Burner

Abstract

The rod body is equipped with a burner that reduces the possibility of malfunctions caused by heat. [Solution] The burner comprises a burner body and a rod supported by a flange, which performs at least one of ignition of a combustion section and detection of the combustion state, wherein the rod includes a cylindrical rod body and a rod-shaped rod electrode inserted into the rod body for ignition or detection, the rod body having its axial direction oriented vertically and supported by the flange on the lower side of the flange, and the rod electrode includes a first portion extending in the axial direction of the rod body, projecting upward from the rod body and extending to a position above the flange, and a second portion extending from the portion of the first portion located above the flange in a direction intersecting the direction in which the first portion extends, to a position facing the combustion surface.

Description

Technical Field

[0001] The present invention relates to a burner.

Background Art

[0002] Conventionally, a burner including a combustion part that forms a planar combustion surface and a rod that performs at least one of ignition and combustion state detection for the combustion part is known (see, for example, Patent Document 1). Patent Document 1 discloses a burner in which an ignition electrode rod and a frame rod as rods are attached in parallel to a flame port surface as a combustion surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The rod includes a cylindrical rod body and a rod-shaped rod electrode inserted into the rod body. In the structure of a conventional burner such as Patent Document 1, there is a possibility that a problem may occur in the rod body due to the heat of the combustion part.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a burner capable of reducing the possibility of problems due to heat occurring in the rod body.

Means for Solving the Problems

[0006] A burner according to one embodiment includes a combustion section that forms a planar combustion surface, a space forming section provided below the combustion section with the direction perpendicular to the combustion surface being the vertical direction, one side in the vertical direction being the upper side and the other side being the lower side, having an opening at the top that is closed by the combustion section, and closed at the bottom and on the sides perpendicular to the vertical direction, forming a space into which a mixture of fuel gas and air supplied to the combustion surface is introduced, and a flange that extends laterally perpendicular to the vertical direction from the upper end of the space forming section and supports the outer circumference of the combustion section, and a burner body including the flange, and at least for detecting ignition and combustion state of the combustion section. The apparatus comprises a rod for performing one of the following: the rod includes a cylindrical rod body and a rod-shaped rod electrode inserted into the rod body for performing ignition or detection, wherein the rod body has an axial direction oriented in the vertical direction and is supported by the flange on the lower side of the flange, and the rod electrode includes a first portion extending in the axial direction of the rod body, projecting upward from the rod body to a position above the flange, and a second portion extending from the portion of the first portion located above the flange to a position facing the combustion surface in a direction intersecting the direction in which the first portion extends.

[0007] According to this design, the tip of the rod electrode, i.e., the second portion of the rod electrode, is located above the flange, while the rod body is located below the flange, on the opposite side in the vertical direction from where the second portion is located. This allows the rod body to be separated from the upper side of the combustion surface where ignition or combustion state detection takes place, thereby reducing the possibility of heat-related malfunctions in the rod body. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view of a cooking appliance seen from the side. [Figure 2] This is a plan view of the burner from above. [Figure 3] This is a side view of the burner, seen from the side. [Figure 4]This is a cross-sectional view of the burner along the line IV-IV in Figure 2. [Figure 5] This is a perspective view of the rod unit. [Figure 6] This is a side view of the rod unit. [Figure 7] This is a plan view of the rod unit. [Figure 8] This is a cross-sectional view of the rod unit along the line VIII-VIII in Figure 6. [Figure 9] This diagram illustrates the procedure for removing the rod unit from the burner body. Figure 9A shows the rod unit tilted at an angle, and Figure 9B shows the rod unit moved downwards from the state shown in Figure 9A. [Modes for carrying out the invention]

[0009] Here, embodiments of the present invention will be described in the following order. (1) Configuration of the heating appliance: (2) Burner configuration: (2-1) Combustion section configuration: (2-2) Components of the burner body: (2-3) Rod unit configuration: (3) How to attach and detach the rod: (4) Effects: (5) Other embodiments:

[0010] (1) Configuration of the heating appliance: Figure 1 shows a cross-sectional view of the heating appliance of this embodiment, viewed from the side. Note that in Figure 1, for clarity, the various parts of the heating appliance 1, such as the burner 5, are simplified. The actual shape of the burner 5 is shown in Figures 2 and below. The heating appliance 1 in Figure 1 is, for example, a commercial noodle boiler or fryer. The heating appliance 1 comprises an outer case 2, an inner case 3, a tank 4, and a burner 5. Hereinafter, the direction perpendicular to the combustion surface 122 of the burner 5 is referred to as the vertical direction, with one side in the vertical direction being the upper side and the other side being the lower side. Specifically, the direction from the burner 5 to the tank 4 in the vertical direction is considered upward, and the opposite direction is considered downward. The direction perpendicular to the vertical direction is referred to as the lateral or horizontal direction.

[0011] The outer case 2 forms an open-topped storage space inside for housing the various parts that constitute the heating appliance 1. The outer case 2 includes a bottom portion 2a and a side portion 2b extending upward from the end of the bottom portion 2a. The bottom portion 2a and the side portion 2b are plate-shaped. The outer case 2 is provided such that the bottom portion 2a is located on the lower side in the vertical direction and the opening is located on the upper side in the vertical direction. Multiple legs 2g are attached to the bottom portion 2a. Each leg 2g contacts the floor where the heating appliance 1 is installed. In this embodiment, the bottom portion 2a is open. The side portion 2b is the part that closes the side of the storage space perpendicular to the vertical direction. The side portion 2b includes a front portion 2c, a rear portion 2d, a right side portion (not shown), and a left side portion (not shown). The front section 2c is located on the side where the worker is positioned when removing or attaching the rod unit 50 (described later) to the burner 5. The front section 2c has an opening 2e facing the storage space inside the outer case 2. The opening 2e faces at least the lower part of the storage space of the outer case 2 where the burner 5 and the like are located. The worker can perform work on the burner 5 and the like through the opening 2e. The front section 2c includes an opening / closing section 2f for opening and closing the opening 2e. During normal use of the cooking appliance 1, the opening 2e is closed by the opening / closing section 2f. The rear section 2d is located on the opposite side of the front section 2c, with the storage space of the outer case 2 in between. The rear section 2d faces, for example, the wall where the cooking appliance 1 is installed. The right side is located on the right side when viewed from the front section 2c. The left side is located on the left side when viewed from the front section 2c.

[0012] The inner case 3 is installed inside the outer case 2. The inner case 3 is a component that houses the tank 4 and supports the burner 5. The inner case 3 is installed so as to fit into the upper opening of the outer case 2. The inner case 3 forms an open-topped housing space. The inner case 3 includes a lower surface portion 3a and a side portion 3b that extends upward from the end of the lower surface portion 3a. The lower surface portion 3a supports the burner 5. Specifically, the lower surface portion 3a has an opening that penetrates vertically. The lower surface portion 3a supports the burner 5 such that its opening is closed by the flange 15 and combustion section 8, which constitute the upper surface of the burner 5 (described later). An exhaust port 3c is formed in the side portion 3b.

[0013] The groove 4 is provided in the accommodation space inside the inner case 3. The groove 4 forms an inner space with an upper opening. Water for boiling noodles or oil for frying fried foods is put into the inner space of the groove 4.

[0014] The burner 5 is a device for heating the liquid (water or oil) put into the groove 4. The burner 5 is a gas burner that performs combustion with a mixed gas of fuel gas and air. The burner 5 burns the mixed gas of fuel gas and air at the combustion surface 122. Then, the burner 5 heats the groove 4 by the radiant heat and heat flow (or combustion gas) generated by the combustion of the combustion surface 122 in the combustion chamber 100, which is the space between the groove 4 and the inner case 3. The combustion chamber 100 is provided so as to surround the lower and side portions of the groove 4. The burner 5 is supported by the inner case 3 inside the outer case 2. Specifically, the burner 5 is supported by the lower surface portion 3a of the inner case 3 such that the combustion part 8 where combustion occurs is exposed to the combustion chamber 100. More specifically, the burner 5 is provided such that the combustion part 8 constitutes at least a part of the lower surface portion 3a. The combustion part 8 faces the lower surface portion of the groove 4. The details of the burner 5 will be described later. The heat flow or combustion gas generated in the combustion chamber 100 is discharged from the exhaust port 3c.

[0015] The cooking heater 1 includes members such as a pipe 6 that guides air and fuel gas to the burner 5, and a fan 7 that supplies air to the burner 5. The pipe 6 includes an air pipe through which the air sent from the fan 7 flows, a gas pipe through which the fuel gas supplied from the outside flows, and a mixed gas pipe through which the mixed gas of the air in the air pipe and the fuel gas in the gas pipe flows. Members such as the pipe 6 and the fan 7 are provided, for example, in the inner space of the outer case 2, below the inner case 3, more specifically, below the burner 5.

[0016] (2) Structure of the burner: (2-1) Structure of the combustion part: Next, the detailed configuration of the burner 5 will be described. As shown in FIGS. 2 to 4, the burner 5 includes a combustion section 8, a burner body 9, and a rod unit 50. The combustion section 8 is formed in a plate shape. The combustion section 8 includes a permeable body 12 through which a mixed gas of fuel gas and air permeates, and a support plate 13 that supports the permeable body 12 from below. The combustion section 8 is a laminate of the permeable body 12 and the support plate 13. The permeable body 12 is configured in a sheet shape woven with heat-resistant fibers such as metal fibers, for example. The permeable body 12 may be composed of a porous sintered body. The permeable body 12 is square when viewed in plan in FIG. 2. The upper surface of the permeable body 12 is exposed to the combustion chamber 100.

[0017] The permeable body 12 is fixed to the upper surface of the support plate 13, for example, by welding. In FIG. 2, the welded portions of the permeable body 12 welded to the support plate 13 are indicated by reference numerals "121" and "123". That is, the permeable body 12 includes a first welded portion 121 and a second welded portion 123. The first welded portion 121 is provided in a region between the frame lines A1 and A2 shown in FIG. 2. The second welded portion 123 is provided in a region between the frame lines A3 and A4 shown in FIG. 2. Note that the frame line A1 is a square line indicating the outer peripheral line of the support plate 13. The frame line A2 is a square line set within the region surrounded by the frame line A1. The frame line A3 is a square line set within the region surrounded by the frame line A2. The frame line A4 is a square line set within the region surrounded by the frame line A3. The first welded portion 121 is provided in a square frame shape along the frame line A1 which is the outer peripheral line of the permeable body 12. The second welded portion 123 is provided at a position closer to the center of the permeable body 12 when viewed in plan in FIG. 2 than the first welded portion 121, and is provided in a square frame shape.

[0018] The permeable body 12 includes a combustion surface 122 between the first welded portion 121 and the second welded portion 123. The combustion surface 122 is provided between frame line A2 and frame line A3. The combustion surface 122 is provided in the shape of a rectangular frame. In other words, the combustion surface 122 is provided in a shape that includes the outer circumference of the rectangle indicated by frame line A2 and the inner circumference of the rectangle indicated by frame line A3. The combustion surface 122 is the surface on which combustion by the mixed gas takes place. The combustion surface 122 is formed in a planar shape perpendicular to the vertical direction. The permeable body 12 also includes a central portion 124 which is the part enclosed by frame line A4.

[0019] The support plate 13 supports the entire lower surface of the permeator 12. A number of holes 131 (see Figure 4) are formed in a portion of the support plate 13, penetrating it vertically. The holes 131 are formed in the region facing the combustion surface 122. The holes 131 are for allowing the mixed gas supplied from below to pass upward. The upper surface of the combustion surface 122 is connected to the space 110 (see Figure 4), described later, into which the mixed gas is introduced, via the holes 131. In other words, the upper surface of the combustion surface 122 is a gas ejection surface from which the mixed gas is ejected via the holes 131. No holes for the mixed gas to pass through are formed in the region of the support plate 13 facing the central portion 124 of the permeator 12. In other words, the central portion 124 is not connected to the space 110 into which the mixed gas is introduced. The support plate 13 is fixed to the integrated flange 17 of the burner body 9, described later, by welding or the like.

[0020] (2-2) Components of the burner body: The burner body 9 includes a space-forming section 14, a flange 15, and a gas introduction section 16. The space-forming section 14 is located below the combustion section 8. The space-forming section 14 has an opening above which is closed by the combustion section 8, and forms a space 110 (see Figure 4) that is closed below and on the sides perpendicular to the vertical direction. The space 110 is the space into which the mixed gas is introduced. Specifically, the space-forming section 14 includes a bottom surface 141, a front surface 142, a back surface 143, a right side surface 144, and a left side surface 145. The bottom surface 141 is a plate-shaped portion that separates the space 110 from the space below it.

[0021] The front portion 142, rear portion 143, right side portion 144, and left side portion 145 are plate-shaped side portions that connect the bottom portion 141 to the flange 15 described later. The front portion 142 is a side portion provided on the side of the rod unit 50 described later. The front portion 142 is provided in a position that is horizontally opposite to the rod body 20 (see Figures 5, 6, and 8) described later. The front portion 142 is formed in a shape that moves away from the ignition rod 10 and detection rod 11 described later as it extends downwards, more specifically, in a shape that moves away from the rod body 20 described later. In other words, the front portion 142 is displaced towards the rear portion 143, which is a side portion located on the opposite side of the front portion 142 with the space 110 in between, as it extends downwards. Specifically, the front portion 142 includes a parallel portion 142a and an inclined portion 142b, as shown in Figure 4. The parallel portion 142a is connected to the inner circumference end of the integral flange 17, which will be described later, and extends parallel to the vertical direction. The inclined portion 142b is the part that connects the lower end of the parallel portion 142a to the end of the lower surface portion 141. The inclined portion 142b is inclined with respect to the vertical direction, that is, it is displaced toward the rear surface portion 143 as it is directed downwards. In this way, at least a part of the front surface portion 142 is configured as the inclined portion 142b.

[0022] The rear portion 143 is formed in a shape symmetrical to the front portion 142 with respect to a predetermined virtual plane (not shown) parallel to the vertical direction. That is, the rear portion 143 is displaced toward the front portion 142 as it extends downward. More specifically, as shown in Figure 4, the rear portion 143 includes a parallel portion 143a and an inclined portion 143b. The parallel portion 143a is connected to the inner circumferential end of the integral flange 17 (described later) and extends parallel to the vertical direction. The parallel portion 143a is symmetrical to the parallel portion 142a of the front portion 142 with respect to the above-mentioned virtual plane. The inclined portion 143b is the portion connecting the lower end of the parallel portion 143a and the end of the lower surface portion 141. The inclined portion 143b is inclined with respect to the vertical direction, that is, it is displaced toward the front portion 142 as it extends downward. The inclined portion 143b has a shape that is symmetrical to the inclined portion 142b of the front portion 142 with respect to the virtual surface.

[0023] As shown in Figure 3, the right side portion 144 is a side portion located on the right side when viewed from the front portion 142. The left side portion 145 is a side portion located on the left side when viewed from the front portion 142. The right side portion 144 and the left side portion 145 extend parallel to each other in the vertical direction. Note that the right side portion 144 and the left side portion 145 may also have an inclined shape with respect to the vertical direction.

[0024] The gas inlet 16 is the part that introduces the mixed gas into the space 110. The gas inlet 16 is cylindrical and connected to the bottom portion 141. The space 161 (see Figure 4) inside the gas inlet 16 leads to the space 110. The gas inlet 16 is also connected to the pipe 6. The mixed gas flowing through the pipe 6 is introduced into the space 110 via the gas inlet 16.

[0025] The flange 15 has a shape that protrudes laterally from the upper end of the space-forming portion 14, that is, from the upper ends of the front portion 142, the rear portion 143, the right side portion 144, and the left side portion 145. The flange 15 includes an integral flange 17 that is integrally provided with the space-forming portion 14, and a detachable flange 18 that is separate from the space-forming portion 14 and is detachably provided with the integral flange 17. The integral flange 17 includes a front flange that protrudes laterally from the upper end of the front portion 142, a rear flange that protrudes laterally from the upper end of the rear portion 143, a right flange that protrudes laterally from the upper end of the right side portion 144, and a left flange that protrudes laterally from the upper end of the left side portion 145. The front flange, rear flange, right flange, and left flange of the integral flange 17 are each fixed to the lower surface portion 3a of the inner case 3 by welding or bolts. The front flange, rear flange, right flange, and left flange of the integrated flange 17 support the outer periphery of the combustion section 8, specifically the outer periphery of the support plate 13. The front flange includes a notch 171 (see Figure 2). The notch 171 penetrates the front flange in the vertical direction. The notch 171 is shaped by cutting out a part of the outer edge of the front flange located at the tip in the direction of protrusion from the space-forming section 14, and is recessed from that outer edge toward the base side of the front flange.

[0026] The detachable flange 18 is provided at the position of the notch 171. The detachable flange 18 constitutes part of the rod unit 50 described later. The detachable flange 18 has an angle shape. Specifically, the detachable flange 18 includes a main body portion 181 and a reinforcing portion 182. The main body portion 181 is a plate-shaped portion that is fixed to the integral flange 17 and is the portion to which the ignition rod 10 and the detection rod 11 are fixed. In the plan view of Figure 2, at least a part of the main body portion 181 overlaps with the area inside the notch 171. The main body portion 181 is also provided below the front flange. The upper surface of the main body portion 181 is located below the combustion surface 122.

[0027] In the plan view of Figure 7, the width of the main body 181 in the direction in which the ignition rod 10 and the detection rod 11 are arranged is greater than the width in the direction perpendicular to that arrangement direction. That is, the main body 181 is formed with the arrangement direction of the ignition rod 10 and the detection rod 11 as the longitudinal direction, and the direction perpendicular to that arrangement direction, i.e., the direction in which the main body 181 protrudes from the space forming portion 14 as the short direction. In addition, at least a part of the main body 181 is exposed to the combustion chamber 100 side from the notch portion 171 of the integral flange 17 in the plan view of Figure 2. In this embodiment, most of the main body 181, specifically more than 50% of the main body 181, is exposed to the combustion chamber 100 side from the notch portion 171.

[0028] As shown in Figure 5, the main body 181 has a first hole 181a, a second hole 181b, and a third hole 181c that penetrate vertically. The first hole 181a is for inserting the first portion 251 of the ignition rod 10 and the insulating tube 27, which will be described later. The second hole 181b is for inserting the first portion 251 of the detection rod 11 and the insulating tube 27, which will be described later. The diameters of the first hole 181a and the second hole 181b are slightly larger than the outer diameter of the insulating tube 27. The third hole 181c is for inserting the grounding rod 29, which will be described later. The third hole 181c is located between the first hole 181a and the second hole 181b, at a position equidistant from the first hole 181a and the second hole 181b.

[0029] The main body portion 181 has an outer peripheral edge 181d (see Figures 2, 5, and 7) located on the front portion 142 side of the space forming portion 14 when the detachable flange 18 is attached to the integral flange 17. The outer peripheral edge 181d is the outer peripheral edge of the detachable flange 18 on the opposite side of the direction of protrusion from the space forming portion 14. The outer peripheral edge 181d is an outer peripheral edge that extends along the longitudinal direction of the main body portion 181. When viewed in plan view in Figures 2 and 7, the outer peripheral edge 181d extends linearly along the longitudinal direction of the front flange of the integral flange 17, that is, along a direction perpendicular to both the direction of protrusion of the front flange from the front portion 142 and the vertical direction. The main body portion 181 has a mounting hole 181f that is cut out from the outer peripheral edge 181d. As shown in Figure 7, the mounting hole 181f extends from the outer peripheral edge 181d to the outer peripheral edge 181e of the main body 181 on the side that protrudes from the space forming portion 14. The mounting hole 181f penetrates the main body 181 in the vertical direction. Two mounting holes 181f are provided spaced apart in the direction in which the outer peripheral edge 181d extends. Between the two mounting holes 181f, the first hole 181a, the second hole 181b, and the third hole 181c are provided as described above.

[0030] Each mounting hole 181f is for attaching the detachable flange 18 to the integral flange 17. That is, a fastener 19 (see Figures 2 to 4) consisting of a bolt and nut is provided in each mounting hole 181f, and the detachable flange 18 is attached to the integral flange 17 by this fastener 19. Specifically, the bolt of the fastener 19 is inserted into the mounting hole 181f, and the nut is fastened to the bolt from below the main body 181, thereby attaching the detachable flange 18 to the integral flange 17. The bolt of the fastener 19 is fixed to the integral flange 17, for example, by welding so that it protrudes downward.

[0031] As shown in Figure 5, the reinforcing portion 182 protrudes downward from the outer peripheral edge 181e of the detachable flange 18 on the side extending outward from the space-forming portion 14. The reinforcing portion 182 is provided over the entire range of the outer peripheral edge 181e, that is, the entire range along the longitudinal direction of the main body portion 181. The angle between the reinforcing portion 182 and the main body portion 181 is a right angle. The detachable flange 18 is formed in a substantially L-shape by the main body portion 181 and the reinforcing portion 182.

[0032] (2-3) Rod unit configuration: The rod unit 50 shown in Figures 5 to 8 is detachably mounted on the burner body 9. The rod unit 50 includes the aforementioned detachable flange 18, an ignition rod 10, a detection rod 11, and a grounding rod 29. The ignition rod 10 is the component that ignites the combustion section 8. That is, the ignition rod 10 ignites the mixed gas ejected from the combustion surface 122. The detection rod 11 is the component that detects the combustion state of the combustion section 8. The ignition rod 10 and the detection rod 11 are positioned to overlap with the area within the notch 171 of the integral flange 17 when viewed in plan in Figure 2.

[0033] The ignition rod 10 and the detection rod 11 have equivalent structures. Specifically, the ignition rod 10 and the detection rod 11 include a cylindrical rod body 20, a rod-shaped rod electrode 25 inserted into the rod body 20, and an insulating tube 27. The rod body 20 has its axial direction oriented vertically and is supported by the detachable flange 18, which forms part of the flange 15, on its lower side. In this embodiment, the rod body 20 of the ignition rod 10 and the rod body 20 of the detection rod 11 are provided at positions equidistant from the combustion surface 122 in the direction of protrusion from the space-forming portion 14 of the flange 15, but they may be provided at different distances from the combustion surface 122. Furthermore, the rod body 20 of the ignition rod 10 and the rod body 20 of the detection rod 11 are provided with a gap between them in a direction perpendicular to both the direction of protrusion from the space-forming portion 14 and the vertical direction of the flange 15, i.e., in the left-right direction in Figure 7.

[0034] The rod body 20 includes a cylindrical section 21, an insulator section 22, and a mounting section 23. The cylindrical section 21 is positioned so that its axial direction is vertical. The upper end of the cylindrical section 21 is fixed to the lower surface of the main body 181 by welding or the like. The outer circumference and inner circumference of the cross-section of the cylindrical section 21 perpendicular to the axial direction are both circular. That is, the cylindrical section 21 is cylindrical in shape. The outer and inner diameters of the cylindrical section 21 are constant along the axial direction. The lower end of the cylindrical section 21 abuts against the stepped section 232 (see Figure 8) of the mounting section 23, which will be described later.

[0035] The insulator portion 22 is a component that insulates the rod electrode 25 from a component such as a cylindrical portion 21 provided on its outside. The insulator portion 22 is made of an insulator such as ceramic. As shown in Figure 8, the insulator portion 22 has a linearly extending through hole 221 that penetrates from one side of the insulator portion 22 to the other side. The insulator portion 22 is provided coaxially with respect to the cylindrical portion 21. Specifically, the insulator portion 22 is provided such that the axis of the through hole 221 coincides with the axis of the cylindrical portion 21. In this way, the insulator portion 22 is provided so that its axial direction is in the vertical direction. A portion from the upper end and a portion from the lower end of the through hole 221 are large-diameter holes 221a and 221b, which are larger in diameter than the other parts of the through hole 221. Adhesive 222 is provided in the large-diameter hole 221b on the lower end side. The insulator portion 22 and the first portion 251 of the rod electrode 25 (described later) are fixed together by adhesive 222. The insulator portion 22 is formed to have a smaller diameter than the inner diameter of the cylindrical portion 21. A portion of the insulator portion 22 from the upper end is inserted into the cylindrical portion 21 from the lower end side. A portion of the insulator portion 22 from the lower end protrudes downward from the cylindrical portion 21. The cross-section of the insulator portion 22 perpendicular to the axial direction is circular. The insulator portion 22 is attached to the cylindrical portion 21 by mounting portion 23.

[0036] The mounting portion 23 is cylindrical. One axial end of the mounting portion 23 is inserted into the cylindrical portion 21 from the lower end. For example, a screw groove is formed on the outer circumferential surface of the portion of the mounting portion 23 that is inserted into the cylindrical portion 21, and a screw groove is also formed on the inner circumferential surface of the lower end of the cylindrical portion 21. The mounting portion 23 is attached to the cylindrical portion 21 by screwing these screw grooves together. Alternatively, the mounting portion 23 may be attached to the cylindrical portion 21 by press-fitting it into the cylindrical portion 21.

[0037] The other axial end of the mounting portion 23 protrudes downward from the lower end of the cylindrical portion 21. The cross-section of the portion of the mounting portion 23 that protrudes from the lower end of the cylindrical portion 21, perpendicular to the axial direction of the mounting portion 23, is, for example, a regular polygon (for example, a regular hexagon). The insulator portion 22 is inserted through the through hole on the inside of the mounting portion 23. Adhesive 231 is provided between the inner circumferential surface of the mounting portion 23 and the outer circumferential surface of the insulator portion 22. The adhesive 231 prevents the insulator portion 22 from coming out of the mounting portion 23.

[0038] The distance d5 (see Figure 8) between the stepped portion 232, which is the upper end of the portion of the mounting portion 23 that is exposed from the cylindrical portion 21, and the lower surface of the main body portion 181 of the detachable flange 18 is greater than the distance d2 (see Figure 6) between the second portion 252 of the ignition rod 10 and the upper surface of the main body portion 181, and the distance d3 (see Figure 6) between the second portion 252 of the detection rod 11 and the upper surface of the main body portion 181. The distance d5 is preferably at least twice the distances d2 and d3, and more preferably at least three times the distances d2 and d3. The distance d5 is set to, for example, 60 mm to 100 mm. This allows the insulator portion 22 to be kept away from the combustion surface 122 and the combustion chamber 100, thereby suppressing burnout of the insulator portion 22.

[0039] The rod electrode 25 includes a linearly extending first portion 251, a linearly extending second portion 252 in a direction intersecting the direction in which the first portion 251 extends, and a joint 253 connecting the first portion 251 and the second portion 252. The first portion 251 is rod-shaped and made of a conductive material (e.g., steel). The first portion 251 extends axially, i.e., vertically, of the rod body 20. The first portion 251 is inserted into the inside of the cylindrical portion 21 and into the through hole 221 of the insulator portion 22. The first portion 251 protrudes upward from the upper end of the cylindrical portion 21. The first portion 251 protrudes downward from the lower end of the insulator portion 22. In this way, the first portion 251 is provided to protrude vertically from both ends of the rod body 20 in the axial direction.

[0040] The first portion 251 is located within the notch 171 of the integral flange 17, as seen in the plan view of Figure 2. The first portion 251 of the ignition rod 10 protrudes above the detachable flange 18 through the first hole 181a (see Figure 5) of the detachable flange 18. The first portion 251 of the detection rod 11 protrudes above the detachable flange 18 through the second hole 181b (see Figure 5) of the detachable flange 18. Each of the first portions 251 of the ignition rod 10 and the detection rod 11 further protrudes above the integral flange 17 through the notch 171. In this way, the first portion 251 protrudes upward from the rod body 20 and extends to a position above the integral flange 17. The portion of the first portion 251 that protrudes above the integral flange 17 is inserted into the first mounting hole 253a (see Figure 6) of the joint 253. A terminal 254 is attached to the portion of the first part 251 that protrudes downward from the insulator portion 22. The terminal 254 is a component for inputting current to the rod electrode 25 or outputting current from the rod electrode 25.

[0041] The second part 252 is a separate component from the first part 251. The second part 252 is located above the combustion section 8. The second part 252 extends from the portion of the first part 251 located above the flange 15 to a position facing the combustion surface 122 in a direction intersecting the direction in which the first part 251 extends. That is, in a plan view in Figure 7, the second part 252 extends from a position overlapping the main body 181 of the detachable flange 18 to a position beyond the outer peripheral edge 181d where the mounting hole 181f is formed. The tip of the second part 252 faces the combustion surface 122 with a gap in the vertical direction. The second part 252 is rod-shaped and made of a conductive material (e.g., steel). The second part 252 extends in a direction perpendicular to the direction in which the first part 251 extends, i.e., horizontally.

[0042] The second portion 252 is inserted through a second mounting hole 253b (see Figure 7) formed in the joint 253 and is attached to the joint 253 so as not to come out of the second mounting hole 253b. In this embodiment, the direction in which the second portion 252 of the ignition rod 10 extends and the direction in which the second portion 252 of the detection rod 11 extends are parallel, but they may be non-parallel. Also, in this embodiment, the second portion 252 of the ignition rod 10 is located above the second portion 252 of the detection rod 11. However, it is not limited to this, and the second portion 252 of the ignition rod 10 may be provided at the same position as the second portion 252 of the detection rod 11 in the vertical direction, or it may be provided below the second portion 252 of the detection rod 11.

[0043] The joint 253 is formed of a conductive material (e.g., steel). The joint 253 is positioned to overlap the area within the notch 171 when viewed in plan in Figure 2. The joint 253 is positioned above the flange 15 and the combustion section 8. The joint 253 includes a first mounting hole 253a through which the first portion 251 is inserted, and a second mounting hole 253b through which the second portion 252 is inserted (see Figures 6 and 7). The first mounting hole 253a and the second mounting hole 253b penetrate the joint 253 in directions perpendicular to each other. Specifically, the first mounting hole 253a penetrates the joint 253 in the vertical direction. The second mounting hole 253b penetrates the joint 253 in a direction perpendicular to the vertical direction. The joint 253 includes a first tightening portion 253c (see Figure 7) that tightens the first portion 251 inserted through the first mounting hole 253a. The first tightening portion 253c prevents the first portion 251 from coming out of the first mounting hole 253a, that is, the joint 253 is fixed to the first portion 251. The joint 253 also includes a second tightening portion 253d (see Figure 7) that tightens the second portion 252 inserted through the second mounting hole 253b. The second tightening portion 253d prevents the second portion 252 from coming out of the second mounting hole 253b, that is, the second portion 252 is fixed to the joint 253. In this way, the first portion 251 and the second portion 252 are connected via the joint 253.

[0044] The rod electrode 25 of the ignition rod 10 ignites the mixed gas ejected from the combustion surface 122. That is, a high current is input from the terminal 254 of the rod electrode 25. The high current input from terminal 254 flows through the first part 251, the joint 253, and the second part 252, generating a spark from the tip of the second part 252. This spark ignites the mixed gas. The rod electrode 25 of the detection rod 11 detects the combustion state of the combustion section 8. That is, a current corresponding to the combustion state flows through the second part 252, the joint 253, and the first part 251 of the detection rod 11 and is output from terminal 254.

[0045] The insulating tube 27 is made of an insulating material such as ceramic. The insulating tube 27 has a first portion 251 inserted into it and covers at least a portion of the perimeter of the first portion 251. One axial end of the insulating tube 27 protrudes upward from the rod body 20. Furthermore, the axial end of the insulating tube 27 extends through the first hole 181a or the second hole 181b of the detachable flange 18 and the notch 171 of the integral flange 17 to a position above the integral flange 17 and below the joint 253. The other axial end of the insulating tube 27 is inserted into the large-diameter hole 221a (see Figure 8) of the insulator portion 22 within the cylindrical portion 21.

[0046] The grounding rod 29 is made of a conductive material (for example, steel). The grounding rod 29 is supported by the main body portion 181 of the detachable flange 18 at a position between the ignition rod 10 and the detection rod 11. The grounding rod 29 is grounded by being connected to the detachable flange 18. Specifically, the space forming portion 14 and the integral flange 17 of the burner body 9 are grounded, and the detachable flange 18 is fixed to the grounded integral flange 17, thereby grounding the detachable flange 18 and the grounding rod 29 fixed to it. The grounding rod 29 has a roughly L-shape. Specifically, as shown in Figures 5 to 7, the grounding rod 29 includes a vertical portion 291 extending in the vertical direction, an intersecting portion 292 extending in a direction intersecting the vertical direction, and a bent portion 293 connecting the vertical portion 291 and the intersecting portion 292. The vertical portion 291, the intersecting portion 292, and the bent portion 293 are made of the same rod-shaped material. The vertical portion 291 is inserted into the third hole 181c of the main body 181. The vertical portion 291 is fixed to the lower surface of the main body 181 with a nut or the like. The vertical portion 291 extends upward from the main body 181, passes through the notch 171 of the integral flange 17, and extends to a position above the integral flange 17.

[0047] The intersecting portion 292 extends horizontally at a position above the integral flange 17. The direction in which the intersecting portion 292 extends is non-parallel to the direction in which the ignition rod 10 and the second portion 252 of the detection rod 11 extend. Specifically, as the intersecting portion 292 moves from the bent portion 293 toward the outer peripheral edge 181d of the main body portion 181 where the notched mounting hole 181f is formed, in other words toward the combustion surface 122, it approaches the second portion 252 of the ignition rod 10. In the plan view of Figure 2, at least a portion of the intersecting portion 292 overlaps the combustion surface 122. The tip of the intersecting portion 292 is located at the same vertical position as the tip of the second portion 252 of the ignition rod 10, or slightly below the second portion 252.

[0048] The distance d1 (see Figure 7) between the second portion 252 and the intersecting portion 292 of the ignition rod 10 is shorter than the distance d2 (see Figure 6) between the second portion 252 and the upper surface of the main body 181. Also, distance d1 is shorter than the distance d3 (see Figure 6) between the second portion 252 of the detection rod 11 and the upper surface of the main body 181. Note that distance d1 is the shortest distance between the tip of the second portion 252 of the ignition rod 10 and the intersecting portion 292. Distance d2 is the shortest distance between the tip of the second portion 252 of the ignition rod 10 and the upper surface of the main body 181. Distance d3 is the shortest distance between the tip of the second portion 252 of the detection rod 11 and the upper surface of the main body 181. Distance d1 is shorter than the distance d4 (see Figure 4) between the second portion 252 of the ignition rod 10 and the combustion surface 122. Distance d4 is the shortest distance between the tip of the second portion 252 of the ignition rod 10 and the combustion surface 122. Distance d1 is shorter than the distance between the second portion 252 of the ignition rod 10 and the second portion 252 of the detection rod 11. Distance d1 is shorter than the distance between the intersecting portion 292 and the second portion 252 of the detection rod 11. Distance d1 is set to, for example, less than 10 mm, and more specifically, less than 5 mm and 1 mm or more. Distances d2, d3, and d4 are set to, for example, 10 mm or more and 30 mm or less.

[0049] The above describes the configuration of burner 5. In burner 5, the mixed gas is introduced into the space 110 inside the burner body 9 via the pipe 6 and the gas inlet 16. The mixed gas introduced into space 110 is ejected near the combustion surface 122 through the hole 131 in the support plate 13. The ejected mixed gas is ignited by the ignition rod 10, causing full primary combustion to occur at the combustion surface 122.

[0050] (3) How to attach and detach the rod: Next, the method for attaching and detaching the ignition rod 10 and the detection rod 11 to the burner body 9 will be explained. The ignition rod 10 and the detection rod 11 are attached and detached to the burner body 9 as a rod unit 50. First, the method for removing the rod unit 50 from the burner body 9 will be explained. The worker opens the opening 2f of the outer case 2 to expose the opening 2e. Next, the worker reaches into the outer case 2 through the opening 2e and releases the fastener 19 that secures the detachment flange 18. That is, removes the nut from the bolt of the fastener 19. Next, the worker rotates the rod unit 50 in the direction indicated by arrow C1, as shown in Figure 9A, so that the axis L of the rod body 20 is tilted diagonally with respect to the vertical direction. In the state shown in Figure 9A, the axis L is located on the right side of Figure 9A, that is, on the side of the rear part 2d (see Figure 1) of the outer case 2, as it goes downwards. In other words, the axis L in the state shown in Figure 9A is located further to the left of Figure 9A, that is, towards the opening 2e of the outer case 2, as it moves upward. Also, in the state shown in Figure 9A, the tip of the rod electrode 25 and the tip of the ground rod 29 are located closer to the opening 2e than the edge line on the rearmost side 2d of the notch 171 of the integrated flange 17. That is, in a plan view, the tips of the rod electrode 25 and the tips of the ground rod 29 overlap the area within the notch 171.

[0051] Next, the worker moves the rod unit 50 from the state shown in Figure 9A in the direction indicated by arrow C2, i.e., downward, to the state shown in Figure 9B. That is, the worker moves the portions of the rod electrode 25 and the ground rod 29 above the integral flange 17 through the notch 171 to below the integral flange 17. The worker also removes the bolt of the fastener 19 from the mounting hole 181f of the detachable flange 18. In this case, the bolt of the fastener 19 is removed from the mounting hole 181f, for example, by passing through the notch of the mounting hole 181f. In the state shown in Figure 9B, the entire rod unit 50 is positioned below the integral flange 17. After that, the worker moves the rod unit 50 from the state shown in Figure 9B in the direction indicated by arrow C3, i.e., towards the worker, and removes it from the outer case 2 through the opening 2e.

[0052] When attaching the rod unit 50 to the burner body 9, the worker should follow the reverse procedure of removing the rod unit 50 from the burner body 9. That is, the worker should place the rod unit 50 into the outer case 2 through the opening 2e to the state shown in Figure 9B, then move it upward to the state shown in Figure 9A, and then rotate it so that the axis L of the rod body 20 is facing up and down. At this time, the worker should adjust the position of the rod unit 50 so that the bolt of the fastener 19 enters the mounting hole 181f of the detachable flange 18 through the notched portion of the mounting hole 181f. After that, the worker should fasten the detachable flange 18 to the integral flange 17 by fastening the nut to the bolt of the fastener 19.

[0053] (4) Effects The effects of this embodiment will now be explained. The second portion 252, which is the tip side of the rod electrode 25, and the combustion chamber 100 are provided above the flange 15, while the rod body 20 is provided below the flange 15. This allows the rod body 20 to be separated from the upper region of the combustion surface 122 where ignition or combustion state detection takes place, thereby reducing heat transfer from the combustion chamber 100 to the rod body 20. This reduces the possibility of malfunctions occurring in the rod body 20 due to the heat of the combustion chamber 100. Specifically, it reduces the possibility of deterioration of the adhesive 222 (see Figure 8) that fixes the insulator portion 22 and the rod electrode 25 due to heat. This reduces the possibility of the rod electrode 25 becoming loose, rotating, or deforming. It also reduces the possibility of deterioration of the adhesive 231 (see Figure 8) that fixes the insulator portion 22 and the mounting portion 23. This reduces the possibility of the insulator portion 22 becoming loose. Furthermore, the heat can reduce the possibility of dielectric breakdown occurring in the insulator portion 22 due to deterioration of the glaze. This reduces the possibility of a decrease in the flame detection capability of the detection rod 11.

[0054] Since the first part 251 and the second part 252 of the rod electrode 25 are separate components and are connected by a joint 253, the possibility of deformation of the rod electrode 25 due to residual stress can be reduced. In other words, the possibility of the position of the tip of the second part 252 changing due to the influence of heat from the combustion chamber 100 can be reduced. This reduces the possibility of abnormal ignition or detection of abnormal combustion conditions. Furthermore, since the first part 251 and the second part 252 are detachable from the joint 253, even if the first part 251 or the second part 252 is burnt out, it is easy to replace the first part 251 or the second part 252. In contrast, in the case of a rod electrode formed into an L-shape by bending, the angle between the first part and the second part may change due to residual stress in the bent portion.

[0055] Since the detachable flange 18 has an angle shape, deformation of the detachable flange 18 due to the heat of combustion can be suppressed. Specifically, since the reinforcing portion 182 of the detachable flange 18 is provided along the longitudinal direction of the main body portion 181, it is possible to suppress the main body portion 181 from bending in an arc shape in the vertical direction along the longitudinal direction.

[0056] Since an earth rod 29 is provided between the second portion 252 of the ignition rod 10 and the second portion 252 of the detection rod 11, sparks generated from the second portion 252 of the ignition rod 10 can be prevented from reaching the second portion 252 of the detection rod 11. In other words, electric shock from the ignition rod 10 to the detection rod 11 can be suppressed. In addition, by providing the earth rod 29 between the ignition rod 10 and the detection rod 11, it is possible to prevent the detachable flange 18 and the rod unit 50 from becoming larger. The distance d1 between the second portion 252 of the ignition rod 10 and the earth rod 29 is shorter than the distance d4 between the second portion 252 and the combustion surface 122. This suppresses electric shock from the ignition rod 10 to the combustion surface 122. In particular, if the combustion surface 122 is made of metal fibers, it is possible to prevent the metal fibers from being burned by sparks from the ignition rod 10.

[0057] The rod unit 50 can be attached to the burner body 9 from below. The rod unit 50 can be removed from the burner body 9 downwards. The front portion 142 (inclined portion 142b), which is the side portion of the burner body 9 that faces the rod unit 50, is formed in a shape that moves away from the rod unit 50 when it is attached to the burner body 9 as it extends downwards. As a result, as shown in Figures 9A and 9B, interference between the rod unit 50 and the front portion 142 during the attachment and detachment of the rod unit 50 can be suppressed, and the ease of attachment and detachment of the rod unit 50 can be improved.

[0058] The rear portion 143 of the burner body 9 is formed in a shape symmetrical to the front portion 142, and specifically, similar to the front portion 142, it includes a parallel portion 143a extending parallel to the vertical direction and an inclined portion 143b inclined with respect to the vertical direction. This improves the uniformity of the supply of mixed gas from the space 110 inside the burner body 9 between the combustion surface 122 located on the front portion 142 side and the combustion surface 122 located on the rear portion 143 side. As a result, the uniformity of combustion between regions of the combustion surface 122 can be improved.

[0059] The mounting hole 181f of the detachable flange 18 is cut out from the outer peripheral edge 181d of the detachable flange 18 on the opposite side of the direction of protrusion from the space-forming portion 14. This makes it easier to insert and remove the bolt of the fastener 19 into the mounting hole 181f when attaching or detaching the rod unit 50. In other words, the ease of attaching and detaching the rod unit 50 can be improved.

[0060] (5) Other embodiments: The burner of this disclosure is not limited to the embodiments described above, and various modifications are possible. For example, the above embodiments illustrate a combustion section that forms a frame-shaped combustion surface in a plan view. However, the invention is not limited to this, and a combustion section that forms a planar combustion surface other than a frame shape may be applied. Also, in the above embodiments, an example was shown in which the vertical direction perpendicular to the combustion surface and the axial direction of the rod body are oriented vertically, but they may be oriented in directions other than vertical. That is, the direction perpendicular to the combustion surface and the axial direction of the rod body may be inclined obliquely with respect to the vertical.

[0061] Furthermore, the rod is supported by the flange and only needs to perform at least one of ignition of the combustion chamber and detection of the combustion state. For example, the ignition rod or the detection rod may be directly attached to an integral flange provided integrally with the space forming section. This also reduces the possibility of thermal malfunction of the rod body by positioning the rod body below the integral flange. The ignition rod and the detection rod may have different structures from each other. For example, one of the ignition rod and the detection rod does not need to satisfy the following configuration. "The rod includes a cylindrical rod body and a rod-shaped rod electrode inserted into the rod body for ignition or detection, wherein the rod body has an axial direction oriented in the vertical direction and is supported by the flange on the lower side of the flange, and the rod electrode includes a first portion extending in the axial direction of the rod body, projecting upward from the rod body to a position above the flange, and a second portion extending from the portion of the first portion located above the flange to a position facing the combustion surface in a direction intersecting the direction in which the first portion extends."

[0062] The rod electrode may include a first portion that extends axially from the rod body, protruding upward from the rod body to a position above the flange, and a second portion that extends from the portion of the first portion above the flange in a direction intersecting the direction in which the first portion extends, to a position facing the combustion surface. The first and second portions of the rod electrode may be provided as a single, bent component. The angle between the first and second portions may be an angle other than 90°.

[0063] The space-forming section should have an opening at the top that is closed by the combustion section, and closed at the bottom and on the sides perpendicular to the vertical direction, forming a space into which a mixture of fuel gas and air supplied to the combustion surface is introduced. The space-forming section can have any shape as long as this space can be formed. For example, the side of the space-forming section on the rod side does not have to be formed in a shape that moves away from the rod as it goes downwards, and may consist only of a portion parallel to the vertical direction.

[0064] If a suitable location can be secured for the grounding rod, it does not need to be placed between the ignition rod and the detection rod. For example, the grounding rod may be placed on the opposite side of where the detection rod is located, relative to the ignition rod, in the direction in which the ignition rod and detection rod are arranged.

[0065] Furthermore, the burner of this disclosure may be configured as follows: Combustion section and The system includes a rod that performs at least one of ignition of the combustion section and detection of the combustion state, The aforementioned rod is A cylindrical rod body, The rod body includes a rod-shaped rod electrode for ignition or detection, which is inserted into the rod body, The aforementioned rod electrode is A first portion extending in the axial direction of the rod body and protruding from the rod body, The first portion includes a second portion that extends from the portion of the rod body that protrudes from the rod body to a position that approaches the combustion surface in a direction intersecting the direction in which the first portion extends, The first part and the second part are separate components. The rod includes a joint connecting the first portion and the second portion. Burner.

[0066] Furthermore, the rod electrode of this disclosure may be configured as follows. A rod electrode applied to a burner, which performs at least one of ignition and combustion state detection, The first part extends in a straight line, A second part which is a separate component from the first part and extends linearly in a direction intersecting the direction in which the second member extends, and which constitutes the tip side of the rod electrode, A joint connecting the first part and the second part, A rod electrode equipped with a rod electrode.

[0067] These burners and rod electrodes have the advantage of suppressing deformation of the rod electrodes and allowing for easy replacement of the first or second part. [Explanation of Symbols]

[0068] 1...Cooker, 2...Outer case, 3...Inner case, 4...Tank, 5...Burner, 6...Tube, 7...Fan, 8...Combustion section, 9...Burner body, 10...Ignition rod, 11...Detection rod, 12...Permeator, 122...Combustion surface, 13...Support plate, 14...Space forming section, 142...Front section, 15...Flange, 16...Gas introduction section, 17...Integrated flange, 18...Detachable flange, 181...Main body section, 181f...Mounting hole, 182...Reinforcement section, 20...Rod body, 21...Cylinder section, 22...Insulator section, 23...Mounting section, 25...Rod electrode, 251...First section, 252...Second section, 253...Joint, 27...Insulating tube, 29...Grounding rod, 50...Rod unit

Claims

1. A combustion section that forms a flat combustion surface, The direction perpendicular to the combustion surface is defined as the vertical direction, with one side in the vertical direction being the upper side and the other side being the lower side. A space forming section is provided below the combustion section, has an opening above which is closed by the combustion section, and is closed below and on the sides perpendicular to the vertical direction, forming a space into which a mixed gas of fuel gas and air supplied to the combustion surface is introduced. The shape extends laterally perpendicular to the vertical direction from the upper end of the space forming portion, and includes a flange that supports the outer periphery of the combustion portion, The burner body, including, A rod supported by the flange, which performs at least one of ignition of the combustion section and detection of the combustion state, Equipped with, The aforementioned rod is A cylindrical rod body, The rod body includes a rod-shaped rod electrode for ignition or detection, which is inserted into the rod body, The rod body is supported by the flange on the lower side of the flange, with the axial direction of the rod body facing the vertical direction. The aforementioned rod electrode is A first portion extending in the axial direction of the rod body, projecting upward from the rod body, and extending to a position above the flange, The first portion includes a second portion that extends from a portion of the first portion located above the flange to a position facing the combustion surface in a direction intersecting the direction in which the first portion extends, The flange mentioned above is An integral flange provided integrally with the space forming portion, It includes a detachable flange, which is separate from the space-forming portion and is detachably provided on the integral flange, The aforementioned integrated flange includes a notch, The aforementioned notch is shaped by cutting out a portion of the outer edge of the integral flange, which extends through the integral flange in the vertical direction and is located at the tip of the integral flange in the direction of protrusion from the space-forming portion. When viewed from above, a portion of the detachable flange overlaps the area inside the notch. The detachable flange is attached to the integral flange by fasteners in the portion that does not overlap the notch. The rod body is supported by the detachable flange, Burner.

2. The first part and the second part are separate components. The rod includes a joint made of a conductive material that connects the first portion and the second portion. The first and second parts are detachably attached to the joint. The burner according to claim 1.

3. The aforementioned detachable flange has an angle shape. The aforementioned detachable flange is A plate-shaped main body portion fixed to the aforementioned integrated flange, The main body portion has a reinforcing portion that extends over the entire range of the outer peripheral edge on the side facing the protrusion direction from the space-forming portion and protrudes downward from the outer peripheral edge, The burner according to claim 1 or 2.

4. The rod includes an ignition rod that performs ignition and a detection rod that performs detection. The ignition rod and the detection rod are supported by the detachable flange. The detachable flange is provided with an earth rod supported at a position between the ignition rod and the detection rod, The distance between the grounding rod and the second portion of the ignition rod is shorter than the distance between the second portion of the ignition rod and the combustion surface. The burner according to claim 1 or 2.

5. The space-forming portion includes a lower surface portion and a side surface portion connecting the lower surface portion and the flange, The side portion located on the side of the rod and the detachable flange is formed in a shape that moves away from the rod as it extends downward. The burner according to claim 1 or 2.

6. The detachable flange has a mounting hole cut out from the outer peripheral edge of the detachable flange on the side opposite to the direction of protrusion from the space-forming portion. A bolt of the fastener, which protrudes downward from the integrated flange, is inserted into the mounting hole. The nut of the fastener is fastened to the bolt from below. The burner according to claim 1 or 2.

7. The rod includes an insulating tube, The rod body includes a cylindrical portion and an insulator portion. The upper end of the rod body is fixed to the lower surface of the detachable flange. The insulator portion is formed to have a smaller diameter than the inner diameter of the cylindrical portion, and a portion of the insulator portion from its upper end is inserted into the cylindrical portion from the lower end side, and a portion of the insulator portion from its lower end protrudes downward from the cylindrical portion, and is attached to the cylindrical portion. The first portion of the rod electrode is inserted into the cylindrical portion and the insulator portion, and protrudes downward from the lower end of the insulator portion. The detachable flange has a hole for inserting the first portion of the rod electrode, The aforementioned hole has a smaller diameter than the outer diameter of the rod body. The insulating tube has the first portion inserted into it, with one axial end of the insulating tube protruding upward from the rod body, the other axial end of the insulating tube passing through the hole and notch of the detachable flange to a position above the integrated flange, and the other axial end of the insulating tube being inserted into the insulator portion within the cylindrical portion. The burner according to claim 1 or 2.

8. The side portion includes a front portion located on the side of the rod and a rear portion located on the opposite side of the front portion with the space in between, When the fastener is released, the rod unit, including the detachable flange and the rod attached thereto, can be tilted diagonally with respect to the vertical direction such that the tip of the rod electrode is above the integrated flange and overlaps the area within the notch when viewed from above, the rod body and the detachable flange are positioned below the integrated flange, and the axis of the rod body is positioned towards the rear as it moves downward. The front portion is displaced toward the rear portion as it extends downward, in order to enable the tilted state. The burner according to claim 5.

9. The side portion is, A parallel portion is connected to the inner circumferential end of the integral flange and extends parallel to the vertical direction, Including a sloping portion formed in such a way that it moves away from the rod as it extends downward from the lower end of the parallel portion, The burner according to claim 5.

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