Split flow meter

Abstract

The utility model discloses a kind of split flowmeter, including impeller module and sensor module, impeller module includes first encapsulation, second encapsulation, impeller and wheel shaft, multiple blades are shaped on the surface of impeller, magnet module is embedded in the inside of impeller, impeller, magnet module is tightly fitted on wheel shaft, one end of wheel shaft is rotatably connected with first encapsulation, the other end is rotatably connected with second encapsulation, first encapsulation is connected with second encapsulation to form modular structure, sensor module includes module shell and hall sensor, hall sensor is encapsulated inside module shell, to form modular structure, sensor module and impeller module adopt split modular design, split design makes sensor module, impeller module can be independently packaged, avoid the space waste caused by irregular shape of traditional integral structure, improve the space utilization when transporting, and can adapt to different specifications shape flowmeter shell, to improve the flexibility and customizability of flowmeter.

Description

Technical Field

[0001] This utility model relates to the field of flow meter technology, specifically a split-type flow meter. Background Technology

[0002] A Hall effect flow meter is a non-contact flow measurement device based on the Hall effect. The fluid drives the impeller to rotate, and the permanent magnet attached to the impeller periodically changes the magnetic field strength at the Hall sensor. The sensor outputs a pulse signal, and the pulse frequency is linearly related to the fluid flow rate. The cumulative flow rate is then obtained by integration calculation. The core components of the Hall effect flow meter include the impeller assembly, the sensor element, and the mounting housing.

[0003] Currently, Hall effect flow meters on the market typically adopt an integrated design. Their production process requires sequential steps such as impeller assembly and sensor module welding, resulting in a lengthy production cycle. Furthermore, the integrated design of flow meters also has the following drawbacks: when a core component of the flow meter fails, due to the high integration of various components, it is difficult to accurately locate and quickly replace a single faulty component, often requiring the replacement of the entire flow meter. This not only increases maintenance costs but also wastes resources. On the other hand, the integrated design limits the flexibility and customizability of the product. Different application scenarios have diverse requirements for the performance parameters, size specifications, etc. of Hall effect flow meters, and the integrated design makes it difficult to optimize or adjust a single component according to specific needs, making it difficult to meet the personalized needs of the market. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a split-type flow meter, which can effectively solve the technical problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a split flow meter, including an impeller module, the impeller module including a first package, a second package, an impeller and a shaft, the surface of the impeller is formed with multiple blades, a magnet module is embedded inside the impeller, the impeller and the magnet module are tightly fitted on the shaft, one end of the shaft is rotatably connected to the first package, and the other end is rotatably connected to the second package, the first package and the second package are engaged to form a modular structure.

[0006] Furthermore, both the first and second packages are provided with rotating connecting blocks. The rotating connecting blocks have a movable groove at one end facing the wheel shaft. The impeller is located between the two rotating connecting blocks, and the wheel shaft is inserted into the interior of the movable groove. The wheel shaft and the inner wall of the movable groove have a rotational clearance to form a rotational fit, so that the wheel shaft can rotate relative to the first and second packages around its own axis. The wheel shaft drives the impeller and the magnet module to rotate synchronously with it. In addition, the blades have a distance from the inner walls of the first and second packages to avoid contact jamming between the blades and the inner walls of the first and second packages.

[0007] Furthermore, both the first and second packages are provided with a support ball, and a ring-shaped clamping part is formed at the inner end of the movable groove. The support ball is fixed on the clamping part by an interference fit, and the diameter of the support ball is greater than the axial length of the clamping part, so that the spherical surface of the support ball protrudes from the end face of the clamping part.

[0008] The wheel axle and the end of the movable groove have an axial sliding clearance to form a sliding fit, so that when the impeller is impacted by liquid, it can perform a combined motion of rotation and axial offset relative to the first and second encapsulation components. When the wheel axle contacts the support ball, the plane of the wheel axle and the spherical surface of the support ball form a point contact to reduce the contact area and reduce the frictional resistance when the wheel axle rotates.

[0009] Furthermore, multiple blades are evenly spaced along the circumference of the impeller, and each blade extends spirally along the axial direction of the impeller. The twisting direction of the blades is reversed at the middle position of the impeller, so that the blades form a bidirectional helical surface.

[0010] Furthermore, the first package contains a diversion component, which includes at least one diversion block. One end of the diversion block is fastened to the inner wall of the first package, and the other end is fastened to the outer wall of the rotating connecting block, such that the rotating connecting block is coaxially arranged with the first package.

[0011] Furthermore, it also includes a sensor module, which comprises a module housing and a Hall sensor, the Hall sensor being encapsulated inside the module housing to form a modular structure.

[0012] Furthermore, it also includes a housing, the interior of which is hollow to form a first flow channel for liquid to flow through. The outer side of the housing is provided with a first locking groove adapted to the sensor module, and the interior of the housing is provided with a second locking groove adapted to the impeller module. The sensor module is fastened in the first locking groove, and the impeller module is fastened in the second locking groove. The positions of the sensor module and the impeller module are matched so that the sensor module can sense the rotational speed or number of rotations of the impeller module.

[0013] Furthermore, the second package is formed with a foolproof bump, and the inner wall of the first flow channel is formed with a first annular bump and a second annular bump in sequence along the liquid flow direction.

[0014] The impeller module is embedded in the second slot, wherein the first package abuts against the end face of the first annular protrusion, the outer wall of the second package fits tightly against the inner wall of the second annular protrusion, and the anti-fooling protrusion abuts against the end face of the second annular protrusion, so that the impeller module and the housing are coaxially arranged.

[0015] Furthermore, the outer casing is provided with an inlet and an outlet that connect to the first flow channel. A plug is fitted at one end of the outer casing near the outlet. The plug has a connecting end that is inserted into the inside of the outer casing and abuts against the anti-fooling protrusion to restrict the position of the impeller module.

[0016] Furthermore, a TDS probe is fitted to one end of the outer casing near the water inlet.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] The housing, sensor module, and impeller module adopt a separate modular design, making them standard parts. This saves steps such as impeller assembly and sensor module welding. Furthermore, the separate design allows the housing, sensor module, and impeller module to be packaged independently, avoiding the space waste caused by the irregular shape of the traditional integral structure. This improves the space utilization during transportation and can adapt to flow meter housings of different specifications and shapes, thus increasing the flexibility and customizability of the flow meter. Attached Figure Description

[0019] Figure 1 This is a three-dimensional cross-sectional view of the impeller module;

[0020] Figure 2 This is a planar cross-sectional view of the impeller module;

[0021] Figure 3 This is an exploded view of the impeller module.

[0022] Figure 4 This is a schematic diagram of the impeller structure;

[0023] Figure 5 This is a schematic diagram of the overall structure of a split-type flow meter;

[0024] Figure 6 This is a schematic diagram showing the assembly state of the impeller module and the housing;

[0025] Figure 7 This is a cross-sectional view of the outer shell;

[0026] Figure 8This is a schematic diagram of the assembly structure of the sensor module, housing, and impeller module.

[0027] Numbering on the map:

[0028] 1. Housing; 2. Sensor module; 3. Impeller module; 4. TDS probe; 5. Inlet; 6. Module housing; 7. Positioning groove; 8. Second locking groove; 9. Outlet; 10. Sealing head; 11. Connecting end; 12. Positioning post; 13. First annular protrusion; 14. Second annular protrusion; 16. Magnet module; 17. Wheel shaft; 18. First encapsulation component; 19. Rotating connecting block; 21. Support ball; 22. Clamping part; 23. Impeller; 24. Second encapsulation component; 25. Foolproof protrusion; 26. Blade; 27. Movable groove; 28. Slot; 29. ​​Interference fit protrusion; 30. Locking block; 31. Diverter block. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figure 1-4 As shown, this utility model provides a split-type flow meter, including a sensor module 2 and an impeller module 3. The impeller module 3 includes a first package 18, a second package 24, an impeller 23, and a shaft 17. The first package 18 and the second package 24 are hollow to form a second flow channel for liquid to flow through. The surface of the impeller 23 is formed with multiple blades 26. A magnet module 16 is embedded inside the impeller 23. The end of the impeller 23 near the second package 24 is provided with a mounting cavity. The magnet module 16 is assembled inside the mounting cavity. The impeller 23 and the magnet module 16 are tightly fitted on the shaft 17. One end of the shaft 17 is rotatably connected to the first package 18, and the other end is rotatably connected to the second package 24. The first package 18 and the second package 24 are engaged to form a modular structure.

[0031] In this embodiment, the first package 18 has a slot 28, and the inner wall of the slot 28 is provided with an interference protrusion 29. The second package 24 is provided with a block 30, which is inserted into the slot 28. The interference protrusion 29 abuts against the block 30, so that the first package 18 and the second package 24 are fastened together by interference fit.

[0032] Multiple blades 26 are evenly distributed along the circumference of the impeller 23, and each blade 26 extends spirally along the axial direction of the impeller 23. The twisting direction of the blade 26 is reversed at the middle position of the impeller 23, so that the blade 26 forms a bidirectional helical surface.

[0033] The first package 18 has a flow-diverting component inside, which includes at least one flow-diverting block 31. In this embodiment, three flow-diverting blocks 31 are provided. One end of each flow-diverting block 31 is fastened to the inner wall of the first package 18, and the other end is fastened to the outer wall of the rotating connecting block 19, so that the rotating connecting block 19 is coaxially arranged with the first package 18. When the liquid flows into the first flow channel from the inlet 5, it will have a certain pressure and kinetic energy, and rush towards the impeller module 3 in a turbulent and disordered state. The design of the flow-diverting block 31 is to divide the water flow into multiple relatively independent flow paths when it enters the second flow channel, so that the water flow can be more uniform and orderly. The flow avoids mutual interference and collision between water flows, reducing energy loss caused by water flow turbulence. After being guided by the flow divider 31, the water flows along the spiral direction of the blade 26. The design of the bidirectional spiral curved surface of the blade 26 allows the water flow to continuously apply a tangential force along the spiral direction to the blade 26 during the flow process. As the water flow continues to spiral along the blade 26, the continuous tangential force acts on the blade 26, causing the impeller 23 to begin to rotate around its axis. The structural design of the flow divider 31 and the blade 26 can effectively reduce hydraulic loss, improve energy conversion efficiency, and thus improve the measurement accuracy of the flow meter.

[0034] Both the first package 18 and the second package 24 are provided with rotating connecting blocks 19. One end of the rotating connecting block 19 facing the axle 17 has a movable groove 27. The impeller 23 is located between the two rotating connecting blocks 19. The axle 17 is inserted into the movable groove 27. The axle 17 and the inner wall of the movable groove 27 have a rotational clearance to form a rotational fit, allowing the axle 17 to rotate relative to the first package 18 and the second package 24 around its own axis. The axle 17 drives the impeller 23 and the magnet module 16 to rotate synchronously with it. Furthermore, the blades 26 are connected to the inner walls of the first package 18 and the second package 24. The walls have spacing to prevent the blades 26 from contacting and getting stuck with the inner walls of the first package 18 and the second package 24. Since the wheel shaft 17 drives the impeller 23 and the magnet module 16 to rotate synchronously, the rotation of the magnet module 16 will generate a corresponding signal and be sensed by the Hall sensor. If the speed is unstable due to the blades 26 contacting and getting stuck with the inner wall of the package, the signal generated by the magnet module 16 will also fluctuate and become inaccurate. Therefore, this design ensures the stability of the impeller 23 speed, enabling the magnet module 16 to generate a stable and accurate signal, thereby improving the measurement accuracy of the flow meter.

[0035] Both the first encapsulation component 18 and the second encapsulation component 24 are provided with support balls 21. A ring-shaped clamping part 22 is formed at the inner end of the movable groove 27. The support balls 21 are fixed to the clamping part 22 by an interference fit, and the diameter of the support balls 21 is larger than the axial length of the clamping part 22, causing the spherical surface of the support balls 21 to protrude from the end face of the clamping part 22. The wheel shaft 17 and the end of the movable groove 27 have an axial sliding clearance to form a sliding fit, allowing the impeller 23 to rotate relative to the first encapsulation component 18 and the second encapsulation component 24 and move axially when impacted by liquid. The offset composite motion, and when the wheel shaft 17 contacts the support ball 21, the plane of the wheel shaft 17 and the spherical surface of the support ball 21 form a point contact. Compared with the surface-to-surface contact, the point contact greatly reduces the contact area. During the rotation of the impeller 23, the smaller contact area means that the wheel shaft 17 experiences less frictional resistance, thereby ensuring the stability of the impeller 23's rotation speed. The stable rotation speed enables the magnet module 16 to generate regular and accurate electrical signals, reducing signal errors caused by rotation speed fluctuations, and thus improving the measurement accuracy of the flow meter.

[0036] The sensor module 2 includes a module housing 6 and a Hall sensor. The Hall sensor is encapsulated inside the module housing 6 to form a modular structure. In this embodiment, the modular structure of the sensor module 2 is achieved by encapsulating the Hall sensor circuit board with resin injection.

[0037] like Figure 5-8 As shown, it also includes a housing 1, which is hollow inside to form a first flow channel for liquid to flow through. The housing 1 is provided with an inlet 5 and an outlet 9 that communicate with the first flow channel. A TDS probe 4 is installed at one end of the housing 1 near the inlet 5. The TDS probe 4 is used to monitor the quality of the incoming water in real time, reflect the purity of the incoming water, provide water quality parameter compensation for flow measurement, and assist in evaluating the influence of fluid characteristics on the measurement.

[0038] The outer casing 1 has a second locking groove 8 that is adapted to the impeller module 3. The impeller module 3 is fastened in the second locking groove 8. The second encapsulation 24 is formed with a foolproof protrusion 25. The inner wall of the first flow channel is sequentially formed with a first annular protrusion 13 and a second annular protrusion 14 along the liquid flow direction. The end face of the first annular protrusion 13 forms the bottom of the second locking groove 8, the inner wall of the second annular protrusion 14 forms the limiting surface of the second locking groove 8, and the end face of the second annular protrusion 14 forms the top of the second locking groove 8. The impeller module 3 is embedded in the second locking groove 8, wherein the first encapsulation 18 abuts against the end face of the first annular protrusion 13, and the second The outer wall of the encapsulation component 24 is tightly fitted to the inner wall of the second annular protrusion 14, and the anti-fooling protrusion 25 abuts against the end face of the second annular protrusion 14, so that the impeller module 3 and the housing 1 are coaxially arranged. The end of the housing 1 near the outlet 9 is equipped with a sealing head 10. The sealing head 10 is provided with a connecting end 11. The connecting end 11 is inserted into the inside of the housing 1 and abuts against the anti-fooling protrusion 25 to restrict the position of the impeller module 3. On the one hand, the design of the anti-fooling block can play a positioning role, so that the impeller module 3 can be assembled in the correct installation position. On the other hand, the anti-fooling block can prevent the impeller module 3 from being installed backwards and improve the ease of installation.

[0039] The outer side of the outer shell 1 is provided with a first slot that is adapted to the sensor module 2. The sensor module 2 is fastened in the first slot. The first slot is provided with a positioning post 12. The module housing 6 is provided with a positioning groove 7. The positioning post 12 is fixed in the positioning groove 7 by an interference fit, so that the sensor module 2 is fastened in the first slot.

[0040] After the sensor module 2 and impeller 23 module are assembled with the housing 1, the positions of the sensor module 2 and the impeller module 3 are matched so that the sensor module 2 can sense the rotation speed or number of rotations of the impeller module 3.

[0041] Compared to traditional technologies:

[0042] 1. By adopting a modular design for the housing 1, sensor module 2, and impeller module 3, these components become standard parts, saving steps such as impeller 23 assembly and sensor module 2 welding. Furthermore, the modular design allows for independent packaging of the housing 1, sensor module 2, and impeller module 3, avoiding space waste caused by irregular shapes in traditional integral structures, improving space utilization during transportation, and adapting to different specifications and shapes of flowmeter housings 1. This enhances the flexibility and customizability of the flowmeter. A first slot for the sensor module 2 is provided on the outside of the housing 1, and a... The second slot 8 is adapted to the impeller module 3. The design of the first slot can quickly position and install the sensor module 2, and the design of the second slot 8 can quickly position and install the impeller 23 module. After the sensor module 2 and the impeller 23 module are assembled with the housing 1, the positions of the sensor module 2 and the impeller module 3 are matched, so that the sensor module 2 can sense the rotation speed or number of rotations of the impeller module 3. The design of the first slot and the second slot 8 can greatly improve the installation efficiency of the flow meter and ensure that the impeller module 3 and the sensor module 2 form the optimal sensing match, which significantly improves the installation convenience of the flow meter and ensures the measurement accuracy of the flow meter.

[0043] 2. The support ball 21 is fixed to the clamping part 22 by an interference fit, and the diameter of the support ball 21 is greater than the axial length of the clamping part 22, so that the spherical surface of the support ball 21 protrudes from the end face of the clamping part 22. The wheel shaft 17 and the end of the movable groove 27 have an axial sliding clearance to form a sliding fit, so that when the impeller 23 is impacted by liquid, it can perform a compound motion of rotation and axial offset relative to the first package 18 and the second package 24. When the wheel shaft 17 and the support ball 21 are in contact, the plane of the wheel shaft 17 and the spherical surface of the support ball 21 form a point contact. Compared with the surface-to-surface contact, the point contact greatly reduces the contact area. During the rotation of the impeller 23, the smaller contact area means that the wheel shaft 17 is subjected to less frictional resistance, thereby ensuring the stability of the speed of the impeller 23. The stable speed can enable the magnet module 16 to generate regular and accurate electrical signals, reduce the signal error caused by speed fluctuations, and thus improve the measurement accuracy of the flow meter.

[0044] 3. Multiple blades 26 are evenly spaced along the circumference of the impeller 23, and each blade 26 extends spirally along the axial direction of the impeller 23. The twisting direction of the blades 26 is reversed at the middle position of the impeller 23, so that the blades 26 form a bidirectional spiral surface. Three flow dividers 31 are provided. One end of the flow divider 31 is fastened to the inner wall of the first encapsulation 18, and the other end is fastened to the outer wall of the rotating connecting block 19, so that the rotating connecting block 19 is coaxially arranged with the first encapsulation 18. When the liquid flows into the first flow channel from the inlet 5, it will have a certain pressure and kinetic energy, and rush towards the impeller module 3 in a turbulent and disordered state. The design of the flow divider 31 is to divide the water flow into multiple relative Independent flow paths allow water to flow more evenly and orderly, avoiding mutual interference and collision between water flows and reducing energy loss caused by turbulent flow. After being guided by the flow divider 31, the water flows along the spiral direction of the blade 26. The design of the bidirectional spiral curved surface of the blade 26 allows the water to continuously apply a tangential force along the spiral direction to the blade 26 during the flow process. As the water flows continuously along the spiral direction of the blade 26, the continuous tangential force acts on the blade 26, causing the impeller 23 to begin rotating around its axis. The structural design of the flow divider 31 and the blade 26 can effectively reduce hydraulic loss, improve energy conversion efficiency, and thus improve the measurement accuracy of the flow meter.

[0045] 4. The second encapsulation component 24 is formed with a foolproof protrusion 25. The inner wall of the first flow channel is sequentially formed with a first annular protrusion 13 and a second annular protrusion 14 along the liquid flow direction. The end face of the first annular protrusion 13 forms the bottom of the second locking groove 8, the inner wall of the second annular protrusion 14 forms the limiting surface of the second locking groove 8, and the end face of the second annular protrusion 14 forms the top of the second locking groove 8. The impeller module 3 is embedded inside the second locking groove 8. The first encapsulation component 18 abuts against the end face of the first annular protrusion 13, and the outer wall of the second encapsulation component 24 abuts against the end face of the second annular protrusion 14. 4. The inner wall fits tightly, and the anti-fooling protrusion 25 abuts against the end face of the second annular protrusion 14, so that the impeller module 3 and the outer shell 1 are coaxially arranged. The end of the outer shell 1 near the outlet 9 is equipped with a sealing head 10. The sealing head 10 is provided with a connecting end 11. The connecting end 11 is inserted into the inside of the outer shell 1 and abuts against the anti-fooling protrusion 25 to restrict the position of the impeller module 3. On the one hand, the design of the anti-fooling block can play a positioning role, so that the impeller module 3 can be installed in the correct installation position. On the other hand, the anti-fooling block can prevent the impeller module 3 from being installed backwards.

[0046] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A split-type flow meter, characterized in that, The impeller module includes a first package, a second package, an impeller, and a shaft. Multiple blades are formed on the surface of the impeller, and a magnet module is embedded inside the impeller. The impeller and the magnet module are tightly fitted onto the shaft. One end of the shaft is rotatably connected to the first package and the other end is rotatably connected to the second package. The first package and the second package are engaged to form a modular structure.

2. The split-type flow meter according to claim 1, characterized in that, Both the first and second packages are provided with rotating connecting blocks. The rotating connecting blocks have a movable groove at one end facing the wheel shaft. The impeller is located between the two rotating connecting blocks, and the wheel shaft is inserted into the interior of the movable groove. The wheel shaft and the inner wall of the movable groove have a rotational clearance to form a rotational fit, so that the wheel shaft can rotate relative to the first and second packages around its own axis. The wheel shaft drives the impeller and the magnet module to rotate synchronously with it. Furthermore, the blades have a distance from the inner walls of the first and second packages to avoid contact jamming between the blades and the inner walls of the first and second packages.

3. A split-type flow meter according to claim 2, characterized in that, Both the first and second packages are provided with a support ball, and a ring-shaped clamping part is formed at the inner end of the movable groove. The support ball is fixed on the clamping part by an interference fit, and the diameter of the support ball is greater than the axial length of the clamping part, so that the spherical surface of the support ball protrudes from the end face of the clamping part. The wheel axle and the end of the movable groove have an axial sliding clearance to form a sliding fit, so that when the impeller is impacted by liquid, it can perform a combined motion of rotation and axial offset relative to the first and second encapsulation components. When the wheel axle contacts the support ball, the plane of the wheel axle and the spherical surface of the support ball form a point contact to reduce the contact area and reduce the frictional resistance when the wheel axle rotates.

4. A split-type flow meter according to claim 2, characterized in that, Multiple blades are evenly spaced along the circumference of the impeller, and each blade extends spirally along the axial direction of the impeller. The twisting direction of the blades is reversed at the middle position of the impeller, so that the blades form a bidirectional helical surface.

5. A split-type flow meter according to claim 4, characterized in that, The first package has a flow-diverting component inside. The flow-diverting component includes at least one flow-diverting block. One end of the flow-diverting block is fastened to the inner wall of the first package, and the other end is fastened to the outer wall of the rotating connecting block, so that the rotating connecting block is coaxially arranged with the first package.

6. A split-type flow meter according to claim 1, characterized in that, It also includes a sensor module, which comprises a module housing and a Hall sensor, with the Hall sensor encapsulated inside the module housing to form a modular structure.

7. A split-type flow meter according to claim 6, characterized in that, It also includes a housing, the interior of which is hollow to form a first flow channel for liquid to flow through. The outer side of the housing is provided with a first slot adapted to the sensor module, and the interior of the housing is provided with a second slot adapted to the impeller module. The sensor module is fastened in the first slot and the impeller module is fastened in the second slot. The positions of the sensor module and the impeller module are matched so that the sensor module can sense the rotational speed or number of rotations of the impeller module.

8. A split-type flow meter according to claim 7, characterized in that, The second package has a foolproof bump, and the inner wall of the first flow channel has a first annular bump and a second annular bump formed sequentially along the liquid flow direction. The impeller module is embedded in the second slot, wherein the first package abuts against the end face of the first annular protrusion, the outer wall of the second package fits tightly against the inner wall of the second annular protrusion, and the anti-fooling protrusion abuts against the end face of the second annular protrusion, so that the impeller module and the housing are coaxially arranged.

9. A split-type flow meter according to claim 8, characterized in that, The outer casing is provided with an inlet and an outlet that connect to the first flow channel. A plug is installed at one end of the outer casing near the outlet. The plug has a connecting end that is inserted into the inside of the outer casing and abuts against the anti-fooling protrusion to restrict the position of the impeller module.

10. A split-type flow meter according to claim 9, characterized in that, A TDS probe is installed at one end of the outer casing near the water inlet.

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