JP2652900B2 - Liquid fuel vaporized combustor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid fuel vaporization type combustor mainly used for heaters and water heaters used at home.

(Prior Art) Conventionally, as shown in FIG. 3, a valve b interposed in a nozzle a of a liquid fuel vaporization type combustor of this type is an electromagnetic valve type in which the valve b is opened by energizing a solenoid c.

(Problem to be Solved by the Invention) Therefore, the valve b itself is magnetized, and liquid fuel such as iron mixed in kerosene adheres to the valve b, and a gap between the valve b and the valve seat d is formed. However, there is a problem that the valve is inadequately closed due to being pinched, and the structure is complicated.

An object of the present invention is to obtain a liquid fuel vaporization type combustor free of such problems.

(Means for Solving the Problems) In order to achieve such an object, the present invention provides a fuel vaporization type combustor according to claim 1, wherein a liquid fuel vaporized by the vaporizer is used.
A combustor of a type that blows into a burner from a nozzle port connected to the vaporizer, wherein a valve body for opening and closing the valve body is provided in a valve housing having the nozzle port, and the nozzle port is closed by the valve body. When a return path for returning fuel to the fuel supply side is opened through the valve housing, a spring force is generated by self-heating when the valve body is energized, and the valve body is generated by the spring force. A shape memory alloy spring resilient to the valve opening side;
The valve body is provided with an auxiliary spring that resiliently moves toward the valve closing side.

A fuel vaporization type combustor according to claim 2, wherein the liquid fuel vaporized by the vaporizer is blown into a burner from a nozzle port connected to the vaporizer, and is provided in a valve housing having the nozzle port. And a return passage for returning fuel to the fuel supply side through the valve housing when the nozzle port is closed with the valve body, The valve body is provided with a shape memory alloy spring that generates a spring force by self-heating when energized and that springs the valve body toward the valve closing side, and an auxiliary spring that springs the valve body toward the valve opening side. Consisting of

(Operation) In the liquid fuel vaporization type combustor according to claim 1 having the above configuration, when the shape memory alloy spring is not energized, the spring has no spring force. Therefore, the valve body is pushed by the auxiliary spring, closes the nozzle port moved leftward as shown in the drawing, and keeps the return passage open.

Therefore, in order to perform combustion in the burner, the shape memory alloy spring is energized, and the self-heating of the shape memory alloy spring generates a spring force, and the valve body is moved rightward by the spring force. A return passage that opens the nozzle port and returns fuel to the fuel supply side through the valve housing is closed. In this way, the fuel vaporized by the vaporizer is blown out from the nozzle port and sent to the burner.

To extinguish, the energization of the shape memory alloy spring is stopped. Then, since the shape memory alloy spring loses its spring force, the valve element is moved by the auxiliary spring to the left to close the nozzle port and return fuel to the fuel supply side through the valve housing. Is opened, the fuel vaporized by the vaporizer is returned to the fuel supply side via the return passage. Therefore, the supply of fuel to the burner is stopped.

In the liquid fuel vaporization type combustor according to claim 2 having the above configuration, when the shape memory alloy spring is not energized, the spring has no spring force. Accordingly, the valve element is pushed by the auxiliary spring to open the nozzle port moved rightward as shown in the drawing, and keeps the return passage closed.

Therefore, in this case, when the shape memory alloy spring is not energized, the fuel vaporized by the vaporizer is ejected from the nozzle port and sent to the burner.

To digest, the shape memory alloy spring is energized. Then, the valve body moves leftward against the spring force of the auxiliary spring by the spring force of the shape memory alloy spring, closes the nozzle port, and supplies fuel through the valve housing to the fuel supply side. The return path is opened, so that the fuel vaporized by the carburetor is returned to the fuel supply side via the return path.

 Therefore, the supply of fuel to the burner is stopped.

(Examples) Examples of the present invention shown in the drawings will be described.

In the drawing, 1 is a burner provided with a mixing tube 3 extending into the burner main body 2 on the side surface and provided with a combustion section 4 on the upper surface, and 5 is a mixing tube 3
A valve housing provided with a nozzle port 6 opposed to an inlet of the valve housing. A valve element 7 for opening and closing the nozzle port 6 is interposed in the valve housing 5 and the nozzle port 6 is closed by the valve element 7. In this case, a return passage 8 for returning fuel to the fuel supply side via the valve housing 5 is provided, and the return passage 8 is opened only when the nozzle port 6 is closed by the valve body 7.

9 is a carburetor connected to the valve housing 5, 10 is a fuel supply source, 11
Denotes a passage for supplying fuel from the fuel supply source 10 to the nozzle port 6, and the passage 11 includes the carburetor 9 and an oil leveler 12 and an electromagnetic pump 13 interposed upstream thereof.

The configuration so far is not particularly different from those conventionally known.

In the embodiment shown in FIG. 1, when the valve body 7 is energized, a spring force is generated by self-heating and the valve body 7 is opened by opening the nozzle port 6 by the spring force. It is provided with a shape memory alloy spring 14 resilient on the valve side and an auxiliary spring 15 resilient on the valve body 7 on the valve closing side. To explain this further, the valve housing 5 is provided with a burner 1 on one side thereof. And a valve port 16 interposed in the return passage 8 on the other side of the valve housing 5. When the valve element 7 moves leftward in the drawing, the nozzle The port 6 is closed and the valve port 16 is opened. Conversely, when the valve element 7 moves to the right in the drawing, the nozzle port 6 is opened and the valve port 16 is closed with the valve element 7.

The valve element 7 includes a support rod 17 projecting rearward through the valve port 16. The support rod 17 slidably supports the valve element 7 in the valve housing 5. The shape memory alloy spring 14 and the auxiliary spring 15 are provided at a portion of the valve housing 5 projecting rearward from the valve housing 5, and a cover 18 is provided at a portion where the springs 14 and 15 are attached.
To explain this, the shape memory alloy spring 14 is interposed between the E-ring 19 provided on the support rod 17 and the valve housing 5, and the valve body 8 is elastically moved to the right by the shape memory alloy spring 14. At the same time, the valve body 7 is elastically moved to the left by interposing an auxiliary spring 15 between the E-ring 19 and the cover 18, and the shape memory alloy spring
When the power was supplied to 14, the valve 7 was moved so that the nozzle port 6 was opened.

However, as shown in FIG. 2, the auxiliary spring 15 is interposed between the E-ring 19 provided on the support rod 17 and the valve housing 5, and the valve body 7 is moved to the right by the auxiliary spring 15. A shape memory alloy spring between the E-ring 19 and the cover 18
When the shape memory alloy spring 14 is energized with the intervening portion 14, the valve element 7 may be moved to the side where the nozzle port 6 is opened.

In FIG. 1, reference numeral 20 denotes an electric heater provided in the vaporizer 9;
Reference numeral 21 denotes a power supply provided in the shape memory alloy spring 14.

(Effects of the Invention) Since the present invention is configured as described above,
The following effects are obtained.

3. The fuel vaporization type combustor according to claim 1, wherein when the valve body is energized, a self-heating generates a spring force, and the spring force causes the valve body to resiliently close to the valve closing side. The valve element can be operated by a simple configuration in which only a spring and an auxiliary spring that resiliently springs the valve element toward the valve-opening side are provided.
Since the magnet is not magnetized, a problem caused by the magnetization, for example, iron or the like mixed in kerosene adheres to the valve b, and is caught between the valve b and the valve seat d. The problem of becoming sufficient can be solved.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a partial side view showing a modification thereof, and FIG. 3 is a side view showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Burner, 2 ... Burner main body 5 ... Valve housing, 6 ... Nozzle port 7 ... Valve body, 8 ... Return passage 14 ... Shape memory alloy spring, 15 ... Auxiliary spring

Claims (2)

(57) [Claims] 1. A combustor in which liquid fuel vaporized by a vaporizer is blown into a burner from a nozzle port connected to the vaporizer, and a valve body for opening and closing the valve body in a valve housing having the nozzle port. And a return passage for returning fuel to the fuel supply side through the valve housing when the nozzle port is closed with the valve body is opened, and the valve body is energized. When the self-heating generates a spring force, the shape memory alloy spring that springs the valve body toward the valve opening side by the spring force and an auxiliary spring that springs the valve body toward the valve closing side provide liquid fuel vaporization combustion. vessel. 2. A combustor of a type in which liquid fuel vaporized by a vaporizer is blown into a burner from a nozzle port connected to the vaporizer, wherein a valve body for opening and closing the valve body is provided with the nozzle port. And a return passage for returning fuel to the fuel supply side through the valve housing when the nozzle port is closed by the valve body is opened, and the valve body is energized. When the self-heating generates a spring force, the shape memory alloy spring that springs the valve body toward the valve closing side by the spring force and an auxiliary spring that springs the valve body toward the valve opening side provide liquid fuel vaporization combustion. vessel.