JPS63243618A - Liquid fuel vaporizing device - Google Patents

Abstract

PURPOSE:To shorten preheating time, by a method wherein a vaporizing chamber is formed with a double cylinder of an inner and an outer cylinder, the inner cylinder is formed with the outer peripheral part of a heater for application from the outer cylinder, and a nozzle is situated to the protrusion part and in a direction of extending perpendicularly to the axis of the inner cylinder. CONSTITUTION:By energization of a heater 25 for application of heat, the heater 25 is actuated. When the temperature of a tip part 22a increases and the temperature of a temperature detecting device 30 increases to a given value, fuel is fed to a vaporizing chamber 23 through a feed pipe 24. Thus, the fuel is brought into contact with the surface of an inner cylinder 22 for vaporization, and the vaporized fuel flows through a fuel steam outflow port 29 to a nozzle pointing in a direction of extending at right angles with the axis of the inner cylinder and is injected in a burner. This constitution eliminates the need of a conventional metallic block, having a high heat capacity and situated in a steam passage, and enables shortening of preheating time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a liquid fuel vaporization device whose vaporization chamber is a space formed by a double cylinder.

(Prior Art) In a conventional liquid fuel vaporizer, especially one in which a nozzle is provided perpendicular to the axis of the device, for example, as shown in FIG.
) As shown in (b), many had a nozzle part provided on the outer periphery of the double-barreled outer cylinder. That is, outer cylinder 1 and inner cylinder 2
A vaporization chamber 3 is formed by this, and liquid fuel is supplied into this vaporization chamber 3 through a fuel pipe 4. This fuel is vaporized by heating by the heater 5, passes through a steam passage 6 provided on the outer periphery of the outer cylinder 1, reaches a nozzle 7, and is ejected toward the burner.

In such a liquid fuel vaporization device, in order to guide the fuel vapor generated in the vaporization chamber 3 to the nozzle 7, a metal plate 8 with a large heat capacity is provided on the outer periphery of the outer cylinder 1 having a large diameter. It forms a passage 6 and also forms an attachment part for a temperature detection device 10 for detecting vaporization temperature. Therefore, these steam passages 6 and the temperature sensing device fIj10 had a structure in which they were in thermal contact with the heater 5 through the metal block 8, the metal seal 11, and the bolt-shaped portion 9.

(Problems to be Solved by the Invention) When the vaporizer having the above configuration is heated by the heater 5, the heat to the temperature detection device 10 is first transmitted through the bolt-shaped portion 91 that is integrated with the heater 5, and then the metal seal 11. The heat was transmitted from the metal block 8 to the metal block 8 through a path with high thermal resistance.

Moreover, since the metal block 8 has a large heat capacity, it takes a considerable amount of time for the temperature of the part where the temperature detection device 10 is installed to rise to a predetermined value.

Therefore, a heater equipped with this type of vaporizer has a serious problem in that it takes a long time from the start of operation to when heating is actually performed, the so-called "preheating time."

The present invention was made to solve these problems, and an object of the present invention is to provide a liquid fuel vaporizer that can reduce the heat capacity of the portion forming the steam passage and shorten the preheating time.

[Structure of the Invention (Means for Solving the Problems)] In order to achieve the above object, the liquid fuel vaporizer of the present invention has a double cylinder, an inner cylinder and an outer cylinder, and at least a part of the inner cylinder is connected to the outer circumference of the heater. It is characterized in that the tip of the inner cylinder is made to protrude from the end of the outer cylinder, and a nozzle is provided in this part in a direction perpendicular to the axis of the inner cylinder.

(Function) With this configuration, there is no need to configure the portion that becomes the steam passage with a metal block with a large heat capacity, and the nozzle and temperature detection device can be connected to the heater without intervening parts with large thermal resistance. Since it can be connected, the temperature can be raised quickly and the preheating time can be shortened.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1(a)fb), 21 is an outer cylinder, 22 is an inner cylinder, and a vaporization chamber 23 is formed between the outer cylinder 21 and the inner cylinder 22. A fuel supply pipe 24 is connected thereto. 25 is a heater inserted along the axis of the outer cylinder 21;
A part of the heater 25 is formed by the outer circumference of the heater 25. The other parts of the inner part 22 are attached integrally with the heater 22 and have very low thermal resistance, and are made of a material with high thermal conductivity, such as brass. The tip 22a of the inner tube 22 is provided to slightly protrude from the edge of the outer tube 21, and the protruding tip 22a
A fuel vapor outflow pipe 26 is provided in a direction perpendicular to the axis of the pipe, and a nozzle 27 is provided at the tip thereof.
are connected.

A ventilation hole 28 is formed around the inner cylinder 22, and
An outflow hole 29 is formed in the vapor outflow pipe 25, and the vaporization chamber 23 is configured to communicate with a nozzle 27 via the fuel vapor outflow pipe 26 through these ventilation holes 28 and outflow holes 29. 30 is a temperature detection device provided at the tip 22a of the inner cylinder 22.

In the liquid fuel vaporization device having the above configuration,
When the heater 25 is energized to start heating, the surface temperature of the heater 25 rises, and the temperature of the tip 22a, which is formed with low thermal resistance, also begins to rise accordingly. When the temperature of the tip 22a rises and the temperature detection device '1130 indicates a predetermined temperature, a liquid fuel supply pump (not shown) starts supplying fuel, which flows into the vaporization chamber 23 through the fuel supply pipe 24. .

Note that, before the temperature decreases due to the supply of liquid fuel to the vaporizer, the energization state of the heater 25 is maintained by the action of the temperature detection device 30;
When the temperature becomes higher than a predetermined temperature, the power supply to the heater 25 is cut off, so that the liquid fuel sent from the fuel supply pipe 24 is always vaporized at a constant temperature and sent to the nozzle 27.

In this liquid fuel vaporizer, the nozzle 27 and the temperature detection device R30 are provided in the inner cylinder 4, which has a small diameter and small heat capacity, so unlike conventional devices, a metal plate with a large amount of heat exchange is provided on the outer periphery of the outer cylinder. No need for nozzle 27
Since the thermal resistance from the temperature detection device 30 to the temperature detection device 30 is also small, the temperature rises faster than that of the conventional device, and the preheating time can be significantly shortened.

Note that the present invention is not limited to the first embodiment described above, and can be implemented with various modifications without changing the gist.

For example, in the above-mentioned embodiments, a case is shown in which the nozzle is provided vertically with respect to the axis of the inner cylinder, but the present invention is not limited to this, and can be configured to have different intersecting angles.

Further, in the above embodiment, a fuel vapor outflow pipe with a nozzle at the tip is provided by penetrating the tip of the inner cylinder, but it is provided by being attached to the outer periphery of the tip. You can also do it like this.

[Effects of the Invention] According to the present invention, it is possible to provide a liquid fuel vaporization device that can reduce the heat capacity of the portion forming the steam passage and shorten the preheating time.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) show an embodiment of the present invention, fa) is a vertical cross-sectional view showing the overall structure, and FIG.
Figure B is a longitudinal cross-sectional view of the line B-B', and Figure 2(a)
(b) shows an example of a conventional liquid fuel vaporization device (
(a) is a vertical cross-sectional view showing the overall configuration, (b) is (a) Figure B
- It is a longitudinal cross-sectional view of the i line part. 21...Outer cylinder 22...Inner cylinder 22a...
Tip part 23... Vaporization chamber 24... Fuel supply pipe 25... Heater 26... Fuel vapor outflow pipe 27... Nozzle 28... Vent hole
29...Outflow hole 30...Temperature detection device

Claims (4)

[Claims] (1) The inner cylinder has a double inner and outer cylinder, and at least a part of the inner cylinder is formed by the outer peripheral part of the heater, and the tip of the inner cylinder protrudes from the end of the outer cylinder, and the axis of the inner cylinder is located at this part. A liquid fuel vaporization device characterized in that a nozzle is provided in a direction intersecting the direction of the fuel vaporization device. (2) The liquid fuel vaporization device according to claim 1, wherein the nozzle is provided in a direction perpendicular to the axis of the inner cylinder. (3) The liquid fuel according to claim 1 or 2, wherein the nozzle is provided at the tip of a fuel vapor outflow pipe, and this pipe is provided to penetrate the tip of the inner cylinder. vaporizer. (4) The liquid fuel vaporization device according to any one of claims 1 to 3, further comprising a temperature detection device at the tip of the inner cylinder.