JP5985426B2 - Stove with safety device - Google Patents

Description

  The present invention relates to a stove with a safety device.

Conventionally, a stove using city gas, propane gas, or the like has been widely used in general households and used in cooking and the like.
In the stove, since a flame is emitted directly from the burner, a stove equipped with various safety devices has been devised.
For example, in the conventional technique described in Patent Document 1, human sensors are provided on the left and right sides of the grill exhaust port on the back side of the stove, and when the user's arm or hand approaches or the user wears There is disclosed a stove with a human sensor that reduces or extinguishes the burning power of a burner when an increase in the surface temperature of clothing is detected.
In addition, the prior art described in Patent Document 2 includes a pair of light-shielding photosensors or ultrasonic sensors at the left and right ends in the vicinity of the top plate on the front side of the stove. A gas stove with a flammable safety device that extinguishes a burner when an ultrasonic wave is cut off is disclosed.

JP 2004-293953 A Japanese Patent Laid-Open No. 4-118

In the prior art described in Patent Document 1, only two human sensors for detecting the approach of the human body and temperature rise are arranged on the left and right before the grill exhaust port on the stove rear side. . This makes it difficult to accurately detect the approach of the human body. In particular, the human body approaching the left and right burners on the front side, which is the farthest from the human sensor, will have an obstacle such as a cooking pan between the human sensor and the human body. Is very difficult. Also, since the approach state is not determined by the distance from the center of the burner, the human body is not approaching the human sensor but is approaching the burner, or the human body is approaching the human sensor but the burner May not be able to detect properly when not approaching.
In the prior art described in Patent Document 2, the detection area for detecting the intrusion of a human body or clothing is very narrow. The detection area is only a substantially linear space sandwiched between a pair of sensors provided on the left and right of the front side of the top board, and this cannot detect the intrusion of a human body or clothing from the side of the stove or from above the stove there is a possibility.
The present invention was devised in view of the above points, and can more accurately detect that a human body, clothing, or the like is approaching the burner to be monitored, thereby further improving safety. It is an object to provide a stove with a safety device that can be improved.

In order to solve the above problems, the stove with a safety device according to the present invention takes the following means.
First, the first invention of the present invention includes a single or a plurality of burners, an approach detection means provided in at least one monitor target burner, and a monitoring target based on a detection signal from the approach detection means. A stove with a safety device comprising control means for detecting that an object including a human body or clothing has approached the burner, and alarm means.
And the approach detection means is composed of a plurality of capacitance detection means in which a plurality of electrodes are arranged at predetermined intervals along the direction toward the center of the burner around the burner to be monitored, The control means detects capacitance using each electrode, and detects that an object including a human body or clothing has approached the burner to be monitored based on a change in capacitance corresponding to each electrode. In such a case, an alarm is output using the alarm means.
Each of the plurality of electrodes has an annular shape, and each of the annular electrodes is arranged concentrically around the burner to be monitored.
Alternatively, each of the plurality of electrodes has an arc shape that can surround at least the front side and the left and right sides of the burner to be monitored, and each arc-shaped electrode is a concentric circle centered on the burner to be monitored. Arranged in a shape.

According to the first aspect of the present invention, the plurality of electrostatic capacitance detection means are provided around the burner to be monitored toward the center of the burner.
As a result, it is possible to more accurately detect that a human body, clothing, or the like is approaching the burner to be monitored.

In the first invention, the electrodes of the capacitance detecting means are arranged in a more appropriate circular or arc shape, and the electrodes are further arranged concentrically (the center is the burner to be monitored). ).
As a result, it is possible to detect a human body or clothing approaching the burner with higher accuracy.

Next, a second invention of the present invention is the stove with a safety device according to the first invention , wherein the detected capacitance is a mutual capacitance between two adjacent electrodes, and the mutual capacitance Detection means, transmission means, first switching means capable of connecting the mutual capacitance detection means to any electrode, and second switching capable of connecting the transmission means to any electrode And the control means sequentially selects two adjacent electrodes, and controls the first switching means to connect the mutual capacitance detection means to one of the selected electrodes, and the second switching means. The transmitting means is connected to the other electrode selected by controlling and the mutual capacitance which is the electrostatic capacitance between the two selected electrodes is sequentially detected based on the detection signal from the mutual capacitance detecting means.

In the second invention, the two adjacent electrodes are sequentially selected, the transmitting means is connected to the selected one electrode, the mutual capacitance detecting means is connected to the other electrode, and the capacitance is sequentially detected. Do.
Thereby, since the number of transmission means and the number of mutual capacitance detection means can be reduced, the structure of the stove with a safety device can be simplified, and the cost can also be reduced.

Next, a third invention of the present invention is a stove with a safety device according to the first invention , wherein the detected capacitance is a mutual capacitance between two adjacent electrodes, and a plurality of capacitances are detected. The electrodes are divided into electrode groups composed of two adjacent electrodes. In each of the electrode groups, one electrode is connected to a transmitting means, and the other electrode is connected to a mutual capacitance detecting means. The control means detects a mutual capacitance, which is a capacitance for each of the electrode groups, based on a detection signal from the mutual capacitance detection means connected to each of the electrode groups.

In the third aspect of the invention, the transmitting means is connected to one electrode of an electrode group constituted by two adjacent electrodes, and the mutual capacitance detecting means is connected to the other electrode to detect the capacitance. Therefore, each electrode group is provided with a transmission means and a mutual capacitance detection means.
Thereby, since it is possible to capture the detection signal from the mutual capacitance detection means without switching using the switching means, it is possible to detect the approach of a human body or clothing at a higher speed.

Next, a fourth invention of the present invention is a stove with a safety device according to the first invention, wherein the capacitance to be detected is a self-capacitance for each of the electrodes, A third switching means capable of connecting the self-capacitance detecting means to any one of the electrodes, and the control means controls the third switching means so that the self-capacitance detecting means respectively The self-capacitances corresponding to the respective electrodes are sequentially detected based on the detection signal from the self-capacitance detection means while switching to be sequentially connected to the electrodes.

In the fourth invention, the electrodes are sequentially selected, and the capacitance is detected sequentially by connecting the self-capacitance detecting means to the selected electrodes.
As a result, the number of self-capacitance detection means can be reduced, and since no transmission means is required, the structure of the stove with a safety device can be further simplified, and the cost can be further reduced.

Next, a fifth invention of the present invention is the stove with a safety device according to the first invention, wherein the capacitance to be detected is a self-capacitance with respect to each of the electrodes, The self-capacitance detection means is connected, and the control means detects a self-capacitance that is a capacitance for each of the electrodes based on a detection signal from each of the self-capacitance detection means.

In the fifth invention, the capacitance is detected by connecting the respective self-capacitance detecting means to the respective electrodes. Accordingly, a self-capacitance detecting means is provided for each electrode.
Thereby, since it is possible to capture the detection signal from the self-capacitance detection means without switching using the switching means, it is possible to detect the approach of a human body or clothing at a higher speed.

Next, a sixth invention of the present invention is a stove with a safety device according to any one of the first to fifth inventions , wherein the burner to be monitored is extinguished. It is possible to control the flame of the burner to a small fire as small as the seed fire, and a fire extinguishing means that can be controlled from the control means is provided, and the control means is a monitoring target When it is detected that an object including a human body or clothing approaches the burner at a predetermined speed or more, or approaches a predetermined range, the fire extinguishing means is controlled to control the burner to be monitored. Extinguish fire or use a small fire.

In the sixth aspect of the invention, when the approaching state of the human body or clothing satisfies a predetermined condition, the burner to be monitored is extinguished or set to a small fire.
Thereby, a safer stove with a safety device can be provided.

(A) has shown the perspective view of the front side in one embodiment of the stove with a safety device, (B) has shown the top view in one embodiment of the stove with a safety device. It is a block diagram explaining the structure of the safety device of 1st Embodiment in a stove with a safety device. It is a figure explaining the example of a mode that an electrostatic capacitance is detected. It is a flowchart explaining the example of the process sequence of a control means. It is a figure explaining the structure of the safety device of 2nd Embodiment. It is a figure explaining the structure of the safety device of 3rd Embodiment. It is a figure explaining the structure of the safety device of 4th Embodiment. It is a figure explaining the other example (arc shape) of the shape of an electrode.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.
● [Appearance of stove 1 with safety device and configuration of safety device (Fig. 1)]
First, with reference to the perspective view of FIG. 1A and the plan view of FIG. 1B, the appearance of the stove 1 with a safety device, the configuration and arrangement of the safety device, and the like will be described.
The stove with safety device 1 includes burners 10R, 10L, and 10C on the top plate 13, and includes a grill window 10G and flame adjustment knobs 11R, 11L, 11C, and 11G on the front panel. Further, temperature detection means SR, SL, and SC (temperature sensors) are provided at the centers of the burners 10R, 10L, and 10C, respectively. Each of the temperature detection means SR, SL, and SC is connected to a control unit 40 provided in the stove 1 with a safety device.

Further, on the back side of the top plate around the burner 10R, an approach detection means DR is provided in which a plurality of electrodes are arranged at predetermined intervals along the direction toward the center of the burner 10R. Each electrode of the approach detection means DR is connected to a control unit 40 provided in the stove 1 with a safety device. As a result, a plurality of capacitance detecting means using a plurality of electrodes are configured.
Similarly, an approach detection means DL is provided on the back side of the top plate around the burner 10L, and each electrode of the approach detection means DL is connected to the control unit 40, and the back side of the top plate around the burner 10C. Includes an approach detecting means DC, and each electrode of the approach detecting means DC is connected to the control unit 40.
Note that the top plate portion on which the approach detection means DR, DL, DC are provided on the back side is a conductor such as metal in order to detect the upper capacitance on the front side of the approach detection means DR, DL, DC. Rather than being a dielectric.
In addition, in the stove 1 with a safety device demonstrated in this Embodiment, description of the five virtues of each burner is abbreviate | omitted. In FIGS. 1A and 1B, descriptions of alarm means, fire extinguishing means, and the like are omitted.

● [Configuration of Safety Device of First Embodiment (FIG. 2) and Capacitance Detection (FIG. 3)]
Next, the configuration of the first embodiment of the safety device mounted on the stove 1 with the safety device will be described with reference to FIG.
In the following description, the safety device for the burner 10R shown in FIGS. 1A and 1B will be described. The safety device includes an approach detection means DR, a temperature detection means SR, a control unit 40, alarm means 51 and 52, a fire extinguishing means 53, and the like. Note that the temperature detection means SR and the fire extinguishing means 53 may be omitted.
The approach detection means DR is composed of a plurality of electrodes D1 to D4, and each electrode D1 to D4 has a flat plate shape, and each annular electrode has a burner at a predetermined interval. It is arranged concentrically around the center. Although the number of electrodes is plural, the number is not limited to four.
The control unit 40 includes control means 41 (CPU), transmission means 42 (transmission circuit), mutual capacitance detection means 43 (mutual capacitance detection circuit), first switching means 44 (first switching circuit), and second switching means 45 ( Second switching circuit) and the like.
In the safety device according to the first embodiment, a mutual capacitance between two adjacent electrodes is detected as a capacitance to be detected. Therefore, the transmitter 42 (transmitter circuit) and the mutual capacitance detector 43 (mutual capacitance detector circuit) are provided.

The first switching means 44 has switches R <b> 1 to R <b> 4 that can be set to either short circuit or open, and one terminal of the switches R <b> 1 to R <b> 4 is connected to the mutual capacitance detection means 43. The other terminal of the switch R1 is connected to the electrode D1, the other terminal of the switch R2 is connected to the electrode D2, the other terminal of the switch R3 is connected to the electrode D3, and the other terminal of the switch R4 is connected to the electrode D4. It is connected.
The second switching means 45 has switches T1 to T4 that can be set to either short circuit or open, and one terminal of the switches T1 to T4 is connected to the transmission means 42. The other terminal of the switch T1 is connected to the electrode D1, the other terminal of the switch T2 is connected to the electrode D2, the other terminal of the switch T3 is connected to the electrode D3, and the other terminal of the switch T4 is connected to the electrode D4. It is connected.
The control means 41 can control the 1st switching means 44, can make one of switches R1-R4 into a short circuit state, and can make another switch into an open state.
Moreover, the control means 41 can control the 2nd switching means 45, can make one of switches T1-T4 into a short circuit state, and can make another switch into an open state.

The transmission means 42 generates a pulse for detecting the mutual capacitance, and transmits the pulse from an electrode connected to any one of the switches T1 to T4 that are in a short-circuit state. Then, an electric field is generated from the electrode that transmitted the pulse toward the adjacent electrode. When an object including a human body or clothing approaches, the electric field changes according to the approach distance or the like. Therefore, the mutual capacitance detecting means 43 is connected to the adjacent electrodes by setting one of the switches R1 to R4 corresponding to the adjacent electrodes to a short-circuited state with respect to the electrode to which the transmitting means 42 is connected.
The mutual capacitance detection means 43 detects an electric field with an electrode connected to any one of the switches R1 to R4 that are in a short circuit state.
If the transmitting electrode surrounds the receiving electrode, noise resistance is improved. Therefore, when the switch T2 is short-circuited and the electrode D2 is used as the transmitting side, the switch R1 is short-circuited and the electrode D1 is connected to the receiving side. It is preferable to set to. Similarly, when the switch T3 is short-circuited to make the electrode D3 the transmitting side, the switch R2 is short-circuited to set the electrode D2 to the receiving side, and when the switch T4 is short-circuited to make the electrode D4 the transmitting side, the switch R3 Is preferably short-circuited to set the electrode D3 on the receiving side. When the transmitting electrode surrounds the receiving electrode, the switches T1 and R4 may be omitted.
By switching between the switches T1 to T4 and the switches R1 to R4, for example, every several tens of milliseconds, it is possible to detect the capacitance using each electrode and approach the position of each electrode. It is possible to determine whether or not an object including a human body or clothing is approaching.

The temperature detection means SR detects the temperature of the burner and outputs a detection signal to the control means 41.
The alarm means 51 is a speaker, for example, and outputs an alarm by voice.
The alarm means 52 is, for example, an LED, and outputs an alarm with light.
The fire extinguishing means 53 is, for example, an electromagnetic valve capable of stopping supply of fuel to the burner and restricting the supply of fuel. The supply of fuel to the burner is stopped to extinguish the burner, or fuel to the burner. It is possible to control the flame of the burner to a small fire that is as small as the seed fire.
The control means 41 is a microcomputer (CPU), controls the first switching means 44, the second switching means 45, and the transmission means 42, detects the burner temperature based on the detection signal from the temperature detection means SR, Based on the detection signal from the mutual capacitance detection means 43, the electrostatic capacitance (mutual capacitance) using each electrode is detected. If it is determined that the human body is approaching, the alarm means 51 and 52 are controlled to output an alarm, and if it is determined that the burner should be extinguished, the fire extinguishing means 53 is controlled to extinguish the burner, or Make a small fire.

FIG. 3 shows an example of an electric field generated between adjacent electrodes.
For example, the switch T2 in FIG. 2 is short-circuited and the transmitting means 42 is connected to the electrode D2 (with the electrode D2 as the transmitting side), the switch R1 is short-circuited and the mutual capacitance detecting means 43 is connected to the electrode D1 (the electrode D1 is connected). 3), the electric field E1 in FIG. 3 is generated. When a human body or the like approaches this electric field E1 or blocks the electric field E1, an electric field different from a state where the human body or the like is not approaching can be detected. The capacitance is detected by detecting the electric field with respect to the transmitted pulse.
The control means 41 detects the electrostatic capacitance by “generating the electric field E1 with the electrode D2 as the transmitting side and the electrode D1 as the receiving side”, and then detects “the electric field E2 with the electrode D3 as the transmitting side and the electrode D2 as the receiving side. ”Is generated” and the capacitance is detected, and then the operation of “generating the electric field E3 with the electrode D4 as the transmission side and the electrode D3 as the reception side” to detect the capacitance is repeated. Detect approach.
The transmission means, the mutual capacitance detection means, the first switching means, and the second switching means may be provided in each of the approach detection means DR, DL, and DC, or one set of transmission means, mutual capacitance detection means, and first The first switching unit and the second switching unit may be used for all approach detection units DR, DL, and DC.

[Processing procedure in the control means 41 (FIG. 4)]
Next, an example of a processing procedure in the control means 41 of the control unit 40 will be described using the flowchart shown in FIG.
The control means 41 performs the approach detection process shown in FIG. 4A at a predetermined timing (for example, every predetermined time such as every several tens [ms]).
In step S10, the control means 41 executes an approach detection subroutine (burner 10R) and executes an approach detection process for the burner 10R. In step S20, the control means 41 executes an approach detection subroutine (burner 10L), An approach detection process for the burner 10L is executed, and in step S30, the control means 41 executes an approach detection subroutine (burner 10C) to execute an approach detection process for the burner 10C. The approach detection subroutine will be described later.

In step S40, the control means 41 determines whether or not it is determined that a human body or the like is approaching in any one of the burners 10R, 10L, and 10C as a result of executing steps S10, S20, and S30. If it is determined that a human body or the like is approaching any one of the burners (Yes), the process proceeds to step S50, and if no human body or the like is detected by any burner (No), the process proceeds to step S60C. .
When it progresses to step S50, the control means 41 determines whether the approach level is large in the burner in which approach was detected. For example, when approach is detected by the burner 10R, the detection result of the electrostatic capacity of the burner 10R is read, and based on the detected electrostatic capacity, a human body or the like is located at a predetermined distance to the burner 10R (within a predetermined range). It is determined that the approach level is high, for example, when it is determined that the vehicle is approaching to the burner 10R at a predetermined speed or more. When it is determined that the approach level is high (Yes), the process proceeds to step S60A, and when it is not determined that the approach level is high (No), the process proceeds to step S60B.

When the process proceeds to step S60A, the control means 41 controls the fire extinguishing means 53 to extinguish all the burners, and proceeds to step S70A.
Instead of extinguishing all burners, fire extinguishing means may be provided in each burner so that only the burners determined to have a high approach level may be extinguished. Further, the fire may be controlled to be “small fire” that reduces the flame to the level of the seed fire (the level of the flame hidden in the bottom of the cooking pan or the like) without extinguishing the fire. And also when controlling to a small fire, you may make it control all the burners to a small fire, and you may make it control only the burner determined that the approach level is large to a small fire.

When the process proceeds to step S60B, the control means 41 controls the fire extinguishing means 53 to cancel the fire extinguishing, and proceeds to step S70A.
When the process proceeds to step S60C, the control means 41 controls the fire extinguishing means 53 to cancel the fire extinguishing, and proceeds to step S70C.
When canceling fire extinguishment, for example, if it is currently extinguished, reignition is performed, and if it is currently controlled to a small fire, it is restored to the original flame size, and reignition or restoration has already been performed. If so, there is no need to do anything and maintain the current state.
When the process proceeds to step S70A, the control unit 41 controls the alarm units 51 and 52 to output an alarm and ends the process.
When the process proceeds to step S70C, the control unit 41 controls the alarm units 51 and 52 to cancel the alarm output, and ends the process.

  Next, the processing procedure of the approach detection subroutine of FIG. When executed from step S10, the burner 10R is executed as a parameter. When executed from step S20, the burner 10L is executed as a parameter. When executed from step S30, the burner 10C is executed as a parameter. The Hereinafter, a case where the process is executed from step S10 and the burner 10R is used as a parameter will be described.

In step S110, the control means 41 detects the temperature of the burner 10R based on the detection signal from the temperature detection means SR corresponding to the burner 10R, and proceeds to step S120.
In step S120, the control means 41 determines whether or not the burner 10R is burning based on the detected temperature. If it is determined that combustion is in progress (Yes), the process proceeds to step S130. If it is determined that combustion is not being performed (No), the process proceeds to step S160B.
When it progresses to step S130, the control means 41 detects an electrostatic capacitance. In this case, as described above, after the capacitance is detected by “generating the electric field E1 with the electrode D2 as the transmission side and the electrode D1 as the reception side”, the “electrode D3 as the transmission side and the electrode D2 as the reception side” are detected. Generate electric field E2 and detect the capacitance, and then generate electric field E3 with electrode D4 as the transmitting side and electrode D3 as the receiving side to determine each capacitance (in this case, each mutual capacitance). Detect and proceed to step S150.
In this way, by sequentially moving the electrodes for detecting the capacitance by high-speed switching, all the electrodes are scanned at a predetermined cycle (in this case, the execution cycle of the processing in FIG. 4A), and due to the approach of a human body or the like The change in capacitance is grasped as time-series data synchronized with a predetermined period, and the approach of a human body or the like is detected in real time.

When it progresses to step S150, the control means 41 determines whether a human body etc. are approaching the target burner 10R. For example, it is possible to determine whether or not a human body or the like is approaching the burner 10R by comparing each capacitance obtained during the previous processing with each capacitance obtained this time. In addition, since it is possible to know which electrode a human body is approaching, the control means can be used when the distance to the burner is less than a predetermined distance, when the distance to the burner is predicted to be less than the predetermined distance, If it is determined that the state should be warned based on the direction and the speed of approach, it is determined that the human body is approaching.
When it is determined that a human body or the like is approaching the burner 10R (Yes), the process proceeds to step S160A, and when it is determined that a human body or the like is not approaching the burner 10R (No), the process proceeds to step S160B.
When the process proceeds to step S160A, the control means 41 determines (stores) that a human body or the like is approaching the burner 10R, and returns (returns) from the subroutine.
When the process proceeds to step S160B, the control means 41 determines (stores) that there is no human body approaching the burner 10R, and returns (returns) from the subroutine.

● [Configuration of the safety device of the second embodiment (FIG. 5)]
Next, the configuration of the second embodiment of the safety device will be described with reference to FIG.
In the second embodiment, as in the first embodiment, the mutual capacitance between adjacent electrodes is detected as a capacitance, except that the transmission means and the mutual capacitance detection means are not switched.
Hereinafter, differences from the first embodiment will be mainly described.

The control unit 40B of the safety device of the second embodiment shown in FIG. 5 is different from the control unit 40 of the safety device of the first embodiment shown in FIG. 45 is omitted, and transmission means 42A and 42B and mutual capacitance detection means 43A and 43B are provided instead of the transmission means 42 and the mutual capacitance detection means 43. The electrode D2 is connected to the transmitter 42A and set exclusively for the transmitter, and the adjacent electrode D1 (in the direction surrounded by the electrode D2) is connected to the mutual capacitance detector 43A and set exclusively for the receiver. . The electrode D4 is set exclusively for the transmitting side with the transmitting means 42B connected thereto, and the adjacent electrode D3 (in the direction surrounded by the electrode D4) is set exclusively for the receiving side with the mutual capacitance detecting means 43B connected thereto.
Then, the control means 41A controls the transmission means 42A and 42B and takes in the detection signals from the mutual capacitance detection means 43A and 43B.
Thus, in 2nd Embodiment, the electrode group is comprised by two adjacent electrodes (In this case, the electrode group of the electrode D2 and the electrode D1 and the electrode group of the electrode D4 and the electrode D3 are comprised).
The transmitting means is connected to one electrode of each electrode group, and the mutual capacitance detecting means is connected to the other electrode.

As for the processing procedure, in step S130 of the flowchart shown in FIG. 4B, the control unit 41A controls the transmission unit 42A to transmit from the electrode D2, and from the mutual capacitance detection unit 43A via the electrode D1. Based on the detection signal, the mutual capacitance between the electrode D2 and the electrode D1 is detected. The control unit 41A controls the transmission unit 42B to transmit from the electrode D4, and detects the mutual capacitance between the electrode D4 and the electrode D3 based on the detection signal from the mutual capacitance detection unit 43B via the electrode D3. .
In the second embodiment, since it is not necessary to switch the transmission means and the mutual capacitance detection means by the first switching means and the second switching means, the mutual capacitance can be increased in a relatively short time compared to the first embodiment. Can be detected.
Other processing procedures are the same as those in the first embodiment, and a description thereof will be omitted.

● [Configuration of the safety device of the third embodiment (FIG. 6)]
Next, the configuration of the third embodiment of the safety device will be described with reference to FIG.
In the first embodiment, since the mutual capacitance is detected as the electrostatic capacitance, the transmission means is connected to the transmission-side electrode, and the mutual capacitance detection means is connected to the reception-side electrode. However, in the third embodiment, since the self-capacitance for each electrode is detected as the capacitance, no transmission means is required, and the self-capacitance detection means 43C is sequentially applied to each electrode using the switching means. The point of connecting is different.
Hereinafter, differences from the first embodiment will be mainly described.

The control unit 40C of the safety device of the third embodiment shown in FIG. 6 is different from the control unit 40 of the safety device of the first embodiment shown in FIG. A third switching means 46 (third switching circuit) and a self-capacitance detecting means 43C (self-capacitance detecting circuit) are provided instead of the first switching means 44 and the mutual capacitance detecting means 43.
The control means 41C controls the third switching means 46, sets the switch R1 in a short-circuited state, detects the self-capacitance using the electrode D1 and the self-capacitance detecting means 43C, and then sets the switch R2 in a short-circuited state to self-establish itself After detecting the self-capacitance using the capacitance detection means 43C, the switch R3 is short-circuited to detect the self-capacitance using the electrode D3 and the self-capacitance detection means 43C, and then the switch R4 is short-circuited to the electrode D4 and the self-capacitance. The self-capacitance is detected using the capacity detection means 43C.
As described above, in the third embodiment, the self-capacitance detecting means is sequentially connected to each electrode to detect the self-capacitance.

Regarding the processing procedure, in step S130 of the flowchart shown in FIG. 4B, the control unit 41C controls the third switching unit 46 to connect the self-capacitance detection unit 43C sequentially from the electrode D1 to the electrode D4. The self-capacitance using the electrode D1, the self-capacitance using the electrode D2, the self-capacitance using the electrode D3, and the self-capacitance using the electrode D4 are detected.
In the third embodiment, since the second switching unit and the transmission unit are omitted from the first embodiment, the configuration of the control unit 40C can be further simplified.
Other processing procedures are the same as those in the first embodiment, and a description thereof will be omitted.
The self-capacitance detection means and the third switching means may be provided for each of the proximity detection means DR, DL, and DC, or one set of self-capacitance detection means and the third switching means may be provided for all the proximity detection means DR. , DL and DC may be used.

● [Configuration of the safety device of the fourth embodiment (FIG. 7)]
Next, the configuration of the fourth embodiment of the safety device will be described with reference to FIG.
The fourth embodiment is the same as the third embodiment in that the self-capacitance for each electrode is detected as the capacitance, but each self-capacitance detecting means is applied to each electrode without using a switching means. Is different in that is connected.
Hereinafter, differences from the third embodiment will be mainly described.

In the safety device control unit 40D of the fourth embodiment shown in FIG. 7, the third switching means 46 is omitted from the safety device control unit 40C of the third embodiment shown in FIG. Self capacity detecting means 43D to 43G are provided instead of the capacity detecting means 43C. Accordingly, each of the self-capacitance detecting means 43D to 43G is connected to each of the electrodes D1 to D4.
Then, the control means 41D detects the self-capacitance using the electrode D1 and the self-capacitance detection means 43D without controlling the switching means, detects the self-capacitance using the electrode D2 and the self-capacitance detection means 43E, and the electrode D3 The self-capacitance can be detected using the self-capacitance detecting means 43F, and the self-capacitance can be detected using the electrode D4 and the self-capacitance detecting means 43G.

As for the processing procedure, in step S130 of the flowchart shown in FIG. 4B, the control means 41D controls the self-capacitance using the electrode D1, the self-capacitance using the electrode D2, and the electrode without controlling the switching means. The self-capacitance using D3 and the self-capacitance using the electrode D4 are detected.
In the fourth embodiment, since it is not necessary to switch the self-capacitance detecting unit as compared with the third embodiment, the self-capacitance can be detected in a relatively short time.
Other processing procedures are the same as those in the third embodiment, and a description thereof will be omitted.

● [Other examples of electrode shape (Fig. 8)]
In the above description, an example has been described in which the shape of the electrode of the approach detection unit is an annular shape. However, as shown in FIG. 8, the shape of each electrode of the approach detection unit DR ′, DL ′, DC ′ is an arc shape. The arc-shaped electrodes may be arranged concentrically around the burner. It may be arcuate, but if it is at least arcuate around the front side and the left and right sides of the burner to be monitored, a sufficient range is detected to detect the approach of the user's body from the front. can do.

As described above, the stove with a safety device described in the present embodiment has the electrodes, which are capacitance detection means, arranged concentrically around the burner to be monitored, so that the cooking pan or the like is an obstacle. In addition, it is possible to more accurately detect that a human body or clothing is approaching, and safety can be further improved.
Further, by detecting mutual capacitance or self-capacitance as the detected capacitance, it is possible to appropriately detect the approach of a human body or the like.

The stove with a safety device of the present invention is not limited to the appearance, configuration, structure, processing, and the like described in the present embodiment, and various modifications, additions, and deletions are possible without departing from the scope of the present invention.
In the description of the present embodiment, the stove with a safety device provided with the temperature detecting means and the fire extinguishing means has been described, but the temperature detecting means and the fire extinguishing means may be omitted.
In the description of the present embodiment, as an example of the alarm unit, an example of the alarm unit that outputs an alarm by sound and the alarm unit that outputs an alarm by light has been described. However, only one of them may be provided. Alternatively, alarm means for outputting other types of alarms such as vibration means may be provided. The types of alarm means and the number of alarm means are not limited to those described in the present embodiment.
In the description of the present embodiment, a stove with a safety device including three burners has been described as an example, but the number of burners provided is not particularly limited. In the description of the present embodiment, an example in which all the burners provided are provided with the approach detection means DR, DL, DC has been described, but it is only necessary that at least one burner is provided with the approach detection means.

1 Stove with safety device 10R, 10L, 10C Burner 13 Top plate 40 Control unit 41, 41A, 41C, 41D Control means 42, 42A, 42B Transmission means 43, 43A, 43B Mutual capacitance detection means 43C, 43D-43G Self capacity detection Means 44 First switching means 45 Second switching means 46 Third switching means 51, 52 Alarm means 53 Fire extinguishing means D1-D4 Electrodes DR, DL, DC, DR ′, DL ′, DC ′ Approach detecting means SR, SL, SC Temperature detection means

Claims (6)

One or more burners,
Access detection means provided in at least one of the burners to be monitored;
Control means for detecting that an object including a human body or clothing has approached the burner to be monitored, based on a detection signal from the approach detection means;
In a stove with a safety device equipped with an alarm means,
The approach detection means is composed of a plurality of capacitance detection means in which a plurality of electrodes are arranged at predetermined intervals along a direction toward the center of the burner around the burner to be monitored.
The control means detects capacitance using each electrode, and detects that an object including a human body or clothing has approached the burner to be monitored based on a change in capacitance corresponding to each electrode. If so, output an alarm using the alarm means ,
Each of the plurality of electrodes has an annular shape, and each annular electrode is disposed concentrically around the burner to be monitored.
Or
Each of the plurality of electrodes has an arc shape that can surround at least the front side and the left and right sides of the burner to be monitored, and each arc-shaped electrode is concentrically centered on the burner to be monitored Arranged,
Stove with safety device. A stove with a safety device according to claim 1 ,
The capacitance to be detected is the mutual capacitance between the two adjacent electrodes,
Mutual capacitance detecting means, transmitting means, first switching means capable of connecting the mutual capacitance detecting means to any electrode, and first capable of connecting the transmitting means to any electrode 2 switching means,
The control means includes
Two adjacent electrodes are sequentially selected, and the mutual capacitance detecting means is connected to one of the electrodes selected by controlling the first switching means, and the other electrode selected by controlling the second switching means. A transmitting means is connected, and based on a detection signal from the mutual capacitance detecting means, a mutual capacitance that is a capacitance between the selected two electrodes is sequentially detected.
Stove with safety device. A stove with a safety device according to claim 1 ,
The capacitance to be detected is the mutual capacitance between the two adjacent electrodes,
The plurality of electrodes are divided into electrode groups composed of two adjacent electrodes,
In each of the electrode groups, transmitting means is connected to one electrode, and mutual capacitance detecting means is connected to the other electrode,
The control means includes
Based on a detection signal from the mutual capacitance detection means connected to each of the electrode groups, a mutual capacitance that is a capacitance for each of the electrode groups is detected.
Stove with safety device. A stove with a safety device according to claim 1 ,
The capacitance to be detected is the self-capacitance for each of the electrodes,
A self-capacitance detecting means; and a third switching means capable of connecting the self-capacitance detecting means to any one of the electrodes,
The control means includes
The third switching means is controlled to switch the self-capacitance detection means so that the self-capacitance detection means are sequentially connected to the respective electrodes, and based on the detection signal from the self-capacitance detection means, Detects self-capacitance that is electric capacity sequentially
Stove with safety device. A stove with a safety device according to claim 1 ,
The capacitance to be detected is the self-capacitance for each of the electrodes,
Self-capacitance detection means is connected to each of the electrodes,
The control means includes
Based on detection signals from the respective self-capacitance detection means, a self-capacitance that is a capacitance with respect to each of the electrodes is detected.
Stove with safety device. A stove with a safety device according to any one of claims 1 to 5 ,
The burner to be monitored is provided with a fire extinguishing means capable of extinguishing the burner or controlling the flame of the burner to a small fire as small as a seed fire and controllable from the control means. And
When the control means detects that an object including a human body or clothing is approaching the burner to be monitored at a predetermined speed or more, or close to a predetermined range, the fire extinguishing means is Control to extinguish or burn the burner to be monitored,
Stove with safety device.

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