JP6373431B2 - Gas stove - Google Patents

Description

  The present invention relates to a gas stove configured to heat a food by burning gas as fuel in a burner.

  In the gas stove, for example, as shown in Patent Document 1, a large fire channel and a small fire channel are provided in parallel in the middle of the gas channel, A latching solenoid valve for switching between large thermal power and small thermal power is installed, and when the latching solenoid valve for switching between large thermal power and small thermal power is opened, it becomes large thermal power, and the latching type for switching between large thermal power and small thermal power There is a gas stove configured to have a small heating power when the solenoid valve is closed.

  In the gas stove of this patent document 1, since the passage resistance of the gas amount adjusting unit for switching the heating power of the stove burner between the large heating power and the small heating power is switched by opening and closing the latch type electromagnetic valve, for example, in the middle of the gas flow path A gas stove can be configured at a lower cost compared to a case in which a closing member that increases or decreases the amount of gas passing through the provided opening is driven by a motor such as a stepping motor to switch the magnitude of the thermal power.

  Further, in Patent Document 1, the latch electromagnetic valve is opened in a standby state where no heating is performed by the heating unit, and when the cooking container is not detected by the container detection unit in the standby state, the heating / stopping manual operation unit performs heating. A configuration is described in which the latch solenoid valve is closed when the start operation is performed. When such a configuration is provided, the latch solenoid valve may be operated less frequently, saving power. It is said that it can be achieved.

  However, in a gas stove as in Patent Document 1, when switching from a small thermal power state in which the latching solenoid valve is closed to a large thermal power state in which the latching solenoid valve is opened, a valve body provided in the latching solenoid valve is used. The position changes rapidly over time. And when the position of the valve body provided in the latch type solenoid valve changes suddenly with the passage of time, the passage resistance of the gas amount adjusting unit that switches the heating power of the cono burner between large heating power and small heating power suddenly decreases Therefore, the flow rate of the fuel gas supplied to the combustor suddenly changes from a small flow rate to a large flow rate.

  Then, when the flow rate of the fuel gas supplied to the stove burner suddenly changes from a small flow rate to a large flow rate, the follow-up of the primary air supply to the stove burner with respect to the sudden increase in the fuel gas supply amount to the stove burner may be delayed. is there. Due to this follow-up delay, the state of the fuel gas supplied to the flame hole portion of the burner temporarily becomes a so-called gas rich state in which the ratio of primary air to the fuel gas is reduced. In addition, when the fuel gas in the gas rich state forms a flame in the flame hole portion of the burner, the combustion speed of the fuel gas in the gas rich state is such that the ratio of the primary air to the fuel gas is in an appropriate state. Due to the slowness compared to the combustion speed, the flame formed in the flame hole portion of the burner may become temporarily large. And when the flame formed in the flame hole part of a stove burner becomes large temporarily, there exists a possibility that what is called a flame overflow may arise, and the improvement was desired.

JP 2011-47531 A

  The present invention has been made in view of the above circumstances, and even when the passage resistance of the gas amount adjusting portion for switching the heating power of the conoburner between a large heating power and a small heating power suddenly decreases, It aims at providing the gas stove which can suppress generation | occurrence | production of what is called a flame overflow in which the flame formed in a part becomes large temporarily.

In order to achieve the above object, the gas stove of the present invention comprises:
A gas nozzle having a nozzle hole for gas ejection;
A tubular gas supply path connected to the gas nozzle and supplying fuel gas to the gas nozzle;
A mixing unit that mixes the fuel gas ejected from the gas nozzle and the combustion air sucked by the ejector effect caused by the ejection of the fuel gas, and a flame forming unit that burns the air-fuel mixture mixed in the mixing unit A stove burner having
Is disposed upstream of the gas supply channel of the tubular, in gas stove with a gas amount adjusting unit for adjusting the flow rate of the fuel gas flowing into the gas supply channel of the tubular by increasing or decreasing the passage resistance of the fuel gas ,
In the inside of the tubular gas supply path between the first connection part that connects the gas amount adjusting part and the tubular gas supply path, and the second connection part that connects the tubular gas supply path and the gas nozzle. A passage cross-sectional area reduction body for reducing a cross-sectional area of the fuel gas flowing from the first connection portion toward the second connection portion is provided in the tubular gas supply path in the fuel gas flow direction. Arranged along the
The passage cross-sectional area reduction body is a coil spring-like flexible body made of a flexible material and disposed in the tubular gas supply path along the tubular gas supply path . The fuel gas that has passed through the first connection portion passes through the space that is not occupied by the flexible body in the tubular gas supply path, and then passes through the second connection portion and is supplied to the gas nozzle. It is characterized by being configured.

As described above, the gas stove of the present invention connects the gas amount adjusting unit and the tubular gas supply path in the gas stove including the gas nozzle, the tubular gas supply path, the stove burner, and the gas amount adjusting part. Passage of fuel gas flowing from the first connection portion toward the second connection portion in the tubular gas supply passage between the first connection portion and the second connection portion connecting the tubular gas supply passage and the gas nozzle. Since the cross-sectional area reduction body that reduces the cross-sectional area is arranged along the flow direction of the fuel gas, the tubular gas supply passage when the burner thermal power is switched from small thermal power to large thermal power Until the internal pressure reaches the steady-state pressure at the time of large thermal power, the flow rate of the fuel gas ejected from the gas nozzle is larger than the steady-state flow rate at the time of large thermal power. become. In addition, by providing the reduced cross-sectional area, the volume in the tubular gas supply path is reduced, the time during which overshooting occurs is shortened, and the flame formed in the flame forming part of the conoburner is in an appropriate state It becomes possible to suppress the spreading of flames that spread further.
Further, as the passage cross-sectional area reduction body , a coil spring-like flexible body made of a flexible material and disposed in the tubular gas supply path along the tubular gas supply path is used. Therefore, it is possible to configure a reduced cross-sectional cross-sectional area having a sufficient function with a simple configuration.
In addition, since a coil spring-shaped passage cross-sectional area reduction body made of a flexible body is used as the passage cross-section reduction body , even when the gas supply pipe in which the flexible body is disposed is not a straight pipe, It is preferable because it can be easily disposed inside the gas supply pipe.

It is a perspective view showing the whole gas stove composition concerning one embodiment of the invention with which the present invention relates. It is a front view which shows the cooking setting part of the gas stove concerning one Embodiment of the invention with which this invention relates. It is a figure explaining the gas supply to the stove burner and grill burner of the gas stove concerning one Embodiment of the invention with which this invention relates. It is a schematic sectional drawing which shows the gas valve block of the gas stove concerning one Embodiment of the invention with which this invention relates. It is sectional drawing of the stove burner of the gas stove concerning one Embodiment of the invention with which this invention relates. It is a partially cutaway sectional view showing a tubular gas supply path and gas nozzle of a gas stove according to an embodiment of the invention to which the present invention relates. It is a partially cutaway sectional view showing a tubular gas supply path and gas nozzle of a gas stove according to an embodiment of the present invention.

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

[Embodiment 1]
First, the gas stove concerning one Embodiment (Embodiment 1) with which the present invention relates is demonstrated, referring an accompanying drawing. In addition, the gas stove concerning this Embodiment 1 is a built-in type gas stove provided with the stove part and the grill.

  As shown in FIG. 1, the gas stove 1 according to the first embodiment is provided with a plurality of heating units 2 on a top plate 11 constituting the top surface portion thereof. In the first embodiment, as shown in FIG. 1, a stove part 2 a provided with a high-heat-power stove burner 31 is provided as a heating part 2 on the left side and the right side. On the upper surface of the top plate 11, the virtues 21 are provided centering on each of the stove burners 31. The stove part 2a as 2 is comprised.

  The ignition device 23 includes one input circuit (including the primary winding of the high voltage transformer) and one output circuit (secondary winding of the high voltage transformer) for each burner. By energizing the input circuit, a high voltage is generated in each output circuit (secondary winding of the high-voltage transformer), and a high voltage for ignition discharge is supplied to all the burners.

As shown in FIG. 5, each stove section 2 a is provided with a container detection means 25 for detecting a cooking container placed on the virtues 21 and a temperature sensor 26 for detecting the temperature of the lower surface of the cooking container. Yes.
The container detection means 25 is comprised by the support part 25a fixed to the gas stove 1, the movable part 25b supported by the support part 25a so that a vertical movement is possible, and the detection switch 25c which detects the vertical position of the movable part 25b. Has been.

  The movable portion 25b is biased upward by a biasing means (not shown) such as a spring, and its upper end portion is configured to protrude upward from the five virtues 21. When the cooking container is placed on the virtues 21 in this state, the upper end of the movable part 25b is pushed down to the lower surface of the cooking container, and the downward movement is detected by the detection switch 25c as the movable part 25b is moved downward. Is recognized by a control unit (not shown). And the temperature sensor 26 is provided in the upper end part of the movable part 25b, and when the cooking container is mounted on Gotoku 21, the temperature sensor 26 contacts the lower surface of the cooking container and detects the temperature. The set temperature is recognized by the control unit.

  Moreover, the gas stove 1 is provided with a grill 2b as a heating unit 2 as shown in FIG. The grill 2b includes a grill box formed in the center of the main body of the gas stove 1, a grill burner (not shown) as heating means provided in the grill box, an ignition device 23, and an ignition detection device 24. The front end of the grill 2b is open to the front surface portion 12 of the gas stove 1, and is configured to be opened and closed by the grill door 28.

  The ignition detection device 24 is composed of a thermocouple provided in the stove burner 31 and the grill burner, and when ignited, the thermoelectromotive force generated by the heat of the flame is recognized by the control unit.

As shown in FIG. 1, front panel P1 and P2 which comprise the front part 12 of the gas stove 1 with the grill door 28 are provided on both sides of the grill door 28, and on the upper side of the left front panel P1, the left side A point fire extinguishing button 14a for igniting / extinguishing the stove burner 31 is provided. Further, a fire extinguishing button 14b for igniting / extinguishing the grill burner and a fire extinguishing button 14c for igniting / extinguishing the right burner 31 are provided from the upper left side of the right front panel P2. These point fire extinguishing buttons 14 (14a to 14c) constitute a heating / stopping manual operation unit for manually starting / stopping heating in the heating unit 2.
Further, on the front surface portion 12, a heating power adjustment lever 15 (15a to 15c) serving as a heating amount manual operation unit for manually adjusting the heating amount of each heating unit 2 is provided on each point fire extinguishing button 14a to 14c, respectively. Is provided.

  As shown in FIGS. 3 and 4, the gas valve block 6 includes an internal gas flow path 61, an introduction port 61 a serving as an upstream end of the gas flow channel 61, and a discharge port 61 b serving as a downstream end. And are provided.

The internal gas flow path 61 is provided with a valve hole for the safety valve 62 and a valve hole for the main valve 63 from the upstream side. On the downstream side of the valve hole for the main valve 63, a large-fire channel 61c and a small-fire channel 61d are provided in parallel, and the large-fire channel 61c is used for switching between large and small thermal powers. A valve hole for the latch type electromagnetic valve LB1 is provided, and a valve hole for the latch type electromagnetic valve LB2 is provided in the small fire channel 61d.
The large-fire channel 61c and the small-fire channel 61d merge on the downstream side of the valve hole of the latch-type solenoid valve LB1 and the small-fire orifice of2 located on the downstream side of the latch-type solenoid valve LB2. Further, a valve hole for the flow rate control valve 65 interlocked with the heating power adjustment lever 15 is provided on the downstream side.

  Incidentally, when the fire extinguishing button 14 is operated when the cooking container is not detected by the container detection means 25 described above, the latch type electromagnetic valve LB1 and the latch type electromagnetic valve LB2 are closed by the control unit, and heating is performed. Container detection control is performed so as not to start. Thereby, when the cooking container is not mounted on the five virtues 21, it is possible to prevent a flame from being formed on the stove burner 31.

  Further, the gas flow path 61 is provided with a bypass flow path BP that bypasses a portion where the latch type electromagnetic valve LB1 and the latch type electromagnetic valve LB2 are provided, and a bypass orifice of1 is provided in the bypass flow path BP. It has been. The bypass orifice of1 is provided to share a plurality of gas valve blocks 6, and may be opened when the gas valve block 6 is used for application to other models. In FIG. 2, the bypass orifice of1 is closed by a closing body (not shown).

  When the heating power adjustment lever 15 is set to a position between medium and large fires, the heating power of the combustor 31 depends on the combination of opening and closing of the latching solenoid valve LB1 and the latching solenoid valve LB2. Adjustment control is performed by the control unit in a manner as shown in the following table (Table 1).

  The latch-type solenoid valves LB1 and LB2 shift to an open state by energizing a pulse current having a polarity for opening the valve, and then maintain the open state even after the energization is stopped. It shifts to a closed state by energizing a pulse current having a polarity opposite to that of the current), and thereafter, the closed state is maintained even after the energization is stopped. At this time, the pulse width of the current is set to 200 to 300 milliseconds, and power is saved even when the heating power of the stove is maintained in various states. Therefore, it is particularly suitable when a dry battery is used as the power source of the device. Used.

  The downstream side of the valve hole for the flow rate control valve 65 reaches the outlet 61b for supplying gas to the burner 31. A slider 66 is attached to the instrument plug main body 60 so as to be movable in the front-rear direction. The slider 66 is pushed rearward by a child lock slide portion (not shown) incorporated in the point-extinguishing button 14. It is configured to move backward.

  The point-extinguishing button 14 in which the child lock slide portion is incorporated is provided so as to freely move back and forth, and the portion above the portion pressed by the finger of the point-extinguishing button 14 is pivotally supported on the stove body side. The portion pressed by the finger moves back and forth, and presses the front end surface of the slider 66 backward. The slider 66 is provided with a switching mechanism (not shown) for switching between a front position and a rear position, for example, an existing heart-shaped cam, and the slider 66 is moved to the rear position every time the fire extinguishing button 14 is pressed. The front position and the rear position are switched to be held by moving forward from the front position and being positioned at the front position or retreating from the front position and positioned at the rear position.

  Further, a valve rod 67 that moves forward and backward as the slider 66 advances and retracts is provided. The distal end side of the valve rod 67 is inserted into the gas flow path 61, and the distal end portion is inserted through the valve hole for the main valve 63 and the valve hole for the safety valve 62 from the rear side, that is, from the downstream side to the upstream side. Yes.

When the slider 66 switches from the front position to the rear position, the valve rod 67 temporarily moves backward to the rearmost position behind the rear position and then moves forward to the rear position. The valve body for the safety valve 62 is opened by moving the valve body of the safety valve 62 closing the valve hole for the upstream side from the upstream side to the upstream side.
The safety valve 62 is composed of an electromagnetic valve, and the valve body for the safety valve 62 is closed from the rear when the valve body moves forward, that is, downstream, and the valve hole for the safety valve 62 that is moved backward, that is, upstream. Is released.

  The safety valve 62 is kept open by the control unit only when a flame is detected by the ignition detection device 24, and when the flame is no longer detected, the maintenance of the open state by the control unit is stopped and closed. As a result, the fuel gas can be prevented from flowing out when it disappears due to boiling or wind and the flame of the ignition detection device 24 is no longer detected. Further, when the temperature of the lower surface of the cooking container detected by the temperature sensor 26 reaches a predetermined temperature (for example, 250 ° C.), it is determined that an abnormality such as airing or scorching has occurred, and the safety valve 62 is closed. . In this manner, the safety valve 62, the ignition detection device 24, and the temperature sensor 26 constitute an abnormality detection means.

  A main valve body that opens and closes a valve hole for the main valve 63 is provided in the middle of the valve rod 67. When the slider 66 is positioned at the front position, the main valve element closes the valve hole for the main valve 63 from the rear, and when the slider 66 is positioned at the rear position, the main valve element is for the main valve 63. The valve hole for the main valve 63 is opened behind the valve hole.

The opening of the valve hole for the flow rate control valve 65 is freely adjusted by the movement of the heating power adjustment needle 65a in the front-rear direction. The opening of the needle 65a is adjusted by operating the thermal power adjustment lever 15, and the supply amount of the fuel gas is increased as the thermal power adjustment lever 15 goes to the right.
In addition, an appliance plug switch (not shown) that is switched ON / OFF according to the position of the point fire button 14 or the slider 66 is provided. The appliance plug switch is turned OFF when the fire extinguishing button 14 (or the slider 66) is located at the front position, and turned on when it is located at the rear position (including the last position).

In order to light the stove burner 31 and the grill burner, the point fire extinguishing button 14 is pushed and the slider 66 is moved backward from the front position to the rear position. The valve rod 67 retracted together with the slider 66 opens the safety valve 62 and the main valve 63, and the fuel gas is supplied to the stove burner 31 and the grill burner.
Further, when the slider 66 moves backward, the appliance plug switch is turned on, the power supply to the control unit is turned on, and the control unit starts operating.

  When the point-extinguishing button 14 is pushed and heating is started, a desired heating power is obtained by operating the heating power adjustment lever 15. Note that the heating power adjusting lever 15 of the stove section 2a having the left stove burner 31 operates when the operation section of the stove section 2a is operated to ignite the fire power to the medium heating power side in conjunction with the operation of the operation section. It is comprised so that it may move, and it is comprised so that it may become a moderate heating power at the time of ignition.

  When the slider 66 is set to the front position, the main valve 63 is closed and extinguished, the appliance plug switch is turned OFF, the safety valve 62 is closed, and the output of the power holding signal is stopped, and the power supply to the control unit is completed.

  Next, automatic cooking will be described. On the lower side of the front panel on the left side of the gas stove 1, as shown in FIG. A cooking setting unit for grill is provided on the lower right side of the front panel on the right side of the gas stove 1, but details are not described in detail. A battery case 13 (FIG. 1) that houses a battery that serves as a power source for a control unit including a microcomputer is provided on the lower right side of the right front panel of the gas stove 1.

  The stove cooking setting unit 7 sets a cooking time with a set of auto menu setting unit 71 and auto menu display unit 72 for setting an automatic cooking menu (auto menu) for fried food, hot water, and rice cooking. A timer input unit 73 and a timer display 74 are provided.

  As the auto menu setting unit 71, a fried food switch 71a, a hot water switch 71b, and a rice cooking switch 71c are provided. The deep-fried food mode is an automatic cooking mode that automatically adjusts the heating power of the stove burner 31 so that the temperature set by the user is reached after the stove burner 31 is ignited. It is configured so that fried food cooking at a target temperature can be set from a plurality of types of fried food cooking such as ° C., 180 ° C., and 160 ° C., and the setting is displayed on the fried food display portion 72a.

  In addition, the hot water mode and the rice cooking mode are automatic cooking modes in which the burner 31 is burned under preset combustion conditions after the ignition of the burner 31 and the completion of the hot water and cooking is predicted automatically. is there.

  The hot water switch 71b is configured to select and set the mode of hot water such as automatic fire extinguishing, heat keeping for 5 minutes, whether to extinguish immediately after hot water or keep warm for a certain period of time. In addition, the setting is displayed on the hot water display portion 72b. In addition, the rice cooking switch 71c is configured so that a desired rice cooking mode can be set from a plurality of types of rice cooking modes such as rice and rice porridge by pressing it several times. The setting is configured to be displayed.

  The latch type solenoid valve LB1 will be described in detail by taking as an example a case where the deep-fried food mode is selected and the deep-fried food mode is executed by the control unit.

  When the deep-fried food switch 71a is pressed to select the deep-fried food mode and the combustor 31 is ignited, the control unit executes the deep-fried food mode, and the control unit sets the temperature of the cooking container detected by the temperature sensor 26. In order to maintain the set temperature (any one of 200 ° C., 180 ° C., and 160 ° C.), the latch type electromagnetic valve LB1 is opened and closed, and the heating power of the burner 31 is switched between the large heating power and the small heating power.

  More specifically, when the value of the temperature of the cooking container detected by the temperature sensor 26 is larger than the set temperature, the latch type electromagnetic valve LB1 is closed, and the small fire orifice of2 shown in FIGS. The gas is supplied to the stove burner 31 only from the small fire channel 61d provided with the stove burner 31, the heating power of the stove burner 31 becomes a small heating power, and the temperature at which the temperature of the cooking container detected by the temperature sensor 26 is set is set. When it is smaller, the latch type solenoid valve LB1 is opened, and the combustor is connected to both the small fire channel 61d having the small fire orifice of2 shown in FIGS. 3 and 4 and the latch type solenoid valve LB1. The gas is supplied to 31 and the heating power of the burner 31 becomes a large heating power.

  As described above, the gas stove 1 includes the gas nozzle 32 having the nozzle holes for gas ejection, and the gas nozzle 32 has a tubular gas supply path extending from the gas valve block 6 toward the gas nozzle 32. Fuel gas such as city gas and LP gas is supplied from 35 (FIG. 5).

  The stove burner 31 burns the mixing portion that mixes the fuel gas ejected from the gas nozzle 32 and the combustion air sucked by the ejector effect caused by the ejection of the fuel gas, and the air-fuel mixture mixed in the mixing portion. And a flame forming part.

As shown in FIG. 6, the gas nozzle 32 is fixed to the gas supply path 35 at a second connection portion 36 that is an end portion of a tubular gas supply path (hereinafter also simply referred to as “gas supply path”) 35. .
In addition, the first connection portion 33, which is the end portion of the gas supply path 35 opposite to the second connection portion 36, is connected to the gas valve block 6. It is connected to the outlet 61b. That is, on the upstream side of the gas supply path 35, the gas valve block 6 as a gas amount adjusting unit is disposed.

  As described above, the gas valve block (gas amount adjusting unit) 6 is a passage resistance of the fuel gas passing through the gas flow path 61 inside the gas valve block 6 by opening / closing the latch type electromagnetic valve LB1 or operating the heating power adjusting lever 15. The flow rate of the fuel gas flowing into the gas supply path 35 is adjusted by increasing / decreasing the gas flow rate, and has the following characteristic configuration.

  For example, when the latching solenoid valve LB1 is opened from the small heating power state where the latching solenoid valve LB1 is closed to shift to the large heating power state, the latching solenoid valve LB1 is closed and the gas in the low pressure state is closed. The latch-type electromagnetic valve LB1 is opened in the supply path 35, and the high-pressure fuel gas upstream from the latch-type electromagnetic valve LB1 flows suddenly. That is, in the small heating power state where the latch type electromagnetic valve LB1 is closed, the flow rate of the fuel gas ejected from the gas nozzle 32 is limited by the passage resistance of the fuel gas passing through the gas flow path 61 inside the gas valve block 6. On the other hand, in the state of a large heating power with the latch type solenoid valve LB1 opened, the flow rate of the fuel gas ejected from the gas nozzle 32 is limited by the passage resistance of the fuel gas passing through the nozzle hole of the gas nozzle 32. It will be.

  Therefore, the latch type electromagnetic valve LB1 is opened, and the high pressure fuel gas upstream from the latch type electromagnetic valve LB1 flows, so that the pressure in the gas supply path 35 is steady when the heating power is high. Over the entire transition time until the pressure rises to the state pressure, the fuel gas having a larger flow rate than the flow rate of the fuel gas in the steady state at the time of large heating power passes through the gas flow path 61 inside the gas valve block 6.

  When the fuel gas passes through the gas flow path 61 inside the gas valve block 6 over the entire transition time, the fuel gas obtains kinetic energy, and this kinetic energy causes the pressure in the gas supply path 35 to increase. Until the steady state pressure at the time of large thermal power is reached, an overshoot occurs in which the flow rate of the fuel gas ejected from the gas nozzle 32 becomes larger than the steady state flow rate at the time of large thermal power.

  Further, the ejector effect of sucking combustion air (primary air) by the fuel gas being ejected from the gas nozzle 32 in the mixing portion of the stove burner 31 has a large thermal power with a large flow velocity of the fuel gas ejected from the gas nozzle 32. Compared to the case, the flow rate of the fuel gas ejected from the gas nozzle 32 is smaller in the case of a small heating power, so that the mixing portion of the cono burner 31 is smaller than the appropriate primary air ratio in the case of a large heating power when the heating power is small. A mixture of fuel gas and air with a small air ratio is filled.

Then, from the state of the small heating power in which the mixing portion of the stove burner 31 is filled with the mixture of the fuel gas and the air whose primary air ratio is smaller than the appropriate primary air ratio at the time of the large heating power, the latch solenoid valve LB1. When the valve is opened and becomes a large heating power, a mixture of fuel gas and air having a primary air ratio smaller than the appropriate primary air ratio at the time of the large heating power burns in the flame forming portion of the stove burner 31, The combustion speed of the mixture of fuel gas and air whose primary air ratio is smaller than the appropriate primary air ratio at the time of thermal power is lower than the combustion speed of the mixture of fuel gas and air that is the appropriate primary air ratio at the time of large thermal power. Therefore, the flame is likely to spread in the flame forming portion of the stove burner 31.
Furthermore, combined with the above-mentioned overshoot in which the flow rate of the fuel gas ejected from the gas nozzle 32 is larger than the steady flow rate at the time of large heating power, the flame overflows more easily than the proper state in the flame forming portion of the stove burner 31. Will occur.

<Characteristic configuration>
In the gas stove 1 of the first embodiment, in order to suppress the above-described flame overflow, as shown in FIG. 6, in the tubular gas supply path 35 between the first connection portion 33 and the second connection portion 36, A passage cross-sectional area reducing body 37 for reducing the cross-sectional area of the fuel gas passing between the first connection part 33 and the second connection part 36 is provided.

More specifically, as shown in FIGS. 4 and 6, a tubular gas formed by plating the surface of the iron pipe, which extends from the outlet 61 b of the gas valve block 6 toward the gas nozzle 32. One end portion 37a of a flexible resin tube serving as a passage cross-sectional area reduction body 37 is connected to the second connection portion 36 of the supply passage 35 (FIG. 6) to which the gas nozzle 32 is fixed. . In addition, the other end 37b of the passage cross-sectional area reduction body (resin pipe) 37 (the end opposite to the one end 37a) is connected to the other end 37b with respect to the tubular gas supply path 35. The positioning part 34 for positioning is provided.

  In addition, the second connection portion 36 to which one end portion 37a of the passage cross-sectional area reduction body (resin pipe) 37 is connected has a passage cross-section reduction body for any fuel gas of LP gas or city gas ( An identification display for identifying whether the resin pipe 37 is connected to the second connection portion 36 is provided.

  With this configuration, the fuel gas that has passed through the first connection portion 33 passes through the second connection portion 36 after passing through the inside of the flexible cross-sectional area reduction body (resin pipe) 37. By being supplied to the gas nozzle 32, the cross sectional area of the fuel gas passing between the first connection portion 33 and the second connection portion 36 is reduced, and the passage between the first connection portion 33 and the second connection portion 36 is reduced. The volume of flowing fuel gas is reduced.

As a result, the flow rate of the fuel gas ejected from the gas nozzle 32 is large until the pressure in the tubular gas supply path 35 rises to a steady state pressure at the time of large thermal power when switching from small thermal power to large thermal power. The rise of the overshoot that becomes larger than the steady state flow rate at the time of thermal power becomes gentle.

Moreover, since the volume in the tubular gas supply path 35 is reduced by providing the passage cross-sectional area reduction body 37, the time during which overshoot occurs is shortened and formed in the flame forming portion of the stove burner 31. It is possible to suppress the occurrence of flame overflow, which is a phenomenon in which the flame spreads from an appropriate state.

In the first embodiment, since a flexible resin pipe is used as the passage cross-sectional area reduction body 37, a cross-sectional area having the above-described effects can be obtained without requiring a complicated structure. A reduction body 37 can be configured.
In addition, the other end 37b of the passage cross-sectional area reduction body (resin pipe) 37 is provided with a positioning portion 34 for positioning the other end 37b with respect to the tubular gas supply path 35. The position of the other end 37b of the cross-sectional area reduction body (resin pipe) 37 can be maintained at an appropriate position, and the occurrence of flame overflow can be suppressed.

As the fuel gas supplied to the gas stove 1, city gas and LP gas can be used, and the type of the cross-sectional area reduction body (resin pipe) 37 can be changed according to the type of fuel gas used. It is configured to be able to.
That is, the calorific value of LP gas is larger than that of city gas, and the consumption volume of fuel gas per hour during large thermal power is smaller than that of city gas. For example, when LP gas is used as fuel, By reducing the inner diameter of the passage cross-sectional area reduction body (resin pipe) 37 as compared with the case where gas is used as fuel, the effect of suppressing the flame overflow can be expressed better.

  In addition, it is comprised so that the effect which suppresses a flame overflow may be acquired appropriately according to the emitted-heat amount of the fuel gas supplied to the gas stove 1, and since appropriate combustion is ensured, passage cross-sectional area reduction Even if the inner diameter of the body (resin pipe) 37 is reduced, there is no problem that a desired thermal power cannot be obtained due to the large passage resistance by the resin pipe as the passage cross-sectional area reduction body 37.

Further, as described above, which fuel gas passage cross-sectional area reduction body (resin pipe) 37 is connected to the second connection portion 36 of the tubular gas supply path 35 is the second connection portion 36. Therefore, even if an opaque gas supply path in which the surface of an iron pipe is plated is used as the tubular gas supply path 35, the passage cross-sectional area inserted into the interior is reduced. The type of the body (resin pipe) 37 can be easily identified by the identification display, and the effect of suppressing the flame overflow can be appropriately obtained according to the type of fuel gas.

[Embodiment 2]
FIG. 7 is a view showing a state in which the coil spring-like passage cross-sectional area reduction body 37 used in the second embodiment which is an embodiment of the present invention is accommodated in the tubular gas supply path 35. In FIG. 7, the parts denoted by the same reference numerals as those in FIG. 6 indicate the same or corresponding parts.

In the first embodiment, which is an embodiment of the invention to which the present invention relates, the case where a flexible resin pipe is used as the passage cross-sectional area reduction body 37 has been described. In the second embodiment, as described above, a flexible body (coil spring-like member) having flexibility is used as the passage cross-sectional area reduction body 37.
That is, in the second embodiment, as shown in FIG. 7, as a flexible flexible body that functions as the passing cross-sectional area reducing body 37, a metal wire is processed into a spiral shape, or a resin is spiraled. A coil spring-like flexible body formed by injection molding into a shape is used.
In addition, the structure of another part is the same as that of the case of the gas stove of the said Embodiment 1 which is embodiment of the invention with which this invention relates.

  Even in the case of the configuration of the second embodiment including the passing cross-sectional area reduction body 37 (that is, a coil spring-like flexible body) configured as described above, the first connection is compared with the case where the flexible body is not provided. The passage cross-sectional area of the fuel gas flowing from the portion 33 toward the second connection portion 36 is reduced, and the volume of the fuel gas flowing between the first connection portion 33 and the second connection portion 36 is reduced.

As a result, after the pressure of the tubular gas supply channel 35 is increased to the steady state pressure during large thermal when switching to the large thermal from a small thermal, during large thermal pressure of the gas supply passage 35 of the tubular Since the rise of the overshoot that becomes larger than the steady-state pressure of the gas is moderate, and the volume of the tubular gas supply passage 35 is reduced by providing the passage cross-sectional area reduction body 37, the overshoot is simplified with a simple configuration. It is possible to shorten the time during which the chute is generated, and it is possible to suppress the occurrence of flame overflow in the flame forming portion of the stove burner 31.

  The present invention is not limited to the above-described embodiment, and is also applicable to a gas stove that does not include a latch valve and is configured such that the heating power can be switched from a small heating power to a large heating power only by operating the heating power adjustment lever. Is possible.

Moreover, in the said embodiment, whether the thing for fuel gas of LP gas or city gas is connected as the passage cross-sectional area reduction body 37 with respect to the 2nd connection part 36 of the tubular gas supply path 35. FIG. Although the identification display shown is performed, a configuration in which the identification display is not particularly performed on the second connection portion 36 is also possible.

  Moreover, in the said embodiment, although the positioning part 34 is provided in the other edge part 37b on the opposite side to the one edge part 37a of the passage cross-sectional area reduction body 37, it is set as the structure which is not provided with the positioning part 34. Is also possible.

  Moreover, in the said Embodiment 1 and 2, although the gas stove provided with the grill was shown, it is possible to apply this invention also to the gas stove which is not equipped with the grill.

  Furthermore, the present invention can be applied not only to a built-in type but also to a table-type table stove.

  The present invention is not limited to the above-described embodiments and modifications in other points, and various applications and modifications can be added within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Gas stove 2 Heating part 2a Stove part 2b Grill 6 Gas valve block (gas amount adjustment part)
7 Cooking Setting Unit for Stove 11 Top Plate 12 Front Part 13 Battery Case 14 Point Fire Extinguishing Button 15 Thermal Power Control Lever 21 Gotoku 23 Ignition Device 24 Ignition Detection Device 25 Container Detection Means 26 Temperature Sensor 28 Grill Door 31 Comb Burner 32 Gas Nozzle 33 First One connection part 34 Positioning part 35 Tubular gas supply path 36 Second connection part 37 Passage cross-sectional area reduction body 37a One end part of the passage cross-sectional area reduction body 37b The other end part of the passage cross-sectional area reduction body 60 Instrument plug body 61 Gas flow path 61a Inlet port 61b Outlet port 61c Large fire channel 61d Small fire channel 62 Safety valve 63 Main valve 65 Flow control valve 66 Slider 67 Valve rod BP Bypass channel LB1, LB2 Latch solenoid valve

Claims (1)

A gas nozzle having a nozzle hole for gas ejection;
A tubular gas supply path connected to the gas nozzle and supplying fuel gas to the gas nozzle;
A mixing unit that mixes the fuel gas ejected from the gas nozzle and the combustion air sucked by the ejector effect caused by the ejection of the fuel gas, and a flame forming unit that burns the air-fuel mixture mixed in the mixing unit A stove burner having
Is disposed upstream of the gas supply channel of the tubular, in gas stove with a gas amount adjusting unit for adjusting the flow rate of the fuel gas flowing into the gas supply channel of the tubular by increasing or decreasing the passage resistance of the fuel gas ,
In the inside of the tubular gas supply path between the first connection part that connects the gas amount adjusting part and the tubular gas supply path, and the second connection part that connects the tubular gas supply path and the gas nozzle. A passage cross-sectional area reduction body for reducing a cross-sectional area of the fuel gas flowing from the first connection portion toward the second connection portion is provided in the tubular gas supply path in the fuel gas flow direction. Arranged along the
The passage cross-sectional area reduction body is a coil spring-like flexible body made of a flexible material and disposed in the tubular gas supply path along the tubular gas supply path . The fuel gas that has passed through the first connection portion passes through the space that is not occupied by the flexible body in the tubular gas supply path, and then passes through the second connection portion and is supplied to the gas nozzle. A gas stove characterized by being configured to be configured as described above.

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