JPS6119329Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a combustion control device for, for example, a kerosene stove that performs a combustion operation using indoor oxygen.

For example, if you use a kerosene stove equipped with a timer, you can set the timer before going to bed to start the combustion process several hours before you wake up, so that the room will be warm when you wake up. By the way, with kerosene stoves that are used in this way and use indoor oxygen to perform the combustion operation, there is a risk that the room will become depleted of oxygen while you sleep, so you should set a timer to perform the combustion operation. In such cases, the fire will be automatically extinguished after a sufficient amount of time has passed to avoid oxygen deficiency. In addition, in such a kerosene stove, when the timer is set to a non-setting state, it becomes continuous operation, and the combustion operation continues continuously.

Conventionally, this type of kerosene stove has had the disadvantage that if the timer is set and the combustion operation is switched to continuous operation, the combustion operation will be temporarily extinguished.

This idea was devised to eliminate these drawbacks, and even if the timer is set and the combustion operation is in progress, the combustion operation continues as it is even if the combustion operation is switched to continuous operation, resulting in good combustion control. The purpose is to provide a combustion control device that can

Hereinafter, embodiments of this invention will be described with reference to the drawings.

In Figure 1, P is a power plug, one terminal of this plug P is connected to the line N via a current fuse _F1 , and the other terminal is connected to a temperature fuse.
F ₂ and an overheating prevention thermostat T are connected to the line R in series. A reset relay RL ₂ is connected between the lines R and N through a contact point of a switching type main switch SW ₁ and a contact point SW ₃ of an anti-seismic automatic fire extinguishing system in series. The normally open contact _R2 of the reset relay _RL2 is connected in parallel to the a contact of the main switch _SW1 , and the abnormal high voltage protection varistor TNR is connected in parallel to the series circuit of the a contact and the reset relay _RL2 . are doing. The line L is connected to the line R through the normally open contact _r2 of the reset relay _RL2 and the b contact of the main switch _SW1 in series. A carburetor heater H is connected between the lines L and N via a bidirectional three-terminal thyristor TAC. In addition, a high voltage discharge transformer TR having an internal timer circuit is connected between the lines L and N through a normally open contact _r1 of a first control relay _RL1 , which will be described later, and a pump motor PM for supplying fuel is connected. Connected. One of the output parts of the transformer TR is connected to the discharge plug IG, and the other is connected to the earth point E. Further, a convection blower is connected between the lines L and N via a normally open contact r ₁ of the first control relay RL ₁ , an air volume switching switch SW ₂ , and a switching contact r ₃ of a second control relay RL ₃ , which will be described later. motor
FM is connected. i.e. the blower motor
The FM has a common terminal on one side and a strong wind terminal and a weak wind terminal on the other, the common terminal is connected to the line L via the normally open contact _R1 , and the strong wind terminal is connected to the b contact of the switch _SW2 . The a contact point of the switching contact _r3 is connected in series to the line N, and the switching contact _r3 is also connected to the line N via the b contact point. Further, the weak wind terminal of the blower motor FM is connected to the line N through the a contact point of the switch _SW2 and the a contact point of the switching contact _r3 in series. Further, a timer motor TM is connected between the lines L and N via the b contact of the first switching type timer contact Ts ₁ , and the a of the first timer contact Ts ₁ is connected between the lines L and N.
A parallel circuit of a series circuit of the contact and the a contact of the second switching type timer contact _Ts2 , and a series circuit of the b contact of the first timer contact _Ts2 and the b contact of the _second timer contact Ts2. The combustion control circuit EC is connected via. A timer lamp _P2 is connected in parallel to the timer motor TM. The input section of the combustion control circuit EC includes a thermistor TH for detecting the temperature of the carburetor,
A frame rod F and a water detection sensor Ws are connected, and the output section has first and second control relays RL ₁ ,
RL ₃ , operation lamp P ₁ , and water detection lamp P ₃ are connected. A positive temperature coefficient thermistor PTH is connected in parallel to the contact of the second timer contact _Ts2 . When the combustion control circuit EC starts energizing, it lights up the operation lamp _P1 and turns on the thyristor.
I am trying to energize TAC. When the thermistor TH detects that the vaporizer has reached the set temperature, the first and second control relays RL ₁ ,
The thyristor TAC is deenergized while energizing RL ₂ . It also operates an internal timer circuit to start detecting the flame current at the flame rod F after the required time (about a few seconds), and de-energizes the first control relay RL ₁ when no flame current is detected. I have to. Furthermore, another timer circuit provided inside is operated and the second timer circuit is activated after the required time.
The control relay RL ₃ is controlled to be de-energized. The second control relay RL ₃ closes the a contact of the switching contact r ₃ when deenergized, and closes the b contact when energized. As shown in FIG. 2, the timer motor TM is attached to an operating knob A for setting each position of continuous, off, on, and time of up to 12 hours. The relationship with the second timer contacts Ts ₁ and Ts ₂ is the third
It is as shown in the figure. In other words, when the operation knob A is set to the continuous position, the timer is not set, and the first and second timer contacts Ts ₁ ,
Ts ₂ is designed to close each a contact. When set to the off position, the first timer contact Ts ₁ is the a contact, and the second timer contact Ts ₂ is the b contact.
Each contact is closed. Further, when set to the on position, the first and second timer contacts Ts ₁ and Ts ₂ close their respective b contacts. Further on position (this is the timer time 0
(equivalent to 12 hours), the first timer contact Ts ₁ closes the B contact, and the second timer contact Ts ₂ closes the A contact. Note that the timer contact _Ts1 is operated by quick switching from the B contact to the A contact. When the timer motor TQM is energized, it rotates the operating knob A through the positions 12, 11, .

Next, the operation of the apparatus according to the embodiment of the present invention constructed as described above will be described based on the time chart shown in FIG.

First, let us discuss the case of continuous operation. In this case, operating knob A is set to the continuous position. When the power plug P is inserted into the commercial AC power source at the time shown in Fig. 4, power is started to be applied to the reset relay RL ₂ via the a contact of the main switch SW ₁ , and the normally open contact r ₂ of that relay is closed. . Thereafter, reset relay RL ₂ is self-maintained. When the main switch SW ₁ is switched and the b contact is closed at the time shown in Fig. 4, the normally open contact r ₂ , the b contact of the main switch SW ₁ , and the first and second timer contacts Ts ₁ and Ts ₂ are opened. a
Power to the combustion control circuit EC is started via the contact, the operation lamp _P1 lights up, and the thyristor is turned on.
TAC is energized and energization to carburetor heater H is started. At this point, the air volume selector switch SW ₂
Set to the b contact side. In this way, the vaporizer is heated by the heater H. When the vaporizer temperature reaches the set temperature sufficient for ignition at the time shown in Fig. 4, the first and second control relays RL ₁ and RL ₃ are energized by the resistance value change of the thermistor TH, and the normally open contact r ₁ is closed, and at the same time, the b contact of switching contact _r3 is closed. Also, thyristor TAC is controlled to be non-conductive.
In this way, power supply to the heater H is stopped, and power supply to the pump motor PH, high voltage discharge transformer TR, and blower motor FM is started. Thereafter, the heater H is energized by the thyristor TAC based on the temperature detection of the thermistor TH.
The blower motor FM is forced to operate with strong wind when the b contact of switching contact _r3 is closed. one hand pump motor
Fuel is pressurized into the carburetor by the PM, and the discharge plug IG starts discharging. In this manner, the fuel is vaporized in the vaporizer, injected from the nozzle into the burner, and ignited by discharge from the discharge plug IG. After several seconds have elapsed, the combustion control circuit EC detects whether or not the burner has been ignited by the flame rod. When a misfire is detected, the first control relay RL ₁ is deenergized to immediately perform a fire extinguishing operation. Further, when ignition is detected, the combustion operation is continued. In addition, when the required time has elapsed from the start of the ignition operation and the time shown in Fig. 4 is reached, the discharge transformer TR
stops the discharging operation when the timer circuit times up, and the combustion control circuit EC deenergizes the second control relay RL ₃ when the timer circuit times up. In this way, the switching contact _r3 is switched from the B contact side to the A contact side, and the blower motor FM is operated with strong wind according to the setting of the air volume changeover switch _SW2 . In this way, the blower motor FM is forced into strong wind operation at the time of ignition to ensure a sufficient supply of oxygen to the burner and to ensure motor startup. Then, at the point in Figure 4, the air volume selector switch is turned on.
When SW ₂ is switched to the a contact side, the blower motor FM is operated with low wind. Furthermore, when main switch SW ₁ is switched from the B contact side to the A contact side at the point in FIG. 4, the power to the combustion control circuit C, pump motor PM, and blower motor FM is cut off, and the first control relay RL ₁ The power is turned off, the operation lamp _P1 goes out, and the fire is extinguished. Next, let's talk about the case of operation using a timer. In this case, at the point in Figure 4, set the operation knob A to the desired time and turn the main switch.
Set SW ₁ to the b contact side. As a result, the first timer contact _Ts1 is set to the b contact side, so
When the timer motor TM starts to be energized, the timer lamp _P2 lights up. On the other hand, since the second timer contact _Ts2 is set to the a contact side, the energization to the combustion control circuit EC is stopped. In this state, when the set time has elapsed and the time point shown in Figure 4 is reached, the operating knob A turns to the on position, and the second timer contact
Ts ₂ switches to B contact side. This starts energizing the combustion control circuit EC. In this way, the thyristor TAC is controlled to be conductive as in the case of continuous operation described above, and energization to the heater H is started, and at the same time, the operation lamp _P1 is turned on. Subsequently, at the time point shown in FIG. 4, the thermistor TH detects that the temperature of the vaporizer has risen to the set temperature, and the first and second control relays RL ₁ and RL ₂ are energized. In this way, the pump motor PM operates to start supplying fuel to the carburetor, and at the same time, the blower motor FM is operated with strong wind. Also discharge plug IG
is discharged and ignition of the burner begins. When the burner is properly ignited in this way, the combustion operation is started. Then, at the point in time shown in FIG. 4 after the required time has elapsed, the second control relay RL ₃ is deenergized and the discharge of the discharge plug IG is stopped. In this state, after the set time to prevent oxygen deficiency, that is, one hour after the operation knob A reaches the on position, the fourth
At the time shown in the figure, the operating knob A is rotated to the off position and the first timer contact _Ts1 is switched to the a contact side. In this way, power supply to the timer motor TM is stopped. In addition, by switching the first timer contact Ts ₁ , the combustion control circuit EC is energized by the positive temperature coefficient thermistor.
This is done via PTH, and the positive temperature coefficient thermistor PTH self-heats. As a result, the resistance value of the positive temperature coefficient thermistor PTH increases rapidly, the voltage supplied to the combustion control circuit EC rapidly decreases, and eventually the operation of the combustion control circuit EC stops and the fire is extinguished. In this way, when the timer is used, the fire is automatically extinguished after one hour of operation to prevent oxygen deficiency.

Incidentally, there are cases where the combustion operation is switched to continuous operation while the combustion operation is being performed by timer operation.
For example, you may set the timer the previous day, wake up the next morning during combustion, and switch from timer operation to continuous operation. In this case, you will need to energize operating knob A to the off position and turn it to the continuous position. By this rotation of operation knob A, the first and second timer contacts Ts ₁ and Ts change from both B contacts closed to Ts ₁ 's A contact closed (off position), and then both A contacts closed (continuous). position), and in the middle both timer contacts Ts ₁ ,
There is a period in which the combustion control circuit EC is not energized via Ts ₂ (energization period in the off position), but
At this time, since the combustion control circuit EC continues to be energized via the positive temperature coefficient thermistor PTH, the operation of the combustion control circuit EC continues without interruption. Therefore, even if the operating knob A is continuously switched during timer operation, the combustion will not be extinguished, and the continuous operation will smoothly proceed, allowing good combustion control.

In this embodiment, when there is a power outage, reset relay RL ₂ is deenergized and its normally open contact _r2 is opened, and when an earthquake occurs, contact SW ₃ is opened and reset relay RL ₂ is deenergized. Therefore, in such a case, the power to the combustion control circuit EC is immediately cut off and the fire is extinguished. From then on, the normally open contact _r2 of the reset relay _RL2 remains open, so unless the main switch _SW1 is returned to the a contact side, there will be no restart, and safety can be guaranteed.

As detailed above, according to the present invention, even if the timer contact is temporarily disconnected when switching to continuous operation during combustion operation by the timer, electricity is maintained to the combustion control circuit via the positive temperature coefficient thermistor during that time. Therefore, even when switching from combustion operation using a timer to continuous operation, there is no inconvenience that the combustion operation is temporarily stopped, and the combustion operation can continue smoothly, making it possible to provide a combustion control device that can perform good combustion control. It is something.

[Brief explanation of the drawing]

The figures show an embodiment of this invention, in which Fig. 1 is a control circuit diagram, Fig. 2 is a diagram showing the operation knob of the timer, and Fig. 3 is a timing diagram showing the position of the operation knob and the operation of the timer contact. FIG. 4 is a time chart showing the operation timing of each part in the combustion operation along the flow of time. SW ₁ ...Main switch, PM...Pump motor, TM...Timer motor, Ts ₁ , Ts ₂ ...Timer contact, RL ₁ , RL ₃ ...Control relay, EC...Combustion control circuit, PTH...Positive Characteristic thermistor.

Claims (1)

[Scope of utility model registration request] The first and second switching type timer contacts, when the timer time is not set, one of the two timer contacts is closed, and when the timer time is set, the first timer contact is switched and the other contact is closed. When the timer is closed, the other contact is energized, and when the timer time has elapsed, the second timer contact is switched to close the other contact, and after that, the state is maintained for the required time, and then the first timer is turned on. A timer that performs control to return the contact to one contact side, and a series circuit of one contact of the first and second timer contacts or a series circuit of the other contact, and energization is applied to start combustion in the combustion section. A combustion control device comprising: a combustion control circuit that stops combustion in the combustion section when the current is turned off; and a positive temperature coefficient thermistor connected in parallel to one of the second timer contacts. .