JP3312354B2 - Gas appliance equipped with a latch type solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas appliance provided with a latch-type solenoid valve and a piezo-electric element for ignition, and igniting with the latch-type solenoid valve opened.

[0002]

2. Description of the Related Art There is known a gas appliance which detects the bottom temperature of a pot during cooking and automatically switches the heating power of a burner so that the oil temperature in the pot becomes constant, for example, in the case of fried food. In the gas appliance, an on-off valve is provided in the gas supply path and a bypass passage of a small flow rate that bypasses the on-off valve is provided, and when the pan bottom temperature is lower than the set temperature, the on-off valve is opened, When the pan bottom temperature exceeds the set temperature, the on-off valve is closed, and gas is supplied through the bypass to weaken the thermal power. When a dry battery is used as the power supply for the gas appliance, a latch-type solenoid valve is used as an open / close valve to reduce power consumption. The open / closed state is maintained by the magnetic force and the urging force of the spring.

On the other hand, when a spark plug is disposed near a burner, for example, when a spark discharge is generated between the burner and the spark plug to ignite gas ejected from the burner, a piezoelectric device is provided by a hammer in conjunction with the ignition operation. Gas appliances that strike an element and generate a high voltage applied to a spark plug are known.

[0004]

When the amount of gas supplied to the burner is small at the time of ignition, it is difficult to perform ignition. Therefore, at the time of ignition, it is necessary to forcibly increase the heating power to a level higher than the medium fire. Therefore, in a gas appliance provided with a latch-type electromagnetic valve in a gas supply pipe to adjust the heating power during cooking, it is desired that the latch-type electromagnetic valve be opened at the time of ignition and ignited in a high heat state. However, in order to switch the open / close state of the latch-type solenoid valve, a short-time energization in the form of a pulse of about 100 ms is sufficient.
Therefore, even if the latch-type solenoid valve is energized immediately after the ignition operation is started and the valve is opened, if the hammer strikes the piezoelectric element after the energization is stopped, the vibration due to the impact is transmitted to the latch-type solenoid valve, The valve holding force due to the magnetic force of the permanent magnet cannot withstand the vibration caused by the impact, and the latch-type solenoid valve closes, causing a problem that a small amount of gas is supplied to the burner and ignition cannot be performed. Further, in a gas appliance in which a main burner is point-fired by a latch-type solenoid valve without providing a bypass passage, when it is desired to ignite the main burner by a spark discharge caused by the hammer, the latch-type is operated by the vibration of the hammer. When the solenoid valve is closed, there is a problem that gas cannot flow to the main burner and ignition cannot be performed.

[0005] In view of the above problems, it is an object of the present invention to provide a gas appliance in which a latch-type solenoid valve does not close even when a hammer strikes a piezoelectric element.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plunger urged in a valve closing direction to act on an electromagnetic force generated by energizing an electromagnetic coil to open the plunger. After stopping the energization of the electromagnetic coil, the plunger is attracted by the permanent magnet to hold the valve open against the urging force, and the permanent magnet is attracted to the plunger by the reverse energization of the electromagnetic coil. After moving the plunger in the valve closing direction and stopping the power supply to the electromagnetic coil in the reverse direction, a latching solenoid valve that holds the plunger closed by the urging force is interposed in the gas supply path to the burner. A gas device having a piezoelectric element that supplies gas to a burner through a gas supply path by opening a latch-type solenoid valve and generates a spark discharge by a hammer strike during an ignition operation. A is, at the time of hitting the hammer for at least the piezoelectric element, characterized by comprising a control device for performing energization control so as to be energized in a direction to move in the valve opening direction of the plunger.

At the time of ignition, the energizing time is adjusted so that the hammer is energized at the time when the hammer strikes the piezoelectric element. The plunger is kept open by cooperation with the generated electromagnetic force. Since vibration does not occur when the impact is completed, the latched solenoid valve keeps the valve opened by the magnetic force of the permanent magnet even when the energization is stopped.

By the way, in order to prevent the latch-type solenoid valve from closing even if the hammer strike timing is slightly shifted, it is necessary to set a relatively long energization time at the time of ignition. On the other hand, after ignition, no vibration occurs due to the impact of the hammer, so that the energization time for opening and closing the latch valve for heat power adjustment may be short.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a burner attached to a gas table which is a gas appliance. Gas is supplied to the burner 1 through a gas supply path 11.
The heating power of the burner 1 is adjusted by rotating the rotary cock 2. As shown in FIG. 2, the rotary cock 2 has a rotation operation shaft 25, and a hammer 22 that strikes the piezoelectric element 23 by the urging force of a piezoelectric element 23 and a spring 24 near the rotation operation shaft 25. And are arranged. Rotating operation shaft 2
5 is provided with an arm 26 that rotates integrally. When the rotating operation shaft 25 is rotated to the left at the time of ignition, the arm 26 moves the hammer 22 against the urging force of the spring 24, and The arm 26 is disengaged from the hammer 22 in a state where the opening of the cock 2 is higher than the medium heat, and the hammer 22 strikes the piezoelectric element 23 by the urging force of the spring 24. The micro switch 21 is mounted near the rotation operation shaft 25, and is turned on when the rotation operation shaft 25 is rotated from the closed state to the valve opening direction. The gas supply path 11 is provided with a latch type solenoid valve 3 and a bypass path 12 for bypassing the latch type solenoid valve 3. An orifice 13 having a set throttle amount is attached to the bypass passage 12.

Referring to FIG. 3, a latch type solenoid valve 3 has a valve body 32 seated on a valve seat 31 so that a gas supply passage 11 is provided.
Close. In the valve closed state, the gas restricted to the orifice 13 is supplied to the burner 1 through the bypass passage 12. On the other hand, as shown in FIG. 3, when the plunger 33 is attracted to the core 35 by the magnetic force of the permanent magnet 34, the valve body 32 is in an open state away from the valve seat 31 and the gas is throttled. Burner 1 through gas supply path 11
Supplied to Note that a coil-shaped spring 36 is disposed between the plunger 33 and the core 35, and the plunger 3
When switching the position 3 from the valve closed state to the valve open state,
By the cooperation of the electromagnetic force generated by energizing the electromagnetic coil 37 and the magnetic force of the permanent magnet 34, the plunger 33 is attracted to the core 35 against the urging force of the spring 36. Once in the valve-open state, the valve-open state is maintained by the magnetic force of the permanent magnet 34 even when the power supply to the electromagnetic coil 37 is stopped. Next, when the electromagnetic coil 37 is energized by reversing the energizing direction, the electromagnetic force generated from the electromagnetic coil 37 causes the permanent magnet 34
And the plunger 33 is moved rightward in FIG. 3 by the urging force of the spring 36. By the way, in order to reverse the direction of energization to the electromagnetic coil 37, for example, a circuit shown in FIG. 5 is used.

An electromagnetic safety valve 4 is interposed further upstream of the gas supply path 11. An ignition plug 13 connected to the piezoelectric element 23 is attached near the burner 1, and when the hammer 22 strikes the piezoelectric element 23, a spark discharge is generated between the ignition plug 13 and the burner 1 to ignite. Is configured. Further, a thermocouple 14 and a thermistor 15 for detecting the temperature of the bottom of the pot P are disposed near the burner 1 at a position where the flame is heated by the flame, and both are connected to the control device 5. In addition, a micro switch 21 and a latch type solenoid valve 3 are connected to the control device 5. The safety valve 4 is opened and held by the thermoelectromotive force of the thermocouple 14, and if a misfire occurs during cooking, the thermoelectromotive force is not output, so that the valve is closed to shut off gas supply to the burner 1. The control device 5 operates using the dry battery 51 as a power supply.

Referring to FIG. 4, when an ignition operation is performed, micro switch 21 is turned on, and thus control device 5 detects that the ignition operation has been performed. Then, a current is supplied to the latch-type solenoid valve 3 in a direction to move the plunger 33 to the open position. If the latch-type solenoid valve 3 is in the open state at the time of the energization, it remains unchanged in the open state. Also, if the valve is in the closed state at the start of energization, the latched solenoid valve 3 switches to the open state almost simultaneously with the start of energization. The energizing time required to switch the latch type solenoid valve 3 to the open state may be about 100 ms, but when energizing at the time of ignition, energizing is continued for about 2 seconds. When the energization is continued for about two seconds in this way, even if the hammer 22 strikes the piezoelectric element 23 and generates vibration, the vibration occurs while the energization is continued, and the plunger 33 causes the permanent magnet 34 to rotate. Since the magnetic force is attracted to the core 35 by the electromagnetic coil 37 in addition to the magnetic force, the valve 35 is kept open without detaching from the core 35 and closing the valve. In this way, the piezoelectric element 23 is struck while the latch-type solenoid valve 3 is held open while the electromagnetic force of the electromagnetic coil 37 is applied, so that the amount of gas supplied at the time of ignition is sufficient to reliably ignite. Can be any amount. By the way, when energizing is continued for 2 seconds, 1
The energization for about 00 ms may be repeated for 2 seconds.

The above operation will be described in detail with reference to FIG. When the microswitch 21 is turned on, the 2s timer provided in the control device 5 is turned on, and the electromagnetic coil 37 is energized in the valve opening direction for 2 seconds. On the other hand, the hammer 22 strikes the piezoelectric element 23 to generate vibration. However, since the power is supplied for 2 seconds, the vibration is generated during the power supply, and the power is maintained even if the vibration stops. After two seconds, the energization is stopped, but the latched solenoid valve 3 is kept open. Further, since the burner 1 is ignited, the pot bottom temperature detected by the thermistor 15 rises. When the pan bottom temperature reaches a predetermined set temperature H, the electromagnetic coil 37 is energized in the valve closing direction. Then, the latch type solenoid valve 3 is immediately switched to the closed state. Since no vibration occurs during the energization, the 100-ms timer provided in the control device 5 is operated to energize for only 100 milliseconds. When the latch type solenoid valve 3 closes, the burner 1
The temperature of the pan bottom drops because the heat of the pan becomes smaller. When the pan bottom temperature falls below the set temperature L, the latch type solenoid valve 3 is opened again, and the heating power is adjusted so that the pan bottom temperature becomes constant.

The present invention may be applied to a system in which the burner 1 is fired by opening and closing the latch-type solenoid valve 3 without providing the bypass passage 12, and the thermal power is adjusted. In this case, in the gas supply path, a fire is ignited by a normal-fire burner branched from the upstream side of the latch-type solenoid valve. In the above-described embodiment, the rotary cock 2 is used. However, a thermal power control valve using a push button and a lever for ignition may be used, and the safety valve is opened and held by thermoelectromotive force. Opening and closing control may be configured.

[0015]

As is apparent from the above description, according to the present invention, when the hammer is struck during the ignition operation, the latch-type solenoid valve is energized in the direction of switching the plunger to the valve opening side. Even if the vibration acts on the latch-type solenoid valve, the latch-type solenoid valve does not close, and ignition can be performed in a state where the thermal power is strong.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement state of a hammer and a piezoelectric element.

FIG. 3 is a sectional view showing the structure of a latch-type solenoid valve.

FIG. 4 is a diagram showing an energization control timing at the time of ignition.

FIG. 5 is a circuit diagram for reversing the direction of current supply to the electromagnetic coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner 2 Rotary cock 3 Latch type solenoid valve 4 Safety valve 5 Control device 22 Hammer 23 Piezoelectric element

Claims (2)

(57) [Claims] 1. A plunger biased in a valve closing direction,
Apply the electromagnetic force generated by energizing the electromagnetic coil,
The plunger is moved in the valve opening direction, and after energization of the electromagnetic coil is stopped, the plunger is attracted by a permanent magnet and held in a valve open state against the urging force. After weakening the attractive force of the permanent magnet and moving the plunger in the valve closing direction to stop the power supply to the electromagnetic coil in the opposite direction, the latching solenoid valve that holds the plunger in the closed state by the biasing force is applied to the gas to the burner. A gas appliance provided with a piezoelectric element interposed in a supply path, supplies gas to a burner through a gas supply path by opening a latch type electromagnetic valve, and generates a spark discharge by a hammer strike during an ignition operation. A control device for controlling the energization so that the plunger is energized in a direction of moving the plunger in the valve opening direction at least when the hammer hits the piezoelectric element. Gas appliance provided with a latching solenoid valve according to claim and. 2. A gas equipped with a latch-type solenoid valve according to claim 1, wherein the energizing time at the time of hitting the hammer is set to be longer than the energizing time for heating power adjustment during cooking. Appliances.