JPS6242276Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to improvements in ignition and extinguishing means for pot-type oil heaters.

<Prior art> Conventional pot-type oil heaters supply oil into a pot, where it is combusted, and this combustion heat is used for heating, but as soon as the operation switch is turned on, the Even if the burner is turned off, it must be ignited once to prevent oil from pooling in the burner, and
In order to prevent deflagration, a warm air thermostat must be installed to ensure that combustion does not occur even if the operation switch is turned on again immediately after extinguishing the fire, which is troublesome in terms of usability.

<Details of an example of the prior art> Fig. 1 shows an example in which such a pot type kerosene heater (hereinafter referred to as a heater) is made into a forced air supply/exhaust hot air heater. The FM at the top left of the drawing is a convection motor that drives a fan to blow out hot air, and its drive is controlled by relay switch RY _3-1 , which is controlled by relay RY ₃ (bottom right of the drawing). 1 connected in series to this motor FM is a hot air thermostat that detects the temperature of the combustion section in order to prevent deflagration and the like. Note that this thermostat 1 is turned on when the temperature exceeds a predetermined temperature, such as during combustion. BM is a combustion motor that drives a fan that blows air into the combustion chamber, and is similar to the convection motor mentioned above.
Connected in parallel with FM. 2 is triack
The ignition heater is driven and controlled by TR ₂ , SV ₁ is the main solenoid valve that controls the supply of oil to the combustion chamber, SV ₂ is the auxiliary solenoid valve, and SCR is the solenoid valve SV ₁ , SV ₂
Controls energization to. diodes connected in series
D ₄ , resistors R ₇ , R ₈ , transistor Q ₁ , etc. are the above SCR
It controls the gate of Above motor
The power supply to BM, heater 2, solenoid valves SV ₁ and SV _2, etc. is controlled by relay switch RY _2-1 as shown in the figure, but relay switch RY _2-1 is connected to relay RY ₂ .
(bottom center of the drawing). NR and _C3 are provided for surge and noise absorption.

The above-mentioned motors FM, BM, heater 2, valve SV ₁ ,
SV ₂ and the like are the main components of the heater, and by driving them in a predetermined order, ignition, combustion, heating, extinguishing, etc. can be performed. 3 is a control unit provided to control the drive timing of the ignition heater 2, the main solenoid valve SV ₁ and the auxiliary solenoid valve SV ₂ , which includes a transistor Q ₇ for power supply control, and a room thermostat for controlling the room temperature.
A group of logic gates is provided to detect whether the RT or operation switch 4 is turned on or off. This _{gate group consists of a flip-flop consisting of NOR gates NO 1 and NO 2, AND gates AG 1 and AG 2 , and NOR gates NO 3 and NO 4 .} Control on/off.

5 is the supply of power to each part, the above relay RY ₁ ,
A power supply control unit controls the drive of the RY ₂ , etc., and 6 is a 2-circuit, 2-contact operation switch that has "on" and "off" positions and is interlocked with the above-mentioned operation switch 4.
Q ₄ and Q ₅ are self-holding transistors for power supply,
_RY2 is a relay connected in parallel to the transistors _Q4 and _Q5 and driven by the transistor _Q20 . RY ₁ and RY ₃ are each relays connected to the power supply side via relay switches RY _1-1 (controlled by relay RY ₁ ).
The relay RY ₃ drives a relay switch RY _3-2 that controls energization of the auxiliary solenoid valve SV ₂ , and is controlled by a transistor Q ₁₆ . 7 and 8 are switches for anti-shock and overheat prevention, respectively. Reference numeral 9 denotes a reset switch connected to the "off" contact of the operation switch 6, and when the switch 9 is turned on, power is temporarily supplied to the control section 4. Note 10
1 is a power outage lamp, 11 is an operation lamp, and 12 is an abnormality lamp.

Here, the operation of the control section 5 will be briefly explained. When the operation switch 6 is in the "off" state and the reset switch 9 is off, the transistor
Since both _Q4 and _Q5 are off, power is not supplied after _Q5 . In this state, when the reset switch 9 is turned on, power is supplied if the warm air thermostat 1 is off, and no power is supplied if it is on. i.e. transistor
Q ₂ and Q ₃ are provided to detect whether the hot air thermostat 1 is on or off, and when the thermostat 1 is off, transistors Q ₂ and Q ₃ are both off and the thermostat 1 is on. In this case, both Q ₂ and Q ₃ are turned on. Therefore, when the reset switch 9 is turned on and the thermostat 1 is off, a high level power source flows through the reset switch 9 and the resistors R ₁₃ , R ₁₈ , R ₁₉ and turns on the transistor Q ₄ . _Q5 is turned on and power is continuously supplied from then on. Conversely, when thermostat 1 is on, transistors Q ₂ and Q ₃ are turned on and the collector of transistor Q ₃ becomes low level, so transistor Q ₄ is not turned on and transistor Q ₅ remains off, supplying power. will be prevented.

When thermometer 1 is off, power is supplied directly to relay RY ₁ via resistor R ₁₀₃ , so relay RY ₁ is activated and relay switch RY _1-1 is switched to the No contact side. The state will be maintained from now on. The above power supply is supplied to the logic gate group through the transistor _Q7 of the control section 5 to reset the flip-flop. Therefore Noah Gate
The output of NO ₂ becomes "L", turning off transistor Q ₁₂ and turning off transistor Q ₂₀ via diode D ₁₅ and resistor R ₇₁ . Also, since the output of AND gate AG ₂ is “L”, the transistor
Q ₁₁ is also off. Therefore, the transistor
Both Q ₁₁ and Q ₁₂ are off, turning off the transistor Q ₁ and the triax TR ₂ and maintaining the extinguished state.

When the operating switches 4 and 6 are switched to the "operating" side, the output of the switch 4 becomes H, setting the flip-flop, that is, setting the output of the NOR gate _NO2 to H. Therefore, transistor Q ₂₀ turns on, drives relay RY ₂ , switches relay switch RY _2-1 to contact No side, turns on transistor Q ₁₂ , turns on transistor Q ₁ , turns on SCR, and switches main solenoid valve SV. Open ₁ . At this time, and gate
The transistor _Q11 is turned on by the output of _AG2 , and the triax _TR2 is turned on, so that the ignition heater 2 is also energized. That is, at the same time as the combustion motor BM rotates, the ignition heater 2 is activated, and the main solenoid valve SV ₁ is further opened to start the ignition operation. The room thermometer RT in the control unit 3 adjusts the room temperature, and if the indoor air is lower than the set temperature, the output RTP is
If it is high to H level, it becomes L level. This output RTP controls AND gate AG ₃ to control the drive of relay RY ₃ , but at the initial stage of ignition, transistor Q ₁₅ is on, so RTP
is always clamped to L level. Therefore, at the initial stage of ignition, relay RY ₃ does not operate and auxiliary solenoid valve SV ₂ does not open. However, when combustion continues and hot air thermostat 1 is turned on, transistors Q ₂ and Q ₃
is turned on, and as a result, transistor _Q15 is turned off, so that from then on the output RTP changes in accordance with the room air and controls the opening and closing of the auxiliary solenoid valve _SV2 . The room temperature is controlled by opening and closing this auxiliary solenoid valve _SV2 . Also, when transistor Q ₂ is turned on, transistor Q ₁₀ is turned on via resistor R ₃₀ , so the gate
The inputs of AG ₁ , AG ₂ , and NO ₃ each become L, and transistor Q ₁₁ is turned off. Therefore, the triac TR ₂ is turned off and the energization to the ignition heater 2 is stopped. Since solenoid valve SV ₁ is open, combustion continues. On the other hand, the outputs of the gates AG ₁ and NO ₃ both change to L, but the output of the flip-flop does not change, so the other states do not change. In addition, thermo 19
Before turning on, turn off operation switches 4 and 6.
Even when switching to the side, the output of the AND gate _AG1 becomes L and the output of the NOR gate becomes L because the transistor _Q10 is off, so the flip-flop state remains unchanged and the combustion operation continues. Therefore, if the operating switches 4 and 6 are accidentally switched to the "operating" side, even if they are immediately returned to the "off" side, ignition will occur.

In this way, combustion continues, and the room temperature remains at room temperature.
Adjusted appropriately by RT. When extinguishing a fire,
Switch the operation switch 4 to the "off" side. Due to this switching, the output of the NOR gate _NO3 becomes H and resets the flip-flop, so that the transistor _Q12 is turned off, _Q1 is turned off, SCR is turned off, and the main solenoid valve _SV1 is closed. Transistor Q ₁₆ at the same time
is always turned off, so auxiliary solenoid valve SV ₂ is also closed. Therefore, combustion stops and the fire is extinguished. but,
Since the hot air thermostat 1 continues to be on while the combustion section is hot, the transistor _Q20 continues to be on due to the power supplied through the diode _D14 . Therefore, relay RY ₂ continues to drive and the combustion motor
BM and convection motor FM continue to rotate. This rotation stops when thermometer 1 is turned off and relay RY ₂ stops driving.

Note that even if the operation switches 4 and 6 are switched to the operation side while the hot air thermometer 1 is working, the voltage on the collector side of the transistor _Q2 will cause the transistor to turn off.
Since _Q10 is on, the set output of the flip-flop and the output of gate _AG2 both remain at L, and no ignition occurs. This prevents deflagration.

However, with such a configuration, if the SCR has a firing failure or the transistor _Q1 has fired, even if you try to put out the fire by switching the operation switches 4 and 6 to the "off" side, at least the solenoid valve will not work.
SV ₁ will remain open and continue to burn as long as there is oil, which is very dangerous, so the SCR
Even if something happens, the power to the solenoid valve and combustion motor can be stopped by turning off the operation switch. This point will be explained below with reference to the drawings. Resistor R ₇₂ connected to the main solenoid valve SV ₁ ,
R ₇₃ and transistor Q ₁₇ constitute a circuit that detects energization of the valve SV ₁ independently of the other control units 3 and 5.

Further, transistors Q ₁₈ and Q ₁₉ connected in parallel with transistor _Q 4 are a circuit that releases the self-holding of transistors Q ₄ and Q ₅ when a short failure occurs in an SCR or the like. The transistor _Q18 above is a diode
Output or diode supplied via D ₂₀
It is controlled on and off by the output of NOR gate NO ₁ supplied via D ₂₁ . Also transistor
_Q19 is controlled by the collector output of the transistor _Q17 . The operation of this circuit will be explained next. During combustion, solenoid valve SV ₁ is on, so transistor Q ₁₇ is on, and transistor
_Q19 will be turned on. On the other hand, since the transistor Q ₁₈ is turned off by the "L" output of the NOR gate NO ₁ , the potential between the resistors R ₁₇ and R ₁₈ is almost the same as when the transistors Q ₁₈ and Q ₁₉ are not connected, and the operation is possible. There will be no inconvenience at all.

However, when the operation switches 4 and 6 are turned off to extinguish the fire while the SCR is shot or the transistor _Q1 is shot during combustion, the reset output of the flip-flop, that is, the output of the NOR gate _NO1 becomes H, and the transistor _Q17 remains on, transistors Q ₁₈ and Q ₁₉ are both turned on, lowering the potential at the connection point between resistors R ₁₇ and R ₁₈ to about 0.6V. Therefore, the transistor _Q4 is turned off, the self-holding of the transistor _Q5 is released, and the relay _RY2 is turned off. Therefore, energization to the solenoid valves SV ₁ , SV ₂ , motor BM, etc. is forcibly stopped, and the fire is extinguished. At this time, the power outage lamp 10 lights up at the same time. In addition, if the anti-shock switch 7 or the overheat prevention switch 8 is activated, the relay will be activated.
RY ₁ stops operating and relay switch RY _1-1 becomes Nc.
Since the transistor Q 18 is switched to the side, the transistor Q ₁₈ is turned on via the diode D ₂₀ , and in the same manner as described above, the self-holding of the transistors Q ₄ and Q ₅ is released and the power supply is stopped.

<Problems to be solved> In the case of a heater with a circuit like the one described above, as mentioned above, if you accidentally switch the operating switches 4 and 6 to the operating side and immediately return them to the "off" side, the heater will always ignite once. It is very inconvenient because it is stored away, and electricity and kerosene are used up without any fuss.

Therefore, the problem of this invention is to create a function that allows pot-type kerosene heaters to maintain the extinguished state without igniting, as in the past, by switching the operation switch to the operating side and immediately returning it to the "off" side. The purpose is to establish.

<Means for solving the problem> Combustion control that energizes the ignition heater and combustion motor in response to an operation instruction signal from the operation switch, and stops the energization in response to an extinguishing instruction signal from the operation switch. means for measuring a certain period of time until the ignition heater becomes red hot in response to the operation instruction signal, and is reset by the extinguishing instruction signal; AND gate means that is turned on by AND logic with the output after time measurement, and valve control means that opens the fuel control electromagnetic valve based on the output of the AND gate means.

<Operation> When the operation switch is switched to the operation side, the ignition heater and combustion motor are energized and start operating. However, the fuel control solenoid valve does not turn on immediately. The AND gate means is turned on based on the output after the time measuring means has counted a certain period of time.

Therefore, even if the operating switch is switched to the operating side, if it is returned to the "off" side before the AND gate means is turned on, ignition will not occur.

Also, if you return it to the "off" side during combustion,
Since the operation instruction signal disappears, the AND gate means is immediately turned off, and the fuel control solenoid valve is also immediately closed. Therefore, the fire can be extinguished quickly and safety is improved.

<Embodiment> The present invention has been made in order to improve such drawbacks. The present invention will be explained below with reference to FIG. That is, the present invention is based on the control section 3 in FIG.
The configuration is as shown in FIG. 2, and is completely the same as that in FIG. 1 except for this control portion. A particular difference in FIG. 2 is that the output of the NOR gate NO ₂ is not directly supplied to the transistor Q ₁₂ and the NOR gate NO ₄ , but instead is connected to diodes D ₃₁ , D ₃₂ , resistor R ₄₇ ,
R ₄₈ , R ₄₉ , capacitor C ₂₂ and AND gate AG ₄
This means that the clock is supplied through a clock means consisting of: In this way, you can switch the operation switch 4 to the operation side and set the output of Noah Gate NO ₂ to H.
When this happens, charging of capacitor C ₂₂ only begins via diode D ₃₁ and resistor R ₄₇ , but transistor Q ₁₂ does not turn on. At this time, try
Since TR ₂ is turned on when the transistor Q ₁₁ is turned on and energization to the ignition heater 2 has started, the energization to the solenoid valve SV ₁ is substantially delayed from the energization to the ignition heater 2. When the charging voltage of capacitor C ₂₂ reaches the specified voltage (H level), an AND gate is activated.
AG ₄ turns on, turning on transistor Q ₁₂ . By turning on this transistor _Q12 , the transistor
Since Q ₁ and SCR are turned on, solenoid valve SV ₁ opens here. If the values of capacitor C ₂₂ and resistor R ₄₇ are determined so that this delay time is almost the same as the time it takes for ignition heater 2 to become red hot (approximately 30 seconds after being energized), opening of solenoid valve SV ₁ can be done. The oil supplied at is instantaneously ignited by the heater 2.

If the operation switch 4 is set to ``Run'' and the output of NO <sub>2</sub> is set to ``H'', and the operation switch is returned to ``OFF'' before the output of AG <sub>4</sub> becomes ``H'', the output of AG ₁ becomes ``H''. Since it becomes "L" and the output of AG ₄ is also "L"
The output of NO ₄ becomes "H" and enters the reset input of the flip-flop through diode D13. Therefore, the output of NO ₂ is reversed to "L", and the ignition heater 2,
Combustion motor BM turns OFF and stops. During this time,
The ignition heater 2 is not yet red hot and no oil is coming out, so it is safe to stop it immediately.

Meanwhile, after the charging time of capacitor C ₂₂ AG ₄
After the output becomes “H”, the hot air thermometer 1 is still
If the operation switch 4 is turned off while the oil is off, the ignition must be started at some point to prevent oil from pooling. Since the output of AG ₄ is "H", even if the output of AG ₁ becomes "L", the output of NO ₄ is "L",
The output of NO ₂ is "H", that is, the ignition mode continues.
And when hot air thermometer 1 turns on, the transistor
Since Q10 becomes NO and the NO ₃ output becomes "H", a reset input is input through diode D12, which inverts the output of NO ₂ to "L", and the output of DG ₂ also becomes "L", and the ignition heater and The solenoid valve turns OFF. On the other hand, since relay RY ₂ is ON through diode D ₁₄ , combustion motor BM continues to rotate and enters extinguishing mode. Then, when hot air thermo 1 turns off, relay RY ₂ turns off.
In FIG. 2, diode _D33 and resistor _R50 feed back the output of _AG4 to prevent chattering.

<Effects> As described above, according to the present invention, even if the operation switch is once turned to the operation side in a pot-type kerosene heater, if the operation switch is immediately returned to the "off" side, the operation can be immediately stopped. The ease of use is significantly improved compared to a system that shuts down once it is in the ignition state.

Furthermore, if a command to stop operation is given during combustion, the fuel supply is immediately stopped, which improves safety.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the heater, and FIG. 2 is a circuit diagram of the main parts of the heater of the present invention. Code, BM: Combustion motor, SV ₁ : Main solenoid valve,
SV ₂ : Auxiliary solenoid valve, Q ₁ , Q ₂ : Transistor,
D ₃₁ , D ₃₂ : Diode, C ₂₂ : Capacitor,
AG ₄ : And Gate.

Claims (1)

[Scope of Claim for Utility Model Registration] In a pot-type kerosene heater that performs operations such as combustion and extinguishing by controlling the energization of the combustion motor, fuel supply means, ignition heater, etc. by a control unit supplied with power. , the control unit includes a combustion control means that energizes the ignition heater and the combustion motor in response to an operation instruction signal from the operation switch, and stops the energization in response to an extinguishing instruction signal from the operation switch; a timer that measures a certain period of time until the ignition heater becomes red hot in response to the operation instruction signal, and is reset by the extinguishing instruction signal; and an output of the operation instruction signal and the timing means after the specified period of time has been measured. A kerosene heater comprising: AND gate means that is turned on by AND logic; and valve control means that opens a fuel control solenoid valve based on the output of the AND gate means.