JPH0531375Y2 - - Google Patents

Description

[Detailed description of the invention] <Field of industrial application> The present invention is a gas burner used in a partially premixed gas combustion device that performs combustion by supplying secondary air to a mixture of fuel gas and primary air. This relates to a device having a plurality of vertical throat portions which are arranged in parallel at appropriate intervals and through which fuel gas and primary air are supplied to the flame hole surface.

<Conventional technology> Conventionally, this type of gas burner, for example,
As disclosed in Japanese Patent No. 62-56923, the flame hole surface and the mixing path following it are formed in a T-shape, and a throat portion is formed to expand at the lower end of this mixing path, and the fuel gas is introduced into the throat portion. There are some types that eject primary air to draw in the primary air supplied to the vicinity of the throat part by ejector action, mix both of them in a mixing path, and eject the mixture from the flame hole surface.

In addition, as disclosed in Japanese Patent Publication No. 59-34923, the throat portion is arranged eccentrically to one side of the longitudinal direction of the burner hole surface, and the mixing path is bent and its upper end is arranged in the longitudinal center position of the burner hole surface, thereby increasing the mixing distance without increasing the height of the burner.

<Problem to be solved by the invention> However, in the former case, in order to improve the mixing performance of fuel gas and primary air, a longer mixing path is required in such a conventional gas burner. There is a problem in that the entire burner becomes taller, and as a result, the gas combustion apparatus becomes larger in the vertical direction, and if the height of the burner is lowered to solve this problem, there is also a problem in that the mixing performance deteriorates.

Also, in the latter case, the fuel gas and primary air simply move along a curved mixing path;
These cannot be mixed sufficiently, and an insufficiently mixed gas flow is ejected from the flame hole, and the air-fuel mixture is supplied from the upper end of the mixing path to the longitudinal center of the flame hole surface. Since the diagonally upward dynamic pressure cannot be suppressed, a directional gas flow is ejected diagonally upward from the flame hole, and as a result, there is a problem in that combustion efficiency cannot be improved.

In view of these conventional circumstances, the purpose of this invention is to improve the mixing performance of fuel gas and primary air while lowering the height of the burner, and to eject a gas flow with vertical directionality from the flame hole. shall be.

<Means for solving the problem> The technical means adopted by the present invention to solve the above problem is to arrange a throat portion eccentrically to one side in the longitudinal direction of the burner hole surface, form a vertical portion of a mixing passage continuing from the throat portion in a direction perpendicular to the burner hole surface, form a downwardly sloping portion that bends from the end of this vertical portion on the burner hole surface side and extends obliquely away from the burner hole surface as it approaches the longitudinal center of the burner hole surface, and form a bag reservoir portion near the tip of the downwardly sloping portion so as to protrude towards the other longitudinal direction of the burner hole surface, and form a throttle portion at the longitudinal center position toward the burner hole surface from the tip of the downwardly sloping portion and the bag reservoir portion on the burner hole surface side.

It is preferable that the bag reservoir portion gradually shrinks in the direction perpendicular to the flame hole surface as it goes toward the other longitudinal direction of the flame hole surface.

<Function> According to the technical means of the present invention, the fuel gas and primary air entering the mixing path from the throat part are
Mixing of fuel gas and primary air is promoted by bending from the end of the vertical part on the side of the flame hole surface and guiding it diagonally away from the flame hole surface along the downwardly inclined part. A part of it flows from the tip of the bag into the bag reservoir, where it is mixed and promoted, and is reversed towards the flame hole surface, and the flow from this bag pool and the direct flame hole from the tip of the downward slope. The flow toward the surface is an opposing flow, and there is no separation between these two flows, and the flows directly contact each other.
The mixture is further promoted by converging, and then by narrowing the flow path at the constriction part, mixing is promoted, and at the same time, the dynamic pressure is killed and changed to static pressure, which has a directionality perpendicular to the flame hole surface. A gas flow is created.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

In this embodiment, as shown in Fig. 1, a gas burner A is constructed by bending a single metal plate by press forming, with the flame hole surface 1 facing upward and the throat portion 3 facing downward. The explanation will be given in the arranged state.

The gas burner A defines a space A ₁ extending inwardly in the upper part in the transverse direction, and a flame hole surface ₁ in which a large number of flame holes 1 a are opened in the upper surface of the space A 1 is formed in the shape of a flat band. , a tubular mixing path 2 is connected to the lower surface of the space A ₁ , and a throat portion 3 is formed to expand at the lower end of the mixing path 2.

The throat portion 3 is arranged eccentrically in either direction in the longitudinal direction of the flame hole surface 1, and
A gas supply nozzle C ₁ of a gas manifold C, which will be described later, is arranged perpendicularly to the center of the opening end.
Place and fix on top.

The mixing path 2 forms a vertical portion 2 a continuous with the throat portion 3 , and the inner diameter of the vertical portion 2 a gradually narrows upward, and is bent from its upper end to form a vertical portion 2 a. A descending slope portion 2b is formed that extends linearly diagonally downward toward the center in the longitudinal direction, and a bag reservoir portion 2c is located near the lower end of the downward slope portion 2b on the other side in the longitudinal direction of the flame hole surface 1, that is, the throat portion 3. It forms a protrusion towards the opposite side.

The bag reservoir portion 2c is gradually reduced in the vertical direction toward the other longitudinal direction of the flame hole surface 1.

The lower end of these descending slope portions 2b and the bag storage portion 2c
Above, a constriction part 2d is formed at the center in the longitudinal direction toward the flame hole surface 1 to narrow the flow path, and as it goes from the constriction part 2d toward the flame hole surface 1 above, the flame hole surface 1 It communicates with the lower surface of the space _A1 while gradually expanding in the longitudinal direction.

Furthermore, a pair of convex portions 2 forming this constricted portion 2d
e and 2f are arranged at substantially the same height in the vertical direction, or the projections 2f on the other side in the longitudinal direction of the flame hole surface 1 are arranged slightly above the projections 2e on one side in the longitudinal direction.

Further, on the two side walls defining the space _A1 , a pressure equalizing chamber portion 4 is formed by recessing horizontally inward between the flame hole surface 1 and the throttle portion 2d.

Such gas burners A can be used as a gas combustion device by arranging a plurality of them in parallel at predetermined intervals. For example, as shown in _FIG . be installed in parallel.

The combustion chamber B is formed into a box shape with only the upper surface open extending in the direction in which the gas burners A... are arranged by four side plates and one bottom plate, and the gas burners A... are located on one longitudinal side of the bottom plate _B1 . Open a gas air inlet port _B2 at a position corresponding to each throat portion 3 of the
A rectifying section _B3 is formed on the other side in the longitudinal direction.

The above gas air inlet port _B2 ... is connected to the throat portion 3...
The gas manifold C is formed in the same shape as the opening end of the combustion chamber B, and below the gas manifold C is installed horizontally along the longitudinal direction of the combustion chamber B at an appropriate interval. Gas supply nozzles C ₁ are provided to protrude toward the inlets B ₂ .

In addition, the bottom plate B ₁ with gas air inlet B ₂ ...
The lower surface of the damper D is bent into an inverted L shape.
is removably attached to the damper D, and by drilling an adjustment hole _D1 smaller than the inner diameter of the gas air inlet _B2 in this damper D, the primary air flow rate supplied to the gas burner A can be adjusted according to the type of gas. adjust.

That is, a plurality of types of dampers D having different diameters of adjustment holes _D1 are prepared in advance, and a damper D having a diameter suitable for the type of gas is selected from these and installed.

On the other hand, the above-mentioned rectifying section B ₃ is composed of two rectifying plates placed horizontally in parallel with an appropriate interval, and both the upper and lower plates have a large number of secondary air supply holes B ₃₁ with different inner diameters.
_B32 ... are respectively opened so as not to overlap in the vertical direction, and an air supply chamber E is defined below.

The air supply chamber E is formed along the gas manifold C in the longitudinal direction of the combustion chamber B, has an outlet of the blower F connected to an appropriate position on the lower surface thereof, and has the damper D forming the side surface on the side of the gas manifold C. A large number of primary air supply holes _D2 ... are drilled in the vertical part of the pipe.

Combustion air supplied from the blower F into the air supply chamber E is uniformly supplied as primary air from the primary air supply hole D ₂ to each gas air introduction port B ₂ located above the gas manifold C. The _secondary air is uniformly supplied as secondary air from the secondary air supply holes B ₃₁ . . . B ₃₂ .

When the fuel gas is ejected from the gas supply nozzle C ₁ of the gas manifold C to the throat portion 3 , the gas burner A draws in the primary air supplied from the air supply chamber E and enters the mixing path 2 .

The fuel gas and primary air that entered the mixing path 2 are
Bent downward slope part 2b from the upper end of vertical part 2a
It is guided diagonally downward along the line to its lower end, thereby promoting mixing of the fuel gas and the primary air.

Subsequently, a portion of the fuel gas and primary air that have been guided to the lower end of the downwardly inclined portion 2b flow into the bag reservoir portion 2c as they are, are promoted to mix within the bag reservoir portion 2c, and are reversed upward. Bag storage part 2c
The flow from above and the flow rising directly from the lower end of the descending slope portion 2b are opposing flows, and there is nothing to separate these two flows, so they come into direct contact and merge, resulting in a mixture of fuel gas and primary air. is further promoted.

After that, by narrowing the flow path in the constriction part 2d, the mixing of the fuel gas and primary air is promoted, and at the same time, the dynamic pressure is killed and changed to static pressure, allowing the gas to flow vertically from the flame hole 1a... It also plays a role in creating flow.

Then, the air-fuel mixture is diffused and supplied from the throttle part 2d to the space _A1 , and further narrowed once in the equalization chamber part 4, so that it is evenly distributed over the entire flame hole surface 1 and vertically from the numerous flame holes 1a... Spray evenly.

In the above embodiment, the gas burner A is constructed of a single metal plate, but the present invention is not limited to this. For example, the gas burner may be separated into a burner body and a flame hole portion, and these may be constructed separately. Needless to say, it's a good thing.

<Effects of the Invention> Since the present invention has the above configuration, it has the following advantages.

The fuel gas and primary air that entered the mixing path from the throat part are bent from the end of the vertical part on the side of the flame hole and guided diagonally away from the flame hole surface along the downward slope. Mixing of the air is promoted, and then a part of the air flows from the tip of the downward slope into the bag sump, promoting mixing within the bag sump, and is also reversed toward the flame hole surface, causing the air to flow into the bag sump. The flow from the tip of the descending slope and the flow directly from the tip of the descending slope toward the flame hole surface are opposing flows, and there is nothing to separate these two flows, so they come into direct contact and merge, further promoting mixing. Then, by narrowing the flow path at the constriction part, mixing is promoted, and at the same time, the dynamic pressure is killed and changed to static pressure, creating a gas flow with a directionality perpendicular to the flame hole surface. While reducing the height of the burner, it improves the mixing performance of fuel gas and primary air, allowing a vertically oriented gas flow to be ejected from the flame hole.

Therefore, compared to conventional systems in which the fuel gas and primary air simply move along a curved mixing path, the gas combustion device can be made smaller in the vertical direction, and a sufficient gas flow for mixing can be directed vertically from the flame hole. can be ejected, improving combustion efficiency.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a gas burner installed in an embodiment of the present invention, and FIG. 2 is a reduced front view of the same with a portion cut away. A... Gas burner, 1... Flame hole surface, 2... Mixing path, 2a... Vertical part, 2b... Downward slope part,
2c... Bag reservoir portion, 2d... Squeezing portion, 3... Throat portion.

Claims (1)

[Claims for Utility Model Registration] (1) In a gas burner having a vertical throat portion which is arranged in parallel at appropriate intervals and through which fuel gas and primary air are supplied to the flame hole surface,
The throat portion is disposed eccentrically in either longitudinal direction of the flame hole surface, a vertical portion of the mixing path continuous with the throat portion is formed in a direction perpendicular to the flame hole surface, and the vertical portion is A descending slope section is formed that bends from the side edge of the flame hole surface and extends diagonally away from the flame hole surface as it goes toward the center in the longitudinal direction of the flame hole surface. It is characterized by being formed so as to protrude toward the other side in the longitudinal direction of the hole surface, and to be located closer to the flame hole surface than the tips of these downwardly sloping portions and the baggage portion, and to form a constricted portion toward the flame hole surface at the central position in the longitudinal direction. gas burner. (2) The gas burner according to claim 1 of the utility model registration, in which the reservoir portion is gradually reduced in the direction perpendicular to the flame hole surface as it goes toward the other longitudinal direction of the flame hole surface.