CN1188212A - Safety system for microwave oven with heater - Google Patents
Safety system for microwave oven with heater Download PDFInfo
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- CN1188212A CN1188212A CN97123052A CN97123052A CN1188212A CN 1188212 A CN1188212 A CN 1188212A CN 97123052 A CN97123052 A CN 97123052A CN 97123052 A CN97123052 A CN 97123052A CN 1188212 A CN1188212 A CN 1188212A
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- heater
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- wave oven
- security system
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Abstract
A microwave oven includes an electric heater disposed in the cooking chamber for cooking by radiant heat. A temperature sensor senses a temperature of the heater, and a door sensor senses an open state of the oven door. If the oven door is open, and the heater temperature is at or above a reference temperature (i.e., a temperature which could burn a user), an alarm, such as an audio and/or visual alarm, is activated to warn the user.
Description
The present invention relates generally to a kind of security system that is used to have the micro-wave oven of heater.Relate in particular to a kind of security system that is used to have the micro-wave oven of heater, when putting food or getting food in the cooking room of user at micro-wave oven, if the surface temperature of micro-wave oven surpasses the preset, the user will warn in this system, thereby prevents unexpected scald.
Micro-wave oven is the device for cooking of the high-frequency energy cooking food of a kind of 2450MHz of use.It provides energy to make it high-speed motion and produce frictional heat to the food molecule.This micro-wave oven also has a heater at its cooking room, and baking function is provided, by direct cooking food.
Fig. 1 is the front view of common micro-wave oven.As shown in Figure 1, traditional micro-wave oven comprises cooking room 10, and at this, food is cooked with high-frequency energy; A door 20 is used to open or close cooking room; One rotary electric machine (not shown); One connects the rotatable platform 11 of rotary electric machine; One puts the pallet 12 of food, and it is positioned on the rotatable platform 11.
Traditional micro-wave oven also comprises a heater 13, is used for roasting; One thermistor 14 detects the temperature in the cooking room 10; One control panel, display 30 and function with microwave oven operation information are selected part 40; One magnetron antenna (not shown) is installed on the limit wall on cooking room 10 tops, is used for to cooking room 10 emission high-frequency energies; One magnetron (not shown) is installed in the space at display 30 rear portions, is used for providing high-frequency energy to the magnetron antenna.
Conventional microwave oven with heater 13 still keeps high temperature in the predetermined a period of time after the cooking is finished.The temperature slowly because traditional micro-wave oven can not HEATER FOR MEASURING 13 descends, the user is imprecise to know that how much higher the temperature of heater 13 is than temperature in the micro-wave oven, like this, when the user before heater 13 cooling with traditional micro-wave oven again during cooking food, he may run into hot heater 13 when putting food or get food in cooking room 10 from cooking room 10.If his/her hand is run into heater 13, his/her hand just may have been scalded, and may leave the food of holding in the hand immediately behind, thereby makes cooking room 10 dirty.
The security system that is used for micro-wave oven of the present invention can be eliminated the shortcoming of conventional art.
An object of the present invention is to provide a security system of the micro-wave oven that is used to have heater, if the surface temperature of microwav eoven heater surpasses predetermined point, it just warns the user, scalds to prevent the user.
In order to obtain the present invention's purpose above-mentioned, a kind of security system is disclosed, be used for a micro-wave oven with following feature.Micro-wave oven has a main body; One is installed on the cooking room of main body; A door is used to open or close cooking room; One heater is positioned at the top of cooking room, is used to cook direct-fired food; With a temperature sensor, detect the internal temperature of cooking room.
The security system that is used for micro-wave oven of the present invention comprises a heater temperature sensor, is used for the surface temperature of HEATER FOR MEASURING; One door switch is used for the opening and closing of detecting gate; One control module receives from each signal of door switch and temperature sensor output, and whether the surface temperature of definite heater be higher than the predetermined reference temperature, and whether door switch is connected; With a warning device, determine the surface temperature of heater when control module and be higher than the predetermined reference temperature, and under the situation that door switch is connected when Dang Men opens, send warning to the user.
Heater temperature sensor is made up of two kinds of bimetallics with metal of different heat expansion coefficient, if temperature increases, because the thermal coefficient of expansion difference, heater temperature sensor will be crooked.Heater temperature sensor is made up of thermistor, and thermistor is a temperature sensitive resistor, if temperature increases, its resistance reduces.Heater temperature sensor output one magnitude of voltage corresponding to the heater table surface temperature, control module compares this voltage and the reference temperature correspondent voltage of presetting, and the control warning device.
Fig. 1 is the front view according to the micro-wave oven of conventional art;
Fig. 2 is the front view according to micro-wave oven of the present invention;
Fig. 3 is the circuit diagram that is used for the security system drive circuit of first preferred embodiment of the present invention;
Fig. 4 describes drive circuit control procedure shown in Figure 3;
Fig. 5 is the circuit diagram that is used for the security system drive circuit of second preferred embodiment of the present invention.
The preferred embodiments of the present invention will be described in detail in conjunction with the accompanying drawings.In whole specifications and figure, the identical identical parts of reference number representative.Thereby will be omitted its description.
Fig. 2 is the front view according to micro-wave oven of the present invention, and this micro-wave oven has a heater temperature sensor that is used for the HEATER FOR MEASURING surface temperature.Fig. 3 is the circuit diagram of drive circuit that is used for the security system of first embodiment of the invention.Fig. 4 describes drive circuit control procedure shown in Figure 3.
At first say Fig. 2, a micro-wave oven of the present invention further comprises a heater temperature sensor 15, is used to check the temperature of heater 13, and this heater temperature sensor 15 is positioned on the predetermined point at top of a cooking room 10, and this predetermined point is near heater 13.
One function selects part 40 and display 30 to be contained in the front portion of micro-wave oven, and the user can be operated and confirm easily, and function part 40 has a cooking selector switch, a barbecue mode selection switch and a power switch.
Fig. 3 is the circuit diagram of security system of the present invention, comprises heater temperature sensor 15, is used to check temperature and visual and the voice guard 50-1 and the 50-2 of heater 13.
As shown in Figure 3, security system of the present invention comprises a control module 90, and heater temperature sensor 15 is connected in series mutually with resistance R and control module, and alarm appliance 50 is by the output signal operation of control module 90.Control module 90 is according to the magnitude of voltage control alarm appliance of heater temperature sensor 15 conversions, and heater temperature sensor is checked the temperature of heater 13.The reference temperature of heater temperature sensor 15 is made as 50 ℃.The maximum that can not be scalded when the reference temperature of this heater temperature sensor 15 is made as user's contact heater 13.
As shown in Figure 3, alarm appliance 50 comprises visible alarm 50-1 and voice guard 50-2.
When the temperature of the heater of setting at heater temperature sensor 15 13 was 50 ℃, if the temperature of heater 13 surpasses 50 ℃ of reference temperatures, control module 90 just made alarm appliance 50 sounding.If the temperature of heater 13 drops to 50 ℃ or lower, control module 90 just makes alarm appliance 50 stop to report to the police.
For example, when the fixed voltage of 5V was added on 50 ℃ the heater temperature sensor, control module 90 detected values were 2.5V or littler.So control module compares added voltage with the voltage 2.5V that presets.If it determines that added voltage is lower than default voltage, it thinks that the temperature of heater 13 is higher than reference temperature so, 50 ℃, and a driving signal is added on the alarm appliance 50.
Be lower than reference temperature if the temperature of heater 13 is reduced to, then the temperature of heater temperature sensor 15 also descends.Therefore, the resistance of sensor 15 reduces according to the temperature decline of heater temperature sensor 15, and control module 90 detected voltages are 2.5V or bigger.Control module 90 compares added voltage with the voltage 2.5V that presets, if it determines that added voltage is higher than default voltage, it thinks that the temperature of heater 13 is lower than reference temperature so, and 50 ℃, and do not remove to operate alarm appliance 50.
Following description relates to the mutual operation of above-mentioned parts in the micro-wave oven.
What Fig. 4 described is drive circuit control procedure shown in Figure 3.If the user selects part 40 to select with heater 13 cookings by function, then control module 90 controls are added to the power on the heater 13, make heater 13 heatings.Display 30 is given the programming information on user's Presentation Function selection part 40.After the programme controlled cooking time finished, the power supply that is added on the heater 13 disconnected, and heater 13 is not generated heat, and notify the user to cook and finish.Ready-made food takes out from cooking room 10 then.In addition, even the cooking time of programming does not also finish, the user also can open door 20 in order to check gastronomical process or food to be taken out from cooking room 10.
If door 20 is opened, control module 90 can detect (step 100).In case control module 90 detects (step 100) door 20 and is opened, it detects the temperature of (step 200) heater 13 just every one period preset time cycle with heater temperature sensor 15.If control module 90 does not detect door 20 and is opened, it just gets back to its initial state.Control module 90 determines then whether the temperature of the heater 13 that (step 300) measures in step 200 is higher than default reference temperature (50 ℃).As mentioned above, referring to Fig. 3, control module 90 is checked when 5V voltage is added on the heater temperature sensor 15 whether detect 2.5V or lower voltage.
If control module 90 determines that the temperature of (step 300) heater 13 is higher than default reference temperature (50 ℃), it will detect voltage is 2.5V or littler, thereby connects alarm appliance 50 (step 400).More particularly, the lamp of display 30, promptly visual alarm device 50-1 connects, and audible alarm device 50-2, and promptly buzzer is connected.If the user is in order to get food or to put food and handle is put cooking room 10 into toward cooking room 10 from cooking room 10, then alarm appliance 50 allows the user know still heat of heater 13, thereby prevents that his/her hand from being scalded.On the contrary, be lower than default reference temperature (50 ℃) if control module is determined the temperature of (step 300) heater 13, it will detect voltage is 2.5V or bigger, thereby keeps alarm appliance 50 (step 500) to close, and turns back to the starting stage.
If control module 90 determines that in step 300 temperature of heater 13 is higher than default reference temperature (50 ℃), and at step 400 connection alarm appliance, turn back to the starting stage then, it can constantly check the temperature of (step 200) heater 13 in the default time cycle.Control module also compares (step 300) detected temperature and default reference temperature.If control module 90 determines that detected temperature are lower than default reference temperature, it just control be added to power supply on the alarm appliance 50, make alarm appliance quit work (step 500).Determine detected temperature when control module and be greater than or equal to default reference temperature that it just makes alarm appliance 50 work on (step 400).Closed by the user when control module 90 detects door 20, it just control be added to power supply on the alarm appliance 50, alarm appliance is quit work.
Below in conjunction with Fig. 5 an alternative embodiment of the invention is described.
The one drive circuit that is used for security system comprises a bimetallic spiral 15, and it disconnects or closing contact at given temperature spot, also comprises a door switch 70, the opening and closing of detecting gate 20, and an alarm appliance 50.
In case the temperature of the heater 13 in the cooking room is increased to preset or higher,, connect the drive circuit of security system by two kinds of laminar bimetallic spiral 15 just closed its contacts with different heat expansion coefficient.If the temperature of heater 13 drops to a predetermined point and lower, then bimetallic spiral 15 is just opened the contact, to close drive circuit.Door switch 70 is by push-botton operation, and opening and closing door 20, will switch on and off drive circuit.
Therefore, the temperature that detects heater 13 when control module 90 is increased to default temperature, and door 20 is when being opened, and it just connects drive circuit to drive alarm appliance 50.If when the temperature of heater 13 is higher than default temperature, and the user open the door 20 o'clock, control module 90 just drive alarm appliance 50 with the warning user.
As mentioned above, according to the present invention, additional temperature sensor is installed in the micro-wave oven temperature just to HEATER FOR MEASURING.When the door of micro-wave oven is opened, the temperature of heater temperature sensors HEATER FOR MEASURING.If the high degree that can be scalded to user's contact heater of the temperature of the heater that measures is then put food or when cooking room was got food, alarm appliance was just to his warning when the past cooking room of user.The present invention prevents that by this way the user from being scalded by the heater of heat.
Claims (4)
1. security system that is used to the micro-wave oven of heater, described micro-wave oven has a main body; One is installed on the cooking room of main body; A door is used to open or close cooking room; One heater is positioned at the top of cooking room, is used to cook direct-fired food; With a temperature sensor, detect the internal temperature of cooking room, this security system comprises:
The heter temperature sensing device is used for the temperature on HEATER FOR MEASURING surface;
One door switch is used for the Kai Heguan of detecting gate;
Control device receive each signal from door switch and the output of heter temperature sensing device, and whether the surface temperature of definite heater is higher than default reference temperature and whether door is being opened;
Warning device is higher than default reference temperature if control device is determined the surface temperature of heater, and under the situation that door switch is connected when Dang Men is opened to User Alarms.
2. the security system that is used to the micro-wave oven of heater as claimed in claim 1, wherein said heter temperature sensing device is made up of two kinds of bimetallics with different heat expansion coefficient metal, if temperature increases, because the thermal coefficient of expansion difference, heater temperature sensor will be crooked.
3. the security system that is used to the micro-wave oven of heater as claimed in claim 1, wherein said heter temperature sensing device is made up of thermistor, and thermistor is a temperature sensitive resistor, if temperature increases, its resistance reduces.
4. the security system that is used to the micro-wave oven of heater as claimed in claim 1, if wherein the heter temperature sensing device is exported a magnitude of voltage corresponding to the heater table surface temperature, then more described magnitude of voltage of control device and default magnitude of voltage corresponding to reference temperature, and control described warning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97123052A CN1188212A (en) | 1997-01-11 | 1997-12-01 | Safety system for microwave oven with heater |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR602/97 | 1997-01-11 | ||
| CN97123052A CN1188212A (en) | 1997-01-11 | 1997-12-01 | Safety system for microwave oven with heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1188212A true CN1188212A (en) | 1998-07-22 |
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ID=5176949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97123052A Pending CN1188212A (en) | 1997-01-11 | 1997-12-01 | Safety system for microwave oven with heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1188212A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311201C (en) * | 2002-12-18 | 2007-04-18 | Lg电子株式会社 | Safety device of electric roaster |
| CN100414175C (en) * | 2003-02-21 | 2008-08-27 | 乐金电子(天津)电器有限公司 | Process for determining and controlling opening and closing of combustion gas cooking oven door |
| CN100432542C (en) * | 2004-11-26 | 2008-11-12 | 乐金电子(天津)电器有限公司 | Cooking adjusting method for cooking utensile with heater |
| CN101658391A (en) * | 2008-08-29 | 2010-03-03 | 乐金电子(天津)电器有限公司 | Door-control device of electric oven and control method thereof |
| CN104729732A (en) * | 2013-12-19 | 2015-06-24 | 东部大宇电子株式会社 | Method and apparatus for controlling cooking device |
| CN105042649A (en) * | 2015-07-08 | 2015-11-11 | 广东美的厨房电器制造有限公司 | Microwave cooking utensil |
| CN105351983A (en) * | 2015-12-15 | 2016-02-24 | 镇江市京口润明微波器械厂 | Anti-scalding microwave oven |
-
1997
- 1997-12-01 CN CN97123052A patent/CN1188212A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311201C (en) * | 2002-12-18 | 2007-04-18 | Lg电子株式会社 | Safety device of electric roaster |
| CN100414175C (en) * | 2003-02-21 | 2008-08-27 | 乐金电子(天津)电器有限公司 | Process for determining and controlling opening and closing of combustion gas cooking oven door |
| CN100432542C (en) * | 2004-11-26 | 2008-11-12 | 乐金电子(天津)电器有限公司 | Cooking adjusting method for cooking utensile with heater |
| CN101658391A (en) * | 2008-08-29 | 2010-03-03 | 乐金电子(天津)电器有限公司 | Door-control device of electric oven and control method thereof |
| CN101658391B (en) * | 2008-08-29 | 2013-09-25 | 乐金电子(天津)电器有限公司 | Door-control device of electric oven and control method thereof |
| CN104729732A (en) * | 2013-12-19 | 2015-06-24 | 东部大宇电子株式会社 | Method and apparatus for controlling cooking device |
| CN105042649A (en) * | 2015-07-08 | 2015-11-11 | 广东美的厨房电器制造有限公司 | Microwave cooking utensil |
| CN105351983A (en) * | 2015-12-15 | 2016-02-24 | 镇江市京口润明微波器械厂 | Anti-scalding microwave oven |
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Legal Events
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| SE01 | Entry into force of request for substantive examination | ||
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |