JPS608622A - Controller for bath - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a trouble, in which water is cold when a user takes a bath, by a method wherein, when an operation control switch is in an ON- state during the supply of a power source, it is decided by means of the output signal of a flame detector whether the operation control switch is erroneously operated or a momentary power outage occurs or a voltage is decreased, and when the momentary power outage occurs or a voltage is decreased, combustion is continued. CONSTITUTION:In case a power outage occurs at t3 time during combustion, a fuel controller 2 is brought to an OFF-state due to stop of the supply of a power. When a power source is restored at a time t4, an operation control switch 6 remains to be brought to an ON-state and a flame detector 7 displays a flame detecting state because of a heat time constant. An operation starting deciding part 11 turns ON the fuel controller 2 again from a time t5, in which, when a power source 9 is restored, the operation control switch 6 is in an ON-state, and the output of a flame detector is in a flame detecting state and is changed over to a detecting state within a given time T, and actuates an ignitor 10 to continue combustion. A flame is detected by the flame detector 7 at a following time t6, and combustion is effected until a time t7, in which the operation control switch 6 is turned OFF, to heat bath water.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to means for determining conditions for starting combustion operation of a gas-burning bathtub.

Conventional structure and problems thereof The structure of a conventional gas bath boiler is shown in FIG. In FIG. 1, 1 is a combustor, 2 is a fuel controller, 3 is a heat exchanger, 4 is a bathtub, and 5 is a control circuit. The control circuit 5 includes an operation switch 6 , a flame detector 7 that monitors the combustion flame of the combustor 1 , and a control section 8 that controls the fuel controller 2 . The control unit 8 is
When the operation switch 6 is turned on while the power source 9 is being supplied, the fuel controller 2 is opened and gaseous fuel is supplied to the combustor 1. Simultaneously with the opening operation of the fuel controller 2, the igniter 10 is caused to continuously discharge between the electrodes of the combustor 1 and the igniter 10, and the gaseous fuel discharged from the combustor 1 is ignited. By igniting the gas fuel, the combustor 1 heats water in the heat exchanger 3. When the water in the heat exchanger 3 is boiled, the water in the bathtub is naturally circulated through the upper circulation port and the lower circulation port to boil the water in the bathtub. Further, when the flame detector 7 detects an abnormality in the flame of the combustor 1, the control unit 8 immediately closes the fuel controller 2 to prevent raw gas from flowing out. On the other hand, if the operation switch 6 is turned on when the power supply 9 is supplied to the control section 8, the control section 8 determines that the operation operation switch 6 has been operated incorrectly and does not perform combustion. This is designed to cause combustion only when the user operates the operation control switch 6. If a power failure occurs, such as preventing dry firing, combustion will not occur after the power is restored, and when the user tries to take a bath. , problems such as water in the bathtub may occur. In particular, the occurrence of the instantaneous power outage, voltage drop, etc. mentioned above is often unknown to the user, which is inconvenient.

Purpose of the Invention The present invention solves the problems of the prior art described above. When the operation switch is on when power is supplied, the output signal of the flame detector is detected due to erroneous operation of the operation switch or a momentary power outage. To provide a control device for a bathtub which improves operability by determining whether the electricity has decreased by an amount of i and continuing combustion when there is a momentary power outage or voltage drop.

Structure of the Invention To achieve this objective, the present invention includes a combustor, a fuel controller that controls the fuel supply to the combustor, a heat exchanger and bathtub that heat water with the combustion heat of the combustor, and a It is comprised of a control circuit that continues combustion if the output signal of the flame detector is in a flame detection state when the operation switch is on, and the flame is not detected within a predetermined time. This configuration has the effect of continuing bath combustion when the state when power is supplied to the control circuit is recovery from a momentary power outage.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2, 3, and 4. FIG. 2 is a block diagram of the gas bath of the present invention. In Figure 2, the same months as in Figure 1 are given the same numbers.

5 is a control circuit that includes an operation switch 6, a flame detector 7 of the combustor 1, a controller 8 that controls the fuel controller 2, and a power source 9.
It has an operation start determination section 11 that determines the state when the fuel is supplied. The operation of the control circuit 5 will be explained using the timing diagrams of FIGS. 3 and 4. FIG. 3 shows steady state operation. Power source 9 is at time t. When the operation switch 6 is turned on at time t while fuel is being supplied to the control circuit 5, the controller 8 turns on the fuel controller 2, and at the same time continuously discharges the igniter 10. The gas flowing out from 2 is ignited. When the gas is ignited, the flame detector 7 detects the flame (
t2 hours). After that, the time t for turning off the operation switch 6
Continue burning until 7.

FIG. 4 shows a case where there is a power outage for 14 hours starting from time t in the middle of combustion. If there is a power outage during 13 hours during combustion, the fuel controller 2 will be turned off because the power supply will stop. When the power is restored at time t4, the operating switch 6 remains on and the flame detector 7 indicates a flame detection state due to the thermal time constant. The operation start determination unit 11 determines the time t when the operation operation switch 6 is in the ON state when the power supply 9 is restored, the output of the flame detection @ is in the flame detection state, and the transition is made to the non-detection state within a predetermined time T.
5, the fuel controller 2 is turned on again and the igniter 10 is operated to continue combustion. Thereafter, the flame detector 7 detects the flame at time t6, and combustion continues until time t7 when the operation switch 6 is turned off to boil the bath. The flame detector described so far uses a thermocouple with a time constant of several seconds. Further, when the power is restored at time t4, the output of the flame detector 7 is changed for a predetermined time T from the flame detection.
The reason for starting combustion after detecting that the flame has shifted to undetected is to prevent failure of the flame detector 7 and to improve safety.

Effects of the Invention As described above, the gas bath control device of the present invention provides the following effects.

(1) When an abnormality occurs in the power supply, such as a momentary power outage or voltage drop, whether or not combustion has been carried out before the power failure occurs will determine whether or not combustion will continue after the power is restored, or if the interruption will last longer. This improves usability by preventing problems such as when combustion is stopped uniformly or when water is found when trying to take a bath.

(2) It is safe because combustion starts only when the flame detector is normal.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional gas bath, FIG. 2 is a block diagram of a gas bath showing an embodiment of the present invention, and FIGS. 3 and 4 are timing diagrams thereof. 1... Combustor, 2... Fuel controller, 3...
・Heat exchanger, 4... bathtub, 5... control circuit,
6... Operation operation switch, 7... Flame detector, 11...
- Operation start determination section. Name of agent: Patent attorney Toshio Nakao and 1 other person
Figure 2

Claims (1)

[Claims] A combustor, a fuel controller that controls fuel supply to the combustor, a heat exchanger that warms water during combustion in the combustor, and a bathtub that boils water by circulating warm water in the heat exchanger. , a control circuit that controls the fuel controller; the control circuit includes a flame detector that detects a combustion flame of the combustor; an operation switch that instructs to start and stop combustion; and the control circuit. A control device for a bath having an operation start determination device that determines the start or stop of combustion depending on the states of the operation operation switch and the flame detector when power is supplied to the bath.