JP3136689B2 - Burning appliances - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of a burning appliance such as a gas instantaneous water heater.

[0002]

2. Description of the Related Art In a gas instantaneous water heater using a dry battery as a power source, the dry battery is consumed as the operating time elapses, and the terminal voltage of the dry battery decreases. When the voltage between the terminals of the dry battery falls below the required operating voltage of an electromagnetic valve or an igniter that ignites a burner that controls opening and closing of a gas supply passage as a control means, the gas supply passage is closed by the electromagnetic valve and continuation of combustion is stopped. You. Therefore, it is determined that the life of the battery has expired and the battery is replaced.

[0003]

However, before the end of the battery life, the voltage between the terminals of the dry battery is considerably reduced, and the igniter is out of a discharge cycle in which the burner can ignite the burner with high probability. In addition, when bad conditions overlap, especially at low temperatures, there is a danger of explosion and ignition due to delayed ignition.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a battery that can be used for a little longer time and that a burning appliance can be used safely.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, the means of the burning appliance of the present invention comprises a dry cell for a power supply , input means for operating instructions of the appliance, and input of a control signal.
Control means for operating the appliance, and control means for controlling the control means.
Monitors the voltage between the control circuit and the terminals of the dry battery and compares it with the specified value
And a battery for instructing the control means whether or not the appliance can be operated.
Checking means, and a voltage between terminals of the battery checking means.
Pressure monitoring period only for a predetermined period after the input instruction of the input means
And timer means for instructing the timer .

[0006]

According to the above-mentioned means, in the combustion appliance of the present invention, the dry battery is exhausted and the driving power of the control unit is not sufficiently supplied, and the control unit cannot operate with a high probability. In such a case, the battery check means detects that the voltage between the terminals of the dry battery has become equal to or less than a predetermined value, and inputs an instruction signal indicating that the operation cannot be started or the operation cannot be continued to the control circuit. The control circuit that has received this instruction signal does not output a control signal to the control means at the start of operation, stops outputting a control signal to each control means being driven during operation continuation, and operates the appliance. Stop.
In this way, unsafe operation of the appliance due to uncertain driving of the control means can be avoided.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, wherein 1 is a dry battery for power supply, 2 is a power switch as input means for starting the appliance, 3 is a control circuit, and 9 is a terminal voltage of the dry battery 1. The battery check means 10 is a timer means for instructing the battery check means 9 to suspend the monitoring operation.
5 is an LED (light emitting element), 18 is an igniter for ignition as control means, 29 is an electromagnetic valve as control means for controlling opening and closing of a gas supply passage, 29a is a holding coil of the electromagnetic valve 29, 29b is an electromagnetic valve 29 2 shows the suction winding of FIG. Control circuit 3
Includes a clock 4 for outputting a clock pulse, an AND circuit element 5, an igniter drive circuit 6, a drive circuit 7 for opening the solenoid valve 29, a drive circuit 8 for keeping the solenoid valve 29 open after opening, and the like. The transistors 12, 14, 17, 20, 22, 25, 27 and the resistors 11, 13, 16, 19, 21, 24, 27, and the holding winding 29a and the attracting winding 29b are connected in parallel to the transistors 12, 14, 17, 20, 22, 25, 27, respectively. The control device has the diodes 23 and 28 provided.

FIG. 2 shows signal waveforms at various parts when the terminal voltage V _cc (voltage across the internal resistor 1b) of the dry battery 1 is equal to or higher than a predetermined value. The power switch 2 (indicated by Sw2)
Is turned on, and the terminal voltage _Vcc is applied to the control circuit 3. The IG output 6a is output from the drive circuit 6 to turn on the transistor 17, and a voltage is applied to the igniter (IG) 18 to start discharging. On the other hand, the driving circuit 8
The holding output 8a is output, the transistors 25 and 27 are turned on, and the holding winding 29a of the solenoid valve (SV) 29 is excited. However, the electromagnetic valve 29 remains closed because the suction force is weak. After a while (approximately 0.1 second) after the power is turned on, the SV suction output 7a from the drive circuit 7 is briefly output (0.3 seconds).
Second) and the transistors 21 and 22 are turned on.
A voltage is applied to the attraction winding 29b of the solenoid valve 29 to be excited. The resistance value of the attraction winding 29b is very small, about several ohms, and a large current of about several hundred mA flows through the attraction winding 29b to generate a large attraction, and the solenoid valve 29 is opened.
Even after the SV adsorption output 7a is stopped, the solenoid valve 29 is kept open by the SV holding output 8a of the holding winding 29a. Then, the combustion continues and the combustion detection signal of the thermocouple (not shown) continues to rise, and the IG output 6a is turned off when the ignition detection level is reached.

The terminal voltage V _cc during the above operation is controlled by the solenoid valve 2.
A large current of several hundred mA to the internal resistance 1b flows at SV adsorption output of 9, the voltage drop [Delta] V _a expressed by the product of the resistance value of the internal resistance 1b occurs in the current value.

FIG. 3 shows a method of setting a predetermined value Vs for monitoring the voltage Vcc between terminals of the dry battery 1 by the battery check means 9 and judging the usage limit of the dry battery 1. At an initial drive time t of about 0.3 seconds when the solenoid valve 29 opens the gas supply passage, the terminal voltage Vcc generates a start voltage drop ΔVa1. Initial drive t
In a stable period in which the subsequent SV suction output 7a is stopped and only the SV holding output 8a is output, the solenoid valve 29 is stably maintained in the open state, the steady-state voltage drop ΔVb1 of the terminal-to-terminal voltage Vcc becomes the starting voltage drop ΔVa1. Voltage drop ΔV for SV suction output 7a
= ΔVa1−ΔVb1. The state (a) in the figure is when the terminal-to-terminal voltage Vcc at the time of non-energization is the highest VT, and
Even if the suction output 7a is present, the terminal voltage Vcc1 is maintained at a predetermined value Vs.
taller than. The state (b) of FIG.
cc2 has dropped to the predetermined value Vs. In this state, the voltage drops ΔVa2 and ΔVb2 are smaller than the voltage drops ΔVa1 and ΔVb1 as the current to both windings 29a and 29b is reduced due to the decrease in the terminal voltage Vcc2. This decrease in current reduces the exciting force of both windings 29a and 29b. When the solenoid valve 29 is at the terminal voltage Vcc3,
It is the limit of the generation of the attractive force with good probability. At this time,
The coercive force is still sufficient, and the limit value of the inter-terminal voltage Vcc is still smaller.

The terminal voltage Vcc3, which is the limit of the attraction force,
Is obtained as a value that can drive the solenoid valve 29 with high probability. Further, in the igniter 18 as another control means of this device, the terminal voltage Vcc as an input voltage capable of igniting with high probability by setting various conditions such as low-temperature characteristics is lower than the terminal voltage Vcc2. . The solenoid valve 29 and the igniter 18 are components which are affected by the driving probability by the terminal voltage Vcc in the present apparatus. Therefore, the terminal voltage Vcc2 is set as a predetermined value of the control circuit 3. As described above, the predetermined value can be detected when the control means is not energized, that is, in a short time immediately after the operation instruction. In this device, the terminal voltage monitoring period t0 of the battery check means 9 is short (immediately after the operation instruction). It is set to 0.1 seconds). The consumption of the dry battery 1 during operation is slight after one use, and is included in the safety factor when a predetermined value is set. In addition, consumption of valuable dry batteries due to battery check during operation is prevented. As described above, the predetermined value V for determining the usage limit of the dry battery
s is determined and the control circuit controls by monitoring the voltage between the terminals of the dry cell.
Comparing the control signal output to the control means with the predetermined value Vs,
Battery check that instructs the control circuit whether the appliance can be operated
It is intended to provide a burning appliance provided with the means.

The battery may be checked during operation for safety. At this time, for example, the terminal voltage V _cc4 is selected as the second predetermined value, and the terminal voltage monitoring period t ₀ is selected.
A predetermined value different from the above is set. When the battery check is set to the terminal voltage monitoring period t ₀ , for example, the second
There is a point superior to the case where the predetermined value is set as the only predetermined value and the battery check is performed in the stable period (after the drive initial period t). That is, in this latter example, although it is possible to avoid the detection of the terminal voltage V _cc of the initial driving t _0, can not detect the terminal voltage V _cc before entering the operation. The low terminal-to-terminal voltage _Vcc is detected after the start of the stable period. If the solenoid valve 29 performs an unstable operation (such as chattering due to insufficient suction force) in the initial driving period t, the ignition delay or the like may occur. There is a risk of explosion and ignition. In this embodiment, unstable and uncertain operations due to such a detection delay can be excluded. When the operation is stopped with the second predetermined value during operation continuation, the so-called post-ignition is performed similarly to other operation stoppages, and the discharge of the igniter 18 causes the solenoid valve 29 to be closed improperly for a certain period of time. Prevent base explosion and combustion.

Next, the operations of the battery check means 9 and the timer means 10 will be described as circuit operations. Now, when the battery check means 9 without the timer means 10 is operated to temporarily detects the starting voltage drop [Delta] V _r, battery check output 9a becomes "H", the transistor 12 is turned on the transistor 24 and 27 is turned off holding winding The line 29a is not excited, the overlap period with the excitation period of the attraction winding 29b is eliminated, and the solenoid valve 29 is closed to stop combustion. As described above, combustion may stop even though the capacity of the dry battery 1 is still sufficient. In order to prevent this operation, a timer means 10 is provided, and the battery check output is turned off while the voltage is applied to the attracting winding 29b having a small load impedance at the output 10a at the initial drive time t. 3 when ON the power switch 2, shows the operation when the terminal voltage V _cc of the battery 1 is already lower than the predetermined value V _s, the inter-terminal voltage monitoring period t ₀
When the battery check means 9 detects a drop in the inter-terminal voltage _Vcc , the control circuit 3 issues an operation stop instruction to stop all outputs to the solenoid valve 29 and the igniter 18. At this time, the battery check output 9a is continuously output thereafter, the output of the clock 4 is input to the AND circuit element 5, and the AND circuit element 5 outputs the LED output 5a to periodically turn on the transistor 14. -O
FF is performed, and the LED 15 flashes to notify that the battery 1 needs to be replaced due to exhaustion.

The present invention utilizes the above-mentioned control device,
It can be commonly used for gas appliances, oil heaters, and other heating appliances such as heaters and cooking utensils.

[0016]

As is apparent from the above description, in the combustion apparatus according to the present invention, in the first aspect of the present invention, the control circuit receives from the battery check means the voltage between the dry battery terminals at which the control means can operate with high probability. the limits used by the consumable accurately detected, on which can safely use the instrument with confidence even when battery exhaustion, the when operating instruction input by the input means instrument operation
Check the voltage between the battery terminals before entering the
Operation can be determined without intervention of uncertain operation.
You can expect safer driving.

[0017]

Furthermore all of the control means driving performance becomes uncertain by claim 2, between the battery terminal voltage, a predetermined required input voltage of the control unit requiring the highest battery terminal voltage by distinguishing the activation voltage drop and the steady voltage drop By setting the value, the burning appliance can be used more safely, and the battery can be used for a little longer.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram showing an embodiment of a combustion appliance of the present invention.

FIG. 2 is the same time chart

FIG. 3 is a diagram showing a voltage drop characteristic of the control means.

FIG. 4 is the same time chart

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dry battery 2 Power switch 3 Control circuit 9 Battery check means 10 Timer means 18 Igniter 29 Solenoid valve

Claims (2)

(57) [Claims] 1. A battery for power supply and input of an operation instruction of an appliance.
Force means and a control means for operating the instrument by input of a control signal.
Stage, a control circuit for controlling the control means, and a terminal of the dry cell
The voltage between the devices is monitored and compared with a predetermined value to determine whether the appliance can be operated.
Battery check means for instructing the control means;
The voltage monitoring period between terminals of
Timer means for instructing only during a predetermined period after the input instruction of the stage;
Combustion device with a. 2. A control circuit for setting a predetermined value as a permissible terminal voltage allowing use of a dry battery from a starting voltage drop value of a plurality of control means at an early stage of driving and a steady voltage drop value of a stable period after the initial driving. The combustion device according to claim 1, further comprising: