CN1603762A - Heat pulse time difference type flow detection method - Google Patents

Heat pulse time difference type flow detection method Download PDF

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CN1603762A
CN1603762A CN 200410067741 CN200410067741A CN1603762A CN 1603762 A CN1603762 A CN 1603762A CN 200410067741 CN200410067741 CN 200410067741 CN 200410067741 A CN200410067741 A CN 200410067741A CN 1603762 A CN1603762 A CN 1603762A
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temperature
element
pulse
heating element
heating
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CN 200410067741
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傅新
谢海波
段萱苡
杨华勇
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浙江大学
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Abstract

This invention discloses a heat impulse time lag flow measurement method, which puts sensor in the parallel pipe to the flow direction to get heating temperature measurement, or its denote output signal curve; then it measures the temperature change on downstream of temperature measurement element along flow direction to get output signal curve of temperature element; it compares two curves to measure the time lag value to get flow speed. This invention especially applied in the measurement of middle and low speed range of gas with constant components.

Description

热脉冲时差式流量检测方法 Heat pulse transit-time flow rate detection method

技术领域 FIELD

本发明涉及质量流量检测方法,特别是涉及一种热脉冲时差式流量检测方法。 The present invention relates to a mass flow rate detection method, particularly to a heat pulse transit-time flow rate detection method.

背景技术 Background technique

现有的热式流量计分为两种类型,1、风速计;2、测热型流量传感器。 The conventional thermal type flow meter divided into two types, an anemometer; 2, calorimetric type flow sensors.

风速计基于1914年提出的金式定律工作,通过检测暴露在流体中的加热器本身的热耗散程度来检测流速。 King's law formula anemometer made based on the work of 1914, the degree of heat dissipation itself is detected by detecting the flow rate of the fluid exposed to the heater. 这种模式的传感器包括一段固定几何尺寸的直流道,一个温度敏感材料制成的加热器,一个测量流体原始温度的参考温度传感器和相应的控制测量电路,通过检测液体中因液体流动而带走的热量的多少来测量流速。 This mode sensor comprises a fixed geometry sprue heater made of a temperature sensitive material, a temperature sensor measuring the reference fluid and the initial temperature of the measuring circuit corresponding control, carried away by liquid flow in the liquid by detecting how to measure the flow of heat. 传感器元件可以用各种对温度敏感的材料制成。 Various sensor element may be temperature-sensitive material. 这种传感器具有高的响应频率,大的测速范围,但不能用于长时间测量,能耗大,易于被污染和毁损。 Such a sensor has a high frequency response, a large speed range, but not for long-term measurements, energy consumption, easily contaminated and damaged.

测热型质量流量检测方法在1993年由Theo SJLammerink提出,测热式传感器是通过检测单一热源周围的温度分布情况来检测流体流速。 A thermal mass flow measurement type detection method proposed by Theo SJLammerink 1993, calorimetric sensors are detected by a single heat source temperature distribution around the fluid flow rate detection. 对于该种工作原理的传感器,其中包含一个单一热源和至少一对温度传感器,分别置于相对于单一热源对称或者不对称的上游和下游。 For this kind of operating principle of the sensor, which comprises a single heat source and at least a pair of temperature sensors disposed respectively upstream and downstream of a single heat source with respect to the symmetrical or asymmetrical. 在测量的时候,通过测量上下游温度传感器的温度差值,从而确定流体流速。 At the time of measurement, by measuring the temperature difference between the downstream temperature sensor, thereby determining the fluid flow rate. 此种工作原理对小流量极其敏感,尤其在微流体计量中显示出极大的优势,因此成为微流体传感器的研究热点。 Such works are extremely sensitive to small flow, especially in microfluidics metrology showed great superiority, and therefore become a hot topic microfluidic sensor. 1997年由NTNguyen提出了在加热器两侧不对称分布温度传感器的方法,该方法通过增大上游温度传感器与加热器之间的距离,减小下游温度传感器与加热器之间的距离,然后将这两个温度值相减,得到流速信息。 In 1997 a method proposed by NTNguyen asymmetrically distributed on both sides of the heater temperature sensor, the method by increasing the distance between the upstream temperature sensor and the heater, reducing the distance between the heater and the downstream temperature sensor, and then these two temperatures subtracted to obtain velocity information. 由此获得的上下游温度差曲线虽然在低速段线性度受到影响,但是曲线的饱和点得以后移,从而增大了测量范围。 Downstream temperature difference between the curve thus obtained while the low linearity affected sections, the saturation point of the curve obtained after the shift, thereby increasing the measurement range.

上述两种测量方法共同存在的问题在于:如果用于需要流量进行实时监控的场合,两种测量方法都需要对加热元进行长时间的供电,使其处于加热状态,因此能耗和传感器本身的损耗都较大。 The above-described two measurement methods common problem is that: if the occasion required for real-time monitoring of the flow, two measurement methods require a long time to supply the heating element, it is in a heated state, and thus the energy consumption of the sensor itself losses are larger.

发明内容 SUMMARY

为克服背景技术中存在的问题,本发明的目的是提供一种热脉冲时差式流量检测方法。 To overcome the problems in the background art, an object of the present invention is to provide a heat pulse transit-time flow rate detection method.

本发明解决其技术问题所采用的技术方案是:1、热脉冲时差式流量检测方法:1)将传感器放入与流速方向平行的管道之中,用脉冲供电电源对加热测温元或者加热元提供脉冲供电,加热信号为加热脉冲输入信号;在加热测温元或者加热元中产生了脉冲电流,测量加热测温元或者表征加热元温度的测温元的温度变化,得到一条脉冲曲线,即加热测温元或者表征加热元温度的测温元输出信号曲线;2)再对沿流速方向处于加热测温元或者表征加热元温度的测温元下游的测温元的温度变化进行测量,亦得到一条脉冲曲线,即测温元输出信号曲线;3)将以上两条输出信号曲线进行对比,发现加热测温元或者表征加热元温度的测温元输出的脉冲曲线波形同一周期的峰值到达时间与处于下游的测温元的脉冲曲线波形同一周期的峰值到达时间之间存在时间滞后,通过 The present invention solves the technical problem using the technical solution is: 1, flow rate detecting heat pulse time difference Method: Among 1) Place sensor in a direction parallel to the flow duct, the pulse power supply to the heating element or the heating element temperature heat pulse input signal pulse supply, a heating signal; temperature in the heating element or the heating element is generated in a pulse current measured temperature heating element or elements characterizing the temperature change temperature heating element temperature, to obtain a pulse waveform, i.e., temperature heating element or temperature measuring element output signal characterizing the heating element temperature curve; 2) and then is heated to temperature in the flow direction of the heating element or temperature characterizing the temperature of the element temperature change element temperature is measured downstream element, also to obtain a pulse waveform, i.e. temperature measuring element output signal curve; 3) the output signals of two or more curves found by comparing temperature heating element or the heating element temperature characterizing the pulse waveform outputted from the waveform of the temperature measuring element peak arrival time of the same period and the pulse waveform is the waveform of the downstream temperature measuring element of the same cycle time between peak arrival time lag by 检测该时间滞的时滞值,即测定流速。 The detection time lag lag value, i.e., a measured flow rate.

2、两条脉冲曲线比较方法如下:v=dsTh]]>式中:ds-加热测温元或表征加热元温度的测温元与下游测温元之间的距离;Th-输出的两脉冲信号之间的时滞值;V-流速。 2, two curves comparing the pulse as follows: v = dsTh]]> Where: ds- temperature heating element or heating element characterized thermometric element and the temperature of the downstream temperature measuring a distance between the element; two output pulse Th- time lag between a signal value; V- flow.

本发明与背景技术相比,具有的有益的效果是:本发明在传统热式质量流量的原理上进行改进,对加热元提供脉冲式供电,通过比较加热元的温度变化信号和测温元的温度变化信号之间的时滞来完成对流量的检测。 Compared with the background of the invention, having a beneficial effect: the principle of the present invention in a conventional thermal mass flow improvement, the heating element providing power pulse, by comparing the temperature of the heating element and temperature measuring elements change signal time lag between the change in temperature to complete the detection of the signal flow. 特别是在对成分恒定的气体的中、低速的质量测量中,用于需要长时间监测一维定向流速的场合,降低检测元损耗,节约能源的热式流量检测方法。 In particular, the low quality measure of a constant composition of the gas, a case for a long time is required to monitor the flow rate of dimensional orientation, reduce cell loss is detected, the thermal flow rate detection method for energy savings.

附图说明 BRIEF DESCRIPTION

图1是热脉冲时差式流量检测方法的原理时序图;图2是本发明实施例1的结构原理图;图3是本发明实施例2的结构原理图。 1 is a schematic timing chart showing the heat pulse transit-time flow rate detection method; FIG. 2 is a block schematic diagram of an embodiment of the present invention; FIG. 3 is a block schematic diagram of the second embodiment of the present invention.

具体实施方式 detailed description

1、热脉冲时差式流量检测方法,如图1所示: 1, the heat pulse transit-time flow rate detection method, shown in Figure 1:

1)将传感器放入与流速方向平行的管道之中,用脉冲供电电源对加热测温元或者加热元提供脉冲供电,加热信号为加热脉冲输入信号A;在加热测温元或者加热元中产生了脉冲电流,测量加热测温元或者表征加热元温度的测温元的温度变化,得到一条脉冲曲线,即加热测温元或者表征加热元温度的测温元输出信号曲线B;2)再对沿流速方向处于加热测温元或者表征加热元温度的测温元下游的测温元的温度变化进行测量,亦得到一条脉冲曲线,即测温元输出信号曲线C;3)将以上两条输出信号曲线进行对比,发现加热测温元或者表征加热元温度的测温元输出的脉冲曲线波形同一周期的峰值到达时间与处于下游的测温元的脉冲曲线波形同一周期的峰值到达时间之间存在时间滞后,通过检测该时间滞的时滞值,即测定流速。 1) among the flow rate sensor in the pipeline direction parallel with the pulse power supply to the heating element or the heating element temperature to provide a pulse power supply, the heating heat pulse signal to the input signal A; heat generating element or the temperature of the heating element a pulse current, the heating temperature measurement element or elements characterizing the temperature change temperature of heating element temperature, to obtain a pulse waveform, i.e. heating element temperature or heating element characterized by temperature measuring element output signal of the temperature curve B; 2) and then the in the direction of flow in the heating element or the temperature measuring element temperature characterizing the temperature change of the temperature measurement element downstream of the heating element temperature is measured, a pulse waveform is also obtained, i.e. temperature measuring element output signal curve C; 3) two or more output signal curve found by comparing the heating element or the temperature measuring element output of the heating element temperature characterizing the temperature profile of the pulse waveform peak value of the same cycle time to peak temperature in the curve of the pulse waveform of the same downstream of the element is present between the arrival time period time lag, the time lag by detecting the value of the time delay, i.e., a measured flow rate.

2、两条脉冲曲线B、C比较方法如下:v=dsTh]]>式中:ds-加热测温元或表征加热元温度的测温元与下游测温元之间的距离;Th-输出的两脉冲信号之间的时滞值;V-流速。 2, two pulse curves B, C Comparative follows: v = dsTh]]> Where: ds- temperature heating element or heating element characterized thermometric element and the temperature of the downstream temperature measuring a distance between the element; output Th- time lag between the two pulse signal value; V- flow.

具体实施1如图2所示,包括脉冲供电电源1,由加热测温元4、沿流速方向处于加热测温元下游的测温元5和绝热基底6组成的传感器,以及后端的信号比较电路7。 DETAILED DESCRIPTION FIG 1 of sensors 2, comprising a pulse power supply 1, a heating temperature measuring unit 4, in a heating element temperature of the downstream temperature measuring element along the flow direction of the heat insulating substrate 5 and 6, and a rear end of the signal comparison circuit 7. 将传感器放入与流速方向平行的管道之中,对加热测温元4提供脉冲输入,在加热测温元4中产生了脉冲电流,测量加热测温元4的温度变化,可得到一条脉冲曲线。 The flow rate sensor in the pipeline in a direction parallel to the temperature of the heating element 4 to provide a pulse input, the heating temperature measuring unit 4 is generated in the pulse current, measuring the heating temperature of the temperature change unit 4, a pulse waveform obtained . 此时,再对处于加热测温元4下游的测温元5的温度变化进行测量,亦可得到一条脉冲曲线。 At this time, in the heating temperature and then the temperature change of the downstream temperature measuring unit 4 of the element 5 is measured, one can obtain a pulse waveform. 通过后端的信号比较电路7将两条脉冲曲线进行对比,可发现加热测温元的脉冲曲线波形同一周期的峰值到达时间与测温元的脉冲曲线波形同一周期的峰值到达时间之间存在时间滞后,通过检测该时间滞后,可以得到关于流速的信息。 The two curves by comparing the pulse signal from the comparator circuit 7 of the rear end, the heating temperature can be found membered pulse profile waveform reaches the peak of the same pulse period versus time waveform peak temperature measuring element is present in the same cycle time lag between the arrival time , by detecting the time lag, it is possible to obtain information on the flow rate.

具体实施2如图3所示,包括脉冲供电电源1,由加热元2、表征加热元温度变化的测温元3、沿流速方向处于加热测温元下游的测温元5和绝热基底6组成的传感器,以及后端的信号比较电路7。 DETAILED embodiment 2 shown in Figure 3, comprising a pulsed power supply, by the heating element 2, the heating temperature characterizing the temperature change element unit 3, the heating temperature in the downstream of the temperature measuring element and the insulating element 5 in the direction of flow of the substrate 6 composed of a sensor, and a rear end of the signal comparison circuit 7. 将传感器放入与流速方向平行的管道之中,对加热元2提供脉冲供电,在加热元2中产生了脉冲电流,测量表征加热元温度的测温元3的电阻变化,可得到一条脉冲曲线。 Among the pipeline flow sensor in a direction parallel to provide power to the heating element 2 pulse, a pulse current is generated in the heating element 2, heating element temperature characterizing the temperature measured variable resistance element 3, a pulse waveform obtained . 此时,再对处于表征加热元温度变化的测温元下游的测温元6的温度变化进行测量,亦可得到一条脉冲曲线。 At this time, the temperature measurement element and then the heating element is characterized by a temperature change of the downstream temperature measuring element 6 is measured the temperature change, can obtain a pulse waveform. 通过后端的信号比较电路7将两条脉冲曲线进行对比,可发现加热测温元的脉冲曲线波形同一周期的峰值到达时间与测温元的脉冲曲线波形同一周期的峰值到达时间之间存在时间滞后,通过检测该时间滞后,可以得到关于流速的信息。 The two curves by comparing the pulse signal from the comparator circuit 7 of the rear end, the heating temperature can be found membered pulse profile waveform reaches the peak of the same pulse period versus time waveform peak temperature measuring element is present in the same cycle time lag between the arrival time , by detecting the time lag, it is possible to obtain information on the flow rate.

所述的测温元或者加热测温元由温度敏感材料制成,可以是温度敏感电阻,热电偶,热电堆等。 The temperature of the heating element or the temperature measuring element is made of a temperature sensitive material, it may be a temperature sensitive resistor, a thermocouple, a thermopile and the like. 所述的脉冲供电电源为提供产生脉冲波形的电源。 The pulsed power supply to provide power to generate a pulse waveform. 所述的信号比较电路包含具有两个以上A/D输入通道的单片机或者其他可完成类似功能的芯片和电路。 The signal comparison circuit comprises a microcontroller having two or more A / D input channels or other similar functions may be accomplished and the circuit chip.

Claims (2)

  1. 1.一种热脉冲时差式流量检测方法,其特征在于:1)将传感器放入与流速方向平行的管道之中,用脉冲供电电源(1)对加热测温元(4)或者加热元(2)提供脉冲供电,加热信号为加热脉冲输入信号(A);在加热测温元(4)或者加热元(2)中产生了脉冲电流,测量加热测温元(4)或者表征加热元(2)温度的测温元(3)的温度变化,得到一条脉冲曲线,即加热测温元(4)或者表征加热元(2)温度的测温元(3)输出信号曲线(B);2)再对沿流速方向处于加热测温元(4)或者表征加热元(2)温度的测温元(3)下游的测温元(5)的温度变化进行测量,亦得到一条脉冲曲线,即测温元输出信号曲线(C);3)将以上两条输出信号曲线(B)、(C)进行对比,发现加热测温元(4)或者表征加热元(2)温度的测温元(3)输出的脉冲曲线波形同一周期的峰值到达时间与处于下游的测温元的脉冲曲线波形同一周期的峰值到达时 A heat pulse transit-time flow rate detection method, comprising: in 1) Place sensor in a direction parallel to the flow duct, a pulse power supply (1) Temperature of heating element (4) or the heating element ( 2) providing a pulsed power supply, the heating heat pulse signal to the input signal (a); generating a pulse current temperature in the heating element (4) or the heating element in (2), the heating temperature measuring element (4) or heating element characterized ( 2) the temperature of the temperature measuring element (3) change in temperature, to obtain a pulse waveform, i.e. heating temperature measuring element (4) or heating element characterized by (2) the temperature of the temperature measuring element (3) an output signal curve (B); 2 ) in the direction of flow and then the temperature in the heating element (4) or heating element characterized by (2) the temperature measurement element (3) temperature of the temperature measuring element (5) is measured downstream of the temperature change, but also to obtain a pulse waveform, i.e., temperature measuring element output signal curve (C); 3) the output signal of the above two curves (B), (C) found by comparing temperature heating element (4) or heating element characterized by (2) temperature measuring element (temperature 3) the peak of the output pulse waveform of the same period of time of arrival of the pulse curve in the temperature profile downstream of the peaks of the waveform element of the same cycle reaches 之间存在时间滞后,通过检测该时间滞的时滞值,即测定流速。 Between the time lag by detecting the time lag lag value, i.e., a measured flow rate.
  2. 2.根据权利要求1所述的一种热脉冲时差式流量检测方法,其特征在于两条脉冲曲线(B)、(C)比较方法如下:v=dsTh]]>式中:ds-加热测温元或表征加热元温度的测温元与下游测温元之间的距离;Th-输出的两脉冲信号之间的时滞值;V-流速。 2. A thermal type flow rate difference pulse detecting method according to claim 1, characterized in that the two pulse waveform (B), (C) Comparison follows: v = dsTh]]> Where: ds- heating test Characterization of temperature-membered or temperature downstream of the heating element and the temperature of the element distance between the element temperature; time-delay value between the two pulse signals output from the Th-; V- flow.
CN 200410067741 2004-10-29 2004-10-29 Heat pulse time difference type flow detection method CN1603762A (en)

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CN102128654A (en) * 2011-01-18 2011-07-20 蔡茂林 Non-intrusive flow measuring device for industrial gas pipeline
CN102147420A (en) * 2010-12-30 2011-08-10 国家纳米技术与工程研究院 Blocky fluid sensor of time-division duplex microelectromechanical system and working method thereof
CN102341761A (en) * 2009-03-20 2012-02-01 阿凡田控股有限公司 Flow controller assembly for microfluidic applications and system for performing plurality of experiments in parallel
CN102393227A (en) * 2011-11-02 2012-03-28 蔡茂林 Flowmeter aide based on non-intrusive thermal dynamic measurement principle
CN102538886A (en) * 2012-01-07 2012-07-04 蔡茂林 Extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances
CN103415988A (en) * 2011-03-08 2013-11-27 丰田自动车株式会社 Cooling system for vehicle
CN104089664A (en) * 2014-06-27 2014-10-08 中国石油大学(北京) Thermal-pulse time-difference type oil-water two-phase flow measuring sensor

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102341761A (en) * 2009-03-20 2012-02-01 阿凡田控股有限公司 Flow controller assembly for microfluidic applications and system for performing plurality of experiments in parallel
CN102147420A (en) * 2010-12-30 2011-08-10 国家纳米技术与工程研究院 Blocky fluid sensor of time-division duplex microelectromechanical system and working method thereof
CN102128654A (en) * 2011-01-18 2011-07-20 蔡茂林 Non-intrusive flow measuring device for industrial gas pipeline
CN102128654B (en) 2011-01-18 2014-07-09 北京航空航天大学 Non-intrusive flow measuring device for industrial gas pipeline
CN103415988B (en) * 2011-03-08 2016-02-03 丰田自动车株式会社 Vehicle cooling system
CN103415988A (en) * 2011-03-08 2013-11-27 丰田自动车株式会社 Cooling system for vehicle
CN102393227B (en) 2011-11-02 2014-06-18 北京航空航天大学 Flowmeter aide based on non-intrusive thermal dynamic measurement principle and method for measuring flow measurenment
CN102393227A (en) * 2011-11-02 2012-03-28 蔡茂林 Flowmeter aide based on non-intrusive thermal dynamic measurement principle
CN102538886A (en) * 2012-01-07 2012-07-04 蔡茂林 Extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances
CN104089664A (en) * 2014-06-27 2014-10-08 中国石油大学(北京) Thermal-pulse time-difference type oil-water two-phase flow measuring sensor
CN104089664B (en) * 2014-06-27 2017-08-25 中国石油大学(北京) Heat pulse transit-time measurement of the amount of oil and water flow sensor

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