hole 31 to connect with the circuit board. While achieving the connection, it also avoids damaging the structure of the shielding layer 3 and reducing the shielding effect, effectively reducing the impact of external interference on signal transmission, and improving the detection accuracy and stability of the sensor. The shape of the shielding hole 31 can be circular, square, etc., and a suitable shape can be selected according to actual needs to meet the connection requirements.

[0044] Specifically, such as Figure 5-6 As shown, the ECT sensor also includes a hopper 4, and the electrode assembly is disposed on the hopper 4.

[0045] In this embodiment, the electrode assembly is placed on the hopper 4, so that the ECT sensor can directly detect the material in the hopper 4. When there is material in the hopper 4, the presence of the material will cause a change in the electric field distribution. The electrode 2 of the electrode assembly installed on the hopper 4 can detect these changes in electric field and transmit the signal to the circuit board for processing, thereby obtaining relevant information about the material.

[0046] Specifically, such as Figure 5-6 As shown, a hopper groove 41 is provided through the side wall of the hopper 4, the insulating component 1 is installed in the hopper groove 41 and the electrode component 2 is located inside the hopper groove 41, and the shielding layer 3 is located outside the hopper groove 41.

[0047] In this embodiment, the hopper trough 41 is used to install the insulating component 1. In order to make the insulating component 1 fit tightly with the hopper trough 41, the shape of the hopper trough 41 is set according to the shape of the insulating component 1. Since the first insulating surface 11 of the insulating component 1 has a trapezoidal positioning groove, and the trapezoidal positioning groove protrudes from the first insulating surface, the periphery of the trapezoidal positioning groove and the periphery of the first insulating surface form a step. In order to make the insulating component 1 stably installed in the hopper trough 41 and to make the inner wall of the hopper 4 flat, the hopper trough 41 is divided into an inner groove and an outer groove. The inner groove is set in the middle area of ​​the outer groove, and the groove area of ​​the inner groove is set to be smaller than the groove area of ​​the outer groove, so that the groove edges of the inner groove and the outer groove are step edges. The insulating component 1 is installed from the outer groove, the trapezoidal positioning groove is located in the inner groove, and the top of the trapezoidal positioning groove 14 abuts against the groove edge of the inner groove. The second insulating surface 12 is located in the outer groove, so that the inner wall of the hopper 4 can be flattened.

[0048] In specific implementation, the electrode 2 is first fixed to the trapezoidal positioning groove 14 of the insulating component 1 with sealant to form an assembly. The assembly is then installed in the hopper trough 41, with the first insulating surface 11 where the electrode 2 is installed located inside the hopper trough 41. The shielding layer 3 is then installed on the outside of the second insulating surface 12 of the insulating component 1, also located outside the hopper trough 41. High-temperature sealant (400℃ resistant) is then applied to the connection between the insulating component 1 and the hopper trough 41, as well as the connection between the shielding layer 3 and the hopper trough 41. Penetrant testing (PT) can then be used to ensure the integrity of the inner wall. Figure 7 As shown, lead wire 5 is soldered to the side of electrode 2 near insulating hole 15, and lead wire 5 is extended so that it can pass through insulating hole 15 to the outlet of shielding hole 31 (i.e., the outlet away from insulating component 1). RF interface 6 is provided at the outlet of shielding hole 31 and fixed with screws. The circuit board is then fixed to the outer wall of shielding layer 3 with screws, establishing a connection between the electrode plate and the circuit board through RF interface 6 and lead wire 5. In specific implementation, after soldering lead wire 5, a protective layer 7 is provided on the outer layer, i.e., heat shrink tubing (withstanding 600V) can be applied for protection. After electrode 2 is fixed, it is coated with polytetrafluoroethylene (PTFE) to achieve anti-particle adhesion, insulation, and chemical inertness. In this embodiment, by installing insulating component 1 in hopper trough 41, electrode 2, located inside hopper trough 41, can directly contact the material in hopper 4, accurately detecting changes in the electric field caused by the material. Shielding layer 3, located outside hopper trough 41, effectively shields against external interference, ensuring the accuracy of the detection signal.

[0049] Specifically, multiple hopper troughs 41 are provided, and the number of electrode assemblies corresponds to the number of hopper troughs 41.

[0050] In this embodiment, multiple hopper troughs 41 and corresponding electrode assemblies can achieve multi-angle and multi-position detection of materials within the hopper 4, obtaining more comprehensive material information. When the ECT sensor is working, each electrode assembly detects the electric field changes at various locations in the conical fluidized bed. After integrating and processing multiple detection signals, the distribution and flow state of the materials within the hopper 4 can be more accurately reflected. In specific implementation, eight radio frequency interfaces 6 can be set on the hopper 4 according to the electrode distribution, and the diameter of the radio frequency interface 6 can be 35-40mm.

[0051] Specifically, such as Figure 5 As shown, hopper 4 is an annular hopper with a bottom diameter smaller than its top diameter.

[0052] In this embodiment, an annular hopper with a bottom diameter smaller than its top diameter is used. This allows the annular hopper to adapt to the internal space variations of the conical fluidized bed. When the material flows within the hopper 4, it can pass through the detection area of ​​the electrode assembly more evenly, improving the accuracy and stability of the detection results. Furthermore, the annular hopper structure facilitates the installation of multiple electrode assemblies, which are distributed around the annular shape of the hopper 4, enabling comprehensive detection of the material.

[0053] In practical implementation, electromagnetic simulation can be performed based on the shape of the hopper 4 and the actual application conditions. Through sensitive field matrix analysis, the number and spacing of the electrodes 2 and the structure of the shielding layer 3 can be determined. Electromagnetic performance is optimized by maximizing signal strength and suppressing noise. Since the ECT (Electronic Capacitance Tomography) system can improve the quality of image reconstruction, the sensitive field matrix can be used to explain the influence of the dielectric constant variation of each pixel unit in the ECT system on the measured capacitance. Specifically, S... ij (k) represents the rate of change of capacitance between electrodes i and j when the dielectric constant of the k-th pixel unit changes. The sensitive field distribution function can be calculated using the following formula:

[0054]

[0055] Among them, C ij It is the capacitance between electrodes i and j, ε k It is the dielectric constant of the k-th pixel unit. For ease of analysis and calculation, the sensitive field matrix is ​​usually normalized. The normalized sensitive field matrix S... ij The formula for calculating (k) is:

[0056]

[0057] Among them, S avg It is the average value of all sensitive field values;

[0058] Then utilize the uniformity error S vpThe uniformity of the sensitive field matrix is ​​evaluated using the following formula:

[0059]

[0060] Where σ s This represents the standard deviation of the sensitive field matrix. A smaller uniformity error indicates a more uniform sensitive field distribution. By analyzing the distribution of the sensitive field matrix, design parameters of the ECT sensor, such as the number, location, and coverage of electrodes 2, can be optimized to improve imaging quality. For example, increasing electrode coverage or adjusting the arrangement of electrodes 2 can improve the uniformity of the sensitive field distribution.

[0061] This utility model embodiment also provides a conical fluidized bed, including the ECT sensor as described above.

[0062] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An ECT sensor applied in a conical fluidized bed, the ECT sensor comprising an electrode assembly, the electrode assembly comprising an insulating element and electrode elements, characterized in that, The insulating component is a trapezoidal insulating component, and the electrode component is a trapezoidal electrode component. The insulating component includes a first insulating surface, on which a plurality of positioning parts are provided. The positioning parts are interconnected and form a trapezoidal positioning groove, and the electrode component is installed in the trapezoidal positioning groove.

2. The ECT sensor according to claim 1, characterized in that, The insulating component is provided with an insulating hole, which is connected to the trapezoidal positioning groove.

3. The ECT sensor according to claim 2, characterized in that, The insulating component further includes a second insulating surface disposed opposite to the first insulating surface, and the electrode assembly further includes a shielding layer disposed outside the second insulating surface.

4. The ECT sensor according to claim 3, characterized in that, The electrode assembly also includes a circuit board, which is fixedly connected to the outside of the shielding layer.

5. The ECT sensor according to claim 4, characterized in that, The shielding layer has shielding holes at the positions corresponding to the insulating holes, and the shielding holes are used for connecting the circuit board to the electrode components.

6. The ECT sensor according to claim 5, characterized in that, The ECT sensor also includes a hopper, and the electrode assembly is disposed on the hopper.

7. The ECT sensor according to claim 6, characterized in that, The hopper has a hopper groove extending through its side wall. The insulating component is installed in the hopper groove, and the electrode component is located inside the hopper groove. The shielding layer is located outside the hopper groove.

8. The ECT sensor according to claim 7, characterized in that, Multiple hoppers are provided, and the number of electrode assemblies corresponds to the number of hoppers.

9. The ECT sensor according to claim 6, characterized in that, The hopper is an annular hopper with a bottom diameter smaller than its top diameter.

10. A cone-shaped fluidized bed, characterized in that, Including the ECT sensor as described in any one of claims 1-9.

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