JPS636581Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to an improvement in a surface combustion burner device that has a combustion plate made of wire mesh or ceramic plate, sucks primary air using a mixing tube, and performs combustion.

Conventional construction and problems thereof Conventional surface combustion burners using wire mesh or ceramic plates have the construction as shown in FIGS. 5 and 6. In the figure, 1 is a mixing tube, and a mixture chamber 2 is provided at the tip thereof. A combustion plate 3 made of wire mesh is stretched over the open surface of the mixture chamber. When fuel is ejected from a nozzle 4 provided at the entrance of the mixing tube 1, surrounding air is also sucked in, forming a mixture and leading to the mixture chamber 2. Since the equivalence ratio of this air-fuel mixture is close to 1, the flame during combustion is short and the combustion occurs almost near the surface of the wire mesh combustion plate 3. Therefore, the combustion plate 3 is heated by radiation from the flame and becomes red hot. At the same time, the red-hot combustion plate 3 forms a high-temperature field, which has the synergistic effect of further promoting combustion, resulting in surface combustion. However, in a surface combustion burner having this type of structure, an appropriate combustion amount is determined depending on the area of the combustion plate 3 in order to exhibit the synergistic effect as described above. If this proper combustion amount is exceeded, the combustion plate 3 will exceed its high temperature limit (usually about 1000°C), and there is a great danger that the flame will backfire and damage the burner. On the other hand, if the amount of combustion is less than the appropriate amount, the combustion plate 3
As the surface temperature of the fuel decreases and combustion is suppressed, harmful substances such as CO or aldehydes are generated. Therefore, in the surface combustion burner of the conventional structure, the range of the appropriate combustion amount is narrow, and there is a drawback that the combustion amount cannot be narrowed down. Therefore, the combustion amount had to be changed using two burners of the same type, or one with a large capacity and one with a small capacity, which had the disadvantage of increasing manufacturing costs when used in stoves and the like. Further, in this switching method, each burner requires a sensor (for example, a misfire detection sensor, an incomplete combustion prevention sensor, etc.) for monitoring the combustion state. Furthermore, the circuits that process the signals from these sensors are also complicated, and when used in a stove or the like in addition to the use of two burners, there is a drawback that the manufacturing cost increases.

Purpose of the invention The present invention aims to improve the above-mentioned conventional drawbacks, and aims to expand the combustion range of the burner by dividing the inside of a single burner with partition plates and switching the combustion area.

Structure of the invention In order to achieve this objective, the invention divides the mixing tube, mixing chamber, and combustion plate into two parts by a series of partition plates, and provides two fuel injection nozzles, one of which is divided into two by a series of partition plates.
One is provided on the center line of the mixing tube, and the other is provided inside one of the two divided mixing tubes, and a combustion detection sensor is provided on the upper part of the combustion surface connected to this mixing tube.

DESCRIPTION OF EMBODIMENTS A surface combustion burner device according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In these figures, the same members in FIGS. 5 and 6 are given the same numbers.

The burner consists of a mixing tube 1 and an air-fuel mixture chamber 2 connected to the mixing tube 1, as in the conventional case, and a combustion plate 3 made of wire mesh is attached to the opening surface of the air-mixing chamber. However, the difference in structure from the conventional one is that the mixing tube 1 and the mixture chamber 2 are divided into two by a partition plate 5, as is clear from FIG. 2, which is a sectional view seen from the top. This partition plate 5
Since the combustion plate 3 is also divided, the inside of the burner is divided into two parts.
The structure is divided into two spaces. There are also two fuel injection nozzles, and the main nozzle 4' is located near the entrance of the mixing tube and on the center line of the mixing tube. In addition, the sub-nozzle 4'' is inserted into the lower part of the mixing tube which is divided into two in Fig. 2.A flame rod 6 is also placed on the lower combustion plate.
is provided.

In the above configuration, when fuel is first injected from the main nozzle 4', air is sucked through the mixing tube as shown in FIG. In other words, in this state, the burner is fully open and full combustion is performed. At this time, even if there is a partition plate, air-fuel mixture having approximately the same mixing ratio flows in both spaces. Therefore, when using a combustion state detection sensor such as the flame rod 6, it is possible to always detect the combustion state of the entire surface of the combustion plate by installing it on one of the two combustion plates. Furthermore, when fuel is injected from the sub-nozzle 4'', the fuel still attracts the surrounding air, but after becoming an air-fuel mixture, it travels through one of the divided spaces and reaches one side of the combustion plate 3, where it is combusted. In this case, the burner burns partially, resulting in a small capacity.Thus, even though there is only one burner, by switching the combustion surface, the combustion amount can be switched to two stages.In addition, the burner has a small capacity. By providing a flame rod 6 on the combustion plate, the combustion state can be detected even in the case of a small capacity in the same way as in a large capacity.Therefore, a surface combustion burner device that can change the combustion amount with one burner and one flame rod can be made at a low cost. It can be provided to

Effects of the invention As described above, the present invention divides the inside of the burner and the combustion plate into two parts using a partition plate, and places one nozzle almost on the center line of the mixing tube and the other nozzle on the other divided mixing tube. Since it is provided internally, the combustion amount can be easily switched by simply switching these nozzles, and the switching ratio of the combustion amount can also be freely set by changing the division ratio of the combustion plates by the partition plate.

In addition, the combustion detection sensor is installed at the top of the combustion plate connected to the other mixing tube, which has the other nozzle installed inside, so it can easily detect combustion with just one sensor, regardless of whether the amount of combustion is large or small. . By the way, 1
Even with multiple burners and combustion detection sensors, it is possible to provide a burner that is inexpensive and whose combustion amount can be switched.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a surface combustion burner which is an embodiment of the present invention, Fig. 2 is a top sectional view of the same burner, and Fig.
The figure is a cross-sectional view showing the air-fuel mixture flow state when the burner is in full-open combustion, Figure 4 is a cross-sectional view showing the air-fuel mixture flow state when the burner is in small capacity combustion, and Figure 5 is a cross-sectional view showing the air-fuel mixture flow state when the burner is in full-open combustion. The external perspective view and FIG. 6 are top sectional views of the burner. 1... Mixing pipe, 2... Mixture chamber, 3... Combustion plate, 4... Nozzle, 5... Partition plate.

Claims (1)

[Scope of utility model registration request] A mixing tube, a mixture chamber, a combustion plate having small holes, a wall of the mixing tube, a wall of the mixture chamber, the combustion plate, and a partition plate form two mixture passages and a combustion surface. Equipped with a divided burner, two fuel injection nozzles, and one combustion detection sensor,
One of the nozzles is provided at the inlet of the mixing tube and approximately on the center line, and the other nozzle is provided inside the other divided mixing tube, and the combustion detection sensor is provided on the upper part of the combustion plate connected to the other mixing tube. A surface combustion burner device equipped with