Positive displacement water meter with interchangeable metering module

Abstract

The utility model discloses a volume water meter of interchangeable metering module, it includes metering module, counting module and permanent lower table shell, and the lower table shell is equipped with first water pipe, second water pipe and inner lining cylinder, and first water pipe communicates with the cylinder cavity of inner lining cylinder, and second water pipe communicates with the annular cavity of lower table shell, and the lower table shell is equipped with lower convex ring, the utility model discloses a volume water meter of interchangeable metering module, it includes metering module, counting module and permanent lower table shell, and the lower table shell is equipped with first water pipe, second water pipe and inner lining cylinder, and first water pipe communicates with the cylinder cavity of inner lining cylinder, and second water pipe communicates with the annular cavity of lower table shell, and the lower table shell is equipped with lower convex ring, the utility model discloses a volume water meter of interchangeable metering module, it includes metering module, counting module and permanent lower table shell, the upper convex ring of isolation mould shell and lower convex ring of lower table shell are clamped by hoop, the upper end of isolation mould shell is equipped with the diaphragm, and the outer wall of isolation mould shell is detachably connected with the lower mouth of upper cover, and the counting module is pressed on the diaphragm by upper cover, the counting module and metering module are connected through magnetic force coupling, the lower end of metering module annular baffle is fixed with annular plug connector, and the inner wall of isolation mould shell is detachably connected with the clamping ring, and the counting module is clamped in isolation mould shell by clamping ring, and annular plug connector and inner lining cylinder upper mouth seal plug connection.

Description

Technical Field

[0001] This utility model relates to the field of water metering instruments, specifically a volumetric water meter with interchangeable metering modules. Background Technology

[0002] Mechanical water meters on the market mainly fall into two categories: rotary vane type and volumetric type. Volumetric water meters measure the volume of fluid by successively filling and emptying a known chamber. They offer high measurement accuracy, with errors controllable below ±0.5%, a wide range, and are relatively expensive. Therefore, they are widely used in industrial water applications such as laboratories, precision manufacturing plants, and water treatment plants. This application pertains to volumetric water meters.

[0003] In 2022, the applicant proposed an interchangeable metering module water meter, patent number 2022103776540. The design concept of this technical solution is to divide the water meter into two parts: the lower part is a permanent lower casing that only needs to be installed into the water supply network initially and requires minimal replacement; the upper part is a cartridge-plug-in integrated module, which includes a meter cover, a movement, and an upward-opening module shell. The movement is an integrated wet-type movement that integrates the metering module and the counting module. A cylindrical plug-in interface is connected to the lower part of the module shell via a connector. During factory manufacturing, the movement is placed into the module shell, and the meter cover is tightened, pressing and sealing the stepped surface of the movement against the upper ring surface of the cylindrical plug-in interface. A lead seal is then applied to the screw-in area of ​​the meter cover, thus forming the upper integrated module. During installation, the user simply plugs the lower opening of the plug-in interface of the upper integrated module into the upper opening of the inner liner of the lower meter shell, and then uses a clamp to secure the upper protruding ring of the upper module shell and the lower protruding ring of the lower meter shell. In this way, the upper module of the water meter can be plugged into and disassembled with the permanent lower casing, which can serve to interchange the movement module. Moreover, the disassembly and assembly are convenient, so it has obvious advantages in terms of disassembly and cleaning, reducing the cost of using and replacing meters, and reducing transportation and logistics costs.

[0004] Of course, technicians have found through long-term use that the aforementioned water meters still have room for improvement. The biggest limitation of the existing water meter structure is that the metering module and the counting module in the movement are completely integrated into a wet movement with interconnected water circuits. Therefore, even if the metering module or the counting module is damaged individually, the entire movement must be replaced, which increases the cost of use. Replacing undamaged parts is also wasteful and uneconomical. Moreover, wet movements have a common problem: once the water supply stops, the water stored in the counting module at the top of the meter will be lost. When the water supply resumes, water will be refilled into the counting module, but it will not be able to fill it completely, creating mist inside the counting module that interferes with reading and billing. Furthermore, impurities in the water will also affect the accuracy of the measurement.

[0005] Furthermore, the metering module of a volumetric water meter includes a metering housing with a hollow piston chamber inside. The piston chamber houses a rotary piston, vertical baffles, and other components. The lower part of the metering housing has a first water inlet, a second water inlet, and an annular baffle separating the two water inlets. The first water inlet protrudes laterally from the annular baffle. Therefore, compared to a rotary vane water meter, the metering module of a volumetric water meter has a more complex structure and larger volume. Moreover, the shapes of the water inlets and baffles at the bottom of the metering module are irregular. As a result, it is difficult to fit the metering part into the module housing of the aforementioned cartridge-type water meter, as is the case with a rotary vane water meter. If it is forcibly assembled, the overall height of the module housing and the water meter will be significantly increased, which will lead to product disproportion, material waste, and an unattractive appearance, thus making it impractical. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a volumetric water meter that can separate the counting module or metering module of the mechanism, thereby realizing the interchangeability of the counting module or metering module, isolating the water inlet of the counting module, effectively controlling the height of the water meter, and providing interchangeable metering modules with both mechanical head counting module and electronic head counting module as options.

[0007] The technical solution of this utility model is to provide a volumetric water meter with interchangeable metering modules, which includes a movement and a permanent lower casing. The movement includes a metering module and a counting module. The metering module includes a first water inlet, a second water inlet, and an annular baffle separating the two water inlets. The lower casing is provided with a first water pipe and a second water pipe. The bottom plate of the lower casing is provided with an upward-opening inner liner. The first water pipe communicates with the inner liner cavity through a side through hole, and the second water pipe communicates with the annular cavity of the lower casing. The upper opening of the lower casing is provided with a lower convex ring. An isolation mold is provided outside the metering module, and an upper convex ring is provided at the lower part of the isolation mold. The upper convex ring and the lower convex ring of the lower casing are detachably sealed and clamped by a clamp.

[0008] The upper end of the isolation mold shell is provided with a horizontal partition for separating the counting modules, and the lower end of the isolation mold shell is open; the counting module is provided with an upper cover, the lower opening of the upper cover is detachably connected to the outer wall of the isolation mold shell, and the upper cover presses the counting module on the horizontal partition, and the counting module is circumferentially positioned with the horizontal partition; the counting module and the metering module are connected by magnetic coupling.

[0009] The metering module has an annular connector fixed at the lower end of the annular baffle, and the annular connector is equipped with a filter screen; the inner wall of the isolation mold shell is detachably connected with a retaining ring, which holds the metering module in the isolation mold shell, and the annular connector is sealed and plugged into the upper opening of the inner liner.

[0010] In the aforementioned volumetric water meter, the counting module is circumferentially positioned with the transverse partition and pressed firmly onto the transverse partition by the upper cover, thus achieving the installation of the counting module and the isolation mold shell. The metering module is relatively large and has an irregular lower shape, so it is directly secured to the lower edge of the metering module by a retaining ring to achieve the installation of the metering module and the isolation mold shell. An annular connector is directly fixed at the lower end of the annular baffle. In this way, the counting module, metering module, upper cover, and isolation mold shell form an integral upper module, which is plugged into the lower shell for assembly. The upper end of the annular connector is directly connected to the first water inlet, and the lower end of the annular connector is sealed to the upper end of the inner liner. The lower end of the isolation mold shell and the upper end of the lower shell are clamped and sealed, thus connecting the water path. This allows water to enter the inner cavity of the metering module along the first water pipe, the inner liner cavity, the filter screen, and the first water inlet of the metering module, pushing the piston to rotate, and continuing to flow out along the second water inlet of the metering module, the annular cavity of the lower shell, and the second water pipe. Of course, the completely opposite path can also be taken, with water entering from the second water pipe and exiting from the first water pipe. Furthermore, the metering module and the counting module are completely separated by a horizontal partition at the top of the isolation mold shell, and connected by a magnetic coupling structure located above and below the partition. This accurately transmits the number of piston rotations of the metering module to the counting module. While ensuring normal operation of the metering and counting, the counting module is completely sealed off from water, achieving a dry arrangement. In this way, after technicians remove the clamp seal and disassemble the integral upper module from the lower shell, they only need to remove the seal between the lower opening of the upper cover and the outer wall of the isolation mold shell to retain the metering module and replace the counting module separately. Alternatively, without removing the upper cover, only the retaining ring is removed from the lower opening of the isolation mold shell to retain the counting module and replace the metering module separately, thus achieving the function of individually interchangeable metering or counting modules.

[0011] As can be seen from the above analysis, the volumetric water meter with interchangeable metering modules of this application has the following advantages compared with the prior art.

[0012] This volumetric water meter, while ensuring normal metering and counting functions, allows for the individual replacement of either the metering module or the counting module. The disassembly and assembly process is convenient, and the damaged module can be replaced precisely, avoiding the drawbacks of existing technologies that require complete replacement of the entire mechanism upon failure. This effectively reduces usage and maintenance costs and avoids the waste caused by replacing undamaged modules along with the meter, resulting in strong economic benefits. Furthermore, because the counting section can be replaced individually, users have the flexibility to choose between mechanical and electronic counting modules. Mechanical and electronic modules each have their advantages: mechanical modules are stable and reliable, and the counting results are traceable; electronic modules do not involve electromechanical conversion, eliminating conversion errors and supporting intelligent remote transmission, facilitating customers to check and pay bills via their mobile phones. Therefore, customers can flexibly adjust according to their needs, choosing either a mechanical or electronic counting module without replacing the metering module, maximizing the user experience at minimal cost. Moreover, the counting module of this water meter is completely water-proof, unaffected by water outages in dry-type water meters, and the counting section is free of bubbles and mist, and will not be affected by poor water quality affecting the internal components. Furthermore, this water meter overcomes the limitations of existing technologies where volumetric metering modules are large, have complex and irregular lower shapes, and are difficult to assemble into cartridge-type water meters. The structure is designed to perfectly fit the volumetric metering module into the isolation mold, and compared to the cylindrical connector of existing structures, the annular connector is much shorter, thus not increasing the overall height of the isolation mold and the water meter. This ensures a reasonable product proportion, an aesthetically pleasing design, and avoids unnecessary material waste, giving it a promising market prospect.

[0013] The preferred detachable connection structure between the retaining ring and the inner wall of the isolation mold shell is that the inner wall of the lower opening of the isolation mold shell is provided with an internal thread, and the outer side of the retaining ring is provided with a corresponding external thread. The external thread of the retaining ring is screwed into the internal thread of the lower opening of the isolation mold shell. This structure is convenient and quick to disassemble, and the snap-fit ​​effect is firm and reliable. Moreover, the retaining ring is arranged on the lower outer edge of the metering module, so it does not obstruct the second water inlet inside. Therefore, as long as the integral upper module is inserted into the lower shell, the second water inlet is naturally connected to the annular cavity of the lower shell.

[0014] As a further preferred option, the lower edge of the metering module is provided with an inwardly tapered annular step surface, and the retaining ring is provided with an inwardly protruding annular rib. When the retaining ring is tightened with the lower opening of the isolation mold shell, the annular rib locks the annular step surface of the metering module. The inwardly protruding annular rib provides a good locking and fastening effect and also makes the structure more compact.

[0015] As a further optimization, the upper cover is also equipped with a remote transmission module; this allows the results of the counting module to be remotely sent to the receiving end of the user or meter reader, enabling remote meter reading and facilitating users to independently check and pay their bills via a mobile app.

[0016] As a further optimization, the upper surface of the lower convex ring is a lower conical surface with a higher inner surface and a lower outer surface, and the lower surface of the upper convex ring is an upper conical surface corresponding to the lower conical surface. In this way, the conical surface with a higher inner surface and a lower outer surface has a guiding effect, making the assembly process of the integrated upper ink cartridge module and the lower housing more convenient and precise. Moreover, after the upper and lower conical surfaces abut against each other, they can clamp the central sealing ring more tightly, further improving the sealing performance of the upper and lower convex ring assembly.

[0017] The preferred detachable connection structure between the lower opening of the upper cover and the outer wall of the isolation mold shell is that the inner wall of the lower opening of the upper cover is provided with multiple elastic buckles, and the outer wall of the isolation mold shell is provided with a ring of ribs. The elastic buckles of the lower opening of the upper cover are engaged with the ribs of the outer wall of the isolation mold shell. This connection structure is simple, but the engagement is firm and reliable.

[0018] As a further preferred option, the inner wall of the lower opening of the upper cover is provided with a downward-facing positioning buckle, and the outer wall of the isolation mold shell is provided with a positioning rib for engaging with the positioning buckle; in this way, when the elastic buckle of the upper cover engages with the protruding rib of the outer wall of the isolation mold shell, the positioning rib just engages with the positioning buckle, thereby achieving precise circumferential positioning of the upper cover and the isolation mold shell.

[0019] The preferred circumferential positioning structure between the counting module and the transverse partition is that the bottom shell of the counting module is provided with two positioning pins, and the upper surface of the transverse partition is provided with two positioning sleeves for engaging with the positioning pins; thus, the structure is simple, easy to manufacture, and the circumferential positioning effect is accurate. Attached Figure Description

[0020] Figure 1 This is a half-sectional view of the volumetric water meter with interchangeable metering modules according to this utility model.

[0021] Figure 2 It is Figure 1 A schematic diagram of the structure after replacing the mechanical head counting module with an electronic head counting module.

[0022] Figure 3 This is a structural schematic diagram of the volumetric water meter with interchangeable metering modules according to this utility model.

[0023] Figure 4 This is an exploded structural diagram of the volumetric water meter with interchangeable metering modules according to this utility model.

[0024] Figure 5 yes Figure 4 A schematic diagram of the structure after being deflected at a certain angle.

[0025] Figure 6 This is a schematic diagram of the upper cover of the volumetric water meter with interchangeable metering modules according to this utility model.

[0026] Figure 7 This is a schematic diagram of the structure of the volumetric water meter with interchangeable metering modules after the metering module and filter screen are separated.

[0027] Figure 8 This is a schematic diagram of the volumetric water meter with interchangeable metering modules of this utility model after removing the upper cover and meter glass and installing the mechanical head counting module.

[0028] Figure 9 This is a schematic diagram of the volumetric water meter with interchangeable metering modules of this utility model after removing the upper cover and meter glass and installing the electronic head counting module.

[0029] The diagram shows: 1. Lower casing, 2. First water pipe, 3. Second water pipe, 4. Inner liner, 5. Annular cavity, 6. Lower convex ring, 6.1. Lower conical surface, 7. Metering module, 7.1. First water inlet, 7.2. Second water inlet, 7.3. Annular baffle, 7.4. Arc-shaped part, 7.5. Annular stepped surface, 8. Counting module, 9. Isolation mold shell, 10. Upper convex ring, 10.1. Upper conical surface, 11. Clamp, 12. Snap ring, 12.1. Annular rib, 13. Filter screen, 14. Upper casing, 15. Elastic buckle, 16. Convex rib, 17. Positioning buckle, 18. Positioning rib, 19. Positioning pin, 20. Positioning sleeve, 21. Piston magnet seat, 22. Magnetized central gear, 23. Fixed disc, 24. Horizontal partition, 25. Annular connector, 26. Remote transmission module. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 1-9 As shown, this utility model discloses a volumetric water meter with interchangeable metering modules. It includes a movement and a permanent lower casing 1. "Permanent" means that the lower casing 1 only needs to be initially installed in the water supply network and can be used permanently. Since it does not require replacement, the lower casing 1 can be made of more expensive and better materials, making it more durable. The lower casing 1 is provided with a first water pipe 2 and a second water pipe 3. The bottom plate of the lower casing 1 has an upward-opening inner liner 4. The first water pipe 2 communicates with the inner liner 4 cavity through a side through-hole. The second water pipe 3 communicates with the annular cavity 5 of the lower casing 1. The upper opening of the lower casing 1 has a radially outward-protruding lower ring 6.

[0032] The mechanism includes a metering module 7 and a counting module 8. The metering module 7 includes a metering mold shell, which contains a hollow piston chamber. The piston chamber is equipped with a rotary piston, vertical partitions, and other components. The lower part of the metering mold shell has a first sprue 7.1, a second sprue 7.2, and an annular baffle 7.3 separating the two sprues. The hollow arc-shaped portion 7.4 on the side of the first sprue 7.1 protrudes from the annular baffle 7.3. The annular baffle 7.3 is not a regular ring because the arc-shaped portion 7.4 of the first sprue 7.1 protrudes from the side. Therefore, the annular baffle 7.3 is essentially a longitudinally extending closed baffle, roughly in the shape of a ring.

[0033] The metering module 7 is externally equipped with an isolation mold shell 9, and the lower part of the isolation mold shell 9 has a radially outwardly protruding upper ring 10. The upper ring 10 and the lower ring 6 of the lower casing 1 are detachably sealed and clamped by a clamp 11. The clamp 11 is formed by two semi-circular rings hinged together, that is, the right side of the left semi-circular ring and the left side of the right semi-circular ring are both provided with a bearing seat, and the bearing seats of the two are connected by a hinge shaft. The two non-hinged ends of the two semi-circular rings are provided with two locking blocks, which are fixed by locking bolts, and as is common knowledge, a lead seal is provided between the two locking blocks.

[0034] The contact surfaces of the upper convex ring 10 and the lower convex ring 6 can be flat arc surfaces, but preferably, the upper surface of the lower convex ring 6 is a lower conical surface 6.1 with a higher inner surface and a lower outer surface, and the lower surface of the upper convex ring 10 is an upper conical surface 10.1 corresponding to the lower conical surface 6.1.

[0035] The upper end of the isolation housing 9 is provided with a horizontal partition 24 for separating the counting module 8. In other words, the horizontal partition 24 completely separates the counting module 8 from the metering module 7, making the counting module 8 completely independent. Furthermore, the housing of the counting module 8 is a fully enclosed dry housing, which completely eliminates the possibility of water entering the counting module 8.

[0036] The lower end of the isolation mold 9 is open, and the cross-sectional area of ​​the lower opening is slightly larger than that of the metering module 7. The metering module 7 is inserted into the inner cavity of the isolation mold 9 through the lower opening. A retaining ring 12 is detachably connected to the inner wall of the isolation mold 9. The retaining ring 12 holds the metering module 7 in the isolation mold 9 and makes the metering module 7 abut against the lower surface of the transverse partition 24.

[0037] Preferably, the detachable connection structure between the retaining ring 12 and the inner wall of the isolation mold shell 9 is such that the inner wall of the lower opening of the isolation mold shell 9 has an internal thread, and the outer side of the retaining ring 12 has a corresponding external thread, with the external thread of the retaining ring 12 engaging with the internal thread of the lower opening of the isolation mold shell 9. Alternatively, a tension ring can be used, where the lower part of the metering module 7 has an inner groove, with most of the tension ring fitting into the inner groove, and the inner wall of the lower opening of the isolation mold shell 9 has an outer groove, with a small portion of the tension ring fitting into the outer groove, thus securing the metering module 7 and the isolation mold shell 9 together.

[0038] The above-mentioned snap-fit ​​structure can be further upgraded. The lower edge of the metering module 7 can also be provided with an inwardly tapered annular step surface 7.5, and the snap ring 12 is provided with an inwardly protruding annular rib 12.1. When the snap ring 12 is tightened with the lower opening of the isolation mold shell 9, the annular rib 12.1 snaps into the annular step surface 7.5 of the metering module 7.

[0039] Since the retaining ring 12 is located on the lower outer edge of the metering module 7, it will not block the internal second water inlet 7.2, nor will it prevent the second water inlet 7.2 from communicating with the annular cavity 5 of the lower casing 1.

[0040] The lower end of the annular baffle 7.3 of the metering module 7 is directly fixed with an annular connector 25, and the annular connector 25 is equipped with a filter screen 13; the lower end of the annular connector 25 is sealed and plugged into the upper opening of the inner liner 4; thereby realizing the water circuit connection between the inner liner 4 of the lower casing 1 and the first water inlet 7.1 of the metering module 7.

[0041] The counting module 8 is provided with an upper cover 14. The lower opening of the upper cover 14 is detachably connected to the outer wall of the isolation mold shell 9, and the upper cover 14 presses the counting module 8 onto the transverse partition 24. The counting module 8 and the transverse partition 24 are circumferentially positioned.

[0042] Preferably, the lower opening of the upper cover 14 is detachably connected to the outer wall of the isolation mold shell 9. The inner wall of the lower opening of the upper cover 14 is provided with multiple elastic buckles 15, and the outer wall of the isolation mold shell 9 is provided with a ring of raised ribs 16. The elastic buckles 15 of the lower opening of the upper cover 14 engage with the raised ribs 16 of the outer wall of the isolation mold shell 9. Alternatively, the raised ribs can be located on the inner wall of the lower opening of the upper cover 14, and the elastic buckles can be located on the outer wall of the isolation mold shell 9, achieving the same elastic engagement between the lower opening of the upper cover 14 and the outer wall of the isolation mold shell 9. Or, an internal thread can be provided on the inner wall of the lower opening of the upper cover 14, and an external thread on the outer wall of the isolation mold shell 9. The lower opening of the upper cover 14 and the outer wall of the isolation mold shell 9 can be threaded together, achieving a detachable connection between the lower opening of the upper cover 14 and the outer wall of the isolation mold shell 9, and allowing the upper cover 14 to press the counting module 8 onto the transverse partition 24.

[0043] Of course, when the lower opening of the upper cover 14 is elastically engaged with the outer wall of the isolation mold 9, a downward-facing positioning buckle 17 is provided on the inner wall of the lower opening of the upper cover 14, and a positioning rib 18 is provided on the outer wall of the isolation mold 9 for engaging with the positioning buckle 17. The positioning buckle 17 and the positioning rib 18 are engaged with each other to achieve circumferential positioning of the upper cover 14 and the isolation mold 9.

[0044] Furthermore, as is common sense, there is a lead seal between the lower opening of the upper cover 14 and the outer wall of the isolation mold 9 that can only be opened by staff. For example, lead seal holes can be drilled at the lower opening of the upper cover 14 and the protruding rib 16 of the isolation mold 9, and a lead seal rope can be used to pass through the two lead seal holes.

[0045] The preferred structure for circumferential positioning of the counting module 8 and the transverse partition 24 is as follows: the bottom shell of the counting module 8 is provided with two positioning pins 19, and the upper surface of the transverse partition 24 is provided with two positioning sleeves 20 for engaging with the positioning pins 19. The two positioning pins 19 and the two positioning sleeves 20 correspond one-to-one. When the upper cover 14 presses the counting module 8 onto the transverse partition 24, each positioning pin 19 is inserted into the corresponding positioning sleeve 20. In addition, various other forms of circumferential positioning devices can be used between the two, such as a protrusion on the bottom shell of the counting module 8, a recess on the upper surface of the transverse partition 24, and a male-female mating between the protrusion and the recess, etc.

[0046] To enhance remote meter reading capabilities, a remote transmission module 26 can be installed on the upper meter cover 14.

[0047] The counting module 8 and the metering module 7 are connected by a magnetic coupling structure, transmitting the number of revolutions through a partition 24. Specifically, the metering module 7 has a piston magnet seat 21 on its upper part, which is linked to the piston to output the number of piston rotations. The mechanical head's counting module 8 has a magnetic center gear 22 at its lower part, which meshes with the next-stage transmission gear of the counting module 8 to trigger counting; the electronic head's counting module 8 has a fixed disk 23 at its lower part, which has a bipolar magnetoresistive sensor that can sense changes in the N and S poles to trigger counting.

Claims

1. A volumetric water meter with interchangeable metering modules, comprising a movement and a permanent lower casing. The movement includes a metering module and a counting module. The metering module includes a first water inlet, a second water inlet, and an annular baffle separating the two water inlets. The lower casing has a first water pipe and a second water pipe. The bottom plate of the lower casing has an upward-opening inner liner. The first water pipe communicates with the inner liner cavity through a side through-hole. The second water pipe communicates with the annular cavity of the lower casing. The upper opening of the lower casing has a lower convex ring. An isolation mold is provided outside the metering module. An upper convex ring is provided at the bottom of the isolation mold. The upper convex ring and the lower convex ring of the lower casing are detachably sealed and fastened by a clamp. Its features are: The upper end of the isolation mold shell is provided with a horizontal partition for separating the counting modules, and the lower end of the isolation mold shell is open; the counting module is provided with an upper cover, the lower opening of the upper cover is detachably connected to the outer wall of the isolation mold shell, and the upper cover presses the counting module on the horizontal partition, and the counting module is circumferentially positioned with the horizontal partition; the counting module and the metering module are connected by magnetic coupling. The metering module has an annular connector fixed at the lower end of the annular baffle, and the annular connector is equipped with a filter screen; the inner wall of the isolation mold shell is detachably connected with a retaining ring, which holds the metering module in the isolation mold shell, and the annular connector is sealed and plugged into the upper opening of the inner liner.

2. The volumetric water meter with interchangeable metering modules according to claim 1, characterized in that: The inner wall of the lower opening of the isolation mold shell is provided with an internal thread, and the outer side of the retaining ring is provided with a corresponding external thread. The external thread of the retaining ring is screwed into the internal thread of the lower opening of the isolation mold shell.

3. The volumetric water meter with interchangeable metering modules according to claim 2, characterized in that: The lower edge of the metering module has an inwardly tapered annular step surface, and the retaining ring has an inwardly protruding annular rib. When the retaining ring is tightened with the lower opening of the isolation mold shell, the annular rib locks the annular step surface of the metering module.

4. The volumetric water meter with interchangeable metering modules according to claim 1, characterized in that: The upper cover is also equipped with a remote transmission module.

5. The volumetric water meter with interchangeable metering modules according to claim 1, characterized in that: The upper surface of the lower convex ring is a lower conical surface that is higher on the inside and lower on the outside, while the lower surface of the upper convex ring is an upper conical surface that corresponds to the lower conical surface.

6. The volumetric water meter with interchangeable metering modules according to claim 1, characterized in that: The inner wall of the lower opening of the upper cover is provided with multiple elastic buckles, and the outer wall of the isolation mold shell is provided with a ring of raised ribs. The elastic buckles of the lower opening of the upper cover are engaged with the raised ribs of the outer wall of the isolation mold shell.

7. The volumetric water meter with interchangeable metering modules according to claim 6, characterized in that: The inner wall of the lower opening of the upper cover is provided with a downward-facing positioning buckle, and the outer wall of the isolation mold shell is provided with positioning ribs for engaging with the positioning buckle.

8. The volumetric water meter with interchangeable metering modules according to claim 1, characterized in that: The bottom shell of the counting module is provided with two positioning pins, and the upper surface of the transverse partition is provided with two positioning sleeves for engaging with the positioning pins.

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