CN207763768U - A kind of liquid level detection device of fuzzy positioning - Google Patents

Abstract

The utility model discloses a kind of liquid level detection devices of fuzzy positioning, including can provide the power supply of constant current signal driving source, and power supply tool is connected with detection components there are two electrode on two electrodes；The detection components at least there are two；The detection components include two conducting wires；Resistance and a semiconductor piece there are one being separately connected on two conducting wires；Two semiconductor pieces are placed side by side；The rear end of two conducting wires is connect with the front end of two conducting wires in second detection components respectively in first detection components.The utility model is connected using two-wire system serial mode, without making high and low sequencing problem clear, solves the problems, such as that the detection of water level sensor difference liquid level is obscured；Liquid can be effectively reduced as liquid detecting electrode using semiconductor piece and contact the risk for causing oxidation to lead to faulty sensor with interior metal；The semiconduting properties of the semi-conducting material can effectively avoid the malfunction caused by impurity adhesive electrodes under dirty water environment simultaneously, to improve the accuracy of liquid water level detecting.

Description

A kind of liquid level detection device of fuzzy positioning

Technical field

The utility model is related to sensing device more particularly to a kind of liquid level detection devices of fuzzy positioning.

Background technology

The sensor of the general detection liquid level of existing market is broadly divided into electric pole type and mechanical float-ball type；Electrode liquid level passes Sensor electrode is exposed in air or water, and easily corroding oxidation over time leads to sensitivity decrease or even cannot detect water Position, especially electrode exposed under dirty water environment, which are easy winding impurity, causes level sensing erroneous judgement occur；Machinery is floating Due to relatively low using mechanical structure sensitivity, the especially extremely easy damage of mechanical structure over time causes ball-type liquid level sensor Output is not acted.

Both liquid level sensors be all on off state output, liquid level critical condition and be easy to cause frequent switch Malfunction, to affect the actual effect of level sensing；And both liquid level detecting sensors all can only be single-point detection, One sensor can only detect the fluid level condition of a point, the ladder height detection of multiple spot liquid level be cannot achieve, so using When the ladder detection that needs multiple sensors being individually placed to different positions to realize liquid level, this mode makes engineering construction It is cumbersome, it needs largely to connect up, increases workload, and be not easy the test position corresponding to distinguishing sensor in detection section, It is easy to obscure.

Invention content

The utility model aim is to solve the above problems, and devises a kind of level sensing dress can be used for fuzzy positioning It sets.

To achieve the goals above, the technical solution of the utility model is：

A kind of liquid level detection device of fuzzy positioning, including the power supply of constant current signal driving source can be provided, which has Two electrodes, power supply tool are connected with detection components there are two electrode on two electrodes；It is characterized in that：The detection components are extremely There are two few；The detection components include two conducting wires；Resistance and a semiconductor piece there are one being separately connected on two conducting wires； First conducting wire front end of first detection components is connect with anode, and the second conducting wire front end is connect with cathode, and two semiconductor pieces are simultaneously Discharge is set；The rear end of two conducting wires connects with the front end of two conducting wires in second detection components respectively in first detection components It connects.

Further, it is provided with liquid level display between described two electrodes and detection components.

Further, plug is arranged in the front end of two conducting wires in the detection components, and jack is arranged in the rear end of two conducting wires.

Compared with prior art, the utility model has the advantages and positive effects of：

The utility model is connected using two-wire system serial mode, only uses both threads cable, construction cost is greatly saved.And Use serial mode between detection components, sequencing be it is fixed with it is specific, it is high with low sequencing problem without making clear, it is thorough Bottom solves the problems, such as that the detection of water level sensor difference liquid level is obscured；Use semiconductor piece can be with as liquid detecting electrode It effectively reduces liquid and contacts the risk that causes to get rusty or aoxidize and then lead to faulty sensor with interior metal；This is partly led simultaneously The semiconduting properties of body material also reduce electric conductivity of the interior metal electrode when there is water covering, especially in dirty water environment Under can effectively avoid malfunction caused by impurity adhesive electrodes, to improve the accuracy of liquid water level detecting.

Description of the drawings

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property It puts, other drawings may also be obtained based on these drawings.

Fig. 1 is detection components structural schematic diagram；

Fig. 2 is the structural schematic diagram of the utility model.

Specific implementation mode

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work The every other embodiment obtained, any modification, equivalent replacement, improvement and so on should be included in the utility model Within protection domain.

As depicted in figs. 1 and 2, a kind of liquid level detection device of fuzzy positioning, including power supply, power supply have there are two electrode, Constant current signal driving source can be provided, detection components are connected on two electrodes；It is characterized in that：The detection components at least two It is a；The detection components include two conducting wires；Resistance 2 and a semiconductor piece 3 there are one being separately connected on two conducting wires；First 1 front end of the first conducting wire of a detection components W1 is connect with anode 4, and 6 front end of the second conducting wire is connect with cathode 5, two semiconductor pieces 3 It is placed side by side；In first detection components W1 the rear end of two conducting wires respectively with before two conducting wires in second detection components W2 End connection.

In Fig. 1, semiconductor piece 3 is the metal battery core for being coated with semiconductor layer, 3 front end series resistor 2 of semiconductor piece, two and half Bridging has equiva lent impedance 7 between conductor block 3.When no liquid impregnates the detection components, equiva lent impedance 7 is infinitely great, two Semiconductor piece is equivalent to off-state, and when there is liquid to impregnate the detection components, equiva lent impedance 7 generates, therefore two electrodes, A complete electrical circuit will be constituted with resistance, between equiva lent impedance 7.

In Fig. 2, it is assumed that the excitation constant current signal value of detection device output is I, and threshold limit value voltage is U, the equivalent resistance of water Anti- range is RL ~ RH, and magnitude relationship is (10K<RL<RH<100K), build-out resistor R1, R2, R3, R4 are 50K resistance, and R5, R6 are The equiva lent impedance of water（R5=R6）.

When not having detection components that liquid did not had the sensing device, the equiva lent impedance of R5, R6 water are infinity, that is, are sensed Equiva lent impedance between 2 points of device electrode S1, S2 is infinity.Therefore the equivalent voltage between theoretical 2 points of top electrode S1, S2 U1=I*R is equivalent=infinitely great.Due to detection device provide maximum voltage be U, 2 points of front electrode S1, S2 it Between equivalent voltage U1=U；

When liquid did not only have sensing device detection components W2, equiva lent impedance RW2=R3+R4+R6 of detection components W2= 100K+R6, at this time sensing device electrode S1, the equiva lent impedance that 2 points of S2 be R1+R2+RW2=R1+R2+R3+R4+R6= 200K+R6, therefore equivalent voltage U2=I*R=I* (200K+R6) between 2 points of electrode S1, S2；

When liquid did not had sensor detection components W1, W2 simultaneously, equiva lent impedance RW2=R3+R4+ of detection components W2 Equiva lent impedance RW1=R1+R2+R5=100K+R5. of R6=100K+R6, detection components W1 sensing device electrode S1 at this time, The equiva lent impedance that 2 points of S2 is R1+R2+R5//RW2=100K+R5//RW2, therefore the equivalent electricity between 2 points of electrode S1, S2 Press U3=I*R=I* (100K+R5//RW2)；

By U1=U known to 3 kinds of conditions above；

U2 = I*(200K+R6)；

U3 = I*(100K+R5//RW2)。

Due to R5=R6, U3=I* (100K+R6//RW2)<I*(100K+R6)；

By front known conditions RL<=R5=R6<=RH, i.e. 10K<=R5=R6<=100K；

Therefore 210K*I<=U2 <= 300K*I；

110K*I <U3 < 200K*I。

There is lower relation of plane U1 when U takes voltage to be more than the value of 300K*I>U2>U3；

Therefore by U1, detection voltage under tri- kinds of states of U2, U3 can fuzzy Judgment go out liquid to be in which detection high Degree.

It is provided with liquid level display between described two electrodes and detection components.By U1, the magnitude relationship between U2, U3 The fuzzy height of liquid level can be clear that after comparing on liquid level display.

Plug is arranged in the front end of two conducting wires in the detection components, and jack is arranged in the rear end of two conducting wires.Pass through plug It connect the use length of connection the utility model as needed that can be more convenient with jack, is brought just to the use of people Profit.

Claims (3)

1. a kind of liquid level detection device of fuzzy positioning, including the power supply of constant current signal driving source can be provided, which has two A electrode is connected with detection components on two electrodes；It is characterized in that：The detection components at least there are two；The detection group Part includes two conducting wires；Resistance and a semiconductor piece there are one being separately connected on two conducting wires；The of first detection components One conducting wire front end is connect with anode, and the second conducting wire front end is connect with cathode, and two semiconductor pieces are placed side by side；First detection group The rear end of two conducting wires is connect with the front end of two conducting wires in second detection components respectively in part.

2. the liquid level detection device of fuzzy positioning as described in claim 1, it is characterised in that：Described two electrodes and detection group Liquid level display is provided between part.

3. the liquid level detection device of fuzzy positioning as described in claim 1, it is characterised in that：It is led for two in the detection components Plug is arranged in the front end of line, and jack is arranged in the rear end of two conducting wires.