JPH045878Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a combustion control circuit for a liquid combustor, which includes a heat exchanger for external loads in addition to a heat exchanger exclusively for heating.

(Prior Art) This device includes a heater equipped with a liquid fuel combustion burner, a heat exchanger exclusively for heating, and a heat exchanger for a floor heater and other external loads, and an electromagnetic pump is used as the fuel supply means. It is known to provide a drive control circuit for the electromagnetic pump in which two capacity setting circuits for setting the discharge capacity of the electromagnetic pump are selectively connected via a temperature control switch.

(Problem that the invention attempts to solve) However, when using a heat exchanger for external load,
This removes heat and reduces the amount of heat emitted from the radiator, resulting in disadvantages such as a long time required for the room temperature to rise to a constant temperature.

An object of the present invention is to obtain a combustion control circuit for a liquid combustor that does not have such disadvantages.

(Means for Solving the Problem) In order to achieve the above object, the present invention includes a liquid fuel combustion burner, an electromagnetic pump that supplies fuel to the burner, a radiator, a floor heater, and other external loads. and a heat exchanger, the drive control circuit of the electromagnetic pump is provided with two capacity setting circuits each including a resistor for setting the discharge capacity of the electromagnetic pump,
In the case of selective intervention via a changeover switch, both capacity setting circuits are coupled in parallel to the drive control circuit via a circuit which is closed upon sensing a heat demand on the external load.

(Function) In this case, in the case of dedicated operation for the heater, the discharge capacity of the electromagnetic pump is determined by the resistance value of the resistor that intervenes in each capacity setting circuit that is switched and connected to the drive circuit of the electromagnetic pump by the temperature switch. The discharge amount shown in FIG. 7a is determined by .

However, when there is a heat demand from an external load, both capacity setting circuits are connected in parallel, and as a result, the resistance value becomes extremely small, so that the discharge amount of the electromagnetic pump becomes significantly large as shown in FIG. 7b.

Therefore, even when using an external load, there is no problem that the amount of heat radiated from the radiator decreases.

(Embodiment) Fig. 8 shows an embodiment of the present invention, in which 1 indicates a stove, and the stove 1 includes a burner 2, an electromagnetic pump 3 that supplies liquid fuel such as kerosene to the burner 2, and a combustor. A fan 4 and a radiator 5 connected to the burner 2 are provided, and a gas-liquid heat exchanger 6 for floor heating is provided in a bypass path of the radiator 5. A heat exchange fan 7 is provided which operates when heat exchange is required in the heat exchanger 6.

And the heat exchange coil 6a of the gas-liquid heat exchanger 6
A heat medium tank 9 and a circulation pump 10 are connected by piping 8.
The piping 8 on the side from which the heating medium is sent out from the coil 6a is connected to the piping in the heating panel (not shown) through the coil 6a, and there is a thermal temperature detection device for alternatively detecting the heat request of the external load by detecting the temperature of the heating medium. A sensor 11 is attached.

Although not shown in the drawings, the front of the case 12 includes an operation section including a temperature control button, a floor heating button, a timer button, etc., and a display section including a room temperature and floor temperature display lamp, a temperature control lamp, an operation switch, an operation lamp, etc. will be placed.

In the figure, 5-1 is a chimney connection port of the radiator 5.

FIG. 1 shows a wiring diagram of a control circuit showing an embodiment of the present invention.

In the figure, 13 is a temperature control circuit for the floor heating heat exchanger 6, 14 to 17 are relays, 18a is a pump board with a drive circuit 18 for the electromagnetic pump 3, 19 is a combustion blower motor, and 20 is for heat exchange. The fan motor, 21 is the motor of the circulation pump 10, 22 is the ignition circuit, 23 is a timer for setting the start time of the stove 1, and the temperature adjustment circuit 13 is connected to the power source S via a rectifier 24. The relay 1
4, the ignition circuit 22, and the pump board 18a are connected to a power source via the b contact 16b of the relay 16 or the self-holding contact 14-1a of the relay 14, the timer switch 23b of the timer 23, the operation switch 25, and the anti-seismic switch 26. The b contact 16c of the relay 16 intervenes in the ignition circuit 22. The motor 19 of the combustion blower is connected to the self-holding contact 14 of the relay 14.
-1a or the contact 14-1a of the relay 14 is connected to the power source S via the contact 16b or the contact 16a of the relay 16, and the motor 20 of the heat exchange fan is connected to the contact 14-1a of the relay 14.
14-2a or the a contact 16a of the relay 16, the heating prevention thermostat 27, the floor heating switch 28, and the temperature control circuit 1 of the gas-liquid heat exchanger 6.
A contact 17-2a of the relay 17 intervening in
is connected to the power supply S via the circulation pump 21.
The relay 21 is the a contact 2 of the pump switch 29.
It is directly connected to the power supply S through the pump switch 9a, and is connected to the contacts 14-1a and 14-2b of the relay 14 or the relay 1 through the b contact 29b of the pump switch 29.
6, the power supply S is connected via the heating prevention thermometer 27 and the floor heating switch 28.
connected to.

The relay 15 is connected to the B contact 16b or the A contact 16a of the relay 16, or the self-holding contact 1 of the relay 14.
4-1a and further a contact 14-2a of relay 14
and thermostat 27 for overheating prevention and changeover switch 3
The relay 16 is connected to the power supply S via the temperature switch 3 which detects a constant temperature of the radiator 5 and closes it.
0 to the power supply S.

The pump board 18a includes a drive control circuit 18 for the electromagnetic pump 3, and the drive control circuit 18 includes two capacity setting circuits 32 and 33 that set the discharge capacity of the electromagnetic pump 3 and are operated via a changeover switch 31. A contact 15a and b contact 15 of relay 15
This is achieved by selectively intervening and connecting by switching with b.
The configuration up to now is not particularly different from that conventionally known, and the changeover switch 31 is comprised of, for example, a room thermostat that detects a room temperature equal to or higher than a set temperature and switches the changeover.

In the present invention, both capacity setting circuits 32 and 33 are connected to the drive control circuit 18 of the electromagnetic pump 3 in parallel via a circuit 38 that is closed upon detecting the heat demand of the external load. This will be explained in detail below.The capacity setting circuit 33 shown in the figure is, for example,
Equipped with 450KΩ fixed resistance 35, capacity setting circuit 3
2 is equipped with a variable resistor 34 that can set a resistance value of up to 500KΩ, and the capacity setting circuit 33 includes a relay 15 operated through the temperature control switch 31.
The capacity setting circuit 32 is connected to the pump board 18a through the B contact 15b of the relay 15 and the A contact 15a of the relay 15, and the circuit 38 connecting both the capacity setting circuits 32 and 33 in parallel includes: In addition to the relay contact 17-1a, an a-contact 16a of the relay 16, which is activated by the operation of the temperature switch 30 that detects a constant temperature of the radiator 5, is also intervened.

In this case, at the time of ignition or when the room temperature is high, the capacity setting circuit 33 is connected to the pump board 18a, and the constant discharge amount set in the circuit 33 is supplied to the combustion burner 1. When the room temperature falls below the set temperature, the a contact 15a of the relay 15 is switched to the discharge amount set in the capacity setting circuit 32.

The drive circuit 18 of the pump 3 is constructed as shown in FIG. 6, as is conventionally known, and the discharge amount decreases as the resistance value of the capacity setting circuits 32 and 33 increases. Therefore, if the variable resistor 34 provided in the capacity setting circuit 32 is set to be larger than the resistance value of the fixed resistor 35, the dispensing capacity of the capacity setting circuit 33 will be higher than that of the capacity setting circuit 32, resulting in a problem.

For this reason, in the illustrated example, the variable resistor 34 is
A changeover switch 36 is provided which is closed in conjunction with this when set to 450KΩ or more.
A resistor 37 of 50KΩ is inserted in series with the fixed resistor 35 through the resistor 35, thereby solving the above-mentioned problem.

In the circuit of FIG. 1, reference numeral 39 indicates a ventilation switch, and the relay contact 16a connected in series with the contact 17-1a of the circuit 38 does not conduct unless the heat sink 5 reaches a certain temperature or higher.

The drive control circuit 18 of the electromagnetic pump 3 is a sixth
It has a configuration as shown in the figure, in which the dual capability setting circuits 32 and 33 intervene in the time constant oscillation circuit A of the drive control circuit 18.

Next, the operation of this combustion control circuit will be explained.

When closing the operation switch 25, the relay 16
The ignition circuit 22 and the electromagnetic pump drive circuit 18 are energized through the b contact 16b. Therefore, the electromagnetic pump 3 is driven and the ignition circuit 22 is activated.
This causes combustion to begin in burner 2. When the radiator 5 reaches a certain temperature due to the combustion, the temperature switch 30 closes and the relay 16 is energized.

Therefore, the ignition circuit 22 becomes inactive and the combustion blower motor 19 is activated, resulting in forced ventilation combustion.

When the room temperature is lower than the set temperature, the temperature control switch 31 is closed and the relay 15 is energized. Therefore, as shown in FIG. 4, the capacity setting circuit 33 is kept in the selected state,
As a result, combustion occurs at the fuel supply amount set in the capacity setting circuit 33. When the temperature rises to a certain level due to continued combustion, the selector switch 31
is closed and combustion occurs at the fuel supply amount set in the capacity setting circuit 32. These two capacity setting circuits 32, 33
The room temperature is kept constant while alternately selecting the upper and lower temperatures.

Next, the floor heating switch 2 that should activate the external load
8, the relay 17 is always energized in the startup state and issues a heat request, so the motor 20 of the heat exchange fan and the motor 2 of the circulation pump 10 are
1 is operated, the gas-liquid heat exchanger 6 exchanges heat, and the pump 10 circulates the heat medium between the external load and the gas-liquid heat exchanger 6.

If the temperature switch 30 is closed at this time, both capacity setting circuits 32 and 33 intervene in the drive circuit 18 of the electromagnetic pump 3 in a parallel-connected state, regardless of whether the room temperature is high or low, as shown in FIGS. 2 and 3. do. Therefore, the discharge capacity of the electromagnetic pump 3 becomes significantly larger as shown in FIG. 7B, compared to that shown in FIG. 7A, which is set in the capacity setting circuit 32.

When the temperature of the load rises and the heat demand disappears, the relay 17 intervening in the temperature control circuit 13 is deenergized, thereby causing its contacts 17-1a, 17
-Open 2a. Therefore, the motor 20 of the heat exchange fan stops, and both capacity setting circuits 32, 3
The series connection of 3 is broken. Therefore, the electromagnetic pump 3
The discharge amount becomes the discharge amount set in each capacity setting circuit 32, 33.

A variable resistor 34 interposed in the capacity setting circuit 32
When setting the resistance to a value greater than 450KΩ,
As shown in FIG. 5, the selector switch 36
Switch to contact 36-b. Therefore, the capacity setting circuit 3
When 3 is selected, a resistance of 500KΩ is substantially provided, and the discharge amount of the electromagnetic pump 3 becomes extremely small.

In the above embodiment, the changeover switch 31 is a room thermostat, but after a certain period of time from the time of ignition,
Needless to say, a timer switch or the like may also be used.

(Effect of the invention) As described above, according to the invention, two capacity setting circuits each including a resistor for setting the discharge capacity of the electromagnetic pump are provided in the drive control circuit of the electromagnetic pump.
For devices that selectively intervene and connect via a temperature control switch, we have provided a circuit that connects both capacity setting circuits in parallel and is closed when it detects the heat demand of the external load. When the capacity setting circuits are connected in parallel, the resistance value is significantly reduced compared to when each capacity setting circuit individually intervenes in the drive circuit of the electromagnetic pump, thereby increasing the discharge capacity of the electromagnetic pump. This has the effect of eliminating the inconveniences seen in the conventional example.

[Brief explanation of the drawing]

Fig. 1 is a control circuit diagram of one example of implementing the present invention;
5 are operating circuit diagrams thereof, FIG. 6 is a drive control circuit diagram of the electromagnetic pump, FIG. 7 is a characteristic curve diagram thereof, and FIG. 8 is a diagram showing the structure of the stove. 3... Electromagnetic pump, 18... Drive control circuit, 3
2, 33... Capacity setting circuit, 34, 35... Resistor.

Claims (1)

[Scope of utility model registration request] In the case of a burner equipped with a liquid fuel combustion burner, an electromagnetic pump that supplies fuel to the burner, a radiator, and a heat exchanger for a floor heater or other external load,
In the drive control circuit of the electromagnetic pump, in which two capacity setting circuits each including a resistor for setting the discharge capacity of the electromagnetic pump are selectively connected via a changeover switch, both capacity setting circuits are connected. , a combustion control circuit for a liquid combustion heater that intervenes in parallel with a drive control circuit via a circuit that is closed upon detecting a heat demand from an external load.