CN2653462Y

CN2653462Y - Radio frequency admittance level controller

Info

Publication number: CN2653462Y
Application number: CN 03238182
Authority: CN
Inventors: 杜家强
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-15
Filing date: 2003-09-15
Publication date: 2004-11-03
Anticipated expiration: 2013-09-15

Abstract

The utility model relates to an admittance level controller which is used for the automatic detection and control of the liquid level and the feeding level in the oil, chemical engineering, electricity generating, cement, metallurgy and other industries. One side of the central hole of the flange, through a connector, is connected with a probe unit in which a post is arranged and whose external wall is sleeved orderly with an insulating sleeve, a protection level, an insulating and a fixing sleeve; the other side of the central hole of the flange, through a connector, is connected with a shell which is provided with a circuit board, on which a circuit, a high-frequency bridge circuit, a following circuit, a detecting and amplifying circuit and a comparison circuit are arranged and connected in an output-input order. The output and the input ends of the detecting and amplifying circuit and the following circuit are connected with the protection terminal through a conducting wire, and the output and the input end of the detecting and amplifying circuit and the following circuit are connected with the probe unit through a conducting wire.

Description

Radio frequency admittance admittance level controller

Technical field

The utility model relates to a kind of liquid level and the automatic detection of material level and radio frequency admittance admittance level controller of control that is applicable to industries such as oil, chemical industry, generating, cement, metallurgy.

Background technology

It is reported that the level controller that uses roughly is mechanical at present, tuning-fork type, capacitive and the nuclear radiation formula.Its mechanical and level controller tuning-fork type has easy to wear, serviceable life weak point such as weak point, swinging of signal.Its capacitive level controller has and is subjected to the work on the spot environment to do the problem of sorrow.The level controller of its nuclear radiation formula has the problem to human body harm.

Summary of the invention

The purpose of this utility model is in order to overcome deficiency and the problem that above-mentioned level controller exists, a kind of safe and reliable, good stability of performance that has is provided, long service life, applied range, can measures resisting medium and eliminate the radio frequency admittance admittance level controller of sensor probe adhered materials characteristics such as control action influences.

The purpose of this utility model is to realize like this; side in the flange center hole is connected with the inner by jointed tubular workpieces and is provided with binding post; outer wall is with insulation sleeve successively from the connecting tube end; protected level; insulation sleeve; the probe of fixed cover; in being connected with by jointed tubular workpieces, the opposite side in flange center hole is provided with the shell spare of circuit board; on circuit board, be furnished with output successively; the power circuit that input connects; the high frequency bridge circuit; follow circuit; detect amplifying circuit; comparator circuit; output circuit; in the output that detects amplifying circuit and follow circuit; be connected with protected level by lead between input, in the output of follow circuit and high frequency bridge circuit; be connected with probe by lead between input.

The utility model and background technology are relatively, owing to adopted above-mentioned technical solution, therefore the measuring method that not only makes admittance changes comprehensively the impedance of measured medium and capacitive reactance together, and makes that it has had that performance is safe and reliable, good stability, long service life, applied range, can measure resisting medium and eliminate the sensor probe adhered materials to characteristics such as control action influences.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is a circuit block diagram of the present utility model.

Fig. 3 is a circuit diagram of the present utility model.

Embodiment

Describe a specific embodiment of the present utility model in detail below in conjunction with accompanying drawing.

Referring to Fig. 1; Fig. 2; Fig. 3; flange 6 is flanges that have center screw; in the center screw of flange 6 by the attaching nut 7 that has been threaded; attaching nut 7 on flange 6 right sides prolongs pipe 8 by being threaded; at the other end that prolongs pipe 8 by the connecting tube 5 that has been threaded; probe 13 by being threaded and making in connecting tube 5 by stainless steel; outer wall at probe 13 is with the screwed poly-tetrafluoro insulation sleeve 10 of an end successively; stainless steel protection level 11; poly-tetrafluoro insulation sleeve 10; stainless steel fixed cover 12; insulation sleeve 10; protected level 11 is fixed on the probe 13 by register pin; fixed cover 12 is welded on the probe 13; probe 13 is connected with connecting tube 5 by screwed poly-tetrafluoro insulation sleeve 10, is screwed with binding post 9 in probe 13 terminations that are positioned at prolongation pipe 8 by screw thread.In the attaching nut 7 in flange 6 left sides by the poly-tetrafluoro connecting tube 5 that has been threaded, the other end at connecting tube 5 has connecting pipe by the end that has been threaded, the other end has end cap 2, and sidepiece has inlet wire plug 3, and inside is equipped with the aluminium casing 4 of circuit board 1.End cap 2 is connected with housing 4 by screw thread with plug 3.On circuit board 1, be furnished with successively power circuit 19, the high frequency bridge circuit 14 of exporting, import connection; follow circuit 15, detection amplifying circuit 16, comparator circuit 17, output circuit 18; between the output that detects amplifying circuit 16 and follow circuit 15, input, is connected with protected

level

11,13 is connected with popping one's head in by lead in the output of follow circuit 15 and high frequency bridge circuit 14, between importing by lead.Its power circuit 19 is by resistance R 1, R2, transformer T, diode V1, V2, V3, V4, capacitor C 1, C2, C3, C4 and integrated package of pressure-stabilizing 7805,7905 constitute, the end of its R1 is connected with the input end of the end of R2 and T, the other end of R1 is connected with the input end of the negative pole of power supply and T, the other end of R2 is connected with the positive pole of power supply, the cathode output end of T is connected with the positive pole of V1, the cathode output end of T is connected with the negative pole of V4, V1 connects with V2, V3 connects with V4, the negative pole of V1 and V3 negative pole, the end of C1,7805, the end of C3 connects, the positive level of the positive pole of V2 and V4, the end of C2,7905, the end of C4 connects, C1, the other end series connection of C2,7805 and 7905 series connection, C3, the other end series connection of C4 is at C1, C2 and C3, be connected with lead on the series conductor of C4; Output circuit [18] is by resistance R 3, R4, R5, R6, R7, R8, R13, R26, R27, light emitting diode D1, D2, diode V5, triode Q1, integrated package U4, capacitor C 5 and relay J constitute, an end and the C3 of its R3,7805 connect, the other end of R3 and R13,8 pin of C5 and U4 are connected, 9 pin of the other end of C5 and U4 are connected with R4, U4 is by 10 pin and R5, Q1, J, R8, the C1 series connection, be connected with the D1 of V5 and series connection at the two ends of J, R7, the emission of Q1 reports e to be connected with R6, the other end ground connection of R6, the other end of R13 are connected with 7 pin of U3 also and R27, D2, the R26 series connection; Comparator circuit 17 is by resistance R 19, R20, R21, R22, R23, R24, R25, R28, potentiometer W, capacitor C 15, C16, integrated package U1, U3 and pushbutton switch [B1] constitute, its W and R26, R25 series connection back and R21, R22, R23, the R24 parallel connection, R22, R23, R24 is controlled by B1 respectively, 3 pin of U1 are connected with W, 1 of U1,2 pin are connected with R19, R19 connects with R20, the end of C15 is connected with 4 pin of U1 and ground connection, the other end of C15 is connected with the other end of R21, R20 is connected with 5 pin of U1,6 of U1,7 pin connect and are connected with the end of R28, and the other end of R28 is connected the other end ground connection of C16 with 5 pin of U3 and the end of C16; Detecting amplifying circuit 16 is by resistance R14, R15, R29, capacitor C 10, C11, probe 5, protected level 2 and integrated package U2, U3, U4 constitutes, 6 pin and the C11 of its U3, C12, the end of R29 connects, C11, the other end ground connection of C10, the other end of R29 is connected with 11 pin of U4,13 pin and the R14 of U4, the end of R15 connects, 1 of the other end of R14 and U4,8 pin of 5 pin and U2 are connected, the other end of R15 is connected with 1 pin of U2,3 pin of U2 are connected with the end of C14 and R18,2 pin of U2 and C14 other end ground connection, C13 is connected with the other end of R18 and 1 pin of U3, C13, be connected with protected level 2 between R17, the other end ground connection of R17,3 pin of U3 are connected with probe 5 and are connected with C12; Follow circuit 15 is to be made of resistance R 16, R17, R18, capacitor C 12, C13, C14 and integrated package U2, and its R16 is connected with 4,1 pin of U3, and C12 is connected with L; High frequency bridge circuit 14 is to be made of resistance R 9, R10, R11, R12, R30, capacitor C 17, toggle switch B2, inductance L, crystal oscillator M and integrated package U4,12 pin of its U4 are connected with 3 pin of R12 and U4, the other end of R12 is connected with M with the R10 of electric bridge, 2 pin of U4 are connected with 4 pin of R9, the R11 of electric bridge and U4,6 pin of U4 are connected with M with the R9 of electric bridge, the other end of R11 is in series with R30, C17, L, the other end of R30 is connected with B2, and the other end of B2 is connected with the other end of R10, C17, L and ground connection.

Its principle of work:

Do not provide high-frequency signal to make follow circuit 15, detection amplifying circuit 16, comparator circuit 17, output circuit 18 keep balances by high frequency bridge circuit 14 when having material in the container, light emitting diode D2 is bright; When filling material in the container, probe 13 contact with material change pop one's head in and chamber wall between impedances makes high frequency bridge circuit 14 unbalance, amplifying circuit 16, comparator circuit 17, output circuit 18 output signals after testing, light emitting diode D1 is bright, relay J is moved; When only popping one's head in 13 adhered materials or when being not full container, shield no signal output through protected level 11 and follow circuit 15.

Claims

1; a kind of radio frequency admittance admittance level controller; include flange [6]; it is characterized in that a side at flange [6] center pit is connected with the inner by connecting tube [5] and is provided with binding post [9]; outer wall is with insulation sleeve [10] successively from connecting tube [5] end; protected level [11]; insulation sleeve [10]; the probe [13] of fixed cover [12]; in being connected with by connecting tube [5], the opposite side of flange [6] center pit is provided with the housing [4] of circuit board [1]; on circuit board [1], be furnished with output successively; the power circuit [19] that input connects; high frequency bridge circuit [14]; follow circuit [15]; detect amplifying circuit [16]; comparator circuit [17]; output circuit [18]; in the output that detects amplifying circuit [16] and follow circuit [15]; be connected with protected level [11] by lead between input, in the output of follow circuit [15] and high frequency bridge circuit [14]; be connected with probe [13] by lead between input.

2, radio frequency admittance admittance level controller according to claim 1, it is characterized in that power circuit [19] is by resistance [R1], [R2], transformer [T], diode [V1], [V2], [V3], [V4], electric capacity [C1], [C2], [C3], [C4] and integrated package of pressure-stabilizing [7805], [7905] constitute, the end of its R1 is connected with the input end of the end of R2 and T, the other end of R1 is connected with the input end of the negative pole of power supply and T, the other end of R2 is connected with the positive pole of power supply, the cathode output end of T is connected with the positive pole of V1, the cathode output end of T is connected with the negative pole of V4, V1 connects with V2, V3 connects with V4, the negative pole of V1 and V3 negative pole, the end of C1,7805, the end of C3 connects, the positive level of the positive pole of V2 and V4, the end of C2,7905, the end of C4 connects, C1, the other end series connection of C2,7805 and 7905 series connection, C3, the other end series connection of C4 is at C1, C2 and C3, be connected with lead on the series conductor of C4; Output circuit [18] is by resistance [R3], [R4], [R5], [R6], [R7], [R8], [R13], [R26], [R27], light emitting diode [D1], [D2], diode [V5], triode [Q1], integrated package [U4], electric capacity [C5] and relay [J] constitute, an end and the C3 of its R3,7805 connect, the other end of R3 and R13,8 pin of C5 and U4 are connected, 9 pin of the other end of C5 and U4 are connected with R4, U4 is by 10 pin and R5, Q1, J, R8, the C1 series connection, be connected with the D1 of V5 and series connection at the two ends of J, R7, the emission of Q1 reports e to be connected with R6, the other end ground connection of R6, the other end of R13 are connected with 7 pin of U3 also and R27, D2, the R26 series connection; Comparator circuit [17] is by resistance [R19], [R20], [R21], [R22], [R23], [R24], [R25], [R28], potentiometer [W], electric capacity [C15], [C16], integrated package [U1], [U3] and pushbutton switch [B1] constitute, its W and R26, R25 series connection back and R21, R22, R23, the R24 parallel connection, R22, R23, R24 is controlled by B1 respectively, 3 pin of U1 are connected with W, 1 of U1,2 pin are connected with R19, R19 connects with R20, the end of C15 is connected with 4 pin of U1 and ground connection, the other end of C15 is connected with the other end of R21, R20 is connected with 5 pin of U1,6 of U1,7 pin connect and are connected with the end of R28, the other end of R28 is connected the other end ground connection of C16 with 5 pin of U3 and the end of C16; Detecting amplifying circuit [16] is by resistance [R14], [R15], [R29], electric capacity [C10], [C11], probe [5], protected level [2] and integrated package [U2], [U3], [U4] constitutes, 6 pin and the C11 of its U3, C12, the end of R29 connects, C11, the other end ground connection of C10, the other end of R29 is connected with 11 pin of U4,13 pin and the R14 of U4, the end of R15 connects, 1 of the other end of R14 and U4,8 pin of 5 pin and U2 are connected, the other end of R15 is connected with 1 pin of U2,3 pin of U2 are connected with the end of C14 and R18,2 pin of U2 and C14 other end ground connection, C13 is connected with the other end of R18 and 1 pin of U3, C13, be connected with protected level 2 between R17, the other end ground connection of R17,3 pin of U3 are connected with probe 5 and are connected with C12; Follow circuit [15] is to be made of resistance [R16], [R17], [R18], electric capacity [C12], [C13], [C14] and integrated package [U2], and its R16 is connected with 4,1 pin of U3, and C12 is connected with L; High frequency bridge circuit [14] is to be made of resistance [R9], [R10], [R11], [R12], [R30], electric capacity [C17], toggle switch [B2], inductance [L], crystal oscillator [M] and integrated package [U4], 12 pin of its U4 are connected with 3 pin of R12 and U4, the other end of R12 is connected with M with the R10 of electric bridge, 2 pin of U4 are connected with 4 pin of R9, the R11 of electric bridge and U4,6 pin of U4 are connected with M with the R9 of electric bridge, the other end of R11 is in series with R30, C17, L, the other end of R30 is connected with B2, and the other end of B2 is connected with the other end of R10, C17, L and ground connection.