JPS599138Y2 - fuel atomization device - Google Patents

Description

[Detailed description of the invention] This invention relates to a device that uses an ultrasonic vibrator to atomize fuel supplied to an oil combustion device or mixed fuel supplied to an internal combustion engine, and is not affected by changes in ambient temperature. The present invention relates to a fuel atomization device that controls a desired amount of atomization to be constant.

Conventionally, an idea has been proposed (Utility Model Publication No. 52-27295) in which the atomization capacity is improved by controlling the temperature of the atomization tank using a heating means having a temperature control mechanism in the fuel mist sales tank, but the problem is that The points will be explained with drawings.

FIG. 1 is an explanatory diagram of a conventional example, which is an apparatus that atomizes a portion of fuel supplied to an internal combustion engine using an ultrasonic vibrator.

In the figure, fuel is supplied to the atomization tank 1 from a fuel supply passage (not shown), and a heating chamber 2 is defined on the circumferential surface to heat the fuel. The exhaust gases are communicated in parallel with each other through exhaust passages 5a and 5b, and a portion of the exhaust gas is introduced thereinto.

Exhaust gas whose flow rate is controlled by the flow control valve 6 flows into the heating chamber 2, and the fuel is heated to an appropriate state without igniting the fuel.

Since the fuel atomization tank is heated in this manner, the atomization of the fuel that has a low vaporization temperature and is easy to evaporate progresses, and the fuel that has a high vaporization temperature accumulates.

Furthermore, fuel tar builds up on the walls of the heater, making the heater dirty and reducing heating efficiency.In order to shorten preheating time, increasing the temperature of the heater may promote fuel tar formation or atomization. Overheating of the mixed fuel causes the combustion speed to become particularly high, resulting in disadvantages such as a tendency for backfire to occur in the combustion device.

Therefore, it has been proposed to provide a coupling liquid tank for acoustic coupling at the bottom of the fuel atomization tank that generates the flammable mixture, and to arrange an ultrasonic vibrator at the bottom of this coupling liquid tank. In such a device, as shown in Figure 3, if the temperature of the coupling liquid changes due to changes in the outside temperature, the amount of fuel atomized will also change significantly, and the supply of atomized fuel to the combustion section will be affected. The disadvantage is that combustion becomes unstable if the value changes.

This invention was made to eliminate the above-mentioned drawbacks.
This is a fuel atomization device that controls the desired amount of atomization to be constant regardless of the ambient temperature.

An embodiment of the present invention will be described below based on the drawings.

FIG. 2 is a sectional view of a fuel atomization device showing an embodiment of the present invention.

In the figure, 7 is a fuel atomization tank containing a liquid fuel 8 inside, a hemispherical coupling liquid tank 10 containing an acoustic coupling liquid 9, and a polyester film having low thermal conductivity and high heat resistance. It is divided by a diaphragm 11.

An ultrasonic vibrator 11 is disposed at the bottom of the coupled liquid tank 10 and is driven by an oscillator 12 via a power supply line 13 .

Reference numeral 14 denotes a heater embedded in the binding liquid tank 10, and is capable of maintaining the binding liquid 9 at a constant desired temperature using a temperature sensor 15 and a temperature control circuit 16.

17 is the upper surface of the combined liquid tank 10 and the hemispherical diaphragm 1;
1, and 18 is a heat insulating material sandwiched between the fuel atomization tank 7 and the combined liquid tank 10.

Reference numeral 19 denotes an atomizing tube installed concentrically with the fuel atomizing tank 7, and the atomized liquid fuel fine particles 20 and the fuel atomizing tank 7 are
A blower 2 installed in an intake cylinder 21 that is open at one end.
The air is mixed with air taken in from No. 2 and sent to a burner (not shown).

Next, the operation of the present invention will be explained.

First, the temperature control circuit 16 is energized to heat the binding liquid 9 to a desired constant temperature by the temperature sensor 15, which has been set in advance to a predetermined temperature of the heater 14, and the oscillator 12 is energized to generate an ultrasonic vibrator. Vibrate 11.

The vibration of the vibrator is transmitted to the liquid fuel 8 via the coupling liquid 9 and the hemispherical diaphragm 11, and a liquid column 23 is generated near the center of the atomization tank 7, from which fine particles 20 of the liquid fuel 8 are transmitted.
is generated, mixed with combustion air 24 taken in from the intake cylinder 21, and sent as atomized fuel to a burner (not shown) for normal combustion.

In the present invention, since the heater 14 is controlled to a constant temperature, the temperature of the binding liquid 9 can be maintained substantially constant.

In an experimental example, water is used as the binding liquid 9, and by maintaining this water at a predetermined temperature, the ambient temperature is -5 to 45
A substantially constant amount of atomization was obtained over the temperature range.

It goes without saying that liquids other than water shown in the experimental examples of the present invention can also be used as the binding liquid 9.

Further, the hemispherical diaphragm 11 is a polyester film with low thermal conductivity, and a space 17 is provided between the binding liquid 9 and the hemispherical diaphragm 11 to establish communication between the fuel atomization tank 7 and the binding liquid tank 10. Since the heat insulating material 18 is used in the installation part, the amount of heat transferred from the coupling liquid 9 to the fuel is extremely small, and the temperature of the coupling liquid 9 can be set efficiently and high, making it possible to further increase the amount of atomization. It is.

As described above, according to the present invention, in a fuel atomization device in which an ultrasonic vibrator is disposed at the bottom of a binding liquid tank, a heater for heating the binding liquid in the tank, a temperature sensor for detecting the temperature of the heated binding liquid, and Since we have installed a temperature control circuit that controls the temperature of the heater based on the output of the sensor, it is possible to heat the combined liquid to a predetermined temperature and maintain the combined liquid temperature at a constant temperature, regardless of fluctuations in the outside temperature. A constant amount of atomization can be obtained.

In other words, if the temperature of the binding liquid changes due to fluctuations in the ambient temperature, the amount of atomization will be approximately directly proportional to the change in temperature of the binding liquid. Therefore, by heating the binding liquid and maintaining it at a constant temperature, even if the outside temperature fluctuates slightly, The temperature of the combined liquid does not change, and a fixed amount of atomized fuel is obtained.

Therefore, since the fuel itself is not heated at all, it is possible to solve various problems of the atomizing device that heated the fuel, and also to reduce the temperature of the outside temperature in the device in which the coupling liquid was interposed between the fuel and the vibrator. A constant amount of atomized fuel can be obtained by preventing fluctuations in the amount of atomization due to fluctuations.

Therefore, a constant amount of atomized fuel can be obtained regardless of the outside temperature, so in the combustion section that burns the atomized fuel produced by this atomization device, the combustion state and calorific value do not change at all even if the outside temperature fluctuates. It does not change, and a stable combustion state can be obtained without being affected by the ambient temperature.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a cross-sectional structural diagram of a fuel atomization device showing an embodiment of the present invention, Fig. 3 is a performance characteristic diagram of the amount of fuel atomized, and 7 is a fuel Atomization tank, 9 binding liquid, 1
0 is a coupling liquid tank, 11 is an ultrasonic vibrator, 14 is a heater,
15 is a temperature sensor, and 16 is a temperature control circuit.

Claims (1)

[Claims for Utility Model Registration] A coupling liquid tank for acoustic coupling is connected to the bottom of a fuel atomization tank that produces a flammable mixture, and an ultrasonic vibrator is installed at the bottom of the coupling liquid tank. A heater for heating the binding liquid in the binding liquid tank is provided, and a temperature sensor is provided for detecting the temperature of the binding liquid heated by the heater, and based on the output of this temperature sensor, the above-mentioned A fuel atomization device characterized by being provided with a temperature control circuit that controls heating temperature.