JP2588176Y2 - Gun type burner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gun type burner of a pressurized spray system using kerosene as a fuel, which is used in household water heaters and the like.

[0002]

2. Description of the Related Art Conventionally, in this type, for example, as disclosed in Japanese Utility Model Publication No. 1-25044,
Uniform mixing is obtained by mixing the swirling air by the flame holding plate provided in front of the nozzle and the secondary air supplied from the air hole of the inner shell peripheral wall with the sprayed fuel in the inner shell. Combustion was to take place.

[0003]

In this conventional apparatus, the control of the amount of combustion is performed by turning ON / OFF the combustion.
Alternatively, even if the amount of combustion is variable, the variable width was small, but in recent years, it has been demanded that the variable width be increased as much as possible to obtain a stable hot water supply. No combustion could be obtained.

[0004] The reason for this is that during combustion with small thermal power, the amount of fuel oil sprayed is small and oil droplets evaporate quickly, and mixing with combustion air only in the inner body in front of the flame holding plate delays mixing. Therefore, it is considered that good combustion cannot be obtained and smoke is often generated.

[0005]

The present invention focuses on this point and solves the above-mentioned drawbacks. In order to solve the above-mentioned drawbacks, in particular, the structure of the present invention is a cylinder having a nozzle inside and a primary air hole behind the nozzle. An inner combustion cylinder for spray fuel oil combustion provided in front of the nozzle in the cylinder, having a central hole in the center on the nozzle side of the inner combustion cylinder; A flame holding plate formed with a plurality of swirling blades cut and raised at equal intervals from the inside to the outside so as to give a turning force to the air flow, and further on the windward side of the flame holding plate, a smaller diameter than the central hole. The auxiliary flame stabilizing plate formed with the suppression hole and the cut-and-raised hole of the swirl vane and formed with a smaller circulation hole is superposed, and the inner combustion cylinder peripheral wall is provided with a plurality of supply holes.

[0006]

The air blown from the combustion fan 3 flows through the primary air hole 7 into the cylinder 6, which is supplied as primary air to the inner combustion cylinder 8, and a part of the primary air is The fuel is supplied from the supply hole 11 into the inner combustion cylinder 8 through the outer periphery of the combustion cylinder 8, and the remainder is directed to the flame holding plate 10 provided on the nozzle 2 side of the inner combustion cylinder 8, and a part thereof is used as a flame holding plate auxiliary. 14 suppression holes 1
5 and the center hole 9 of the flame holding plate 10 circulate together with the fuel oil sprayed from the nozzle 2, while the flow holes 16 of the flame holding plate
The air passing therethrough is separated into a vertical swirling flow and air flowing toward the axis by the swirling blades 12 of the flame holding plate 10, and the air flowing toward the axis along with the air flowing through the central hole 9 is
In the mixing part 17 on the back side of the flame-holding plate auxiliary 14, it is instantaneously mixed with the fuel oil that has just been sprayed from the nozzle 2, and it is possible to improve combustion particularly at a small thermal power where the spray amount is small. In addition, during combustion other than the small thermal power, the air supplied from the supply hole 11 and the swirl flow of the combustion air in the entire inner combustion cylinder 8 by the swirling blades 12 and the
Thus, good combustion can be obtained by mixing finely, and good combustion can always be performed over the entire range of the thermal power even if the variable range of thermal power is widened.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gun type burner according to the present invention will be described below with reference to a preferred embodiment shown in the drawings. Reference numeral 1 denotes a burner body provided downward in a water heater or the like, which sprays fuel oil pressurized by an electromagnetic pump (not shown) from a nozzle 2 and mixes the sprayed fuel oil with combustion air from a combustion fan 3. To perform pressurized spray combustion.
The fuel oil supplied via the fuel tank is partially returned from a return flow path 5 having an oil proportional valve (not shown), and the amount of combustion is varied over a wide range by controlling the amount of return along with the amount of combustion air. It is like that.

Reference numeral 6 denotes a cylinder in which the nozzle 2 is fixed to the center of the rear wall. A plurality of primary air holes 7 through which combustion air from the combustion fan 3 flows are provided on the outer periphery of the rear wall where the nozzle 2 is fixed. The tip is reduced in diameter in a stepped manner. Reference numeral 8 denotes an inner combustion cylinder provided at a reduced diameter portion in front of the nozzle 2 in the cylinder 6, and a central hole 9 through which the spray fuel oil passes in the center at the end on the nozzle 2 side.
Is formed, and a plurality of supply holes 11 for circulating combustion air supplied from the outer periphery inward are provided on the peripheral wall.

Further, around the center hole 9 of the flame holding plate 10,
A plurality of swirling blades 12 are formed in a fan-shape toward the inside of the inner combustion tube 8, and the swirling blades 12 are cut and raised at the same interval from the inside to the outside.
The air flowing from 3 is diverted into an axial, outward, and vertical swirling flow.

Numeral 14 denotes an auxiliary flame stabilizing plate superposed on the nozzle 2 side of the flame stabilizing plate 10. In the center, a suppression hole 15 smaller in diameter than the central hole 9 of the flame stabilizing plate 10 is formed. A flow hole 16 smaller than the cut-and-raised hole 13 is formed at a position opposite to the front end of the flame holding plate 10 to form a mixed flow portion which is a mixing region of fuel oil and combustion air that has just been sprayed. 17
Is provided.

Reference numeral 18 denotes an outer cylinder that covers the cylinder 6 and forms a secondary air flow passage 19 with the outer cylinder. Reference numeral 20 denotes an ignition means including an ignition electrode.

Next, the operation of this embodiment will be described. If the combustion start operation is performed now, the fuel oil pressurized from the oil supply passage 4 is supplied to the nozzle 2, and excess fuel oil other than the required combustion amount is returned via the return passage 5, and the required combustion amount is returned. The fuel is sprayed from the nozzle 2, and at the same time, the combustion fan 3 is driven to supply the combustion air, and the combustion is started when the ignition means 20 ignites the fuel.

The combustion air supplied at this time is first supplied to the cylinder 6
The secondary air circulating on the outer circumference and the primary air passing through the primary air hole 7 of the cylinder 6 are further diverted, and the primary air flowing into the cylinder 6 passes through the outer circumference of the inner combustion cylinder 8 and is inward from the supply hole 11. The air is divided into the supplied combustion air and the air directed to the flame holding plate 10.

The air directed to the flame holding plate 10 is
Combustion air flowing through the suppression hole 15 and the central hole 9 together with the spray fuel, and flowing through the flow hole 16 and the cut-and-raised hole 13 and guided by the swirler vanes 12, are swirled in the inner circumferential direction, the inner wall direction and the axial direction. The air flowing toward the axis is also subjected to the suction force of the spray fuel oil at the mixing portion 17 and is mixed with the fuel oil immediately after spraying. The combustion air can be instantaneously mixed in the mixing section 17 of the above, and good combustion can be obtained.

In addition to the small thermal combustion, the combustion air is supplied to the mixing section 17 and then mixed while being swirled in the vertical direction of the inner circumference, and the air flowing toward the inner wall and the air from the supply hole 11 are merged. By supplying a large amount of air at the end of the inner combustion cylinder 8, sufficient combustion air can be always supplied and sufficient combustion can be performed. Therefore, it is possible to reduce the amount of small thermal combustion as much as possible, and as a result, it is possible to provide a gun type burner which has a wide range of variable thermal power and is easy to use.

[0016]

In short, the present invention comprises a cylinder 6 having a nozzle 2 inside and a primary air hole 7 at the rear of the nozzle 2 and a spray fuel oil combustion inside the cylinder 6 in front of the nozzle 2. In the case where the inner combustion cylinder 8 is provided, the inner combustion cylinder 8 has a central hole 9 at the center on the nozzle 2 side. A plurality of swirling blades 12 cut and raised at equal intervals from inside to outside
And a suppression hole 15 smaller in diameter than the central hole 9 on the windward side of the flame holding plate 10, and a rotating blade 1.
2 is formed by superimposing the flame holding plate auxiliary 14 which is opposed to the cut-and-raised hole 13 and has a smaller flow hole 16, and a plurality of supply holes 11 are provided on the peripheral wall of the inner combustion cylinder 8.
Good combustion air is supplied even during small thermal combustion, good combustion can be obtained at all times from small thermal to large thermal combustion, and a gun type burner with a wide range of variable thermal power can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gun-type burner to which the present invention is applied.

FIG. 2 is an enlarged sectional view of the main part.

FIG. 3 is an exploded perspective view of the main part.

[Explanation of symbols]

 2 Nozzle 6 Cylinder 7 Primary air hole 8 Inner combustion cylinder 9 Center hole 10 Flame holding plate 11 Supply hole 12 Rotating blade 13 Cut-and-raise hole 14 Disk holding plate auxiliary 15 Suppression hole 16 Flow hole

Continuing on the front page (72) Inventor Yoshikata Uchiyama 7-7 Higashi Shinbo, Sanjo-shi, Niigata Prefecture Corona Inc. 56) References JP-A-63-135704 (JP, A) JP-A-4-73708 (JP, U) JP-A-58-32219 (JP, U) JP-A-1-20504 (JP, Y2) (58 ) Surveyed field (Int.Cl. ⁶ , DB name) F23D 11/24

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylinder 6 having a nozzle 2 inside and a primary air hole 7 at the rear of the nozzle 2;
The inner combustion cylinder 8 for spray fuel oil combustion is provided in front of the nozzle 2 in the inside.
A flame holding plate having a central hole 9 at the center and a plurality of swirling blades 12 formed at equal intervals from the inside to the outside so as to apply a swirling force to the primary air flow on the outer periphery of the center hole 9. 10
Further, on the windward side of the flame holding plate 10, a suppression hole 15 having a diameter smaller than that of the center hole 9, and a flame holding plate formed with a flow hole 16 opposed to the cut-and-raised hole 13 of the swirling blade 12 and smaller than this. A gun type burner characterized in that the auxiliary (14) is superposed and a plurality of supply holes (11) are provided on the peripheral wall of the inner combustion cylinder (8).