JP3824419B2 - Operation control device for ventilation fan - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation control device for a ventilation fan that operates a ventilation fan provided in a kitchen or the like in conjunction with the use of a cooking device.
[0002]
[Prior art]
Conventionally, in a kitchen or kitchen, a ventilator is used for exhausting steam, smoke or odor generated during cooking. In particular, when the cooking device is heated by burning fuel such as city gas, ventilation for preventing a decrease in oxygen concentration is required.
[0003]
FIG. 6 shows a typical ventilation fan in use. The kitchen counter 1 is provided with a gas stove 2 as a cooking device. A range hood 3 is provided above the gas stove 2, and a ventilation fan 4 is provided in the range hood 3. The ventilation fan 4 can be switched between operation and stop by operating the switch 5. When cooking is performed by igniting the gas stove 2 in the kitchen, the ventilation fan 4 is operated by operating the switch 5 for ventilation.
[0004]
As for the gas stove 2, a thermal power is adjusted in a certain range according to the necessity of cooking. Further, there may be a case where a plurality of gas stoves 2 are installed, or a plurality of stoves, grills, and the like are collectively provided as one gas table. If the number of gas stoves 2 or the like and the thermal power increase, more exhaust capacity of the ventilation fan 4 is required, and a larger air volume is required. However, when the entire gas stove 2 or the like is not used, the need for exhaust is reduced. When the air volume of the ventilation fan 4 is large, the noise accompanying the rotation of the fan also increases. For this reason, the air volume of the ventilation fan 4 can be switched, and the switch 5 may be switched as needed.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 6, when the gas stove 2 and the ventilation fan 4 which are heating cooking apparatuses are provided separately, when using the gas stove 2, the switch 5 must be operated and the ventilation fan 4 must be operated. Further, when the use of the gas stove 2 is stopped, it is necessary to operate the switch 5 to stop the ventilation fan 4. If the ventilation fan 4 is always operated, it is not necessary to operate the switch 5 when the gas stove 2 is used and when it is stopped. However, it is unnecessary to operate the switch 5 when it is unnecessary. Further, when the air volume of the ventilation fan 4 is large, noise is particularly large, and a quiet environment preferable for a house or the like is harmed.
[0006]
In order to operate the ventilation fan 4 only when necessary, it is conceivable to control it in conjunction with the use of a cooking device such as the gas stove 2. If the operation of the ventilation fan 4 is automatically started when the gas stove 2 is ignited, the operation of the ventilation fan 4 can be started when necessary. When the operation state of the ventilation fan 4 is linked to the ignition of the gas stove 2, when the gas stove 2 is extinguished, the operation of the ventilation fan 4 is also stopped. This is because if the gas stove 2 is extinguished, there is no need for ventilation associated with combustion. However, the object to be cooked is still in a high temperature state after cooking and continues to generate steam, smoke or odor. For this reason, if the ventilation fan 4 is stopped, these odors cannot be discharged, and it becomes troublesome because it becomes necessary to operate the switch 5 again to operate the ventilation fan 4.
[0007]
It is an object of the present invention to operate an exhaust fan that can operate the ventilation fan in conjunction with the use state of the cooking device, and can continue operation while ventilation is required even after the use of the cooking device is stopped. Is to provide.
[0008]
[Means for Solving the Problems]
The present invention is an operation control device for a ventilation fan that controls a ventilation fan that can be switched between strong, medium, and weak airflow in conjunction with the operation of the cooking device.
Operation detection means for detecting the operation state of the cooking device, a flame sensor for detecting whether or not the cooking device is lit, and a pan bottom temperature for detecting the temperature of the bottom of the pan heated by the cooking device An operation detecting means having a sensor;
In response to the output from the operation detection means, when the ignition of the heating cooking device is detected by the flame sensor, the ventilation fan starts to be ventilated. When the flame sensor detects fire extinguishing of the heating cooking device, the ventilation fan is Determine whether or not you are operating with medium or strong airflow.If you are operating with medium or strong airflow, reduce the airflow by one step.If you are not operating with medium or strong airflow, Maintain the state, and then wait until the temperature detected by the pan bottom temperature sensor falls below the reference temperature, and after the set time has elapsed from when the temperature detected by the pan bottom temperature sensor falls below the reference temperature, And a control means for stopping the ventilation fan.
[0009]
According to the present invention, the operation state of the cooking device is detected by the operation detecting means. The operation detection means has a flame sensor and a pan bottom temperature sensor, detects whether or not the cooking device is ignited by the flame sensor, and the temperature of the bottom of the pan heated by the cooking pan by the pan bottom temperature sensor is detected. Detected. The control means controls the ventilation fan in response to the output from the motion detection means . When ignition of the cooking device is detected by the flame sensor, the ventilation fan is operated for ventilation by the control means. In this way, the control means causes the ventilation fan to start the ventilation operation at the start of heating of the cooking device, which is when the flame sensor switches from extinguishing to ignition. When fire extinguishing of the cooking device is detected by the flame sensor, it is determined by the control means whether or not the ventilation fan is operating at a medium or strong air volume. When the ventilation fan is operated with medium or strong airflow, the airflow of the ventilation fan is lowered by the control means by one step, and when it is not operated with medium or strong air, the ventilation fan is maintained as it is. Thereafter, the control means waits until the temperature detected by the pan bottom temperature sensor falls below the reference temperature, and after the set time has elapsed from when the temperature detected by the pan bottom temperature sensor falls below the reference temperature, Stop. Thus, the control means that the temperature at the bottom of the pan is lower than the reference temperature from the end of heating of the cooking device, which is when switching from ignition to extinguishing by the flame sensor, and then a set time elapses. Continue the post-purge operation on the ventilator until the condition is met, and then stop the ventilator. In this way, after the end of cooking, until the temperature at the bottom of the pan falls below the reference temperature, the ventilator fan purge operation is reliably continued, and the ventilator fan is stopped after waiting for a set time. Can do. Therefore, the ventilation suitable for the use condition of the heating cooking apparatus can be performed. In addition, in the post-purge operation after the heating of the cooking device is stopped, the control is performed so as to operate the ventilation fan while reducing the air volume, so that the generation of noise can be suppressed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a schematic electrical configuration of an operation control device for a ventilation fan as an embodiment of the present invention. The operation control device of the present embodiment is provided in the gas stove 10. Whether or not the gas stove 10 is ignited is detected by the flame sensor 11. The flame signal detected by the flame sensor 11 is given to a control circuit 12 realized including a microcomputer. When the flame sensor 11 does not detect ignition, the control circuit 12 closes the safety valve 13 to prevent gas leakage.
[0015]
The ignition of the gas when the safety valve 13 is closed is performed by the person pressing the ignition / extinguishing button 14. When the ignition / fire extinguishing button 14 is pressed, the safety valve 13 is opened. When a spark is generated by discharge or the like, the gas burner 15 can be ignited. For example, the gas burner 15 heats the bottom surface of the pan 16 with a flame. When tempura oil or the like is heated in the pan 16, if the temperature rises to about 350 ° C., for example, the oil may burn out. For this reason, the pan bottom temperature sensor 17 is pressed against the bottom of the pan 16 by a spring, detects the temperature of the bottom of the pan 16 and supplies it to the control circuit 12 as a pan bottom temperature signal. When the temperature detected by the pan bottom temperature sensor 17 reaches the overheat reference temperature, for example, the aforementioned 350 ° C., the control circuit 12 controls the safety valve 13 to stop the gas supply and forcibly extinguish the fire.
[0016]
In the present embodiment, the flame sensor 11 is also used as an operation detection unit of the gas stove 10 that is a heating cooking device. In addition, the pan bottom temperature sensor 17 is used for condition determination in the post-purge operation of the ventilation fan. That is, when the flame sensor 11 detects the ignition of the gas burner 15, the gas stove 10 which is a cooking device is in operation, and when the flame sensor 11 cannot detect the flame, the gas stove 10 is extinguished. It is judged. As a condition for continuing the post-purge operation, for example, it is determined that the temperature of the pan 14 detected by the pan bottom temperature sensor 17 is relatively high. When it is determined that the steam, smoke or smell is strong, the post-purge operation is continued.
[0017]
The determination result of the control circuit 12 serving as the control means is transmitted from the signal output circuit 18 to the ventilation fan 20 via the signal cable 19. In the ventilation fan 20, there are a motor 21 for rotationally driving the fan, an air volume control switching device 22 for controlling the rotational speed of the motor 21 to switch the air volume, a microcomputer 23 for performing overall control of the air volume control switching device 22, and A signal input circuit 24 for inputting an interlocking signal transmitted via the signal cable 19 is included. The microcomputer 23 controls the operation state of the ventilation fan 20 according to a preset program. The ventilation fan 20 is not only controllable via the signal cable 19 from the gas stove 10 side, but a person can directly switch the air volume from the manual changeover switch 25. Further, the post-purge operation performed by the ventilation fan 20 may be performed until the time set in the timer 26 elapses.
[0018]
FIG. 2 shows a state in which the gas stove 10 incorporating the operation control device for the ventilation fan of FIG. 1 is used. The gas stove 10 is installed on a kitchen counter 27, for example. A range hood 28 is provided above the gas stove 10, and the ventilation fan 20 is accommodated in the range hood 28. An operation controller 29 having an electrical configuration as shown in FIG. 1 is built in the gas stove 10. The operation of the ventilation fan 20 can also be performed by directly operating the manual changeover switch 25 by a person.
[0019]
FIG. 3 shows a control operation of the operation control device 29 of FIG. When the ignition / extinguishing button 14 of the gas stove 10 is operated and ignited in step a1, the control is started. In step a2, when the flame sensor 11 detects the ignition state, the control circuit 12 in FIG. 1 generates an interlocking signal from the signal output circuit 18 and transmits it to the ventilation fan 20 via the signal cable 19. When the manual changeover switch 25 is already operated by a person and the ventilation fan 20 is not in operation, the microcomputer 23 of the ventilation fan 20 controls the air volume control switching device 22 to drive the motor 21 and put the ventilation fan 20 into the ventilation operation state. To do. For example, if the ventilation fan 20 can switch the air volume between three levels of strong, medium and weak, for example, control is performed so that the air volume becomes medium. When the manual changeover switch 25 has already been operated so that the air volume is medium or large, even if information indicating that the gas stove 10 has been ignited by the interlocking signal is transmitted via the signal cable 19, the microcomputer 23 continues the operation of the motor 21 as it is. When the manual changeover switch 25 is set so that the operation of the motor 21 is weakened, when the information on the ignition of the gas stove 10 is given by the interlock signal, the microcomputer 23 changes the air flow control so that the motor 21 operates in the inside. A signal is provided to the device 22. If a person operates the manual changeover switch 25 while the motor 21 is in operation with the airflow being medium, the microcomputer 23 sends a signal to the airflow control switching device 22 so that the airflow is in accordance with the operation of the manual changeover switch 25. give.
[0020]
In the operation control device 29 on the gas stove 10 side, after step a2, the detection output of the flame sensor 11 is monitored, and when fire extinguishing is detected at step a3, an interlock signal representing information about fire extinguishing is output at step a4 as a signal output circuit. 18 is transmitted to the ventilation fan 20 via the signal cable 19. When the signal input circuit 24 receives the interlocking signal indicating the fire extinguishing, the motor 21 in the ventilation fan 20 gives a signal for reducing the air volume of the motor 21 by one step to the air volume control switching device 22. For example, if the air volume is set to a medium state according to the interlock signal indicating ignition, the air volume is switched to be small. Even if the air volume is set to be medium, if the air volume is further changed by the manual changeover switch 25, the air volume is switched to medium. If the manual changeover switch 25 changes the airflow so that it becomes weak, the airflow is not switched even if an interlocking signal indicating fire extinguishing is given. Even if the motor 21 has already been stopped by the manual changeover switch 25, the stopped state is similarly continued.
[0021]
The operation control device 29 of the gas stove 10 generates an interlock signal indicating fire extinguishing in step a4, and then monitors the output of the pan bottom temperature sensor 17 in step a5, so that the pan bottom temperature becomes lower than a reference temperature, for example, near 100 ° C. Wait for. When the pan bottom temperature becomes lower than the reference temperature in step a5, an interlock signal indicating that the condition is satisfied is generated in step a6 and transmitted to the ventilation fan 20 via the signal cable 19. When the microcomputer 23 of the ventilation fan 20 detects that the detected temperature of the pan bottom temperature sensor 17 is lower than the reference temperature by the interlocking signal input via the signal input circuit 24, the microcomputer 23 further increases the time set by the timer 26. After waiting, the motor 21 is stopped via the air volume control switching device 22.
[0022]
The control circuit 12 of the operation control device 29 determines that the pan bottom temperature sensor 17 has detected a temperature lower than the reference temperature, generates an interlock signal in step a6, and then ends the control in step a7. The pan bottom temperature sensor 17 detects a temperature lower than the reference temperature when the temperature of oil or the like stored in the pan 16 decreases and when the pan 16 itself is moved from the gas stove 10.
[0023]
FIG. 4 shows an operation performed by the microcomputer 23 in the ventilation fan 20 corresponding to the operation of the control circuit 12 of the operation control device 29 of FIG. The operation is started from step b1, and in step b2, it is determined whether or not an operation for instructing the manual changeover switch 25 to operate the motor 21 is performed. When it is being performed, the motor is operated in step b3 according to the operation. In step b4, it is determined whether an interlocking signal indicating ignition of the gas stove 10 has been input via the signal cable 19. When it is not input, the process returns to step b2. When an interlocking signal indicating ignition is input in step b4, it is determined in step b5 whether or not the motor 21 is currently operating at medium or strong. When the vehicle is operating at medium or strong and not operating, that is, when the vehicle is weak or stopped, control is performed so that the air volume is operated at step b6. After the control of step b6 is completed, or when it is determined that the vehicle is driving at medium or strong in step b5, the process proceeds to step b7, and it is determined whether or not the manual changeover switch 25 is operated. When it is determined that the air flow is being operated, the air volume is switched to the air volume according to the operation in step b8.
[0024]
After step b8 is completed, or when it is determined in step b7 that the manual changeover switch 25 is not operated, the process proceeds to step b9, and information indicating fire extinguishing is given by the interlock signal via the signal cable 19 Judge whether or not. If so, it is determined in step b10 whether the vehicle is currently driving or driving at a high level. When it is determined that the vehicle is driving at medium or strong, control is performed so that the strength is lowered by one step at step b11. When it is determined in step b10 that the air volume is medium or strong and the vehicle is operating, control is performed to decrease the air volume by one step in step b11. When it is determined in step b10 that the air volume is weak or stopped, the air volume is not switched. When the interlock signal indicating fire extinguishing is not input in step b9, the process returns to step b7. When it is not determined in step b10 that the vehicle is not driving at medium or strong, or after the switching in step b11 is finished, an interlocking signal indicating that the pan bottom temperature has decreased below the reference temperature is input in step b12. wait. When input is made, the timer 26 is activated in step b13 and waits for the set time to elapse in step b14. When the set time has elapsed, the motor 21 is stopped in step b15, and the procedure is terminated in step b16.
[0025]
In steps b10 to b11 in FIG. 4, switching is performed to lower the air volume by one step. However, as shown in FIG. 5, as another embodiment of the present invention, for example, control to switch to weak is performed. You can also. That is, in step c1, the procedure from step b1 to step b9 in FIG. 4 is performed, and in step c2, it is determined whether or not the ventilation fan is in operation. When it is determined that the vehicle is in operation, the air volume is set to be weak in step c3. If the motor 21 of the ventilation fan is operating in a weak state, the weak state is continued as it is in step c3. If the motor 21 is operating at medium or strong, it is switched to weak at step c3. If the motor 21 is stopped, the stopped state is continued as it is. After the switching of step c3 is completed or when it is determined in step c2 that the motor is stopped, a procedure corresponding to steps b12 to b16 in FIG. 4 is performed in step c4.
[0026]
In each of the embodiments described above, the interlocking signal is transmitted between the gas stove 10 and the ventilation fan 20 by the wired signal cable 19, but it can also be performed using an optical fiber or the like. The interlocking signal can also be transmitted by wireless infrared rays or radio waves. Furthermore, although the operation control apparatus 29 is provided in the gas stove 10, it can also be provided in the ventilation fan 20 side. In addition, an operation control device can be provided separately from the gas stove 10 and the ventilation fan 20. Further, the ventilation fan 20 can switch the air volume in three stages of strong, medium, and weak. However, even if the air volume can be switched in more stages or continuously, or the air volume can be switched in two stages of strong and weak, Similarly, the present invention can be applied by switching so that the air volume is lowered in the post-purge operation. Further, the conditions for the post-purge operation can be set only by the timer 26.
[0027]
【The invention's effect】
According to the present invention as described above, the ventilation fan, in conjunction with the operation of the cooking apparatus, at the start of heating is to start the operation for ventilation, the operation is continued for a post-purge until conditions are met at the end of heating Can do. The ventilation fan not only performs the ventilation operation in conjunction with the operation of the heating cooking device, but also can continue the post-purge operation after the heating is completed. Can be driven automatically.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic electrical configuration of an embodiment of the present invention.
FIG. 2 is a simplified perspective view showing a state where the gas stove 10 and the ventilation fan 20 of FIG. 1 are installed.
FIG. 3 is a flowchart showing a control operation of the operation control device 29 of FIG. 2;
4 is a flowchart showing the operation of the microcomputer 23 of FIG.
FIG. 5 is a flowchart showing the operation of the microcomputer 23 of FIG. 1 as another embodiment of the present invention.
FIG. 6 is a simplified perspective view showing a conventional gas stove 2 and ventilation fan 4 installed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Gas stove 11 Flame sensor 12 Control circuit 13 Safety valve 14 Ignition / fire extinguishing button 16 Pan 17 Pan bottom temperature sensor 19 Signal cable 20 Ventilation fan 21 Motor 22 Air volume control switching device 23 Microcomputer 25 Manual changeover switch 28 Range hood 29 Operation control device

Claims (1)

In the operation control device of the ventilation fan that controls the ventilation fan that can be switched between strong, medium, and weak in conjunction with the operation of the heating cooking device,
Operation detection means for detecting the operation state of the cooking device, a flame sensor for detecting whether or not the cooking device is lit, and a pan bottom temperature for detecting the temperature of the bottom of the pan heated by the cooking device An operation detecting means having a sensor;
In response to the output from the operation detection means, when the ignition of the heating cooking device is detected by the flame sensor, the ventilation fan starts to be ventilated. When the flame sensor detects fire extinguishing of the heating cooking device, the ventilation fan is Determine whether or not you are operating with medium or strong airflow.If you are operating with medium or strong airflow, reduce the airflow by one step.If you are not operating with medium or strong airflow, Maintain the state, and then wait until the temperature detected by the pan bottom temperature sensor falls below the reference temperature, and after the set time has elapsed from when the temperature detected by the pan bottom temperature sensor falls below the reference temperature, And a control means for stopping the ventilation fan.

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