JPH0241473Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a burner device such as a vaporizing oil combustor, such as a fan heater, and particularly to a burner device for reducing nitrogen oxides. This invention relates to a flame current detection mechanism in a device.

(Prior Art) Conventionally, there has been a trend toward cleaner exhaust gas in oil combustors, but even cleaner exhaust gas is required.

By the way, nitrogen oxides (NOx) are not generated in relatively low temperature combustion conditions, but in conventional burner devices, the flame opening is made of a metal net and the temperature is high, so NOx in the exhaust gas is tends to increase.

Therefore, it is conceivable to construct the flame mouth body of the burner device from a ceramic plate. That is, since ceramic has a large heat capacity and heat conduction is suppressed, the ceramic plate becomes relatively low temperature, thereby reducing NOx in the exhaust gas.

Furthermore, conventional burner devices have a structure in which a flame current sensor is provided to monitor the combustion state by utilizing the conductivity and rectification of the flame. However, in the ceramic burner described above, the flame current is extremely small because the ceramic material itself is an insulator. This also puts a limit on the minimum calories that can be burned, and compared to traditional internet burners, the minimum detectable calories are lower.
It increases by about 500Kcal/h.

(Problems to be solved by the invention) As mentioned above, in the conventional burner device in which the flame nozzle is made of a metal net, there is a problem in that the amount of NOx in the exhaust gas increases, and in order to solve this problem, When the flame nozzle body is made of a ceramic plate, there are problems in that the flame current for monitoring the combustion state becomes small, and the minimum combustion calorie must be increased in order to reliably detect the presence or absence of a flame.

The present invention was devised in consideration of the above circumstances, and is a burner device that can reduce nitrogen oxides in exhaust gas, increase the flame current for monitoring the combustion state, and reduce the minimum calorie burnt. The purpose is to obtain.

[Structure of the invention] (Means for solving the problem) The present invention provides a flame spout body in the opening formed on the upper surface of the burner body made of a conductive material, and a flame current sensor is installed above the flame mouth body. In the burner device, the burner body is formed of a ceramic plate, and the ceramic plate is held between a frame-shaped baffle plate made of a conductive material and a burner port plate from below and above, The full plate and the flame port plate are attached to the burner body by supporting them in contact with the burner body, and an electrode portion having a flame port portion is formed only at a position of the flame port plate facing the flame current sensor. .

(Function) In the burner device of the present invention, by using a ceramic plate with a large heat capacity as the flame nozzle, the ceramic plate is kept at a relatively low temperature during combustion, thereby reducing the generation of nitrogen oxides. Further, a flame current sensor is provided above the ceramic plate, and a flame port is formed at a position facing the flame current sensor on a burner plate made of a conductive material that is in contact with a burner body made of a conductive material. The combustion state is monitored by passing an electric current through the flame between the flame and the electrode section.
At this time, as described above, the electrode portion of the flame port plate made of a conductive material is opposed to the flame current sensor, thereby increasing the flame current and decreasing the detectable minimum burn calorie.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 is a burner body, and this burner body 1 consists of a pair of left and right metal burner plates 2 connected together, and a fuel supply part 3 in the lower part communicates with an ejection part 4 in the upper part between the pair of burner plates 2. and this spout part 4
An elongated opening 5 is formed along the upper surface, and a flange portion 6 is bent along the inside of the upper end of the opening 5. Also, facing these flange portions 6, the pair of burner plates 2
A stepped portion 7 that expands upward is formed on the inner side of the
A groove portion 8 is formed between the flange portion 6 and the step portion 7.

Further, in the burner body 1, an auxiliary baffle plate 11 is spot-welded to one side of the inner surface of one of the burner plates 2, and an electrode support 12 is spot-welded to one side of the outer surface of the other burner plate 2. has been done.

Reference numeral 16 denotes a metal buttful plate, which is formed into an elongated frame shape having a flange portion 18 along the inside of the lower end of the peripheral wall portion 17 . And this Batsuful board 1
A plurality of engagement pieces 19 are formed by cutting and raising the lower portions of both sides of 6 .

Reference numeral 21 denotes an elongated ceramic plate serving as a burner mouth body, and a large number of small holes 22 are formed through the ceramic plate 21 in the vertical direction.

Reference numeral 26 denotes a metal flame port plate, which is formed into a frame shape by a peripheral wall portion 27 and an upper plate portion 28. An electrode part 30 having a plurality of slit-shaped flame ports 29 is formed on one side of the upper plate part 28, and an elongated rectangular hole part 31 is formed on the other side of the electrode part 30. is formed with an opening. Further, a plurality of engagement grooves 32 are formed in the lower portions on both sides of the peripheral wall portion 27 of the flame port plate 26 .

Then, the ceramic plate 21 is fitted into the baffle plate 16, and the buffle plate 16 is fitted into the burner port plate 26, and the burner port plate 2 is fitted.
The engagement piece 1 of the buff full plate 16 is inserted into the engagement groove 32 of 6.
By bending and engaging the flame outlet plate 26 and the full plate 16,
The ceramic plate 21 is held between the flame port plate 26 and the baffle plate 16. Next, the burner plate members 2 are joined together while the burner plate 26 is fitted into the grooves 8 of the burner plate members 2.
In addition, in this state, the burner body 1 and the burner port plate 26
The baffle plates 16 are brought into contact with each other and electrically connected.

Further, an insulator 37 supporting a flame current sensor 36 serving as an electrode is fixed to the electrode support 12 fixed to the burner body 1 using a support fitting 38. In this state, the flame current sensor 36 is closely opposed to the electrode portion 30 of the flame port plate 26 from above.

Next, the operation of the above configuration will be explained.

As shown in FIG. 3, fuel is transferred from a fuel tank 41 by an electromagnetic pump 42 to a vaporization pipe 47 having a heater 46 of a vaporizer 45 via an oil supply pipe 43.
There, the gas is vaporized and ejected from the nozzle 48 to the fuel supply section 3 of the burner body 1. Note that the gas vent pipe 49 between the nozzle 48 and the fuel tank 41 is shut off by a solenoid valve 50. At the same time, as shown by the arrow, combustion air is introduced into the fuel supply section 3 of the burner body 1, mixed, and guided to the ejection section 4 through the ceramic plate 21 to the flame nozzle of the flame nozzle plate 26. The fuel is ejected from the fuel cells 29 and 31 and ignited by the spark from the spark plug 51, causing continuous combustion.

The baffle plates 11 and 16 rectify and evenly distribute the mixed gas of vaporized fuel and combustion air.

Since the burner is made of a ceramic plate 21 having a large heat capacity, the temperature of the ceramic plate 21 during combustion is relatively lower than that of the metal burner. Therefore, it is possible to suppress the generation of nitrogen oxides (NOx). For example, with conventional NetBana, NOx
It was 7ppm, but in the ceramic burner of this example, it was 4ppm, a reduction of about 40%.

Further, as described above, the combustion flame is formed by the flame port plate 26, the flame port portion 29, and the ceramic plate 21 facing the square hole flame port portion 31 of the flame port plate 26. This flame opening part 2
The combustion state is determined by the current flowing between the electrode portion 30 of the flame port plate 26 on which the flame nozzle 9 is formed and the flame current sensor 36 which is closely opposed to this electrode portion 30, that is, by detecting the flame current. Monitor.

At this time, as described above, the flame from the flame mouth part 29 is transmitted to the electrode part 30 which is close to and opposite to the flame current sensor 36.
Since it is in contact with the flame current, it is easy for the flame current to flow, and the current value can be increased. For example, the electrode section 30 described above
Compared to the case where the flame current sensor 36 is not provided and the flame current sensor 36 is directly opposed to the ceramic plate 21, more than twice the flame current can be obtained.

In addition, by obtaining such a large flame current, the detectable minimum burnt calorie can be reduced, and although the burner nozzle body is made of ceramic plate 21, it is different from the conventional burner whose flame nozzle body is a metal net. It is possible to set the minimum calorie burnt on the same level as the device.

[Effects of the invention] According to the invention, since the flame nozzle body is made of a ceramic plate, the temperature of the ceramic plate becomes lower during combustion, so that nitrogen oxides in the exhaust gas can be reduced. Since the electrode part was formed only at the position facing the flame current sensor of the flame nozzle made of a conductive material supporting the plate, a large flame current could be obtained even though the flame nozzle was made of a ceramic plate as mentioned above. Therefore, the minimum calorie burn can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the burner device of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is an explanatory view thereof. 1... Burner body, 5... Opening, 16... Bumpy plate, 21... Flame mouth body (ceramic plate),
26...flame port plate, 29...flame port part, 30...electrode part, 36...flame current sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] A burner body made of a conductive material and having an opening on the top surface, a burner body provided in the opening of the burner body, and a flame current disposed above the burner body. and a sensor, the burner port body is made of a ceramic plate, and the ceramic plate is sandwiched between a lower buttful plate and an upper burner port plate each formed into a frame shape of a conductive material and supported in contact with the burner body. A burner device characterized in that an electrode portion having a flame port is formed only at a position of the flame port plate facing the flame current sensor.