JP6534266B2 - Gas stove - Google Patents

Description

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

  As such a gas stove, the flow path for the large fire and the flow path for the small fire are provided in parallel in the middle of the gas flow path, and the flow path for the large fire is a latch type solenoid valve for the large thermal power / small thermal power switching. When the latch type solenoid valve for large thermal power / small thermal power switching is opened, it becomes large thermal power, and it becomes small thermal power when the latch type solenoid valve for large thermal power / small thermal power switching closes. There is known a gas stove configured in (see, for example, Patent Document 1).

  In the gas stove of Patent Document 1, since the large thermal power and the small thermal power are switched by opening and closing the latch type solenoid valve, for example, a closure which increases or decreases the amount of gas passing through the opening provided in the middle of the gas flow path The gas stove can be configured at low cost as compared to the case where the power of the heating is switched by driving with a motor such as a stepping motor.

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

JP, 2011-047531, A

  However, in the gas stove as disclosed in Patent Document 1, when switching from the state of small thermal power in which the latch type solenoid valve is closed to the state of large thermal power in which the latch type solenoid valve is opened, the valve body provided in the latch type electromagnetic valve Since the position changes rapidly with the passage of time, and the power of the stove burner changes from small to large, the primary air supply to the stove burner follows the rapid increase in the gas supply to the stove burner. Due to the delay, yellow may temporarily occur in the flame of the stove burner temporarily, and the flame formed on the stove burner will suddenly spread when it changes rapidly from small thermal power to large thermal power. People were surprised, and improvement was desired.

  The present invention has been made in view of the above, and the occurrence of yellowing or burning of the flame of the stove burner due to the instantaneous change of the position of the valve body of the latch type solenoid valve disposed in the gas flow path The purpose is to suppress problems such as rapid spread.

  In order to achieve the above object, the present invention is configured as follows.

(1) The gas stove of the present invention comprises a heating unit having a stove burner, a gas flow path for supplying gas to the stove burner, a latch type solenoid valve disposed in the gas flow path, and the latch type And a control unit that controls energization of the solenoid valve.
The latch type solenoid valve includes: a movable magnetic body to which a valve body for opening and closing the gas flow path is fixed; a cylindrical accommodating portion for movably accommodating the movable magnetic body; and the movable magnetic body Energization is controlled by a permanent magnet that attracts the valve body in the valve opening direction, a biasing member that biases the movable magnetic body in the valve valve closing direction, and the control unit. And a coil configured to move the movable magnetic body in the valve opening direction or the valve closing direction along the cylindrical accommodating portion by a magnetic force generated by energization.
By supplying a valve opening current to the coil in a closed state in which the valve body is closed, the movable magnetic body is moved to shift to an open state in which the valve body is opened, and the valve opening current After the current supply is stopped, the valve opening state is maintained by the suction force by the magnetic force of the permanent magnet exceeding the biasing force by the biasing member, and the valve closing current is supplied to the coil in the valve opening state. The movable magnetic body moves to move to the valve closing state, and after the current supply for the valve closing is stopped, the closing force is caused by the biasing force of the biasing member exceeding the attraction force by the magnetic force of the permanent magnet. Configured to maintain the valve state,
On the outer peripheral surface of the movable magnetic body, a rubber member elastically contacting the inner peripheral surface of the housing portion except for a part in the circumferential direction is provided along the peripheral direction.
The control unit switches the polarity of a coil supply voltage supplied to the coil to positive or negative to control the valve opening current and the valve closing current in the coil.
When the movable magnetic body moves in the housing portion by the energization control, frictional resistance is generated between the rubber member on the outer peripheral surface of the movable magnetic body and the inner peripheral surface of the housing portion to move the movable magnetic body. The moving speed of the magnetic body in the valve opening direction and the valve closing direction is suppressed.

According to the present invention, the movable magnetic member to which the valve body is fixed when the valve body of the latch type solenoid valve in the valve closed state is opened and when the valve body of the latch type solenoid valve in the valve opened state is closed. However, while moving in the cylindrical housing portion in the valve opening direction and in the valve closing direction , the outer peripheral surface of the movable magnetic body is elastic on the inner peripheral surface of the housing except for a part in the circumferential direction. since the rubber member contacting is provided along the circumferential direction, when the movable magnetic body is moved over the tubular receptacle, the inner periphery of the rubber member and the housing portion of the outer peripheral surface of the movable magnetic body Frictional resistance occurs between the surfaces. For this reason, the moving speed of the movable magnetic body in the valve opening direction and the valve closing direction is suppressed, and the opening degree of the valve body rapidly changes from the valve closing state to the valve opening state and the valve closing state . The rapid increase and the rapid decrease of the gas supply to the stove burner are suppressed.

Thus, since the rapid increase in the gas supply to the stove burner is suppressed, the stove resulting from the delay in following the supply of the primary air to the stove burner to the rapid increase in the gas supply to the stove burner. While suppressing the yellowing of the flame of the burner, the rapid spread of the flame is suppressed. In addition, since the rapid decrease in the gas supply amount to the stove burner is suppressed, the moving speed of the plunger is suppressed even when the power of the stove burner is switched from the large thermal power state to the small thermal power state, The rapid decrease of the gas supply amount to the stove burner is suppressed, and the flame blowout of the stove burner caused by the delay in the follow-up of the supply of the primary air to the stove burner is suppressed.

(2) In a preferred embodiment of the present invention, an annular mounting groove is formed over the entire circumference of the outer peripheral surface of the movable magnetic body, and a plurality of spherical rubber members are connected to the mounting groove. A rubber member that elastically contacts the inner circumferential surface of the housing portion is mounted.

According to this embodiment, the frictional resistance generated between the rubber member and the inner circumferential surface of the housing portion balances the entire circumference of the movable magnetic body, and the movable magnetic body is cylindrical without deviation. Can be moved along the axis of the receptacle of the

(3) In another embodiment of the present invention, a plurality of mounting grooves are formed on the outer peripheral surface of the movable magnetic body at equal intervals along the circumferential direction, and the plurality of rubber members are a plurality of the above Each is mounted in the mounting groove.

According to this embodiment, since the movable magnetic body is provided with a plurality of rubber members at equal intervals along the circumferential direction, the frictional resistance generated between the rubber member and the inner circumferential surface of the housing portion is the movable magnetic The entire circumference of the body is well balanced, and the movable magnetic body can move along the axis of the cylindrical housing without being biased.

  (4) In a preferred embodiment of the present invention, a bypass flow passage provided with a gas flow rate limiting unit is connected in parallel to the gas flow passage in which the latch type solenoid valve is disposed, and the control unit is the latch The opening and closing of the valve body of the solenoid valve is controlled to switch the heating power of the stove burner to a large heating power and a small heating power.

  According to this embodiment, the bypass flow path provided with the gas flow rate limiting portion is connected in parallel to the gas flow path in which the latch type solenoid valve is disposed, and the thermal power of the stove burner is obtained by opening and closing the valve body of the latch type solenoid valve. However, since large thermal power and small thermal power can be switched, for example, the size of the thermal power is driven by driving a closing element that increases or decreases the amount of gas passing through the opening provided in the middle of the gas flow path by a motor such as a stepping motor. The gas stove can be configured at a lower cost than when configured to switch.

  That is, according to this embodiment, it is possible to configure at a low cost the gas stove that can switch the heat power of the stove burner to the large heat power and the small heat power, and suppress yellowing of the stove burner flame when switching the heat power. Spread can be suppressed.

  (5) In another embodiment of the present invention, the control unit includes a temperature detection unit that detects the temperature of the cooking vessel heated by the stove burner, and maintains the temperature of the cooking vessel at a predetermined set temperature. The present invention controls the opening and closing of the valve body of the latch type solenoid valve based on the temperature detected by the temperature detection unit, and switches the heating power of the stove burner to a large heating power and a small heating power.

  According to this embodiment, it is possible to configure at a low cost the gas stove which can switch the power of the stove burner to large thermal power and small thermal power at low cost based on the detected temperature of the temperature detection unit, and at the time of thermal power switching And the rapid spread of the flame can be suppressed.

According to the present invention, on the outer peripheral surface of the movable magnetic body which is accommodated in the cylindrical accommodating portion and movable in the valve opening direction and the valve closing direction , the inner peripheral surface of the accommodating portion except a part in the circumferential direction Since a rubber member that elastically contacts the valve is provided along the circumferential direction, when opening the valve body of the latch type solenoid valve in the valve closed state and the valve body of the latch type solenoid valve in the valve open state When the valve is closed , the moving speed of the movable magnetic body in the valve opening direction and the valve closing direction is suppressed by the frictional resistance generated between the rubber member of the movable magnetic body and the inner peripheral surface of the housing portion. Become.

  As a result, the valve body does not suddenly change from the valve closing state to the valve opening state, and a rapid increase in the gas supply amount to the stove burner is suppressed, and the stove burner for the rapid increase in the gas supply amount to the stove burner While suppressing the yellowing of the flame of the stove burner due to the delay in following the supply of the primary air to the burner, the rapid spread of the flame is suppressed.

It is a whole perspective view of the gas stove of one embodiment of the present invention. It is a front view of the cooking setting part of the gas stove of FIG. It is explanatory drawing of the gas supply to the stove burner of the gas stove of FIG. 1, and a grill burner. It is a schematic sectional drawing of the gas valve block of the gas stove of FIG. It is sectional drawing of the stove burner of the gas stove of FIG. It is a schematic sectional drawing showing the valve opening state and valve closing state of the latch type | mold solenoid valve of the gas stove of FIG. It is a horizontal sectional view of the principal part of the plunger of FIG. It is a time chart for demonstrating the operation | movement of the latch type solenoid valve of FIG. It is a time chart corresponding to Drawing 8 of a prior art example. FIG. 8 is a horizontal cross-sectional view corresponding to FIG. 7 of another embodiment. FIG. 16 is a horizontal cross-sectional view corresponding to FIG. 7 of still another embodiment.

  Hereinafter, a gas stove according to an embodiment of the present invention will be described with reference to the attached drawings. As a gas stove according to an embodiment of the present invention, a built-in gas stove 1 provided with a stove portion and a grill will be described based on the attached drawings.

  As shown in FIG. 1, a plurality of heating units 2 are provided on a top plate 11 constituting a top surface portion of the gas stove 1. In the present embodiment, as shown in FIG. 1, a stove portion 2 a provided with a high thermal power stove burner 31 as the heating portion 2 is provided on the left side and the right side. On the upper surface of the top plate 11, a vantage 21 is provided centering on each stove burner 31, and the heating unit is provided by the stove burner 31, the vantility 21 and the igniter 23 and the ignition detector 24 (see FIG. 3). The stove part 2a as 2 is comprised.

  The igniter 23 is provided with 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 of the output circuits (secondary windings 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 portion 2a is provided with a container detection means 25 for detecting the cooking container placed on the five-power 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 25a fixed to the gas stove 1, a movable part 25b supported movably in the vertical direction by the support 25a, and a detection switch 25c for detecting the vertical position of the movable part 25b. Configured The movable portion 25 b is urged upward by urging means (not shown) such as a spring, and the upper end portion thereof protrudes upward relative to the force 21. In this state, when the cooking vessel is placed on Gotoku 21, the upper end of the movable part 25b is pushed down by the lower surface of the cooking vessel, and the downward movement is detected by the detection switch 25c with the downward movement of the movable part 25b. It is recognized by a unit (not shown). Then, the temperature sensor 26 is provided at the upper end portion of the movable portion 25b, and when the cooking container is placed on the Viktor 21, it contacts the lower surface of the cooking container to detect the temperature, and the detected temperature is recognized by the control unit Be done.

  Further, as shown in FIG. 1, the gas stove 1 is provided with a grill 2 b as the heating unit 2. The grille 2b includes a grille storage formed at a central portion in the main body of the gas stove 1, a grille burner (not shown) as heating means provided in the grille storage, an igniter 23 and an ignition detector 24. The front end of the grille 2b is open at the front portion 12 of the gas stove 1 and closed openably and closably by the grille door 28.

  The igniter 23 causes the spark plug provided at the fuel gas discharge port of the stove burner 31 and the grill burner to discharge and ignite by the high pressure pulse generated by the igniter (not shown), and the igniter is the above control unit Controlled by

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

  On both sides of the grille door 28, as shown in FIG. 1, there are provided front panels P1 and P2 which constitute the front portion 12 of the gas stove 1 together with the grille door 28. On the upper side of the left front panel P1, the left side is provided. A point fire button 14a for igniting / extinguishing the stove burner 31 is provided, and a point fire button 14b for igniting / extinguishing the grill burner, and a stove burner 31 on the right side are lit / ignitioned on the upper side of the right front panel P2. A point fire button 14c for extinguishing the fire is provided. The point fire button 14 (14a to 14c) is a heating / stopping manual operation unit for manually performing start / stop of heating in the heating unit 2. Further, on the front face portion 12, thermal power adjustment levers 15 (15a to 15c) serving as heating amount manual operation portions for manually adjusting the heating amounts of the respective heating portions 2 are provided on the respective point extinguishing buttons 14a to 14c. It is

  FIG. 3 is an explanatory view 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.

  The gas valve block 6 is provided with an internal gas flow channel 61, an inlet 61a serving as the upstream end of the gas flow channel 61, and an outlet 61b serving as the downstream end, in the plug body 60. In the gas flow path 61 inside, a valve hole for the safety valve 62 and a valve hole for the main valve 63 are provided from the upstream side. The flow path 61c for the large fire and the flow path 61d for the small fire are provided in parallel on the downstream side of the valve hole for the main valve 63, and the flow path 61c for the large fire is a latch for switching the large thermal power / small thermal power A valve hole for the solenoid valve LB1 is provided, and a valve hole for the latch solenoid valve LB2 is provided in the flow path 61d for a small fire.

  On the downstream side of the valve hole of the latch type solenoid valve LB1 and on the downstream side of the small fire orifice of2 located on the downstream side of the latch type solenoid valve LB2, a flow path 61c for large fire and a flow path 61d for small fire Are joined, and a valve hole for a flow rate control valve 65 interlocked with the thermal power adjustment lever 15 is provided further downstream thereof.

  Incidentally, when the point fire extinguishing button 14 is operated when the cooking container is not detected by the container detecting means 25 described above, the latch type solenoid valve LB1 and the latch type solenoid valve LB2 are closed by the control unit, and heating is performed. The container detection control is performed so as not to start, and the stove burner 31 is configured not to form a flame when the cooking container is not placed on the five-dot 21.

  Further, the gas flow path 61 is provided with a bypass flow path BP for bypassing the portion provided with the latch type solenoid valve LB1 and the latch type solenoid valve LB2, and the bypass flow path BP is provided with a bypass orifice of1. is there. The bypass orifice of1 is provided to share the gas valve block 6 with a plurality of models, and may be opened when the gas valve block 6 is used in application to another model, but in the present embodiment, 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 middle fire and large fire, the thermal power of the stove burner 31 is set according to the combination of opening and closing of the latch type solenoid valve LB1 and the latch type 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 are switched to the open state by the application of pulse current of the polarity for valve opening, and thereafter the valve opening state is maintained even after the energization is stopped, and the polarity for valve closing (open The valve is switched to the closed state by the application of the current of the opposite polarity to that for the valve, and thereafter the closed state is maintained even after the supply of current is stopped. At this time, the pulse width of the valve opening current is set to 200 to 300 ms, and the pulse width of the valve closing current is longer than the pulse width of the valve opening current in order to reliably perform the valve closing. Since it is set from 0.3 seconds to 0.5 seconds and power is saved even when the power of the stove is maintained in various states, it is particularly suitably used when a dry cell is used as a power source of the device.

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

  The downstream side of the valve hole for the flow control valve 65 leads to an outlet for supplying the gas to the stove burner 31.

  A slider 66 is movably attached to the plug body 60 in the front-rear direction, and the slider 66 is pushed rearward by a child lock slide (not shown) whose front end surface is incorporated in the point fire button 14 It is supposed to go backwards.

  The point fire extinguishing button 14 in which the slide for child lock is incorporated is provided so as to be movable back and forth, and a portion above the portion pressed by the finger of the point fire extinguishing button 14 is pivoted on the stove body side The portion pressed by the finger moves back and forth to press the front end surface of the slider 66 rearward. The slider 66 is provided with, for example, a switch mechanism (not shown) for the front position and the rear position consisting of an existing heart-shaped cam etc., and the slider 66 starts from the rear position every time the point fire button 14 is pressed. The front position and the rear position are switched and held so as to be advanced to be positioned at the front position or to be positioned at the rear position by retracting from the front position.

  In addition, a valve rod 67 is provided which advances and retracts as the slider 66 advances and retracts. The tip end side of the valve rod 67 is inserted into the gas flow path 61, and the tip end portion thereof is inserted into the valve hole for the main valve 63 and the valve hole for the safety valve 62 toward the upstream side from the rear side There is. When the slider 66 switches from the front position to the rear position, the valve rod 67 once retracts to the final position behind the rear position and then advances to the rear position. The valve body of the safety valve 62 closing the valve hole from the upstream side is moved to the upstream side, and the valve hole for the safety valve 62 is opened. The safety valve 62 is an electromagnetic valve, and the valve body for the safety valve 62 is closed from the rear by advancing the valve body forward or downstream, and the valve hole for the safety valve 62 due to the valve body retracting backward or upstream. Open

  The safety valve 62 is maintained in the open state by the control unit only when the flame is detected by the ignition detection device 24. When the flame is not detected, the maintenance of the open state by the control unit is stopped and closed. This prevents the fuel gas from flowing out when boil-off or wind-off causes the flame of the ignition detection device 24 to be undetected. 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 judged that an abnormality such as burning or burning has occurred, and the safety valve 62 is closed. . Thus, 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 in the front position, the main valve closes the valve hole for the main valve 63 from the rear, and when the slider 66 is in the rear position, the main valve is for the main valve 63. The valve hole for the main valve 63 is opened behind the valve hole of

  The opening of the valve hole for the flow control valve 65 is freely adjusted by the movement of the needle 65a for adjusting the thermal power in the front-rear direction. The needle 65a is adjusted in the opening degree by operating the thermal power adjustment lever 15, and is adjusted so that the fuel gas supply amount increases as the thermal power adjustment lever 15 goes to the right.

  An instrument plug switch is provided which is switched ON / OFF depending on the position of the point fire button 14 or the slider 66. The device plug switch is turned off when the point fire button 14 (or the slider 66) is located at the front position, and turned on when located at the rear position (including the last position).

  In order to ignite the stove burner 31 and the grill burner, the point fire button 14 is operated to retract the slider 66 from the front position to the rear position. With the valve rod 67 retracted with the slider 66, the safety valve 62 is opened and the main valve 63 is opened, and fuel gas is supplied to the stove burner 31 and the grill burner. In addition, when the slider 66 retracts, the appliance plug switch is turned on, power supply to the control unit is turned on, and the control unit starts operation.

  When the point fire button 14 is pressed and heating is started, a desired heating power can be obtained by operating the heating power adjustment lever 15. When the fire power control lever 15 of the stove unit 2a provided with the stove burner 31 on the left side performs ignition by operating the operation unit of the stove unit 2a, the power is on the middle power side in conjunction with the operation of the operation unit. It is supposed to move and has moderate firepower at the time of ignition.

  When the slider 66 of all the point fire button 14 is in 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 controller Power supply to the power supply ends.

  Next, automatic cooking will be described. Below the left front panel P1 of the gas stove 1, as shown in FIG. 2, a cooking setting unit 7 for the stove is provided. In addition, the cooking setting part for grills is provided in the lower right of the front panel P2 of the right side of the gas stove 1, and the cooking setting part is provided, but it does not describe in detail. Further, on the right of the lower right of the front panel P2 on the right side of the gas stove 1, there is provided a battery case 13 in which a battery serving as a power source of the control unit comprising a microcomputer is accommodated.

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

  The fried food mode is an automatic cooking mode in which the power of the stove burner 31 is automatically adjusted so as to reach the temperature set by the user after ignition of the stove burner 31, and the fried food switch 71a is pressed by 200 times. While the cooking of fried food of the target temperature can be set out of the cooking of a plurality of kinds of fried food such as ° C., 180 ° C., and 160 ° C., the setting is displayed on the fried food display portion 72 a.

  In addition, in the water heating mode and the rice cooking mode, after the ignition of the stove burner 31, it is burned under a preset combustion condition, and in the automatic cooking mode, the stove burner 31 is automatically extinguished when completion of water heating and rice cooking is predicted. is there. The hot water switch 71b can select and set a hot water heater such as whether to extinguish immediately after hot water heating, such as automatic fire extinguishing or 5 minutes of thermal insulation, or how to keep warm for a certain period of time. It is supposed to be In addition, the rice cooker switch 71c can set the cooking of the desired rice cook from among the cooking of a plurality of kinds of rice cookers such as rice and rice porridge by how many times it is pressed, and the above setting is displayed on the rice cooker display unit 72c. ing.

  The latch type solenoid valve LB1 will be described in detail by taking, as an example, a case where the frying mode is executed by selecting the frying mode. The configuration and the like of the latch type solenoid valve LB2 are the same as the latch type solenoid valve LB1, and thus the detailed description of the latch type solenoid valve LB2 is omitted in the present specification.

  When the frying food switch 71a is pressed to select the frying food mode and the stove burner 31 is ignited, the frying thing mode is executed by the control unit, and the control unit sets the temperature of the cooking vessel detected by the temperature sensor 26 In order to maintain the temperature (200 ° C., 180 ° C., or 160 ° C.), the latch solenoid valve LB1 is opened and closed, and the thermal power of the stove burner 31 is switched to the large thermal power and the small thermal power.

  More specifically, when the temperature of the cooking vessel detected by the temperature sensor 26 is higher than the set temperature, the latch solenoid valve LB1 is closed and the small fire orifice of2 shown in FIGS. 3 and 4 is provided. Gas is supplied to the stove burner 31 only from the flow path 61d for small fires, the power of the stove burner 31 becomes small, and the temperature of the cooking vessel detected by the temperature sensor 26 is lower than the set temperature When the latch type solenoid valve LB1 is opened, the flow path 61d for small fire provided with the orifice for2 for bypass small fire shown in FIG. 3 and FIG. 4 and the flow path for large fire provided with the latch type solenoid valve LB1. Gas is supplied to the stove burner 31 from both of the flow paths 61c, and the thermal power of the stove burner 31 becomes a large thermal power.

  Hereinafter, driving of the latch type solenoid valve LB1 and the drive of the latch type solenoid valve LB1 by the control unit (not shown) will be described with reference to FIG.

  FIG. 6 is a schematic cross-sectional view of the latch type solenoid valve LB1. In FIG. 6, the valve closing state is shown on the right side of the center line (dotted line) and the valve opening state is on the left side of the center line (dashed line). Is shown. On the left side of the center line (one-dot chain line) showing the valve open state, the axially extending recess 52 a formed in the plunger 52 and the spring 54 inserted in the recess 52 a are shown. The recess 52 a and the spring 54 in the recess 52 are not shown on the right side of the center line (dashed dotted line) shown.

  The latch type solenoid valve LB1 includes a plunger 52 made of a magnetic body to which the valve body 51 is fixed via a connecting portion 52b, a core 59 made of a magnetic body below the plunger 52, and the valve body 51. The magnet (permanent magnet) 55 for attracting in the valve opening direction (downward in FIG. 6) and the spring (biasing member) for biasing the plunger 52 in the valve closing direction (upward in FIG. 6) And the solenoid (coil) 53 for moving the plunger 52 in the valve opening direction or the valve closing direction by the magnetic force generated by the energization, and storing them. The yoke 56 has an insertion hole through which the upper portion of the plunger 52 is inserted.

  A plunger 52 as a movable magnetic body is accommodated movably in the vertical direction in a cylindrical accommodating portion 83 of the bobbin around which the coil 53 is wound. The core 59 below the plunger 52 is provided with a seal member 58 which is in pressure contact with the inner peripheral surface of the housing portion 83 to prevent gas leakage.

  In this embodiment, when the thermal power of the stove burner 31 is switched from the small thermal power state to the large thermal power state, the supply of primary air to the stove burner 31 follows the rapid increase in the gas supply amount to the stove burner 31. In order to be able to suppress the yellow generation of the flame of the stove burner 31 due to the delay of 1 and the rapid spread of the flame formed in the stove burner 31, it is configured as follows.

  That is, as shown in the horizontal sectional views of FIGS. 6 and 7, the cylindrical plunger 52 accommodated in the cylindrical accommodation portion 83 has an outer peripheral surface near the center in the axial direction (vertical direction in FIG. 6). In addition, mounting grooves 84 extending in the circumferential direction over the required length are formed symmetrically at 180 degree opposite positions along the circumferential direction, and each mounting groove 84 has a radial direction. A rubber member 81 as an elastic member having a circular cross section is fitted in each. The cross-sectional shape of the rubber member 81 is not limited to a circle, and may be an oval or another shape. The rubber member 81 may be fixed to each mounting groove 84 by an adhesive or the like.

  A part of the outer peripheral surface of each rubber member 81 mounted in each mounting groove 84 of the outer peripheral surface of the plunger 52 protrudes outward of each mounting groove 84 and is formed on the inner peripheral surface of the cylindrical housing portion 83 It is in contact.

  That is, except for a part of the circumferential direction where the mounting groove 84 is not formed on the outer peripheral surface of the plunger 52, the rubber member 81 elastically contacting the inner peripheral surface of the accommodation portion 83 is in the circumferential direction. Provided along the

  As described above, the rubber member 81 elastically contacting the inner peripheral surface of the housing portion 83 except for a part in the circumferential direction is attached to the outer peripheral surface of the plunger 52, so that the plunger 52 is accommodated When moving in the vertical direction along the portion 83, frictional resistance is generated due to sliding friction between the rubber member 81 of the outer peripheral surface of the plunger 52 and the inner peripheral surface of the accommodation portion 83, and the moving speed of the plunger 52 is Be suppressed.

  The circumferential length of the rubber member 81, that is, the length along the circumferential direction of the mounting groove 84, the protruding amount of the rubber member 81 protruding outward from the mounting groove 84, the material of the rubber member 81, etc. By appropriately selecting, the degree of suppressing the moving speed of the plunger 52 can be adjusted.

  As described above, the rubber member 81 is provided along the circumferential direction except for a part in the circumferential direction on the outer circumferential surface of the plunger 52, that is, the rubber member 81 is the outer circumferential surface of the plunger 52 The space above and below the rubber member 81 in the accommodating portion 83 when the plunger 52 moves up and down in the cylindrical accommodating portion 83. The movement of gas such as fuel gas is not impeded between the

  In the latch type solenoid valve LB1 of this embodiment, in the valve closed state shown on the right side of FIG. 6, the closed state is maintained by the biasing force of the spring 54. Then, when the valve opening current is supplied to the solenoid (coil) 53 so as to form a magnetic field in the same direction as the direction of the magnetic field formed by the magnet (permanent magnet) 55 from this valve closed state, the formed magnetic field The magnetic force between the plunger 52 and the core 59 increases the suction force, and the plunger 52 is drawn against the biasing force of the spring 54 to move toward the lower core 59 side.

  At this time, since the rubber member 81 mounted on the outer peripheral surface of the plunger 52 is in elastic contact with the inner peripheral surface of the accommodation portion 83, frictional resistance due to sliding friction acts to move the plunger 52 downward. Moving speed is suppressed.

  The plunger 52 moved downward is attracted to the core 59, and the valve body 51 is separated from the valve seat 50 to be in the open state shown on the left side of FIG. Once the plunger 52 is attracted to the core 59, even if the solenoid (coil) 53 is de-energized, the attracted state, that is, the valve open state is achieved by the magnetic force of the magnetic field formed by the magnet (permanent magnet) 55. It will be maintained.

  The solenoid (coil) 53 has a polarity opposite to that of the valve-opening current so as to form a magnetic field reverse to the direction of the magnetic field formed by the magnet (permanent magnet) 55 from this open state. When a current is applied, the magnetic force of the magnetic field formed by the magnet (permanent magnet) 55 is weakened, the attraction between the plunger 52 and the core 59 is reduced, and the biasing force of the spring 54 causes the plunger 52 to Move up away from the core 59.

  At this time, since the rubber member 81 mounted on the outer peripheral surface of the plunger 52 is in elastic contact with the inner peripheral surface of the accommodation portion 83, frictional resistance acts to move the plunger 52 upward. Is suppressed.

  When the plunger 52 moves upward and switches to the closed state, the biasing force of the spring 54 maintains that state even if the energization of the solenoid (coil) 53 is stopped.

  FIG. 8 is a time chart showing the above operation of the latch type solenoid valve LB1, (a) shows the open / close state of the latch type solenoid valve LB1, (b) shows the supply voltage to the solenoid (coil) 53, (c) Shows the position of the plunger 52, (d) shows the degree of valve opening, and (e) shows the flow rate of gas passing through the latch type solenoid valve LB1. In the plunger position of FIG. 6C, "upper" is a position where the latch type solenoid valve LB1 is in a closed state, and "lower" is a position where the latch type solenoid valve LB1 is in an open state.

  From a closed state where the coil supply voltage is 0 V, as shown in FIG. 8B, the coil supply voltage is set to 3 V, and a valve opening current is supplied to the solenoid (coil) 53. As a result, the suction force is increased between the plunger 52 and the core 59, and the plunger 52 is sucked against the biasing force of the spring 54 and moves to the lower core 59 side as described above. Since the rubber member 81 mounted on the outer peripheral surface of the plunger 52 elastically contacts the inner peripheral surface of the accommodation portion 83, frictional resistance acts to suppress the moving speed of the plunger 52 downward The position of the plunger 52 is gradually moved downward as shown in FIG. 8 (c), and the degree of opening of the latch type solenoid valve LB1 is accordingly shown in FIG. 8 (d). The state is gradually opened from the fully closed state to the fully open state, and the gas supply amount to the stove burner 31 gradually increases as shown in FIG. 8 (e). The moving speed of the plunger 52 is increased immediately before the plunger 52 is attracted to the core 59.

  Since the moving speed of the plunger 52 is thus suppressed, the gas to the stove burner 31 is changed when the power of the stove burner 31 is switched from the small heating state to the large heating state using the latch type solenoid valve LB1. It is possible to suppress the rapid increase of the supply amount, suppress the yellowing of the flame of the stove burner 31 caused by the delay in the follow-up of the supply of the primary air, and suppress the rapid spread of the flame.

  That is, the rapid increase of the gas supply amount to the stove burner 31 is suppressed, and the generation of yellow of the flame of the stove burner 31 due to the delay in the follow-up of the supply of primary air to the stove burner 31 is suppressed. The gas stove 1 is configured such that the rapid spread of the flame formed on the stove burner 31 is suppressed when the thermal power is increased to the large thermal power.

  When the coil supply voltage shown in FIG. 8A is 0 V, the solenoid (coil) 53 of the latch type solenoid valve LB1 is not energized, and as shown in FIG. 8D, the latch type solenoid valve LB1 is opened. Maintained.

  As shown in FIG. 8A from the open state of the latch type solenoid valve LB1, when the coil supply voltage is changed from 0 V to -3 V and the valve closing current is supplied, the plunger 52 and the core 59 The suction force is reduced between them, and the biasing force of the spring 54 moves the plunger 52 away from the core 59 and moves upward. As described above, the rubber member 81 attached to the outer peripheral surface of the plunger 52 However, since the elastic contact is made with the inner peripheral surface of the housing portion 83, the frictional resistance acts to suppress the upward moving speed of the plunger 52, and the position of the plunger 52 becomes as shown in FIG. As shown in the figure, the moment it moves away from the core 59, it moves upward gradually, and along with this, the valve opening degree of the latch type solenoid valve LB1 is from full open to full close as shown in FIG. Close gradually and go to stove burner 31 Gas supply amount is gradually decreased as shown in FIG. 8 (e).

  Thereby, even when the power of the stove burner 31 is switched from the large power state to the small power state, the moving speed of the plunger 52 is suppressed, and the rapid decrease of the gas supply amount to the stove burner 31 is suppressed. As a result, the flame blowout of the stove burner 31 caused by the delay in the follow-up of the supply of primary air to the stove burner 31 is suppressed.

  On the other hand, in the conventional latch type solenoid valve in which the plunger is not provided with the rubber member 81, as shown in the time chart of FIG. 9, the valve opening voltage is applied (energization of the valve opening current). As shown in FIG. 9D, the degree of opening rapidly changes in a step-like manner from the fully closed state to the fully open state, and the valve opening degree is changed by application of a valve closing voltage (energization of valve closing current). As shown in FIG. 9 (d), the gas rapidly changes stepwise from fully open to fully closed, and the gas supply to the stove burner sharply increases, or the gas supply to the stove burner Decrease rapidly.

  Since the amount of gas supplied to the stove burner rapidly increases in this manner, yellowing occurs in the flame due to the delay in the follow-up of the supply of primary air to the stove burner, and the flame spreads rapidly. Alternatively, since the amount of gas supplied to the stove burner sharply decreases, flame blowout of the stove burner 31 occurs due to a delay in the supply of primary air to the stove burner 31.

  In the present embodiment, as described above, since the rapid increase of the gas supply amount to the stove burner 31 is suppressed, it is possible to suppress the yellow generation of the flame and to suppress the rapid spread of the flame. Since the rapid decrease of the gas supply amount to the stove burner 31 is suppressed, the flame blowout of the stove burner 31 can be suppressed.

Other Embodiments
(1) In the above embodiment, the mounting grooves 84 are formed at the opposing positions of the outer peripheral surface of the plunger 52 and the rubber members 81 are respectively mounted, but for example, as shown in FIG. A plurality of mounting grooves 84 may be formed at equal intervals, and each rubber member 81 may be mounted in each mounting groove 84, respectively.

  Alternatively, as shown in FIG. 11, a rubber member 81 to which a plurality of spherical rubber portions 81a are connected is attached to an annular mounting groove 84 formed over the entire circumference of the outer peripheral surface of the plunger 52. May be In this case, the circumferential surface of each spherical rubber portion 81 a elastically contacts the inner circumferential surface of the housing portion 83, and the rubber member 81 does not contact the inner circumferential surface of the housing portion 83 in the other portions.

  (2) Although the rubber member is used as the elastic member in the above embodiment, as the elastic member, an elastomer other than rubber may be used.

  (3) In the above embodiment, the gas stove 1 has been described as a built-in gas stove 1 having a grille, but even if the gas stove 1 is a stationary table stove installed by being placed on a stove or the like, Good. Also, the grill may not be provided.

  (4) In the above embodiment, the supply of gas to the stove burner 31 is shut off by closing the latch solenoid valve LB1 and the latch solenoid valve LB2, but the latch solenoid valve LB2 Alternatively, only the magnitude of the gas amount may be switched by opening and closing the latch type solenoid valve LB1.

  (5) In the above embodiment, the valve is opened by applying the valve opening current to the solenoid (coil) 53, and the valve is closed by applying the valve closing current to the solenoid (coil) 53. The valve-opening solenoid (coil) and the valve-closing solenoid (coil) are respectively provided, and the valve-opening solenoid (coil) is energized to open the valve, and the valve-closing solenoid (coil) is energized. It may be configured to close the valve.

DESCRIPTION OF SYMBOLS 1 gas stove 24 ignition detection apparatus 25 container detection means 26 temperature sensor 50 valve seat 51 valve body 52 plunger 53 solenoid (coil)
54 spring 55 permanent magnet 56 yoke 59 core 81 rubber member (elastic member)
83 accommodation portion 84 mounting groove LB1 latch type solenoid valve LB2 latch type solenoid valve

Claims (5)

A heating unit having a stove burner, a gas flow path for supplying gas to the stove burner, a latch type solenoid valve disposed in the gas flow path, and a control unit for controlling energization of the latch type solenoid valve In a gas stove equipped with
The latch type solenoid valve includes: a movable magnetic body to which a valve body for opening and closing the gas flow path is fixed; a cylindrical accommodating portion for movably accommodating the movable magnetic body; and the movable magnetic body Energization is controlled by a permanent magnet that attracts the valve body in the valve opening direction, a biasing member that biases the movable magnetic body in the valve valve closing direction, and the control unit. And a coil configured to move the movable magnetic body in the valve opening direction or the valve closing direction along the cylindrical accommodating portion by a magnetic force generated by energization.
By supplying a valve opening current to the coil in a closed state in which the valve body is closed, the movable magnetic body is moved to shift to an open state in which the valve body is opened, and the valve opening current After the current supply is stopped, the valve opening state is maintained by the suction force by the magnetic force of the permanent magnet exceeding the biasing force by the biasing member, and the valve closing current is supplied to the coil in the valve opening state. The movable magnetic body moves to move to the valve closing state, and after the current supply for the valve closing is stopped, the closing force is caused by the biasing force of the biasing member exceeding the attraction force by the magnetic force of the permanent magnet. Configured to maintain the valve state,
The outer peripheral surface of the movable magnetic body is provided with a rubber member which elastically contacts the inner peripheral surface of the accommodation portion except for a part in the circumferential direction .
The control unit switches the polarity of a coil supply voltage supplied to the coil to positive or negative to control the valve opening current and the valve closing current in the coil.
When the movable magnetic body moves in the housing portion by the energization control, frictional resistance is generated between the rubber member on the outer peripheral surface of the movable magnetic body and the inner peripheral surface of the housing portion to move the movable magnetic body. The moving speed of the magnetic body in the valve opening direction and the valve closing direction is suppressed .
A gas stove characterized by An annular mounting groove is formed over the entire circumference of the outer peripheral surface of the movable magnetic body,
A plurality of spherical rubber portions are connected to the mounting groove, and a rubber member elastically contacting the inner peripheral surface of the housing portion is mounted.
  The gas stove according to claim 1. A plurality of mounting grooves are formed on the outer peripheral surface of the movable magnetic body at equal intervals along the circumferential direction,
A plurality of the rubber members are mounted in a plurality of the mounting grooves;
The gas stove according to claim 1 . A bypass flow passage provided with a gas flow rate limiting unit is connected in parallel to the gas flow passage in which the latch type solenoid valve is disposed, and the control unit controls the opening and closing of the valve body of the latch type solenoid valve Switch the power of the stove burner to a large power and a small power,
The gas stove according to any one of claims 1 to 3. The control unit is provided with a temperature detection unit for detecting the temperature of the cooking vessel heated by the stove burner, and the control unit is based on the detected temperature of the temperature detection unit so as to maintain the temperature of the cooking vessel at a predetermined set temperature. Controlling the opening and closing of the valve body of the latch type solenoid valve to switch the heating power of the stove burner to a large heating power and a small heating power;
The gas stove according to claim 4.

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