Anti-freezing water meter

Abstract

The invention discloses an anti-freezing water meter, relates to the technical field of anti-freezing of water meters, and aims at solving the problem that the anti-freezing water meter is insufficient in freezing avoiding space, the anti-freezing water meter comprises a meter shell assembly, an impeller box assembly comprising an impeller box is arranged in the meter shell assembly, and a plurality of shrinkage blind holes are formed in the impeller box; the impeller box assembly is connected with a gear train assembly comprising a signaling pointer and an upper clamping plate through an installation assembly, a shape-following cavity is formed in the first end of the upper clamping plate, a transparent cover is arranged between the second end of the upper clamping plate and the meter shell assembly, and the gear train assembly is arranged in a movement cavity defined by the transparent cover. According to the anti-freezing water meter, the multi-layer anti-freezing design is adopted, the anti-freezing water meter is simple in structure, convenient to assemble, easy to implement and low in cost, the occupied installation space can be reduced, the installation period can be shortened, and the anti-freezing water meter can adapt to the working conditions of different freezing strengths.

Description

Technical Field

[0001] The invention relates to the technical field of water meter antifreeze and anti-freeze, and in particular to an antifreeze water meter. Background Art

[0002] Water meters are important measuring instruments for people's livelihood, but they are prone to frostbite and cracking due to cold waves in winter. In order to reduce the impact of cold waves on water meters, freezing warning technology, antifreeze technology and antifreeze technology can be adopted. Among them, antifreeze technology is to use high-strength materials or antifreeze structures with excellent toughness to prevent structural damage, electronic function failure and metering performance degradation in water meters after freezing. High-strength materials such as nylon plastic and polyphenylene ether plastic are used for the case, and polycarbonate plastic and nylon 12 plastic are used for the watch glass. The antifreeze structure mainly includes space avoidance type and drainage pressure relief type. However, the existing technologies using the above-mentioned antifreeze methods or their combination have major defects.

[0003] For example, the patent with publication number CN214308915U adopts freezing warning technology, but does not have actual antifreeze and anti-freeze functions. In periods of drastic temperature drops, the water meter may be damaged by freezing due to untimely protection; Patent CN105910669A adopts antifreeze technology, that is, an antifreeze structure that senses freezing temperature to drain water. At low temperatures, the drain valve is opened to release the water in the meter to prevent the water in the meter from freezing and expanding and damaging the water meter components, thereby achieving antifreeze for the water meter, and the appearance structure and metering performance of the water meter are not affected. However, this structure is prone to cause long-term water flow due to the failure of the water inlet and outlet of the water meter to freeze, which can easily flood facilities and equipment and cause economic disputes; or the drain valve freezes first, the valve cannot be opened, and the antifreeze function is lost.

[0004] Patent CN203443627U and Patent CN106052786A use space avoidance antifreeze technology. When freezing, the expansion volume of frozen water is absorbed by built-in elastic materials such as foam pads, thereby reducing or eliminating the pressure inside the surface. However, during the freezing process, the elastic material continuously absorbs the expansion volume, resulting in insufficient reserved space. Due to long-term compression deformation, the elastic material is very likely to undergo permanent deformation and has a low reuse rate. In addition, the hygienic performance of this type of material is a major problem.

[0005] Patent CN108917870B adopts a typical drainage and pressure relief antifreeze structure, which almost does not change the external dimensions of the water meter to achieve the antifreeze of the water meter. Patent CN108931278B adopts an antifreeze structure that combines the space avoidance type and the drainage and pressure relief type. When the internal pressure of the water meter is greater than the spring force during freezing, the internal water that has not yet frozen pushes the piston rod to move, opening the drainage channel, thereby releasing the internal pressure. However, the above two patents have complex structures, low production efficiency, and difficult to control elastic force. Excessive elastic force will cause other components to be damaged by the frozen internal pressure first. Excessive elastic force will cause the water inlet and outlet of the water meter to be drained prematurely before they are completely frozen, which is equivalent to water leakage. In addition, impurities or ice chips can easily block the drainage hole, and the spring piston can easily be frozen and lose the antifreeze ability of drainage and pressure relief.

[0006] At present, the most widely used antifreeze and anti-freeze solution on the market is to install an insulation box outside the water meter. This water meter insulation method is the most mature and has the highest popularity, but this method has high requirements for installation space, requires pre-construction, has a long construction period, and has high material and installation costs. In particular, the electric heating insulation box has high requirements for connection electricity, is prone to fire, has safety hazards, consumes a lot of electricity, and has low economic efficiency. Summary of the invention

[0007] In order to solve the problem of insufficient ice avoidance space for antifreeze-resistant water meters, the present invention proposes an antifreeze-resistant water meter with a multi-level antifreeze design. For weak antifreeze requirements, a conformal cavity structure is adopted to ensure that the water meter can be used to work normally in short-term, low-intensity freezing conditions. For strong antifreeze requirements, the transparent cover structure can resist long-term, high-intensity freezing damage without affecting the water metering after freezing recovery. The structure is simple, easy to assemble, easy to implement, low cost, can reduce the occupancy of installation space and shorten the installation period.

[0008] In order to achieve the above object, the present invention adopts the following technical scheme: an antifreeze water meter, It includes a watch case assembly, wherein an impeller box assembly including an impeller box is arranged inside the watch case assembly, wherein the impeller box is provided with a plurality of shrinkage blind holes, wherein the impeller box assembly is connected to a gear train assembly including a signal transmitting pointer and an upper clamping plate via a mounting assembly, wherein a conformal cavity is arranged at a first end of the upper clamping plate, and a transparent cover is arranged between the second end and the watch case assembly, wherein the gear train assembly is arranged in a movement cavity surrounded by the transparent cover, and the signal transmitting pointer is provided with a signal generator enclosed inside the signal transmitting pointer.

[0009] In the present technical solution, shrinkage blind holes and conformal cavities are respectively provided in the impeller box and the upper clamping plate, so as to reserve space for the volume expansion and release of water freezing without increasing the complexity of the structure, thereby improving the anti-freezing ability of the water meter; a transparent cover with a simple structure is provided between the gear train assembly and the case assembly, so that there is no need to significantly adjust the structure of the water meter, thereby reducing the actual cost of opening a new mold, shortening the development cycle, and reducing the risk of new research and development, thereby locking a large amount of air when the water meter is in use, providing sufficient volume expansion avoidance space for freezing, and avoiding damage to the water meter; through the multi-level anti-freezing design, the water meter can adapt to freezing conditions of different intensities.

[0010] Preferably, the signal-transmitting pointer includes a needle holder and a needle disk with a hollow cylindrical structure having side surfaces and a top surface, the top surface and the side surfaces form a signal generator slot, a buckle extends inward from the bottom of the side surface of the needle disk, buckle slots are provided on both side edges of the buckle, an annular cylindrical axial hole with an outer circle and an inner square is provided in the center of the first side of the needle holder, and a rib edge extends outward from the edge on the second side, the needle holder is snapped into the buckle, and the signal generator is pressed against the signal generator slot by the rib edge.

[0011] Preferably, the impeller box includes a cylindrical inner cylindrical surface, the top end of the inner cylinder extends outward to form an upper edge, a plurality of protrusions are provided on the upper edge, the interval between two of the protrusions forms a water inlet grid, the bottom of the water inlet grid is located at the upper edge of the impeller box, the protrusion is located above the upper edge of the impeller box, and the shrinkage blind hole extends upward from the bottom end of the protrusion into the protrusion.

[0012] Preferably, an adjustment plate is provided at the bottom of the impeller box, and the adjustment plate is connected to the impeller box by a fastening screw, and a filter is connected to the lower plane of the upper edge, and the filter includes a columnar side and a convex arc-shaped lower bottom surface, and the top of the columnar side extends outward to form the upper edge of the filter, and the case assembly includes a case with a water inlet end, and the water inlet end is connected to the lower plane of the edge of the filter, and the water inlet end is provided with a smooth transition arc surface that allows water to flow smoothly.

[0013] Preferably, the transparent cover is integrally formed by a top plate and a cylindrical side plate, the top plate is composed of a large cylinder connected to the first end of the side plate and a small cylinder connected to the large cylinder, the small cylinder is provided with a signal pointer collection window, the outer side of the side plate is provided with a movement positioning boss, the second end of the side plate is provided with a counter positioning groove, and a positioning square platform extends inwardly from the connection between the side plate and the top plate.

[0014] Preferably, the gear train assembly includes a gear train consisting of a counter and an indicating device, the first end of the gear train is connected to an upper clamping plate, and the second end is connected to a mounting assembly, the second end of the upper clamping plate is provided with a positioning groove, and a through hole is provided in the center of the upper clamping plate.

[0015] Preferably, a plurality of square water outlet grilles are provided on the lower half of the inner cylindrical surface, and a baffle is extended outwardly from the edge of one side of the water outlet grilles.

[0016] Preferably, the watch case is connected to a middle cover, a cavity is formed between the middle cover and the watch case, the transparent cover is arranged in the cavity, and an anti-slip gasket is provided between the transparent cover and the middle cover.

[0017] Preferably, the bottom surface of the small cylinder is a spherical surface, the inner diameter of the side plate is the same as the diameter of the small cylinder, and the outer diameter of the side plate is smaller than the diameter of the large cylinder.

[0018] Preferably, the mounting assembly comprises an upper damping rib plate connected to the impeller box assembly and a middle clamping plate connected to the gear train assembly, and a lower clamping plate is provided between the middle clamping plate and the upper damping rib plate.

[0019] The beneficial effects of the present invention are: 1) Shrinkage blind holes and conformal cavities are respectively set in the impeller box and the upper clamping plate, which reserve space for the volume expansion and release of water freezing without increasing the complexity of the structure, thereby improving the anti-freezing ability of the water meter; 2) The transparent cover locks a large amount of air when the water meter is in use, providing sufficient space for volume expansion to avoid freezing and avoid damaging the water meter; the transparent cover has a simple structure and does not require a significant adjustment to the water meter structure, which reduces the actual cost of opening a new mold, shortens the development cycle, and reduces the risk of new research and development; 3) Multi-level anti-freeze design, the conformal cavity structure can be applied to short-term, low-intensity freezing conditions to ensure the normal operation of the water meter. The transparent cover structure can resist long-term, high-intensity freezing damage and does not affect the water metering after freezing recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of an antifreeze water meter of the present invention.

[0021] Figure 2 The invention discloses a cross-sectional view of an impeller box and its components of an antifreeze water meter.

[0022] Figure 3 The utility model is a cross-sectional view of an upper damping rib plate of an antifreeze water meter of the present invention.

[0023] Figure 4 The utility model is a schematic diagram of the lower clamping plate structure of an antifreeze water meter of the present invention.

[0024] Figure 5 It is a schematic diagram of the upper clamping plate structure of an antifreeze water meter of the present invention.

[0025] Figure 6 The utility model discloses a transparent cover axial sectional view of an antifreeze water meter according to the present invention.

[0026] Figure 7 The present invention is a schematic diagram of an upper clamping plate for installing a signal pointer of an antifreeze water meter.

[0027] Figure 8 The present invention is a schematic diagram of the structure of a signal pointer of an antifreeze water meter.

[0028] Fig. 9 The present invention is a schematic diagram of an upper clamping plate of an antifreeze water meter without a signal pointer installed.

[0029] Figure numerals: case 1; smooth transition arc surface 1-1; impeller box 2; contraction blind hole 2-1; water outlet grille 2-2; water inlet grille 2-3; top 2-4; inner cylindrical surface 2-5; trapezoidal surface 2-6; lower cylindrical surface 2-7; lower damping rib 2-8; adjustment plate 2-9; fastening screw 2-10; upper damping rib plate 3; connecting piece 3-1; guide inclined surface 3-1-1; edge 3-1-2; fillet 3-1-3; rib plate impeller hole 3-2; reinforcing rib 3-3; contraction groove 3-4; rib plate cylindrical surface 3-5; damping rib 3-6; lower splint 4; positioning flange 4-1; fastening screw hole 4-2; connecting piece hole 4-3; lower plate impeller hole 4-4; middle splint 5; upper splint 6; conformal cavity 6-1; positioning groove 6 -2; cylindrical side plate 6-3; center hole 6-4; alignment mark 6-5; transparent cover 7; large cylinder 7-1; small cylinder 7-2; signal pointer collection window 7-3; transparent cover side plate 7-4; movement positioning boss 7-5; counter positioning groove 7-6; positioning square table 7-7; filter 8; impeller 9; gear train 10; movement gasket 11; anti-slip gasket 12; middle cover 13; signal pointer 14; needle plate 14-1; small dial 14-1-1; signal generator groove 14-1-2; needle plate side 14-1-3; buckle groove 14-1-4; buckle 14-1-5; signal generator 14-2; needle support 14-3; rib edge 14-3-1; flat circular plate 14-3-2; hole column 14-3-3. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] According to the stage of freezing, the existing water meter antifreeze and anti-freeze technology can be roughly divided into: Stage 1 freezing warning technology; Stage 2 antifreeze technology; Stage 3 antifreeze technology.

[0032] The freezing warning technology is a built-in temperature sensor or chip in the water meter. When the ambient temperature drops to near the freezing point, the remote transmission module sends a freezing warning message to remind the meter management department or end user to do a good job of insulation protection for the water meter, such as closing the water meter box door, wrapping thermal insulation cotton, installing XPS / foamed polyurethane and other insulation covers, or opening the water valve to "let the water flow slowly" and drain the accumulated water in the water meter.

[0033] Antifreeze technology is the use of physical means in the early stage of freezing, such as installing an insulation box, insulation filler, pressure relief valve, or heating the water meter body and insulation box, or draining water when sensing the freezing temperature and the limit internal pressure. Insulation boxes, insulation sleeves and insulation fillers are commonly made of insulation materials such as XPS, foamed polyurethane, and insulation cotton. Heating methods include ultrasonic vibration heating, AC power or self-generated electric heating wire heating.

[0034] Antifreeze technology uses high-strength materials or antifreeze structures with excellent toughness to prevent the water meter from suffering structural damage, electronic function failure, and metering performance degradation after freezing occurs.

[0035] High-strength materials such as nylon plastic and polyphenylene ether plastic for watch cases, polycarbonate plastic and nylon 12 plastic for watch glasses.

[0036] The antifreeze structures mainly include space avoidance type and drainage and pressure relief type.

[0037] The space-avoidance antifreeze structure accommodates the expansion volume of frozen water by reserving space, thereby preventing the volume expansion force from damaging the water meter parts. The reserved space is generally a piston with a hollow air bag and foam pad, a compressible elastomer, a metal shrapnel or a spring.

[0038] The drainage and pressure relief antifreeze structure opens the drain valve and drain hole when the water pressure caused by the expansion of part of the water freezing is greater than the preset elastic force, thereby releasing the high water pressure and preventing the volume expansion of all the water freezing, thereby achieving antifreeze of the water meter.

[0039] However, the existing technologies for achieving antifreeze and anti-freeze by using the above structures or their combination have great defects. Therefore, the present invention proposes an antifreeze water meter structure with simple structure, convenient assembly, easy implementation and low cost.

[0040] Example 1 This embodiment provides an antifreeze water meter, referring to Figure 1 , including a case assembly, an impeller box assembly, a counter assembly and a mounting assembly, can resist long-term, high-intensity freezing damage and does not affect the water metering after freezing recovery.

[0041] The case assembly includes a case 1 having a water inlet end, wherein the water inlet end is connected to the lower plane of the upper edge of the filter screen, the water baffle structure is eliminated, and the water inlet end is provided with a smooth transition arc surface 1-1 that allows water to flow smoothly.

[0042] The curved surface design of the water inlet end of the case not only reduces the swirl loss, turning loss and impact loss of water pressure, but also reduces the water capacity of the case and improves the anti-freeze effect of the water meter.

[0043] The impeller box assembly is arranged inside the case assembly, and is composed of an impeller box 2, an adjusting piece 2-9, a fastening screw 2-10, a filter screen 8 and an impeller 9.

[0044] The impeller box is provided with a plurality of shrinkage blind holes 2-1, and the impeller box assembly is connected to the gear train assembly through the mounting assembly.

[0045] The gear train assembly includes a signal pointer 14 and an upper plate 6. A conformal cavity 6-1 is provided at the first end of the upper plate, and a transparent cover 7 is provided between the second end and the case assembly. The gear train assembly is arranged in the movement cavity surrounded by the transparent cover. The signal pointer has a signal generator 14-2 enclosed inside the signal pointer.

[0046] The watch case is connected with a middle cover 13, a cavity is formed between the middle cover and the watch case, and a transparent cover is arranged in the cavity.

[0047] The transparent cover is integrally formed of high-strength transparent plastic, and comprises a top plate and transparent cover side plates 7-4. The top plate is composed of a large cylinder 7-1 and a small cylinder 7-2, and a signal pointer collection window 7-3 is provided on the small cylinder.

[0048] The large cylinder and the small cylinder are both cylindrical structures, the bottom surface of the large cylinder is a circular plane, and the bottom surface of the small cylinder is a spherical surface.

[0049] By adopting a spherical design, the allowable deformation of the transparent cover is increased, and the compressive and tensile resistance of the transparent cover is improved, making it more suitable for use in environments with high water pressure and high stress.

[0050] In this embodiment, the signal transmitting pointer collection window is a circular step blind hole having a diameter equivalent to that of the signal transmitting pointer.

[0051] In some other implementations, the signal transmitting pointer collection window may also be a gap extending from the edge of the small cylinder to the inside and covering the area corresponding to the signal transmitting pointer.

[0052] The side plate is cylindrical, the first end of the side plate is connected to the large cylinder of the top plate, the second end of the side plate is provided with a counter positioning groove 7-6, the outer side wall of the side plate is provided with a movement positioning boss 7-5, and the inner connection between the side plate and the large cylinder is provided with a positioning square platform 7-7.

[0053] The inner diameter of the side plate is the same as the diameter of the small cylinder, and the outer diameter of the side plate is smaller than the diameter of the large cylinder.

[0054] In this embodiment, the counter positioning grooves are a plurality of notches opened at the second end of the side plate. The plurality of notches are square notches extending upward from the edge of the side plate and are distributed in a circle. The counter positioning grooves are engaged with the counter to play a positioning role.

[0055] The movement positioning boss is a square protrusion arranged on the outside of the side panel, which can be snapped into the watch case to play a positioning role.

[0056] The positioning square platform is a square protrusion arranged on the inner side of the side panel, which can be engaged with the movement to play a positioning role.

[0057] In this embodiment, an integrally formed transparent cover structure is used to replace the gear box and glass structure of the water meter in the prior art. The structure is simple and easy to process. There is no need to significantly adjust the water meter structure, which reduces the actual cost of opening a new mold, shortens the development cycle, reduces the risk of new research and development, and does not require additional parts or occupy a larger water meter size space.

[0058] The integrated transparent cover allows the water meter to lock in a large amount of air when in use, providing sufficient space for volume expansion when freezing occurs, thus avoiding damage to the water meter. This structure enables the water meter to resist long-term, high-intensity freezing damage, and does not affect the water metering after freezing recovery.

[0059] A movement gasket 11 is arranged between the movement positioning boss of the transparent cover and the large cylinder, and an anti-skid gasket 12 is arranged between the transparent cover and the middle cover.

[0060] The impeller box is provided with a shrinkage blind hole, a water outlet grid 2-2, a water inlet grid 2-3, a top and a lower damping rib.

[0061] like Figure 2 As shown, a cylindrical groove is provided in the center of the inner side of the bottom of the impeller box, and the top 2-4 is embedded in the cylindrical groove. The inner bottom surface of the impeller box around the cylindrical groove is provided with a plurality of radially arranged lower damping ribs 2-8. An impeller shaft is provided in the center of the impeller. One end of the impeller shaft passes through the rib plate impeller hole 3-2, the lower plate impeller hole 4-4 and the middle clamping plate through hole of the mounting assembly until it is connected to the center hole 6-4 of the upper clamping plate 6 of the gear train assembly, and the other end is connected to the top of the impeller box.

[0062] The impeller box includes a cylindrical box body side and a circular box body bottom, the box body side includes an inner cylindrical surface 2-5, the top end of the inner cylinder extends outward to form an upper edge 2-6, a plurality of protrusions are arranged on the upper edge, the interval between two of the protrusions forms a water inlet grid, the bottom of the water inlet grid is located at the upper edge of the impeller box, the protrusion is located above the upper edge of the impeller box, the shrinkage blind hole extends upward from the bottom end of the protrusion into the protrusion, a plurality of square water outlet grids are arranged on the lower half of the inner cylindrical surface, and a baffle is extended outward from the edge of one side of the water outlet grid.

[0063] The lower plane of the upper edge is connected with a filter screen, and the filter screen includes a columnar side surface and an outwardly convex arc-shaped lower bottom surface, and the top of the columnar side surface extends outward to form an upper edge of the filter screen.

[0064] An adjusting piece is arranged at the bottom of the impeller box, and the adjusting piece is connected to the impeller box through a fastening screw.

[0065] In this embodiment, the impeller box is provided with 4 water inlet grids and 4 water outlet grids. Figure 2 As shown, the water inlet grille is a columnar opening, the upper plane of the upper edge is in a circular ring shape, the bottom surface of the water inlet grille is located in the plane where the upper plane of the upper edge is located, and the water inlet grille is formed by the intersection of a first plane and a second plane parallel to the first plane and the upper plane of the upper edge, the first plane and the second plane are perpendicular to the upper plane of the upper edge and are located on the same side of the center of the upper edge.

[0066] A protrusion is arranged between adjacent water inlet grilles, and the protrusion extends upward from the upper plane of the upper edge to form a shrinkage blind hole extending upward from the bottom end of the protrusion to the inside of the protrusion.

[0067] In this embodiment, the center of the water inlet grille is concave downward to form a second shrinkage blind hole, and the lower bottom surface outside the second shrinkage blind hole is a lower cylindrical surface 2-7.

[0068] In the present embodiment, an antifreeze water meter changes the direction of the shrinkage holes that have no functional function and opens shrinkage blind holes that can absorb volume expansion. This reserves space for releasing the volume expansion of water when it freezes without increasing the complexity of the structure, thereby improving the antifreeze ability of the water meter.

[0069] The water outlet grid is a through hole formed on the side of the impeller box body by two planes parallel to the first plane and two planes parallel to the upper plane of the upper edge of the impeller box. The outer wall of the side of the box body at the water outlet grid is a plane. The side of the box body at one side edge of the water outlet grid extends outward to form a baffle. The baffle is perpendicular to the upper plane of the upper edge and has an acute angle with the plane where the outer wall of the side of the box body at the water outlet grid is located.

[0070] In this embodiment, the counter assembly is composed of a gear train assembly and a mounting assembly.

[0071] The mounting assembly comprises an upper damping rib plate 3, a lower clamping plate 4 and a middle clamping plate 5, the upper damping rib plate is connected to the impeller box assembly, the middle clamping plate is connected to the gear train assembly, and the lower clamping plate is arranged between the middle clamping plate and the upper damping rib plate.

[0072] The upper damping rib plate is provided with a connecting piece 3-1, a rib plate impeller hole 3-2, a reinforcing rib 3-3, a contraction groove 3-4, a rib plate cylindrical surface 3-5 and a damping rib 3-6.

[0073] A rib impeller hole is provided in the center of the upper damping rib plate, a first side of the upper damping rib plate is connected to a plurality of connecting parts, and a second side is connected to a plurality of radially distributed damping ribs through the cylindrical surface of the rib plate, the connecting part includes a supporting part and a positioning part, the supporting part is a solid smooth cylinder with a rounded rectangular cross-section, one end of the supporting part is connected to the first side of the upper damping rib plate, and the other end is connected to the guiding inclined surface 3-1-1 of the positioning part, the guiding inclined surface is connected to the top surface, and the top surface is a circular plane.

[0074] The cross section of the supporting part of the connector is a rounded rectangle, and the curved surface formed by the rounded corners 3-1-3 of the rounded rectangle on the side of the supporting part serves as an interference fit surface. The edges 3-1-2 of the rounded rectangle on the corresponding plane on the side of the supporting part can form assembly exhaust holes, thereby facilitating interference assembly.

[0075] The positioning part of the connecting piece is provided with a guiding inclined surface to facilitate positioning and installation.

[0076] The design of the outer circle and inner square of the supporting part and the design of the guiding slope of the positioning part greatly facilitate the interference assembly between parts, avoiding the phenomenon of plastic columns breaking, being laborious, being unable to fit in, and falling off easily during assembly.

[0077] A middle clamping plate through hole is arranged in the center of the middle clamping plate, and the middle clamping plate through hole is circular and can allow the impeller shaft to pass through.

[0078] The lower clamping plate 4 is a supporting plate for the gear, and comprises a circular plate, the edge of which has a plurality of positioning flanges 4-1 extending outward, a plurality of fastening screw holes 4-2 and connector holes 4-3 provided on the circular plate, and a lower plate impeller hole 4-4 provided in the center of the circular plate.

[0079] In this embodiment, four square positioning flanges are evenly distributed on the edge of the circular flat plate of the lower clamping plate, and three fastening screw holes and three connecting member holes are provided on the circular flat plate.

[0080] The gear train assembly comprises an upper plate 6 and a gear train consisting of a counter and an indicating device.

[0081] It should be noted that the gear train includes all gears, all pointers, all character wheels, all four-eight gears, axles and ten-tooth gears, all water meter counters and indicating device parts, and the indicating device includes a signaling pointer.

[0082] The upper clamping plate is the upper positioning and fixing hole plate of the gear train.

[0083] In this embodiment, the upper clamping plate includes a conformal cavity 6-1, a positioning groove 6-2 and a center hole 6-4.

[0084] The upper clamping plate is in the shape of a hollow cylinder, which is composed of a circular plate and a cylindrical side plate 6-3. The cylindrical side plate extends from the edge of the circular plate perpendicular to the circular plate toward the first end of the circular plate.

[0085] In the area surrounded by the cylindrical side plate, a conformal cavity is provided at the first end of the upper clamping plate.

[0086] It should be noted that the conformal cavity is formed in the gear train gap. An antifreeze water meter of the present invention achieves a reduction in the number of gears by setting a signal pointer, so that a larger gear train gap can exist in the gear train assembly. An irregular cylindrical structure extends outward from the first end of the upper clamping plate at the gear train gap, and the other end of the cylindrical structure is connected to the middle clamping plate to form a cavity.

[0087] The additional conformal cavities on the impeller box and the upper splint reserve space for the volume expansion of frozen water without increasing the complexity of the structure, thereby improving the anti-freezing ability of the water meter.

[0088] The positioning grooves are two opposite square notches arranged on the edge of the second end of the upper splint, and are used for positioning when the gear train assembly is connected to the watch case assembly.

[0089] The center hole is arranged at the center of the first end of the upper clamping plate, and the edge of the center hole extends away from the first end of the upper clamping plate to form a cylindrical structure, which can be connected to the impeller shaft of the impeller.

[0090] The first end of the upper clamping plate is printed with a registration mark 6-5 and a small dial 14-1-1 corresponding to the signal pointer needle plate. The first end of the upper clamping plate can also be printed with some other information.

[0091] The signal transmitting pointer comprises a needle dial 14-1 of a hollow cylindrical structure having a needle dial side surface 14-1-3 and a top surface, wherein the top surface and the side surface enclose a signal generator slot 14-1-2, a small dial is provided on the top surface of the needle dial, a buckle 14-1-5 extends inwardly from the bottom of the needle dial side surface, and a buckle slot 14-1-4 is provided on the side edge of the buckle.

[0092] The needle disk is connected to a needle holder 14-3, which includes a flat circular plate 14-3-2. A circular cylindrical shaft hole with an outer circle and an inner square is connected to the center of the first side of the flat circular plate, and a rib edge 14-3-1 extends outward from the edge on the second side.

[0093] The needle holder is clamped in the buckle, and the signal generator is pressed against the signal generator slot by the rib edge.

[0094] In this embodiment, the signal-transmitting pointer is a pointer-type indicating device with a signal generator such as a metal sheet, a magnetic steel magnetic group, etc., including a needle plate, a signal generator and a needle holder.

[0095] A small dial is printed on the needle dial plane, a needle dial side surface is arranged around the small dial, and a buckle and a buckle groove are provided on the needle dial side surface.

[0096] In this embodiment, the signal generator is a demagnetized metal sheet in a semicircular shape.

[0097] The needle holder is provided with a hole column 14-3-3 with a square circular shaft hole and a flat circular plate, and a circle of ribs protrudes from the flat circular plate to support the signal generator metal sheet.

[0098] It should be noted that the signal pointer has its own dial, which can eliminate a pair of synchronous gears. While reserving expansion space, it also saves parts, reduces friction resistance, and improves the measuring performance of the water meter.

[0099] By embedding the metal sheet into the signal pointer, the complicated structure and process of fixing the metal sheet can be omitted, and the camera acquisition error caused by the light of the metal sheet during the water meter inspection and calibration can be avoided, which will affect the judgment of the error of the final water value.

[0100] The following is a detailed description of the installation process of an antifreeze water meter in this embodiment.

[0101] First, print the alignment mark, other information of the upper splint and the small dial on the upper plane of the upper splint and the needle dial respectively, then place the semicircular metal sheet in the signal generator slot, and snap the flat circular plate of the needle holder into the buckle without any angle requirement, and the rib edge 14-3-1 presses against the metal sheet to form a signal pointer.

[0102] Then, after turning upside down the upper clamping plate, install the gear system, and the gear shaft holes of each pointer including the signal pointer are respectively interference fit to cover the gear shaft, and then the middle clamping plate and the lower clamping plate are placed in sequence, and the screws are tightened at the fastening screw holes. The connector is aligned with the connector hole, and the upper damping rib plate is slowly interference fit installed on the lower clamping plate to form a counter assembly.

[0103] After that, insert the movement gasket into the clamping groove of the upper plane of the movement positioning boss and the lower plane of the large cylinder along the outer wall of the transparent cover side plate. Then, invert the outer cylinder of the counter assembly and insert it into the inner wall of the inverted transparent cover side plate, and snap the positioning square into the positioning groove until the positioning flange is completely aligned with the counter positioning groove.

[0104] Then insert the impeller backwards into the impeller hole of the rib plate and the impeller hole of the lower plate until the center hole. Then align the inner cylindrical surface with the cylindrical surface of the rib plate and install the impeller box, adjustment plate and fastening screws on the upper damping rib plate. Finally, the inner cylindrical surface of the filter screen matches the lower cylindrical surface and the filter screen is installed.

[0105] Finally, after the above-mentioned integral part is inverted into the meter case 1, it is placed upright, and the anti-skid gasket is placed on the upper plane of the large cylinder. Finally, the middle cover is screwed and installed on the meter case to form a water meter base.

[0106] Example 2 The present embodiment provides a freeze-resistant water meter, including a case assembly, an impeller box assembly, a counter assembly and an installation assembly, which is suitable for weak freeze-resistant scenarios and can be used in short-term, low-intensity freezing conditions to ensure that the water meter works normally.

[0107] When the antifreeze function is weak, the transparent cover described in Example 1 of the present invention may not be used, but the watch glass of the prior art may be used, and then the lower structural parts of the transparent cover may be added, so that one movement can be used in both dry and wet ways.

[0108] In this embodiment, the integrated transparent cover is replaced by a watch glass assembly, which includes tempered glass and structural parts connected below the tempered glass.

[0109] The tempered glass of this embodiment has the same size as the large cylinder of the transparent cover in Embodiment 1, which facilitates the switching of watch glasses of different materials without having to replace the movement.

[0110] The present invention adopts a multi-level antifreeze design. The transparent cover structure can resist long-term and high-intensity freezing damage without affecting the water metering after freezing recovery. The conformal cavity structure can be applied to short-term and low-intensity freezing conditions to ensure that the water meter works normally. In antifreeze scenarios, the transparent cover of Example 1 can be replaced with the watch glass assembly of this embodiment.

Claims

1. A freeze-resistant water meter, characterized in that: It includes a watch case assembly, wherein an impeller box assembly including an impeller box is arranged inside the watch case assembly, wherein the impeller box is provided with a plurality of shrinkage blind holes, wherein the impeller box assembly is connected to a gear train assembly including a signal transmitting pointer and an upper clamping plate via a mounting assembly, wherein a conformal cavity is arranged at a first end of the upper clamping plate, and a transparent cover is arranged between the second end and the watch case assembly, wherein the gear train assembly is arranged in a movement cavity surrounded by the transparent cover, and the signal transmitting pointer is provided with a signal generator enclosed inside the signal transmitting pointer.

2. The antifreeze water meter according to claim 1, characterized in that: The signal-transmitting pointer includes a needle holder and a needle disk with a hollow cylindrical structure having side surfaces and a top surface, the top surface and the side surfaces enclose a signal generator slot, a buckle extends inward from the bottom of the side surface of the needle disk, buckle slots are provided on both side edges of the buckle, an axial hole is connected to the first side of the needle holder, and a rib edge extends outward from the edge on the second side, the needle holder is snapped into the buckle, and the signal generator is pressed against the signal generator slot by the rib edge.

3. The antifreeze water meter according to claim 1, characterized in that: The impeller box includes a cylindrical inner cylindrical surface, the top end of the inner cylinder extends outward to form an upper edge, a plurality of protrusions are arranged on the upper edge, the interval between two of the protrusions forms a water inlet grid, the bottom of the water inlet grid is located at the upper edge of the impeller box, the protrusion is located above the upper edge of the impeller box, and the shrinkage blind hole extends upward from the bottom end of the protrusion into the protrusion.

4. The antifreeze water meter according to claim 3, characterized in that: An adjusting plate is provided at the bottom of the impeller box, and the adjusting plate is connected to the impeller box by a fastening screw. The lower plane of the upper edge is connected to a filter screen, and the filter screen includes a columnar side and a convex arc-shaped lower bottom surface. The top of the columnar side extends outward to form the upper edge of the filter screen. The case assembly includes a case with a water inlet end, and the water inlet end is connected to the lower plane of the edge of the filter screen. The water inlet end is provided with a smooth transition arc surface that allows water to flow smoothly.

5. The antifreeze water meter according to claim 1, characterized in that: The transparent cover is integrally formed by a top plate and a cylindrical side plate, the top plate is composed of a large cylinder connected to the first end of the side plate and a small cylinder connected to the large cylinder, the small cylinder is provided with a signal pointer collection window, the outer side of the side plate is provided with a movement positioning boss, the second end of the side plate is provided with a counter positioning groove, and a positioning square platform extends inwardly from the connection between the side plate and the top plate.

6. The antifreeze water meter according to claim 1, characterized in that: The gear train assembly includes a gear train consisting of a counter and an indicating device. The first end of the gear train is connected to an upper clamping plate, and the second end is connected to a mounting assembly. A positioning groove is provided at the second end of the upper clamping plate, and a through hole is provided in the center of the upper clamping plate.

7. The antifreeze water meter according to claim 3, characterized in that: A plurality of square water outlet grilles are arranged at the lower half of the inner cylindrical surface, and a baffle is extended outwardly from the edge of one side of the water outlet grille.

8. The antifreeze water meter according to claim 4, characterized in that: The watch case is connected with a middle cover, a cavity is formed between the middle cover and the watch case, the transparent cover is arranged in the cavity, and an anti-slip pad is arranged between the transparent cover and the middle cover.

9. The antifreeze water meter according to claim 5, characterized in that: The bottom surface of the small cylinder is a spherical surface, the inner diameter of the side plate is the same as the diameter of the small cylinder, and the outer diameter of the side plate is smaller than the diameter of the large cylinder.

10. An antifreeze water meter according to any one of claims 1 to 9, characterized in that: The mounting assembly comprises an upper damping rib plate connected to the impeller box assembly and a middle clamping plate connected to the gear train assembly, and a lower clamping plate is arranged between the middle clamping plate and the upper damping rib plate.

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