Burner for cooking appliance

Abstract

The present invention provides a burner for a cooking appliance. The burner for the cooking appliance can prevent boiling overflow from flowing into the inside of the flame holes and prevent the flame holes from being blocked by the boiling overflow. The burner (B) for the cooking appliance includes a burner body (2) and an annular burner head (3) placed on the burner body (2). The burner head (3) has a plurality of grooves (30a) that are spaced apart in the circumferential direction and extend in the radial direction. The burner body (2) has an annular placement portion (21), and when the burner head (3) is placed on the burner body (2), a flame hole (P) is formed together with the grooves (30a). The flame hole (P) has a first surface (21a) at the bottom that gradually slopes upward toward the outside in the radial direction and a second surface (21b) located on the outer peripheral side of the first surface (21a) and gradually sloping downward toward the outside in the radial direction.

Description

Technical Field

[0001] The present invention relates to a burner for a cooking appliance that forms a flame along the outer periphery of a burner head. Background Art

[0002] Conventionally, there has been known a burner for a cooking appliance that includes a burner body and an annular burner head. Among them, the burner body is connected and provided at the downstream end of a mixing tube that generates a mixed gas of fuel gas and primary air; the above-described burner head is placed on the burner body and forms a flame along the outer periphery. Such a burner for a cooking appliance forms a plurality of flame holes along the outer periphery of the burner head by placing the burner head on the burner body (for example, refer to Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2000-46308 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In the burner for a cooking appliance described in Patent Document 1, there is a case where boiling overflow from a cooking container adheres to the flame holes. In such a case, depending on the formation position, size, and shape of the flame holes, there is a possibility that the boiling overflow penetrates into the flame holes and flows into the inside of the burner. In addition, even if there is no inflow problem, there may be a case where the boiling overflow blocks the flame holes.

[0008] The present invention has been made in view of the above problems, and an object thereof is to provide a burner for a cooking appliance that can prevent the boiling overflow from flowing into the inside and causing the boiling overflow to block the flame holes.

[0009] Means for Solving the Problems

[0010] The burner for a cooking appliance of the present invention includes a burner body and an annular burner head, the burner body being connected and provided at the downstream end of a mixing tube that generates a mixed gas of fuel gas and primary air; the burner head being placed on the burner body and forming a flame along the outer periphery,

[0011] wherein one of the burner body and the burner head has a plurality of grooves that are spaced apart in the circumferential direction and extend in the radial direction,

[0012] the other of the burner body and the burner head includes an annular contact portion that contacts the surface of the one of the burner body and the burner head on which the grooves are formed,

[0013] the burner for a cooking appliance is characterized in that

[0014] When the burner head is placed on the burner body, the plurality of slots and the abutting portion form a plurality of flame holes.

[0015] The flame holes have a first surface at the bottom and a second surface located on the outer peripheral side of the first surface.

[0016] The first surface gradually slopes upward toward the radially outer side.

[0017] The second surface gradually slopes downward toward the radially outer side.

[0018] With this configuration, in the burner for a stove of the present invention, when the burner head is placed on the burner body, one of the burner head and the burner body abuts against the other, and thus the abutting portion and the slots provided on the burner head and the burner body form flame holes.

[0019] Moreover, the flame holes have a first surface that slopes upward toward the radially outer side at the bottom (i.e., the bottom of the slots or the abutting portion) and a second surface located on the outer peripheral side of the first surface and sloping downward toward the radially outer side. That is, the lower surface of the formed flame holes slopes upward toward the radially outer side on the inner peripheral side and slopes downward toward the radially outer side on the outer peripheral side.

[0020] Here, since the flame is formed on the outer periphery of the burner head, the mixed gas generated by the mixing tube is supplied from the inner peripheral side of the flame holes. Therefore, the mixed gas is rectified by the lower surface of the inner peripheral portion of the flame holes (i.e., the first surface that slopes upward toward the radially outer side) to flow upward in its inner peripheral portion.

[0021] And the mixed gas rectified in this way is guided to the upper surface of the outer peripheral portion of the flame holes (i.e., the bottom surface of the slots of the burner head) and ejected from the upper portion of the opening of the flame holes to form a flame. At this time, compared with the case where it is not rectified in this way, the mixed gas ejects from the flame holes with good momentum. As a result, the momentum of the mixed gas can be used to prevent the boiling overflow from invading the flame holes.

[0022] In addition, in the case where the boiling overflow is not blown away by the mixed gas and invades the flame holes, of course, the boiling overflow will invade from the outer peripheral side of the flame holes. However, the invading boiling overflow will also be guided to the direction of being discharged from the flame holes along the inclination of the lower surface of the outer peripheral portion of the flame holes (i.e., the second surface that gradually slopes downward toward the radially outer side).

[0023] Therefore, in the burner for a cooking appliance of the present invention, it is possible to prevent the boiling overflows from invading the flame holes, and even if the boiling overflows invade the flame holes, the boiling overflows will be guided to the direction of being discharged from the flame holes. Therefore, it is possible to prevent the boiling overflows from invading the interior and the situation where the flame holes are blocked by the boiling overflows.

[0024] In addition, in the burner for a cooking appliance of the present invention, preferably, the width in the circumferential direction of the groove gradually increases from the outer periphery toward the radial center portion.

[0025] In the burner for a cooking appliance of the present invention, the first surface at the bottom of the flame hole gradually slopes upward toward the radial outside, and the second surface gradually slopes downward toward the radial outside. Therefore, when the width in the circumferential direction of the groove that forms the flame hole together with the abutting portion (for example, Figure 5 the width in the depth direction of the paper surface in ) is constant, the cross-sectional area of the flame hole becomes smaller from the radial outside toward the radial center portion.

[0026] Moreover, usually the boiling overflows invade the flame holes from the radial outside thereof. Therefore, when the boiling overflows invade the flame holes, the invading boiling overflows may be guided toward the radial center portion where the cross-sectional area of the flame hole becomes narrower due to capillary action.

[0027] Therefore, if the width in the circumferential direction of the groove is configured to increase from the outer periphery toward the radial center portion as described above, the change in the cross-sectional area of the flame hole in the radial direction can be suppressed. Thereby, it is possible to suppress the boiling overflows that invade the flame holes from flowing toward the inner peripheral side of the flame holes due to capillary action. As a result, it is possible to further prevent the boiling overflows from flowing into the interior of the flame holes and the situation where the flame holes are blocked by the boiling overflows.

[0028] In addition, in the burner for a cooking appliance of the present invention, preferably, the groove is provided in the burner head, the abutting portion is provided in the burner body, the burner body has a cylindrical peripheral wall portion extending downward from the outer peripheral end of the abutting portion, and the outer diameter of the peripheral wall portion is smaller than or equal to the outer diameter of the burner head.

[0029] With the above configuration, in the case where the boiling overflows invade the flame holes, the boiling overflows guided by the lower surface (i.e., the second surface) of the outer peripheral portion of the flame holes are guided to the peripheral surface of the peripheral wall portion via the outer peripheral end of the abutting portion and are smoothly discharged to the outside of the flame holes. Thereby, it is possible to further prevent the boiling overflows from flowing into the interior of the flame holes and the situation where the flame holes are blocked by the boiling overflows.

[0030] It should be noted that when the outer diameter of the peripheral wall portion is substantially the same as the outer diameter of the burner head, an appearance with a sense of unity is formed, so that an improvement in aesthetics can be achieved. In addition, when the outer diameter of the burner head is larger than the outer diameter of the peripheral wall portion, a portion that does not abut against the abutting portion of the burner main body can be formed at the outer peripheral edge portion of the burner head. Thereby, the boiling overflow that intrudes from this portion can fall before intruding into the radial inner side of the flame holes, so that the boiling overflow can be discharged more smoothly from the flame holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a perspective view showing a burner for a cooking appliance according to an embodiment.

[0032] Figure 2 is Figure 1 a side view of the burner for a cooking appliance.

[0033] Figure 3 is Figure 1 a cross-sectional view taken along line III-III of the burner for a cooking appliance.

[0034] Figure 4 is an enlarged view showing Figure 1 a part of the burner head of the burner for a cooking appliance as a bottom view.

[0035] Figure 5 is Figure 3 an enlarged view of the main part of the burner for a cooking appliance.

[0036] SYMBOL DESCRIPTION

[0037] 1... mixing tube, 2... burner main body, 3... burner head, 10... upper member, 11... lower member, 20... base portion, 20a... outer cylinder portion (peripheral wall portion), 20b... inner cylinder portion, 20c... distribution chamber, 21... mounting portion (abutting portion, bottom of flame hole), 21a... first surface, 21b... second surface, 22... positioning cylinder portion, 30... annular portion, 30a... groove, 31... cylindrical portion, B... burner for a cooking appliance, P... flame hole, a... central axis. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] Hereinafter, the burner B for a cooking appliance according to the present embodiment will be described with reference to the drawings. The burner B for a cooking appliance is mounted on a tabletop cooking appliance, an embedded cooking appliance, or the like.

[0039] First, with reference to Figures 1 to 4 , the schematic structure of the burner B for a cooking appliance will be described.

[0040] As Figure 1 and Figure 2As shown, the burner B for a cooking appliance includes a mixing tube 1, a burner body 2 connected to the downstream end of the mixing tube 1, and an annular burner head 3 placed on the burner body 2. The mixing tube 1 and the burner body 2 are made of metal plates, and in the burner B for a cooking appliance, the mixing tube 1 and the burner body 2 are formed integrally. In addition, the burner head 3 is made by die casting.

[0041] The mixing tube 1 guides the fuel gas ejected from a gas nozzle (not shown) together with primary air, and generates a mixed gas of the fuel gas and the primary air inside the mixing tube 1. The mixing tube 1 is formed by hermetically connecting an upper member 10 and a lower member 11 to each other by riveting or the like at the outer peripheral edge portions thereof, where the upper member 10 forms the upper half of the mixing tube 1; the lower member 11 forms the lower half of the mixing tube 1.

[0042] As Figure 3 shown, the burner body 2 includes a base portion 20 connected to the mixing tube 1. The base portion 20 has an outer cylinder portion 20a (peripheral wall portion) connected to the upper member 10 of the mixing tube 1 and an inner cylinder portion 20b connected to the lower member 11 of the mixing tube 1. It should be noted that, in the present embodiment, the burner body 2 is made of a metal plate, but it may also be made of a casting or by die casting.

[0043] The outer cylinder portion 20a and the inner cylinder portion 20b are connected to each other while connecting the upper member 10 and the lower member 11. Thus, a hollow distribution chamber 20c connected to the downstream of the mixing tube 1 is formed between the outer cylinder portion 20a and the inner cylinder portion 20b.

[0044] In addition, the burner body 2 has an annular placement portion 21 (abutting portion, bottom of the flame hole P) extending radially inward from the upper end edge of the outer cylinder portion 20a. A later-described annular portion 30 of the burner head 3 is placed on the placement portion 21.

[0045] In addition, the upper end edge of the inner cylinder portion 20b extends radially inward. A cylindrical positioning cylinder portion 22 extends downward from the upper end edge of the inner cylinder portion 20b. A later-described cylindrical portion 31 of the burner head 3 is fitted on the positioning cylinder portion 22. Thus, the burner head 3 is positioned with respect to the burner body 2.

[0046] The burner head 3 has an annular annular portion 30 and a cylindrical portion 31 extending downward from the inner peripheral edge of the annular portion 30. The annular portion 30 is placed on the placement portion 21 of the burner body 2. The cylindrical portion 31 is inserted into the positioning cylinder portion 22 of the burner body 2 and fitted with the positioning cylinder portion 22. It should be noted that, in the present embodiment, the burner head 3 is made by die casting, but it may also be made of a metal plate or by casting.

[0047] As Figure 4As shown, on the lower surface of the annular portion 30, a plurality of grooves 30a extending radially to the outer periphery of the annular portion 30 are formed at intervals in the circumferential direction. As Figure 3 shown, the annular portion 30 is placed on the burner main body 2 in such a manner that its lower surface abuts against the placement portion 21 of the burner main body 2.

[0048] When the burner head 3 is placed on the burner main body 2, a plurality of flame holes P arranged in the circumferential direction are formed by the grooves 30a and the placement portion 21 (refer to Figure 5 )(refer to Figure 1 and Figure 2 ). Thus, when using the stove burner, a plurality of flames are formed on the outer periphery of the burner head 3.

[0049] Next, with reference to Figure 4 and Figure 5 , the placement portion 21 and the annular portion 30 forming the flame holes P will be described in detail.

[0050] As Figure 5 shown, the placement portion 21 of the burner main body 2 has an annular first surface 21a at the position where it abuts against the lower surface of the annular portion 30 of the burner head 3, and an annular second surface 21b located at a position on the outer peripheral side of the first surface 21a. The second surface 21b is connected to the first surface 21a on its radial inner side and is connected to the outer peripheral end of the outer cylinder portion 20a of the base portion 20 on its radial outer side.

[0051] In the cross-section including the central axis a (refer to Figure 3 ) of the outer cylinder portion 20a where the placement portion 21 is connected, the first surface 21a linearly slopes gradually upward toward the radial outer side. On the other hand, the second surface 21b curves and gradually slopes downward toward the radial outer side.

[0052] The lower surface of the annular portion 30 of the burner head 3 abuts against the burner main body 2 in a manner that straddles the first surface 21a and the second surface 21b of the burner main body 2. Therefore, the shape of the lower surface of the annular portion 30 becomes a shape corresponding to the first surface 21a and the second surface 21b.

[0053] Specifically, in the cross-section including the central axis of the annular portion 30 (which is the axis coinciding with the central axis a of the outer cylinder portion 20a (refer to Figure 3 ) in this embodiment), the lower surface of the annular portion 30 linearly slopes gradually upward toward the radial outer side in a manner corresponding to the inclination of the first surface 21a on the radial inner side. On the other hand, the lower surface of the annular portion 30 curves and gradually slopes downward toward the radial outer side in a manner corresponding to the inclination of the second surface 21b on the radial outer side.

[0054] The bottom of the groove 30a formed on the lower surface of the annular portion 30 of the burner head 3 (i.e., the bottom of the flame hole P (refer to Figure 5 ), which will be described later) linearly inclines gradually upward from the radially inner side toward the radially outer side in the radial direction.

[0055] In the stove burner B, when the burner head 3 is placed on the burner body 2, the flame hole P is formed by the first surface 21a and the second surface 21b of the placement portion 21 of the burner body 2 and the groove 30a formed on the lower surface of the annular portion 30 of the burner head 3.

[0056] The upper surface of the flame hole P formed in this way linearly inclines gradually upward toward the radially outer side in a cross-section including the central axis a of the outer cylinder portion 20a or the central axis of the annular portion 30. On the other hand, the lower surface of the flame hole P inclines upward toward the radially outer side on the inner peripheral side, and the lower surface of the flame hole P inclines downward toward the radially outer side on the outer peripheral side.

[0057] Here, since the flame is formed on the outer periphery of the burner head 3, the mixed gas generated at the mixing tube 1 is supplied from the inner peripheral side of the flame hole P (refer to the Figure 5 shown arrow). Therefore, the mixed gas is rectified by the lower surface of the inner peripheral portion of the flame hole P (i.e., the first surface 21a that inclines upward toward the radially outer side) to flow upward at its inner peripheral portion.

[0058] And, the mixed gas rectified in this way is guided to the upper surface of the outer peripheral portion of the flame hole P (i.e., the bottom surface of the groove 30a of the burner head 3) and ejected from the upper portion of the opening of the flame hole P to form a flame. At this time, compared with the case where such rectification is not performed, the mixed gas ejects from the flame hole P with good momentum. As a result, by the momentum of the mixed gas, it is possible to prevent the boiling overflow from invading the flame hole P.

[0059] In addition, when the boiling overflow is not blown away by the mixed gas and invades the flame hole P, of course, the boiling overflow will invade from the outer peripheral side of the flame hole P. However, the invading boiling overflow is guided along the inclination of the lower surface of the outer peripheral portion of the flame hole P (i.e., the second surface 21b that gradually inclines downward toward the radially outer side) to the direction of being discharged from the flame hole P.

[0060] Therefore, the stove burner B can prevent the boiling overflow from invading the flame hole P, and even if the boiling overflow invades the flame hole P, the boiling overflow will be guided to the direction of being discharged from the flame hole P. Therefore, it is possible to prevent the boiling overflow from invading the inside and the situation where the boiling overflow blocks the flame hole P.

[0061] In addition, in the burner B for a cooking appliance, the first surface 21a that forms the flame hole P together with the groove 30a of the burner head 3 gradually slopes upward toward the radially outer side, and the second surface 21b gradually slopes downward toward the radially outer side.

[0062] Here, the burner head 3 is made by die-casting. Therefore, in order to facilitate demolding during manufacturing, the groove 30a of the burner head 3 is formed such that its circumferential width ( Figure 5 the width in the depth direction of the paper surface in ) becomes wider as it gets closer to the lower side in the vertical direction. On the other hand, in the radial direction ( Figure 5 the left-right direction of the paper surface in ), its circumferential width is constant.

[0063] Therefore, the cross-sectional area of the flame hole P formed by the first surface 21a, the second surface 21b, and the groove 30a becomes smaller from the radially outer side toward the radially central part.

[0064] Moreover, usually, boiling overflows invade the flame hole P from its radially outer side. Therefore, when boiling overflows invade the flame hole P, the invading boiling overflows may be guided toward the radially central part where the cross-sectional area of the flame hole narrows due to capillary action.

[0065] Therefore, as Figure 4 shown, in the burner B for a cooking appliance, the circumferential width of the groove 30a is configured to gradually increase from the outer periphery toward the radially central part.

[0066] If configured in this way, the change in the cross-sectional area of the flame hole P in the radial direction can be suppressed. As a result, it is possible to suppress the boiling overflows that invade the flame hole P from flowing toward the inner peripheral side of the flame hole P due to capillary action. Consequently, it is possible to further prevent the boiling overflows from invading the interior and the situation where the boiling overflows cause blockage of the flame hole P.

[0067] In addition, as Figure 5 shown, in the burner B for a cooking appliance, the outer cylinder part 20a (circumferential wall part) of the base part 20 extends downward from the outer peripheral end of the second surface 21b of the mounting part 21. In addition, as <s Figure 3 shown, the outer diameter of the outer cylinder part 20a is the same as the outer diameter of the burner head 3 (specifically, the outer diameter of the annular part 30).

[0068] This is so that when boiling overflows invade the flame hole P, the boiling overflows guided by the lower surface of the outer peripheral part of the flame hole P (i.e., the second surface 21b of the mounting part 21) are introduced into the peripheral surface of the outer cylinder part 20a via the outer peripheral end of the mounting part 21 and discharged smoothly to the outside of the flame hole P. In addition, this gives a sense of unity to the appearance and can also improve the aesthetics.

[0069] It should be noted that even when the outer diameter of the burner head 3 is larger than the outer diameter of the outer cylinder portion 20a, the boiling overflow that intrudes into the flame holes P will be guided to the circumferential surface of the outer cylinder portion 20a via the outer peripheral end of the mounting portion 21, and will be smoothly discharged to the outside of the flame holes P, just the same as the case where the outer diameter of the outer cylinder portion 20a and the outer diameter of the burner head 3 are the same.

[0070] Moreover, in the case of being configured in this way, a portion that does not come into contact with the mounting portion 21 of the burner main body 2 can be formed at the outer peripheral edge portion of the annular portion 30 of the burner head 3. Thereby, the boiling overflow that intrudes from this portion can fall before intruding radially inward of the flame holes P, and can be discharged from the flame holes P more smoothly.

[0071] As described above, the illustrated embodiments have been described, but the present invention is not limited to such a manner.

[0072] For example, in the above-described embodiment, as Figure 5 shown, a groove 30a is provided in the burner head 3, and a mounting portion 21 serving as an abutting portion is provided on the burner main body 2, and the flame holes P are formed by the groove 30a and the mounting portion 21. However, the burner for a stove of the present invention is not limited to such a structure, and an abutting portion may be provided on the burner head, and a groove may be provided on the burner main body, and the flame holes may be formed by the abutting portion and the groove. In this case, a first surface and a second surface are formed at the bottom of the groove.

[0073] In addition, for example, in the above-described embodiment, as Figure 5 shown, the first surface 21a and the second surface 21b of the mounting portion 21 of the burner main body 2 are connected to each other.

[0074] However, the first surface and the second surface of the present invention are not limited to such a structure. For example, although not shown, a third annular surface extending horizontally may be formed between the first surface and the second surface, or a third annular surface extending in a manner having an inclination different from that of the first surface and the second surface may be formed.

[0075] In addition, in the above-described embodiment, as Figure 5 shown, the first surface 21a of the mounting portion 21 of the burner main body 2 is linearly inclined, and the second surface 21b is curvedly inclined.

[0076] However, for the first surface of the present invention, it is only necessary that it gradually inclines upward toward the radially outer side, and the second surface gradually inclines downward toward the radially outer side. For example, although not shown, the first surface may be curvedly inclined, and the second surface may be linearly inclined.

[0077] In addition, in the above-described embodiment, as Figure 5As shown, the bottom of the groove 30a formed on the lower surface of the annular portion 30 of the burner head 3 (i.e., the upper surface of the flame hole P) gradually slopes upward linearly from the radially inner side toward the outer side in the radial direction.

[0078] However, the upper surface of the flame hole of the present invention is not limited to such a structure. For example, although not shown, the upper surface of the flame hole may slope curvilinearly or may gradually slope downward toward the outer side in the radial direction. In addition, the upper surface of the flame hole may not produce a slope in the radial direction.

[0079] In addition, in the above-described embodiment, as Figure 4 shown, the circumferential width of the groove 30a of the burner head 3 is configured to gradually increase from the outer circumference toward the radially central portion. This is to suppress the case where the boiling overflow that has invaded the flame hole further invades the inner circumferential side of the flame hole due to capillary action.

[0080] However, the circumferential width of the groove of the burner head of the present invention is not limited to such a structure. For example, although not shown, the circumferential width of the groove may be configured to be the same at any position in the radial direction or may be configured to gradually decrease toward the outer side in the radial direction.

[0081] In addition, in the above-described embodiment, as Figure 2 and Figure 3 shown, the outer diameter of the outer cylinder portion 20a (circumferential wall portion) of the burner body 2 is made to coincide with the outer diameter of the burner head 3.

[0082] However, the present invention is not limited to such a structure. For example, as described in the above-described embodiment, the outer diameter of the circumferential wall portion may be larger than the outer diameter of the burner head. On the contrary, although not shown, the outer diameter of the circumferential wall portion may also be smaller than the outer diameter of the burner head.

Claims

1. A stove burner comprising a burner body and an annular burner head, wherein the burner body is connected to the downstream end of a mixing tube that generates a mixed gas of fuel gas and primary air; and the burner head is mounted on the burner body to form a flame on the outer periphery. The burner head has an annular portion, and a plurality of grooves spaced apart in the circumferential direction and extending in the radial direction are provided on the lower surface of the annular portion. The burner body includes an annular contact portion that contacts the surface of the burner head where the groove is formed. The burner for stoves is characterized in that: The plurality of grooves and the abutment portion form a plurality of flame holes when the burner head is placed on the burner body. The flame hole has a first surface at the bottom and a second surface located on the outer peripheral side of the first surface. The first surface is linearly inclined gradually upward toward the radially outer side, The second surface gradually slopes downward toward the radially outer side. The bottom of the groove formed on the lower surface of the annular portion is linearly inclined from the radially inner side to the radially outer side and gradually tilted upward toward the radially outer side.

2. The burner for stoves according to claim 1, characterized in that: The circumferential width of the groove gradually increases from the outer circumference to the radial center.

3. The stove burner according to claim 1 or 2, characterized in that: The groove is provided in the burner head, The abutment portion is provided on the burner body, The burner body includes a cylindrical peripheral wall portion extending downward from the outer peripheral end of the abutment portion. The outer diameter of the peripheral wall portion is smaller than the outer diameter of the burner head.

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