Electromagnetic flowmeter
By changing the bushing structure and ground electrode position of the electromagnetic flowmeter, the problem of ground electrode dirt deposition is solved, and the normal operation and high-precision measurement of the electromagnetic flowmeter are achieved.
Patent Information
- Application Number
- CN202421901968.7
- 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 fluid environments with poor water quality and many impurities, the grounding electrode of the electromagnetic flowmeter is prone to deposit dirt or sludge, which affects the measurement accuracy and normal operation of the equipment.
By changing the bushing structure of the measuring tube, the water flow speed is increased, and the ground electrode is set at the bottom of the water inlet cavity. The water flow is used to erode the dirt to prevent it from deposition. At the same time, sealing connections are used to ensure the sealing of the measuring tube and the signal acquisition effect.
It effectively avoids the deposition of dirt or silt on the surface of the grounding electrode, ensures the normal operation and measurement accuracy of the electromagnetic flowmeter, and improves the magnetic induction strength and signal acquisition effect.
Smart Images
Figure CN223064667U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electromagnetic water meters, and particularly relates to an electromagnetic flowmeter. Background Art
[0002] When measuring the flow rate of incompressible conductive fluid in a closed pipeline, an electromagnetic flowmeter is often required. The electromagnetic flowmeter applies the principle of electromagnetic induction and measures the volume flow rate of the conductive liquid according to the electromotive force induced when the conductive fluid passes through an externally applied magnetic field. The electromagnetic flowmeter in it converts the volume flow rate information of the fluid into an electrical signal. After being processed by the conversion circuit of the electromagnetic flowmeter, the flow signal is output in the form of an analog or digital signal. The electrode is one of the core components of the electromagnetic flowmeter. The measuring electrode does not need to be in contact with the fluid, and its function is to receive the electromagnetic flow signal. The grounding electrode is connected to the ground wire. The grounding electrode needs to be in contact with the fluid during operation to eliminate external interference signals generated during the measurement process and ensure the safe operation of the electromagnetic flowmeter.
[0003] In a fluid environment with poor water quality and many impurities, dirt, sediment and other substances are likely to deposit on the surface of the grounding electrode installed at the bottom of the electromagnetic flowmeter. After the surface of the grounding electrode is contaminated, it cannot be in contact with the fluid, and the zero potential of the fluid cannot be guaranteed, thus affecting the normal operation of the battery flowmeter. If the grounding electrode is installed at the top of the electromagnetic flowmeter, when the fluid in the measuring tube is less, it may cause the fluid to be unable to contact the grounding electrode, so that the grounding electrode cannot play its role.
[0004] Therefore, it is urgent to propose an electromagnetic flowmeter 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, sediment and other substances are likely to deposit on the surface of the electrode. This purpose is achieved by the following technical solutions:
[0006] The first aspect of the utility model proposes an electromagnetic flowmeter, including:
[0007] A measuring tube, the measuring tube has a water inlet cavity, the water inlet cavity has a first end and a second end, the inner diameter of the water inlet cavity gradually decreases from the second end to the first end, and the side wall of the first end of the water inlet cavity is an inclined surface, and a first through hole is provided at the bottom of the side wall of the first end of the water inlet cavity;
[0008] A first grounding electrode, the first grounding electrode is connected to the first through hole, and the edge of the electrode end face of the first grounding electrode is flush with the inner wall of the water inlet cavity;
[0009] A first connection assembly, the first connection assembly is hermetically connected to the bottom of the first grounding electrode, and the first connection assembly is hermetically connected to the measuring tube.
[0010] In the electromagnetic flowmeter of this technical solution, the water flow velocity changes due to the change of the bushing structure. Since the inner diameter of the water inlet cavity gradually decreases from the second end to the first end, the water flow velocity gradually increases after the water enters the water inlet cavity. At the same time, the side wall of the first end of the water inlet cavity forms an inclined surface, and the first grounding electrode is located on the inclined surface. The water flow after the velocity increases can wash the surface of the first grounding electrode 200, and the dirt washed down is easily carried away by the water flow. Therefore, the dirt in the fluid is not easily deposited on the first grounding electrode, effectively avoiding the influence of its function by dirt or sediment. By arranging the first grounding electrode at the bottom of the water inlet cavity, the situation that the first grounding electrode cannot be contacted when the water flow in the pipe is not full can be prevented. The edge of the electrode end face of the first grounding electrode is flush with the inner wall of the water inlet cavity, so that the flow velocity of the fluid in the water inlet cavity can be avoided from being affected by the first grounding electrode, and at the same time, the dead angle where dirt or sediment is likely to accumulate between the first grounding electrode and the side wall of the water inlet cavity is avoided. The first grounding electrode and the measuring pipe are hermetically connected by using the first connection assembly to prevent the fluid from flowing out from the first through hole and ensure the tightness of the measuring pipe. When the water flow passes through the communication cavity, due to the increase in the flow velocity, it is more conducive to the acquisition of sensor signals, and the reduction of the magnetic circuit gap in the communication cavity is conducive to improving the magnetic induction intensity.
[0011] In addition, the electromagnetic flowmeter according to the present invention may further have the following additional technical features:
[0012] In some embodiments of the present invention, the first connection assembly includes a first fixing sleeve, a first sealing ring and a first positioning washer 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.
[0013] In some embodiments of the present invention, the first fixing sleeve 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 through hole, and the extending section abuts against the measuring pipe.
[0014] In some embodiments of the present invention, the first connection assembly includes a first buffer member and a first connecting member sleeved on the first grounding electrode. The first buffer member is located between the first positioning washer and the first connecting member.
[0015] In some embodiments of the present utility model, the first buffer member includes a first upper fixing sleeve sleeved on the first grounding electrode, 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, and both ends of the first spring abut against the first upper fixing sleeve and the first lower fixing sleeve respectively.
[0016] In some embodiments of the present utility model, the measuring tube includes a lining tube and an outer shell tube. The inner part of the lining tube forms the water inlet cavity, and the outer shell tube is sleeved outside the lining tube.
[0017] In some embodiments of the present utility model, the measuring tube has a communication cavity. The inner diameter of the communication cavity is equal to the inner diameter of the first end of the water inlet cavity, and the first end of the water inlet cavity communicates with the communication cavity.
[0018] In some embodiments of the present utility model, the measuring tube further has a water outlet cavity. The water outlet cavity has a first end and a second end. The inner diameter of the water outlet cavity gradually decreases from the second end to the first end, and the side wall of the first end of the water outlet cavity is an inclined surface. The first end of the water outlet cavity communicates with the communication cavity.
[0019] In some embodiments of the present utility model, the electromagnetic flowmeter includes a second grounding electrode. A second through hole is provided at the bottom of the side wall of the first end of the water outlet cavity. The second grounding electrode passes through the second through hole, and the edge of the electrode end face of the second grounding electrode is flush with the inner wall of the water outlet cavity.
[0020] In some embodiments of the present utility model, the electromagnetic flowmeter includes measuring electrodes, and the measuring electrodes are connected to the side wall of the communication cavity. BRIEF 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 view of the electromagnetic flowmeter provided by the present utility model from a certain perspective;
[0023] Figure 2 is a cross-sectional view of the electromagnetic flowmeter provided by the present utility model from another perspective;
[0024] Figure 3 is Figure 2 the partial enlarged view at A in
[0025] Figure 4 is Figure 2 The partial enlarged view at position B in
[0026] In the figure:
[0027] 100, measuring tube; 110, inner lining tube; 101, water inlet cavity; 102, connecting cavity; 103, water outlet cavity; 120, outer shell tube; 130, flange;
[0028] 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;
[0029] 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 piece;
[0030] 400, exciting assembly; 410, measuring electrode; 420, exciting coil; 430, silicon steel sheet; 440, iron core;
[0031] 500, sealing assembly; 510, side plate; 520, cover plate. Detailed implementation manners
[0032] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the 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.
[0033] It should be understood that the terms used herein are for the purpose of describing particular 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 "comprising", "including", "containing", and "having" 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 order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.
[0034] Although terms such as first, second, and third 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. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms do not imply an order or sequence when used herein. 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 exemplary embodiments.
[0035] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. 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 figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both the above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.
[0036] See Figure 1 and Figure 2 In this embodiment, an electromagnetic flowmeter is provided, which includes a measuring tube 100, a first grounding electrode 200, and a first connection assembly 210. The measuring tube 100 has a water inlet chamber 101, the water inlet chamber 101 has a first end and a second end, the inner diameter of the water inlet chamber 101 gradually decreases from the second end to the first end, and the side wall of the first end of the water inlet chamber 101 is an inclined surface. A first through hole is provided at the bottom of the side wall of the first end of the water inlet chamber 101; the first grounding electrode 200 is connected to the first through hole, and the edge of the electrode end face of the first grounding electrode 200 is flush with the inner wall of the water inlet chamber 101; the first connection assembly 210 is hermetically connected to the bottom of the first grounding electrode 200, and the first connection assembly 210 is hermetically connected to the measuring tube 100.
[0037] The above electromagnetic flowmeter changes the water flow velocity by changing the bushing structure. Since the inner diameter of the water inlet cavity 101 gradually decreases from the second end to the first end, the water flow velocity gradually increases after the water enters the water inlet cavity 101. At the same time, the side wall of the first end of the water inlet cavity 101 forms an inclined surface, and the first grounding electrode 200 is located on the inclined surface. The water flow with increased velocity can wash the surface of the first grounding electrode 200, and the dirt washed down is easily carried away by the water flow. Therefore, the dirt in the fluid is not easily deposited on the first grounding electrode 200, effectively avoiding the influence of its function by dirt or sediment. By arranging the first grounding electrode 200 at the bottom of the water inlet cavity 101, the situation where the first grounding electrode 200 cannot be contacted when the water flow in the pipe is not full can be prevented. The edge of the electrode end face of the first grounding electrode 200 is flush with the inner wall of the water inlet cavity 101, so that the flow velocity of the fluid in the water inlet cavity 101 can be prevented from being affected by the first grounding electrode 200, and at the same time, the dead angle where dirt or sediment is likely to accumulate between the first grounding electrode 200 and the side wall of the water inlet cavity 101 can be avoided. The first grounding electrode 200 and the measuring pipe 100 are hermetically connected by using the first connecting assembly 210 to prevent the fluid from flowing out from the first through hole and ensure the tightness of the measuring pipe 100.
[0038] In some embodiments, the top of the first grounding electrode 200 is funnel-shaped, that is, the outer diameter gradually decreases from the top to the bottom. During the assembly process, the bottom of the first grounding electrode 200 extends from the inside of the inner lining pipe 110 to the outside, and the funnel-shaped top is clamped in the first through hole. Optionally, the aperture of the first through hole gradually decreases from the top to the bottom, so as to be adapted to the shape of the top of the first grounding electrode 200, ensuring that the edge of the electrode end of the first grounding electrode 200 is flush with the edge of the first through hole, thereby avoiding the accumulation of sediment or dirt between the edge of the electrode end and the edge of the first through hole, which affects the normal operation and service life of the first grounding electrode 200.
[0039] Furthermore, the measuring tube 100 includes a lining tube 110 and an outer shell tube 120. An inlet cavity 101 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 304 stainless steel tubing. Since the fluid to be measured is a conductive liquid, in order 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, tetrafluoroethylene or other plastic materials that can insulate the fluid from the outer shell tube 120. 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.
[0040] Furthermore, an exciting assembly 400 is provided inside the cavity. The exciting assembly 400 includes a measuring electrode 410, an exciting coil 420, a silicon steel sheet 430 and an iron core 440. Optionally, the measuring electrode 410 is connected to the side wall of the communication cavity 102. The outer periphery of the electrode end face of the measuring electrode 410 is flush with the side wall of the communication cavity 102, so as to avoid the measuring electrode 410 affecting the flow rate of the fluid in the communication cavity 102. Optionally, the number of the measuring electrodes 410 is two, and the two measuring 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 sheet 430 is coated outside the exciting coil 420 to form a closed magnetic circuit. The assembly and connection method of the exciting assembly 400 are mature prior arts in the field and will not be described in detail here.
[0041] Furthermore, referring to Figure 3, the first connection component 210 includes a first fixing sleeve 211 sleeved on the first grounding electrode 200, a first sealing ring 212 and a first positioning washer 213. 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 component 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 arranging 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, the fluid in the inner liner tube 110 can be prevented 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.
[0042] Furthermore, the first fixing sleeve 211 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 is connected to the first through hole, and the extending section abuts against the measuring tube 100. Optionally, an external thread is provided on the connecting section, and an internal thread is provided on the first through hole. The connecting section and the first through hole are threadedly connected. The threaded connection method is convenient and has high sealing performance. 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. Optionally, the first positioning washer 213 includes a first section and a second section connected to each other. The outer diameter of the first section is smaller than that of the second section. The first section is inserted into the bottom of the first fixing sleeve 211, and the second section abuts against the bottom of the first fixing sleeve 211. It can be understood that the second section plays a positioning role in the assembly process of the first positioning washer 213 and the first fixing sleeve 211, ensuring that the first positioning washer 213 is installed in place.
[0043] Furthermore, the first connection component 210 includes a first buffer member and a first connecting member 217 sleeved on the first grounding electrode 200. The first buffer member is located between the first positioning washer 213 and the first connecting member 217. By arranging the first buffer member between the first positioning washer 213 and the first connecting member 217, the first positioning washer 213 can be prevented from being crushed.
[0044] Further, the first buffer member includes a first upper fixing sleeve 214 sleeved on the first grounding electrode 200, 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 in the first buffer member, ensuring that the first grounding electrode 200 can be stably and firmly connected to the first through hole.
[0045] 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.
[0046] Further, the measuring tube 100 has a communication cavity 102, and the inner diameter of the communication cavity 102 is equal to the inner diameter of the first end of the water inlet cavity 101, and the first end of the water inlet cavity 101 communicates with the communication cavity 102. When water flows through the communication cavity 102, due to the increase in flow rate, it is more conducive to the acquisition of sensor signals, and the reduction of the magnetic circuit gap in the communication cavity 102 is beneficial to increasing the magnetic induction intensity.
[0047] Further, the measuring tube 100 further has a water outlet cavity 103. The water outlet cavity 103 has a first end and a second end. The inner diameter of the water outlet cavity 103 gradually decreases from the second end to the first end, and the side wall of the first end of the water outlet cavity 103 is an inclined surface. The first end of the water outlet cavity 103 communicates with the communication cavity 102. Preferably, the water outlet cavity 103 and the water inlet cavity 101 are symmetrically arranged to ensure that the flow velocity distribution of the fluid is centrosymmetric with respect to the center of the measuring tube 100, so that the magnetic field is uniform and the measurement result is more accurate.
[0048] See Figure 2, in some embodiments, the electromagnetic flowmeter includes a second grounding electrode 300. A second through hole is provided at the bottom of the side wall of the first end of the water outlet chamber 103. The second grounding electrode 300 is inserted through the second through hole, and the edge of the electrode end face of the second grounding electrode 300 is flush with the inner wall of the water outlet chamber 103. By adding a grounding electrode in the water outlet chamber 103, the circuit can be ensured to be more stable. Optionally, the second grounding electrode 300 and the first grounding electrode 200 are symmetrically arranged. It can be understood that the second grounding electrode 300 is located on the side with a larger flow rate in the water outlet chamber 103, and the second grounding electrode 300 is located on the inclined surface. Therefore, it can effectively prevent dirt or sediment from accumulating on the second grounding electrode 300. At the same time, the edge of the electrode end face of the second grounding electrode 300 is flush with the inner wall of the water outlet chamber 103, which can prevent dirt or sediment from accumulating at the junction of the second grounding electrode 300 and the inner wall of the water outlet chamber 103.
[0049] Optionally, referring to Figure 4 , a second connection assembly 310 is hermetically sleeved on 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 can 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.
[0050] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. 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 utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.
Claims
1. An electromagnetic flowmeter, characterized in that, Comprising: A measuring tube (100), the measuring tube (100) having a water inlet chamber (101), the water inlet chamber (101) having a first end and a second end, the inner diameter of the water inlet chamber (101) gradually decreasing from the second end to the first end and the side wall of the first end of the water inlet chamber (101) being an inclined surface, and a first through hole being provided at the bottom of the side wall of the first end of the water inlet chamber (101); A first grounding electrode (200), the first grounding electrode (200) being connected to the first through hole, and the edge of the electrode end face of the first grounding electrode (200) being flush with the inner wall of the water inlet chamber (101); A first connection assembly (210), the first connection assembly (210) being sealingly connected to the bottom of the first grounding electrode (200), and the first connection assembly (210) and the measuring tube (100) being sealingly connected.
2. The electromagnetic flowmeter according to claim 1, wherein, The first connection assembly (210) includes a first fixing sleeve (211), a first sealing ring (212) and a first positioning washer (213) sleeved on the first grounding electrode (200), the first fixing sleeve (211) being sealingly connected to the first through hole, the first sealing ring (212) being located inside the first fixing sleeve (211), and the top of the first positioning washer (213) being inserted into the first fixing sleeve (211) and abutting against the first sealing ring (212).
3. The electromagnetic flowmeter according to claim 2, characterized in that, The first fixing sleeve (211) includes a connecting section and an extending section connected to each other, the outer diameter of the connecting section being smaller than the outer diameter of the extending section, the connecting section being connected to the first through hole, and the extending section abutting against the measuring tube (100).
4. The electromagnetic flowmeter according to claim 3, characterized in that, The first connection assembly (210) includes a first buffer member and a first connecting member (217) 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).
5. The electromagnetic flowmeter according to claim 4, 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) sleeved on the first grounding electrode (200), the top of the first upper fixing sleeve (214) abutting against the first positioning washer (213), the bottom of the first lower fixing sleeve (216) abutting against the first connecting member (217), and the two ends of the first spring (215) respectively abutting against the first upper fixing sleeve (214) and the first lower fixing sleeve (216).
6. The electromagnetic flowmeter according to any one of claims 1-5, characterized in that, The measuring tube (100) includes a lining tube (110) and an outer shell tube (120), the inner part of the lining tube (110) forming the water inlet chamber (101), and the outer shell tube (120) being sleeved outside the lining tube (110).
7. The electromagnetic flowmeter according to any one of claims 1-5, characterized in that, The measuring tube (100) has a communication chamber (102), the inner diameter of the communication chamber (102) being equal to the inner diameter of the first end of the water inlet chamber (101), and the first end of the water inlet chamber (101) being communicated with the communication chamber (102).
8. The electromagnetic flowmeter according to claim 7, wherein, The measurement tube (100) further has a water outlet cavity (103), the water outlet cavity (103) has a first end and a second end, the inner diameter of the water outlet cavity (103) gradually decreases from the second end to the first end, and the side wall of the first end of the water outlet cavity (103) is an inclined surface. The first end of the water outlet cavity (103) communicates with the communication cavity (102).
9. The electromagnetic flowmeter according to claim 8, characterized in that, The electromagnetic flowmeter includes a second grounding electrode (300). A second through hole is provided at the bottom of the side wall of the first end of the water outlet cavity (103). The second grounding electrode (300) is inserted through the second through hole, and the edge of the electrode end face of the second grounding electrode (300) is flush with the inner wall of the water outlet cavity (103).
10. The electromagnetic flowmeter according to claim 7, characterized in that, The electromagnetic flowmeter includes a measurement electrode (410), and the measurement electrode (410) is connected to the side wall of the communication cavity (102).