JP6084525B2 - Gas stove - Google Patents

Description

The present invention relates to a gas stove, and more specifically, a heating unit having a stove burner, a gas flow path for supplying gas to the stove burner, a latch electromagnetic valve disposed in the gas flow path, The present invention relates to a gas stove including a control unit that controls energization of a latch electromagnetic valve.

  As such a gas stove, a large-fire channel and a small-fire channel are provided in parallel in the middle of the gas channel, and a large-fire / small-fire-switching latch solenoid valve is provided in the large-fire channel. It is arranged so that when the latch type solenoid valve for switching between large and small thermal power is opened, it becomes large thermal power, and when the latch type solenoid valve for switching between large and small thermal power is closed, it becomes small thermal power. A gas stove configured as described above is known (see, for example, Patent Document 1).

  In the gas stove of Patent Document 1, the large heating power and the small heating power are switched by opening and closing the latch type electromagnetic valve. For example, a closing element that increases or decreases the amount of gas passing through an opening provided in the middle of the gas flow path is provided. Compared with the case where the heating power is switched by switching with a motor such as a stepping motor, the gas stove can be configured at a lower cost.

  In addition, the latch type solenoid valve energizes the coil for driving the latch type solenoid valve when the latch type solenoid valve is driven from closed to open or from open to closed, and the latch type solenoid valve is opened from closed or After driving from open to closed, the open state or the closed state is maintained even when the energization is stopped, so that the power consumption of the gas stove can be suppressed.

JP 2011-047531 A

  However, in the gas stove as in Patent Document 1, since the response speed of the latch type solenoid valve is fast, the state is switched from a large thermal power state where the latch type solenoid valve is opened to a small thermal power state where the latch type solenoid valve is closed. In this case, the position of the valve body provided in the latch type solenoid valve changes instantaneously, and the heating power of the cono burner changes suddenly from a large heating power to a small heating power. Due to a delay in the follow-up of the primary air supply to the burner, the amount of primary air supplied to the burner becomes excessive, and the flame formed in the burner blows when suddenly changes from large to small firepower. There was a risk of disappearance, and improvements were desired.

  The present invention has been made in view of the above, and there is a problem that the flame of the stove burner is blown out due to the instantaneous change in the position of the valve body of the latch type electromagnetic valve disposed in the gas flow path. The purpose is to suppress.

(1) A gas stove according to the present invention includes a heating unit having a stove burner, a gas flow path for supplying gas to the stove burner, a latch electromagnetic valve disposed in the gas flow path, and a latch type In a gas stove comprising a control unit that controls energization of the solenoid valve,
The latch solenoid valve includes a movable magnetic body to which a valve body that opens and closes the gas flow path is fixed, a permanent magnet that attracts the movable magnetic body in a direction in which the valve body is closed, and the movable magnetic body. The energizing member that energizes the magnetic body in the direction in which the valve body opens, and the energization is controlled by the control unit, and the movable magnetic body is opened by the magnetic force generated by the energization. Or a coil that moves in the valve closing direction,
By energizing the coil with a valve opening current in a closed state in which the valve body is closed, the movable magnetic body moves to shift to a valve opened state in which the valve body is opened, and the valve opening current After the energization is stopped, the valve opening state is maintained when the urging force by the urging member exceeds the attraction force by the magnetic force of the permanent magnet, and the valve closing current is energized to the coil in the valve opening state. The movable magnetic body moves to move to the valve-closed state, and after the energization of the valve-closing current is stopped, the attraction force due to the magnetic force of the permanent magnet exceeds the urging force of the urging member, thereby closing the valve. Configured to maintain the valve state,
By energizing the coil with a valve closing intermediate current having an absolute value smaller than the valve closing current in the valve open state, an intermediate valve closing attractive force for sucking the movable magnetic body in the valve closing direction is obtained. And the biasing force by the biasing member maintains the sum and balance of the intermediate attractive force for valve closing and the attractive force by the magnetic force of the permanent magnet, and the opening degree of the valve body is set to the closed state and the valve closing state. It can be maintained at an intermediate opening when the valve is closed between the open state and
When closing the valve body in the open state, the control unit has a period from the start of energization to the coil to the valve closing current through the valve intermediate current, The energization is controlled so as to be longer than a predetermined period.

  In other words, the latching solenoid valve provided in the gas stove opens the valve opening of the latching solenoid valve by energizing the solenoid coil of the latching solenoid valve with a closing intermediate current whose absolute value is smaller than the closing current. An intermediate opening degree between the valve state and the valve closed state can be maintained at the valve closing time. Then, when closing the valve body of the latched solenoid valve in the valve-opened state, the control unit provided in the gas stove starts energizing the coil and then passes the intermediate current for valve closing to the valve closing current. The energization is controlled so that the period until it reaches a predetermined period or longer.

  With this configuration, when the valve body of the latched solenoid valve in the open state is closed, before the valve body is in the closed state, the closed state and the open state are maintained for a predetermined period. Since the valve opening is not changed suddenly from the open state to the closed state, a rapid decrease in the amount of gas supplied to the burner is suppressed.

  As described above, since the rapid decrease in the gas supply amount to the stove burner is suppressed, the stove caused by the delay in the follow-up of the primary air supply to the stove burner with respect to the sudden decrease in the gas supply amount to the stove burner. The blow-off of the flame of the stove burner due to excessive supply of primary air to the burner is suppressed.

(2) A gas stove according to the present invention includes a heating unit having a stove burner, a gas flow path for supplying gas to the stove burner, a latch solenoid valve disposed in the gas flow path, and a latch type In a gas stove comprising a control unit that controls energization of the solenoid valve,
The latch solenoid valve includes a movable magnetic body to which a valve body that opens and closes the gas flow path is fixed, a permanent magnet that attracts the movable magnetic body in a direction in which the valve body is closed, and the movable magnetic body. The energizing member that energizes the magnetic body in the direction in which the valve body opens, and the energization is controlled by the control unit, and the movable magnetic body is opened by the magnetic force generated by the energization. Or a coil that moves in the valve closing direction,
By energizing the coil with a valve opening current in a closed state in which the valve body is closed, the movable magnetic body moves to shift to a valve opened state in which the valve body is opened, and the valve opening current After the energization is stopped, the valve opening state is maintained when the urging force by the urging member exceeds the attraction force by the magnetic force of the permanent magnet, and the valve closing current is energized to the coil in the valve opening state. The movable magnetic body moves to move to the valve-closed state, and after the energization of the valve-closing current is stopped, the attraction force due to the magnetic force of the permanent magnet exceeds the urging force of the urging member, thereby closing the valve. Configured to maintain the valve state,
By energizing the coil with a valve closing intermediate current having an absolute value smaller than the valve closing current in the valve open state, an intermediate valve closing attractive force for sucking the movable magnetic body in the valve closing direction is obtained. And the biasing force by the biasing member maintains the sum and balance of the intermediate attractive force for valve closing and the attractive force by the magnetic force of the permanent magnet, and the opening degree of the valve body is set to the closed state and the valve closing state. It can be maintained at an intermediate opening when the valve is closed between the open state and
When closing the latched electromagnetic valve in the valve-opened state, the control unit gradually starts energizing the coil and then gradually increases the current value to the valve-closing current via the valve-closing intermediate current. The energization is controlled so as to change to

  With this configuration, when closing the valve body of the latched solenoid valve in the valve open state, the valve closing state between the valve closed state and the valve open state is set before the valve body is in the valve closed state. After the intermediate opening, the opening of the valve body gradually changes to a closed state, and the opening of the valve body does not change suddenly from the opened state to the closed state. Reduction is suppressed.

  As described above, since the rapid decrease in the gas supply amount to the stove burner is suppressed, the stove caused by the delay in the follow-up of the primary air supply to the stove burner with respect to the sudden decrease in the gas supply amount to the stove burner. The blow-off of the flame of the stove burner due to excessive supply of primary air to the burner is suppressed.

(3) A gas stove according to the present invention includes a heating unit having a stove burner, a gas flow path for supplying gas to the stove burner, a latch solenoid valve disposed in the gas flow path, and a latch type In a gas stove comprising a control unit that controls energization of the solenoid valve,
The latch solenoid valve includes a movable magnetic body to which a valve body that opens and closes the gas flow path is fixed, a permanent magnet that attracts the movable magnetic body in a direction in which the valve body is closed, and the movable magnetic body. The energizing member that energizes the magnetic body in the direction in which the valve body opens, and the energization is controlled by the control unit, and the movable magnetic body is opened by the magnetic force generated by the energization. Or a coil that moves in the valve closing direction,
By energizing the coil with a valve opening current in a closed state in which the valve body is closed, the movable magnetic body moves to shift to a valve opened state in which the valve body is opened, and the valve opening current After the energization is stopped, the valve opening state is maintained when the urging force by the urging member exceeds the attraction force by the magnetic force of the permanent magnet, and the valve closing current is energized to the coil in the valve opening state. The movable magnetic body moves to move to the valve-closed state, and after the energization of the valve-closing current is stopped, the attraction force due to the magnetic force of the permanent magnet exceeds the urging force of the urging member, thereby closing the valve. Configured to maintain the valve state,
By energizing the coil with a valve closing intermediate current having an absolute value smaller than the valve closing current in the valve open state, an intermediate valve closing attractive force for sucking the movable magnetic body in the valve closing direction is obtained. And the biasing force by the biasing member maintains the sum and balance of the intermediate attractive force for valve closing and the attractive force by the magnetic force of the permanent magnet, and the opening degree of the valve body is set to the closed state and the valve closing state. It can be maintained at an intermediate opening when the valve is closed between the open state and
When closing the latched solenoid valve in the open state, the control unit starts energizing the coil and then the current value is changed to the valve closing current through the valve closing intermediate current. The energization is controlled so as to change periodically.

  With this configuration, when closing the valve body of the latched solenoid valve in the valve open state, the valve closing state between the valve closed state and the valve open state is set before the valve body is in the valve closed state. After the intermediate opening, the opening gradually changes and the valve is closed, and the valve opening does not change suddenly from open to closed. Is suppressed.

  As described above, since the rapid decrease in the gas supply amount to the stove burner is suppressed, the stove caused by the delay in the follow-up of the primary air supply to the stove burner with respect to the sudden decrease in the gas supply amount to the stove burner. The blow-off of the flame of the stove burner due to excessive supply of primary air to the burner is suppressed.

  (4) In the gas stove according to claim 4, a bypass flow path provided with a gas flow restriction unit is connected in parallel to the gas flow path in which the latch type electromagnetic valve is disposed, and the control unit includes the latch The opening and closing of the valve body of the solenoid valve is controlled to switch the heating power of the combustor between a large heating power and a small heating power.

  That is, the bypass flow path provided with the gas flow restriction unit is connected in parallel with the gas flow path in which the latch electromagnetic valve is disposed. And it is comprised so that the thermal power of a conburner can be switched to a large thermal power and a small thermal power by opening and closing of the valve body of a latch type solenoid valve.

  When configured in this way, the heating power of the burner is switched between the large heating power and the small heating power by opening and closing the valve body of the latch type solenoid valve. For example, the gas passing through the opening provided in the middle of the gas flow path A gas stove can be constructed at a lower cost compared to a case in which a closing member for increasing or decreasing the amount is driven by a motor such as a stepping motor to switch the magnitude of the thermal power.

  That is, according to claim 4, a gas stove that can switch the heating power of the stove burner between a large heating power and a small heating power can be configured at a low cost, and a gas stove that preferably has the effects of claims 1 to 3 is provided. Can do.

  (5) The gas stove according to claim 5 includes a temperature detection unit that detects the temperature of the cooking container heated by the stove burner, and the control unit is configured to maintain the temperature of the cooking container at a predetermined set temperature. Based on the temperature detected by the temperature detection unit, the opening and closing of the valve body of the latch-type electromagnetic valve is controlled to switch the heating power of the burner to a large heating power and a small heating power.

  That is, the temperature detection part which detects the temperature of the cooking container heated with a stove burner is provided. Then, in order to maintain the temperature of the cooking vessel at a predetermined set temperature, the valve body of the latch-type solenoid valve is opened and closed based on the temperature detected by the temperature detection unit, and the heating power of the cono burner is switched between large heating power and small heating power. It is constituted so that it can be done.

  By configuring in this way, when the thermal power of the burner can be switched between the large thermal power and the small thermal power based on the detected temperature of the temperature detection unit, the configuration of claim 4 is preferably used to make a latch type It can be configured to be switched by opening and closing the valve body of the solenoid valve, and can be configured at low cost.

  That is, according to claim 5, the gas stove that can switch the heating power of the stove burner between the large heating power and the small heating power based on the temperature detected by the temperature detection unit can be configured at low cost, and the effect of claim 4 is suitably provided. It can be a gas stove.

  Among the present inventions, according to the inventions described in claims 1 to 3, a rapid decrease in the gas supply amount to the burner is suppressed, and the heating power of the burner is changed from a large heating power state to a small heating power state. Even when switched to, it becomes possible to provide a gas stove in which the flame of the stove burner is suppressed from blowing off.

  According to the fourth aspect of the present invention, a gas stove capable of switching the heating power of the stove burner between a large heating power and a small heating power can be configured suitably at low cost according to the present invention.

  According to the fifth aspect of the present invention, the gas stove capable of switching the heating power of the stove burner between the large heating power and the small heating power based on the temperature detected by the temperature detection unit can be configured at a low cost by the present invention.

It is the whole gas stove of one embodiment of the present invention. It is a front view of the cooking setting part for gas stoves same as the above. It is explanatory drawing of the gas supply to the stove burner and grill burner of a gas stove same as the above. It is a schematic sectional drawing of the gas valve block of a gas stove same as the above. It is sectional drawing of the stove burner of a gas stove same as the above. It is a schematic sectional drawing showing the valve opening state and valve closing state of the latch type solenoid valve of a gas stove same as the above. It is a figure which shows the relationship between the valve opening degree of a latch type solenoid valve same as the above, and the urging | biasing force of a spring, and the relationship between the valve opening degree of a latch type solenoid valve, and the attraction force by electricity supply to a magnet and a solenoid. It is a figure which shows the relationship between the applied voltage to the solenoid (coil) of a latch type solenoid valve same as the above, and the valve opening degree of a latch type solenoid valve. It is a figure which shows the relationship between the voltage applied to the solenoid (coil) of the latch type solenoid valve in the conventional gas stove, and the valve opening degree of a latch type solenoid valve. In this invention, it is a figure which shows another modification of a plunger lower end part and a core upper end part.

  Hereinafter, a gas stove according to an embodiment of the present invention will be described with reference to the accompanying drawings. As a gas stove according to an embodiment of the present invention, a built-in gas stove 1 including a stove part and a grill will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the top plate 11 constituting the top surface portion of the gas stove 1 is provided with a plurality of heating units 2. In this embodiment, as shown in FIG. 1, the stove part 2a provided with the high-combustion stove burner 31 as the heating part 2 is provided on the left side and the right side. On the upper surface of the top plate 11, the virtue 21 is provided centering on each of the combustors 31, and the combustor 31, the virtue 21, the ignition device 23 and the ignition detection device 24 (see FIG. 3) The stove section 2a is configured.

  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. . The container detection means 25 includes a support portion 25a fixed to the gas stove 1, a movable portion 25b supported by the support portion 25a so as to be movable in the vertical direction, and a detection switch 25c for detecting the vertical position of the movable portion 25b. Composed. The movable portion 25b is urged upward by an urging means (not shown) such as a spring, and the upper end of the movable portion 25b protrudes upward from the 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 by 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. Part (not shown). The temperature sensor 26 is provided at the upper end of the movable portion 25b, and when the cooking container is placed on the virtues 21, the temperature is detected by contacting the lower surface of the cooking container, and the detected temperature is recognized by the control unit. Is done.

  Moreover, the gas stove 1 is provided with a grill 2b as a heating unit 2 as shown in FIG. The grill 2b is composed of a grill box formed in the center of the gas stove 1 main body, 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 closed by the grill door 28 so as to be freely opened and closed.

  The ignition device 23 ignites a spark plug provided at the fuel gas discharge port of the burner 31 and the grill burner by a high-pressure pulse generated by an igniter (not shown). The igniter Controlled by

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

  As shown in FIG. 1, front panels P1 and P2 that constitute the front portion 12 of the gas stove 1 together with the grill door 28 are provided on both sides of the grill door 28, and the left side front panel P1 has a left side panel on the left side. A point-extinguishing button 14a for igniting / extinguishing the burner 31 is provided. On the upper side of the right front panel P2, a point-extinguishing button 14b for igniting / extinguishing the grill burner, A point fire extinguishing button 14c for extinguishing the fire is provided. These point fire extinguishing buttons 14 (14a to 14c) serve as a heating / stop 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. It is.

  FIG. 3 is an explanatory diagram of gas supply to the stove burner 31 and the grill burner of the gas stove 1, and FIG. 4 is a schematic cross-sectional view of the gas valve block 6 of the gas stove 1.

  In the gas valve block 6, the instrument plug body 60 is provided with an internal gas flow path 61, and an introduction port 61 a that is an upstream end of the gas flow path 61 and a discharge port 61 b that is a downstream end. 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 a latch for switching between large and small thermal powers. A valve hole for the solenoid valve LB1 is provided, and a valve hole for the latch solenoid 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, on the downstream side, a valve hole for the flow rate control valve 65 interlocking with the heating power adjusting lever 15 is provided.

  Incidentally, when the fire extinguishing button 14 is operated when the cooking container is not detected by the container detecting 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. The container detection control is performed so as not to start, and a flame is not formed on the stove burner 31 when no cooking container is placed on the virtues 21.

  Further, the gas flow path 61 is provided with a bypass flow path BP that bypasses the 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. is there. 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 thermal power adjustment lever 15 is set to a position between medium and large fires, the thermal power of the conoburner 31 depends on the combination of opening and closing of the latching solenoid valve LB1 and the latching solenoid valve LB2. As shown in Table 1 below, adjustment control is performed by the control unit.

なお、ラッチ式電磁弁ＬＢ１、ＬＢ２は、開弁用の極性のパルス電流の通電により開放状態に移行し、その後は通電を停止した後にも開弁状態を維持し、閉弁用の極性（開弁用とは逆極性）の電流の通電により閉弁状態に移行し、その後は通電を停止した後にも閉弁状態を維持する。このとき開弁用の電流のパルス幅は２００〜３００ｍ秒に設定されており、閉弁用の電流のパルス幅は、閉弁を確実に行うために開弁用の電流のパルス幅より長く、０．３秒から０．５秒に設定されており、コンロの火力を種々の状態に維持する場合にも省電力であるから、機器の電源として乾電池が用いられる場合に特に好適に用いられる。

The latch-type solenoid valves LB1 and LB2 shift to an open state when a pulse current having a polarity for valve opening is energized, and thereafter maintain the valve open state even after the energization is stopped. The valve is switched to a closed state by energization of a current having a polarity opposite to that for the valve), and thereafter the closed state is maintained even after the energization is stopped. At this time, the pulse width of the valve opening current is set to 200 to 300 milliseconds, and the pulse width of the valve closing current is longer than the pulse width of the valve opening current in order to reliably close the valve, It is set from 0.3 seconds to 0.5 seconds, and power is saved even when the stove heating power is maintained in various states. Therefore, it is particularly preferably used when a dry battery is used as a power source of the equipment.

  The latch type electromagnetic valve LB1 will be described in detail later.

  The downstream side of the valve hole for the flow control valve 65 leads to the outlet 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 has come to retreat.

  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 from the rear position each time the point extinguishing button 14 is pressed. It moves forward and is located at the front position, or retracts from the front position and is located at the rear position, and the front position and the rear position are switched and held.

  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 once moves backward to the rearmost position after 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 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.

  In the middle of the valve rod 67, a main valve body for opening and closing a valve hole for the main valve 63 is provided. 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.

  An instrument plug switch that is switched ON / OFF depending on the position of the point fire extinguishing 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. It should be noted that the heating power adjusting lever 15 of the stove section 2a provided with the left-side stove burner 31 is operated by operating the operation section of the stove section 2a so that the heating power is moved to the middle heating power side in conjunction with the operation of the operation section. It is designed to move and has a moderate heating power when ignited.

  When the sliders 66 of all the point fire extinguishing buttons 14 are set to the front position, the main valve 63 is closed and the fire is extinguished, the instrument plug switches S1 to S3 are turned off, the safety valve 62 is closed, and the output of the power holding signal is stopped. Thus, 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 right front panel of the gas stove 1, but details are not described in detail. A battery case 13 that houses a battery serving as a power source for the 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 a menu (auto menu) for frying, hot water and cooking rice (auto menu). Timer input unit 73 and timer display unit 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 possible to set fried food cooking at a target temperature from among 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 can be set by selecting a hot water heater that automatically extinguishes after hot water has been fired or whether to keep warm for a certain period of time, such as automatic fire extinguishing, 5-minute heat retention, and the setting is displayed on the hot water display 72b. It has come to be. In addition, the rice cooking switch 71c can set the cooking of the intended rice among a plurality of types of cooking such as rice and rice porridge, and the setting is displayed on the rice cooking display 72c. ing.

  The latch type electromagnetic 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. The configuration of the latching solenoid valve LB2 is the same as that of the latching solenoid valve LB1, and therefore detailed description of the latching solenoid valve LB2 is omitted in this document.

  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 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 temperature of the cooking container detected by the temperature sensor 26 is higher than the set temperature, the latch type electromagnetic valve LB1 is closed, and the small fire orifice of2 shown in FIGS. 3 and 4 is provided. When gas is supplied to the burner 31 only from the small fire channel 61d, the heating power of the burner 31 becomes a small heating power, and the temperature of the cooking container detected by the temperature sensor 26 is lower than the set temperature. Opens the latch type solenoid valve LB1, and from both the small fire flow path 61d having the bypass small fire orifice of2 and the latch type solenoid valve LB1 shown in FIG. 3 and FIG. Gas is supplied, and the heating power of the stove burner 31 becomes a large heating power.

  Next, as a feature of the present invention, driving of the latching solenoid valve LB1 and the latching solenoid valve LB1 by the control unit will be described below with reference to FIGS.

  FIG. 6 shows the closed state of the latching electromagnetic valve LB1 on the right side of the center line (one-dot chain line), and shows the opened state of the latching electromagnetic valve LB1 on the left side of the center line (one-dot chain line). The core 59, the plunger 52a as a movable magnetic body, the permanent magnet 55, and the yoke 56 constitute a magnetic circuit.

  A central portion of the solenoid (coil) 53 is disposed in such a manner that the core 59 and the plunger 52 a penetrate therethrough, and a yoke 56 is disposed on the outer peripheral side of the solenoid (coil) 53.

  In a state where the solenoid (coil) 53 is not energized, a magnetic force generated by the permanent magnet 55 is generated in the magnetic circuit in a direction in which the plunger 52a is attracted upward in FIG.

  By energizing the solenoid (coil) 53, a magnetic flux is generated in the magnetic circuit, and by energizing the solenoid (coil) 53 in the positive direction, a magnetic flux having a polarity opposite to that of the permanent magnet 55 is generated.

  By energizing the solenoid (coil) 53 in the reverse direction, a magnetic flux having the same polarity as the magnetic flux generated by the permanent magnet 55 is generated.

  As an example of the movable magnetic body, the plunger 52a has a non-magnetic connecting shaft 52b fastened to its upper end, and a valve body 51 fastened to the upper end of the non-magnetic connecting shaft 52b. . That is, the valve body 51 is fixed to the upper end side of the plunger 52a via the non-magnetic connecting shaft 52b. The spring 54 included in the latch type electromagnetic valve LB1 is inserted between the permanent magnet 55 and the plunger 52a as an example of an urging member, and opens the valve body 51 fixed to the plunger 52a. Energize in the direction (downward).

  In the closed state shown on the right side of FIG. 6, the plunger 52 a included in the latch type electromagnetic valve LB <b> 1 is attracted upward by the magnetic flux of the permanent magnet 55 and is attracted by the permanent magnet 55. The force is greater than the urging force of the spring 54 (the urging force in the direction of opening the valve body 51), and the valve closing state is maintained and the gas is shut off. In order to ensure contact between the valve body 51 and the valve seat 50 in the valve-closed state, as shown in FIG. 6, the permanent magnet 55 and the plunger 52a are not in contact with each other in the valve-closed state. It is composed.

  Further, in the valve open state shown on the left side of FIG. 6, the urging force by the spring 54 (the urging force in the direction in which the valve body 51 is opened) is applied by the permanent magnet 55 while the solenoid (coil) 53 is not energized. It is larger than the suction force, the valve open state is maintained, and gas can flow.

  When the solenoid (coil) 53 is energized with a valve opening current in the forward direction by the control unit in the closed state of the latch electromagnetic valve LB1, a magnetic flux having a polarity opposite to the magnetic flux generated by the permanent magnet 55 is generated. The biasing force by the spring 54 becomes larger than the attractive force by which the plunger 52a is attracted upward by the magnetic flux of the sum of the magnetic flux by the magnet 55 and the magnetic flux by energization of the valve opening current to the solenoid (coil) 53. The jar 52a moves downward, and the latch type electromagnetic valve LB1 reaches an open state.

  When the latching electromagnetic valve LB1 is in the open state, when the valve closing current I6 in the direction opposite to the normal valve opening current is supplied from the control unit to the solenoid (coil) 53, the magnetic flux generated by the permanent magnet 55 is increased. The magnetic force having the same polarity is generated, and the attraction force by which the plunger 52a is attracted upward by the magnetic flux of the sum of the magnetic flux by the permanent magnet 55 and the magnetic flux by the energization of the valve closing current to the solenoid (coil) 53 is the spring. 54, the plunger moves upward, and the latch type electromagnetic valve LB1 reaches the closed state.

  In the present embodiment, the controller controls the energization of the drive current to the solenoid (coil) 53 as follows when driving the latched electromagnetic valve LB1 in the valve open state to the valve closed state described above. To do. Note that when the control unit controls the energization of the driving current, the driving may be performed not only by a current source using a constant current circuit or the like but also by a voltage source using a constant voltage circuit or the like.

  The latch type electromagnetic valve LB1 applies the valve closing intermediate current smaller than the valve closing current I6 to the latch type electromagnetic valve LB1, thereby setting the opening degree of the latch type electromagnetic valve LB1 to the closed state and the open state. It is possible to maintain the intermediate opening during the closing of the valve, and this point will be described.

  FIG. 7 shows the valve opening (in the horizontal axis direction) of the latch type electromagnetic valve LB1 in this embodiment, the urging force S (in the vertical axis direction) by the spring 54, the energization of the latch type electromagnetic valve LB1, and the permanent magnet 55. The relationship between the attractive forces f1 to f6 (vertical direction) due to the sum of magnetic fluxes generated by the magnetomotive force is shown.

  As shown in FIG. 7, the urging force S by the spring 54 changes linearly with respect to the change in the opening of the valve body 51 according to the moving distance (stroke) of the plunger 52a.

  Further, attraction generated between the plunger 52 a and the permanent magnet 55 generated by the sum of magnetic currents generated by the energizing currents I <b> 2 to I <b> 6 to the solenoid (coil) 53 of the driving current controlled by the control unit and the magnetomotive force of the permanent magnet 55. The forces f2 to f6 are generally inversely proportional to the length of each gap present in the magnetic circuit (inversely proportional is not a simple inverse but actually a complex function that includes the inverse power of each gap. Since the plunger 52a approaches the permanent magnet 55 and the length of the gap becomes shorter as the latch-type electromagnetic valve LB1 approaches from the valve open state to the valve close state, the length of the gap becomes shorter. As shown in FIG.

  As shown in FIG. 6, when the plunger 52a is separated from the core 59, the plunger 52a and the core 59 are arranged so that the length of the gap between the plunger 52a and the core 59 is difficult to change. The protruding end portion 52a1 protruding from the lower end side of the plunger 52a is configured to enter a recess 59a formed on the upper end side of the core 59 so as to maintain the second separation distance 58b.

  6, the annular receiving surface 52a2 around the protruding end portion 52a1 of the plunger 52a is directly on the upper end portion of the peripheral wall 59b of the concave portion 59a of the core 59. In order to avoid contact, a nonmagnetic spacer may be interposed at the contact interface.

  Since the connecting shaft 52b positioned between the valve body 51 and the plunger 52a is made of a nonmagnetic material, the plunger 52a and the permanent magnet 55 become closer to the permanent magnet 55. And the plunger 52a is reliably attracted by the magnetic flux generated by the magnetomotive force of the permanent magnet 55. That is, the plunger 52 a is configured such that the magnetic potential energy in the gap between the plunger 52 a and the permanent magnet 55 is surely reduced as the distance from the permanent magnet 55 is approached.

  When the connection shaft 52b is made of a magnetic material, the distance (first separation distance 58a) between the connection shaft 52b and the permanent magnet 55 is kept constant regardless of the position of the plunger 52a. The plunger 52a can be configured such that the magnetic potential energy in the gap between the plunger 52a and the permanent magnet 55 is surely reduced as the plunger 52a approaches the permanent magnet 55. The first separation distance 58a between the connecting shaft 52b and the permanent magnet is easily changed by shifting the central axis of the plunger 52a to the left and right. Since it is difficult to keep constant regardless of the position of the plunger 52a, in this embodiment, the connecting shaft 52b is made of a non-magnetic material.

Referring to FIG. 7, the solenoid (coil) 53 is not energized, and an attractive force f <b> 1 is generated between the plunger 52 a and the permanent magnet 55 only by the magnetomotive force of the permanent magnet 55, and the solenoid (coil) 53 is energized. If the attractive forces f2 to f6 are generated between the plunger 52a and the permanent magnet 55 in response to the currents I2 to I6, the plunger 52a is biased downward by the biasing force S by the spring 54. The plunger 52a is moved upward by the attraction force fi (i = 1, 2, 3,...) Generated by energizing the current Ii (i = 2, 3,...) Or the magnetomotive force of the permanent magnet 55. Because it is sucked in the direction
fi> S
When the valve body 51 moves toward the valve seat 50, that is, when the valve body 51 moves upward (the valve closing direction) and the valve body 51 comes into contact with the valve seat 50, the valve body 51 Is closed and biased in a state where the valve seat 50 is in contact with the valve seat 50, and the gas is shut off.
fi <S
At this time, the plunger 52a moves in the direction in which the valve body 51 moves away from the valve seat 50, that is, in the downward direction (the valve opening direction).

Then, the energizing force S by the spring 54 and the energization of the current Ii (i = 2, 3,...) Or the attractive force fi (i = 1, 2, 3,...) Generated by the magnetomotive force of the permanent magnet 55.・) Is equal, that is,
fi = S
At this time, the plunger 52a does not move in either the direction in which the valve body 51 moves away from the valve seat 50 or the direction in which the valve body 51 approaches the valve seat 50, and the valve body 51 and the valve seat 50 Is a distance between the valve body 51 and the valve seat 50 when the latched electromagnetic valve LB1 is closed, and a distance between the valve body 51 and the valve seat 50 when the latched electromagnetic valve LB1 is opened. Will be maintained at a distance between.

  In other words, the latching solenoid valve LB1 applies the valve closing intermediate current smaller than the valve closing current to the latching solenoid valve LB1, thereby controlling the opening degree of the latching solenoid valve LB1 between the closed state and the opened state. Can be maintained at an intermediate opening when the valve is closed.

  In this embodiment, when closing the open solenoid valve LB1, the control unit starts energizing the solenoid (coil) 53 and then closes the valve via the valve closing intermediate current. The period until the current is reached is a predetermined period or longer.

  The predetermined period may be longer than the conventional energization period (pulse width) of the valve closing current from the start of energization, for example, 0.3 seconds or more, preferably 0.4 seconds or more, more preferably 0. 5 seconds or more.

  Further, this energization period is preferably short from the viewpoint of energy saving, for example, within 2 seconds, preferably within 1.5 seconds, and more preferably within 1 second.

In this embodiment, the control unit controls the current value to gradually increase to the valve closing current through the valve closing intermediate current after starting energization so that the absolute value thereof gradually increases.
This point will be described below.

  Referring to FIG. 7, in the fully open state, the latching solenoid valve LB1 maintains the fully open state without the plunger 52a moving because the attractive force f1 generated by the magnetomotive force of the permanent magnet 55 is smaller than the biasing force S by the spring 54. To do.

  However, when the control unit energizes the solenoid (coil) 53 with the valve closing intermediate current I2 in the direction opposite to the valve opening current in the fully open state of the latch type electromagnetic valve LB1, the energization and the magnetomotive force of the permanent magnet 55 are caused. Due to the suction force f2, f2> S is established, and the latch type electromagnetic valve LB1 has a position (intermediate position) corresponding to P1 in FIG. 7 where the plunger 52a is movable upward and the plunger 52a is moved slightly upward. At the position), f2 = S, and the valve opening at that time (the intermediate opening when the valve is closed) can be maintained.

  Then, the reverse valve closing intermediate current supplied to the latch type solenoid valve LB1 at the valve opening (intermediate opening during valve closing) at the position (intermediate position) corresponding to P1 is further changed from I2 to I3. When the current is increased to f3> S by the energization of the energizing current I3 to the solenoid (coil) 53 by the controller and the attractive force f3 due to the magnetomotive force of the permanent magnet 55, the latch type solenoid valve LB1 has the plunger 52a. Can move further upward, and f3 = S at the position (intermediate position) corresponding to P2 in FIG. 7 where the plunger 52a has moved further upward. Degree) can be maintained.

  Then, the reverse intermediate current for valve closing that is energized to the solenoid (coil) 53 of the latch type electromagnetic valve LB1 at the valve opening (intermediate opening when the valve is closed) at the position (intermediate position) corresponding to P2. When the current is increased from I3 to I4, f4> S is established by energization of the current (I4) to the solenoid (coil) 53 and the attractive force f4 due to the magnetomotive force of the permanent magnet 55, and the latch-type solenoid valve LB1 is The jar 52a can move further upward, and the position (intermediate position) corresponding to P3 in FIG. 7 where the plunger 52a has moved further upward becomes f4 = S, and the valve opening at that time (when the valve is closed) (Intermediate opening) can be maintained.

  Then, the reverse intermediate current for closing the valve, which is energized to the latch type electromagnetic valve LB1 at the valve opening (intermediate opening at the time of closing) corresponding to P3, is further changed from I4 to I5. As a result, f5> S is established by energizing the solenoid (coil) 53 with the current I5 and the attractive force f5 by the magnetomotive force of the permanent magnet 55, and the plunger 52a is further upward in the latch type electromagnetic valve LB1. 7 and f5 = S at the position (intermediate position) corresponding to P4 in FIG. 7 where the plunger 52a has moved further upward, and the valve opening degree (intermediate opening degree at the time of closing) is maintained. Is possible.

  As described above, the latching solenoid valve LB1 has the valve closing intermediate current Ii (i = 2, 3,...) Such that fi (i = 2, 3,...) = S in the latching solenoid valve LB1. ..) Can be energized to maintain the opening of the latch-type solenoid valve LB1 at an intermediate opening when the valve is closed between the closed state and the open state, but fi (i = 2, 3,. ..) = S, when the latching solenoid valve LB1 can stably maintain the intermediate opening when the valve is closed, and when the latching solenoid valve LB1 stably maintains the intermediate opening when the valve is closed. Note that in some cases, P1, P2, P3, and P4 described above may be fi (i) corresponding to the case where the latching solenoid valve LB1 can stably maintain the intermediate opening when the valve is closed. = 2, 3,...) = S.

  More specifically, the plunger 52a is moved to a position corresponding to P4 in FIG. 7 by energizing the solenoid (coil) 53 of the valve closing intermediate current I5 by the controller and the attractive force f5 by the magnetomotive force of the permanent magnet 55. Sometimes, f5 = S, and at P4 in FIG. 7, when the plunger 52a moves slightly upward due to disturbance or the like, the plunger 52a moves downward in the reverse direction because f5 <S. Therefore, the latching solenoid valve LB1 returns to the position corresponding to P4, and the latching solenoid valve LB1 can stably maintain the intermediate opening when the valve is closed.

  On the other hand, by the energization of the valve closing intermediate current I5 to the solenoid (coil) 53 and the attractive force f5 due to the magnetomotive force of the permanent magnet 55, the plunger 52a reaches the position corresponding to P5 in FIG. When moved, even if f5 = S, the valve opening at that time cannot be stably maintained. This is because, in P5 in FIG. 7, when the plunger 52a moves upward even a little due to a disturbance or the like, f5> S is satisfied, so that the plunger 52a further moves upward, and the latching solenoid valve LB1 reaches a fully closed state.

  That is, when the plunger 52a is located at a position corresponding to P4 in FIG. 7 due to energization of the solenoid (coil) 53 of the valve closing intermediate current I5 by the controller and the attractive force f5 due to the magnetomotive force of the permanent magnet 55, That is, when the plunger 52a is moved by a minute distance in the direction of the fully closed state of the latch solenoid valve LB1, the attractive force generated by energization of the drive current solenoid (coil) 53 and the magnetomotive force of the permanent magnet 55 is reduced. When the increment of the urging force S by the spring 54 is larger than the increment, the plunger 52a stays at that position, and the valve opening at that time (intermediate opening when closed) can be maintained. When the plunger 52a is located at a position corresponding to P5 in FIG. 7, that is, the plunger 52a is slightly moved in the direction of the fully closed state of the latching electromagnetic valve LB1. When the increase in the urging force S by the spring 54 is smaller than the increase in the attractive force generated by energizing the solenoid (coil) 53 for driving current and the magnetomotive force of the permanent magnet 55 when the distance is moved. The plunger 52a cannot remain in that position, and the valve opening at that time cannot be maintained.

  In other words, the latching solenoid valve LB1 in this embodiment has a fully closed state and a fully opened state in which the energizing force of the solenoid (coil) 53 and the attractive force due to the magnetomotive force of the permanent magnet 55 are equal to the biasing force S by the spring 54. When the plunger 52a interlocked with the valve body 51 is moved by a small distance in the direction of the fully closed state of the latch type electromagnetic valve LB1 at a valve opening that is an intermediate opening when the valve is closed. The current that is smaller than the valve opening current, ie, the valve closing, is such that the increase in the biasing force S by the spring 54 is larger than the increase in the attractive force generated by energization of the solenoid (coil) 53 and the magnetomotive force of the permanent magnet 55. An intermediate current will exist.

  In the latch type solenoid valve LB1 of the present embodiment, as described above, the intermediate current for closing is I2 and I3 greater than I2, I4 greater than I3, and I5 greater than I4. When the current is present and the latched solenoid valve LB1 in the open state is closed, the control unit gradually increases the energization current to the solenoid (coil) 53 via I2, I3, I4, and I5. Thereafter, the valve closing intermediate current I6 for generating the attractive force f6 is energized to gradually close the valve.

  The current supplied to the solenoid (coil) 53 at this time and the supply voltage to the corresponding solenoid (coil) 53, the position of the plunger 52a, the valve opening of the latch type electromagnetic valve LB1, and the latch type electromagnetic valve LB1 are passed. The relationship between the flow rate of the gas to be used is as shown in FIG. 8, for example.

  In FIG. 8, when the coil supply voltage is 3V, the valve opening current is supplied to the solenoid (coil) 53 of the latch type electromagnetic valve LB1, the latch type electromagnetic valve LB1 is opened, and when the coil supply voltage is 0V, When the solenoid (coil) 53 of the solenoid valve LB1 is not energized and the coil supply voltage is -3V, the valve closing current is supplied to the solenoid (coil) 53 of the latch solenoid valve LB1, and the latch solenoid valve LB1 is closed. It becomes a valve state.

  Then, in a range where the coil supply voltage is smaller than 0V and larger than −3V, the solenoids (coils) 53 of the latching solenoid valve LB1 are energized with the closing intermediate currents I2 to I6 smaller than the closing current, As described, the opening degree of the latch type electromagnetic valve LB1 is maintained at the intermediate opening degree when the valve is closed between the valve closing state and the valve opening state.

  In FIG. 8, at the plunger position, “upper” indicates that the latching solenoid valve LB1 is closed, and “lower” indicates that the latching solenoid valve LB1 is open. Further, in the valve opening, “fully open” means that the latching solenoid valve is fully open, and “fully closed” means that the latching solenoid valve LB1 is fully closed. In the gas flow rate, “maximum” indicates that the gas flow rate is maximum, and “0” indicates that the gas flow rate is minimum.

  In FIG. 8, when the coil supply voltage is set to 0V and the latched solenoid valve LB1 is maintained in the open state, the coil supply voltage gradually decreases from 0V to a negative value. Gradually increases, the plunger 52a gradually moves upward, and the opening of the latch solenoid valve LB1 gradually closes from fully open to fully closed. The gas supply amount to 31 is gradually suppressed in the decreasing direction.

  With the above-described configuration, the rapid decrease in the gas supply amount to the cono burner 31 is suppressed, and the follow-up of the supply of primary air to the cono burner 31 with respect to the rapid decrease in the gas supply amount to the cono burner 31 is delayed. As a result, the gas stove 1 is suppressed in which the blow-off of the flame of the stove burner 31 due to an excessive supply amount of primary air to the stove burner 31 is suppressed.

On the other hand, in a conventional latching solenoid valve that opens by applying a valve closing voltage stepwise to a driving coil, as shown in FIG. It changes instantaneously from a fully open state to a fully closed state in a stepped manner, and the amount of gas supplied to the burner increases rapidly.
[Another embodiment]
(1) In the above-described embodiment, the energization current to the solenoid (coil) 53 and the absolute value of the supply voltage to the solenoid (coil) 53 corresponding to the energization current are so-called lamp inputs that increase with time. However, the absolute value of the energization current to the solenoid (coil) 53 and the supply voltage to the solenoid (coil) 53 corresponding to this energization current may be increased in stages in a stepwise manner. .

  (2) In the above-described embodiment, the gas stove 1 has been described as the built-in type gas stove 1 provided with a grill. However, the gas stove 1 is a stationary table stove that is placed on a stove stand or the like. Also good. The grill does not have to be provided.

  (3) In the above-described embodiment, the latch type electromagnetic valve LB1 and the latch type electromagnetic valve LB2 are closed to shut off the gas supply to the combustor. It may be configured so that only the magnitude of the gas is switched by opening and closing the latch-type electromagnetic valve LB1.

  (4) In the above-described embodiment, the central portion of the solenoid (coil) 53 is arranged in such a manner that the core 59 and the plunger 52 a penetrate, and the yoke 56 is arranged on the outer peripheral side of the solenoid (coil) 53. The core 59 is omitted, and instead, the yoke 56 extends to the core 59, and the solenoid (coil) 53 is arranged in such a manner that the central portion of the solenoid 53 is penetrated by the yoke 56 and the extending portion of the yoke 56. You may let them.

  (5) In the above-described embodiment, the protruding end 52a1 on the lower end side of the plunger 52a enters the recess 59a formed in the core 59 so that the plunger 52a and the core 59 maintain the second separation distance 58b. However, as shown in FIG. 10, the lower end 52a2 of the plunger 52a and the upper end 59c of the core 59 are both flat, and for example, an annular nonmagnetic spacer 70 is provided on the upper end 59c of the core 59. It is good.

  10, the plunger 52a and the core 59 are separated from each other with a non-magnetic spacer 70 interposed therebetween in the valve open state shown on the left side of the center line (one-dot chain line) in FIG. 10 of the latch type electromagnetic valve LB1. ing. Thereby, in the open state of the latch type electromagnetic valve LB1, the gap between the plunger 52a and the core 59 is separated by the separation distance by the non-magnetic spacer 70, so that the magnetic resistance of the gap is large. .

  Therefore, in the transition from the valve open state shown on the left side of the center line (dashed line) of FIG. 10 of the latch type solenoid valve LB1 to the valve closed state shown on the right side of the center line (dashed line), the plunger 52a and the core 59 During this period, the magnetic resistance does not increase rapidly, and the latching electromagnetic valve LB1 can be gradually shifted from the open state to the closed state.

  Note that the shape of the spacer 70 is not limited to an annular shape, and may be any shape, such as a cylindrical shape.

DESCRIPTION OF SYMBOLS 1 Gas stove 24 Ignition detection apparatus 25 Container detection means 26 Temperature sensor 50 Valve seat 51 Valve body part 52a Plunger 52b Connecting shaft (nonmagnetic material)
53 Solenoid (coil)
54 Spring 55 Permanent magnet 56 Yoke 58a First separation distance 58b Second separation distance 59 Core LB1 Latching solenoid valve LB2 Latching solenoid valve S Spring biasing force

Claims (5)

A heating unit having a stove burner, a gas passage for supplying gas to the stove burner, a latching solenoid valve disposed in the gas passage, and a controller for controlling energization of the latching solenoid valve In a gas stove comprising
The latch solenoid valve includes a movable magnetic body to which a valve body that opens and closes the gas flow path is fixed, a permanent magnet that attracts the movable magnetic body in a direction in which the valve body is closed, and the movable magnetic body. The energizing member that energizes the magnetic body in the direction in which the valve body opens, and the energization is controlled by the control unit, and the movable magnetic body is opened by the magnetic force generated by the energization. Or a coil that moves in the valve closing direction,
By energizing the coil with a valve opening current in a closed state in which the valve body is closed, the movable magnetic body moves to shift to a valve opened state in which the valve body is opened, and the valve opening current After the energization is stopped, the valve opening state is maintained when the urging force by the urging member exceeds the attraction force by the magnetic force of the permanent magnet, and the valve closing current is energized to the coil in the valve opening state. The movable magnetic body moves to move to the valve-closed state, and after the energization of the valve-closing current is stopped, the attraction force due to the magnetic force of the permanent magnet exceeds the urging force of the urging member, thereby closing the valve. Configured to maintain the valve state,
By energizing the coil with a valve closing intermediate current having an absolute value smaller than the valve closing current in the valve open state, an intermediate valve closing attractive force for sucking the movable magnetic body in the valve closing direction is obtained. And the biasing force by the biasing member maintains the sum and balance of the intermediate attractive force for valve closing and the attractive force by the magnetic force of the permanent magnet, and the opening degree of the valve body is set to the closed state and the valve closing state. It can be maintained at an intermediate opening when the valve is closed between the open state and
When closing the valve body in the open state, the control unit has a period from the start of energization to the coil to the valve closing current through the valve intermediate current, Control energization to be over a predetermined period,
A gas stove characterized by that. A heating unit having a stove burner, a gas passage for supplying gas to the stove burner, a latching solenoid valve disposed in the gas passage, and a controller for controlling energization of the latching solenoid valve In a gas stove comprising
The latch solenoid valve includes a movable magnetic body to which a valve body that opens and closes the gas flow path is fixed, a permanent magnet that attracts the movable magnetic body in a direction in which the valve body is closed, and the movable magnetic body. The energizing member that energizes the magnetic body in the direction in which the valve body opens, and the energization is controlled by the control unit, and the movable magnetic body is opened by the magnetic force generated by the energization. Or a coil that moves in the valve closing direction,
By energizing the coil with a valve opening current in a closed state in which the valve body is closed, the movable magnetic body moves to shift to a valve opened state in which the valve body is opened, and the valve opening current After the energization is stopped, the valve opening state is maintained when the urging force by the urging member exceeds the attraction force by the magnetic force of the permanent magnet, and the valve closing current is energized to the coil in the valve opening state. The movable magnetic body moves to move to the valve-closed state, and after the energization of the valve-closing current is stopped, the attraction force due to the magnetic force of the permanent magnet exceeds the urging force of the urging member, thereby closing the valve. Configured to maintain the valve state,
By energizing the coil with a valve closing intermediate current having an absolute value smaller than the valve closing current in the valve open state, an intermediate valve closing attractive force for sucking the movable magnetic body in the valve closing direction is obtained. And the biasing force by the biasing member maintains the sum and balance of the intermediate attractive force for valve closing and the attractive force by the magnetic force of the permanent magnet, and the opening degree of the valve body is set to the closed state and the valve closing state. It can be maintained at an intermediate opening when the valve is closed between the open state and
When closing the latched electromagnetic valve in the valve-opened state, the control unit gradually starts energizing the coil and then gradually increases the current value to the valve-closing current via the valve-closing intermediate current. Control the energization to change to
A gas stove characterized by that. A heating unit having a stove burner, a gas passage for supplying gas to the stove burner, a latching solenoid valve disposed in the gas passage, and a controller for controlling energization of the latching solenoid valve In a gas stove comprising
The latch solenoid valve includes a movable magnetic body to which a valve body that opens and closes the gas flow path is fixed, a permanent magnet that attracts the movable magnetic body in a direction in which the valve body is closed, and the movable magnetic body. The energizing member that energizes the magnetic body in the direction in which the valve body opens, and the energization is controlled by the control unit, and the movable magnetic body is opened by the magnetic force generated by the energization. Or a coil that moves in the valve closing direction,
By energizing the coil with a valve opening current in a closed state in which the valve body is closed, the movable magnetic body moves to shift to a valve opened state in which the valve body is opened, and the valve opening current After the energization is stopped, the valve opening state is maintained when the urging force by the urging member exceeds the attraction force by the magnetic force of the permanent magnet, and the valve closing current is energized to the coil in the valve opening state. The movable magnetic body moves to move to the valve-closed state, and after the energization of the valve-closing current is stopped, the attraction force due to the magnetic force of the permanent magnet exceeds the urging force of the urging member, thereby closing the valve. Configured to maintain the valve state,
By energizing the coil with a valve closing intermediate current having an absolute value smaller than the valve closing current in the valve open state, an intermediate valve closing attractive force for sucking the movable magnetic body in the valve closing direction is obtained. And the biasing force by the biasing member maintains the sum and balance of the intermediate attractive force for valve closing and the attractive force by the magnetic force of the permanent magnet, and the opening degree of the valve body is set to the closed state and the valve closing state. It can be maintained at an intermediate opening when the valve is closed between the open state and
When closing the latched solenoid valve in the open state, the control unit starts energizing the coil and then the current value is changed to the valve closing current through the valve closing intermediate current. The energization is controlled so as to change
A gas stove characterized by that. The gas stove according to any one of claims 1 to 3,
A bypass flow path having a gas flow restriction unit is connected in parallel to the gas flow path in which the latch type electromagnetic valve is disposed, and the control unit controls opening and closing of the valve body of the latch type electromagnetic valve. A gas stove characterized by switching the heating power of the stove burner between a large heating power and a small heating power. The gas stove according to claim 4, wherein
A temperature detection unit that detects the temperature of the cooking container heated by the cooker is provided, and in order to maintain the temperature of the cooking container at a predetermined set temperature, the control unit is based on the detected temperature of the temperature detection unit. A gas stove that controls the opening and closing of the valve body of the latch-type electromagnetic valve to switch the heating power of the stove burner between a large heating power and a small heating power.

Images