JP2012087972A - Open type gas combustion appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open type gas combustion appliance of high usability, capable of preventing things that a user continuously performs an igniting operation without knowing a state of combustion stop due to detection of incomplete combustion, the number of times of stop immediately reaches the limited number of times, and the gas combustion appliance is interlocked.SOLUTION: A controller 22 brings a forbidden state for disabling a pressing operation of an operation button 7 for five minutes from forced stop of combustion, when the number of times of stop does not reach the limited number of times, in forcibly turning off a burner 4 in accompany with detection of abnormality in combustion, and stopping the combustion.

Description

  The present invention relates to an open-type gas combustion appliance such as a non-stop type water heater that takes combustion air from the room and discharges the combustion gas as it is.

  Conventionally, as described in Patent Document 1, for example, in the above open type gas combustion appliance, incomplete appliance combustion is detected when incomplete combustion is detected in order to prevent the appliance from being used continuously with incomplete combustion. Is provided with an incomplete combustion prevention function for stopping combustion in The open-type gas combustion appliance described in Patent Document 1 counts the number of forced combustion stops associated with the detection of incomplete combustion, and when the number of stops reaches a predetermined limit number, the maintenance of parts is performed. In other words, the equipment is prohibited from being reused (so-called interlock is applied) until it is replaced.

JP 2000-266344 A

  However, according to the open-type gas combustion appliance described in Patent Document 1, the user does not know that the combustion has stopped due to the detection of incomplete combustion, and misunderstood that the combustion may not be successful due to other causes. Thus, the ignition operation may be performed continuously, and the number of stops may reach the limit number immediately, that is, it may be interlocked.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an easy-to-use open-type gas combustion appliance without causing the above-described situation.

In order to achieve the above object, the invention according to claim 1 of the present invention is directed to monitoring means for monitoring the combustion state in the appliance, and forcibly burning when an abnormality is detected in the combustion state by the monitoring means. An open-type gas combustion appliance comprising: a stopping means for stopping, a counting means for counting the number of forced stops, and an interlock means for interlocking the appliance when the number of stops reaches a predetermined limit number. Prohibiting means for prohibiting combustion in the appliance for a predetermined time after forcibly stopping combustion when the stopping means forcibly stops combustion and the number of stops has not reached the limit number Is provided.
According to a second aspect of the present invention, in the first aspect of the present invention, there is provided an informing means for informing that combustion is prohibited by the prohibiting means.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the prohibiting unit determines the predetermined time according to the number of stops.

According to the present invention, when the combustion is forcibly stopped by the stop means and the number of times of the stop has not reached the predetermined limit number, the combustion in the appliance is prohibited for a predetermined time after the combustion is forcibly stopped. For example, the user can perform ignition operations such as operating the operation buttons continuously, preventing the situation where the number of stops reaches the limit number and the interlock is applied. can do.
Further, according to the invention described in claim 2, since the notification means for notifying that the combustion is prohibited by the prohibition means is provided, it is possible to forcibly stop the combustion or prohibit the combustion of the user. It can be clearly notified that it is due to the prohibition means. Furthermore, the fact that the prohibiting means prohibits combustion means that an abnormality is detected in the combustion state, and therefore it is possible to prompt the user to eliminate combustion abnormality such as indoor ventilation.
Further, according to the invention described in claim 3, since the prohibiting means determines the predetermined time according to the number of stops, for example, by setting the predetermined time longer as the number of stops approaches the limit number, There is an effect that the concentration deficiency is surely solved by ventilation for a sufficient time, and the number of stops can be easily prevented from reaching the limit number.

It is a structural diagram of a water heater. It is a block block diagram of a water heater. It is the flowchart figure which showed the operation control in the controller.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a non-stop water heater (hereinafter simply referred to as “water heater”) according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a structural diagram of the water heater 1, and FIG. 2 is a block diagram of the water heater 1.
The water heater 1 mainly burns heat in the combustion exhaust from the burner 4 that burns a mixed gas of fuel gas and primary air in the combustion chamber 2 and passes water in the heat transfer tube. A heat exchanger 5 for heating is provided. A water supply pipe 3 connected to the water supply is connected to the water inlet side of the heat exchanger 5, and a hot water discharge pipe 6 is connected to the water outlet side. The water from is heated and sent out as hot water from the hot water discharge pipe 6. Further, on the upstream side of the water supply pipe 3, a faucet 9 that opens and closes via a lever 8 by a push operation of the operation button 7 and a primary pressure chamber 11 of the diaphragm 10 are arranged downstream of the primary pressure chamber 11. The formed venturi 13 is connected to the secondary pressure chamber 12 of the diaphragm 10 through the differential pressure tube 14. Further, a projecting rod 15 is connected to the diaphragm 10, and when water is passed into the water supply pipe 3 with the opening of the faucet 9, the secondary pressure chamber 12 is passed through the venturi 13. When the pressure is lower than that of the primary pressure chamber 11 and the diaphragm 10 moves to the secondary pressure chamber 12 side, the projecting rod 15 is interlocked with the movement of the diaphragm 10. Further, when the projecting rod 15 is operated in conjunction with the diaphragm 10, the valve opening mechanism 16 a of the magnet electromagnetic valve 16 disposed in the gas flow path to the burner 4 is operated and opened, and then the water pressure responsive valve 17 is opened. The valve opens. In addition, a switch 21 for detecting the pressing operation of the operation button 7 is connected to the controller 22, and when the switch 21 is turned on, power is supplied to the magnet electromagnetic valve 16 to maintain the valve open state. It has become so. Reference numerals 19 and 20 denote water pressure switches that are sequentially turned on when the magnet electromagnetic valve 16 and the water pressure responsive valve 17 are opened, and are connected to a controller 22 that controls various operations of the water heater 1. An instrument plug 18 is provided on the downstream side of the water pressure responsive valve 17 in the gas flow path to open when the operation button 7 is pushed.

  On the other hand, an ignition electrode 23 and an igniter 24 for igniting the burner 4 and a frame rod 25 for detecting a flame are connected to the controller 22 and provided near the sensing burner 4 a provided to the burner 4. The primary thermocouple 26 and the secondary thermocouple 27 provided above the burner 4 and facing the inner trunk window (not shown) below the heat exchanger 5 are opposite in the polarity of (+) (−). Are connected in series. The combined electromotive force of the primary thermocouple 26 and the secondary thermocouple 27 is input to the controller 22, so that the controller 22 can detect incomplete combustion in the burner 4. In addition, 28 is a dry cell, 29 is an LED lamp for battery replacement time, and 30 is a notification LED lamp for reporting the detection of incomplete combustion.

Here, the operation control in the controller 22 which is a main part of the present invention will be described based on the flowchart of FIG.
First, when the user pushes the operation button 7 (S1) and detects that the switch 21 is turned on as a result of the push-in operation, the controller 22 determines whether or not it is in a prohibited state described later (S2). At the beginning of use, naturally it is not in a prohibited state (determined as NO in S2), so that the faucet 9 and the diaphragm 10 are actuated to start the water flow and the magnet solenoid valve 16 and the like are opened as described above. At this time, the burner 4 is ignited by performing an ignition operation such as supplying electric power to the magnet electromagnetic valve 16 or sparking the ignition electrode 23 in S3. After ignition, the combined electromotive force of the primary thermocouple 26 and the secondary thermocouple 27 is monitored until a fire extinguishing operation such as operating the operation button 7 again is performed (YES in S4). It is determined whether or not the combustion in No. 4 is normal combustion (S5). And when there is no abnormality in particular (continues normal combustion), the fire extinguishing operation such as shutting off the gas supply by stopping the power supply to the magnet solenoid valve 16 triggered by the fire extinguishing operation, etc. (S6) and extinguish the burner 4. In addition, the water pressure responsive valve 17 is activated as the magnet electromagnetic valve 16 is closed, the diaphragm 10 is also activated, and the water flow is stopped. In addition, about the monitoring of the combustion state of the burner 4 using the primary thermocouple 26 and the secondary thermocouple 27, it carries out by the well-known method as described also in the said patent document 1, for example.

On the other hand, in S5, when the combustion abnormality of the burner 4 due to insufficient oxygen concentration in the room or fan blockage, that is, incomplete combustion of the burner 4 is detected, the controller 22 detects the magnet solenoid valve 16 regardless of whether or not the fire extinguishing operation is performed. The burner 4 is forcibly extinguished by closing the valve to stop the combustion (S7), and the number of forced stop of combustion is incremented by 1 as the occurrence of combustion abnormality (S8). In S9, it is determined whether or not the count value of the number of stops due to the occurrence of combustion abnormality is 3 or less. If it is 3 or less (YES in S9), the operation button 7 is pressed. A notification operation is started (S10) in which the switch is made invalid (that is, the switch 21 is determined to be invalid) and the notification LED lamp 30 blinks. Then, when shifting to the prohibited state, even if the operation button 7 is pushed in, ignition operation such as supply of electric power to the magnet electromagnetic valve 16 and spark of the ignition electrode 23 is not executed. Further, as a result of the determination in S2, the process proceeds to S12, and by determining whether 5 minutes have elapsed since the transition to the prohibited state, the prohibited state and the notification operation are continued for 5 minutes. After that, when 5 minutes have elapsed (determined as YES in S12), the prohibition state is canceled to return to the normal state in which the pressing operation of the operation button 7 is enabled, and the notification operation by the notification LED lamp 30 is stopped. (S13).
On the other hand, when the combustion abnormality is detected again after passing through the above-described prohibited state and the like, and the number of forced stop of combustion reaches a total of four times (the limit number) (determined NO in S9), an interlock is applied. (S11) Reuse of the water heater 1 is prohibited until the parts are maintained or replaced.

According to the water heater 1 having the above-described configuration, when the combustion is stopped by forcibly extinguishing the burner 4 upon detection of a combustion abnormality, if the number of stops does not reach the limit number, It is in a prohibited state in which the pressing operation of the operation button 7 is disabled for 5 minutes after the forced combustion is stopped (that is, combustion in the burner 4 is prohibited for 5 minutes). Therefore, it is possible to prevent a situation in which the user continuously operates the operation button 7 and the number of stops immediately reaches the limit number and the interlock is applied.
Further, since the notification operation using the notification LED lamp 30 is continuously performed during the prohibited state, the forced stop of combustion or the prohibition of combustion has shifted to the prohibited state for the user. This can be clearly notified. Furthermore, since the transition to the prohibited state means that an abnormality has been detected in the combustion state, it is possible to prompt the user to eliminate the combustion abnormality such as indoor ventilation.

  The configuration related to the open type gas combustion appliance of the present invention is not limited to the aspect of the above embodiment, and the overall configuration of the open type gas combustion appliance, the configuration related to the prohibited state, etc. As long as it does not deviate from the above, it can be changed as necessary.

For example, in the above-described embodiment, a configuration is adopted in which the prohibition state is always continued for 5 minutes regardless of the number of times of transition to the prohibition state. For example, the first time is 5 minutes, and the second time is 7 For example, the duration of the prohibited state may be determined according to how many times the prohibited state is set, such as 10 minutes for the third time. And by adopting this configuration, as the number of stops approaches the limit number, for example, insufficient oxygen concentration in the room is surely resolved by ventilation for a sufficient time, so that the number of stops does not easily reach the limit number There is an effect that it can be planned. Needless to say, the duration of the prohibited state is not limited to 5 minutes in the above embodiment.
The same applies to the notification operation, and the mode of the notification operation is changed according to the number of prohibited states (for example, for the third time, the notification LED lamp 30 is blinked during the prohibited state. It may be configured such that the lamp is kept on without being illuminated).

Furthermore, a buzzer or the like may be provided as a notification means, and is not limited to the notification LED lamp of the above embodiment.
In addition, it goes without saying that the above-described configuration relating to the prohibited state and the like can be applied to other open-type gas combustion appliances other than the water heater (for example, a first-stop type water heater).

  1 ... Hot water heater 2 ... Combustion chamber 3 ... Water supply pipe 4 ... Burner 5 ... Heat exchanger 6 ... Hot water pipe 7 ... Operation button 16 ... Magnet solenoid valve 21..Switch, 22..Controller (monitoring means, stopping means, counting means, interlock means, prohibiting means), 23..Ignition electrode, 26..Primary thermocouple (monitoring means), 27..Secondary thermoelectric Pair (monitoring means), 30 ..LED lamp for notification (notification means).

Claims (3)

Monitoring means for monitoring the combustion state in the instrument, stop means for forcibly stopping combustion when an abnormality is detected in the combustion state by the monitoring means, counting means for counting the number of forced stops, and the stop An open type gas combustion appliance provided with interlock means for interlocking the appliance when the number of times reaches a predetermined limit number,
Providing forbidden means for prohibiting combustion in the appliance for a predetermined time after forcibly stopping combustion when the stop means forcibly stops combustion and the number of stops has not reached the limit number An open type gas combustion appliance characterized by the above.   The open-type gas combustion appliance according to claim 1, further comprising a notification unit that notifies that combustion is prohibited by the prohibition unit.   The open type gas combustion appliance according to claim 1, wherein the prohibiting unit determines the predetermined time according to the number of stops.

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