JPS6130167B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a kerosene combustion device equipped with a pre-purge function that operates only the blower motor before starting combustion.

FIG. 1 is a configuration diagram showing an example of a kerosene combustion device. In FIG. 1, 1 is a carburetor tube, 2 is a carburetor tube
3 is a flame that assumes that the mixture is combusting, 4 is a constant oil level vessel, and 5 is a flame port that is inserted into the constant oil level vessel. 6 is a solenoid valve provided at the kerosene outlet of the oil level regulator 5; 7 is a kerosene supply pipe whose one end is connected to this solenoid valve for guiding the kerosene 5 into the vaporizer cylinder 1; 8 is a kerosene supply pipe; A wind tunnel 11 that guides air sucked in from the suction port 10 into the vaporizer cylinder 1 by the operation of the blower motor 9.
, where the opening at the tip of the kerosene supply pipe 7 is located. Reference numeral 12 denotes a branch pipe for applying the static pressure of air blown through the wind tunnel 11 onto the kerosene 5 surface in the oil level regulator 4 and pushing out the kerosene 5 to the kerosene supply pipe 7;
3 is an igniter, and 14 is a discharge electrode of the igniter 13, which discharges between the igniter 13 and the vaporizing tube 1 to ignite the air-fuel mixture ejected from the flame nozzle 2.

15 is installed on the outer circumferential surface of the vaporizer cylinder 1;
A heater 16 is a thermostat that detects the temperature of the vaporizing cylinder 1.

Figure 2 shows an example of a conventional combustion control circuit with a pre-purge function in the configuration shown in Figure 1. In Figure 2, 17 is an AC power supply, and 18 is turned on when the room temperature is lower than the set temperature. , a room thermostat that turns off when the room temperature is higher than the set temperature; 19 is a control device that has terminals a to c; It has a function of connecting between a and b.

Here, the heater 15 is connected to an AC power source 17 via terminals A and C of a thermostat 16.

The room thermostat 18 and the blower motor 9, which are connected in series, are connected to an AC power source 17 via terminals B and C of the thermostat 16.

A terminal a of the control device 19 is connected between the room thermostat 18 and the blower motor 9, and a terminal c is connected to one side of the AC power source 17.

Solenoid valve 6 and igniter 13 connected in parallel
is connected to terminal b of the control device 17 on the one hand, and terminal c on the other hand.
connected to.

Next, the operation of the conventional system will be explained with reference to FIGS.
6 connects between contacts B and C. At this time, if the room temperature is lower than the set temperature and the room thermometer 18 is turned on, the blower motor 9 is operated and the wind tunnel 1
1, air is blown into the vaporizer cylinder 1, and pre-purge is started. When a preset time T ₁ has elapsed since the start of this pre-purge and the control device 19 is connected from between terminals a and c to between terminals a and b, the solenoid valve 6 and the igniter 13 are energized. The kerosene 5 in the oil level regulator 4, which had been shut off by the solenoid valve 6, is sent to the kerosene supply pipe 7.

At the tip 8 of the wind tunnel 11, the kerosene sent to the kerosene supply pipe 7 is injected into the vaporizer cylinder 1 in a dew shape by the air flow from the blower motor 9, collides with the inner wall surface of the vaporizer cylinder 1, and is vaporized. It mixes with air and moves upward, and is ejected from the flame port 2 as a mixture. This ejected air-fuel mixture is transferred to the discharge electrode 1 of the igniter 13.
4 and the vaporizer cylinder 1, ignition occurs and combustion begins. Then, when the room temperature is warmed by combustion and becomes higher than the set temperature of the room thermostat 8, the room thermostat 18 turns OFF, stopping the power supply to the blower motor 9, solenoid valve 6, and igniter 13, and extinguishing the fire. Solenoid valve 6
Since the kerosene is closed, kerosene 5 remains up to the tip of the kerosene supply pipe 7.

Then, when the room temperature becomes lower than the set temperature of the room thermometer 18 and the room thermometer 18 is turned "ON" again, combustion starts in the same manner as described above. This has the drawback that it is sucked into the vaporizer cylinder 1 by the airflow caused by the air flow 9, vaporizes, and is sent into the room, causing odor.

FIG. 3 is a time cheat diagram of the combustion control shown in FIG. 2. In FIG. 3, the vertical axis represents the operation of each component, and the horizontal axis represents time.

The time axis of the operation starts from the time when the vaporizer cylinder 1 is heated to the set temperature and the thermostat 16 is connected to the contact point B.

During the pre-purge time T ₁ , if kerosene has accumulated in the vaporizer cylinder 1 for some reason, or dirt or dust has entered it, if the ignition operation is started immediately, the mixture ratio will change and the red flame will be emitted. This is to blow away the accumulated kerosene and dirt before ignition, and is particularly common in combustion control of this type of kerosene combustion equipment.

The present invention aims to eliminate the above-mentioned conventional drawbacks and prevents the generation of unburned gas during pre-purging.One embodiment of the present invention will be described below.

FIG. 4 shows a combustion control circuit according to an embodiment of the present invention.

In FIG. 4, 20 is a control device having terminals d to h, which has a function of connecting terminal d and terminals g and h when a predetermined set time has elapsed after the power supply 17 was supplied between terminals d and f. When a predetermined set time elapses after the room thermometer 18 is turned off, the terminals e and g are connected for a certain period of time, and then the terminals e and g are opened again.

In this control device 20, the terminal d is connected to the room thermometer 18.
The terminal e is connected directly to the terminal B of the thermostat 16 through the contact B of the thermostat 16.

A terminal f of the control device 20 is connected to one end of the AC power source 17, a terminal g is connected to one end of the AC power source 17 via the solenoid valve 6, and a terminal h is connected to one end of the AC power source 17 via the igniter 13.

Next, the operation of the above embodiment will be explained with reference to FIGS. 1 and 4. First, when the vaporizing cylinder 1 heated by the heater 15 reaches a set temperature or higher, the thermostat 16 is connected to the contact point B.

When the room temperature is low and the room thermometer 18 is turned on, only the blower motor 9 operates, blowing air into the wind tunnel 11, and pre-purging is performed in the same manner as in the conventional example.

Next, when the pre-set pre-purge time _T1 has elapsed, the terminal d of the control device 20 and the terminals g and h are connected, and the solenoid valve 6 and the igniter 13 are connected to the power source 1.
7 is supplied.

Therefore, the solenoid valve 6 opens, and the kerosene 5 in the oil level regulator 4 is sent to the kerosene supply pipe 7, and the tip 8 of the wind tunnel 11 is
The mixture is blown into the vaporizer cylinder 1 together with the air flow, and is ejected from the flame port 2 of the vaporizer cylinder 1 as an air-fuel mixture. Then, a discharge is generated from the electrode 14 of the igniter 13, igniting the air-fuel mixture and starting combustion.

Then, when the room temperature rises due to combustion and becomes higher than the set temperature of the room thermometer 18, the room thermometer 18 is turned "OFF" and the blower motor 9,
The solenoid valve 6 and igniter 13 are cut off from the power source 17. Therefore, the rotation of the blower motor 9 is stopped and the solenoid valve 6 is closed, so that combustion is stopped and the fire is extinguished.

When time T ₂ has elapsed after extinguishing the fire, terminals e and g of the control device 20 are connected for time T ₃ ,
Since the solenoid valve 6 is opened, the kerosene remaining at the tip of the kerosene supply pipe 7 is naturally drawn to the leveler 4 side by falling down to the kerosene level in the leveler 4.

After that, when the room temperature becomes lower than the set temperature of the room thermometer 18 again and the room thermometer 18 turns "ON", pre-purge starts, but the kerosene supply pipe 7
Since there is no kerosene left at the tip of the kerosene, kerosene is not drawn out and does not come out, and there is no odor caused by unburned gas during pre-purge.

Figure 5 is a time chart of combustion control in the embodiment shown in Figure 4, where the vertical axis represents the operation of each part;
The horizontal axis shows time.

The time axis of the operation starts from the time when the vaporizer cylinder 1 is heated to the set temperature and the thermostat 16 is connected to the contact point B.

Here, the time T ₂ is a time set in consideration of the time during which the blower motor 9 can stop rotating due to inertia after the AC power supply 17 is cut off.
T ₃ is a time set in consideration of the time required for the kerosene remaining at the tip of the kerosene supply pipe 7 to return to the oil level in the oil level regulator 4 .

Figure 6 is a diagram showing the difference between the cases with and without the above-mentioned time T ₂ and time T _3. Figure a shows conventional combustion control, where once combustion is completed, the room thermometer is turned on and combustion is started. FIG. 7 is a diagram showing a state in which kerosene remains up to the tip of the kerosene supply pipe 7 when the kerosene is started. Figure b shows the combustion control of the present invention. After the rotation of the blower motor 9 has stopped, the solenoid valve 6 is opened for a predetermined period of time _T3 , so that the kerosene at the tip of the kerosene supply pipe 7 flows into the kerosene 5 in the oil level regulator 4. It is a figure which shows that it returned to the level of.

As described above, according to the present invention, it is possible to prevent the occurrence of odor due to unburned gas (mixture) at the start of combustion in a kerosene combustion device equipped with a pre-purge function, and in particular, blow the burned gas directly into the room. It is extremely effective for indoor open type kerosene burning equipment.

Also, even if the combustion device does not have a room thermostat,
It is effective as a countermeasure against the odor of unburned gas at the start of combustion.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing an example of a kerosene combustion device;
FIG. 2 is a conventional combustion control circuit diagram, FIG. 3 is a time chart of the control circuit shown in FIG. 2, and FIG. 4 is a control circuit diagram of a kerosene combustion device showing an embodiment of the present invention.
FIG. 5 is a time chart of the control circuit shown in FIG. 4, and FIG. 6 is a comparison diagram between the conventional circuit and the circuit according to the present invention. 1 is a vaporizing cylinder, 4 is a constant oil level device, 5 is kerosene, 6 is a solenoid valve, 17 is an AC power supply, 18 is a room thermometer, 2
0 is the control device.

Claims (1)

[Claims] 1. Place the opening at the tip of the kerosene supply pipe connected to the constant oil leveler at the tip of the wind tunnel, expose it to the inside of the vaporizing cylinder, and send air into the wind tunnel using the blower motor. The extracted air blowing pressure is applied to the oil level of the oil level regulator to push the kerosene out of the kerosene supply pipe, atomize it at the tip of the wind tunnel by air flow, spray it into the vaporization cylinder, vaporize it, and burn it. In a device equipped with a pre-purge function that operates only the blower motor before starting combustion, a solenoid valve is provided between the tip opening of the kerosene supply pipe and the oil level regulator, and the solenoid valve is activated at the same time as the combustion stops. A kerosene combustion device characterized in that the electromagnetic valve is operated to close, and after a predetermined time has elapsed during which combustion has stopped and the rotation due to inertia of the blower motor has stopped, the solenoid valve is again operated for a short time to open.