KR20020027151A - Microwave oven - Google Patents

Abstract

PURPOSE: A microwave oven is provided to open/close a louver depending upon an operation of a hood switch irrespective of a normal operation of a control unit controlling the louver. CONSTITUTION: A microwave oven includes a main body having a suction port formed on a front side of the main body, a hood inlet port and a hood outlet port; a hood fan installed within the main body and discharging air drawn through the suction port and the hood inlet port outside the microwave oven through the hood outlet port; a suction louver opening/closing the suction port; a louver driving motor driving the suction louver; a hood switch turned on over a predetermined temperature and supplying a power to the hood fan; and a hood driving circuit part supplying the power to the louver driving motor so as to open the louver, depending upon a turn-on state of the hood switch.

Description

Microwave oven {MICROWAVE OVEN}

The present invention relates to a microwave oven, and more particularly, to a microwave oven in which a louver is opened and closed in conjunction with an operation of a hood switch regardless of whether a control unit is normally operated.

Referring to FIG. 1, the wall-mounted microwave oven has a main body 3 having a rectangular cylindrical cavity 4 in which food is accommodated, and a casing 6 surrounding the main body 3. On the front surface of the main body 3, a door 7 for opening and closing the cavity and an operation panel 5 for operating the cooking state are mounted. In addition, a suction grill 27 is provided in the upper portion of the door 7 and the operation panel 5 along the transverse direction of the main body 3.

The casing 6 consists of an upper casing 6a surrounding the upper side and both sides of the main body 3, and a lower casing 6b coupled to the lower part of the main body 3. A predetermined space is formed between the upper surface of the upper casing 6a and the upper portion of the main body 3, and a duct member 14 is provided at the rear of the suction grill 27 so that the suction grill is provided. Guide the flow of air drawn in from 27. On the other hand, in the space between the both sides of the upper casing (6a) and the main body 3, a hood duct 15, which is an exhaust passage for discharging moisture and smoke generated from the gas stove, is formed.

The lower casing 6b has a hood inlet 8 for introducing moisture and smoke into the hood duct 15, and the upper surface of the upper casing 6a has moisture and smoke introduced through the hood inlet 8. Hood outlet 9 for discharging the outside is formed. In addition, a hood fan 13 is provided in an area adjacent to the hood outlet 9 of the main body 3, and moisture introduced into the hood duct 15 through the hood inlet 8 when the hood fan 13 is operated. And smoke is discharged to the outside through the hood outlet 9. The hood duct 15 is provided with a hood switch (not shown) that is turned on when the temperature in the hood duct 15 rises more than a certain amount. The hood switch is formed of a TCO using bimetal, and a hood fan (when the hood switch is turned on). 13) is activated.

On the other hand, the conventional suction grill 27 is formed of only a plurality of blades and the intake port like the general grill. As a result, problems such as penetration of dust through the intake port and deterioration of appearance appear. In order to improve this problem, a microwave oven in which a louver 25 is installed in a conventional suction grill 27 is provided. The suction grille 27 provided with the louver 25 includes a rectangular frame-shaped grill frame 26 provided on the front surface of the main body 3 and a plate-shaped louver 25 rotatably provided in front of the grill frame 26. And a louver driving device 20 controlled by the control unit to operate the louver 25.

On the other hand, when the user cooks food using such a gas stove, when the temperature in the hood duct 15 rises more than a predetermined time, the hood switch is turned on so that the hood fan 13 is automatically operated. When the hood fan 13 is operated, the controller detects the operation of the hood fan 13 to operate the louver driving device 20 to open the louver 25.

However, when the control unit does not operate normally due to various factors, even if the temperature in the hood duct 15 increases and the hood fan 13 operates, the control unit does not detect the operation of the hood fan 13. Accordingly, since the louver 25 is not opened and air cannot be sucked through the louver 25, as the space in which the duct member 14 is installed in accordance with the operation of the hood fan 13 becomes a vacuum state, the hood The problem that the load is added to the fan 13 will occur.

Accordingly, it is an object of the present invention to provide a microwave oven for opening and closing the louver in conjunction with the operation of the hood switch regardless of whether the control unit is operating normally.

1 is a perspective view of a wall-mounted microwave oven,

2 is a partial cross-sectional view of the microwave louver region according to the present invention;

3 is a louver driving circuit diagram according to an embodiment of the present invention;

4 is a louver driving circuit diagram according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

20: louver drive device 25: louver

26: grill frame 27: suction grill

30: louver drive motor 31: first switching unit

32: second switching unit 33: hood operation switch

35: cam 36: first micro switch

37: second micro switch 40: louver relay

41: first transistor 42: second transistor

50: hood switch 51: hood switch

52: photo coupler 53: power supply switch

54 condenser 55 drive switch

The object is, according to the present invention, a main body having a front inlet, a hood inlet and a hood outlet; An electron installed in the main body and having a hood fan for discharging air introduced through the inlet and the hood inlet through the hood outlet, an inlet louver for opening and closing the inlet, and a louver driving motor for opening and closing the inlet louver A stove comprising: a hood switch turned on at a predetermined temperature or more to supply power to the hood fan to operate the hood fan; It is achieved by a microwave oven, characterized in that it comprises a louver driving unit for supplying power to the louver driving motor to open the intake louver in conjunction with the turn-on of the hood switch.

And a micro switch connected to the intake louver to generate a microswitching signal; The driving circuit is connected between the hood switch and the micro switch, and preferably operates the louver driving motor in response to the hood switching signal and the micro switching signal.

It is preferable to further include first and second switching portions coupled between the louver driving motor and the driving circuit and connecting the driving circuit to the louver driving motor when the louver is not open.

The driving circuit may include a driving switch connected to the louver driving motor for supplying power to the louver driving motor, and a power supply switch for driving the driving switch when the hood switch is turned on.

The first switching unit has a first micro switch turned on and off according to opening and closing of the inlet louver, and a first transistor on and off connected to the first micro switch and connected to the driving switch; The second switching unit preferably has a second micro switch connected in parallel with the first micro switch, and a second transistor connected in parallel with the first transistor.

Preferably, the first and second switching units are connected in parallel with the louver driving motor and the driving circuit.

On the other hand, the object is, according to another embodiment of the present invention, in the microwave, a cavity for cooking food, a grill member connected to the cavity to form a first air passage, a hood to form a second air passage A main body including a duct, a hood fan disposed in the hood duct, and a hood motor coupled to the hood fan; A louver mounted to the grill member to open and close the first air passage; A louver motor for driving the louver; A hood switch connected to the hood motor to move the hood motor to generate the hood switching signal; It may also be achieved by a microwave oven comprising a drive circuit connected between the louver motor and the hood switch to move the louver motor in response to the hood switching signal.

The apparatus may further include a louver switch unit disposed between the driving circuit and the louver motor to connect the driving circuit to the louver motor.

The louver switch unit may include: a louver switch connected to the louver and generating a louver switching signal indicating one of an open and a closed state of the louver; And a driver connected to the louver switch and disposed between the driving circuit and the louver motor and connecting the driving circuit and the louver motor in response to the louver switching signal.

The louver motor may be operated according to the hood switching signal and the louver switching signal to open the louver.

The driving circuit and the louver switch circuit are preferably connected in series with the louver motor.

A control unit coupled to the hood switch and the louver switch unit to generate an operation signal in response to the hood switch and the louver switch unit; The apparatus may further include an operation switch disposed between the louver motor and the control unit to operate the louver motor in response to the operation signal.

The driving circuit and the operation switch are preferably connected in parallel with the louver.

The first air passage and the second air passage may be formed to communicate with each other in the hood fan area.

It is preferable to further include a first switching unit and a second switching unit connected in parallel to the drive circuit.

The first switching unit and the second switching unit include: a micro switch connected to the louver and operating in a closed state, during opening, and during closing; And a driver connected to the micro switch and disposed between the driving circuit and the louver motor and connecting the louver motor to the driving circuit according to the louver switching signal.

Preferably, the louver motor is operated to open the louver according to the hood switching signal and the louver switching signal generated from one of the first switching part and the second switching part.

The control unit is connected to the hood switch, the first switching unit, and the second switching unit to generate an operation signal according to the reverse switch signals from the hood switch and the first and second switching units; The operation switch may be disposed between the louver motor and the control unit to operate the louver motor according to the operation signal.

Hereinafter, the present invention will be described in detail with reference to the drawings.

Since the basic configuration of the microwave oven according to the present invention is the same as the microwave oven illustrated in FIG. 1, the features of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 2, the suction grill of the present microwave oven has a rectangular frame-shaped grill frame 26 installed on the front surface of the main body 3 and a plate shape rotatably installed in front of the grill frame 26. An inlet louver 25 and a louver driving device 20 for operating the inlet louver 25 are provided.

The louver drive device 20 includes a louver drive motor 30 provided at one side of the suction grill 27, a cam 35 provided on the shaft of the louver drive motor 30 and contacting the intake port louver 25. The first and second micro switches 36 and 37 are provided on one side of the cam 35 so as to be in contact with and spaced apart from the cam 35 to be turned on and off depending on the opening and closing state of the inlet louvers 25.

As shown in FIG. 3, the louver driving unit for driving the intake port louver 25 is turned on in conjunction with the louver relay 40 and the hood switch 51 to control the power supply to the louver driving motor 30. It is turned off and installed between the hood switching unit 50 for intermittent power supply to the louver relay 40 and the louver relay 40 and the hood switching unit 50 and turned on and off according to the rotation of the air intake louver 25. Louver relay in accordance with signals from the first and second switching sections 31 and 32 and the hood switching section 50 and the first and second switching sections 31 and 32 for intermittent power supply to the relay 40. And a control unit 10 for controlling the supply of driving power for driving the 40.

Louver relay 40 has a coil and a switch as in a general relay, one end of the switch is connected to the louver driving motor 30, the other end is connected to the power supply unit for supplying power from the outside is have. Therefore, when driving power is applied to the coil of the louver relay 40, the switch is turned on to supply power from the outside to the louver driving motor 30 to operate the louver driving motor 30.

The hood switching unit 50 is installed on the photo coupler 52 connected to the hood switch 51 and generating a signal when the hood switch 51 is turned on, and on a power line connected to the louver relay 40 to provide a louver. A drive switch 55 for intermitting the supply of drive power supplied to the relay 40, and installed between the photocoupler 52 and the drive switch 55 and turned on by a signal from the photocoupler 52, And a power supply switch 53 for intermittent driving power for driving 55. On the power line connecting the power supply switch 53 and the drive switch 55, a condenser 54 is connected in parallel, and the condenser 54 smoothes and smoothes the drive power supplied by the power supply switch 53. The drive power is supplied to the drive switch 55. The driving switch 55 is turned on by the driving power to connect the power line so that current can flow to the power line extending from the louver relay 40. Here, the power supply switch 53 is a pnp type transistor, and the drive switch 55 is formed of an npn type transistor.

On the other hand, the hood switch 51 is connected between the light emitting diode of the photocoupler 52 and the hood fan motor 56 for driving the hood fan 13. Accordingly, since power is supplied to the hood fan motor 56 in association with the turn-on of the hood switch 51, the hood fan 13 is operated when the hood switch 51 is turned on.

The first switching unit 31 is connected to the first microswitch 36 and the first microswitch 36 which are turned on and off in response to the operation of the cam 35 when the inlet louver 25 is opened and closed. The first transistor 41 is included. The second switching unit 32 is connected in parallel with the first microswitch 36 and in conjunction with the second microswitch 37 and the second microswitch 37 which are turned on and off according to the operation of the cam 35. And a second transistor 42 that is turned on and off and connected in parallel with the first transistor 41. The first transistor 41 and the second transistor 42 are both formed of npn transistors to be turned on and off under the same conditions. In other words, the first micro switch 36 and the second micro switch 37 are connected in parallel, and the first transistor 41 and the second transistor 42 are parallel to the power line from the louver relay 40. It is connected. Accordingly, even when only one of the first switching unit 31 and the second switching unit 32 is turned on, the driving power is supplied from the hood switching unit 50 to the louver relay 40.

On the other hand, since the first micro switch 36 and the second micro switch 37 are turned on and off according to the rotational position of the cam 35, the first micro switch 36 and the second micro switch 37 are turned on and off. It may be determined whether the air intake louver 25 is opened or closed depending on the state. When both of the first and second micro switches 36 and 37 are turned off, the inlet louver 25 is in an open state. At this time, the first and second transistors 41 and 42 are turned off and the louver relay 40 is turned off. The drive power supply to the furnace is cut off. When one of the first microswitch 36 and the second microswitch 37 is turned on and the other is turned off, the inlet louver 25 is in the closed state or is in the middle of being opened or closed. In this case, since power is supplied to one of the first transistor 41 and the second transistor 42, the driving power supply to the louver relay 40 is allowed.

In the louver driver, the power line from the first micro switch 36, the power line from the second micro switch 37, and the power line from the base end of the power supply switch 53 are all provided to the controller 10. It is electrically connected. Therefore, the control unit 10 according to the on and off of the first and second micro switches 36 and 37 and the on and off of the power supply switch 53, the operating state of the inlet louver 25 and the hood switch 51 It is possible to determine whether to turn on.

On the other hand, the power supply line extending from the control unit 10 is connected to the power supply line on the input side of the louver relay 40, and the power supply line extending from the control unit 10 is turned on and off according to a signal from the control unit 10. The operation switch 33 is provided. When the louver operation switch 33 is turned on, the driving power is supplied to the louver relay 40 so that the louver relay 40 is turned on. The louver operation switch 33 is formed of an npn type transistor.

The microwave oven according to this configuration is normally closed by the intake port louver 25, and automatically opens when cooking food in the microwave, or manually when cooking food in the microwave. When the temperature in the hood duct 15 rises more than a certain amount, it is automatically opened.

When food is cooked with a gas stove in a state where the inlet is closed, moisture and smoke are generated. When the temperature in the hood duct 15 rises by a certain amount due to moisture and smoke, the hood switch 51 is turned on. The power is supplied to the hood fan motor 56 and the photo coupler 52.

Then, the control unit 10 determines the turn-on of the hood switch 51 by the signal from the hood switch 51, and intake louvers 25 in accordance with the signals from the first and second micro switches 36 and 37. It will detect the open / closed state of. When one of the first and second micro switches 36 and 37 is turned on, the control unit 10 determines that the intake port louvers 25 are in a closed state or not fully open, and the louver operation switch 33 The intake port louvers 25 are opened by supplying power to the turn-on and supplying driving power to the louver relay 40. On the other hand, when both of the first and second micro switches 36 and 37 are turned off, it is determined that the air intake louver 25 is in an open state, and the driving power is not supplied to the louver operation switch 33.

Intake louver First microswitch 2nd micro switch Open open closed closed 0010 0101

TABLE 1

Table 1 is a table showing the correlation between the on and off of the first and second micro switches 36 and 37 and the open / closed state of the air intake louvers 25.

As such, when the controller 10 is operating normally, the louver operation switch (10) is turned on by the controller 10 according to whether the hood switch 51 is turned on and whether the first and second micro switches 36 and 37 are turned on or off. By controlling the driving power supply to 33, the operation of the air intake louver 25 is controlled.

On the other hand, when the control unit 10 does not operate normally, the operation of the inlet louver 25 is mechanically controlled through the following process. When the hood switch 51 is turned on to supply power to the hood fan motor 56 and the photo coupler 52, the hood fan 13 is operated, and the electrical signal of the photo coupler 52 is supplied to the power supply switch 53. The power supply switch 53 is turned on. When the power supply switch 53 is turned on, the driving power supplied through the power supply switch 53 is smoothed in the condenser 54 and then turns on the driving switch 55.

When the driving switch 55 is turned on in this way, the driving power is supplied to the louver relay 40 according to the on / off state of the first micro switch 36 and the second micro switch 37, that is, the opening / closing state of the inlet louver 25. Is supplied. At this time, when the inlet louver 25 is in an open state, both the first micro switch 36 and the second micro switch 37 are turned off. At this time, the driving power is not supplied to the louver relay 40. Then, when the inlet louver 25 is closed, or is being opened or in the middle of closing, one of the first microswitch 36 and the second microswitch 37 is turned on, and the driving power is supplied to the louver relay 40 at this time. Thus, the inlet port louver 25 is opened.

As described above, in the present invention, the first and second transistors 41 and 42 and the hood switch 51 are turned on and off according to the open state of the inlet louver 25 on the power line connected to the louver relay 40. The drive switch 55 which is turned on and off by this is sequentially configured. When the inlet louver 25 is not in an open state, at least one of the first and second micro switches 36 and 37 is turned on, so that the driving power is turned on when the hood switch 51 is turned on. 40).

On the other hand, Figure 4 shows a louver driving circuit according to another embodiment of the present invention. As shown in FIG. 4, the pin P2 of the controller 110 is connected to the base end of the louver operation switch 33 for operating the louver relay 40. The hood switching unit 150 including the hood switch 51 is connected to the pin P1 of the control unit 110 to receive an output from the hood switching unit 150. The hood switching unit 150 is connected to the hood fan motor driver 160 under the control of the control unit 110 and the power source. In addition, the first and second switching units 136 and 137 having the first and second micro switches 36 and 37, respectively, include the pin P3 of the controller 110 and one input terminal 220A of the OR gate 220. And the pin P4 of the controller 110 and the other input terminal 220B of the OR gate 220, respectively. The output 220C of the OR gate 220 is connected to the input terminal 210A of the AND gate 210 to drive the drive switch 55 coupled to the coil of the louver relay 40. In addition, the hood switching unit 150 is connected to another input terminal 210B of the AND gate 210, and according to the output of the hood switching unit 150 and the first and second switching units 136 and 137, the louver relay 40 is provided. ) Is operated to operate the louver motor 30. That is, when the hood switching unit 150 is operated and one of the first switching unit 136 and the second switching unit 137 is operated, the louver relay 40 is operated to operate the louver motor 30. do.

Accordingly, in the present invention, even when the control unit 10 does not operate normally, if the hood switch 51 is turned on, the intake port louver 25 can be opened. Therefore, due to the operation of the hood fan 13 when the hood switch 51 is turned on, moisture and smoke are discharged and indoor air is also sucked through the suction grill 27 to be discharged to the outside. Accordingly, even when the control unit 10 does not operate normally, when the hood switch 51 is turned on and the hood fan 13 operates, the air intake louver 25 can be opened, so that the exhaust air is smoothed and the hood fan motor ( The load of 56) can be prevented.

As described above, according to the present invention, the louver is opened and closed in conjunction with the operation of the hood switch regardless of the normal operation of the control unit.

Claims (18)

A main body having a front inlet, a hood inlet, and a hood outlet; An electron installed in the main body and having a hood fan for discharging air introduced through the inlet and the hood inlet through the hood outlet, an inlet louver for opening and closing the inlet, and a louver driving motor for opening and closing the inlet louver In the stove, A hood switch turned on above a predetermined temperature to supply power to the hood fan to operate the hood fan; And a louver driver for supplying power to the louver driving motor so that the intake louver is opened in association with the turn-on of the hood switch. The method of claim 1, A micro switch connected to the intake louver to generate a microswitching signal; And the driving circuit is connected between the hood switch and the micro switch and operates the louver driving motor in response to the hood switching signal and the micro switching signal. The method of claim 1, And a first switching unit coupled between the louver driving motor and the driving circuit and connecting the driving circuit to the louver driving motor when the louver is not open. The method of claim 3, wherein The drive circuit, A drive switch connected to the louver driving motor for supplying power to the louver driving motor; And a power supply switch for driving the driving switch when the hood switch is turned on. The method of claim 2, The first switching unit has a first micro switch turned on and off according to opening and closing of the inlet louver, and a first transistor on and off connected to the first micro switch and connected to the driving switch; And the second switching unit has a second micro switch connected in parallel with the first micro switch, and a second transistor connected in parallel with the first transistor. The method of claim 5, And the first and second switching units are connected in parallel with the louver driving motor and the driving circuit. In the microwave, A cavity for cooking food, a grill member connected to the cavity to form a first air passage, a hood duct forming a second air passage, a hood fan disposed in the hood duct, and a hood motor coupled to the hood fan A main body comprising; A louver mounted to the grill member to open and close the first air passage; A louver motor for driving the louver; A hood switch connected to the hood motor to move the hood motor to generate the hood switching signal; And a driving circuit connected between the louver motor and the hood switch to move the louver motor in response to the hood switching signal. The method of claim 7, wherein And a louver switch unit disposed between the driving circuit and the louver motor to connect the driving circuit to the louver motor. The method of claim 8, The louver switch unit, A louver switch connected to the louver and generating a louver switching signal indicating any one of an open and a closed state of the louver; And a driver connected to the louver switch and disposed between the driving circuit and the louver motor and connecting the driving circuit and the louver motor in response to the louver switching signal. The method of claim 9, And the louver motor is operated according to the hood switching signal and the louver switching signal to open the louver. The method of claim 8, And the driving circuit and the louver switch circuit are connected in series with the louver motor. The method of claim 8, A control unit coupled to the hood switch and the louver switch unit to generate an operation signal in response to the hood switch and the louver switch unit; And an operation switch disposed between the louver motor and the control unit to operate the louver motor in response to the operation signal. The method of claim 12, And the driving circuit and the operation switch are connected in parallel with the louver. The method of claim 7, wherein And the first air passage and the second air passage communicate with each other in the hood pan area. The method of claim 7, wherein The microwave oven further comprises a first switching unit and a second switching unit connected in parallel to the driving circuit. The method of claim 15, The first switching unit and the second switching unit, A microswitch connected to the louver and operating according to a closed state, during opening and closing; And a driver connected to the micro switch and disposed between the driving circuit and the louver motor and connecting the louver motor to the driving circuit according to the louver switching signal. The method of claim 16, And the louver motor is operated to open the louver according to the hood switching signal and the louver switching signal generated from one of the first switching part and the second switching part. The method of claim 16, The control unit is connected to the hood switch, the first switching unit, and the second switching unit to generate an operation signal according to the reverse switch signals from the hood switch and the first and second switching units; And the operation switch is disposed between the louver motor and the control unit to operate the louver motor according to the operation signal.