JPH02272216A - Forced burning gas burner - Google Patents

Abstract

PURPOSE:To resolve the flame lifting beneath the flame stabilizing plate and reduce the noise during the burning by equalizing the secondary air distribution in a constitution where burner units are arranged sideways in a suitable number in the burner casing. CONSTITUTION:Part of combustion air entering from under the burner casing 1 is made the primary air which is supplied to the gas inlet of respective burner units 4 to which a gas nozzle 32 is pointing, and the remainder of combustion air rises in the the burner casing 1 to become the secondary air, which enters the space between the burner units 4 which are arranged sideways and is caused to flow inwardly from the vertical slits 8 in the flame stabilizing plate 10 through an inclined pressure equalizer 28 of the secondary air distribution device. In this embodiment, the flame lifting can be prevented because the flame stabilizing effect is made available by a construction where the lower part of the flame stabilizing gas tracks 9 is separated from the vertical slits 8 by a barring member 31, and the ignition transfer to the adjacent gas burner units 4 can be ensured because the top of the flame stabilizing gas tracks is bent at right angle to the connecting flange side 19 so as to diffuse the gas flow sideways.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a forced combustion type gas burner used in domestic water heaters and bathtubs.

<Conventional technology> Forced combustion type gas appliances are generally used for household gas appliances such as water heaters and bathtubs, and are equipped with a fan to forcibly supply and exhaust combustion air. Are known.

This forced combustion type gas appliance is smaller in size and has higher performance than the natural exhaust type, and has become popular as a household gas appliance. In this case, the gas burner incorporated in this gas appliance has a structure in which a gas burner body having a slit flame hole is housed in a burner case.

<Problems to be Solved by the Invention> However, due to the demand for higher efficiency and smaller size of household gas appliances, when the gas burner bodies are arranged in a high density in order to increase the load on the gas burner, the problem arises due to a lack of secondary air. Red-fire combustion occurred, making it difficult to achieve stable combustion.

Recently, in order to improve the defects caused by lack of air, a mixing section for introducing primary air has been installed in the lower part, and a flame holding plate with a V-shaped cross section has been installed in the upper part for introducing secondary air from the outside. A forced combustion type gas burner has also been developed in which a large number of burner bodies are arranged horizontally inside the burner case, but this flame-holding plate requires a large amount of secondary air to be supplied throughout the upper and lower areas. On the contrary, the rising gas burns on the way to the upper end of the flame-holding plate, forming a flame only at the lower part, and the flame is unstable, which is also a cause of low frequency waves called bumps.

In addition, conventional gas burners have a structure in which flame holding plates separate adjacent gas burner bodies by a certain width or more, which causes poor flame transfer and makes it impossible to prevent ignition such as an explosion.

In addition, a particular problem with conventional gas burners is the various types of gas (city gas, 13A, 6C).

It cannot respond to changes in the combustion rate of propane gas, etc.).

In view of the above circumstances, the present invention solves the above problems by appropriately regulating the secondary air flowing into the flame stabilizing plate of the gas burner body, and by hooking and connecting the flame stabilizing gas road surface to the flange side. The purpose of this project is to provide forced combustion type gas burners.

<Means for Solving the Problems> In the present invention, combustion gas outlet ports are lined up in a straight line to form a row of flame holes, and a flame holding plate that widens upward is arranged around this row of flame holes. A plurality of single burners are housed in a burner case with a secondary air flow path so that the flame hole rows of each burner are parallel. A large number of vertical slit holes are arranged in parallel in the vertical direction, and a flame-holding gas road surface is formed between the vertical slit holes, and the lower part of the flame-holding plate has small pressure-equalizing passage holes and comb teeth. A separator consisting of an outer frame member and an inner frame member with hooked claws facing the slit vertical hole is provided, and further,
The lower part of the abutting flange formed by connecting the burner units in a case is connected to the pressure equalizing member of the secondary air distribution device with approximately the same thickness.

<Function> Due to the above configuration, a part of the combustion air flowing in from the bottom of the burner case is guided to the gas port of the burner unit facing the gas nozzle as primary air, and the rest of the combustion air is sent to the burner case. The internal air rises and becomes secondary air, which flows into each middle of the six horizontally arranged groups of bars, passes through the inclined pressure equalizing member of the secondary air distribution device, and flows inside through the vertical slit holes of the flame stabilizing plate. In this case, the inside of the flame stabilizing plate has a structure in which the lower part of the flame stabilizing gas road surface is separated from the slit vertical hole by a barring part, which provides a flame stabilizing effect, prevents the flame from lifting, and also prevents the gas from rising. The combustion is strengthened at the upper position, and the upper end of the flame-holding gas road surface is hooked to the butt flange side, so the gas flow spreads horizontally and the ignition of the adjacent svarna body is ensured. This is the result.

<Example> The present invention will be described below based on the drawings of the example.

Reference numeral 1 denotes a burner case having a rectangular casing, and a large number of flat gas burner bodies 4 are horizontally installed at the upper part of the burner case with a secondary air baffle plate 3 placed above the air inflow part 2 provided at the lower part thereof. This single gas burner body 4 has a gas port 5 at one end of the lower part, a bent type mixing part 6 connected to this, a flame hole surface 7 in the middle, and a large number of slit vertical holes 8 and a flame-holding gas road surface 9 at the top. Flame stabilizing plates 10 each having a V-shaped cross section and widening toward the end are alternately arranged vertically, and rectifying comb teeth 11 each having an upwardly U-shaped cross section are installed in the gap position of the flame hole surface 7 on the side surface. A separator 15 is disposed between an outer frame member 12 provided on the outer frame member 12 and an inner frame member 14 with hooked claws 13 inserted into the lower end of the vertical slit hole 8 which overlaps the outer frame member 12. In addition,
The inner frame member 14 and the outer frame member 12 are assembled into one part by fitting the protrusion y of the outer frame member 12 into the hole X of the inner frame member 14 using the elasticity of the outer frame member. and the hooked claws 13 of the inner frame member 14 are
When assembled into the gas burner body 4, it fits into the vertical slit hole 8, and together with its positioning, increases the assembly rigidity of the gas burner unit 4 (see FIGS. 6A and 6B). The gas burner body 4 is fixed by a guide slit 18 of the support frame plate 17 that fits into the burner case 1 from above the joining protrusion 16 which is a flap of the plate end of the flame stabilizing plate 1010 constituting the gas burner body 4. (see FIG. 7), and abutting flange portion 19 folded back in a U-shape at the upper end of the flame-holding plate 10.
together with one adjacent butt flange part, a holding groove with a notch groove 22 in the center provided at the upper end of the secondary air distribution device 21 installed in the gap 20 formed between the gas burner bodies 4°4. 23 and fix it. This secondary air distribution device 2
1 has a structure including a rectifying frame 27 having a punched metal member 24 on the lower surface and a honeycomb member 26 disposed therein, and inclined pressure equalizing members 28 on the left and right sides rising from the center. Further, the upper end of the flame-holding gas road surface 9 formed on the flame-holding plate 10 has a hook-folded large flag portion 2 facing toward the connection flange portion 19 side.
9, on both sides of which secondary air ports 8a continuous to the slit vertical holes 8 are located, and in the upper half of the flame-holding gas road surface 9, a plurality of small holes 30 for secondary air are further bored. . This butt flange portion 19 is a thin vertical frame having only the thickness of the hook-folded plate. Reference numeral 31 denotes a barring part bent on both sides of the flame-holding gas road surface 9, and a slit vertical hole 8 through which secondary air flows so that the gas rising on the flame-holding gas road surface 9 is combusted almost uniformly over the entire gas road surface. It is installed between the flame gas road surfaces 9. Reference numeral 32 designates a gas nozzle installed in an air chamber 34 formed on one side of the air inflow section 2 via a primary air rectifying plate 33, and the gas nozzle 32 has the same number as the gas burner body 4, and The gas inlet 5 of the gas burner body 4 faces the front air hole 35.

Next, to explain this effect, first, the air blown by the drive of the fan 36 attached to the lower end of the burner case 1 is
From the air inflow part 2, it passes through the secondary air rectifier plate 3 and flows upward to become secondary air, while the primary air rectifier plate 33 on the side
It becomes primary air that passes through and flows into the air chamber 32.

Here, the primary air that has flowed into the air chamber 34 flows into the gas population 5 of the gas burner body 4 together with the appropriate gas ejected from the gas nozzle 32, and flows into the mixing part 6 of the gas burner body 4.
From there, it flows through the rectifying small hole 37 at the bottom of the separator 15 and the gap a between the 1ffl teeth 11 to the left and right flame stabilizing plates 10 forming a V-shape (widening at the ends). On the other hand, the secondary air rising inside the frame of the burner case 1 through the secondary air straightening plate 3 is first introduced into the punched metal on the lower surface of the secondary air distribution device 21 set in the arrangement gap 20 of the horizontally arranged gas burner bodies 4. By the vertical flow of the aluminum honeycomb member 26 packed into the upper part from the hole 24! lt
F, secondary air is supplied to the flame stabilizing plate 10 of the gas burner body 4 by the inclined pressure equalizing member 28 which is located above the passage of the honeycomb member 26 and bulges on both sides. The air flows uniformly into the slit vertical hole 8, which is the air Q% supply/closing opening. In this state, the spark from the ignition plug 38 attached to one end of the upper part of the burner case 1 ignites the gas mixed with primary air rising on the flame-holding gas road surface 9 of the flame-holding plate 10 . The large hooked flag part 29 is connected to this ignition plug 3.
The ignition by the gas burner 8 immediately causes good transfer of the flame to the gas burner bodies 4 of each stage.

That is, in the gas burner body 4, the combustible gas that has passed through the mixing section 6 and the primary air are separated from each other by the notches 11. a, collides and decelerates, completely mixes gas and primary air, becomes combustion gas, and rises along the flame-holding gas road surface 9 of the flame-holding plate 10 from the gap a at the end of the notch 11a. In addition, this flame-holding plate 10
The secondary air flowing from the slit vertical hole 8 is mixed so as to be rectified by the burring surface 31, and flows upward, and
Since a predetermined amount of secondary air is obtained which flows directly from the secondary air small holes 30 further provided in the upper part of the flame-holding gas road surface 9 itself, stable combustion without red-flame combustion can be achieved throughout the flame-holding gas road. In other words, almost uniform safe combustion can be obtained over the entire surface of the flame holding plate 1o. In addition, since a continuous hooked igniter section 29 is connected to the upper end of this flame-holding gas road surface 9, the unburnt gas rising along the flame-holding gas road surface 9 is transferred to the hooked ignition section 29.
Since the combustion gas flows laterally along the flame, the flame spreads laterally as well, resulting in combustion. In this way,
The flame ignited at one end of the burner case immediately moves to the adjacent gas burner body 4, ensuring ignition. In addition, the abutting flange portion 19 at the end position (tip) of the hook-shaped sparking portion 29 is a thin plate having a structure of a plate having a predetermined width bent at a right angle, and is a part of the secondary air distribution device 21 that receives the abutting flange portion 19. The clamping groove 23 has a notched groove 22, and the secondary air from the notched groove 22 rises, so that the unburnt gas that has climbed up the flame-holding gas road surface 9 is sufficiently air-filled at this tip. It is possible to easily achieve complete combustion of the gas in the hooked ignition starter section 29. Therefore, it is desirable to provide a gas burner that can be used in common with various types of fuel gas currently in use. It is something.

<Effects of the Invention> As described above, the forced combustion type gas burner of the present invention has a configuration in which an appropriate number of burners are arranged in a burner case, and has a structure that equalizes secondary air division. During combustion, an inclined pressure equalizing member formed in the middle of the secondary air distribution device allows this secondary air to flow uniformly into the slit vertical holes of the flame stabilizing plate of the opposing burner, so the flame stabilizing plate There is no lifting of the flame on the lower side, and a combustion flame with significantly reduced noise during gas combustion is obtained. Moreover,
In this case, small holes for secondary air are provided only in the upper part of the flame-holding gas road surface, which is the passage for the combustion gas of the flame-holding plate, and the air supply at the tip of the flame-holding gas road surface is further increased. Since the fire bridging portion is formed, an efficient combustion flame can be obtained on the wall surface of the flame holding plate. In addition, the upper end of this flame-holding gas road surface has a hooked igniter, which ensures that the combustion gas spreads and burns, ensuring that the flame transfers to the adjacent gas burner body. It becomes easy to ignite a large number of gas burner bodies. In addition, this gas burner body has a large combustion area with a V-shaped cross section of a pair of flame holding plates on the left and right from the mixing part and the separator at the upper end, making it possible to completely burn various gases using the same burner. However, it is possible to cope with a high load on the gas burner.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing the main parts, FIG. 2 is a sectional view, FIG. B) is a slope view of the secondary air distribution device and a slope view seen from below, Figure 5 is a side view showing the arrangement combination of the secondary air distribution device and a single burner, and Figure 6A.
. B is a perspective view of the separator separated and a sectional view of the separator fitted;
FIG. 7 is an explanatory diagram of a support plate for a single burner. 1... Burner case, 4... Gas burner body, 6...
・Mixing part, 8... Slit vertical hole, 9... Flame holding gas road surface, 10... Flame holding plate, 11... Comb teeth, 12... Outer frame member, 13... Hooked claw , 14...inner frame member, 15
...Separator, 19...Butt flange part, 2
1... Secondary air distribution device, 22... Notch groove, 23
...Pinch receiving groove, 24...Punch metal surface, 26...
Honeycomb member, 28... Inclined pressure equalizing member, 29... Hooked ignition part, 30... Small hole for secondary air.

Claims (1)

[Claims] 1. The combustion gas outlet is arranged in a straight line to form a row of flame holes, and the burner itself is equipped with a flame-holding plate that spreads upward toward the center around this row of flame holes, and has a secondary air flow path. In a gas burner in which a plurality of gas burners are housed in a burner case so that flame hole rows of each burner are parallel, the flame stabilizing plate includes:
A large number of vertical slit holes for supplying secondary combustion air are arranged in parallel in the vertical direction, and a flame-holding gas road surface is formed between the vertical slit holes, and small passage holes for pressure equalization are formed at the bottom of the flame-holding plate. A separator consisting of an outer frame member having comb teeth and an inner frame member with hooked claws facing the vertical slit hole is provided, and the lower part of the butt flange portion formed by connecting the burner units in a row is provided. is a forced combustion gas burner characterized in that it is connected to a pressure equalizing member of a secondary air distribution device with approximately the same thickness.