JPS6014972B2 - liquid fuel combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device for burning liquid fuel such as kerosene, and particularly relates to an improvement of the fuel supply device portion thereof.

Conventionally, in liquid fuel combustion devices that burn liquid fuels such as kerosene, a constant amount of kerosene has been supplied using an oil volume regulator, but generally a thin fuel supply pipe is used to instantly extinguish the fire. ing.

For this reason, the negative pressure generated by the injected air affects the throttle hole of the oil volume regulator, and the oil volume changes even when supplied by the oil volume regulator due to the influence of the pipe resistance and head of the fuel supply pipe. There is. Specific examples include: m Fluctuations in the power supply voltage change the flow velocity of the air injected from the blower, which changes the amount of kerosene supplied.

■ Of course, when sucking up kerosene using suction power,
Even when supplying fuel by head, if the fuel supply pipe is made thinner, the amount of fuel supplied will change depending on the difference in head between the oil level set by the oil volume regulator and the closing point of the fuel supply pipe.

For example, if the floor is slanted when installing the hem, the head will change, which will change the amount of fuel supplied. {3' The amount of fuel supplied changes depending on the installation condition of the supply and exhaust pipes and changes in the wind pressure in the vaporization chamber due to the wind pressure received during strong winds. If the amount of fuel supplied changes in this way, it will be inconvenient to perform stable combustion, and especially in the case of kerosene vaporization combustion, if the mixing ratio of kerosene and air that results in stable combustion is narrow, the amount of kerosene supplied will change. needs to be kept constant.

The present invention has been made in view of the problems of the conventional devices described above, and is a liquid fuel combustion device in which liquid fuel is supplied from an oil amount regulator to a vaporizing section or a combustion section by a drop through a fuel supply pipe. An intermediate fuel tank opened to the atmosphere is installed with a head difference from the reference oil level of an oil volume regulator, and is connected to the oil volume regulator through a connecting pipe, and is opened and closed from the intermediate fuel tank to the vaporization section or combustion section. The above problem is solved by moving the fuel supply pipe through a valve so that the entrance surface of the fuel supply pipe is at a higher level than the outlet of the intermediate fuel tank, and furthermore, it is possible to detect the oil level height in the intermediate fuel tank. A means is provided to control the rotational speed of the air blowing amount of the blower in response to the oil level height of the intermediate fuel tank, thereby controlling the air necessary for combustion, suppressing fluctuations in the air blowing amount, and achieving stable combustion. It was designed to allow

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to drawings showing embodiments of the present invention.

[Principle of oil amount adjustment of the present invention]

Fig. 1 is a cross-sectional view of a fuel supply device portion for explaining the principle of oil amount adjustment in the present invention, Fig. 2 is a cross-sectional view of another example of an intermediate fuel tank portion in the same device, and Fig. 3 is a further example of another example. This is an example.

In FIG. 1, reference numeral 1 denotes a known oil quantity regulator having an inlet 2 communicating with a kerosene tank and an outlet 4 communicating with an intermediate fuel tank 3, and for introducing kerosene into a constant oil level chamber 5. Valve 6
, a constant curved surface holding mechanism composed of a float 7 and a float village 8, a throttle hole 9 that regulates a constant flow rate to flow out to the outlet 4, and an adjustment punch 10 that adjusts the throttling condition of the throttle hole 9 by moving up and down. It is assembled from the outflow mechanism.

Incidentally, between the adjustment chamber 10 and the outer box 11, a constant oil level chamber 5 and an atmosphere communication hole 12 through which the atmosphere is communicated are opened. In addition, the oil level A-A' of the oil amount regulator 1 and the reference oil level B of the intermediate fuel tank 3
-B has an intermediate fuel tank 3 installed at the lower level so that the head is 1. One side of the intermediate fuel tank 3 is open to the atmosphere, and the inlet 14 of the intermediate fuel tank 3 is connected to the outlet 4 of the oil regulator 1 through a connecting pipe 13.

Further, a fuel supply pipe 16 is connected to the outlet port 15 of the intermediate fuel tank 3 via an on-off valve 18 . The fuel supply pipe 16
The other end is closed at the vaporization section or combustion section. The opening row 7 is located above so that there is a head difference m between the position D-D' of the outlet 15 of the intermediate fuel tank 3 and the position C-C' of the entrance 17 of the fuel supply pipe 16. Reference numeral 19 denotes a nozzle for injecting combustion air, which is provided in the vaporizing section or the combustion section where the closing opening 17 is located.

In the position configured as above, when the on-off valve 1-8 is closed to extinguish a fire, the kerosene level in the intermediate fuel tank 3 is equal to the oil level since the constant oil level chamber 5 of the oil amount regulator 1 is also conveyed to the atmosphere. Adjuster 1
It rises to the same level as A-A', and the head difference becomes larger.

Then, when combustion air is injected from the nozzle 19 and the opening/closing valve 18 is opened, the amount of kerosene determined by the negative pressure generated by the flow velocity of the injected air at the closing port 17 of the fuel supply pipe 16 and the head date flows out from the Sekiguchi 17 and flows out from the nozzle. It becomes a mist with the combustion air of No. 19 and vaporizes. In this way, the amount of kerosene at the time of ignition is larger than the amount of kerosene during normal combustion, so the mixing ratio of kerosene and air is high and the ignitability is good, and when the kerosene is ignited, combustion occurs. At this time, the amount of kerosene flowing out from the closing port 17 under the head rule is larger than the amount supplied from the oil amount regulator 1, so the kerosene level in the intermediate fuel tank 3 decreases and reaches equilibrium at the head h. The head h at equilibrium is determined by the amount of kerosene supplied from the oil amount regulator 1, the amount of kerosene suctioned by the air flow rate from the nozzle 19, and the internal resistance of the fuel supply pipe 16. The level at this time is called the reference oil level. In this way, in the above device, when the amount of suction is large relative to the amount of kerosene supplied, the oil level in the intermediate fuel tank 3 is lower than the C-C' plane and the head h is negative, reaching equilibrium in the form of suction, and the amount of suction increases. If it is small, the head h will reach equilibrium in a large state.

In other words, even if, for example, the power supply voltage increases and the flow velocity of the air injected from the slow blower increases, equilibrium is reached with a head that is balanced with the supply amount from the oil amount regulator 1. In addition, at this time, if the diameter d of the intermediate fuel tank 3 is thick, it will take a long time to reach equilibrium.
The smaller the diameter d, the shorter the time and the better the response. In addition, in the above device, since the upper part of the intermediate fuel tank 3 is closed to the atmosphere, the fuel supply pipe 16 is passed through the throttle hole 1 of the oil amount regulator 1.
2 is not affected by the negative pressure caused by the flow rate of the injection air, and can maintain a constant amount of kerosene supplied from the oil amount regulator 1, and even if the device is installed in an inclined state, the amount of kerosene supplied from the oil amount regulator 1 can be maintained constant. It is supplied with a head according to the amount of oil.

Furthermore, in the above device, when the pressure in the vaporization chamber increases due to the skirting condition of the system exhaust stack or wind pressure during strong winds, the head of the intermediate fuel tank 3 increases by an amount corresponding to the pressure.
Equilibrium is reached when the increase in head cancels out the increase in pressure.

By controlling the kerosene supplied in a fixed amount from the oil quantity regulator 1 in this manner against external fluctuation factors by changing the head of the intermediate fuel tank 3, a fixed amount of kerosene can flow out from the entrance 17 of the fuel supply pipe 16. I can do it.

Note that FIG. 2 shows a modification of the intermediate fuel tank 3, in which the upper part of the tank is made thinner. In this case, by shortening the injection time of the mixed fuel with a high mixing ratio of kerosene and air at the time of ignition, regular combustion can begin immediately after ignition. FIG. 3 shows a case in which the present invention is applied to a liquid fuel combustion device in which kerosene supplied by a head is sprayed and burned by a rotating body. In principle, stable combustion should be possible if the oil supply amount is kept constant by correcting the pressure based on the oil level in the intermediate fuel tank 3, as shown in Fig. 1 above, but in practice, the amount of air blown is If the value fluctuates greatly, it is impossible to follow the fluctuation sufficiently, resulting in unstable combustion.

[Example of the present invention]

Therefore, in the liquid fuel combustion apparatus according to the present invention, a means for detecting the height of the oil level is provided in the intermediate fuel tank 3 as shown in FIG. 4 by utilizing the above principle. The blower that sends combustion air is controlled according to the height of the oil level in the intermediate fuel tank 3, and the detection means includes a float 20 and a float 21 that detect the oil level in the intermediate fuel tank 3. 21
A sliding contact 23 of a variable resistor 22 is connected to the tip of the variable resistor 22.

FIG. 5 is a control circuit diagram of the device. In this basic circuit, a silicon control element (SCR) 24 drives a motor 26 that drives a blower 24.
The SCR 24 controls the power supplied to the SCR 24. Table 1 In this case, as shown in Table 1 above, when the amount of combustion air is large, the resistance of the variable resistance value 22 becomes large, and the electric power supplied to the motor 26 is small. controlled to become

Note that 27 is a semi-fixed resistor R, which is an adjustment resistor for adjusting the amount of air blown to an appropriate amount when the oil level is at the standard level. In this way, in the present invention, fluctuations in the amount of oil supplied due to fluctuations in the amount of air blown are prevented as much as possible by correcting the pressure based on the oil level in the intermediate fuel tank, and changes in the oil level are detected to bring the amount of air blown closer to the appropriate amount. This control not only makes it possible to reduce fluctuations in the amount of air blown, but also maintains a constant oil supply amount with good response even if the amount of air blown changes significantly due to some reason, and quickly returns to the appropriate amount of air blown. , can maintain good combustion.

That is, in the present invention, the oil level in the intermediate fuel tank is used for pressure correction to keep the oil supply amount constant, and is also used as a feedback system to keep the air flow rate of the blower constant. Since the metering tank also serves as a fuel supply pipe, not only is combustion very stable as described above, but the structure is also extremely simple.

〔effect〕

As described above, according to the present invention, a fixed amount of fuel can always flow out from the closed end of the fuel supply pipe and stable combustion can be performed regardless of fluctuations in surrounding conditions.

In addition, an oil level detection means is provided in the intermediate fuel tank, and the blower is controlled according to the oil level height in the intermediate fuel tank to adjust the amount of combustion air blown, so fuel supply can be adjusted based on the liquid level. At the same time, the amount of air blown by the blower can be adjusted, and more stable combustion can be achieved. Furthermore, since the liquid level detection section is shared with the fuel supply pipe, the configuration is simplified. Incidentally, the present invention can also be applied to a device for supplying kerosene in a fixed amount, such as an electromagnetic pump, instead of the oil amount regulator.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a fuel supply device portion for explaining the principle of oil amount adjustment in the present invention, Fig. 2 is a cross-sectional view of another example of an intermediate fuel tank portion in the same device, and Fig. 3 is a further example of another example. FIG. 4 is a sectional view of the fuel supply device portion of the liquid fuel combustion device according to the present invention, FIG. 5 is a control circuit diagram of the same, and FIG.
The figure shows another embodiment of the apparatus of FIG. 1: Oil amount regulator, 3: Intermediate fuel tank, 16: Fuel supply pipe,
17: Open □, 18: Open/close valve, 19: Nozzle, 20: Float, 21: Float pestle, 22: Variable resistance, 25: Blower. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 5

Claims (1)

[Claims] 1. A liquid fuel combustion device in which liquid fuel is supplied from an oil quantity regulator to a vaporizing section or a combustion section through a fuel supply pipe by a drop, and combustion air is blown by a blower, with an intermediate part open to the atmosphere. The fuel tank is installed with a head difference from the reference oil level of the oil volume regulator, and is communicated with the oil volume regulator via a connecting pipe, and the fuel is supplied from the intermediate fuel tank to the vaporization section or combustion section via an on-off valve. In a liquid fuel combustion device in which supply pipes are connected and the opening surface of the fuel supply pipe is located higher than the outlet of the intermediate fuel tank, a nozzle for injecting fuel air blown by the blower is connected to the fuel supply pipe. A liquid fuel combustion device characterized in that an oil level height detecting means is provided in the intermediate fuel tank, and the amount of air blown by the blower is controlled by the output of the detecting means.