KR950014027B1 - Electronic range - Google Patents

Abstract

No content.

Description

Cooker

1 to 5 show a first embodiment of the present invention.

1 is an electrical diagram.

2nd time chart.

3 is a full partial cross-sectional view.

4 is a full longitudinal cross-sectional view.

5 is an exploded perspective view of the damper and around the motor.

6 to 17 show a second embodiment of the present invention.

6 is a view of the whole front view with the door open.

7 is a cross-sectional view of a part of a machine room.

8 is a perspective view of a damper.

9 is an enlarged view of an essential part showing a state before caulking the damper shaft.

10 is an enlarged view of an essential part showing a state after caulking the damper shaft.

11 is an exploded perspective view of the damper and surrounding the duct.

12 is an exploded perspective view of the damper drive device.

13 is a partial top view showing a state in which the damper is in the open position.

14 is a partial top view showing a state in which the damper is in the closed position.

15A and 15B are top views showing cams and micro switches, and time charts showing changes in output signals of the micro switches.

16 is an electric circuit diagram.

Figure 17 is a time chart.

18 and 19 show a conventional configuration

18 is equivalent to FIG.

19 is a circuit diagram showing another state for explaining the operation.

20 is a diagram corresponding to FIG. 14 showing another conventional configuration.

* Explanation of symbols for main parts of the drawings

17: microcomputer 19, 45: vent hole

20, 56: duct 21: damper

22, 25: magnetron 23: damper shaft

24: micro switch 26: motor

27: drive shaft 33, 47: machine room

54: cooling fan

The present invention relates to a heating cooker comprising a high frequency oscillator for heating a food in a heating cooking chamber at a high frequency and a heater for heating the food.

In this type of heat cooker, a damper for controlling the supply of external air into the heat cooker is rotatably provided, and the damper is opened and closed by a motor.

In this configuration, the damper is opened to supply the outside air to the heating cooking chamber during high frequency heating, while the damper is closed to supply the outside air to the heating cooking chamber when the heater is heated.

Examples of such a configuration are shown in FIGS. 18 and 19.

In this FIG. 18, the motor 1 which opens and closes a damper through a crank mechanism (not shown) is connected between the power bus 3 and the power bus 4 which flowed out from the AC power supply 2. As shown in FIG.

The microswitches 5 and 6 and the relay switch 7 are connected between the motor 1 and the power supply bus 4 as shown. Here, the micro switch 5 is turned off when the damper is in the closed state and turned on when the damper is in the open state. The micro switch 6 turns on when the damper is in the closed state and turns off when the damper is in the open state.

The relay switch 7 is configured such that the switching between the contact c-a and the contact c-b is controlled by the control circuit 8. However, in the above configuration, the damper is opened in the closed state (the state shown in FIG. 18), but as shown in FIG. 19A, the contact between the contacts c-b of the relay switch 7 is turned on.

Accordingly, the motor 1 is energized so that the damper rotates through the crank mechanism. When the damper is rotated to the open position, as shown in Fig. 19B, the microswitch 6 is turned off to disconnect the motor 1 and the damper is kept in the open state.

Next, to close the damper, the contact c-a of the relay switch 7 is turned on as shown in FIG. 19C. Accordingly, the motor 1 is energized and the damper rotates in the closing direction through the crank mechanism.

When the damper is rotated to the closed position, as shown in FIG. 19D, the microswitch 5 is turned off so that the motor 1 is disconnected and the damper is kept in the closed state.

In the above conventional configuration, two cams are attached to the drive shaft of the motor 1 as a mechanism for operating the two microswitches 5 and 6 in order to energize the motor in accordance with the closing of the damper. For this reason, there is a drawback that the number of parts becomes large and the configuration becomes complicated.

If the adjustment of at least one of the two microswitches 5 and 6 is poor, the microswitches may not operate normally, and the motor 1 may continue to be energized, causing the damper to repeat the opening and closing operation.

In this case, when the heater is heated, since the outside air is supplied to the cooking chamber, the heat in the cooking chamber leaks out, and thus the temperature in the cooking chamber does not become high, so that normal cooking cannot be performed.

An object of the present invention is to provide a heating cooker which can simplify the configuration and at the same time reduce the number of adjustment points and can reliably open and close the damper.

The heating cooker of the present invention includes a high frequency oscillator for heating the food in the heating cooking chamber at high frequency, a heater for heating the food described above, a damper installed rotatably to control the supply of outside air to the heating cooking chamber, and A heating cooker comprising a motor for opening and closing the damper, wherein the above-described motor is controlled based on the position detecting means for detecting the opening and closing position of the damper and the position detecting signal output from the position detecting means. It characterized in that the control means for installing.

In the modified embodiment of the present invention, abnormality detecting means for detecting an abnormality of opening and closing of the damper based on the position detecting signal output from the position detecting means, and a high frequency oscillator and heater when the abnormality of opening and closing of the damper is detected by the abnormality detecting means. Heating control means for stopping the driving of the damper and an alarm means for informing an abnormality when the above-described abnormality of opening and closing of the damper is detected by the above-described abnormality detecting means.

In this case, the abnormality detecting means indicates the open state in the position detecting means when the damper is driven in the closing direction when the position detecting signal indicating the closed state is continuously output from the position detecting means when the damper is driven in the open direction. When the position detection signal is continuously output or when the position detection signal indicating the closed state and the position detection signal indicating the open state are repeatedly outputted by the position detection means when the damper is driven in the open or closed direction, The alarm means may be constituted by a buzzer or a display device to detect abnormality of opening and closing of the damper.

In another modification of the present invention, the control means is configured to set the position of the damper to the initial position by rotating the damper when the power is turned on.

Moreover, in another modification of this invention, a position detection means is comprised by the cam rotated by a motor and linked with the opening-closing operation of a damper, and the micro switch turned on and off by this cam.

In another modification of the present invention, there is provided an opening that is opened and closed by a damper provided on the wall of the heating cooking chamber, and is installed to guide the outside air to the opening so that the damper is rotatably supported through the damper shaft. And a tension coil spring installed between the damper and the wall of the heating cooking chamber to add the damper in the closing direction, and the long groove supporting the damper shaft is provided in the duct. It is formed to follow the direction of action of the tension coil spring force.

In another modified aspect of the present invention, there is provided a duct having an opening and closing opening by a damper provided on a wall of a heating cooking chamber, the opening being guided through the damper shaft so as to guide the outside air. The damper is provided with a positioning portion for positioning the above-mentioned damper shaft and a caulking fixing portion for caulking and fixing the above-mentioned damper shaft.

Hereinafter, the present invention will be described with reference to FIGS. 1 to 5 based on the first embodiment in which the present invention is applied to an oven grill stove.

First, the heating cooking chamber 12 is provided in the stove main body 11 in FIG.3 and FIG.4. In the front part of the stove main body 11, the door 13 is provided so that the front opening part of the heating cooking chamber 12 may be opened and closed.

In the machine chamber 33 on the right side of the heating cooking chamber 12 in the stove main body 11, a cooling fan 14 is provided in the rear part, and the printed wiring board 15 is provided in the front part. The printed wiring board 15 is, for example, attached with electronic components such as a DC drive relay 16 and a microcomputer 17 (see FIG. 1). This microcomputer 17 stores an operation control program and has respective functions of control means, heating control means and abnormality detecting means.

In the partition wall 18, which is the right wall of the heating cooking chamber 12, for example, a vent hole 19 is formed as an opening and a duct 20 is attached thereto. The outside air blown by the cooling fan 14 is guided by the duct 20 to be supplied into the heating cooking chamber 12 through the vent hole 19. The vent 19 is opened and closed by a damper 21 to be described later.

In the machine room 33, for example, a magnetron 22 is disposed between the cooling fan 14 and the duct 20 as a high frequency oscillator for high frequency heating of food contained in the heating cooking chamber 12. In the heating cooking chamber 12, a heater (not shown) for heating the food is provided. And the damper 21 is demonstrated with reference to FIG.

In FIG. 5, the damper 21 is substantially rectangular, and the damper shaft 23 is spot-welded along the left end part, for example. The damper shaft 23 is inserted into the through hole formed in the protruding piece 21a bent at the lower left end of the damper 21, and the engaging portion 23a bent at right angles to the upper end of the damper 21 at the upper left end. It engages with the engagement recessed part 21c formed in the curved protrusion piece 21b. The damper shaft 23 is rotatably supported by a bearing portion (not shown) provided with a partition wall 18 of the heating cooking chamber 12.

Accordingly, the damper 21 is rotatably provided. A coil spring 24 is fitted between the engaging piece 21d bent on the protruding piece 21b of the damper 21 and the partition wall 18 of the heating cooking chamber 12, and the coil spring ( The damper 21 always exerts a force in the direction in which the vent hole 19 is closed by 24. On the other hand, the motor mounting plate 25 is attached to the partition wall 18 of the heating cooking chamber 12 in the lower part of the duct 20, and is attached.

The motor 26 is attached to the lower surface of this motor mounting plate 25. The motor 26 incorporates a reduction gear, protrudes the drive shaft 27 upward through the motor mounting plate 28, and attaches a cam 28 which is almost disk-shaped to the drive shaft 27.

The cam peak 28a is provided in the half circumference part of the outer periphery of this cam 28. As shown in FIG. A pin 28b protrudes from the upper circumferential edge portion 28a of the cam 28, and the pin 28b spans the lever portion 23b bent at a right angle to the lower end of the damper shaft 23 described above. .

In this case, as the motor 26 is energized, the rotational movement of the cam 28 is converted into the reciprocating rotational movement of the lever portion 23b, and the damper shaft 23 and the damper by the reciprocating rotational movement of the lever portion 23b. 21 is rotated forward and backward to open and close the vent hole 19.

Here, the microswitch 29 is attached to the upper surface of the motor mounting plate 25. This microswitch 29 is turned on when the operator is suppressed by the cam mount 28a of the cam 28.

Position detecting means are configured in the micro switch 29 and the cam 28. In addition, in Fig. 1 showing the electrical configuration, a series circuit constituted by the relay switch 16a of the motor 26 and the relay 16 between the power bus 31 and the power bus 32 derived from the AC power supply 30. Is connected.

The relay switch 16a of the relay 16 is controlled on and off by the microcomputer 17. The microcomputer 17 is also provided with a switch signal output from the microswitch 29.

Next, the operation of the configuration will be described with reference to FIG.

In this case, it is set so that the damper 21 will be in the closed state in the state which cooking is not performed.

First, the case where the food in the heating cooking chamber 12 is heated by the magnetron 22 at high frequency, that is, when the damper 21 is opened, will be described. In this case, since the damper 21 is closed at the time of stop, the micro switch 29 is turned off, and the switch signal output from the micro switch 29 is at a low level.

In this state, as shown in FIG. 2, when the relay switch 16a is turned on at the time t1 after 0.1 second has elapsed from the start of the aperture, the motor 26 is energized and the cam 28 rotates. Accordingly, the rotational movement of the cam 28 is converted into the reciprocating rotational movement of the lever portion 23b of the damper shaft 23, and the damper shaft 23, that is, the damper 21, rotates in the right rotational direction during the third and fifth directions. do. Then, after the damper 21 reaches the open position (at time t2), the cam mount 28a of the cam 28 suppresses the microswitch 29 and turns it on.

At this time, the microcomputer 17 receives the high level switch signal output from the microswitch 29 and turns off the relay switch 16a to disconnect the motor 26. The motor 26 is kept in the disconnected state and the damper 21 is kept open by the reduction gear against the bias force of the coil spring 24. The time t1 and t2 are about 3 seconds long.

In the open state of the damper 21, the food contained in the heating cooking chamber 12 by the magnetron 22 is heated at high frequency, and the blowing air from the cooling fan 14 is supplied into the heating cooking chamber 12 through the vent hole 19. do. After the cooking is finished at time t3, the damper 21 is closed.

In this case, as shown in FIG. 2, when the relay switch 16a is turned on at time t3, the motor 26 is energized and the cam 28 rotates.

Accordingly, the rotational movement of the cam 28 is converted to the reciprocating movement of the lever portion 23b of the damper shaft 23, and the damper shaft 23, i.e., the damper 21 is rotated counterclockwise in the third and fifth directions. . After the damper 21 reaches the closed position (at time t4), the cam mount 28a of the cam 28 does not suppress the microswitch 29 and turns off the microswitch 29.

At this time, the microcomputer 17 receives the low level switch signal output from the microswitch 29 and turns off the relay switch 16a to cut off the motor 26. As a result, the vent hole 19 is closed by the damper 21.

The time t3 and time t4 are also about 3 seconds. On the other hand, when the heater heats food contained in the heating cooking chamber 12 by the heater, cooking is performed with the damper 21 closed. That is, since the damper 21 remains closed, the outside air is not blocked by the damper 21 and is not supplied into the heating cooking chamber 12. As a result, the heat in the cooking chamber 12 is prevented from leaking to the machine chamber 33 side.

However, when the opening and closing operation of the damper 21 is abnormal, for example, when the relay 16 fails and the motor 26 is continuously energized, the damper 21 repeats the opening and closing operation. In this case, the switch signal output from the micro switch 29 is repeatedly changed at regular intervals from low level to high level and high level to low level. That is, the position detection signal indicating the open state and the position detection signal indicating the open state are repeatedly output from the micro switch 29.

In response to the above-described change, the microcomputer 17 detects an abnormality in opening and closing of the damper 21, stops the driving of the magnetron 22 and the heater, and at the same time plays a buzzer (not shown) as an alarm means.

As an abnormal opening / closing operation of the damper 21 other than the case described above, when the damper 21 is driven in the open direction, when the low level switch signal, which is a position detection signal indicating the open / closed state, is continuously output from the microswitch 29 ( For example, detection is performed for 1 minute, or when the high level switch, which is a position detection signal indicating an open state in the microswitch 29 when the damper 21 is driven in the closing direction (for example, 1 minute) In this case, the microcomputer 17 detects an abnormality in opening and closing of the damper 21, stops the operation of the magnetron 22 and the heater, and simultaneously acts as an alarm means, for example, buzzer. have.

According to this embodiment of such a configuration, the open / close position of the damper 21 is detected by the micro switch 29, and the energization control of the motor 26 is performed based on the switch signal output from the micro switch 29. FIG. The damper 21 is configured to open and close, so that only one microswitch 29 is provided and compared with the conventional configuration (see FIG. 12) in which two microswitches 5 and 6 are provided. The configuration can be simplified by reducing the number of parts.

In addition, since only one micro switch 29 is adjusted and the number of adjustment points is reduced as compared with the conventional configuration, the chance of misalignment can be reduced, and the damper 21 can be reliably opened and closed.

In addition, when the opening / closing abnormality of the damper 21 is detected, the magnetron 22 and the heater drive are stopped. Therefore, the heating is not performed in a state where the damper 21 is abnormally opened or closed.

Accordingly, when the heater is heated, it is possible to prevent the heat in the heating cooking chamber 12 from leaking out to the machine room 33 side, and to cook in a state in which the temperature in the heating cooking chamber 12 is not sufficiently high, that is, strange cooking is performed. Can be surely prevented.

In addition, when the damper 21 detects an abnormality in opening and closing, the buzzer is operated to notify the abnormality. Therefore, the user can easily recognize the abnormal operation of the damper 21, so that countermeasures such as repair can be performed quickly. have.

In the above embodiment, a buzzer is used as an alarm means. However, a display device made of a light emitting diode or the like may be used to display an abnormality on the display device.

A second embodiment of the present invention will be described with reference to FIGS. 6 to 17.

First, the heating cooking chamber 42 is provided in the stove main body 41 in FIG. In the front part of the stove main body 41, the door 43 is provided so that the front opening part of the heating cooking chamber 42 may be opened and closed.

The grill cooking heater 44 is provided in the ceiling of the heating cooking chamber 42. The back of the heating cooking chamber 42 is provided with a fan for hot air circulation, not shown, by which the air in the heating cooking chamber 42 is sucked through the vent hole 45 and the heating cooking chamber 42 through the discharge hole. It is supposed to go back inside and circulate.

Moreover, the machine room 47 is provided in the right side of the cooking chamber 42 in the stove main body 41 as shown in FIG. An opening 49 is formed in an upper front portion of the partition wall 48, for example, the right side wall of the heating cooking chamber 42.

The partition wall 48 fills the heat insulating agent 52 between two heat insulating plates 50 and 51. In addition, the ventilation hole 53 which consists of many punching holes is provided in the site | part corresponding to the opening part 49 of the heat insulation board 50 of the heating cooking chamber 42 side.

In the machine room 47, a cooling fan 54 is provided at the rear portion, and a magnetron 55 is provided between the cooling fan 54 and the opening 49. As shown in FIG. A duct 56 for guiding outside air into the opening 49 is provided over the opening 49 at the side surfaces of the cooling fan 54 and the magnetron 55. The outside air blown by the cooling fan 54 is guided by the duct 56 to be supplied into the heating cooking chamber 42 through the vent hole 53.

The exhaust gas in the heating cooking chamber 42 is discharged through the exhaust hole 57 provided in the upper left wall of the heating cooking chamber 42. Moreover, the opening amount of the said opening part 49 is adjusted by the damper 58. FIG. As shown in FIG. 8, this damper 58 is formed in a rectangular shape as a whole by press working of a metal plate, and a hole 58d (shown only one side) through which a damper shaft is fitted is provided on the upper and lower surfaces thereof. The damper shaft 59 is inserted into the hole 58d through which the hole is inserted.

The damper shaft 59 has a lower end portion projecting downward from the lower end of the damper 58, and the upper end portion is bent in a crank shape (two times at substantially right angles) so that the engaging portion 59a protrudes upward.

Moreover, the positioning part 58a is integrally formed in the upper end surface of the damper 58, and the spring latch part 58b is formed in the upper part of this positioning part 58a. In this case, the positioning portion 58a positions the horizontal portion 59b of the damper shaft 59.

Moreover, the coking part 58c is integrally formed in the upper end surface left end part of the damper 58 toward the upper side.

Then, the coking portion 58c is bent in the direction of the arrow P in the ninth direction to fix the coking, so that the damper shaft 59 is fitted to the coking portion 58c and the positioning portion 58a as shown in FIG. It is fixed.

Meanwhile, as shown in FIG. 11, cutouts 56a and 56b are formed in an inclined direction at portions corresponding to the damper shaft 59 among the plate portions extending in the transverse direction from the upper end and the lower end of the duct 56. have.

The damper shaft 58 is rotatably supported by the duct 56 by inserting the damper shaft 59 into the notches 56a and 56b. A tension coil screen 60 is attached between the spring catching portion 50a formed at the upper end of the heat insulating plate 50 and the spring catching portion 58b of the damper 58. The damper 58 is biased by the tension coil screed 60 in the direction of closing the opening 49.

In this case, as shown in FIG. 13 and FIG. 14, the notch grooves 56a and 56b are set to follow the direction in which the force of the tension coil screen 60 acts.

Next, the drive device 61 for rotating the damper 58 in the opening direction will be described with reference to FIG.

The motor mounting plate 63 is located above the duct 56 and attached to the ceiling plate 62 of the heating cooking chamber 42. The motor 64 is attached to the lower surface of this motor mounting plate 63. The motor 64 incorporates a reduction gear, and attaches a substantially disk-shaped cam 65 to the drive shaft 64a which has penetrated the drive shaft 64a through the motor mounting plate 63 and protrudes upward.

The cam peak 65a is provided in the substantially half circumferential part of the outer circumference of the cam 65. A pin 66 protrudes from the upper circumferential edge of the cam 65, and the long hole 67a formed at one end of the lever 67 is fitted to the pin 66.

The lever 67 is rotatably attached to the motor mounting plate 63 by a screw 68. The locking recess 67b formed at the other end of the lever 67 is configured to be able to engage the locking portion 59a of the damper shaft 59.

In this case, as the electric motor 64 is energized, the rotational movement of the cam 65 is converted into the forward and backward movement of the lever 67, and the damper shaft 59 and further the damper 58 by the forward and reverse rotation of the lever 67. Is reversed to open and close the opening 49, i.e., the vent hole 53, as shown in Figs.

Here, the micro switch 69 is attached to the cam 65 on the upper surface of the motor mounting plate 63. Position detecting means is formed in the microswitch 69 and the cam 65. As shown in Figs. 15A and 15B, the microswitch 69 is turned on when the cam switch 65a is suppressed to output a high level signal.

In FIG. 16, which shows the electrical configuration, the power buses 71 and 72 protrude from the commercial AC power source 70. In FIG. The power buses 71 and 72 have a primary winding 73a of the high voltage transformer 73, a heater 74, a lamp in the ceiling 75, a door switch 6, a short switch 77 and a relay switch 78. -80 is connected as shown. The magnetron 55 and the rectifier circuit 81 are connected to the secondary winding 73b side of the high voltage transformer 3.

On the other hand, the motor 64 and the relay switch 82 are connected to the power buses 71 and 72 in series, and at the same time, the primary winding 84a of the transformer 84 for applying a voltage to the control means 83. ) Is connected. The control means 83 comprises a rectifier circuit, a microcomputer, etc., and the secondary winding 84b of the transformer 84 is connected.

The control means 83 is provided with a switch signal at the micro switch 69 and at the same time, each switch signal at the operation unit 85 having various operation switches (not shown). The control means 83 drives the display unit 86 while controlling the relay switches 78-80 and 82 on / off in accordance with a control program stored therein.

Next, the operation of the configuration will be described with reference to FIG.

In the above configuration, when the power is turned on, the damper 58 is rotated and is set at the initial position, for example, the closed position.

This initial positioning operation is described below.

When the power is turned on at time t1 in FIG. 17, that is, when a power plug (not shown) is inserted into the outlet, the relay switch 82 is turned on first and the motor 64 is energized. Accordingly, the cam 65 is driven to rotate.

Here, if the micro switch 69 is suppressed by the cam mount portion 65a of the cam 65 when energization is applied, the high level signal is applied to the control means 83 in the micro switch 69.

13, the cam 65 rotates in the direction of the arrow c in FIGS. 13 to 15, for example, and the damper 58 reaches the open position at the time t2 shown in FIG. Likewise, the micro switch 69 is not suppressed by the cam mount 65a and the low level signal is output from the micro switch 69.

Subsequently, when the cam 65 is further rotated in the direction of the arrow c, the damper 58 is rotated in the closing direction through the pin 66, the lever 67, the damper shaft 59, and the like by the rotation thereof.

When the damper 58 is rotated to the closed position at the time t3 shown in FIG. 17, the micro switch 69 is again suppressed by the cam mount 65a as shown in FIG. Will output a high level signal. By detecting the start of this high level signal, the relay switch 82 is turned off and the motor 64 is cut off. Accordingly, the damper 58 is set in the closed position.

According to this second embodiment, the position of the damper 58 is set to the initial position, for example, the closed position when the power is turned on. For this reason, the closing control of the damper 58 can be performed easily at the time of a heating operation after that. In the case of high frequency heating, the damper 58 is opened to blow outside air into the cooking chamber 42, while the heater closes the damper 58 so that the heat in the cooking chamber 42 leaks to the machine chamber 47 side. You can prevent it from coming out.

By the way, in the conventional microwave oven, when the assembly was completed, the position of the damper was not determined, and the position of the damper at the time of shipment of the product was random. For this reason, the tension coil screw which adds a damper to the closing direction may be shipped by the product in the extended state, and the force of this spring may become weak, and a malfunction may occur.

On the other hand, according to the second embodiment, only the operation of turning on the power at the final stage of assembly is added and the damper 58 can be set in the closed position, so that the tension coil screen 60 is contracted for all products. Can be shipped as

Therefore, it is possible to reliably prevent the occurrence of a failure in the opening and closing operation of the damper 58. In the second embodiment, since the damper shaft 59 can be positioned by the positioning unit 58a formed in the damper 58, the jig for damper shaft positioning becomes unnecessary and the positioning is performed. The work can be performed very easily.

Moreover, since the damper shaft 59 is caulked and fixed by the caulking portion 58c formed in the damper 58, the cost of equipment can be reduced without the need for an expensive spot welder compared to the case of spot welding. have.

As described above, the operation from the positioning to the fixing of the damper shaft 59 can be performed very easily, and the assembly efficiency can be significantly improved as compared with the conventional one, and the manufacturing cost can be generally reduced.

In addition, since there is no welded portion at the fixed position between the damper shaft 59 and the damper 58, the defect that the portion is corroded can be eliminated, and the quality can be improved. In the above embodiment, the spring engaging portion 58b is integrally formed on the upper portion of the positioning portion 58a, but these may be formed separately.

In addition, a plurality of caulking portions 58c may be formed, or the shape of the damper shaft 59 may be changed. On the other hand, Fig. 20 shows a conventional example of the damper attachment structure.

In FIG. 20, an opening not shown is formed in the heat insulating plate 92, which is a wall of the heating cooking chamber 91, and a duct 93 for inducing outside air is attached to the opening. The damper shaft 95 of the damper 94 is supported by being inserted into an elongated cutout 93a having a semicircular shape, for example, an inner part, which is a long hole formed in the duct 93.

Between the damper 94 and the heat insulating plate 92 of the heating cooking chamber 91, a tension coil screen 96 for applying the damper 94 in the closing direction is provided. The reason why the damper shaft 95 is supported by the notch 96a in the above conventional configuration is described below. The space | interval arises between the duct 93 and the heat insulation board 92 by the error of the angular deformation dimension by the difference of the thermal expansion coefficient of the duct 93 and the heat insulation board 92.

In such a case, the damper shaft 95 properly moves within the cutout 93a so that the damper 94 seals the opening of the heat insulating plate 92.

However, in the conventional configuration, since the direction in which the force of the tension coil spring 6 is applied and the direction of movement of the damper shaft 95 are different, the spring force is not effectively applied and the damper shaft 95 is not smoothly moved. I could. For this reason, the damper 94 is not closed properly, and the outside air may enter the cooking chamber 91 or the heat may leak out of the cooking chamber 91 so that the temperature in the cooking chamber 91 does not rise. There was also a problem that the loss of heat was large.

On the other hand, in the above-described second embodiment, as shown in FIG. 3, the cutouts 56a and 56b formed in the duct 56 to support the damper shaft 59 are tension coil screens 60. As shown in FIG. The direction in which the force acts coincides with the direction of movement of the duct shaft 59. For this reason, the spring force acts effectively, and the damper shaft 59 is moved smoothly. Therefore, even if the space | interval arises between the duct 56 and the heat insulation board 51, the damper 58 is closed enough.

Accordingly, it is possible to reliably prevent the outside air from entering the cooking chamber 42 or the heat from leaking out of the cooking chamber 42 to the outside, and to remove the temperature error in the cooking chamber 42. At the same time, heat loss can be reduced.

In addition, although the notches 56a and 56b were provided as long grooves in the above embodiment, long holes may be formed in this manner.

Claims (6)

Rotational movement installed to control the supply of outside air into the cooking chamber through a high frequency oscillator for heating the food in the cooking chamber at a high frequency, a heater for heating the food, and an opening in the wall of the cooking chamber constituting the cooking chamber. A heat cooker having a damper and a motor for opening and closing the damper, comprising: position detecting means for detecting an opening and closing position of the damper, and energizing the motor based on a position detecting signal output from the position detecting means; Control means for controlling, abnormality detecting means for detecting the opening and closing abnormality of the damper based on the position detecting signal output from the position detecting means, and high frequency oscillator and heater when the abnormality in opening and closing of the damper is detected by the abnormality detecting means. Heating control means for stopping the operation of the damper and the abnormality detecting means Heating cooker, characterized in that it is composed of notifying means for notifying an abnormality when the paper. The position detection signal according to claim 1, wherein the position detection signal indicating the closed state is continuously output from the position detection means when the damper is driven in the open direction, or the position indicating the open state from the position detection means when the damper is driven in the closed direction. When the detection signal is continuously output, or when the position detection signal indicating the closed state and the position detection signal indicating the open state are repeatedly outputted from the position detection means when the damper is driven in the open or closed direction, Heating cooker characterized in that detecting the opening and closing abnormality. The heating cooker according to claim 1, wherein the control means is configured to set the position of the damper to the initial position by rotating the damper when the power is turned on. 2. The heating cooker according to claim 1, wherein the position detecting means comprises a cam which is driven by a motor and interlocks with the opening and closing operation of the damper, and a micro switch that is turned on and off by the cam. 2. The apparatus of claim 1, further comprising: a duct for introducing outside air into the heating cooking chamber, a damper shaft attached to the duct to suspend and support the damper in a rotatable manner, and a tension coil spring for adding the damper in the opening and closing direction. And a long groove is formed in the duct along a direction of action of the elastic force of the tension coil spring. The damper shaft of claim 1, further comprising: a duct for introducing outside air into the heating cooking chamber, a damper shaft attached to the duct to suspend and support the damper in a rotatable manner, and a positioning unit for positioning the damper shaft on the damper. A heating cooker, characterized in that a caulking portion for caulking the damper shaft is formed.