JPH0229387B2 - DENJISHIKICHOONPAFUNSHANOZURU - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates generally to ultrasonic injection nozzles, and in particular to (1) electronically controlled gasoline injection valves or electronically controlled diesel injection valves, (2) fuel for gas turbines. Nozzles, (3) Burners for industrial, commercial, and household boilers, heating furnaces, and heaters, (4) Industrial liquid sprayers, for example, for drying liquid materials such as foods, pharmaceuticals, agricultural chemicals, and fertilizers. (5) non-industrial liquid sprayers, such as agricultural chemical sprayers, disinfectant sprayers The present invention relates to an ultrasonic jet nozzle that can be suitably used for appliances, etc.

BACKGROUND ART Conventionally, in the various fields mentioned above, liquids ("liquid" herein is used to include not only liquids but also liquid substances such as suspension solutions) are atomized, that is, atomized. Pressure atomizing burners or liquid atomizers are used for this purpose. The injection nozzle used in such a spray burner or liquid atomizer atomizes the liquid by a shearing action between the liquid injected from the nozzle and the outside air (atmosphere). Therefore, in order to atomize the supplied liquid, it is necessary to increase the liquid supply pressure, and the liquid supply equipment such as pumps and piping becomes complicated and large.

Furthermore, the injection flow rate can be adjusted by changing the pressure of the supplied liquid or by changing the nozzle injection port area, but with the former method, the atomization condition worsens at low flow rates (low pressure), and it is difficult to improve it. As a measure, medium to large boilers use air or steam to atomize the liquid fuel supplied. As a result, devices have become increasingly complex and large. on the other hand,
In the latter method, the structure of the nozzle is extremely complicated, and its adjustment and maintenance are difficult.

In order to improve these drawbacks of conventional injection nozzles, attempts have been made to apply pressure to the injection port of the injection nozzle to eject liquid and at the same time apply ultrasonic vibrations to the liquid.

Problems to be Solved by the Invention However, conventional ultrasonic liquid injection nozzles have an extremely small amount of spray, and cannot be used in the above-mentioned injection nozzles that require a large amount of atomization.

In order to achieve atomization of a large volume of liquid, the present inventors conducted numerous studies and experiments on the liquid atomization mechanism using ultrasonic waves and the shape of the ultrasonic vibrator. They discovered that by providing an edge part in the edge part and supplying the liquid in the form of a thin film to the edge part, a large amount of liquid can be atomized from the edge part, and proposed an ultrasonic jetting method and a jetting nozzle. Application No. 59-77572 (Japanese Unexamined Patent Publication No. 60-222552)
(see Publication No.).

The present invention relates to an improvement of the injection nozzle according to the invention of the prior application.

Object of the invention The object of the invention is to provide an ultrasonic jet nozzle that can supply liquid continuously or intermittently.

Another object of the present invention is to provide an ultrasonic spray nozzle that can supply a large volume of liquid, atomize or inject a large amount of liquid, and is easy to control and automate.

Another object of the present invention is to provide an ultrasonic injection system with a simple structure, which has a significantly lower liquid supply pressure than conventional injection nozzles, and can therefore reduce the size, weight, and cost of liquid supply equipment. It is to provide a nozzle.

Another object of the present invention is to provide an ultrasonic jet nozzle that can achieve stable atomization in which the state of atomization (flow rate, particle size) does not vary depending on the properties of the supplied liquid, especially the viscosity. .

Still another object of the present invention is to provide an ultrasonic jet nozzle in which the state of atomization hardly changes even at low flow rates, and which can therefore have a very large turndown ratio. .

Means for Solving the Problems The above objects are achieved by the ultrasonic jet nozzle according to the present invention. In summary, the present invention includes an ultrasonic vibration generating means, an elongated vibrator connected at one end to the ultrasonic vibration generating means and having an edge portion at the other end, and an elongated vibrator having an edge portion of the vibrator. a hollow needle valve slidably fitted to the vibrator adjacent to the side end; a supply passage for supplying liquid to the edge portion; and the hollow needle valve is normally connected to the liquid supply passage. spring means acting on the hollow needle valve to move the hollow needle valve against the pressing force of the spring means to close the liquid supply passage; and an electromagnetic means for releasing the ultrasonic jet nozzle.

Next, the ultrasonic jet nozzle according to the present invention will be explained in detail with reference to the drawings. Although the present invention can be suitably used in various applications as described above, in this embodiment, the present invention will be explained in relation to a fuel nozzle for a gas star pin.

Referring to FIG. 1, an injection nozzle according to the present invention, that is, a fuel nozzle 1 for a gas turbine in this embodiment, includes an elongated, generally cylindrical valve body 4 having a central hole 2 at the center.

The center hole 2 includes an upper hole 2a, an enlarged hole 2b connected to the upper hole 2a, and an inclined hole 2c connected to the enlarged hole 2b.

A roughly cylindrical hollow needle valve 6 is slidably provided in the enlarged hole 2b. The hollow needle valve 6 has a through hole 8 coaxially with the center hole 2 of the valve body 4 in its center. Further, a core 10 is integrally attached to the upper end of the hollow needle valve 6 for the purpose to be explained later, and the lower end has an inclined portion 12 having a complementary shape to the inclined hole 2c of the valve box center hole 2. As will be described later, in cooperation with the inclined hole 2c, a liquid fuel supply means, that is, a supply passage 36 (FIG. 3) is constituted. hollow needle valve 6
is constantly biased downward by a spring means 30 disposed between the core 10 and an annular shoulder 13 formed at the connection portion between the upper hole 2a and the enlarged hole 2b, and is therefore hollow. The inclined portion 12 of the needle valve 6 is pressed against the inclined hole 2c of the center hole 2, and the supply passage 36 is closed (the state shown in FIG. 1).

A vibrator 14 is disposed passing through the center hole 2 of the valve box 4 and the through hole 8 of the hollow needle valve 6. Vibrator 14
consists of an upper main body part 16, an elongated cylindrical transducer shaft part 18 having a smaller diameter than the main body part 16, and a transition part 20 connecting the main body part 16 and the shaft part 18. The main body portion 16 has a flange 22 having a larger diameter.
2 is an annular shoulder 24 formed at the upper end of the valve body 4;
It is attached to the valve body 4 by an annular vibrator retainer 26 attached to the upper end of the valve body 4 with bolts (not shown).

The shaft portion 18 of the vibrator 14 projects downward, that is, outward, from the central hole inclined portion 2c formed in the valve box 4, that is, from the liquid supply passage 36. An edge portion 28 is formed at the tip of the vibrator 14, that is, the tip of the shaft portion 18.

According to FIG. 1, the edge portion 28 of the vibrator 14 has an annular step-like shape consisting of four steps whose diameter is gradually reduced, but it may also have a step-like shape of two steps, three steps, or five steps. It is also possible to have a shape in which the diameter increases gradually, or the diameter gradually decreases and then increases, or it can be made to have the same diameter. What is important is that an edge is formed at the tip of the vibrator.

Further, as shown in FIG. 2, the width (w) and height (h) of the edge are such that the width (w) and height (h) of the edge are such that the liquid fuel can be formed into a thin film and that the flow of the liquid can be blocked. Ru.

Further, an electromagnetic means 32 is provided in the valve body 4 in close proximity to the core 10. The electromagnetic means 32 may be a conventional electromagnetic coil and, when energized, act on the core 10 to pull it, and therefore the hollow needle valve 6, upwardly against the spring means 30. to do. An annular recess 34 is formed in the outer diameter portion of the hollow needle valve 6 in order to limit upward movement of the hollow needle valve 6, and an annular stopper 36 protruding from the enlarged hole 2b is fitted into the recess 34. You can also.

As shown in FIG. 3, the inclined hole 2c of the central hole 2 connects with the inclined portion 12 of the hollow needle valve 6 when the hollow needle valve 6 is moved upward by the action of the electromagnetic means 32. They cooperate to form a liquid fuel supply passage 36, that is, to open said fuel supply passage 36.
The fuel supply port 38 of the fuel supply passage 36 opens approximately adjacent to the upper end of the edge portion 28.
The other end 40 of 8 is a fuel passage hole 4 formed in the valve box 4.
2. Liquid fuel is supplied to the fuel passage hole 42 via a conduit 46 from a fuel supply source (not shown). As understood from the above explanation, fuel supply/stop is performed by turning on/off the energization to the electromagnetic means 32.
OFF, and the fuel supply flow rate could also be adjusted by controlling the amount of current applied to the electromagnetic means. In addition, this injection valve can be used as an electronically controlled gasoline injection valve or an electronically controlled diesel injection valve by intermittently energizing the solenoid valve and maintaining a constant supply pressure of liquid from the fuel supply source. Can be done.

In the above configuration, the vibrator 14 includes the main body 16
ultrasonic vibration generating means 100 operatively connected to
It vibrates continuously. At this time, the electromagnetic means
When turned on, liquid fuel flows through the pipe 46 and through hole 4.
2 and the supply passage 36 to the edge portion 26, the liquid fuel is atomized and injected outward.

One specific condition and various dimensions of the ultrasonic jet nozzle according to the present invention explained above are as follows.

Output of ultrasonic generator: 10W Vibrator amplitude: 30μm Frequency: 38KHz Transducer shape and dimensions 1st stage: 4mm diameter 2nd stage: 5mm diameter 3rd stage: 6mm diameter 4th stage: 7mm diameter Height of each stage (h ): 1.5mm Fuel Oil type: Kerosene Flow rate: 10cm ³ /sec Injection pressure: 5Kg/cm ² Temperature: Room temperature Oscillator material: Titanium (or iron) Effects of the invention As explained above, in the conventional injection nozzle, A fuel supply pressure of 30 to 100 kg/cm ² was required, but the injection nozzle of the present invention requires only a low pressure of 0 to several tens of kg/cm ² , making fuel equipment smaller, lighter, and lower in cost. be done. The spray nozzle of the present invention also allows for the spraying or injection of large volumes of liquid.

Further, according to the present invention, since the supply/stop of the supply liquid and the supply flow rate are controlled by electromagnetic means,
The advantage is that the control of the injection nozzle is simple and automation is very easy.

Furthermore, the injection nozzle of the present invention has the advantage that stable atomization of the liquid can be achieved regardless of the properties of the liquid and even at low flow rates, and a very large turndown ratio can be achieved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an ultrasonic injection nozzle according to the invention in a non-operational state. FIG. 2 is a partially enlarged view of the edge portion of the vibrator. FIG. 3 is a cross-sectional view of the ultrasonic injection nozzle of FIG. 1 in an activated state. 1: Ultrasonic injection nozzle, 4: Valve box, 8: Liquid supply means, 14: Vibrator, 28: Edge part, 32:
Electromagnetic means, 38: Liquid supply port, 100: Ultrasonic vibration generation means.

Claims (1)

[Claims] 1 An ultrasonic vibration generating means, an elongated vibrator connected at one end to the ultrasonic vibration generating means and having an edge portion at the other end, and an elongated vibrator adjacent to the end portion of the vibrator on the side having the edge portion. a hollow needle valve slidably fitted to the vibrator; a supply passage for supplying liquid to the edge portion; and the hollow needle valve is normally pressed toward the liquid supply passage. , a spring means adapted to close the liquid supply passage; and an electromagnetic means acting on the hollow needle valve to move the hollow needle valve against the pressing force of the spring means and to open the liquid supply passage. An ultrasonic jet nozzle comprising: