Water meter vacuum counter

Abstract

The utility model discloses a water meter vacuum counter, relates to the technical field of water meter movement, and aims to solve the problem that the water-proof, moisture-proof and mildew-proof vacuum of a water meter electronic part is difficult to maintain for a long time, the water meter vacuum counter comprises a gear box assembly provided with a magnetic shielding ring groove and a bearing hole, a magnetic shielding ring is connected in the magnetic shielding ring groove, and a bearing is connected in the bearing hole; a meter glass assembly comprising meter glass is connected to the upper portion of a gear box of the gear box assembly, a sealing cavity is formed in the meter glass and the gear box, a gear train and an electromechanical transformation unit are arranged in the sealing cavity, a holder is connected to the upper portion of the gear box, and the gear train and the electromechanical transformation unit are arranged in the holder. The water meter vacuum counter is suitable for dry type water meter magnetic steel transmission, an electronic part can be sealed in a vacuum mode, vacuumizing and follow-up maintenance are simple, and vacuum is convenient to keep.

Description

Technical Field

[0001] The utility model relates to the technical field of water meter movement, and particularly relates to a water meter vacuum counter. Background Art

[0002] The intellectualization of water meters has facilitated people's lives. However, the operating conditions of water meters are harsh, and electronic functions often malfunction due to water ingress, moisture, or mildew. Therefore, many water meter manufacturers are committed to the design of waterproof, moisture-proof, and mildew-proof for the electronic part, including mechanical seals using sealing rings, adding desiccants during mechanical seals, potting using sealants, and maintaining vacuum. Among them, vacuum sealing is the most ideal solution for water meter electronic sealing, but this solution has strict requirements for vacuum-holding materials, generally metal materials with close molecules and atoms, inorganic materials such as glass ceramics, etc. In addition, the current vacuum-holding solutions on the market are divided into two types: screw or thread fastening and metal deformation clamp pressing. The former requires a large structural space, and the latter requires special equipment for forming and is difficult to disassemble and repair later.

[0003] For example, there is a Chinese patent with the publication number CN203587165U, which relates to a dry-type water meter, including an impeller box, an impeller, a gear box, a runner, and a counter; multiple arc-shaped edges evenly distributed in a circle are provided on the edge of the open end of the impeller box, and a circular boss that engages with the arc-shaped edges is provided at the bottom of the gear box; a top column is provided at the center of the outer bottom of the gear box; the impeller is installed in the cavity formed by the bottom of the gear box and the impeller box, and the bushing at the bottom of the impeller is sleeved on the tip at the center of the impeller box; the runner is magnetically coupled with the impeller, and both the runner and the counter are arranged in the gear box, and the runner meshes with one of the reduction gears of the counter; an agate bushing is provided in the top column of the gear box, and the thimble of the impeller is inserted into the central hole of the agate bushing; the advantage is that an agate bushing is provided in the top column of the gear box, and the thimble of the impeller is inserted into the central hole of the agate bushing. The agate is soft and smooth, with little friction with the thimble, reducing the friction force to be overcome, and thus reducing the momentum, thereby improving the sensitivity of the dry-type water meter; however, the sealing method of the Chinese patent with the publication number CN203587165U is single, and it is prone to sealing failure problems as the use time increases, and vacuum sealing cannot be achieved. Summary of the Utility Model

[0004] In order to solve the problem that it is difficult to maintain the vacuum waterproof, moisture-proof, and mildew-proof of the electronic part of the water meter for a long time, the utility model proposes a water meter vacuum counter, which is applicable to the magnetic steel drive of dry-type water meters. The electronic part can be vacuum-sealed, the vacuum pumping and subsequent maintenance are simple, and the vacuum holding is convenient.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: a water meter vacuum counter,

[0006] It includes a gear box assembly provided with a magnetic shielding ring groove and a bearing hole, a magnetic shielding ring is connected in the magnetic shielding ring groove, and a bearing is connected in the bearing hole; above the gear box of the gear box assembly, a watch glass assembly including a watch glass is connected, a sealing cavity is formed between the watch glass and the interior of the gear box, a gear train and an electromechanical conversion unit are arranged in the sealing cavity, and a cage is connected above the gear box.

[0007] In this technical solution, the water meter vacuum counter is vacuum-sealed and maintains durability. The electronic part has a long service life and is adhesiveless, clean and tidy, which is convenient for subsequent maintenance and reuse; the cage can be snap-fitted onto the vacuum counter as needed, and the installation and disassembly are convenient, and the cage can be recycled; the gear box can be installed with a high magnetic shielding ring, and one magnetic shielding ring can achieve magnetic field protection for the upper and lower magnetic steels of the coupling to prevent external magnetic interference; the gear box assembly, the watch glass assembly, the gear train and the electromechanical conversion unit are all modular, generalized and serialized designs, which are convenient for production, inventory scheduling, reuse, upgrade and maintenance, as well as disassembly, recycling and treatment after product abandonment.

[0008] The present utility model is further provided as follows: the gear box has a bearing bushing hole, a bearing bushing is arranged in the bearing bushing hole, the bearing hole and the bearing bushing hole are respectively configured to be connected to a hollow cylindrical structure extending upward and downward from the center of the bottom of the gear box, the diameter of the bearing bushing hole is larger than the diameter of the bearing hole, and both the bearing hole and the bearing bushing hole are provided with an opening section whose thickness gradually thins towards the outer peripheral side.

[0009] In this technical solution, the material of the gear box is a thermosetting plastic with high strength and sufficient rigidity, which can not only retain the magnetic permeability of the magnetic steel coupling and prevent the penetration of water vapor molecules, but also withstand the water supply pressure without damage; a hollow cylindrical bearing hole extends upward from the center of the bottom of the gear box, a hollow cylindrical bearing bushing hole extends downward from the center of the bottom of the gear box, the diameter of the bearing bushing hole is larger than the diameter of the bearing hole, both the bearing hole and the bearing bushing hole are provided with an opening section whose thickness gradually thins towards the outer peripheral side, and a bearing bushing is connected in the bearing bushing hole.

[0010] The present utility model is further provided as follows: the gear box is a first stepped shaft structure, a first plane is formed at the shaft shoulder of the first stepped shaft, the sealing cavity is a second stepped shaft structure, the gear box is successively provided with a watch glass limiting platform and a gear train limiting platform from top to bottom at the shaft shoulder of the second stepped shaft, an annular groove is provided on the watch glass limiting platform, and a sealing ring is placed in the annular groove.

[0011] In this technical solution, the gear box and the sealing cavity are of different stepped shaft shapes. The gear box is a hollow first stepped shaft structure, and the sealing cavity is a second stepped shaft. The gear box is set as a stepped shaft to facilitate connection and fixation with other structures outside the gear box. A first plane is formed at the shoulder of the first stepped shaft, and the hook of the cage is clamped below the first plane.

[0012] The sealing cavity arranged inside the gear box is in the shape of a stepped shaft, that is, the inner wall of the gear box is in the shape of a stepped shaft. The gear box is successively provided with a watch glass limiting platform and a gear train limiting platform from top to bottom at the shoulder of the second stepped shaft, which can play a limiting role on the watch glass and the gear train. An annular groove is provided on the watch glass limiting platform, and a sealing ring is placed in the annular groove, which can make the connection between the watch glass and the gear box closer, form a completely sealed sealing cavity, and facilitate subsequent evacuation of the counter.

[0013] The present utility model is further set as follows: The watch glass includes a first surface and a second surface opposite to the first surface. The second surface is located on the side close to the sealing cavity. The watch glass is provided with a through hole extending from the first surface to the second surface. A sealing washer is connected to the first surface on the circumference of the through hole, and a handle cap is connected to the second surface on the circumference of the through hole. A wire threading plastic part is connected in the through hole.

[0014] In this technical solution, the watch glass is made of transparent glass material, including a first surface and a second surface opposite to the first surface. The first surface is the upper surface, and the second surface is the lower surface. The watch glass is provided with a through hole that can accommodate the wire threading plastic part to pass through. A sealing washer is connected to the upper surface of the watch glass on the circumference of the through hole to seal the through hole and ensure the sealing performance of the sealing cavity. A handle cap is connected to the lower surface of the watch glass on the circumference of the through hole. The handle cap is threadedly connected or ultrasonically welded to the wire threading plastic part to ensure that the sealing washer deforms under force and remains. The combination of the wire threading plastic part and the glass has been pre-tested for airtightness to ensure the success rate of vacuum retention.

[0015] The present utility model is further set as follows: The wire threading plastic part includes a pin connected to the socket of the electromechanical conversion unit. One end of the pin close to the first surface is connected to one end of a communication wire, and the other end of the communication wire is connected to a plug-in seat. The plug-in seat is connected to the cage, and a sealing retaining ring is connected to the outer circumference of the end of the wire threading plastic part extending out of the first plane.

[0016] In this technical solution, the wire threading plastic part is an integrated structural part that uses plastic to coat the communication wire, the plug-in seat and the pin. To ensure the sealing performance of the wire threading plastic part, all the welding joints of the communication wires are first glued and then welded to the plug-in seat and the pin respectively, and the welding parts are fully wrapped by plastic.

[0017] The pin can be inserted into the socket on the electromechanical conversion unit to achieve electrical connection with the electromechanical conversion unit. One end of the communication line is connected to the top of the pin, and the other end of the communication line is connected to a pluggable socket. The other end of the pluggable socket can be fixed at the connecting part of the large rounded surface of the cage.

[0018] A sealing ring is connected to the outer peripheral side of one end of the wire-passing plastic part extending out of the first plane to fix the wire-passing plastic part and the sealing washer to ensure the sealing performance.

[0019] The present utility model is further configured as follows: the cage has a rounded square top surface, the edge of the top surface extends vertically downward to form a side surface, the side surface includes three small rounded surfaces and a large rounded surface, straight-edge surfaces are connected between the four rounded surfaces, a circular opening is provided in the center of the top surface, and four fan-shaped straight die openings concentric with the circular opening are provided at the four corners of the top surface outside the circular opening.

[0020] In this technical solution, the cage is made of high-elastic engineering plastic, including a rounded square top surface, the edge of the top surface extends vertically downward to form a side surface, the side surface includes three small rounded surfaces and a large rounded surface, straight-edge surfaces are connected between the four rounded surfaces, a circular opening is provided in the center of the top surface, through which the inside of the gear box can be seen through the watch glass, and four fan-shaped straight die openings concentric with the circular opening are provided at the four corners of the top surface outside the circular opening. By using the preset straight die openings, there is no need for lateral sliding die to form hooks, and the mold life is simple and long; the design of the straight-edge surface facilitates the fixation of the counter packaging and transportation, and the space left by the large rounded surface is convenient for placing the communication long wire and the pluggable socket.

[0021] The present utility model is further configured as follows: a bent first elastic member and a horizontal second elastic member are formed by the downward depression of the top surface between the straight die opening and the circular opening. The lower surface of the second elastic member abuts against the upper surface of the watch glass. A hook extending downward from the outer diameter of the straight die opening is provided on the top surface, and a connecting part is provided at the edge of the large rounded surface.

[0022] In this technical solution, a bent first elastic member and a horizontal second elastic member are formed by the downward depression of the top surface between the straight die opening and the circular opening. The second elastic member abuts against the upper surface of the watch glass and presses the watch glass downward. A hook extending downward from the outer diameter of the straight die opening is provided on the top surface, and the hook is stuck on the first plane of the gear box and abuts against the gear box upward to tightly fix the watch glass and the gear box together to form a sealed cavity; a connecting part is provided at the edge of the large rounded surface, and the connecting part can fix the pluggable socket of the wire-passing plastic part. The continuous elastic pressing plane is not prone to permanent deformation or breakage while maintaining the elastic pressure, and is easy to naturally recover during non-assembly.

[0023] The present utility model is further configured as follows: the gear train is fixed by the positioning posts of the gear box, and the gear train has a coupling gear that abuts against the top surface of the bearing.

[0024] In this technical solution, a positioning post is provided inside the gear box to fix the gear train. The gear train includes a coupling gear. When the gear train is properly placed in the gear box, the coupling gear of the gear train abuts against the top of the bearing.

[0025] The present utility model is further configured as: a sealing and dismounting opening is provided at the upper edge of the gear box, and a positioning boss is connected to the outer wall of the gear box directly below the sealing and dismounting opening. The positioning boss is located below the first plane.

[0026] In this technical solution, a sealing and dismounting opening is provided at the upper edge of the gear box. Only a common tool such as a flat-head screwdriver can be used to pry open the watch glass and take out the electronic part, which is convenient for installation and disassembly. A positioning boss is connected to the outer wall of the gear box directly below the sealing and dismounting opening. The positioning boss is located below the first plane. When the gear box is installed in the watch case, the positioning boss can play a positioning role to ensure the correct orientation of the circumference of the counter plane.

[0027] The present utility model is further configured as: a plurality of reinforcing ribs are provided on the inner bottom surface of the gear box, and the reinforcing ribs are distributed in a circular pattern.

[0028] In this technical solution, the reinforcing ribs can enhance the water pressure resistance of the gear box under the condition of limited wall thickness.

[0029] The beneficial effects of the present utility model are as follows:

[0030] 1. Vacuum sealing and maintaining durability. The electronic part has a long service life, no glue bonding, is clean and tidy, and is convenient for subsequent maintenance and reuse.

[0031] 2. The gear box is provided with a vacuum sealing and dismounting opening. Only a common tool such as a flat-head screwdriver can be used to pry open the watch glass and take out the electronic part.

[0032] 3. The material of the gear box is a thermosetting plastic with high strength and sufficient rigidity, which can not only retain the magnetic permeability of the magnetic steel coupling and prevent the penetration of water vapor molecules, but also withstand the water supply pressure without damage.

[0033] 4. The cage can be assembled to the vacuum counter in a snap-fit manner according to needs, which is convenient for installation and disassembly, and enables the cage to be recycled.

[0034] 5. The continuous first elastic member is not easily permanently deformed or broken while maintaining elastic pressure, and is easy to naturally recover during assembly.

[0035] 6. The preset straight die opening eliminates the need for side sliding die to form hooks, and the die has a simple structure and a long service life.

[0036] 7. The straight-edge surface design facilitates the fixation of the counter during packaging and transportation, and the space left by the large rounded surface is convenient for placing communication long wires and plug-in sockets.

[0037] 8. The combination of the wire-passing plastic part and the glass is pre-tested for airtightness to ensure the success rate of vacuum maintenance;

[0038] 9. The gear box can be installed with a high magnetic shielding ring. One magnetic shielding ring can achieve magnetic field protection for the upper and lower magnetic steels of the coupling, preventing external magnetic interference;

[0039] 10. The gear box assembly, the watch glass assembly, the gear train and the electromechanical conversion unit are all designed in a modular, general and serialized manner, which is convenient for production stock scheduling, reuse, upgrading, maintenance, and disassembly, recycling and treatment after product abandonment. Description of the Drawings

[0040] Figure 1 is a cross-sectional view of the present invention.

[0041] Figure 2 is a full cross-sectional view of the gear box of the present invention.

[0042] Figure 3 is a schematic semi-sectional view of the gear box of the present invention.

[0043] Figure 4 is a partial cross-sectional view of the watch glass assembly of the present invention.

[0044] Figure 5 is a schematic view of the cage of the present invention.

[0045] Reference Numerals: Gear box assembly 1; Gear box 1-1; Magnetic shielding ring groove 1-1-1; Bearing hole 1-1-2; Bearing bushing hole 1-1-3; Gear train limiting platform 1-1-4; Annular groove 1-1-5; Positioning post 1-1-6; Watch glass limiting platform 1-1-7; First plane 1-1-8; Sealing disassembly port 1-1-9; Positioning boss 1-1-10; Reinforcing rib 1-1-11; Magnetic shielding ring 1-2; Bearing bushing 1-3; Bearing 1-4; Watch glass assembly 2; Watch glass 2-1; Through hole 2-1-1; Wire-passing plastic part 2-2; Communication wire 2-2-1; Plug-in seat 2-2-2; Pin 2-2-3; Sealing retaining ring 2-3; Sealing washer 2-4; Handle cap 2-5; Gear train 3; Coupling gear 3-1; Electromechanical conversion unit 4; Sealing ring 5; Cage 6; Hook 6-1; First elastic member 6-2; Second elastic member 6-3; Large rounded surface 6-4; Small rounded surface 6-5; Straight edge surface 6-6; Straight die orifice 6-7. Detailed Embodiments

[0046] To make the objectives, technical solutions, and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific implementation manners described herein are only the best embodiments of the present utility model, which are only used to explain the present utility model and do not limit the protection scope of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0047] There are the following four solutions for the waterproof, moisture-proof, and mildew-proof of the electronic part of the existing water meters.

[0048] Mechanical seal using a sealing ring: A single mechanical seal will encapsulate air with water vapor during production. Therefore, during continuous heating and cooling cycles, condensed water accumulates at the electronic components, corroding the circuit board pads and the solder feet of the electronic components, ultimately causing the electronic part to malfunction.

[0049] Adding a desiccant during mechanical seal: In the desiccant solution, the desiccant will repeatedly absorb and release water vapor in a closed space, thus losing its original dehumidification function.

[0050] The moisture-proof and mildew-proof ability of the potting seal with a soft sealant is poor. Generally, a certain thickness is required, which has a restrictive requirement on the size of the water meter; while using a hard sealant, the stress pull during thermal expansion and contraction causes the electronic components to have false soldering and desoldering.

[0051] Vacuum holding: Vacuum sealing is the most ideal solution for the electronic seal of water meters.

[0052] The existing vacuum holding solutions are divided into two types: screw or thread fastening holding and metal deformation clamp pressing. Both have certain deficiencies. The former requires a large structural space, and the latter requires special equipment for forming and is difficult to disassemble and repair subsequently.

[0053] Embodiment 1

[0054] This embodiment provides a water meter vacuum counter, which includes a vacuum counter and a retaining frame.

[0055] The vacuum counter is a counter for a dry movement of a water meter, mainly including a gear box assembly 1, a watch glass assembly 2, a gear train 3, an electromechanical conversion unit 4, and a sealing ring 5.

[0056] The gear box assembly includes a gear box 1-1, a magnetic shielding ring 1-2, a bearing bushing 1-3, and a bearing 1-4.

[0057] The gear box is provided with a magnetic shielding ring groove 1-1-1, a bearing hole 1-1-2, a bearing bushing hole 1-1-3, a gear train limiter 1-1-4, an annular groove 1-1-5, a positioning column 1-1-6, a watch glass limiter 1-1-7, a first plane 1-1-8, a seal disassembly port 1-1-9, a positioning boss 1-1-10 and a reinforcing rib 1-1-11. The positioning boss is to cooperate with the watch case to ensure the determined orientation of the counter plane circumference. The reinforcing rib is to enhance the water pressure resistance of the gear box under the condition of limited wall thickness.

[0058] The watch glass assembly includes a watch glass 2-1, a threading plastic part 2-2, a sealing gasket 2-3, a sealing retaining ring 2-4 and a handle cap 2-5.

[0059] The watch glass is provided with a through hole. In order to prevent the edge from breaking when processing the through hole, blind holes should be processed at both ends of the through hole respectively until it is opened.

[0060] The threading plastic part is an integrated structural part that plastic covers the communication line 2-2-1, the plug socket 2-2-2, and the plug pin 2-2-3. To ensure the sealing of the threading plastic part, all the communication line welding heads are first glued and then welded to the plug socket and the plug pin respectively, and the welding parts are fully wrapped by plastic. As a preference, the outer sheath material of the communication line core is the same as the coating plastic.

[0061] The handle cap is threadedly connected or ultrasonically welded to the threading plastic part to ensure that the sealing gasket is deformed and maintained under stress.

[0062] The gear train is a universal dry-type gear train for a movement, that is, it includes gears with coupled magnets.

[0063] The electromechanical conversion unit includes a circuit board and its electronic components, a digital wheel, a four-eight tooth wheel, a wheel shaft, a turbine and a plastic packaging shell. The sealing ring is an O-ring, which is a standard part.

[0064] The retainer is made of high elastic engineering plastics and is provided with a hook 6-1, a first elastic member 6-2, a second elastic member 6-3, a large fillet surface 6-4, a small fillet surface 6-5, a straight edge surface 6-6 and a straight die mouth 6-7.

[0065] A water meter vacuum counter of the present embodiment includes a gear box assembly provided with a magnetic shielding ring groove and a bearing hole, wherein a magnetic shielding ring is connected in the magnetic shielding ring groove, and a bearing is connected in the bearing hole; a watch glass assembly including a watch glass is connected above the gear box of the gear box assembly, a sealed cavity is formed between the watch glass and the interior of the gear box, a gear train and an electromechanical conversion unit are provided in the sealed cavity, and a retaining frame is connected above the gear box.

[0066] In this embodiment, the water meter vacuum counter is vacuum-sealed and durable. The electronic part has a long service life, is adhesiveless, clean and tidy, facilitating subsequent maintenance and reuse. The cage can be snap-fitted onto the vacuum counter as needed, with convenient installation and disassembly, and enables the cage to be recycled. The gear box can be installed with a high magnetic shielding ring, and one magnetic shielding ring can achieve magnetic field protection for the upper and lower magnetic steels of the coupling, preventing external magnetic interference. The gear box assembly, the watch glass assembly, the gear train, and the electromechanical conversion unit are all modular, generalized, and serialized in design, facilitating production, inventory scheduling, reuse, upgrade and maintenance, as well as disassembly, recycling, and disposal after product abandonment.

[0067] The gear box is provided with a bearing bushing hole, and a bearing bushing is arranged in the bearing bushing hole. The bearing hole and the bearing bushing hole are respectively configured to be connected to a hollow cylindrical structure extending upward and downward from the center of the bottom of the gear box. The diameter of the bearing bushing hole is larger than the diameter of the bearing hole. Both the bearing hole and the bearing bushing hole are provided with an opening section whose thickness gradually thins towards the outer peripheral side.

[0068] In this embodiment, the material of the gear box is a thermosetting plastic with high strength and sufficient rigidity, which can not only retain the magnetic permeability of the magnetic steel coupling, prevent the penetration of water vapor molecules, but also withstand the water supply pressure without damage. A bearing hole in the form of a hollow cylindrical structure extends upward from the center of the bottom of the gear box, and a bearing bushing hole in the form of a hollow cylindrical structure extends downward from the center of the bottom of the gear box. The diameter of the bearing bushing hole is larger than the diameter of the bearing hole. Both the bearing hole and the bearing bushing hole are provided with an opening section whose thickness gradually thins towards the outer peripheral side, and a bearing bushing is connected in the bearing bushing hole.

[0069] The gear box is a first stepped shaft structure. A first plane is formed at the shoulder of the first stepped shaft. The sealing cavity is a second stepped shaft. The gear box is sequentially provided with a watch glass limiting platform and a gear train limiting platform from top to bottom at the shoulder of the second stepped shaft. An annular groove is provided on the watch glass limiting platform, and a sealing ring is placed in the annular groove.

[0070] In this embodiment, the gear box and the sealing cavity are of different stepped shaft shapes. The gear box is a hollow first stepped shaft structure, and the sealing cavity is a second stepped shaft. The gear box is arranged in a stepped shaft shape to facilitate connection and fixation with other structures outside the gear box. A first plane is formed at the shoulder of the first stepped shaft, and the hook of the cage is clamped below the first plane.

[0071] The sealing cavity arranged inside the gear box is in the shape of a stepped shaft, that is, the inner wall of the gear box is in the shape of a stepped shaft. The gear box is sequentially provided with a watch glass limiting platform and a gear train limiting platform from top to bottom at the shoulder of the second stepped shaft, which can play a limiting role for the watch glass and the gear train. An annular groove is provided on the watch glass limiting platform, and a sealing ring is placed in the annular groove, which can make the connection between the watch glass and the gear box closer, form a completely sealed cavity, and facilitate subsequent vacuum pumping of the counter.

[0072] The watch glass includes a first surface and a second surface opposite to the first surface. The second surface is located on the side close to the sealing cavity. The watch glass is provided with a through hole extending from the first surface to the second surface. A sealing gasket is connected to the first surface on the periphery of the through hole, a handle cap is connected to the second surface on the periphery of the through hole, and a wire threading plastic part is connected inside the through hole.

[0073] In this embodiment, the watch glass is made of transparent glass material and includes a first surface and a second surface opposite to the first surface. The first surface is the upper surface and the second surface is the lower surface. The watch glass is provided with a through hole that can accommodate the wire threading plastic part to pass through. A sealing gasket is connected to the upper surface of the watch glass on the periphery of the through hole to seal the through hole and ensure the sealing performance of the sealing cavity. A handle cap is connected to the lower surface of the watch glass on the periphery of the through hole. The handle cap is threadedly connected or ultrasonically welded to the wire threading plastic part to ensure that the sealing gasket deforms under force and remains in place. The combination of the wire threading plastic part and the glass is pre-tested for airtightness to ensure the success rate of vacuum retention.

[0074] The wire threading plastic part includes a pin connected to the socket of the electromechanical conversion unit. One end of the pin close to the first surface is connected to one end of a communication wire, and the other end of the communication wire is connected to a plug and socket. The plug and socket is connected to a cage, and a sealing retaining ring is connected to the outer peripheral side of one end of the wire threading plastic part extending out of the first plane.

[0075] In this embodiment, the wire threading plastic part is an integrated structural part with a communication wire, a plug and socket, and a pin wrapped with plastic. To ensure the airtightness of the wire threading plastic part, all the communication wire welding joints are first spot-welded and then welded to the plug and socket and the pin respectively, and the welding parts are fully wrapped with plastic.

[0076] The pin can be inserted into the socket on the electromechanical conversion unit to achieve electrical connection with the electromechanical conversion unit. One end of the communication wire is connected to the top of the pin, and the other end of the communication wire is connected to a plug and socket. The other end of the plug and socket can be fixed at the connecting part of the large rounded corner surface of the cage.

[0077] A sealing retaining ring is connected to the outer peripheral side of one end of the wire threading plastic part extending out of the first plane to fix the wire threading plastic part and the sealing gasket and ensure the airtightness.

[0078] The cage has a rounded square top surface. The edge of the top surface extends vertically downward to form a side surface. The side surface includes three small rounded corner surfaces and a large rounded corner surface. Straight edge surfaces are connected between the four rounded corner surfaces. A circular opening is provided in the center of the top surface, and four fan-shaped straight die openings concentric with the circular opening are provided at the four corner directions on the top surface outside the circular opening.

[0079] In this embodiment, the cage is made of a high-elastic engineering plastic, including a rounded square top surface. The edge of the top surface extends vertically downward to form a side surface. The side surface includes three small rounded surfaces and a large rounded surface. Straight-edge surfaces are connected between the four rounded surfaces. A circular opening is provided in the center of the top surface, through which the inside of the gear box can be seen through the watch glass. Four fan-shaped straight die openings concentric with the circular opening are provided at the four corners of the top surface outside the circular opening. Using the preset straight die openings, hooks can be formed without lateral sliding die, and the mold life is simple and long; the design of the straight-edge surface facilitates the fixing of the counter packaging and transportation, and the space left by the large rounded surface is convenient for placing the communication long wire and the plug-in socket.

[0080] The top surface between the straight die opening and the circular opening is recessed downward to form a bent first elastic member and a horizontal second elastic member. The lower surface of the second elastic member abuts against the upper surface of the watch glass. A hook extending downward from the outer diameter of the straight die opening is provided on the top surface, and a connecting member is provided at the edge of the large rounded surface.

[0081] In this embodiment, the top surface between the straight die opening and the circular opening is recessed downward to form a bent first elastic member and a horizontal second elastic member. The second elastic member abuts against the upper surface of the watch glass and presses the watch glass downward. A hook extending downward from the outer diameter of the straight die opening is provided on the top surface. The hook is stuck on the first plane of the gear box and abuts against the gear box upward, tightly fixing the watch glass and the gear box together to form a sealed cavity; a connecting member is provided at the edge of the large rounded surface, and the connecting member can fix the plug-in socket of the wire-passing plastic part. The continuous elastic pressing plane is not easy to undergo permanent deformation or break while maintaining the elastic pressure, and is easy to naturally recover during non-assembly.

[0082] The gear train is fixed by the positioning posts of the gear box, and the gear train has a coupling gear that abuts against the top surface of the bearing.

[0083] In this embodiment, positioning posts are provided inside the gear box to fix the gear train. The gear train includes a coupling gear. When the gear train is properly placed in the gear box, the coupling gear of the gear train abuts against the top of the bearing.

[0084] A sealed disassembly opening is provided at the upper edge of the gear box, and a positioning boss is connected to the outer wall of the gear box directly below the sealed disassembly opening. The positioning boss is located below the first plane.

[0085] In this embodiment, a sealed disassembly opening is provided at the upper edge of the gear box. Only a common tool such as a flat-head screwdriver can be used to pry open the watch glass to take out the electronic part, which is convenient for installation and disassembly; a positioning boss is connected to the outer wall of the gear box directly below the sealed disassembly opening. The positioning boss is located below the first plane. When the gear box is installed in the watch case, the positioning boss can play a positioning role to ensure the correct orientation of the circumference of the counter plane.

[0086] The inner bottom surface of the gear box is provided with a plurality of reinforcing ribs, and the reinforcing ribs are circumferentially distributed.

[0087] In this embodiment, the reinforcing ribs can enhance the water pressure resistance of the gear box under the condition of limited wall thickness.

[0088] The installation process of a water meter vacuum counter in this embodiment is elaborated in detail below.

[0089] As Figure 1 shown, first, the bearings 1-4 are respectively installed into the bearing holes 1-1-2 and the bearing bushing holes 1-1-3, then the bearing bushing 1-3 is pressed into the bearing bushing hole 1-1-3, and finally the magnetic shielding ring 1-2 is snapped into the magnetic shielding ring groove 1-1-1 to assemble the gear box assembly.

[0090] As Figure 4 shown, the pin 2-2-3 end of the wire-passing plastic part 2-2 is sequentially passed through the sealing ring 2-3, the sealing washer 2-4 and the watch glass through hole 2-1-1, and is tightened with the handle cap 2-5 or ultrasonically welded firmly to form the watch glass assembly 2.

[0091] As Figure 2 shown, during assembly, align the gear train positioning posts 1-1-6. First, place the gear train 3 and the electromechanical conversion unit 4 on the gear train limiting platform 1-1-4. At this time, the tip of the coupling gear 3-1 of the gear train should abut against the surface of the bearing 1-4. Press down on the gear train 3 and shake the gear box 1-1, and the coupling gear 3-1 has a wobble. Then place the sealing ring 5 in the annular groove 1-1-5, align the pin 2-2-3 of the watch glass assembly 2 with the socket on the electromechanical conversion unit 4 and snap it in until the lower plane of the watch glass assembly 2 touches the watch glass limiting platform 1-1-7, thus assembling the counter 1.

[0092] Place this counter 1 in a vacuum pumping device, evacuate the air in the counter 1 according to the required vacuum degree. At this time, the lower plane of the watch glass assembly 2 is completely in close contact with the watch glass limiting platform 1-1-7, and the sealing ring 5 has obvious deformation.

[0093] When long-distance transfer transportation is required, place the vacuum counter 1 horizontally to prevent vibration from causing vacuum failure. Align the guiding slope of the hook 6-1 with the outer circle at the upper end of the gear box 1-1 and snap the hook 6-1 to the first plane 1-1-8. At this time, the first elastic member 6-2 is completely in close contact with the upper plane of the watch glass 2-1, and the second elastic member 6-3 has varying degrees of deformation. Finally, place the plug-in socket 2-2-2 together with the communication line 2-2-1 outside the large rounded corner surface 6-4 and then put it into the transfer container.

Claims

1. A water meter vacuum counter, characterized in that, It includes a gear box assembly provided with a magnetic shielding ring groove and a bearing hole, a magnetic shielding ring is connected in the magnetic shielding ring groove, and a bearing is connected in the bearing hole; above the gear box of the gear box assembly, there is connected a watch glass assembly including a watch glass, a sealing cavity is formed between the watch glass and the interior of the gear box, a gear train and an electromechanical conversion unit are provided in the sealing cavity, and a cage is connected above the gear box.

2. The water meter vacuum counter according to claim 1, characterized in that, The gear box has a bearing bushing hole, a bearing bushing is provided in the bearing bushing hole, the bearing hole and the bearing bushing hole are respectively configured to be connected to a hollow cylindrical structure extending upward and downward from the center of the bottom of the gear box, the diameter of the bearing bushing hole is larger than the diameter of the bearing hole, and both the bearing hole and the bearing bushing hole are provided with an opening section whose thickness gradually thins towards the outer peripheral side.

3. A water meter vacuum counter according to claim 1, characterized in that, The gear box is a first stepped shaft structure, a first plane is formed at the shoulder of the first stepped shaft, the sealing cavity is a second stepped shaft shape, and the gear box is sequentially provided with a watch glass limit platform and a gear train limit platform from top to bottom at the shoulder of the second stepped shaft. An annular groove is provided on the watch glass limit platform, and a sealing ring is placed in the annular groove.

4. A water meter vacuum counter according to claim 1, characterized in that, The watch glass includes a first surface and a second surface opposite to the first surface, the second surface is located on the side close to the sealing cavity, the watch glass is provided with a through hole extending from the first surface to the second surface, a sealing washer is connected to the first surface on the periphery of the through hole, a handle cap is connected to the second surface on the periphery of the through hole, and a wire threading plastic part is connected in the through hole.

5. A water meter vacuum counter according to claim 4, characterized in that, The wire threading plastic part includes a pin connected to the socket of the electromechanical conversion unit, one end of the pin close to the first surface is connected to one end of a communication wire, the other end of the communication wire is connected to a plug-in seat, the plug-in seat is connected to the cage, and a sealing retaining ring is connected to the outer peripheral side of the end of the wire threading plastic part extending out of the first plane.

6. The water meter vacuum counter according to claim 1, wherein The cage has a rounded square top surface, the edge of the top surface extends vertically downward to form a side surface, the side surface includes three small rounded surfaces and one large rounded surface, straight edge surfaces are connected between the four rounded surfaces, a circular opening is provided in the center of the top surface, and four fan-shaped straight die openings concentric with the circular opening are provided at the four corner directions on the top surface outside the circular opening.

7. A water meter vacuum counter according to claim 6, characterized in that The top surface between the straight die opening and the circular opening is recessed downward to form a bent first elastic part and a horizontal second elastic part. The lower surface of the second elastic part abuts against the upper surface of the watch glass. A hook extending downward from the outer diameter of the straight die opening is provided on the top surface, and a connecting part is provided at the edge of the large rounded surface.

8. A water meter vacuum counter according to claim 1, characterized in that, The gear train is fixed by the positioning posts of the gear box, and the gear train has a coupling gear that abuts against the top surface of the bearing.

9. A water meter vacuum counter according to claim 3, characterized in that, A sealing disassembly opening is provided at the upper edge of the gear box, and a positioning boss is connected to the outer wall of the gear box directly below the sealing disassembly opening. The positioning boss is located below the first plane.

10. A water meter vacuum counter according to any one of claims 1-9, characterized in that, Several reinforcing ribs are provided on the inner bottom surface of the gear box, and the reinforcing ribs are distributed in a circumferential manner.

Images