JPH05654Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a vaporizing oil combustion device that vaporizes and burns petroleum fuel such as kerosene.

(b) Conventional technology Conventionally, this type of vaporizing oil combustion equipment
As disclosed in Publication No. 2814, a burner case surrounding the outer periphery of a burner body equipped with an electric heater for preheating and vaporizing petroleum fuel is provided, and a portion of the air blown from the blower is used as secondary air within the burner case. The secondary air rises within the space between the burner case and the burner body and is supplied to the flame formed at the burner port to promote combustion.

(c) Problems to be solved by the invention However, in the above-mentioned configuration, when a strong combustion state is created, a large amount of secondary air is supplied into the burner case to suit the strong combustion flame, resulting in combustion. However, during this strong combustion, the combustion flame spreads widely and moves away from the flame opening, making it difficult for the burner body to be heated by the combustion flame, and the burner body Since the surrounding wall is cooled by a large amount of secondary air supplied, sufficient heat backing is not performed, and the burner thermistor detects the decreased temperature of the burner body, causing the electric heater to be energized frequently. , there was a problem that the energization time was long.

Of course, as described in Japanese Utility Model Application Publication No. 154716/1983, if the burner body is covered with a bottomed cylindrical vaporizer case, the burner body will be less likely to be cooled by the secondary air inside the burner case. However, since the contact area between the carburetor case and the secondary air is large,
There was a drawback that the burner body was easily cooled through the carburetor case.

The present invention was developed in view of the above-mentioned facts, and is intended to efficiently prevent the burner body from being cooled by the secondary air supplied into the burner case, thereby stabilizing the temperature of the burner body. The purpose of this is to reduce power consumption as well as to reduce power consumption.

(d) Means for solving the problem This invention includes a burner body 1 equipped with an electric heater 2 for preheating and vaporizing fuel, and a fuel supply means (fuel supply device 1) for supplying fuel into the burner body 1.
1), a detection element (burner thermistor 3) that detects the temperature of the burner body 1, a burner case 12 provided on the outer periphery of the burner body 1, and a burner case 12 that supplies primary air into the burner body 1 and In a vaporizing oil combustion apparatus including an air supply means (blower 8) for supplying secondary air into a case 12, the burner body 1 and the burner case 1 are provided.
2, a burner body cooling prevention member (cooling prevention cylinder 16) is provided which stands up from the bottom wall of the burner body so as to surround the burner body 1.

(E) Function The secondary air sent from the blower 8 flows into the burner case 12 from the secondary air inlet 14, and the secondary air rises between the peripheral side 12B of the burner case 12 and the cooling prevention tube 16. and the peripheral side wall 1 of the burner body 1
The burner body 1 is supplied to the combustion flame in such a manner that it does not come into contact with A and does not cool the burner body 1.

(F) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. Reference numeral 1 denotes a bottomed cylindrical burner body made of cast iron or die cast aluminum, and an electric heater 2 such as a sheathed heater is buried in the open end of the upper part. 3 is the burner body 1
The burner thermistor serves as a detection element for detecting the temperature of the circumferential wall 1A of the burner body 1, and has the function of controlling energization to the electric heater 2 according to the temperature of the circumferential wall 1A of the burner body 1. Reference numeral 4 denotes an air supply nozzle that supplies primary air into the vaporization chamber 5 of the burner body 1, and communicates with the blower 8 via the air supply duct 6. Reference numeral 9 denotes an air supply regulator installed in the middle of the air supply duct 6 or at the outlet of the blower 8. In the case of strong combustion, the air hole 6A is opened with a solenoid valve 9A, and in the case of weak combustion, the solenoid valve 9A is opened.
The air hole 6A is closed, and the amount of air supplied is varied depending on the strength of the combustion amount. Reference numeral 10 denotes a refueling nozzle that is inserted into the air supply nozzle 4 so that its tip faces into the vaporization chamber 5. It is in communication with the vaporization chamber 5 and supplies petroleum fuel into the vaporization chamber 5. The fuel supply device 11 is capable of increasing or decreasing the amount of fuel supplied in accordance with switching between strong and weak combustion. 1
2 is a cylindrical burner case with a bottom provided so as to surround the outer periphery of the burner body 1;
The bottom of the burner body 1 is fixedly supported on the upper surface side of the bottom wall 12A of the burner case 12 via a heat insulating material 13, and a secondary air inlet 14 is provided near the lower end of the peripheral side 12B of the burner case 12. A secondary air duct 15 branching from the air supply duct 6 is connected to the secondary air inlet 14 . 16 is a circumferential wall 1A on the outside of the circumferential wall 1A of the burner main body 1.
A cooling prevention tube as a burner body cooling prevention member disposed with a distance X of approximately 5 to 8 mm from the outer surface, and the cooling prevention tube is configured in a cylindrical shape with a thin metal plate such as a stainless steel plate or a galvanized steel plate. The mounting piece 17 provided at the lower end is attached to the burner case 1.
It is attached to the bottom wall portion 12A of No. 2 by spot welding or the like. The cooling prevention tube 16 is provided with an air supply nozzle through hole 18 and a burner thermistor through hole 19. Reference numeral 20 denotes a burner head provided at the upper part of the burner body 1, and a burner opening 21 is provided on the circumferential side of the burner head to direct the flame F to the side or diagonally to the side. 22 is a spark plug that ignites a mixture of vaporized petroleum fuel and primary air, and 23 is a flame rod as a sensor of a flame detection device, each of which is attached to the upper flange 12C of the burner case and faces the flame port. A combustion tube 24 forms a combustion chamber Y with the burner head 20 and the burner body 1.

The operation of the above configuration will be explained below.

First, when a combustion start switch (not shown) is closed, the electric heater 2 is energized and the burner body 1 is heated. When the burner thermistor 3 detects that the burner body 1 has reached the vaporization temperature of petroleum fuel, the blower 8 is turned on. After pre-purging is performed by introducing primary and secondary air through the air supply duct 6 and the secondary air duct 15, the fuel supply device 11 supplies petroleum fuel through the fuel supply nozzle 10. Then, since the tip of the air supply nozzle 10 is thin, the flow rate of the primary air from the air supply duct 6 becomes faster, and the supplied petroleum fuel becomes a mist.
It becomes a vaporized gas in the vaporization chamber 5 in the heated burner body 1, mixes with the primary air, blows out from the flame port 21, is ignited by the spark plug 22, forms a combustion flame F, and burns. The secondary air supplied into the burner case 12 from the secondary air inlet 14 is directed to the burner body 1 because the cooling prevention tube 16 is arranged at a distance X from the burner body 1. Since it is supplied to the combustion flame F without direct contact, combustion is promoted without lowering the temperature of the burner body 1.
When the cooling prevention cylinder 16 is used as the burner body cooling prevention member in this way, the above-mentioned effects can be obtained simply by attaching the cooling prevention cylinder 16 to a conventional vaporizing oil combustion apparatus.

In addition, instead of using the cooling prevention tube 16 as a member for preventing cooling of the burner body, a heat insulating material is used on the peripheral side wall 1 of the burner body 1.
They may be arranged so as to surround A.

(G) Effect of the invention Not only is the burner body not cooled by the secondary air supplied into the burner case due to the cooling prevention member, but the cooling prevention member is not only raised from the bottom wall of the burner body. As a result, the contact area between the cooling prevention member and the secondary air can be reduced to prevent the burner body from being cooled as much as possible through the cooling prevention member, so the temperature of the burner body can be stabilized and the vaporization state of the fuel can also be reduced. Stable and good vaporization combustion can be performed.

Furthermore, since the heat retention of the burner body can be improved, the time during which the electric heater is energized can be reduced, and power consumption can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the overall configuration of a vaporizing oil combustion apparatus equipped with a cooling prevention tube of the present invention, FIG. 2 is a cross-sectional view of the main part of the burner, and FIG. 3 is a perspective view of the cooling prevention tube. 1...Burner body, 1A...Surrounding wall, 12...
Burner case, 16... Cooling prevention tube, 17... Mounting piece, 18... Air supply nozzle through hole, 19... Burner thermistor through hole.

Claims (1)

[Scope of utility model registration request] A burner body equipped with an electric heater that preheats and vaporizes fuel, a fuel supply means that supplies fuel into the burner body, a detection element that detects the temperature of the burner body, and a burner case provided on the outer periphery of the burner body. , in a vaporizing oil combustion device equipped with an air supply means that supplies primary air into the burner body and supplies secondary air into the burner case,
A vaporizing oil combustion device characterized in that a burner body cooling prevention member is provided between the burner body and the burner case and stands up from the bottom wall of the burner body so as to surround the burner body.