JPS63105325A - Petroleum burner - Google Patents

Abstract

PURPOSE:To permit the detection of the condition of imperfect combustion with high accuracy, by a method wherein a temperature detecting element, whose outer periphery is covered by a cover, is attached to a position closer to a combustion unit than a reflecting plate and a detecting circuit, detecting the condition of imperfect combustion by the change of the output of the temperature detecting element, is equipped in the title pertroleum burner. CONSTITUTION:A temperature detecting element 14, connected to a detecting circuit 18, detecting the condition of combustion, is attached by projecting it to the direction of a combustion unit 8 than a reflecting plate 13 opposing to a red-hot part of an outer flame tube 10. Accordingly, the sensibility of the temperature detecting element 14 is improved when a combustion condition becomes the condition of lacking oxygen or minute combustion. A cover 16, covering the temperature detecting element 14, is provided to facilitate the collection of heat of a combustion unit 8 and reduce the variation of the detecting temperature of the temperature detecting unit 14 under a constant amount of combustion while a detecting temperature difference between the maximum combustion condition and the minute combustion condition, decided as abnormal, may be enlarged whereby the detecting level of an abnormal combustion condition may be stabilized. On the other hand, the affection of external phenomenon, such as the blowing of air against a main body 1 or the like, may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an incomplete combustion detection device for oil combustors, particularly wick type oil combustors.

BACKGROUND OF THE INVENTION When an open-air oil combustion appliance is burned in a tightly closed, poorly ventilated room, the oxygen concentration decreases over time. When there is a lack of oxygen, incomplete combustion occurs,
The resulting unpleasant odor and toxic carbon monoxide may cause poisoning accidents.

In addition, in the case of a wick-type oil combustor, if the exposed height of the wick is lowered to reduce the amount of combustion, incomplete combustion will occur in the combustion section, which tends to increase carbon oxides, which may cause human health. This is a very unfavorable situation for the

Therefore, in order to detect incomplete combustion, in a conventional oil combustor, a temperature detection element 33 is provided near the fuel vaporization part 32 of the combustion part 31, as shown in FIG. The output was used to detect incomplete combustion.

Problems to be Solved by the Invention However, with the above configuration, incomplete combustion due to oxygen deficiency can be detected, but incomplete combustion caused by changing the exposed height of the wick 34 and reducing the amount of combustion can be detected. Condition is not detectable.

In other words, in the case of a wick-type oil combustor that naturally vaporizes liquid fuel, the amount of combustion due to lack of oxygen decreases, but at that time, the combustion position of the combustion flame shifts upward. Therefore, the fuel vaporization section 3
The temperature near 2 tends to decrease. Next, when the exposed height of the lamp wick 34 is lowered to reduce the amount of combustion, the combustion flame position moves near the lamp wick 34, that is, near the fuel vaporization section 32, and the temperature near the fuel vaporization section 32 tends to rise. It is in.

In other words, the amount of combustion remains the same in both cases, but the behavior of the temperature near the fuel vaporization section 32 is completely opposite.
Both incomplete combustion conditions are difficult to detect.

In addition, in order to adjust the exposed height of the lamp wick 34 and adjust the combustion amount within a range that does not deteriorate the exhaust gas characteristics, a temperature detection element 33 is installed near the fuel vaporization section 32, although it is a normal oil combustor. When trying to detect the output at a constant level, there is a so-called maximum combustion state in which the exposed height of the lamp wick 34 is maximized, and a so-called minimum combustion state in which the exposed height of the lamp wick 34 is lowered to a level that does not deteriorate the exhaust gas characteristics. In the combustion state, there is a problem in that the oxygen concentration that determines oxygen deficiency varies greatly.

FIG. 8 shows the oxygen concentration and the temperature near the fuel vaporization section 32 in the maximum and minimum combustion states. In the maximum combustion state, the temperature during stable combustion is originally low, and when oxygen is insufficient, Since the oxygen concentration decreases, detection is made while the oxygen concentration is high again. Conversely, in the minimum combustion state, the temperature during stable combustion is high, and if oxygen is insufficient, detection is made after the oxygen concentration has decreased considerably. As a result, there is a considerable difference between the incomplete combustion state and the detected state, which poses a major problem in practical use.

In order to solve this problem, it is necessary to change the detection level according to the amount of combustion, but it is difficult to judge the amount of combustion with ordinary wick-type oil combustors.

In addition, when the combustion section is exposed to wind, the combustion flame backfires inside the combustion section 31, which heats up and damages the temperature detection element 33.

The present invention is intended to solve these conventional problems, and it is an object of the present invention to accurately detect an incomplete combustion state caused by a lack of acid or a decrease in combustion amount due to a change in the wick exposure height.

Means for Solving the Problems In order to solve the above-mentioned problems, the oil combustor of the present invention is provided with a combustion part and a glossy reflector plate provided on the main body to cover the combustion part. A temperature detection element covered with a cover is mounted closer to the combustion part than the reflection plate, and a detection circuit is provided to detect an incomplete combustion state based on a change in the output of the temperature detection element.

Effect of the Invention With the above-described configuration, the present invention allows the oil combustor to burn in a highly sealed room, and when oxygen is insufficient, the decrease in the amount of combustion in the combustion section is treated as a decrease in the temperature of the temperature detection element, and the detection circuit to detect incomplete combustion.

In addition, in a wick-type oil combustor, when the exposed height of the wick is reduced to reduce the amount of combustion, the detection circuit similarly detects an incomplete combustion state as the temperature of the temperature detection element decreases. I will do it.

At this time, by providing a cover that covers the outer periphery of the temperature detection element, the temperature of the combustion section can be easily collected, and changes in the temperature of the combustion section can be detected with high accuracy. This also eliminates the influence of external factors such as wind, and prevents the temperature detection element from being damaged.

Further, by locating the temperature detection element closer to the combustion part than the reflection plate, it is possible to reduce variations in the amount of combustion.

As described above, it becomes possible to reliably detect changes in the amount of combustion, resulting in an oil combustor equipped with a highly reliable incomplete combustion detection device with little variation.

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

In Figures 1 and 2, 1 is the main body of the oil combustor, 2 is the fuel tank, 3 is the wick that sucks up the fuel in the fuel tank 2 and vaporizes it, and 4 is the wick adjustment that adjusts the exposed height of the wick 3. Knob 5 is a power switch that turns on and off in conjunction with the adjustable moxibustion knob.
Raise the wick to turn it on, lower it to turn it off.

6 is the inner core guide tube located inside the lamp wick 3, and 7 is the lamp wick 3.
The outer core guide tube 8 located on the outside of ' is a combustion section placed on the inner and outer core guide tubes 6 and 7, and the combustion section 8 has an outer tube 9, an outer flame tube 10, and an inner flame tube concentric with each other. Flame tube 11, heat ray transmission tube 12
It consists of 13 is the main body 1 so as to cover the combustion part 6.
It is a reflective plate provided in the main body 1, and has gloss so as to reflect the heat rays from the combustion section toward the front opening of the main body 1. 14 is a temperature detection element such as a thermistor that is provided to protrude in the direction of the combustion section 8 from the reflection plate 13, and detects the normal combustion flame 8a generated in the horizontal position of the heat ray transmitting tube 12 of the combustion section 8, that is, the combustion section 8. It is installed lower than the

Reference numeral 15 denotes a pedestal for the temperature detection element, which has gloss so as to reflect the heat rays of the combustion section 8. Reference numeral 16 denotes a cylindrical cover provided on the outside of the temperature detection element 14, and is designed to protect the temperature detection element. 17 is a lead wire that sends changes in the output of the temperature detection element 14 to the detection circuit 1B.

The detection circuit 18 is constructed as shown in FIG.

In FIG. 3, the temperature detection element is 14, 19 is a power supply, 5 is a power switch that can be turned on and off in conjunction with the wick adjustment knob 4 that controls the wick height of the lamp wick 3, a resistor 20, and a capacitor 21 are a CR timer. It consists of 22 is its CR
This is a counter that counts the output waveform of the timer, and outputs H1 level until the set count, and outputs Lo level after the set count. 23 is a transistor connected to the counter 22. 24 and 25 are resistors connected in series and set a reference voltage. 26 is a comparator which has an output due to a temperature change of the temperature detection element 14 as an inverting input, and a reference voltage from a resistor 24.25 as a non-inverting input. 27 is a buzzer that notifies the alarm;
8 is a transistor whose base is connected to transistor 2
3, the output of the comparator 26 is used as the base input, and the buzzer 27 is operated.

The operation of the oil combustor configured as described above will be described below, assuming that the temperature detection element 14 is a thermistor.

First, by rotating the wick adjustment knob 4, the lamp wick 3 protrudes above the inner and outer core guide cylinders 6.7, and by igniting this protruding lamp wick 3, the inner flame cylinder 1 constituting the combustion section 8
1 and the outer flame tube 1o, the primary combustion chamber 29 and the secondary combustion chamber 29
Combustion continues in the secondary combustion chamber 30, which is the space above. At this time, the heat rays from the red-hot outer flame tube 10 pass through the heat ray transmission tube 12 and are reflected by the reflection plate 13 to warm the user located in front of the main body 1.

At this time, the detection circuit 18 turns on the power switch 5 in conjunction with the core adjustment knob 4, and the counter 22 outputs the Hl level for a certain period of time (usually about 30 minutes until combustion stabilizes). . As a result, the transistor 23 is turned on and the transistor 28 is turned off, so that the operation of the buzzer 27 is suppressed.

Next, when the set count of the counter 22 is completed, the Lo level is output and the transistor 23 is turned off. However, during that time, the temperature of the temperature detection element 14 is maintained at a high temperature by the hot wire of the red-hot outer flame cylinder 10, and the output of the temperature detection element 14 becomes higher than the reference voltage due to the resistor 24.25. There is. That is, in the comparator 26, the inverting input is higher than the non-inverting input, and the output of the comparator 26 becomes Lo, so the transistor 28 is turned off and the operation of the buzzer is suppressed.

When a room is heated by combustion under these conditions, if an oxygen-deficient state begins to occur, the combustion ash capacity of the combustion flame formed in the secondary combustion chamber 29 will decline, and the amount of heat given to the lamp wick 3 will decrease. If the amount of fuel vaporized from the lamp wick 3 gradually decreases, the amount of fuel consumed will also decrease. As the fuel consumption decreases in this manner, the red-hot state of the outer flame tube 10, which has been red-hot, becomes worse. Therefore,
The temperature sensed by the temperature detection element 14 attached to the reflection plate 13 decreases, and the resistance of the temperature detection element 14 increases. Therefore, the output from the temperature detection element 14 is lower than the reference voltage, and the non-inverting input of the comparator 26 is higher than the inverting input.

That is, since the output of the comparator 26 becomes Hl, the transistor 28 is turned on and the buzzer 27 is activated.

The operation of the buzzer 27 prompts the user to ventilate.

When the room is ventilated according to the operation of the buzzer 27, the oxygen deficiency state is recovered and the amount of combustion increases, and the red-hot state of the outer flame tube 10 also improves, and the temperature of the temperature detection element 14 also rises. The output of the comparator 26 is held at Lo again and the buzzer 27 is stopped.

Next, when the exposure height of the lamp wick 2 is lowered using the wick adjustment knob 4 to reduce the amount of combustion, the flame generated in the secondary combustion chamber 30 disappears and combustion occurs in the secondary combustion chamber 29. The remaining combustion in the secondary combustion chamber 29 becomes unburned gas, that is, carbon monoxide, and is discharged. In other words, the exhaust gas characteristics tend to deteriorate. At this time too,
As the combustion amount decreases as in the case of oxygen deficiency, the red-hot condition of the outer flame cylinder 10 worsens, the temperature detected by the temperature detection element 13 decreases, and the output of the comparator 26 becomes Hl,
Buzzer 27 is activated. This notifies the user of the incomplete combustion state.

Using the wick adjustment knob 4, lower the lamp wick 2 beyond the apex of the inner and outer wick guides 6 and 7. That is, when the fire extinguishing operation is performed, the power switch 5 is turned off in conjunction with the wick adjustment knob 4, so the operation of the buzzer 27 is of course stopped.

In this way, increasing the accuracy of the temperature sensed by the temperature detection element 14 when oxygen is deficient or the amount of combustion is reduced is most practical from the standpoint of safety and mass production. For this reason, the inventor believes that it is necessary to consider the following points.

■ Stabilization of the minute amount of combustion that is judged as abnormal combustion ■ Reduction of the difference in oxygen concentration between the maximum combustion state and the minimum combustion state at the oxygen deficiency detection level.

■ From the viewpoint of durability, consideration should be given to reducing the red-hot temperature of the combustion section 8, especially of the outer flame tube 10, due to aging.

■ Eliminate the influence of external factors (especially when exposed to wind).

Therefore, in order to reduce these effects, the temperature detection element 14 is attached to the reflector plate 13 below the combustion part 8 and the flame position, that is, facing the red-hot part of the outer flame tube 10. The pedestal 15 of the temperature detection element 14 is made to project in the direction of the part 8, and the pedestal 15 of the temperature detection element 14 is made glossy, and a force bar 16 is provided around the temperature detection element 14.

First, by positioning the temperature detection element 14 below the flame of the combustion section 8, that is, the secondary combustion chamber 30, and attaching it to the reflector plate 13 so as to face the outer flame tube 10, it is possible to detect an oxygen-deficient state or Sensitivity has been improved when a slight combustion condition occurs. As described above, the incandescent brightness of the outer flame tube 10 decreases in the case of an oxygen deficiency state or a slight combustion state, and in order to realistically detect this, the above-mentioned position is desirable.

Next, a cover 16 covering the temperature detection element 14 is provided as shown in FIG. This makes it easier to collect the temperature of the combustion part 8, reduces the variation in the temperature detected by the temperature detection element 14 when the combustion amount is constant, and also reduces the temperature in the maximum combustion state.
It becomes possible to increase the detected temperature difference for a minute combustion state that is determined to be abnormal, and the detection level of an abnormal combustion state becomes stable. Furthermore, by covering the outer periphery of the temperature detection element 14 with the cover 16, it is possible to reduce the influence of external factors such as wind hitting the main body 1. This is because there is less heat loss and less influence than when the temperature detection element 14 is exposed. Furthermore, when the main body 1 falls down, the combustion section 8 falls down and the temperature detection element 14
This also prevents damage from being hit.

Further, the temperature detection element 14 is made to protrude beyond the reflection plate 13,
Even if it is close to the combustion part 8, the temperature detection element 14
This contributes to the stabilization of the detected temperature and the abnormal combustion detection level. If the temperature detection element 14 is placed too far away from the combustion section 8, the temperature difference between the maximum combustion state and the slight combustion state, or the steady combustion state and the oxygen deficient state will decrease, which is not preferable considering the dispersion of the abnormal combustion detection level. On the other hand, if they are brought too close together, the above-mentioned temperature difference will widen, but there will be a tendency for the detection levels of the slight combustion state and the oxygen deficiency state to deviate. In experiments, it was found that the gap between the temperature detection element 14 and the heat ray transmitting tube 12 of the combustion section 8 was approximately 12 to 20 mm. In a typical oil combustor, the gap between the combustion part 8 and the reflection plate 13 is 20a or more. This is to prevent the heat rays reflected by the reflector 13 from being fed back to the combustion section 8 and the amount of combustion to become extremely large. Therefore, the temperature detection element 14 needs to protrude beyond the reflector 13. It becomes.

In addition, by making the pedestal 15 of the temperature detection element 14 glossy like the reflection plate 13, the part of the heat rays from the combustion section 8 that is sent directly to the temperature detection element 14 is reflected at the pedestal 15 part. Since the amounts sent by the fuel are combined, it becomes possible to widen the temperature difference between the steady combustion state and the oxygen deficient state, or between the maximum combustion state and the slight combustion state, and the detection level of the abnormal combustion state becomes stable.

By combining these, it is possible to reduce the oxygen concentration at the oxygen deficiency detection level in the maximum combustion state and the minimum combustion state. When oxygen deficiency occurs from the maximum combustion state, the temperature sensed by the temperature detection element 14 remains higher than when oxygen deficiency occurs from the minimum combustion state. Therefore, if the level at which oxygen deficiency is detected is set constant, an oxygen deficiency from the maximum combustion state tends to cause the engine to run out late, and conversely, an oxygen deficiency from the minimum combustion state tends to cause the engine to run out early. However, because the above-mentioned configuration makes it easier to collect the heat rays from the combustion section 8, the difference in the detected temperature between the maximum combustion state and the minimum combustion state is not so large, and the difference between the maximum combustion state and the abnormal combustion state is small. There tends to be a large difference in the slight combustion state to be judged. FIG. 5 shows the relationship between the amount of heat generated and the temperature detection element 14, and it can be seen that this is the case. Therefore, even if oxygen deficiency occurs due to each condition, there will not be a large difference in the oxygen concentration level at which abnormal combustion is detected. FIG. 6 shows the sensed temperature in the oxygen deficient state from each combustion state.

In addition, the red heat temperature of the outer flame tube 10 is low due to aging.
Since the sensor also makes it easier to collect heat, the sensed temperature decreases somewhat, but it is not a big problem. Figures 5 and 6 show the characteristics when the combustion section is used after 2000 hours of combustion.

Taking these into consideration, if the resistance 24 and 25 are set so that when the temperature sensed by the temperature detection element 14 reaches 110°C, an abnormal combustion state is detected, as shown in Figs. 5 and 6, the following results will be obtained. Therefore, it becomes possible to detect holes with high accuracy.

Accordingly, it is possible to fully satisfy the four points to be considered mentioned above.

Effects of the Invention As described above, the oil combustor of the present invention can accurately detect both a slight combustion state that causes deterioration of exhaust gas characteristics and an incomplete combustion state that is an oxygen-deficient state that occurs when used in a closed room. In addition, aging,
It is possible to provide a safe oil combustor with excellent safety and durability that minimizes the influence of external factors.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an oil combustor according to an embodiment of the present invention, FIG. 2 is a perspective view of the same, and FIG. 3 is a detection circuit diagram of the oil combustor.
Fig. 4 is an enlarged perspective view of the same main part, Fig. 5 is a graph showing the relationship between the combustion amount and the temperature detected by the temperature detection element in one embodiment of the present invention, and Fig. 6 is a graph showing the relationship between the oxygen concentration and the temperature detection element. FIG. 7 is a graph showing the relationship between detected temperatures. FIG. 7 is a longitudinal cross-sectional view of a conventional oil combustor. FIG. 8 is a graph showing the relationship between oxygen concentration and temperature detection element in the conventional example. 8... Combustion part, 13... Reflection plate, 14
...Temperature detection element, 16...Cover,
18...River detection circuit. Name of agent: Patent attorney Toshio Nakao, 1 person, 8-
Gari Gate■ 15-Color diameter 8-Kiryuya 13-and jlFi version f4-Ontomo examiner snoring otsu-Cover Fig. 2 Fig. 3 Lri Fig. 4 Fig. 5 Prisoner Fig. 6 Fig. 7

Claims (2)

[Claims] (1) A combustion section, a glossy reflector provided on the main body to cover the combustion section, and a temperature detection element positioned closer to the combustion section than the reflector and whose outer periphery is covered with a cover. and a detection circuit that detects an incomplete combustion state based on a change in the output of this temperature detection element. (2) The oil combustor according to claim 1, wherein the pedestal portion of the temperature detection element has a special gloss.