JPS62261820A - Burner - Google Patents

Abstract

PURPOSE:To prevent oxygen deficiency and dust clogging by providing a temperature sensor on the inner side of an inside flame cylinder close to or in close contact with the inside flame cylinder, and providing control means for reporting or stopping combustion when a signal from the sensor is out of a set range. CONSTITUTION:When an oxygen deficient state is started, a small flame formed in small holes 2 of inside and outside flame cylinders 3 and 4 of a combustion cylinder shifts upward in accordance with the progress of oxygen deficiency, and a lower flame becomes extinct. In accordance with the extinction of the lower flame, the temperature at the lower port of the inside flame cylinder 3 is lowered, and an electromotive force generated by a thermocouple 15 is also lowered. When the temperature reaches a value lower than a set value, a switching mechanism of a reporting switch portion 21 operates and a reporting circuit is turned ON to ring a reporting bell 22. When dust clogging is heavy, a high-temperature gas counterflows up to the tip end of an air passage 12 on the inside flame cylinder side. The balance of the combustion space between the inside and outside flame cylinders is lost by the counterflow of the high-temperature gas, and a large quantity of CO is rapidly produced. When the counterflow thereof is started, the temperature rises abruptly. Consequently, the abrupt rise in the temperature is caught by a temperature sensor 15 to ring the reporting bell similarly to the case of oxygen deficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to the safety of multi-tube household combustors using gas or oil fuels.

Conventional technology As safety devices for multi-tube combustors, seismic fire extinguishing devices against earthquakes and fire extinguishing safety devices for gas combustion are in practical use. Also, regarding oxygen deficiency safety, JP 54-67237
The method shown in is proposed and can be used to deal with oxygen deficiency.

Problems to be Solved by the Invention As mentioned above, safety measures have been considered for the multi-tube combustor, but the current issues are the generation of CO due to lack of oxygen and the generation of CO due to clogging. There are three points: fire and CO generation due to too much combustion.

The present invention is intended to address such problems, and is primarily intended to address oxygen deficiency and dust clogging.

Means for Solving the Problems In order to solve the above problems, the combustor of the present invention is provided with a temperature sensor inside the inner flame cylinder, close to or in close contact with the inner flame cylinder,
In addition, a control means is provided for notifying the user or stopping combustion when the sensor signal is out of a set range.

The present invention uses the configuration described below to detect a decrease in the temperature of the combustion cylinder in the case of oxygen deficiency, detect a sudden rise in the atmospheric temperature in the inner flame cylinder in the case of a blockage, and activate control means such as notification or combustion stop. It is something.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 is a multi-tube type combustion tube, with a large number of small holes 2t, and an inner flame tube 3 with a closed path and an inner flame tube 3 located outside the inner flame tube 3, which also has a large number of small holes 2. The outer flame tube 4 and the outer tube 6, which is located outside the outer flame tube 4 and has a glass tube 5 placed on top thereof, are arranged concentrically and fixed by cross pins 7 to form a combustion section. ing. 8 has one end connected to oil 9 in the oil tank.

The inner and outer flame tubes 3 have a built-in lamp wick 10, and the upper part serves as a fire pan.
．． 4, and place one end of the wick 10 facing between the inner and outer flame tubes. Reference numeral 11 is a passage formed by the inner wall of the tank 8, which sends combustion air to the small hole 2 of the inner flame 83, and together with the inner flame cylinder inner side 12, forms an inner flame cylinder side air passage. Reference numeral 13 denotes a heat shield plate that divides the air passage 12 into two parts, the inner side 12 of the inner flame cylinder and the tank side air passage 11, which shields the radiant heat of the inner flame cylinder 3 from hitting the inner wall of the tank 8, and provides a plurality of air passages for ventilation. A hole 14 is provided. The above constitutes a so-called multi-tube oil nutop.

A thermocouple 15 is attached to the heat shield plate 1a with a mounting bracket 16, and its hot junction 17 is attached close to or in close contact with the outer lower part of the inner flame cylinder, and its cold junction 18 is attached to the heat shield plate 1.
3, is heat-insulated by a cold junction cover 19 formed to avoid direct radiation from the inner flame tube 3 as much as possible, and is installed in a passage for combustion air supplied to the inner flame W13. The temperature sensor is constructed so that it is easily cooled during normal operation.

FIG. 2 shows an example of the control means 2o, which uses a thermocouple 15 as a temperature sensor forming a temperature detection section and a thermocouple 16 that detects the heat generated by the thermocouple 16 for the purpose of reporting abnormal conditions such as oxygen deficiency or dust clogging. A notification switch unit 21 that compares the electromotive force with a set value and turns on electricity if it is outside the set range, a notification P/I/22 connected in series with the notification switch unit 21, and a power source 2.
3 and an operation switch 24. The alarm unit 21 uses a known comparison circuit which compares the input electromotive force signal with a preset numerical value and outputs an on signal when it deviates from this numerical value. It consists of a notification switching mechanism that connects the notification circuit consisting of a power source 23 and an operation switch 24, and a delay circuit that stops the notification circuit for several minutes only when ignition starts. 25 is the combustor receiver 1 [[[L26 is the IJ-do wire of the temperature sensor 15].

In the above configuration, ignition and combustion occur. This ignition operation causes the lamp wick 10 to rise and is ignited by the ignition heater (not shown) K. At the same time, the operation switch 24 is turned on. The flame ignited by the wick 10 heats the lower part of the inner and outer flame tubes 3.4,
Heat is applied to the thermocouple 15 through the lower part of the inner flame cylinder 3 to generate an electromotive force and to send a signal to the notification switch section 21.

During the ignition rise time, the alarm circuit is not activated due to the delay circuit, and a sufficient heat signal is obtained to enter a stable combustion state. At this time, according to experiments, the thermocouple 15 obtains a thermoelectromotive force north of 10 mV.

When the oxygen deficiency condition starts here, the inner and outer flame tubes 3.4 of combustion tube 1
The small flame formed in the small hole 2 moves upward as the oxygen deficiency progresses, and the lower flame disappears. As this disappears, the temperature at the lower part of the inner flame tube 3 decreases, and the electromotive force generated by the thermocouple 150 also decreases, and when it becomes less than the set value, the switching mechanism of the notification switch section 21 operates, turning on the notification circuit and ringing the notification bell 22. . The control means 20 can be configured as a fire extinguishing safety device by using a drive mechanism such as a solenoid for operating the anti-seismic fire extinguishing device instead of the alarm bell.

Next, we will discuss the case where dust clogging occurs.

Dust clogging in this method mostly occurs in the air passage 12 to the inner flame tube 3 side due to the structure and the outer flame tube 4 side being largely open. You can think about it. When dust accumulates in the gap between the saucer 27 and the tank 8 and the air entering the inner flame tube 3 is suppressed, the temperature inside the inner flame tube 3 rises somewhat due to the cooling effect due to the reduction in the amount of air. However, at this level, it cannot be distinguished from an increase due to combustion changes. However, as the supply of air to the inner flame tube 3 side decreases to the point where a change occurs in combustion, the negative pressure inside the inner flame tube a overcomes the draft between the inner and outer flame tubes 3 and 4, causing the arrow in Figure 3 to appear. It has been found that a phenomenon occurs in which combustion gas suddenly flows backward into the inner flame cylinder through the small hole at the bottom of the inner flame cylinder, as shown in . That is, high-temperature gas is sucked into the inner flame cylinder through the lower small hole of the inner flame cylinder and released from above between the inner and outer flame cylinders. It has been found that this backflowing high-temperature gas flows back to the tip of the inner flame cylinder side air passage 12 if there is a lot of dust clogging, and the clogging dust ignites, causing a fire. This backflow upsets the balance of the combustion space between the inner and outer flame tubes, and rapidly generates a large amount of co. The temperature during backflow may reach 700 to 800'CK, and once the backflow begins, the temperature rises rapidly. Therefore, a sudden rise in temperature is detected by the temperature sensor 15, and compared by the notification switch section 21, if the set value is exceeded, the switching mechanism is activated and a warning /L/l- is sounded in the same manner as an oxygen deficiency.

In addition, if an oxygen deficiency occurs due to dust clogging to the extent that the above-mentioned backflow does not occur, CO will be generated quickly and there is a danger. The temperature decreases quickly and can be handled safely.

Effects of the Invention As described above, the present invention finds the optimal variation range through detailed phenomenon analysis of a multi-tube combustor, and by incorporating the optimal existing technology therein, it is possible to at least eliminate oxygen deficiency with a single temperature sensor. We have discovered a new effect that can deal with TL clogging, and provide a combustor with a simple configuration and improved safety.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a combustor showing one embodiment of the present invention;
The figure is a circuit diagram showing the control means for explaining the operation of the combustor, and FIG. 3 is a sectional view showing the backflow state when the combustor is clogged. 2...Small hole, 3...Inner flame tube, 4...
...Outer flame cylinder, 6...Outer cylinder, 12...
Inside of inner flame cylinder, 15...Temperature sensor, 2o...
...control means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure!

Claims (1)

[Claims] An inner flame tube with many small holes drilled in it to close off the road surface, an outer flame tube located outside of this inner flame tube and with many small holes drilled therein, and an outer flame tube located outside of this outer flame tube with many small holes drilled therein. The outer cylinder is configured concentrically, and a temperature sensor is provided inside the inner flame cylinder near or in close contact with the inner flame cylinder, and a control means for receiving a signal from the temperature sensor to notify or stop combustion, A combustor in which the control means is actuated when the temperature sensor signal exceeds a set range.