CN2287723Y

CN2287723Y - Flow rate monitor for slow speed fluid

Info

Publication number: CN2287723Y
Application number: CN 97200926
Authority: CN
Inventors: 吴继宗; 丛中斗; 刘焕良
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 1997-01-29
Filing date: 1997-01-29
Publication date: 1998-08-12
Anticipated expiration: 2007-01-29

Abstract

The utility model discloses an instrument used for monitoring the flow rate of the slow fluid in the flow injection analysis, which is characterized in that the outlet position of the fluid is provided with a pair of electrodes; an electrical pulse signal generated by a liquid drop conducting electrode is sent to a counter controller, therefore, the flow rate of the fluid can be detected. The instrument has simplicity, safety, and easy operation, and can remotely read data. The utility model is especially suitable for the analysis of the radioactive fluid and the work under the operating condition of strong acid base.

Description

A kind of monitor of rate of flow of fluid at a slow speed

A kind of monitoring device of rate of flow of fluid at a slow speed relates to fluid-flow rate monitoring field at a slow speed, particularly relates to the monitoring of rate of flow of fluid in the Flow Injection Analysis (FIA).

In the Flow Injection Analysis, the introducing of sample carrier band, dispersion, reaction and other reagent is finished by pump, and whether flow rate of liquid is stablized directly influences measurement result, therefore, accurately and timely understands flow rate of liquid and is very important for analysis result.For a long time in FIA, mostly adopt manual time-keeping number droplet or observed quantity cylindrical shell to amass to determine flow velocity, the method of operating that this is not only a kind of poor efficiency, falls behind, especially in fields such as nuclear industry, FIA often relates to the analysis to measure of fluids such as some radioactivity or highly basic strong acid, and operating personnel's protection safety is difficult to obtain assurance.Patent documentation (1) US 4869722 discloses a kind of drop bump level altitude liquid level that utilizes, and transmits pressure and acts on sensor below the drop, sensor record drop size and draw the technology of flow velocity; Two pieces of patent documentations (2) GB2118333 and two patented technologies of (3) WO92117227 are all utilized the light sensing in addition, thereby survey drop and drip number control flow velocity, more than measuring at a slow speed, the technology of rate of flow of fluid all needs some as pressure transducer, or special equipment such as light source and corresponding light checkout equipment, and these methods all are difficult to realize remote reading of data, so be unfavorable for the monitoring of poisonous fluid, also should not under the operating mode of strong acid, highly basic, use.

It is a kind of simple in structure that the purpose of this utility model is to provide, and not only is convenient to safe operation but also guarantee that the result is accurate, can realize remote reading of data, the monitor of rate of flow of fluid at a slow speed that is suitable for using under the various operating modes.

For achieving the above object, adopt following technical scheme:

A kind of monitor of rate of flow of fluid at a slow speed, comprise drop harvester and counter-controller, it is characterized in that the drop harvester comprises support, liquid collecting jar, is fixed in and vertically places outlet downward liquid conduits, a pair of being horizontally fixed on the support on the support, be in same vertical plane with liquid conduits and place liquid conduits to export the electrode of below, electrode separation is adjustable, the liquid conduits outlet is also adjustable with two interelectrode distances, and two electrode separations are less than the liquid conduits diameter; Counter-controller is the electric pulse count control device, produces electric impulse signal by the drop conduction electrode.

It is simple to the utlity model has device, and easy to operate, safe advantage because the drop collection separates with data read, can realize remote reading of data, realizes the security measurement to poisonous fluids such as radioactivity, and the electric pulse counting is highly sensitive, and counting accurately.

The present invention has following accompanying drawing:

Fig. 1 is a drop harvester structural representation;

Fig. 2 is the counter-controller structured flowchart;

Fig. 3 amplifies the shaping schematic diagram for pulse;

Fig. 4 is the gating pulse schematic diagram;

Fig. 5 is an impulse meter principle of work block diagram;

Fig. 6 is a circuit timing diagram;

Be described further below in conjunction with accompanying drawing:

The utility model utilizes liquid to become to drip state in liquid conduits 3 exits, make drop vertically drop in the middle of two poles 1 and 2, utilize liquid to have electric conductivity conducting the two poles of the earth 1 and 2, liquid disconnects again by the two poles of the earth 1 and 2, back, flowing liquid continuously makes the two poles of the earth be in conducting → disconnection → conducting → off-state like this, add up the conducting number of times by counter, demonstrate flow velocity.

Drop harvester shown in Figure 1, liquid conduits 3 is diameter of phi=3 millimeter polyfluortetraethylene pipes, also can be other plastic flexible pipe, two electrodes 1 and 2 for cross section diameter be 0.4 millimeter Pt-Rh wire or rhodium silk, two die openings are about 2 millimeters, liquid conduits 3 and two electrodes 1 and 2 are all at grade, adjust liquid conduits 3, two electrodes 1 and 2 relative position, adopt the jackscrew 7 that tightens cutting ferrule 6 and back to tighten and fix electrode, liquid conduits 3 also is fixed on the support 5 with jackscrew 8, make the drop that vertically drips from liquid conduits 3 exits just in time pass space between electrode 1 and 2, hang in the hydrops jar 4 that falls behind electrode 1 and 2 below, the two poles of the earth 1 and 2 have been communicated with counter-controller after being connected by drop.

Consider that this device will have constant weight (when being subjected to ectocine, can not move easily), can add the stainless steel outer cover at support 5.

Counter-controller is known controllable type electric impulse counter, provides a kind of realization step-by-step counting mode below.As shown in Figure 2, it comprises shaping circuit, pulse counting equipment and by a square-wave generator and the gating pulse system that monostalbe trigger is formed.Pulse amplified shaping circuit as shown in Figure 3, the electric pulse A that produces on the electrode 1 and 2 go to trigger by IC after Q1 (3DG6) is anti-phase ₁, R ₄, C ₂Deng the monostable trigger of forming, electric pulse of every like this generation, IC ₁3 ends just produce a high level, this level is through t=1.1R ₄, C ₂After the time-delay, become low level, promptly form a square wave B, after next electric pulse comes, same IC ₁3 ends be square-wave signal, the input pulse counter is used for counting, simultaneously IC ₁3 ends and ground between also be connected in series LED ₁, when 3 ends are high level, LED ₁Bright, so every of drop once, LED ₁With once bright, be used for the indication of droplet counting state.

The time control of the counting of impulse meter, maintenance and zero clearing is finished by the gating pulse system, Fig. 4 shows the schematic diagram of this system, and according to request for utilization, the droplet counting per minute refreshes once, to keep a period of time before refreshing, be convenient to the duty that the operator understands last minute drop.According to this requirement, in circuit design, by IC ₂, W ₁, C ₄Pulse oscillator Deng the EDM Generator of Adjustable Duty Ratio of forming provides counting, retentive control pulse C.The total period T of this oscillator=0.693 (R ₇+ R ₈+ W ₁) C ₄=80 seconds, according to the requirement of counter, high level kept, the low level counting.Therefore, by transferring W ₁Can realize the square-wave signal of low level 60S, high level 20S.This square-wave signal is counting, retentive control signal, LED ₂Be used for keeping indication.Utilize the negative edge that keeps to go to trigger by IC ₃, R ₁₁, C ₆The monostable trigger of forming just obtains zero clearing gating pulse D.Fig. 5 shows the principle of work block diagram of impulse meter, and principle in view of the above can obtain the circuit timing diagram of each pulse of Fig. 6.The IC that uses in the above circuit ₁, IC ₂, IC ₃Model can be NE555.

When the utility model uses the liquid conduits in the drop harvester 3 is linked to each other with flexible pipe with waste liquid outlet, can be online with the Flow Injection Analysis system, accurately and timely the reaction liquid flow velocity can be monitored the rate of flow of fluid of flow velocity at 0-10ml/min.Automatic clear entered count cycle next time after total drop number of per 60 seconds statistics of monitor, demonstration kept 20S, also can enter by manual reset key.

Claims

1. rate of flow of fluid monitor at a slow speed, comprise drop harvester and counter-controller, it is characterized in that the drop harvester comprises support (5), liquid collecting jar (4), be fixed in support (5) and go up the vertically downward liquid conduits (3) of placement outlet, a pair of being horizontally fixed on the support (5), be in same vertical plane with liquid conduits (3) and place liquid conduits (3) to export the electrode (1 and 2) of below, electrode (1,2) spacing is adjustable, liquid conduits (3) outlet and two electrodes (1,2) distance is also adjustable between, and two electrodes (1,2) spacing is less than liquid conduits (3) diameter; Counter-controller is the electric pulse counter-controller, produces electric impulse signal by drop conduction electrode (1 and 2).

2. according to the monitor of rate of flow of fluid at a slow speed of claim 1, it is characterized in that described counter-controller comprises shaping circuit, pulse counting equipment and by a square-wave device and the gating pulse system that monostalbe trigger is formed, impulse meter is counted demonstration to electric impulse signal, the control of controlled pulse system simultaneously, the time of control counting, maintenance, zero clearing and order.

3. the monitor of rate of flow of fluid at a slow speed as claimed in claim 1 is characterized in that described liquid conduits (3) and two electrodes (1 and 2) apart from after adjusting, and two electrodes (1 and 2) are tightened with the jackscrew (7) that tightens cutting ferrule (6) and back thereof and are fixed on the support (5).

4. according to claim 1 or 2 or the described monitor of rate of flow of fluid at a slow speed, it is characterized in that the outer button of described drop harvester support (5) steel cage.