JPS5833370Y2 - Oil vaporization burner - Google Patents

Description

[Detailed description of the invention] This invention relates to an oil vaporization burner that vaporizes and burns petroleum fuel such as kerosene.

Conventional petroleum vaporization burners use a metal wall to heat and vaporize the petroleum, and an electric heater cast into the wall heats the oil to a temperature of approximately 200°C or higher, which then combusts it. was common.

Let us briefly explain its configuration with reference to FIG.

In the figure, 1 is an electric heater, 2 is a metal wall into which part 1 is cast, and a part of its inner surface is shaped like an oil vaporization chamber.

3 is a vaporization surface formed on this 2 that actively vaporizes oil; 4 is a pipe for supplying oil onto this vaporization surface 3;
5 is an oil vaporization chamber where oil vaporization and mixing with primary air are performed; 6 is a primary air input pipe to this chamber 5; 7 is a burner plate that burns the air-fuel mixture supplied from this pipe 6; 8 is a flame It is.

Reference numeral 9 denotes a temperature sensing element for the wall 2.

Next, this operation will be explained.

First, the electric heater 1 is energized to heat the metal wall 2, and when the detection element 9 detects that the temperature has reached a predetermined level, the supply of air and fuel is started, and the oil vaporization chamber 5 is heated. to create a mixture of vaporized oil and primary air,
Burn it on the burner plate 7.

In the conventional type, the electric heater is embedded in the metal wall as described above, so that heat transfer from the electric heater to the metal wall is good, but it takes a long time to manufacture.

There were drawbacks such as the difficulty of handling when working with the electric heater already cast.

Another drawback was that a sensing element was required to detect the temperature of the heated metal wall.

This idea was made in order to eliminate the drawbacks of the conventional ones. An electric heater was press-fitted from the outside to the metal wall that constitutes the oil vaporization chamber, and this press-fit electric heater was also connected to the metal wall. The object of the present invention is to provide an oil vaporization burner whose heat transfer characteristics between the wall and the wall do not change even after long-term intermittent use and can be used stably.

An embodiment of this invention will be described below with reference to the drawings.

In Fig. 2, 21 is a vaporization chamber, 1 is a metal wall that constitutes a vaporization chamber with a burner plate attached to the upper part and the lower part where oil can be vaporized, and 1' is provided on the outer wall of this wall 1. The protrusion 1″ is a wall for enclosing a heater etc.
2 is a flat positive temperature coefficient thermistor for heating the wall 1; 3 and 3' are its electrodes; 4 and 4' are lead wires respectively connected to the electrodes; 5 and 5' are electrodes 3 and 3'. 6 is a flat plate for pressing the heater 2, electrodes 3, 3', insulators 5, 5', etc. onto the bottom of the wall 1 with sufficient pressure; 7; is the burner plate,
Reference numeral 8 denotes an air-fuel mixture rectifying plate provided above the vaporization chamber 21.

9 is a primary air supply pipe to the vaporization chamber 21, and 10 is a fuel supply pipe provided substantially concentrically with this pipe 9.

Reference numeral 11 denotes a heating plate for suppressing the amount of heat released from the wall 1 etc. to the outside air, 11' is a bent part provided so as to catch on the protruding part 1', and 11'' is provided with the protruding part 1'. a bent portion provided to prevent the air between the heat shield plate 11 and the wall 1 from unnecessarily replacing with outside air at a place where the heating plate 11 is not closed;
11/II/ is a female screw part at the center of the bottom of the heat shield plate 11, 1
1//// is a wavy part provided concentrically on this female threaded part 11'', and 12 is a male thread that is compatible with the female threaded part 11////. It has become.

12' is a means for making it easier to turn the male screw 12.

The wavy portion 11'' is caused by the spring action of the heating plate 11, and even if each component is slightly deformed due to thermal expansion, etc., the bottom of the wall 1 of the heater portions 2, 3, etc. is always applied with a predetermined force. It is not necessarily necessary as long as the spring action can be exerted even without such a wave shape depending on the material, shape, etc.

To explain the operation of this embodiment, first, the heater 2 is energized to heat the wall 1, and after reaching a predetermined temperature, the supply of air and fuel is started.

The fuel is torn into small particles by the primary air jet and collides with the air against the opposing portions of the wall 1, where they instantaneously vaporize and form an air-fuel mixture.

The air-fuel mixture flows out from the opening of the rectifying plate 8 and is supplied to the burner section, and as shown in the figure, a flame is created on the flame port formed by the upper end of the wall 1 and the burner plate 7.

After the flame is formed, the temperature of the wall 1 is maintained by both the heat transfer from the flame to the upper end of the wall 1 and the thermistor heater 2 .

A heat shield plate 11 is provided so as to surround almost the entire outer surface of the wall 1 in order to prevent heat from being released from the wall 1 to the outside air whether the combustion is in progress or not.

The heating plate 11 is also configured such that the heater section is always pressed by the tip of a male screw 12 provided at the center of the bottom thereof by the spring action of the heating plate 11.

In the above embodiment, the heater part and the wall 1 are connected to each other by screws 12 or the like.
Although an example is shown in which the bottom part of the heat shield plate 11 is press-fitted with the bottom part of the heat shield, it is not necessarily limited to this shape.As shown in FIG. If the bent portion 11' provided at the tip of the hot plate 11 is overlapped with the bent portion 11' as shown in the figure, the heater portion may be automatically press-fitted to the bottom of the wall 1.

In addition, an appropriate spring material may be arranged between the male screw 12 and the flat plate 6 or between the bottom protrusion of the heat shield plate 11 and the flat plate 6 shown in FIG. A similar effect was obtained by omitting the wavy portion 11'' provided to make the spring action more effective.

In addition, when a heat insulating material such as porous ceramic was provided between the flat plate 6 and the spring action, the spring action was effectively exhibited over a wide temperature range.

As described above, according to this invention, the heating plate can perform the two functions of heating the metal wall to vaporize the fuel and pressing the heater against the metal wall, so the device can be made at low cost. In addition, thermally stable operation can be achieved over a long period of time.

By improving the thermal contact in this way, it may also be possible to use effectively even thermistor heaters which cannot be cast, for example.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example, FIG. 2 is a sectional view showing one embodiment of this invention, and FIG. 3 is a sectional view showing another embodiment of this invention. In the figure, 2 is a heater, 1 is a metal wall, 21 is a vaporizing chamber, and 11 is a heating plate.

Claims (2)

[Scope of utility model registration request] (1) In an oil vaporization type burner that has a chamber surrounded by a metal wall that is preheated by an electric heater, and in which the fuel is vaporized and mixed with air. A heat shield plate is provided so as to almost surround the outer periphery of the chamber, and a part of the heat shield plate is activated by its own spring action or by the spring action of a spring material provided between the heat shield plate and the electric heater. , an oil vaporizing burner characterized in that an electric heater is pressed against a metal wall with appropriate pressure to establish thermal contact between the two. (2) Claims for registration of a utility model characterized in that a heat insulating material is disposed between the electric heater and a heat shield plate side member that presses the electric heater to minimize heat conduction to the heat shield plate. The petroleum vaporizing burner according to item 1.