JPS6143087Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a safety device in a heating machine.

Hereinafter, the present invention will be explained in detail by taking a forced air supply/exhaust oil hot air heater (hereinafter referred to as a heater) as an example. Even if the heater is turned off as soon as the operation switch is turned on, it must be ignited once to prevent oil from pooling in the burner.Also, to prevent deflagration, a warm air thermometer is installed to prevent the burner from igniting immediately after the fire is extinguished. It must be ensured that combustion does not occur even if the operation switch is turned on again. In other words, in such a heater, it is inconvenient to directly control the solenoid valve that controls the supply of oil with the operation switch, and the solenoid valve is controlled by the correlation between the operation switch and the hot air thermostat.

An example of such a configuration will be explained using a circuit according to the present invention shown in the drawings. 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 connected in parallel with the convection motor FM. 2 is an ignition heater driven and controlled by triac TR ₂ , SV ₁ is the main solenoid valve that controls the supply of oil to the combustion chamber, SV ₂ is also an auxiliary solenoid valve, and SCR is this solenoid valve SV ₁ ,
Controls energization to SV ₂ . The series-connected diode D ₄ , resistors R ₇ , R ₈ , transistor Q ₁ , etc. are as above.
This controls the SCR gate. The power supply to _{the motor} BM, heater 2, solenoid valves SV ₁ and SV _2, etc. is controlled by relay switch RY _2-1 as shown in the figure.
(bottom center of the drawing). NR and C ₃ 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,
RY ₂ is a relay connected in parallel to the transistors Q ₄ and Q ₅ and driven by the transistor Q ₂₀ . 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. 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 the 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 triax 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 remains unchanged, so the other states do not change.

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, SOR 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.

With such a heater, if the SCR fails or the transistor _Q1 fires, 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 SV ₁ will remain open. As long as there is oil, it will continue to burn, which is extremely dangerous.

The present invention was developed to eliminate these drawbacks, and even if the SCR etc. is fired, 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. Resistors R ₇₂ , R ₇₃ and transistor Q ₁₇ connected to the main solenoid valve SV ₁ are
A circuit is configured to detect energization to SV ₁ independently of the other control units 3 and 5. Also, transistors Q ₁₈ and Q ₁₉ connected in parallel with transistor Q ₄ are
When short failure occurs in SCR, etc., transistors Q ₄ and Q ₅
This is a circuit that releases the self-holding of . The transistor _Q18 is controlled on and off by the output supplied via the diode _D20 or the output of the NOR gate _NO1 supplied via the diode _D21 . Also, transistor _Q19 is controlled by the collector output of newly added transistor _Q17 .
The operation of this circuit will be explained next. During combustion, solenoid valve SV ₁ is on, so the transistor
_Q17 will turn on, turning on transistor _Q19 . 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.

In this way, according to the present invention, even if the element that controls the opening and closing of the solenoid valve is short-circuited due to a failure, the power to the solenoid valve, etc. can be immediately cut off by switching the operation switch to the "off" side. Combustion can be stopped by closing the solenoid valve. Therefore, the inconveniences of the past are eliminated, and the system is extremely safe.

[Brief explanation of drawings]

The drawing 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,
_D20 , _D21 : Diode.

Claims (1)

[Scope of Claim for Utility Model Registration] A heating system in which a solenoid valve for fuel control is opened in connection with the operation instruction operation of a driving switch, and heating is performed by burning the fuel supplied through this solenoid valve. In the machine, a detection means for electrically detecting the operation of the solenoid valve, a detection means for electrically detecting the "off" instruction state of the operation switch, a detection output of the detection means, and a detection output of the detection means. A heating machine characterized by comprising: a safety means for detecting the simultaneous presence of the solenoid valve and cutting off energization to the solenoid valve.