JP6787753B2 - Gas nozzle for stove burner - Google Patents

Description

The present invention relates to a gas nozzle for a stove burner that injects fuel gas toward the inflow port of a mixing pipe of the stove burner.

Originally, this type of gas nozzle is configured to inject fuel gas from the nozzle hole by supplying the fuel gas to the gas flow path in the nozzle body having the nozzle hole formed at the tip. When the fuel gas is injected from the nozzle hole, the primary air is sucked into the fuel gas by the ejector effect, a mixture of the fuel gas and the primary air is generated in the mixing pipe, and this mixture is ejected from the flame hole of the control burner. It burns. However, when the heating power of the stove is adjusted to a small heating power state and the ejection speed of the fuel gas is reduced, the suction ratio of the primary air is reduced and misfire is likely to occur.

Therefore, conventionally, according to Patent Document 1, there is known a gas nozzle for a stove in which an obstacle that causes turbulence in the flow of fuel gas toward the nozzle hole is arranged in a gas flow path in the nozzle body. In this gas nozzle, the gas flow entering the nozzle hole becomes turbulent, and even if the gas ejection speed decreases due to small heat, the ejected gas flow does not become a laminar flow state, and the primary air is sufficiently sucked to retain flame. Is enhanced.

In the one described in Patent Document 1, the obstacle is a bottomed tubular shape having a bottom portion orthogonal to the central axis of the nozzle hole and a tubular portion in contact with the peripheral surface of the gas flow path, and the nozzle is provided at the bottom portion. A plurality of openings through which fuel gas passes are formed so as to be located at a portion away from the central axis of the hole. The minimum dimension from the center of the bottom of the obstacle that matches the central axis of the nozzle hole to the opening is smaller than the radius of the nozzle hole.

By the way, recently, a gas stove that automatically cooks by detecting the temperature of the bottom surface (pot bottom) of a cooking container by a pot bottom temperature sensor attached to a stove burner has become widespread. In such a gas stove, switching between the large thermal power and the small thermal power of the stove burner is automatically and frequently performed, but even if the conventional gas nozzle described in Patent Document 1 is used, the thermal power from the small thermal power to the large thermal power is used. The following problems occur when switching. That is, when the thermal power is switched from small thermal power to large thermal power, the increase in the amount of primary air sucked is delayed due to the rapid increase in the amount of gas, and the air-fuel mixture becomes gas-rich, causing soot to adhere to the bottom of the pot.

JP-A-11-21128

In view of the above points, the present invention is for a stove burner that ensures flame retention at a small thermal power and also prevents the air-fuel mixture from becoming gas-rich when switching from a small thermal power to a large thermal power. The challenge is to provide a gas nozzle.

In order to solve the above problems, the present invention is a gas nozzle for a controller that injects fuel gas toward the inlet of the mixing tube of the controller, and the gas flow in the nozzle body having a nozzle hole formed at the tip thereof. An obstacle is placed on the path that causes turbulence in the flow of fuel gas toward the nozzle hole, and this obstacle has a bottom portion orthogonal to the central axis of the nozzle hole and a cylinder portion in contact with the peripheral surface of the gas flow path. An obstacle that has a bottomed tubular shape and has a plurality of openings through which fuel gas passes, which are located at a portion away from the central axis of the nozzle hole at the bottom and match the central axis of the nozzle hole. The minimum distance from the center of the bottom to the opening is larger than the radius of the nozzle hole, and the total area of the opening seen from the axial direction of the nozzle hole is 7 times or more the cross-sectional area of the nozzle hole, and obstacles are placed. It was characterized der Rukoto 70% or less of the cross-sectional area of the portion of the gas channel.

According to the present invention, as in the above conventional example, the gas flow entering the nozzle hole is in a turbulent state, and even if the gas ejection speed is reduced by a small amount of heat, the ejected gas flow does not become a laminar flow state, and the primary air Is sufficiently sucked and the flame retention property is enhanced. Further, according to the present invention, the portion of the bottom of the obstacle in which the opening is not formed is used as the barrier portion, and the barrier portion has a spread larger than the projected area of the nozzle hole. Therefore, the gas flow passing through the projected area portion of the nozzle hole is always affected by the barrier portion and detours toward the nozzle hole without going straight. As a result, even if the amount of gas suddenly increases due to the switching from small thermal power to large thermal power, the increase in the amount of gas ejected from the nozzle hole is effectively mitigated, and the increase in the amount of primary air sucked increases the amount of gas. It is possible to prevent the air-fuel mixture from becoming gas-rich without delay.

By the way, when the total area of the openings seen from the axial direction of the nozzle hole is less than 7 times the cross-sectional area of the nozzle hole, the passing resistance in the gas nozzle becomes large, and a sufficient amount of ejected gas is produced in a large thermal power state. You will not be able to obtain it. Further, when the total area of the openings seen from the axial direction of the nozzle hole exceeds 70% of the cross-sectional area of the gas flow path where the obstacle is arranged, the ejected gas flow sucks the primary air in a small thermal power state. It does not become turbulent enough to do so, and it is easy to misfire. Therefore, the total area of the openings seen from the axial direction of the nozzle holes is 7 times or more the cross-sectional area of the nozzle holes as described above, and 70% or less of the cross-sectional area of the gas flow path where obstacles are arranged. It is desirable to have.

Further, in the present invention, it is desirable to form the outer peripheral surface of the nozzle body near the tip end as a tapered surface. According to this, the primary air is smoothly sucked into the jet gas flow from the nozzle hole along the tapered surface from the radial outer space of the nozzle body, and it is possible to smoothly suck the primary air into the jet gas flow from the nozzle hole at both the thermal power switching and the steady state. , The amount of primary air sucked increases. Therefore, it is possible to more effectively prevent the air-fuel mixture from becoming gas-rich and causing soot adhesion to the bottom of the pot.

The cut side view of the gas nozzle of embodiment of this invention. An enlarged cross-sectional view taken along the line II-II of FIG. The perspective view of the obstacle provided in the gas nozzle of an embodiment.

With reference to FIG. 1, reference numeral A denotes a mixing pipe of the stove burner, and fuel gas is injected from the gas nozzle 1 for the stove burner of the embodiment of the present invention toward the inflow port A1 of the mixing pipe A. The gas nozzle 1 includes a nozzle body 2 attached to a gas supply member (not shown). A gas flow path 3 through which fuel gas supplied from a gas supply member flows is provided in the nozzle body 2, and a nozzle hole 4 located coaxially with the gas flow path 3 is provided at the tip of the nozzle body 2. It is formed.

The gas flow path 3 has a columnar portion 31 near the tail end of the nozzle body 2 and a conical portion 32 whose diameter gradually decreases from the columnar portion 31 toward the nozzle hole 4. An obstacle 5 that causes turbulence in the flow of fuel gas toward the nozzle hole 4 is arranged in the columnar portion 31 of the gas flow path 3.

With reference to FIGS. 2 and 3, the obstacle 5 has a bottom portion 51 orthogonal to the central axis 4a of the nozzle hole 4 and a tubular portion 52 in contact with the peripheral surface of the columnar portion 31 of the gas flow path 3. It is formed in the shape of a bottom cylinder. The tubular portion 52 is provided with a taper that expands in diameter toward the tail end side opposite to the bottom portion 51, and the outer diameter of the portion of the tubular portion 52 near the bottom portion 51 is slightly smaller than the diameter of the cylindrical portion 31. The outer diameter of the tail end side portion of the tubular portion 52 is slightly larger than the diameter of the cylindrical portion 31. Then, a plurality of notches 53 are formed in the tail end side portion of the tubular portion 52 with a circumferential interval, and the peripheral surface of the columnar portion 31 is in a state where the tail end side portion of the tubular portion 52 is reduced in diameter. The obstacle 5 is prevented from moving by being pressed against.

The bottom 51 of the obstacle 5 has a plurality of openings 54 through which fuel gas passes, which are located at a portion away from the central axis 4a of the nozzle hole 4, for example, two openings 54 in a point-symmetrical positional relationship with respect to the central axis 4a. It is formed. Although the opening 54 is formed over the tubular portion 52, the formation range of the opening 54 may be limited to the bottom portion 51.

If the obstacle 5 is arranged in the gas flow path 3 in the nozzle body 2 as described above, the gas flow entering the nozzle hole 4 becomes a turbulent flow state, and even if the gas ejection speed is reduced by a small amount of heat, the ejected gas flow is generated. The laminar flow state does not occur, the primary air is sufficiently sucked, and the flame retention property is enhanced.

Further, in the present embodiment, the minimum distance L from the center of the bottom 51 corresponding to the central axis 4a of the nozzle hole 4 to the opening 54 is made larger than the radius of the nozzle hole 4. Therefore, the portion of the bottom portion 51 in which the opening 54 is not formed is used as the barrier portion, and the barrier portion has a spread equal to or larger than the projected area of the nozzle hole 4.

According to this, the gas flow passing through the projected area portion of the nozzle hole 4 is always affected by the barrier portion and detours toward the nozzle hole 4 without going straight. As a result, even if the amount of gas suddenly increases due to the switching from small thermal power to large thermal power, the increase in the amount of gas ejected from the nozzle hole 4 is effectively mitigated, and the increase in the amount of primary air sucked is the amount of gas. There is no delay in the increase, and it is possible to prevent the air-fuel mixture from becoming gas-rich.

By the way, when the total area of the openings 54 seen from the axial direction of the nozzle hole 4 is less than 7 times the cross-sectional area of the nozzle hole 4, the passing resistance in the gas nozzle 1 becomes large, and a large thermal power state is sufficient. The amount of ejected gas cannot be obtained. Further, when the total area of the opening 54 seen from the axial direction of the nozzle hole 4 exceeds 70% of the cross-sectional area of the columnar portion 31 which is the portion of the gas flow path 3 in which the obstacle 5 is arranged, the small thermal power is generated. In this state, the ejected gas flow does not become a turbulent state sufficient to suck the primary air, and misfire is likely to occur. Therefore, it is desirable that the total area of the openings 54 seen from the axial direction of the nozzle hole 4 is 7 times or more the cross-sectional area of the nozzle hole 4 and 70% or less of the cross-sectional area of the columnar portion 31. In the present embodiment, the total area of the openings 54 seen from the axial direction of the nozzle hole 4 is 7 times the cross-sectional area of the nozzle hole 4 and 38% of the cross-sectional area of the columnar portion 31.

Further, in the present embodiment, the outer peripheral surface of the nozzle body 2 near the tip end is formed on the tapered surface 21. According to this, the primary air is smoothly sucked into the jet gas flow from the nozzle hole 4 along the tapered surface 21 from the radial outer space of the nozzle body 2, and is used during thermal power switching or steady operation. In either case, the amount of primary air sucked increases. Therefore, it is possible to more effectively prevent the air-fuel mixture from becoming gas-rich and causing soot adhesion to the bottom of the pot.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention.

A ... Mixing pipe, A1 ... Inflow port, 1 ... Gas nozzle, 2 ... Nozzle body, 21 ... Tapered surface, 3 ... Gas flow path, 4 ... Nozzle hole, 4a ... Central axis of nozzle hole, 5 ... Obstacle, 51 ... Bottom, 52 ... Cylinder, 54 ... Opening.

Claims (2)

A gas nozzle for a controller that injects fuel gas toward the inlet of the mixing pipe of the controller, and in the gas flow path inside the nozzle body with a nozzle hole formed at the tip, for the flow of fuel gas toward the nozzle hole. An obstacle that causes turbulence is arranged, and this obstacle is a bottomed tubular shape having a bottom portion orthogonal to the central axis of the nozzle hole and a tubular portion in contact with the peripheral surface of the gas flow path, and the nozzle is provided at the bottom portion. In the case where a plurality of openings through which fuel gas passes are formed so as to be located away from the central axis of the hole.
The minimum distance from the bottom center of the obstacle that matches the central axis of the nozzle hole to the opening is larger than the radius of the nozzle hole, and the total area of the opening seen from the axial direction of the nozzle hole is the cross-sectional area of the nozzle hole. 7 times or more, the gas nozzle stove burners, characterized in der Rukoto 70% or less of the cross-sectional area of the portion of the gas channel an obstacle is located. Claim 1 Symbol placement of the gas nozzle, characterized in that the outer peripheral surface of the distal end portion toward the nozzle body is formed on the tapered surface of the tapered.

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