JPS62238923A - Petroleum combustion unit - Google Patents

Abstract

PURPOSE:To prevent a poisoning accident caused by a carbon monoxide by a method wherein a combination of temperatures near a wick and above a combustion chamber is selected and an alarm is generated or the wick is lowered to turn off a flame under a certain combination. CONSTITUTION:Thermocouples 6 and 6' are provided near a wick 5 and above a combustion chamber 3. A discriminating circuit 22 stores a proper combination of an electromotive force of the thermocouples 6 and 6' and if the combination is not a proper one, it energizes a relay 23, operates a switch 24, descends the wick 5 and turns off a flame. If a proper range of the discriminating circuit 22 is set, it may always be used under a safe condition. In turn, if tar is accumulated at an extremity end of the wick 5 to decrease a sucking capability or if an exposed height of the wick 5 into a combustion chamber 3 is lowered and a concentration oxygen is decreased, an abnormal combustion is generated within such a range as a temperature near the wick shows a proper value. In this case, since a temperature of the thermocouple 6' is decreased, this state is judged by this electromotive force and then an alarm is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a safety device for a wick-type oil burner widely used in oil stoves, oil stoves, and the like.

BACKGROUND OF THE INVENTION Conventional safety devices for oil combustors using lamp wicks detect fires using pendulums or the like to detect vibrations and lower the wick in the event of an earthquake or fall to extinguish the fire. However, regarding the safety of the toxic carbon monoxide contained in exhaust gas, there is a means to display the appropriate range of the exposed height of the lamp wick using a knob, etc., and a mechanism that prevents the exposed height of the lamp wick from falling below the appropriate lower limit position. A configuration is used.

Problems to be Solved by the Invention However, with the above configuration, incomplete combustion due to lack of oxygen occurs when burning for a long time in a narrow room or a room with good airtightness, and tar accumulates on the wick and causes the wick to burn out. It is said that when the capillary tube is blocked and the amount of combustion is reduced, or when the exposed height of the wick is lower than the appropriate range, abnormal combustion due to excess air cannot be detected and dangerous carbon monoxide is generated. There was a problem.

Means for Solving the Problems In order to solve the above problems, the present invention includes temperature detection means for detecting temperature in the vicinity of the lamp wick and above the combustion chamber, and selects each temperature combination. It is designed to give a warning or to lower the wick to extinguish the fire.

The temperature near the exposed part of the wick in a working wick type oil combustor changes depending on the oxygen concentration in the air supplied to the combustion section, and as the oxygen concentration decreases, the temperature also decreases.

Furthermore, the temperature tends to increase when tar accumulates in the wick and the capillary tubes of the wick are clogged, reducing the suction capacity, or when the exposed height of the wick is lowered to suppress the evaporation area. On the other hand, the temperature above the combustion chamber decreases because as the oxygen concentration decreases, the temperature near the wick decreases and the amount of vaporization decreases. Furthermore, when tar accumulates in the lamp wick and the capillary tubes are blocked, the amount of vaporization decreases, resulting in a decrease in energy consumption. Therefore, in a method that detects the temperature only in the vicinity of the lamp wick, when conditions are compounded, such as when tar accumulates in the lamp wick and oxygen concentration decreases, it is difficult to detect abnormal conditions because there is little change in temperature. According to the configuration of the present invention, even when the above-mentioned conditions are combined, the temperature change near the lamp wick is small, but a drop in temperature above the combustion chamber is detected, and an electric circuit alerts the danger with a warning sound or a warning light. Poisoning accidents caused by carbon monoxide, etc. can be avoided by extinguishing the fire.

Example Embodiments of the present invention will be described below based on the accompanying drawings.

In Fig. 1, 1 is an inner flame tube with many small holes, 2 is an outer flame tube with many small holes, and the gap between the inner flame tube 1 and the outer flame tube 2 forms a combustion chamber 3. do. Reference numeral 4 denotes a wick outer tube that guides the outer peripheral side of the lamp wick 5 and places the outer flame tube 2 on top; 6 is a thermocouple that is fixed to the wick outer tube 4 and has a heat-sensitive part facing the combustion chamber 3; 6'
is a thermocouple installed above the combustion chamber 3. Numeral 5 is a lamp wick whose tip is exposed to the combustion chamber 3 during combustion, and whose lower end is immersed in fuel 8 in a fuel tank 7 to supply fuel by capillary action. Reference numeral 9 denotes a rack 1 connected to a pinion 10 and the lamp wick 5 via a wick adjustment shaft 10 connected with a knob that moves the lamp wick 5 up and down.
2 to raise and lower the lamp wick 5.

Reference numeral 13 denotes a wick spring that biases the wick 5 in the downward direction. In FIG. 2, 14 is a fire extinguishing gear connected to the core adjustment shaft 10, 15 is a movable lever that controls the rotation of the fire extinguishing gear, 16 is a vibration sensor that senses vibrations and operates the movable lever 15, and 17 is movable. A board 18 that holds the lever 15 is a solenoid that operates the vibration sensor 16 by an electric signal from a control circuit.

In FIG. 3, 19 is a timer circuit that operates as the lamp wick 5 rises and becomes open after a certain period of time, 2° is a DC power source such as a dry battery, 21 is an amplifier circuit that amplifies the output of the thermocouple 6, and 2
1 is an amplifier circuit that amplifies the output of the thermocouple 6'; 22 is a determination circuit that stores the proper combination, determines the difference with the input, and energizes the relay 23 when the combination is outside the proper combination; and 23 operates the switch 24. Relay 25 is a capacitor.

In the above configuration, when the knob 9 is rotated, the pinion 11 and the rack 12 cause the wick 5 to rise while accumulating the wick spring 13 so that the tip thereof faces into the combustion chamber 3. On the other hand, the extinguishing gear 14 interlocked with the knob 9 is prevented from reversing by the movable lever 15, and the wick spring 13 is held in a charged state.

Further, the timer switch 19 is started by the power switch 26. When the tip of the lamp wick 5 is ignited, combustion begins, but until the temperature of the thermocouples 6 and 6' reaches a stable state, the voltage of the DC power supply 20 is substituted for the electromotive force of the thermocouples 6 and 6' by the timer switch 19. Prevent malfunction. When the temperature of the thermocouples 6, 6' reaches a stable state, the timer switch 19 is opened, and the electromotive force of the thermocouples 6, 6' is amplified by the amplifier circuits 21 and 21' and reaches the determination circuit 22. If, after the timer switch 19 is activated, the electromotive force of the thermocouple is out of the proper combination stored in the determination circuit, it is an abnormal state, so the relay 23 is energized and the switch 24 is activated, thereby releasing the energy stored in the capacitor 25. Activate solenoid 1 and knock down seismic element 16. When the seismic element 16 falls, the movable lever 15 moves upward, releasing the hold on the extinguishing gear 14, and the wick 5 is lowered by the heat-stored wick spring 13 to extinguish the fire.

During combustion, when the concentration of oxygen supplied to the combustion section decreases, the fuel vaporized from the tip of the wick 5 becomes difficult to burn due to lack of oxygen, and the combustion position gradually moves upwards in the combustion chamber 3.

Therefore, the temperatures of the lower part of the combustion chamber 5, the outer tube 4, the tip of the wick 5, and the thermocouple 6 gradually decrease. This decrease in temperature is approximately proportional to the decrease in oxygen concentration. In addition, if tar accumulates at the tip of the wick 5 and the fuel suction capacity is reduced, or if the exposed height of the wick 5 into the combustion chamber a is low and the vaporization area becomes small, the amount of fuel vaporized decreases, resulting in excess air. As a result, combustion becomes active in the lower part of the combustion chamber 3, and the temperature of the rotating part rises.

Figure 4 shows the relationship between the oxygen concentration, CO concentration, and core/outer cylinder temperature in the example. When the CO concentration is detected below 20 ppm, which is considered safe, the temperature is approximately 120°C, and the oxygen concentration at that time is approximately It becomes 17.5%. Therefore, the lower limit of the appropriate range in the determination circuit is the electromotive force of the thermocouple at 120°C.

Figure 5 shows the relationship between the combustion amount, C09 degrees, and wick outer cylinder temperature by changing the exposed height of the wick, but in the same way, 005 degrees is 20 ppm.
When the temperature is detected below, the temperature is approximately 340°C, and the upper limit of the appropriate range is the electromotive force at 340'C.

As explained above, the appropriate range in the judgment circuit is 12
If the temperature is set between 0°C and 340°C, the amount of CO generated due to insufficient oxygen and insufficient combustion amount will be 20 ppm or less, which means that it can be used safely at all times.

On the other hand, if tar accumulates at the tip of the lamp wick 5 and the fuel suction capacity is reduced, or if the lamp wick 5 is exposed to the combustion chamber 3 at a low height and the vaporization area is reduced, the amount of vaporization is small. And if the oxygen concentration decreases, the temperature near the wick will drop to 120'C~
Abnormal combustion occurs within the range of 340'C. In this case, since the temperature of the thermocouple 6' above the combustion chamber has decreased, a warning is issued based on this electromotive force.

Examples of combinations of electromotive force and combustion state of such thermocouples are shown in the table.

By storing combinations of electromotive forces of the thermocouples 6 and 6' in the determination circuit 22, a warning can be issued when combinations 2 to 9 occur.

In addition, in the embodiment, a configuration was described in which an abnormality is detected and the wick is lowered to extinguish the light, but it is also possible to easily display a warning sound or a warning light by installing a warning buzzer or lamp in place of the relay 23. .

Detailed explanation of the invention Thus, according to the oil combustor of the present invention, (1) Abnormal combustion due to lack of oxygen (2) Abnormal combustion due to tar accumulation in the lamp wick (3) Abnormal combustion due to use outside the appropriate range of combustion amount Combustion (4) It is possible to provide a combustor that can detect abnormal combustion due to a combination of the conditions listed in (g) and issue a warning or extinguish the fire before a large amount of toxic components such as carbon monoxide is generated, allowing it to be used in a safe condition at all times.

[Brief explanation of drawings]

FIG. 1 shows a main part 1 of an oil combustor according to an embodiment of the present invention.
...Inner flame tube, 2...Outer flame tube, 3...
Combustion chamber, 6... thermocouple, 6'... thermocouple. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
11 Mon Enshō 2-11 Gai Moxibustion Business, 3-11 Sakai U's previous room. Figure 1 66'-Perspective pair Figure 2 Figure 3

Claims (4)

[Claims] (1) A combustion chamber consisting of an inner flame tube with many small holes and an outer flame tube with many small holes, a lamp wick whose upper end is located in the combustion chamber during combustion, and the vicinity of the lamp wick and the combustion chamber. An oil combustor comprising a thermocouple above the thermocouple, a circuit that detects the electromotive force of the thermocouple, and generates a warning when a certain combination of electromotive forces occurs. (2) The oil combustor according to claim 1, wherein the warning is sound or light. (3) The oil burner according to claim 1, wherein the warning causes the wick to be lowered and extinguished. (4) The oil combustor according to claim 3, which operates a vibration fire extinguishing device by a combination of electromotive forces.