JP2011033244A - Combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device which improves the positioning accuracy of at least either one of an ignition electrode or a frame rod in a mounting hole. <P>SOLUTION: An insulator of the ignition electrode 40 is inserted and fixed to the mounting hole 70 provided on the mounting plate 7 of the combustion device 1. A pair of projections are provided at the inner peripheral edge of the mounting hole 70. One corner part of the mounting hole 70 serves as a reference point for positioning the insulator. The respective positions of the pair of projections are defined so that a point where a perpendicular drawn down from the projection provided on the upper side of the mounting hole 70 is orthogonal to a perpendicular drawn down from the projection provided on the left side is positioned on a virtual diagonal line interconnecting two corners which are the one corner and a corner located in the diagonal position. Thus, the insulator is pressed toward the reference point, so as to securely position the insulator in the mounting hole 70. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a combustion apparatus, and in particular, to a combustion apparatus provided with a burner.

  Conventionally, a combustion apparatus has been installed in a gas water heater. The combustion apparatus includes a plurality of gas burners in a burner case. An ignition electrode and an ignition detection frame rod are respectively attached to the side surfaces of the burner case. For example, there is known a gas burner ignition mechanism mounting structure in which a spark plug (ignition electrode) and a frame rod are mounted on a mounting plate, and the mounting plate is mounted on a burner body (see, for example, Patent Document 1). A mounting hole is provided in the mounting plate. An ignition plug and a frame rod are respectively inserted into the mounting holes, and the holding plate is fixed to the mounting plate using screws, whereby an ignition mechanism is configured as one unit, and the mounting plate is attached to the burner body. .

Japanese Utility Model Publication No.3-30056

  However, in the structure for attaching the ignition mechanism of the gas burner described in Patent Document 1, there may be a backlash between the attachment hole and the ignition electrode and the insulator of the frame rod due to the dimensional tolerance generated during mass production of the combustion device. Since the positioning of the ignition electrode and the frame rod with respect to the burner requires high accuracy, there is a possibility that ignition and ignition detection cannot be performed accurately if play occurs in the mounting portion in the mounting hole. Further, if the size of the mounting hole is tightened, the insulator may be broken. Further, since the resin has a problem in heat resistance, it cannot be adopted as a material for the insulator, and the problem of dimensional tolerance cannot be solved.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a combustion apparatus that can improve the positioning accuracy of at least one of an ignition electrode and a frame rod in a mounting hole.

  In order to achieve the above object, a combustion apparatus according to a first aspect of the present invention includes a combustion apparatus having an attachment hole for inserting and fitting at least an ignition electrode or a frame rod insulator on a side surface of a burner case that supports the burner. The mounting hole includes at least one corner formed by two sides that intersect each other, and a pair of protrusions that protrude toward the inside of the mounting hole are provided on the inner edge of the mounting hole. When each of the corners is used as a reference point for positioning the insulator, a virtual reference line that passes through the reference point and divides the mounting hole into two regions is set. The pair of protrusions are respectively provided at positions sandwiching the intersection with the inner edge of the mounting hole.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the intersection point is a position where two sides respectively opposed to the two sides intersect each other.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the pair of protrusions are arranged close to each other across the intersection.

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the intersection point is another corner of the mounting hole, and the virtual reference line Is a diagonal line of the mounting hole.

  In addition to the configuration of the invention according to claim 4, the combustion apparatus of the invention according to claim 5 includes two perpendicular lines respectively lowered from the pair of protrusions to two sides respectively opposed to the pair of protrusions. Are located on the diagonal line.

  In addition to the configuration of the invention according to any one of claims 1 to 5, the combustion device of the invention according to claim 6 has a cross-sectional shape in a direction perpendicular to the axial direction of the insulator corresponding to the mounting hole. It is a shape.

  In the combustion apparatus according to the first aspect, the side surface of the burner case that supports the burner has a mounting hole for inserting and fitting at least an ignition electrode or a frame rod insulator. The mounting hole has at least one corner, and the corner serves as a reference point for positioning the insulator. The pair of protrusions provided on the inner edge portion of the attachment hole is provided at a position sandwiching the intersection of the virtual reference line dividing the attachment hole region into two regions and the inner edge portion of the attachment hole. Therefore, when the pair of protrusions abut on the insulator, the insulator is pushed from the intersection side toward the reference point. That is, since the position of the insulator can be fixed to the reference point, the positioning accuracy of the ignition electrode or the frame rod in the mounting hole can be improved. Furthermore, since the size of the mounting hole is not tight with respect to the insulator, the insulator can be prevented from cracking.

  Further, in the combustion apparatus according to claim 2, in addition to the effect of the invention according to claim 1, since the intersection is a position where two sides opposite to each other intersect each other, the pair of protrusions are the reference points. The insulator can be pushed into the two sides forming the corners. As a result, the insulator can be reliably pushed toward the reference point.

  Further, in the combustion apparatus according to claim 3, in addition to the effect of the invention according to claim 1 or 2, the pair of protrusions are arranged close to each other across the intersection, so that the insulator is used as a reference point. The force to push in can be strengthened.

  In the combustion apparatus according to claim 4, in addition to the effects of the invention according to any one of claims 1 to 3, the intersection is another corner of the attachment hole, and the virtual reference line is a diagonal line of the attachment hole. Therefore, the insulator can be pushed in with a good balance toward the reference point.

  In addition, in the combustion apparatus according to claim 5, in addition to the effect of the invention according to claim 4, two perpendiculars dropped from the pair of protrusions to two sides respectively opposed to the pair of protrusions are orthogonal to each other. Since the position is on the diagonal line, each protrusion pushes the insulator toward two sides respectively opposed to the pair of protrusions. Thereby, since the insulator can be pushed toward the reference point, the positioning accuracy of the ignition electrode or the frame rod can be improved.

  Further, in the combustion apparatus according to claim 6, in addition to the effect of the invention according to any one of claims 1 to 5, the cross-sectional shape orthogonal to the axial direction of the insulator is a shape corresponding to the mounting hole. The corresponding side surfaces of the insulator can be brought into close contact with the two sides forming the corners that are the points. Thereby, the positioning accuracy of the electrode for ignition or the frame rod can be improved.

2 is a perspective view of the combustion apparatus 1 as viewed from the front side. FIG. 2 is a perspective view of the combustion apparatus 1 as seen from the back side. FIG. It is a disassembled perspective view of the combustion apparatus 1 of FIG. 3 is a rear view of the burner case 2. FIG. 4 is a left side view of the frame rod 30. FIG. 3 is a front view of the frame rod 30. FIG. 3 is a left side view of an ignition electrode 40. FIG. 3 is a front view of an ignition electrode 40. FIG. FIG. FIG. FIG. 6 is a diagram showing a positional relationship of each part in the mounting hole 70. It is a figure of attachment hole 70A which is the 1st modification. It is a figure of the attachment hole 70B which is a 2nd modification.

  Hereinafter, the combustion apparatus 1 which is one Embodiment of this invention is demonstrated with reference to drawings. The combustion apparatus 1 shown in FIG. 1 is used by being attached in an appliance such as a gas water heater (not shown). The combustion apparatus 1 includes a box-like burner case 2 having an upper portion opened. Inside the burner case 2, a plurality of light and dark burners 9 are juxtaposed in the horizontal direction to form a burner group 10.

  As shown in FIGS. 1 and 2, the burner case 2 includes a right side wall 3 (see FIG. 4), a left side wall 4, a front wall 5, and a back wall 6 (see FIGS. 2 and 4). Yes. A mounting plate 7 for mounting the combustion apparatus 1 in the instrument is provided above the back wall 6. The mounting plate 7 includes a main body portion 12 having a rectangular shape when viewed from the front, and a locking portion 13 that is bent rearward at a substantially right angle at the upper end portion of the main body portion 12. The locking portion 13 is a portion that is locked to a locked portion (not shown) at an attachment location in the instrument when installed in the instrument.

  As shown in FIG. 1, a flame rod 30 for ignition detection is attached to the front right side of the main body 12, and an ignition electrode 40 is attached to the left side. A cover plate 17 is fixed to the front surface of the main body 12 so as to cover them. From the holes 18 and 19 provided in the cover plate 17, the tips of the frame rod 30 and the ignition electrode 40 protrude toward the upper part of the burner group 10, and are positioned at predetermined positions.

  2 and 4, the back wall 6 has a pair of upper and lower gas supply holes 6A and 6B (see FIG. 4) for supplying fuel gas to the plurality of dark and light burners 9 constituting the burner group 10. Are arranged in the horizontal direction. The fuel gas flowing in from the gas supply holes 6A and 6B is supplied to the light and dark burners 9, and is ignited and burned by the ignition electrode 40. Ignition in the burner group 10 is detected by the frame rod 30.

  Next, the structure of the mounting plate 7 will be described. As shown in FIGS. 3 and 4, the mounting plate 7 is a rectangular iron plate that is horizontally long when viewed from the front. A substantially rectangular mounting hole 60 for inserting and fixing the frame rod 30 is provided in the approximate center when viewed from the back surface of the main body 12 of the mounting plate 7, and the ignition electrode 40 is inserted and fixed on the right side thereof. A substantially rectangular mounting hole 70 is provided. The mounting hole 60 and the mounting hole 70 are mirror-symmetrical to each other. The specific shapes of the mounting hole 60 and the mounting hole 70 will be described later.

  Next, the mounting structure of the frame rod 30 and the ignition electrode 40 on the mounting plate 7 will be described. As shown in FIG. 3, the frame rod 30 and the ignition electrode 40 are inserted and fixed in the mounting holes 60 and 70 provided in the main body 12 of the mounting plate 7. A pair of plate-shaped electrode packings 21, 22 are sandwiched between the frame rod 30 and the ignition electrode 40 inserted and fixed in the mounting holes 60, 70, respectively, on the back surface of the main body 12 of the mounting plate 7. ing. The electrode packing 21 is provided with a through hole 23 corresponding to a cross-sectional shape orthogonal to the axial direction of an insulator 31 (see FIG. 5) described later of the frame rod 30. An insulator 31 of the frame rod 30 is inserted into the through hole 23. The electrode packing 22 is also provided with a through-hole 24 corresponding to a cross-sectional shape in a direction orthogonal to the axial direction of an insulator 41 (see FIG. 7) described later of the ignition electrode 40. An insulator 41 of the ignition electrode 40 is inserted into the through hole 24.

  Further, the electrode holder 50 is screw-fixed to the back surface of the mounting plate 7 of the frame rod 30 and the ignition electrode 40 inserted and fixed in the mounting holes 60 and 70. The electrode holder 50 is a substantially rectangular iron plate when viewed from the front, and a rectangular opening 51 is provided at the center thereof. On the left side when the opening 51 is viewed from the back side, there is provided a concave portion 52 that is the same shape as the outer peripheral shape of a flange portion 32 (to be described later) of the frame rod 30 and that is recessed outward to include the thickness of the flange portion 32. Yes. A circular hole 55 is provided at the bottom of the recess 52. On the right side of the opening 51, there is provided a concave portion 53 that has the same shape as a flange portion 42, which will be described later, of the ignition electrode 40 and that is recessed outward to the extent that the thickness of the flange portion 42 is included. A circular hole 56 is provided at the bottom of the recess 53.

  The electrode holder 50 having the above shape is fixed to the back surface of the main body 12 of the mounting plate 7 with a plurality of screws 80 so as to cover the frame rod 30 and the ignition electrode 40. The rear end portions of the frame rod 30 and the ignition electrode 40 protrude from the holes 55 and 56 of the recesses 52 and 53 of the electrode holder 50, respectively. Since the flange portion 32 (see FIG. 5) of the frame rod 30 and the flange portion 42 (see FIG. 7) of the ignition electrode 40 are engaged with the recesses 52 and 53, the frame rod 30 and the ignition electrode 40 are engaged. Can be prevented from coming off. Thus, the frame rod 30 and the ignition electrode 40 are securely attached to the attachment plate 7.

  Next, the structure of the frame rod 30 will be briefly described with reference to FIGS. The frame rod 30 includes an electrode rod 34 that is a thin metal rod. A ceramic insulator 31 is attached to the center of the electrode rod 34 in the longitudinal direction. The insulator 31 is formed with a flange portion 32 extending outward in the radial direction of the electrode rod 34 and an attachment portion 33 provided on the distal end side of the electrode rod 34 adjacent to the flange portion 32. The attachment portion 33 is a portion that is inserted into and fixed to the attachment hole 60 (see FIG. 4) of the attachment plate 7. The shape of the flange portion 32 viewed from the axial direction is substantially rectangular. The shape of the mounting portion 33 viewed from the axial direction is a substantially rectangular shape (see FIG. 6) in which one corner portion is formed in an arc shape.

  Specifically, as shown in FIG. 6, when the attachment portion 33 is viewed from the axial direction of the electrode rod 34, the attachment portion 33 has a planar side surface 33 </ b> A and one end of the side surface 33 </ b> A at right angles to one end thereof. And a side surface 33C that connects the other end of the side surface 33A and the other end of the side surface 33B in an arc shape. A portion of the electrode rod 34 protruding from the distal end side of the insulator 31 is bent at an obtuse angle at the center thereof.

  Next, the structure of the ignition electrode 40 will be described with reference to FIGS. The ignition electrode 40 has the same structure as the frame rod 30. The ignition electrode 40 includes an electrode rod 44 that is a thin metal rod. A ceramic insulator 41 is attached to substantially the center of the electrode rod 44 in the longitudinal direction. The insulator 41 is formed with a flange portion 42 extending outward in the radial direction of the electrode rod 44 and an attachment portion 43 provided on the distal end side of the electrode rod 44 adjacent to the flange portion 42. The attachment portion 43 is a portion that is inserted into and fixed to the attachment hole 70 of the attachment plate 7. The shape of the flange portion 42 viewed from the axial direction is a substantially rectangular shape. The shape of the mounting portion 43 viewed from the axial direction is a rectangular shape in which one corner is formed in an arc shape.

  Specifically, as shown in FIG. 8, when the attachment portion 43 is viewed from the axial direction of the electrode rod 44, the attachment portion 43 has a planar side surface 43A and one end of the side surface 43A at right angles to its own end. And a side surface 43C that connects the other end of the side surface 43A and the other end of the side surface 43B in an arc shape. The cross-sectional shape in the direction orthogonal to the axis of the mounting portion 43 is a mirror-symmetric shape with respect to the cross-sectional shape in the direction orthogonal to the axial direction of the mounting portion 33 of the frame rod 30. The tip of the portion of the electrode rod 44 that protrudes from the tip of the insulator 41 is bent at an obtuse angle.

  Next, the shape of the mounting holes 60 and 70, which is a feature of the present invention, will be described with reference to FIGS. In addition, the attachment holes 60 and 70 shown to FIG. 9, FIG. 10 are the figures which looked at the attachment board 7 from the back surface. As described above, the attachment portion 33 of the lever 31 of the frame rod 30 is inserted and fixed in the attachment hole 60. The attachment hole 60 is formed in a substantially rectangular shape having a right side 61, a left side 62, an upper side 63, and a lower side 64, and a corner portion formed by the left side 62 and the upper side 63 is formed in an arc shape. A corner formed by the upper side 63 and the right side 61 is a vertex A, and a corner formed by the left side 62 and the lower side 64 on the diagonal is a vertex B. The vertex B is a reference point serving as a reference for positioning the attachment portion 33 of the lever 31 of the frame rod 30. In this case, a protrusion 66 protruding toward the lower side 64 is provided in the vicinity of the vertex A of the upper side 63. In addition, a protrusion 67 that protrudes toward the left side 62 is provided in the vicinity of the vertex A of the right side 61. In addition, each front-end | tip part of the protrusion parts 66 and 67 is rounded and processed in the taper shape.

  On the other hand, the attachment portion 43 (see FIGS. 7 and 8) of the insulator 41 of the ignition electrode 40 is inserted and fixed in the attachment hole 70 shown in FIG. An attachment portion 43 (see FIG. 8) of the insulator 41 of the ignition electrode 40 is inserted and fixed in the attachment hole 70. The mounting hole 70 is formed in a substantially rectangular shape having a left side 71, a right side 72, an upper side 73, and a lower side 74, and a corner formed by the right side 72 and the upper side 73 is formed in an arc shape. A corner formed by the upper side 73 and the left side 71 is a vertex A, and a corner formed by the right side 72 and the lower side 74 on the diagonal is a vertex B. The vertex B is a point (reference point) that serves as a reference for positioning the attachment portion 43 of the insulator 41 of the ignition electrode 40. In this case, a protrusion 76 protruding toward the lower side 74 is provided in the vicinity of the vertex A of the upper side 73. Further, in the vicinity of the vertex A of the left side 71, a protrusion 77 protruding toward the right side 72 is provided. Each tip of the projections 76 and 77 is processed to be tapered and rounded.

  In the present embodiment, the positions of the pair of protrusions 66, 67, 76, 77 are defined as follows in the mounting holes 60, 70 having the above-described shape. Here, the protrusions 76 and 77 of the mounting hole 70 for inserting and fixing the ignition electrode 40 will be described as an example with reference to FIG.

  As described above, when the corner at the diagonal position with respect to the vertex A of the mounting hole 70 is the vertex B, the vertex B becomes the “reference point” for positioning the insulator 41. Then, a virtual reference line P connecting the vertex A and the vertex B is drawn, and on the reference line P, a perpendicular line Q1 dropped from the protrusion 76 provided on the upper side 73 to the lower side 74 and a protrusion provided on the left side 71 Each position of the protrusions 76 and 77 is defined so that a point perpendicular to the perpendicular line Q2 dropped from the portion 77 on the extension line of the right side 72 is located.

  The attachment portion 43 of the insulator 41 of the ignition electrode 40 is inserted into the attachment hole 70 having such a shape from the back surface side of the attachment plate 7. At this time, the corner formed by the side surface 43B and the side surface 43C of the attachment portion 43 shown in FIG. 8 is aligned with the apex B, the side surface 43A is in contact with the left side 71, and the side surface 43B is in contact with the lower side 74. At this time, the tip portions of the protrusions 76 and 77 abut against the side surface 43C and the side surface 43A, respectively.

  In this state, the protrusion 76 presses the mounting portion 43 toward the lower side 74 (in the direction of the perpendicular Q1). The protrusion 77 presses the attachment portion 43 toward the right side 72 (in the direction of the perpendicular Q2). That is, the attachment portion 43 is pressed toward the apex B that is the reference point. As a result, the mounting portion 43 is not rattled in the mounting hole 70, so that the positioning of the mounting portion 43 in the mounting hole 70 can be ensured. Thus, since the insulator 41 is pushed into the attachment hole 70 with the protrusions 76 and 77 hitting the outer peripheral surface of the attachment portion 43, the insulator 41 can be fixed to the attachment plate 7 without rattling. . In addition, since the attachment portion 43 is pressed by the protrusions 76 and 77 from the upper and left two directions, the attachment portion 43 can be prevented from rotating in the attachment hole 70. In this way, the ignition electrode 40 in the burner case 2 can be accurately positioned.

  Further, the protrusions 66 and 67 are arranged close to the vertex A, respectively. Thereby, the force which presses the attaching part 33 of the insulator 31 toward the vertex B can be strengthened.

  The same applies to the mounting hole 60. The attachment portion 33 of the insulator 31 of the frame rod 30 is inserted into the attachment hole 60 from the back side of the attachment plate 7. At this time, the corner formed by the side surface 33B and the side surface 33C of the mounting portion 33 shown in FIG. 6 is aligned with the apex B, the side surface 33A is in contact with the right side 61, and the side surface 33B is in contact with the lower side 64. At this time, the tip portions of the protrusions 66 and 67 abut against the side surface 33C and the side surface 33A.

  In this state, the protrusion 66 presses the attachment portion 33 toward the lower side 64. The protruding portion 67 presses the attachment portion 33 toward the left side 62. That is, the attachment portion 33 is pressed toward the vertex B that is the reference point. As a result, the mounting portion 33 is not rattled in the mounting hole 60, so that the positioning of the mounting portion 33 in the mounting hole 60 can be ensured. When the dimensional tolerance between the mounting portion 33 and the mounting hole 60 is small, the mounting portion 33 is inserted into and fixed to the mounting hole 60 while the projecting portions 66 and 67 are shaved. On the other hand, when the dimensional tolerance between the attachment portion 33 and the attachment hole 60 is large, the attachment portion 33 is inserted and fixed in the attachment hole 60 as it is. Further, since the mounting portion 33 is also pressed from the upper and right directions by the projections 66 and 67, the mounting portion 33 can be prevented from rotating in the mounting hole 60. In this way, the positioning of the frame rod 30 in the burner case 2 can be performed accurately. In this way, the positioning of the frame rod 30 in the burner case 2 can be performed accurately.

  Further, as shown in FIG. 2, the mounting holes 60 and 70 provided in the mounting plate 7 are mirror-symmetrical with each other, so that the positions of the frame rod 30 and the ignition electrode 40 are erroneously mounted. Can be prevented.

  Furthermore, since it is not necessary to tighten the attachment holes 60 and 70 with respect to the dimensions of the attachment portions 33 and 43 of the insulators 31 and 41, the insulators 31 and 41 can be prevented from cracking.

  As described above, the combustion apparatus 1 of the present embodiment includes the burner case 2 that supports the burner group 10 inside. In the mounting holes 60, 70 provided in the mounting plate 7 of the burner case 2, the mounting portions 33, 43 of the frame rod 30 and the insulators 31, 41 of the ignition electrode 40 are respectively inserted and fixed. The attachment hole 70 has a shape corresponding to the attachment portion 43 provided in the insulator 41 of the ignition electrode 40, and a pair of protrusions 76 and 77 are provided on the inner edge thereof. Here, when a corner at a diagonal position with respect to the vertex A of the mounting hole 70 is a vertex B, the corner serves as a “reference point” for positioning the insulator 41. Then, a virtual diagonal line connecting the vertex A and the vertex B is drawn, and on the diagonal line, a perpendicular Q1 dropped from the protrusion 76 provided on the upper side 73 to the lower side 74, and a right side from the protrusion 77 provided on the left side 71 Each position of the protrusions 76 and 77 is defined so that a point perpendicular to the perpendicular line Q <b> 2 dropped on the extension line 72 is located.

  Thereby, the protrusion 76 presses the attachment portion 43 toward the lower side 74, and the protrusion 77 presses the attachment portion 43 toward the right side 72. That is, the attachment portion 43 is pressed toward the apex B that is the reference point. As a result, the mounting portion 43 is not rattled in the mounting hole 70, so that the positioning of the mounting portion 43 in the mounting hole 70 can be ensured. Furthermore, since the attachment part 43 is pressed by the protrusions 76 and 77 from the upper and left two directions, the attachment part 43 can be prevented from rotating in the attachment hole 70. In this way, the ignition electrode 40 in the burner case 2 can be accurately positioned. The same effect can be obtained for the mounting hole 60.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the shape of the mounting holes 60 and 70 is not limited to the above embodiment. That is, in the mounting hole, one corner of the mounting hole is set as a “reference point” that serves as a reference for positioning the mounting portion of the insulator, and a virtual reference line that passes through the reference point and divides the mounting hole is set. . Then, a pair of protrusions may be provided in the attachment hole so as to sandwich an intersection with the side of the attachment hole opposite to the reference point of the virtual reference line from both sides.

  For example, like a mounting hole 70A which is a first modification shown in FIG. 12, the virtual reference line P passing through the apex B (reference point) and the intersection A where the side of the mounting hole 70A intersects are sandwiched from both sides, A pair of protrusions 76 and 77 may be provided. That is, the intersection point A is not necessarily a corner, and a pair of protrusions may be provided on two sides that respectively face the two sides that constitute the reference point B. Thereby, each protrusion part can push in an insulator toward the edge | side which opposes itself, As a result, the whole insulator can be pushed in toward a reference point.

  In addition, the intersection A sandwiched by one protrusion is another corner that is diagonal to the one corner set as the reference point of the mounting hole, and as in the above-described embodiment, The reference line P is preferably a diagonal line. Further, for example, as in the mounting hole 70B which is the second modified example shown in FIG. 13, the corners other than the vertex A and the vertex B may be tapered, cut linearly, or curved. Well, the shape is not limited at all.

  Moreover, the corner | angular part used as the reference point of the positioning of the insulator set to the attachment hole should just be formed by the two sides which cross at least mutually, for example, includes the rounded shape.

DESCRIPTION OF SYMBOLS 1 Combustor 2 Burner case 7 Mounting plate 9 Concentration burner 10 Burner group 30 Frame rod 31 Insulator 32 Flange part 33 Attachment part 40 Ignition electrode 41 Insulator 42 Flange part 43 Attachment part 60 Attachment hole 66 Protrusion part 67 Protrusion part 70 Attachment hole 76 Projection 77 Projection A A vertex (intersection)
B vertex (intersection)
P Virtual reference line Q1 Vertical line Q2 Vertical line

Claims (6)

A combustion apparatus having a mounting hole for inserting and fitting at least an ignition electrode or a frame rod insulator on a side surface of a burner case supporting the burner;
The mounting hole includes at least one corner formed by two sides intersecting each other,
A pair of protrusions that protrude toward the inside of the attachment hole are provided on the inner edge of the attachment hole,
When the corner portion is used as a reference point for positioning the insulator, a virtual reference line that passes through the reference point and divides the attachment hole into two regions is set, and the virtual reference line and an inner edge of the attachment hole A combustion apparatus, wherein the pair of protrusions are provided at positions sandwiching an intersection with the part.   The combustion apparatus according to claim 1, wherein the intersection point is a position where two sides respectively opposed to the two sides intersect each other.   The combustion apparatus according to claim 1 or 2, wherein the pair of protrusions are arranged close to each other across the intersection. The intersection is another corner of the mounting hole,
The combustion apparatus according to any one of claims 1 to 3, wherein the virtual reference line is a diagonal line of the mounting hole.   5. The combustion apparatus according to claim 4, wherein a position where two perpendiculars dropped from the pair of protrusions on two sides respectively opposed to the pair of protrusions are orthogonal to each other is on the diagonal line.   The combustion apparatus according to any one of claims 1 to 5, wherein a cross-sectional shape in a direction orthogonal to an axial direction of the insulator is a shape corresponding to the mounting hole.

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