CN2219653Y

CN2219653Y - Automatic electric heating lunch-box

Info

Publication number: CN2219653Y
Application number: CN 95205067
Authority: CN
Inventors: 赵方伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-20
Filing date: 1995-03-20
Publication date: 1996-02-14
Anticipated expiration: 2005-03-20

Abstract

The utility model relates to an automatic electric heating lunch box, which adds an electronic automatic control device on the basis of a common electric heating lunch box. The device adopts an integrated multistage frequency divider with a vibrator as a timer for controlling the start of the heating time of the electric heating lunch boxes. Then a time base integrated circuit is used as the controller of the heating time length and a controlled silicon trigger concurrently. The automatic device has the advantages of high circuit integration DEG, convenient debugging, and low cost. The entire circuit is arranged inside a miniplug box for pulling and inserting with a lunch box body conveniently. The automatic electric heating lunch box can heat automatically when time arrives according to the prearranged time in advance, and can switch off automatically after finishing heating. The automatic electric heating lunch box is characterized in convenient cleaning, electricity saving, worry saving, and time saving.

Description

The automatic electric heating lunch box

The utility model relates to a kind of electric heating mess tin of heating automatically.

Existing insulation electric heating mess tin needs the people in use and looks after, to connect power supply on time, also to look after heat time heating time, sometimes long owing to heat time heating time, the too mashed or burnt paste of meal heat also has such situation, and ante cibum is unmanned or do not have the time and look after, very time-consuming to the Shi Xianre that has a meal, therefore being badly in need of a kind of controlling oneself can " look after " electric heating mess tin of controlling oneself.

The purpose of this utility model just provides a kind of like this by the time of presetting in advance heating automatically then, the electric heating mess tin of automatic outage insulation after heating finishes.

The purpose of this utility model is achieved in that increases an electronic automatic control device on the basis of common insulation electric heating mess tin, this device is by adjustable long-time timer (being used for controlling initial heat time heating time); Controller heat time heating time (being used for controlling the length of heat time heating time) two parts are formed.

The utility model will be further described below in conjunction with accompanying drawing,

Fig. 1 is a structural representation of the present utility model, and (1) is the lunch box shell, is made by heat resistant plastice, (2) form by the flame-retardant hard polyurethane foaming plastic perfusion for heat-insulation layer, (3) lunch box inner casing, for the aluminium sheet of coated non-viscous paint is made (4) thermostat relay, (5) are district ZHP infrared type Electric radiant Heating Film, be bonded in the bottom of inner casing (3), (6) asbestos cloth is used for heat insulation between heat-insulation layer and the Electric radiant Heating Film, (7) lid, (8) overheating fuse, (9) electronics is controlled plug automatically.

Electronic automatic control circuit of the present utility model, by shown in Figure 2, adjustable long-time timer (10), be that 14 grades of frequency divider IC1 by a band oscillator are core, being equipped with peripheral circuit forms, its frequency of oscillation is by being connected on resistance on the pin of [9] [10] outward, the decision of the time constant of electric capacity, long delay T=1.12 ¹⁴(R3+Rw1) C4 changes the Rw1 resistance; Time during adjustable adjusting.[3] [2] [1] [7] pin is an output pin, and its output regularly is respectively T, 1/2T, 1/4T.0.001T.C3 and R1 form start-up circuit, are high level at power connection moment pin [12], make the Ic1 internal counter ask zero.

The pin of Ic1 [3] [2] [1] [7] output high level makes the internal oscillator failure of oscillation by diode D3 when being timed to.D4 is the Light-Emitting Diode of Displaying timer.The high level of timing Ic1 output then makes triode BG1 saturated, and negative pulse of collector output is coupled to the input of controller heat time heating time (11) through electric capacity c5.

The longest timing of this timer can reach 24 hours.

Controller heat time heating time (11) is made up of for core is equipped with peripheral circuit time-base integrated circuit 7555.The pin of Ic1 [6] [7] is connected to resistance R 8, and on the contact of W2 and C6, pin [5] connects negative supply by capacitor C 7, forms a typical single stabilization delay circuit.Negative pulse by timing circuit (10) output makes the monostable circuit upset, and capacitor C 8 begins charging, and pin [3] output high level makes Light-Emitting Diode D5 bright, and passes through the trigger electrode of resistance R 11 control bidirectional triode thyristor BG2, makes its conducting.The Electric radiant Heating Film energising, the heating beginning.Its heat time heating time is by the time constant decision of R8, RW2 and C6.

Adjust RW2 and just can regulate heat time heating time.When capacitor C 6 charged to 1/3 supply voltage, monostable circuit overturn automatically, and pin [3] becomes low level makes controllable silicon shutoff stopping heating.

The 220V alternating voltage is through the C1 step-down, and D2 voltage stabilizing D1 drag flow C2 filtering output 10～12V DC voltage uses for control circuit.

This heat time heating time, controller can be 10～60 minutes the adjustment time.Electronic automatic control circuit is owing to all adopt semiconductor elements, and is relatively more responsive to temperature, so this part element is contained in the plastic plug box, carries out structure and electric connecting with socket on the lunch box.With band switch K1 and potentiometer W1, W2 device on the panel of plug (9), be used for adjusting initial heat time heating time and heat time heating time length.

The automatic electric heating lunch box, because the unmanned, control power is bigger again, and security is even more important, adopts thermostat relay (4) for this reason, and the actuating of relay when temperature surpasses 110 ℃ is cut off the electricity supply.As it is molten disconnected above 130 ℃ of overheated safety fuses (8) to control invalid temperature, deenergization.Thereby guarantee being perfectly safe of this device.

The ZHP type Electric radiant Heating Film that the utility model adopted has thermal starting time weak point, good long service life of auto-temperature-limiting character and the high characteristics of the thermal efficiency.Owing to adopt the infrared type base plate higher by about 5% than the general Electric radiant Heating Film thermal efficiency, improve about 30% than the electrothermal tube thermal efficiency, power savings is very obvious.

Owing to adopt electronic automatic control device, under unmanned's situation, once next () thus can have hot rice and dish and save a large amount of time, owing to can adjust heat time heating time, want heat a bit with regard to long some heat time heating time, temperature can be followed one's bent once this heat time heating time of short point, be unlikely to too mashed with food heat, or burn.Because the lunch box box portion adopts separate structure with automatic control plug, box portion is easy to pull up carries and clear Xian, and it is a kind of easy to use that these advantages become the utility model, power saving, save worry, timesaving new electrically heating lunch box.

Embodiment:

Make the inner dischargeable capacity 1200ML of the following L * B of a kind of lunch box overall dimensions * H:200 * 140 * 80MM of utility model according to the frame mode of accompanying drawing 1.ZHP Electric radiant Heating Film size 80 * 50MM, power 200W is heated to 80 ℃ with food, needs about 15 minutes approximately.

The electronic automatic control circuit parameter is as follows:

Electric capacity: C1=0.47u/400V, C2=220u/16V, C3=1u/16V, C4=0.47u+0.33u, C5=0.01u, C6=68u, C7=0.01u.

Resistance: R1=1M, R2=4.7M, R3=1M, R5, R10, R6=4.7K, R7=5.1K, R8=1M, W1=1M, W2=2M.

Diode: D1=0.2A/400V, D2=2CW60, D3=0.1A/50V, D4, D5: light emitting diode.

BG1=3DG12, BG2=SCR3A/600V, IC1=CD4060, IC2=7555, K1=4 shelves band switch.

It is as follows that this controls the circuit engineering parameter certainly:

The longest timing: 8 hours, divided fourth gear 0,1～2 hours, 2～4 hours, 4～8 hours, wherein 1～2,2～4, adjustable continuously in 4～8 fixed time intervals, heat time heating time can selection arbitrarily in 10 to 30 minutes by adjusting W2.

Temperature control condenser J selects hermetically sealed closed type for use, 110 ℃ of operating temperatures.Overtemperature safety fuse model RF130-5,130 ℃ of molten disconnected temperature.Electronics is controlled plug (9) automatically and is of a size of 80 * 60 * 30MM.

Claims

1, a kind of automatic electric heating lunch box, it comprises:

Shell (1), inner casing (3), heat-insulation layer between shell and inner casing (2) is at inner shell bottom bonding ZHP Electric radiant Heating Film (5), thermostat relay (4), and overheated safety fuse (8), heat insulation asbestos cloth (6), lid (7);

Of the present utility model being characterised in that is provided with electronics and controls plug (9) automatically in the side of lunch box, it is made up of adjustable long-time timer (10) and controller heat time heating time (11).

2, automatic electric heating lunch box according to claim 1, it is characterized in that, adjustable long-time timer (10) is 14 grades of frequency divider ICs 1 that have oscillator, reach the resistance R 3 that is connected to the decision frequency of oscillation at pin [9] [10], W1 and capacitor C 4, and be connected to the triode phase inverter at output and form.

3, automatic electric heating lunch box according to claim 1 is characterized in that forming monostable circuit with a time-base integrated circuit IC2, and the output and the bidirectional triode thyristor BG2 control utmost point join, by adjusting the ON time that external potentiometer W2 decides controllable silicon BG2.

4, electric heating mess tin according to claim 1 is characterized in that whole electronic automatic control circuits are contained in a plug box (9) lining.