JPS6144210A - Evaporating type kerosene burner - Google Patents

Abstract

PURPOSE:To remove a tar content during initial adhesion and to prevent the occurrence of choking with tar, by a method wherein an oil-soaked wick is automatically burnt to remove tar after stopping of combustion. CONSTITUTION:By breaking a switch SW1 for stopping of combustion, a relay RY3 is turned ON. Since a thermostat 31 is also turned ON right after combustion, a current flows through a circuit formed with a heater 18, the thermostat 31, and the relay RY3 irrespective of the switch SW1 being turned OFF to heat an evaporator 1. In which case, since a thermistor 21 is rendered inoperative, the temperature of the evaporator 1 exceeds temperature prevailing during combustion for increase to about 500 deg.C to burn an oil-soaked wick. During said burning of the oil-soaked wick, the temperature of a combustion chamber body is gradually decreased, and when the temperature of a warm air is decreased to a value lower than a specified temperature, the thermostat 31 is turned OFF to disconnect the flow of a current to the heater 18, and this completes burning of the oil-soaked wick.

Description

[Detailed Description of the Invention] The present invention relates to a vaporizing oil combustor in which petroleum is preliminarily vaporized in a vaporizer by heating and then supplied to a burner through a nozzle to be burned. Concerning the removal of tar generated indoors.

In conventional vaporization oil combustors, when kerosene vaporizes in the vaporization chamber during combustion, the vaporization temperature (approximately 150 to 280 degrees Celsius)
It gradually turns into tar due to polymerization of molecules within the combustion chamber or minute residual impurities, etc., and tar/I/(m compound) gradually adheres to the vaporization chamber and vaporization stabilizer as the combustion time progresses. Although the amount of tar varies depending on the temperature of the vaporizer, the method of vaporizing the kerosene, and the temperature rise of the kerosene, the generation of tar was unavoidable.

Therefore, if the tar adheres to and accumulates in the vaporization chamber and vaporization stabilizer, the vaporization passage will become clogged, the amount of vaporized gas will decrease, the amount of combustion will be small, and combustion will occur, eventually becoming unusable. There was a problem in terms of lifespan.

Therefore, as a solution to this problem, there is a method in which the vaporization chamber and vaporization stabilizer are replaced once every two to three seasons, but even this method still poses problems from a product standpoint. Ta.

The present invention has been devised in view of the above-mentioned matters, and is intended to remove tar attached to the vaporization chamber and vaporization stabilizing material by dry firing at a temperature higher than the normal vaporization temperature. .

Experiments of the present invention were conducted using a Bunsen combustion type vaporizer.

The outline of the experiment is to maintain a constant vaporization temperature (2
In a vaporizer that controls power supply to a heater (approximately 350 W) at 40 to 280°C, the temperature inside the vaporizer can be adjusted to 450 to 500°C by short-circuiting the temperature control circuit and continuously energizing the heater. ℃, and the vaporization chamber and vaporization stabilizer were heated dry in this high-temperature atmosphere.

The experimental results were as follows.

Note that the above data shows that the vaporization stabilizer is completely clogged with tar, but it is thought that the condition will be better if dry firing is performed earlier.

In addition, in the table above, "forced air" refers to a method of blowing air into the vaporization chamber by running the oil pump idly (3 to 5 cc/mi).
``Natural convection'' is a method in which the oil pump is stopped and air is naturally sent into the vaporization chamber through the oil pipe and return pump.

As is clear from the above experimental results, the vaporization stabilizing material that has failed to burn due to tar clogging (if the amount of gas ejected is small and the flame is not normal even after ignition) is left as is in an atmosphere of about 500℃ for 1 to 2 hours. It has been found that dry firing can almost completely restore the original state.

In addition, when dry firing for 1 hour in an atmosphere of 300℃, the
%, and the effect is extremely weak. As described above, the dry firing according to the present invention enables long-term use without replacing the vaporization stabilizer, resulting in excellent durability.

The case of a Bunsen type gasification combustor will be described in detail below as an embodiment of the present invention.

1 is a brass vaporizer body that forms a vaporization chamber 2, and a gas injection nozzle with a nozzle hole 3 at the top thereof °/L/4
At the same time, the connection part 5 on the lower side wall is removably screwed on.
, 6 are connected to an oil feed pipe 8 that communicates with an oil feed pump 7 and a return pipe 10 that communicates with a normally open solenoid valve 9 that is closed when energized.

Reference numeral 11 denotes a cap that is detachably attached to the lower end opening of the carburetor main body 1.

The workpiece 2 is a cylindrical brass vaporization aid that is inserted into the vaporization chamber 2 from the lower end opening of the vaporizer main body 1. 13, and its lower end slightly protrudes from the lower end opening of the vaporizer main body 1, which serves as a hand when taking out the vaporization aid 12.

Reference numeral 14 denotes a recess formed in the lower cylindrical portion 12b, in which a nug ring 15 for always urging the vaporization aid 12 upward is housed. The lower end of the 16-piece upper cylindrical portion 12a (
That is, the inside and outside of the cylindrical part 12a are communicated through a plurality of holes drilled near the connecting part with the lower cylindrical part 12b. Reference numeral 17 denotes a vaporization stabilizing material such as foamed metal or sintered metal inserted into the upper cylindrical portion 12a of the auxiliary tool 12.
It can be taken out from inside the vaporization chamber 2 together with the vaporization chamber 2.

Reference numeral 18 denotes a heater which is closely attached to the side wall of the carburetor main body 1, and is always pressed against the carburetor main body 1 side by a nulling ring 19, and the outside thereof is covered with a cover 20. The heater 18 has a temperature sensing element 21 during normal combustion.
(Positive Therminuta) and the electronic control circuit U22 control the temperature inside the vaporizing chamber 2 to reach 240 to 280°C, and when it is not heated, the temperature sensing element 21 is short-circuited and the electronic control circuit 22 is activated. In this way, the pressure is controlled so that the temperature inside the vaporizing chamber 2 reaches approximately 500° C. by continuously supplying electricity. Note that 23° is a fuel tank and 24 is a burner.

FIG. 2 is an electrical circuit diagram of the vaporizing oil combustor of the present invention, in which the heater 18 is connected in series to a normally closed relay switch 25 that is turned on and off by an electronic control circuit 22. The series circuit 25 is connected in parallel to the series circuit of the solenoid valve 9 and the normally open relay switch 26. The relay switch 26 is closed by the electronic control circuit 22 when the temperature inside the vaporization chamber 2 reaches a predetermined temperature (240 to 280°C).

27 is a switch connected in series to the oil pump 7, and if you want to forcefully blow air when the vaporizer is running dry, you can turn it ON and OFF in conjunction with the main switch 28, or manually if you want to use natural convection. All you have to do is turn it on and off with .

Reference numeral 29 designates a short-circuit switch connected in parallel to the temperature sensing element 21, which is turned on when the vaporizer is idle to short-circuit the temperature sensing element 21 and pressurize the electronic control circuit so as not to operate.

Here, the operation of the vaporizing oil combustor of the present invention will be explained. First, when performing normal combustion.

Turn on the main switch 28 and turn on the switch 27
When N is selected, the oil supply cylinder 7 is driven and the heater 1 is activated.
8 is energized, and the vaporizer main body 1 is heated.

Initially, the temperature of the vaporizer body 1 was low, so the relay switch 2
6 is in the OFF state, and the solenoid valve 9 is opened. Therefore, the kerosene sucked up from the fuel tank 23 by the drive of the oil feed pump passes through the oil feed vibrator 8 and enters the vaporizer main body 1 (through the gap between the inner wall of the vaporizer main body 1 and the outer wall of the vaporization aid 12). A circulation path is formed from the return vibe 10 through the solenoid valve 9 and back to the fuel tank 23.

When the temperature of the vaporizer main body 1 reaches a predetermined temperature by energizing the heater 18, the resistance value of the temperature sensing element 21 changes rapidly, the electronic control circuit 22 is activated, and the relay switch 2 is activated.
6 is closed. Therefore, the electromagnetic valve 9 is energized, the return passage is cut off, and the liquid level of the kerosene that has flowed into the carburetor body 1 gradually rises. Then, kerosene is poured into the small hole 1 of the auxiliary tool 12.
6 and penetrates into the vaporization stabilizing material 17, where it vaporizes.

The vaporization temperature at this time is 240 to 280°C, and the relay switch 25 is turned on and off by the electronic control circuit 22.
The F control controls the time during which the heater 18 is energized, and the temperature in the vaporization chamber 2 is constantly maintained at 240 to 280°C.

In this way, the vaporized gas vaporized in the vaporization chamber 2 is supplied into the burner 24 through the nozzle hole 3 of the gas injection nozzle/L/4, and normal combustion is performed on the burner 24.

Next, dry firing of the vaporizer will be explained.

■ When driving the oil cylinder 7 to perform dry firing by forced air blowing, drain the remaining oil from the fuel tank 23, turn on the short circuit switch 29 to prevent the electronic control circuit 22 from operating, and turn on the main switch 28. Turn on. Then, the heater 18 is continuously energized, and air is supplied by the idling of the oil supply pump, and the temperature inside the vaporization chamber 2 reaches 500.
℃, the tar adhering to the vaporization chamber 2 and the vaporization stabilizer 17 is thermally decomposed and removed.

(2) When dry heating is performed by natural convection without driving the oil pump 7, the same operation as (2) above may be performed after manually setting the switch 27 to 0FFL. In this case, air is supplied to the vaporization chamber 2 through a normally open electromagnetic valve 9.

The above is the operation when performing dry firing, but it is also possible to perform dry firing for a certain period of time at the time of ignition preheating every time. The dry firing time is short and good.

Next, details of the circuit of a vaporizing oil combustor embodying the present invention will be explained with reference to FIG. 3. In FIG. 3, 21 is a positive temperature coefficient thermistor, which controls the temperature of the vaporizer 1 to be constant. SWI and SW2 are integrated power switches.
SWI is an automatic release switch. x, l Yl
is a power transformer for the electronic circuit, a timer that controls the TVi combustion start time and combustion end time, RYI, RY2 are magnetic relays, PT is a pulse transformer, D is a diode, C is a capacitor, RI r R2... is a resistor, Q + +Q2 ... is transition y, p, I C1
-+ -I C1-4 is a comparator, TS is a vibration control switch, G is a ground terminal, FL is a frame rod, LE
D is a light emitting diode.

[Explanation of circuit operation]

(1-1) First, when switches sw, , sw2 are turned on (at this time, SW2 is only turned on for a moment), voltage is applied to the primary side Voltage is generated and the coil of RY2, RI a r
Q+ is ONL through D7 r R8, resulting in relay RY.

Even if the operation SW2 is turned OFF, it maintains itself and the power lamp LED+ lights up.

(1-2) If the timer T is “continuous” or “time up J”, the pump 7 is energized and at the same time D 4 +
Power is applied to the photocoupler PCI through R2r R3.

(:1-3) Since the light-receiving transistor of the PCI is turned on, the base voltage of the transistor Q2 is applied through R5, R9r and R10, and since Q2 is turned on, the comparator IC+-+K voltage' is applied.

[1-4] Since the temperature of the positive characteristic thermistor 21 is low, the resistance is (i<IC+-+, the output is "low", so the transistor Q6 is 0FFIC.

(1-5)) Full-wave adjustment (
At the point where the base current flows (preheating) and the current is zero,
Since Q7 is OFF, C1 is connected through R43°R46.
Charged to 0.

When Ql turns ON, the charge charged in C10 is discharged to the vane of transistor Qg-Q4, and Qs, Q< is - instantaneous O
A current flows through the coil/l' of NL Barnutfun 7PT, turning on the triac TR. 'L對、cLsllJJLl
(Ii 74 Rizutsu.

The heater 18 is turned on by the zero-cross triggered triac TR.

(+-6) When the vaporizer 1 is heated by the heater 18, the resistance of the old characteristic thermistor 21 attached to the vaporizer increases, and the output of the comparator IC, - is reversed from "low" to "high". .

As a result, transistor Q6 becomes ONL balne transformer TR
Toba) V NuJuhao F F becomes triac TR
In order to turn off the heater 18, the power to the heater 18 is turned off.

(+-7)I The positive input of C1-2 is R]st D
Since it enters through srCa (ignition movement f''''), the output of IC, is reversed from "low" to "high" and transistor Q3 is turned OFF.
NL relay RY is turned ON. RY.

When turned on, the igniter IGN convection blower FM solenoid valve 9 is energized.

(1-8) Since RYz turns on, the self-holding signal of RIll+D7 is lost, but as mentioned in (+-8), when transistor Q2 turns on, voltage is applied to the entire electronic circuit 21, so ICl- The holding signal from 4 continues to flow through DI2 r D8, turning on Ql, and the self-holding of RY is maintained.

(1-9) The carburetor 1 is caused by the discharge spark of the igniter IGN.
When the vaporized gas from Q5 is turned on and the LED lights up.Also, a holding signal is output to the base of Ql through R34+DlO+Rδ.

(1-10) The output of I CI-2 changes to "high",
(After completion of preliminary (fire judgment) heating) After a certain period of time, IC+
The potential of C11 rises due to the output from -2, and IC...
The output of R41+ DI2+ is reversed from "high" to "low"
The holding signal from R11 disappears. At this time, when there is no holding signal from rc, , Ql is 0FFLRY, also OFF
In other words, if the igniter IGN is discharged for a certain period of time and still does not ignite, the operation is automatically stopped.

(1-11) After starting combustion, the positive characteristic thermistor (
temperature control), -2□1: I :yAv-1-I C
The output of +-+ cycles from "high" to "low", and as a result, the heater 18 performs ON-OFF operation, and the vaporizer 1 switches to 150
Maintain temperature between ℃ and 280℃.

At this time, even if the ICl-1 output is "low", IC1-z remains "high" due to the discharge charge from C6, but if no charge is supplied from I C+, -1 even after a certain period of time has passed. is turned off.

[About dry firing method]

FIG. 4 shows a concrete circuit of the dry firing means newly added to the circuit as described above. FIG. 4 corresponds to the circuit section 30 surrounded by a dashed line in FIG. 3, and the same parts as in FIG. 3 are denoted by the same reference numerals.

In FIG. 4, R104+R1°5 is a newly added resistor, and switches SWA and SWB are dry firing instruction switches.

In the case of this circuit, by operating the dry firing SWAs and B, the dry firing operation can be performed immediately before or even during combustion.

[When performing dry firing before starting combustion]

(2-1, 1SWI When SW2 is turned on (see (+-+) - (:l-3) above for the circuit operation at this time), the electronic circuit 21 operates and performs self-holding, and at the same time starts preheating.

(2-2) Normally, the level on the − side of IC,−, is R1
□ and R1゜6. A voltage determined by the combined resistance of R104 is applied, but when the dry firing switches swA and swB are manually operated and SWA is opened, the voltage determined by RI2 and R104 is applied to the level of the - circle of XC, -. However, since this becomes a higher resistance than in the normal case, the -sub level becomes higher, so the potential on the + side of IC, -1 becomes higher than in the normal case, that is, unless the temperature is high, rc, , -, the output is increased, and the temperature control state of dry firing is higher than the normal control temperature (for example, 300 ° C to 500 ° C),
Also, in normal cases, when the output is higher than the IC, - (preheating is completed), the operation progresses as described above (+-6) (+-8), but since the SWB is closed, the output is higher than the IC,. The output is R
16°D, the comparator for SWB and the flow ICl-2 does not change from "low" to "high" and remains in the "low" state, so it is necessary to shift to the ignition operation. However, since the output of XC,- operates Q6, the same temperature control as during combustion is performed.

As above (operate S Wl, S Wz (simultaneous operation SW
) By operating the dry firing s WA, B (simultaneous operation SW), the carburetor main body 1 can be heated to a temperature higher than the temperature control during normal combustion. If you want to stop dry firing, just return the switches SWA and SWB to their original states.

[When performing dry firing during combustion]

(8-1) When operating 5wA, n during combustion, the above [2
-1), As described in (2-2), the control temperature changes as soon as the SWA opens.Also, as soon as the SWB closes, the I
The output from C1-+ is RIL Da+ S wB
Because it flows, it does not flow in the direction of ICl-z, but since there is a charge in C6, an output is output from the comparator of ICl-2 for a certain period of time determined by the capacitance of 06, so Q3
continues to be ON, but if Q3 is turned OFF after a certain period of time, R
Y.

is turned off and combustion stops. At this time, the output that maintained Q1 was coming out from IC1-s, but as soon as combustion was canceled, the output going to Ql disappeared. However, instead of the output from ICl-s', RY2 is OFF.
As explained for (+-+) <RY2 coil R11
Ql continues to be turned ON by outputting 1D7 R8.

As mentioned above, even during combustion, when the dry firing SWA and BJ are turned on, the high temperature self-maintaining temperature control by the electronic circuit operates normally.

[Other Examples]

(1) FIG. 5 is an example of a circuit used in place of the one shown in FIG.
, use PTC2 and empty firing instruction switch SW
C) It is equipped with SWD and SWE. Thermistor PTC1 is for preheating temperature control, and PTC2 is for dry heating temperature control.

During normal combustion, switch SWc "close" swD "open" SWE
When set to "open", normal preheating and combustion are performed using the PTCl element. When dry firing, swc “closed” SWD “closed”, 5WV
E” closed and PTC? D-element controls the temperature of dry firing S
Since the WE is closed, the self-holding temperature control by the electronic circuit operates normally as described in (2-1) and (2-2), but R
Y2 is not turned on and there is no combustion, resulting in a dry firing state.

(2) FIG. 6 is an example in which FIG. 5 is slightly modified. In Figure 5, swE is connected to the input side of IC, -2, and rcl-2 is "
In Figure 6, instead of swE, Ic5WH is connected to the IC, -2 output side, and even if the output is output from rc, -2, the output flows through SWH to the circuit O side, thereby turning Q3 off. This is to keep it in good condition.

! (3) In FIG. 7, a series circuit of relay RY3 and hot air thermostat 3I is connected between the heater 18 and the power supply terminal in FIG. 3, so that dry heating is automatically performed immediately after combustion is stopped.

The above relay RY3 is a normally closed switch, and the relay RY3 is a normally closed switch.
When current flows through RY3, it opens. The hot air thermostat 31 is a switch that is turned on while the combustion chamber body has heat and the hot air is above a certain temperature.

Before the start of combustion, the RY3 is turned on, but the thermostat 31 is turned off, so no current flows to the heater 18. When the switches SWI and SW2 are turned on, combustion starts as described above, and as the temperature of the combustion chamber body rises, the thermostat 3
1 turns on. However, when switch SWI is on, relay coil/L'RYsK current flows and relay RY3
is off, so no current flows through this series circuit.

Next, when switch SWI is turned off to stop combustion, relay RY3 is turned on, and thermostat 31 is also turned on immediately after combustion, so even though switch SWI is off, heater 18 → thermometer 31 → relay RY, A current flows through the circuit to heat the vaporizer 1. In this case, the thermistor 21 does not operate from 1 to 1, so the temperature of the vaporizer 1 rises above the combustion temperature to about 500° C. and performs dry firing.

During this time, the temperature of the main body of the combustion chamber gradually decreases, and when the temperature of the hot air drops below a certain temperature, the thermostat 31 is turned off, stopping the power supply to the heater 18, and ending the dry firing.

(4) Figure 8 is the same as that shown in Figure 3, in which a series circuit of relay RY and heat-sensitive switch 32 is connected between heater 18 and relay RY, so that dry heating is automatically performed immediately after the start of combustion. It is something.

Relay RY is a switch that turns on and off at the same time as relay RY2. The heat-sensitive switch 32 is provided at a certain distance from the combustion chamber, and is turned off when the temperature exceeds a certain temperature.

Before the start of combustion, the switch 32 is on, but the relay RY is off, so the heater 18 is not energized.

When the switches SWI and SW2 are turned on, the vaporizer 1 is first heated by the previously described operation, and when the vaporizer 1 reaches a certain temperature, the relay RY is turned on. Since relay RY4 is turned on at the same time as relay RY2 is turned on, heater 18 is energized regardless of whether triac TR is on or off. In this way, the heater 18 heats the vaporizer 1 and then performs dry firing.

When the relay RY is turned on, combustion starts due to the operation of the igniter IGN, so the tar removed from the carburetor 1 by dry firing is mixed into the vaporized gas and the nozzle /I/
It is released from 3 and burned. Therefore, compared to the case where the tar component is discharged from the nozzle 3 without being combusted by dry firing, the odor is reduced.

When combustion starts, the surroundings are warmed by the combustion heat, and the surroundings of the heat-sensitive switch 32 are also heated. In this way, the heat-sensitive switch 3
When the temperature around the device 2 reaches a certain temperature (for example, 50° C. to 80° C.), the switch 32 is turned off. For this reason, the heater 18
Continuous energization will be stopped and dry firing will also end. Thereafter, the heater 18 is energized only when the triac TR is energized, and the temperature is controlled by the thermistor 21.

〔effect〕

As described in the paper, according to the present invention, since dry firing is automatically performed after combustion is stopped, tar can be removed at an early stage, and tar clogging can be prevented. It is efficient because dry firing is performed while the vaporizer is heated after combustion.

[Brief explanation of the drawing]

Fig. 1 - Schematic diagram of the vaporizing oil combustor of the present invention, Fig. 2
Figure: Electrical circuit diagram of the vaporizing oil combustor same as above, Figure 3: Circuit diagram of the vaporizing oil combustor, Figure 4: Main part circuit diagram of the combustor of the present invention, Figures 5 to 8: Other FIG. 3 is a circuit diagram of the main part of the embodiment. Code 1: Carburetor body, 2; Vaporization chamber, 4; Gas injection nozzle, 1
7: Vaporization stabilizer, 18: Heater, 24: Burner, S
WA, SWB: Dry firing instruction switch 0 Agent Patent attorney Yoshihiko Fukushi (and 2 others) Figure 2 -

Claims (1)

[Claims] 1. Supplying liquid fuel into a vaporization chamber equipped with a vaporization stabilizer,
In a vaporizing oil combustor in which the vaporized gas is guided to a gas injection nozzle and combusted by a burner, a control means is provided which operates for a predetermined period of time in connection with the vaporization chamber and the vaporization combustion stop operation, and this control means is provided. A vaporizing oil combustor equipped with a dry firing control means that maintains the temperature of the vaporizer higher than the temperature during normal combustion.