Convection Burner

Abstract

To determine the phase of a burner head 2 with respect to a burner body 1 without adversely affecting sealing performance and combustibility between an inside cylinder part 11 and a seal cylinder part 21, in a stove burner comprising the burner body 1 having an inner and outer double cylindrical part of the inside cylindrical part 11 and an outside cylindrical part 12, and the burner head 2 installed on the burner body 1 and vertically provided with the seal cylinder part 21 internally fitted into the inside cylinder part 11.SOLUTION: One of an inside cylindrical part 11 and an outside cylindrical part 12 of a burner body 1, for example, the outside cylindrical part 12, is provided with a bulging part 123 that radially bulges toward the inside cylindrical part 11. Also, a burner head 2 is provided with a pair of phase-determining projecting pieces 26, 26 so as to sandwich the bulging part 123 from both sides in a circumferential direction and abut or closely face the bulging part 123, when the burner head 2 is installed on the burner body 1 in a regular phase.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 consisting of an inner cylindrical portion and an outer cylindrical portion, a burner head having a sealing cylindrical portion suspended from the inner cylindrical portion of the burner body and placed on the burner body so as to cover the distribution chamber inside the burner body from above, and a mixing tube extending outward from a part of the circumferential direction of the outer cylindrical portion of the burner body.The burner head has a number of flame ports opening 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] Conventionally, in this type of stove burner, a notch is formed in a portion of the circumference of the lower end of the cylindrical seal portion, and a protrusion is provided on the inner circumferential surface of the inner cylindrical portion of the burner body, which fits into the notch when the burner head is placed on the burner body in the correct phase (see, for example, Patent Document 1). According to this, when the burner head is placed in an irregular phase, the lower end of the part of the cylindrical seal portion other than the notch abuts on the protrusion, causing the burner head to float up from the burner body, and the user can be notified that the burner head is placed in the incorrect phase.

[0004] However, in the above-described configuration, the vertical seal length of the cylindrical seal portion relative to the inner cylindrical portion (the vertical length of the portion of the cylindrical seal portion that contacts the inner cylindrical portion) is shortened in the circumferential portion where the notches are formed, which may adversely affect the sealing performance between the inner cylindrical portion and the cylindrical seal portion. Furthermore, if the vertical seal length of the cylindrical seal portion relative to the inner cylindrical portion is made sufficiently long even in the circumferential portion where the notches are formed, the following problem occurs: The vertical length of the cylindrical seal portion becomes considerably longer in the portion other than the notches, which increases the airflow resistance of the burner central space surrounded by the cylindrical seal portion, which serves as a flow path for secondary air during burner combustion, and this increase in the vertical length of the cylindrical seal portion may adversely affect combustibility. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-214606 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above, the present invention aims to provide a stove burner that allows the phase of the burner head to be adjusted relative to the burner body without adversely affecting the sealing properties or combustion performance between the inner cylindrical portion and the sealing cylindrical portion. [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, a burner head having a sealing cylindrical portion suspended from the inner cylindrical portion of the burner body, which is 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 part of the circumferential direction of the outer cylindrical portion of the burner body, and the burner head has a number of flame ports opening on its outer peripheral 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, part The burner head is characterized in that it has a bulging portion that bulges radially toward the other of the inner and outer cylindrical portions, and the burner head has a pair of phase-determining protrusions that abut or closely face the bulging portion so as to sandwich the bulging portion from both circumferential sides when the burner head is placed on the burner body in the correct phase.

[0008] According to the present invention, the burner head is phased to the correct phase relative to the burner body by sandwiching a bulge provided on one of the inner and outer cylindrical portions of the burner body from both sides in the circumferential direction between a pair of phasing projections provided on the burner head. Therefore, unlike the above-mentioned conventional example in which a notch for phase setting is formed in the lower end of the cylindrical seal portion, the phase of the burner head can be determined relative to the burner body without adversely affecting the sealing performance or combustibility between the inner cylindrical portion and the cylindrical seal portion.

[0009] Furthermore, in the present invention, when an attempt is made to place the burner head in an irregular phase in which one of a pair of phasing protrusions located in one circumferential direction or the other circumferential direction is positioned away from the bulging portion in the other circumferential direction or in one circumferential direction, an upward step portion is provided on the peripheral surface of one of the inner and outer tubular portions of the burner body facing the other circumferential direction, against which the lower end of the phasing protrusion located in the other circumferential direction or in one circumferential direction abuts, and it is desirable that the lower end of the phasing protrusion abuts on this step portion, causing the burner head to float up from the burner body. This causes the burner head to float up from the burner body not only when an attempt is made to place the burner head in an irregular phase where one of the pair of phase-setting protrusions rides above the bulge, but also when an attempt is made to place the burner head in an irregular phase where one of the phase-setting protrusions on one side of the circumferential direction is located at a position away from the other side of the bulge, or where the phase-setting protrusion on the other side of the circumferential direction is located at a position away from the one side of the bulge, so that the user can be reliably notified that the burner head is placed in an irregular phase.

[0010] Furthermore, in the present invention The bulging portion is provided at one location in the circumferential direction of the outer cylindrical portion of the burner body, The bulge is hollow and has an internal space. The internal space of the bulge is configured as a small burner distribution chamber separated from the distribution chamber, to which the mixture is supplied from a small burner mixing tube separate from the mixing tube. The flame nozzles located in the circumferential direction of the burner head, which correspond to the bulge, are configured as small burner flame nozzles through which the mixture supplied to the small burner distribution chamber is ejected. This configuration significantly reduces the overall heat output of the stove burner and increases the turndown ratio by supplying the mixture only to the small burner distribution chamber and generating a flame only in the small burner flame nozzles. Furthermore, the bulge can be used to provide a small burner distribution chamber, which is a rational design. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view of a stove burner according to an embodiment of the present invention. [Figure 2] A cut-away 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] FIG. 3 is a cross-sectional plan view taken along line VV in FIG. 2. [Figure 6] (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; DETAILED DESCRIPTION OF THE INVENTION

[0012] 1 to 3, a stove burner according to an embodiment of the present invention includes a burner body 1 having a double cylindrical portion consisting of an inner cylindrical portion 11 and an outer cylindrical portion 12, a burner head 2 mounted on the burner body 1 so as to cover a distribution chamber 13 inside the burner body 1 from above, and a mixing tube 3 extending outward from a circumferential portion of the outer cylindrical portion 12 of the burner body 1. The burner head 2 has a number of flame ports 4 opening on its outer circumferential surface, spaced apart circumferentially. A fuel gas injected from a gas nozzle 5 facing the inlet 31 at the upstream end of the mixing tube 3 and primary air also flow in. A mixture (a mixture of fuel gas and primary air) supplied from a mixing passage 32 inside the mixing tube 3 via the distribution chamber 13 is ejected from the flame ports 4 and combusted.

[0013] 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 mixing tube 3 is constructed by joining a lower half portion 3a, which is integral with the lower body member 1a, and an upper half portion 3b, which is integral with the upper body member 1b.

[0014] 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 is vertically attached to its inner periphery, and 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 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.

[0015] 4 to 6, a small burner distribution chamber 13s is defined in the burner body 1 at a position halfway around the extension of the mixing tube 3. The small burner distribution chamber 13s is separated from the distribution chamber 13. More specifically, the outer cylindrical portion 12 of the burner body 1 has a small burner distribution chamber 13s at a position halfway around the extension of the mixing tube 3. One location in the circumferential direction A bulging portion 123 is provided that is positioned at the center of the inner tubular portion 11 and bulges radially inward toward the inner tubular portion 11. This bulging portion 123 is configured as a hollow structure with an internal space that is connected to the space between it and the skirt portion 122. This internal space and the space between it and the skirt portion 122 that is connected to it form the small burner distribution chamber 13s. In addition to the mixing tube 3, a small burner mixing tube 3s is provided that 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.

[0016] The flange 121 at the upper end of the outer tubular portion 12 has a passage hole 121a for the air-fuel mixture, located above the small burner distribution chamber 13s. The flame port provided in the circumferential portion corresponding to the small burner distribution chamber 13s of the burner head 2, i.e., the circumferential portion indicated by 2s in Fig. 5(a), is configured as a 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. This configuration provides a significant reduction in the overall heat output of the stove burner by supplying the air-fuel mixture only to the small burner distribution chamber 13s and generating a flame only in the small burner flame port 4s, which is advantageous.

[0017] Furthermore, a flame port provided in the center of the circumferential portion of the burner head 2 that coincides with the extending portion of the mixing tube 3 is configured as an ignition flame port 4i, and a target portion 23 that protrudes radially outward is provided directly above the ignition flame port 4i on the outer peripheral surface of the annular wall 22 of the burner head 2. Furthermore, an ignition plug 6 is provided that ignites the air-fuel mixture ejected from the ignition flame port 4i by spark discharge between the target portion 23 and the ignition flame port 4i. Furthermore, 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, and divides 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 parts. A through-hole 124a is formed in this partition wall portion 124, penetrating it in the vertical direction. The ignition plug 6 is inserted into this through-hole 124a. The burner head 2 is provided with a protruding eaves 24 that extends above the spark plug 6 to prevent boil-over from splashing on the spark plug 6.

[0018] In addition, to enable flame detection even when the air-fuel mixture is supplied only to the small burner distribution chamber 13s and a flame is generated only in the small burner flame nozzles 4s, a flame detection element 7 consisting of a thermocouple is provided facing a portion of the small burner flame nozzles 4s to detect the flame generated by the combustion of the air-fuel mixture ejected from that portion of the small burner flame nozzles 4s. Furthermore, when switching from a state in which a flame is generated only in the small burner flame nozzle 4s to a state in which a flame is also generated in the flame nozzles 4 other than the small burner flame nozzle 4s, a second flame detection element 7' consisting of a thermocouple is provided facing a portion of the flame nozzles 4 other than the small burner flame nozzle 4s to enable determination of whether the fire has spread to the flame nozzles 4 other than the small burner flame nozzle 4s. In addition, the burner head 2 has small protruding portions 25 positioned above each of the flame detection flame nozzles 4s, 4 facing the flame detection elements 7, 7' to suppress flame lift.

[0019] Furthermore, in this embodiment, the burner head 2 is provided with a pair of phasing protrusions 26, 26 that, when the burner head 2 is placed on the burner body 1 in the correct phase, sandwich the bulging portion 123 provided on the outer cylindrical portion 12 of the burner body 1 from both sides in the circumferential direction and abut against the bulging portion 123 (see FIGS. 5 and 6(a)). Also, on the circumferential surface facing the inner cylindrical portion 11 of the outer cylindrical portion 12, i.e., the inner circumferential surface, there is provided an upward step 125 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 or the other circumferential direction is located away from the bulging portion 123 in the other circumferential direction (see FIGS. 5 and 6(b)). The lower end of the phasing protrusion 26 comes into contact with this step 125, thereby lifting the burner head 2 from the burner body 1. The step 125 is provided at the upper edge of the opening of the bifurcated communication section 33, which connects the mixing passage 32 in the mixing tube 3 with the distribution chamber 13 in the burner body 1.

[0020] In this embodiment, the pair of phasing projections 26, 26 provided on the burner head 2 sandwich the bulging portion 123 provided on the outer cylindrical portion 12 of the burner body 1 from both sides in the circumferential direction, thereby phasing the burner head 2 to the correct phase with respect to the burner body 1. Therefore, unlike the above-mentioned conventional example in which a notch for phasing is formed in the lower end of the sealing cylindrical portion 21, the phase of the burner head 2 can be determined with respect to the burner body 1 without adversely affecting the sealing performance or combustibility between the inner cylindrical portion 11 of the burner body 1 and the sealing cylindrical portion 21. Furthermore, not only when an attempt is made to place the burner head 2 in an irregular phase in which one of the pair of phasing protrusions 26, 26 rides onto the bulging portion 123, but also when an attempt is made to place the burner head 2 in an irregular phase in which one of the phasing protrusions 26 in the circumferential direction is located at a position away from the other circumferential direction of the bulging portion 123, or when an attempt is made to place the burner head 2 in an irregular phase in which the phasing protrusion 26 in the other circumferential direction is located at a position away from the one circumferential direction of the bulging portion 123, the lower end of one of the phasing protrusions 26 will abut against the step portion 125, causing the burner head 2 to float up from the burner body 1. Therefore, the user can be reliably notified that the burner head 2 is placed in an irregular phase.

[0021] 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 bulging portion 123 for phasing the burner head 2 can be used to provide the small burner distribution chamber 13s, which is reasonable. However, it is also possible to not configure the internal space of the bulging portion 123 as the small burner distribution chamber 13s, or to form the bulging portion 123 as a solid structure. Also, in the above embodiment, when the burner head 2 is placed on the burner body 1 in the correct phase, a pair of phasing protrusions 26, 26 abut the bulging portion 123, sandwiching it from both sides in the circumferential direction. However, each phasing protrusion 26 may be arranged to face closely to the bulging portion 123. Furthermore, in the above embodiment, the outer cylindrical portion 12 of the burner body 1 is provided with the bulging portion 123 that bulges radially inward toward the inner cylindrical portion 11. However, it is also possible to provide the inner cylindrical portion 11 with a bulging portion that bulges radially outward toward the outer cylindrical portion 12. Furthermore, in the above embodiment, an annular burner head 2 is used, but it is also possible to use a non-annular burner head having a portion that closes the upper end of the central space surrounded by the cylindrical seal portion 21. [Explanation of symbols]

[0022] 1...burner body, 11...inner cylindrical portion, 12...outer cylindrical portion, 123...bulge portion, 125...step portion, 13...distribution chamber, 13s...distribution chamber for small burner, 2...burner head, 21...sealing cylindrical portion, 26...phase determining protrusion portion, 3...mixing tube, 3s...mixing tube for small burner, 4...flame nozzle, 4s...flame nozzle for small burner.

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 distribution chamber defined between the inner cylindrical portion and the outer cylindrical portion; a burner head having a sealing cylindrical portion suspended from above that fits into the inner cylindrical portion of the burner body and placed on the burner body so as to cover the distribution chamber from above; and a mixing tube extending outward from a circumferential part of the outer cylindrical portion of the burner body, wherein the burner head has a number of flame ports opening on its outer peripheral 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. A stove burner characterized in that a bulging portion is provided at one circumferential location on one of the inner and outer cylindrical portions of the burner body, bulging radially toward the other of the inner and outer cylindrical portions, and the burner head is provided with a pair of phase-determining protrusions that abut or closely face the bulging portion, sandwiching it from both sides in the circumferential direction, when the burner head is placed on the burner body in the correct phase.

2. A stove burner as described in claim 1, characterized in that when the burner head is placed in an irregular phase where one of the pair of phasing protrusions located in one circumferential direction or the other circumferential direction is located away from the bulge in the other circumferential direction, an upward step portion is provided on the peripheral surface of one of the inner and outer tubular portions of the burner body facing the other, and the lower end of the phasing protrusion in the other circumferential direction or one of the circumferential directions abuts against this step portion, causing the burner head to float up from the burner body.

3. A stove burner comprising a burner body having a double cylindrical portion consisting of an inner cylindrical portion and an outer cylindrical portion, a burner head having a sealing cylindrical portion suspended from above that fits into the inner cylindrical portion of the burner body and 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, wherein the burner head has a number of flame ports opening 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, A bulging portion that bulges radially toward the inner cylindrical portion is provided at one circumferential location on the outer cylindrical portion of the burner body, and a pair of phase-determining protrusions are provided on the burner head that abut against or closely face the bulging portion so as to sandwich the bulging portion from both circumferential sides when the burner head is placed on the burner body in the correct phase, The bulging portion is formed into a hollow structure with a space inside, and the internal space of the bulging portion is configured as a small burner distribution chamber separated from the distribution chamber to which the mixture is supplied from a small burner mixing tube separate from the mixing tube, and a flame port provided in the circumferential portion that matches the bulging portion 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.

4. A stove burner as described in Claim 3, characterized in that when an attempt is made to place the burner head in an irregular phase in which one of the pair of phasing protrusions located in one circumferential direction or the other circumferential direction is positioned away from the bulge in the other circumferential direction or one of the circumferential directions on the peripheral surface of the outer tubular portion of the burner body facing the inner tubular portion, an upward step portion is provided against which the lower end of the phasing protrusion located in the other circumferential direction or one of the circumferential directions abuts, and the lower end of the phasing protrusion abuts against this step portion, causing the burner head to float up from the burner body.

Images