Corrosion-resistant electromagnetic flowmeter

Abstract

The utility model relates to a corrosion-resistant electromagnetic flowmeter. Two ends of the measuring pipeline are respectively provided with a left-end flange and a right-end flange, the measuring pipeline, the left-end flange and the right-end flange are made of engineering plastics and are of an integrated injection molding structure, and an upper measuring electrode and a lower measuring electrode which are longitudinally opposite are arranged in the middle of the top wall and the middle of the bottom wall of the measuring pipeline; the device further comprises a front shell and a rear shell which clamp the measuring pipeline in the middle, coil supports are arranged in the front shell and the rear shell, excitation coils are installed on the coil supports, and the two excitation coils are located in front of the middle of the measuring pipeline and behind the middle of the measuring pipeline respectively. A front half flange plate is arranged at the top of the front shell, a rear half flange plate is arranged at the top of the rear shell, the front half flange plate and the rear half flange plate form a top flange when the front shell and the rear shell are assembled in a butt joint mode, the gauge head is provided with a display screen in the front and a gauge head support at the bottom, and the bottom of the gauge head support is fixedly connected with the top flange. According to the corrosion-resistant electromagnetic flowmeter, the corrosion-resistant capacity is improved on the basis that the structural characteristics of the flowmeter body are guaranteed.

Description

Technical Field

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

[0002] Electromagnetic flow meters are widely used in various industrial settings to measure the flow rate of fluids in pipelines. Their operating principle is as follows: an excitation coil inside the flow meter generates a uniform and regular magnetic field. The induced electromotive force (EMF) in the conductive fluid as it passes through this magnetic field measures the flow rate. This induced EMF is detected by measuring electrodes on the flow meter. The controller calculates the fluid flow rate based on the magnitude of the induced EMF, the flow meter's dimensions, and the strength of the excitation magnetic field. However, when electromagnetic flow meters are used to measure the flow of corrosive liquids such as acids and alkalis, corrosion becomes a problem. The corrosive liquid corrodes the inner wall of the measuring pipe, damaging the flow meter's structure.

[0003] Existing electromagnetic flowmeters address the aforementioned problems by installing a bushing on the inner wall of the measuring pipe. However, this leads to difficulties in the manufacturing and assembly of the electromagnetic flowmeter. The bushing installation method also affects the positional accuracy of structures such as the measuring electrodes, thus impacting measurement accuracy. Therefore, it is necessary to optimize the structural design of the electromagnetic flowmeter to solve the aforementioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a corrosion-resistant electromagnetic flowmeter that improves corrosion resistance while maintaining the structural characteristics of the meter body.

[0005] The technical solution adopted by this utility model is as follows: a corrosion-resistant electromagnetic flowmeter includes a measuring pipe with a left flange and a right flange at both ends, all three being made of engineering plastic and integrally injection molded. Two longitudinally aligned measuring electrodes are provided in the middle of the top and bottom walls of the measuring pipe. It also includes a front housing and a rear housing that clamp the measuring pipe in the middle. Coil supports are provided inside both the front and rear housings, and excitation coils are installed on the coil supports. The two excitation coils are located in front of and behind the middle of the measuring pipe, respectively. A front half flange plate is provided on the top of the front housing, and a rear half flange plate is provided on the top of the rear housing. When the front and rear housings are assembled together, the front half flange plate and the rear half flange plate form a top flange. It also includes a meter head with a display screen at the front and a meter head support at the bottom, with the bottom of the meter head support fixedly connected to the top flange.

[0006] Preferably, the front and rear housings are provided with two sets of upper assembly holes on the upper part and two sets of lower assembly holes on the bottom of the front and rear housings. The front and rear housings are fixedly connected by assembly bolts located in each set of assembly holes.

[0007] Preferably, a front clamping half-sleeve extending outward is provided on both sides of the middle part of the front housing, and a rear clamping half-sleeve extending outward is provided on both sides of the middle part of the rear housing. The left part of the measuring pipe is clamped between the front clamping half-sleeve and the rear clamping half-sleeve on the left side, and the right part of the measuring pipe is clamped between the front clamping half-sleeve and the rear clamping half-sleeve on the right side.

[0008] Preferably, a semi-annular positioning groove is provided on the inner wall of both the front clamping half and the rear clamping half, and two integrally formed left and right positioning rings are provided at corresponding positions on the outer wall of the measuring pipe. The left positioning ring is located in the positioning groove of the left front clamping half and the rear clamping half, and the right positioning ring is located in the positioning groove of the right front clamping half and the rear clamping half.

[0009] Preferably, the front housing, the front clamping half-sleeve, and the front flange plate are integrally injection molded, and the coil bracket is bonded and fixed inside the front housing; the rear housing, the rear clamping half-sleeve, and the rear flange plate are integrally injection molded, and the coil bracket is bonded and fixed inside the rear housing.

[0010] Preferably, a magnetic shielding block is provided on the coil support and outside the excitation coil.

[0011] The advantages and positive effects of this utility model are:

[0012] This invention provides a corrosion-resistant electromagnetic flowmeter. Compared to existing electromagnetic flowmeters that use bushings inside the measuring pipe, the measuring pipe of this invention is made of engineering plastic, thus offering superior corrosion resistance and making it suitable for measuring the flow of corrosive liquids such as acidic and alkaline liquids. The measuring electrodes are directly mounted on the top and bottom walls of the measuring pipe, ensuring accurate relative positioning and improving flow measurement accuracy. The electromagnetic flowmeter uses two excitation coils to generate a uniform and regular magnetic field, mounted on coil supports inside the front and rear housings respectively. When the front and rear housings clamp and fix the measuring pipe in the middle, the two excitation coils engage with the middle of the measuring pipe, improving the positional accuracy between the excitation coils and the measuring pipe, further enhancing flow measurement accuracy. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0014] Figure 2 This is a side view of the main body of the present invention.

[0015] Figure 3 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 4 yes Figure 1 A schematic diagram of the main structure of the measuring pipe and its auxiliary components.

[0017] In the picture:

[0018] 1. Left flange; 2. Rear housing; 3. Rear flange plate; 4. Meter head support; 5. Meter head; 6. Front clamping half-set; 7. Front housing; 8. Right flange; 9. Front flange plate; 10. Display screen; 11. Rear clamping half-set; 12. Excitation coil; 13. Magnetic shielding block; 14. Coil bracket; 15. Positioning groove; 16. Measuring pipe; 17. Positioning ring; 18. Assembly bolts; 19. Measuring electrode. Detailed Implementation

[0019] To further understand the invention content, features and effects of this utility model, the following embodiments are provided in detail.

[0020] Please see Figure 1 and Figure 4 The corrosion-resistant electromagnetic flowmeter of this utility model includes a measuring pipe 16 with a left flange 1 and a right flange 8 at both ends. All three are made of engineering plastic and are integrally injection molded. Two longitudinally facing measuring electrodes 19 are provided in the middle of the top wall and the middle of the bottom wall of the measuring pipe 16. The two measuring electrodes 19 can be integrally injection molded on the top and bottom walls of the measuring pipe 16 during the injection molding of the left flange 1, the right flange 8 and the measuring pipe 16, thus ensuring the relative positional accuracy between the two measuring electrodes 19.

[0021] It also includes a front housing 7 and a rear housing 2 that clamp the measuring pipe 16 in the middle, with the measuring pipe 16 passing through the middle of the front housing 7 and the rear housing 2.

[0022] Please see Figure 2 and Figure 3 It can be seen that:

[0023] Both the front housing 7 and the rear housing 2 are equipped with coil supports 14, and excitation coils 12 are mounted on the coil supports 14. The two excitation coils 12 are located in front of the middle and behind the middle of the measuring pipe 16, respectively. The two excitation coils 12 are used to form a uniform and regular magnetic field inside the measuring pipe 16. The direction of the magnetic field is perpendicular to the axial direction of the measuring pipe 16. The liquid in the measuring pipe 16 flows along the axial direction of the pipe and passes through the aforementioned magnetic field. The induced electromotive force generated is detected by the upper and lower measuring electrodes 19. The flow rate of the liquid inside is calculated based on the magnitude of the induced electromotive force.

[0024] In this embodiment, a magnetic shielding block 13 is provided on the coil support 14, outside the excitation coil 12. The function of the magnetic shielding block 13 is to reduce the interference of the magnetic field in the external environment on the excitation coil 12 and ensure the uniformity and regularity of the internal magnetic field. Since the two excitation coils 12 of this electromagnetic flowmeter are located outside the measuring pipe 16, it is an external magnetic electromagnetic flowmeter.

[0025] A front half flange plate 9 is provided on the top of the front housing 7, and a rear half flange plate 3 is provided on the top of the rear housing 2. When the front housing 7 and the rear housing 2 are assembled together, the front half flange plate 9 and the rear half flange plate form a top flange. It also includes a meter head 5 with a display screen 10 at the front and a meter head support 4 at the bottom. The bottom of the meter head support 4 is fixedly connected to the top flange. Specifically, the bottom of the meter head support 4 has a connecting flange, which is fixedly connected to the top flange with bolts.

[0026] In this embodiment, outwardly extending front clamping half-sleeves 6 are provided on both sides of the middle portion of the front housing 7, and outwardly extending rear clamping half-sleeves 11 are provided on both sides of the middle portion of the rear housing 2. The left part of the measuring pipe 16 is clamped between the left front clamping half-sleeve 6 and the rear clamping half-sleeve 11, and the right part of the measuring pipe 16 is clamped between the right front clamping half-sleeve 6 and the rear clamping half-sleeve 11. By clamping the measuring pipe 16 between the front clamping half-sleeve 6 and the rear clamping half-sleeve 11, the stability and stability of the measuring pipe 16 when clamped and fixed by both the front housing 7 and the rear housing 2 are improved.

[0027] In this embodiment, semi-annular positioning grooves 15 are provided on the inner walls of both the front clamping half-sleeve 6 and the rear clamping half-sleeve 11. Two integrally formed left and right positioning rings 17 are provided at corresponding positions on the outer wall of the measuring pipe 16. The left positioning ring 17 is located within the positioning groove 15 of the left front clamping half-sleeve 6 and the rear clamping half-sleeve 11, and the right positioning ring 17 is located within the positioning groove 15 of the right front clamping half-sleeve 6 and the rear clamping half-sleeve 11. By setting the two positioning rings 17 and the two positioning grooves 15, axial positioning is achieved when the front housing 7 and the rear housing 2 are assembled with the measuring pipe 16. Since the positioning rings 17 fall within the positioning grooves 15, no relative axial displacement occurs between the measuring pipe 16 and the front housing 7 and the rear housing 2.

[0028] In this embodiment, the front housing 7, the front clamping half-sleeve 6, and the front flange plate 9 are integrally injection molded, and their coil bracket 14 is bonded and fixed inside the front housing 7; the rear housing 2, the rear clamping half-sleeve 11, and the rear flange plate 3 are integrally injection molded, and their coil bracket 14 is bonded and fixed inside the rear housing 2.

[0029] In this embodiment, two sets of upper assembly holes are provided on the upper part of the front housing 7 and the rear housing 2, and two sets of lower assembly holes are provided on the bottom of the front housing 7 and the rear housing 2. The front housing 7 and the rear housing 2 are fixedly connected by assembly bolts 18 located in each set of assembly holes.

[0030] Assembly method:

[0031] The middle part of the measuring pipe 16 is inserted into the front clamping half 6 of the front housing 7 and the rear clamping half 11 of the rear housing 2. The positioning ring 17 on the left falls into the positioning groove 15 on the left and the positioning ring 17 on the right falls into the positioning groove 15 on the right. Assembly bolts 18 are installed in the upper assembly holes on the left and right and the lower assembly holes on the left and right. The assembly bolts 18 are tightened to combine the front housing 7, the rear housing 2 and the measuring pipe 16 into one unit. The wire harnesses of the upper and lower measuring electrodes 19 and the wire harnesses of the front and rear excitation coils 12 are extended upward and passed through the meter head support 4 and connected to the meter head 5. The connecting flange at the bottom of the meter head support 4 is fixedly connected to the top flange formed by the front half flange plate 9 and the rear half flange plate 3 with multiple bolts.

Claims

1. A corrosion-resistant electromagnetic flowmeter, characterized in that: The system includes a measuring pipe (16) with a left flange (1) and a right flange (8) at each end. All three components are made of engineering plastic and are integrally injection molded. Two longitudinally aligned measuring electrodes (19) are provided in the middle of the top and bottom walls of the measuring pipe (16). The system also includes a front housing (7) and a rear housing (2) that clamp the measuring pipe (16) in the middle. Both the front housing (7) and the rear housing (2) have coil supports (14) inside, and excitation coils (1) are installed on the coil supports (14). 2) Two excitation coils (12) are located in front of the middle and behind the middle of the measuring pipe (16), respectively; a front half flange plate (9) is provided on the top of the front housing (7), and a rear half flange plate (3) is provided on the top of the rear housing (2). When the front housing (7) and the rear housing (2) are assembled together, the front half flange plate (9) and the rear half flange plate (3) form the top flange. It also includes a meter head (5) with a display screen (10) at the front and a meter head support (4) at the bottom. The bottom of the meter head support (4) is fixedly connected to the top flange.

2. The corrosion-resistant electromagnetic flowmeter as described in claim 1, characterized in that: The front housing (7) and the rear housing (2) are provided with two sets of upper assembly holes on the left and right sides, and the front housing (7) and the rear housing (2) are provided with two sets of lower assembly holes on the left and right sides at the bottom. The front housing (7) and the rear housing (2) are fixedly connected by assembly bolts (18) located in each set of assembly holes.

3. The corrosion-resistant electromagnetic flowmeter as described in claim 2, characterized in that: The front housing (7) has outwardly extending front clamping half sleeves (6) on both sides of the middle part, and the rear housing (2) has outwardly extending rear clamping half sleeves (11) on both sides of the middle part. The left part of the measuring pipe (16) is clamped between the left front clamping half sleeve (6) and the rear clamping half sleeve (11), and the right part of the measuring pipe (16) is clamped between the right front clamping half sleeve (6) and the rear clamping half sleeve (11).

4. The corrosion-resistant electromagnetic flowmeter as described in claim 3, characterized in that: A semi-circular positioning groove (15) is provided on the inner wall of both the front clamping half-sleeve (6) and the rear clamping half-sleeve (11). Two integrally formed positioning rings (17) are provided at corresponding positions on the outer wall of the measuring pipe (16). The positioning ring (17) on the left is located in the positioning groove (15) of the front clamping half-sleeve (6) and the rear clamping half-sleeve (11) on the left, and the positioning ring (17) on the right is located in the positioning groove (15) of the front clamping half-sleeve (6) and the rear clamping half-sleeve (11) on the right.

5. The corrosion-resistant electromagnetic flowmeter as described in claim 4, characterized in that: The front housing (7), the front clamping half (6) and the front flange plate (9) are integrally injection molded, and the coil bracket (14) is bonded and fixed inside the front housing (7); the rear housing (2), the rear clamping half (11) and the rear flange plate (3) are integrally injection molded, and the coil bracket (14) is bonded and fixed inside the rear housing (2).

6. The corrosion-resistant electromagnetic flowmeter as described in claim 5, characterized in that: A magnetic shielding block (13) is provided on the coil support (14) and on the outside of the excitation coil (12).

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