JPH0335568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to household combustion appliances.

BACKGROUND ART As shown in FIG. 3, a conventional burner device of this type includes a burner 3 having a flame hole 2 at one end of a tube 1 having a certain distance, and a nozzle 4 at a position facing the flame hole 3. A primary air hole 5 is provided through the side of the burner 3 near the nozzle 4, and the suction of primary air from the primary air hole 6 is utilized by the ejector effect caused by the ejection of gas from the nozzle. The premixed gas is mixed in the tube 1 and a flame is formed in the flame hole 2 as a premixed gas.
Also, in the type that separates the flame (Fig. 4)
The burner device has an inner tube 3, an outer tube 7 is provided to separate the flame of the inner tube 3, and the inner tube 3 has a primary flame.
F1 was configured to form a secondary flame F2 in the outer tube 7.

Problems to be Solved by the Invention However, in the above configuration, in order to improve the mixing of gas and air, it is necessary to lengthen the tube of the inner tube and increase the resistance inside the tube to sufficiently develop the flow. Ta. In addition, the primary air hole is provided near the nozzle, penetrating the side surface of the tube in a direction perpendicular to the nozzle ejection direction, and the primary air hole, tube, and primary flame hole are symmetrical with respect to the gas ejection direction. Because of this, when the flow rate of gas coming out of the nozzle is small, the pressure balance on both sides immediately after ejection is lost, and the ejected gas adheres to the side of the tube.

As a result, the flame becomes extremely long and the primary air ratio is reduced. In actual burners, there are dimensional tolerances, and it is natural for the center of the nozzle to shift, and this will definitely cause adhesion phenomena, making it impossible to downsize the entire burner. When the burner is used to detect oxygen deficiency, as shown in Figure 2, there is a problem in that the primary flame extends longer than the position of the primary flame detection element, and it does not change much even when there is oxygen deficiency. .

The present invention solves such conventional problems,
The purpose is to eliminate adhesion of ejected gas to the tube, ensure a constant primary air ratio, and form a stable and short flame.

Means for Solving the Problems In order to solve the above problems, the burner device of the present invention includes an inner tube 3 having one end of the tube 1 having a certain distance as the primary flame hole 2, and the primary flame hole 2. a nozzle 4 facing the other end of the tube 1 facing the inner tube 3; a fixing part 5 for fixing the inner tube 3 and the nozzle 4; and an outer part separated from the primary flame hole 2 to form a secondary flame hole 6. A tube 7 is provided, and auxiliary air holes 8 and 9 for supplying limited secondary air to the outer tube 7 are provided on the side of the tube 1 near the nozzle 4 of the inner tube 3 at different distances from the nozzle 4. It has a configuration in which two primary air holes 10 and 11 are provided.

Effect The present invention has the above-described configuration, so that the gas ejected from the nozzle does not adhere to the tube, and a predetermined amount of air is sucked in and mixed through the primary air hole to form a stable flame in the primary flame hole. It will become.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In FIG. 1, an inner tube 3 with one end of the tube 1 serving as a primary air hole 2, and a nozzle 4 facing the other end of the tube 1 facing the primary flame hole 2 are shown.
and a fixing part 5 for fixing the inner tube 3 and the nozzle 4.
and an outer tube 7 that is separated from the primary flame hole 2 to form a secondary flame hole 6, and the outer tube 7 is provided with auxiliary air holes 8 and 9 for supplying limited secondary air. , two primary air holes 10 at different distances from the nozzle 4 on the side surface of the tube 1 near the nozzle 4 of the inner tube 3;
11 are provided. Also, this burner device has low
In addition to being used as a burner for NOx, it can also be used as a burner for oxygen deficiency detection. A primary flame detection element 13 (for example, a thermistor that detects temperature, a flame rod that detects thermocouple ion current, a light detection element that detects light, and an oxygen sensor that detects oxygen concentration) is inserted through the detector insertion hole 12 provided in the tube 7. etc.). In this case, the fixing part 5 is a fukuro nut, and a packing 15 is inserted between the nozzle 4 and the gas supply body 14, and the nozzle 4 and the packing 15 are fixedly sealed to the gas supply body 14 by the fukuro nut 5. ing. 1
5 is a filter, and 16 is a detection element stand.

In the above configuration, the gas is supplied to the gas supply body 14
It is supplied through the nozzle 4 and ejected into the tube. The gas coming out of the nozzle 4 flows through the primary air hole 1.
At the same time, air from the primary air hole 11 is sucked in with a slight time difference. At this time, if the air is sucked due to the above-mentioned suction time difference, the air becomes a swirling flow and uniformly mixes with the gas coming out of the nozzle while swirling. In this way, the gas and air reach a predetermined premixed state, and a short, stable premixed primary flame is formed in the primary flame hole, and the remaining unresolved components are transferred to the secondary flame together with the auxiliary air holes provided in the outer tube. It has the effect of forming a secondary flame in the holes.

Furthermore, by providing a primary flame detection element between the primary flame hole and the secondary flame hole, this burner device can be used as a burner for oxygen deficiency detection. That is, under normal conditions, the primary flame and the secondary flame are formed separately as described above, and the primary flame is short and stable, so the primary flame detection element can detect the primary flame. On the other hand, in the event of an abnormality such as oxygen deficiency, the primary flame extinguishes and moves to the secondary flame hole, so the primary flame detection element can detect the absence of the primary flame.

The same applies to the so-called normal Bunsen burner type, which has only an inner tube without an outer tube.
By providing a difference in the suction time of the secondary air, a swirling flow is generated inside the burner and a stable Bunsen flame is formed in the flame hole.

Effects of the Invention As explained above, according to the burner device of the present invention, the following effects can be obtained.

(1) Because the distances between the two primary air holes from the nozzle are different, the way the primary air is sucked is not symmetrical with respect to the center of the nozzle, but is sucked by rotating. Therefore, gas and air are mixed in a short tube, resulting in a burner device with low resistance inside the tube and a short length, making it easy to downsize the entire burner device.

(2) A stable conical flame is formed even when the gas flow rate is low, without the primary air ratio becoming extremely low or the flame becoming elongated due to adhesion to the inner wall of the pipe. In addition, by making the burner device a separate flame type with an inner tube and an outer tube, it can be used as a burner for detecting oxygen deficiency, but since there is no adhesion to the inner tube wall, under normal conditions a conical flame forms in the inner tube. On the other hand, when oxygen is deficient, it moves to the outer tube, so the range of change can be widened.

As is clear from the contents of (1) and (2), it is difficult to downsize a simple burner that uses a straight pipe from the nozzle to the flame hole as the mixing tube and flame hole. However, according to the present invention, by providing a difference in the suction time of the primary air, even a simple burner can be made. , it is possible to create a stable flame as a sufficiently compact burner device with normal dimensional tolerances.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a burner device according to an embodiment of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a sectional view of a conventional burner device, and Fig. 4 is a sectional view of another conventional example. It is. 1...Tube, 2...Primary flame hole, 3...Inner tube, 4...Nozzle, 5...Fixed parts, 6...Secondary flame hole, 7...Outer tube, 8, 9...Auxiliary Air hole, 1
0,11...Primary air hole.

Claims (1)

[Scope of Claims] 1. A burner comprising a burner having one end of a tube as a flame hole, a nozzle facing the other end of the tube opposite to the flame hole, and a fixing part for fixing the burner and the nozzle. A burner device that has two primary air holes at different distances from the nozzle on the side of the tube near the nozzle. 2. An inner tube with one end of the tube serving as a primary flame hole, a nozzle facing the other end of the tube opposite to the primary flame hole, a fixing component for fixing the inner tube and the nozzle, and a fixing part for fixing the inner tube and the nozzle. It has an outer tube that is separated from the hole and forms a secondary flame hole, the outer tube is provided with an auxiliary air hole that supplies limited secondary air, and the inner tube has a nozzle on the side of the tube near the nozzle. A burner device with two primary air holes at different distances from the burner.