JPS5993122A - combustion device - Google Patents

Abstract

PURPOSE:To make it possible to actuate a control circuit and an ignition heater by a single power source by connecting the ignition heater to the secondary side of a transformer. CONSTITUTION:A closed circuit is constituted by an AC source 18, a microswitch 20, and the primary side 7' of a power transformer 7. In the secondary side 7'', a closed circuit is constituted by the point (a), a switch 8 closed by a push button 5, an ignition heater 9 and the point b. A bridge circuit 11 is connected btween the points (a) and (b) and, the positive and negative are shown by points (c) and (d). An oxygen starvation circuit 15, an oxygen starvation sensor 14 and a solenoid 16 are provided between the points (c)-(d), and the solenoid 16 is operated by a signal from the oxygen starvation sensor 14. By this procedure, the control circuit and the ignition heater are operated by a single power source. Further, when the characteristic of the combustion gas is temporarily poor upon the ignition, the control circuit does not operate, and hence unnecessary control is not carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion apparatus equipped with an oxygen deficiency safety function.

Conventional Structures and Problems Generally, when a combustion apparatus, especially an indoor open type combustion apparatus, is used for a long time, the oxygen concentration of the indoor air decreases and becomes oxygen-deficient, and at the same time, the indoor air starts to be filled with carbon monoxide. Therefore, it is necessary to add to this combustion apparatus an oxygen deficiency safety function that detects the oxygen deficiency state or a change in the tm current value or carbon monoxide concentration in the combustion flame caused by the oxygen deficiency state and stops combustion. However, when this oxygen deficiency safety function is added to a wick-type combustion device, a considerable amount of electric power is used, so conventional dry batteries have been used as the power source for ignition, but for control purposes, they have not been used as a power source. Since the voltage is stepped down by a transformer and used in this way, it is expensive and the wiring is complicated.

OBJECTS OF THE INVENTION The present invention allows this to be easily performed using only an AC commercial power source.

Structure of the Invention In order to achieve this object, the present invention connects an ignition heater to the secondary side of the transformer.

DESCRIPTION OF THE EMBODIMENTS A reflection plate 2 in the external device shown in FIGS. 1 and 2 reflects the combustion heat burned by the combustion tube 3 to provide heating.

By rotating the knob 4, the lamp wick 6 in the combustion tube 3 is raised, and by pressing the button 6, the lamp wick θ is ignited. Note that 25 is a knob for stopping combustion.

Further, when the knob 4 attached to the tank 10 is turned to raise the lamp wick 6, the knob 4 is fixed by the ratchet 23 and the locking mechanism 24. Further, a cam 19 is provided coaxially with the knob 4, and when the lamp wick 6 rises, the microswitch 20 is closed to operate the control circuit 17 connected to the AC power cord 18. The combustion tube 3 includes an inner flame tube 12, an outer flame tube 12,
13, combustion is performed by obtaining combustion air A, and combustion gas B reaches an oxygen deficiency sensor 14 attached to the upper plate 21. Reference numeral 16 denotes a solenoid, which is actuated by a control circuit 17 in response to a signal from the oxygen deficiency sensor 14 to strike the pendulum 26 and release the locking mechanism 24. In addition, 26 is a pendulum of an earthquake-resistant automatic fire extinguishing system, and in the event of an earthquake, the locking mechanism 24 is unlocked, the lamp wick 6 is lowered, and combustion is stopped.

FIG. 3 is a control circuit diagram showing the AC power supply 18 and the microswitch 20. A closed circuit is formed with the primary side 7 of the power transformer 7. The secondary side 7'' of the power transformer 7 has 8 points,
Switch 8 closed by pushbutton 6 - Ignition heater e -
A closed circuit is formed with point b. A bridge circuit 11 is connected between points a and b, and its positive and negative points are defined as points c and d. There is an oxygen deficiency circuit 15 between C and dA, and there are an oxygen deficiency sensor 14 and a solenoid 16, and the solenoid 16 is operated by a signal from the oxygen deficiency sensor 14.

FIG. 4 shows the characteristics of the load resistance and terminal voltage of the power transformer 7.

The operation of the circuit shown in FIG. 3 will be explained. Assuming that alternating current is applied from the alternating current power source 18 and the microswitch 20 is closed, a voltage is also generated on the secondary side 7° of the power transformer 7.

When the pushbutton 8 is pressed now, a current flows through the ignition heater 9, but if the resistance of the ignition heater 9 is 2Ω, the secondary voltage of the power transformer 7 drops to 2V as shown in Fig. 4, and the current flows to 1
People flow. Then, ignite the wick 6 and push button 8
Since the hand is removed from the switch 8, the switch 8 is opened and the secondary voltage is applied to the circuit after the bridge diode 11. Assuming that this impedance is approximately 300 Ω, the secondary (l!I voltage of the power transformer 7 is 12 V, so the current is 4 Ω
A flow, the oxygen deficient circuit 15 starts operating. By using a transformer that has large fluctuations depending on the load (poor legion), the secondary side of the power transformer 7 is used for two purposes.Not only does it eliminate the need for dry batteries, but it also requires only an AC power supply. Can be used anywhere.

Effects of the Invention In the present invention, a control circuit and a power source for ignition peak can be obtained in one, and the control circuit is not activated when combustion gas characteristics are temporarily bad, such as during ignition, and unnecessary control is not performed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an oil tank according to an embodiment of the present invention, and FIG. 2 is a sectional view thereof. FIG. 3 is a circuit diagram of the same, and FIG. 4 is a characteristic diagram of the power transformer. 7...Power transformer, 8...Push button switch, 9...Ignition heater, 14...
...Oxygen deficiency sensor, 15...Control circuit, 16...
···solenoid. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Scope of Claims] The present invention includes a sensor for detecting oxygen deficiency and a control circuit for operating an alarm means or a combustion stop means based on the output of the sensor, and the control circuit is coupled to the secondary side of a power transformer, A combustion device that connects an ignition heater to the secondary side of the power transformer during ignition.