JP2981651B2 - Cylindrical gas burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical gas burner used for a barbecue stove and the like, and more particularly to a cylindrical gas burner of a type in which vaporized gas in a liquefied gas cartridge is directly supplied to the gas burner without using a pressure regulator. About.

[0002]

2. Description of the Related Art Gas burners used in gas barbecue stoves, gas roasters, and the like have a long cylindrical shape, and flame openings are formed in a row on the peripheral surface along the axis of the burner. In the burner, in order to obtain a uniform flame over the entire length, a mesh body is stretched along the inner surface of the burner to equalize the gas pressure in the burner.

[0003]

However, in a gas combustion apparatus in which a liquefied gas cartridge is directly connected to a gas burner without a pressure regulator, the pressure in the liquefied gas cartridge directly affects combustion in the burner. And
Normally, the liquefied gas cartridge is at an equilibrium pressure at the start of use, so the pressure is sufficiently high, but after several minutes of use, the temperature inside the gas cartridge decreases due to the vaporization of the liquefied gas. The equilibrium pressure drops.
For this reason, if the opening cross-sectional area of the burner flame outlet is set according to the pressure at the start of use, the gas pressure will decrease during use, and sufficient thermal power cannot be obtained, and the opening cross-sectional area of the burner flame outlet will be used. If the pressure is set in accordance with the pressure at the time, the ejection pressure is too high at the start of use, and a drift phenomenon occurs in which the flame separates from the flame opening. If the pressure at which the gas is injected from the gas injection nozzle into the burner is too high, the amount of primary air to be sucked in does not balance with the gas amount due to the flow velocity at the time of gas injection, and there is a problem that the generation of carbon monoxide increases.

The present invention has been proposed in view of the above, and an object of the present invention is to provide a cylindrical burner capable of maintaining a stable combustion state for a long time.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a distal end portion of a linear cylindrical body whose base end portion is externally fixed to a gas ejection nozzle of a valve block. The flame ports are arranged in a row along the axis of the cylinder on the peripheral wall surface of the cylindrical body, and a mesh screen is provided on the proximal end of the cylindrical body in a state perpendicular to the gas flow direction. The primary air inlet is formed on the peripheral wall of the cylindrical body located closer to the valve block than the mesh screen, and the shaft is located on the distal end side of the mesh screen disposing portion and on the proximal end side of the flame port forming portion. The core is arranged with a columnar body orthogonal to the gas flow, and a mounting portion of a gas cartridge for storing liquefied gas is formed in the valve block. In the invention disclosed in claim 2, in addition to the above configuration, A flame opening that opens in a row on the peripheral surface of the cylinder Caliber, formed such changes stepwise in the longitudinal direction of the cylindrical body, it is characterized in that as the flame port located on the tip side of the bore was formed to be larger.

[0006]

According to the invention disclosed in the first aspect, a mesh screen is arranged at a base end side portion of the cylindrical body in a state orthogonal to the gas flow direction, and an inlet for primary air is opened on the valve block side of the mesh screen. At the same time, since a cylindrical body whose axis is orthogonal to the gas flow is arranged between the mesh screen and the flame port forming part, the primary air is taken in by the gas flow ejected from the gas ejection nozzle at high speed, and the mesh screen is Because of the resistance to the gas-air flow, the gas flow rate is suppressed and the gas-air is mixed. In addition, since the cylindrical body is arranged on the downstream side of the mesh screen in a direction orthogonal to the gas flow, a vortex is formed on the downstream side of the cylindrical body, so that the gas can be slowed down and drift can be suppressed. Become.

Further, in the invention disclosed in claim 2, in addition to the above-described structure, the opening diameter of the opening formed in the peripheral surface of the cylindrical body is formed so as to change stepwise in the longitudinal direction of the cylindrical body. And
Since the diameter of the flame port located closer to the distal end is increased, the gas can reliably reach the distal end of the burner, and can be burned in a more uniform state.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded perspective view of a gas barbecue grill shown as an example of an apparatus using a cylindrical gas burner of the present invention, FIG. 2 is a sectional view of a main part of the cylindrical gas burner taken out, and FIG. FIG. 4 is an enlarged view of a part III of FIG.
It is a line sectional view. This barbecue grill has a metal saucer-shaped main body (1) formed with its upper surface open, a cylindrical gas burner (2) disposed in the main body (1), and a main body (1).
And a wire mesh (4) placed in the opening of the main body (1). The outer peripheral surface of the main body (1) The support leg (5) is pivotally supported in a foldable manner.

The cylindrical gas burner (2) is composed of a pair of upper and lower strips, each having a recessed arc-shaped groove formed in the center in the width direction, with the groove openings facing each other. Each of the portions (6) is caulked and formed by spot welding at appropriate intervals in the longitudinal direction, and the bulging portion peripheral wall corresponding to the groove forming portion of the band plate on the upper side thereof is formed. A flame port (7) is formed in a line in the longitudinal direction of the groove at a transition portion to the flange (6).

The base end of the cylindrical gas burner (2) is externally fitted and fixed to a gas ejection nozzle (9) projecting from the valve block (8), and the front end is sealed. A mesh screen (12) supported by a metal ring (10) for fixing is arranged at the base end of the cylindrical burner (2) in a state perpendicular to the gas ejection direction of the gas ejection nozzle (9). There is a valve block than the place where this mesh screen (12) is installed
(8) Primary air intake for combustion in the cylinder wall at the part located on the side
(11) is open. And mesh screen (12)
Is fixed to the distal end surface of the metal ring (10), and the metal ring (10) is oriented in the axial direction of the mesh screen (12) so that the mesh screen (12) can be easily installed in a regular posture in the cylindrical burner (2). Have an appropriate length.

The mesh screen (12) and the flame outlet
(7) A metal cylindrical body (13) is arranged between the metal column and the forming part so that the axis of the metal cylindrical body is orthogonal to the flow direction of the remaining gas. The metal cylinder (13) passes through the mesh screen (12) and collides with a gas-primary combustion air mixture, the flow velocity of which has been reduced, so that a vortex flows downstream of the cylinder (13). Is formed to disperse the gas flow, thereby suppressing the occurrence of the drift action at the flame outlet (7).

The diameter of the flame port (7) is changed stepwise every one-third of the total length of the burner.
Is a small diameter, 1/3 in the center is an intermediate diameter, and 1 /
3 is formed with a large diameter, respectively, and the flame port on the base end side
The gas flow resistance of (7) is increased so that a uniform flame can be obtained over the entire length of the cylindrical burner (2).

The valve block (8) has an adjusting knob (14) for the valve protruding in a direction opposite to the mounting surface of the gas cartridge (15), and has a flow control valve built therein. The valve block (8) is fixed to one end of the cylindrical gas burner (2) so that the mounting surface of the gas cartridge (15) is inclined with respect to the vertical axis. Therefore, the gas cartridge (15) is set in an inclined posture, so that the height as a stove can be suppressed and the area of the liquid surface serving as a gas-liquid contact surface in the gas cartridge (15) is increased. Thus, the vaporization efficiency can be increased.

In the cylindrical burner (2) having the above structure,
Vaporized gas derived from the gas cartridge (15) is supplied from the gas ejection nozzle (9) of the valve block (8) to the cylindrical burner (2).
By injecting air into the screen mesh (1),
In step 2), the gas flow rate is reduced and the gas and air are mixed. Furthermore, the air-fuel mixture that has passed through the mesh screen (12) scatters by colliding with the metal cylinder (13) located on the downstream side of the mesh screen (12), and disperses. A vortex will be generated downstream.

At this time, since the cylindrical burner (2) is directly connected to the gas cartridge (15), the gas cartridge (1) is
5) The higher the pressure inside, the higher the gas flow velocity of the gas ejected into the cylindrical burner (2), so that the flow resistance in the mesh screen (12) and the flow rate in the metal cylinder (13) When the resistance increases and the pressure in the gas cartridge (15) decreases, the gas flow velocity of the gas ejected into the cylindrical burner (2) decreases. The resistance at the cylindrical body (13) is reduced. As a result, the pressure of the gas flowing through the cylindrical burner (2) is
It can be set within a certain range irrespective of the internal pressure state of (15).

Further, since the diameter of the flame port (7) of the cylindrical burner (2) is changed every 1/3 of the entire length, a gas supply section (gas supply section) having a small pressure loss while flowing through the burner is provided. The opening cross-sectional area is small at the base end side where the distance from the jet nozzle is small and the pressure cross-sectional area where the pressure loss increases is large at locations far from the gas supply unit (gas jet nozzle), causing drift. Thus, a uniform flame can be formed over the entire length of the cylindrical burner.

[0017]

According to the first aspect of the present invention, a mesh screen is arranged on the base end portion of the cylindrical body in a state perpendicular to the gas flow direction, and between the mesh screen and the flame port forming portion. Since the axis is arranged in a cylinder perpendicular to the gas flow, the mesh screen becomes resistant to the gas flow, so the gas flow rate is suppressed and the gas flow is performed downstream of the mesh screen. Since it is arranged in a direction perpendicular to the cylinder, a vortex is formed on the downstream side of this cylindrical body to make the gas slower, drift can be suppressed, and while the burner is directly connected to the gas cartridge, A stable combustion state can be maintained without being affected by pressure fluctuations in the cartridge.

[0018] As described in claim 2, in addition to the above configuration, the opening diameter of the flame ports formed in a row on the peripheral surface of the cylindrical body is formed so as to change stepwise in the longitudinal direction, In the case where the diameter of the flame port is increased so that it is closer to the tip side, the gas can surely reach the tip part of the burner, and it can be burned in a more uniform state at each flame port. Become.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a gas barbecue grill shown as an example of a device using a cylindrical gas burner of the present invention.

FIG. 2 is a sectional view of a main part of a cylindrical gas burner taken out.

FIG. 3 is an enlarged view of a part III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

[Explanation of symbols]

7: Flame port, 8: Valve block, 9: Gas ejection nozzle,
11… Primary air intake, 12… Mesh screen, 13… Cylinder, 15… Gas cartridge.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-50531 (JP, A) JP-A-50-130726 (JP, U) JP-A-56-56505 (JP, U) JP-A 50-130 141831 (JP, U) JP-A 61-53624 (JP, U) JP 27-1883 (JP, Y1) JP-A 47-5892 (JP, Y1) (58) Fields investigated (Int. ⁶ , DB name) F23D 14/10 F23D 14/28 F24C 3/08 F24C 3/14

Claims (2)

(57) [Claims] 1. A front end portion of a linear cylinder whose base end is fixedly fitted to a gas ejection nozzle (9) of a valve block (8) is sealed, and a flame port (7) is formed on a peripheral wall surface of the cylinder. ) Are arranged in a row along the axis of the cylinder, and a screen mesh (12) is arranged at a base end portion of the cylinder so as to face the gas ejection nozzle (9) in a state orthogonal to the gas flow direction. A primary air inlet (11) is formed on the peripheral wall of the cylinder located closer to the valve block (8) than the portion where the mesh (12) is provided, and a flame outlet (7) is provided on the distal end side of the screen mesh (12). A cylindrical body (13) whose axis is orthogonal to the gas flow is disposed on the base end side of the portion where the gas cartridge is formed, and a mounting portion for a gas cartridge (15) for storing liquefied gas is formed in the valve block (8). Cylindrical gas burner. 2. A flame port (7), which is opened in a row on the peripheral surface of a cylindrical body, is formed such that the diameter of each of the apertures changes stepwise in the longitudinal direction of the cylindrical body, and the flame port ( 7. The cylindrical gas burner according to claim 1, wherein the diameter is increased as the diameter of the gas burner increases.