CN1299058C - Fire detection and control method for microwave oven - Google Patents
Fire detection and control method for microwave oven Download PDFInfo
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- CN1299058C CN1299058C CNB021175055A CN02117505A CN1299058C CN 1299058 C CN1299058 C CN 1299058C CN B021175055 A CNB021175055 A CN B021175055A CN 02117505 A CN02117505 A CN 02117505A CN 1299058 C CN1299058 C CN 1299058C
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Abstract
The present invention discloses a fire detection control method for microwave ovens for preventing flame spraying outside microwave ovens when hot air in microwave ovens or fires occur under the close state of throttle valves of microwave ovens. The fire detection control method has the specific stages: under the close state of throttle valves of microwave ovens, a reference temperature is set by judging whether fires occur in the outer shell; the opening or the closing state of throttle valves of microwave ovens is controlled according to microwave cooking functions; temperature in outer shells is detected whether temperature in outer shells is higher than set reference temperature under the closing state of throttle valves of microwave ovens; when fires are detected in the stages, a power supply is immediately cut off. When fires occur, the microwave oven fire detection control method uses a temperature detecting device to cut off power supplies, and the temperature detecting device is safe and reliable and can be reliably used by customers.
Description
Technical field
The invention relates to micro-wave oven, particularly be a kind of fire detection and control method of micro-wave oven.
Background technology
With reference to the accompanying drawings, describe the method that prior art detected and controlled the micro-wave oven condition of a fire in detail.Fig. 1 is the exploded view of general micro-wave oven.As shown in the figure, micro-wave oven is made up of shell 1 and cooking room 2.Put into food in the cooking room, finish the cooking of food by microwave or baking function.One side of shell 1 has electricity storage chamber 3, and electricity storage chamber is provided with for 3 li the required electric field device of microwave takes place.Be provided with magnetron 4 in the electricity storage chamber 3.Magnetron 4 arrives cooking room with microwave transmission.3 li of electricity storage chamber also are provided with most electric field devices, as high-voltage capacitance and high-tension transformer etc. except magnetron 4.
The front of shell 1 is a front panel 5, and front panel 5 is arranged to open with cooking room 2 corresponding parts.In addition, at shell 1 sidewall, cooking room 2 and electricity storage chamber 3 separate the place, are provided with air entry 6.Air entry 6 is to the cooking room 2 inner air that suck.
Be provided with top panel 7 above the shell 1.Exhaust outlet 8 is arranged on the top panel 7, and it discharges the air of circulation in the cooking room 2.In addition, the various devices that comprise heater 9 and convection fan on the top panel 7 in addition.
In addition, porous portion 11 is arranged on the top panel 7, its objective is on the one hand the energy of heater 9 is sent to cooking room 2, reduce the leakage of microwave on the other hand as far as possible.Heater 9 is arranged in the porous portion 11 of shell 1 upper end.Heater 9 transmits advection heat and radiant heat by porous portion 11 to cooking room 2 inside, and heat food.Heater 9 is covered 12 topped by heater, cover of heater 12 has covered whole porous portion 11, also plays the effect to cooking room 2 internal reflections of the radiant heat that produces from heater 9.
Fig. 2 is the damper position perspective view.As shown in the figure, existing microwave stove has safety device air throttle 13, and purpose is to prevent from when in the stove condition of a fire taking place, to be ejected into outside the stove by air throttle 13 flames under the state that shell opens.Insurance or thermistor have been installed in air throttle 13 bottoms.
Analyze from existing micro-wave oven technology, when in the shell 1 condition of a fire taking place during the cooking,, detect and the identification fire, cut off the electricity supply thereupon by being installed in insurance or the thermistor in the shell 1.
By existing technology for detection and to control the action flow chart of the micro-wave oven condition of a fire as follows: Fig. 3 is by existing technology for detection and controls the action flow chart of the micro-wave oven condition of a fire.As shown in the figure, micro-wave oven has possessed various the 100th stages of cooking method, and the user selects needed the 110th stage of function in cooking method.In the 120th stage of state that the cooking function decision micro-wave oven air throttle of selecting 13 opens or closes, the user selects microwave cooked function, then by above-mentioned signal, begins the cooking under the state that micro-wave oven air throttle 13 leaves.
When selecting microwave cooked function, judge whether the condition of a fire takes place in the shell 1.Thermistor detects whether temperature surpasses 160 ℃ of the 130th stage in the shell 1.Temperature surpasses 160 ℃ in the shell 1 that detects, and then control part was cut off the electricity supply for the 140th stage by relay.
In sum, there is following shortcoming by present technology for detection and the method for controlling the micro-wave oven condition of a fire: when selecting microwave cooked function, whether the condition of a fire takes place, in the shell 1 temperature-detecting device has been installed in the shell 1 in order to judge.When therefore selecting convection function, can't judge whether to take place the condition of a fire.In addition, when the too high or condition of a fire takes place because of temperature in the shell 1, thermistor and insurance loss of function and initiation fire.
Summary of the invention
In order to overcome the problem that above-mentioned technology exists, detect when the invention provides a kind of micro-wave oven generation condition of a fire and the method for control fire, to reach the purpose that has improved security of products.
To achieve these goals, the present invention adopts following scheme to implement: the fire detection and control method of micro-wave oven of the present invention is by constituting with the next stage: under the micro-wave oven air throttle closing state, judge the stage of whether condition of a fire taking place in the shell and setting fiducial temperature; By microwave cooked function, control micro-wave oven air throttle opens or closes the stage of state; Under the micro-wave oven air throttle closing state, detect the stage whether interior temperature of shell is higher than the fiducial temperature of setting; In the above-mentioned stage, as detect the condition of a fire, the stage of cutting off the electricity supply immediately.
Above-mentioned detection control method, under micro-wave oven air throttle closing state, utilization is judged the stage whether condition of a fire takes place in the shell with the variation of the voltage slope of temperature.
Above-mentioned detection control method is under the state that the micro-wave oven air throttle leaves, in order to judge the stage of whether condition of a fire taking place in the shell and setting maximum temperature; Under the state that the micro-wave oven air throttle leaves, whether temperature is higher than the stage of the maximum temperature of setting in the shell.
In sum, effect of the present invention is as follows: above-mentioned detection makes client prevent fire in advance.In when, in the shell condition of a fire taking place when, detected by temperature detection sensor, thereby cut off the electricity supply immediately, prevent fire, improved security of products, make this product of the relieved use of clients.
Description of drawings
Fig. 1 is the exploded view of general micro-wave oven.
Fig. 2 is the damper position perspective view of micro-wave oven.
Fig. 3 is by existing technology for detection and controls the action flow chart of the micro-wave oven condition of a fire.
Fig. 4 is the position perspective view of the present invention's thermistor of detecting the micro-wave oven condition of a fire.
Fig. 5 is the control pie graph that the present invention detects the micro-wave oven condition of a fire.
Fig. 6 is the state that opens or closes by the micro-wave oven air throttle, the state diagram of cutting off the electricity supply.
When Fig. 7 is the cooking, the state diagram of voltage and variations in temperature.
Fig. 8 a, 8b are the action flow charts that the present invention detected and controlled the micro-wave oven condition of a fire.
Among the figure:
1: shell 2: cooking room
3: electricity storage chamber 4: magnetron
5: front panel 6: air entry
7: top panel 8: exhaust outlet
9: heater 11: porous portion
12: cover of heater 13: air throttle
14: fan electromotor 15: signal input part
20: temperature detecting part 25: power control part
30: drive division 35: power suppling part
S: thermistor T: rotating disk
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail: below be that the fire detection and control method of micro-wave oven of the present invention: Fig. 4 is the position perspective view of the present invention's thermistor of detecting the micro-wave oven condition of a fire.As shown in the figure, at exhaust outlet 8 temperature-detecting device thermistor S is installed.The heater energy flow in the shell 1 by porous portion 11, along with the rotation of the rotating disk T in the shell 1, realizes the heating of food.
Fig. 5 is the control pie graph that the present invention detects the micro-wave oven condition of a fire, as shown in the figure, and microwave oven supply power supply unit 35; Cooking function is selected signal section 15; Press cooking function and select signal section 15, the drive division 30 of heat food; Detect the temperature detecting part 20 of temperature in the shell 1; Judge unusual overheated in the shell 1 and the control part 25 of cutting off the electricity supply by the temperature that detects.The effect of temperature detecting part 20 among the present invention, S finishes by thermistor.In addition, temperature detecting part 20 has various effect.Heater 9 energy flow in the shell 1 by porous portion 11, realize the heating of food along with the rotation of the rotating disk T in the shell 1.In order to judge whether the condition of a fire takes place in the shell 1, thermistor S detects the temperature in the shell 1.The temperature signal that thermistor S detects is sent to control part 25, and judges according to temperature signal whether the condition of a fire takes place in the shell 1.Assert the condition of a fire takes place in the shell 1, control part 25 is cut off the electricity supply immediately.
Fig. 6 is the state that opens or closes by the micro-wave oven air throttle, the state diagram of cutting off the electricity supply, and specifically as shown in the figure, under the state that air throttle 13 is opened, the thermistor S that is positioned at exhaust outlet 8 detects the temperature of shell 1.The temperature that thermistor S detects surpasses 160 ℃, then temperature signal is sent to control part 25, and control part 25 is assert the generation condition of a fire in the shell 1, cuts off the electricity supply immediately.On the other hand, under air throttle 13 closing state, the thermistor S that is positioned at exhaust outlet 8 detects the temperature of shell 1.The temperature that thermistor S detects surpasses 270 ℃, then temperature signal is sent to control part 25, and control part 25 is assert the generation condition of a fire in the shell 1, cuts off the electricity supply immediately.
When Fig. 7 is the cooking, the state diagram of voltage and variations in temperature, specifically as shown in the figure, when in the shell 1 condition of a fire taking place, with the unexpected rising of temperature, thermistor S detects the breaking out of fire of shell 1 inside.Shown in promptly figure went up, the negative value of gathering descending slope with the urgency of voltage became big, and temperature rises suddenly.Assert according to the temperature of above-mentioned unexpected rising the condition of a fire has taken place in the shell 1.Slope in the above-mentioned figure is big more, means that the rising of temperature in the shell 1 is fast more.
The motion flow process of the above-mentioned detection and the control micro-wave oven condition of a fire is as follows: Fig. 8 a, 8b are the action flow charts that the present invention detected and controlled the micro-wave oven condition of a fire.Specifically shown in Fig. 8 a, micro-wave oven has possessed all the 200th stages of cooking function; The user selects needed the 210th stage of function under the above-mentioned state in cooking method; The cooking function signal of selecting is judged cooking method by control part 25, and controls the state that micro-wave oven air throttle 13 opens or closes.When the cooking function signal of selecting used microwave, control part 25 drove for the 220th stage under the state that air throttle 13 is opened; When driving under the state that air throttle 13 is opened, the thermistor S that is positioned at exhaust outlet 8 detects above-mentioned temperature.Control part 25 has been set the maximum temperature that detects under the state that air throttle 13 is opened, when reaching maximum temperature, in the control part 25 identification shells 1 condition of a fire has taken place.The maximum temperature of having set is 160 ℃.Be control part 25 under the state that air throttle 13 is opened, judge whether the temperature that detects by thermistor S reaches 160 ℃ of the 230th stage; According to the judgement of control part 25, detect the condition of a fire has taken place in the shell 1, and disconnect relay.The disconnection of relay is ended driving magnetron, thereby was cut off the electricity supply for the 240th stage.If in the 220th stage, the user has selected fan electromotor or flash-cook in cooking method, then drives with heater dedicated.When the user has selected microwave in cooking method, because of the direct heat food of microwave, so ambient air temperature can not influence the heating of food.Promptly flowing into shell 1 interior cold air can not influence the heating of food.
But when food was heated with heater, the air themperature of food periphery was in high hot state.In order to prevent the past external leakage of hot gas in the shell 1, utilize air throttle 13 to block the inflow entrance that air flows, forbid that air flow in the shell 1.So control air throttle 13 makes it to close when selecting convection type, forbid that air flows in the shell 1.
Under air throttle 13 closing state, the thermistor S that is arranged in exhaust outlet detects the 250th stage of hot gas that the cooking produces.When air throttle is closed, and when in the shell 1 condition of a fire taking place, does not wait flame to spray outward, thermistor S has detected the poly-rising of urgency of temperature.Thermistor S has set from the shell 1 interior maximum temperature that detects.So reach the maximum temperature of setting, the condition of a fire has taken place in the thermistor S identification shell 1, above-mentioned signal is sent to control part 25.The maximum temperature of thermistor S is 270 ℃ in this control action flow chart.
Other the 250th stage is if the required voltage of driving relay descends suddenly then above-mentioned signal is sent to control part 25.In the control part 25 identification shells 1 condition of a fire has taken place or be in high hot state.Control part 25 is sent to fire signal on the wiring board, and stops the driving of micro-wave oven by relay, thereby cuts off the electricity supply for the 260th stage.
The another kind of flow chart of the control method of the detection micro-wave oven condition of a fire is as follows: specifically shown in Fig. 8 b, micro-wave oven has possessed all the 300th stages of cooking function; The user selects needed the 310th stage of function in cooking method; The cooking function signal of selecting is judged cooking method by control part 25, and controls the state that micro-wave oven air throttle 13 opens or closes.When the cooking function signal of selecting used microwave, under the state that air throttle is opened, control part 25 drove for the 320th stage; When under the state that air throttle is opened, driving, be positioned at the temperature of the thermistor S detection of exhaust outlet 8.Control part 25 has been set the maximum temperature that detects under the state that air throttle 13 is opened, when reaching maximum temperature, in the control part 25 identification shells 1 condition of a fire has taken place.The maximum temperature of having set is 160 ℃.Be control part 25 under the state that air throttle 13 is opened, judge whether the temperature that thermistor S detects reaches 160 ℃ of the 330th stage; The judgement of control part 25 detects the condition of a fire has taken place in the shell 1, and disconnects relay.The disconnection of relay stops driving magnetron, thereby cut off the electricity supply for the 340th stage.If in the 320th stage, the user has selected fan electromotor or flash-cook in cooking method, then drives with heater dedicated.When the user has selected microwave in cooking method, because of the direct heat food of microwave, so ambient air temperature can not influence the heating of food.Promptly flowing into shell 1 interior cold air can not influence the heating of food.
But when food was heated with heater, the air themperature of food periphery was in high hot state.In order to prevent the past external leakage of hot gas in the shell 1, utilize air throttle 13 to block the inflow entrance that air flows, forbid that air flow in the shell 1.So when selecting convection type, control moral valve 13 makes it to cut out, and forbids that air flows in the shell 1.Under the air throttle closing state, the thermistor S that is arranged in exhaust outlet 8 detects the 350th stage of hot gas that the cooking produces.It is promptly shown in Figure 7,, when the voltage slope with temperature is big more, mean the condition of a fire has taken place in the shell 1, and pass the signal to control part 25.Thereby the control part 25 of receiving signal was cut off the electricity supply for the 360th stage.In other the 360th stage,, then judge according to final temperature whether the condition of a fire takes place in the shell 1 if the voltage slope that thermistor S does not detect with temperature becomes big.Be that the maximum temperature that temperature-sensitive resistance S has set is 270 ℃,, then judge whether take place in the shell 1 the 370th stage of the condition of a fire according to 270 ℃ of maximum temperatures if the voltage slope that thermistor S does not detect with temperature becomes big.Pass the signal to control part 25.Thereby the control part 25 of receiving signal was cut off the electricity supply for the 360th stage.
When micro-wave oven drives to turn-off air throttle, can detect by thermistor S whether the condition of a fire takes place in the shell 1.Shown on the figure, under the state that air throttle 13 turn-offs, the thermistor S that is positioned at exhaust outlet 8 detects the temperature of shell 1.The condition of a fire has taken place in the control part 25 identification shells 1 when reaching maximum temperature, and has cut off the electricity supply immediately in thermistor S detected temperature.When the voltage slope with temperature is big more, mean the condition of a fire has taken place in the shell 1.But the voltage slope that thermistor S does not detect with temperature becomes big, then judges according to final temperature whether the condition of a fire takes place in the shell 1.
Power of the present invention is not limited to above-mentioned illustrating, and in the field of the invention, allows other people to carry out diversified change and transformation intra vires.
Claims (1)
1. the fire detection and control method of a micro-wave oven is characterized in that, presses the microwave cooking function, and control micro-wave oven air throttle (13) opens or closes the stage of state; Under micro-wave oven air throttle (13) closing state, judge the stage of whether condition of a fire taking place in the shell (1) and setting fiducial temperature; Under micro-wave oven air throttle (13) closing state, detect the stage whether interior temperature of shell (1) is higher than the fiducial temperature of setting; Under the state that micro-wave oven air throttle (13) leaves, in order to judge the stage of whether condition of a fire taking place in the shell (1) and setting maximum temperature; Under the state that micro-wave oven air throttle (13) leaves, whether the interior temperature of shell (1) is higher than the stage of the maximum temperature of above-mentioned setting; The stage of in the shell (1) whether the condition of a fire taking place is judged in utilization with the variation of the voltage slope of temperature; Detect the condition of a fire in the above-mentioned stage, the stage of then cutting off the electricity supply immediately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021175055A CN1299058C (en) | 2002-04-29 | 2002-04-29 | Fire detection and control method for microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021175055A CN1299058C (en) | 2002-04-29 | 2002-04-29 | Fire detection and control method for microwave oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1455173A CN1455173A (en) | 2003-11-12 |
| CN1299058C true CN1299058C (en) | 2007-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021175055A Expired - Fee Related CN1299058C (en) | 2002-04-29 | 2002-04-29 | Fire detection and control method for microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1299058C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9418528B2 (en) | 2014-06-20 | 2016-08-16 | Haier Us Appliance Solutions, Inc. | Oven appliance with cavity fire detection |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4133995A (en) * | 1977-08-30 | 1979-01-09 | Litton Systems, Inc. | Method of fire detection in a microwave oven |
| US4496817A (en) * | 1983-07-07 | 1985-01-29 | General Electric Company | Automatic fire detection for a microwave oven |
| FR2573605A1 (en) * | 1984-11-16 | 1986-05-23 | Esswein Sa | Microwave oven provided with a fire-protection device |
| KR20010055710A (en) * | 1999-12-11 | 2001-07-04 | 구자홍 | Method for fire prevention in microwave oven |
| KR20020021953A (en) * | 2000-09-18 | 2002-03-23 | 구자홍 | Safity Device from Firing by Damper |
| KR20020022952A (en) * | 2000-09-21 | 2002-03-28 | 윤종용 | Microwave oven and controlling method there of |
-
2002
- 2002-04-29 CN CNB021175055A patent/CN1299058C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4133995A (en) * | 1977-08-30 | 1979-01-09 | Litton Systems, Inc. | Method of fire detection in a microwave oven |
| US4496817A (en) * | 1983-07-07 | 1985-01-29 | General Electric Company | Automatic fire detection for a microwave oven |
| FR2573605A1 (en) * | 1984-11-16 | 1986-05-23 | Esswein Sa | Microwave oven provided with a fire-protection device |
| KR20010055710A (en) * | 1999-12-11 | 2001-07-04 | 구자홍 | Method for fire prevention in microwave oven |
| KR20020021953A (en) * | 2000-09-18 | 2002-03-23 | 구자홍 | Safity Device from Firing by Damper |
| KR20020022952A (en) * | 2000-09-21 | 2002-03-28 | 윤종용 | Microwave oven and controlling method there of |
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| Publication number | Publication date |
|---|---|
| CN1455173A (en) | 2003-11-12 |
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