JPS609550Y2 - Bernahed - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a burner head such as a vaporized liquid fuel combustion device.

The burner head as described above has a burner plate with a large number of burner teeth protruding radially from the end surface of an annular plate, and a mixture of fuel gas and air is ejected from between the burner teeth, Types that burn this air-fuel mixture on the outer peripheral side of the burner port plate are generally used.

Conventionally, in such a burner head, an air permeable backfire prevention cylinder made of wire mesh, perforated metal plate, etc. is fixed to the inner circumferential surface of the burner port plate by an attachment part.

However, conventional burner heads that have a packfire prevention tube that is separate from the surrounding wall of the vaporization chamber require a large number of parts to install the packfire prevention tube and the packfire prevention tube to the flame spout plate. The height of the fire prevention tube is the actual height of the Koko Showa 4.
There was a problem in that it was large and had low rigidity in the axial direction, such as the one shown in Publication No. 7-916.

This invention solves the above-mentioned problems and can be attached to the components of the vaporization chamber with a relatively small number of parts, and also securely fixes the backfire prevention tube to the annular plate of the burner port plate with good workability. It is an object of the present invention to provide a burner head which can be used for a long period of time and has high rigidity in its burner teeth and backfire prevention cylinder.

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

FIG. 1 shows the main body of a vaporized liquid fuel combustion device used in an instantaneous water heater.

In FIG. 1, 1 is the vaporization chamber, 2 is the peripheral wall of the vaporization chamber 1,
A burner head 3, which will be described later, of a burner 4 according to an embodiment of the invention is supported on a step 2a provided on this peripheral wall 2.

It is inserted into the primary air supply lower provided by penetrating the peripheral wall 2,
The tip of the fuel nozzle 5 that communicates with an oil level regulator (not shown) faces into the vaporizing chamber 1, and a combustion air passage 6 forcibly blown by a blower (not shown) is formed surrounding the outer periphery of the peripheral wall 2. Primary air is blown into the vaporization chamber 1 from around the fuel nozzle 5 via the supply lower, so that liquid fuel such as kerosene is sprayed into the vaporization chamber 1 from the nozzle 5.

Since the peripheral wall 2 of the vaporization chamber 1 is preheated by the preheater 8 embedded therein, the liquid fuel sprayed into the vaporization chamber 1 collides with the peripheral wall 2, is vaporized, and mixed with the primary air. The mixture is sent to the burner head 3 and ejected from its outer periphery.

From the lower end of the air blowing passage 6, the inside of the central cylinder 9 which is formed integrally with the bottom of the peripheral wall 2 and passes through the vaporizing chamber 1 in the axial direction, and the upper end of the burner head 3 and the flow regulator 10 installed above it are connected. Secondary air is supplied from the inner circumferential side of the burner head 3 toward its outer circumferential direction through the space between the burner head 3 and the upper end of the air passage 6 to the upper end of the peripheral wall 2 and the air guide plate 1 installed above it.
1, secondary air is also supplied from the outer circumferential side of the burner head 3 toward its inner circumferential direction.

Then, the air-fuel mixture ejected from the outer periphery of the burner head 3 is ignited by the ignition means 12 mounted on the peripheral wall 2 facing the burner head 3, so that the air-fuel mixture is combusted using the secondary air. It has become.

Note that after the combustion starts, the vaporization chamber 1 is also heated by a part of the combustion heat.

In the burner head 3, an annular base plate 13 is supported on a step 2a of the peripheral wall 2 of the vaporizing chamber 1, and a burner port plate 14 installed on the base plate 13 is connected to a restraining plate screwed into the center cylinder 9. 1
5 is fastened to the step 2a together with the substrate 13.

As shown in FIGS. 1 to 3, the flame spout plate 14 is a one-piece piece made of aluminum or the like that is ground and has a large number of flame teeth on the outer periphery of both upper and lower end surfaces of the annular plate 16. 17 are integrally protruded radially at predetermined intervals, and the flame teeth 1 on the upper end surface
7 and the flame teeth 17 on the lower end surface are arranged in a staggered manner.

Notches 18 are formed in the mouth teeth 17 at portions close to the inner periphery of the mouth plate 14 in the radial direction, and these notches 18 are arranged in a broken line ring shape.

In addition, a portion 17a of the flame mouth tooth 17 on the inner circumferential side of the notch 18 is formed to be slightly lower in height than a portion 17b on the outer circumferential side.

A backfire prevention tube 19 made of stainless steel wire mesh is fitted and supported in the notch 18, and this backfire prevention tube 19 connects the portions 17a of the plurality of flame opening teeth 17 on the inner peripheral side of the notches 18 to the flame opening. By applying an external force to the plate 14 from the inner circumferential side to the outer circumferential side to plastically deform the plate 14, the plate 14 is caulked and fixed to the flame port plate 17.

The burner head 3 configured as described above passes from the vaporizing chamber 1 through the substrate 13 and between the inner circumferential surface of the burner port plate 14 and the outer circumferential surface of the center cylinder 9, and between the burner teeth 17 of the burner port plate 14. Flame plate 14
A mixture of fuel gas and primary air is ejected to the outer circumferential side of the
The air-fuel mixture is combusted between the outer peripheral surface of the flame port plate 14 and the inner peripheral surface of the peripheral wall 2, and backfire is prevented by the backfire prevention tube 19.

In this invention, the backfire prevention cylinder 19 may be made of a porous metal plate instead of the wire mesh.

As explained above, according to the burner head according to this invention, the annular substrate 1 is attached to the step 2a at the upper end of the peripheral wall 2 of the vaporization chamber 1.
3, a burner port plate 14 is installed on the base plate 13, and the center cylinder 9 formed integrally with the bottom of the peripheral wall 2 is passed through the base plate 13 and the burner port plate 14 with a gap therebetween. Since the substrate 13 and the burner port plate 14 are clamped to the step 2a of the peripheral wall 2 by the retaining plate 15 screwed into the upper end of the vaporizing chamber 1, the The base plate 13, the flame outlet plate 14 having the backfire prevention cylinder 19, and the restraining plate 15 can be assembled without using separate parts for fixing them, and the flame outlet plate 14 is provided on the upper and lower end surfaces of the annular plate 16. The backfire prevention tube 19 is fitted into the notch 18 arranged in a broken line ring shape in the flame spout teeth 17, and by deforming the portion 17a of the flame spout teeth 17 on the inner circumferential side from the notch 18, the backfire prevention tube 19 is inserted into the flame spout. Portion 1 on the outer peripheral side of the notch 18 of the tooth 17
7b, there is no need for a separate part for fixing the backfire prevention tube 19, and moreover, with the backfire prevention tube 19 fixed to the annular plate 16, the backfire prevention tube 19 can be fixed as described above. Coupled with the ability to assemble the burner head, the overall assembly and the assembly of the burner port plate 14 can be performed with good work efficiency, and can be provided at low cost.

In addition, according to this invention, the flame spout teeth 17 and the backfire prevention part 19 provided on the annular plate 16 of the flame spout plate 14 are divided into upper and lower parts, so that the total height and axial length of these can be reduced. If the height of the flame spout formed between the flame spout teeth is the same as that of a case where flame spout teeth are provided only on one of the upper and lower surfaces, height is 1
72, these strengths, especially the rigidity in the axial direction, can be increased, and a burner head that can withstand long-term use can be provided.

Furthermore, according to this invention, the notch 18 of the flare tooth 17 is arranged on the inner peripheral side of the annular plate 16, and the radial length of the portion 17a on the inner peripheral side of the notch 18 is shortened, so that caulking, etc. The inner circumference side part 17a can be easily changed, and since the height of the inner circumference side part 17a is lower than the outer circumference side part 17b, when the inner circumference side part 17a is deformed by caulking etc. , the inner circumference side portion 17a rarely closes or narrows the burn mouth of the burn mouth tooth 17, and even if the inner circumference side portion 17a protrudes upward due to deformation, the outer portion 17b
Therefore, the flame outlet plate 14 can be sandwiched between the base plate 13 and the holding plate 15 without any gap, and both the fixation of the backfire prevention tube 19 to the annular plate 16 and the sandwiching of the flame outlet plate 14 are ensured. This has the effect of being able to do this.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an example of a vaporized liquid fuel combustion device equipped with a burner head according to an embodiment of this invention, Fig. 2 is an enlarged plan view of a flame port plate, and Fig. 3 is a cutaway of the same part. FIG. 3...burner head, 14... burner mouth plate, 16... annular plate, 17... burner mouth teeth,
18...notch, 19...backfire prevention tube. Note that the same reference numerals in the figures indicate the same parts.

Claims (1)

[Scope of utility model registration request] An annular substrate 13 is supported on the step 2a at the upper end of the peripheral wall 2 of the vaporization chamber 1. A burner port plate 14 is installed on the substrate 13, and a center tube 9 formed integrally with the bottom of the peripheral wall 2 is attached to the substrate 13 and the burner port. Board 14
The substrate 13 and the burner port plate 14 are fixed to the step 2a of the peripheral wall 2 by a holding plate 15 which is passed through the center tube 9 with a gap therebetween and screwed into the upper end of the center tube 9. A large number of solenoid teeth 17 are made to protrude radially from the upper and lower end surfaces, and notches 18 are formed on the radially inward side of these solenoid teeth 17.These notches 18 are arranged in a ring shape with a broken line, and 1
The height of the part 17a on the inner peripheral side of the notch 18 of 7 is lower than the height of the part 17b on the outer peripheral side, and the backfire prevention cylinder 19 fitted in the notch 18 is attached to the inner peripheral part 17a of the flame mouth tooth 17.
The burner head is characterized in that it is deformed and clamped onto the outer circumference side portion 17b.