Drop-proof electromagnetic flowmeter

Abstract

The utility model discloses an anti -drop's electromagnetic flowmeter relates to flowmeter technical field. The anti -drop's electromagnetic flowmeter, including converter end cover, converter end cover surface center fixedly connected with display screen, inside rotationally connected with converter main part, the converter main part bottom fixedly connected with the installation boss, and the inside fixedly connected with the connection main body of installation boss, and the connection main body is through with converter main part, the connection main body is fixedly connected with the connection flange disc of upper and lower split type on the side away from boss, and the lower layer connection flange disc bottom fixedly connected with the casing. The anti -drop's electromagnetic flowmeter, four ground screws not only realize electrical grounding, still through the mechanical penetration with the connection main body, forms the additional radial support point, reduces the swing amplitude of casing, and the rotation connection cooperation limiting buckle of converter end cover and main part prevents the parameter drift caused by the accidental loosening of adjusting knob, and the calibration period is prolonged to 2 times of traditional equipment.

Description

Technical Field

[0001] This utility model relates to the field of flow meter technology, and in particular to an electromagnetic flow meter that is resistant to falling. Background Technology

[0002] Traditional electromagnetic flowmeters generally use a single flange connection structure, and their vibration resistance can only meet the conditions of ≤5g. In strong vibration environments such as pump outlets and compressors, the flange nuts are prone to loosening, causing the sensor to detach from the pipeline, resulting in leakage or shutdown accidents.

[0003] For example, statistics from the chemical industry show that vibration-induced flowmeter failures account for 37% of all failures. Furthermore, existing products lack multi-stage mechanical limit designs, and their axial tensile strength is generally below 7kN, failing to meet the installation requirements of high-pressure pipelines. Traditional single-pole excitation methods result in a magnetic field uniformity of less than 90% across the pipe cross-section, leading to a measurement error of ±1.5%. When fluid conductivity changes abruptly (such as in chemical mixing processes), the linear relationship between induced electromotive force and flow velocity is disrupted, further amplifying the error. Alternating magnetic fields generated by frequency converters, motors, and other equipment in industrial environments can superimpose interference noise of over 0.5mV onto the measurement signal. This leads to an increased false alarm rate. In non-full pipe conditions, the electrodes cannot be fully submerged, resulting in a 23% probability of signal interruption. When the gas content exceeds 5%, the measurement error can exceed 20%. Traditional lining materials (such as ordinary rubber) can only withstand media with pH 2-12. In strong acid (such as concentrated sulfuric acid) or strong alkali (such as sodium hydroxide) environments, their lifespan is less than 6 months. Replacing the lining requires disassembling the pipeline, and a single maintenance takes more than 4 hours. Moreover, the calibration cycle is short (usually 6 months), leading to increased downtime losses. The excitation coil material limits its operation to environments ranging from -20℃ to +60℃, which cannot meet the needs of high-temperature scenarios such as metallurgy and food processing. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide an electromagnetic flowmeter that is resistant to falling, thereby solving the above-mentioned problem.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an anti-fall electromagnetic flowmeter, including a converter end cover, wherein a display screen is fixedly connected to the center of the surface of the converter end cover, and a converter body is rotatably connected inside the end cover;

[0006] The bottom of the converter body is fixedly connected to a mounting boss, and a connecting body is fixedly connected inside the mounting boss, with the connecting body communicating with the converter body.

[0007] The connecting body is fixedly connected to a split connecting flange on the side away from the boss, and a housing is fixedly connected to the bottom of the lower connecting flange; a lining is fixedly connected inside the housing, and a magnetic pole is fixedly connected horizontally to the inner side of the lining, and a U-shaped magnet with an excitation coil wound around it is fixedly connected vertically.

[0008] Preferably, the converter body is rotatably connected inside the converter end cover, and the bottom of the converter body is connected to the connecting flange via double mounting bosses. The connecting flange has an upper and lower split structure, and an orthogonal magnetic field system is set inside the housing.

[0009] Preferably, the converter adjustment device inside the converter body is divided into two parts: positive adjustment and negative adjustment. Both ends extend to the outside of the body and are connected to adjustment knobs with anti-slip textures. The adjustment knobs need to be pressed and rotated to take effect.

[0010] Preferably, the mounting boss is a stepped limiting structure with a chamfer at the end of the boss, and four grounding screws are arranged in a circular array around the boss and are mechanically connected to the main body.

[0011] Preferably, an anti-loosening nut is provided in the threaded hole of the connecting flange, the lower flange is fixedly connected to the shell, and the connecting platforms at both ends of the shell are rigidly connected to the pipeline through mounting holes.

[0012] Preferably, the lining inside the housing is made of polytetrafluoroethylene or ceramic material, and the magnetic poles are fixed horizontally on the inner side of the lining, with the electrodes flush with the surface of the lining.

[0013] Preferably, the grounding screw and the connecting body form an equipotential grounding system with a grounding resistance ≤ 5Ω, and the connecting body integrates a signal shielding layer.

[0014] Preferably, the grounding screw and the connecting body form an equipotential grounding system with a grounding resistance ≤ 5Ω, and the connecting body integrates a signal shielding layer.

[0015] Preferably, the converter body and the housing are quickly assembled and disassembled via a connecting body, and the lining and magnetic poles adopt a modular design, which can be replaced without disassembling the pipes.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This anti-fall electromagnetic flowmeter features a split upper and lower connecting flange with annular array nuts, which improves vibration resistance by 50% compared to traditional single-flange structures. It maintains installation stability even in environments with strong vibrations, such as pump outlets. The stepped design and chamfered structure of the boss enable axial tensile strength ≥20kN, which is 3 times higher than that of ordinary straight-cylinder installation structures. The four grounding screws not only achieve electrical grounding but also form additional radial support points through mechanical connection with the main body, reducing the swing amplitude of the housing. The rotary connection between the converter end cover and the main body, along with the limit buckle, prevents the adjustment knob from accidentally loosening and causing parameter drift, extending the calibration cycle to twice that of traditional equipment.

[0018] 2. This anti-fall electromagnetic flowmeter, with its equipotential grounding system and shielded cable, suppresses external electromagnetic interference to below 0.1mV, ensuring stable operation even near strong interference sources such as frequency converters and motors. The positive / negative adjustment knobs allow independent adjustment of gain and zero point, enabling rapid calibration under complex conditions (such as sudden changes in fluid conductivity) with a response time of <5 seconds. The lining can be made of materials such as PTFE or ceramics, and can withstand acidic and alkaline media with pH values ​​of 1-14, making it suitable for highly corrosive environments such as chemical and metallurgical industries. The excitation coil uses high-temperature resistant enameled wire, allowing stable operation in environments ranging from -40℃ to 120℃, representing a 30% wider operating range compared to ordinary electromagnetic flowmeters. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of an electromagnetic flowmeter designed to prevent falling.

[0021] Figure 2 This is a schematic diagram of an electromagnetic flowmeter designed to prevent falling.

[0022] Figure 3 This is a schematic diagram of an electromagnetic flowmeter designed to prevent falling.

[0023] Figure 4 This is a schematic diagram of an electromagnetic flowmeter designed to prevent falling.

[0024] Reference numerals: 1. Converter end cover; 2. Display screen; 3. Converter body; 4. Converter adjustment device; 5. Adjustment knob; 6. Mounting boss; 7. Boss; 8. Grounding screw; 9. Connecting body; 10. Threaded hole; 11. Connecting flange; 12. Nut; 13. Housing; 14. Connecting platform; 15. Lining; 16. U-shaped magnet; 17. Excitation coil; 18. Magnetic pole; 19. Mounting hole. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0028] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0029] Please see Figure 1-4 This utility model provides a technical solution: an anti-fall electromagnetic flowmeter includes a converter end cover 1, and a display screen 2 is fixedly connected to the center of the surface of the converter end cover 1.

[0030] The converter body 3 is rotatably connected inside the converter end cover 1. The converter body 3 is fixedly connected inside the converter adjustment device 4. The two ends of the converter adjustment device 4 extend beyond the converter body 3. The converter adjustment device 4 is divided into positive adjustment and negative adjustment. One end of the converter adjustment device 4 is fixedly connected to the adjustment knob 5. The adjustment knob 5 is distributed on both sides of the converter body 3.

[0031] A mounting boss 6 is fixedly connected to the bottom of the converter body 3. A connecting body 9 is fixedly connected inside the mounting boss 6. The connecting body 9 and the converter body 3 are interconnected. A boss 7 is fixedly connected to the end of the mounting boss 6 away from the converter body. The end of the boss 7 away from the mounting boss 6 is chamfered.

[0032] A grounding screw 8 is fixedly connected to the surface of the boss 7. Four grounding screws 8 are arranged in a ring array around the boss 7. The grounding screws 8 are interconnected with the connecting body 9.

[0033] A connecting flange 11 is fixedly connected to the side of the connecting body 9 away from the boss. The connecting flange 11 is divided into upper and lower parts. Threaded holes 10 are opened on the surface of the connecting flange 11. The threaded holes 10 are arranged in a circular array. Nuts 12 are rotatably connected inside the threaded holes 10.

[0034] The lower connecting flange 11 is fixedly connected to the housing 13 at the bottom;

[0035] The housing 13 is fixedly connected to both ends of the connecting platform 14, and the surface of the connecting platform 14 is provided with mounting holes 19.

[0036] A liner 15 is fixedly connected inside the housing 13, and a magnetic pole 18 is fixedly connected horizontally on the inner side of the liner 15.

[0037] A U-shaped magnet 16 is fixedly connected vertically to the inner side of the housing 13. An excitation coil 17 is wound around the U-shaped magnet 16, and the center of the excitation coil 17 is aligned with the component part.

[0038] Working principle: The U-shaped magnet 16 vertically positioned inside the housing 13 forms a centrally symmetrical magnetic field with the wound excitation coil 17. When the excitation coil 17 is energized, the U-shaped magnet 16 generates a stable alternating magnetic field, the intensity of which is precisely controlled by the excitation current.

[0039] The horizontally fixed magnetic poles 18 on the inner side of the lining 15 and the U-shaped magnet 16 form an orthogonal magnetic field structure, so that the magnetic field uniformly covers the entire cross section of the measuring pipe. When a conductive liquid (such as sewage or slurry) flows through the shell 13, the charged particles in the liquid cut the magnetic field lines and generate an induced electromotive force in the direction perpendicular to the magnetic field.

[0040] The induced electromotive force is led out through electrodes (not shown) inside the liner 15 and conducted to the converter body 3 via the connecting body 9. The design of the electrodes being flush with the liner 15 avoids fluid disturbance and ensures signal stability.

[0041] The converter adjustment device 4 inside the converter body 3 amplifies, filters, and performs analog-to-digital conversion on the weak induced electromotive force, and finally displays parameters such as instantaneous flow rate and cumulative flow rate in real time on the display screen 2.

[0042] The converter adjustment device 4 is divided into positive adjustment and negative adjustment parts. The signal gain and zero-point offset can be adjusted respectively by the adjustment knobs 5 on both sides. For example, when the pipeline is empty, rotating the negative adjustment knob 5 can trigger automatic zero-point calibration to eliminate zero drift caused by environmental interference.

[0043] The four grounding screws 8 on the surface of the boss 7 are connected to the connecting body 9, which makes the flow meter housing, fluid and pipe flange equipotentially connected. The grounding resistance is ≤10Ω, which effectively suppresses external electromagnetic interference.

[0044] The split design, combined with the annular array of threaded holes 10 and nuts 12, achieves a rigid connection with the pipeline. Nuts 12 feature an anti-loosening thread design, maintaining tightening torque even under vibration.

[0045] The double-protrusion structure forms a stepped limit, and the chamfered design of protrusion 7 facilitates quick alignment of the pipe during installation, reducing installation stress. The connecting body 9 inside the mounting protrusion 6 is connected to the converter body 3, enhancing the overall structural strength.

[0046] The converter end cap 1 is connected to the converter body 3 by rotation. After the adjustment knob 5 is adjusted, the angle can be locked by the limit buckle (not shown) to prevent accidental rotation from causing parameter deviation.

[0047] The lining 15 inside the housing 13 is made of corrosion-resistant polytetrafluoroethylene or ceramic material, which not only isolates the fluid from direct contact with the metal housing, but also prevents the electrodes from being corroded and extends the service life of the equipment.

[0048] The connecting platforms 14 at both ends of the housing 13 are fixed to the pipeline through the mounting holes 19 to ensure that the fluid completely fills the measuring tube. If the pipeline is not full, the change in the magnetic field of the excitation coil 17 will trigger an empty pipe alarm and the abnormality will be indicated on the display screen 2.

[0049] Structural Description:

[0050] Converter end cap 1: The display screen 2 is fixedly connected to the center of the surface. The internal part is rotatably connected to the converter body 3 and cooperates with the limit buckle (not shown). It protects the internal structure of the converter body 3 and can adjust the operating angle by rotation. After adjustment, it is locked by the limit buckle to prevent accidental rotation from causing parameter deviation and extend the calibration cycle to twice that of traditional equipment.

[0051] Display screen 2: Fixed to the center of the surface of the converter end cover 1, used to display parameters such as instantaneous flow rate and cumulative flow rate in real time, and to provide an empty pipe alarm when the pipe is not full.

[0052] Converter body 3: The converter adjustment device 4 is fixedly connected inside, and the mounting boss 6 is fixedly connected at the bottom. It is connected to the housing 13 through the connecting body 9. As the core load-bearing structure of the converter, it not only accommodates the adjustment device and conducts the induced electromotive force signal, but also can be quickly disassembled and assembled with the housing 13 through the connecting body 9. When replacing the liner 15 or the electrode, there is no need to disassemble the pipeline, which reduces the maintenance time to 1 / 3 of the traditional equipment.

[0053] The converter adjustment device 4 is divided into positive and negative adjustment parts. Both ends extend beyond the converter body 3 and one end is connected to the adjustment knob 5. It can amplify, filter and convert weak induced electromotive force. The positive and negative adjustment parts can independently adjust the signal gain and zero offset, and achieve rapid calibration under complex working conditions (such as sudden changes in fluid conductivity). The response time is <5 seconds.

[0054] Adjustment knobs 5: Located on both sides of the converter body 3, they feature a non-slip textured design and require pressing before rotation to activate. The positive adjustment knob 5 adjusts the signal gain, while the negative adjustment knob 5 adjusts the zero-point offset (such as triggering automatic zero-point calibration in empty tube conditions to eliminate zero drift). The non-slip and press-to-rotate design prevents accidental touches that could lead to parameter errors.

[0055] Mounting boss 6: Fixed to the bottom of the converter body 3, internally fixedly connected to the connecting body 9, and the end away from the converter body is fixedly connected to the boss 7 to form a stepped structure, forming a double stepped limit with the boss 7, which increases the axial tensile strength to ≥20kN (3 times higher than the ordinary straight cylinder structure). The internal connection body 9 can enhance the overall structural strength.

[0056] Boss 7: Fixed to the end of the mounting boss 6 away from the converter body, with 4 grounding screws 8 fixedly connected to the surface. The end away from the mounting boss 6 is chamfered. The chamfer design facilitates quick alignment of the pipe during installation to reduce installation stress. At the same time, it cooperates with the mounting boss 6 to form a stepped limit, enhancing installation stability.

[0057] Grounding screws 8: Four screws are arranged in a ring array around the boss 7 and are interconnected with the connecting body 9. This not only achieves equipotential connection between the flow meter housing, fluid and pipe flange (grounding resistance ≤5Ω, in accordance with GB / T18659-2002 standard), effectively suppresses external electromagnetic interference (controlling interference below 0.1mV), and prevents lightning strikes and static electricity hazards, but also forms an additional radial support point through mechanical connection with the connecting body 9, reducing the swing amplitude of the housing 13.

[0058] Connecting body 9: Fixed inside the mounting boss 6, communicating with the converter body 3, and fixedly connected to the connecting flange 11 on the side away from the boss, serving as a signal transmission channel (conducting the induced electromotive force from the electrode to the converter body 3). At the same time, it connects the converter body 3 and the connecting flange 11 to enhance the overall structural strength and realize quick assembly and disassembly of the converter and the housing, simplifying the maintenance process.

[0059] Threaded holes 10: are formed on the surface of the connecting flange 11 in a ring array, and are used to rotate and connect nuts 12, providing a mounting position for nuts 12. The nuts 12 are used to achieve rigid fixation between the connecting flange 11 and the pipeline.

[0060] Connection flange 11: It is divided into upper and lower parts. The surface has a ring array of threaded holes 10. The lower part is fixedly connected to the housing 13. The upper and lower split design, together with the threaded holes 10 and nuts 12, realizes a rigid connection with the pipeline. The vibration resistance is improved by 50% compared with the traditional single flange structure, and it is suitable for strong vibration environments such as pump outlet.

[0061] Nut 12: Rotatably connected inside the threaded hole 10, with an anti-loosening thread design. It fastens the flange 11 to the pipe by mating with the threaded hole 10. The anti-loosening design ensures that the fastening torque can still be maintained in the vibration environment to prevent the equipment from falling.

[0062] Housing 13: Made of aluminum alloy, with connecting platforms 14 fixedly connected at both ends, and lining 15 fixedly connected inside. The bottom of the lower connecting flange 11 is fixed to it. As the load-bearing housing of the flow meter, the overall weight is reduced by 40% compared with steel products, but the single-stage load capacity reaches 1.5 tons, which meets the installation requirements of DN50-DN300 diameter pipelines, while protecting the internal lining 15, magnets and other components.

[0063] Connecting platform 14: Fixed to both ends of housing 13, with mounting holes 19 on its surface. It is fixed to the pipeline through the mounting holes 19 to ensure that the fluid completely fills the measuring tube and to ensure measurement accuracy.

[0064] Liner 15: Fixed inside the shell 13, made of corrosion-resistant materials such as polytetrafluoroethylene or ceramics, with magnetic poles 18 fixedly connected horizontally on the inner side. It not only isolates the fluid from direct contact with the metal shell 13, preventing the shell 13 and electrodes from being corroded (suitable for acid and alkaline media with pH 1-14, such as highly corrosive environments in chemical and metallurgical industries), but also has high wear resistance (up to 120mg / 1000 rpm, CS-17 grinding wheel test). Its service life in slurry containing solid particles is twice that of traditional rubber lining 15.

[0065] U-shaped magnet 16: Fixed vertically inside the housing 13, with excitation coil 17 wound on it, forming a centrally symmetrical magnetic field with the excitation coil 17, providing a magnetic field basis for measurement, and forming an orthogonal magnetic field structure with the horizontal magnetic pole 18, so that the magnetic field uniformity of the pipe cross section reaches more than 98%, reducing the measurement error to ±0.5%.

[0066] Excitation coil 17: It is wound around the U-shaped magnet 16 and is centrally symmetrically distributed. It uses high-temperature resistant enameled wire. When energized, it makes the U-shaped magnet 16 generate a stable alternating magnetic field (the magnetic field strength is precisely controlled by the excitation current). Its high-temperature resistant design allows it to work stably in environments from -40℃ to 120℃, which is 30% wider than the temperature application range of ordinary electromagnetic flowmeters.

[0067] Magnetic pole 18: Fixed in the horizontal direction inside the lining 15, forming an orthogonal magnetic field structure with the U-shaped magnet 16, so that the magnetic field uniformly covers the entire cross section of the measuring pipe, ensuring that a stable induced electromotive force is generated when charged particles in the fluid cut the magnetic lines of force, thereby improving the measurement accuracy.

[0068] Mounting hole 19: It is formed on the surface of the connecting platform 14 to provide a mounting position for fixing the connecting platform 14 to the pipe, ensuring a stable connection between the housing 13 and the pipe, and avoiding measurement deviation or equipment falling due to loose installation.

[0069] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A drop-proof electromagnetic flowmeter, comprising a converter end cap (1), characterized in that: The converter end cap (1) is fixedly connected to the center of the surface of the display screen (2), and the converter body (3) is rotatably connected inside. The bottom of the converter body (3) is fixedly connected to a mounting boss (6), and a connecting body (9) is fixedly connected inside the mounting boss (6). The connecting body (9) is in communication with the converter body (3). The connecting body (9) is fixedly connected to a split connecting flange (11) on the side away from the boss, and the bottom of the lower connecting flange (11) is fixedly connected to a shell (13). The housing (13) is fixedly connected to a liner (15), and a magnetic pole (18) is fixedly connected to the inner side of the liner (15) in the horizontal direction, and a U-shaped magnet (16) with an excitation coil (17) is fixedly connected in the vertical direction.

2. The anti-drop electromagnetic flowmeter according to claim 1, characterized in that: The converter end cap (1) is rotatably connected to the converter body (3). The bottom of the converter body (3) is connected to the connecting flange (11) through the mounting boss (6) and the boss (7). The connecting flange (11) is divided into upper and lower split structures. An orthogonal magnetic field system is set inside the housing (13).

3. The anti-drop electromagnetic flowmeter according to claim 2, characterized in that: The converter adjustment device (4) inside the converter body (3) is divided into positive adjustment and negative adjustment. Both ends extend to the outside of the body and are connected to the adjustment knob (5) with anti-slip texture. The adjustment knob (5) needs to be pressed and rotated to take effect.

4. The anti-drop electromagnetic flowmeter according to claim 3, characterized in that: The mounting boss (6) is a stepped limiting structure. The end of the boss (7) is chamfered. Four grounding screws (8) are arranged in a ring array around the boss (7) and are mechanically connected to the connecting body (9).

5. The anti-drop electromagnetic flowmeter according to claim 4, characterized in that: Anti-loosening nuts (12) are installed in the threaded holes (10) of the connecting flange (11). The lower flange is fixedly connected to the shell (13). The connecting platforms (14) at both ends of the shell (13) are rigidly connected to the pipeline through the mounting holes (19).

6. The anti-drop electromagnetic flowmeter according to claim 5, characterized in that: The lining (15) inside the housing (13) is made of polytetrafluoroethylene or ceramic material. Magnetic poles (18) are fixed horizontally on the inner side of the lining (15), and the electrodes are flush with the surface of the lining (15).

7. The anti-drop electromagnetic flowmeter according to claim 6, characterized in that: The grounding screw (8) and the connecting body (9) form an equipotential grounding system with a grounding resistance ≤5Ω. The connecting body (9) has an integrated signal shielding layer inside.

8. The anti-drop electromagnetic flowmeter according to claim 7, characterized in that: The converter body (3) and housing (13) can be quickly disassembled and assembled via connecting body (9). The lining (15) and magnetic pole (18) adopt a modular design and can be replaced without disassembling the pipes.

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