CN2290036Y

CN2290036Y - Liquid level measuring instrument

Info

Publication number: CN2290036Y
Application number: CN 96230194
Authority: CN
Inventors: 赵德宝
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-03
Filing date: 1996-07-03
Publication date: 1998-09-02
Anticipated expiration: 2006-07-03

Abstract

The utility model discloses a liquid level measuring instrument, which is characterized in that the transformation and the voltage regulation of a power source can be realized, then the power source can be respectively supplied to a probe, preposition recognizers, a judgment circuit, a display circuit and a circulation scanner, a plurality of electrodes arranged on the probe are respectively connected with the input end of the preposition recognizer, the output end of each preposition recognizer and the circulation scanner are respectively connected with each judgment circuit, and the output of the preposition recognizer and the circulation scanner can be respectively sent to each display circuit by each judgment circuit. The utility model has the advantages of simple structure low cost, convenient installation and reliable measurement of liquid level. The dynamic supervision of the liquid level in a water pool or a water tank can be realized, and the utility model can also be used for the liquid level measurement of other liquid which is not inflammable, explosive and corrosive.

Description

A kind of fluid level measuring instrument

The utility model relates to the technical field of measuring instrument, and specifically a kind of measuring liquid level that is used for is especially measured the instrument of water level.

Fluid level measuring instrument of the prior art mostly is to be applied on the industrial and bigger civilian pond, the kind of fluid level measuring instrument has pressure at present, types such as machinery, ultrasound wave, resistance, electric capacity, though the precision that has is higher, automatically the ability of control is strong, but often has deficiencies such as structure is complicated, cost is high, installation is difficult, antijamming capability is weak.Area at some water scarcities; because of water supply capacity limited; Running-water Company adopts regularly and supplies water to the user; has plenty of several hours every day; have or even jede Woche only supplied water several hours; therefore the user need set up cistern and solve problem of water consumption; be the cleaning in the protection pond; often build enclosed type pond (lid is arranged but be difficult for opening) but the water yield in the enclosed type pond what just the instrument of needs measurement water level indicated; existing instrument is difficult for being accepted by people because of problems such as price, installations.

The purpose of this utility model is to provide a kind of fluid level measuring instrument that can be applicable in the less demanding occasion of measuring accuracy, and it has, and cost is low, the characteristics of easy installation.

The technical solution of the utility model is to realize like this, it mainly comprises shell, transformation stabilized voltage supply, the preposition recognizer of popping one's head in, decision circuitry, display circuit and scan round device, it is characterized in that: the power supply after the transformation voltage stabilizing is supplied with probe respectively, preposition recognizer, decision circuitry, display circuit, scan round device; Several electrodes in the probe connect the input end of each preposition recognizer respectively, and the output terminal of each preposition recognizer is connected with each decision circuitry respectively with the scan round device, delivers to each display circuit respectively by the output terminal of decision circuitry.

The utility model utilizes the conductive characteristic of water, in the pond by putting a probe that has highly different some electrodes, therefrom take out the water level signal in pond, after preposition recognizer and decision circuitry, deliver to display circuit, on the panel of instrument, do corresponding the demonstration, to tell the water level in the user pond, this apparatus structure is simple, cheap (showing every less than 200 yuan of Renminbi), easy for installation, measuring liquid level is reliable, can carry out dynamic monitoring to the water level of pond (case) etc., also can be used for nonflammable explosive, the level gauging of other liquid like the non-corrosiveness, electrical conductivity and water.

Fig. 1 is a block diagram of the present utility model

Fig. 2 is an electrical connection diagram of the present utility model

The utility model will be further described below in conjunction with drawings and Examples.

Transformation stabilized voltage supply 6 of the present utility model, preposition recognizer 2, decision circuitry 3, scan round device 5 all are contained in the shell of instrument, and display circuit 4 is contained on the panel of instrument; Probe 1 is a metallic cable, comprising some stainless steel electrodes spaced apart from each other and a lead that connects power supply, be placed in the pond (case) that needs measuring liquid level, power supply 6 after the transformation voltage stabilizing is supplied with probe 1 respectively, preposition recognizer 2, decision circuitry 3, display circuit 4, with scan round device 5, several electrodes in the probe 1 connect the input end of each preposition recognizer 2 respectively, on-off circuit that each preposition recognizer is made up of transistor and resistance capacitance and the shaping negative circuit of forming by phase inverter, physical circuit is: the substrate of transistor T1 by resistance R 1 with the probe in electrode J1 be connected the grounded emitter of transistor; Collector links to each other with an end of phase inverter G and resistance R 2 respectively, and the other end of phase inverter is connected to the input end of the Sheffer stroke gate C in the decision circuitry, and the other end of resistance R 2 is connected to stabilized voltage supply.Electrode in the probe of present embodiment, preposition recognizer, decision circuitry, display circuit all adopt 15, because of their selected component parameters and function all identical, so only one of them is described, decision circuitry 3 in the utility model, display circuit 4, scan round device 5 and stabilized voltage supply 6 are to adopt prior art substantially, and mark A, the B among Fig. 2 is integrated package 74LS164; C, D, E, F are 74LS00; G, H, I are 74LS04, each decision circuitry is made up of the Sheffer stroke gate of 74L,S00 two input ends, its two input ends receive the signal from shaping negative circuit in the preposition recognizer and scan round device respectively, when the signal of two input ends all is noble potential " 1 ", decision circuitry output " 0 " current potential makes corresponding positions work in the display circuit; Each display circuit is made up of light emitting diode and resistance R 3; The scan round device mainly is made up of two 74LS164 integrated packages, and its output terminal is delivered to each decision circuitry respectively, and its major function is that another input end current potential to each decision circuitry carries out cyclic access; Regulator block in the stabilized voltage supply is 7805, and power transformer is elementary to be provided with two groups of 110V windings, by the switching of selector switch K, satisfies the different requirement of different regions line voltage.

The course of work of the present utility model is: required 15 point electrodes of differing heights of drawing on the RVV16 core cable of selecting for use is done to pop one's head in, because the voltage of setting+5V on the core of probe 1, after whole probe places the pond, utilize the electric conductivity of water, can deliver to preposition recognizer at differing heights and water electrodes in contact signal respectively with in the pond, when the electrode of the transistor base in connecting preposition recognizer does not contact with water, transistor does not have bias voltage, be in cut-off state, and electrode is in case contact with water, on the probe+5V voltage will conduct electricity by water, deliver to transistorized base stage by the electrode on the probe, make transistor obtain bias voltage, by the cut-off state degree is state of saturation, like this along with probe is gone up contacting of each electrode and water, just can on transistor collector separately, export electronegative potential " 0 " signal (then not exporting noble potential " 1 ") if do not contact with water, after corresponding phase inverter 74LS04 shaping is anti-phase, deliver to the input end in each decision circuitry, another input end in each decision circuitry is from the scan round device, when the signal of two input ends all is " 1 ", Sheffer stroke gate in the decision circuitry is output as " 0 " current potential, when decision circuitry output noble potential " 1 ", pressure drop can't make it luminous on the light emitting diode of display circuit, have only the decision circuitry of working as to be output as electronegative potential " 0 " current potential, when decision circuitry output noble potential " 1 ", pressure drop can't make it luminous on the light emitting diode in the display circuit, have only when decision circuitry is output as electronegative potential " 0 ", pressure drop on the light emitting diode makes it luminous, because being another input end current potential to each decision circuitry, the scan round device carries out cyclic access, the logic of more than accessed decision circuitry satisfies, introducing, then the corresponding positions of display circuit is just luminous, in whole access cycle, visit by turn from low level a to high position, go round and begin again, on the display panel of instrument, can produce the effect of simulation mercury slug indicated water level, simultaneously especially as Colour lamp for fastival and holiday, it is bright suddenly to flash, existing artistic effect has also satisfied the requirement that the user wants to learn the pond middle water level.

Claims

1. fluid level measuring instrument, it mainly comprises shell, transformation stabilized voltage supply, probe, preposition recognizer, decision circuitry, display circuit and scan round device, it is characterized in that: the power supply after the transformation voltage stabilizing is supplied with probe, preposition recognizer, decision circuitry, display circuit, scan round device respectively; Several electrodes on the probe are connected to the input end of each preposition recognizer respectively, and the output terminal of each preposition recognizer is connected with each decision circuitry respectively with the scan round device, delivers to each display circuit respectively by each decision circuitry again.

2. by the described a kind of fluid level measuring instrument of claim 1, it is characterized in that: the physical circuit of each preposition recognizer is: the base stage of transistor (T1) is connected with electrode (J1) in popping one's head in by resistance (R1); The grounded emitter of transistor; Collector links to each other with the end of phase inverter with resistance (R2) respectively, and the other end of phase inverter is connected to Sheffer stroke gate one input end in the decision circuitry, and the other end of resistance (R2) is connected to stabilized voltage supply.

3. by claim 1 or 2 described a kind of fluid level measuring instruments, it is characterized in that: probe is a metallic cable, comprising some stainless steel electrodes spaced apart from each other and a lead that connects power supply.

4. by claim 1 or 2 described a kind of fluid level measuring instruments, it is characterized in that; Electrode in the probe, preposition recognizer, decision circuitry, display circuit all adopt 15.