CN1181319C

CN1181319C - Oscillation type liquid level display control alarming instrument

Info

Publication number: CN1181319C
Application number: CNB01138851XA
Authority: CN
Inventors: 吴长喜
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-17
Filing date: 2001-12-17
Publication date: 2004-12-22
Anticipated expiration: 2021-12-17
Also published as: CN1427247A

Abstract

The present invention provides an oscillation type liquid level display control alarming instrument which is mainly composed of a measuring-transducing part, a measuring part, an alarm part and a control part. The present invention can be used for the measurement of liquid levels and the alarm and control of upper and lower limits, and at the same time, unstable AC signals output by an oscillation type sensor can be converted into standard voltage or current signals. Voltage, current or contact signals can also be output according to the requirements of users. The present invention has the characteristics of flexible use, wide range of application, novel structure, convenient operation and low production cost.

Description

Oscillation type liquid level display control alarming instrument

Technical field

The present invention relates to a kind of liquid level display control alarming instrument.

Background technology

The present domestic oscillation type liquid level controller that adopts U.S.'s import is by after receiving the AC signal of osciducer by the height generation of liquid level, exports various signals, comes control executing mechanism, realizes the control to liquid level.In application, there is following problem: the 1. unfixed AC signal of fluid level controller receiving sensor output, can not the outputting standard signal, therefore can't be connected with miscellaneous equipment.2. set-point is difficult for setting.Can not in time report to the police when 3. liquid level transfinites.4. show inaccurate.5. the error of reference mark generation is big.

Summary of the invention

At the problem and shortage that existing oscillation type liquid level controller exists in application, the object of the present invention is to provide a kind of multi-functional oscillation type liquid level display control alarming instrument, this table is except that having accurate measurement, control, warning function.AC signal in the different range can be converted to standard signal as 1～5V, 4～20mA can connect in external unit, thereby has reduced the appearance of present oscillation type liquid level controller fault in application, makes liquid level control, operates easier, safer.

The present invention is composed as follows:

Measuring to become send part I to comprise: oscillatory type sensor 1, and AC amplifier 2, current rectifying and wave filtering circuit 3, totalizer 4, constant pressure source 5, amplifier 6, totalizer 4 ', constant pressure source 5 ', choosing and sample circuit 7, amplifier 6 ', totalizer 4 " and, output circuit 8, constant pressure source 5 ".

Measure portion II comprises: sample circuit 9, totalizer 4 , constant pressure source 5 , amplifier 6 ", A/D change-over circuit 10, decoding drives display circuit 11.

Warning part III comprises: comparer 12,12 ', constant pressure source 5 " ", 5 " " ', sound light alarming circuit 13.

Control section IV comprises: set-point setting apparatus 14,

amplifier

6 , 6 " ", totalizer 4 " ", 4 " " ', control circuit 15, the choosing with sample circuit 7 ', constant pressure source 5 " " ", output circuit 8 '.

Implementation of the present invention is as follows:

Owing to measure the signal of being exported when the AC signal of oscillatory type sensor 1 output that becomes among the part I descends less than liquid level when liquid level rises, send the signal of output circuit 8 outputs among the part I corresponding for making the measurement change with liquid level, so take following measure: the signal wire that disconnects amplifier 6 outputs, adjustment constant pressure source 5 ', making constant pressure source 5 ' output signal is zero, at this moment transfer constant pressure source 5 "; make output circuit 8 output signal lower limits; adjust constant pressure source 5 '; transfer simultaneously amplifier 6 ' enlargement factor; make output circuit 8; higher limit of output signal, then amplifier 6 output signals are received totalizer 4 ', at this moment amplifier 6 output signals are opposite with constant pressure source 5 ' phase of output signal.When liquid level at the last constant pressure source 5 of transferring in limited time, make totalizer 4 be output as zero, at this moment the higher limit of output circuit 8 output signals; When liquid level is being prescribed a time limit down, transfer the enlargement factor of amplifier 6, make the lower limit of output circuit 8 output signals, measure portion II samples the signal of output circuit 8, by after the constant pressure source 5 zeroing, again by 6, and " amplify and divide three the tunnel; the one tunnel carries out numeral demonstration; one tunnel part III that goes to report to the police, do alerting signal, the one tunnel goes control section IV to do measuring-signal.Set set-point by set-point setting apparatus 14, amplify through amplifier 6 again, obtain deviation signal by totalizer 4 " ", when the deviation signal of totalizer 4 " " output is zero, by regulating constant pressure source 5 " " ", make the lower limit of output circuit 8 ' output signal, when the deviation of totalizer 4 " " output number meets the demands mutually; transfer the enlargement factor of amplifier 6 " ", make the higher limit of output circuit 8 ' output signal.

The invention is characterized in measure to become the variation of the oscillatory type sensor 1 that send among the part I by liquid level, exportable different AC signal, by measuring the exportable standard signal in output circuit 8 backs that becomes part I, as 4～20mA, 1～5V; Or by the each several part adjustment, output circuit 8, the electric current of exportable various scopes, voltage signal; Feature of the present invention also is; Output circuit 8 among the control section IV ' adjust exportable standard signal as 1～5V by each several part; 4～20mA; also exportable off-gauge voltage; current signal or contact point signal; in addition because this instrument has adopted liquid level bound warning measure; and advanced digitizing technique, make this table stable and reliable for performance, strengthened the reliability and the safeguard measure of liquid level control simultaneously to installing.Cost is low, structure, use, easy to maintenance.

Description of drawings

Fig. 1 is a circuit diagram of the present invention.

Embodiment

Specify the present invention below in conjunction with accompanying drawing:

When liquid level changed at the detecting element place of oscillatory type sensor 1, the AC signal of the output of oscillatory type sensor 1 was also along with variation, and this signal is sent into the in-phase end of AC amplifier 2.After AC amplifier 2, the AC signal after obtaining amplifying is sent into rectification, filtering circuit 3, and behind overcommutation, filtering circuit 3, output and the corresponding direct current signal of AC signal size, this direct current signal is sent into totalizer 4.In order to make liquid level when a certain position of detecting element of oscillatory type sensor 1, the signal of totalizer 4 outputs is zero, so designed constant pressure source 5, the signal of totalizer 4 outputs is sent into the end of oppisite phase of amplifier 6, after amplifier 6 amplifications, send into totalizer 4 '; In order to make liquid level when the strong signal of lower bound oscillatory type sensor 1 output, output circuit 8 output signal lower limits, so designed constant pressure source 5 '; Totalizer 4 ' output signal send into the choosing and sample circuit 7, by the choosing with sample circuit 7 after, the signal of output is greater than zero, this signal go into amplifier 6 ' end of oppisite phase, after amplifier 6 ' amplification, the signal that when send into totalizer 4 input signal of "; in order to make totalizer 4 " was zero, the lower limit of output circuit 8 output signals was so design constant pressure source 5 "; by totalizer 4 " is sent into output circuit 8, by obtaining needed various signal behind the output circuit 8.After sample circuit 9 receives the signal of output circuit 8 outputs, be sent to totalizer 4 , when making sample circuit 9 output minimum signals, the signal of totalizer 4 output is zero, so designed constant pressure source 5 , signal by totalizer 4 is sent into amplifier 6 "; " signal after amplifying divides remove display circuit at three the tunnel: the one tunnel through amplifier 6, one tunnel part III that goes to report to the police, one the tunnel goes the totalizer 4 " " of control section IV, go to a road of display part behind A/D change-over circuit 10, to export digital signal, show through decoding, driving, display circuit 11 laggard line number words again.A road of the part III that goes to report to the police give respectively comparer 12 and comparer 12 ', constant pressure source 5 " " capping alarming value is when amplifier 6 value of output signal " greater than constant pressure source 5 " " output valve the time, sound light alarming circuit sends the sound and light alarm signal; Constant pressure source 5 " " ' setting lower limit alarming value is when amplifier 6 value of output signal " less than constant pressure source 5 " " ' output valve the time, sound light alarming circuit sends the sound and light alarm signal.

Set-point setting apparatus 14 is set set-point, insert the end of oppisite phase of amplifier 6 then, through sending into totalizer 4 " " after the amplifier 6 amplification, through totalizer 4 " " output bias signal, deviation signal is sent into control circuit 15 to be handled, through send into behind the control circuit 15 choosing and sample circuit 7 ', through the choosing with sample circuit 7 ' after, can will export according to user's request greater than the defeated or minus signal of zero signal, send into the end of oppisite phase of amplifier 6 " " then, signal after amplifier 6 " " amplifies send into totalizer 4 " " ', when being zero for the output signal that makes amplifier 6 " ", output circuit 8 ' output signal non-vanishing, so designed constant pressure source 5 " ", by totalizer 4 " " ' signal give output circuit 8 ', by the enlargement factor and the constant pressure source 5 " " of resonance-amplifier 6 " " " output valve, output circuit 8 ' can obtain the needed signal value output of user.

Set-point setting apparatus 14 of the present invention can adopt the set-point driver chuck, contactless switch or potentiometer; Control circuit 15 can adopt proportional control, proportional plus integral control, ratio, integration, differential control, time scale control, output circuit 8,8 ' can adopt the constant current source output circuit, constant pressure source output circuit, relay tip output circuit.

Claims

1, a kind of oscillation type liquid level display control alarming instrument, send part [I] by measuring to become, measure portion [II], warning part [III] and control section [IV] are formed, it is characterized in that with off-gauge AC signal by measure to become send part output circuit [8] after, the electric signal of exportable various standards or the various signals that meet the demands, exportable various standard signals of control section output circuit [8 '] or satisfy the various signals of customer requirements; Wherein measure to become send part [I] by side signal transmission to comprising successively: oscillatory type sensor [1], AC amplifier [2], whole ripple filtering circuit [3], measure to become and send part first adder [4], measure to become and send part first amplifier [6], measure to become and send part second adder [4 '], measure to become and send part choosing and sample circuit [7], measure to become and send part second amplifier [6 '], measure to become send part the 3rd totalizer [4 "] and measure to become and send part output circuit [8]; and measure to become and send part first adder [4] to send part first constant pressure source [5] to be connected with measuring to become; measure to become and send part second adder [4 '] to send portion's second constant pressure source [5 '] to be connected with measuring to become, measurement change send part the 3rd totalizer [4 "] and measurement change to send part the 3rd constant pressure source [5 "] to be connected; Send the signal of output circuit [8] output in the part [I] corresponding for making the measurement change with liquid level, take following measure: disconnect and measure the signal wire that part first amplifier [6] output is sent in change, adjusting to measure to become send part second constant pressure source [5 '] to make its output signal be zero, at this moment adjust to measure become and send part three constant pressure sources [5 "]; make to measure to become the lower limit of sending part output circuit [8] output signal; adjust to measure to become and send part second constant pressure source [5 ']; transfer simultaneously to measure to become the enlargement factor of sending part second amplifier [6 ']; make to measure to become the higher limit of sending part output circuit [8] output signal; will measure then to become to send part first amplifier [6] output signal to receive to measure to become and send part second adder [4 '], and at this moment measure to become and send part first amplifier [6] output signal to send part second constant pressure source [5 '] phase of output signal opposite with the measurement change; When liquid level transfers the measurement change to send part first constant pressure source [5] in limited time last, making to measure to become send part first adder [4] to be output as zero, at this moment measure and become the higher limit of sending part output circuit [8] output signal, when liquid level is being prescribed a time limit down, transfer to measure to become the enlargement factor of sending part first amplifier [6], make to measure to become the lower limit of sending part output circuit [8] output signal.

2, according to the described instrument of claim 1, it is characterized in that measure portion [II] by side signal transmission to comprising successively: sample circuit [9], measure portion totalizer [4 ] and measure portion amplifier [6 "], wherein measure portion totalizer [4 ] is connected with measure portion constant pressure source [5 ]; [6 "] output signal divides three the tunnel to the measure portion amplifier, leads up to A/D change-over circuit [10] and decoding, driving, display circuit [11] to carry out numeral and show, the one tunnel goes the part [III] of reporting to the police, and one the tunnel removes control section [IV].

3, according to the described instrument of claim 1, the part [III] that it is characterized in that reporting to the police comprising: first comparer [12], second comparer [12 '] and sound light alarming circuit [13], first comparer [12] and warning part first constant pressure source [5 " "] be connected, second comparer [12 '] and warning part second constant pressure source [5 " " '] be connected; [6 "] output signal is imported first comparer [12] and second comparer [12 '] to the measure portion amplifier, first comparer [12] and second comparer [12 '] signal input sound light alarming circuit [13].

4, according to the described instrument of claim 1, it is characterized in that control section [IV] by side signal transmission to comprising successively: set-point setting apparatus [14], control section first amplifier [6 ], control section first adder [4 " "], control circuit [15], control part sorting and sample circuit [7 '], control section second amplifier [6 " "], control section second adder [4 " " '] and control section output circuit [8 '], wherein control section second adder [4 " " '] be connected with control section constant pressure source [5 " " "]; Measure portion amplifier [6 "] output signal input control section first adder [4 " "].

5,, it is characterized in that measuring becoming and send part output circuit [8] and control section output circuit [8 '] to adopt constant current source output, constant pressure source output or contact output according to claim 1 or 4 described instrument.

6,, it is characterized in that control circuit [15] adopts proportional control, time scale control, proportional plus integral control or proportion integration differentiation control according to the described instrument of claim 1.