MXPA99002991A - Microwave oven mounted on the wall and method of control for the mi - Google Patents

Abstract

A wall-mounted microwave oven is provided, which includes a body that forms therein a cavity to accommodate the food to be cooked, a magnetron to generate the electromagnetic waves that will be supplied to the cavity by a surrounding housing the body and forming a bell duct having an inlet connection placed in the lower portion of the housing and an outlet connection placed in the upper position thereof, and a bell fan installed in the bell duct; Wall mounted microwave includes a bell sensor to detect a state in which the operation of said bell fan is necessary. A first switch to selectively supply one of two voltages, either a low level voltage or a normal voltage to the magnetron, and a controller to control the bell fan for which it operates if a detection signal informs that the operation of said fan The bell is necessary is issued from the bell sensor and simultaneously controls the first switch to change the electrical energy that is supplied to the magnetron from a normal voltage to a low level voltage. Accordingly, the microwave oven can control the operation of a bell fan based on a detection signal picked up by a bell sensor and simultaneously, reduce the voltage level of electrical power supplied to the magnetron, thus effectively preventing it from being applied. an overload to the microwave oven

Description

MICROWAVE OVEN MOUNTED ON THE WALL AND METHOD OF CONTROL FOR THE SAME BACKGROUND OF THE INVENTION '5 FIELD OF THE INVENTION The present invention relates to a wall-mounted microwave oven and a control method for the same, more particularly to a wall-mounted microwave oven that includes a body that forms a cavity to accommodate the food to be cooked and a magnetron to generate the electromagnetic waves that will be delivered to the cavity, a housing that surrounds the body and that form a bell duct that has an inlet connection placed in the The lower portion of the housing and an outlet connection placed in the upper portion thereof, and a hood fan installed in the hood duct and a control method therefor.

DESCRIPTION OF THE RELATED ART 0 As shown in Figure 1, a wall-mounted microwave oven is mounted on a wall above a burner 50, and has a function of absorbing vapors and fumes generated when the food is cooked in burner 50 and ejected, so that the microwave oven can serve as a bell. As shown in figures 1 and 2 the wall-mounted microwave oven is composed of a body 3 having a cavity 4 in which the food is accommodated and a housing 6 surrounding the body 3. A magnetron 30 which provides electromagnetic waves to the cavity 4 is mounted in the body 3. The magnetron 30 receives a high voltage current through a high voltage transformer (not shown) and a high voltage capacitor (not shown). Meanwhile, accommodation 6 includes a superior accommodation 6a surrounding the upper portion and both lateral surfaces of the body 3 and a lower housing 6b combined with the lower portion of the body 3. The conduit of the bell 15 which is a route for expelling vapors and fumes, is formed in the space between the housing 6 and the body 3. For this to be accomplished, an inlet connection 8 for absorbing the vapors and fumes within the hood duct 15 is formed in the lower housing 6b and an outlet connection 9 is formed on the upper surface of the upper housing 6a. An exhaust duct 11 is connected to the outlet connection 9. The exhaust duct 11 is connected to an expulsion route 17 which penetrates the wall and communicates with the air. A bell fan 13 is installed in the upper portion of the body 3 in the vicinity of the outlet connection 9, to adequately expel the absorbed fumes and fumes towards the hood duct 15 through the inlet connection 8 towards the air through the outlet connection 9. Meanwhile, a bell lamp 55 for illuminating the burner 50 is installed in the bottom of the lower housing 6b. Meanwhile, a user can choose from several selection buttons provided on an operations control panel, so that the bell fan 13 is activated or deactivated. That being the case, a bell sensor is provided in the inlet connection 8 or the inner portion of the bell duct 15 thereby generating a heat detection signal as a control signal so that it can supply electrical power to the fan of hood 13 or separating the fan 13 from the electric current in accordance with an ambient air temperature. The bell sensor is generally formed of a bi-metal and is turned on if the ambient temperature is above a predetermined temperature. The bell sensor is interposed between a bell fan motor 45 and an electrical power source and generates a control signal to turn the power source on and off of the hood fan motor 45, respectively, whether it is connected to and disconnected. detect heat or not. In the case where the magnetron 30 has an energy consumption of over 1 KW and the bell lamp 55 having an energy consumption of 80W or the magnetron 30 having an energy consumption of about 1 KW and the hood fan 13 which has an energy consumption of 150W-200W operate simultaneously, a fuse in a distribution panel is blown and in this way the electric power is cut off, since the microwave oven could have been overloaded. Accordingly, the wall-mounted microwave oven may choose that electrical power be supplied to the magnetron 30 at a voltage less than the normal voltage to adequately prevent the microwave oven from being overloaded or accepting user selection. However, for a conventional wall-mounted microwave oven, the controller 10 does not know when the bell fan 13 is being operated without the instructions of the controller 10 according to the bell sensor formed of a bimetal. Therefore, the controller 10 can not control a voltage level for the magnetron 30 in the event that the bell fan 13 operated by the bell sensor formed of a bimetal and the problem of overload can not be effectively solved at the same time. weather.

BRIEF DESCRIPTION OF THE INVENTION To solve the above problems, it is an object of the present invention to provide a wall-mounted microwave oven which can prevent an overload from being applied by decreasing the voltage of the electrical power for a magnetron in case a fan bell and a magnetron are operated simultaneously and a method of control for them.

Another object of the present invention is to provide a wall-mounted microwave oven which can prevent an overload to the same by driving a bell fan at low speed in the event that a bell fan and a magnetron are operated simultaneously , and a control method for it. To achieve the above object of the present invention, a wall-mounted microwave oven is provided which comprises a body forming in itself a cavity for accommodating the food to be cooked, a magnetron for generating electromagnetic waves which are supplied to the cavity, a housing that surrounds the body and forms a bell duct that has an inlet connection placed in the lower portion of the housing and an outlet connection placed in the upper portion thereof, and a bell fan installed in the duct of hood, comprising the wall-mounted microwave oven: a bell sensor for detecting a state in which bell fan operation is needed; a first switch for selectively providing one of two voltages, a low level voltage or a normal voltage to the magnetron; and a controller to control the bell fan, to operate if a signal that the operation of said bell fan is necessary, is input from the bell sensor and simultaneously controls the first switch to change the electric power that is being supplied to the magnetron from a normal voltage to a low level voltage.

Here, it is preferable for the controller to control the first switch to change the electrical power for the magnetron from a low level voltage to the normal voltage in the event that the signal informing that the operation of said bell fan is necessary is not supplied from the bell sensor. The wall-mounted microwave oven further includes a second switch for selecting the rotational speed of the bell fan to operate either at comparatively high speed or at comparatively low speed. It is preferable that the controller controls the second switch operating the bell fan at a low speed when the bell fan and the magnetron are operated simultaneously. Meanwhile, a control method for controlling a wall-mounted microwave oven comprising a body forming a cavity to accommodate the food to be cooked is also provided, a magnetron for general electromagnetic waves that are supplied to the cavity, a housing that surrounds the body and forms a bell duct that has an inlet connection placed in the lower portion of the housing and an outlet connection in the upper portion thereof, and a bell fan installed in the bell duct , the control method of the wall-mounted microwave oven comprising the steps of: detecting a state in which the operation of the bell fan is needed, and supplying a normal voltage to the magnetron when a signal informing of the operation of said bell Bell fan is not detected, and supply a low level voltage lower than the normal voltage to the magnetron at the same time When the bell fan is being used when the signal informing of the operation of said bell fan is detected. Here, it is preferable that the bell fan be operated at a comparatively high speed during de-energization of the magnetron and at a comparatively low speed during magnetron energization.

BRIEF DESCRIPTION OF THE DRAWINGS The above objects and advantages of the present invention will be made apparent by description of the structure and operation thereof in detail with reference to the appended drawings in which: Figure 1 is a schematic view showing a configuration of a mounted microwave oven in the wall in accordance with the present invention when it has been installed on a wall; Figure 2 is a partially exploded perspective view showing a wall-mounted microwave oven in accordance with the present invention; Figure 3 is a circuit diagram of a wall-mounted microwave oven in accordance with the present invention; Fig. 4 is a flow diagram for explaining a method for controlling the wall-mounted microwave oven of Fig. 3.

DETAILED DESCRIPTION OF THE INVENTION A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. A wall-mounted microwave oven in accordance with the present invention has the same configuration as that shown in Figures 1 and 2, the detailed description of the structure of the present invention will therefore be omitted. Figure 3 is a circuit diagram of a wall-mounted microwave oven in accordance with the present invention. As shown in Figure 3, a driving circuit for a wall-mounted microwave oven is comprised of a bell driving portion 20 coupled between a first and second power supply lines 1 and 2, commercial and a portion of the circuit of the microwave oven 60 connected in parallel with the bell driver 20, to control the electrical power for a pulse circuit portion of the magnetron 90 that will be supplied through a high voltage transformer 80. The microwave circuit portion 60 includes an electric lamp of the cooking chamber 61 and a switch of the cooking chamber 62 formed between the first and second commercial lines 1 and 2 of power supply, and a stirrer motor 63 and an electric blower motor connected to the air ejector in parallel with each other between the first commercial electricity supply line 1 and an electric line connecting the electric lamp 6 1 of the cooking chamber and switch 62 of the cooking chamber. Meanwhile, a first switch 70 for selecting the level of a voltage to be supplied to a high-voltage transformer 80 for energizing the magnetron 30 is connected between the second commercial power supply line 2 and the induction coil of the transformer 80. of high voltage, and is formed of a normal voltage contact 71 which is turned on when high voltage electrical power is emitted, and a low level voltage contact 72 which is turned on when low electrical power is emitted. Here, the normal voltage contact 71 is connected with an intermediate wire on the induction coil and the low level voltage contact 72 is connected to one end of the induction coil. Meanwhile, the bell driving portion 20 includes a bell lamp 55 connected between the first and second commercial power lines 1 and 2 and a bell lamp switch 27 to supply electric power to the bell lamp 55 or to separate it from the same. The bell drive portion 20 further includes a bell fan motor 45 connected between the first and second commercial power lines 1 and 2, connected in parallel with the bell lamp 55 and the bell lamp switch 27, a switch of bell fan 22 for supplying electric power to hood fan 45 or to separate it from hood, and a second switch 23 for selecting the fan speed of bell fan motor 45 to operate at either low or high speed speed. The second switch 23 is turned on towards a high-speed contact 23a or a low-speed contact 23b under the control of a controller 10. A bell sensor 7 for detecting heat or smoke, for example generated from a burner of figure 1 and providing a detection signal that informs that the operation of said bell fan motor 45 is necessary is further connected to the controller 10. If a heat or smoke detection signal is powered from the bell sensor 7 the controller 10 turns on the bell fan switch 22 at low or high speed, to then supply electrical power to the bell fan motor 45. Figure 4 is a flow diagram illustrating a process of controller control 10. If power is applied to the wall-mounted microwave oven, the controller 10 judges whether heat or vapors are being detected by the bell sensor 7 (S10). If a heat or smoke detection signal from the bell sensor 7 is supplied, the controller 10 confirms whether the magnetron 30 is energized or not (S20). Here, if it is judged that the magnetron 30 is energized, the controller 10 turns on the low speed control 23b of the second switch 23 to properly propel the bell fan 13 at low speed, and turn on the low level voltage contact 72 of the first switch 70 for suitably supplying a low level voltage to magnetron 30 (S30). When the magnetron 30 is not energized (S20), the bell fan 13 is driven at high speed (S60). Then it is judged whether a corresponding cooking time ends (S40). If the corresponding cooking time has ended, no electric power is supplied to the magnetron 30 (S55). At the same time, the second switch 23 is changed from the low speed contact 23b to the high speed contact 23a, to drive the bell fan 13 at high speed (S60). Furthermore, if the cooking time (S40) continues, it is judged whether heat is continuously detected (S45). If heat or smoke is continuously detected in step S45, the program returns to step S40 to judge whether the cooking time has been completed. If the heat is no longer detected in step S45, the pulse of the bell fan 13 stops (S50), and a normal voltage is simultaneously supplied to the magnetron 30 (S120). If the bell fan 13 operates at high speed in step S60, it is thus confirmed that heat or vapors are continuously being detected (S70). If heat or vapors are no longer detected in step S70, the bell fan 13 is controlled to stop (S80) and the program returns to its initial state (S90). Meanwhile, if the heat is continuously detected in step S70, it is confirmed if a new cooking cycle (S100) is started. If no cooking cycle is started in step S100, the program returns to step S70 to confirm whether or not heat or vapors are detected.

If a cooking period is performed in step S100, the bell fan 12 is driven at low speed, and then the program proceeds to step S30 to supply a low level voltage to the magnetron 30. Meanwhile, in the case of no longer detecting heat or vapors in the bell sensor 7 in step S10, the controller 10 confirms whether a cooking cycle is being carried out (S110). If a cooking cycle is being performed in step S110, the normal voltage contact 71 of the first switch 70 is turned on, to supply a normal voltage to the magnetron 30 (S120). Then, if a heat or smoke detection signal is supplied from the bell sensor 7, the program proceeds to step S30, to operate the bell fan 13 at low speed and to supply a low level voltage to the magnetron 30. If the heat or smoke detection signal is no longer detected in step S130, the controller 10 judges whether the cooking time is finished (S140). If the cooking time is complete, the electrical energy for the magnetron 30 is disconnected (S150), and then the program returns to its initial state (S160). With the above construction, the controller 10 controls the motor 45 of the bell fan to be driven at low speed in accordance with the bell sensor detection signal 7a which reports that the operation of said bell fan 13 is necessary, when the bell fan 13 and the magnetron 30 operate simultaneously. At the same time, the controller 10 controls the normal voltage that is supplied to the magnetron 30, thereby preventing the microwave oven from being overloaded. In the event that only the hood fan motor 45 operates the hood fan it is controlled to operate at high speed to increase the ejection efficiency. When only the magnetron 30 operates the normal voltage is supplied to the magnetron 30, decreasing the cooking time. As described above, the microwave oven according to the present invention can control the operation of a bell fan based on a detection signal received by a bell sensor and simultaneously lowers the voltage level of electrical power that is supplied. to the magnetron, thereby effectively preventing an overload from being applied to the microwave oven.

Claims (5)

NOVELTY OF THE INVENTION CLAIMS

1. - A wall-mounted microwave oven comprising a body that forms therein a cavity to accommodate the food to be cooked, a magnetron to generate electromagnetic waves that will be supplied in the cavity, a housing that surrounds the body and that It forms a bell duct having an outlet connection positioned in the lower portion of the housing and an outlet connection positioned in the upper portion thereof, and a bell fan installed in the bell duct comprising the microwave oven mounted in the hood. wall: a bell sensor to detect a state in which bell fan operation is needed; a first switch for selectively supplying one of two voltages, either a low level voltage or a normal voltage to the magnetron; and a controller for controlling the bell fan to operate if a signal informing that the operation of said bell fan is necessary is powered from the bell sensor and simultaneously controlling the first switch to change the electric power supplied to the magnetron from a voltage normal to a low level voltage.

2. The wall-mounted microwave oven according to claim 1, further characterized in that said controller controls the first switch for changing the voltage of electric power that is supplied to the magnetron from a low level voltage to a normal voltage in the case that the detected signal informs that the operation of said bell fan is necessary is not supplied by the bell sensor.

3. The wall-mounted microwave oven according to claim 1 further characterized in that it comprises a second switch for selecting the rotational speed of the bell fan to operate either at a comparatively high speed or at a comparatively low speed, and characterized in addition because said controller controls the second switch that operates the bell fan at low speed when the bell fan and the magnetron are operated simultaneously.

4. A control method for controlling a wall-mounted microwave oven comprising a body that forms inside a cavity to accommodate the food to be cooked, a magnetron to generate electromagnetic waves that will be delivered to the cavity, a housing surrounding the body and forming a bell duct having an inlet connection placed in the lower portion of the housing and an outlet connection placed in the upper portion thereof, and a bell fan installed in the bell duct , the control method of the wall-mounted microwave oven comprising the steps of: detecting a state of information that the operation of said bell fan is necessary; and supplying a normal voltage to the magnetron when a signal is not detected that indicates that the operation of said bell fan is necessary and supplying a low level voltage lower than the normal voltage to the magnetron at the same time when operating the bell fan when the status that informs that the operation of said bell fan is necessary is detected.

5. The control method for controlling a wall-mounted microwave oven according to claim 4, further characterized in that said bell fan is operated at a comparatively high speed during de-energization of the magnetron and at a comparatively low speed during the energization of the magnetron. SUMMARY OF THE INVENTION A wall-mounted microwave oven is provided which includes a body that forms therein a cavity to accommodate the food to be cooked, a magnetron to generate the electromagnetic waves that will be delivered to the cavity a housing surrounding the body and forming a bell duct having an inlet connection placed in the lower portion of the housing and an outlet connection placed in the upper position thereof, and a bell fan installed in the bell duct; the wall-mounted microwave oven includes a bell sensor to detect a state in which the operation of said bell fan is necessary; a first switch for selectively supplying one of two voltages, either a low level voltage or a normal magnetron voltage, and a controller for controlling the bell fan so that it operates if a detection signal informs that said operation Bell fan is needed is issued from the bell sensor and simultaneously controls the first switch to change the electric power that is supplied to the mangetron from a normal voltage to a low level voltage; consequently, the microwave oven can control the operation of a bell fan based on a detection signal picked up by a bell sensor and simultaneously reduce the voltage level of electric power supplied by the magnetron, thus effectively preventing it from being applied an overload to the microwave oven. P99 / 347 JT / jhp * aom *