CN2232141Y

CN2232141Y - Time-controlled thermostat

Info

Publication number: CN2232141Y
Application number: CN 94225995
Authority: CN
Inventors: 张桂喜
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-23
Filing date: 1994-03-23
Publication date: 1996-07-31
Anticipated expiration: 2004-03-23

Abstract

The instrument is composed of machine box, clock display screen, timer switch button, temperature value display screen, time control circuit, over-temp. alarm circuit, solid-state relay and temp. regulator, and features use of advanced digital electronic circuit to realize digital operation and timing of clock, automatic shutdown and start-up in preset time, and use of digital temp. regulator.

Description

Time control constant temperature instrument

The utility model relates to instrument and meter, is the instrument of a kind of time control and constant temperature, is called for short time control constant temperature instrument.Be widely used in the scientific research department of industries such as petrochemical complex, metallurgy, plastic processing, food processing, in laboratory, the test unit.

The instrument that automatic temperature control system in the prior art adopts, model is more outmoded, and measuring accuracy is lower, and function imperfection and instrument fault rate are higher.Adopt in the particularly old-fashioned temperature controller with A.C. contactor in long-term the use, the contact easily produces loose contact, and contact easily adhesion of sparking back is not cut off the power supply after reaching the intensification value, causes overtemperature even burns out firing equipment and the accident of instrument.

The purpose of this utility model is: manufacturing accuracy height, failure rate are low, dependable performance, multiple functional time control constant temperature instrument.Above-mentioned purpose realizes by following design:

Adopt advanced digitalized electron circuit to realize clock run timing digitizing, and cut off the power supply automatically after can arriving duration, dispose digital humidostat, select novel control element---solid-state relay for use.Reach little, the dependable performance of observing and controlling temperature value deviation.Purpose safe in utilization.

Now 1,2,3,4 pair of the utility model further specifies in conjunction with the accompanying drawings:

Among Fig. 1, the instrument outward appearance mainly is made up of cabinet [1], clock display screen [2], power switch [5], instrument panel [17], temperature value display screen [14], temperature control setting value dial [10] etc.Other parts are:

Regularly close pilot lamp [3], regularly open pilot lamp [4], timing knob [6] is transferred and is divided knob [7], regularly opens knob [8], regularly closes knob [9], and controlling value is set [10].Dial overtemperature alarm silencer switch [11], temperature control fine tuning potentiometer [12], alarming value is set potentiometer [13], temperature value display screen [14] burner on light [15], alarm lamp [16].

The back plate of this instrument adopts the manufacturing of insulating gel plank, wherein has instrument nameplate [18], fuse holder [19] and two terminal boards to constitute.

Each unit number is described as follows in the accompanying drawing 2:

[18] instrument nameplate, [19] fuse holder, [20] thermo-compensator, [21] thermocouple signal input "+" end, [22] thermocouple signal input "-" end, [23], [24] jointing temp compensating resistance, [25] ac power input end " C " phase, [26] ac power input end " B " phase, [27] ac power input end " A " phase, [28] ac power input end " center line ", [29] ac power input end " center line ", [30] instrument ground terminal, [31] ac power output " A " phase, [32] ac power output " B " phase, [33] ac power output " C " phase.

The theory diagram of this instrument sees also accompanying drawing 3.

Its principle of work is as follows: mainly by power transformer [34], regulator rectifier circuit [35], and the clock controller [36] of the utility model characteristic, clock display [37], overtemperature alarm [39] constitutes, and with the auxiliary reclay [40] of prior art, trigger [42], solid-state relay [43] is formed together, in the frame of broken lines [38], [44 is this instrument peripheral components ([38]--thermometric original paper), ([39]--load), [41] in the frame of broken lines are XST--131 type humidostat for prior art, low-voltage ac signal by the output of transformer [34] secondary winding is delivered to overtemperature alarm [39] through regulator rectifier circuit [35], when controlled temperature value out-of-limit, this alarm [39] sends chimes of doom, and be cut to the trigger pip of trigger [42] automatically, the function of clock controller [36] can realize the time figure operation by clock display [37], and can realize the time control of instrument timing start-up and shutdown, by humidostat [4]] deliver to solid-state relay [43] through the control signal of trigger [42], the make-and-break time of its signal is subjected to the control of time scale circuit in the humidostat [41], the output signal of solid-state relay [43] is for exchanging 380--to load [44], (resistance-type electric furnace).

The circuit of this instrument and embodiment see also accompanying drawing 4, are illustrated.

The controlling object of this embodiment is the temperature control instrument that exchanges the input of 380V three-phase type power supply, output, can carry out the constant temperature and timing controlled (the constant temperature instrument of single-phase type resistance-type electric furnace of furnace temperature to the resistance-type electric furnace of 6KW--12KW, compare with present embodiment, be that 220V exchanges just at the input power supply, out-put supply is that 220V exchanges, and the load of control is the following resistance-type electric furnace of 6KW).Its circuit working principle is as follows:

One. the digital display humidostat that the selected prior art of the utility model is produced, model is a time scale for " XST--131 " its regulative mode, in the practical application, the 5V direct current signal of the power supply rectifier and voltage regulator circuit output of being made up of ZD3 rectifier in the circuit and dielectric capacitance device C13-C15 and 7805 type three terminal regulators is often opened/normally closed contact to the auxiliary reclay J2's of XST--131 type instrument, as control original paper solid-state relay J2-1, J2-2, the trigger pip of J2-3 is controlled the make-and-break time of AC power to firing equipment.The signal of thermopair is connected in the signal input part of humidostat XST-131 table by compensating wire from electric furnace.

Two. clock controller is a characteristic of the present utility model, mainly form plesichronous LED electronic clock by N2 integrated circuit LM8363 type, N1 is 14 grades of frequency dividers of band crystal oscillator, the quartz crystal oscillator of 32720HZ is carried out the time base input as N2 of 60HZ signal that 9 frequency divisions obtain, S3, S4 can cooperate S1, S2 to set startup and shutdown respectively constantly, and LM8363 has two timing outputs, and this machine utilizes decade counter.CD4017 and two groups of NAND gate circuit cooperate the realization timing start-up with LM8363, the shutdown function, 29 pin that the 3rd pin Q0 of CD4017 connected LM8363, end (high level is effective) is forbidden in i.e. timing 2, crus secunda Q1 connects 27 pin of LM8363, end is forbidden in i.e. timing 1, because CD4017 Q0 when original state is a high level, Q1 etc. are low level, the timing 1 (start) of the LM8363 of institute is opened, regularly 2 (shutdown) are closed, and when the timing start-up time arrived, timing output 26 pin became high level, trigger the N3 counting, make Q1 become high level, Q0 is low level, makes regularly 1 to close, pilot lamp V4 extinguishes, regularly 2 open G3 conducting, auxiliary reclay J1 adhesive, pilot lamp V3 lights, when the timing shutdown time arrived, N2 was triggered once more, because the Q2 (4 pin) of N3 links to each other with 15 pin (clear terminal) through the two-stage phase inverter, N2 is resetted get back to original state, wait for start arrival constantly next time.

Temperature overtemperature automatic alarm circuit, by ZD2, QL25 type rectifier, C13,14,15, R16, the rectifying voltage regulator that voltage stabilizing diode 2CW5 (DW1) forms is delivered to by R7-R10, C10, G1, the batch (-type) oscillator that G2 forms, the main element that oscillator adopted is two 3DC202A type transistors, the signal that the interrupted conducting of two pipes produces is delivered to news Chinese percussion instrument YDX-3, when relay J 3 actions, contact J3-1 adhesive, power supply is by logical, and YDX-3 type news Chinese percussion instrument sends interrupted alarm sound, the control of auxiliary reclay J3 in the XST-131 type humidostat that the break-make of J3-1 contact is subjected to produce from prior art, when alarm setting value overlaps with observed temperature, auxiliary reclay J3 gets electronic work in the instrument, contact J3-1 adhesive, and warning circuit sends the sound, cut to " noise elimination " position chimes of doom when K switch 2 and to eliminate

Each parameter declaration in the circuit theory diagrams:

One. resistance R 1-R16:1M 51K 510 Ω 260 Ω 200 Ω 82K 47K 20K 47K6.2K 100K 4.7K 3K 2.7K 360 Ω 1.5K

Two. electric capacity: C15/15P C2-C15:0.01UF 100UF/16V 100UF/16V 0.01UF220UF/25V 220UF/25V 0.01UF 0.22UF/15V 4.7UF/25V 0.01UF/16V0.22UF/16F 4.7UF/25V.

Three. diode V1-V21 N4001 type V3-V4 light emitting diode

The effect of utility model has reached aforesaid purpose, this accuracy of instrument height, easy break-down not, there is not the loose contact problem, multiple functional, have digital display time, timing back Auto Power On, regularly shut down automatically in the back, digital display dut temperature value, and can realize automatic constant temperature control, and can be used as the necessary instrument that uses various resistor-type furnace equipments, also be the renewal product of prior art.

Claims

1. a thermostatical instrument of realizing the automatic control of heat time heating time comprises the clock timing controlled, and devices such as overtemperature alarm, adjustment, solid-state relay is characterized in that:

A. clock display screen [2], temperature value display screen [14] are contained on the instrument panel [17] of instrument cabinet [1] together,

B., clock controller [36] and clock display [37] are housed in cabinet [1], overtemperature alarm [39], regulator rectifier circuit [35], trigger [42] solid-state relay parts such as [43],

C. circuit is by the digital display type plesichronous clock controller [36] of single unit system, the humidostat of time scale formula [41], and the circuit of novel power control component--solid-state relay [43] and overtemperature alarm [39] constitutes,

D. the circuit of clock controller [36] and clock display [37] mainly is made up of N2 integrated circuit LM8363, N3 integrated circuit CD4017 and N1 integrated circuit CD4060 etc.

2. by the described instrument of claim 1, it is characterized in that fuse holder [19] being housed, instrument nameplate [18] and power end daughter board [25]-[33], signal end daughter board [21]-[24] on the insulcrete at cabinet [1] rear portion.

3. by the described instrument of claim 1, it is characterized in that circuit part mainly by clock controller [36], trigger [42], solid-state relay formations such as [43].

4. by the described instrument of claim 1, it is characterized in that cabinet [1] is with aluminum alloy materials with mould the iron plate processing and manufacturing again.

5. by the described instrument of claim 1, it is best to it is characterized in that described solid-state relay [43] is installed in the interior bottom radiating effect of cabinet.

6. by the described instrument of claim 1, it is characterized in that on instrument panel [1], concentrate the parts that whole outside contact are set, comprise power switch, pilot lamp, button, potentiometer etc.

7. by the described instrument of claim 1, [39] circuit that it is characterized in that described overtemperature autoalarm is by ZD2, QL25 type rectifier, compositions such as diode.

8. by the purposes of the described instrument of claim 1--6, can be applicable to 220V or 380V AC power to practical timing controlled of the furnace temperature of resistance-type electric furnace and thermostatic control.