CN103616060A - Three-level annular flexible related micro-flow measuring device - Google Patents

Abstract

The invention relates to a three-level annular flexible related micro-flow measuring device, and belongs to the technical field of flow monitoring. The three-level annular flexible related micro-flow measuring device comprises a signal processing circuit board cavity (3), an output signal channel (1), an incident flow mark (2) and an annular sealing flexible collected signal transmission channel (4), wherein a signal processing circuit board is placed in the signal processing circuit board cavity (3), part of the output signal channel (1) is placed in the signal processing circuit board cavity (3), the incident flow mark (2) is arranged on the output signal channel (1), and the annular sealing flexible collected signal transmission channel (4) is arranged at the bottom of the signal processing circuit board cavity (3), and is connected with one end of the output signal channel (1), and a first sensor (5), a second sensor (6) and a third sensor (7) are connected to the annular sealing flexible collected signal transmission channel (4). The three-level annular flexible related micro-flow measuring device has the advantages of being simple in structure and obvious in effect, and correlation, continuity and detection accuracy of micro-flow detection measurement are improved.

Description

The flexible relevant micro-flow measurement device of a kind of tertiary circulation shape

Technical field:

The present invention relates to the flexible relevant micro-flow measurement device of a kind of tertiary circulation shape, belong to flow monitoring technical field.

Background technology:

In recent years, scientific research and commercial production become more meticulous to develop tiny flow quantity detection method and accuracy have been proposed to requirements at the higher level.But because miniflow is conventionally in micro-change condition current downflow, scope can be surveyed less, use the relevant flow measurement device of the at present conventional linear rigidity of secondary to have following defect to its detection: 1, secondary is measured structure and cannot completely smoothly be measured noise, and measurement result is unstable.2, measuring accuracy is not high.3, linear structure correlativity is bad.4, rigidity measurement mechanism natural frequency can be influential to measurement result.5, install and measure installation method relevant with pipe material.The relevant flow measurement device of secondary rigidity, for meeting various micrometeor testing requirements, has a significant improvement in following several respects both at home and abroad at present: 1, improve antijamming capability.2, improve sensor measurement performance.3, improve manufacture craft, improve linear structure correlativity.4, use the new material of making.But the linear rigidity flow of secondary measurement of correlation device is subject to the restriction of physical characteristics and architectural feature, still causes commonly using at present the relevant flow detector of the linear rigidity of secondary and cannot meet the true requirement that micrometeor detects completely.

By literature search, do not find the relevant open report of the correlative flow pick-up unit identical with technical solution of the present invention.

Summary of the invention:

The object of the invention is to overcome the deficiency of the linear rigidity flow of existing secondary related detection device to tiny flow quantity detection, provide a kind of tertiary circulation shape flexible relevant micro-flow measurement device.

The flexible relevant micro-flow measurement device of a kind of tertiary circulation shape of the present invention, by the signal processing circuit board chamber (3) that is placed with signal processing circuit board in it, part is placed in the output signal channel (1) of signal processing circuit board chamber (3), be placed in and meet the will of failing to be sold at auction (2), the flexible collection signal transmission channel of ring seal (4) composition that is placed in below, signal processing circuit board chamber (3) and is connected with output signal channel (1) one end on output signal channel (1), wherein: in the flexible collection signal transmission channel of ring seal (4), be connected with first sensor (5), the second sensor (6) and the 3rd sensor (7), first sensor (5), between the second sensor (6) and the 3rd sensor (7), distance equates, by first sensor (5) and the second sensor (6), and second the miniflow random noise signal that gathers of sensor (6) and the 3rd sensor (7) by the flexible collection signal transmission channel of ring seal (4), be transferred to the signal processing circuit board of placing in signal processing circuit board chamber (3), the result that signal is processed outputs to external demonstration memory device by output signal channel (1).

The present invention's device used is that market is bought.

That the present invention has advantages of is simple in structure, successful, miniflow accuracy of detection are high.

Accompanying drawing explanation:

Fig. 1 is structural representation of the present invention.

Fig. 2 is the structural representation of measuring state of the present invention.

Embodiment:

The present invention's device used is that market is bought.Its assembly connection as shown in Figure 1.

The flexible relevant micro-flow measurement device of a kind of tertiary circulation shape of the present invention, by the signal processing circuit board chamber 3 that is placed with signal processing circuit board in it, part is placed in the output signal channel 1 in signal processing circuit board chamber 3, be placed in the will 2 of failing to be sold at auction of meeting on output signal channel 1, be placed in 3 belows, signal processing circuit board chamber and the flexible collection signal transmission channel 4 of ring seal that is connected with output signal channel 1 one end forms; Wherein: in the flexible collection signal transmission channel 4 of ring seal, be connected with first sensor 5, the second sensor 6 and the 3rd sensor 7, between first sensor 5, the second sensor 6 and the 3rd sensor 7, distance equates, by first sensor 5 and the second sensor 6, and second the miniflow random noise signal that gathers of sensor 6 and the 3rd sensor 7 by the flexible collection signal transmission channel 4 of ring seal, be transferred to the signal processing circuit board of signal processing circuit board chamber 3 interior placements, the result that signal is processed outputs to external demonstration memory device by output signal channel 1.

During use, the measurement mechanism shown in Fig. 1 is met and banished in the position that need to monitor micrometeor (as shown in Figure 2) by meeting will 2 pointing directions of failing to be sold at auction, and be connected with external demonstration memory device.Open external demonstration memory device, show the measured flow velocity of storage and flow value.For guaranteeing miniflow flow measurement accuracy, need guarantee that small fluid flows to first sensor 5 and the second sensor 6, and between the second sensor 6 and the 3rd sensor 7 geometry substantially without affecting.

Flow measurement process is as follows:

The first step: gather the miniflow random noise signal X that first sensor 5, the second sensor 6 and the 3rd sensor 7 detect ₅(t _i), X ₆(t _i) and X ₇(t _i), by the flexible collection signal transmission channel of ring seal 4 access signal processing circuit board chambeies 3.Wherein measure number of times 1≤i≤100, Measuring Time 0≤t _i≤ T, T is for enough to measure the time of miniflow flow velocity.

Second step: the signal processing circuit board of signal processing circuit board chamber 3 interior placements is to input signal X ₅(t _i), X ₆(t _i) and X ₇(t _i) process to obtain t _imoment miniflow speed

, detailed process is:

(a) by signal X ₅(t _i) and X ₆(t _i) delay time T, 0≤τ≤T obtains X ₅(t _i+ τ), X ₆(t _i+ τ);

(b) calculate X ₅(t _i), X ₆(t _i) and X ₆(t _i), X ₇(t _i) for the cross correlation value of different value τ:

$R_{X_5{X}_6}(\mathrm{\τ},T)=\frac{1}{T}\underset{0}{\overset{T}{\∫}}{X}_5(t_i+\mathrm{\τ})X_6\left(t_i\right){\mathrm{dt}}_i$

$R_{X_6{X}_7}(\mathrm{\τ},T)=\frac{1}{T}\underset{0}{\overset{T}{\∫}}{X}_6(t_i+\mathrm{\τ})X_7\left(t_i\right)d{t}_i$

(c) relatively

with

obtain respectively the corresponding delay time T of its maximal value ₁, τ ₂.

(d) by distance d between sensor and the corresponding delay time T of maximal value ₁, τ ₂calculate miniflow speed

.

$v_{t_i}=\frac{1}{2}(\frac{d}{{\mathrm{\τ}}_1}+\frac{d}{{\mathrm{\τ}}_2})$

The 3rd step: calculate and remove error miniflow mean flow rate

$\stackrel{\&OverBar;}{v}=v_{{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000438844700000011.png,HDA0000438844700000021.png"\; state="\{\{state\}\}">t</figure-callout>}}_1},$ Work as i=1; $\stackrel{\&OverBar;}{v}=\frac{\stackrel{\&OverBar;}{v}+v_{t_i}}{2},$ When i >=2.

The 4th step: according to going error miniflow speed

obtain miniflow flow Q.

Claims (1)

1. the flexible relevant micro-flow measurement device of a tertiary circulation shape, it is characterized in that this measurement mechanism is by the signal processing circuit board chamber (3) that is placed with signal processing circuit board in it, part is placed in the output signal channel (1) of signal processing circuit board chamber (3), be placed in and meet the will of failing to be sold at auction (2), the flexible collection signal transmission channel of ring seal (4) composition that is placed in below, signal processing circuit board chamber (3) and is connected with output signal channel (1) one end on output signal channel (1), wherein: in the flexible collection signal transmission channel of ring seal (4), be connected with first sensor (5), the second sensor (6) and the 3rd sensor (7), first sensor (5), between the second sensor (6) and the 3rd sensor (7), distance equates, by first sensor (5) and the second sensor (6), and second the miniflow random noise signal that gathers of sensor (6) and the 3rd sensor (7) by the flexible collection signal transmission channel of ring seal (4), be transferred to the signal processing circuit board of placing in signal processing circuit board chamber (3), the result that signal is processed outputs to external demonstration memory device by output signal channel (1).

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