Electromagnetic flowmeter capable of preventing dirt deposition
By adopting an inclined cavity structure and inclined setting of ground electrodes in the electromagnetic flowmeter, and using high-speed water flow to erode the surface of the ground electrode, the problem of dirt deposited by the ground electrode is solved, and the stable measurement of the flowmeter is achieved.
Patent Information
- Application Number
- CN202421894310.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-06
AI Technical Summary
In environments with poor water quality and a lot of impurities, dirt and sand are prone to deposit on the surface of the grounding electrode, resulting in the flowmeter being unable to be properly grounded.
An electromagnetic flowmeter is designed to prevent dirt deposition, an inclined cavity structure is adopted where the flow chamber wall of the measuring tube is recessed radially outward, and a first ground electrode is arranged on the cavity wall of the inclined cavity, and a high-speed water flow is used to erode the ground electrode surface to prevent dirt deposition.
It effectively prevents the deposition of dirt and sludge on the ground electrode, ensures the normal and effective grounding of the flowmeter, and improves the reliability and stability of measurement.
Smart Images
Figure CN223064659U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fluid metering, in particular to an electromagnetic flowmeter for preventing dirt deposition. Background Art
[0002] An electromagnetic flowmeter is a measuring device that measures information such as fluid flow rate and flow velocity according to Faraday's law of electromagnetic induction. During the measurement process, signal electrodes and grounding electrodes play a core role. The signal electrodes are mainly responsible for measuring the induced electromotive force, signal conversion, and forming a current loop, etc. The grounding electrode can effectively release possible electrical interference or static electricity to the ground, avoiding adverse effects on the flowmeter or the measurement process.
[0003] The measuring tube of the existing electromagnetic flowmeter is usually a straight tube, adopting a four-electrode structure with a horizontal and vertical layout, that is, two signal electrodes are installed horizontally, and two grounding electrodes are installed vertically. When this structure of electromagnetic flowmeter is used in a fluid environment with poor water quality and a large amount of impurities, dirt and sediment and other substances are likely to deposit on the surface of the grounding electrode installed below, resulting in the surface of the grounding electrode being covered, thus causing the flowmeter to be unable to be grounded normally and effectively.
[0004] Therefore, it is urgent to propose an electromagnetic flowmeter for preventing dirt deposition to solve the above problems. Summary of the Utility Model
[0005] The purpose of the utility model is to at least solve the problem that dirt and sediment and other substances are likely to deposit on the surface of the grounding electrode. This purpose is achieved through the following technical solutions:
[0006] The first aspect of the utility model proposes an electromagnetic flowmeter for preventing dirt deposition, including:
[0007] A measuring tube, the measuring tube has a flow cavity, the flow cavity includes an inclined cavity with part of the cavity wall recessed radially outward, and the inclined cavity extends along the axial direction of the measuring tube;
[0008] A first grounding electrode, the first grounding electrode is located on the cavity wall of the inclined cavity;
[0009] A signal electrode, the signal electrode is arranged on the measuring tube.
[0010] In the electromagnetic flowmeter for preventing dirt deposition in this technical solution, when the fluid flows through the measuring tube, the fluid velocity changes according to the structure of the cavity. By arranging the first grounding electrode on the cavity wall of the inclined cavity, that is, the first grounding electrode is located on the inclined surface, the surface of the first grounding electrode can be washed by the high-speed water flow. Therefore, dirt in the fluid is not likely to deposit on the first grounding electrode.
[0011] In addition, the electromagnetic flowmeter for preventing dirt deposition according to the present utility model may further have the following additional technical features:
[0012] In some embodiments of the present utility model, from the water inlet end to the water outlet end of the measuring tube, the cavity wall of the inclined cavity is gradually inclined inward along the radial direction, so that the size of the cavity wall of the inclined cavity gradually decreases along the radial direction.
[0013] In some embodiments of the present utility model, the cross-section of the cavity wall of the inclined cavity perpendicular to the flow direction is zigzag.
[0014] In some embodiments of the present utility model, the cross-section of the cavity wall of the inclined cavity perpendicular to the flow direction is arc-shaped.
[0015] In some embodiments of the present utility model, a first through hole is provided on the cavity wall of the inclined cavity, the first grounding electrode is connected to the first through hole, a first connecting component is hermetically connected to the bottom of the first grounding electrode, and the first grounding electrode is hermetically connected to the measuring tube through the first connecting component.
[0016] In some embodiments of the present utility model, the first connecting component includes a first fixing sleeve, a first sealing ring and a first positioning washer. The first fixing sleeve, the first sealing ring and the first positioning washer are sleeved on the first grounding electrode. The first fixing sleeve is hermetically connected to the first through hole. The first sealing ring is located inside the first fixing sleeve. The top of the first positioning washer is inserted into the first fixing sleeve and abuts against the first sealing ring.
[0017] In some embodiments of the present utility model, the first positioning washer includes a connecting section and an extending section connected to each other. The outer diameter of the connecting section is smaller than that of the extending section. The connecting section passes through the first fixing sleeve, and the extending section abuts against the first fixing sleeve.
[0018] In some embodiments of the present utility model, the first connecting component includes a first buffer member and a first connecting member. The first buffer member and the first connecting member are sleeved on the first grounding electrode. The first buffer member is located between the first positioning washer and the first connecting member.
[0019] In some embodiments of the present utility model, the first buffer member includes a first upper fixing sleeve, a first spring and a first lower fixing sleeve. The top of the first upper fixing sleeve abuts against the first positioning washer. The bottom of the first lower fixing sleeve abuts against the first connecting member. The two ends of the first spring respectively abut against the first upper fixing sleeve and the first lower fixing sleeve.
[0020] In some embodiments of the present utility model, the electromagnetic flowmeter for preventing dirt deposition includes a second grounding electrode, the second grounding electrode is connected to the measuring tube, and the edge of the electrode end face of the second grounding electrode is flush with the wall of the flow-through cavity. Description of the Drawings
[0021] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:
[0022] Figure 1 is a cross-sectional schematic view of the electromagnetic flowmeter for preventing dirt deposition provided by the present utility model from a certain perspective;
[0023] Figure 2 is a cross-sectional schematic view of the electromagnetic flowmeter for preventing dirt deposition provided by the present utility model from another perspective;
[0024] Figure 3 is a partial structural schematic view of a housing tube provided by the present utility model;
[0025] Figure 4 is a partial structural schematic view of another housing tube provided by the present utility model;
[0026] Figure 5 is a partial structural schematic view of yet another housing tube provided by the present utility model;
[0027] Figure 6 is Figure 2 a partial enlarged view of part A in
[0028] Figure 7 is Figure 2 a partial enlarged view of part B in
[0029] In the figures:
[0030] 100, measuring tube; 110, lining tube; 111, flow-through cavity; 112, inclined cavity; 120, housing tube; 130, flange;
[0031] 200, first grounding electrode; 210, first connection assembly; 211, first fixing sleeve; 212, first sealing ring; 213, first positioning washer; 214, first upper fixing sleeve; 215, first spring; 216, first lower fixing sleeve; 217, first connecting piece;
[0032] 300. Second grounding electrode; 310. Second connection assembly; 311. Second fixing sleeve; 312. Second sealing ring; 313. Second positioning washer; 314. Second upper fixing sleeve; 315. Second spring; 316. Second lower fixing sleeve; 317. Second connecting member;
[0033] 400. Excitation assembly; 410. Signal electrode; 420. Excitation coil; 430. Silicon steel sheet; 440. Iron core;
[0034] 500. Sealing assembly; 510. Side plate; 520. Cover plate. Detailed implementation manners
[0035] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.
[0036] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" as used herein may also include the plural forms. The terms "include", "comprise", "contain" and "have" are inclusive and thus specify the presence of the stated features, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the execution order is explicitly stated. It should also be understood that additional or alternative steps may be used.
[0037] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms used herein do not imply an order or sequence. Thus, the first element, component, region, layer or section discussed below may be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0038] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over" and the like. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientations depicted in the figure. For example, if the device in the figure is flipped, an element described as "below" or "beneath" another element or feature will then be oriented as "above" or "over" the other element or feature. Thus, the example term "below" can include both upward and downward orientations. The device may be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.
[0039] See Figure 1 and Figure 2 This embodiment provides an electromagnetic flowmeter for preventing dirt deposition, which includes a measuring tube 100, a first grounding electrode 200 and a signal electrode 410. The measuring tube 100 has a flow cavity 111, and the flow cavity 111 includes an inclined cavity 112 in which a part of the cavity wall is recessed radially outward. The inclined cavity 112 extends along the axial direction of the measuring tube 100; the first grounding electrode 200 is located on the cavity wall of the inclined cavity 112; the signal electrode 410 is disposed on the measuring tube 100.
[0040] When the fluid flows through the measuring tube 100 in the above-mentioned electromagnetic flowmeter for preventing dirt deposition, the fluid velocity changes according to the structure of the cavity. By disposing the first grounding electrode 200 on the cavity wall of the inclined cavity 112, that is, the first grounding electrode 200 is located on an inclined surface, the surface of the first grounding electrode 200 can be washed by high-speed water flow. Therefore, dirt in the fluid is not easily deposited on the first grounding electrode 200.
[0041] Optionally, from the water inlet end to the water outlet end of the measuring tube 100, the cavity wall of the inclined cavity 112 is inclined gradually inward in the radial direction, so that the radial dimension of the cavity wall of the inclined cavity 112 gradually decreases. Optionally, the first grounding electrode 200 is installed at one end with a relatively large water flow velocity in the inclined cavity 112, that is, the first grounding electrode 200 is installed at one end with a relatively small radial dimension of the inclined cavity 112, so that the scouring effect of the water flow can be fully utilized.
[0042] Further, the measuring tube 100 includes a lining tube 110 and an outer shell tube 120. A circulation cavity 111 is formed inside the lining tube 110, and the outer shell tube 120 is sleeved outside the lining tube 110. Optionally, the outer shell tube 120 is made of stainless steel tubing. Since the fluid to be measured is a conductive liquid, to ensure the correctness of the measurement structure and the normal operation and service life of the components in the circuit, reliable insulation treatment must be carried out between the outer shell tube 120 and the fluid to be measured. Therefore, the lining tube 110 can be made of rubber or tetrafluoroethylene and other plastic materials that can insulate the fluid from the outer shell tube 120.
[0043] Optionally, a flange 130 is provided at each end of the outer shell tube 120, and the two ends of the outer shell tube 120 and the inner ring of the flange 130 can be fixedly connected by welding. Optionally, a sealing assembly 500 is provided between the two flanges 130. The sealing assembly 500 includes two side plates 510 arranged at intervals, and the outer peripheries of the two side plates 510 are hermetically connected by a cover plate 520. A ring-shaped cavity is formed by the two side plates 510, the cover plate 520, and the outer wall of the outer shell tube 120. One end of the first grounding electrode 200 extending out of the measuring tube 100 is located inside the cavity.
[0044] Further, an exciting assembly 400 is provided on the measuring tube 100. The exciting assembly 400 includes an exciting coil 420, silicon steel sheets 430, an iron core 440, and the above-mentioned signal electrode 410. Optionally, the edge of the electrode end face of the signal electrode 410 is flush with the side wall of the circulation cavity 111, so as to avoid the signal electrode 410 affecting the flow rate of the fluid in the circulation cavity 111. Optionally, the number of signal electrodes 410 is two, and the two signal electrodes 410 are symmetrically arranged with respect to the vertical plane of the measuring tube 100. Optionally, the exciting coil 420 and the iron core 440 are symmetrically installed on the outer periphery of the middle position of the outer shell tube 120, and the silicon steel sheets 430 are coated outside the exciting coil 420 to form a closed magnetic circuit. The assembly and connection method of the exciting assembly 400 is a mature prior art in the field and will not be described in detail here.
[0045] See Figure 3 and Figure 4 , in some embodiments, the cross-section of the cavity wall of the inclined cavity 112 in the direction perpendicular to the flow direction is polygonal. For example, the polygon is formed by sequentially connecting three side lengths (as shown in Figure 3 ), or the polygon is formed by connecting two side lengths (as shown in Figure 2 ). Of course, the number of side lengths of the polygon can also be four, five, six, etc. See Figure 5 , in other embodiments, the cross-section of the cavity wall of the inclined cavity 112 in the direction perpendicular to the flow direction is arc-shaped.
[0046] Further, a first through hole is provided on the cavity wall of the inclined cavity 112. The first grounding electrode 200 is connected to the first through hole. A first connection assembly 210 is hermetically connected to the bottom of the first grounding electrode 200. The first grounding electrode 200 is hermetically connected to the measuring tube 100 through the first connection assembly 210. Optionally, the first through hole is a stepped hole, the first grounding electrode 200 is T-shaped, the bottom of the first grounding electrode 200 extends from the inside of the inner lining tube 110 to the outside, and the top of the first grounding electrode 200 overlaps in the first through hole. Further, the edge of the electrode end face of the first grounding electrode 200 is flush with the bottom of the cavity wall, so as to avoid the influence of the first grounding electrode 200 on the flow velocity of the fluid in the measuring tube 100. At the same time, it avoids the generation of dead corners where dirt or sediment is likely to accumulate between the first grounding electrode 200 and the cavity wall of the inclined cavity 112.
[0047] Further, referring to Figure 6 , the first connection assembly 210 includes a first fixing sleeve 211, a first sealing ring 212 and a first positioning washer 213. The first fixing sleeve 211, the first sealing ring 212 and the first positioning washer 213 are sleeved on the first grounding electrode 200. The first fixing sleeve 211 is hermetically connected to the first through hole. The first sealing ring 212 is located inside the first fixing sleeve 211. The top of the first positioning washer 213 is inserted into the first fixing sleeve 211 and abuts against the first sealing ring 212. The first connection assembly 210 fixes the first grounding electrode 200 and the measuring tube 100 from the outside of the outer shell tube 120, avoiding relative movement between the first grounding electrode 200 and the measuring tube 100. It can be understood that the inner diameter of the first fixing sleeve 211 is larger than the outer diameter of the first grounding electrode 200. By providing the first sealing ring 212 between the inner side of the first fixing sleeve 211 and the outer side of the first grounding electrode 200, it is possible to prevent the fluid in the inner lining tube 110 from flowing out through the first through hole. The first positioning washer 213 plays a role in supporting and fixing the first sealing ring 212, preventing the first sealing ring 212 from moving inside the first fixing sleeve 211. Optionally, the material of the first sealing ring 212 can be polytetrafluoroethylene, and the materials of the first fixing sleeve 211 and the first positioning washer 213 can be metal.
[0048] Optionally, the first through hole is provided with internal threads, and the first fixing sleeve 211 is provided with external threads. The first fixing sleeve 211 and the first through hole are threadedly connected. The threaded connection method is convenient and has high sealing performance. Optionally, the first fixing sleeve 211 includes a first section and a second section connected to each other. The outer diameter of the first section is smaller than the outer diameter of the second section. The first section is inserted into the first through hole, and the second section abuts against the outer wall of the measuring tube 100. It can be understood that the second section plays a positioning role in the assembly process of the first fixing sleeve 211 and the measuring tube 100, ensuring that the first fixing sleeve 211 is installed in place.
[0049] Further, the first positioning washer 213 includes a connecting section and an extending section that are connected to each other. The outer diameter of the connecting section is smaller than that of the extending section. The connecting section is inserted through the first fixing sleeve 211, and the extending section abuts against the first fixing sleeve 211. Understandably, the extending section plays a positioning role in the connection between the first fixing sleeve 211 and the measuring tube 100, ensuring that the first fixing sleeve 211 is installed in place.
[0050] Further, the first connecting assembly 210 includes a first buffer member and a first connecting member 217. The first buffer member and the first connecting member 217 are sleeved on the first grounding electrode 200, and the first buffer member is located between the first positioning washer 213 and the first connecting member 217. By providing the first buffer member between the first positioning washer 213 and the first connecting member 217, it is possible to prevent the first positioning washer 213 from being crushed.
[0051] Further, the first buffer member includes a first upper fixing sleeve 214, a first spring 215, and a first lower fixing sleeve 216. The top of the first upper fixing sleeve 214 abuts against the first positioning washer 213, the bottom of the first lower fixing sleeve 216 abuts against the first connecting member 217, and both ends of the first spring 215 abut against the first upper fixing sleeve 214 and the first lower fixing sleeve 216 respectively. Optionally, both the first upper fixing sleeve 214 and the first lower fixing sleeve 216 are cylindrical, and a columnar cavity is formed between the first upper fixing sleeve 214 and the first lower fixing sleeve 216, and the first spring 215 is located in the cavity. The first upper fixing sleeve 214 and the first lower fixing sleeve 216 can provide effective protection for the first spring 215. The first connecting member 217 plays a fastening role for the first buffer member, ensuring that the first grounding electrode 200 can be stably and firmly connected to the first through hole.
[0052] Further, the first connecting member 217 is a nut, and the first connecting member 217 is threadedly connected to the first grounding electrode 200. Using a nut to fix other components on the first grounding electrode 200 is convenient for connection and detachable, facilitating subsequent maintenance work.
[0053] See Figure 7 , the electromagnetic flowmeter for preventing dirt deposition includes a second grounding electrode 300. The second grounding electrode 300 is connected to the measuring tube 100, and the edge of the electrode end face of the second grounding electrode 300 is flush with the wall of the flow cavity 111. By adding a grounding electrode in the flow cavity 111, it is possible to ensure more stable wiring. Optionally, the second grounding electrode 300 is provided at the top of the flow cavity 111, which can avoid the deposition of dirt or sediment. The edge of the electrode end face of the second grounding electrode 300 being flush with the wall of the flow cavity 111 can avoid affecting the flow rate of the fluid by the second grounding electrode 300.
[0054] Optionally, the cavity wall of the flow cavity 111 is provided with a second through hole, and the second grounding electrode 300 is inserted through the second through hole. A second connection assembly 310 is hermetically sleeved at the bottom of the second grounding electrode 300, and the second connection assembly 310 is hermetically connected to the measuring tube 100. In some embodiments, the second connection assembly 310 has the same structure as the first connection assembly 210. In other embodiments, the second connection assembly 310 may also have a different structure from the first connection assembly 210. Exemplarily, the second connection assembly 310 includes a second fixing sleeve 311 sleeved on the second grounding electrode 300, a second sealing ring 312, and a second positioning washer 313. The second fixing sleeve 311 is hermetically connected to the second through hole. The second sealing ring 312 is located inside the second fixing sleeve 311. The top of the second positioning washer 313 is inserted into the second fixing sleeve 311 and abuts against the second sealing ring 312. The second connection assembly 310 includes a second buffer member and a second connecting member 317 sleeved on the second grounding electrode 300. The second buffer member is located between the second positioning washer 313 and the second connecting member 317. The second buffer member includes a second upper fixing sleeve 314, a second spring 315, and a second lower fixing sleeve 316 sleeved on the second grounding electrode 300. The top of the second upper fixing sleeve 314 abuts against the second positioning washer 313. The bottom of the second lower fixing sleeve 316 abuts against the second connecting member 317. The two ends of the second spring 315 respectively abut against the second upper fixing sleeve 314 and the second lower fixing sleeve 316. Optionally, the second connecting member 317 is a nut, and the second connecting member 317 is threadedly connected to the second grounding electrode 300.
[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. An electromagnetic flowmeter for preventing dirt deposition, characterized in that, Comprising: A measuring tube (100), the measuring tube (100) having a flow-through cavity (111), the flow-through cavity (111) including an inclined cavity (112) with a part of the cavity wall recessed radially outward, the inclined cavity (112) extending along the axial direction of the measuring tube (100); A first grounding electrode (200), the first grounding electrode (200) being located on the cavity wall of the inclined cavity (112); A signal electrode (410), the signal electrode (410) being disposed on the measuring tube (100).
2. The electromagnetic flowmeter for preventing dirt deposition according to claim 1, characterized in that, From the water inlet end to the water outlet end of the measuring tube (100), the cavity wall of the inclined cavity (112) is gradually inclined inward radially, so that the radial dimension of the cavity wall of the inclined cavity (112) gradually decreases.
3. The electromagnetic flowmeter for preventing dirt deposition according to claim 1, wherein The cross-section of the cavity wall of the inclined cavity (112) in a direction perpendicular to the flow direction is zigzag.
4. The electromagnetic flowmeter for preventing dirt deposition according to claim 1, wherein The cross-section of the cavity wall of the inclined cavity (112) in a direction perpendicular to the flow direction is arc-shaped.
5. The electromagnetic flowmeter for preventing dirt deposition according to claim 1, wherein A first through hole is provided on the cavity wall of the inclined cavity (112), the first grounding electrode (200) is connected to the first through hole, a first connection assembly (210) is hermetically connected to the bottom of the first grounding electrode (200), and the first grounding electrode (200) is hermetically connected to the measuring tube (100) through the first connection assembly (210).
6. The electromagnetic flowmeter for preventing dirt deposition according to claim 5, characterized in that, The first connection assembly (210) includes a first fixing sleeve (211), a first sealing ring (212) and a first positioning washer (213), the first fixing sleeve (211), the first sealing ring (212) and the first positioning washer (213) are sleeved on the first grounding electrode (200), the first fixing sleeve (211) is hermetically connected to the first through hole, the first sealing ring (212) is located inside the first fixing sleeve (211), and the top of the first positioning washer (213) is inserted into the first fixing sleeve (211) and abuts against the first sealing ring (212).
7. The electromagnetic flowmeter for preventing dirt deposition according to claim 6, characterized in that, The first positioning washer (213) includes a connecting section and an extending section connected to each other, the outer diameter of the connecting section is smaller than the outer diameter of the extending section, the connecting section passes through the first fixing sleeve (211), and the extending section abuts against the first fixing sleeve (211).
8. The electromagnetic flowmeter for preventing dirt deposition according to claim 6, characterized in that, The first connection assembly (210) includes a first buffer member and a first connecting member (217), the first buffer member and the first connecting member (217) are sleeved on the first grounding electrode (200), and the first buffer member is located between the first positioning washer (213) and the first connecting member (217).
9. The electromagnetic flowmeter for preventing dirt deposition according to claim 8, characterized in that, The first buffer member includes a first upper fixing sleeve (214), a first spring (215) and a first lower fixing sleeve (216), the top of the first upper fixing sleeve (214) abuts against the first positioning washer (213), the bottom of the first lower fixing sleeve (216) abuts against the first connecting member (217), and both ends of the first spring (215) abut against the first upper fixing sleeve (214) and the first lower fixing sleeve (216) respectively.
10. The electromagnetic flowmeter for preventing dirt deposition according to claim 1, characterized in that, The electromagnetic flowmeter for preventing dirt deposition includes a second grounding electrode (300), the second grounding electrode (300) is connected to the measuring tube (100), and the edge of the electrode end face of the second grounding electrode (300) is flush with the wall of the flow-through cavity (111).