JP2563758B2 - Gas cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in gas appliances such as a gas table and a gas oven, and controls gas supply / stop and flow rate of gas to a burner by an electronic control unit including a motor, a microcomputer and a sensor. The present invention relates to a device, and particularly to a gas cooker that ensures safety during a power failure.

[0002]

2. Description of the Related Art In a gas table in a conventional gas appliance of this type, a gas cock is manually rotated to supply and stop gas to the gas burner, and the flow rate is adjusted to control the heat power.

FIG. 7 shows the gas table, which is provided with gas burners 1 and 2 on the left and right sides, and a grill portion 3 used for grilling fish and the like between them. Then, by operating the manual knobs 4, 5, and 6 provided on the front operation unit to open and close the gas cock (not shown), the left gas burner 1, the grill section 3, and the right gas burner 2 are ignited, extinguished, and the gas flow rate is adjusted. Was. In the figure, 7 is a top plate, 8 is Gotoku, 9 is a grill door, and 10
The reference numeral 11 denotes the knob, and the reference numeral 11 denotes the exhaust hole of the grill portion 3.

[0004]

In this conventional gas table, since the knobs 4 to 6 are manually rotated to ignite and extinguish by opening and closing the cock and adjust the gas flow rate by the opening degree of the cock, the operation is very complicated. And, controlling the firepower was difficult. In terms of safety, although there is a raw gas leakage prevention device that uses a safety valve such as a solenoid valve, a tempura fire prevention device, an automatic fire extinguishing device for forgetting to turn off after burning for a long time, an earthquake resistance device Etc. are not provided,
The main reason was that the gas cock was opened and closed manually.

Therefore, it is conceivable to electrically open and close the gas passage and control the gas flow rate so that various safety devices and the like can be easily incorporated and the operation can be easily performed. In this case, ensuring safety in the event of a power outage becomes an issue,
It is an object of the present invention to provide a structure that reliably closes a gas passage in the event of a power failure.

[0006]

In order to achieve the above object, the present invention provides a gas control section for controlling the supply and flow rate of gas to a gas burner, an electronic control section for sending a signal to the gas control section, and An operation unit connected to an electronic control unit and for inputting and outputting a control signal is provided, wherein the gas control unit is a motor, and a gas switch which is driven by the motor to open and close a gas passage,
A gas flow rate control unit for controlling the flow rate of gas, and a position detector for detecting the control positions of the gas switch and the gas flow rate control unit are provided, and the electronic control unit has a backup power source for power failure and power failure determination means. When the power failure determination means determines that there is a power failure, the gas passage is closed by the power of the backup power source.

[0007]

According to the above means, when a control signal for igniting, extinguishing, and adjusting the heat power of the combustion section is input to the electronic control section by operating the keyboard, this signal and the cock from the control position detector of the gas control section are activated. The electronic control unit operates to drive the gas control unit in response to the signal that detects the position of the gas flow rate control unit at that time. That is, the motor rotates to rotate the cock by a predetermined angle to open / close the cock and rotate the gas flow rate control unit to control the gas flow rate. According to the present invention, the electronic control unit is provided with a backup power supply for a power failure and a power failure determining means, so when the power failure determining means determines a power failure, the backup power source operates the gas switch to operate the gas passage. Can be closed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas table adopting an embodiment of the gas supply control device of the present invention will be described below with reference to FIGS. FIG. 6 shows a gas table adopting the gas supply control device of the present invention. Reference numeral 20 denotes an instrument body of a horizontally long gas table, in which a left and a right stove 22, 23 are juxtaposed on a top plate 21. Reference numeral 24 denotes a grill portion such as a baking chamber that is located below the right stove 23 and is provided at the right end of the appliance main body 20. A knob 25 is provided on the front surface of the appliance main body 20 for moving food in and out.
An attached door 26 is provided, and a combustion gas exhaust hole 27 is opened in the top plate 21 at the rear side of the right stove 23. Reference numeral 28 denotes an operation panel provided at the left end of the instrument body 20 via the grill portion 24 and a heat insulating portion 29 having a predetermined width W. The operation panel 28 supplies and stops the gas to the gas burners of the left and right stoves 22, 23 and the grill portion 24,
A plurality of keyboards are provided for inputting control signals to an electronic control unit (details will be described later) 31 including a microcomputer for controlling a gas control unit (details will be described later) 30 that controls the gas flow rate. In this keyboard, the right and left stoves 22, 23 and the grill portion 24 each have a fire extinguishing button 32, a small heat power / ignition button 33, and a large heat power / ignition button 34, for the stove 22 and the right stove 23 in order from top to bottom. For the grill section 24 and the operation panel 28. Reference numerals 35a, 35b and 35c are combustion display lamps of the stove and the grill part, and the number of lights increases or decreases depending on the strength of the heat power. Reference numeral 35 is a cooking timer that doubles as a clock.

Next, the gas control section 30 will be described in detail with reference to FIGS. This gas control unit has the same structure as each stove and grill unit, so an explanation will be given with an example. 37 is a cock body having a gas inlet 38 and a gas outlet 39, and 40 is a closure rotatably provided on the cock body 37, which connects the gas inlet 38 and the gas outlet 39 to each other.
One. 42 is a motor whose rotation speed is lowered by a gear for rotating the closure 40, and which has a fitting hole 40a having a D-shaped cross section.
Is engaged with the closing shaft 40b via the shaft, is slidable in the axial direction, and transmits power only in the rotational direction. 43 is a closed 40
Is a rotatable circular plate gas flow rate control member provided in the cock body 37 between the downstream side of the gas outlet 39 and the gas outlet 39, and the connecting rod 45 is fixed to the D-shaped hole 44 provided in the central portion and the connecting rod 45 is attached. The upper end of 45 is connected to the closure 40 so as to be slidable in the axial direction along the center line of the closure 40 so that the force is transmitted only in the rotational direction. As shown in FIG. 3, the gas flow rate control body 43 is rotated along with a circular arc-shaped gas passage hole 43a along a circumferential line P facing the gas outlet 39 of the cock body 37 so that the gas flow rate is changed from high to low or vice versa. Control holes 43b to 43g having different diameters to be controlled are provided, the control holes 43b to 43g are rotated together with the closing member 40, and the positions of the gas passage hole 43a and the control holes 43b to 43g with respect to the gas outlet 39 are changed by changing the rotation angle to control the gas flow rate. . 46 is a cock body 37
A gas outlet structure closed at the bottom of the gas outlet 47, a gas flow controller 43 pressed against the gas outlet structure 46, and a gas passage hole 43.
a, a spring for preventing gas leakage from a place other than the control holes 43b to 43g, 48 a spring for preventing floating of the closure 40, and 49 a rotation of the gas flow rate control body 43 and the closure 40 rotated by the motor 42. A control position detector that detects an angular position and informs the electronic control unit 31 of the current collector plate 51 having a plurality of current collectors 50, a contact lever 52 with which each current collector 50 of the current collector plate 51 abuts, and a contact B _1. consisting contact plate 53 having up to .about.B _8. Then, the contact plate 53 is fixed to the cock body 37, and the current collector plate 51 is provided with only the force in the rotational direction transmitted to the closing shaft 40b and slidable in the axial direction so that its center line is aligned with the closing shaft 40b. The gas flow hole 4 of the gas flow rate control body 43
Contact points B _{1 to} B ₈ are provided corresponding to 3a and control holes 43b to 43g. The contact plate 53 has a central hole 54 as shown in FIG.
Contact rail 5 on the circumference of A'circumferentially around the center
2, and the contacts B _{1 to} B ₈ are provided on the circumference of B ′, and each current collector 50 rotates on the contact rail and the contact. And
When the current collector 50 is located at the contact B ₁ , the closing member 40 closes to stop gas, and when the current collector 50 is next located at the contact B ₂ , the closing member 40 is rotated by 90 ° and opened to control the gas flow rate. Body 43
It gas passage hole 43a is corresponding to the gas outlet 39 illustrates the fully open state, the Likewise ranking contacts B ₃ .about.B ₈ below corresponding to the control holes 43b~43g gas flow rate control member 43 shown in FIG. 3 Is shown.

Therefore, electronic control is performed via the lead wire 55.
Contact rail 52, contact B on control part 31 ₁~ B₈Is connected
Therefore, the gas control unit 30 (closer 40, gas flow rate control unit)
43) indicates the rotation angle position, for example, contact B
_FourWhile the gas amount shown by is being supplied,
When the high power and ignition button 34 is pressed, a control signal is sent to the electronic control unit.
31 is input to the motor 42 to rotate the motor 42 and contact B₃1 step
Up, up and the amount of gas will increase. 56 is a cock
A motor mounting plate mounted on the main body 37, 57 is a collector plate 51
A spring to prevent floating, 58 is a motor 42
It is a lead wire connected to the electronic control unit 31. 59 is
With the nozzle connected to the gas outlet 39 of the main body 37, the grill
Alternatively, gas is supplied to the stove burner 60. 61 is electric
With the igniter connected to the slave control unit 31, the burner 60
Ignite. 62 is a point when the combustion of the stove burner 60 is detected.
A signal to stop the spark of the firearm 61 is sent to the electronic control unit 31.
It is a sensor for combustion detection.

The above-mentioned gas control unit 30 and electronic control unit 31
Since a household AC power supply is used as a power source for the motor, the motor 42 of the gas control unit 30 and the rotational position detector 49 are used in case of a power failure.
The driving power supply for the above is lost, and the electronic control unit 31 does not work, resulting in an uncontrolled state, which is dangerous. Therefore, the backup power supply 63 and the power failure check circuit 64 shown in FIG. 5 are provided, and the motor 42 is driven by the backup power supply 63 to return the closure 40 from the open state to the closed state. That is, 65 is AC
A DC power supply circuit composed of a rectifier 66, a smoothing resistor 67, and a capacitor 68 is connected to the secondary side by a transformer that lowers 100V. The backup power supply 63 is composed of a capacitor and is connected to the DC power supply circuit via a diode 69 for preventing backflow. Reference numeral 70 is a resistance for preventing overcurrent, which protects the diode 69. 71 and 72 are dividing resistors, which are connected in parallel to the backup power source 63. A comparator 73 has a + terminal connected to the DC power supply circuit, a − terminal connected to a common point of the dividing resistors 71 and 72, and an output terminal connected to the power failure check circuit 64 of the electronic control unit 31. During normal use, the DC power supply circuit supplies power to the motor 42, the electronic control unit 31, and the like.

However, when a power failure occurs, the potential of the + terminal of the comparator 73 becomes 0V, while the-terminal having the potential from the backup power source 63 becomes a high potential, and the output of the comparator 73 is inverted. Then, by transmitting this inverted output, the power failure check circuit 64 of the electronic control unit 31 regards it as a power failure, and the backup power source 63 drives the motor 42 to close the closure 40. A lead wire 74 connects the keyboard of the operation panel 28 to the electronic control unit 31.

In the above embodiment, a control signal is input to the electronic control unit 31 which pushes the ignition button 34 which is the keyboard of the operation panel 28. Then, from the electronic control unit 31,
A signal is sent to the gas control unit 30, the motor 42 rotates, and at the same time, the closure 40 and the gas flow rate control body 43 work together. Then, the closing member 40 is opened, and the gas is matched with the closing member 40 and the gas outlet 39 of the gas flow rate control member 43. The gas passage hole 43a, which is the hole at that time, or any of the control holes 43b to 43g, is passed from the nozzle 59 to the gas burner. 60 (in this case, the stove 22 on the left side), and is ignited and burned by the spark of the igniter 61 which is operated by a signal from the electronic control section 31. Then, when the user wants to adjust the heat power, for example, the one which was pushed first was the heat power large / ignition button 34, so when the heat power small / ignition button 33 is pressed, a control signal is input to the electronic control unit 31, while The rotation angle of the gas flow rate control body 43 up to now is detected by the rotation position detector 49 and notified to the electronic control unit 31, but this position detection is different from the position where the thermal power is reduced to a small degree. A signal is sent from the control unit 31 to the motor 42, and the motor 42 is rotated through the closure 40 to adjust the heat power to a small degree by rotating the gas flow rate control body 43 at a predetermined angle at which the heat power is reduced. Of course, if the gas flow rate control body 43 rotates to a predetermined value, the power supply to the motor 42 stops. Further, at this time, the number of the combustion indicating lamps 35a becomes smaller than the strong thermal power, so that the number of lighting is reduced.

Further, when the fire of the gas burner 60 is extinguished, if the fire extinguishing button 32 is pressed, the electronic control unit 3 is operated in the same manner as described above.
1, the signal is transmitted to the motor 42, and the signals of the positions of the gas flow rate control body 43 and the closure 40 from the rotational position detector 49 are input to the electronic control unit 31, so the electronic control unit 31 rotates the motor 42. Then, the closure 40 is closed.

In the above description of the embodiment, only the ignition and the heat power are adjusted. However, since the gas flow rate is all opened, closed and adjusted electrically as described above, the temperature of the pot bottom placed on the stove is adjusted as necessary. It is also possible to provide a sensor 75 for detecting, confirm the completion of cooking, detect an abnormally high temperature, send a signal for preventing tempura fire to the electronic control unit 31, and rotate the motor 42 to close the closure 40.

As described above, in the embodiment, the opening and closing of the gas cock and the adjustment of the thermal power, which were conventionally performed manually, are automated by the combination of the electronic control unit, the motor, the cock, and the gas flow rate control unit, so that various safety devices can be combined with the temperature sensor. It can be done simply by adding sensors such as.

Further, unlike the general valve system, the gas supply and stop is a cock system so that the safety of gas shutoff is high.

Further, since the motor 42, the closure 40, and the gas flow rate control body are set on the same axis and are connected so as to transmit the force only in the rotational direction, the number of parts is small,
High reliability and low cost.

Furthermore, the gas flow rate control is convenient because the flow rate can be arbitrarily changed by opening a necessary number of control holes in the gas flow rate control body 43.

Furthermore, when the gas control unit 30 is controlled, it is sufficient to rotate the motor 42 only in the following cases. Since there is no use of electric power in other cases, energy saving is achieved as compared with the gas supply control using a solenoid valve. is there.

[0021]

In the gas cooker, a gas control section for controlling the supply and flow rate of gas to the gas burner, an electronic control section for sending a signal to the gas control section, and a control section connected to the electronic control section, and A control unit for inputting and outputting a control signal, the electronic control unit has a backup power supply for a power failure, the gas control unit is driven by the motor and opens and closes a gas passage, A gas flow rate control unit for controlling the flow rate of the gas, a configuration for opening and closing the gas passage, and a position detector for detecting the control position of the gas flow rate control unit, and the electronic circuit determines a power failure by means of power failure determining means. In this case, the gas passage is closed by the electric power of the backup power source, so that it is possible to prevent the combustion from continuing and become uncontrolled during a power failure, and to ensure safety.

[Brief description of drawings]

FIG. 1 is a block diagram of a gas supply control device according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a gas control unit, which is the main part of the same.

FIG. 3 is a plan view of the gas flow rate control body.

FIG. 4 is a front view of the contact plate.

FIG. 5 is a power supply circuit diagram including the backup power supply circuit.

FIG. 6 is a perspective view of a gas table adopting the gas supply control device of the present invention.

FIG. 7 is a perspective view of a gas table adopting a conventional gas supply control device.

[Explanation of symbols]

 30 gas control unit 31 electronic control unit 32 keyboard (operation unit) 40 closure (gas switch) 42 motor 43 gas flow rate control unit 49 control position detector 63 backup power supply 64 power failure check circuit (power failure determination means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kaoru Soga 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-54-138774 (JP, A) JP-A-61- 250418 (JP, A) Actual opening Sho 57-80775 (JP, U) Actual opening Sho 58-162 (JP, U)

Claims (1)

(57) [Claims] 1. In a gas cooker, a gas control unit for controlling the supply and flow rate of gas to a gas burner, an electronic control unit for sending a signal to the gas control unit, and connected to the electronic control unit, and An operation unit for inputting and outputting a control signal is provided, and the gas control unit includes a motor, a gas switch that is driven by the motor to open and close a gas passage, a gas flow rate control unit that controls a gas flow rate, and the gas opening and closing unit. In the case where the electronic control unit has a backup power supply for a power failure and a power failure determination means, and the power failure determination means determines a power failure. Is a gas cooker configured to close the gas passage with the power of the backup power supply.