JPH0333968B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a safety device for oil supply devices such as gas and oil instantaneous water heaters.

(Prior art) Conventionally, in order to prevent oxygen deficiency accidents in gas instantaneous water heaters installed indoors, a timer is built into the controller to prevent the appliance from operating for more than a certain period of time (for example, one hour). The timer counts up to stop combustion and stop the appliance from operating. Such timer control is also useful in outdoor installations, since it is unlikely that the water heater will be used continuously for more than, say, an hour. Therefore, conventionally, as shown in Figure 3, water flow at the set flow rate is detected when the hot water tap is opened (F-1), and it is determined whether there is an abnormality in a detector such as a thermistor for detecting hot water temperature (F-2). )
If there is no abnormality, set the timer (F
-3), the combustion loads such as the gas valve 7 and the supply/exhaust fan 8 are activated (F-4) to start hot water supply, and the combustion time during hot water supply is counted (F-11), and this timer starts counting up. If the operation is completed (F-5), the operation of the combustion load is stopped (F-6), and the combustion load is held in the stopped state until a reset operation is performed. When the reset operation is performed, the process moves to step (F-1). (F-7). In addition, in water heaters, detectors, such as the thermistor for detecting the hot water temperature mentioned above, may have an abnormality that can be restored to normal, such as water droplets adhering to the electrical equipment, and if such an abnormality is detected during hot water supply (F-8), After the operation of the combustion load is stopped (F-9), the process proceeds to the water flow detection step (F-1). Therefore, according to this control operation, when an abnormality of the detector is determined during hot water supply, the above-mentioned step (F-6),
The system moves to a combustion standby state where it is not restricted to a combustion stop state like (F-7), and when the detector returns to normal, combustion is immediately resumed and hot water supply is restarted. I'm trying to improve my sexuality.

(Problem to be Solved by the Invention) However, in the conventional system, as shown in Fig. 3, the timer is activated when the detector returns to normal after transitioning to step (F-1) where the combustion standby state occurs when an abnormality is detected. Since it is set again (F-3), when such an abnormality occurs, combustion will continue for longer than the set time of the timer. Therefore, the conventional devices lacked safety against oxygen deficiency and from forgetting to close the hot water tap.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems of the conventional example, and for this purpose, the present invention counts the combustion time using a timer set by water flow detection. In a device that stops combustion when a timer counts up and locks it in the stopped state,
When an abnormality is detected in the detector, the system is configured to shift to a combustion standby state, which becomes a combustion state when the detector returns to normal, and to interrupt the counting operation of the timer.

(Example) In Fig. 1, 1 is a heat exchanger;
A flow rate detector 3 and a thermistor 4 for detecting hot water temperature are provided in the water channel 2 connected to the water channel 2, and a hot water tap 5 is provided at the end of the water channel 2, such as the kitchen or bathroom.
6 is a gas burner, gas is supplied to the gas burner 6 via a gas valve 7, and combustion air is sent by a fan 8. 9 is a rotation speed detector of the fan 8. 10 is a controller, which includes the flow rate detector 3,
Detection signals from the thermistor 4 and rotation speed detector 9 are input. Then, the controller 10 executes the flowchart shown in FIG.

The flowchart shown in FIG. 2 is the flowchart shown in FIG. 3 with steps (F-12) to (F-14) explained below added. Step (F-
Since the control flow from step 1) to step (F-11) is the same as that shown in FIG. 3, the explanation thereof will be omitted.

In the present invention, the presence or absence of an abnormality in the detector is determined during hot water supply (F-8), and if it is determined that there is an abnormality, the operation of the combustion load is stopped (F-12), and then the presence or absence of water flow is determined. (F-13), water flow stops, i.e. hot water tap 5
When the tap is closed, the water supply has been stopped, so the process moves to step (F-1), and if water continues to flow, it is determined again whether there is an abnormality in the detector (F-14). ). In this case, if the detector continues to be abnormal, the process moves to step (F-13);
A control flow will be executed in the cycle from step (F-14) to step (F-13), and while this flow is being executed, combustion will be stopped and the timer will not count, and the timer's counting operation will be interrupted. It remains as it was.

When it is determined in step (F-14) that the detector has returned to normal, the process proceeds to step (F-4).
The combustion load is activated again and hot water supply is restarted, and the timer also restarts the above-mentioned counting operation, and when the timer counts up, the combustion load operation is stopped (F- 6) and is held in a stopped state (F-) until a reset operation is performed.
7) It will be done.

(Effects of the Invention) From the above, according to the present invention, even when an abnormality occurs, the combustion time does not exceed the set time of the timer, so compared to the conventional example, safety against oxygen deficiency and forgetting to close the hot water tap is improved. can be done.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a flowchart of the main parts of the controller in the same example, and FIG. 3 is a flowchart of the main parts of the conventional example.

Claims (1)

[Claims] 1. Combustion time is counted by a timer set by water flow detection, and when the timer counts up, combustion is stopped and restricted to the stopped state, and when an abnormality is detected by the detector, the combustion will be in the combustion state when normality is restored. A safety device for a water heater, characterized in that it causes the water heater to enter a standby state and also interrupts the counting operation of the timer.