JPS60129525A - Controller of bath - Google Patents

Abstract

PURPOSE:To prevent heating of an empty bath boiler due to misoperation of an operation switch, by a method wherein when disorder such as momentary power failure has occurred on a supply power source, restarting or suspension of combustion operation after restoration of the power source is determined based on a matter whether the combustion operation has been performed prior to the disorder of the power. CONSTITUTION:When momentary power failure is generated, an output of a control part 9 including a close state of a fuel controller 2 is turned OFF wholly once. When a power source 10 is restored at a time T4, an operation switch 6 is kept at an ON state as it was and an output of a charge and discharge timer 11 is kept at an ON state as it was also. Judgement of momentary suspension of power is performed by a judging part 12 in a predetermined period (corresponding to the period from a time T0 to a time T1) from the time T4 to a time T5. An output of the judging part 12 is turned into an ON signal upon completion of a timer period of the charge and discharge timer 11. Combustion operation is restarted through the ON output of the decision part 12. The titled controller possesses such function that when it was found that a condition wherein the power source was applied to a control circuit was temporary suspension of the power source during combustion operation, the combustion operation is restarted, but otherwise the same operation is not made to perform.

Description

DETAILED DESCRIPTION OF THE INVENTION The industrial application field El11 relates to means for determining conditions for starting combustion operation of a bathtub using gas as fuel.

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 controls an operation switch 6 that instructs to start and stop combustion, a flame detector *7 that monitors the combustion flame of the combustor 1, an igniter 8 that ignites gas fuel, and a fuel controller 2. It consists of a control section 9. Further, 10 is a power source. The control unit 9 starts the combustion operation when the operation switch 6 is turned on while the power supply 1O is being supplied. The procedure for combustion operation is to supply gas fuel to the combustor 1 by turning the closed fuel controller 2 into an open state. Next, the igniter 8 is operated to cause a spark discharge between the electrodes of the combustor 1 and the igniter 8. This spark discharge is performed continuously to ignite the gaseous fuel discharged from the combustor 1. The water in the heat exchanger 3 is heated by combustion of the gas fuel. Due to the rise in temperature of the water in the heat exchanger 3, the water in the bathtub 4 and the water in the heat exchanger 3 flow between the upper circulation port, which is a water passage connecting the bathtub 4 and the heat exchanger 3, and the lower circulation port. It circulates naturally through the circulation port. The natural circulation warms the hot water in the bathtub 4. Further, the control unit 9 monitors the combustion flame of the combustor 1 using the output signal of the flame detector 7. When the flame detector 7 detects an abnormality in the combustion flame such as a misfire, the control unit 9 immediately closes the fuel controller 2 to take a safety measure to stop the gas fuel from flowing into the atmosphere. When the power supply 1O is supplied to the control unit 9, if the operation switch 6 is in the ON state, the control unit 9 starts the combustion operation described in 1.f, but this carries the risk of dry firing. The reason for this is that the operation switch 6 is located inside the bathroom.
In addition, the power supply, section or power supply switch is located outside the bathroom. This is because the device has multiple functions such as hot water supply in addition to bathing, and there is a high risk of forgetting to operate it due to the number of operating locations, such as supplying power to use functions other than bathing.

In order to solve the above-mentioned problem, if the operation switch is already in the ON state when the power supply 10 is supplied to the control unit 9,
A method has been proposed for controlling Akita 49 that determines that the operator has forgotten to operate the operation switch and does not perform combustion operation. This allows the combustion operation to be performed only when it can be determined that the user operated the operation switch 6 (by me).
This prevents dry firing. However, if a power supply abnormality such as a momentary power outage or voltage drop occurs after the combustion operation has been started through normal operation, the combustion operation will not be restarted even after the power supply is restored to normal. This may cause problems such as the water not boiling when you try to take a bath.
It has become difficult to operate. In particular, as mentioned above, instantaneous power outages and voltage drops are often inconvenient for users.

Purpose of the Invention The present invention solves the above-mentioned problems of the prior art.If the operation switch is on when power is supplied to the control circuit, it is possible that the operation switch has been forgotten, or To provide a control device for a bathtub that determines whether there is a power outage or voltage drop, restarts combustion operation when the instantaneous power outage or voltage drop returns, and does not perform combustion operation when an operation is forgotten.

Structure of the Invention To achieve this object, the present invention includes a combustor, a fuel controller that supplies gas fuel to the combustor, a heat exchanger and bathtub that heat water with the combustion heat of the combustor, and When the operation switch is on, the output signal of the charge/discharge timer that charges during combustion operation and discharges when stopped is active, and if the timer transitions to end Y within a predetermined time, combustion operation will be restarted. It consists of a control circuit. This configuration has the effect of restarting the combustion operation when the power is supplied to the control circuit and the power is temporarily cut off during the combustion operation, and preventing the combustion operation otherwise.

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

Reference numeral 5 designates a control circuit that includes an operation operation switch 6, a flame detector 7 that detects the combustion flame of the combustor 1, a discharger 11 that charges during combustion operation and discharges when stopped, and determines the state when power is supplied. a determination section 12 and a control section 9 that controls the fuel control section 2 and the igniter 8 based on output signals from each section;
has. 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 10 is supplied to control circuit 5 at time T'O. time T
Judgment unit 1 at a certain time from o to T1
2, the on/off signal of the charging/discharging unit 11 and the driving operation switch . . . Chiroiwa is determined. The determination by the determination unit 12 is based on the time To
If the output signal of the charge/discharge timer 11 is in the ON state during the time T1 from then, the operation operation switch 6'I7) outputs the state as is, and the output □ signal of the discharge timer 11 is OFF and the operation operation switch 6 is ON. When the operation switch 6 is turned off, the off state is memorized until it is turned on again.
Output off. After time T1, if there is no memory of the OFF state, the state of the driving operation switch 6 is output as is. In FIG. 3, since the driving operation switch 6 is OFF, the determination unit 12 outputs OFF. When the driving operation switch 6 is turned on at time T2, the determination unit 12 outputs ON. The control unit 9 performs combustion operation by inputting the main number 3 of the determination unit 12. Combustion operation is conventional I! The fuel controller 2 is changed from the open state to the open state in the same manner as shown in FIG. 1J to supply gaseous fuel to the combustor 1. At the same time, turn on igniter 8,
A spark discharge is caused to occur continuously between the electrode of the combustor 1 and the combustor 1, and the gas fuel is ignited. Ignition is monitored by a combustion flame detector 7. After the ignition is detected, the igniter 8 is turned off, and the state of the combustion flame is constantly monitored from then on until the combustion operation is stopped.

When a combustion flame abnormality such as a misfire is detected, the fuel controller 2 is closed to stop supplying gas fuel. Note that, at the same time as the fuel controller 2 is opened, the discharge timer 11 starts charging operation. When the operation switch 6 is turned off at time T3, the fuel controller 2 is closed and the combustion operation is stopped.

At the same time, the discharge bearer 11 shifts to a discharge operation. Control of the fuel controller 2, igniter 8, and charge/discharge timer 11 described above/d
Controlled by IIJ control section 9. The control unit 9 generally uses a controller such as a microcomputer.

Figure 4 shows the operation in the event of an abnormality. At time To, the power source 1O is supplied to the control circuit 5, and at time T2, the operation operation switch 6 is turned on to start combustion operation. When a momentary power outage occurs from time T3 to time T4, all outputs of the control unit 9 are turned off at one end, including the closed state of the fuel controller 2. When the power supply 10 is restored at time T4, the operation switch 6 remains on, and the output of the charging/discharging unit 11 also remains on. The determining unit 12 performs instantaneous power outage determination at a predetermined fixed time (corresponding to the time T1 from To described above), 15 hours from T4. The output of the determination unit 12 becomes an ON signal after the timer time of the charge/discharge timer 11 ends. The opening and closing at the discharge timer is a safety measure to confirm that there is no circuit abnormality in the charge/discharge timer 11. The combustion operation is restarted again when the determination unit 12 outputs an ON signal. Time T6 is when the operation switch 6 is turned off to stop the combustion operation. From time T7 to T8, the combustion operation is performed again.

The appropriate discharge time of the discharge timer 12 is about 1 to 3 seconds. Further, the fixed time of the control section 9 is about 1 second. Generally, instantaneous power outage time is about several hundred milliseconds, so if you set the above-mentioned time, you can easily detect instantaneous power outage, and it also prevents the operability of the operation switch/y switch from becoming worse. do not have.

Next, the configuration of the discharge timer 12 will be shown. The discharge capacitor 12 includes a charge control resistor 14, a capacitor 15, and a control section 9.
A resistor 16, a transistor 17, and a diode 1 which control the charging of the capacitor 15 by receiving the output signal of
8, a discharge resistor 19, a discharge circuit 20, and a diode 21.

The discharge collector 11 controls the charging and discharging of the capacitor v15 by turning on/off the transistor 17 using the output signal of the control section 9 based on the above-described configuration. The type opening is determined by the discharge resistor 19 and the content 15.

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

When an abnormality occurs in the power supply, such as a momentary power outage or voltage drop, the operation control switch is used to determine whether to restart or stop combustion operation after power is restored, depending on whether combustion operation was in progress before the power failure. It is possible to prevent the bath kettle from heating up empty due to incorrect operation.

Furthermore, combustion is stopped automatically, which eliminates problems such as water still being present when taking a bath, making it more convenient to use. It is also safe because combustion operation starts only when the charge/discharge timer circuit is normal.

[Brief explanation of the drawing]

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... Combustion controller, 3
... Heat exchanger, 4 ... Bathtub, 5 ...
...Control circuit, 6...Driving operation switch, 9
...Control unit, 10...Power supply, 11...
...Charge/discharge timer, 12... Patri fixed capital. Name of agent: Patent attorney Toshio Nakao and 1 other person
3 Figure 4

Claims (1)

[Claims] a combustor, a fuel controller that controls fuel supply to the combustor, a heat exchanger that warms water by combustion in the combustor, and a bathtub that boils water by circulating hot water heated by the heat exchanger; Consisting of a control circuit that controls the fuel controller, vtJ #!
bf) The 11 circuit includes an operation operation switch that instructs to start and stop the combustion, a charge/discharge timer that charges and discharges in synchronization with the start and stop of the combustion, and when power is supplied to the control circuit, the operation A bath control device that has a determination unit that determines whether combustion is on or off based on an operation switch and an output signal from a discharge timer.