JP2001235152A - Pilot burner type ignition device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pilot burner type ignition device for reducing the increase/decrease of the length of the flame of a pilot burner to the change of a gas pressure and for increasing the degree of freedom of design including the shape of the combustion surface of a main burner. SOLUTION: In a pilot burner type ignition device 1 for firing a main burner 5 by flame 4 of a pilot burner 3, a flame-stabilizing member 2 for retaining flame 4 by showing a pail shape or a cylindrical shape, and allowing the flame 4 to enter from one end and to exit from the other is attached. The flame 4 enters the flame-stabilizing member 2 while being inclined to the axis of the flame-retaining tool 2. Therefore, when the flame 4 is large, the flame- stabilizing member 2 becomes friction resistance and suppresses the extension of the flame 4. On the other hand, when the flame 4 is small, the flame- stabilizing member 2 prevents upward curving (lifting) and accelerates the extension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot burner type ignition device such as a gas appliance for igniting a main burner by a pilot burner.

[0002]

2. Description of the Related Art In an ignition device of a type in which a main burner 5 is ignited by a flame 4 of a pilot burner 3, as shown in FIG. 4 or FIG.
It greatly fluctuates like B and 4C. Therefore, regardless of whether the flame 4 is short or long, the flames 4A, 4B, and 4C can approach the flame holes (the combustion surface 52 in the case of the combustion plate type burner) of the main burner 5, and the main burner 5 can be ignited reliably. You need to do that. As a result, the design of the combustion surface 52 of the main burner 5 or the pilot burner 3 is restricted, for example, the size of the ignition surface 50 of the main burner 5 in the vicinity of the flame 4 of the pilot burner 3 is increased in the direction of the flame 4. . In addition, since the length of the flame 4 of the pilot burner 3 varies depending on a gas type (fuel) such as natural gas, propane gas, and coal gas, the same problem as described above occurs.

[0003]

In the conventional pilot burner type ignition device, the design of the main burner is limited due to the restriction for ensuring that the fire is transferred to the main burner, and the temperature distribution in the heating range is increased. This is an obstacle to the optimization of gas and compactness of gas appliances. An object of the present invention is to reduce the increase and decrease in the length of the flame of the pilot burner with respect to changes in gas pressure and gas type, and to increase the degree of freedom in design such as the shape of the combustion surface of the main burner. An object of the present invention is to provide a pilot burner type ignition device capable of optimizing a temperature distribution in a heating range.

[0004]

According to the present invention, there is provided an ignition device for a gas appliance in which a main burner is ignited by a flame of a pilot burner, wherein at least two directions around an intermediate portion of the flame are shielded to hold the flame. A flame holder is provided. The flame holder is more practical if it is formed as a gutter or tube that holds the middle part of the flame by the flame entering from one end and blowing out from the other end.

[0005]

According to the present invention, when the flame of the pilot burner is large due to the high gas pressure, the flame holder becomes the resistance to the passage of the flame to suppress the elongation, and when the flame is small due to the low gas pressure, the flame holding is suppressed. The fixture retains the flame and prevents it from curving upwards to promote elongation. For this reason, the change in the flame length of the pilot burner with respect to the change in the gas pressure can be reduced. As a result, it is easy to increase the degree of freedom in designing the main burner and to optimize the temperature distribution.

According to the third aspect of the present invention, the flame of the pilot burner enters the flame holder at an angle to the axis of the flame holder. For this reason, when the flame is large, the flame holding device has a large effect of suppressing the elongation due to the resistance of the flame. Further, since the pilot burner itself can be mounted diagonally, the contact resistance between the flame of the pilot burner and the flame holder can be increased, and the mounting space for the pilot burner can be made compact.

According to a fourth aspect of the present invention, the main burner is a grill burner having a downwardly facing combustion surface, and the flame holder has a gutter shape with an open top, and is disposed at a flame opening penetrating through a side wall of the grill storage. Have been. This makes it possible to configure a gas appliance with a grill that has a proper temperature distribution in the grill storage and can smoothly ignite the main burner.

[0008]

1 to 3 show a pilot burner type ignition device 1 according to the present invention. A flame attached to a side wall 12 of a grill storage 11 of a grill for grilling installed on a gas stove. It comprises a holder 2 and a pilot burner 3 arranged outside the side wall 12. The grill storage 11 has an outlet 13 for food to be cooked on the front and an exhaust port 1 on the back.
4 are provided. The side wall 12 has a flame port 15 through which the flame 4 of the pilot burner 3 is inserted.
The flame port 15 may be a polygon, an ellipse, an oval, or the like other than the round hole as long as the flame 41 has a size that allows the base 41 of the flame 4 to be easily inserted.

The ceiling of the grill storage 11 is formed by a casing 51 of the main burner 5 of the combustion plate type. The main burner 5 has a combustion surface 52 directed downward at a central portion of the casing 51. The combustion surface 52 is formed in a substantially U-shape with the exhaust port 14 side set somewhat higher and directed downward. The flame holder 2 is formed of a substantially U-shaped gutter 21 which is arranged concentrically with the flame outlet 15 and is horizontally arranged, and surrounds and shields the lower part and the left and right sides of the intermediate part 42 of the flame 4. I have.

The flame 4 has a large flame 4A when the gas pressure supplied to the pilot burner 3 is high, a small flame 4C when the gas pressure is low, and a medium flame 4B when the gas pressure is medium.
The size, including the length, increases or decreases. The flame holder 2 is a flame 4
In the intermediate portion 42, the flame 4 is prevented from bending upward (lifting) due to an upward airflow from below or from the left and right sides, and the horizontal length of the flame 4 is maintained.

Since the large flame 4A has a large cross-sectional area (thickness of the flame), the intermediate portion 42 adheres to the inner wall surface of the gutter 21 and receives a large frictional resistance from the gutter 21 when the flame passes. For this reason, the length is reduced if the extension in the horizontal direction is hindered. Since the small flame 4C has a small cross-sectional area (thickness of the flame), it hardly receives frictional resistance from the gutter 21 when the flame passes, and secondary air supplied from the surroundings (from below and left and right sides). Is restricted and the upward bending is suppressed, so that the horizontal extension is promoted and the length is increased.

The flame holder 2 may be arranged such that the front end side (the inside of the grill 11) is inclined obliquely upward. The flame holder 2 is a substantially V-shaped gutter, a circular, elliptical, elliptical or polygonal tube. There may be. The flame holder 2 needs to have a wall that blocks the supply of the secondary air from at least two directions around the intermediate portion 42 of the flame 4, and shields three directions like a gutter or four directions like a cylinder. It is desirable to do.

This is because, in the case of shielding in only one direction around the intermediate portion 42 of the flame 4, a large area is required for the shielding wall, so that the mountability is reduced and the tip 43 of the flame 4 is curved upward. This is due to the insufficient effect of suppressing the occurrence of the above. In addition, the gutter 21 has an advantage that the tip portion 43 of the flame 4 can be prevented from bending upward in the flame holder 2 and directly burning the tip of the flame holder 2 as compared with the cylinder.

In this embodiment, the U-shaped gutter 21 is
Abutting plates 22 and 23 to the inner wall of the side wall 12 extending perpendicularly to both sides from the end of the first member 1; and hooking portions 24 and 25 formed by bending the upper ends of these abutting plates 22 and 23 into a hook shape. And the hooks 24 and 25 are hung on the upper edge 16 of the side wall 12. The U-shaped gutter 21 may be provided to the inner wall of the side wall 12 by other methods such as welding, brazing, screwing, fitting to the flame port 15, or the like.

In the pilot burner 3, the nozzle 31 is horizontally mounted at an angle of deflection angle α = about 30 degrees with the axis of the flame port 15 and the gutter 21. A spark discharge electrode 33 for ignition is attached to the tip of the nozzle 31.
The length of the flame 4 increases and decreases due to the fluctuation of the gas pressure of the fuel gas. When the gas pressure is high and the flame 4 is large, the flame 4
Is in contact with the right side wall 2A, the left side wall 2B or the bottom wall 2C of the gutter 21 in a large area, is decelerated by friction, and its length is shortened.

When the flame 4 is a small flame 4C having a low gas pressure and a small flame 4C, the flame 4 does not come into contact with the right side wall 2A, the left side wall 2B or the bottom wall 2C, or even if it does, the contact area is small. The flame 4 is extended by the secondary air which is guided into the flame 4 and is sucked into the gutter 21. Also, bottom wall 2C
As a result, the upward airflow from below is blocked. For this reason, the lifting force of the small flame 4C is suppressed, and the upward bending of the distal end portion 43 is prevented, so that the horizontal length is increased.

The increase / decrease in the length of the flame 4 with respect to the change in the gas pressure is reduced. For this reason, even if the ignition surface 53 for igniting the combustion surface 52 of the main burner 5 is small, the ignition can be reliably performed. As a result, the degree of freedom in designing the combustion surface 52 is increased, and it becomes easy to make the temperature distribution in the grill storage 11 uniform. In addition, the length of the flame 4 of the pilot burner 3 depends on the gas type (fuel) such as natural gas, propane gas, and coal gas. Increases or decreases. Also in this case, the flame holder 2 of the present invention has the effect of reducing the increase or decrease of the length of the flame 4.

The axis of the nozzle 31 or the flame 4 is
5 and the axis of the gutter 21 may be the same, but if the pilot burner 3 is set at an inclination of a deflection angle α = about 30 degrees as in this embodiment, when the flame 4 passes through the gutter 21, Since the passage resistance due to friction applied to the flame 4 increases, the effect of suppressing the elongation of the flame 4 is great. The inclination angle is appropriately set depending on the length of the gutter, but is 30 degrees ± 15 degrees.
Good degree range.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pilot burner type ignition device of the present invention.

FIG. 2 is a front view of a grill having the pilot burner type ignition device of the present invention.

FIG. 3 is a plan view of a grill having the pilot burner type ignition device of the present invention.

FIG. 4 is a front view of a grill having a conventional pilot burner type ignition device.

FIG. 5 is a plan view of a grill having a conventional pilot burner type ignition device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pilot burner type ignition device 2 Flame holder 3 Pilot burner 4 Flame 5 Main burner 11 Grill storage 12 Side wall 15 Flame port 21 Gutter 42 Intermediate part 52 Burning surface 53 Ignition surface

Claims (4)

[Claims] 1. An ignition device for a gas appliance which ignites a main burner by a flame of a pilot burner, wherein a flame holder for holding the flame by shielding at least two directions around an intermediate portion of the flame is provided. A pilot burner type ignition device characterized by the following. 2. The pilot burner type ignition device according to claim 1, wherein the flame holding member is a gutter or a tube that receives the flame from one end and blows out from the other end to hold an intermediate portion of the flame. A pilot burner type ignition device characterized by the following. 3. The pilot burner type ignition device according to claim 1, wherein the flame enters the flame holder with an inclination with respect to an axis of the flame holder. apparatus. 4. The pilot burner type ignition device according to claim 1, wherein the main burner is a grill burner having a downwardly facing combustion surface, and the flame holder has a gutter shape with an open top. And a pilot burner type ignition device, which is arranged at a flame outlet penetrating a side wall of the grill storage.