CN205720294U - Flow velocity automatic measurement mechanism - Google Patents

Abstract

The utility model discloses a kind of flow velocity automatic measurement mechanism, this device includes release pipe, common probe mediating recipe feed bin, described dose of feed bin front end connects with release pipe, it is provided with electromagnetic switch bottom release pipe, agent feed bin rear end is equipped with common probe and detection probe, common probe is connected with controller signals low level, and detection probe is connected with controller signals high level.Flow rate measuring device of the present utility model, the water movement time is obtained by the change of electrical conductivity between monitoring common probe and detection probe, and then calculating flow rate of water flow, measurement apparatus automaticity is high, and apparatus structure is ingenious, low cost, release pipe release high concentration ionization reagents, cause conductivity variations between detection probe and common probe, obtain ionization reagents time used on certain distance, thus calculate ionization reagents movement velocity, i.e. corresponding flow rate of water flow, has the advantages such as certainty of measurement height, good stability.

Description

Flow velocity automatic measurement mechanism

Technical field

This utility model relates to flow velocity automatic measurement mechanism, belongs to flow-speed measurement field.

Background technology

Flow velocity is the basic parameter describing water flow motion character istics, and under lab, it is must to survey parameter during modelling verification, working condition tests or scheme comparison etc..Flow-speed measurement method is often had to have Pitot tube, miniature propeller type current meter, ultrasound wave Doppler current meter (ADV), hot line hot film current meter (HWFA), laser dopper flowmeter current meter (LDV/LDA), particle image velocimeter (PIV) and surface flow field image velocimetry (RMSIV) etc..Owing to the instrumentations such as ADV, HWFA, LDV/LDA, PIV, RMSIV are complicated, expensive, it is difficult to large-scale application；Still further aspect, Pitot tube automaticity is low, and miniature propeller type current meter is easily disturbed by water quality, and certainty of measurement is limited, therefore, in the urgent need to taking into account the flow velocity new method of certainty of measurement and operability simultaneously.

Utility model content

Utility model purpose: in order to overcome the deficiencies in the prior art, this utility model provides a kind of flow velocity automatic measurement mechanism, indirectly measures flow rate of water flow by measuring the change of electrical conductivity between common probe and detection probe, and plant automation degree is high.

Technical scheme: for solving above-mentioned technical problem, a kind of flow velocity automatic measurement mechanism of the present utility model, including release pipe, common probe mediating recipe feed bin, described dose of feed bin front end connects with release pipe, it is provided with electromagnetic switch bottom release pipe, agent feed bin rear end is equipped with common probe and detection probe, and common probe is connected with controller signals low level, and detection probe is connected with controller signals high level.

As preferably, described release pipe is hollow structure, and external diameter 3-5mm, internal diameter 1-2mm communicate with agent feed bin, and agent feed bin top sets injecting hole.

As preferably, described detection probe is n, and n is the even number more than 1, and common probe is positioned at same straight line with detection probe core, n detection probe is arranged symmetrically with along release pipe with the common probe line of centres, and adjacent detection probe separation or detection probe and common probe interval are the most equal.

As preferably, described common probe and all detection probe materials are rustless steel, external diameter 1-3mm.

As preferably, upstream, water movement direction arranged by described release pipe, and common probe is arranged in downstream, water movement direction, and the distance between common probe and release pipe is that L, L discharge pipe external diameter equal to 2-3 times, and wherein L is no less than 6mm；Common probe and detection probe length are equal, than release pipe range L.

As preferably, the value of described n is 2,2 detection probes are respectively left detection probe and right detection probe, controller controls left detection probe and right detection probe does not simultaneously turns on, to prevent because water quality causes the electric current motion that cause different with right detection probe current potential of left detection probe, the monitoring of electrical conductivity between impact detection probe and common probe.

As preferably, described n value is the even number more than 2, and detection probe is Δ t with common probe ON time:

Δt<L/V_max/n/2

Vmax is current Peak Flow Rate to be measured；

Detection probe numbering, odd number is positioned on the left of common probe and by increasing numbering the most successively, even number is on the right side of common probe and by increasing numbering the most successively, from the odd number detection probe that distance common probe is nearest, sequentially turns on detection probe and common probe.

Beneficial effect: flow velocity automatic measurement mechanism of the present utility model, the time of flow is gone out by measuring the measure of the change of electrical conductivity between common probe and detection probe, and then measure flow rate of water flow, measurement process is all automatically performed by controller, plant automation degree is high, and this apparatus structure is ingenious, low cost；The measuring method of flow velocity automatic measurement mechanism of the present utility model, utilize high concentration ionization reagents from release pipe release, high concentration ionization reagents causes conductivity variations between detection probe and common probe, thus measure the time that ionization reagents is used on certain distance, measuring the flow velocity of ionization reagents, certainty of measurement is high.

Accompanying drawing explanation

Fig. 1 is main TV structure schematic diagram of the present utility model.

Fig. 2 is release pipe of the present utility model, common probe and the position view of detection probe.

Fig. 3 is test structural representation of the present utility model.

Detailed description of the invention

As shown in Figure 1 to Figure 3, a kind of flow velocity automatic measurement mechanism of the present utility model, including release pipe 1, common probe 2 mediating recipe feed bin 5, described dose of feed bin 5 front end connects with release pipe 1, it is provided with electromagnetic switch bottom release pipe 1, agent feed bin 5 rear end is provided with common probe 2 and detection probe 3, and common probe 2 is connected with controller 6 signal low level, and detection probe 3 is connected with controller signals high level.

In this utility model, described release pipe 1 is hollow structure, and external diameter 3-5mm, internal diameter 1-2mm communicate with agent feed bin 5, and agent feed bin 5 top sets injecting hole.Described detection probe has 5, and common probe 2 and 6 detection probes are located along the same line, and 6 detection probes are arranged symmetrically with along release pipe 1 with common probe 2 line of centres, and adjacent detection probe 3 is spaced or detects probe 3 and common probe 2 is spaced the most equal.

In this utility model, described common probe 2, detection probe material are rustless steel, external diameter 1-3mm, upstream, water movement direction arranged by described release pipe, common probe 2 is arranged in downstream, water movement direction, described common probe 2 discharges pipe 1 external diameter apart from for L, L equal to 2-3 times with release pipe 1, and wherein L is no less than 6mm；Common probe 2 and all of detection probe length are equal, than the release long L of pipe 1.

In this utility model, the value of described n is 2,2 detection probes are respectively left detection probe and right detection probe, controller controls left detection probe and right detection probe does not simultaneously turns on, to prevent because water quality causes the electric current motion that cause different with right detection probe current potential of left detection probe, the monitoring of electrical conductivity between impact detection probe and common probe.

In this utility model, described n value can also be the even number more than 2, and detection probe is Δ t with common probe ON time:

Δt<L/V_max/n/2

Vmax is current Peak Flow Rate to be measured；

Detection probe numbering, odd number is positioned on the left of common probe, and even number is on the right side of common probe, from the odd number detection probe that distance common probe is nearest, sequentially turns on detection probe and common probe.Such as from high order end number consecutively 1,3,5,2,4,6, from No. five detection probe conducting, then according to 2,4,6,1,3,5 circulations sequentially turn on detection probe and common probe.

The measuring method of a kind of above-mentioned flow velocity automatic measurement mechanism, comprises the following steps:

1) release pipe 1,2,6 detection probes of common probe being placed in flow position to be measured, release pipe 1 is in common probe 2 upstream, and agent feed bin 5 is higher than the water surface, in order to reagent flows out under gravity automatically from release pipe 1；

2) configuration high concentration ionization reagents (such as saline), concentration is not less than 50%, and injectant feed bin 5；

3) controller 6 control release pipe 1 lower end electromagnetic valve is opened, and flows out ionization reagents, is automatically switched off after 0.5 second, records electromagnetic valve opening time T₀；

4) controller 6 detects 6 detection probes electrical conductivity respectively and between common probe 2, initial conductivity G between detection probe and common probe 2₁、G₂、G₃、G₄、G₅、G₆, detection probe is uniformly distributed with common probe, adjacent between distance be Δ L, when ionization reagents flows through and detects between probe and common probe 2, when ionization reagents flows through numbered 5th detection probe, electrical conductivity G₃To change, the record corresponding time is T₁；Distance L between detection probe and release pipe 1_m；

5) then discharge the flow velocity between pipe 1 and common probe 2 and direction be:

$\begin{array}{cc}V=\sqrt{L_m^2+L^2}/(T_1-T_0)& \mathrm{\&alpha;}=\arctan (L_m/L)\end{array}.$

The above is only preferred implementation of the present utility model; it is noted that, for those skilled in the art; on the premise of without departing from this utility model principle, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection domain of the present utility model.

Claims (7)

1. flow velocity automatic measurement mechanism, it is characterized in that: include release pipe, common probe mediating recipe feed bin, described dose of feed bin front end connects with release pipe, it is provided with electromagnetic switch bottom release pipe, agent feed bin rear end is equipped with common probe and detection probe, common probe is connected with controller signals low level, and detection probe is connected with controller signals high level.

Flow velocity automatic measurement mechanism the most according to claim 1, it is characterised in that: described release pipe is hollow structure, and external diameter 3-5mm, internal diameter 1-2mm communicate with agent feed bin, and agent feed bin top sets injecting hole.

Flow velocity automatic measurement mechanism the most according to claim 1, it is characterized in that: described detection probe is n, n is the even number more than 1, common probe is positioned at same straight line with detection probe core, n detection probe is arranged symmetrically with along release pipe with the common probe line of centres, and adjacent detection probe separation or detection probe and common probe interval are the most equal.

Flow velocity automatic measurement mechanism the most according to claim 3, it is characterised in that: described common probe and all detection probe materials are rustless steel, external diameter 1-3mm.

5. according to the flow velocity automatic measurement mechanism described in claim 3 or 4, it is characterized in that: upstream, water movement direction arranged by described release pipe, common probe is arranged in downstream, water movement direction, distance between common probe and release pipe is L, L discharges pipe external diameter equal to 2-3 times, and wherein L is no less than 6mm；Common probe and detection probe length are equal, than release pipe range L.

Flow velocity automatic measurement mechanism the most according to claim 3, it is characterised in that: the value of described n is that 2,2 detection probes are respectively left detection probe and right detection probe, and controller controls left detection probe and right detection probe does not simultaneously turns on.

Flow velocity automatic measurement mechanism the most according to claim 3, it is characterised in that: described n value is the even number more than 2, and detection probe is Δ t with common probe ON time:

Δt<L/V_max/n/2

Vmax is current Peak Flow Rate to be measured；

Detection probe numbering, odd number is positioned on the left of common probe and by increasing numbering the most successively, even number is on the right side of common probe and by increasing numbering the most successively, from the odd number detection probe that distance common probe is nearest, sequentially turns on detection probe and common probe.