CN2200196Y

CN2200196Y - Temp. monitor

Info

Publication number: CN2200196Y
Application number: CN 94228945
Authority: CN
Inventors: 杨维玉
Original assignee: SHENYANG INST OF COMPUTING TEC
Current assignee: SHENYANG INST OF COMPUTING TEC
Priority date: 1994-06-21
Filing date: 1994-06-21
Publication date: 1995-06-07
Anticipated expiration: 2004-06-21

Abstract

The utility model belongs to a temperature monitor, which is composed of a sensor, a comparator, a temperature limiting trigger, a conversion switch, a driver, a delay display circuit and a power supply. Temperature signals which are collected by the sensor are input to the driver by the comparator, the trigger and the conversion switch, the driver controls directly electric heating (cooling) by the delay display circuit, simultaneously, a blower is controlled, the temperature of a tested temperature point is utilized to control run of a temperature control device. The utility model has the advantages of simple structure, reliable and stable operation and high sensitivity, and achieves the automatic monitoring of a temperature control system.

Description

Temp. monitor

The utility model belongs to a kind of device for monitoring temperature.

All adopt heat the to reach purpose of (or refrigeration) of cooperatively interacting of electric heater and blower fan in the occasion of some electrical heating (refrigeration) at present.Usually adopt open loop control, when needs are heated (refrigeration), by the manual control power-supply unit, make electric heater heating (or refrigeration), though this kind device has omitted electric-control system, but makes troubles to production run in the place of ask for something strictness, and control temperature instability, sometimes do not reach the requirement of temperature technical indicator, even cause unnecessary economic loss.

For solving the deficiency of above attemperating unit, the purpose of this utility model provides a kind of temperature monitor, utilizes temperature sensor and control circuit to reach attemperating unit, realizes the purpose of monitoring automatically.

Structural design of the present utility model is achieved in that this watch-dog is by sensor, comparer, limit warm trigger, switch, driver, time-delay shows and power supply is formed, its connecting relation is that the front is a temperature sensor, the signal output and the reference voltage signal of sensor input to comparer simultaneously, comparer output connects the warm trigger of limit, trigger output connects switch, switch output connects driver, driver directly connects electric heating (refrigeration) equipment and display by delay circuit, its circuit connects as shown in Figure 2, the detailed electrical schematic diagram as shown in Figure 3, sensor adopts two kinds of AD590 and WM570.AD590 makes the double ended type temperature sensor with integrated technique, and it can by the measurement to this electric current, just can obtain required temperature value by electric current that is directly proportional with temperature of constant ratio output of 1 μ A/K in-55 ℃～+ 150 ℃ scopes.Adopt AD590 mainly due to it three advantages to be arranged: (1) because it is electric current output (output impedance is greater than 10M Ω), is hundreds of meters connections and switch transition in the use and does not do any correction.(2) power supply voltage range is bigger ,+4V～30V, very little to current affects.(3) low in energy consumption, be generally 2mW.

Sensor WM570 is the PN junction sensor, and temperature is in-55 ℃～150 ℃ scopes, and 1 ℃ of every rising is flow through the WM570 electric current when the 100 μ A left and right sides, and the WM570 both end voltage drops to 2.1mV, is linear change.Take WM750 and PN-4E to show supporting use and can show certain some temperature value.

Sensors A D590 connects as shown in Figure 4, uses two three-way SH3 to insert and connects AD590 as the temperature acquisition end, puts into the temperature controlled compartment position, is connected the input temperature controller with two J11-1, J11-2 with SH6 by long line.

Sensor WM570 connects shown in Fig. 4 e, and WH570 puts into respectively with two A, B near the AD590, and A, B link to each other with the PN-4E thermometer by SH2-1, SH2-2, K switch 1 respectively, demonstrate this 2 temperature values.

Comparer is by IC3(LM393) and peripheral circuits form R8, IC1(TL431), RP4, R10 constitute accurate reference voltage.Regulate RP4 and can obtain the reference voltage size.RP5, R11 constitute the B comparer end of oppisite phase magnitude of voltage of IC3, and end of oppisite phase voltage is regulated by RP5; RP3, R9 constitute the A comparer in-phase end magnitude of voltage of IC3, and in-phase end voltage is regulated by RP3.And sensor links to each other with the backward end of the A of R12, IC3, the B in-phase end of IC3.Temperature variation is determined this point voltage value.When temperature raises, when 2.5 terminal voltages of IC3 are higher than 3 ends of IC3, the 1 end output low level of IC3,7 ends output high level.When temperature reduces, when 2.5 terminal voltages of IC3 are lower than 6 ends of IC3; The 1 end output high level of IC3,7 end output low levels.2.5 terminal potentials of determining IC3 when temperature are between U3, U6 the time, and 1 end, 7 ends are output as high level.

Limit warm trigger: this trigger is by IC4(CD4011) constitute.As shown in Figure 3, when trigger R end was low level (the S end is intercalation for high electricity), trigger output terminal Q1, Q2 were high level (Q1, Q2 are low level).When the R end was high level, trigger output terminal Q1, Q2 were low level (Q1, Q2 are high level).

Switch: when switch K2, K3 placed 2,3 to connect respectively, the expression temperature controller was used for electrical heating; When K2, K3 placed 1,3 positions, the expression temperature controller was used for refrigeration.

Driver: driver is that triode BG2 and resistance R 14, triode BG3 and resistance R 16 are formed.If K switch 2,

K3 place

1,3 terminations to lead to the position respectively.BG2 conducting when trigger output Q1 is high level, BG3 conducting when Q2 is high level.BG2, BG3 ended when Q1, Q2 were low level.When K switch 2,

K3 place

1,3 end positions respectively, BG2, BG3 conducting and by depending on trigger output terminal Q1, Q2.Driver is to increase the relay coil electric current.

Relay: relay J 1, J2 are respectively applied for control blower fan and electric heater (refrigerator), and whether the relay adhesive is depended on BG2, BG3 conducting and ended.When BG2, BG3 conducting, J1, J2 adhesive, when BG2, BG3 ended, J1, J2 discharged.D4, D5 diode formation relay coil are let out Power Generation Road in the circuit.

Delay circuit: delay circuit is by IC5(LM555N), resistance R 5, R6, R7, R18, capacitor C 9, C10, relay J 3, diode D3 form.

When relay J 1 adhesive, 2 pin of IC5 are connected by resistance R 18, time-delay a period of time (time length depends on R5, C9 size), relay J 3 adhesives make the J2 adhesive, can reach like this to make the J1 adhesive earlier, the blower fan running makes the J2 adhesive again, control electrical heating (refrigerator).

Show: comprise that the temperature controlled compartment temperature shows, overtemperature shows, low temperature shows, the blower fan running shows and electrical heating (refrigeration) shows.The temperature controlled compartment temperature shows directly tests WM570 by the PN-4E thermometer, by K switch 1, obtains A point and B point temperature value, is come out by liquid crystal display.

Overtemperature shows and is made up of light emitting diode CR2, resistance R 13.When overtemperature, 1 pin of IC3 is output as low level, and 7 pin are high level, and the CR2 conducting is luminous.

Low temperature shows and is made up of light emitting diode CR1, resistance R 13, prescribes a time limit when temperature is lower than down, and 1 pin of IC3 is output as high level, and 7 pin are low level, and the CR1 conducting is luminous.

The blower fan running shows to be made up of CR3, resistance R 15, when the BG2 conducting, and the J1 adhesive, the conducting of CR3 light emitting diode is luminous.

Electrical heating (refrigeration) demonstration is made up of light emitting diode CR4, resistance R 17, when the BG3 conducting, and the J2 adhesive, light emitting diode CR4 conducting is luminous.

Power supply: power principle figure as shown in Figure 7, civil power is through K switch 0, fuse F1, temperature relay J4, J5, transformer transformation, drag flow filtering.Drive the p42 of BG1(T by three-terminal voltage-stabilizing power module LM317 voltage stabilizing), output+12V voltage is supplied with temperature controller work, and this circuit has overvoltage protection, is made up of stabilivolt Z1, Z2, R19 and controllable silicon STR1.When+when 12V voltage surpassed+15%, controllable silicon STR1 conducting was blown fuse F2.This circuit also has overcurrent protection, uses F1, F2.

Advantage of the present utility model: simple in structure, line design is reasonable, and working stability is reliable, and is highly sensitive, realized the automatic monitoring of temperature control system, in the strict place of some heat supplies (refrigeration), can be used as the supporting use of temperature control system and miscellaneous equipment.

The utility model detailed structure is provided by following examples and accompanying drawing.

Fig. 1 is a kind of temperature monitor shape assumption diagram;

Fig. 2 is a kind of temperature monitor controlling party block diagram;

Fig. 3 is a kind of temperature monitor electrical schematic diagram;

Fig. 4 is that a kind of temperature monitor sensor connects figure;

Fig. 5 is a kind of temperature monitor time-delay electrical schematic diagram;

Fig. 6 is a kind of temperature monitor power supply electrical schematic diagram.

Its controlling party block diagram as shown in Figure 2, I is a sensor, II is a comparer, the III warm trigger that exceeds, IV is a switch, V is a driver, VI, VII, VIII are the time-delay display circuit.Two sensors are placed on the temperature controlled compartment position, and the centre is input in the temperature monitor with cable connection, because temperature controller is controlled by circuit, can temperature controlled compartment are controlled in a certain temperature range by blower fan and electric heater (refrigeration).

Claims

1, a kind of temperature monitor, it is characterized in that this temperature controller is by sensor (I), comparer (II), limit warm trigger (III), switch (IV), driver (V), time-delay shows (VI) (VII) (VIII) and power supply (IX) composition, its connection is that the front is sensor (I), the signal output and the reference voltage signal of sensor (I) input to comparer (II) simultaneously, comparer (II) output connects limit warm trigger (III), trigger (III) connects switch (IV), switch (IV) output connects driver (V), and driver (V) directly connects electric heating (refrigeration) equipment and display (VII) (VIII) by delay circuit (VI) simultaneously.

2, by the described watch-dog of claim 1, it is characterized in that the used sensor of watch-dog (I) is AD590 and WM570, with AD590 as the temperature acquisition end, connect temperature controller with long line, sensor WM570 puts into respectively near the AD590, connects thermometer, shows this temperature value by long line.

3, by the described watch-dog of claim 1, it is characterized in that comparer (II) is by IC3(LM393) and peripheral circuits form, R8, IC1(TL431), RP4, R10 constitute accurate reference voltage, RP5, R11 constitute the A of comparer (II) end of oppisite phase IC3, KP3, R11 constitute comparer (II) in-phase end magnitude of voltage, and sensor (I) links to each other with the backward end of the A of R12, IC3, the B in-phase end of IC3.

4,, it is characterized in that this driver (V) is made up of three-phase pipe BG2 and resistance R 14, three-phase pipe BG7 and resistance 16 by the described watch-dog of claim 1.K switch 2, K3 place 1,3 terminations to lead to the position respectively.