CN201337333Y - Electric rice cooker and control circuit - Google Patents

Electric rice cooker and control circuit Download PDF

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Publication number
CN201337333Y
CN201337333Y CNU2009200038624U CN200920003862U CN201337333Y CN 201337333 Y CN201337333 Y CN 201337333Y CN U2009200038624 U CNU2009200038624 U CN U2009200038624U CN 200920003862 U CN200920003862 U CN 200920003862U CN 201337333 Y CN201337333 Y CN 201337333Y
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CN
China
Prior art keywords
electric cooker
control circuit
switch
cooking
thermostat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CNU2009200038624U
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Chinese (zh)
Inventor
张娇杰
杨勇
肖正涛
徐明燕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
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Priority to CNU2009200038624U priority Critical patent/CN201337333Y/en
Application granted granted Critical
Publication of CN201337333Y publication Critical patent/CN201337333Y/en
Anticipated expiration legal-status Critical
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Abstract

The utility model provides a control circuit used for an electric rice cooker, which comprises a serial power supply, a heating unit, a control switch unit which controls the heating unit and a temperature control unit, wherein the control switch unit comprises a cover-closing light touch switch which is disconnected /closed according to the open/the close of a cover of the electric rice cooker, a weight sensing switch which is disconnected/closed according to the total weight of an inner pan of the electric rice cooker and food in the inner pan, wherein the cover-closing light touch switch is connected with the weight sensing switch in series. The utility model further provides the electric rice cooker with the control circuit, the electric rice cooker and the control circuit solve the problem of an electric rice cooker of the prior art that the electric rice cooker can be started to enter a cooking state only through pressing down a cooking switch by the external force, which is inconvenient to users during the use process, the electric rice cooker eliminates the process of pressing down the cooking switch, and the use is simpler and more convenient.

Description

Electric cooker and control circuit thereof
Technical field
The utility model relates to household appliance technical field, in particular to a kind of electric cooker and control circuit thereof.
Background technology
Electric cooker in the market mainly adopts microelectric technique and two kinds of control modes of mechanical type, and wherein, nearly all mechanical type electric cooker all uses magnetic steel temperature limiter to realize the function of cooking.
The magnetic steel temperature limiter electric cooker of prior art mainly by the cooperation of magnetic steel temperature limiter, bimetal temperature control device, comes the break-make of control circuit, thereby controls the whole process of cooking.Fig. 1 shows the circuit diagram according to the magnetic steel temperature limiter electric cooker of prior art.
The operation principle of the magnetic steel temperature limiter electric cooker of prior art is: under the normal condition, bimetal temperature control device 101 is normally closed, and magnetic steel temperature limiter 102 is often opened, by pressing the switch of cooking with magnetic steel temperature limiter 102 closures.
When connecting power supply (normally 220V alternating voltage) but do not press when cooking switch, bimetal temperature control device 101 closures, magnetic steel temperature limiter 102 disconnect, and electric hot tray 103 (being generally 100 ohm) begins heating, and the indicator lamp 105 of cooking is bright; But when temperature reached the operating temperature of bimetal temperature control device 101, bimetal temperature control device 101 disconnected, and insulation indicator lamp 104 is bright; When temperature drops to the recovery temperature of bimetal temperature control device 101, bimetal temperature control device 101 conducting again.So repeatedly, electric cooker is in keeping warm mode always, and the Mi Wufa in the highest operating temperature (being generally about 80 ℃) that can only reach bimetal temperature control device 101 of electric cooker temperature, electric cooker boils.
When pressing when cooking switch, magnetic steel temperature limiter 102 closures, this moment magnetic steel temperature limiter 102 and bimetal temperature control device 101 equal conductings, this moment, circuit formed the circuit of cooking, the loop of conducting comprises parallel branch and the temperature insurance device 108 that power supply 220V, the electric hot tray 103 of series connection and the indicator lamp 105 of cooking, resistance 106 (220K~330K ohm) are formed in this circuit, electric hot tray 103 heatings, the indicator lamp 105 of cooking is bright; When temperature rose to the operating temperature of bimetal temperature control device 101, bimetal temperature control device 101 disconnected still conducting of magnetic steel temperature limiter 102, electric hot tray 103 persistent fevers; After rice is cooked, temperature rises to the operating temperature (being generally about 150 ℃) of magnetic steel temperature limiter 102 rapidly, magnetic steel temperature limiter 102 disconnects, this moment, magnetic steel temperature limiter 102 and bimetal temperature control device 101 circuits all disconnected, this moment, circuit formed the insulation circuit, the loop of conducting comprises power supply, insulation indicator lamp 104 and resistance 107 (220K~330K ohm), electric hot tray 103 and the indicator lamp 105 of cooking of series connection, parallel branch and the temperature insurance device 108 that resistance 106 is formed in this circuit, electric cooker enters keeping warm mode, and insulation indicator lamp 104 is bright.Because the resistance value of the resistance 107 of connecting with insulation indicator lamp 104 is much larger than the resistance value of electric hot tray 103 with the parallel branch of the indicator lamp 105 of cooking, resistance 106 compositions, insulation indicator lamp 104 is bright, and because the voltage at indicator lamp 105 two ends of cooking is very little, electric current can't reach the luminous minimum current of the indicator lamp of cooking on it, and the indicator lamp 105 of cooking does not work.
In realizing the utility model process, the inventor finds that there are the following problems at least in the prior art: because the electric cooker of prior art need could start electric cooker and enters the state of cooking by pressing the switch of cooking, thereby cause user's inconvenience in use, for example forget and press the switch of cooking that the rice in the electric cooker can not boil.
The utility model content
The utility model aims to provide a kind of electric cooker and control circuit thereof, and the electric cooker that can solve prior art need be pressed the switch of cooking by external force and could start electric cooker and enter the state of cooking, thereby causes the problem of user's inconvenience in use.
In embodiment of the present utility model, a kind of control circuit that is used for electric cooker is provided, comprise: the gauge tap unit and the temperature control unit of the power supply of series connection, heating unit and control heating unit, the gauge tap unit comprises: according to the opening/closing of lid of electric cooker and touch-switch is covered in closing of cut-off/close, and according to the gross weight of the interior pot of electric cooker and content thereof and the weight induction switch of cut-off/close; Close and cover touch-switch and the series connection of weight induction switch.
Preferably, in above-mentioned control circuit, close and cover the He Gaichu that touch-switch is positioned at electric cooker.
Preferably, in above-mentioned control circuit, the weight induction switch is a pressure detector, and is positioned at the bottom of the outer pot of electric cooker.
Preferably, in above-mentioned control circuit, the temperature control unit comprises: first thermostat and second thermostat in parallel.
Preferably, in above-mentioned control circuit, first thermostat and second thermostat are respectively magnet steel thermostat and bimetal temperature control device, and all are normally closed renewable type thermostat.
Preferably, in above-mentioned control circuit, also comprise the indicator unit of the duty that is used to indicate electric cooker, indicator unit comprises: insulation indicator lamp branch road, it is in parallel with the temperature control unit, and insulation indicator lamp branch road comprises the insulation indicator lamp and first current-limiting resistance of series connection; And the indicator lamp branch road of cooking, it is in parallel with heating unit, and the indicator lamp branch road of cooking comprises the cook indicator lamp and second current-limiting resistance of series connection.
Preferably, in above-mentioned control circuit, the resistance value of first current-limiting resistance and second current-limiting resistance is 180K~330K ohm.
Preferably, in above-mentioned control circuit, heating unit is the electric hot tray of electric cooker.
Preferably, in above-mentioned control circuit, also comprise: be connected on the temperature insurance device in the control circuit.
In embodiment of the present utility model, a kind of electric cooker also is provided, have the control circuit of above preferred embodiment.
Because conducting or the disconnection of adopting gauge tap unit and temperature control unit to come control circuit, thereby the duty of control electric cooker, the electric cooker that has solved prior art need be pressed the switch of cooking by external force and could start electric cooker and enter the state of cooking, thereby cause the problem of user's inconvenience in use, thereby saved the step of pressing the switch of cooking, used simple more, convenient.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 shows the circuit diagram according to the magnetic steel temperature limiter electric cooker of prior art;
Fig. 2 shows the circuit diagram according to the electric cooker of the utility model embodiment;
Fig. 3 shows the circuit diagram according to the electric cooker of the utility model preferred embodiment.
The specific embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
Fig. 2 shows the circuit diagram according to the electric cooker of the utility model embodiment, and Fig. 3 shows the circuit diagram according to the electric cooker of the utility model preferred embodiment.As shown in Figures 2 and 3, control circuit comprises: the gauge tap unit 30 and the temperature control unit 40 of the power supply 10 of series connection, heating unit 20 and control heating unit 20, gauge tap unit 30 comprises: according to the opening/closing of lid of electric cooker and touch-switch 301 is covered in closing of cut-off/close, and according to the gross weight of the interior pot of electric cooker and content thereof and the weight induction switch 302 of cut-off/close; Close and cover touch-switch 301 and 302 series connection of weight induction switch.
The preferred embodiment is because conducting or the disconnection of adopting gauge tap unit and temperature control unit to come control circuit, thereby the duty of control electric cooker, the electric cooker that has solved prior art need be pressed the switch of cooking by external force and could start electric cooker and enter the state of cooking, thereby cause the problem of user's inconvenience in use, thereby saved the step of pressing the switch of cooking, used simple more, convenient.
Whether the present embodiment utilization is closed and is covered touch-switch and weight induction switch and close by the lid that detects electric cooker respectively, and the interior pot of electric cooker and the gross weight of content thereof, control the conducting/disconnection of main circuit, when connecting power supply, cover lid, and the interior pot of electric cooker and the gross weight of content thereof are increased to the required minimum weight of weight induction switch closure (being the minimal closure weight of weight induction switch) when above, circuit enters the state of cooking, electric cooker can begin to cook, thereby has avoided forgetting the problem that the rice of cooking switch and occurring does not boil of pressing; And close the break-make of covering touch-switch and weight induction switch control entire circuit, when lid is not built or electric cooker weight when not reaching the minimal closure weight of weight induction switch, whole electric cooker control circuit can conducting, safety, no standby energy consumption.
Preferably, close and cover the He Gaichu that touch-switch 301 is positioned at electric cooker, weight induction switch 302 is a pressure detector, and is positioned at the bottom of the outer pot of electric cooker.Like this, add to close and cover touch-switch, be connected in series in the main circuit of electric cooker, close and cover the power closure that touch-switch closes by lid by close the place of lid at electric cooker, open when lid upspring when active force disappears, switch disconnects.At the electric cooker bottom position weight induction switch is set, when institute's sense weight switch closure during greater than minimal closure weight, less than the time disconnect.Minimal closure weight that can the weight induction switch is set to the weight sum of the empty pot body weight of inner pan of electric cooker, one glass of rice and a scale water.
It should be noted that herein the weight induction switch is arranged on electric cooker bottom but not interior pot bottom that the pressure that produces in the time of can avoiding because of closed electric cooker lid causes the closed problem of weight induction switch mistake.
Preferably, as shown in Figure 3, temperature control unit 40 comprises: first thermostat 401 and second thermostat 402 in parallel.Wherein, first thermostat 401 and second thermostat 402 are respectively magnet steel thermostat and bimetal temperature control device, and all are normally closed renewable type thermostat.Like this, can pass through the variation of first thermostat and second thermostat, control the duty of electric cooker automatically according to the heating-up temperature of electric cooker.The renewable type thermostat has operating temperature and recovery temperature, and the recovery temperature of first thermostat is less than the recovery temperature of second thermostat.
The preferred embodiment is covered touch-switch and the weight induction switch button that replaces cooking and is triggered the magnet steel thermostat by closing, thereby the control circuit of control electric cooker enters the state of cooking, on the structure of electric cooker, save relevant parts such as the switch of cooking, reduced cost; And avoided because of frequently pressing the failure problems of the leverage that the switch of cooking causes.
The temperature of pot bottom in the temperature that first thermostat and second thermostat detect is required to be, because people when using electric cooker, generally use pot (generally can scald one's hand) in the direct contact of hand when temperature is higher than 50 ℃, and the temperature of interior pot descends very fast when not heating.The temperature of pot in thermostat directly detects, hot pan boiling meal at last just, the temperature of interior pot can satisfy the requirement of hot pan boiling meal through reducing to below 50 ℃ after the cold wash at once.
Preferably, as shown in Figures 2 and 3, in above-mentioned control circuit, the indicator unit 50 that also comprises the duty that is used to indicate electric cooker, indicator unit 50 comprises: insulation indicator lamp branch road 501, it is in parallel with temperature control unit 40, and insulation indicator lamp branch road 501 comprises the insulation indicator lamp 5011 and first current-limiting resistance 5012 of series connection; And the indicator lamp branch road 502 of cooking, it is in parallel with heating unit 20, and the indicator lamp branch road 502 of cooking comprises the cook indicator lamp 5021 and second current-limiting resistance 5022 of series connection.
The preferred embodiment is come duty to the user prompt electric cooker by indicator unit is set, and makes the user to use electric cooker more easily, makes the use hommization more of electric cooker.
Wherein, the resistance value of first current-limiting resistance 5012 and second current-limiting resistance 5022 is 180K~330K ohm.Preferably, heating unit 20 is the electric hot tray of electric cooker.The resistance value of electric hot tray is generally 100 ohm.As can be seen, the resistance value of first current-limiting resistance and second current-limiting resistance is much larger than the resistance value of electric hot tray, thereby when first thermostat and the equal closure of second thermostat, insulation indicator lamp branch, short-circuit, 220V voltage apply pressure to by electric hot tray and the parallel branch that the indicator lamp branch road forms of cooking on, the voltage at indicator lamp branch road two ends of cooking this moment is very big, and the electric current on it is greater than the luminous minimum current of the indicator lamp of cooking, and the indicator lamp of cooking is bright; When first thermostat and second thermostat all disconnect, because the resistance value of first current-limiting resistance on the insulation indicator lamp branch road is much larger than the resistance value of the parallel branch of the electric hot tray and the indicator lamp branch road composition of cooking, the insulation indicator lamp is bright, and because the voltage at the indicator lamp branch road two ends of cooking is very little, electric current can't reach the luminous minimum current of the indicator lamp of cooking on it, and the indicator lamp of cooking does not work.
Preferably, in above-mentioned control circuit, also comprise: be connected on the temperature insurance device 60 in the control circuit.Like this, can play the effect of protection entire circuit by temperature insurance device 60.
In embodiment of the present utility model, a kind of electric cooker also is provided, it has control circuit as shown in Figures 2 and 3.
According to the control circuit of preferred embodiment shown in Figure 3, with the mechanical type electric cooker, and the operating temperature of second thermostat is that 80 ℃ of (being higher than 80 ℃ of disconnections), recovery temperatures are 60 ℃ (being lower than 60 ℃ of closures); The recovery temperature of first thermostat is 50 ℃ (being lower than 50 ℃ of closures), and operating temperature is the temperature (be generally about 150 ℃, be higher than 150 ℃ disconnections) of rice when boiling illustrates this control circuit for example a operation principle:
When the lid of power connection, electric cooker covers, when weight induction switch 302 detects the weight of pot bodies 〉=minimal closure weight, close and cover touch-switch 301 closures, weight induction switch 302 closures.Cause first thermostat 401 and second thermostat 402 are normally closed renewable type switches, and the circuit of cooking this moment promptly is path (being in the state of cooking), thus the interior pot of electric hot tray 20 heating heating electric rice cookers; 501 short circuits of insulation indicator lamp branch road, no current passes through on it, insulation indicator lamp 5011 is not luminous, 220V voltage applies pressure on the parallel branch of being made up of the electric hot tray 20 and the indicator lamp branch road 502 of cooking, the voltage at indicator lamp branch road 502 two ends of cooking this moment is very big, electric current on it is greater than the luminous minimum current of the indicator lamp 5021 of cooking, and the indicator lamp 5021 of cooking is bright, begins to cook.When temperature was increased to 80 ℃ of its operating temperatures, second thermostat 402 disconnected, and continued to and all keep off-state before temperature is reduced to 60 ℃, and at this moment, because first thermostat 401 is still closed, electric hot tray 20 continues pot in the heating heating, and the rice in pot boils.
After rice boils, temperature rises rapidly, when 150 ℃ of operating temperatures that is higher than first thermostat 401, first thermostat 401 disconnects, this moment, second thermostat 402 also was in off-state, because the resistance value (220K~330K ohm) of first current-limiting resistance 5012 on the insulation indicator lamp branch road 501 is much larger than the resistance value of the parallel branch of the electric hot tray 20 and indicator lamp branch road 502 compositions of cooking, insulation indicator lamp 5011 is bright, and because the voltage at indicator lamp branch road 502 two ends of cooking is very little, electric current can't reach the luminous minimum current of the indicator lamp 5021 of cooking on it, the indicator lamp 5021 of cooking goes out, the circuit of cooking disconnects, thermal circuit is a path, and electric cooker enters keeping warm mode.
When the temperature of inner pan of electric cooker bottom is reduced to 60 ℃ of the recovery temperatures of second thermostat 402, second thermostat 402 is closed once more, this moment, first thermostat 401 was in off-state, pot in the electric hot tray 20 heating heating, when temperature rises to 80 ℃ of the operating temperatures of second thermostat 402, second thermostat 402 disconnects once more, keeps keeping warm mode so repeatedly.When the temperature of inner pan of electric cooker bottom was reduced to 50 ℃ of the recovery temperatures of first thermostat 401, first thermostat 401 was closed once more, and so cooking and insulating process of electric cooker finished in circulation.
When the lid of electric cooker is opened or is cut off the electricity supply or the gross weight of the interior pot of electric cooker and content thereof when being lower than the minimal closure weight of weight induction switch, when promptly above three's condition has one to satisfy, the disconnection of the main line of the control circuit of electric cooker.
In should preferably implementing, because when power supply access failure, lid do not cover or electric cooker weight when not reaching the minimal closure weight of weight induction switch, close cover touch-switch or weight induction switch just can be closed, thereby make the control circuit of electric cooker not have standby energy consumption, can reach the effect of energy-saving safe.
From above description, as can be seen, the utility model the above embodiments have realized following technique effect: because conducting or the disconnection of adopting gauge tap unit and temperature control unit to come control circuit, thereby the duty of control electric cooker, the electric cooker that has solved prior art need be pressed the switch of cooking by external force and could start electric cooker and enter the state of cooking, thereby cause the problem of user's inconvenience in use, thereby saved the step of pressing the switch of cooking, used simple more, convenient.
In addition, because when power supply access failure, lid do not cover or electric cooker weight when not reaching the minimal closure weight of weight induction switch, close cover touch-switch or weight induction switch just can be closed, thereby make the control circuit of electric cooker not have standby energy consumption, can reach the effect of energy-saving safe.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims (10)

1. a control circuit that is used for electric cooker is characterized in that, comprising: the power supply of series connection, heating unit and gauge tap unit and the temperature control unit of controlling described heating unit, and described gauge tap unit comprises:
According to the opening/closing of lid of described electric cooker and touch-switch is covered in closing of cut-off/close, and according to the gross weight of the interior pot of described electric cooker and content thereof and the weight induction switch of cut-off/close;
Described closing covered touch-switch and the series connection of described weight induction switch.
2. the control circuit that is used for electric cooker according to claim 1 is characterized in that, described closing covered the He Gaichu that touch-switch is positioned at described electric cooker.
3. the control circuit that is used for electric cooker according to claim 1 is characterized in that, described weight induction switch is a pressure detector, and is positioned at the bottom of the outer pot of described electric cooker.
4. the control circuit that is used for electric cooker according to claim 1 is characterized in that, described temperature control unit comprises: first thermostat and second thermostat in parallel.
5. the control circuit that is used for electric cooker according to claim 4 is characterized in that, described first thermostat and second thermostat are respectively magnet steel thermostat and bimetal temperature control device, and all is normally closed renewable type thermostat.
6. the control circuit that is used for electric cooker according to claim 1 is characterized in that, also comprises the indicator unit of the duty that is used to indicate described electric cooker, and described indicator unit comprises:
Insulation indicator lamp branch road, it is in parallel with described temperature control unit, and described insulation indicator lamp branch road comprises the insulation indicator lamp and first current-limiting resistance of series connection; And
The indicator lamp branch road of cooking, it is in parallel with described heating unit, and the described indicator lamp branch road of cooking comprises the cook indicator lamp and second current-limiting resistance of series connection.
7. the control circuit that is used for electric cooker according to claim 6 is characterized in that, the resistance value of described first current-limiting resistance and described second current-limiting resistance is 180K~330K ohm.
8. the control circuit that is used for electric cooker according to claim 1 is characterized in that, described heating unit is the electric hot tray of described electric cooker.
9. the control circuit that is used for electric cooker according to claim 1 is characterized in that, also comprises: be connected on the temperature insurance device in the described control circuit.
10. an electric cooker is characterized in that, has according to each described control circuit in the claim 1 to 9.
CNU2009200038624U 2009-02-12 2009-02-12 Electric rice cooker and control circuit Expired - Lifetime CN201337333Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2009200038624U CN201337333Y (en) 2009-02-12 2009-02-12 Electric rice cooker and control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2009200038624U CN201337333Y (en) 2009-02-12 2009-02-12 Electric rice cooker and control circuit

Publications (1)

Publication Number Publication Date
CN201337333Y true CN201337333Y (en) 2009-11-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNU2009200038624U Expired - Lifetime CN201337333Y (en) 2009-02-12 2009-02-12 Electric rice cooker and control circuit

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104146594A (en) * 2014-08-27 2014-11-19 赖业文 Dual-purpose electric cooker heating device
CN105193244A (en) * 2014-05-29 2015-12-30 佛山市顺德区美的电热电器制造有限公司 Pressure cooking utensil
CN105326332A (en) * 2015-11-19 2016-02-17 珠海格力电器股份有限公司 Electric heating pan with inner pot detecting device and inner pot detecting method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105193244A (en) * 2014-05-29 2015-12-30 佛山市顺德区美的电热电器制造有限公司 Pressure cooking utensil
CN105193244B (en) * 2014-05-29 2017-10-27 佛山市顺德区美的电热电器制造有限公司 Pressure cooking appliance
CN104146594A (en) * 2014-08-27 2014-11-19 赖业文 Dual-purpose electric cooker heating device
CN105326332A (en) * 2015-11-19 2016-02-17 珠海格力电器股份有限公司 Electric heating pan with inner pot detecting device and inner pot detecting method

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Granted publication date: 20091104

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