Stove burners and cooking appliances equipped with stove burners

Abstract

To inhibit interference between flames of first flame holes at the lower side and second flame holes at the upper side which are open on an outer peripheral surface of a flame hole formation member which can be divided vertically to stabilize combustion.SOLUTION: In a first formation member 21 at the lower side of a flame hole formation member 20, multiple first radial grooves 21e are provided in a recessed form and arranged in a circumferential direction at an upper end of a first annular wall 21d erected upward from an outer edge portion and each first protruding part 21s protruding upward is formed between the adjacent first grooves. On the other hand, in a second formation member 22 at the upper side, multiple second radial grooves 22b are provided in a recessed form and arranged in the circumferential direction at a lower end of a second annular wall 22a hanging downward from the outer edge portion, and each second protruding part 22s protruding downward is formed between the adjacent second grooves. The first formation member and the second formation member are placed offset from each other in the circumferential direction so that the first grooves and the second grooves do not overlap with each other to form each first flame hole 20Ua by the first groove and a lower end of the second protruding part and form each second flame hole 20Ub by the second groove and an upper end of the first protruding part. At that time, the upper end of the first protruding part is located above the lower end of the second protruding part.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a stove burner in which a lower first flame port and an upper second flame port are opened alternately in the circumferential direction on the outer peripheral surface of a flame port forming member that can be separated into upper and lower parts, and to a heating cooker equipped with the stove burner. [Background technology]

[0002] Stovetop burners, which have multiple flame ports opening on the outer peripheral surface of a flame port-forming member and which eject a mixture of fuel gas and air from the flame ports to cause combustion, are widely used in cooking appliances such as gas stoves. For such stovetop burners, it has been proposed to configure the flame port-forming member so that it can be separated into upper and lower parts in order to improve the workability of the flame port-forming member (for example, Patent Document 1).

[0003] The first forming member below the burner port-forming member has a first annular wall extending upward from its outer edge, with a plurality of radial first grooves recessed at a predetermined interval in the circumferential direction at the upper end of the first annular wall, forming a first convex portion that is upwardly convex between adjacent first grooves. Meanwhile, the second forming member above the burner port-forming member has a second annular wall extending downward from its outer edge, with a plurality of radial second grooves recessed at a predetermined interval in the circumferential direction at the lower end of the second annular wall, forming a second convex portion that is downwardly convex. By placing the second forming member on the first forming member while shifting them circumferentially so that the first grooves and the second grooves do not overlap, the first burner port formed by the first grooves and the lower end of the second convex portion opens on the outer peripheral surface of the first annular wall, and the second burner port formed by the second grooves and the upper end of the first convex portion opens on the outer peripheral surface of the second annular wall. Therefore, the first and second flame ports are arranged alternately in the circumferential direction on the outer circumferential surface of the flame port forming member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2019-143959 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in conventional stove burners in which the flame port forming member is configured to be divisible into upper and lower parts as described above, when the upper second forming member is placed on the lower first forming member, the first flame port opening on the outer peripheral surface of the first annular wall and the second flame port opening on the outer peripheral surface of the second annular wall are close to each other in the vertical direction, which creates the problem that the flames of the two can interfere with each other, making combustion unstable.

[0006] This invention has been made in response to the above-mentioned problems in conventional technology, and aims to provide a technology that can stabilize combustion by suppressing interference between the flames of the first and second flame ports in a stove burner in which a lower first flame port and an upper second flame port are opened alternately in the circumferential direction on the outer peripheral surface of a flame port forming member that can be divided into upper and lower parts. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the stove burner of the present invention employs the following configuration: A stove burner has a plurality of flame ports opening on the outer peripheral surface of a flame port forming member that can be separated into upper and lower parts, and a mixed gas of fuel gas and air is ejected from the flame ports to burn. The first forming member below the flame port forming member has a first annular wall that stands annularly upward from an outer edge portion, and a plurality of radial first grooves are recessed at an upper end of the first annular wall at predetermined intervals in the circumferential direction, and the space between adjacent first grooves forms a first convex portion that is convex upward, The second forming member above the flame port forming member has a second annular wall extending downward from an outer edge portion thereof in an annular shape, and a plurality of second grooves extending radially are recessed at a predetermined interval in the circumferential direction at the lower end of the second annular wall, and the space between adjacent second grooves forms a second convex portion that is convex downward, By placing the second forming member on the first forming member while shifting it in the circumferential direction so that the first groove of the first annular wall and the second groove of the second annular wall do not overlap, the first flame port formed by the first groove and the lower end of the second convex portion opens on the outer peripheral surface of the first annular wall, and the second flame port formed by the second groove and the upper end of the first convex portion opens on the outer peripheral surface of the second annular wall, When the second forming member is placed on the first forming member, the upper end of the first convex portion is located higher than the lower end of the second convex portion. It is characterized by:

[0008] In the stove burner of the present invention, the upper end of the first convex portion and the lower end of the second convex portion overlap in the vertical direction, thereby ensuring a vertical gap (distance) between the upper end of the first flame port and the lower end of the second flame port. Therefore, compared to when the upper end of the first convex portion and the lower end of the second convex portion are aligned (located on the same plane), it is possible to suppress interference between the flames of the first flame port and the second flame port, thereby stabilizing combustion.

[0009] The stove burner of the present invention described above may be configured as follows: First, the outer peripheral surface of the burner-port-forming member is divided into a burner-port region where first and second burner ports are alternately opened in the circumferential direction, and a non-burner-port region where neither the first nor second burner ports are open for more than a predetermined distance. At least one of the following conditions is satisfied: a first condition that the upper end of the first convex portion in the burner-port region is located above the upper end of the first annular wall in the non-burner-port region; and a second condition that the lower end of the second convex portion in the burner-port region is located below the lower end of the second annular wall in the non-burner-port region.

[0010] In this way, in the non-flame port area, the upper end of the first annular wall and the lower end of the second annular wall are abutted, while in the flame port area, the upper end of the first convex portion is inserted into the second groove or the lower end of the second convex portion is inserted into the first groove, thereby causing a vertical overlap between the upper end side of the first convex portion and the lower end side of the second convex portion, thereby making it possible to ensure a vertical gap between the upper end of the first flame port and the lower end of the second flame port.

[0011] The stove burner of the present invention described above may also be configured as follows. First, the width of the first convex portion in the circumferential direction of the flame port-forming member is wider than the width of the second groove, and the width of the second convex portion is wider than the width of the first groove. Also, first chamfered portions are provided between both circumferential side surfaces and the upper end surface of the first convex portion, and second chamfered portions are provided between both circumferential side surfaces and the lower end surface of the second convex portion. Then, when the second forming member is placed on the first forming member, the first chamfered portions of the first convex portion and the second chamfered portions of the second convex portion abut against each other.

[0012] In this way, the upper end side of the first convex portion and the lower end side of the second convex portion overlap in the vertical direction, while the first flame nozzle and the second flame nozzle can be reliably separated by the point where the first chamfered portion and the second chamfered portion abut, thereby making it possible to prevent the flames from the first flame nozzle and the second flame nozzle from connecting and ensuring stable combustion.

[0013] In addition, in the stove burner of the present invention described above, the first chamfered portion and the second chamfered portion may be curved surfaces with a continuous arc having a center of curvature along the radial direction of the first annular wall and the second annular wall.

[0014] By performing so-called R-chamfering on the first and second chamfered portions, the abutment points between the first and second chamfered portions are in line contact. Therefore, for example, even if boiling water from a cooking vessel placed above the stove burner spills onto the flame port-forming member, sticking of the boiling water to the first forming member and the second forming member due to burning can be suppressed compared to when there is surface contact.

[0015] In such a stove burner of the present invention, either the first forming member or the second forming member may be provided with a blocking wall that covers the joint between the first annular wall and the second annular wall in the non-flame port area from the radially inner side.

[0016] In this way, even if a gap occurs at the joint between the first annular wall and the second annular wall in the non-flame port area due to the first chamfered portion of the first convex portion and the second chamfered portion of the second convex portion abutting against each other first in the flame port area, the inside of the gap is covered by the blocking wall, so the outflow of mixed gas from the gap can be suppressed.

[0017] The stove burner of the present invention may be configured as follows: First, a third annular wall extending annularly downward from the outer edge of the first forming member has a plurality of third grooves recessed in the circumferential direction at the lower end thereof. The burner body has an annular mounting surface on which the third annular wall of the first forming member is mounted. By mounting the first forming member on the burner body, a third flame port formed by the third grooves and the mounting surface opens on the outer peripheral surface of the third annular wall. The burner can be switched between a state in which the mixed gas is supplied to the third flame port but not to the first and second flame ports, and a state in which the mixed gas is supplied to the first and second flame ports in addition to the third flame port.

[0018] In this way, even in a type of stove burner (so-called parent-child burner) that has a third flame nozzle to which mixed gas is supplied independently of the first and second flame nozzles, by applying the present invention, it is possible to suppress interference between the flames of the first flame nozzle and the second flame nozzle, thereby stabilizing combustion.

[0019] Furthermore, the stove burner of the present invention may be mounted on a cooking appliance to heat a cooking vessel placed above the stove burner.

[0020] In this type of cooking appliance, the flames of the first and second flame ports, which are opened on the outer surface of the flame port-forming member of the stove burner, are prevented from interfering with each other, stabilizing combustion. As a result, the cooking appliance can ensure stable cooking performance. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view showing the appearance of a gas stove 1 as an example of a cooking appliance equipped with a stove burner 10 of the present embodiment. [Figure 2] 1 is a perspective view showing the general shape of a stove burner 10 according to the present embodiment. [Figure 3] FIG. 2 is a perspective view showing the upper part of the stove burner 10 of this embodiment in an exploded state. [Figure 4] FIG. 2 is a vertical cross-sectional view showing the internal structure of the stove burner 10 of this embodiment. [Figure 5] 1 is an explanatory diagram showing an enlarged view of the outer peripheral surface of a burner cap 20 in a conventional stove burner 10. FIG. [Figure 6] This is an explanatory diagram showing an enlarged view of the outer surface of the burner cap 20 in the stove burner 10 of this embodiment. [Figure 7] 2 is an enlarged vertical cross-sectional view showing the internal structure of the non-flame port region of the burner cap 20 of this embodiment. FIG. [Figure 8] FIG. 10 is an explanatory diagram showing an example in which one of the first chamfered portion 21t and the second chamfered portion 22t is R-chamfered and the other is C-chamfered. [Figure 9] FIG. 10 is an explanatory diagram showing an example in which the width of the first convex portion 21s is narrower than the width of the second groove 22b, and the width of the second convex portion 22s is narrower than the width of the first groove 21e. DETAILED DESCRIPTION OF THE INVENTION

[0022] 1 is a perspective view showing the appearance of a gas stove 1 as an example of a cooking appliance equipped with a stove burner 10 of this embodiment. The illustrated gas stove 1 comprises a stove body 2 in the shape of a shallow box with an open top, and a top plate 3 that is placed on the stove body 2 and covers the top surface of the stove body 2. Two stove burners 10 that burn fuel gas are installed on the left and right of the stove body 2, and the tops of the stove burners 10 protrude from insertion holes formed in the top plate 3.

[0023] A trivet 4 for placing a pot or other cooking vessel on top of the stove burner 10 is installed on the top plate 3. As shown in the figure, the trivet 4 has multiple (six in this embodiment) prongs 4b radially supported by an annular frame 4a mounted on the top plate 3 and surrounding the stove burner 10, and cooking vessels are placed on the top surfaces of these prongs 4b. Also, on the front side of the top plate 3, there are operating knobs 5 corresponding to each of the two stove burners 10, which the user operates to ignite, extinguish, or adjust the flame intensity. When the operating knob 5 is pressed down and rotated in a predetermined direction (counterclockwise in this embodiment) from its initial position, fuel gas is supplied to the stove burner 10 and ignited by a spark plug, which will be described later. Thereafter, by changing the rotation angle of the operation knob 5, the amount of fuel gas supplied is changed, thereby adjusting the flame power of the stove burner 10, and by returning the operation knob 5 to its initial position, the supply of fuel gas to the stove burner 10 is stopped, resulting in extinguishing the flame.

[0024] 2 is a perspective view showing the general shape of the stove burner 10 of this embodiment. As shown in the figure, the stove burner 10 has a structure in which a substantially cylindrical burner cap 20 is placed on a substantially cylindrical burner body 11. Two mixing tubes, one large and one small (large mixing tube 12 and small mixing tube 13), are connected to the burner body 11, and the burner body 11 and the two mixing tubes 12 and 13 of this embodiment are formed by sheet metal processing using thin plates such as stainless steel. As will be described later, a mixture of fuel gas and primary air is supplied to the burner body 11 through the mixing tubes 12 and 13.

[0025] On the other hand, the burner cap 20 of this embodiment is formed by die-casting using aluminum alloy, brass, or the like. As shown enlarged in Fig. 2, a plurality of flame ports 20U, 20L are opened on the outer peripheral surface of the burner cap 20 placed on the burner body 11, arranged in two upper and lower rows. Of these, the upper-level flame ports 20U are further divided into upper and lower sections, with lower first upper-level flame ports 20Ua and upper second upper-level flame ports 20Ub arranged alternately in the circumferential direction of the outer peripheral surface of the burner cap 20. The burner cap 20 of this embodiment corresponds to the "flame port-forming member" of the present invention.

[0026] A gas pipe 40 that leads fuel gas to the stove burner 10 is provided with a main valve 41 that opens and closes the gas pipe 40. The gas pipe 40 branches into two downstream of the main valve 41, and branch pipes 40a and 40b are each provided with flow control valves 42a and 42b that adjust the flow rate of the fuel gas. The main valve 41 is electrically connected to a control unit (not shown), and its opening and closing is controlled by the control unit. Meanwhile, the flow control valves 42a and 42b are connected to an operation knob 5 on the top plate 3 via a shaft (not shown), and the flow rate of the fuel gas can be changed by rotating the operation knob 5.

[0027] When fuel gas is injected from a nozzle (not shown) connected to the end of branch pipe 40a toward the open end 12o of the large mixing tube 12, it flows into the large mixing tube 12 while sucking in primary air, and the fuel gas and primary air passing through the large mixing tube 12 are mixed and the mixed gas is supplied to the burner body 11. Similarly, when fuel gas is injected from a nozzle (not shown) connected to the end of branch pipe 40b toward the open end 13o of the small mixing tube 13, the fuel gas and primary air are mixed while passing through the small mixing tube 13 and the mixed gas is supplied to the burner body 11.

[0028] As will be described in detail later, the stove burner 10 of this embodiment is a so-called parent-child burner. The upper flame nozzles 20U (first upper flame nozzle 20Ua and second upper flame nozzle 20Ub) are supplied with mixed gas from a large mixing tube 12, while the lower flame nozzles 20L are supplied with mixed gas from a small mixing tube 13. As shown in the figure, an ignition plug 30 is installed near the outer circumferential surface of the burner body 11, and a hood 31 extending from the outer circumferential surface of the burner cap 20 covers the ignition plug 30 from above. Spark discharge from the ignition plug 30 toward the burner cap 20 initiates combustion of the mixed gas ejected from the lower flame nozzle 20L. A flame sensor 32 consisting of a thermocouple is installed adjacent to the ignition plug 30, enabling it to detect the flame at the lower flame nozzle 20L. The flame sensor 32 is electrically connected to the aforementioned control unit.

[0029] In the present embodiment, the stove burner 10 can be switched between a state in which the mixed gas is supplied to the lower nozzle 20L but not to the upper nozzle 20U, and a state in which the mixed gas is supplied to both the lower nozzle 20L and the upper nozzle 20U using the aforementioned flow control valves 42a and 42b. The lower nozzle 20L has a smaller opening area than the upper nozzle 20U, resulting in a smaller amount of mixed gas being ejected. Therefore, if the required heat power of the stove burner 10 is low, the mixed gas can be burned only through the lower nozzle 20L. If the required heat power increases, the mixed gas can be burned through both the lower nozzle 20L and the upper nozzle 20U. In this case, the flame from the lower nozzle 20L spreads, and the mixed gas ejected from the upper nozzle 20U begins to burn. As shown in the figure, the upper flame port 20U does not open at a position on the outer surface of the burner cap 20 that faces the multiple claw portions 4b of the trivet 4 mentioned above, thereby preventing the claw portions 4b from being burned by the flame from the upper flame port 20U.

[0030] 3 is a perspective view showing the disassembled upper part of the stove burner 10 of this embodiment. As shown in the figure, the substantially cylindrical burner body 11 has an upper end bent inward and is provided with an annular mounting surface 11a on which the burner cap 20 is placed. The upper part of this burner body 11 protrudes from the insertion hole in the top plate 3 when the stove burner 10 is installed on the stove main body 2. Furthermore, a substantially cylindrical central cylinder 14 is erected inside the burner body 11, and an annular mixing chamber 16 to which mixed gas is supplied is formed between the burner body 11 and the central cylinder 14.

[0031] Furthermore, a substantially cylindrical partition cylinder 15 is provided between the burner body 11 and the central cylinder 14. This divides the mixing chamber 16 into an inner mixing chamber 16a located inside the partition cylinder 15 (i.e., between the partition cylinder 15 and the central cylinder 14), and an outer mixing chamber 16b located outside the partition cylinder 15 (i.e., between the burner body 11 and the partition cylinder 15). Of these, the inner mixing chamber 16a is supplied with the mixed gas that has passed through the large mixing tube 12, and the outer mixing chamber 16b is supplied with the mixed gas that has passed through the small mixing tube 13. The partition cylinder 15 is formed by sheet metal processing in the same way as the burner body 11, and has an upper end bent inward and an inner side bent downward, and is provided with a short cylindrical fitting surface 15a.

[0032] The burner cap 20 of this embodiment is configured to be separable into two, upper and lower, pieces for improved workability. The lower first cap member 21 is placed on the burner body 11, and the upper second cap member 22 is placed on the first cap member 21. As shown in the figure, a cylindrical partition wall tube 21a extends downward from the inner edge of the annular first cap member 21. A shallow, annular lower annular wall 21b extends downward from the outer edge of the first cap member 21. The lower end of this lower annular wall 21b has multiple radial lower grooves 21c arranged circumferentially. When placing the first cap member 21 on the burner body 11, the partition wall tube 21a is fitted inside the fitting surface 15a of the partition cylinder 15, and the lower end of the lower annular wall 21b of the first cap member 21 abuts against the mounting surface 11a of the burner body 11. The first cap member 21 of this embodiment corresponds to the "first forming member" of the present invention, and the second cap member 22 of this embodiment corresponds to the "second forming member" of the present invention. The lower annular wall 21b of this embodiment corresponds to the "third annular wall" of the present invention, and the lower groove 21c of this embodiment corresponds to the "third groove" of the present invention.

[0033] The first cap member 21 has a first annular wall 21d that extends upward from the outer edge, and a plurality of first radial grooves 21e are recessed at predetermined intervals in the circumferential direction at the upper end of the first annular wall 21d. Note that the first grooves 21e are not provided in positions of the first annular wall 21d that face the plurality of claws 4b of the trivet 4.

[0034] On the other hand, the circular second cap member 22 has a second annular wall 22a extending downward from its outer edge in an annular shape. The lower end of the second annular wall 22a has multiple radial second grooves 22b recessed at predetermined intervals in the circumferential direction. The aforementioned eaves portion 31, which covers the upper portion of the ignition plug 30, extends from the outer peripheral surface of the second annular wall 22a. Like the first groove 21e, the second groove 22b is not provided in a position on the second annular wall 22a that faces the multiple claws 4b of the trivet 4. In the burner cap 20 of this embodiment, when the second cap member 22 is placed on the first cap member 21, the upper end of the first annular wall 21d and the lower end of the second annular wall 22a are aligned with each other while the first groove 21e and the second groove 22b are offset circumferentially so as not to overlap.

[0035] FIG. 4 is a vertical cross-sectional view showing the internal structure of the stove burner 10 of this embodiment. As mentioned above, a mixing chamber 16 is provided between the burner body 11 and the central cylinder 14, and is divided into an inner mixing chamber 16a and an outer mixing chamber 16b by a partition cylinder 15. When the first cap member 21 is placed on the burner body 11, the partition cylinder 21a is fitted inside the fitting surface 15a of the partition cylinder 15, and the lower end of the lower annular wall 21b of the first cap member 21 abuts against the mounting surface 11a. The lower flame port 20L formed by the lower groove 21c and the mounting surface 11a opens to the outer peripheral surface of the lower annular wall 21b. In FIG. 4, the left cross-section of the first cap member 21 represents a cross-section cut at the position of the lower groove 21c (lower flame port 20L), and the right cross-section represents a cross-section cut at a position where the lower groove 21c is not present. The lower flame port 20L in this embodiment corresponds to the "third flame port" of the present invention.

[0036] The lower flame port 20L is connected to the outer mixing chamber 16b, and the mixed gas supplied through the small mixing tube 13 is ejected from the lower flame port 20L, and combustion of the mixed gas is initiated by spark discharge from the ignition plug 30. The flame sensor 32 of this embodiment is positioned so as to be able to detect the flame from the lower flame port 20L.

[0037] 4, a cylindrical fitting tube 22d hangs down from the underside of second cap member 22, and when second cap member 22 is placed on first cap member 21, fitting tube 22d is fitted into the inside of the upper part of central cylinder 14. The lower end side of central cylinder 14 is airtightly joined to the periphery of through-hole 17h formed in bottom plate 17 made of sheet metal.

[0038] Furthermore, the second cap member 22 is placed circumferentially offset with respect to the first cap member 21 so that the first groove 21e of the first annular wall 21d and the second groove 22b of the second annular wall 22a do not overlap, and a first upper-stage flame port 20Ua formed by the first groove 21e and the lower end of the second annular wall 22a opens onto the outer circumferential surface of the first annular wall 21d, and a second upper-stage flame port 20Ub formed by the second groove 22b and the upper end of the first annular wall 21d opens onto the outer circumferential surface of the second annular wall 22a. In Fig. 4, the right-hand cross-section of the first cap member 21 and the second cap member 22 represents a cross-section cut at the position of the first groove 21e (first upper-stage flame port 20Ua), and the left-hand cross-section represents a cross-section cut at the position of the second groove 22b (second upper-stage flame port 20Ub). The first upper flame port 20Ua of this embodiment corresponds to the "first flame port" of the present invention, and the second upper flame port 20Ub of this embodiment corresponds to the "second flame port" of the present invention.

[0039] The first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub are connected to the internal mixing chamber 16a, and the mixed gas supplied through the large mixing tube 12 is ejected from the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub, and combustion of the mixed gas begins as a result of flame transfer from the flame in the lower-stage flame port 20L. As described above, the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub are arranged alternately in the circumferential direction on the outer circumferential surface of the burner cap 20.

[0040] In a stove burner 10 in which the upper flame nozzle 20U is divided into upper and lower portions, combustion can become unstable due to interference between the flame from the lower first upper flame nozzle 20Ua and the upper second upper flame nozzle 20Ub. Therefore, in the stove burner 10 of this embodiment, a vertical gap is provided between the upper end of the first upper flame nozzle 20Ua and the lower end of the second upper flame nozzle 20Ub to suppress flame interference and stabilize combustion. This point will be explained below. For comparison, a conventional stove burner 10 in which combustion can become unstable due to interference between the flames from the first upper flame nozzle 20Ua and the second upper flame nozzle 20Ub will first be described.

[0041] FIG. 5 is an explanatory diagram showing an enlarged view of the outer peripheral surface of the burner cap 20 in a conventional stove burner 10. In the figure, the outer peripheral surfaces of the first annular wall 21d of the first cap member 21 and the second annular wall 22a of the second cap member 22 are hatched. As shown in the figure, the space between adjacent first grooves 21e of the first annular wall 21d is an upwardly convex first protrusion 21s, and the space between adjacent second grooves 22b of the second annular wall 22a is a downwardly convex second protrusion 22s. Furthermore, the width of the first protrusion 21s in the circumferential direction of the burner cap 20 (the left-right direction in the figure) is wider than the width of the second groove 22b, and the width of the second protrusion 22s is wider than the width of the first groove 21e, providing a circumferential overlap between the first protrusion 21s and the second protrusion 22s.

[0042] The first groove 21e and the lower end of the second protrusion 22s form a first upper-tier flame port 20Ua, and the second groove 22b and the upper end of the first protrusion 21s form a second upper-tier flame port 20Ub. Note that the first upper-tier flame port 20Ua and the second upper-tier flame port 20Ub do not open at positions on the outer circumferential surface of the burner cap 20 that face the plurality of claws 4b of the trivet 4. In the following, the region where neither the first upper-tier flame port 20Ua nor the second upper-tier flame port 20Ub opens over a predetermined interval or more will be referred to as the "non-flame port region," and the region where the first upper-tier flame port 20Ua and the second upper-tier flame port 20Ub open alternately in the circumferential direction will be referred to as the "flame port region."

[0043] In the conventional stove burner 10, the height of the upper end of the first convex portion 21s in the flame port region is the same as the height of the upper end of the first annular wall 21d in the non-flame port region, and the height of the lower end of the second convex portion 22s in the flame port region is the same as the height of the lower end of the second annular wall 22a in the non-flame port region, and when the second cap member 22 is placed on the first cap member 21, the upper end of the first convex portion 21s and the upper end of the second convex portion 22s are located on the same plane. For this reason, the upper end of the first upper-stage flame nozzle 20Ua (the lower end of the second convex portion 22s) and the lower end of the second upper-stage flame nozzle 20Ub (the upper end of the first convex portion 21s) are close to each other in the vertical direction, and in particular, when it becomes difficult to ensure a circumferential distance between the first upper-stage flame nozzle 20Ua and the second upper-stage flame nozzle 20Ub due to a reduction in the diameter of the burner cap 20 and an increase in the number of first upper-stage flame nozzles 20Ua and second upper-stage flame nozzles 20Ub, the flames of the first upper-stage flame nozzle 20Ua and the second upper-stage flame nozzle 20Ub are likely to interfere with each other, making combustion unstable.

[0044] On the other hand, Figure 6 is an explanatory diagram showing an enlarged view of the outer peripheral surface of the burner cap 20 in the stove burner 10 of this embodiment. Figure 6(a) shows the state in which the second cap member 22 is placed on the first cap member 21, and Figure 6(b) shows the state in which the second cap member 22 is separated from the first cap member 21. Also, as in Figure 5, the outer peripheral surfaces of the first annular wall 21d and the second annular wall 22a are shown hatched.

[0045] As shown in the figure, in the stove burner 10 of this embodiment, the upper end of the first convex portion 21s in the flame port region is located higher than the upper end of the first annular wall 21d in the non-flame port region, and the lower end of the second convex portion 22s in the flame port region is located lower than the lower end of the second annular wall 22a in the non-flame port region.

[0046] In addition, the width of the first convex portion 21s in the circumferential direction of the burner cap 20 (left-right direction in the figure) is wider than the width of the second groove 22b, and first chamfered portions 21t are provided between both circumferential side surfaces of the first convex portion 21s and the upper end face. Similarly, the width of the second convex portion 22s in the circumferential direction of the burner cap 20 is wider than the width of the first groove 21e, and second chamfered portions 22t are provided between both circumferential side surfaces of the second convex portion 22s and the lower end face. The first chamfered portions 21t and the second chamfered portions 22t in this embodiment form curved surfaces (so-called R-chamfered surfaces) in which arcs having a center of curvature are continuous along the radial direction of the burner cap 20 (front-rear direction in the figure).

[0047] 6(a), when the second cap member 22 is placed on the first cap member 21, the upper end of the first annular wall 21d and the lower end of the second annular wall 22a abut against each other in the non-flame port region, and the first chamfered portion 21t of the first protrusion 21s and the second chamfered portion 22t of the second protrusion 22s abut against each other in the flame port region. As a result, the upper end of the first protrusion 21s fits into the second groove 22b, and the lower end of the second protrusion 22s fits into the first groove 21e, so that the upper end of the first protrusion 21s is positioned higher than the lower end of the second protrusion 22s.

[0048] In the stove burner 10 of this embodiment, the upper end of the first convex portion 21s and the lower end of the second convex portion 22s overlap in the vertical direction in the flame port region, thereby ensuring a vertical gap G between the upper end of the first upper-stage flame port 20Ua and the lower end of the second upper-stage flame port 20Ub. Therefore, compared to the conventional example described above, where the upper ends of the first convex portion 21s and the second convex portion 22s are located on the same plane, it is possible to suppress interference between the flames of the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub and stabilize combustion.

[0049] In particular, in the stove burner 10 of this embodiment, the upper end of the first convex portion 21s in the flame port region is located higher than the upper end of the first annular wall 21d in the non-flame port region, and the lower end of the second convex portion 22s in the flame port region is located lower than the lower end of the second annular wall 22a in the non-flame port region. As a result, in the non-flame port region, the upper end of the first annular wall 21d and the lower end of the second annular wall 22a abut against each other, while in the flame port region, the upper end of the first convex portion 21s can fit into the second groove 22b and the lower end of the second convex portion 22s can fit into the first groove 21e, so that a vertical gap G can be secured between the upper end of the first upper-stage flame port 20Ua and the lower end of the second upper-stage flame port 20Ub.

[0050] Furthermore, in the stove burner 10 of this embodiment, the width of the first convex portion 21s in the circumferential direction of the burner cap 20 is wider than the width of the second groove 22b, and the width of the second convex portion 22s is wider than the width of the first groove 21e, but the first convex portion 21s is provided with a first chamfered portion 21t, and the second convex portion 22s is provided with a second chamfered portion 22t. In this way, while the first chamfered portion 21t and the second chamfered portion 22t are in contact with each other, the upper end of the first convex portion 21s can be inserted into the second groove 22b, and the lower end of the second convex portion 22s can be inserted into the first groove 21e. In this way, the first upper flame nozzle 20Ua and the second upper flame nozzle 20Ub are reliably separated by the contact point between the first chamfered portion 21t and the second chamfered portion 22t, thereby making it possible to prevent the flames from the first upper flame nozzle 20Ua and the second upper flame nozzle 20Ub from connecting, thereby ensuring stable combustion.

[0051] In the stove burner 10 of this embodiment, the first chamfered portion 21t and the second chamfered portion 22t are subjected to so-called R-chamfering, so that the abutment points between the first chamfered portion 21t and the second chamfered portion 22t are in line contact. Therefore, for example, even if the boiled-over liquid spills from a cooking vessel placed above the stove burner 10 and splashes onto the burner cap 20, the sticking of the boiled-over liquid between the first cap member 21 and the second cap member 22 can be suppressed compared to the case of surface contact.

[0052] 7 is an enlarged vertical cross-sectional view showing the internal structure of the non-flame port region of the burner cap 20 of this embodiment. As shown in the figure, a blocking wall 21g is erected upward radially inward of the first annular wall 21d in the non-flame port region of the first cap member 21. When the second cap member 22 is placed on the first cap member 21, the blocking wall 21g covers the joint between the first annular wall 21d and the second annular wall 22a in the non-flame port region from the radially inner side.

[0053] In the stove burner 10 of this embodiment, even if a gap occurs at the joint between the first annular wall 21d and the second annular wall 22a in the non-flame port area because the first chamfered portion 21t of the first convex portion 21s and the second chamfered portion 22t of the second convex portion 22s come into contact first in the flame port area, the inside of the gap is covered by the blocking wall 21g, so the outflow of mixed gas from the gap can be suppressed.

[0054] The above describes the stove burner 10 of this embodiment, but the present invention is not limited to the above embodiment and can be implemented in various forms within the scope of its gist.

[0055] For example, in the above-described embodiment, the first chamfered portion 21t of the first protrusion 21s and the second chamfered portion 22t of the second protrusion 22s are both R-chamfered. However, the first chamfered portion 21t and the second chamfered portion 22t are not limited to R-chamfered, and either one may be so-called C-chamfered. FIG. 8 is an explanatory diagram showing an example in which one of the first chamfered portion 21t of the first protrusion 21s and the second chamfered portion 22t of the second protrusion 22s is R-chamfered and the other is C-chamfered. In the figure, the outer peripheral surface of the burner cap 20 is shown enlarged, and the outer peripheral surfaces of the first annular wall 21d and the second annular wall 22a are indicated by hatching. Also, Figure 8(a) shows the state in which the second cap member 22 is placed on the first cap member 21, and Figure 8(b) shows the state in which the second cap member 22 is separated from the first cap member 21.

[0056] In the illustrated example, the first chamfered portion 21t of the first protrusion 21s is R-chamfered as in the previously described embodiment, whereas the second chamfered portion 22t of the second protrusion 22s is C-chamfered to form a flat surface inclined at a 45-degree angle with respect to the lower end surface of the second protrusion 22s. When the second cap member 22 is placed on the first cap member 21, the curved surface of the R-chamfered first chamfered portion 21t abuts against the flat surface of the C-chamfered second chamfered portion 22t in the flame port region, as shown in FIG. 8(a). Of course, the opposite may also be true, with the second chamfered portion 22t being R-chamfered and the first chamfered portion 21t being C-chamfered.

[0057] In such a stove burner 10, as in the above-described embodiment, the upper end of the first convex portion 21s is inserted into the second groove 22b and the lower end of the second convex portion 22s is inserted into the first groove 21e, thereby ensuring a vertical gap G between the upper end of the first upper-stage flame nozzle 20Ua and the lower end of the second upper-stage flame nozzle 20Ub, and the first upper-stage flame nozzle 20Ua and the second upper-stage flame nozzle 20Ub can be separated by the contact point between the first chamfered portion 21t and the second chamfered portion 22t.

[0058] Both the first chamfered portion 21t of the first protrusion 21s and the second chamfered portion 22t of the second protrusion 22s may be C-chamfered. In this case, the abutment points between the first chamfered portion 21t and the second chamfered portion 22t are in surface contact. On the other hand, if at least one of the first chamfered portion 21t and the second chamfered portion 22t is R-chamfered, the abutment points between the first chamfered portion 21t and the second chamfered portion 22t are in line contact, which makes it possible to prevent the first cap member 21 and the second cap member 22 from sticking due to boil-over liquid or the like, compared to surface contact.

[0059] Furthermore, in the above-described embodiment, the width of the first convex portion 21s in the circumferential direction of the burner cap 20 was wider than the width of the second groove 22b, and the width of the second convex portion 22s was wider than the width of the first groove 21e. However, this is not limited to this, and as shown in Fig. 9, the width of the first convex portion 21s in the circumferential direction of the burner cap 20 may be narrower than the width of the second groove 22b, and the width of the second convex portion 22s may be narrower than the width of the first groove 21e. Fig. 9 shows an enlarged view of the outer peripheral surface of the burner cap 20, and the outer peripheral surfaces of the first annular wall 21d and the second annular wall 22a are indicated by hatching.

[0060] In the illustrated example, the upper end of the first convex portion 21s in the flame port region is located higher than the upper end of the first annular wall 21d in the non-flame port region, and the width of the first convex portion 21s in the circumferential direction of the burner cap 20 (left-right direction in the figure) is slightly narrower than the width of the second groove 22b. Furthermore, the lower end of the second convex portion 22s in the flame port region is located lower than the lower end of the second annular wall 22a in the non-flame port region, and the width of the second convex portion 22s in the circumferential direction of the burner cap 20 is slightly narrower than the width of the first groove 21e. When the second cap member 22 is placed on the first cap member 21, the upper end of the first annular wall 21d and the lower end of the second annular wall 22a abut against each other in the non-flame port area, and in the flame port area, the upper end of the first convex portion 21s enters the second groove 22b and the lower end of the second convex portion 22s enters the first groove 21e, so that the upper end of the first convex portion 21s is positioned higher than the lower end of the second convex portion 22s.

[0061] In this type of stove burner 10, even without the first chamfered portion 21t of the first protrusion 21s or the second chamfered portion 22t of the second protrusion 22s, the upper end of the first protrusion 21s and the lower end of the second protrusion 22s overlap in the vertical direction in the flame port region, thereby ensuring a vertical gap G between the upper end of the first upper-stage flame port 20Ua and the lower end of the second upper-stage flame port 20Ub. However, since the second protrusion 22s is not placed on the first protrusion 21s and a gap is likely to occur in the circumferential direction (the left-right direction in the figure) between the first protrusion 21s and the second protrusion 22s, it is necessary to strictly control the width of the first groove 21e, the width tolerance of the first protrusion 21s, and the width of the second groove 22b and the width tolerance of the second protrusion 22s. In contrast to this, if the first chamfered portion 21t and the second chamfered portion 22t are made to abut against each other as in the above-described embodiment, the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub can be separated by the point of abutment.

[0062] In the above-described embodiment, both the first condition, that the upper end of the first convex portion 21s in the flame port region is located above the upper end of the first annular wall 21d in the non-flame port region, and the second condition, that the lower end of the second convex portion 22s in the flame port region is located below the lower end of the second annular wall 22a in the non-flame port region, are satisfied. However, it is also possible to satisfy only one of the first and second conditions. For example, if only the first condition is satisfied, the upper end of the first convex portion 21s can be inserted into the second groove 22b in the flame port region while the upper end of the first annular wall 21d abuts the lower end of the second annular wall 22a in the non-flame port region, thereby ensuring the vertical gap G between the upper end of the first upper-stage flame port 20Ua and the lower end of the second upper-stage flame port 20Ub. Furthermore, if both the first and second conditions are satisfied as in the above-described embodiment, a larger gap G can be ensured than if only one of the first and second conditions is satisfied.

[0063] In the above-described embodiment, the blocking wall 21g that covers the joint between the first annular wall 21d and the second annular wall 22a from the radially inner side in the non-flame port region of the burner cap 20 is erected from the first cap member 21. However, the provision of the blocking wall 21g is not limited to the first cap member 21, and the blocking wall 21g may be erected downward from the radially inner side of the second annular wall 22a in the non-flame port region of the second cap member 22.

[0064] In the above-described embodiment, the stove burner 10 (so-called parent-child burner) is described as an example in which the mixed gas is supplied to the upper flame nozzle 20U (first upper flame nozzle 20Ua and second upper flame nozzle 20Ub) through the large mixing tube 12, and to the lower flame nozzle 20L through the small mixing tube 13. However, the application of the present invention is not limited to parent-child burners, and may also be a type that does not have the small mixing tube 13 or the lower flame nozzle 20L (so-called single burner).

[0065] Furthermore, in the above-described embodiment, the stove burner 10 is described as a type that does not have a temperature sensor that detects the temperature of a cooking vessel placed above the stove burner 10. However, the present invention can also be applied to a stove burner 10 that has a temperature sensor. In this case, the insertion hole is provided inside the fitting cylinder 22d of the second cap member 22 (see FIG. 4), and the upper part of the temperature sensor that is erected inside the central cylinder 14 is made to protrude from the insertion hole, so that the upper end of the temperature sensor, which is biased upward by a biasing spring, comes into contact with the underside of the cooking vessel, thereby detecting the temperature of the cooking vessel. [Explanation of symbols]

[0066] 1...Gas stove, 2...Stove body, 3...Top plate, 4...trivet, 4a...frame, 4b...claw, 5...Operation knob, 10...Stove burner, 11...Burner body, 11a... placement surface, 12... large mixing tube, 13... small mixing tube, 14...Central cylinder, 15...Partition cylinder, 15a...Mating surface, 16...Mixing chamber, 16a...Inner mixing chamber, 16b...Outer mixing chamber, 17...Bottom plate, 17h...Through hole, 20...Burner cap, 20L...Lower flame nozzle, 20U...Upper flame nozzle, 20Ua...1st upper flame nozzle, 20Ub... second upper flame port, 21... first cap member, 21a... partition tube, 21b...lower annular wall, 21c...lower groove, 21d...first annular wall, 21e...first groove, 21g...blocking wall, 21s...first protrusion, 21t...first chamfered portion, 22...second cap member, 22a...second annular wall, 22b...second groove, 22d...fitting cylinder, 22s...second protrusion, 22t...second chamfered portion, 30...spark plug, 31...eaves portion, 32...flame sensor, 40...gas piping, 40a...branch piping, 40b...branch piping, 41...main valve, 42a...flow control valve, 42b...Flow control valve.

Claims

1. A stove burner has a plurality of flame ports opening on the outer peripheral surface of a flame port forming member that can be separated into upper and lower parts, and a mixed gas of fuel gas and air is ejected from the flame ports to burn. The first forming member below the flame port forming member has a first annular wall that stands annularly upward from an outer edge portion, and a plurality of first grooves in the radial direction are recessed at an upper end of the first annular wall at predetermined intervals in the circumferential direction, and the space between adjacent first grooves forms a first convex portion that is convex upward, The second forming member above the flame port forming member has a second annular wall extending downward from an outer edge portion thereof in an annular shape, and a plurality of second grooves extending radially are recessed at a predetermined interval in the circumferential direction at the lower end of the second annular wall, and the spaces between adjacent second grooves form second convex portions that are convex downward, By placing the second forming member on the first forming member while shifting it in the circumferential direction so that the first groove of the first annular wall and the second groove of the second annular wall do not overlap, the plurality of flame ports are such that a first flame port formed by the first groove and the lower end of the second convex portion opens onto the outer peripheral surface of the first annular wall, and a second flame port formed by the second groove and the upper end of the first convex portion opens onto the outer peripheral surface of the second annular wall, In a state where the second forming member is placed on the first forming member, the upper end of the first convex portion is located higher than the lower end of the second convex portion. an outer peripheral surface of the burner port forming member is divided into a burner port region in which the first burner ports and the second burner ports are alternately opened in the circumferential direction, and a non-burner port region in which neither the first burner ports nor the second burner ports are opened over a predetermined interval or more; At least one of a first condition that the upper end of the first convex portion in the flame port region is located higher than the upper end of the first annular wall in the non-flame port region and a second condition that the lower end of the second convex portion in the flame port region is located lower than the lower end of the second annular wall in the non-flame port region is satisfied. A stove burner characterized by:

2. The stove burner according to claim 1, a width of the first convex portion in the circumferential direction of the flame port forming member is wider than a width of the second groove, and a width of the second convex portion is wider than a width of the first groove, a first chamfered portion is provided between both circumferential side surfaces of the first protrusion and an upper end surface of the first protrusion, a second chamfered portion is provided between both circumferential side surfaces of the second protrusion and a lower end surface of the second protrusion, When the second forming member is placed on the first forming member, the first chamfered portion of the first convex portion and the second chamfered portion of the second convex portion are in contact with each other. A stove burner characterized by:

3. The stove burner according to claim 2, The first chamfered portion and the second chamfered portion are curved surfaces formed by a series of arcs having a center of curvature along the radial direction of the first annular wall and the second annular wall. A stove burner characterized by:

4. In the stove burner according to claim 2 or claim 3, One of the first forming member and the second forming member is provided with a blocking wall that covers the joint between the first annular wall and the second annular wall in the non-flame port region from the inside in the radial direction. A stove burner characterized by:

5. The stove burner according to any one of claims 1 to 4, the first forming member has a third annular wall extending downward from an outer edge portion thereof in an annular shape, and a plurality of third grooves extending radially in the circumferential direction are recessed in a lower end of the third annular wall, a burner body having an annular mounting surface on which the third annular wall of the first forming member is mounted, By placing the first forming member on the burner body, a third flame port formed by the third groove and the mounting surface opens onto the outer circumferential surface of the third annular wall, The gas supply system is switchable between a state in which the mixed gas is supplied to the third flame port but not to the first flame port and the second flame port, and a state in which the mixed gas is supplied to the first flame port and the second flame port in addition to the third flame port. A stove burner characterized by:

6. A stove burner in which a plurality of flame ports are opened on the outer peripheral surface of a flame port forming member which can be separated into upper and lower parts, and a mixture of fuel gas and air is ejected from the flame ports to cause combustion, The first forming member below the flame port forming member has a first annular wall that stands annularly upward from an outer edge portion, and a plurality of first grooves in the radial direction are recessed at an upper end of the first annular wall at predetermined intervals in the circumferential direction, and the space between adjacent first grooves forms a first convex portion that is convex upward, The second forming member above the flame port forming member has a second annular wall extending downward from an outer edge portion thereof in an annular shape, and a plurality of second grooves extending radially are recessed at a predetermined interval in the circumferential direction at the lower end of the second annular wall, and the spaces between adjacent second grooves form second convex portions that are convex downward, By placing the second forming member on the first forming member while shifting it in the circumferential direction so that the first groove of the first annular wall and the second groove of the second annular wall do not overlap, the plurality of flame ports are such that a first flame port formed by the first groove and the lower end of the second convex portion opens onto the outer peripheral surface of the first annular wall, and a second flame port formed by the second groove and the upper end of the first convex portion opens onto the outer peripheral surface of the second annular wall, In a state where the second forming member is placed on the first forming member, the upper end of the first convex portion is located higher than the lower end of the second convex portion. the first forming member has a third annular wall extending downward from an outer edge portion thereof in an annular shape, and a plurality of third grooves extending radially in the circumferential direction are recessed in a lower end of the third annular wall, a burner body having an annular mounting surface on which the third annular wall of the first forming member is mounted, By placing the first forming member on the burner body, a third flame port formed by the third groove and the mounting surface opens onto the outer circumferential surface of the third annular wall, The gas supply system is switchable between a state in which the mixed gas is supplied to the third flame port but not to the first flame port and the second flame port, and a state in which the mixed gas is supplied to the first flame port and the second flame port in addition to the third flame port. A stove burner characterized by:

7. A cooking appliance comprising the stove burner according to any one of claims 1 to 6, and configured to heat a cooking vessel placed above the stove burner.

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