JP6653529B2 - Gas burner - Google Patents

Description

  The present invention relates to a gas burner having a plurality of flame openings.

  A conventional gas burner includes a burner body and a burner head mounted on the burner body. A number of gas supply grooves are radially formed on the lower surface of the burner head. The gas supplied from the burner main body flows through the gas supply groove, and blows out from a large number of flame openings provided on the outer peripheral portion of the burner head to form a flame. The burner body is provided with a thermocouple for detecting an ignition state. For example, there is a gas burner in which a pair of adjacent flame outlets among a large number of flame holes is a detection flame hole, and a thermocouple is provided at a position facing the pair of detection flame holes on the outer peripheral side of the burner head. In this type of gas burner, the ignition state of the gas burner is detected by the thermocouple being heated by two flames formed in a pair of detection flame openings.

  However, this type of gas burner has a problem that it is easy to lift because it is cooled by the flame hitting the thermocouple immediately after ignition or the like. Therefore, in order to prevent the lift of the flame, for example, a portion between the pair of detection grooves (detection flame ports) in the burner cap (burner head) is recessed into the center side of the burner cap and the pair of detection grooves is formed. There has been proposed a gas burner in which a communication recess is formed to allow communication, and a communication recess is disposed to face an ignition detection temperature sensor provided on an outer peripheral side of a burner cap (for example, see Patent Document 1). ).

JP 2015-4456 A

  However, in the gas burner described in Patent Literature 1, the flames formed in the pair of detection grooves may be coupled to each other by being close to each other. In that case, the combustion space is insufficient, so that the flame length increases upward in search of the secondary air. As a result, the distance between the bottom of the pot and the tip of the flame is locally reduced, so that poor combustion or soot may occur.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a gas burner which can improve the flame holding properties of a flame formed in a pair of flame ports for a thermocouple and can prevent poor combustion due to flame coupling.

The gas burner according to the first aspect of the present invention is a gas burner including a burner main body that supplies gas, and a burner head mounted on the burner main body, and is provided in a circumferential direction at an outer peripheral portion of the burner head. A plurality of flame openings in which gas supplied from the burner body is burned to form a flame, and a pair of outer peripheral portions that sandwich a portion facing a thermocouple for ignition detection from both sides in the circumferential direction. A recess formed in the center of the burner head and provided above the outer surface of the recess, and the burner head is provided from the outer surface of the recess. and a protrusion protruding radially outward, the height of the outer surface disposed toward the radially outer side of the convex portion, out of the outer peripheral portion of the burner head, the said pair of said flame hole In the circumferential direction And wherein the at least a portion sandwiched from the side.

  A gas burner according to a second aspect of the present invention is characterized in that, in addition to the configuration of the first aspect, the gas burner further includes a protruding portion provided horizontally above the concave portion and protruding outward in the radial direction. .

  In the gas burner according to the first aspect of the present invention, by providing the concave portion at a position facing the thermocouple, the two flames formed on the pair of flame ports located on both sides of the concave portion are combined. Furthermore, only the upper part of the combined flame can be separated by the convex part provided on the upper part of the outer surface of the concave part. Thereby, the flame holding property of the flame detected by the thermocouple is improved, and the poor combustion due to the flame coupling can be prevented.

  In the gas burner according to the second aspect of the invention, in addition to the effects of the first aspect, a combined flame formed by combining two flames formed in a pair of flame openings located on both sides of the concave portion is projected. Since it is drawn to the part side, the lift of the combined flame can be suppressed.

FIG. 2 is a side view of the gas burner 1. FIG. 3 is a bottom view of the burner head 3. FIG. 3 is a perspective view of a burner head 3. It is the elements on larger scale around main flame opening 21A, 21B for detection of burner head 3. FIG. 3 is a diagram showing a state in which flames F1 and F2 are formed in main flame openings 21A and 21B for detection of a burner head 130. FIG. 9 is a view showing a state in which the flames formed respectively on the detection main flame openings 21A and 21B of the burner head 230 are combined to form a flame F3. It is a figure which shows the state which the front-end | tip of the flame F3 formed in the main flame opening 21A, 21B for detection of the burner head 3 divided | segmented into F4 part and F5 part. FIG. 3 is a partially enlarged view around a recess 31 of a burner head 330. FIG. 4 is a partially enlarged view around a recess 31 of a burner head 430. FIG. 4 is a partially enlarged view of a periphery of a recess 31 of a burner head 530.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The gas burner 1 of this embodiment shown in FIG. 1 is for a gas stove, and is used as a burner for a built-in stove incorporated in a kitchen table or the like or a table stove mounted on a table or the like.

  The gas burner 1 shown in FIG. 1 is installed in a stove housing in a state of being exposed upward from a burner opening formed in a top plate of a stove (not shown). Goku is placed on the top plate so as to surround the part exposed from the burner opening. Thereby, the cooking container such as a pot placed on the pit is heated by the flame formed in the gas burner 1.

  As shown in FIG. 1, the gas burner 1 includes a burner main body 2, a burner head 3, a burner cover 4, and the like. A gas supply pipe (not shown) is connected to the burner main body 2. A mixing chamber (not shown) is formed inside the burner main body 2. The gas supply pipe communicates with the mixing chamber. A nozzle (not shown) for discharging gas into the gas supply pipe is provided at the other end of the gas supply pipe opposite to the one end connected to the burner main body 2. When the gas is discharged from the nozzle into the gas supply pipe, the air around the nozzle is sucked into the gas supply pipe together with the gas as primary air. The gas and the primary air are supplied to the mixing chamber via the gas supply pipe, and are mixed in the mixing chamber. Thereby, in the burner main body 2, a mixed gas in which the gas and the primary air are mixed is generated.

  The heating power of the gas burner 1 is adjusted by operating a heating power adjusting device (not shown) provided in a supply path for supplying gas to the nozzle. The burner head 3 is mounted on the upper part of the burner main body 2 and forms a plurality of flame openings to be described later with the burner main body 2. The burner cover 4 is fixed to the upper part of the burner head 3 and prevents boiled juice and the like from falling into the housing of the stove through the inner peripheral space of the burner head 3.

  The structure of the burner head 3 will be described with reference to FIGS. The burner head 3 includes an upper plate 11 and a cylindrical portion 12. The upper plate 11 is formed in a substantially annular shape in plan view, and closes an upper opening of the mixing chamber in the burner main body 2. The cylindrical portion 12 is formed in a substantially cylindrical shape, and extends downward from the inner peripheral edge of the upper plate 11. When the burner head 3 is mounted on the upper part of the burner main body 2, the upper plate 11 is mounted on the upper part of the burner main body 2, and the cylindrical portion 12 is inserted inside the burner main body 2. A secondary air passage is formed at the center of the cylindrical portion 12.

  The upper plate 11 includes a cylindrical wall 15 that protrudes downward along the outer peripheral edge of the lower surface. The cylindrical wall 15 is seated on an upper seating surface 2 </ b> A of the burner main body 2. The lower surface of the cylindrical wall 15 is formed in a tapered shape that is inclined upward toward the outside in the radial direction, similarly to the seating surface 2A of the burner main body 2. By seating such a cylindrical wall 15 on the seating surface 2A of the burner main body 2, on the outer peripheral surface of the cylindrical wall 15, a plurality of main flame ports 21 vertically longer and a plurality of flame stabilizers vertically shorter. A mouth 22 is formed.

  On the lower surface of the upper plate 11, a plurality of gas supply grooves 50 are provided in regions other than the P1 to P6 regions (see FIG. 2) corresponding to the six swords (not shown) when installed on the stove. It is formed radially with reference to the center of the plate 11. Of the P1 to P6 areas, the P4 area is provided with positioning protrusions 16 vertically. The projection 16 is fitted from above into a positioning hole (not shown) provided in the seating surface 2A of the burner main body 2. The mixed gas generated in the mixing chamber of the burner body 2 flows radially outward along the plurality of gas supply grooves 50 and is guided to the cylindrical wall 15. The mixed gas guided to the cylindrical wall 15 is ejected from the main flame port 21 and the flame holding port 22. The jetted gas mixture is ignited by an igniter (not shown), and a flame is formed in the main flame opening 21 and the flame holding opening 22.

  Specifically, on the lower surface of the cylindrical wall 15, a large number of deep grooves are vertically provided at equal intervals along the circumferential direction in a region excluding the regions P <b> 1 to P <b> 6. A large number of main flame ports 21 are formed by these many deep concave grooves and the seating surface 2A of the burner main body 2. The main flame port 21 is formed in a slit shape vertically long, and opens obliquely upward with respect to the outside. Then, a main flame is formed by burning the mixed gas ejected from the main flame port 21.

  On the lower surface of the cylindrical wall 15, a shallow groove is vertically provided in a region excluding the regions P <b> 1 to P <b> 6 and between a number of deep grooves arranged in the circumferential direction. A large number of flame holding ports 22 are formed by the large number of shallow grooves and the bearing surface 2A of the burner body 2. Then, a flame holding is formed by burning the mixed gas ejected from the flame holding port 22. Also, on the lower surface of the cylindrical wall 15, three shallow grooves arranged vertically adjacent to each other in the circumferential direction are provided vertically in the P1 to P6 regions. Therefore, in the P1 to P6 regions corresponding to the virtues, these three shallow grooves and the seating surface 2A of the burner main body 2 form three flame cavities 23 for the virtue nail in a circumferential direction. You.

  An ignition projection 17 projecting radially outward is provided at a portion corresponding to the P1 region on the outer peripheral surface of the cylindrical wall 15. The ignition projection 17 when installed on the stove is arranged so as to face the igniter 91 (see FIG. 2). By causing the igniter 91 to discharge between the ignition protrusion 17 and the gas ejected from the three flame holders 23 for the three-sided claw corresponding to the P1 region, the gas is ignited, and a large number of the main flames 21 and the flame stabilizer The port 22 is ignited sequentially. In the P1 to P6 regions, the main flame ports 21 are largely separated from each other, but the flame sequentially moves through the three flames 23 for the five nails, so that all the main flame ports 21 and the flame port 22 are moved. Ignite.

  As shown in FIGS. 3 and 4, on the outer peripheral surface of the cylindrical wall 15, at a position facing the thermocouple 92 for detecting the ignition (see FIG. 2), a predetermined distance ( A recess 31 formed by being recessed (for example, about 1 mm) is provided, and a pair of main flame openings 21A and 21B for detection are provided so as to sandwich the recess 31 from both sides in the circumferential direction. One shallow groove is provided vertically on the lower surface of the concave portion 31. One flame holding port 22 is formed between the pair of main detecting flame ports 21A and 21B by the shallow groove and the bearing surface 2A of the burner main body 2. As will be described later, the thermocouple 92 detects a combined flame F3 (see FIG. 7) formed on the pair of main flame ports 21A and 21B for detection. The flame formed in the flame holding port 22 holds the combined flame F3.

  Further, as shown in FIG. 4, a convex portion 32 is provided on an upper portion of the outer surface of the concave portion 31. The convex portion 32 extends vertically from a substantially central position in the left-right direction (width direction) of the upper end of the outer surface of the concave portion 31 to a substantially central position in the vertical direction when the concave portion 31 is viewed from the front. When viewed from the side, it is formed in a substantially rectangular shape protruding radially outward of the cylindrical wall 15 from the outer surface of the recess 31. The base of the projection 32 that is connected to the outer surface of the recess 31 is tapered. Further, a protrusion 35 is provided on the outer surface of the cylindrical wall 15 immediately above the upper end of the recess 31. The protruding portion 35 is formed in the shape of an elongate and substantially rectangular eave in a plan view that protrudes substantially horizontally radially outward from the outer surface of the cylindrical wall 15. The protruding portion 35 covers a space enclosed between the pair of main flame openings 21A and 21B for detection and the outer surface of the recess 31 from above.

Referring to FIGS. 4 to 7, a description will be given of the optimization of the flame shape to be detected by the thermocouple 9 2. This embodiment, since the optimization of the flame is detected by the thermocouple 9 2, as described above, the pair of detecting main flame hole 21A, the recessed portion 31 between 21B provided, outside the recessed portion 31 The protrusion 32 is provided on the upper part of the side surface (see FIG. 4). Therefore, the effects of providing these will be described below in order using two comparative examples (burner heads 130 and 230) shown in FIGS. Note that the burner heads 130 and 230 are obtained by changing the shape between the pair of main flame openings 21A and 21B in the burner head 3 of the present embodiment. Since the structure of the burner heads 130 and 230 other than the part whose shape is changed is the same as that of the above-described burner head 3, the same reference numerals are used for the same parts. The positional relationship between the igniter 91 and the thermocouple 92 when installed on the stove is the same.

  First, the burner head 130 shown in FIG. 5 does not have the concave portion 31 and the convex portion 32 on the outer peripheral surface of the cylindrical wall 15 between the pair of main flame openings 21A and 21B for detection. The outer peripheral surface is the same as the outer peripheral surface. The thermocouple 92 is disposed at a position facing between the pair of main detecting ports 21A and 21B (see FIG. 2). The thermocouple 92 is heated by the flames F1 and F2 formed in the pair of main flame openings 21A and 21B, respectively, so that the ignition state of the burner is detected. However, in the burner including such a burner head 130, the flames F1 and F2 hit the thermocouple 92 and are cooled immediately after ignition or the like. F2 may be separated. In this case, the thermocouple 92 may not be able to detect the flames F1 and F2.

  Therefore, in order to suppress such a lift of the flames F1 and F2, a distance between the pair of main flame openings 21A and 21B for detection is set to a predetermined distance (center side) of the burner head 3 as in a burner head 230 shown in FIG. It is conceivable to make the recess 31 of the present embodiment by recessing (for example, about 1 mm). By providing the concave portion 31, the pair of main flame ports 21A and 21B for detection on both sides thereof are disposed at a position one step lower in the radial direction than the other main flame ports 21, so that the flames F1 and F2 are It is drawn into the center side of the burner head 3. Thereby, the lift of the flames F1 and F2 can be suppressed.

  However, even if the lift can be suppressed, the flames F1 and F2 are joined together by the flames, so that a large combined flame F3 may be formed. Since the combined flame F3 is larger than the flames F1 and F2, the combustion space becomes insufficient, and the flame length increases in search of secondary air. This locally reduces the distance between the bottom of the pot and the tip of the combined flame F3, which may cause poor combustion or soot.

  Therefore, in order to suppress an increase in flame length and poor combustion due to the provision of the concave portion 31, a convex portion 32 is formed on the outer surface of the concave portion 31 as in the burner head 3 of this embodiment shown in FIG. Is further provided. Thus, only the upper portion of the combined flame F3 can be separated into the F4 portion and the F5 portion, so that the flame length does not become larger than that of the combined flame F3 shown in FIG. Therefore, it is possible to suppress the combustion failure due to the flame coupling while maintaining the lift suppressing effect due to the provision of the concave portion 31. Furthermore, the combined flame F3 is drawn toward the protrusion 35 by the protrusion 35 provided substantially horizontally just above the upper end of the recess 31, so that the flame holding performance of the combined flame F3 can be further improved. The protrusion 35 has a function of preventing boiling over in addition to the flame holding function of the combined flame F3. Therefore, it is possible to prevent the broth from flowing through the pair of main flame openings 21A and 21B for detection and extinguishing the fire.

  As described above, the gas burner 1 of the present embodiment includes the burner main body 2 that supplies gas, and the burner head 3 mounted on the burner main body 2. On the outer surface of the cylindrical wall 15 provided on the outer peripheral portion of the burner head 3, a plurality of main flame ports 21 and flame holding ports 22 are provided side by side in the circumferential direction. Flames are formed in the main flame opening 21 and the flame holding opening 22 by burning the gas supplied from the burner main body 2. A concave portion 31 is provided on the outer surface of the cylindrical wall 15 at a portion facing the thermocouple 92 for ignition detection and between a pair of main flame openings 21A and 21B sandwiched from both sides in the circumferential direction. ing. The recess 31 is recessed and formed on the center side of the burner head 3. Further, a convex portion 32 that protrudes radially outward of the burner head 3 is provided at an upper portion of the outer surface of the concave portion 31.

By providing the recessed portion 31 at a position facing the thermocouple 9 2, recess pair of the detecting main flame hole 21A located on both sides of 31, two flames F1, F2 formed in 21B are bonded, bond A flame F3 is formed. Further, only the upper part of the combined flame F3 is separated into the parts F4 and F5 by the convex part 32 provided on the upper part of the outer surface of the concave part 31. Thereby, the flame holding property of the flame detected by the thermocouple 92 is improved, and the combustion failure due to the flame coupling can be prevented.

  Further, in the present embodiment, a protruding portion 35 that protrudes substantially horizontally radially outward is provided above the concave portion 31 on the outer surface of the cylindrical wall 15. The combined flame F3 formed by combining the two flames F1 and F2 formed on the pair of main flame openings 21A and 21B located on both sides of the recess 31 is drawn toward the protruding portion 35, so that the combined flame F3 is formed. Lift can be further suppressed.

  Note that the present invention is not limited to the above-described embodiment, and various modifications are possible. The gas burner 1 of the above embodiment is provided in the housing of the stove, but can also be applied to gas cookers and gas heaters other than the stove.

  Further, in the burner head 3 of the above embodiment, the shape of the convex portion 32 provided on the outer surface of the concave portion 31 of the cylindrical wall 15 is formed in a substantially rectangular plate shape projecting outward (FIG. 4). Reference), and the shape of the convex portion may be another shape. For example, like a convex part 132 provided on the outer surface of the concave part 31 of the burner head 330 shown in FIG. 8, the convex part 132 is formed in a substantially triangular prism shape inclined in a mountain shape from both sides in the circumferential direction toward the center. Is also good. Further, like a convex portion 232 provided on the upper side of the outer surface of the concave portion 31 of the burner head 430 shown in FIG. 9, an inverted triangular shape having one vertex below may be used. Further, like a convex portion 332 provided on the outer surface of the concave portion 31 of the burner head 530 shown in FIG. 10, a semicircular shape as viewed from the front that protrudes downward in a semicircular arc shape may be used.

  The positions of the lower ends of the projections 32, 132, 232, and 332 may be lower or upper than the positions shown in FIGS. 4 and 7 to 9. It is preferable not to make contact with the lower end of the side surface. Further, it is preferable that the front end portions of the convex portions 32, 132, 232, 332 toward the outside are flat surfaces parallel to the vertical direction.

  Further, in the above embodiment, the three flame stabilizing openings 23 for the gotoku claws are provided on the lower surface of the cylindrical wall 15 at the portions corresponding to the P1 to P6 regions, respectively. The number need not be three, but may be one, two, or three or more. Preferably, the number is plural, and it may be determined according to the width of the gotoku claws.

  In the above embodiment, the recess 31 is recessed by about 1 mm between the pair of main flame openings 21A and 21B toward the center of the burner head 3 with respect to the outer surface of the cylindrical wall 15. However, the distance to be recessed is not limited to 1 mm, and may be further recessed. Further, the depression may be made shallower than 1 mm.

  Further, a plurality of gas supply grooves 50 are radially formed on the lower surface of the upper plate 11 of the burner head 3 of the above embodiment, but the gas supply grooves 50 may be omitted. Further, the burner head 3 of the above embodiment is a dedicated product of Gotoku having six Gotoku claws, but the position of the three Gotoku claws flame holding ports 23 may be changed according to the number and positions of Gotoku claws. I just need.

DESCRIPTION OF SYMBOLS 1 Gas burner 2 Burner main body 3 Burner head 21 Main flame port 21A Main flame port 21B for detection Main flame port 22 for detection 22 Flame holding port 31 Depressed part 32 Convex part 35 Projection part 132 Convex part 232 Convex part 330 Burner head 332 Convex part 430 Burner head 530 Burner head

Claims (2)

A burner body for supplying gas,
A gas burner including a burner head mounted on the burner body,
A plurality of flame ports which are provided in the outer peripheral portion of the burner head in a circumferential direction and in which gas supplied from the burner body is burned to form a flame,
Of the outer peripheral portion, a concave portion provided between a pair of the flame ports that sandwiches a portion facing the thermocouple for ignition detection from both sides in the circumferential direction, and formed by being recessed and recessed on the center side of the burner head. When,
A protrusion provided on an upper side of an outer surface of the recess, and projecting radially outward of the burner head from the outer surface of the recess.
The height of the outer surface of the convex portion that is arranged radially outward is the same as the portion of the outer peripheral portion of the burner head that sandwiches the pair of the flame ports from both sides in the circumferential direction. A gas burner characterized by: The gas burner according to claim 1, further comprising a protrusion provided horizontally above the recess and protruding outward in the radial direction.

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