JPS593232Y2 - liquid fuel supply device - Google Patents

Description

[Detailed description of the invention] This invention is a liquid fuel combustion device that switches the amount of combustion between high and low levels, and uses liquid fuel to prevent red flame combustion and lifting combustion when switching from high to low, and to stabilize the combustion state. Regarding the supply device.

Usually, a liquid fuel combustion device such as a hot air heating device that pumps up liquid fuel such as petroleum using a pump and supplies it to a combustor for combustion, as shown in Fig. 1, has a combustor A that burns the liquid fuel, It consists of a liquid fuel supply device B that supplies a predetermined amount of liquid fuel to the combustor A, and the combustor A has the following configuration.

That is, a motor 2 is provided in a burner body 1, and an intake fan 4 and a rotary cone 5 through which fuel is dripped are attached to a rotating shaft 3 of the motor 2. Fuel scattering plate6. A stirring plate 7 is provided, and air is sucked into the burner body 1 through the intake fan 4 by the drive of the motor 2, and the sucked air is supplied as primary and secondary air to the vaporization chamber 8 and the combustion chamber 9, and the liquid fuel is The fuel supplied from the supply device B is dripped from the fuel nozzle 10 onto the rotary cone 5, and the fuel is sent to the scattering plate 6.
The scattered fuel is stirred by a stirring plate 7, and combustion gas, which is a mixture of oil and air, is injected from the burner head 11 by the primary air of the suction air, and is combusted in the combustion chamber 9. has been done.

The conventional liquid fuel supply device is shown in FIGS. 1 and 2.
It is configured as shown in the figure.

That is, a pumping pipe 13 through which liquid fuel filled in a fuel tank (not shown) is pumped up by a pump 12 such as an electromagnetic pump is inserted from the bottom of the fuel control body 14 and communicated with the lower part of the pumping part 15 in a watertight manner. Pumping part 1
A constriction part 16 branched from 5 is communicated with an oil pipe 18 connected to the fuel nozzle 10 via a solenoid valve 17,
A pressure transmission pipe 20 communicating with the blowing chamber 19 in the burner body 1 is connected to the oil supply pipe 18 side of the throttle part 16 via an adjustment part 21 formed in the fuel control body 14, and the pressure transmission pipe 20 is communicated with the upper end of the pumping part 15 via a ventilation part 22 formed in the fuel control body 14,
An overflow pipe 23 connected to the fuel tank is configured to communicate with the upper end of the pumping pipe 15.

When fuel is supplied to the combustor A, the liquid fuel pumped up to the pumping part 15 through the pumping pipe 13 by the operation of the pump 12 overflows through the overflow pipe 23, and at the same time, the liquid fuel sent from the pump 12 The intermittent flow is rectified in the constriction section 16,
The liquid fuel becomes a continuous flow without waves and passes through the solenoid valve 1.
7 and the electromagnetic valve 17 opens, the liquid level of the fuel that overflowed in the pumping pipe 13 falls to the liquid level for stable combustion, and the amount of fuel corresponding to this liquid level difference is set as the initial flow rate in the combustor A. ignition is performed.

Thereafter, a stable combustion level is maintained, and normal combustion occurs.

By the way, during the above-mentioned combustion, since the tip of the fuel nozzle 10 is narrowed and the orifice in the electromagnetic valve 17 creates resistance in the flow path, the liquid level in the fuel control body 14 is higher than the constriction part 16. formed in position.

When the flow rate is high, the liquid level is high, and when the flow rate is low, the liquid level is low.

That is, in the case of strong combustion with a large amount of combustion, the liquid level is high, and in the case of weak combustion with a small amount of combustion, the liquid level is low.

Therefore, in the conventional example shown in FIG.
Since the flow cross-sectional area of 6 is constant, the difference H between the liquid level during strong combustion and the liquid level during weak combustion becomes large.

Therefore, when transitioning from strong combustion to weak combustion, a fuel flow rate corresponding to the liquid level difference H is supplied to the combustor A, causing problems such as red-fire combustion and lifting combustion.

This idea takes into account the above points, uses two aperture parts,
The idea is to reduce the difference in liquid level between strong and weak combustion, and to stabilize combustion when switching the combustion amount.Next, this idea will be explained in detail with reference to Figure 1 and the drawings from Figure 3 showing one embodiment. explain.

A pumping pipe 13 through which liquid fuel is pumped by the pump 12 is watertightly connected to the bottom of a pumping part 15 formed vertically from the bottom of the fuel control body 14, and is branched from the bottom of the pumping part 15 with a downward slope. First constriction part 24 (usually φ1.0 to φ1.8 hole) that prevents wave motion
Then, the oil supply pipe 18 connected to the fuel nozzle 10 through the solenoid valve 17 is connected in a watertight manner, and the pressure transmission pipe 20 connected to the air blowing chamber 19 is connected from the oil supply pipe 18 side of the first constriction part 24. The first aperture part 2 communicates with the adjustment part 21 shaped upwardly.
A second constriction part 25 is formed above the pumping part 15 with a downward slope and communicates with the adjustment part 21 , and the fuel control body 14 is formed with a downward slope from the upper end of the pumping part 15 through the adjustment part 21 . A ventilation section 22 is formed that opens on the side surface of the vent section 22, and an overflow pipe 23 is connected to the opening of the ventilation section 22 in a watertight manner.

At this time, during strong combustion, the liquid level in the pumping part 15 is located above the communication point (branch point) of the second throttle part 25 with the pumping part 15, and during weak combustion, the liquid level in the pumping part 15 is The inner diameter of the first throttle part 24 and the diameter of the orifice of the electromagnetic valve 17 are set so that the liquid level is located closer to and lower than the branch point of the second throttle part 25, and the adjustment part 2 during strong combustion is set.
The ventilation section 22 is set so that the difference between the liquid level at No. 1 and the overflowing liquid level corresponds to the optimum initial flow rate.

Note that the opening on the side surface of the fuel control body 14 necessary for forming the second constricted portion 25 is sealed after the formation.

Therefore, when fuel is supplied to the combustor A, when the pump 12 is operated, liquid fuel flows into the fuel control body 14 through the pumping pipe 13, as shown in FIG.
is closed, it overflows from the overflow pipe 23 and returns to the fuel tank.

When the solenoid valve 12 is opened, the initial stage of combustion is usually strong combustion, so as shown in FIG. A quantity of fuel is supplied to the combustor A and ignition takes place without inconveniences such as red flame combustion occurring.

Next, when switching from strong combustion to weak combustion, the fuel supply amount of the pump 12 decreases, as shown in FIG. However, the fuel rectifying section, that is, the first. During strong combustion, the second constriction section 24.25 is connected to the first constriction section 24.25. Compared to the second throttle part 24 and 25, which are formed by two, only the first throttle part 24 is formed during weak combustion.

Therefore, since the flow cross-sectional area of the rectifying section during weak combustion is reduced, the liquid level during weak combustion is stabilized at a lower level close to the communication point of the second throttle section 25.

In other words, the difference H between the liquid level during strong combustion and the liquid level during weak combustion
Since ' is small, the combustion supply to the combustor A due to the liquid level difference H' is reduced at the time of switching, and problems such as red-fire combustion and lifting combustion do not occur.

Further, as shown in FIG. 6, the overflow pipe 23 is communicated with the upper end of the pumping part 15, and the ventilation part 22 is connected as in the conventional case.
is formed with a downward slope from the adjustment part 21 toward the pumping part 15, the difference in liquid level between the initial stage of ignition and the stable state of strong combustion in the adjustment part 21 is L, and since the difference in liquid level is large, A large amount of fuel corresponding to the difference is supplied to the combustor A at the time of ignition, causing problems such as red flame combustion. However, in the embodiment described above, as shown in FIG. Since the overflow pipe 23 is connected to the lower end of the ventilation section 22, the difference in liquid level between the initial stage of ignition and the stable state of strong combustion in the adjustment section 21 is L'. , the liquid level difference L' is optimal and small.

Therefore, at the time of ignition, a large amount of combustion is not supplied to the combustor A, and problems such as red flame combustion do not occur.

As mentioned above, according to the liquid fuel supply device of this invention,
In a liquid fuel combustion device that switches the combustion amount between strong and weak, a pumping pipe through which liquid fuel is pumped up by a pump is connected to a first constriction section and a pumping section connected to an oil supply pipe to a combustor, and communicated with an air blowing chamber. The pressure transmission pipe is connected to the pumping part, and the pressure transmission pipe is connected to the oil sending pipe side of the first throttle part via the adjustment part, and a first pipe is connected above the first throttle part and communicates from the pumping part to the adjustment part. A second throttle part is formed, and the point of communication between the second throttle part and the pumping part is set higher than the point of communication with the adjustment part of the second throttle part, so that during strong combustion, the liquid level in the pumping part is lower than the second throttle part. By positioning the liquid level in the pumping section above the point of communication with the pumping pipe of the second constriction section during weak combustion, and positioning the liquid level in the pumping section below the point of communication with the pumping pipe of the second constriction section during weak combustion, Because there is little difference between the stable liquid level in the pumping pipe and adjustment pipe and the stable liquid level during weak combustion, a large amount of fuel is not supplied to the combustor when switching from strong combustion to weak combustion. , red flame combustion, lifting combustion, and other inconveniences do not occur, and stable combustion can be performed.

Furthermore, by connecting the overflow pipe to the adjustment section in close proximity above the liquid level of the adjustment section during strong combustion, the amount of fuel supplied during ignition can be kept within an appropriate value.
When ignited, stable combustion can be achieved without incomplete combustion such as red flame.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of the liquid fuel combustion device, Figure 2a
This figure is a sectional view of a conventional liquid fuel supply device, the same figure is a plan view of FIG. Figure 5 is a cross-sectional view of each state of the first embodiment. Figure 3 is at overflow, Figure 4 is at stable strong combustion, Figure 5 is at stable weak combustion, and Figure 6 is at stable combustion.
The figure is a sectional view of another embodiment in a state at the time of overflow. 12... pump, 13... pumping pipe, 15... pumping section, 17... solenoid valve, 18... oil pipe, 19...Blast generation chamber, 20...Pressure transmission pipe, 21...
Adjustment section, 23... Overflow pipe, 24...
....First aperture section, 25...Second aperture section, A
... Combustor, B... Liquid fuel supply device.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ In a liquid fuel combustion device that switches the combustion amount between strong and weak levels, a pumping pipe from which liquid fuel is pumped up by a pump is connected to a first constriction section and a pumping section connected to an oil supply pipe to a combustor. A pressure transmission pipe communicating with the draft chamber is connected to the pumping part, and the pressure transmission pipe is connected to the oil pipe side of the first throttle part via an adjustment part, and the pressure transmission pipe is connected to the oil pipe side of the first throttle part through an adjustment part. A second constriction part is formed above the pumping part to communicate with the adjustment part, and a point of communication of the second constriction part with the pumping capital is connected with the adjustment part of the second constriction part. During strong combustion, the liquid level in the pumping part is located above the point of communication with the pumping pipe of the second throttle part, and during weak combustion, the liquid level in the pumping part is set to A liquid fuel supply device that is located below a point of communication between the second constriction portion and the pumping pipe. (2) The liquid fuel supply device according to claim 1, wherein the overflow pipe is connected to the adjustment section in close proximity above the liquid level of the adjustment section during strong combustion.