JP2017020705A - Gas burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas burner capable of improving a flame holding characteristic of a flame formed at a pair of flame holes for thermocouples and preventing poor combustion through flame connection.SOLUTION: An outer surface of a cylindrical wall 15 arranged at an outer peripheral part of a burner head 3 is provided with a plurality of main flame ports 21 and flame holding ports 22 alternatively in a peripheral direction. Recesses 31 are arranged between a pair of detection main flame ports 21A, 21B and portions opposing against thermocouples. The recesses 31 are recessed at the center side of the burner head 3 and formed. Accordingly, although two flame lifts formed at the detection main flame ports 21A, 21B are restricted, a combined flame F3 having adjoining flames to be connected is formed. The combined flame F3 is separated into parts F4 and F5 only at its upper part by a protrusion part 32 arranged at the outer side surface upper part of the recesses 31. Accordingly, a flame holding characteristic of a flame detected by the thermocouple is improved and poor combustion through the flame combination can be prevented.SELECTED DRAWING: Figure 7

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 placed on the burner body. A large number of gas supply grooves are formed radially on the lower surface of the burner head. The gas supplied from the burner body flows through the gas supply groove, and is ejected from a 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 the ignition state. For example, there is a gas burner in which a pair of adjacent flame nozzles among a plurality of flame nozzles is used as a detection flame nozzle, and a thermocouple is provided at a position facing the pair of flame nozzles 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 heating the thermocouple by two flames formed in a pair of detection flame ports.

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

Japanese Patent Laying-Open No. 2015-4456

  However, in the gas burner described in Patent Document 1, the flames formed in the pair of detection grooves sometimes come close to each other and are combined. In that case, since the combustion space is insufficient, the flame length increases upward in search of secondary air. As a result, the distance between the pan bottom and the flame tip is locally reduced, which may cause poor combustion and soot.

  An object of the present invention is to provide a gas burner capable of improving the flame holding property of a flame formed at a pair of flame mouths for a thermocouple and preventing combustion failure due to flame coupling.

  A gas burner according to a first aspect of the present invention is a gas burner comprising a burner main body for supplying gas and a burner head mounted on the burner main body, and is provided side by side in the circumferential direction on the outer peripheral portion of the burner head. A plurality of flame openings in which a gas supplied from the burner body is burned to form a flame, and a pair of the outer peripheral portion that sandwiches a portion facing the ignition detection thermocouple from both sides in the circumferential direction. A recess formed between the flame openings and recessed in the center side of the burner head, and an upper portion of the outer surface of the recess, the outer side in the radial direction from the outer surface of the recess And a projecting portion that protrudes from the surface.

  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 of the present invention, a gas burner is provided horizontally above the indented portion and includes a protruding portion that protrudes outward in the radial direction. .

  In the gas burner according to the first aspect of the present invention, the two flames formed in the pair of flame ports located on both sides of the dent portion are combined by providing the dent portion at a position facing the thermocouple. Further, 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 combustion failure due to the flame coupling can be prevented.

  In the gas burner of the invention according to claim 2, in addition to the effect of the invention of claim 1, a combined flame formed by combining two flames formed at a pair of flame ports located on both sides of the recess is protruding. Since it is drawn to the part side, the lift of the combined flame can be suppressed.

1 is a side view of a gas burner 1. FIG. 4 is a bottom view of the burner head 3. FIG. 2 is a perspective view of a burner head 3. FIG. FIG. 3 is a partially enlarged view around detection main flame ports 21A and 21B of the burner head 3; It is a figure which shows the state by which the flames F1 and F2 were formed in the detection main flame mouths 21A and 21B of the burner head 130. FIG. It is a figure which shows the state in which the flame formed in each of the detection main flame mouths 21A and 21B of the burner head 230 couple | bonded, and the flame F3 was formed. It is a figure which shows the state which the front-end | tip of the flame F3 formed in the main flame mouths 21A and 21B for detection of the burner head 3 divided | segmented into F4 part and F5 part. FIG. 4 is a partially enlarged view around a recessed portion 31 of a burner head 330. FIG. 4 is a partially enlarged view around a recessed portion 31 of a burner head 430. FIG. 4 is a partially enlarged view around a recessed portion 31 of a burner head 530.

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

  A gas burner 1 shown in FIG. 1 is installed in a casing of a stove in a state where it is exposed upward from a burner opening formed on a top plate of a stove (not shown). On the top plate, virtues are placed so as to surround the portion exposed from the burner opening. Thereby, cooking containers, such as a pan placed on Gotoku, are heated by the flame formed in the gas burner 1.

  As shown in FIG. 1, the gas burner 1 includes a burner body 2, a burner head 3, a burner cover 4, and the like. A gas supply pipe (not shown) is connected to the burner body 2. A mixing chamber (not shown) is formed inside the burner 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 body 2. When gas is discharged from the nozzle into the gas supply pipe, the air around the nozzle is sucked into the gas supply pipe as primary air together with the gas. The gas and the primary air are supplied to the mixing chamber through the gas supply pipe unit and mixed in the mixing chamber. Thereby, in the burner main body 2, the mixed gas which mixed gas and primary air is produced | 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 placed on the upper part of the burner main body 2 and forms a plurality of flame outlets to be described later between the burner main body 2. The burner cover 4 is fixed to the upper part of the burner head 3 and prevents the simmered juice or the like from falling into the casing 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 cylinder portion 12. The upper plate 11 is formed in a substantially annular shape in plan view and closes the upper opening of the mixing chamber in the burner body 2. The cylindrical portion 12 is formed in a substantially cylindrical shape and extends downward from the inner peripheral edge portion of the upper plate 11. In a state where the burner head 3 is placed on the upper part of the burner body 2, the upper plate 11 is placed on the upper part of the burner body 2, and the cylinder part 12 is inserted inside the burner body 2. A secondary air passage is formed in 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 the upper seating surface 2 </ b> A of the burner body 2. Similar to the seating surface 2A of the burner body 2, the lower surface of the cylindrical wall 15 is formed in a tapered shape that is inclined upward toward the radially outer side. By seating such a cylindrical wall 15 on the seat surface 2A of the burner body 2, a plurality of main flame ports 21 that are long in the vertical direction and a plurality of flame holders that are short in the vertical direction are formed on the outer peripheral surface of the cylindrical wall 15. A mouth 22 is formed.

  A plurality of gas supply grooves 50 are provided on the lower surface of the upper plate 11 except for the P1 to P6 regions (see FIG. 2) corresponding to the six virtue claws (not shown) when installed on the stove. It is formed radially with the center of the plate 11 as a reference. Of the P1 to P6 regions, the positioning projections 16 are vertically provided in the P4 region. The protrusion 16 is fitted from above into a positioning hole (not shown) provided on the seat surface 2A of the burner 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 ejected mixed gas is ignited by an igniter (not shown), and a flame is formed at the main flame port 21 and the flame holding port 22.

  Specifically, on the lower surface of the cylindrical wall 15, a large number of deep concave grooves arranged at equal intervals along the circumferential direction are provided vertically in the region excluding the P1 to P6 regions. A large number of main flame ports 21 are formed by the large number of deep concave grooves and the seating surface 2 </ b> A of the burner body 2. The main flame mouth 21 is formed in a slit shape so as to be long in the vertical direction, and opens obliquely upward with respect to the outside. And the main flame is formed when the mixed gas which spouts from the main flame opening 21 burns.

  On the lower surface of the cylindrical wall 15, shallow concave grooves are vertically provided between a large number of deep concave grooves arranged in the circumferential direction in a region excluding the P1 to P6 regions. A large number of flame holding ports 22 are formed by the large number of shallow grooves and the seating surface 2 </ b> A of the burner body 2. The flame holding is formed by the combustion of the mixed gas ejected from the flame holding port 22. In addition, on the lower surface of the cylindrical wall 15, three shallow concave grooves arranged adjacent to each other in the circumferential direction are vertically provided in the P1 to P6 regions. Therefore, in the P1 to P6 region corresponding to the five virtues, the three flame retaining ports 23 for the five virtue nails are formed side by side in the circumferential direction by the three shallow grooves and the seat surface 2A of the burner body 2. The

  In addition, 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 protrusion 17 when installed on the stove is arranged so as to face the igniter 91 (see FIG. 2). When the igniter 91 is discharged between the ignition projections 17, it is ignited by the gas ejected from the three virtuary nail flame holding ports 23 corresponding to the P1 region, and the multiple main flame ports 21 and flame holdings. The opening 22 is ignited sequentially. In the P1 to P6 region, the main flame mouths 21 are largely separated from each other, but the flame sequentially moves through the three five virtue nail flame holding mouths 23, so that all the main flame mouths 21 and the flame holding mouths 22 are moved. Ignited.

  As shown in FIGS. 3 and 4, a predetermined distance (on the center side of the burner head 3) is located on the outer peripheral surface of the cylindrical wall 15 at a position facing the ignition detecting thermocouple 92 (see FIG. 2). (For example, about 1 mm) A recessed portion 31 formed to be recessed is provided, and a pair of main flame ports for detection 21A and 21B are provided so as to sandwich the recessed portion 31 from both sides in the circumferential direction. One shallow groove is vertically provided on the lower surface of the recess 31. By this shallow groove and the seat surface 2A of the burner body 2, one flame holding port 22 is formed between the pair of detection main flame ports 21A and 21B. As will be described later, the thermocouple 92 detects a combined flame F3 (see FIG. 7) formed in the pair of main flame ports for detection 21A and 21B. 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 the upper portion of the outer surface of the concave portion 31. The convex portion 32 extends in a vertical direction from a substantially central position in the left-right direction (width direction) of the upper end portion 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 from the outer surface of the recess 31 to the radially outer side of the cylindrical wall 15. In addition, the base part connected with the outer surface of the recessed part 31 in the convex part 32 is formed in the taper shape. Further, on the outer surface of the cylindrical wall 15, a protruding portion 35 is provided immediately above the upper end portion of the recessed portion 31. The projecting portion 35 is formed in an elongated rectangular shape in a plan view that projects substantially horizontally from the outer surface of the cylindrical wall 15 outward in the radial direction. The protrusion 35 covers the space surrounded by the pair of main flame ports for detection 21 </ b> A and 21 </ b> B and the outer surface of the recess 31 from above.

  The optimization of the flame shape detected by the thermocouple 91 will be described with reference to FIGS. In the present embodiment, in order to optimize the flame detected by the thermocouple 91, as described above, the recessed portion 31 is provided between the pair of detection main flame ports 21A and 21B, and the outer surface of the recessed portion 31 is provided. A convex portion 32 is provided on the upper portion (see FIG. 4). Therefore, the effects obtained by providing these will be described in order using the two comparative ratios (burner heads 130 and 230) shown in FIGS. The burner heads 130 and 230 are obtained by changing the shape between the pair of detection main flame ports 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 burner head 3 described above, the same reference numerals are used for the same parts. The positional relationship between the igniter 91 and the thermocouple 92 when installed in 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 between the pair of main flame ports for detection 21 </ b> A and 21 </ b> B on the outer peripheral surface of the cylindrical wall 15. The outer peripheral surface is the same as the outer peripheral surface. The thermocouple 92 is disposed at a position facing the pair of detection main flame ports 21A and 21B (see FIG. 2). The thermocouple 92 is heated by flames F1 and F2 formed in the pair of detection main flame ports 21A and 21B, respectively, so that the ignition state of the burner is detected. However, in a burner equipped with such a burner head 130, immediately after ignition, the flames F1 and F2 hit the thermocouple 92 and are cooled, so the flames F1 and F2 are lifted, and the flames F1 and F2 are lifted from the thermocouple 92. F2 may leave. In this case, the thermocouple 92 may not be able to detect the flames F1 and F2.

  Therefore, in order to suppress such lift of the flames F1 and F2, a predetermined distance between the pair of detection main flame ports 21A and 21B is set to the center side of the burner head 3 as in the burner head 230 shown in FIG. For example, it is conceivable to provide a recess 31 according to this embodiment. By providing the recessed portion 31, the pair of detection main flame ports 21A and 21B on both sides thereof are arranged at positions that are one step lower in the radial direction than the other main flame ports 21, so that the flames F1 and F2 are It is pulled into the center side of the burner head 3. Thereby, the lift of flame F1, F2 can be suppressed.

  However, even if the lift can be suppressed, the large flames F3 may be formed because the flames F1 and F2 come close to each other and are combined. Since the combined flame F3 is larger than the flames F1 and F2, the combustion space is insufficient, and the flame length increases due to the secondary air. As a result, the distance between the bottom of the pan and the tip of the combined flame F3 is locally reduced, which may result in poor combustion and soot.

  Therefore, in order to suppress an increase in the flame length and poor combustion due to the provision of the recess 31, the protrusion 32 is formed on the upper portion of the outer surface of the recess 31 as in the burner head 3 of the present embodiment shown in FIG. Is further provided. As a result, only the upper part of the combined flame F3 can be separated into the F4 portion and the F5 portion, so that the flame length does not increase compared to the combined flame F3 shown in FIG. Accordingly, 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 recess 31. Furthermore, since the combined flame F3 is drawn toward the protruding portion 35 by the protruding portion 35 provided substantially horizontally just above the upper end portion of the recessed portion 31, the flame holding property of the combined flame F3 can be further improved. In addition to the flame holding function of the combined flame F3, the protruding portion 35 also has a function of preventing boiling. Therefore, it is possible to prevent the broth from flowing into the pair of detection main flame ports 21A and 21B and extinguishing the fire.

  As described above, the gas burner 1 according to this embodiment includes the burner body 2 that supplies gas and the burner head 3 that is placed on the burner body 2. A plurality of main flame ports 21 and flame holding ports 22 are provided side by side in the circumferential direction on the outer surface of the cylindrical wall 15 provided on the outer peripheral portion of the burner head 3. A flame is formed in the main flame opening 21 and the flame holding opening 22 by burning the gas supplied from the burner body 2. Of the outer surface of the cylindrical wall 15, a recess 31 is provided between the pair of detection main flame ports 21 </ b> A and 21 </ b> B that are opposed to the ignition detecting thermocouple 92 and sandwiched from both sides in the circumferential direction. ing. The recessed portion 31 is formed to be recessed on the center side of the burner head 3. Further, a convex portion 32 protruding outward in the radial direction of the burner head 3 is provided on the upper portion of the outer surface of the concave portion 31.

  By providing the recessed portion 31 at a position facing the thermocouple 91, the two flames F1 and F2 formed at the pair of detection main flame ports 21A and 21B located on both sides of the recessed portion 31 are combined to form a combined flame. F3 is formed. Furthermore, 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 recessed 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.

  In the present embodiment, a protruding portion 35 that protrudes substantially horizontally outward in the radial direction is provided above the recessed portion 31 on the outer surface of the cylindrical wall 15. Since the combined flame F3 formed by combining the two flames F1 and F2 formed on the pair of detection main flame ports 21A and 21B located on both sides of the dent portion 31 is drawn toward the protruding portion 35, the combined flame F3 is drawn. Can be further suppressed.

  In addition, this invention is not limited to the said embodiment, A various change is possible. Although the gas burner 1 of the said embodiment is provided in the housing | casing of a stove, it is applicable also to gas cookers and gas heaters other than a stove.

  Moreover, in the burner head 3 of the said embodiment, although the shape of the convex part 32 provided in the outer surface of the recessed part 31 of the cylindrical wall 15 is formed in the substantially rectangular plate shape which protrudes outside (FIG. 4). The shape of the convex portion may be other than this. For example, like the convex part 132 provided in the upper part of the outer surface of the recessed part 31 of the burner head 330 shown in FIG. 8, it is formed in the substantially triangular prism shape which inclines in a mountain shape toward the center from the circumferential direction both sides. Also good. Further, it may have an inverted triangular shape in front view having one apex on the lower side, like a convex portion 232 provided on the outer surface of the concave portion 31 of the burner head 430 shown in FIG. Further, it may have a semicircular shape in a front view that protrudes downward in a semicircular arc shape, like a convex portion 332 provided on the outer surface of the concave portion 31 of the burner head 530 shown in FIG.

  The positions of the lower end portions of the convex portions 32, 132, 232, and 332 may be lower or higher than the positions shown in FIGS. 4 and 7 to 9. It is preferable not to contact the lower end of the side surface. Moreover, it is preferable that the front-end | tip part which goes outside these convex parts 32,132,232,332 is a plane parallel to an up-down direction.

  Moreover, in the said embodiment, in the lower surface of the cylindrical wall 15, in the part corresponding to P1-P6 area | region, respectively, the three flame guard openings 23 for 5 virtue nails are each provided, The number may not be three, but may be one, two, three or more. The number is preferably a plurality, and may be determined according to the width of the five virtue claws.

  Moreover, although the recessed part 31 of the said embodiment is dented about 1 mm to the center side of the burner head 3 with respect to the outer surface of the cylindrical wall 15 between a pair of main flame ports 21A for detection, and 21B. The distance to be recessed is not limited to 1 mm, and may be further recessed. Further, it may be recessed more than 1 mm.

  Moreover, although the several gas supply groove | channel 50 is radially formed in the lower surface of the upper board 11 of the burner head 3 of the said embodiment, you may abbreviate | omit the gas supply groove | channel 50. FIG. In addition, the burner head 3 of the above embodiment is an exclusive product for Gotoku having 6 Gotoku claws. However, depending on the number and position of Gotoku claws, the positions of the three flame guard ports 23 for Gotoku can be changed. That's fine.

DESCRIPTION OF SYMBOLS 1 Gas burner 2 Burner main body 3 Burner head 21 Main flame opening 21A Detection main flame opening 21B Detection main flame opening 22 Flame holding opening 31 Recessed part 32 Convex part 35 Protruding 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 comprising a burner head mounted on the burner body,
A plurality of flame outlets that are provided side by side in the circumferential direction at the outer peripheral portion of the burner head and in which a gas supplied from the burner body burns to form a flame,
Of the outer peripheral portion, a recess portion formed between a pair of the flame outlets that sandwiches a portion facing the ignition detection thermocouple from both sides in the circumferential direction, and is recessed in the center side of the burner head. When,
A gas burner comprising a convex portion provided on an outer surface of the concave portion and protruding outward in the radial direction from the outer surface of the concave portion. 2. 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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