WO2018068763A1 - 一种叶轮式无磁流量计 - Google Patents

一种叶轮式无磁流量计 Download PDF

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Publication number
WO2018068763A1
WO2018068763A1 PCT/CN2017/106081 CN2017106081W WO2018068763A1 WO 2018068763 A1 WO2018068763 A1 WO 2018068763A1 CN 2017106081 W CN2017106081 W CN 2017106081W WO 2018068763 A1 WO2018068763 A1 WO 2018068763A1
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impeller
upper casing
lower casing
base
type non
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PCT/CN2017/106081
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English (en)
French (fr)
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方欣
李新兴
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李新兴
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Publication of WO2018068763A1 publication Critical patent/WO2018068763A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/06—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission
    • G01F1/075—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission with magnetic or electromagnetic coupling to the indicating device

Definitions

  • the invention relates to a water meter flowmeter, in particular to an impeller type non-magnetic flowmeter.
  • the non-magnetic signal sampling mode is the most advantageous way of water meter sampling.
  • the non-magnetic flowmeter has stable non-magnetic signal acquisition, very small initial flow and linear characteristics, large range ratio and high sensitivity, superior wear resistance and long
  • the series of problems such as the service life and the IP67 protection level have always been a problem that has plagued many watch manufacturers, and some have even become an insurmountable technology gap.
  • the prior art non-magnetic water meter has disadvantages such as low sensitivity, poor wear resistance, high initial flow rate, unstable signal pickup, etc. due to the fact that the rotary impeller is not optimized.
  • an impeller type non-magnetic flowmeter comprising a lower casing, a lower casing top cover, an upper casing base, and an upper casing;
  • An impeller metering module is installed inside the lower casing, and the impeller metering module rotates with the fluid flowing in the lower casing;
  • a sensing module is installed between the middle portion of the lower casing top cover and the middle portion of the upper casing base, and the impeller metering module is sensed Rotating and counting;
  • a display module is mounted inside the upper casing, and is electrically connected to the sensing module Connected and displays the count of the sensing module;
  • a first sealing ring is crimped between the lower casing and the lower casing top cover, and a second sealing ring is crimped between the middle portion of the lower casing top cover and the middle portion of the upper casing base, and the upper casing base and the upper casing
  • a third sealing ring is connected to the pressure.
  • the fluid to be tested is circulated through the lower casing, and the impeller metering module is driven, and the sensing module measures the flow rate and transmits it through the cable to display on the display module.
  • the sensing module comprises an LC sensor and a PCB circuit board electrically connected to the LC sensor, a cavity for mounting the LC sensor is formed between a middle portion of the lower case top cover and a middle portion of the upper case base, A joint of the lower shell top cover and the lower shell forms a limiting joint surface. Due to the existence of the limit joint surface, after the top cover of the lower shell is mounted to the lower casing, it can only be moved down to the limit joint surface, thereby ensuring that the positions of the lower shell top cover and the lower shell are relatively fixed, and at the same time, The distance between the sensing module and the impeller metering module in different chambers is relatively fixed, ensuring stable picking of non-magnetic signals.
  • connection between the lower casing and the upper casing is provided with a corresponding rotating buckle, the rotation of the rotating buckle is tightened, and the corresponding position of the upper casing and the lower casing form a predetermined positioning combination.
  • a slot, the positioning joint groove is fitted with a positioning joint adapted thereto.
  • a middle portion of the positioning joint is provided with a stainless steel hose, and a cable is disposed in the stainless steel hose, and the cable passes through the upper casing and the upper casing base to connect the PCB circuit board inside the upper casing;
  • the connection between the cable and the upper casing base is provided with a reverse tapered rubber blockage.
  • the cable is used for electrical connection between the modules, and the inverted tapered rubber plug is tightly coupled with the cable to provide waterproofing.
  • the positioning joint can be inserted into the corresponding positions of the upper and lower casings after the upper casing and the lower casing are relatively rotationally fastened. Through the design of the positioning joint, the fixing of the output stainless steel cable sleeve and the rotational positioning of the upper casing are locked, and the overall screwless buckle structure is realized.
  • the impeller metering module comprises an impeller support shaft, a sleeve nested outside the impeller support shaft, an impeller radially arranged around the sleeve, and an induction piece embedded on the top of the impeller.
  • the upper surface of the impeller is embedded with a metal sensing piece, and a pair of LC sensors are mounted in the cavity between the middle portion of the corresponding lower case top cover and the middle portion of the upper case base.
  • the distance between the LC sensor and the sensor chip is guaranteed to be within 2.2mm, which ensures stable pickup of non-magnetic signals.
  • the sensing module generates an LC oscillation waveform.
  • the metal sensor is moved closer to the sensor and the distance is within 2.2 mm, according to the Faraday electromagnetic induction principle, eddy currents and induced electromotive force are generated in the metal sensing sheet to cancel the original electromotive force in the sensing module.
  • the amplitude of the LC oscillation waveform becomes lower, and the detection circuit in the sensor module can detect this amplitude change and count.
  • the distance between the LC sensor and the sensor chip should be less than 2.2 mm. If the distance is greater than 2.2mm, the amplitude change is not enough to be detected, the count will produce the error of the leakage meter, and the accuracy of the flowmeter will decrease; if the distance is too large, the flowmeter will directly fail.
  • the impeller has a density less than the density of water and may float slightly above the surface of the water such that the friction is minimized and the impeller is rotatable when there is a flow of microflow.
  • the impeller support shaft is a wear-resistant ceramic shaft, and the service life is long, and the experiment proves that the service life is 2-3 times that of the ordinary mechanical water meter.
  • a contact fulcrum of the sleeve and the impeller support shaft is at an upper portion of the impeller support shaft,
  • the contact fulcrum is designed in the high part of the impeller to reduce the center of gravity of the impeller, ensure the smooth operation of the impeller, improve the regularity and complex linearity of the impeller operation; the tip of the impeller breaks the rule of the upper fixed shaft, and adopts the inlaid sphere as the floating floating free positioning.
  • the role of the positioning is that when the flowmeter is installed slightly off the horizontal state, the impeller automatically adjusts the state to minimize the friction and ensure the linearity of the flow characteristics.
  • the upper casing comprises a PVC label, a PVC bracket for fixing the PVC label, an LCD display for display, a PCB circuit board electrically connected to the LCD display panel, and a PCB circuit board for positioning the PCB circuit board.
  • PCB bracket By rotating the upper casing and the lower casing, the PCB bracket can be pressed and positioned to prevent the PCB and the sensor from moving, so that the distance between the sensor and the sensor is kept within 2.2 mm, and the signal is stably picked up; the PVC bracket is ensured.
  • PVC labels can be used to display corresponding text or symbols such as product specifications.
  • the upper casing base is provided with a waterproof gas permeable valve, which functions to connect the circuit box to the outside.
  • the waterproof and breathable valve is a two-way ventilated, one-way permeable structure. Microscopically, it is a microporous structure. The gas molecules are separated from the liquid and dust particles by an order of magnitude, so that gas molecules can pass, and liquid and dust cannot pass, thereby achieving waterproofing. Breathable purpose. Even if the external temperature difference is large and the temperature is repeatedly changed, it can ensure that the pressure inside and outside the seal is always balanced, and the pressure difference is zero to the sealing ring, effectively achieving IP67 protection level.
  • Multi-stage waterproof sealing of the flowmeter is realized by designing a multi-stage sealing ring
  • the impeller has a unique structure, stable operation, low initial flow, high range ratio and measurement sensitivity
  • Figure 1 is a schematic cross-sectional view showing the entire structure of the present invention
  • FIG. 2 is a schematic cross-sectional view showing another overall structure of the present invention.
  • Figure 3 is an enlarged schematic view showing the structure of the portion A of the present invention.
  • Figure 4 is an enlarged schematic view showing the structure of a portion B of the present invention.
  • Figure 5 is a partial assembly view of the positioning joint of the present invention.
  • Figure 6 is a perspective view showing the structure of the impeller of the present invention.
  • Figure 7 is a schematic cross-sectional view of the impeller structure of the present invention.
  • Figure 8 is an enlarged schematic view showing the structure of a portion C of the present invention.
  • Figure 9 is a schematic view showing the assembly of the overall structure of the present invention.
  • the impeller-type non-magnetic flowmeter of the present embodiment includes a lower casing 1, a lower casing top cover 2, an upper casing base 3, and an upper casing 4;
  • An inner surface of the lower casing 1 is mounted with an impeller metering module 5, and the impeller metering module 5 rotates with the flow of fluid in the lower casing 1; a sensing portion is installed between the middle portion of the lower casing top cover 2 and the middle portion of the upper casing base 3 Module 6, the sensing module 6 is used to sense the rotation of the flow metering module 5 and count; the upper housing 4 is internally mounted
  • the display module 7 is electrically connected to the sensing module 6 and displays the counting of the sensing module 6;
  • a first sealing ring 8 is crimped between the lower casing 1 and the lower casing top cover 2, and a second sealing ring 9 is crimped between the middle portion of the lower casing top cover 2 and the middle portion of the upper casing base 3, and the upper casing
  • a third sealing ring 10 is crimped between the base 3 and the upper casing 4, and the first sealing ring 8, the second sealing ring 9, and the third sealing ring 10 are rubber seals having a certain elasticity, so that the lower casing 1 Elastic crimping and sealing are achieved between the lower case top cover 2, the middle portion of the lower case top cover 2 and the upper case base 3, and the upper case base 3 and the upper case 4.
  • the fluid to be tested flows in from the liquid inlet 101, flows through the lower casing 1, drives the impeller metering module 5, and flows out of the liquid outlet 102, and the sensing module 6 measures the flow rate and transmits it through the cable. Go to the display module 7.
  • the connecting portion of the lower casing 1 and the upper casing 4 is provided with a matching rotating buckle 401, and the rotating buckle 401 is screwed and tightened, and the upper casing 1 and the lower casing are arranged.
  • a predetermined positioning and engaging groove 402 is formed at a corresponding position of the fourth positioning slot 402, and the positioning coupling member 403 is fitted in the positioning coupling groove 402.
  • a middle portion of the positioning joint 403 is provided with a stainless steel hose 304.
  • the stainless steel hose 304 is provided with a cable 302.
  • the cable 302 passes through the upper casing 4 and the upper casing base 3, and is connected to the inside of the upper casing 4.
  • the PCB circuit board 602 is provided with a reverse tapered rubber plug 303 at the junction of the cable 302 and the upper casing base 3.
  • the cable 302 is used for electrical connection between the modules, and the inverted tapered rubber plug 303 is tightly coupled with the cable 302 to provide waterproofing.
  • the positioning coupling member 403 can be inserted into the corresponding positions of the upper housing 4 and the lower housing 1 after the upper housing 4 and the lower housing 1 are relatively rotated and fastened, and is designed by the positioning coupling member 403.
  • the fixing of the output stainless steel hose 304 and the rotational positioning of the upper casing 4 are locked. Now the flowmeter has no screw structure as a whole.
  • the sensing module 6 includes an LC sensor 601 and a PCB circuit board 602 electrically connected to the LC sensor 601.
  • the middle portion of the lower case top cover 2 and the middle portion of the upper case base 3 are formed.
  • a cavity for mounting the LC sensor 601, the junction of the lower casing top cover 2 and the lower casing 1 forms a limiting joint surface 103. Due to the presence of the limiting joint surface 103, after the lower casing top cover 2 is mounted to the lower casing 1, it can only be pressed down to the limit joint surface 103, thereby ensuring the position of the lower casing top cover 2 and the lower casing 1 relative to each other. Fixed, at the same time, the distance between the sensing module 6 and the impeller metering module 5 is relatively fixed, ensuring stable picking of the non-magnetic signal.
  • the impeller metering module 5 includes an impeller support shaft 501, a sleeve 502 nested outside the impeller support shaft 501, an impeller 503 radially arranged around the sleeve 502, and an induction piece 504 embedded in the top of the impeller 503.
  • the upper surface of the impeller 503 is embedded in the metal sensing piece 504, and a pair of LC sensors 601 are mounted in the cavity between the middle portion of the lower casing top cover 2 and the middle portion of the upper casing base 3.
  • the distance between the LC sensor 601 and the sensing piece 504 in this embodiment is guaranteed to be within 2.2 mm, and stable pickup of the non-magnetic signal can be ensured.
  • the sensing module 6 generates an LC oscillation waveform.
  • the metal sensing piece 504 moves closer to the LC sensor 601 and the distance is within 2.2 mm, according to the Faraday electromagnetic induction principle, eddy currents and induced electromotive force are generated in the metal sensing piece 504 to cancel the sensing.
  • the amplitude of the LC oscillation waveform becomes lower, and the detection circuit in the sensor module 6 can detect this amplitude change and count.
  • the distance between the LC sensor 601 and the inductive sheet 504 should be less than 2.2 mm. If the distance is greater than 2.2mm, the amplitude change is not enough to be detected, the count will produce the error of the leakage meter, and the accuracy of the flowmeter will decrease; if the distance is too large, the flowmeter will directly fail.
  • the impeller 503 has a density less than that of water and can float slightly on the surface of the water, so that when there is a flow of micro flow, the friction is minimized and the impeller can be rotated.
  • the impeller support shaft 501 is a wear-resistant ceramic shaft, and has a long service life of 2-3 times that of an ordinary mechanical water meter.
  • the contact fulcrum of the sleeve 502 and the impeller support shaft 501 is at the upper part of the impeller support shaft 501, and the contact fulcrum is designed at the upper part of the impeller 503 to reduce the center of gravity of the impeller 503, ensure the smooth operation of the impeller 503, and improve the operation of the impeller 503.
  • the range ratio can be increased to R250; the top of the impeller 503 breaks the rule of the previous fixed axis, and the embedded sphere is used as the floating floating free positioning.
  • the function of this positioning is when the flowmeter is installed slightly off the horizontal state.
  • the impeller 503 automatically adjusts the state to minimize the friction and ensure the linearity of the flow characteristics.
  • the upper casing 4 includes a PVC label 404, a PVC bracket 405 for fixing the PVC label 404, an LCD display 701 for display, and a PCB circuit electrically connected to the LCD screen 701.
  • the PCB bracket 603 can be pressed and positioned to prevent the PCB and the sensor from moving, so that the distance between the sensor and the sensor is kept within 2.2 mm, and the signal is stabilized.
  • Picking; PVC bracket 405 and PVC label 404 can be used to display corresponding text or symbols such as product specifications.
  • a waterproof gas permeable valve 301 is inserted through the upper casing base 3 to open the internal circuit to communicate with the outside air.
  • the waterproof and breathable valve 301 is a two-way gas permeable, one-way permeable structure.
  • the microscopic structure is a microporous structure.
  • the gas molecules and the liquid and dust particles are used in an order of magnitude to allow gas molecules to pass through, and liquid and dust cannot pass. Waterproof and breathable. It can ensure that the pressure inside the seal body is always balanced, zero pressure difference to the seal ring, and keep the seal body Dry, effectively achieve IP67 protection.

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  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

一种叶轮式机械水表流量计，包括下壳体(1)、下壳顶盖(2)、上壳底座(3)、上壳体(4)，上壳体(4)内安装显示模块(7)，下壳体(1)内安装叶轮计量模块(5)，上壳底座(3)与下壳顶盖(2)间安装传感模块(6)，下壳体(1)与下壳顶盖(2)间、下壳顶盖(2)与上壳底座(3)间、上壳底座(3)与上壳体(4)间分别设置密封圈(8,9,10)，并通过旋转卡扣(401)压缩密封圈(8,9,10)，形成多级密封，有效地保护了电路板(602)及下面的传感器，其防护等级达到IP67，通过定位结合件(403)的设计实现了对输出不锈钢线缆套管的固定、对上壳体(4)的旋转定位锁死，流量计整体无螺丝结构；叶轮(503)结构独特，运行平稳，始动流量低，量程比和测量灵敏度高；通过安装防水透气阀(301)，使密封体内、外压力保持平衡，实现仪器的长期防水保护。

Description

一种叶轮式无磁流量计 技术领域
本发明涉及一种水表流量计，具体涉及一种叶轮式无磁流量计。
背景技术
在当前智能水表应用实践中，无磁信号采样模式是水表采样最具优势的方式。但是，能否保证无磁流量计具有稳定的无磁信号采集、极小的始动流量和线性特性、具有较大的量程比和较高的灵敏度、超强的耐磨损性能和较长的使用寿命、流量计具备IP67的防护等级等系列问题，一直是困扰众多表厂的难题，有些甚至成为不可逾越的技术鸿沟。
现有技术的无磁水表，由于没有对转动叶轮进行优化设计，常常存在灵敏度低、耐磨性差、始动流量高、信号拾取不稳定等缺点；同时，由于水表壳体结构中存在多处螺丝设计，安装较为繁琐，且常常因达不到IP67防护等级而损坏；即使产品使用初期能够符合使用要求，但是在使用一段时间后，尤其是外界温度反复变化的情况下，密封圈受到含水气体压力差的冲击，水气会缓慢进入密封腔体内部，随着时间推移，腔内积聚湿气会越来越多，水表的内电路功能也容易受到影响。
发明内容
根据现有技术的不足，本发明提供了一种叶轮式无磁流量计，包括下壳体、下壳顶盖、上壳底座、上壳体；
所述下壳体内部安装有叶轮计量模块，叶轮计量模块随下壳体内流体流动而转动；下壳顶盖的中部与上壳底座的中部之间安装有传感模块，感应所述叶轮计量模块的转动并计数；上壳体内部安装有显示模块，与所述传感模块电连 接，并显示所述传感模块的计数；
所述下壳体与下壳顶盖之间压接有第一密封圈，下壳顶盖的中部与上壳底座的中部之间压接有第二密封圈，上壳底座与上壳体之间压接有第三密封圈。
本发明在使用时，待测流体通过下壳体流通，带动叶轮计量模块，传感模块对流量进行计量，并通过线缆传输，显示到显示模块上。
作为优选，所述传感模块包括LC传感器和与LC传感器电连接的PCB电路板，所述下壳顶盖的中部与上壳底座的中部之间形成用于安装所述LC传感器的空腔，所述下壳顶盖与下壳体的连接处形成限位结合面。由于限位结合面的存在，下壳顶盖安装到下壳体后，只能下压移动至限位结合面处，保证了下壳顶盖与下壳体的位置相对固定，同时，使处在不同腔室的传感模块与叶轮计量模块的距离相对固定，保证了无磁信号的稳定拾取。
作为优选，所述下壳体与上壳体的连接处设置有相适配的旋转卡扣，旋转卡扣旋紧固定时，上壳体与下壳体的对应位置处形成预设的定位结合槽，所述定位结合槽内安装与之相适配的定位结合件。通过旋转上壳体与下壳体相扣，压缩了上壳体和上壳底座间、上壳底座与下壳顶板间、下壳顶板与下壳体间的密封圈，形成三级密封，有效地保护了电路板及下面的传感器，其防护等级达到IP67；旋转卡扣替换了现有流量计的螺丝结构，连接更为紧密，且安装更加简单。
作为优选，所述定位结合件的中部穿设有不锈钢软管，不锈钢软管内设置线缆，所述线缆穿过上壳体、上壳底座，连接上壳体内部的PCB电路板；所述线缆与上壳底座的连接处设置有倒锥形橡胶堵塞。线缆用于各模块间的电连接，倒锥形橡胶堵塞与线缆紧密结合，可以起到防水作用。所述定位结合件在所述上壳体与下壳体相对旋转紧固后，可以插入所述上壳体和下壳体的对应位置处， 通过定位结合件的设计实现了对输出不锈钢线缆套管的固定、对上壳体的旋转定位锁死，实现了整体无螺丝卡扣结构。
作为优选，所述叶轮计量模块包括叶轮支撑轴、嵌套在叶轮支撑轴外的轴套、以轴套为中心呈放射状排布的叶轮以及嵌设在叶轮顶部的感应片。叶轮上部平面嵌入金属感应片，与其对应的下壳顶盖的中部与上壳底座的中部之间的空腔内上安装一对LC传感器。LC传感器与感应片间的距离保证在2.2mm以内，可保证无磁信号的稳定拾取。
传感模块产生LC振荡波形，当金属感应片移近传感器且距离在2.2mm之内时，按照法拉第电磁感应原理，金属感应片内产生涡流及感应电动势，用以抵消传感模块中原有的电动势，LC振荡波形幅值变低，而传感器模块中的检测电路可以检测到此幅值变化，从而计数。
LC传感器与感应片之间的距离应小于2.2mm。若距离大于2.2mm，则幅值变化量不足以被检测，计数会产生漏计的误差，流量计准确度降低；距离过大则直接导致流量计失灵。
作为优选，所述叶轮的密度小于水的密度，可略浮于水面，这样，在有微流量流动时，摩擦力降至最低，叶轮即可转动。经检测，本实施例的DN15流量计，始动流量可达到3L/h，由于此单流束口径的常用流量Q3为2500L/h(压损小于63kPa)，本实施例的检测精度在Q1可以满足国家水表精度要求的+-5％时，稳定的小流量为8L/h，因此本实施例的量程比为R＝常用流量/稳定小流量≥250；计量灵敏度达到0.01ml，可以解决流量计微始动流量及大里程比的问题。
作为优选，所述叶轮支撑轴为耐磨陶瓷轴，使用寿命较长，实验证明其使用寿命为普通机械式水表的2-3倍。
作为优选，所述轴套与叶轮支撑轴的接触支点在所述叶轮支撑轴的上部， 将接触支点设计在叶轮高部，降低叶轮重心，保障叶轮运行平稳，提高叶轮运转的规律性和复线性；叶轮顶端打破以往有上固定轴的规则，采用镶嵌球体作为转动的浮动自由定位，这种定位的作用是在流量计安装略偏离水平状态时，叶轮自动调节状态，使摩擦力降至最低，保证流量特性的线性规律。
作为优选，所述上壳体内部包括PVC标贴、用于固定PVC标贴的PVC支架、用于显示的LCD显示屏、与LCD显示屏电连接的PCB电路板以及用于定位PCB电路板的PCB支架。通过旋转上壳体与下壳体相扣，可使PCB支架压紧、定位PCB，防止PCB和传感器移动，使传感器与感应片的距离保持在2.2mm以内，保证了信号的稳定拾取；PVC支架和PVC标贴可以用于显示产品规格等相应文字或符号。
作为优选，所述上壳底座上贯穿安装有防水透气阀，起到使电路盒与外界联通的作用。防水透气阀为双向透气、单向透水的结构，微观下是微孔状结构，利用气体分子与液体及灰尘颗粒的体积大小数量级差，让气体分子通过，而液体、灰尘无法通过，从而实现防水透气的目的。即使外界温差较大，温度反复变化，也能保证密封体内、外压力始终保持平衡，对密封圈产生零压差，有效实现IP67防护等级。
本发明的叶轮式无磁流量计，具有如下优点：
(1)通过设计多级密封圈，实现了流量计的多级防水密封；
(2)整体设计紧凑、巧妙，在无螺丝固定的情况下，通过旋转定位的方式实现多级密封，完成了对电路和传感器的IP67防护；
(3)叶轮结构独特，运行平稳，始动流量低，量程比和测量灵敏度高；
(4)通过安装防水透气阀，使密封体内、外压力保持平衡，实现仪器的长期IP67保护。
附图说明
图1为本发明的整体结构一角度剖面示意图；
图2为本发明的整体结构另一角度剖面示意图；
图3为本发明的A部分结构放大示意图；
图4为本发明的B部分结构放大示意图；
图5为本发明的定位结合件局部装配示意图；
图6为本发明的叶轮结构立体示意图；
图7为本发明的叶轮结构剖面示意图；
图8为本发明的C部分结构放大示意图；
图9为本发明的整体结构装配示意图。
图中，1：下壳体，2：下壳顶盖，3：上壳底座，4：上壳体，5：叶轮计量模块，6：传感模块，7：显示模块，8：第一密封圈，9：第二密封圈，10：第三密封圈，101：进液口，102：出液口，103：限位结合面，301：防水透气阀，302：线缆，303：橡胶堵塞，304：不锈钢软管，401：旋转卡扣，402：定位结合槽，403：定位结合件，404：PVC标贴，405：PVC支架，501：叶轮支撑轴，502：轴套，503：叶轮，504：感应片，601：LC传感器，602：PCB电路板，603：PCB支架，701：LCD显示屏。
具体实施方式
以下结合附图和实施例对本发明作进一步说明。
如图1-3所示，本实施例的叶轮式无磁流量计，包括下壳体1、下壳顶盖2、上壳底座3、上壳体4；
所述下壳体1内部安装有叶轮计量模块5，叶轮计量模块5随下壳体1内流体的流动而转动；下壳顶盖2的中部与上壳底座3的中部之间安装有传感模块6，传感模块6用于感应所述流量计量模块5的转动并计数；上壳体4内部安装有 显示模块7，与所述传感模块6电连接，并显示所述传感模块6的计数；
所述下壳体1与下壳顶盖2之间压接有第一密封圈8，下壳顶盖2的中部与上壳底座3的中部之间压接有第二密封圈9，上壳底座3与上壳体4之间压接有第三密封圈10，第一密封圈8、第二密封圈9、第三密封圈10均为具有一定弹性的橡胶密封圈，使下壳体1与下壳顶盖2、下壳顶盖2的中部与上壳底座3、上壳底座3与上壳体4之间实现弹性压接和密封。
使用时，待测流体由进液口101流入，通过下壳体1流通，带动叶轮计量模块5，并由出液口102流出，传感模块6对流量进行计量，并通过线缆传输，显示到显示模块7上。
如图4、5所示，所述下壳体1与上壳体4的连接处设置有相适配的旋转卡扣401，旋转卡扣401旋紧固定时，上壳体1与下壳体4的对应位置处形成预设的定位结合槽402，所述定位结合槽402内安装与之相适配的定位结合件403。通过旋转上壳体4与下壳体1相扣，压缩了上壳体4和上壳底座3间、上壳底座3与下壳顶板2、下壳顶板2与下壳体间的密封圈，形成三级密封，有效地保护了电路板及下面的传感器，其防护等级达到IP67；替换了现有流量计的螺丝结构，连接更为紧密，且安装更加简单。
所述定位结合件403的中部穿设有不锈钢软管304，不锈钢软管304内设置线缆302，所述线缆302穿过上壳体4、上壳底座3，连接上壳体4内部的PCB电路板602；所述线缆302与上壳底座3的连接处设置有倒锥形橡胶堵塞303。线缆302用于各模块间的电连接，倒锥形橡胶堵塞303与线缆302紧密结合，可以起到防水作用。所述定位结合件403在所述上壳体4与下壳体1相对旋转紧固后，可以插入所述上壳体4和下壳体1的对应位置处，通过定位结合件403的设计实现了对输出不锈钢软管304的固定、对上壳体4的旋转定位锁死，实 现了流量计整体无螺丝结构。
如图6、7所示，所述传感模块6包括LC传感器601和与LC传感器601电连接的PCB电路板602，所述下壳顶盖2的中部与上壳底座3的中部之间形成用于安装所述LC传感器601的空腔，所述下壳顶盖2与下壳体1的连接处形成限位结合面103。由于限位结合面103的存在，下壳顶盖2安装到下壳体1后，只能下压移动至限位结合面103处，保证了下壳顶盖2与下壳体1的位置相对固定，同时，使传感模块6与叶轮计量模块5的距离相对固定，保证了无磁信号的稳定拾取。
所述叶轮计量模块5包括叶轮支撑轴501、嵌套在叶轮支撑轴501外的轴套502、以轴套502为中心呈放射状排布的叶轮503以及嵌设在叶轮503顶部的感应片504。叶轮503上部平面嵌入金属感应片504，与其对应的下壳顶盖2的中部与上壳底座3的中部之间的空腔内上安装一对LC传感器601。本实施例中的LC传感器601与感应片504间的距离保证在2.2mm以内，可保证无磁信号的稳定拾取。
传感模块6产生LC振荡波形，当金属感应片504移近LC传感器601且距离在2.2mm之内时，按照法拉第电磁感应原理，金属感应片504内产生涡流及感应电动势，用以抵消传感模块6中原有的电动势，LC振荡波形幅值变低，而传感器模块6中的检测电路可以检测到此幅值变化，从而计数。
LC传感器601与感应片504之间的距离应小于2.2mm。若距离大于2.2mm，则幅值变化量不足以被检测，计数会产生漏计的误差，流量计准确度降低；距离过大则直接导致流量计失灵。
所述叶轮503的密度小于水的密度，可略浮于水面，这样，在有微流量流动时，摩擦力降至最低，叶轮即可转动。经检测，本实施例的流量计，始动流 量可达到3L/h，由于单流束口径的常用流量为2000L/h，因此本实施例的检测精度可以满足国家水表精度要求的+-5％；稳定的小流量为8L/h，因此本实施例的量程比为R＝常用流量/稳定小流量＝250；计量灵敏度达到0.01ml，可以解决流量计微始动流量及大里程比的问题。
所述叶轮支撑轴501为耐磨陶瓷轴，使用寿命较长，为普通机械式水表的2-3倍。
所述轴套502与叶轮支撑轴501的接触支点在所述叶轮支撑轴501的上部，将接触支点设计在叶轮503高部，降低叶轮503重心，保障叶轮503运行平稳，提高叶轮503运转的规律性和复线性，可将量程比提高至R250；叶轮503顶端打破以往有上固定轴的规则，采用镶嵌球体作为转动的浮动自由定位，这种定位的作用是在流量计安装略偏离水平状态时，叶轮503自动调节状态，使摩擦力降至最低，保证流量特性的线性规律。
如图8所示，所述上壳体4内部包括PVC标贴404、用于固定PVC标贴404的PVC支架405、用于显示的LCD显示屏701、与LCD显示屏701电连接的PCB电路板602以及用于定位PCB电路板602的PCB支架603。通过通过旋转上壳体4与下壳体1相扣，可使PCB支架603压紧、定位PCB，防止PCB和传感器移动，使传感器与感应片的距离保持在2.2mm以内，保证了信号的稳定拾取；PVC支架405和PVC标贴404可以用于显示产品规格等相应文字或符号。
如图9所示，所述上壳底座3上贯穿安装有防水透气阀301，起到使内部电路与外界空气连通的作用。防水透气阀301为双向透气、单向透水的结构，微观下是微孔状结构，利用气体分子与液体及灰尘颗粒的体积大小数量级差，让气体分子通过，而液体、灰尘无法通过，从而实现防水透气的目的。它可以保证密封体内、外压力始终保持平衡，对密封圈产生零压差，并保持密封体内的 干燥，有效实现IP67防护等级。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明，对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的。
应当理解的是，本申请旨在涵盖本实用新型的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本发明的一般性原理并包括本发明未公开的本技术领域中的公知常识或惯用技术手段。

Claims (10)

  1. 一种叶轮式无磁流量计，其特征在于：
    包括下壳体、下壳顶盖、上壳底座、上壳体；
    所述下壳体内部安装有叶轮计量模块，叶轮计量模块随下壳体内流体的流动而转动；下壳顶盖的中部与上壳底座的中部之间安装有传感模块，传感模块用于感应所述叶轮计量模块的转动并计数；上壳体内部安装有显示模块，与所述传感模块电连接，并显示所述传感模块的计数；
    所述下壳体与下壳顶盖间压接有第一密封圈，下壳顶盖的中部与上壳底座的中部之间压接有第二密封圈，上壳底座与上壳体之间压接有第三密封圈。
  2. 如权利要求1所述的一种叶轮式无磁流量计，其特征在于：所述传感模块包括LC传感器和与LC传感器电连接的PCB电路板，所述下壳顶盖的中部与上壳底座的中部之间形成用于安装所述LC传感器的空腔，所述下壳顶盖与下壳体的连接处形成限位结合面。
  3. 如权利要求2所述的一种叶轮式无磁流量计，其特征在于：所述下壳体与上壳体的连接处设置有相适配的旋转卡扣，旋转卡扣旋紧固定时，所述上壳体与下壳体的对应位置处形成预设的定位结合槽，所述定位结合槽内安装与之相适配的定位结合件。
  4. 如权利要求3所述的一种叶轮式无磁流量计，其特征在于：所述定位结合件的中部穿设有不锈钢软管，不锈钢软管内设置线缆，所述线缆穿过上壳体、上壳底座，连接上壳体内部的PCB电路板；所述线缆与上壳底座的连接处设置有倒锥形橡胶堵塞。
  5. 如权利要求1-4中任一项所述的一种叶轮式无磁流量计，其特征在于：所述叶轮计量模块包括叶轮支撑轴、嵌套在叶轮支撑轴外的轴套、以轴套为中心呈放射状排布的叶轮以及嵌设在叶轮顶部的感应片。
  6. 如权利要求5所述的一种叶轮式无磁流量计，其特征在于：所述叶轮的密度小于水的密度。
  7. 如权利要求6所述的一种叶轮式无磁流量计，其特征在于：所述叶轮支撑轴为耐磨陶瓷轴。
  8. 如权利要求7所述的一种叶轮式无磁流量计，其特征在于：所述叶轮与叶轮支撑轴的接触支点在所述叶轮支撑轴的上部。
  9. 如权利要求1-8中任一项所述的一种叶轮式无磁流量计，其特征在于：所述上壳体内部包括PVC标贴、用于固定PVC标贴的PVC支架、用于显示的LCD显示屏、与LCD显示屏电连接的PCB电路板以及用于定位PCB电路板的PCB支架。
  10. 如权利要求1-9中任一项所述的一种叶轮式无磁流量计，其特征在于：所述上壳底座上贯穿安装有防水透气阀。
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