JPH0648541U - Door lock device for firing device - Google Patents

Abstract

(57) [Abstract] [Purpose] When the temperature inside the firing chamber becomes abnormally high, the doors open at abnormally high temperatures to prevent outside air from flowing into the chamber and increasing smoke and flames. Prevent. [Structure] A lock device 20 is provided above the door 12 of the baking chamber 7, and when the temperature inside the chamber detected by the thermistor 15 exceeds a preset value, the solenoid 24a is urged to lock the lock member 21.
To the front of the door 12 to prevent the door 12 from being opened accidentally.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a baking device for cooking.

[0002]

[Prior art]

 If the inside temperature of the baking oven becomes extremely high during cooking in the baking oven, the oils and fats of the food or the oils and fats accumulated in the soup saucer may burn and generate a large amount of smoke. Known safety devices in this case are those that detect such an abnormally high temperature in the firing chamber to turn off the heat source for heating, and those that detect the flame at the exhaust port and block the exhaust port with a shielding plate to extinguish the fire. It has been published (Jitsuko Sho 4-17495).

However, if a large amount of smoke is generated during cooking, even if there is a safety device that cuts off the heat source, the cook may open the door in an attempt to take out the food, and when the door is opened, outside air flows in. There is a risk that rapid combustion will occur, increasing smoke or flames.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to prevent the door from being opened when the inside of the firing chamber is abnormally hot, and to prevent the increase of smoke or flame due to the inflow of outside air.

[0005]

[Means for Solving the Problems]

 A first means for solving the above problems in the present invention is, as described in claim 1, provided with a door for loading and unloading food and a heat source for heating the food in a calcination chamber. A lock member for preventing the opening of the heating chamber, a temperature detector for detecting the temperature in the baking oven, and a lock control device for activating the lock member to the lock position when the temperature detector detects an abnormally high temperature. Is characterized by.

Further, as described in claim 2, the second means is a calciner provided with a door for loading and unloading the cooked food and a heat source for heating the cooked food in the calciner, and an abnormally high temperature inside the calciner. It is characterized by including a lock piece that is deformed by and locks the door.

The third means is characterized in that, in the first or second means, a soup saucer is integrally provided with the door, and the soup saucer is locked to lock the door.

[0008]

[Action]

 According to the first means, when the temperature inside the firing chamber becomes abnormally high, the lock control device is actuated to lock the door, preventing inadvertent opening of the door. Further, according to the second means, the door is locked by the lock piece that is thermally deformed due to the abnormally high temperature. Then, according to the third means, each of the lock members or lock pieces locks the door by locking the juice receiving tray.

[0009]

【Example】

 Hereinafter, embodiments will be described with reference to the drawings. 1 to 3 show a first embodiment, 1 is a calciner using a gas as a heat source, and an upper shell burner 3 and a pair of left and right lower shell burners 4 are provided in an outer shell 2 thereof, and An inner bottom 5 is attached. A firing chamber 7 is formed in a space surrounded by the upper fire burner 3, the inner bottom 5 and the side wall 6, a door opening 8 having an edge portion 8a is provided in a front portion thereof, and a rear upper surface of the outer shell 2 is provided. An exhaust port 9 that opens to the outside is provided.

The soup saucer 10 and the door 12 that opens and closes the door opening 8 are integrally fixed as in the conventional product, and the shelf 11 on which the food A is placed is also placed on the soup saucer 10. By pushing or pulling the 12 handles 12 a, the whole can be moved in and out of the baking chamber 7. Further, a fire transfer type pilot burner 13 is installed at the rear of the firing chamber 7, and the three flame openings thereof face the upper and lower burners 3, 4 and the thermocouple 14.

A thermistor 15 is provided in order to detect the temperature in the baking chamber 7. When the temperature of smoke or flame from the food A is high, the lock device 20 is activated by a lock control device (not shown). Door 12 is locked. The thermistor 15 may be attached at any appropriate position other than the position t ₁ shown in the drawing, such as a position t ₂ or t ₃ in the exhaust passage, a rear position t ₄ of the juice receiving tray, or the like.

The lock device 20 is provided on the frame 16 in the front part of the outer shell 2, and a lock member 21 that engages and disengages with the door 12 is pivotally supported by a support shaft 22 and a front end thereof is elastically moved by a spring 23 in an opening direction. The iron core 24a of the electromagnet 24 is fixed to the rear end, and the solenoid 24b is fixed to the frame 16 at the rear end. In the state shown in the figure, the lock member 21 is pulled up by the spring 23 and disengaged from the door 12, but when the solenoid 24b is urged, the tip of the lock member 21 lowers to lock the door 12 and open the door. become unable.

FIG. 2 shows a lock control device 25 of the lock device 20 and an electromagnetic valve control device 26 of the burners 3 and 4. The lock control device 25 includes a comparison circuit 28 that compares the temperature detected by the thermistor 15 with a reference value 27, a solenoid drive circuit 29 that amplifies the output of the comparison circuit, and the solenoid 24b. Reaches a predetermined value, the solenoid 24b is urged to move the lock member 21 to the lock position.

The solenoid valve control device 26 includes a thermocouple 14 heated by the flame of the pilot burner 13, a solenoid valve drive circuit 30 that operates by the output of the thermocouple 14, and a gas solenoid valve 31, and the pilot burner The gas solenoid valve 31 is kept open when 13 is ignited, and when the output of the thermocouple 14 decreases, the gas solenoid valve 31 is closed to extinguish the burners 3, 4.

The comparison circuit 28 is connected to the solenoid valve drive circuit 30 by the shunt 32, and the gas solenoid valve is operated even when the temperature detected by the thermistor 15 rises and the lock member 21 is operated to the lock position. 31 is closed and the burners 3 and 4 are extinguished. The lock control device 25 may be provided independently of the solenoid valve control device 26 without providing the shunt 32, and the solenoid valve control device 26 may be provided with another valve closing mechanism. Further, a warning device such as a buzzer or a blinking light may be connected to the shunt 32 or the solenoid drive circuit 29.

FIG. 3 is a flowchart of the apparatus shown in FIG. 2. During combustion of the burners 3 and 4, the temperature T inside the refrigerator is detected by the thermistor 15 in step S ₁ , and T is compared with a reference temperature in step S ₂ , if the inner temperature T is higher than the reference value, closes the gas solenoid valve 31 in step S _3, you operate the lock member 21 to the lock position by energizing the solenoid 24b at step S _4. However, if the internal temperature T is lower than the reference temperature in step S ₂ , the solenoid 24b is not energized in step S ₅ and the lock member 21 is not operated.

Next, the locking device 35 of the second embodiment will be described with reference to FIGS. In this device, 36 is an elliptical cam, and the cam 36 is driven by a motor 37, and the power supply circuit of the motor 37 is opened and closed by a motor drive circuit operated by a position switch 38 and the thermistor 15. FIG. 5 shows an equivalent circuit thereof, in which a power source circuit 37a of the motor 37 is provided with a two-contact type position switch 38 and a temperature switch 39 in series.

As shown in FIG. 4, when the long diameter portion 36 a of the cam 36 pushes up the rear portion of the lock member 21 to lock the door 12, the position switch 38 is turned on and the lock member 21 has the short diameter portion 36 b. , The rear portion of the lock member 21 descends and the position switch 38 is turned off. As shown in FIG. 5, the ON contact is connected to the L contact with which the bimetallic type temperature switch 39 contacts at low temperature, and the OFF contact is connected to the H contact with which the temperature switch 39 contacts at high temperature. There is.

When the inside of the baking oven 7 is at a low temperature and the cam 36 contacts the lock member 21 at the short diameter portion 36b so that the door 12 can be opened and closed, when the inside of the baking oven 7 becomes abnormally high, the temperature switch 39 Contacts the H contact and closes the motor circuit 37a, and the motor 37 rotates to push the lock member 21 to the lock position by the long diameter portion 36a of the cam 36 to lock the door 12. At the same time, the position switch 38 is turned on, the motor circuit 37a becomes non-conductive, and the motor 37 is stopped. Next, when the heat source is deenergized and the temperature in the firing chamber 7 becomes low, the temperature switch 39 moves to the L contact side, the motor circuit 37a is closed via the L contact and the ON contact, and the motor 37 rotates to cause the cam to rotate. The short-diameter portion of 36 is brought into contact with the lock member 21, and the lock member 21 is changed to the unlocked position. In this state, the firing device 1 is in the original state in which the door 12 can be opened and closed. If the temperature inside the baking chamber 7 becomes abnormally high during use, the temperature switch 39 switches to the H contact as shown in FIG. 5, and the motor 37 rotates to rotate the cam 36 to the position shown in FIG. 4 as described above. Then lock the door 12. That is, when both the switches 38 and 39 are both lowered or both are raised, there is conduction, and the cam 36 is rotated until it takes the next posture.

Although the circuit of FIG. 5 can be used as it is, it can be used as the device shown in the block diagram of FIG. 6. In FIG. 6, circuits common to those of FIG. . The lock control device 40 of FIG. 6 is different from the lock control device 25 of FIG. 2 in that the lock control device 40 of FIG. 6 includes an output of the comparison circuit 28 and a motor drive circuit 41 controlled by the position switch 38, a motor 37, and a cam 36. The solenoid valve control device 26 is the same as that of FIG.

The operation of this device is as shown in FIG. 7. During the combustion of the burners 3 and 4, the internal temperature T is detected in step S ₁ , and the temperature T is compared with the reference temperature in step S _2. T closed gas solenoid valve 31 at step S _3, if the reference temperature or more, if the position switch 38 is oN in step S ₄ returns to step S _1, the motor 37 is energized in step S ₅ if OFF When the position switch 38 is turned on in step S ₆ , the energization is stopped and the motor 37 is stopped in step S ₇ . At this time, the lock member 21 is in the lock position. If the internal temperature T is lower than the reference temperature in step S ₂ , the position switch 38 is not operated in step S ₈ when it is OFF, and if it is ON, the motor 37 is energized to rotate the motor 37 in step S _9. and, the energization is stopped at step S ₁₁ if the oF F position by detecting the position of the position switch 38 in step S _10, placing the cam 36 in the unlocked position.

Next, a device for locking the door without using the lock control device 25 or 40 will be described with reference to FIG. FIG. 8 shows a third embodiment, and in FIG. 8A, a lock piece 45 made of a shape memory alloy and extending inward is attached to the inner surface of the door 12. When the temperature inside the baking chamber 7 becomes abnormally high, the lock piece 45 is transformed into a memorized hook shape as shown in FIG. 8 (b) and is locked to the back surface of the edge 8a to lock the door 12. To do.

In the fourth embodiment of FIGS. 9 to 10, the door 12 and the juice tray 10 are integrated, and the bimetal lock piece 46 is fixed to the side surface of the juice tray 10 at the rear portion 46a. The stopper 47 is fixed to the inner side surface of the inner bottom 5. The soup tray 10 is normally filled with water and kept at a low temperature. However, when there is no water due to forgetting to add water or evaporation, the oil and fat adhering to the inside smokes. By this temperature rise, the bimetal lock piece 6 is deformed outward as shown in FIG. 10 and engages with the stopper 47 to prevent the juice tray 10 from being pulled out, and locks the door 12 integrated with the juice tray 10. .

In each of the above embodiments, since the door 12 and the juice receiving tray 10 are integrated, the locking means provided on the door 12 side may be provided on the juice receiving tray 10 side, or the lock on the juice receiving tray 10 side. A step may be provided on the door 12 side. Further, even in the case where only the door rotates to open the door, the locking means on the door side and the juice tray side can be used as they are for the door.

[0025]

[Effect of device]

 As is clear from the above description, according to the first means, the door is locked due to an abnormally high temperature in the baking chamber, so that the cook can be prevented from opening the door to generate a large amount of smoke and cook the smoke. This has the effect of preventing release into the room. Further, according to the second means, since the lock piece that deforms and acts at an abnormally high temperature in the refrigerator is used, it is possible to obtain the same effect as the first means with an extremely simple configuration. Furthermore, according to the third means, since there is no locking means at the door or the door opening of the firing chamber, there is no protrusion, and there is an advantage that it can be used with the same feeling as that without locking means.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a calciner using a first embodiment.

FIG. 2 is a block diagram of a control circuit of the same embodiment.

FIG. 3 is a flowchart of the control circuit of the same as above.

FIG. 4 is a side view of the second embodiment.

[Fig. 5] Same as above

FIG. 6 is a block diagram of the control circuit of the same as above.

FIG. 7 is a flowchart of the control circuit of the same as above.

FIG. 8 is a vertical cross-sectional view of the third embodiment, in which (a) is at a low temperature,
(B) is at high temperature

FIG. 9 is a side view of the fourth embodiment.

FIG. 10 Same as above

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Firing device 7 Firing cabinet 8 Door opening 10 Juice saucer 12 Door 13 Pilot burner 14 Thermocouple 15 Thermistor 20, 35 Lock device 21 Lock member 24 Electromagnet 24a Solenoid 25, 40 Lock control device 26 Electromagnetic valve control device 36 Cam 37 Motor 45 , 46 lock pieces

Claims (3)

[Scope of utility model registration request] 1. A firing device comprising a door for loading and unloading cooked food and a heat source for heating the cooked food in a firing chamber, a lock member for preventing the door from opening, and a temperature detector for detecting the temperature inside the firing chamber. And a lock control device that activates the lock member to a lock position when the temperature detector detects an abnormally high temperature, a door lock device for a calciner. 2. A firing device provided with a door for loading and unloading food and a heat source for heating the food in the firing chamber, comprising a lock piece for deforming due to an abnormally high temperature in the firing chamber to lock the door. The door lock device of the firing device. 3. A door lock device for a calciner according to claim 1 or 2, further comprising a soup saucer integrated with the door, wherein the soup saucer is locked to lock the door.