Cooker burner

Abstract

To prevent a high voltage cord connected to a connection terminal part 63 of an ignition plug 6 from coming into contact with an extension part of a mixing pipe 3 without paying attention to handling of the high voltage cord, in a stove burner comprising a burner body 1, a burner head 2 installed on the burner body 1, and the mixing pipe 3 extending outward from a circumferential part of the burner body 1, and further comprising an ignition plug 6 that ignites an ignition flame port 4i provided in a central part of a circumferential portion of the burner head 2 that coincides with the extension portion of the mixing pipe 3.SOLUTION: A burner body 1 is provided with a partition wall part 124 that is positioned at a center part of a circumferential portion matching an extension portion of a mixing pipe 3, and divides a communication part between a mixing passage 32 in the mixing pipe 3 and a distribution chamber 13 in the burner body 1 into two circumferentially divided ones. An ignition plug 6 is inserted through a vertical through hole 124a formed in the partition wall part 124, so that a connection terminal part 63 of the ignition plug 6 protrudes below a lower end of the partition wall part 124.SELECTED DRAWING: Figure 2

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, a burner head placed on the burner body so as to cover the distribution chamber in the burner body from above, and a mixing tube extending outward from a circumferential part of the outer cylindrical portion of the burner body.The burner head has a large number of flame ports that open on its outer circumferential surface at intervals in the circumferential direction, and the mixed gas supplied from the mixing passage in the mixing tube through the distribution chamber is ejected from these flame ports and combusted.

[0003] Also, as a conventional stove burner of this type, a flame port provided in the center of the circumferential part of the burner head that matches the extending part of the mixing tube is configured as an ignition flame port, and an ignition plug is provided that ignites the mixture ejected from the ignition flame port by spark discharge between the target part provided in the part located above the ignition flame port on the outer periphery of the burner head (see, for example, Patent Document 1). According to this, since the ignition flame port is located at the position closest to the extending part of the mixing tube, when gas supply to the stove burner is started, the mixture from the mixing tube is quickly ejected from the ignition flame port and ignited, which prevents problems such as a large flame being generated at the time of ignition due to a delay in ignition.

[0004] Incidentally, the ignition plug has an insulator part that is elongated in the vertical direction, an electrode part that protrudes upward from the insulator part and faces the target part, and a connection terminal part that protrudes downward from the insulator part. When an ignition flame port is provided in the center of the circumferential part of the burner head that matches the extending part of the mixing tube as in the above conventional example, the ignition plug is disposed directly above the extending part of the mixing tube, and the connection terminal part of the ignition plug approaches the upper surface of the extending part of the mixing tube. Here, if the high-voltage cord connected to the connection terminal part touches the upper surface of the extending part of the mixing tube, the high-voltage cord is heated by heat transfer from the burner body during burner combustion, which adversely affects its durability. Therefore, it is necessary to route the high-voltage cord so that it does not touch the upper surface of the extending part of the mixing tube, which makes it difficult to route the high-voltage cord. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-166640 A Summary of the Invention [Problem to be solved by the invention]

[0006] In consideration of the above, the present invention has an object to provide a stove burner in which a flame nozzle provided in the center of the circumferential part of the burner head that coincides with the extended part of the mixing tube is configured as an ignition flame nozzle, and which prevents the high-voltage cord connected to the connection terminal part of the ignition plug from touching the extended part of the mixing tube without the need to pay attention to the routing of the high-voltage cord. [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, an inner cylindrical portion and an outer cylindrical portion, a burner head placed on the burner body so as to cover the distribution chamber in the burner body from above, and a mixing tube extending outward from a circumferential part of the outer cylindrical portion of the burner body, the burner head being provided with a large number of flame ports opening on its outer circumferential surface at intervals in the circumferential direction, and the mixed gas supplied from a mixing passage in the mixing tube through the distribution chamber is ejected from these flame ports and combusted, the flame port provided in the center of the circumferential part of the burner head coinciding with the extending part of the mixing tube being configured as an ignition flame port, and a spark discharge occurs between the flame port provided in the center of the circumferential part of the burner head which coincides with the extending part of the mixing tube and a target portion provided in a part located above the ignition flame port on the outer periphery of the burner head. The burner body has an outer cylindrical portion of a burner body, a partition wall portion located in the center of a circumferential portion that matches the extending portion of the mixing tube, which divides the communication portion between the mixing passage and the distribution chamber into two circumferentially separated branches, and a through hole penetrating in the vertical direction is formed in the partition wall portion, and the insulator portion of the ignition plug is inserted into the through hole, so that the electrode portion of the ignition plug protrudes above the upper end of the partition wall portion and the connection terminal portion of the ignition plug protrudes below the lower end of the partition wall portion.

[0008] According to the present invention, the insulator portion of the spark plug is inserted into the through hole formed in the partition wall portion located at the circumferential center of the extended portion of the mixing tube, and the connection terminal portion protrudes downwardly from the lower end of the partition wall portion, i.e., below the underside of the extended portion of the mixing tube, so that the high-voltage cord connected to the connection terminal portion can be prevented from touching the extended portion of the mixing tube without having to pay attention to the routing of the high-voltage cord.

[0009] In addition, in the present invention, it is desirable to define a small burner distribution chamber separated from the distribution chamber in a circumferential portion of the burner body circumferentially away from the extending portion of the mixing tube, to which the mixture is supplied from a small burner mixing tube separate from the above-mentioned mixing tube, and to configure a flame port provided in a circumferential portion that coincides with the small burner distribution chamber of the burner head as a small burner flame port from which the mixture supplied to the small burner distribution chamber is sprayed.

[0010] According to this, by supplying the mixture only to the small burner distribution chamber and generating a flame only in the small burner nozzle, the fire power of the entire stove burner can be significantly weakened and the turndown ratio can be increased. It is also possible to configure one of the small burner nozzles as an ignition nozzle, but in this case, it takes time for the fire to spread to all the nozzles other than the small burner nozzle after the ignition nozzle is ignited. In contrast, in the present invention, the ignition nozzle is configured with a nozzle other than the small burner nozzle provided in the center of the circumferential part of the burner head that matches the extension part of the mixing tube, so that the ignition nozzle is quickly ignited and the fire can be quickly spread from the ignition nozzle to the small burner nozzle via the nozzle other than the small burner nozzle, which is advantageous.

[0011] Furthermore, it is desirable that the circumferential portion of the burner head where the small burner flame port is provided faces the direction in which the operation part for the stove burner of the gas stove is arranged. In this way, a large flame is not generated near the hand operating the operation part for the stove burner, giving a sense of security to the user.

[0012] In addition, it is desirable to provide a flame detection element that faces a part of the small burner flame ports and detects the flame generated by the combustion of the mixture sprayed from the part of the small burner flame ports so that the flame can be detected even when the mixture is supplied only to the small burner distribution chamber and a flame is generated only in the small burner flame port. In this case, if the small burner distribution chamber is defined in a part of the burner body that is half a circumference away from the extension part of the mixing tube, when the flame is detected by the flame detection element, the flame has spread to all the flame ports, including the flame ports other than the small burner flame port, and safety is guaranteed. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of a stove burner according to an embodiment of the present invention. [Diagram 2] A cut side view taken along line II-II in Figure 1. [Diagram 3] 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional plan view taken along line IV-IV in FIG. 2. [Diagram 5] (a) is an oblique view of a burner head constituting a stove burner of the embodiment, seen from diagonally below; (b) is an oblique view of a burner body constituting a stove burner of the embodiment, seen from diagonally above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] 1 to 3, the stove burner according to the embodiment of the present invention includes a burner body 1 having a double cylindrical portion, an inner cylindrical portion 11 and an outer cylindrical portion 12, a burner head 2 placed on the burner body 1 so as to cover the distribution chamber 13 in the burner body 1 from above, and a mixing tube 3 extending outward from a circumferential part of the outer cylindrical portion 12 of the burner body 1. The burner head 2 has a large number of flame ports 4 opening on its outer circumferential surface at intervals in the circumferential direction. The inlet 31 at the upstream end of the mixing tube 3 receives fuel gas injected from a gas nozzle 5 provided facing the inlet 31, and primary air also flows in. Then, the mixture (mixture of fuel gas and primary air) supplied from the mixing passage 32 in the mixing tube 3 through the distribution chamber 13 is ejected from the flame port 4 and combusted.

[0015] The burner body 1 is constructed by joining an upper body member 1b having an outer cylindrical portion 12 to a lower body member 1a having an inner cylindrical portion 11 standing 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 mixing tube 3 is constructed by joining a lower half portion 3a integral with the lower body member 1a and an upper half portion 3b integral with the upper body member 1b.

[0016] The burner head 2 is annular, and a seal cylinder 21 that fits into the inner cylinder 11 of the burner body 1 is vertically attached to its inner periphery, and an annular wall 22 that seats on a flange 121 at the upper end of the outer cylinder 12 of the burner body 1 is vertically attached to the outer periphery of the lower surface of the burner head 2. A large number of grooves that become the flame ports 4 are formed in this annular wall 22 at intervals in the circumferential direction.

[0017] Also, referring to Figures 4 and 5, a small burner distribution chamber 13s separated from the distribution chamber 13 is defined in a circumferential part of the burner body 1 circumferentially away from the extending part of the mixing tube 3, specifically, in a part of the burner body 1 half a turn away from the extending part of the mixing tube 3. More specifically, a bulging part 123 is provided in the outer cylindrical part 12 of the burner body 1, positioned half a turn away from the extending part of the mixing tube 3, and bulging radially inward toward the inner cylindrical part 11. This bulging part 123 is configured as a hollow structure having an internal space connected to the space between the bulging part 123 and the skirt part 122. The small burner distribution chamber 13s is formed by this internal space and the space between the bulging part 122 and the skirt part 122 connected thereto. In addition to the mixing tube 3, a small burner mixing tube 3s is provided which is connected to the small burner distribution chamber 13s. A mixture of fuel gas and primary air injected from a small burner gas nozzle 5s arranged facing the inlet 31s at the upstream end of the small burner mixing tube 3s is supplied from the small burner mixing tube 3s to the small burner distribution chamber 13s.

[0018] A passage hole 121a for the air-fuel mixture is formed above the small burner distribution chamber 13s in the flange portion 121 at the upper end of the outer tubular portion 12. In addition, the flame port provided in the circumferential portion that matches the small burner distribution chamber 13s of the burner head 2, i.e., the circumferential portion shown by 2s in Fig. 5(a), is configured as the small burner flame port 4s from which the air-fuel mixture supplied from the small burner distribution chamber 13s through the passage hole 121a is ejected.

[0019] According to the above configuration, the mixture is supplied only to the small burner distribution chamber 13s, and a flame is generated only in the small burner flame port 4s, which makes it possible to significantly weaken the firepower of the entire stove burner and increase the turndown ratio, which is advantageous. In addition, the circumferential portion 2s of the burner head 2 where the small burner flame port 4s is provided faces the direction in which the operation part for the stove burner of the gas stove is arranged. This prevents a large flame from being formed near the hand operating the operation part for the stove burner, giving the user a sense of security.

[0020] In this embodiment, the flame port provided in the center of the circumferential portion of the burner head 2 that matches the extending portion of the mixing tube 3 is configured as the ignition flame port 4i. A target portion 23 protruding outward in the radial direction is provided in the portion located above the ignition flame port 4i on the outer periphery of the burner head 2, that is, directly above the ignition flame port 4i on the outer periphery of the annular wall 22 of the burner head 2. An ignition plug 6 is provided to ignite the mixture ejected from the ignition flame port 4i by spark discharge with the target portion 23. The ignition plug 6 has a vertically long insulator portion 61 that is the main body portion, an electrode portion 62 that protrudes upward from the insulator portion 61 and faces the target portion 23, and a connection terminal portion 63 that protrudes downward from the insulator portion 61 and to which a high-voltage cord (not shown) extending from an igniter is connected. Further, the burner head 2 is provided with a visor portion 24 that projects above the spark plug 6 in order to prevent boil-over from splashing on the spark plug 6.

[0021] As described above, if the ignition flame nozzle 4i is provided in the center of the circumferential part of the burner head 2 that matches the extending part of the mixing tube 3, when gas supply to the stove burner is started, the mixture from the mixing tube 3 is quickly ejected from the ignition flame nozzle 4i and ignited, and it is possible to prevent a problem such as a large flame being generated at the time of ignition due to a delay in ignition. It is also possible to configure one of the small burner flame nozzles 4s as the ignition flame nozzle. However, in this case, it takes time for the fire to spread from the ignition flame nozzle ignition to the entire flame nozzle 4 other than the small burner flame nozzle 4s. In contrast, in the present embodiment, the ignition flame nozzle 4i is formed by a flame nozzle other than the small burner flame nozzle 4s provided in the central part of the circumferential part of the burner head 2 that coincides with the extension part of the mixing tube 3, so that the ignition flame nozzle 4i is quickly ignited as described above, and the fire can be quickly transferred from the ignition flame nozzle 4i to the small burner flame nozzle 4s via the flame nozzles 4 other than the small burner flame nozzle 4s, which is advantageous.

[0022] However, if the ignition flame port 4i is provided in the center of the circumferential portion of the burner head 2 that coincides with the extending portion of the mixing tube 3, the ignition plug 6 will also be disposed in the circumferential portion that coincides with the extending portion of the mixing tube 3. For this reason, it is generally necessary to route the high-voltage cord connected to the connection terminal portion 63 of the ignition plug 6 so as not to touch the extending portion of the mixing tube 3, which makes the routing of the high-voltage cord troublesome. Therefore, in this embodiment, the following configuration is used to prevent the high-voltage cord from touching the extending portion of the mixing tube 3 without having to pay attention to the routing of the high-voltage cord.

[0023] That is, a partition wall portion 124 is provided in the outer cylindrical portion 12 of the burner body 1, located in the center of the circumferential portion that coincides with the extending portion of the mixing tube 3, dividing the communication portion 33 between the mixing passage 32 in the mixing tube 3 and the distribution chamber 13 in the burner body 1 into two circumferentially separated portions, and a through hole 124a that penetrates in the vertical direction is formed in this partition wall portion 124. Then, the insulator portion 61 of the spark plug 6 is inserted into this through hole 124a, so that the electrode portion 62 of the spark plug 6 protrudes above the upper end of the partition wall portion 124, and the connection terminal portion 63 of the spark plug 6 protrudes below the lower end of the partition wall portion 124. According to this, the connection terminal portion 63 is located below the lower end of the partition wall portion 124, i.e., the lower surface of the extended portion of the mixing tube 3, so that the high-voltage cord connected to the connection terminal portion 63 can be prevented from touching the extended portion of the mixing tube 3 without having to pay attention to how the high-voltage cord is routed.

[0024] In this embodiment, in order to detect a flame even when the mixture is supplied only to the small burner distribution chamber 13s and a flame is generated only in the small burner flame nozzle 4s, a flame detection element 7 consisting of a thermocouple is provided facing a part of the small burner flame nozzle 4s to detect a flame generated by the combustion of the mixture ejected from the part of the small burner flame nozzle 4s. Here, in this embodiment, the small burner distribution chamber 13s is defined in a part of the burner body 1 half a circumference away from the extension part of the mixing tube 3, so that when a flame is detected by the flame detection element 7, the flame has spread to all the flame nozzles 4, 4s, including the flame nozzles 4 other than the small burner flame nozzle 4s, and safety is ensured.

[0025] In this embodiment, when switching from a state in which a flame is generated only in the small burner flame port 4s to a state in which a flame is generated in the flame ports 4 other than the small burner flame port 4s, a second flame detection element 7' made of a thermocouple is provided facing a part of the flame port 4 other than the small burner flame port 4s so that it is possible to determine whether or not the flame has spread to the flame ports 4 other than the small burner flame port 4s. Also, the burner head 2 is provided with a small protruding portion 25 for suppressing the lift of the flame, positioned above each flame port 4s, 4 for flame detection facing each flame detection element 7, 7'.

[0026] Furthermore, in this embodiment, the burner head 2 is 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, on the upper part of the inner peripheral surface of the outer cylindrical portion 12, an upward step 125 is provided against which the lower end of the phasing protrusion 26 in the other circumferential direction or one of the circumferential directions abuts when the burner head 2 is placed in an irregular phase in which the phasing protrusion 26 in one circumferential direction or the other of the pair of phasing protrusions 26, 26 is located away from the bulging portion 123 in the other circumferential direction or one of the circumferential directions (see FIG. 5(b)). When the lower end of the phasing projection 26 comes into contact with this step 125, the burner head 2 is lifted from the burner body 1, and the user is informed that the burner head 2 is placed in an incorrect phase. The step 125 is provided at the upper edge of the opening of the bifurcated communication part 33, which communicates the mixing passage 32 in the mixing tube 3 with the distribution chamber 13 in the burner body 1, to the distribution chamber 13.

[0027] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, a small burner distribution chamber 13s separated from the distribution chamber 13 is provided in a circumferential portion of the burner body 1, but the present invention can also be applied to a stove burner in which the distribution chamber 13 is present over the entire circumference of the burner body 1 without providing a small burner distribution chamber 13s. In addition, in the above embodiment, a ring-shaped burner head 2 is used, but a non-ring-shaped burner head having a portion that closes the upper end of the central space surrounded by the sealing cylinder portion 21 can also be used. [Explanation of symbols]

[0028] 1...burner body, 11...inner cylindrical portion, 12...outer cylindrical portion, 124...partition wall portion, 124a...through hole, 13...distribution chamber, 13s...distribution chamber for small burner, 2...burner head, 2s...circumferential portion of burner head where flame port for small burner is provided, 23...target portion, 3...mixing tube, 3s...mixing tube for small burner, 32...mixing passage, 33...communication portion, 4...flame port, 4i...ignition flame port, 4s...flame port for small burner, 6...ignition plug, 61...insulator portion, 62...electrode portion, 63...connection terminal portion, 7...flame detection element.

Claims

1. A stove burner comprising a burner body having a double cylindrical portion, an inner cylindrical portion and an outer cylindrical portion, a burner head placed on the burner body so as to cover the distribution chamber in the burner body from above, and a mixing tube extending outward from a circumferential part of the outer cylindrical portion of the burner body, the burner head having a large number of flame ports opening on its outer circumferential surface at intervals in the circumferential direction, and a mixture gas supplied from a mixing passage in the mixing tube through the distribution chamber is ejected from these flame ports and combusted, The burner head has a flame port provided in the center of a circumferential portion of the burner head that matches the extending portion of the mixing tube, and the burner head is provided with an ignition plug that ignites the air-fuel mixture ejected from the ignition port by spark discharge between the ignition port and a target portion provided in a portion of the outer periphery of the burner head located above the ignition port, the ignition plug having a main body portion that is an insulator portion that is long in the vertical direction, an electrode portion that protrudes upward from the insulator portion and faces the target portion, and a connection terminal portion that protrudes downward from the insulator portion, A stove burner characterized in that a partition wall portion is provided on the outer cylindrical portion of the burner body, located in the center of the circumferential portion that coincides with the extended portion of the mixing tube, and that divides the communication portion between the mixing passage and the distribution chamber into two circumferentially separated branches, and a through hole is formed in this partition wall portion that penetrates in the vertical direction, and an insulator portion of an ignition plug is inserted into this through hole, so that the electrode portion of the ignition plug protrudes above the upper end of the partition wall portion and the connection terminal portion of the ignition plug protrudes below the lower end of the partition wall portion.

2. A stove burner as described in claim 1, characterized in that a small burner distribution chamber separated from the distribution chamber is defined, and a mixture is supplied from a small burner mixing tube separate from the mixing tube to a circumferential portion of the burner body circumferentially away from the extended portion of the mixing tube, and a flame port provided in a circumferential portion corresponding to the small burner distribution chamber of the burner head is configured as a small burner flame port from which the mixture supplied to the small burner distribution chamber is sprayed.

3. 3. The stove burner according to claim 2, wherein the circumferential portion of the burner head in which the small burner flame port is provided faces a direction in which an operating part for the stove burner of a gas stove is arranged.

4. A stove burner as described in claim 2 or 3, characterized in that the small burner distribution chamber is defined in a portion of the burner body half a circumference away from the extended portion of the mixing tube, and a flame detection element is provided facing a portion of the small burner flame ports to detect the flame generated by the combustion of the mixture sprayed from the portion of the small burner flame port.

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