JPS6119327Y2 - - Google Patents

Description

[Detailed description of the invention] This invention heats the vaporization cylinder with an ignition burner, then supplies liquid fuel into the vaporization cylinder with a spray device to vaporize the fuel, and then mixes the obtained vaporized fuel with air and burns it. This relates to a liquid fuel combustion device that burns liquid fuel by sending it to the mouth. By the way, when controlling this type of combustion device, the operation of the ignition burner is used only for preheating the carburetor cylinder, and blue flame combustion cannot be expected unless the operation is stopped during steady combustion. However, if, for example, a thermocircuit that controls the temperature of hot water is activated due to the cessation of combustion, or if the power switch is opened, the spray device will stop operating, but due to the inertia of the fan, the mixture of vaporized fuel and air will be There is a problem in that the excess air ratio increases and unburned gas and strong odors are generated. The present invention solves this problem and will be specifically explained below based on an embodiment shown in the drawings. 1 is the main body of the liquid fuel device, 2 is a bottomed cylindrical inner cylinder with a number of combustion ports 3 on the side wall, and 4 is an inverted bottomed cylindrical type installed to cover the opening 5 provided at the center of the bottom of the inner cylinder 2. It is a vaporizer cylinder. Reference numeral 6 denotes an outer cylinder that surrounds the inner cylinder 2 and forms an air-fuel mixture supply passage 7 . Reference numeral 8 denotes a blower tube which penetrates the bottom of the outer cylinder 6 and has its tip opened into the vaporizer tube 4, and the other end of the blower tube 8 is connected to an outlet of a fan (not shown). Reference numeral 9 denotes a spray device that faces the closed surface of the vaporizer cylinder 4 from the opening inside the blower cylinder 8. 10 is an ignition burner;
0 is a burner cylinder 11 installed from the side of the main body 1 in the tangential direction of the inner cylinder 2, passing through the outer cylinder 6 and the inner cylinder 2.
It consists of a spray nozzle 12 and an igniter 13 provided inside. 14 is a bypass pipe that connects the blower tube 8 and the burner tube 11. 16 is an electromagnetic pump, 17 is a pilot valve, and 18 is a main valve.

Next, the electric circuit implemented in the present invention will be explained. 20 is a power supply, 21 is a fan motor 22, an electromagnetic pump 16, a pilot valve 17, a main valve 1.
8. A burner circuit having an igniter 23 connected to the igniter 13. 24 is a transformer, 25 is a rectifier, 26 is a smoothing capacitor, and 27 is a discharge resistor. 28 is a power supply 20 and a burner circuit 21
This is an operating circuit for a relay 30 that opens and closes a contact 29 connected between the relay 30 and the circuit 28.
A comparator 31 connected to the base of a transistor 31' connected in series with 0, a CR type discharge timer 34 consisting of a capacitor 32 and a resistor 33 connected in parallel to the input terminal of the comparator 31, and a collector of a transistor 38 to be described later. and an input signal circuit 35 of the comparator 31 connected thereto. 36 is a power switch, and 37 is a thermo circuit which shuts off transistor 38 when the water temperature drops, and turns on transistor 38 when the water temperature reaches a set temperature. 39 is resistance 40
A CR type timer has a resistor 40 and a capacitor 41 connected in series, inputs the voltage at the connection point between the resistor 40 and the capacitor 41 to the switch circuit 42, and connects the capacitor 41 in series.
When charging is completed, the transistor 43 is made conductive and the prepurge relay 44 is operated.
45 is a reactivation circuit for the ignition burner, and comparators 46 and 4
7, a transistor 48 whose base is connected to the output terminal of the comparator 47, a relay 49 connected in series with the transistor 48, a resistor 50 and a capacitor connected in series between the output terminal of the comparator 46 and the input terminal of the comparator 47. A timer circuit 52 consisting of 51 and
, an input signal circuit 53 connected to the collector of a transistor 69, which will be described later, a circuit 54 connected to the collector of the transistor 31', and a capacitor 55 connected to both circuits respectively, with the connection point connected to the input terminal of the comparator 46. It consists of. Reference numeral 56 denotes a flame detection circuit that detects the temperature inside the air supply passage 7. When a certain temperature rise is detected, a signal is sent to the base of a transistor 60 connected in series with the relay 59 through circuits 57 and 58, and this transistor 60 is activated. It conducts electricity. 61 is resistor 62 and capacitor 6
During the set time of the timer 61, the output of the comparator 63' is kept low and the signal from the flame detection circuit 56 is bypassed by the circuit 64. 65 is a transistor 38
This is a self-holding circuit that includes a transistor 68 that is turned on when the transistor 38 is cut off by a circuit 66 and a circuit 67 connected to the collector of the transistor 38, and a transistor 69 that self-maintains the conduction state of the transistor 68. 70 is conductive when the transistor 43 is cut off;
This is a transistor that causes the circuit 71 to stop the operation of the timer 61. The resistor 40 of the timer 39 is connected to the collector of the transistor 38 via a diode 72, and is connected in parallel to the final stage of the constant voltage power line set by the Zener diode 73 after the power switch 36 via diodes 74 and 75, respectively. Circuit 76 among the connected circuits 76 and 77
is connected to the collector of transistor 38, and circuit 77 is connected to circuit 53. Furthermore, pre-purge relay 4
4 closes the contact 78 when operating, and the relay 59 switches the contact 79 to the main valve 18 side when operating.
Reference numeral 9 closes the contact 80 during operation to form a bypass circuit for the contact 78. Also, reactivation circuit 4
5. The power supplies of the relay 49 and the self-holding circuit 65 are both connected to the power line before the power switch 36. Further, the circuit 81 is a circuit that bypasses the signal from the circuit 67 to the self-holding circuit 65 when the transistor 43 is conductive.

The present invention has the above configuration, and the power switch 3
6, the water temperature is low, so there is no output signal from the thermo circuit 37 and the transistor 38 is in a cut-off state, and an input signal is sent from the circuit 66 and circuit 35 to the comparator 31 in the operating circuit 28, A high voltage is obtained at the output terminal of transistor 31'
conducts, the relay 30 operates, the contact 29 is closed, and the fan motor 22 is energized. At the same time, the timer 39 starts operating to charge the capacitor 41, and the transistors 68 and 6 in the self-holding circuit 65 are activated by signals from the circuits 66 and 67.
9 self-maintains in a conductive state. (Prepurge) When the timer 39 completes its operation, the switch circuit 42
When the transistor 43 is activated, the pre-purge relay 44 is activated, and the contact 78 is closed to energize the electromagnetic pump 16, the pilot valve 17, and the igniter 23. Therefore, the liquid fuel is discharged from the spray nozzle 12 of the ignition burner 10. is sprayed, the sprayed fuel is ignited by the igniter 13, and the ignition burner 10 burns, heating the vaporizing cylinder 4. Further, due to the conduction of the transistor 43, the transistor 70 is cut off, and the operation of the timer 61 is started. The air sent from the blower tube 8 due to the combustion of the ignition burner 10 is also heated in the same way as the vaporizer tube 4, and a detection element A such as a thermistor placed in the air feed passage 7 detects when the temperature of this heated air exceeds a set value. A flame detection signal is output from the flame detection circuit 56 to the circuit 57, but during the operating time of the timer 61, the voltage at the output terminal of the comparator 63' is low and the flame detection signal is bypassed by the circuit 64, and the ignition burner 10 is It is forcibly burned for a set time of 61. (Preheating) When the preheating is completed, that is, the timer 61 completes its operation, and the flame detection circuit 56 outputs a detection signal to the circuit 57, the transistor 60 becomes conductive, and therefore the relay 59 operates, so the contact 79 is connected to the main The switch is switched to the valve 18 side, and liquid fuel is sprayed from the spray device 9 into the vaporizer cylinder 4. The sprayed fuel is instantaneously vaporized and mixed with the blast air, and the resulting air-fuel mixture passes through the air supply passage 7 and is combusted. The residual flame of the ignition burner 10 is sent to the combustion port 3 and ejected into the inner cylinder 2, and the operation is stopped in the same way as the operation of the spray device 9. Water in a water chamber (not shown) is heated. (Steady combustion) By the way, when combustion in this type of combustion device is stopped, as mentioned above, the excess air ratio of the mixture increases due to the inertia of the fan and becomes non-flammable gas, causing problems such as the generation of white smoke and a strong pungent odor. Ta. Therefore, the present invention solves this problem by forcing the remaining air-fuel mixture to burn by restarting the ignition burner 10 for a certain period of time at the end of steady combustion. That is, when the water temperature reaches the set temperature, when the transistor 38 becomes conductive, the power signal is sent to the circuit 76 via the diode 74, bypassing the circuit 77, and when the pre-purge ends, the transistor 69 is already in the cut-off state, so the circuit is closed. No signal is sent from the circuit 53, and the input signal from the circuit 35 to the comparator 31 of the operating circuit 28 disappears due to the conduction of the transistor 38, but for a certain period of time until the charge in the capacitor 32 is purged by the discharging operation of the timer 34. Since the output terminal of the comparator 31 remains at a high potential, the transistor 31' is in a conductive state, so that no signal is sent from the circuit 54 either. Therefore, the output voltages of both the comparators 46 and 47 become high, the transistor 48 becomes conductive, the relay 49 operates and the contact 80 is closed, the pilot valve 17 and the igniter 23 are energized again, and the ignition burner 10 is ignited. It is. The operation of this relay 49 is limited to the operating time set by the timer 52, and the operation stops when the capacitor 51 is fully charged.

Also, when the power switch 36 is opened, the circuit 5
The signals from circuits 3, 54 and 35 both disappear, and relays 30 and 49 operate for a certain period of time as described above.

As described above, in the present invention, when combustion is stopped, the ignition burner is ignited again and the air-fuel mixture remaining in the air supply passage 7 is forcibly combusted by the flame of the ignition burner 10, so that the air-fuel mixture becomes non-flammable gas. As a result, no white smoke or pungent odor is generated, and the vaporizer cylinder 4
By heating the vaporized fuel, re-liquefaction of the vaporized fuel is prevented, and an extremely useful liquid fuel combustion device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is an electric circuit diagram, and FIG. 3 is an explanatory diagram showing a combustion sequence. 3... Combustion port, 4... Vaporizer tube, 7... Air supply passage, 9... Spray device, 10... Ignition burner, 34
...Timer, 52...Timer.

Claims (1)

[Scope of utility model registration request] The above-mentioned one has an ignition burner that heats the vaporization cylinder, a spray device that supplies liquid fuel to the vaporization cylinder, and an air supply passage that supplies a mixture of vaporized fuel and air generated in the vaporization cylinder to the combustion port. The atomizing device is operated under the set heating condition of the carburetor cylinder, the ignition burner is stopped, and the ignition burner is restarted for a set time of a timer that is activated at the same time as the atomizing device stops operating as combustion stops. liquid fuel combustion equipment.