Lightweight anti-backflow agricultural plastic shell water meter

Abstract

The utility model relates to the technical field of agricultural irrigation water meters, and particularly discloses a lightweight anti-backflow agricultural plastic shell water meter which comprises a composite material shell, a filter screen is arranged on the end face of the composite material shell, an end cover is arranged on the top of the composite material shell, and a plastic cover disc is installed on the top of the end cover. A wireless metering module is installed in the plastic cover disc, a mechanical dial plate is installed on the top of the plastic cover disc, and a conical transmission gear is arranged in the middle of the end cover and connected with the magnetic transmission gear in an engaged mode. Through collaborative innovation of a composite material compression molding technology, a magnetic transmission gear linkage mechanism and an impeller displacement monitoring system, the comprehensive performance of the agricultural water meter is remarkably improved. The design has the technical advantages of light weight, low power consumption and high reliability, the core pain points that a traditional water meter is prone to corrosion, high in maintenance cost and poor in metering precision in a complex farmland environment are solved, and an innovative solution is provided for precise irrigation and efficient utilization of water resources.

Description

Technical Field

[0001] This utility model relates to the field of agricultural irrigation water meter technology, specifically a lightweight anti-backflow agricultural plastic-cased water meter. Background Technology

[0002] In agricultural irrigation, water meters, as core equipment for accurately measuring irrigation water consumption, directly impact water resource allocation efficiency and agricultural production costs. However, existing agricultural water meters generally suffer from multiple technical defects, hindering the sustainable development of modern agriculture. Traditional agricultural water meters mostly use metal or plastic casings. The former is heavy (a single meter typically weighs over 20 kg) and prone to corrosion (especially in saline-alkali soils or high-chloride environments), leading to high maintenance costs. The latter suffers from insufficient impact resistance (the notched impact strength of conventional plastic casings is less than 20 kJ / m²). 2 These casings are easily damaged during field operations due to being run over by agricultural machinery or accidental collisions. This type of casing structure not only increases the difficulty of transportation and installation, but also shortens the service life of the water meter. Especially in harsh outdoor environments, the casing ages significantly faster, often requiring replacement in less than 3 years, resulting in resource waste.

[0003] Furthermore, existing water meter filter designs and self-cleaning mechanisms have significant shortcomings. Traditional filters often use a single-pore structure (commonly 4-6mm), making them unsuitable for complex water quality conditions. Sediment, weeds, and other impurities easily accumulate on the filter surface, leading to increased water resistance and higher metering errors (some cases show error rates reaching 15%-20% after clogging). Although some water meters are equipped with manual flushing functions, these rely on regular manual operation (usually requiring cleaning 1-2 times per week), failing to dynamically adjust the cleaning frequency based on the actual degree of clogging, resulting in ineffective water resource waste (an average of approximately 0.5-1.2m³ of water wasted per acre for irrigation). 3 ( / time). More importantly, the clogging monitoring of traditional water meters relies entirely on manual observation and lacks a real-time feedback mechanism. Managers often find it difficult to detect filter clogging problems in a timely manner, further exacerbating water waste and low irrigation efficiency.

[0004] In terms of structural design, traditional water meters generally suffer from component redundancy. For example, some water meters use mechanical check valves and snap-fit ​​devices, resulting in low utilization of the internal space of the casing and difficulty in reducing the overall weight. At the same time, the complex mechanical structure increases the failure rate, especially in humid and dusty field environments, where problems such as bearing wear and gear jamming occur frequently, further increasing the later maintenance costs. In addition, traditional water meters are mostly powered by batteries, requiring frequent battery replacements (usually every 3-6 months), which not only increases the maintenance burden but also contributes to environmental pollution to some extent. To address this, a lightweight, backflow-proof agricultural plastic-cased water meter is proposed. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a lightweight, anti-backflow agricultural plastic-cased water meter to solve the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a lightweight anti-backflow agricultural plastic-cased water meter, comprising a composite material casing, a filter screen provided on the end face of the composite material casing, an end cap provided on the top of the composite material casing, a plastic cover plate installed on the top of the end cap, a wireless metering module installed inside the plastic cover plate, a mechanical dial installed on the top of the plastic cover plate, a conical transmission gear provided in the middle of the end cap, the conical transmission gear meshing with a magnetic transmission gear, and the magnetic transmission gear connected to an impeller.

[0007] As a preferred embodiment of this invention, the composite material shell has a wall thickness of 3mm, is molded from 60% nylon 66 and 40% chopped glass fiber, and has internal honeycomb reinforcing ribs with a density of 50 ribs / m³. 2 Impact strength ≥60MPa.

[0008] As a preferred technical solution of this utility model, the end cap and the plastic cover plate are made of polycarbonate material, which is IP68 waterproof. The end cap is fixedly connected to the composite material shell by bolts, and the plastic cover plate is snap-fitted into the top of the composite material shell to protect the internal components and facilitate maintenance.

[0009] As a preferred technical solution of this utility model, the impeller is made of PEEK material, and the blades are embedded with neodymium iron boron permanent magnets with a magnetic induction intensity ≥0.6T. The impeller is installed at the axial position inside the composite material shell, and a gradient aperture filter screen is set on the outside of the impeller. The filter screen is a V-shaped mesh made of 316L stainless steel with a near-end aperture of 3mm and a far-end aperture of 6mm. The filter screen is connected to the composite material shell by a DIN 3017 standard clamp, which supports quick assembly and disassembly.

[0010] As a preferred technical solution of this utility model, the rotational motion of the impeller is transmitted to the conical transmission gear through a magnetic transmission gear to form a two-stage reduction mechanism with a total reduction ratio of 1:40. This drives the mechanical dial pointer to rotate and synchronously updates the data of the wireless metering module. The magnetic transmission gear is composed of a samarium cobalt magnet and a magnetically conductive stainless steel gear ring. The module of the magnetic transmission gear and the conical transmission gear is 1.5, and the transmitted torque is ≥5 N·m. The mechanical dial and the wireless metering module are linked through a magnetic induction counter with an accuracy of ±1%.

[0011] As a preferred technical solution of this utility model, a magnetic induction counter is installed at the end of the magnetic transmission gear to monitor the impeller displacement ΔH in real time. After the signal is processed by the MCU, it drives the mechanical dial pointer to rotate and triggers LoRa wireless transmission. The magnetic induction counter is a Hall sensor array.

[0012] As a preferred technical solution of this utility model, the key stress areas inside the composite material shell are provided with rigid supports, which are made of carbon fiber reinforced PP material to ensure stability under high-speed operation.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention significantly improves the overall performance of agricultural water meters through the synergistic innovation of composite material compression molding technology, magnetic transmission gear linkage mechanism, and impeller displacement monitoring system. Compared to traditional metal or ordinary plastic casing water meters, its lightweight design (casing weight ≤ 5kg, a 75% reduction compared to traditional products) combined with a nano-hydrophobic coating (contact angle > 150°) and a honeycomb reinforcing rib structure (density 50 ribs / m²) 2 It achieves an impact resistance strength of ≥80kJ / m 2 Breakthroughs in salt spray corrosion resistance (no damage after 48 hours in 5% NaCl solution) and long service life (>10 years); the impeller displacement monitoring system (accuracy ±0.1mm) achieves accurate judgment and remote alarm of sludge retention status by real-time detection of sludge accumulation status (trigger threshold ΔH>0.3mm), linked with a magnetic transmission gear set (Samarium cobalt magnet + magnetically conductive stainless steel, transmission efficiency 96%) and a wireless module (LoRa transmission distance ≥3km), improving efficiency by 90% compared to traditional manual inspection; the self-cleaning execution module removes more than 95% of sludge deposits at 0.3-0.6MPa pressure using high-speed jet technology (flow velocity ≥3m / s), with a single flush water consumption ≤0.3m³. 3 Compared to fixed-cycle flushing, it saves 40% of water. With its advantages of lightweight, low power consumption and high reliability, this design solves the core pain points of traditional water meters, such as easy corrosion, high maintenance costs and poor metering accuracy in complex farmland environments, and provides an innovative solution for precision irrigation and efficient water resource utilization. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This utility model Figure 1 Top view;

[0017] Figure 3 This utility model Figure 1 The left view.

[0018] In the diagram: 1. Composite material housing; 2. Filter screen; 3. Magnetic transmission gear; 4. End cap; 5. Wireless metering module; 6. Mechanical dial; 7. Plastic cover plate; 8. Conical transmission gear; 9. Rigid support; 10. Impeller. Detailed Implementation

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.

[0020] Example: Please refer to Figure 1-3 This utility model provides a technical solution: a lightweight anti-backflow agricultural plastic-cased water meter, including a composite material casing 1, a filter screen 2 provided on the end face of the composite material casing 1, an end cover 4 provided on the top of the composite material casing 1, a plastic cover plate 7 installed on the top of the end cover 4, a wireless metering module 5 installed inside the plastic cover plate 7, a mechanical dial 6 installed on the top of the plastic cover plate 7, a conical transmission gear 8 provided in the middle of the end cover 4, the conical transmission gear 8 meshing with a magnetic transmission gear 3, and the magnetic transmission gear 3 connected to an impeller 10.

[0021] The composite shell 1 has a wall thickness of 3mm and is made of 60% nylon 66 and 40% chopped glass fiber through compression molding. It has internal honeycomb reinforcing ribs with a density of 50 ribs / m³. 2 Impact strength ≥60MPa.

[0022] End cap 4 and plastic cover plate 7 are made of polycarbonate material and are IP68 waterproof. End cap 4 is fixedly connected to composite material housing 1 by bolts. Plastic cover plate 7 is snap-fitted into the top of composite material housing 1 to protect internal components and facilitate maintenance.

[0023] Impeller 10 is made of PEEK material, with neodymium iron boron permanent magnets embedded in the blades. The magnetic induction intensity is ≥0.6T. Impeller 10 is installed at the axial position inside the composite material housing 1. A gradient aperture filter screen 2 is set on the outside of impeller 10. The filter screen 2 is a V-shaped mesh made of 316L stainless steel with a near-end aperture of 3mm and a far-end aperture of 6mm. The filter screen 2 is connected to the composite material housing 1 by a DIN 3017 standard clamp, which supports quick assembly and disassembly.

[0024] The rotational motion of the impeller 10 is transmitted to the bevel gear 8 through the magnetic transmission gear 3 to form a two-stage reduction mechanism with a total reduction ratio of 1:40. This drives the pointer of the mechanical dial 6 to rotate and synchronously updates the data of the wireless metering module 5. The magnetic transmission gear 3 is composed of a samarium cobalt magnet and a magnetically conductive stainless steel gear ring. The module of the magnetic transmission gear 3 and the bevel gear 8 is 1.5, and the transmitted torque is ≥5 N·m. The mechanical dial 6 and the wireless metering module 5 are linked through a magnetic induction counter with an accuracy of ±1%.

[0025] A magnetic induction counter is installed at the end of the magnetic transmission gear 3 to monitor the displacement ΔH of the impeller 10 in real time. After the signal is processed by the MCU, it drives the pointer of the mechanical dial 6 to rotate and triggers LoRa wireless transmission. The magnetic induction counter is a Hall sensor array.

[0026] Rigid supports 9 are provided in the key stress areas inside the composite material shell 1. The rigid supports 9 are made of carbon fiber reinforced PP material to ensure stability under high-speed operation.

[0027] Working Principle: This lightweight, backflow-preventing agricultural plastic-cased water meter utilizes three core mechanisms—impeller displacement monitoring, magnetic transmission counting, and self-cleaning—to achieve real-time detection and dynamic cleaning of silt retention. The specific process is as follows: When water flow drives the impeller 10 to rotate, the neodymium iron boron permanent magnets (magnetic induction intensity ≥0.6T) embedded in the impeller blades rotate with the shaft. A non-contact magnetic induction counter (Hall sensor array) monitors the impeller displacement ΔH in real time. When the filter 2 experiences increased water flow resistance due to silt accumulation, the impeller speed decreases, and the displacement ΔH exceeds a preset threshold (>0.3mm), triggering an alarm signal. This signal is uploaded to the cloud management platform via wireless module 5 using the LoRa protocol (transmission distance ≥3km), simultaneously driving the red warning light on the mechanical dial 6 to flash, prompting manual intervention or initiating the self-cleaning program.

[0028] The rotational motion of the impeller 10 is transmitted to the magnetic transmission gear set 3 via magnetic coupling. This gear set uses a samarium cobalt permanent magnet (magnetic energy product ≥28MGOe) meshing with a magnetically conductive stainless steel gear ring to achieve contactless torque transmission and reduce mechanical wear. The transmission gear set 3 and the bevel transmission gear 8 form a two-stage reduction mechanism (total reduction ratio 1:40), converting the high speed of the impeller (0-200rpm) into a low-speed, high-torque output, driving the pointer of the mechanical dial 6 to rotate (scale accuracy ±1%) and synchronously updating the cumulative flow data of the wireless module 5 (error rate <±1.5%).

[0029] After the system detects sludge and triggers an alarm, the user can increase the inlet water pressure to 0.3-0.6 MPa via a manual valve or automatic control unit (PLC). High-pressure water flows in reverse through the flushing pipe into the gap between filter screen 2 and impeller 10, forming a high-speed jet (flow velocity ≥ 3 m / s), which peels off the attached sludge through the shear force of the water flow. During flushing, impeller 10 automatically resets to its initial position (ΔH < 0.1 mm) under the impact of the reverse water flow. After cleaning, the system returns to normal operation. According to experimental data, this self-cleaning process can remove more than 95% of sludge deposits (when the blockage rate is > 20%), with a single flush water consumption ≤ 0.3 m³ / s. 3 It takes less than 30 seconds.

[0030] 1. Overall assembly structure

[0031] The water meter body consists of a composite material shell 1 forming the outer frame. The shell wall is 3mm thick and is made of 60% nylon 66 and 40% chopped glass fiber through molding. The interior is reinforced with honeycomb-shaped ribs (density 50 ribs / m²). 2 The components are distributed in the bearing housing and gearbox area using a topology optimization algorithm, and have an impact resistance strength ≥80kJ / m. 2 End caps 4 and plastic cover plates 7 (made of polycarbonate, IP68 waterproof) are installed at both ends of the housing. End caps 4 are fixed to the housing by bolts, and plastic cover plates 7 are snap-fitted into the top of the housing to protect internal components and facilitate maintenance.

[0032] 2. Installation of core functional components

[0033] Impeller 10 is made of PEEK material, with neodymium iron boron permanent magnets embedded in the blades (magnetic induction intensity ≥0.6T). It is installed at the axial position inside the housing. A gradient aperture filter screen 2 (316L stainless steel V-shaped mesh, 3mm near-end aperture and 6mm far-end aperture) is set on the outside of impeller 10. The filter screen 2 is connected to the housing by a DIN 3017 standard clamp, which supports quick disassembly and assembly.

[0034] The rotational motion of the impeller 10 is transmitted to the bevel gear 8 (module 1.5, helix angle 15°) through the magnetic transmission gear 3 (samarium cobalt magnet + magnetic stainless steel gear ring), forming a two-stage reduction mechanism (total reduction ratio 1:40), which drives the pointer of the mechanical dial 6 to rotate and synchronously updates the data of the wireless metering module 5.

[0035] A magnetic induction counter (Hall sensor array) is installed at the end of the magnetic transmission gear 3 to monitor the displacement ΔH of the impeller 10 in real time. After the signal is processed by the MCU (STM32L series), it drives the pointer of the mechanical dial 6 to rotate (scale accuracy ±1%) and triggers LoRa wireless transmission (transmission distance ≥3km).

[0036] Rigid supports 9 are installed in key stress areas inside the housing (such as bearing housings and gearboxes). The layout is optimized through finite element analysis (FEA), and carbon fiber reinforced PP material is used (bending stiffness is increased by 30%) to ensure stability under high-speed operation (speed > 1500 rpm).

[0037] 3. Self-cleaning and sealing design

[0038] Self-cleaning operation: When the impeller displacement ΔH > 0.3mm (sludge accumulation trigger threshold), the system increases the inlet water pressure to 0.3-0.6MPa through a manual valve or automatic control unit (PLC). The high-pressure water flows in reverse through the flushing pipe and is injected into the gap between the filter screen 2 and the impeller 10 to form a high-speed jet (flow velocity ≥ 3m / s) to peel off the attached sludge.

[0039] Sealing system: The shaft seal adopts a three-stage combined seal (spring-loaded metal bellows + spiral groove mechanical seal + magnetohydrodynamic seal), with a leakage rate of <0.02% / h; the meshing surface of the transmission gear is coated with a nano-ceramic coating (thickness 50μm), with a friction coefficient of <0.1 and a wear-resistant life of more than 8 years.

[0040] The above embodiments merely illustrate the implementation of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A lightweight anti-backflow agricultural plastic-cased water meter, comprising a composite material casing (1), characterized in that: The end face of the composite material shell (1) is provided with a filter screen (2), the top of the composite material shell (1) is provided with an end cap (4), the top of the end cap (4) is provided with a plastic cover plate (7), the inside of the plastic cover plate (7) is provided with a wireless metering module (5), the top of the plastic cover plate (7) is provided with a mechanical dial (6), the middle of the end cap (4) is provided with a conical transmission gear (8), the conical transmission gear (8) is meshed with a magnetic transmission gear (3), and the magnetic transmission gear (3) is connected to an impeller (10).

2. The lightweight anti-backflow agricultural plastic-cased water meter according to claim 1, characterized in that: The composite material shell (1) has a wall thickness of 3 mm and is molded from 60% nylon 66 and 40% chopped glass fiber. It has internal honeycomb reinforcing ribs with a density of 50 ribs / m³. 2 Impact strength ≥60MPa.

3. The lightweight anti-backflow agricultural plastic-cased water meter according to claim 1, characterized in that: The end cap (4) and the plastic cover plate (7) are made of polycarbonate material and are IP68 waterproof. The end cap (4) is fixedly connected to the composite material housing (1) by bolts. The plastic cover plate (7) is snap-fitted into the top of the composite material housing (1) to protect the internal components and facilitate maintenance.

4. The lightweight anti-backflow agricultural plastic-cased water meter according to claim 1, characterized in that: The impeller (10) is made of PEEK material, and the blades are embedded with neodymium iron boron permanent magnets with a magnetic induction intensity ≥0.6T. The impeller (10) is installed at the axial position inside the composite material housing (1). A gradient aperture filter screen (2) is set on the outside of the impeller (10). The filter screen (2) is made of stainless steel 316L V-shaped mesh with a near-end aperture of 3mm and a far-end aperture of 6mm. The filter screen (2) is connected to the composite material housing (1) by a DIN 3017 standard clamp, which supports quick assembly and disassembly.

5. The lightweight anti-backflow agricultural plastic-cased water meter according to claim 1, characterized in that: The rotational motion of the impeller (10) is transmitted to the conical transmission gear (8) through the magnetic transmission gear (3) to form a two-stage reduction mechanism with a total reduction ratio of 1:

40. This drives the pointer of the mechanical dial (6) to rotate and synchronously updates the data of the wireless metering module (5). The magnetic transmission gear (3) is composed of a samarium cobalt magnet and a magnetically conductive stainless steel gear ring. The module of the magnetic transmission gear (3) and the conical transmission gear (8) is 1.5, and the transmitted torque is ≥5 N·m. The mechanical dial (6) and the wireless metering module (5) are linked through a magnetic induction counter with an accuracy of ±1%.

6. The lightweight anti-backflow agricultural plastic-cased water meter according to claim 1, characterized in that: A magnetic induction counter is installed at the end of the magnetic transmission gear (3) to monitor the displacement ΔH of the impeller (10) in real time. After the signal is processed by the MCU, it drives the pointer of the mechanical dial (6) to rotate and triggers LoRa wireless transmission. The magnetic induction counter is a Hall sensor array.

7. The lightweight anti-backflow agricultural plastic-cased water meter according to claim 1, characterized in that: The composite material shell (1) has a rigid support (9) in the key stress area inside. The rigid support (9) is made of carbon fiber reinforced PP material to ensure stability under high speed.

Images