JPH0414241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oil burner used in a forced air supply/exhaust type oil hot air heater, and more specifically, to a jet spray type oil burner.

[Conventional example]

A jet spray type oil burner is equipped with an air chamber that communicates with a blowing means, and a cylindrical vaporizer with a bottom that is arranged approximately concentrically within the air chamber. An inlet hole is drilled almost tangentially to the air inlet hole, and a fuel pipe is inserted into the air inlet hole, so that a portion of the air from the blower is blown into the carburetor as primary air through the air inlet hole. The fuel from the fuel pipe is atomized to form a vortex flow, and the remaining air from the blower is supplied to the combustion section of the carburetor as secondary air, so it is a rotary type oil with no moving parts. The structure is simpler than that of a burner.

[Problem that the invention seeks to solve]

The combustion characteristics of this jet spray oil burner depend exclusively on the amount of primary air and the amount of secondary air, but in the past, the ratio was constant from the time of ignition to the time of combustion. The drawback was that ignition errors were likely to occur depending on the conditions.

[Means for solving problems]

In order to solve the above-mentioned conventional drawbacks, the present invention includes an air chamber communicating with an air blowing means, and a bottomed cylindrical vaporizer disposed approximately concentrically within the air chamber, and a cylindrical wall of the vaporizer. An air inlet hole is drilled in a predetermined part of the carburetor in a direction substantially tangential to the air inlet hole, and a fuel pipe is inserted into the air inlet hole, and a secondary air supply is provided in the center of the carburetor extending from the bottom to the combustion section side. A part of the air from the blowing means is blown into the vaporizer as primary air through the air inflow hole to atomize the fuel from the fuel pipe to form a vortex flow, and In a jet spray oil burner in which the remainder of the air from the blowing means is supplied as secondary air to the combustion section from around the air supply cylinder and the vaporizer, the opening of the secondary air supply cylinder is The control valve is provided with a control valve arranged to be movable back and forth, and a control valve driving means for driving the control valve so as to increase the amount of secondary air reaching the combustion section from the secondary air supply cylinder at the time of ignition.

[Effect]

In the above configuration, at the time of ignition, the control valve is moved in a direction away from the opening of the secondary air supply cylinder.
As a result, as the amount of secondary air increases, the amount of primary air decreases relatively, resulting in an oil-rich condition. On the other hand, during combustion, the control valve is moved in a direction closer to the opening of the secondary air supply tube, and as a result, the amount of secondary air decreases and the amount of primary air increases, contrary to the above.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, this oil burner 1 includes an air chamber 4 connected to a blower fan 2 via a duct 3. This air chamber 4 is made of, for example, a cylindrical body with a bottom, and a vaporizer 5 is located approximately in the center of the air chamber 4.
are arranged concentrically. The carburetor 5 consists of a bottomed cylindrical body having a preheater 6 on its outer periphery, but in this case, a secondary air supply cylinder is provided approximately in the center of the carburetor 5 from the bottom toward the combustion section 5a of the carburetor 5. 7 are erected. An air inflow hole 8 is formed in a predetermined portion of the cylindrical wall of the carburetor 5, and the air inflow hole 8 is oriented substantially in the tangential direction. A fuel supply pipe 9 for supplying petroleum fuel into the carburetor 5 is inserted through the carburetor 5 . Further, a disk 10 having a secondary air supply hole 10a is provided on the outer periphery of the carburetor 5.

Therefore, a part of the air supplied from the blower fan 2 flows into the carburetor 5 as primary air from the air inflow hole 8 in a whirlpool shape, and at this time, the fuel from the fuel supply pipe 9 flows into the primary air. The liquid is atomized and vaporized in the vaporizer 5. On the other hand, the remainder of the air supplied from the blower fan 2 is supplied as secondary air to the combustion section 5a from the secondary air supply cylinder 7 and the secondary air supply hole 10a of the disc 10.
According to this invention, the control valve 11 is arranged to be movable toward and away from the bottom opening 7a of the secondary air supply cylinder 7, and the control valve driving means 12 for driving the control valve 11 is provided.

In the embodiment shown in FIG. 1, the control valve driving means 12 is composed of a solenoid 13 that is operated by a detection signal from a flame current detection section (not shown) provided in the combustion section 5a, and the control valve 11 is operated by the solenoid 13. The plunger 13a is attached to the plunger 13a. That is, at the time of ignition, the control valve 11 is held in a state away from the bottom opening 7a of the secondary air supply tube 7 by the solenoid 13, so that the maximum amount of secondary air flows from the bottom opening 7a to the combustion section 5a. Therefore, the amount of primary air flowing into the carburetor 5 becomes relatively minimum. As a result, the fuel concentration in the carburetor 5 is increased, and the flow velocity of the air-fuel mixture blown out from the flame hole 5b of the burner head is minimized, improving ignition performance. When a flame current is detected due to ignition, contrary to the above, the control valve 11 is held close to the bottom opening 7a of the secondary air supply cylinder 7 by the solenoid 13,
While the amount of secondary air flowing from the bottom opening 7a to the combustion section 5a is minimized, the amount of primary air flowing into the carburetor 5 is relatively maximized. After ignition, the temperature of the incoming air increases and the air concentration becomes thinner, so the combustion concentration becomes higher and the combustion speed at the flame hole 5b increases, but as mentioned above, the primary air amount is increased. , the optimum premixture for combustion can be obtained. In addition, there is also a secondary air supply hole 1 around the carburetor 5.
0a is provided, and like the primary air amount, the amount of secondary air blown out is the minimum at the time of ignition and the maximum after ignition, so there is no risk of a shortage of secondary air before and after ignition.

FIG. 2 shows a modification of the invention.
That is, in this modification, the control valve 11 is held by a coil spring 14, and a spring 16 made of a shape memory alloy is communicated with the control valve 11 via a wire 15. This spring 16 is locked to, for example, a disk 10, and contracts when the temperature is low before ignition, resisting the coil spring 14 and holding the control valve 11 away from the bottom opening 7a of the secondary air supply cylinder 7. do. When the temperature rises after ignition, spring 1
6 expands, whereby the regulating valve 11 is held close to the bottom opening 7a by the biasing force of the coil spring 14. In this way, the ratio between the primary air amount and the secondary air amount can be changed as in the above embodiment.

〔effect〕

As described above, according to the present invention, there is provided a jet spray type oil burner that is free from the risk of ignition errors and can achieve complete combustion during combustion.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an oil burner according to the present invention, and FIG. 2 is a sectional view similar to FIG. 1 showing a modified example of means showing a modified example of the present invention. In the figure, 1 is an oil burner, 2 is a blower fan, 3
is a duct, 4 is an air chamber, 5 is a carburetor, 5a is a combustion section, 6 is a preheater, 7 is a secondary air supply cylinder, 8 is an air inflow hole, 9 is a fuel supply pipe, 10 is a disc,
10a is a secondary air supply hole, 11 is a control valve, 12 is a control valve driving means, 13 is a solenoid, and 16 is a shape memory alloy spring.

Claims (1)

[Claims] 1. An air chamber that communicates with a blowing means and a cylindrical vaporizer with a bottom that is arranged approximately concentrically within the air chamber, and air flows into a predetermined portion of the cylindrical wall of the vaporizer. A hole is bored almost tangentially to the hole, a fuel pipe is inserted into the air inflow hole, and a secondary air supply tube is formed in the center of the carburetor, extending from the bottom toward the combustion section. A part of the air from the air blowing means is blown into the vaporizer as primary air through the air inflow hole to atomize the fuel from the fuel pipe to form a vortex, and at the same time, the air from the air blowing means is blown into the vaporizer as primary air. In a jet spray oil burner in which the remaining air is supplied as secondary air to the combustion section from around the secondary air supply cylinder and the carburetor, the burner is movable toward and away from the opening of the secondary air supply cylinder. A control valve is provided, and a control valve driving means for driving the control valve so as to increase the amount of secondary air flowing from the secondary air supply cylinder to the combustion section side at the time of ignition. oil burner. 2. The oil burner according to claim 1, wherein the control valve driving means comprises a solenoid operated by a detection signal from the flame current detection means of the combustion section. 3. The oil burner according to claim 1, wherein the control valve driving means includes a shape memory alloy that operates according to the temperature of the combustion section.