CN107084768A - A Method of Improving Measuring Accuracy of Oval Gear Flowmeter - Google Patents
A Method of Improving Measuring Accuracy of Oval Gear Flowmeter Download PDFInfo
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- CN107084768A CN107084768A CN201710337863.1A CN201710337863A CN107084768A CN 107084768 A CN107084768 A CN 107084768A CN 201710337863 A CN201710337863 A CN 201710337863A CN 107084768 A CN107084768 A CN 107084768A
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- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000003321 amplification Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/10—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation
- G01F11/12—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements
- G01F11/20—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates
- G01F11/22—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates for liquid or semiliquid
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
技术领域technical field
本发明属于工业流量测量技术领域，具体涉及一种细分椭圆齿轮流量计测量信号的计量单元，来提高椭圆齿轮流量计测量精度的方法。The invention belongs to the technical field of industrial flow measurement, and in particular relates to a method for subdividing the measurement signal of an oval gear flowmeter into a metering unit to improve the measurement accuracy of the oval gear flowmeter.
背景技术Background technique
椭圆齿轮流量计是一种容积式流量计，利用机械测量元件把流体连续不断地分割成单个已知的体积，根据计量室逐次、重复地充满和排放该体积部分流体的次数来测量流量体积总量。椭圆齿轮流量计可以选铸铁、铸钢、304不锈钢、316不锈钢等材料制造，适用于化工、石油、医药、电力、冶金和食品等行业的流量计量。The oval gear flowmeter is a volumetric flowmeter that uses mechanical measuring elements to continuously divide the fluid into a single known volume, and measures the total flow volume according to the number of times the metering chamber fills and discharges the volume part of the fluid successively and repeatedly. quantity. The oval gear flowmeter can be made of cast iron, cast steel, 304 stainless steel, 316 stainless steel and other materials, and is suitable for flow measurement in chemical, petroleum, pharmaceutical, electric power, metallurgy and food industries.
椭圆齿轮流量计是主要是由计数器、发信器、精度调节器、联轴器、支架、前盖、椭圆齿轮、壳体、后盖等零部件构成，见图1。壳体、前盖与后盖板构成一个密封的初月形空腔作为一次排量的计算单位。当被测液体经管道进入流量计初月形空腔时，进出口间的压力差推动一对椭圆齿轮连续旋转，不断地把经初月形空腔计量后的液体输送到出口处，椭圆齿轮的转数与每次排量四倍的乘积即为被测液体流量的总量。The oval gear flowmeter is mainly composed of counters, transmitters, precision regulators, couplings, brackets, front covers, oval gears, housings, and back covers, as shown in Figure 1. The shell, the front cover and the rear cover form a sealed crescent-shaped cavity as the calculation unit of the primary displacement. When the liquid to be measured enters the crescent-shaped cavity of the flowmeter through the pipeline, the pressure difference between the inlet and outlet drives a pair of oval gears to rotate continuously, continuously transporting the liquid measured by the crescent-shaped cavity to the outlet, and the oval gears The product of the number of revolutions and four times each displacement is the total amount of the measured liquid flow.
椭圆齿轮流量计流量测量通过测量椭圆齿轮的旋转速度来计量。有就地显示和远传显示两种。就地显示将齿轮的转动通过一系列的减速及调整转速比机构之后，直接与仪表面板上的指示针相连，并经过机械式计数器进行总量的显示。远传显示主要是通过减速后的齿轮带动永久磁铁旋转，使得弹簧继电器的触点以与永久磁铁相同的旋转频率同步地闭合或断开，从而发出一个个电脉冲远传给另一显示仪表。Oval gear flowmeter flow measurement is metered by measuring the rotational speed of an oval gear. There are two kinds of local display and remote display. On-site display After the rotation of the gear passes through a series of deceleration and speed ratio adjustment mechanisms, it is directly connected to the indicator needle on the instrument panel, and the total amount is displayed through a mechanical counter. The remote transmission display mainly drives the permanent magnet to rotate through the decelerated gear, so that the contacts of the spring relay are closed or disconnected synchronously at the same rotation frequency as the permanent magnet, thus sending out electric pulses to another display instrument.
椭圆齿轮流量计计量精度高，适用于高粘度介质流量的测量，通常椭圆齿轮流量计的精度可达0.5级，是一种较为准确的流量计量仪表，但是如果使用时被测介质的流量过小，椭圆齿轮流量计仪表不再能保证足够的测量精度会引起测量误差，也使得小于1L/min小流量难以测量。The oval gear flowmeter has high measurement accuracy and is suitable for measuring the flow of high-viscosity media. Usually, the accuracy of the oval gear flowmeter can reach 0.5 grades. It is a relatively accurate flow meter, but if the flow rate of the measured medium is too small when used , The oval gear flowmeter instrument can no longer guarantee sufficient measurement accuracy, which will cause measurement errors, and also make it difficult to measure small flows less than 1L/min.
发明内容Contents of the invention
本发明是在现有的椭圆齿轮流量计上，加装一个脉冲信号编码放大器，将减速后的齿轮带动永久磁铁旋转使弹簧继电器的触点产生的电脉冲信号根据实际使用需要放大2-1000倍，并以4-20mA的信号传给自动控制系统，大幅增加了脉冲信号计量单元，提高了单个计量单元的精度，提高了克服了流量小脉冲信号不灵敏，使得小流量流量计测量下限减小，从而提高了椭圆齿轮流量计的测量精度。The present invention adds a pulse signal encoding amplifier to the existing oval gear flowmeter, and the decelerated gear drives the permanent magnet to rotate, so that the electric pulse signal generated by the contact of the spring relay is amplified by 2-1000 times according to actual use needs. , and the 4-20mA signal is transmitted to the automatic control system, which greatly increases the pulse signal measurement unit, improves the accuracy of a single measurement unit, and overcomes the insensitivity of small flow pulse signals, which reduces the lower limit of measurement of small flow flowmeters , thus improving the measurement accuracy of the oval gear flowmeter.
为了实现上述目的，本发明采用如下技术方案：In order to achieve the above object, the present invention adopts the following technical solutions:
一种椭圆齿轮流量计，如图1所示，主要由计数器、发信器、精度调节器、联轴器、支架、前盖、椭圆齿轮、壳体、后盖与编码放大器构成。本发明是将一个编码器放大器安装在所述的椭圆齿轮流量计发信器上，通过联轴器将编码器的轴与发信器输出轴同轴线相连，发信器发出的电脉冲信号由编码器放大器进行细分和放大，并以4-20mA电流远传给PLC控制系统或另一显示仪表显示。同样的一个脉冲信号就被编码器放大器以预设的放大倍数N进行了细分，同样的流量信号的计量单元就可以以没放大之前的1/N来计量和显示，因此加装编码器放大器后椭圆齿轮流量计的计量精度得到了大幅度提高。An oval gear flowmeter, as shown in Figure 1, is mainly composed of a counter, a transmitter, a precision regulator, a coupling, a bracket, a front cover, an oval gear, a housing, a rear cover and an encoding amplifier. In the present invention, an encoder amplifier is installed on the transmitter of the oval gear flowmeter, and the shaft of the encoder is connected with the output shaft of the transmitter through a coupling, and the electrical pulse signal sent by the transmitter It is subdivided and amplified by the encoder amplifier, and sent to the PLC control system or another display instrument for display with 4-20mA current. The same pulse signal is subdivided by the encoder amplifier with a preset magnification factor N, and the metering unit of the same flow signal can be measured and displayed at 1/N before it is amplified, so an encoder amplifier is installed The measurement accuracy of the rear oval gear flowmeter has been greatly improved.
本发明的有益效果是：The beneficial effects of the present invention are:
本发明将一个编码器放大器安装在所述的椭圆齿轮流量计发信器上，能实现椭圆齿轮流量计的流量计量单元的大幅缩小，从而实现了椭圆齿轮流量计的流量计量精度的大幅度提高。In the present invention, an encoder amplifier is installed on the transmitter of the oval gear flowmeter, which can greatly reduce the flow measurement unit of the oval gear flowmeter, thereby greatly improving the flow measurement accuracy of the oval gear flowmeter .
附图说明Description of drawings
图1为本发明的椭圆齿轮流量计结构与编码放大器安装位置示意图；Fig. 1 is a schematic diagram of the structure of the oval gear flowmeter of the present invention and the installation position of the encoding amplifier;
1.计数器，2.发信器，3.精度调节器，4.联轴器，5.支架，6.前盖，7.椭圆齿轮，8.壳体，9.后盖，10. 编码器放大器；1. Counter, 2. Transmitter, 3. Accuracy regulator, 4. Coupling, 5. Bracket, 6. Front cover, 7. Oval gear, 8. Shell, 9. Back cover, 10. Encoder amplifier;
图2为本发明的椭圆齿轮流量计加装编码放大器后远传和显示原理示意图。Fig. 2 is a schematic diagram of the principle of remote transmission and display after the oval gear flowmeter of the present invention is equipped with a coding amplifier.
具体实施方式detailed description
下面结合附图与实施例对本发明作进一步说明：Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
如图1所示，椭圆齿轮流量计主要由计数器、发信器、精度调节器、联轴器、支架、前盖、椭圆齿轮、壳体、后盖与编码放大器构成。本发明是将一个编码器放大器10安装在所述的发信器上，通过联轴器将编码器的轴与发信器2输出轴同轴线相连，发信器2发出的电脉冲信号由编码器放大器10进行细分和放大，并以4-20mA电流远传给PLC控制系统或另一显示仪表显示。加装编码放大器10前同一个脉冲信号就被编码器放大器10以预设的放大倍数N进行了细分，同样的流量信号的计量单元就可以以没放大之前的1/N来计量和显示，因此加装编码器10放大器后椭圆齿轮流量计的计量精度得到了大幅度提高。安装编码放大器10，是将编码放大器10安装发信器2的端盖上，保证编码放大器10的转动轴与发信器2的输出轴在同一轴线上，并通过配套联轴器连接编码放大器10的转动轴与发信器2的输出轴。As shown in Figure 1, the oval gear flowmeter is mainly composed of a counter, a transmitter, a precision regulator, a coupling, a bracket, a front cover, an oval gear, a housing, a back cover and an encoding amplifier. The present invention installs an encoder amplifier 10 on the transmitter, and the shaft of the encoder is connected to the output shaft of the transmitter 2 through a shaft coupling, and the electric pulse signal sent by the transmitter 2 is obtained by The encoder amplifier 10 performs subdivision and amplification, and transmits the 4-20mA current to the PLC control system or another display instrument for display. Before installing the encoder amplifier 10, the same pulse signal is subdivided by the encoder amplifier 10 with a preset amplification factor N, and the metering unit of the same flow signal can be measured and displayed at 1/N before the amplification. Therefore, the measurement accuracy of the oval gear flowmeter has been greatly improved after the encoder 10 amplifier is installed. Installing the encoder amplifier 10 is to install the encoder amplifier 10 on the end cover of the transmitter 2 to ensure that the rotating shaft of the encoder amplifier 10 is on the same axis as the output shaft of the transmitter 2, and connect the encoder amplifier 10 through a supporting coupling The rotating shaft and the output shaft of the sender 2.
如图2所示，本发明的椭圆齿轮流量计加装编码放大器后远传和显示原理示意，由椭圆齿轮流量计计数器1、精度调节器3与发信器2产生的流量信号同步传给编码器放大器10，由编码器放大器10以4-20mA电流信号远传给PLC控制系统或另一显示仪表显示。加装编码放大器后，原来现场显示部分可以继续使用，如果需要显示放大后的信号，需配套加装适宜的显示仪表。As shown in Figure 2, the oval gear flowmeter of the present invention is equipped with a coding amplifier and the principle of remote transmission and display is shown. Encoder amplifier 10, the encoder amplifier 10 transmits the 4-20mA current signal to the PLC control system or another display instrument for display. After installing the coding amplifier, the original on-site display part can continue to be used. If it is necessary to display the amplified signal, it is necessary to install a suitable display instrument.
上述虽然结合附图对本发明的具体实施方式进行了描述，但并非对本发明保护范围的限制，所属领域技术人员应该明白，在本发明的技术方案的基础上，本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围以内。Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710337863.1A CN107084768A (en) | 2017-05-15 | 2017-05-15 | A Method of Improving Measuring Accuracy of Oval Gear Flowmeter |
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| CN201710337863.1A CN107084768A (en) | 2017-05-15 | 2017-05-15 | A Method of Improving Measuring Accuracy of Oval Gear Flowmeter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2662202Y (en) * | 2003-10-17 | 2004-12-08 | 上海一诺仪表有限公司 | A four-rotator flowmeter |
| CN101608937A (en) * | 2008-06-20 | 2009-12-23 | 安徽理工大学 | A Low Pulsation Compound Gear Type Gear Flowmeter |
| CN201425495Y (en) * | 2009-05-27 | 2010-03-17 | 无锡恒滨精密机械制造厂 | Liquid volume flow meter for fuel tanker |
| CN202177409U (en) * | 2011-07-28 | 2012-03-28 | 唐自福 | Gear flow transducer |
| CN103674124A (en) * | 2012-09-04 | 2014-03-26 | 天津有序环境科技发展有限公司 | Gear type flow direction flow transmitter |
-
2017
- 2017-05-15 CN CN201710337863.1A patent/CN107084768A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2662202Y (en) * | 2003-10-17 | 2004-12-08 | 上海一诺仪表有限公司 | A four-rotator flowmeter |
| CN101608937A (en) * | 2008-06-20 | 2009-12-23 | 安徽理工大学 | A Low Pulsation Compound Gear Type Gear Flowmeter |
| CN201425495Y (en) * | 2009-05-27 | 2010-03-17 | 无锡恒滨精密机械制造厂 | Liquid volume flow meter for fuel tanker |
| CN202177409U (en) * | 2011-07-28 | 2012-03-28 | 唐自福 | Gear flow transducer |
| CN103674124A (en) * | 2012-09-04 | 2014-03-26 | 天津有序环境科技发展有限公司 | Gear type flow direction flow transmitter |
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