Summary of the invention
In view of this, the object of the present invention is to provide a kind of heat-preservation hampers, on the one hand to food by way of vacuum heat-insulationObject is kept the temperature, and on the other hand, carries out heating and thermal insulation to the food in hamper using electrically heated mode, and can be in foodThe temperature inversion for releasing food under high-temperature condition is electric energy and stores into battery, so as to effectively extendTo the soaking time of food.
A kind of heat-preservation hamper provided by the invention, including hamper ontology and box cover, the hamper ontology by including except interiorInternal layer, middle layer and outer shell have vacuum chamber, are provided between the middle layer and outer layer between the internal layer and middle layerCooling chamber, the cooling chamber is interior to be filled with cooling medium；
It further include preservation and controlling unit, the preservation and controlling unit includes thermoelectric generation film, lithium battery, heater strip, chargingAdjustment circuit and heating control circuit；
The temperature end of the thermoelectric generation film is set to the lateral wall of internal layer and is bonded with the lateral wall of internal layer, the temperature differenceThe low-temperature end of power generation sheet is set in cooling chamber, and the heater strip is set to the lateral wall of internal layer and pastes with the lateral wall of internal layerIt closes；
The output end of the thermoelectric generation film and the input terminal of charge adjustment circuit connect, the charge adjustment circuit it is defeatedThe connection of the charging end of outlet and lithium battery, the discharge end of the battery and the input terminal of heating control circuit connect, described to addThe output end of thermal control circuit is connect with heater strip；
The charge adjustment circuit includes diode D1, diode D2, capacitor C1, capacitor C2, capacitor C3, capacitor C4, electricityHinder R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, triode Q1, triodeQ2, metal-oxide-semiconductor Q3, triode Q4, voltage-stabiliser tube DW1, voltage-stabiliser tube DW2, adjustable resistance RT1 and thermistor PTC；
The anode of the diode D1 is connected as the input terminal of charge adjustment circuit and the output end of thermoelectric generation film, and twoThe cathode of pole pipe D1 is grounded by capacitor C1, and the cathode of diode D1 is connect with the collector of triode Q1, the collection of triode Q1Electrode is connect by resistance R1 with base stage, and the base stage of triode Q1 is connect with the cathode of voltage-stabiliser tube DW1, the anode of voltage-stabiliser tube DW1The emitter of ground connection, the triode Q1 is connect by resistance R2 with the collector of triode Q3, and the emitter of triode Q3 connectsIt is connected to the base stage of triode Q1, the emitter of triode Q1 after resistance R3 and resistance R4 series connection by being grounded, the base of triode Q3Pole is connected to the points of common connection between resistance R3 and resistance R4；
The anode of diode D2 is connected to the emitter of triode Q1, and the cathode of diode D2 is connected to by resistance R8The drain electrode of metal-oxide-semiconductor Q3, one end of thermistor PTC are connected to the discharge end of lithium battery, the other end of thermistor PTC with it is adjustableOne end of resistance RT1 connects, and the other end of adjustable resistance RT1 is grounded by resistance R5, between adjustable resistance RT1 and resistance R5Points of common connection is connect with the base stage of triode Q4, and the base stage of triode Q4 is grounded by capacitor C2, the collector of triode Q4It is connected to the cathode of diode D2, the emitter of triode Q4 is connected to the grid of metal-oxide-semiconductor Q3, and the grid of metal-oxide-semiconductor Q3 passes through electricityHold C3 ground connection, the grid of metal-oxide-semiconductor Q3 is connected to the collector of triode Q4 by resistance R9, and the source electrode of metal-oxide-semiconductor Q3 passes through capacitorC4 ground connection, the source electrode of metal-oxide-semiconductor Q3 are connect with the cathode of voltage-stabiliser tube DW2, the plus earth of voltage-stabiliser tube DW2, the cathode of voltage-stabiliser tube DW2Output end vo of the points of common connection as charge adjustment circuit between the source electrode of metal-oxide-semiconductor Q3；
The cathode of diode D2 is connect with the emitter of triode Q2, and the collector of triode Q2 is connected to metal-oxide-semiconductor Q3'sPoints of common connection between source electrode and capacitor C4, the base stage of triode Q2 are connected to the cathode of diode D2 by resistance R6, and threeThe base stage of pole pipe Q2 is connected to the points of common connection between the source electrode of metal-oxide-semiconductor Q3 and capacitor C4 by resistance R7；
Wherein, triode Q2 is p-type triode, and metal-oxide-semiconductor Q3 is p-type metal-oxide-semiconductor.
Further, the heating control circuit include manual switch S1, adjustable resistance RT2, thermistor NTC, amplifier U2,Controllable source of stable pressure U1, triode Q5, adjustable resistance RT3, resistance R10, resistance R11, resistance R13 and resistance R12；
One end of switch S1 and the discharge end of lithium battery connect, and the other end of switch S1 and one end of adjustable resistance RT2 connectIt connects, the other end of adjustable resistance RT2 is grounded by thermistor NTC, public between adjustable resistance RT2 and thermistor NTCTie point is connected to the reverse side of amplifier U2 by resistance R10；The in-phase end of amplifier U2 is connect with one end of resistance R11, resistanceOne end of R11 is connect with the cathode of controllable source of stable pressure U1, the plus earth of controllable source of stable pressure U1；
One end of adjustable resistance RT3 and the discharge end of battery connect, and adjustable resistance RT3 is grounded by resistance R13, adjustablePoints of common connection between resistance RT3 and resistance R13 is connect with the control electrode of controllable source of stable pressure U1, and the output end of amplifier U2 passes throughResistance R13 is connect with the base stage of triode Q5, and the emitter of triode Q5 is connect with heater strip, and the collector of triode Q5 passes throughResistance R12 is connected to the points of common connection between switch S1 and adjustable resistance RT2；Wherein, controllable source of stable pressure is TL431 pressure stabilizingSource；The thermistor NTC is set on the inside of internal layer.
Further, the outer shell bottom outside wall invaginates to form accommodating chamber, the lithium battery, charge adjustment circuit and addThermal control circuit is set in accommodating chamber；
The opening of the accommodating chamber is provided with seal cover board.
Further, it is provided with heat-reflecting layer on the inside of the internal layer inner sidewall and box cover, the heat-reflecting layer, which corresponds to, to be addedIt is arranged at heated filament and thermoelectric generation film jagged.
It further, further include USB charging structure, the output end of the USB charging structure and the charging end of lithium battery connect.
Beneficial effects of the present invention: through the invention, on the one hand food is kept the temperature by way of vacuum heat-insulation, separatelyOn the one hand, heating and thermal insulation is carried out to the food in hamper using electrically heated mode, and high-temperature condition can be in foodThe lower temperature inversion for releasing food is electric energy and stores into battery, so as to effectively extend the heat preservation to foodTime.
Specific embodiment
Further description is made to the present invention below in conjunction with Figure of description, as shown in the figure:
A kind of heat-preservation hamper provided by the invention, including hamper ontology 8 and box cover 1, the hamper ontology is by interior outsourcingInclude internal layer 9, middle layer 10 and outer shell 11, there is vacuum chamber 2 between the internal layer and middle layer, the middle layer and outer layer itBetween be provided with cooling chamber 3, be filled with cooling medium in the cooling chamber 3；
It further include preservation and controlling unit, the preservation and controlling unit includes thermoelectric generation film 6, lithium battery, heater strip 7, fillsElectric adjustment circuit and heating control circuit；
The temperature end of the thermoelectric generation film is set to the lateral wall of internal layer and is bonded with the lateral wall of internal layer, the temperature differenceThe low-temperature end of power generation sheet is set in cooling chamber, and the heater strip is set to the lateral wall of internal layer and pastes with the lateral wall of internal layerIt closes；
The output end of the thermoelectric generation film and the input terminal of charge adjustment circuit connect, the charge adjustment circuit it is defeatedThe connection of the charging end of outlet and lithium battery, the discharge end of the battery and the input terminal of heating control circuit connect, described to addThe output end of thermal control circuit is connect with heater strip；
The charge adjustment circuit includes diode D1, diode D2, capacitor C1, capacitor C2, capacitor C3, capacitor C4, electricityHinder R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, triode Q1, triodeQ2, metal-oxide-semiconductor Q3, triode Q4, voltage-stabiliser tube DW1, voltage-stabiliser tube DW2, adjustable resistance RT1 and thermistor PTC；
The anode of the diode D1 is connected as the input terminal of charge adjustment circuit and the output end of thermoelectric generation film, and twoThe cathode of pole pipe D1 is grounded by capacitor C1, and the cathode of diode D1 is connect with the collector of triode Q1, the collection of triode Q1Electrode is connect by resistance R1 with base stage, and the base stage of triode Q1 is connect with the cathode of voltage-stabiliser tube DW1, the anode of voltage-stabiliser tube DW1The emitter of ground connection, the triode Q1 is connect by resistance R2 with the collector of triode Q3, and the emitter of triode Q3 connectsIt is connected to the base stage of triode Q1, the emitter of triode Q1 after resistance R3 and resistance R4 series connection by being grounded, the base of triode Q3Pole is connected to the points of common connection between resistance R3 and resistance R4；
The anode of diode D2 is connected to the emitter of triode Q1, and the cathode of diode D2 is connected to by resistance R8The drain electrode of metal-oxide-semiconductor Q3, one end of thermistor PTC are connected to the discharge end of lithium battery, the other end of thermistor PTC with it is adjustableOne end of resistance RT1 connects, and the other end of adjustable resistance RT1 is grounded by resistance R5, between adjustable resistance RT1 and resistance R5Points of common connection is connect with the base stage of triode Q4, and the base stage of triode Q4 is grounded by capacitor C2, the collector of triode Q4It is connected to the cathode of diode D2, the emitter of triode Q4 is connected to the grid of metal-oxide-semiconductor Q3, and the grid of metal-oxide-semiconductor Q3 passes through electricityHold C3 ground connection, the grid of metal-oxide-semiconductor Q3 is connected to the collector of triode Q4 by resistance R9, and the source electrode of metal-oxide-semiconductor Q3 passes through capacitorC4 ground connection, the source electrode of metal-oxide-semiconductor Q3 are connect with the cathode of voltage-stabiliser tube DW2, the plus earth of voltage-stabiliser tube DW2, the cathode of voltage-stabiliser tube DW2Output end vo of the points of common connection as charge adjustment circuit between the source electrode of metal-oxide-semiconductor Q3；
The cathode of diode D2 is connect with the emitter of triode Q2, and the collector of triode Q2 is connected to metal-oxide-semiconductor Q3'sPoints of common connection between source electrode and capacitor C4, the base stage of triode Q2 are connected to the cathode of diode D2 by resistance R6, and threeThe base stage of pole pipe Q2 is connected to the points of common connection between the source electrode of metal-oxide-semiconductor Q3 and capacitor C4 by resistance R7；
Wherein, triode Q2 is p-type triode, and metal-oxide-semiconductor Q3 is p-type metal-oxide-semiconductor；Wherein, lithium battery is had using existingThe lithium battery of charge and discharge control chip, belongs to the prior art, and not in this to go forth；When thermoelectric generation film exports electric current, lead toThe negative-feedback voltage regulator circuit for crossing the elements such as triode Q1 and triode Q3, voltage-stabiliser tube DW1 composition carries out steady pressure treatment, to guaranteeSubsequent conditioning circuit can obtain the direct current of voltage stabilization；After electric current flows through diode D2, the emitter voltage of triode Q2 is greater thanBase voltage and be connected, to capacitor C4 charge, when capacitor C4 both end voltage be greater than metal-oxide-semiconductor Q3 grid voltage when, metal-oxide-semiconductor Q3 protectConducting is held, from providing stable charging current to lithium battery；
Thermistor PTC is posive temperature coefficient thermistor, when the temperature of food is very high, then the resistance value pole of the resistanceGreatly, at this point, the base stage of triode Q4 is almost without voltage, therefore, triode Q4 cut-off, when food temperature decline, thermistorThe resistance value of PTC also declines therewith, until triode Q3 is connected, adjusts temperature threshold by adjustable resistance RT1, that is to say, thatBy the size of adjusting RT1, triode Q4 after food temperature drops to how many degree can be set and be connected, after triode Q4 conducting,The grid voltage of metal-oxide-semiconductor Q3 increases, and the difference of the grid voltage of metal-oxide-semiconductor Q3 and source voltage is less than conduction threshold, thusSo that metal-oxide-semiconductor Q3 ends, at this point, charge adjustment circuit is then to lithium battery power supply, because of the electric current and electricity of thermo-electric generation at this timePressure is all smaller, good charging can not be formed to lithium battery, and reduce the load of thermoelectric generation film, if the temperature of foodContinue to reduce, then the electric energy of thermoelectric generation film output cannot be triode Q1 work, thus also cannot be defeated to lithium batteryCharging current out；When thermoelectric generation film during the work time, cold end can generate heat, generating efficiency be influenced, therefore, by coldBut medium cools down the cold end of thermoelectric generation film；By above structure, on the one hand to food by way of vacuum heat-insulationIt is kept the temperature, on the other hand, heating and thermal insulation is carried out to the food in hamper using electrically heated mode, and can be at foodThe temperature inversion for releasing food under high-temperature condition is electric energy and stores into battery, so as to effectively extend pairThe soaking time of food.
In the present embodiment, the heating control circuit includes manual switch S1, adjustable resistance RT2, thermistor NTC, fortunePut U2, controllable source of stable pressure U1, triode Q5, adjustable resistance RT3, resistance R10, resistance R11, resistance R13 and resistance R12；
One end of switch S1 and the discharge end of lithium battery connect, and the other end of switch S1 and one end of adjustable resistance RT2 connectIt connects, the other end of adjustable resistance RT2 is grounded by thermistor NTC, public between adjustable resistance RT2 and thermistor NTCTie point is connected to the reverse side of amplifier U2 by resistance R10；The in-phase end of amplifier U2 is connect with one end of resistance R11, resistanceOne end of R11 is connect with the cathode of controllable source of stable pressure U1, the plus earth of controllable source of stable pressure U1；
One end of adjustable resistance RT3 and the discharge end of battery connect, and adjustable resistance RT3 is grounded by resistance R13, adjustablePoints of common connection between resistance RT3 and resistance R13 is connect with the control electrode of controllable source of stable pressure U1, and the output end of amplifier U2 passes throughResistance R13 is connect with the base stage of triode Q5, and the emitter of triode Q5 is connect with heater strip, and the collector of triode Q5 passes throughResistance R12 is connected to the points of common connection between switch S1 and adjustable resistance RT2；Wherein, controllable source of stable pressure is TL431 pressure stabilizingSource；The thermistor NTC is set on the inside of internal layer；By the temperature of food in thermistor detection hamper, when temperature is lower thanWhen setting value, comparator exports high level, and triode Q5 is connected at this time, and heater strip RL obtains electric, to heat to food, leads toThe discharge path of switch S1 control lithium battery is crossed, for example user is unwilling to carry out continuing message to food, disconnects switch S1 at this time,It can achieve the goal, use for convenience, switch S1 is generally positioned on the outside of outer layer, and for convenient for washing, switch S1Using existing water proof switch.
In the present embodiment, the outer shell bottom outside wall invaginates to form accommodating chamber 4, the lithium battery, charging adjustment electricityRoad and heating control circuit are set in accommodating chamber；
The opening of the accommodating chamber is provided with seal cover board 5, by this structure, can to the equipment in accommodating chamber intoThe good protection of row.
In the present embodiment, heat-reflecting layer 12, the heat-reflecting layer pair are provided on the inside of the internal layer inner sidewall and box coverIt should be arranged at heater strip and thermoelectric generation film jagged, by this structure, the heat preservation of heat-preservation hamper can be conducive to extendTime, and the work of heater strip and thermoelectric generation film is not influenced.
It further include USB charging structure in the present embodiment, the output end of the USB charging structure and the charging end of lithium batteryConnection, although thermoelectric generation film can provide power supply for lithium battery, thermoelectric generation film is merely capable of improving the continuous of lithium batteryBoat, does not ensure that lithium battery is filled, and therefore, by above structure, convenient is that lithium battery charges.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared withGood embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the inventionArt scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at thisIn the scope of the claims of invention.