Convection Burner

Abstract

To improve the certainty of flame detection, in a stove burner having a flame detection thermocouple 6 which is supplied with an in-use constant air-fuel mixture of the stove burner from a mixing pipe corresponding to a distribution chamber in a minimum body region, and heated by flames generated at a flame detection flame hole 3f being a part of a flame hole which is formed at a minimum head region 2S corresponding to the minimum body region, being the stove burner having a plurality of body regions and a plurality of head regions 2S, 2B which are obtained by dividing a burner body 1 and a burner head 2 in a peripheral direction, and supplying the air-fuel mixture from an independent mixing pipe to the distribution chambers in the plurality of body regions.SOLUTION: A flame detection flame hole 3f is a flame hole other than a flame hole 31 which is located at the outermost side in a peripheral direction out of flame holes existing in a minimum head region 2S, and constituted of a flame hole formed at a peripheral portion apart from a trivet claw coincidence portion 2a rather than the flame hole 31 which adjoins the outside of the trivet claw coincidence portion 2a.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a stove burner provided in a gas stove. [Background technology]

[0002] A stove burner generally comprises a burner body having a double cylindrical portion, an inner cylindrical portion and an outer cylindrical portion, and a burner head placed on the burner body so as to cover the distribution chamber inside the burner body from above. The burner head has a number of flame ports that open on its outer periphery and are spaced apart in the circumferential direction.

[0003] A conventional stove burner of this type is disclosed in Patent Document 1, which has a burner body and a burner head with a plurality of body regions and a plurality of head regions divided in the circumferential direction, and is provided with a plurality of mixing tubes that individually supply the air-fuel mixture to the distribution chambers in these plurality of body regions, and the air-fuel mixture supplied from each mixing tube corresponding to the distribution chamber in each body region is ejected from the flame nozzles in each head region corresponding to each body region.In this stove burner, the air-fuel mixture is constantly supplied from the corresponding mixing tube to the distribution chamber in the smallest body region, which has the shortest circumferential length among the plurality of body regions, while the stove burner is in use, and is provided with a flame detection thermocouple that is heated by a flame generated in a flame detection flame nozzle, which is part of the flame nozzles in the smallest head region corresponding to the smallest body region.

[0004] However, the amount of mixture sprayed out from the flame nozzle in the minimum head area is small, and if wind blows near the flame detection flame nozzle, the flame generated in the flame detection flame nozzle (more precisely, the flame generated by the combustion of the mixture sprayed out from the flame detection flame nozzle) may flicker and fall off the thermocouple, making it difficult to continue detecting the flame due to insufficient heating of the thermocouple. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 63-25409 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above, the present invention aims to provide a type of stove burner having multiple body regions and multiple head regions divided circumferentially, which can improve the reliability of flame detection. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a stove burner comprising a burner body having a double cylindrical portion consisting of an inner cylindrical portion and an outer cylindrical portion, and a burner head placed on the burner body so as to cover the distribution chamber in the burner body from above, and the burner head has a number of flame ports opening on its outer circumferential surface at intervals in the circumferential direction, and the burner body and the burner head have a number of body regions and a number of head regions that are divided in the circumferential direction, and are provided with a number of mixing tubes that individually supply air-fuel mixture to the distribution chambers in these body regions, and each of the mixing tubes corresponding to the distribution chambers in each body region. The gas mixture supplied from the mixing tube is ejected from the flame nozzles in each head region corresponding to each body region, and further, the gas mixture is constantly supplied from the corresponding mixing tube to a distribution chamber in the smallest body region, which has the shortest circumferential length among the plurality of body regions, while the stove burner is in use, and a flame detection thermocouple is provided which is heated by a flame generated in a flame detection flame nozzle, which is part of the flame nozzles in the smallest head region corresponding to the smallest body region, and is characterized in that the flame detection flame nozzle is made up of the flame nozzles in the smallest head region other than the flame nozzle located outermost in the circumferential direction.

[0008] Here, during low-power combustion where the mixture is supplied only to the distribution chamber within the minimum body region, the flame generated in the circumferentially outermost flame port in the minimum head region is prone to fluctuating toward the non-burning head region adjacent to the minimum head region when exposed to wind. In the present invention, the circumferentially outermost flame port in the minimum head region is not used as a flame detection flame port, so the flame generated in the flame detection flame port does not fluctuate like the flame generated in the circumferentially outermost flame port. Therefore, the flame generated in the flame detection flame port is prevented from fluctuating and moving away from the thermocouple, improving the reliability of flame detection.

[0009] The flame ports generally include a main flame port and sleeve flame ports with a smaller opening area than the main flame port. The portion of the burner head located within a predetermined circumferential range centered on the same direction as the trivet claws on the trivet placed on the stove top is designated the trivet claw-matched circumferential portion. Only sleeve flame ports are provided in the trivet claw-matched circumferential portion to prevent the large flame generated in the main flame port from touching the trivet claws and causing incomplete combustion. The main flame port is provided adjacent to the trivet claw-matched circumferential portion on the circumferential outside. The flame generated in the main flame port located adjacent to the trivet claw-matched circumferential portion on the circumferential outside is prone to flickering toward the trivet claw-matched circumferential portion when exposed to wind.

[0010] Therefore, in the present invention, when the minimum head region includes the trivet claw-matched circumferential portion, it is desirable that the flame detection flame port be configured as a flame port provided in a circumferential portion farther from the trivet claw-matched circumferential portion than the main flame port adjacent to the circumferential outside of the trivet claw-matched circumferential portion included in the minimum head region. In this way, the flame generated in the flame detection flame port does not fluctuate toward the trivet claw-matched circumferential portion like the flame generated in the main flame port adjacent to the circumferential outside of the trivet claw-matched circumferential portion. Therefore, it is possible to prevent the flame generated in the flame detection flame port from fluctuating and straying from the thermocouple, improving the reliability of flame detection.

[0011] Furthermore, in the present invention, when the flame ports include a main flame port and sleeve flame ports having a smaller opening area than the main flame ports, the flame detection flame ports preferably consist of a pair of main flame ports that generate flames that heat the thermocouples from both circumferential sides, and sleeve flame ports provided between the pair of main flame ports. This allows the thermocouples to be effectively heated by the outer flame of the flames generated by the pair of main flame ports, and the highly flame-stabilizing flames generated by the sleeve flame ports prevent flame lift and misfires generated by the main flame ports, further improving the reliability of flame detection. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a stove burner according to an embodiment of the present invention. [Figure 2] A cut side view taken along line II-II in Figure 1. [Figure 3] Cross-sectional view taken along line III-III in Figure 2. [Figure 4] FIG. 4 is a cross-sectional plan view taken along line IV-IV in FIG. 2. [Figure 5] (a) is a perspective view of a burner head constituting the stove burner of the embodiment, seen from diagonally below; (b) is a perspective view of a burner body constituting the stove burner of the embodiment, seen from diagonally above; [Figure 6] FIG. 2 is an enlarged external view of a main part of the stove burner according to the embodiment. [Figure 7] 1 is a perspective view of a main part of a stove equipped with a stove burner according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] 1 to 4, a stove burner according to an embodiment of the present invention comprises a burner body 1 having a double cylindrical portion consisting of an inner cylindrical portion 11 and an outer cylindrical portion 12, and a burner head 2 placed on the burner body 1 so as to cover the distribution chamber 13 inside the burner body 1 from above. The burner head 2 has a large number of flame ports 3 that open onto its outer circumferential surface and are spaced apart in the circumferential direction.

[0014] The burner body 1 is constructed by joining an upper body member 1b, which has an outer cylindrical portion 12, to a lower body member 1a, which has an inner cylindrical portion 11 erected on its inner periphery. The upper body member 1b has a skirt portion 122 that hangs down from the outer periphery of a flange portion 121 at the upper end of the outer cylindrical portion 12 and reaches the lower body member 1a. The burner head 2 is annular, and a sealing cylindrical portion 21 that fits into the inner cylindrical portion 11 of the burner body 1 hangs down from its inner periphery. In addition, an annular wall 22 that seats on the flange portion 121 at the upper end of the outer cylindrical portion 12 of the burner body 1 hangs down from the outer periphery of the underside of the burner head 2. A number of grooves that become flame ports 3 are formed in this annular wall 22 at intervals in the circumferential direction.

[0015] In this embodiment, the burner body 1 and the burner head 2 have multiple body regions and multiple head regions divided circumferentially. Specifically, with reference to FIG. 5 , the burner body 1 is divided into two body regions: a small body region 1S with a short circumferential length and a large body region 1B other than the small body region 1S. The burner head 2 is also divided into two head regions: a small head region 2S with a short circumferential length, which is a circumferential portion corresponding to the small body region 1S, and a large head region 2B, which is a circumferential portion corresponding to the large body region 1B. The small body region 1S has a bulging portion 123 that bulges radially inward from the outer cylindrical portion 12 toward the inner cylindrical portion 11. This bulging portion 123 has a hollow structure with an internal space connected to the space between it and the skirt portion 122. This internal space and the space between it and the skirt portion 122 form a distribution chamber 13S in the small body region 1S, which is separated from the distribution chamber 13B in the large body region 1B. Furthermore, a passage hole 121a for the air-fuel mixture located above the distribution chamber 13S in the small body region 1S is formed in the flange portion 121 at the upper end of the outer tubular portion 12. The air-fuel mixture supplied from the distribution chamber 13S in the small body region 1S through the passage hole 121a is ejected and combusted from the flame port 3 in the small head region 2S, and the air-fuel mixture supplied from the distribution chamber 13B in the large body region 1B is ejected and combusted from the flame port 3 in the large head region 2B.

[0016] Referring also to Figure 6, the burner head 2 is provided with flame ports 3, which include a main flame port 31 and sleeve flame ports 32 with a smaller opening area than the main flame port 31. Here, the portion of the burner head 2 located within a predetermined circumferential range centered at the same position as each trivet claw 81 provided on the trivet 8 placed on the stove top 7 shown in Figure 7 is designated as the trivet claw-matching circumferential portion 2a, and only sleeve flame ports 32 are provided in the trivet claw-matching circumferential portion 2a, while the main flame ports 31 are provided in the portion adjacent to the circumferential outside of the trivet claw-matching circumferential portion 2a. In addition, the main flame ports 31 and sleeve flame ports 32 are arranged alternately in the portions other than the trivet claw-matching circumferential portion 2a.

[0017] The stove burner of this embodiment further includes two mixing tubes 4B, 4S that individually supply the air-fuel mixture to the distribution chamber 13B in the large body region 1B and the distribution chamber 13S in the small body region 1S. Separate gas nozzles 42B, 42S face the inlet ports 41B, 41S of each mixing tube 4B, 4S. The distribution chamber 13S in the small body region 1S is constantly supplied with the air-fuel mixture from the corresponding mixing tube 4S while the stove burner is in use.

[0018] The mixing tube 4B for the large body region 1B extends outward from the circumferential center of the large body region 1B. An ignition flame nozzle 3i is provided at the center of the circumferential portion of the large head region 2B that coincides with the extending portion of the mixing tube 4B. A target portion 23 protruding radially outward is provided directly above the ignition flame nozzle 3i on the outer circumferential surface of the annular wall 22 of the burner head 2. An ignition plug 5 is provided to ignite the air-fuel mixture ejected from the ignition flame nozzle 3i by spark discharge with the target portion 23. A partition wall 124 is provided in the large body region 1B, positioned at the center of the circumferential portion that coincides with the extending portion of the mixing tube 4B. This partition wall 124 bifurcates the communication portion 44B between the passage 43B in the mixing tube 4B and the distribution chamber 13B in the large body region 1B. A through-hole 124a is formed in the partition wall 124, penetrating vertically. The spark plug 5 is inserted into this through hole 124a. The burner head 2 is provided with a canopy 24 that projects above the spark plug 5 to prevent boil-over from splashing on the spark plug 5.

[0019] In addition, a flame detection thermocouple 6 is provided that is heated by the flame generated in the flame detection flame port 3f, which is part of the flame port 3 in the small head region 2S, so that a flame can be detected even when the air-fuel mixture is supplied only to the distribution chamber 13S in the small body region 1S and a flame is generated only in the flame port 3 in the small head region 2S. Furthermore, a second flame detection thermocouple 6' is provided facing the flame detection flame port 3f', which is part of the flame port 3 in the large head region 2B, so that it can be determined whether the fire has spread to the flame port 3 in the large head region 2B when switching from a state in which a flame is generated only in the flame port 3 in the small head region 2S to a state in which a flame is also generated in the flame port 3 in the large head region 2B. In addition, small protrusions 25 are provided on the burner head 2 above each of the flame detection flame ports 3f, 3f' to suppress flame lift.

[0020] The burner head 2 is further provided with a pair of phasing protrusions 26, 26 that engage with the bulging portion 123 provided on the outer cylindrical portion 12 of the burner body 1 so as to sandwich the bulging portion 123 from both circumferential sides when the burner head 2 is placed on the burner body 1 in the correct phase (see FIG. 5(a)). Also, an upward step 125 is provided on the upper part of the inner peripheral surface of the outer cylindrical portion 12 against which the lower end of the phasing protrusion 26 in the other circumferential direction abuts when an attempt is made to place the burner head 2 in an irregular phase in which the phasing protrusion 26 in one circumferential direction of the pair of phasing protrusions 26, 26 located on one circumferential direction is located at a position away from the bulging portion 123 in the other circumferential direction or in one circumferential direction (see FIG. 5(b)). When the lower end of the phasing protrusion 26 abuts against this step 125, the burner head 2 is lifted from the burner body 1, making it possible to notify the user that the burner head 2 is placed in an incorrect phase. The step 125 is provided at the upper edge of the opening to the distribution chamber 13B of the bifurcated communication part 44B that communicates between the passage 43B in the mixing tube 4B and the distribution chamber 13B in the large body region 1B.

[0021] During low-power combustion, in which the air-fuel mixture is supplied only to the distribution chamber 13S in the small body region 1S, the smallest body region with the shortest circumferential length, the flame generated in the main flame port 31, which is the flame port located at the circumferential outermost position among the flame ports 3 in the small head region 2S, tends to fluctuate toward the large head region 2B, which is adjacent to the small head region 2S and is not burning, when exposed to wind.Furthermore, the flame generated in the main flame port 31, located adjacent to the circumferential outer side of the trivet claw matching circumferential portion 2a, tends to fluctuate toward the trivet claw matching circumferential portion 2a when exposed to wind. Therefore, as shown in Figure 6, the flame detection flame port 3f provided in the small head region 2S is composed of a flame port other than the main flame port 31 located at the circumferential outermost position among the flame ports 3 present in the small head region 2S, and is provided in a circumferential portion farther from the trivet claw matching circumferential portion 2a than the main flame port 31 adjacent to the circumferential outer side of the trivet claw matching circumferential portion 2a included in the small head region 2S.

[0022] This prevents the flame generated in the flame detection nozzle 3f from flickering toward the large head region 2B, as does the flame generated in the main nozzle 31 located at the outermost circumferential position of the small head region 2S, nor from flickering toward the trivet claw-matching circumferential portion 2a, as does the flame generated in the main nozzle 31 adjacent to the outer circumferential side of the trivet claw-matching circumferential portion 2a. This prevents the flame generated in the flame detection nozzle 3f from flickering and moving away from the thermocouple 6, improving the reliability of flame detection.

[0023] In this embodiment, the flame detection nozzle 3f is composed of a pair of main nozzles 31 that generate a flame that scorches the thermocouple 6 from both circumferential sides, and a sleeve nozzle 32 that is provided between the pair of main nozzles 31. This allows the thermocouple 6 to be effectively heated by the outer flame of the flame generated in the pair of main nozzles 31, and also prevents the flame generated in the main nozzle 31 from lifting or misfire by the highly flame-stabilizing flame generated in the sleeve nozzle 32, further improving the reliability of flame detection. The flame detection nozzle 3f' provided in the large head region 2B is also composed of a pair of main nozzles 31 that generate a flame that scorches the thermocouple 6' from both circumferential sides, and a sleeve nozzle 32 that is provided between the pair of main nozzles 31.

[0024] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the burner body 1 is divided into two body regions 1B and 1S, one large and one small, and the burner head 2 is also divided into two head regions 2B and 2S, one large and one small, but it is also possible to divide the burner body 1 and the burner head 2 into three or more body regions and head regions, one large and one small. Furthermore, in the above embodiment, an annular burner head 2 is used, but it is also possible to use a non-annular burner head 2 having a portion that closes the upper end of the central space surrounded by the sealing cylindrical portion 21. [Explanation of symbols]

[0025] 1...burner body, 1B...large body area, 1S...small body area (smallest body area), 11...inner cylinder, 12...outer cylinder, 13...distribution chamber, 13B...distribution chamber within large body area, 13S...distribution chamber within small head area, 2...burner head, 2B...large head area, 2S...small head area (smallest head area), 2a...circumferential portion where trivet claws match, 3...flame nozzle, 31...main flame nozzle, 32...sleeve flame nozzle, 3f...flame detection nozzle, 6...thermocouple, 7...top plate, 8...trivet, 81...trivet claws.

Claims

1. A stove burner comprising a burner body having a double cylindrical portion consisting of an inner cylindrical portion and an outer cylindrical portion, and a burner head placed on the burner body so as to cover the distribution chamber in the burner body from above, wherein the burner head has a number of flame ports opening on its outer peripheral surface at intervals in the circumferential direction, The burner body and the burner head have a plurality of body regions and a plurality of head regions divided in the circumferential direction, and are provided with a plurality of mixing tubes that individually supply air-fuel mixtures to distribution chambers in the plurality of body regions, and the air-fuel mixtures supplied from each mixing tube corresponding to the distribution chambers in each body region are ejected from flame ports present in each head region corresponding to each of the body regions, Furthermore, a mixture is constantly supplied from the corresponding mixing tube to a distribution chamber in the smallest body region, which has the shortest circumferential length among the plurality of body regions, during use of the stove burner, and a flame detection thermocouple is provided which is heated by a flame generated in a flame detection flame port, which is a part of the flame ports present in the smallest head region corresponding to the smallest body region, A stove burner characterized in that the flame detection flame ports are composed of flame ports other than the flame ports located at the outermost circumferential direction among the flame ports present in the minimum head region.

2. 2. The stove burner according to claim 1, wherein the burner ports are a main flame port and a sleeve flame port having an opening area smaller than that of the main flame port, and the portion of the burner head located within a predetermined circumferential range centered on a point in the same direction as each trivet claw provided on a trivet placed on the stove top is defined as the trivet claw matching circumferential portion, and only the sleeve flame port is provided in the trivet claw matching circumferential portion, and the main flame port is provided in a portion adjacent to the trivet claw matching circumferential portion on the circumferential outside, and the minimum head area includes the trivet claw matching circumferential portion, A stove burner characterized in that the flame detection flame port is composed of a flame port provided in a circumferential portion farther from the trivet claw matching circumferential portion than the main flame port adjacent to the circumferential outside of the trivet claw matching circumferential portion included in the minimum head area.

3. 2. The stove burner according to claim 1, wherein the flame ports are provided with a main flame port and a sleeve flame port having an opening area smaller than that of the main flame port, The flame detection flame port is characterized by being composed of a pair of main flame ports that generate flames that heat the thermocouple from both sides in the circumferential direction, and a sleeve flame port that is provided between the pair of main flame ports.

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