JP2019143919A - Gas cooking stove - Google Patents

Abstract

To provide a gas cooking burner capable of throttling an amount of input gas to a small fire power limit value of a burner, preventing accidental fire (extinction in the middle) in small fire power while securing a wide fire power adjustment range, and shortening a time for moving a valve portion to the minimum small fire power position.SOLUTION: A gas cooking burner is constituted (a) to drive fire power adjustment means at a prescribed low speed lower than a prescribed speed when a time zone includes an execution time of small fire power reduction control and a minimum fire power reduction permission time driving position is not stored at an execution time of the small fire power reduction control, and (b) to drive the fire power adjustment means at a prescribed high speed higher than the prescribed low speed when a time zone includes the execution time of the small fire power reduction control and the minimum fire power reduction permission time driving position is stored at the execution time of the small fire power reduction control.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a gas stove, and more particularly to a gas stove characterized by a control device for a stove burner.

  In recent years, gas stoves configured to be able to cook with a small fire have been used.

  As a combustion control device for a gas burner (combustor) that can be used for such a gas stove, Patent Document 1 discloses a valve unit that controls a gas flow rate and a drive unit that electrically drives the valve unit. And a combustion control device for a gas burner having a thermocouple for detecting the flame of the burner by a thermoelectromotive force and controlling the amount of gas by reading the thermoelectromotive force generated by the thermocouple into the burner controller. ing.

  Patent Document 1 is equipped with such a combustion control device for a gas burner, and when a small fire is used, after the valve portion is once moved to a predetermined small fire position, the gas is further read while reading the thermoelectromotive force generated by the thermocouple. A gas stove is described in which the burner controller controls the combustion in this minimum small fire state when the flow rate is reduced and the thermoelectromotive force generated by the thermocouple becomes a predetermined thermoelectromotive force.

  According to the combustion control device of Patent Document 1, it is possible to reduce the amount of input gas to the small fire limit value of the gas burner regardless of fluctuations in gas type and gas pressure, and a wide range of thermal power can be obtained. It is meaningful to realize a gas stove that can prevent misfire (fire extinguishing in the middle) at the time of a small fire.

JP 2002-31336 A

  However, in the conventional combustion control device, when the small fire is used, the valve portion is once moved to a predetermined small fire position, and then heated by the flame of the gas burner, and further the gas is read while reading the thermoelectromotive force generated by the thermocouple. Since the flow rate is reduced, there is a disadvantage that it takes time to move the valve part to the minimum fire position when using a small fire.

  In other words, the thermocouple has a predetermined heat capacity, and there is a delay time until the thermoelectromotive force generated by the thermocouple changes due to a change in the flame state of the gas burner. In order to read the thermoelectromotive force generated by the thermocouple by being heated by the flame of the gas burner after moving the valve to the small fire position, the gas flow rate is further reduced in consideration of the above delay time Therefore, when using a small fire, it takes a certain amount of time to move the valve to the minimum small fire position, and it is difficult to move the valve to the minimum small fire position quickly. is there.

  The present invention solves the above-mentioned problems, and can reduce the amount of input gas to the small fire limit value of the burner regardless of fluctuations in gas type and gas pressure, and ensures a wide adjustment range of thermal power. However, an object of the present invention is to provide a gas stove that can prevent misfire (fire extinguishment) at the time of a small fire, and that can shorten the time until the valve unit is moved to the minimum small fire position.

In order to achieve the above object, the gas stove of the present invention comprises:
By manually operating the thermal power command operation unit in the forward direction and the reverse direction, a signal output unit that outputs a thermal power increase signal that commands an increase in the thermal power of the burner and a thermal power decrease signal that commands a decrease in thermal power,
The signal output from the signal output unit is input, and based on the signal, the heating power adjusting means is driven at a predetermined speed to set the heating power of the cono burner to a preset maximum heating power and a preset setting minimum heating power. Control means for executing manual operation thermal power control to be adjusted to,
A thermocouple for detecting the ignition state of the stove burner,
A gas stove configured to stop the combustion of the stove burner when the output of the thermocouple decreases to a value smaller than a predetermined fire extinguishing detection threshold after detecting the ignition of the stove burner by the output of the thermocouple. There,
Minimum thermal power reduction permission command means for enabling the thermal power of the cono burner to be adjusted to a thermal power smaller than the set minimum thermal power, and when the small thermal power reduction control is commanded by the minimum thermal power reduction permission command means, The control means drives the heating power adjusting means based on the signal output from the signal output unit, and makes it possible to adjust the heating power of the conburner to a heating power smaller than the set minimum heating power. Run
The control means includes a storage unit that divides a predetermined cycle of an integer multiple of 24 hours into a plurality of time zones, stores a time zone in which the control execution time is in the plurality of time zones, and When the output of the thermocouple during the execution of the small thermal power reduction control is equal to or less than the thermal power adjustment means position determination threshold value set to a value larger than the fire extinguishing detection threshold value, the drive position of the thermal power adjustment means at that time is determined. As the minimum thermal power reduction permission driving position, it is configured to store together with the time zone to which the time point belongs,
(A) At the time of execution of the small thermal power reduction control, when the driving position at the time of the minimum thermal power reduction permission is not stored together with the time zone including the execution time of the small thermal power reduction control, the thermal power adjusting means is Drive at a predetermined low speed, lower than the predetermined speed,
(B) At the time of execution of the small thermal power reduction control, when the minimum thermal power reduction permission drive position is stored together with the time zone including the execution time of the small thermal power reduction control, the thermal power adjustment means is It is characterized by being driven at a predetermined high speed that is higher than a predetermined low speed.

  In the gas stove according to the present invention, when the output of the thermocouple decreases to a check threshold value that is larger than the fire extinguishing detection threshold value and smaller than the thermal power adjustment means position determination threshold value during execution of the small thermal power reduction control, the control is performed. Preferably, the means is configured to stop the small heating power reduction control.

In addition, it comprises release command means for issuing a release command for the small heating power reduction control,
When the small thermal power reduction control command is commanded by the minimum thermal power reduction permission command unit, the control unit continuously executes the small thermal power reduction control until the cancellation command is issued by the cancellation command unit It is preferable that the heating power of the burner is adjusted to a heating power smaller than the set minimum heating power.

  Further, it is preferable that the control means is configured to notify that the small heating power reduction control is being executed.

  The gas stove of the present invention is configured as described above, and (a) at the time of execution of the small heating power reduction control, the drive position at the time of the minimum heating power reduction permission is stored together with the time zone including the time of execution of the small heating power reduction control. If not, the thermal power adjustment means is driven at a predetermined low speed lower than the predetermined speed. (B) When the small thermal power reduction control is executed, the minimum thermal power reduction permission is permitted along with the time zone including the execution time of the small thermal power reduction control. When the hour drive position is stored, the thermal power adjustment means is driven at a predetermined high speed higher than the predetermined low speed, so that the burner's small fire limit value is reached regardless of the gas type and gas pressure fluctuations. The amount of gas can be reduced and a wide range of thermal power can be obtained. In addition, it is possible to prevent misfire (fire extinguishing in the middle) at the time of a small fire, and after the control unit once memorizes the drive position at the time of minimum thermal power reduction permission, drive the thermal power adjusting means at a speed higher than a predetermined low speed. Therefore, it is possible to shorten the time until the valve unit is moved to the minimum small fire position.

  Further, during the execution of the small thermal power reduction control, when the output of the thermocouple decreases to a check threshold value that is larger than the fire extinguishing detection threshold value and smaller than the thermal power adjustment unit position determination threshold value, the control unit stops the small thermal power reduction control. When configured in this way, even when the usage environment of the gas stove changes, such as when the supply pressure of the fuel gas supplied to the gas stove decreases, it is possible to prevent misfire (fire extinguishing) during a small fire.

  Also, a release command means for issuing a release command for the small thermal power reduction control is provided. When the small thermal power reduction control is commanded by the minimum thermal power reduction permission command means, the control means issues a release command by the release command means. If it is configured to continuously execute the small thermal power reduction control until it is issued and adjust the thermal power of the control burner to a thermal power smaller than the set minimum thermal power, the small thermal power reduction control is commanded every time the control burner is used. This makes it possible to save time and improve usability. In other words, if the user wants to change and adjust the thermal power to a thermal power smaller than the set minimum thermal power, a small thermal power reduction control is commanded, but the user sets the thermal power to a thermal power smaller than the set minimum thermal power. Since it is assumed that the state in which the change adjustment is desired is normally continued, once the small heating power reduction control is commanded, the small heating power reduction control is continued until the cancellation command is commanded by the cancellation command means. As a result, usability can be further improved.

  When the control means is configured to notify that the small thermal power reduction control is being executed, the user performs the small thermal power reduction control by notifying that the small thermal power reduction control is being executed by the control means. Since the user can be aware that it is in the middle, the user is encouraged to pay attention to the blow-off caused by the wind, and the output of the thermocouple is reduced to a value smaller than the fire-extinguishing detection threshold. Generation | occurrence | production can be suppressed and it becomes possible to improve reliability.

It is a perspective view which shows the external appearance structure of the gas stove concerning one Embodiment of this invention. It is a schematic block diagram of the gas stove concerning one Embodiment of this invention. It is a side view which shows the structure of the operation part for thermal power instructions of the gas stove concerning one Embodiment of this invention, and a signal output part. It is a figure which shows the operation state of the operation part for thermal power instructions of the gas stove concerning one Embodiment of this invention, and a signal output part. It is a flowchart of the subroutine concerning the thermal power reduction control by the control part of the gas stove concerning one Embodiment of this invention. It is a flowchart of the subroutine concerning minimum thermal power position memory | storage control by the control part of the gas stove concerning one Embodiment of this invention.

  Hereinafter, the embodiment of the present invention will be shown and the features thereof will be described in more detail.

[Embodiment]
<Basic configuration>
FIG. 1 is a perspective view showing a gas stove according to an embodiment of the present invention.

  As shown in FIG. 1, this gas stove is a table-type gas stove provided with a grill portion 3 having two stove burners 1a, 1b (K) and a grill burner 2 (see FIG. 2).

  The gas stove according to the present embodiment includes a grill exhaust port 4 for exhausting combustion exhaust gas from the grill portion 3, and the upper surface of the gas stove is covered with a top plate 5. Moreover, on the upper part of the top plate 5, the virtues 6 which support the to-be-heated material (pan etc.) heated with each stove burner 1a, 1b (K) are mounted.

  Further, on the front (front side) of the gas stove, there is provided a manual operation section S for commanding ignition, extinguishing, and heating power adjustment of each of the stove burners 1a, 1b (K) and the grill burner 2.

  Further, the control unit H (see FIG. 2), which is a control means including a microcomputer configured to execute various types of control, performs control based on the operating state commanded by the manual operation unit S. 1b (K) and the grill burner 2 are controlled. That is, in this embodiment, the stove burners 1a and 1b each constitute a cooking stove burner K using gas as fuel.

  As shown in FIG. 2, each of the two burners 1a and 1b (K) is provided with a spark plug 7 and a thermocouple 8 for detecting an ignition state as ignition means.

  The grill burner 2 is configured as a double-sided burner having an upper surface burner 2a and a pair of left and right lower surface burners 2b, 2c. An ignition plug 7 serving as an ignition means is provided on each of the upper surface burner 2a and the pair of left and right lower surface burners 2b, 2c. A thermocouple 8 is provided for detecting the ignition state.

  Moreover, the temperature sensor 10 which contacts the bottom face part of the to-be-heated object supported by Gotoku 6 and detects the temperature of the to-be-heated object is provided in the stove burner 1a, 1b (K).

  Next, the gas supply structure to the two stove burners 1a, 1b (K) and the grill burner 2 will be described. An original gas solenoid valve 12 is provided in the original gas supply path 11.

  The source gas supply path 11 branches into three systems: a right burner branch path 13a, a left burner branch path 13b, and a grill burner branch path 13c. The branch path 13c for the grill burner 2 to the grill burner 2 further branches into a branch path for the upper surface burner and a branch path for the lower surface burner. The branch path has a flow path 15 with an orifice of and an open / close solenoid valve, respectively. A bypass path 17 having 16 is provided.

  In each of the right burner branch path 13a, the left burner branch path 13b, and the grill burner branch path 13c, a flow rate control valve 18 that adjusts the gas flow rate by driving a stepping motor to adjust the heating power of each burner. Is provided.

  The flow rate control valve 18 includes a stepping motor (not shown) as a drive source and a flow rate adjusting mechanism (not shown) driven by the stepping motor. In this embodiment, the flow control valve 18 constitutes a heating power adjusting means.

  Next, the configuration of the manual operation unit S will be described. On the front side (front side) of the gas stove, as the manual operation unit S, three heating units for commanding ignition, extinguishing, and thermal power control for each of the two stove burners 1a, 1b (K) and the grill burner 2 are provided. A state adjustment unit 28 (manual operation unit S) is provided.

  Since these three heating state adjustment units 28 have the same configuration, the configuration of the heating state adjustment unit 28 for the left-hand side burner 1b will be described as a representative, and description of the other components will be omitted.

  As shown in FIG. 3, the cylindrical rotation operation part 31 is provided in the state penetrated from the back side through the insertion hole 30 formed in the front panel 29 of a gas stove. The rotation operation unit 31 is configured to be switchable between a non-operation state that is substantially flush with the front panel 29 and an operation state that protrudes forward each time a pressing operation is performed by a position holding mechanism (not shown). When 31 is switched to the operation state, it is configured to be rotatable in each of the forward rotation direction and the reverse rotation direction.

  Inside the front panel 29, there is provided an ignition switch 32 which is turned off when the rotary operation unit 31 is in an inactive state and turned on when in an activated state. The switching signal of the ignition switch 32 is input to the control unit H. The control unit H starts the ignition operation for the left-side combustor 1b when the ignition switch 32 is switched on, and the left side when the ignition switch 32 is switched off. The combustion operation of the stove burner 1b is stopped.

  In addition, a rotary encoder 33 that outputs a pulse signal in accordance with the rotation operation of the rotation operation unit 31 is provided in the front panel 29. That is, the rotary operation unit 31 is connected to the operation shaft 34 of the rotary encoder 33 so as to be able to rotate integrally and allow relative movement in the axial direction.

  In the rotary encoder 33, one of the two pulse signals has a phase advanced from the other pulse signal in accordance with the rotation operation in one direction of the rotation operation unit 31, and the rotation operation unit 31 moves in the other direction. In a state where the phase of the other pulse signal is advanced from that of the one pulse signal in accordance with the rotation operation, two pulse signals having different phases are output in accordance with the rotation operation of the rotation operation unit 31. .

  In other words, the rotary encoder 33 includes two output terminals, and the pulse signals having different phases as described above are output from the two output terminals. Since such a rotary encoder 33 is a well-known one, a detailed description thereof will be omitted.

  In the present embodiment, the rotation operation unit 31 described above constitutes a thermal power command operation unit, and the rotary encoder 33 constitutes a signal output unit.

  As shown in FIG. 4, on the outer surface side of the front panel 29, a thermal power display unit 36 in which a plurality of LED lamps 35 for displaying thermal power are arranged in an arc shape is provided around each rotation operation unit 31. . That is, the heating power (thermal power) of the stove burner 1b is adjusted and set to the heating power of one stage among a plurality of stages (10 in the present embodiment) set between the maximum heating power and the minimum heating power of the stove burner 1b. It is configured to be able to.

  This thermal power display unit 36 uses any one of the LED lamps 35 according to the magnitude of the thermal power set in the rotary operation unit 31 using a plurality of (10 in this embodiment) LED lamps 35 as a level meter. It is configured to light up and display.

  Then, based on the pulse signal output from the rotary encoder 33, the control unit H determines whether the rotation operation direction of the rotation operation unit 31 is a positive direction instructing an increase in the heating power of the control burner 1b. Whether the direction is a reverse direction instructing a decrease in the thermal power of 1b, the forward / reverse and the rotational operation amount are determined, and the thermal power of the left-side combustor 1b is increased or decreased in accordance with the determined rotational operation direction and the rotational operation amount. Manual operation thermal power control is executed in which the number of thermal power steps is decreased and adjusted. At this time, the data of the two pulse signals output from the rotary encoder 33 are repeatedly read every predetermined unit time, and the rotation operation is performed based on the data pattern in the read data of the two pulse signals. The rotation operation direction and the rotation operation amount of the unit 31 are determined.

<Characteristic configuration>
Next, a characteristic configuration of the gas stove according to the present embodiment will be described.
In the gas stove of the present embodiment, the operation of the small heating power reduction mode switch Z is instructed to execute the small heating power reduction control, and the flow control valve 18 is driven based on the heating power phenomenon signal output from the rotary encoder 33 to thereby operate the stove burner. In the normal mode until the control unit H executes a small heating power reduction control (described in detail later) that enables the heating power of 1b to be adjusted to a heating power smaller than the set minimum heating power P1, the rotation operation for the combustor 1b is performed. Even when the heating power of the stove burner 1b is decreased by operating the unit 31, the heating power of the stove burner 1b is configured to be smaller than the preset minimum heating power P1 and cannot be adjusted.

  This set minimum thermal power P1 is set in consideration of manufacturing variations of parts related to combustion of the stove burner 1b, fluctuations in the supply pressure of the fuel gas supplied to the gas stove, and the like.

Next, the small heating power reduction control described above will be described.
In the vicinity of the rotary operation unit 31 for the stove burner 1b, the control unit H is instructed to execute small heating power reduction control so that the heating power of the stove burner 1b can be changed and adjusted to be smaller than the set minimum heating power P1. A minimum heating power reduction mode switch Z (FIGS. 1 and 4) is provided. The minimum heating power reduction mode switch Z corresponds to the minimum heating power reduction permission command means.

  When the minimum thermal power reduction mode switch Z is operated to instruct execution of the small thermal power reduction control, the control unit H drives the flow rate control valve 18 based on the thermal power phenomenon signal output from the rotary encoder 33, and the control burner 1b. The small thermal power reduction control that enables the thermal power to be adjusted to a thermal power smaller than the set minimum thermal power P1 is executed.

  The small thermal power reduction control includes the minimum thermal power position memory control. The minimum thermal power position memory control will be described in detail later.

  When the small heating power reduction control is executed, the control unit H divides a predetermined cycle that is an integral multiple of 24 hours into a plurality of time zones, and stores which time zone TB the control execution time point is in the plurality of time zones. Then, the minimum flow position (minimum opening) KP of the flow control valve (thermal power adjusting means) 18 in the small thermal power reduction control is stored together with the time zone TB at the time of control execution.

  When the minimum flow position (minimum opening degree) KP is stored together with the time zone TB, the minimum thermal power position memory control included in the small thermal power reduction control is executed, and the thermocouple 8 that is executing the minimum thermal power position memory control is executed. When the output is equal to or less than the thermal power adjustment means position determination threshold (3 mV in this embodiment) set to a value greater than the fire extinguishing detection threshold (1 mV in this embodiment), the flow rate control valve (thermal power adjustment) at this time (Means) The drive position 18 is stored as the minimum thermal power reduction permission drive position KP together with the time zone TB to which the time point belongs.

  Then, depending on whether or not the minimum flow rate position (minimum opening) KP is stored together with the time zone TB, different control is performed as control of the flow rate control valve (thermal power adjusting means) 18.

In particular,
(A) At the time of execution of the small thermal power reduction control, if the minimum thermal power reduction permission drive position KP (corresponding to the minimum flow position) is not stored together with the time zone TB including the execution time of the small thermal power reduction control, the flow rate The control valve (thermal power adjusting means) 18 is driven at a predetermined low speed (for example, 100 pps) lower than a predetermined speed (normal speed when the small thermal power reduction control is not executed, for example, 300 pps),
(B) When the small thermal power reduction control is performed, the minimum thermal power reduction permission drive position KP (corresponding to the minimum flow position) is stored together with the time zone TB including the small thermal power reduction control execution time. The control valve (thermal power adjusting means) 18 is driven at a predetermined high speed (300 pps in this embodiment) higher than a predetermined low speed (for example, 100 pps).

  Since the gas stove of the present embodiment is configured in this way, the heating power of the stove burner 1b, that is, the amount of gas is reduced to a small fire limit value smaller than the set minimum heating power P1 regardless of fluctuations in gas type and gas pressure. It is possible to obtain a wide range of thermal power.

  In addition, it is possible to prevent misfire (fire extinguishing in the middle) at the time of a small fire, and after the control unit once memorizes the drive position KP at the time of minimum thermal power reduction permission, the flow control valve (thermal power adjusting means) 18 is set to a predetermined low level. Since it can be driven at a speed higher than the speed (for example, 100 pps) (300 pps in the present embodiment), it is possible to shorten the time until the valve unit is moved to the minimum small fire position.

  Here, a predetermined cycle that is an integer multiple of 24 hours is divided into a plurality of time zones, and whether or not the minimum heating power reduction permission driving position (minimum flow rate position (minimum opening)) KP is stored together with the time zone TB. Accordingly, the reason why the flow rate control valve (thermal power adjusting means) 18 is configured to perform different control will be described.

It is considered that the supply pressure of the fuel gas supplied to the gas stove varies periodically depending on the time zone in one day (24 hours).
For example, it is conceivable that the gas supply pressure slightly decreases in the evening or morning when gas is used for preparing meals in many homes during the day.

  In addition, it is conceivable that the time period during which a lot of gas is used varies depending on the day of the week.

  Therefore, a predetermined cycle that is an integral multiple of 24 hours is divided into a plurality of time zones, and whether or not the minimum heating power reduction permission driving position (minimum flow rate position (minimum opening)) KP is stored together with the time zone TB. Thus, by controlling the flow rate control valve (thermal power adjusting means) 18 differently, the thermal power of the burner 1b is affected by the fluctuation of the pressure of the supplied fuel gas to the thermal power smaller than the set minimum thermal power P1. It can be changed stably without incurring fires and without incurring fires.

  In addition, it is preferable to divide the time zone into seven times of 24 hours, so that the control according to the present invention can be appropriately performed without being affected by the pressure fluctuation due to the day of the week.

  During execution of the small thermal power reduction control, the LED lamp 35 (see FIGS. 1 and 4) provided in the thermal power display unit 36 is configured to notify that effect.

  Specifically, when the small heating power reduction control is not executed, the LED lamp 35 is turned on (not flashing but continuously turned on) to display the heating power at that time. On the other hand, during the execution of the small heating power reduction control, the LED lamp 35 corresponding to the set minimum heating power P1 is blinked (for example, blinking in a 1 second cycle of 0.5 second lighting and 0.5 second lighting off). It is configured so that the user can recognize that it is being executed.

  Further, during the execution of the small thermal power reduction control, the output of the thermocouple 8 is greater than the fire extinguishing detection threshold (1 mV in this embodiment) and smaller than the threshold for determining the thermal power adjusting means position (3 mV in this embodiment). In this embodiment, when the voltage drops to 2.5 mV), the control unit H is configured to stop the small heating power reduction control.

  That is, regardless of whether the small thermal power reduction control is being executed or the small thermal power reduction control is not being executed, the output of the thermocouple 8 input to the control unit H is the fire extinguishing detection threshold value. When it is smaller than (1 mV in the present embodiment), the control unit H drives the original gas solenoid valve 12 and the flow rate control valve 18 to stop the flow of the fuel gas so as to stop the combustion of the combustor 1b. However, during the execution of the small heating power reduction control, the check threshold (in this embodiment), the output of the thermocouple 8 is set to a value greater than the fire extinguishing detection threshold (1 mV in this embodiment). When the temperature is smaller than 2.5 mV), the small heating power reduction control is interrupted, and the heating power of the combustor 1b is decreased too much, so that the output of the thermocouple 8 becomes the above-mentioned extinction detection threshold (1 mV in this embodiment). Becomes smaller, the combustion of the stove burner 1b is to be prevented that would stop.

  This makes it possible to prevent misfire (fire extinguishment) in the event of a small fire even when the operating environment of the gas stove suddenly changes, such as when the supply pressure of fuel gas supplied to the gas stove suddenly drops. Become.

  In other words, in the present embodiment, even when the small thermal power reduction control is being executed, the small thermal power reduction control is interrupted when the output of the thermocouple 8 falls below the check threshold (2.5 mV in this embodiment). The output of the thermocouple 8 becomes smaller than the above-mentioned extinguishing detection threshold (1 mV in this embodiment) by reducing the heating power of the burner 1b too much, and the burning of the burner 1b is stopped. This makes it possible to prevent the occurrence of the failure more reliably.

  As described above, in the present embodiment, the driving speed of the stepping motor that drives the flow control valve 18 is not reduced during the execution of the small heating power reduction control compared to the case where the small heating power reduction control is not being executed. It is configured.

  Specifically, when the small heating power reduction control is not being executed, the stepping motor that drives the flow rate control valve 18 is driven at a predetermined speed (300 pps), and even during the execution of the small heating power reduction control, the control unit H After storing the driving position (minimum flow position (minimum opening)) KP together with the time zone TB, the stepping motor that drives the flow control valve 18 is driven at a predetermined speed (300 pps). It is configured.

  That is, the driving speed of the thermal power adjusting means with respect to the amount of change in the thermal power reduction signal is the same even when the small thermal power reduction control is being executed, compared to the case where the small thermal power reduction control is not being executed.

  In the present embodiment, after the minimum thermal power reduction permission mode is commanded by operating the minimum thermal power reduction mode switch Z (pressing operation for 2 seconds or more) and executing the small thermal power reduction control, Until the minimum thermal power reduction mode switch Z is operated (pressing operation for 2 seconds or more), the small thermal power reduction control is configured to be continuously executed, and the minimum thermal power reduction mode switch Z is reduced to the minimum thermal power reduction. It is configured to also serve as a release command means for issuing a permission mode release command.

  Since the gas stove according to the present embodiment is configured as described above, every time the stove burner is used, the trouble of instructing execution of the small heating power reduction control is saved, and the usability is further improved. That is, when the user desires to change and adjust the thermal power to a thermal power smaller than the set minimum thermal power, the user is instructed to execute the small thermal power reduction control, but the user sets the thermal power to be smaller than the set minimum thermal power. Since it is considered that the state of desire to change and adjust to the thermal power is likely to continue in many cases, once the execution of the small thermal power reduction control is commanded, the small thermal power decreases until the cancellation command is commanded by the cancellation command means By continuing the control, it is possible to further improve the usability.

  Next, the control operation of the control unit H related to the small heating power reduction control based on the command of the minimum heating power reduction mode switch Z will be described.

  In the present embodiment, a description will be given of a case in which small heating power reduction control is performed on the left-hand side burner 1b of the two burner 1b and grill burner 2, but for the right-hand side burner 1a. The small heating power reduction control may be executed, or the small heating power reduction control may be executed for both the left and right side burners 1b and 1a. That is, the stove burner to which the present invention is applied is not limited by this embodiment.

  Hereinafter, the small heating power reduction control will be described with reference to the flowcharts of FIGS. 5 and 6.

  In the gas stove according to the present embodiment, when the minimum heating power reduction mode switch Z is operated (pressing operation for 2 seconds or more), the minimum heating power reduction mode switch Z is operated (pressing for 2 seconds or more) by a main routine (not shown). The operation is detected (recognized), and the “small heating power reduction control” subroutine shown in FIG. 5 and the “minimum heating power position storage control” subroutine shown in FIG. 6 are executed.

  When the “small heating power reduction control” subroutine shown in FIG. 5 is executed, first, in S101, it is determined whether or not the command heating power ≧ the set minimum heating power P1 or the storage flag of the current time zone = 0 (that is, It is determined whether or not the current time zone TB in which the “small heating power reduction control” is being executed and the position KP of the heating power adjusting means 18 are not stored.

In S101, the command thermal power ≧ the set minimum thermal power P1 (that is, the command thermal power is not less than the set minimum thermal power P1) or the current time zone storage flag = 0 (that is, the current time zone TB and the position KP of the thermal power adjusting means 18) Is not stored), the command thermal power is equal to or greater than the set minimum thermal power P1 or the current time zone TB and the position KP of the thermal power adjusting means 18 are not stored. Return to the main routine.
In this case, after returning to the main routine, a “minimum thermal power position storage control” subroutine (see FIG. 6) described later is executed.

  If it is determined as “No” in S101, the command thermal power is less than the set minimum thermal power P1, and the current time zone TB and the position KP of the thermal power adjusting means 18 are stored. In S102, the thermal power adjusting means 18 is driven at a high speed, that is, at a predetermined speed (300 pps in the present embodiment), with the position KP of the thermal power adjusting means 18 stored together with the stored current time zone TB as a target position. To do.

  In S103, it is determined whether or not the thermoelectromotive force generated in the thermocouple 8 is greater than 2.5 mV.

  In S103, if the thermoelectromotive force generated in the thermocouple 8 is not larger than 2.5 mV, that is, if the thermoelectromotive force generated in the thermocouple 8 is 2.5 mV or less, the process proceeds to S105 and the thermal power adjusting means 18 is set. It stops, returns, returns to the main routine, and the thermal power reduction control is stopped.

  In S103, when the thermoelectromotive force generated in the thermocouple 8 is greater than 2.5 mV, the process proceeds to S104, and it is determined whether or not the position of the thermal power adjusting means 18 has reached KP corresponding to TB.

  In S104, when the position of the thermal power adjusting means 18 has not reached KP corresponding to TB, the process returns to S102 and the driving of the thermal power adjusting means 18 is continued.

  In S104, when the position of the thermal power adjusting means 18 has reached the KP corresponding to TB, the process proceeds to S105, the thermal power adjusting means 18 is stopped, the process returns, the process returns to the main routine, and the thermal power reduction control is finished. .

  When the “minimum thermal power position storage control” subroutine shown in FIG. 6 is executed, first, in step S201, the command thermal power is equal to or greater than the set minimum thermal power P1, or the minimum thermal power position storage control is executed. It is determined whether or not the time zone TB and the position KP of the thermal power adjusting means 18 are stored.

  In S201, the command thermal power ≧ the set minimum thermal power P1 (that is, the command thermal power is not less than the set minimum thermal power P1), or the current time zone storage flag = 1 (that is, the current time zone TB and the position KP of the thermal power adjusting means 18). Is stored), the process returns to the main routine.

  If it is determined as “No” in S201, the command thermal power is less than the set minimum thermal power P1, and the current time zone TB and the position KP of the thermal power adjusting means 18 are not stored. Then, it is determined whether or not the thermal power at the current position of the thermal power adjusting means 18> the set minimum thermal power P1.

In S202, if the thermal power at the current position of the thermal power adjusting means 18 is greater than the set minimum thermal power P1, the process proceeds to S206, and the thermal power adjusting means 18 is driven to the thermal power decreasing side by the decrease command step. However, at this time, the thermal power adjusting means 18 is driven by the number of steps that does not become less than the position corresponding to the set minimum thermal power P1 after the thermal power adjusting means 18 is driven to the thermal power decreasing side.
Then, the process returns to the main routine.

  In S202, if the thermal power at the current position of the thermal power adjusting means 18 is not greater than the set minimum thermal power P1, the process proceeds to S203, and the thermal power adjusting means 18 is set to the thermal power decreasing side so that its driving speed is low (100 pps in this embodiment). To proceed to S204.

  In S204, it is determined whether or not the electromotive force of the thermocouple 8 ≦ 3 mV.

  If the electromotive force of the thermocouple 8 is not 3 mV in S204, that is, if the electromotive force of the thermocouple 8 is> 3 mV, the process returns to S203, and the driving speed of the thermal power adjusting means 18 is low (100 pps in this embodiment). It continues to drive to a thermal-power reduction side so that it may become.

  In S204, if the electromotive force of the thermocouple 8 is ≦ 3 mV, the process proceeds to S205, the thermal power adjusting means 18 is stopped, the time zone at that time is set as TB and stored together with the position KP of the thermal power adjusting means 18 at that time, and the return And return to the main routine.

  After returning to the main routine, until a release command is issued by the release command means (that is, until the minimum thermal power reduction mode switch Z is operated again (pressing operation for 2 seconds or more)), “small thermal power reduction control” Will be executed.

[Another embodiment]
The present invention is not limited to the above-described embodiment, and may be configured as in other embodiments 1 to 7 as described below.

<Another embodiment 1>
In the above embodiment, while the small thermal power reduction control is being performed, the LED lamp 35 included in the thermal power display unit 36 is blinked so that the user can recognize that the small thermal power reduction control is being performed. A display unit for notifying that the reduction control is being executed may be provided separately from the thermal power display unit 36, and notifying that the small thermal power reduction control is being executed by a buzzer sound or a voice. You may comprise.

<Another embodiment 2>
Moreover, in the said embodiment, although the rotation operation part 31 comprised the operation part for thermal power instructions, the operation part for thermal power instructions does not need to be a rotary type, and the operation part for thermal power instructions is a slide operation type. It is also possible to configure it.

<Another embodiment 3>
Moreover, in the said embodiment, although the signal output part is comprised by the rotary encoder 33 which outputs a pulse digitally, you may comprise so that an analog signal may be output using a variable resistor as a signal output part. .

<Another embodiment 4>
Moreover, although the said embodiment demonstrated the example which applied this invention to the table type gas stove, it is possible to apply also to a drop-in stove.

<Another embodiment 5>
Moreover, although the flow control valve provided with the flow adjustment mechanism driven by the stepping motor constitutes the thermal power adjusting means in the above embodiment, the flow control valve is limited to the one driven by the stepping motor. Instead of this, the flow control valve may be configured to be driven by a DC motor other than the stepping motor.

<Another embodiment 6>
Further, in the above embodiment, after the execution of the small heating power reduction control is instructed and the small heating power reduction control is executed, the small heating power is reduced until the minimum heating power reduction mode switch Z is operated again (pressing operation for 2 seconds or more). Although the reduction control is configured to be continuously executed, the small heating power reduction control may be terminated with the extinguishing of the stove burner 1b.

<Another embodiment 7>
Further, in the above embodiment, even when the small heating power reduction control is being executed, if it is determined that the electromotive force of the thermocouple 8 is not larger than the check threshold (2.5 mV in the above embodiment), the small Although the configuration is such that the thermal power reduction control is stopped, the small thermal power reduction control may be continued regardless of the electromotive force of the thermocouple 8 as long as the small thermal power reduction control is being executed.

  The present invention is not limited to the above embodiment in other points, and various modifications can be made within the scope of the present invention.

1a, 1b (K) stove burner 2 grill burner 2a upper surface burner 2b, 2c, pair of left and right lower surface burners 3 grill part 4 grill exhaust port 5 top plate 6 virtues 7 spark plug 8 thermocouple 10 temperature sensor 11 source gas supply path 12 source Gas solenoid valve 13a Branch for right burner 13b Branch for left burner 13c Branch for grill burner 15 Flow path with orifice 16 Open / close solenoid valve 17 Bypass path 18 Flow control valve (thermal power adjusting means)
28 Heating state adjustment unit 29 Insertion hole formed in front panel 30 Insertion hole 31 Rotation operation unit (operation unit for thermal power command)
32 Ignition switch 33 Rotary encoder (signal output unit)
34 Operation shaft 35 LED lamp 36 Thermal power display section H Control section (control means)
K stove burner of orifice S manual operation part (heating state adjustment part)
Z Minimum thermal power reduction mode switch (Minimum thermal power reduction permission command means)

Claims (4)

By manually operating the thermal power command operation unit in the forward direction and the reverse direction, a signal output unit that outputs a thermal power increase signal that commands an increase in the thermal power of the burner and a thermal power decrease signal that commands a decrease in thermal power,
The signal output from the signal output unit is input, and based on the signal, the heating power adjusting means is driven at a predetermined speed to set the heating power of the cono burner to a preset maximum heating power and a preset setting minimum heating power. Control means for executing manual operation thermal power control to be adjusted to,
A thermocouple for detecting the ignition state of the stove burner,
A gas stove configured to stop the combustion of the stove burner when the output of the thermocouple decreases to a value smaller than a predetermined fire extinguishing detection threshold after detecting the ignition of the stove burner by the output of the thermocouple. There,
Minimum thermal power reduction permission command means for enabling the thermal power of the cono burner to be adjusted to a thermal power smaller than the set minimum thermal power, and when the small thermal power reduction control is commanded by the minimum thermal power reduction permission command means, The control means drives the heating power adjusting means based on the signal output from the signal output unit, and makes it possible to adjust the heating power of the conburner to a heating power smaller than the set minimum heating power. Run
The control means includes a storage unit that divides a predetermined cycle of an integer multiple of 24 hours into a plurality of time zones, stores a time zone in which the control execution time is in the plurality of time zones, and When the output of the thermocouple during the execution of the small thermal power reduction control is equal to or less than the thermal power adjustment means position determination threshold value set to a value larger than the fire extinguishing detection threshold value, the drive position of the thermal power adjustment means at that time is determined. As the minimum thermal power reduction permission driving position, it is configured to store together with the time zone to which the time point belongs,
(A) At the time of execution of the small thermal power reduction control, when the driving position at the time of the minimum thermal power reduction permission is not stored together with the time zone including the execution time of the small thermal power reduction control, the thermal power adjusting means is Drive at a predetermined low speed, lower than the predetermined speed,
(B) At the time of execution of the small thermal power reduction control, when the minimum thermal power reduction permission drive position is stored together with the time zone including the execution time of the small thermal power reduction control, the thermal power adjustment means is A gas stove that is driven at a predetermined high speed higher than a predetermined low speed. When the output of the thermocouple is reduced to a control threshold value that is greater than the fire extinguishing detection threshold value and smaller than the thermal power adjustment unit position determination threshold value during execution of the small thermal power reduction control, the control unit reduces the small thermal power reduction value. The gas stove according to claim 1, wherein the gas stove is configured to stop the control. A cancellation command means for issuing a cancellation command for the small heating power reduction control;
When the small thermal power reduction control command is commanded by the minimum thermal power reduction permission command unit, the control unit continuously executes the small thermal power reduction control until the cancellation command is issued by the cancellation command unit The gas stove according to claim 1 or 2, wherein the heating power of the stove burner is adjusted to a heating power smaller than the set minimum heating power.   The gas stove according to any one of claims 1 to 3, wherein the control means is configured to notify that the small heating power reduction control is being executed.

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