JP2015014415A - Stove burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problem: a conventional stove burner is not absolutely used after occurrence of valve opening failure in a main valve while having no safety hazard because lighting after the valve opening failure is prohibited, so that a user cannot even boil water until the valve opening failure is resolved if a lighting-prohibited condition is established, for example, during cooking or before cooking.SOLUTION: A main valve comprises a motor safety valve provided with a movable electromagnet moved back and forth by a motor, a valve body held in a valve-open state while fastly stuck to the movable electromagnet, and a spring making the valve body drive in a valve-closing direction when the fastly sticking force due to the movable electromagnet is vanished. Lighting after the failure is not prohibited and the stove burner is allowed to be continuously used when the gas burner is not extinguished by driving with the spring and also when the gas burner is extinguished by moving the movable electromagnet to the side of the valve body by the motor and pushing the valve body in a valve-closing direction with the movable electromagnet.

Description

  The present invention relates to a gas stove provided with a plurality of gas burners.

  In this conventional gas stove, a branch pipe for supplying gas to each of a plurality of gas burners is provided in parallel, and this branch pipe is branched from one main pipe. The main pipe is provided with a main valve. Each branch pipe is provided with an electromagnetic safety valve for closing the branch pipe and shutting off the supply of gas to the corresponding gas burner, in addition to a thermal power control unit for adjusting the thermal power by increasing or decreasing the flow rate.

  This electromagnetic safety valve includes an electromagnet and a valve body biased by a spring in the valve closing direction. When the valve is opened, the valve body is moved to the electromagnet side by an external force, and the valve body is attracted and held by the electromagnet. When closing the valve, the energization to the electromagnet is stopped and the attractive force is extinguished, so that the valve element is driven by the biasing force of the spring to close the valve.

  When the gas burners are individually extinguished when a plurality of gas burners are in the combustion state, the electromagnetic safety valve of the branch pipe that supplies the gas to the gas burner to be extinguished is closed. However, in order to check whether the main valve has a valve opening failure, that is, a failure that does not completely close even if a valve closing command is issued to the main valve, When extinguishing a gas burner, rather than closing the corresponding electromagnetic safety valve, issue a valve closing command to the main valve, and if the gas burner extinguishes by the valve closing command, there is no valve opening failure in the main valve. What is determined is known (for example, see Patent Document 1).

  In this case, if it is determined that a valve opening failure has occurred in the main valve, that is, if the gas burner does not extinguish even if a valve closing command is issued to the main valve when extinguishing the gas burner that is burning alone After the electromagnetic safety valve corresponding to the gas burner is closed, the subsequent ignition operation is completely prohibited so that the gas stove cannot be used.

JP 2010-14336 A (paragraph [0020])

  In the above conventional gas stove, there is no problem in safety because the ignition after that is prohibited in the case of a valve opening failure in the main valve, but since the gas stove cannot be used at all thereafter, for example during cooking or before cooking If the ignition is prohibited, there is a problem in that it cannot even be heated until the valve opening failure is solved after inspection and repair.

  However, if ignition is allowed to continue even after a valve opening failure has occurred, the only means for shutting off the gas supply to the gas burner is the electromagnetic safety valve. I can't.

  Then, this invention makes it a subject to provide the gas stove which can continue use, ensuring safety | security even if valve opening failure arises in a main valve in view of said problem.

  In order to solve the above-described problems, the gas stove according to the present invention is provided with one main valve in the gas supply pipe, and the downstream of the main valve is branched into parallel branch pipes that supply gas to each of the plurality of gas burners. When each gas burner is individually extinguished, an electromagnetic safety valve is closed in each branch pipe, but when a gas burner that is burning alone is extinguished, the electromagnetic safety valve remains open. A valve closing command is issued to the main valve, and when the gas burner cannot be extinguished by the valve closing command, the electromagnetic safety valve is closed and the ignition is prohibited thereafter. A motor safety valve including a valve body that is held open by being attracted to the movable electromagnet, and a spring that drives the valve body in a valve closing direction when the attraction force by the movable electromagnet disappears; When extinguishing a gas burner that is burning by itself, the adsorption force of the movable electromagnet is extinguished and the valve body is driven in the valve closing direction by the spring, and the gas burner is not extinguished by the spring drive, and the movable electromagnet by the motor When the gas burner is extinguished by moving the valve to the valve body side and pushing the valve body in the valve closing direction with the movable electromagnet, the subsequent ignition is not prohibited and the use is continuously permitted.

  When a valve opening failure occurs in the main valve, dust or the like is caught between the valve body and the valve seat, and the valve body does not adhere to the valve seat and a gap is formed, or the valve body is held by suction Even if the energization of the electromagnet is stopped and the attraction force is extinguished, the valve body may not be separated from the electromagnet. In such a case, the gas may be shut off by moving the movable electromagnet and pressing the valve element against the valve seat. In addition, it is conceivable that the problem that dust is stuck or the valve body does not move away from the electromagnet is eliminated at this time. Therefore, if the gas can be shut off by pushing the valve body with a movable electromagnet, the gas can be shut off by pushing the valve body again with the movable electromagnet even if the cause of the valve opening failure has not been resolved. Continued to use without. In addition, if the cause of the valve opening failure is eliminated, it can be used normally thereafter.

  In addition, when the gas burner is not extinguished by driving the valve body by the spring, an error notification is given, and subsequent use is permitted, and when the gas burner is extinguished by the spring during the next fire extinguishing operation, an error notification is given. If canceled, it is possible to eliminate the state in which the error notification continues to be performed in a state where the normal state is restored.

  However, even if the movable electromagnet is pressed against the valve body to shut off the gas, it is not desirable to continue to use the valve in a state where the valve opening failure is still not solved. Therefore, when the state in which the gas burner does not extinguish continuously by driving the valve body by the spring occurs for a predetermined number of times, it is desirable to prohibit subsequent ignition.

  It should be noted that it is desirable to know the history when performing inspection and repair in a state where the valve opening failure has been eliminated. Therefore, it is desirable to record in the memory the history that the gas burner did not extinguish due to the driving of the valve element by the spring.

  As is apparent from the above description, the present invention can continue to be used without prohibiting subsequent ignition even if a valve opening failure occurs in the main valve.

External view of gas stove according to the present invention Block diagram showing the configuration of the gas stove Sectional view showing the structure of the main valve Flow chart showing control of gas stove

  Referring to FIG. 1, reference numeral 1 denotes a gas stove according to the present invention, and a top plate on the upper surface is provided with three gas burners, that is, a large burner 11, a middle burner 12, and a small burner 13. And on the front side, there are provided fire extinguishing buttons 2 on the left and right with the central grille in between. This point fire extinguishing button 2 is buried in the front surface of the gas stove 1 when the gas burner is extinguished, and when it is pushed in a little when igniting, the lock is released and protrudes forward. Due to the protrusion, an ignition switch (not shown) is turned ON and the gas burner is ignited. When the point-extinguishing button 2 is rotated to the left and right, the heating power increases and decreases. Reference numeral 10 denotes a power switch.

  Referring to FIG. 2, reference numeral 14 denotes a grill burner provided in the grill portion. The branch pipes 11a, 12a, 13a, 14a for supplying gas to the burners 11, 12, 13, 14 are provided in parallel. These four branch pipes 11a, 12a, 13a, 14a are all motor safety valves. (Original valve) 4 is connected. Further, the branch pipe 11 a that supplies gas to the large burner 11 will be described as an example. The branch pipe 5 is provided with a thermal power control device 5. In this thermal power control device 5, a thermal power control unit 51 that increases or decreases the amount of gas supplied to the large burner 11 through the branch pipe 11 a and an electromagnetic safety valve 52 in conjunction with the rotation of the point fire extinguishing button 2. Is provided.

  The electromagnetic safety valve 52 is provided with an electromagnet, a valve body that is attracted and held by the electromagnet, and a spring that biases the valve body in the valve closing direction. When the above-mentioned point-extinguishing button 2 is pushed once from the buried state and an ignition operation is performed, a rod (not shown) is driven by a motor, and the rod pushes the valve body against the biasing force of the spring toward the electromagnet, and the valve body is electromagnetized. Press on. In this state, the large burner 11 is ignited by the spark emitted by the spark plug 11b, and when the controller 3 detects the ignition by the thermoelectromotive force from the thermocouple 31, the electromagnet of the electromagnetic safety valve 52 is energized from the controller 3 and the valve body is opened. Hold by adsorption.

  When the fire extinguishing operation is performed by pressing the point fire extinguishing button 2, the controller 3 stops energization of the electromagnet of the electromagnetic safety valve 52. Then, since the adsorption force of the electromagnet disappears, the valve body is driven in the valve closing direction by the biasing force of the spring, and the supply of gas to the large burner 11 is shut off. When the gas supply is cut off, the large burner 11 is extinguished, and the controller 3 detects that the large burner 11 has been extinguished from a decrease in the thermoelectromotive force of the thermocouple 31.

  Referring to FIG. 3, the motor safety valve 4 includes a stepping motor unit including a drive coil 41 and a rotor 42 at the top. When a driving pulse is supplied to the driving coil 41, the rotor 42 rotates in the forward and reverse directions by an angle corresponding to the number of pulses. At the center of the rotor 42, there is a screw rod 43 that is screwed into the rotor 42, and the screw rod 43 is prevented from rotating. Therefore, when the rotor 42 rotates, the screw rod 43 moves up and down.

  A movable electromagnet 44 is attached to the lower end of the screw rod 43. A valve body 45 is provided below the movable electromagnet 44, and a spring 46 is provided between the valve body 45 and the movable electromagnet 44 to urge the valve body 45 toward the valve port 45a. . In the illustrated state, the valve opening 45a is closed by the valve body 45, so that the motor safety valve 4 is in a closed state. Reference numeral 45 b denotes a movable iron piece connected to the valve body 45.

  When the rotor 42 is rotated from that state and the movable electromagnet 44 is moved downward in the figure, the movable electromagnet 44 comes into contact with the movable iron piece 45b, and when the movable electromagnet 44 is further lowered, the valve body 45 comes into close contact with the valve opening 45b. The movable electromagnet 44 is in close contact with the movable iron piece 45b. When the movable electromagnet 44 is energized and excited in this state, the movable iron piece 45 b is attracted to the movable electromagnet 44. Then, when the rotor 42 is reversed and the movable electromagnet 44 is pulled up while the movable electromagnet 44 is energized, the movable iron piece 45b is attracted and held by the movable electromagnet 44, so the valve body 45 is also lifted together and the valve port 45a is opened. To do. That is, the motor safety valve 4 is opened. When the energization of the movable electromagnet 44 is stopped in the valve open state, the valve body 45 is driven toward the valve port 45a by the biasing force of the spring 46, and the valve closed state shown in FIG. 3 is restored.

  Referring to FIG. 4, the flow shown in this figure is in a state where the power switch 10 is OFF, that is, all the gas burners are extinguished and the motor safety valve 4 and all the electromagnetic safety valves (52 and others) are closed. The large burner 11 is ignited and then extinguished.

  When the power switch 10 is turned on (S1), the value of the flag F, which is a variable set in the control program, is read from the memory in the controller 3. This memory is not a ROM but an EEPROM, which will be described later, and the written F value is sequentially rewritten, but the initial value written at the time of shipment from the factory is F = 0 (S2). After reading F, it waits until the fire extinguishing button 2 is pressed and the ignition switch is turned on. When the ignition switch is turned on (S3), the electromagnetic safety valve 52 is opened and the motor safety valve 4 is opened (S4). As a result, gas is supplied to the large burner 11, and the large burner 11 is ignited by the spark plug 11b.

  When cooking by the large burner 11 is completed and the fire extinguishing button 2 is pushed, the ignition switch is turned off (S5). If the other gas burner is in an ignition state, the electromagnetic safety valve 52 is closed and only the large burner 11 is extinguished. However, if a fire extinguishing operation is performed with only the large burner 11 being ignited, the electromagnetic safety valve 52 is opened. While maintaining the state, energization of the movable electromagnet 44 of the motor safety valve 4 is stopped to close the motor safety valve 4 (S6).

  If the large burner 11 is extinguished by the operation, it is determined that no valve opening failure has occurred in the motor safety valve 4 (S7), and the electromagnetic safety valve 52 is closed (S8). Then, the flag F is reset to 0 in the next step. However, since F = 0 in this state, the value of F remains unchanged and F = 0 remains unchanged (S9).

  The error notification is canceled (S10), and the process returns to step S3. However, since the error notification is not performed at this point, the state does not change even if step S10 for canceling the error notification is executed.

  Next, returning to step S7, the description will be continued. If the large burner 11 does not extinguish even when the energization of the movable electromagnet 44 of the motor safety valve 4 is stopped, a valve opening failure has occurred in the motor safety valve 4. Conventionally, the electromagnetic safety valve 52 is immediately closed here to prohibit subsequent ignition. However, in the present invention, the rotor 42 is rotated to move the movable electromagnet 44 toward the movable iron piece 45b. And the movable iron piece 45b is pushed with the movable electromagnet 44, and the valve body 45 is closely_contact | adhered to the valve port 45a (S11).

  If the large burner 11 is extinguished by this operation, the continuous use of the gas stove 1 is further permitted (S12). Then, after the electromagnetic safety valve 52 is closed in preparation for the next ignition (S13), 1 is added to F (S14) and an error is notified (S16). If F = 3, the process flows from step S15 to step S18. However, since F = 1 at the present time, the process returns to step S3 with the error notification kept.

  When the ignition operation is performed again, the fire extinguishing operation is performed (S5), and the fire extinguishing of the large burner 11 is confirmed (S7), even if the valve opening failure has occurred in the motor safety valve 4 last time, the valve opening failure has been eliminated. As a result, F is returned to 0 (S9), and the error notification is canceled (S10). If fire extinguishing cannot be confirmed in step S12, the electromagnetic safety valve 52 is closed as before (S17), and subsequent use is prohibited (S18).

  Even if fire extinguishing can be confirmed in step S12, if a valve opening failure occurs three times in succession, F = 3 in step 14 and subsequent use is prohibited (S18). . And all the above-mentioned histories are written in the EEPROM built in the controller 3 so that the histories can be called up and referred to at the time of the subsequent inspection and repair. Further, when the value of F changes, the value in the EEPROM is updated each time it changes, so that the latest value of F is always stored in the EEPROM. The history and the value of F stored in the EEPROM are retained even when the power switch is turned off.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Gas cooker 10 Power switch 11 Large burner 11a Branch pipe 11b Spark plug 12 Middle burner 13 Small burner 2 Point fire-extinguishing button 3 Controller 4 Motor safety valve 44 Movable electromagnet 45 Valve body 46 Spring 5 Thermal power control device 51 Thermal power control part 52 Electromagnetic safety valve

Claims (4)

  A gas supply pipe is provided with one main valve, and the downstream of the main valve is branched into parallel branch pipes for supplying gas to each of the plurality of gas burners, and each branch pipe is provided with an electromagnetic safety valve, and each gas burner is provided. When individually extinguishing the gas, the electromagnetic safety valve is closed.However, when extinguishing the gas burner alone, the electromagnetic safety valve remains open and a valve closing command is issued to the original valve. When the gas burner cannot be extinguished by the command, the solenoid valve is closed and the subsequent ignition is prohibited in the gas stove where the above-mentioned main valve is held open while being attracted to the movable electromagnet that is moved forward and backward by the motor. And a motor safety valve with a spring that drives the valve body in the valve closing direction when the attractive force of the movable electromagnet disappears. When extinguishing a gas burner that is burning alone, the movable electromagnet When the suction force is extinguished and the valve body is driven in the valve closing direction by the spring, and the gas burner is not extinguished by the spring drive, the movable electromagnet is moved to the valve body side by the motor and the valve body is closed by the movable electromagnet. When the gas burner is extinguished by pressing the gas burner, the gas stove is allowed to continue use without prohibiting subsequent ignition.   If the gas burner does not extinguish when the valve body is driven by the spring, an error is notified, and the subsequent use is permitted. If the gas burner is extinguished by the spring during the next fire extinguishing operation, the error notification is canceled. The gas stove according to claim 1 characterized by things.   3. The gas stove according to claim 1, wherein when the state in which the gas burner is not extinguished by driving the valve body by a spring continuously occurs a predetermined number of times, subsequent ignition is prohibited.   The gas stove according to any one of claims 1 to 3, wherein a history that the gas burner has not extinguished by driving the valve body by the spring is recorded in a memory.