JPH0216106Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a gas supply nozzle for a burner.
A gas supply for burners that uses a blower to forcefully mix air beforehand when supplying fuel gas, allowing for good air mixing in a small space with any blower, making the burner more compact and having a shorter flame. Regarding nozzles.

(Prior art) In the case of burners that burn gas as fuel, in order to achieve downsizing and shortening the flame, it is necessary to sufficiently mix fuel gas and air at an appropriate mixing ratio in a mixing chamber or the like. is necessary.

Therefore, conventionally, attempts have been made to subdivide the gas ejection portion in the cross section of the air flow path, and it is believed that the finer the subdivision, the better.

In reality, when a gas supply pipe is branched into multiple supply nozzles, the diameter of each nozzle nozzle is made small, and the total amount of the nozzle nozzle cross-sectional area is calculated by a single supply nozzle supplying the entire amount of gas. The cross-sectional area of the nozzle orifice was the same as that of the nozzle.

(Problems to be solved by the invention) <Problems with conventional technology> The total cross-sectional area of the nozzle ejection hole is determined to be a predetermined value because the gas discharge amount is fixed and the gas pressure is also fixed. be done. Therefore, as the number of supply nozzles increases, the diameter of the nozzle ejection holes must be made smaller.

However, the supplied fuel gas often contains fine solid impurities, and if the diameter of the nozzle orifice is made too small, the solid impurities will get caught in the nozzle orifice and cause clogging. However, there was a problem with the number of nozzles, and there was a limit to the subdivision based on the number of nozzles.

For this reason, the gas ejection section is often insufficiently subdivided, and the mixing capacity of the mixing chamber (mixer section) must be increased accordingly, so the mixer section inevitably becomes larger. Sisters,
This has been a major problem in reducing the size of water heaters that use this type of burner.

<Technical Issues> Therefore, in view of the above-mentioned problems, this invention is a simple structure that uses a blower to forcefully mix air beforehand when supplying fuel gas. This was devised with the aim of achieving good air mixing in even a small space, thereby making it possible to downsize the burner and shorten the flame length.

[Structure of the invention] (Means for solving the problem) This invention is based on a gas supply nozzle of a burner that mixes air in advance when supplying fuel gas, at or near the tip of the nozzle.
Forms a dispersion section that disperses the supplied fuel gas,
This dispersion section solves the above-mentioned problem by having a dispersion plate disposed in the radial direction to guide and disperse the injected fuel gas to be supplied in the radial direction.

(Function) A dispersion section for dispersing the supplied fuel gas is formed at or near the tip of the gas supply nozzle, and this gas supply nozzle is used in a burner that mixes air in advance when supplying the fuel gas. As a result, the fuel gas ejected from the gas supply nozzle is
The fuel gas is dispersed in the radial direction while being guided by the dispersion plate, thereby supplying the fuel gas in a dispersed manner to improve mixing with air.

(Embodiments) Hereinafter, embodiments of this invention will be described with reference to the drawings.

That is, the reference numeral 1 shown in the figure is a gas supply nozzle, and an appropriate number of nozzles are formed branching off from the gas supply pipe 8. In this case, the number of gas supply nozzles 1 is determined within the range that allows the diameter of the nozzle nozzle 3 to be reduced to the extent that solid impurities mixed in the fuel gas do not clog the nozzle nozzle 3. shall be.

In this gas supply nozzle 1, a nozzle ejection hole 3 is opened at the center of the end face of the nozzle tip 2, and a dispersion plate 4 is disposed near the front of the nozzle tip 2 as in the first embodiment. ing.

For example, as shown in FIGS. 1 and 2, this dispersion plate 4 has dispersion pieces 6 extending radially from a central abutment plate 5.
The substantially center thereof is arranged so as to face the nozzle ejection hole 3, and is fixed by a mounting piece 7. When forming the dispersion plate 4, cuts are made in a substantially circular plate to form the abutment plate 5 and the dispersion piece 6, and the other parts are cut and raised, leaving the abutment plate 5 and the dispersion piece 6. This part will be referred to as mounting piece 7. By doing so, the distribution plate 4 can be formed very easily. Further, the dispersion piece 6 is formed so that its cross section is curved to form a gutter-like shape, and the inside of the curve is directed toward the nozzle ejection hole 3 .

When the dispersion plate 4 is formed in this manner, the fuel gas ejected from the nozzle ejection holes 3 hits the abutment plate 5 and flows laterally. Since the dispersion piece 6 is formed at this time, the fuel gas is guided and dispersed according to the gutter-like dispersion piece 6 as shown by the thin black arrow. The air flow is made to flow in the same direction as the fuel gas ejection direction as shown by the white arrow, that is, in the direction of the dispersion plate 4 from where the gas supply nozzle 1 is located. In this case, even if the diameter of the nozzle ejection hole 3 is not made small, the fuel gas will be ejected in branches in the same way as when a large number of subdivided nozzles are arranged, and moreover, it will flow laterally to the air flow. The stirred fuel gas and air are reliably mixed, and a well-mixed gas is supplied.

The dispersion plate 4 formed in this manner is effective when used in an all-primary premixing type domestic water heater B using a blower 18 having a cross-flow fan 10, as shown in FIGS. 3 and 4, for example. It is true. This household water heater B uses a blower 18 (crossflow fan) having a crossflow fan 10 to forcibly suck in and mix fuel gas and air, and sends the fuel gas and air to the flame opening face plate 11 via a dispersion plate 19. This mixed gas is combusted in the mouth plate 11, and hot water is produced and supplied by a heat exchanger 12 made up of water pipes 16 and fins 17. The gas supply nozzle 1 is arranged at the air intake port 14 and the flame outlet face plate 1
A mixed gas of fuel gas and air is sent to the flame outlet face plate 11 from an air outlet 15 arranged below the flame outlet 11. At this time, although the cross-flow fan 10 itself has a blowing force, it does not cause turbulence, so the fuel gas and air are not mixed very much. Therefore, by arranging the gas supply nozzle 1, mixing is performed reliably and a good mixing state can be obtained, so that the gas with sufficient air mixed therein can be completely combusted in the flame outlet face plate 11, resulting in a short flame. can be achieved. In this case, the distance between the heat exchanger 12 and the burner face plate 11 can naturally be shortened, so that the domestic water heater B can be made smaller.

On the other hand, in the case of the second embodiment, the nozzle ejection holes 3 are opened only around the nozzle tip 2 of the gas supply nozzle 1 with approximately equal distribution, and the dispersion plate 4 is arranged in the gas supply pipe rather than the nozzle ejection holes 3. Place them on the 9th side.
This dispersion plate 4 has a shape in which dispersion pieces 6 are attached in a radial direction directly from the nozzle tip 2 to the position of each nozzle ejection hole 3, and the tips of the dispersion pieces 6 are connected in an annular shape. In this case, the air flows through the dispersion pipe 8 toward the nozzle tip 2, and the fuel gas is ejected in a radial direction. As a result, the fuel gas is guided and dispersed along the dispersion piece 6, and as in each of the embodiments described above, a good mixing state of the fuel gas and air is obtained.

Note that the gas supply nozzle 1 is not limited to the structure of each embodiment described above, and the gas supply nozzle 1
Needless to say, any structure may be used as long as the dispersion section is formed at or near the nozzle tip 2.

[Effects of the invention] This invention configured as described above has the advantage that, in the gas supply nozzle 1 of the burner where air is mixed in advance when supplying fuel gas, the fuel to be supplied is placed at or near the tip 2 of the nozzle 1. A dispersion section for dispersing the gas is formed, and this dispersion section has a dispersion plate 4 disposed in the radial direction to guide and disperse the fuel gas injected to be supplied in the radial direction. In order to achieve a good result, the nozzles do not need to be subdivided and arranged in large numbers.
Furthermore, since one gas supply nozzle 1 branches the gas flow into multiple streams, the fuel gas can be guided in the radial direction along the distribution plate 4 without making the diameter of the nozzle ejection hole 3 of the gas supply nozzle 1 very small. Since the fuel gas and air are dispersed, a good mixing state of fuel gas and air can be obtained. As a result, even if solid impurities etc. are mixed into the fuel gas, the nozzle ejection holes 3 will not be clogged with them. Therefore, the conventional problem of not being able to easily subdivide the gas ejection part can be solved, and the mixture of fuel gas and air can be improved.
The mixed gas sent to the burner face plate 11 to be combusted contains sufficient air, which enables complete combustion and a short flame, which in turn leads to the downsizing of the domestic water heater B. be.

Moreover, as the structure of the dispersion section, for example, dispersion pieces 6 extending radially from the central abutting plate 5
A dispersion plate 4 is arranged and fixed near the front of the tip portion 2 of the gas supply nozzle 1 so that the approximate center of the abutment plate 5 faces the nozzle ejection hole 3.
Alternatively, the nozzle ejection holes 3 are formed in a substantially even distribution only around the nozzle tip 2 of the gas supply nozzle 1, and the nozzle ejection holes 3 are emitted directly to the position next to the gas supply pipe 9. By using a dispersion plate 4 with dispersion pieces 6 attached in the direction, the structure is simple, the fuel gas and air can be mixed well, and it can be provided at low cost.

In this way, according to this invention, by just slightly improving the gas supply nozzle and providing the above-mentioned dispersion section, it is possible to achieve good mixing of fuel gas and air.
A domestic water heater can be made shorter in flame length and smaller in size, and the cost is no different from conventional ones, and on the contrary, it can be provided at a lower price, which is a practical advantage.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a perspective view of the first embodiment, FIG. 2 is a sectional view,
Figure 3 is a front cross-sectional view showing the usage state when used in a domestic water heater of the all primary premix type.
FIG. 4 is a side sectional view, and FIG. 5 is an enlarged perspective view of the second embodiment. B... Domestic water heater, 1... Gas supply nozzle, 2... Nozzle tip, 3... Nozzle jet hole,
4...Dispersion plate, 5...Abutting plate, 6...Distribution piece, 7...Mounting piece, 9...Gas supply pipe, 10...
...Crossflow fan, 11... Flame face plate, 12... Heat exchanger, 13... Motor, 14... Air intake port,
15...Blower outlet, 16...Water pipe, 17...Fin, 18...Blower, 19...Dispersion plate.

Claims (1)

[Claims for Utility Model Registration] 1. In a gas supply nozzle of a burner that mixes air in advance when supplying fuel gas, a dispersion portion that disperses the supplied fuel gas is formed at or near the tip of the nozzle. A gas supply nozzle for a burner, characterized in that the dispersion section has a dispersion plate arranged in a radial direction to guide and disperse fuel gas injected to be supplied in the radial direction. 2. The dispersion section has a dispersion piece extending radially from the central abutment plate, and is arranged and fixed near the front of the tip of the gas supply nozzle so that the approximate center of the abutment plate faces the nozzle ejection hole. The first claim for utility model registration consists of the dispersion plate
Gas supply nozzle for the burner described in Section 1. 3. The dispersion section has nozzle ejection holes approximately evenly distributed only around the nozzle tip of the gas supply nozzle,
A gas supply nozzle for a burner according to claim 1, which is comprised of a dispersion plate having a dispersion piece attached in a radial direction directly to the side of the gas supply pipe of the nozzle ejection hole.