CN108225444A - A kind of shaftless liquid turbine flowmeter with self-powered gauge outfit - Google Patents
A kind of shaftless liquid turbine flowmeter with self-powered gauge outfit Download PDFInfo
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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
- G01F1/20—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 by detection of dynamic effects of the flow
- G01F1/32—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 by detection of dynamic effects of the flow using swirl flowmeters
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Abstract
本发明公开了一种带自供电表头的无轴液体涡轮流量计，包括外壳体、内壳体和表头，所述内壳体同轴安装在外壳体内，内壳体和外壳体之间形成相对自由转动副，外壳体和内壳体设有用于进出流体且同轴设置的第一端口和第二端口，内壳体内设有无轴叶轮，内壳体外表面设有磁铁，外壳体内设有能切割该磁铁磁感线的线圈，所述线圈通过导线接入表头内，所述表头包括转换电路，所述转换电路用于将线圈的感应电流转换为可测电势以及为表头供电，通过测量线圈的感应电流电势测量流体流量大小。本发明使用对称式无轴叶轮，对流体没有流向的限制，使得流体流动的阻力变小，测得更加精确；电磁感应产生电流还可对表头供电，无需对表头外加电源。
The invention discloses a shaftless liquid turbine flowmeter with a self-powered meter head, which comprises an outer casing, an inner casing and a meter head, the inner casing is coaxially installed in the outer casing, and the inner casing and the outer casing are installed A relatively free rotating pair is formed. The outer casing and the inner casing are provided with a first port and a second port coaxially arranged for fluid in and out. The inner casing is provided with a shaftless impeller, the outer surface of the inner casing is provided with magnets, and the outer casing is provided with a There is a coil that can cut the magnetic induction line of the magnet, and the coil is connected to the meter head through a wire, and the meter head includes a conversion circuit, and the conversion circuit is used to convert the induced current of the coil into a measurable potential and provide the meter head Power supply, measure the fluid flow by measuring the induced current potential of the coil. The invention uses a symmetrical shaftless impeller, which has no restriction on the flow direction of the fluid, so that the resistance of the fluid flow is reduced and the measurement is more accurate; the current generated by electromagnetic induction can also supply power to the meter head, without adding an external power supply to the meter head.
Description
技术领域technical field
本发明属于计量器具领域，涉及一种液体流量计，具体涉及一种带自供电表头的无轴液体涡轮流量计。The invention belongs to the field of measuring instruments, and relates to a liquid flowmeter, in particular to a shaftless liquid turbine flowmeter with a self-powered meter head.
背景技术Background technique
(1)液体涡轮流量计的特点(1) Characteristics of liquid turbine flowmeter
液体涡轮流量计是一种速度型计量仪表，具有测量精度高、反应速度快、测量范围广、压力损失小、流量量程比宽、准确度高、抗振和抗脉动流性能好、价格低廉、安装方便等优点，被广泛应用于工业生产中。液体涡轮流量计普遍应用于石油、化工、电力、建筑给排水、中央空调等领域，并也被普遍应用于贸易计量。对于液体涡轮流量计来说，提升其品质是至关重要的。Liquid turbine flowmeter is a speed-type measuring instrument with high measurement accuracy, fast response speed, wide measurement range, small pressure loss, wide flow range ratio, high accuracy, good anti-vibration and anti-pulsation flow performance, low price, It is widely used in industrial production due to the advantages of convenient installation. Liquid turbine flowmeters are widely used in petroleum, chemical industry, electric power, building water supply and drainage, central air conditioning and other fields, and are also widely used in trade measurement. For liquid turbine flowmeters, improving its quality is crucial.
(2)液体涡轮流量计的工作原理(2) Working principle of liquid turbine flowmeter
液体涡轮流量计是一种速度式流量仪表，它以动量守恒原理为基础。流体冲击叶轮，使叶轮旋转，叶轮的旋转速度随流量的变化而变化，根据叶轮转速求出流量值。当被测流体通过流量计时，流体通过整流器后冲击叶轮叶片，由于叶轮叶片与流体流向之间有一倾斜角，流体的冲击力对叶轮产生转动力矩，使叶轮克服机械摩擦阻力矩而转动，其旋转速度与被测量流体体积流量近似成比例。The liquid turbine flowmeter is a velocity flow meter, which is based on the principle of conservation of momentum. The fluid impacts the impeller, causing the impeller to rotate, and the rotation speed of the impeller changes with the change of the flow rate, and the flow value is calculated according to the impeller speed. When the fluid to be measured passes through the flowmeter, the fluid impacts the impeller blades after passing through the rectifier. Since there is an inclination angle between the impeller blades and the flow direction of the fluid, the impact force of the fluid generates a rotational torque on the impeller, which makes the impeller rotate against the mechanical frictional resistance torque. Velocity is approximately proportional to measured fluid volume flow.
通过液体涡轮流量计的流体体积的测量是基于叶轮的旋转数得到的，主要是运用磁电转换装置或者机械输出装置将叶轮旋转数转化成电脉冲，送入涡轮流量计的二次仪表进行计算和显示，由单位时间电脉冲数和累计电脉冲数反映出被测流体介质的瞬时流量和累计流量。The measurement of fluid volume through the liquid turbine flowmeter is based on the number of rotations of the impeller, mainly by using a magnetoelectric conversion device or a mechanical output device to convert the number of rotations of the impeller into electrical pulses, which are sent to the secondary instrument of the turbine flowmeter for calculation And display, the instantaneous flow and cumulative flow of the measured fluid medium are reflected by the number of electrical pulses per unit time and the cumulative number of electrical pulses.
(3)液体涡轮流量计使用中应该注意的一些问题和发展前景(3) Some problems and development prospects that should be paid attention to in the use of liquid turbine flowmeters
在安装液体涡轮流量计时，应该保证前后管道的法兰水平，否则管道压力对流量计测量准确度影响很大；在使用液体涡轮流量计时，如果被测介质中有杂质，可能会导致涡轮、轴承被卡住，会对叶轮有损伤，甚至测不出流量，此时应该在直管段前还应该装过滤器；现阶段使用的液体涡轮流量计对流体的流向有限制，在安装过程中，必须保证流体的流动方向与仪表外壳的箭头方向一致；被测介质对叶轮不能有腐蚀，特别是轴承处，应该采取保护措施；注意对磁感应部分不能碰撞。When installing a liquid turbine flowmeter, you should ensure that the flanges of the front and rear pipelines are level, otherwise the pipeline pressure will have a great impact on the measurement accuracy of the flowmeter; when using a liquid turbine flowmeter, if there are impurities in the measured medium, it may cause the turbine, bearing If it is stuck, it will damage the impeller, and even the flow cannot be measured. At this time, a filter should be installed before the straight pipe section; the liquid turbine flowmeter currently used has restrictions on the flow direction of the fluid. During the installation process, it must Ensure that the flow direction of the fluid is consistent with the direction of the arrow on the instrument casing; the measured medium cannot corrode the impeller, especially the bearing, and protective measures should be taken; pay attention not to collide with the magnetic induction part.
随着计量事业的快速发展和工业化进程的加快，目前市场上现有的计量产品已难以满足测量工作的需要，液体涡轮流量计已逐渐向小型化、高集成度的模块方向发展，必须要大力提高液体涡轮流量计计量的准确性和使用范围。With the rapid development of the metering industry and the acceleration of the industrialization process, the existing metering products on the market can no longer meet the needs of the measurement work. The liquid turbine flowmeter has gradually developed towards a miniaturized and highly integrated module. Improve the measurement accuracy and application range of the liquid turbine flowmeter.
现在的技术中，用于提高液体涡轮流量计的准确性的技术主要从涡轮流量计内部结构和表头的优化，这两方面着手。比如，涡轮流量计内涡轮的叶片数的优化、涡轮叶片的叶间顶隙的优化、涡轮叶片倾斜角的优化、前后整流器长度的优化、前后整流器角度的优化、涡轮流量计表头内部算法的优化等等。In the current technology, the technology used to improve the accuracy of the liquid turbine flowmeter mainly starts from the optimization of the internal structure of the turbine flowmeter and the meter head. For example, the optimization of the number of blades of the turbine in the turbine flowmeter, the optimization of the top clearance between the turbine blades, the optimization of the inclination angle of the turbine blades, the optimization of the length of the front and rear rectifiers, the optimization of the angle of the front and rear rectifiers, and the optimization of the internal algorithm of the turbine flowmeter head. optimization and more.
这些优化技术在一定程度上减小了流体在流动过程中的阻力、提高了涡轮流量计测量的精确度，但是却没有实现对流量计小型化、集成化的设计。These optimization techniques have reduced the resistance of the fluid in the flow process to a certain extent and improved the measurement accuracy of the turbine flowmeter, but they have not realized the miniaturization and integration of the flowmeter design.
因此，需要一种新型的液体涡轮流量计，既能实现对流体流动阻力的减小、进而提高涡轮流量计的测量精度，又能实现流量计的小型化和集成化。Therefore, there is a need for a new type of liquid turbine flowmeter, which can not only reduce the fluid flow resistance, thereby improve the measurement accuracy of the turbine flowmeter, but also realize the miniaturization and integration of the flowmeter.
发明内容Contents of the invention
有鉴于此，本发明的目的在于提供一种新型的带自供电表头的无轴液体涡轮流量计，达到减小流体流动阻力、提高测量精度的目的，并向小型化、集成化靠拢。In view of this, the object of the present invention is to provide a new type of shaftless liquid turbine flowmeter with a self-powered meter head, to achieve the purpose of reducing fluid flow resistance, improving measurement accuracy, and approaching miniaturization and integration.
为了解决上述技术问题，本发明采用的技术方案是：In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
一种带自供电表头的无轴液体涡轮流量计，其特征在于：包括外壳体、内壳体和表头，所述内壳体同轴安装在外壳体内，内壳体和外壳体之间形成相对自由转动副，外壳体和内壳体设有用于进出流体且同轴设置的第一端口和第二端口，内壳体内设有无轴叶轮，内壳体外表面设有磁铁，外壳体内设有能切割该磁铁磁感线的线圈，所述线圈通过导线接入表头内，所述表头包括转换电路，所述转换电路用于将线圈的感应电流转换为可测电势以及为表头供电，通过测量线圈的感应电流电势测量流体流量大小。A shaftless liquid turbine flowmeter with a self-powered meter head is characterized in that it includes an outer casing, an inner casing and a meter head, the inner casing is coaxially installed in the outer casing, and the inner casing and the outer casing A relatively free rotating pair is formed. The outer casing and the inner casing are provided with a first port and a second port coaxially arranged for fluid in and out. The inner casing is provided with a shaftless impeller, the outer surface of the inner casing is provided with magnets, and the outer casing is provided with a There is a coil that can cut the magnetic induction line of the magnet, and the coil is connected to the meter head through a wire, and the meter head includes a conversion circuit, and the conversion circuit is used to convert the induced current of the coil into a measurable potential and serve as the meter head Power supply, measure the fluid flow by measuring the induced current potential of the coil.
作为改进，所述内壳体是通过一对圆锥滚子轴承安装在外壳体内，内壳体两端分别设有一个对圆锥滚子轴承内侧定位的凸台，外壳体两端分别设有一个对圆锥滚子轴承外侧止推的定位环。As an improvement, the inner housing is installed in the outer housing through a pair of tapered roller bearings, and two ends of the inner housing are respectively provided with a boss for positioning the inner side of the tapered roller bearings, and two ends of the outer housing are respectively provided with a pair of Locating ring for the outer thrust of tapered roller bearings.
作为改进，所述无轴叶轮为均布在内壳体内表面的一组叶轮。As an improvement, the shaftless impeller is a group of impellers uniformly distributed on the inner surface of the inner casing.
作为改进，所述线圈为设置在外壳体内表面的矩形线圈。As an improvement, the coil is a rectangular coil arranged on the inner surface of the casing.
作为改进，所述矩形线圈在外壳体上覆盖面小于360°。As an improvement, the coverage of the rectangular coil on the outer shell is less than 360°.
作为改进，所述无轴叶轮为进出对称型叶轮，第一端口和第二端口作为流体流过内壳体的进出口可以互换。As an improvement, the shaftless impeller is an inlet-outlet symmetrical impeller, and the first port and the second port can be interchanged as the inlet and outlet for the fluid to flow through the inner casing.
作为改进，第一端口和第二端口处的外壳体端部分别设有与待测流体管道相连的法兰。As an improvement, the ends of the outer shell at the first port and the second port are respectively provided with flanges connected with the fluid pipeline to be tested.
作为改进，上述线圈产生的感应电流为交流，所述转换电路为将交流变直流的桥式整流电路。As an improvement, the induction current generated by the coil is AC, and the conversion circuit is a bridge rectifier circuit for converting AC to DC.
作为改进，在桥式整流电路后面设有一个具有放大功能的三极管，通过三极管将电动势放大以便于更精确地转化为流量读数。As an improvement, a triode with amplification function is provided behind the bridge rectifier circuit, and the electromotive force is amplified through the triode so that it can be converted into flow readings more accurately.
作为改进，所述表头内还包括读数显示器，测量线圈的感应电流电势测量流体流量大小通过读数显示器就地显示。As an improvement, the meter head also includes a reading display, and the flow rate of the fluid measured by the induced current potential of the measuring coil is displayed on the spot through the reading display.
本发明的有益效果是：The beneficial effects of the present invention are:
本发明的带自供电表头的无轴液体涡轮流量计，内壳体通过一对圆锥滚子轴承支承，内外壳体也通过这对圆锥滚子轴承保证同轴度，由于圆锥滚子的力学特性，所以无论流体从哪一个入口流入壳体，涡轮的受力都不会在大小上发生变化，即不会影响流体流量的测量，所以本发明的带自供电表头的无轴液体涡轮流量计对流体没有流向的限制。In the shaftless liquid turbine flowmeter with self-powered meter head of the present invention, the inner casing is supported by a pair of tapered roller bearings, and the inner and outer casings also ensure the coaxiality through the pair of tapered roller bearings. characteristics, so no matter from which inlet the fluid flows into the casing, the force of the turbine will not change in size, that is, it will not affect the measurement of the fluid flow, so the shaftless liquid turbine flow rate with self-powered meter head of the present invention The meter has no restriction on the flow direction of the fluid.
本发明中设计了一种新的无轴式叶轮，叶轮直接通过加工附着在内壳体的内表面，不影响其工作原理，但是由于没有了传统的涡轮流量计中连接涡轮叶片的涡轮轴，使得流体流动的的阻力变小，测得的流量更加精确；本发明中，在一对密封良好的圆锥滚子轴承中设置磁铁和线圈，其中磁铁设置在内壳体外表面(均匀散布的两片弧形磁铁)，线圈设置在外壳体内表面(占小于360°圆周角的弧形缠绕线圈)，通过涡轮的转动带动内壳体的转动，从而使得内壳体上的磁铁相对于外壳体的线圈发生相对转动，产生电磁感应现象，产生感应电动势，经过处理之后通过表头显示出来，无需对表头外加电源。In the present invention, a new shaftless impeller is designed. The impeller is directly attached to the inner surface of the inner casing through machining, which does not affect its working principle. However, since there is no turbine shaft connecting the turbine blades in the traditional turbine flowmeter, The resistance to fluid flow becomes smaller, and the measured flow rate is more accurate; in the present invention, magnets and coils are arranged in a pair of well-sealed tapered roller bearings, wherein the magnets are arranged on the outer surface of the inner shell (two pieces evenly distributed Arc-shaped magnet), the coil is arranged on the inner surface of the outer shell (an arc-shaped winding coil occupying less than 360°circumferential angle), and the rotation of the turbine drives the rotation of the inner shell, so that the magnet on the inner shell is relative to the coil of the outer shell Relative rotation occurs, electromagnetic induction phenomenon is generated, and induced electromotive force is generated, which is displayed through the meter head after processing, without external power supply to the meter head.
本发明的一种新型带自供电表头的无轴液体涡轮流量计，舍去了传统的涡轮流量计中的整流器，使得结构更加紧凑，同时也避免了流体流过整流器叶片形成的阻力；设计发明了一种无轴涡轮，减小了流体流动的阻力，提高了测量精度。本发明将电磁感应产生的电动势经过处理用于读数显示器(表头)的供电和计数，无需外加电源，体现了集成化的思想。A new type of shaftless liquid turbine flowmeter with a self-powered meter head of the present invention discards the rectifier in the traditional turbine flowmeter, making the structure more compact, and at the same time avoiding the resistance caused by the fluid flowing through the rectifier blades; design Invented a shaftless turbine, which reduces the resistance of fluid flow and improves the measurement accuracy. In the present invention, the electromotive force generated by electromagnetic induction is processed for power supply and counting of the reading display (meter head), without external power supply, and embodies the idea of integration.
附图说明Description of drawings
下面结合附图对本发明进一步描述。The present invention will be further described below in conjunction with the accompanying drawings.
图1为带自供电表头的无轴液体涡轮流量计结构示意图。Figure 1 is a schematic structural diagram of a shaftless liquid turbine flowmeter with a self-powered meter head.
图2为无轴液体涡轮流量计横断截面线圈与磁铁的分布示意图。Fig. 2 is a schematic diagram of the distribution of coils and magnets in the cross section of the shaftless liquid turbine flowmeter.
图中，1-外壳体，2-表头，3-导线，4-圆锥滚子轴承，5-内壳体，6-磁铁，7-线圈，8-无轴叶轮，9-定位环，10-第一端口，11-第二端口。In the figure, 1-outer shell, 2-head, 3-wire, 4-tapered roller bearing, 5-inner shell, 6-magnet, 7-coil, 8-shaftless impeller, 9-locating ring, 10 - first port, 11 - second port.
具体实施方式Detailed ways
下面结合附图对本发明进一步描述。The present invention will be further described below in conjunction with the accompanying drawings.
如图1和图2所示，一种带自供电表头的无轴液体涡轮流量计，包括外壳体1、内壳体5和表头2，本实施例中，外壳体1和内壳体5均为圆柱状壳体，所述内壳体5通过一对圆锥滚子轴承4同轴安装在外壳体1内，内壳体5和外壳体1之间形成相对自由转动副，外壳体1和内壳体5设有用于进出流体且同轴设置的第一端口10和第二端口11，内壳体5内设有无轴叶轮8，具体为：内壳体5内表面通过加工，固定上一组叶轮，使得叶轮的根部与内壳体5内表面形成一体，这样就形成了一个无轴的涡轮；内壳体5外表面设有磁铁6，外壳体1内设有能切割该磁铁6磁感线的线圈7，所述线圈7通过导线3接入表头2内，所述表头2包括转换电路，所述转换电路用于将线圈7的感应电流转换为可测电势以及为表头2供电，通过测量线圈7的感应电流电势测量通过内壳体5的流体流量大小。As shown in Figures 1 and 2, a shaftless liquid turbine flowmeter with a self-powered meter head includes an outer casing 1, an inner casing 5, and a meter head 2. In this embodiment, the outer casing 1 and the inner casing 5 are cylindrical shells, the inner shell 5 is coaxially installed in the outer shell 1 through a pair of tapered roller bearings 4, a relatively free rotation pair is formed between the inner shell 5 and the outer shell 1, and the outer shell 1 The inner housing 5 is provided with a first port 10 and a second port 11 coaxially arranged for fluid in and out, and the inner housing 5 is provided with a shaftless impeller 8, specifically: the inner surface of the inner housing 5 is processed and fixed The upper set of impellers makes the root of the impeller integrated with the inner surface of the inner casing 5, thus forming a shaftless turbine; the outer surface of the inner casing 5 is provided with a magnet 6, and the outer casing 1 is provided with a magnet that can cut the magnet. 6. The coil 7 of the magnetic induction line, the coil 7 is connected in the meter head 2 through the wire 3, and the meter head 2 includes a conversion circuit, and the conversion circuit is used for converting the induced current of the coil 7 into a measurable potential and for The meter head 2 is powered, and the fluid flow through the inner casing 5 is measured through the induced current potential of the measuring coil 7 .
作为一种更优实施例，内壳体5两端分别设有一个对圆锥滚子轴承4内侧定位的凸台，具体为内壳体5外表面加工出了一个薄凸台，外壳体1两端分别设有一个对圆锥滚子轴承4外侧止推的定位环9，定位环9外表面带有螺纹。通过螺纹连接的方式与外壳体1连接，与内壳体5上的凸台一起作用，起到定位圆锥滚子轴承4的作用。As a more optimal embodiment, two ends of the inner housing 5 are respectively provided with a boss positioned on the inner side of the tapered roller bearing 4, specifically, a thin boss is processed on the outer surface of the inner housing 5, and the outer housing 1 is two The ends are respectively provided with a locating ring 9 that thrusts against the outside of the tapered roller bearing 4, and the outer surface of the locating ring 9 is threaded. It is connected with the outer casing 1 through threaded connection, and works together with the boss on the inner casing 5 to position the tapered roller bearing 4 .
作为一种更优实施例，所述线圈7为设置在外壳体1内表面的矩形线圈，该线圈7通过加工附着在外壳体1内表面。为了不出现在磁铁6切割磁感线是磁通量无变化的情况，所述矩形线圈7在外壳体1上覆盖面小于360°，具体本实施例最优的为180°，具体分布情况如图2所示，线圈7的匝数按照使得电磁感应现象尽量强烈的匝数取值。As a more preferred embodiment, the coil 7 is a rectangular coil arranged on the inner surface of the outer casing 1 , and the coil 7 is attached to the inner surface of the outer casing 1 through processing. In order not to occur when the magnet 6 cuts the magnetic induction line and the magnetic flux does not change, the coverage of the rectangular coil 7 on the outer casing 1 is less than 360°, and the specific embodiment is optimally 180°. The specific distribution is shown in Figure 2 As shown, the number of turns of the coil 7 is selected according to the number of turns that makes the electromagnetic induction phenomenon as strong as possible.
作为一种更优实施例，所述无轴叶轮8为进出对称型叶轮，第一端口10和第二端口11作为流体流过内壳体5的进出口可以互换。As a more preferred embodiment, the shaftless impeller 8 is an inlet-outlet symmetrical impeller, and the first port 10 and the second port 11 can be interchanged as the inlet and outlet for the fluid to flow through the inner casing 5 .
作为一种更优实施例，第一端口10和第二端口11处的外壳体1端部分别设有与待测流体管道相连的法兰。As a more preferred embodiment, the ends of the outer housing 1 at the first port 10 and the second port 11 are respectively provided with flanges connected with the fluid pipelines to be tested.
作为一种更优实施例，上述线圈7产生的感应电流为正弦波电流的交流电，所述转换电路为交变直的整流电路。所述整流电路可以为二极管半波整流电路或桥式整流电路，比如二极管半波整流电路为一对并联的二极管，两个并联的二极管的安装方向相反，以保证产生的电动势能全部通过电路，更优的在整流电路后面设有一个具有放大功能的三极管，通过三极管将电动势放大以便于更精确地转化为流量读数。所述表头2内还包括读数显示器，测量线圈7的感应电流电势测量流体流量大小通过读数显示器就地显示。As a more preferred embodiment, the induction current generated by the coil 7 is an alternating current of sine wave current, and the conversion circuit is an alternating and direct rectifying circuit. The rectifier circuit can be a diode half-wave rectifier circuit or a bridge rectifier circuit. For example, the diode half-wave rectifier circuit is a pair of parallel diodes, and the installation directions of the two parallel diodes are opposite to ensure that all generated electromotive potential energy passes through the circuit. More preferably, there is a triode with amplification function behind the rectification circuit, and the electromotive force is amplified by the triode so as to convert it into a flow reading more accurately. The meter head 2 also includes a reading display, and the flow rate of the fluid measured by the induced current potential of the measuring coil 7 is displayed on the spot through the reading display.
作为一种更优实施例，本发明的磁铁6为永磁体，该磁铁6通过加工，附着在内壳体5的外表面。此处采用两块弧形磁铁，这两块磁铁6均匀分布在内壳体5外表面。具体分布情况如图2所示，两块弧形磁铁的圆周角不定，按照使得电磁感应现象尽量强烈的圆周角取值。As a more preferred embodiment, the magnet 6 of the present invention is a permanent magnet, and the magnet 6 is attached to the outer surface of the inner casing 5 through processing. Here, two arc-shaped magnets are used, and the two magnets 6 are evenly distributed on the outer surface of the inner casing 5 . The specific distribution is shown in Figure 2. The circumferential angles of the two arc-shaped magnets are not fixed, and the values of the circumferential angles that make the electromagnetic induction phenomenon as strong as possible are selected.
本发明测量原理，流体流动过程中冲击叶轮，带动内壳体5旋转，由于内壳体5上设有磁铁6，因此产生励磁效应，设于外壳体1上的线圈7切割磁感线产生感应电流，流体流量越大，叶轮转动越快，那么磁通量变化就越快，线圈7产生的感应电流也就越大，利用这个原理，测得感应电流的电势大小即可测得通过叶轮的流体流量大小，为了便于测量还设置了转换电路，将交流转换为直流，便于测量电压，然后通过放大器进行放大，增加测量准确性，另外更重要的是该感应电流还可以给表头2供电，从而可以适应无源场合测量，另外还可以设置蓄电池，这样可以适应流量大小变动剧烈的无源场合。The measurement principle of the present invention is that the impeller is impacted during the fluid flow, and the inner casing 5 is driven to rotate. Since the inner casing 5 is provided with a magnet 6, an excitation effect is generated, and the coil 7 arranged on the outer casing 1 cuts the magnetic induction line to generate induction. Current, the greater the fluid flow, the faster the impeller rotates, the faster the magnetic flux changes, and the greater the induced current generated by the coil 7. Using this principle, the fluid flow through the impeller can be measured by measuring the potential of the induced current Size, in order to facilitate the measurement, a conversion circuit is also set up to convert the AC to DC, which is convenient for measuring voltage, and then amplified by the amplifier to increase the measurement accuracy. In addition, the more important thing is that the induced current can also supply power to the meter head 2, so that it can be It is suitable for measurement in passive occasions, and a battery can also be installed, so that it can adapt to passive occasions where the flow rate changes drastically.
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