Combination burner and gas stove

Abstract

A sub-primary burner is configured to include a sub-burner 4 and a primary burner 5 surrounding the sub-burner 4, and is provided on a stove top 2 with a sub-burner inflow pipe 45 and a sub-burner nozzle 46 facing an upstream end of the sub-burner inflow pipe 45, a front end of the sub-burner nozzle being positioned more radially inward than an outer periphery of the primary burner 5 when viewed from above at a position lower than the primary burner 5, and primary air being sufficiently drawn even if the length of the sub-burner inflow pipe is short. The sub-burner main body 41 is formed to have an extension 413 extending more downward than a sub-burner distribution chamber 43. An internal gap 414 communicating with the sub-burner distribution chamber 43 is provided in a circumferential prescribed range of the extension 413. A circumferential central portion of the internal gap 414 is formed as a narrow portion 4141 having a radial width smaller than the radial width of other portions of the internal gap. The sub-burner inflow pipe 45 is arranged to communicate with the narrow portion 4141 of the internal gap 414 at a downstream end and extend radially outward along a line in the radial direction passing through the circumferential center of the narrow portion.

Description

Technical Field

[0001] The present invention relates to a master burner installed in a gas stove and a gas stove having the master burner. Background Technology

[0002] Previously, a structure described in Patent Document 1 was known as such a master burner. Regarding this structure, the slave burner includes: a slave burner body exposed on the top plate of a gas stove; a slave burner cover mounted on the slave burner body to demarcate a slave burner distribution chamber between itself and the slave burner body, and having multiple slave burner flame holes for ejecting a mixed gas from the slave burner distribution chamber; and a slave burner inlet pipe extending horizontally from the slave burner body on the top plate of the gas stove, supplying the slave burner distribution chamber with a mixture of gas ejected from a nozzle hole at the front end of a slave burner nozzle located facing an opening at the upstream end of the slave burner inlet pipe, and primary air drawn in by the opening at the upstream end of the slave burner inlet pipe. In addition, the mother burner includes: an annular mother burner body exposed on the top plate of the gas stove and surrounding the daughter burner body; an annular mother burner cover mounted on the mother burner body to delineate a mother burner distribution chamber between the cover and the mother burner body, and having multiple mother burner flame holes for ejecting mixed gas from the mother burner distribution chamber; and a mother burner inlet pipe extending from the mother burner body to below the top plate of the gas stove, supplying the mother burner distribution chamber with: gas ejected from the nozzle hole at the front end of the mother burner nozzle provided with an opening facing the upstream end of the mother burner inlet pipe, and a mixture of gas and primary air attracted by the opening at the upstream end of the mother burner inlet pipe.

[0003] However, in typical dual-burner systems, the daughter burner inlet pipe extends downwards from the top plate of the gas stove, similar to the mother burner inlet pipe. However, this can lead to a situation where, if the cabinet door containing the gas stove is quickly opened at the lowest possible flame setting (only when the daughter burner is burning at a low flame), a negative pressure forms inside the cabinet. This negative pressure then acts on the opening at the upstream end of the daughter burner inlet pipe. Furthermore, this can sometimes cause the daughter burner flame to be introduced into the daughter burner distribution chamber, resulting in a misfire.

[0004] In contrast, regarding the structure described in Patent Document 1, the sub-burner inlet pipe is disposed on the top plate of the gas stove. Therefore, even if the cabinet becomes under negative pressure, this negative pressure will not act on the opening at the upstream end of the sub-burner inlet pipe, thus preventing misfire in the sub-burner. However, when the sub-burner inlet pipe is disposed on the top plate of the gas stove, the sub-burner nozzle is also disposed on the top plate of the gas stove. Moreover, when viewed from above, the sub-burner nozzle becomes conspicuous, thus causing visual damage. Therefore, regarding the structure described in Patent Document 1, the tip of the sub-burner nozzle is positioned lower than the main burner body and radially inward from the outer periphery of the main burner body when viewed from above.

[0005] Regarding the mother-daughter burner described in Patent Document 1, it is configured such that the daughter burner inlet pipe has a venturi portion near its upstream end. Furthermore, when combustion gas is ejected from the nozzle orifice of the daughter burner nozzle, primary air is drawn in from the opening at the upstream end of the daughter burner inlet pipe using the negative pressure generated in the venturi portion. In this case, to increase the amount of primary air drawn in, the length of the daughter burner inlet pipe needs to be extended. However, the upstream end of the daughter burner inlet pipe needs to be located further radially inward than the front end of the daughter burner nozzle, which is located radially inward compared to the outer periphery of the mother burner body when viewed from above. Therefore, the length of the daughter burner inlet pipe cannot be set to be sufficiently long. As a result, without causing a primary air shortage, the maximum firepower of the daughter burner cannot be set sufficiently high.

[0006] Furthermore, even if the maximum heat output of the sub-burner is set to a high level, in order to extend the length of the sub-burner inlet pipe to avoid insufficient primary air, it is necessary to increase the outer diameter of the main burner body by positioning the tip of the sub-burner nozzle further radially inward than the outer periphery of the main burner body when viewed from above. However, in this case, the flame of the main burner comes into partial contact with the outer periphery of the bottom surface of the cooking container heated by both the sub-burners, resulting in a decrease in thermal efficiency.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: CN212691761U Summary of the Invention

[0010] In view of the above problems, the present invention aims to provide a master burner and a gas stove equipped with a master burner, which can fully draw in primary air even if the length of the inlet pipe of the slave burner is short, and can set the maximum firepower of the slave burner to a large value without increasing the outer diameter of the master burner body.

[0011] To address the aforementioned issues, the first invention of this application is a mother-daughter burner, disposed in a gas stove, comprising a daughter burner and a mother burner surrounding the daughter burner. The daughter burner includes: a daughter burner body exposed on the top plate of the gas stove; a daughter burner cover mounted on the daughter burner body to delineate a daughter burner distribution chamber between itself and the daughter burner body, and having a plurality of daughter burner flame holes for ejecting mixed gas from the daughter burner distribution chamber; and a daughter burner inlet pipe extending horizontally from the daughter burner body on the top plate of the gas stove, wherein the daughter burner inlet pipe directs the flow of gas into the daughter burner. The burner distribution chamber is supplied with a mixture of gas ejected from the nozzle orifice at the front end of the sub-burner nozzle, which is provided facing the opening at the upstream end of the sub-burner inlet pipe, and primary air drawn in from the opening at the upstream end of the sub-burner inlet pipe. The main burner comprises: an annular main burner body exposed on the top plate of the gas stove and surrounding the sub-burner body; an annular main burner cover mounted on the main burner body to delineate the main burner distribution chamber between itself and the main burner body, and having multiple main burner flame holes for ejecting the mixed gas from the main burner distribution chamber; and a main burner inlet pipe. It extends from the main burner body downwards towards the top plate of the gas stove, and supplies the main burner distribution chamber with a mixture of gas ejected from the nozzle orifice at the front end of the main burner nozzle, which is provided facing the opening at the upstream end of the main burner inlet pipe, and primary air drawn in from the opening at the upstream end of the main burner inlet pipe. The front end of the sub-burner nozzle is located further downwards than the main burner body and is positioned radially inwards than the outer periphery of the main burner body when viewed from above. The sub-burner body is characterized by having a component extending further downwards than the sub-burner distribution chamber. The extension section has an internal gap communicating with the sub-burner distribution chamber within a defined circumferential range. The central portion of the internal gap is formed as a narrow section with a radial width smaller than the radial width of the other portions of the internal gap. The sub-burner inlet pipe is configured such that its downstream end communicates with the narrow portion of the internal gap and extends radially outward along a line passing through the circumferential center of the narrow portion. The mixed gas flows from the narrow portion of the internal gap to the other portions of the internal gap via the sub-burner inlet pipe, thereby achieving the effect of drawing primary air from the opening at the upstream end of the sub-burner inlet pipe. Furthermore, the second invention of this application is a gas stove characterized by having the aforementioned master and slave burners of the first invention.

[0012] According to the present invention (first invention), based on the primary air suction effect obtained by the mixed gas flowing from a narrow portion of the internal void provided in the extension of the sub-burner body to the other portions of the internal void, i.e., the wide portion, primary air can be sufficiently drawn in even if the length of the sub-burner inlet pipe is short. Therefore, even without increasing the outer diameter of the main burner body, the tip of the sub-burner nozzle can be positioned radially inward from the outer periphery of the main burner body when viewed from above, and primary air deficiency can be avoided, thus enabling a larger maximum firepower setting for the sub-burner.

[0013] Furthermore, in this invention, preferably, a resistance-imposing part is provided to increase the ventilation resistance of the portion where the upper end of the narrow section of the internal void communicates with the sub-burner distribution chamber. This prevents the mixed gas from deflecting from the narrow section of the internal void towards the portion of the sub-burner distribution chamber directly above it, thus preventing uneven circumferential heat distribution in the sub-burner.

[0014] However, to improve the primary air suction effect, the radial width of the narrow portion of the internal void needs to be set quite small. When the inner and outer peripheral sidewalls of the internal void are formed by identical components, and the internal void is formed through demolding, the radial width of the narrow portion cannot be set quite small due to the need to ensure the strength of the demolding mold. Therefore, in this invention, it is preferable to use different components to form the inner and outer peripheral sidewalls of the internal void. This allows for a significant reduction in the radial width of the narrow portion, which is advantageous.

[0015] Furthermore, in this invention, preferably, on the inner circumference of the circumferential portion of the bottom wall of the mother burner body that corresponds to the daughter burner nozzle, an eave extending radially inward extends to a position that covers at least the upstream end of the daughter burner inlet pipe from above, and downwardly extending drooping wall portions are provided on both circumferential sides of this eave. Accordingly, even if cooking liquid drips between the mother burner body and the daughter burner body, it can prevent the cooking liquid from remaining in the nozzle orifice of the daughter burner nozzle.

[0016] Furthermore, in this invention, the sub-burner nozzle is positioned on the top plate of the gas stove. Therefore, cooking liquid may accumulate in the nozzle orifice at the front end of the sub-burner nozzle, causing nozzle orifice blockage. Here, if the front end of the sub-burner nozzle is positioned directly below the main burner body, cooking liquid can be prevented from directly accumulating in the nozzle orifice of the sub-burner nozzle. However, it is not possible to prevent cooking liquid from accumulating in the nozzle orifice of the sub-burner nozzle along the lower surface of the bottom wall of the main burner body. In this case, if the downward-extending skirt-like portion extends towards the outer periphery of the bottom wall of the main burner body, cooking liquid can be prevented from circulating back from the outer periphery of the main burner body to the lower surface of the bottom wall, thereby helping to prevent nozzle orifice blockage of the sub-burner nozzle.

[0017] Regarding the structure described in Patent Document 1, the front end of the sub-burner nozzle is also located directly below the main body of the main burner, and the downward-extending skirt-like portion extends towards the outer periphery of the bottom wall of the main body of the main burner. However, the lower end of the skirt-like portion is positioned higher than the nozzle orifice of the sub-burner nozzle. Here, between the top plate of the gas stove and the main burner, during combustion in the sub-burner, a strong airflow (airflow) is generated, drawn towards the sub-burner by the rising airflow produced by combustion. Therefore, if the lower end of the skirt-like portion is positioned higher than the nozzle orifice of the sub-burner nozzle, droplets of cooking liquid dripping from the lower end of the skirt-like portion may be trapped in the nozzle orifice of the sub-burner nozzle along with the airflow generated between the top plate and the main burner. Therefore, preferably, the lower end of the skirt-like portion is equal to or lower than the nozzle orifice of the sub-burner nozzle. Accordingly, it can also effectively prevent the scum from cooking liquid dripping from the lower end of the skirt-shaped part from getting stuck in the nozzle orifice of the daughter burner nozzle along the airflow generated between the top plate and the mother burner.

[0018] Furthermore, the second invention of this application is a gas stove, preferably, in the case where the main burner has the aforementioned skirt-shaped portion, a portion located radially inward compared to the skirt-shaped portion when viewed from above the top plate of the gas stove is provided with a raised portion that bulges upward compared to a portion of the top plate that is radially outward, and the tip of the sub-burner nozzle is located radially inward compared to the outline of the raised portion when viewed from above. Accordingly, it is also possible to prevent cooking liquid dripping from the skirt-shaped portion from flowing onto the top plate and remaining near the tip of the sub-burner nozzle in the nozzle orifice. Attached Figure Description

[0019] Figure 1 This is a perspective view of the main parts of a gas stove equipped with a mother-daughter burner according to an embodiment of the present invention.

[0020] Figure 2 Therefore Figure 1 A sectional side view cut along line II-II.

[0021] Figure 3 Therefore Figure 2 A top view cut along line III-III.

[0022] Figure 4 Therefore Figure 2 A sectional view cut along line IV-IV.

[0023] Figure 5 This is a perspective view of the exploded state of the mother-daughter burner in the embodiment. Detailed Implementation

[0024] Figure 1 , Figure 2 A gas stove equipped with a master burner A according to an embodiment of the present invention is shown. The gas stove has a top plate 2 covering the upper surface of the stove body 1. The top plate 2 is configured to include: a top plate body 21; and a cover plate 22, which prevents cooking liquids from seeping in from the burner opening 21a formed in the top plate body 21 and facing the master burner A. A burner rack 3, which surrounds the burner opening 21a and has a plurality of burner claws 31, is mounted on the top plate 2.

[0025] The mother-daughter burner A is configured to include a daughter burner 4 and a mother burner 5 surrounding the daughter burner 4. Furthermore, the firepower can be significantly varied, ranging from the minimum firepower that causes only the daughter burner 4 to burn at a weak flame to the maximum firepower that causes both the daughter burner 4 and the mother burner 5 to burn at a strong flame. Additionally, a thermocouple 6 for monitoring the flame of the daughter burner 4 is provided in the daughter burner 4, and an ignition electrode 7 for igniting the mother burner 5 is provided in the mother burner 5.

[0026] The sub-burner 4 includes: a sub-burner body 41 exposed on the top plate 2 of the gas stove; and a sub-burner cover 42 mounted on the sub-burner body 41. See also... Figure 5 The sub-burner body 41 has an outer cylinder 411 and an inner cylinder 412 composed of different components. The sub-burner cover 42 has a vertically arranged outer cylinder portion 421, which sits on the upper end of the outer cylinder 411 of the sub-burner body 41; and an inner cylinder portion 422, which is embedded within the inner cylinder 412 of the sub-burner body 41. Furthermore, an annular sub-burner distribution chamber 43 is defined between the sub-burner body 41 and the sub-burner cover 42. Multiple sub-burner flame holes 44 are formed in the outer cylinder portion 421 of the sub-burner cover 42 for ejecting the mixed gas from the sub-burner distribution chamber 43.

[0027] The sub-burner 4 also includes a sub-burner inlet pipe 45 extending horizontally from the sub-burner body 41 on the top plate 2 of the gas stove. A sub-burner nozzle 46 is provided on the top plate 2, facing the opening 451 at the upstream end of the sub-burner inlet pipe 45. The sub-burner nozzle 46 is mounted on a nozzle support 461, which is fixed to a mounting platform 11 fixed to the stove body 1, protruding from the top plate 22 through the cover plate 22. Gas is supplied to the sub-burner nozzle 46 via the sub-burner gas pipe 462 and the nozzle support 461. Furthermore, a mixture of gas ejected from the nozzle hole 46a at the front end of the sub-burner nozzle 46 and primary air drawn in from the opening 451 at the upstream end of the sub-burner inlet pipe 45 is supplied to the sub-burner distribution chamber 43 via the sub-burner inlet pipe 45.

[0028] The mother burner 5 includes: an annular mother burner body 51 exposed on the top plate 2 of the gas stove and surrounding the daughter burner body 41; and an annular mother burner cover 52 mounted on the mother burner body 51. See also... Figure 5 The main burner body 51 has an outer cylinder portion 512 and an inner cylinder portion 513 erected on the outer and inner peripheries of an annular bottom wall portion 511. The main burner cover 52 has an outer cylinder portion 521 seated at the upper end of the outer cylinder portion 512 of the main burner body 51, and an inner cylinder portion 522 externally fitted into the inner cylinder portion 513 of the main burner body 51. Furthermore, an annular main burner distribution chamber 53 is defined between the main burner body 51 and the main burner cover 52. Multiple main burner flame holes 54 are formed on the outer cylinder portion 521 of the main burner cover 52 for ejecting the mixed gas from the main burner distribution chamber 53. Additionally, on the upper surface of the main burner cover 52, radially extending slit-shaped flame holes 54a are formed for the propagation of combustion between the sub-burner 4 and the main burner 5.

[0029] The main burner 5 also includes a main burner inlet pipe 55 extending from the main burner body 51 to below the top plate 2 of the gas stove. Furthermore, the main burner distribution chamber 53 is supplied with a mixture of gas ejected from a nozzle orifice (not shown) at the front end of a main burner nozzle located at an opening facing the upstream end of the main burner inlet pipe 55, and primary air drawn in from the opening at the upstream end of the main burner inlet pipe 55. In addition, the main burner inlet pipe 55 is configured to include: a downstream side pipe 551, which is located on the lower surface of a portion circumferentially located on the bottom wall 511 of the main burner body 51 and extends below the top plate 2, fitting into a port portion 53a communicating with the main burner distribution chamber 53; and an upstream side pipe 552, which is connected to the lower end of the downstream side pipe 551 via a connecting pipe portion 552a and extends horizontally below the top plate 2. A venturi portion 552b is formed in the upstream side pipe 552, located near its upstream end. Furthermore, by utilizing the negative pressure generated in the venturi portion 552b when the gas is ejected from the nozzle orifice of the mother burner nozzle, primary air is drawn from the opening at the upstream end of the upstream side pipe 552, that is, the upstream end of the mother burner inlet pipe 55.

[0030] However, when the sub-burner nozzle 46 is positioned on the top plate 2 of the gas stove as in this embodiment, it becomes conspicuous when viewed from above, resulting in visual impairment. Therefore, the tip of the sub-burner nozzle 46 is positioned further below the main burner body 51 and radially inward from the outer periphery of the main burner body 51 when viewed from above. Here, when the sub-burner inlet pipe 45 is configured with a venturi section near its upstream end, similar to the main burner inlet pipe 55, the length of the sub-burner inlet pipe 45 needs to be extended to increase the primary air intake. However, since the upstream end of the sub-burner inlet pipe 45 needs to be located radially inward from the tip of the sub-burner nozzle 46, the length of the sub-burner inlet pipe 45 cannot be set to be sufficiently long. As a result, the maximum firepower of the sub-burner 4 cannot be set sufficiently high without causing insufficient primary air. Furthermore, even if the maximum heat output of the sub-burner 4 is set to a high level, in order to extend the length of the sub-burner inlet pipe 45 to avoid insufficient primary air, it is necessary to increase the outer diameter of the main burner body 51 so that the tip of the sub-burner nozzle 46 is located radially inward from the outer periphery of the main burner body 51 when viewed from above. However, in this case, the flame of the main burner 5 will come into contact with the area near the outer periphery of the bottom surface of the cooking container on the stove rack 3 heated by the main and sub-burners A, resulting in a decrease in thermal efficiency.

[0031] Therefore, in this embodiment, the sub-burner body 41 has an extension 413 that extends downward beyond the sub-burner distribution chamber 43. Also refer to... Figure 3 An internal void 414 communicating with the sub-burner distribution chamber 43 is provided within a circumferentially defined range of the extension 413. The central circumferential portion of the internal void 414 is formed as a narrow portion 4141 with a radial width smaller than the radial width of the other portions of the internal void 414, while the other portions of the internal void 414, i.e., the circumferentially side portions, are formed as wide portions 4142 with a larger radial width. The sub-burner inlet pipe 45 is configured such that its downstream end communicates with the narrow portion 4141 of the internal void 414 and extends radially outward along a line passing through the circumferential center of the narrow portion 4141. Furthermore, the mixed gas flows from the narrow portion 4141 to the wide portion 4142 of the internal void 414 via the sub-burner inlet pipe 45, thereby achieving the effect of drawing primary air from the opening 451 at the upstream end of the sub-burner inlet pipe 45 (the same effect as the so-called radial Venturi effect).

[0032] Therefore, even if the length of the sub-burner inlet pipe 45 is relatively short, it can still draw in sufficient primary air. Thus, even without increasing the outer diameter of the main burner body 51, the front end of the sub-burner nozzle 46 can be positioned radially inward from above than the outer periphery of the main burner body 51, and the maximum firepower of the sub-burner 4 can be set to a larger value without causing insufficient primary air.

[0033] Furthermore, in this embodiment, the outer cylinder 411 and inner cylinder 412 of the sub-burner body 41 extend downwards beyond the sub-burner distribution chamber 43 to form an extension 413. Moreover, the inner peripheral sidewall 414a and outer peripheral sidewall 414b of the internal void 414 are formed by the inner cylinder 412 and outer cylinder 411 as separate components. Therefore, unlike the case where the internal void 414 is formed as a single component through demolding, the radial width of the narrow portion 4141 of the internal void 414 can be sufficiently reduced, and the aforementioned primary air suction effect can be reliably obtained.

[0034] Furthermore, a sealing portion 412a is formed in the extension portion 413 of the inner cylinder 412 of the sub-burner body 41. This sealing portion 412a is located outside the internal gap 414 and contacts the inner circumferential surface of the extension portion 413 of the outer cylinder 411 of the sub-burner body 41. Additionally, the portions of the inner circumferential sidewall 414a and outer circumferential sidewall 414b of the internal gap 414 that correspond to the narrow portion 4141 form planes orthogonal to a line passing through the circumferential center of the narrow portion 4141 of the internal gap 414. Furthermore, an opening 452 for the downstream end of the sub-burner inlet pipe 45 is provided in the portion of the outer circumferential sidewall 414b of the internal gap 414 that corresponds to the narrow portion 4141. Moreover, the internal flow path 453 connecting the upstream opening 451 and the downstream opening 452 of the sub-burner inlet pipe 45 narrows towards the downstream side.

[0035] However, if the mixed gas flows off the narrow portion 4141 of the internal void 414 towards the sub-burner distribution chamber 43 directly above it, the flame increases in the circumferential portion of the sub-burner cover 42 corresponding to the narrow portion 4141, and the circumferential flame distribution of the sub-burner 4 becomes uneven. Therefore, in this embodiment, a resistance-imposing part 415 is provided to increase the ventilation resistance of the portion where the upper end of the narrow portion 4141 of the internal void 414 communicates with the sub-burner distribution chamber 43. Accordingly, the mixed gas will not flow off the narrow portion 4141 of the internal void 414 towards the sub-burner distribution chamber 43 directly above it, and the circumferential flame distribution of the sub-burner 4 can be prevented from becoming uneven. Furthermore, in this embodiment, the resistance-imposing part 415 is formed by a protrusion that protrudes in the shape of an eave at the upper end of the portion corresponding to the narrow portion 4141 on the inner peripheral sidewall 414a of the internal gap 414. However, the resistance-imposing part 415 may also be formed by a protrusion that protrudes at the upper end of the portion corresponding to the narrow portion 4141 on the outer peripheral sidewall 414b of the internal gap 414.

[0036] Furthermore, if the sub-burner nozzle 46 is positioned on the top plate 2 of the gas stove as described above, cooking liquid may accumulate in the nozzle hole 46a at the front end of the sub-burner nozzle 46, causing blockage of the nozzle hole 46a. Therefore, the front end of the sub-burner nozzle 46 is positioned directly below the main burner body 51, and the downwardly extending skirt-shaped portion 514 extends towards the outer periphery of the bottom wall portion 511 of the main burner body 51. This prevents cooking liquid from directly accumulating in the nozzle hole 46a of the sub-burner nozzle 46. Furthermore, the skirt-shaped portion 514 prevents cooking liquid from flowing back from the outer periphery of the main burner body 51 to the lower surface of the bottom wall portion 511. Therefore, it also prevents cooking liquid from accumulating along the bottom wall portion 511 of the main burner body 51 in the nozzle hole 46a of the sub-burner nozzle 46.

[0037] However, during combustion in the sub-burner 4, a strong airflow (airflow) is generated between the top plate 2 and the main burner 5 of the gas stove, drawn towards the sub-burner 4 by the rising airflow generated by combustion. Therefore, if the lower end of the skirt-shaped portion 514 is higher than the nozzle orifice 46a of the sub-burner nozzle 46, the droplets of cooking liquid dripping from the lower end of the skirt-shaped portion 514 may be trapped in the nozzle orifice 46a of the sub-burner nozzle 46 along with the airflow generated between the top plate 2 and the main burner 5. Therefore, it is preferable that the lower end of the skirt-shaped portion 514 is at the same height as or below the nozzle orifice 46a of the sub-burner nozzle 46. This effectively prevents the droplets of cooking liquid dripping from the lower end of the skirt-shaped portion 514 from being trapped in the nozzle orifice 46a of the sub-burner nozzle 46 along with the airflow generated between the top plate 2 and the main burner 5. Furthermore, in this embodiment, the height of the lower end of the skirt-shaped portion 514 is set to be equal to the nozzle hole 46a of the sub-burner nozzle 46.

[0038] Furthermore, when viewed from above the top plate 2 of the gas stove, a raised portion 221 is provided on the portion of the cover plate 22 located further radially inward than the skirt-shaped portion 514, that is, on the portion of the cover plate 22 located further radially inward than the skirt-shaped portion 514. This raised portion is more upward than the portion of the cover plate 22 located radially outward relative to this portion. Moreover, as Figure 3As clearly shown, the tip of the sub-burner nozzle 46 is positioned radially inward than the outline of the raised portion 221 when viewed from above. This prevents cooking slurry dripping from the skirt-shaped portion 514 from flowing onto the cover plate 22 and accumulating near the tip of the sub-burner nozzle 46 in the nozzle orifice 46a. Furthermore, in this embodiment, a protrusion 221a extending radially outward than the skirt-shaped portion 514 is provided in the circumferential portion of the raised portion 221 corresponding to the sub-burner nozzle 46. However, the protrusion 221a is configured such that the nozzle support 461 protrudes upward, thus preventing cooking slurry dripping from the skirt-shaped portion 514 onto the protrusion 221a from flowing to the vicinity of the tip of the sub-burner nozzle 46 because the nozzle support 461 acts as an obstruction.

[0039] Furthermore, in this embodiment, on the inner circumference of the circumferential portion of the bottom wall 511 of the mother burner body 51 that corresponds to the daughter burner nozzle 46, an eave 515 extending radially inward extends to a position that covers at least the upstream end of the daughter burner inlet pipe 45 from above. Figure 4 As clearly shown, downwardly extending hanging wall portions 515a, 515a are provided on both circumferential sides of the eaves 515. Accordingly, even if cooking liquid drips between the main burner body 51 and the sub-burner body 41, it can be prevented from remaining in the nozzle hole 46a of the sub-burner nozzle 46. Furthermore, in this embodiment, the eaves 515 is designed to protrude from above, substantially completely covering the portion of the sub-burner inflow pipe 45 that protrudes from the extension 413 of the sub-burner body 41.

[0040] Also refer to Figure 5 A base plate portion 416 is integrally formed on the outer cylinder 411 of the sub-burner body 41. This base plate portion 416 extends outward from the lower part of the portion that forms the extension portion 413, corresponding to the circumferential portion of the sub-burner inlet pipe 45, and the opposite portion thereof, and is integrated with the bottom wall portion of the sub-burner inlet pipe 45. Furthermore, by fixing the nozzle support 461 for mounting the sub-burner nozzle 46 and the end of the base plate portion 416 on the nozzle support 461 side to a common mounting platform 11, the concentricity of the sub-burner nozzle 46 and the sub-burner inlet pipe 45 can be ensured. In addition, a short cylindrical portion 416a is provided on the portion of the base plate portion 416 that extends outward from the opposite portion of the circumferential portion corresponding to the sub-burner inlet pipe 45, into which the downstream side pipe 551 of the mother burner inlet pipe 55 is inserted.

[0041] The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited thereto. For example, in the above embodiments, the sub-burner inlet pipe 45 is integrally formed with the outer cylinder 411 of the sub-burner body 41, but the sub-burner inlet pipe 45, which is separate from the outer cylinder 411, can also be connected to the outer cylinder 411. In addition, in the above embodiments, the top plate 2 of the gas stove is composed of a top plate body 21 and a cover plate 22, but the top plate body 21 and the cover plate 22 can also be integrated.

[0042] Explanation of reference numerals in the attached figures

[0043] A… Mother burner, 2… Top plate, 221… Raised portion, 4… Sub-burner, 41… Sub-burner body, 413… Extension, 414… Internal gap, 4141… Narrow section, 4142… Wide section (other parts of the internal gap), 415… Resistance-imposing section, 42… Sub-burner cover, 43… Sub-burner distribution chamber, 44… Sub-burner flame hole, 45… Sub-burner inlet pipe, 451… Opening at the upstream end, 46… Sub-burner nozzle, 46a… Nozzle hole, 5… Mother burner, 51… Mother burner body, 511… Bottom wall, 514… Skirt, 515… Eaves, 515a… Drooping wall, 52… Mother burner cover, 53… Mother burner distribution chamber, 54… Mother burner flame hole, 55… Mother burner inlet pipe.

Claims

1. A mother-daughter burner, installed in a gas stove, comprising a daughter burner and a mother burner surrounding the daughter burner. The sub-burner comprises: a sub-burner body exposed on the top plate of the gas stove; a sub-burner cover mounted on the sub-burner body to delineate a sub-burner distribution chamber between itself and the sub-burner body, and having multiple sub-burner flame holes for ejecting mixed gas from the sub-burner distribution chamber; and a sub-burner inlet pipe extending horizontally from the sub-burner body on the top plate of the gas stove. The sub-burner distribution chamber is supplied with a mixture of combustible gas ejected from the nozzle orifice at the front end of the sub-burner nozzle, which is positioned facing the opening at the upstream end of the sub-burner inlet pipe, and primary air drawn in from the opening at the upstream end of the sub-burner inlet pipe. The mother burner comprises: an annular mother burner body exposed on the top plate of the gas stove and surrounding the daughter burner body; an annular mother burner cover mounted on the mother burner body to delineate a mother burner distribution chamber between the cover and the mother burner body, and having multiple mother burner flame holes for ejecting mixed gas from the mother burner distribution chamber; and a mother burner inlet pipe extending from the mother burner body downwards from the top plate of the gas stove. The mother burner distribution chamber is supplied with a mixture of combustible gas ejected from the nozzle orifice at the front end of the mother burner nozzle, which is located facing the opening at the upstream end of the mother burner inlet pipe, and primary air drawn in from the opening at the upstream end of the mother burner inlet pipe. The sub-burner nozzle is located at a position lower than the main body of the main burner, and radially inward from the outer periphery of the main body when viewed from above. Its characteristic is that... The sub-burner body has an extension that extends downwards beyond the sub-burner distribution chamber. An internal gap communicating with the sub-burner distribution chamber is provided within a specified circumferential range of the extension section. The circumferential central portion of the internal void is formed as a narrow section with a radial width smaller than the radial width of the other portions of the internal void. The sub-burner inlet pipe is configured such that its downstream end communicates with a narrow section of the internal void, and extends radially outward along a line passing through the circumferential center of this narrow section. The mixed gas flows from a narrow section of the internal cavity to the other parts of the internal cavity through the sub-burner inlet pipe, thereby achieving the effect of drawing primary air from the opening at the upstream end of the sub-burner inlet pipe.

2. The mother-daughter burner according to claim 1, characterized in that, The master burner is provided with a resistance-increasing section, which is used to increase the airflow resistance of the upper end of the narrow portion of the internal void that communicates with the distribution chamber of the master burner.

3. The mother-daughter burner according to claim 1, characterized in that, The inner and outer peripheral sidewalls of the internal cavity are formed by different components.

4. The mother-daughter burner according to claim 1, characterized in that, On the inner circumference of the circumferential portion of the bottom wall of the main burner body that corresponds to the nozzle of the sub-burner, an eave extending radially inward extends to a position that covers at least the upstream end of the sub-burner inlet pipe from above. The eaves are provided with downward-extending hanging wall sections on both sides.

5. The mother-daughter burner according to claim 1, characterized in that, The front end of the sub-burner nozzle is located directly below the main body of the mother burner. The skirt-like portion extending downwards protrudes towards the outer periphery of the bottom wall of the main burner body. The lower end of the skirt-shaped part is at the same height as or lower than the nozzle orifice of the sub-burner nozzle.

6. A gas stove, characterized in that, The gas stove has a master burner as described in any one of claims 1 to 4.

7. A gas stove, characterized in that, The gas stove includes the mother-daughter burner as described in claim 5, wherein, when viewed from above the top plate of the gas stove, a portion located radially inward than the skirt-shaped portion is provided with a raised portion that bulges upward compared to a portion of the top plate located radially outward. The front end of the sub-burner nozzle is located at a position that, when viewed from above, is further radially inward than the outline of the raised portion.

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