JPH0140979Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an all-primary air combustion type gas burner device that is applied to hot air heaters and other devices.

[Prior Art] Conventionally, this type of gas burner has been known to have a uniform plate, a shielding plate, etc. arranged therein to equalize the pressure in the mixing pipe of the combustion supply gas. (Jitsukai 49-12465
(No. 39-4571) However, these are provided to equalize the supply of mixed gas, and cannot prevent pressure changes in the combustion chamber from being transmitted to the mixing pipe. Ta.

[Problem to be solved by the invention] Therefore, the applicant of the present application has developed this kind of device, for example, Japanese Patent Application No. 59-24475 (Japanese Patent Application Laid-Open No. 60-169051).
As seen in the figure, there is a combustion plate on the upper surface having a large number of flame ports on the lower side of the combustion chamber, and a mixing chamber on the lower side thereof.
We have proposed a type that is equipped with an all-primary air combustion type gas burner consisting of a mixing tube connected to the lower side through an opening at the tip, but in such a type, when igniting, the exhaust gas in the combustion chamber The pressure once increases and the jet pressure of the air-fuel mixture guided through the flame port once decreases, which is repeated, causing the combustion flame to vibrate, and at this time, the flame port portion remains at a relatively low temperature. The disadvantage is that the combustion flame tends to lift and thus vibrate in the lifted state, creating combustion noise. In order to eliminate this inconvenience, it is conceivable to increase the ejection pressure, but this would require increasing the supplied gas pressure or increasing the air pressure, and there is a limit to increasing the gas pressure. In order to increase the air pressure, a larger blowing fan is used, which inevitably becomes relatively expensive.

[Means for Solving the Problems] The present invention includes a combustion plate 3 on the upper surface having a plurality of flame ports 2 on the lower side of a closed combustion chamber 1, a mixing chamber 4 on the lower side thereof, and an opening at the tip. an all-primary air combustion type gas burner 7 consisting of a mixing pipe 6 connected to this via a
In the mixing chamber 4, a flow path 4b extending along the inner wall surface 4a of the chamber 4 extending between the combustion plate 3 and the opening 5 is provided to protrude into the flow path 4b, so that when the exhaust pressure increases, A blocking plate 8 having a substantially U-shaped longitudinal section is provided to prevent the pressure from acting on the opening 5.

[Function] Considering the case where the exhaust pressure of the closed type combustion chamber 1 rises once upon ignition, this pressure passes through each flame port 2 of the combustion plate 3 on the lower side and flows into the flow path 4 on the lower side.
b, but this is prevented from being introduced into the opening 5 by hitting the blocking plate 8, which extends substantially over the entire surface of the flow path 4b and has a substantially U-shaped longitudinal section. The air-fuel mixture guided through the flame outlet 2 flows out as it is without being subjected to the pressure and is guided to each flame port 2. In other words, the air-fuel mixture is ejected as it is through each flame port 2, and thus there is no vibration of the combustion flame due to a drop in ejection pressure, and therefore no generation of combustion noise.

[Effect] The vertical cut surface of the opening 5 at the tip of the mixing tube 6 and the combustion plate 3 above the opening 5 has a substantially U-shape that projects into the flow path 4b along the inner wall surface 4a of the chamber 4. A blocking plate 8 is provided to prevent the pressure from entering into the mixing pipe over substantially the entire lower part of the burner flame port 2 when the exhaust pressure increases. Therefore, it is possible to eliminate the generation of combustion noise associated with this.

[Example] Fig. 1 shows an example of a warm air heater to which the present device is applied. In this case, the combustion chamber 1 constitutes a heat exchanger in the heater body 9, and the Inside the main body 9, a warm air fan 10 is provided on the upper side thereof,
Thus, when the fan 10 is operated, indoor air enters through the inlet 12 on the lower back of the main body 10, is heated, and then flows out from the outlet 12 on the lower front of the main body 9, repeatedly. I made it possible to do so. Incidentally, the burner 7 functions as an all-primary air combustion type in which primary air for combustion is introduced through a blower fan (not shown) in the mixing pipe, and gas is guided through a gas pipe (not shown). It is not particularly different from what was proposed earlier.

According to the present invention, as described above, the blocking plate 8 having a substantially U-shaped longitudinal section is provided in the mixing chamber 4, for example, as clearly shown in FIGS. 2 to 4, i.e. The mixing tube 6 extends relatively longitudinally from one end of the lower side of the mixing chamber 4 to the vicinity of the other end, and is connected to the lower surface of the combustion plate 3 in front of the opening 5 at the tip thereof. A flow path 4b extending along the inner wall surface 4a is formed, and the blocking plate 8 is provided to protrude from the inner wall surface 4a into the flow path 4b. still,
The blocking plate 8 is, for example, as shown in FIG.
A.

[Brief explanation of the drawing]

Fig. 1 shows an example of the implementation of the present invention; Fig. 2 is a cutaway side view, Fig. 2 is an enlarged cutaway front view of the main parts, Fig. 3 is a cross-sectional view taken along the - line, and Fig. 4 is the same as Fig. 2. FIG. 5 is a sectional view taken along the line ``--'' and FIG. 5 is an oblique view of the blocking plate. 1... Combustion chamber, 2... Flame port, 3... Combustion plate, 4
...Mixing chamber, 5...Opening, 6...Mixing tube, 7...
Gas burner, 8... Blocking plate, 4a... Inner wall surface, 4
b...Flow path.

Claims (1)

[Scope of utility model registration request] At the bottom of the closed combustion chamber 1, there is a combustion plate 3 on the upper surface having a large number of flame ports 2, and a mixing chamber 4 below the combustion plate 3.
and a mixing tube 6 connected to this via the opening 5 at the tip.
A flow path 4b extending between the combustion plate 3 and the opening 5 and extending along the inner wall surface 4a of the chamber 4 in the mixing chamber 4; A gas burner device comprising a blocking plate 8 having a substantially U-shaped longitudinal section and protruding inward to block the action of exhaust pressure on the opening 5 when the exhaust pressure increases.