Afterburner and heating cooker

Abstract

To provide an afterburner which can secure sealability with a simple structure and can smoothly introduce a gas and air into a burner body, and to provide a heating cooker.SOLUTION: An afterburner 9 includes an outer throat part 101, a burner body 102, and an inner throat part 8. The outer throat part 101 takes a gas and air thereinto. The burner body 102 extends from a downstream side end of the outer throat part 101 in an axial direction coaxially with the outer throat part 101. The burner body 102 causes a mixed gas of the gas and the air supplied from the outer throat part 101 to burn on a combustion surface 93 and form a flame. The inner throat part 8 is fixed to the inner side of the burner body 102 and extends in an axial direction coaxially with the outer throat part 101. The inner throat part 8 is fixed so that its upstream side end closely contacts with the downstream side end of the outer throat part 101. Internal spaces of the inner throat part 8 and the outer throat part 101 communicate with each other.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an afterburner and a cooking device. [Background technology]

[0002] Conventionally, afterburners are known that are installed inside the exhaust duct of a grill chamber and heat and reduce oily smoke and odorous components generated by food ingredients contained in the combustion exhaust gas flowing through the exhaust duct. The afterburner comprises a gas inlet and a burner body. The gas inlet takes in gas and air from the outside. The burner body is provided with a flame nozzle. The gas and air are mixed in the gas inlet, and the mixed gas flows into the burner body. For example, there is known an afterburner in which the position of the flame nozzle is offset from the gas inlet in a direction perpendicular to the extension direction of the gas inlet (see, for example, Patent Document 1).

[0003] On the other hand, depending on the structure of the grill chamber, it may not be possible to install the flame port at an offset position. In this case, compared to a configuration where the flame port is installed at an offset position, there is a possibility that the run-up distance for mixing the gas and air may not be sufficient. Therefore, for example, it is possible to install the gas inlet port so that it extends into the interior of the burner body from the inlet of the burner body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-163624 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of a structure in which the gas inlet portion protrudes into the inside of the burner body, it is necessary to ensure sealing between the gas inlet portion and the burner body, and if the structure is complicated, there are problems in terms of production of the afterburner.

[0006] An object of the present invention is to provide an afterburner and a cooking device that can ensure sealing with a simple configuration and that can smoothly introduce gas and air into the inside of the burner body. [Means for solving the problem]

[0007] The afterburner of claim 1 is an afterburner that burns off oily smoke and odorous components contained in the combustion exhaust of a burner, and is characterized in that it comprises a cylindrical outer throat portion that takes in gas and air from the outside, a burner body that has a flame port portion that extends from the downstream end of the outer throat portion in an axial direction coaxial with the outer throat portion and receives the gas and air flowing from the outer throat portion and burns the mixed gas of the gas and air to form a flame, and a cylindrical inner throat portion that is fixed inside the burner body and extends in an axial direction coaxial with the outer throat portion, and inside the burner body, the upstream end of the inner throat portion is fixed so as to be in close contact with the downstream end of the outer throat portion, and the internal spaces of the inner throat portion and the outer throat portion are connected to each other.

[0008] In the afterburner of claim 2, a wall portion intersecting the axial direction may be provided downstream of the downstream end of the inner throat portion.

[0009] In the afterburner of claim 3, a connecting portion is provided between the downstream end of the inner throat portion and the wall portion, extending along the axial direction and connecting the downstream end of the inner throat portion and the wall portion, and the connecting portion may be provided with a protruding portion that protrudes in a direction intersecting the axial direction of the inner throat portion, and the protruding portion may extend along the axial direction.

[0010] The wall of the afterburner of claim 4 may be provided with a fixing portion that is fixed to the inside of the burner body.

[0011] In the afterburner of claim 5, the protruding portion may be a throttle portion formed by being recessed in the connecting portion in a direction intersecting the axial direction of the inner throat portion.

[0012] The afterburner of claim 6 is configured to be separated into a first member arranged on one side in a thickness direction intersecting the axial direction, and a second member arranged on the other side opposite to the one side and connected to the first member, and each of the first member and the second member comprises a throat forming portion which is a portion forming the outer throat portion and has a semi-cylindrical recess, and a body forming portion which is a portion forming the burner body and has bulging portions which bulge in directions away from each other in the thickness direction. the inner throat portion is disposed inside the bulging portion of each of the first member and the second member when the first member and the second member are combined with each other, and a step portion whose diameter increases on the bulging portion side by an amount equivalent to the thickness of the inner throat portion may be provided between the bulging portion and the downstream end of the outer throat portion.

[0013] The cooking device of claim 7 is a cooking device comprising a grill chamber equipped with a burner, an exhaust duct communicating with the rear of the grill chamber and discharging the combustion exhaust gas of the burner flowing from inside the grill chamber to the outside of the grill chamber, and an afterburner attached to the upstream side of the exhaust duct along which the combustion exhaust gas flows and burning off oily smoke and odorous components contained in the combustion exhaust gas, wherein the afterburner comprises a cylindrical outer throat portion that takes in gas and air from the outside, and a gas outlet extending from the downstream end of the outer throat portion to a gas outlet coaxial with the outer throat portion. The burner comprises a burner body extending in the axial direction and having a flame port that receives the gas and air flowing from the outer throat and burns the mixed gas of gas and air to form a flame, and a cylindrical inner throat that is fixed inside the burner body and extends in the axial direction coaxially with the outer throat, and inside the burner body, the inner throat is fixed so that its upstream end is in close contact with the downstream end of the outer throat, and the internal spaces of the inner throat and the outer throat are connected to each other. [Effects of the Invention]

[0014] According to the afterburner of claim 1, the inner throat portion is fixed inside the burner body, preventing gas leakage from the gap between the inner throat portion and the burner body. Therefore, the afterburner can ensure sealing performance with a simple configuration. This aspect eliminates the need for processes and management to ensure the afterburner's sealing performance, improving the productivity of the afterburner. Furthermore, this aspect allows the afterburner to be made compact by arranging the outer throat portion and the inner throat portion coaxially.

[0015] According to the afterburner of claim 2, the wall portion slows down the speed of the mixed gas flowing from the inner throat portion, preventing the mixed gas from overflowing in the axial direction. Therefore, the mixed gas flowing from the bulge portion to the burner port portion can be distributed evenly inside the burner body.

[0016] According to the afterburner of claim 3, the protrusion provided on the connecting part makes it easier for the mixed gas flowing out of the inner throat part to flow in a direction away from the axial center of the cylinder of the inner throat part before coming into contact with the wall part, thereby making it possible to more evenly distribute the mixed gas flowing in the burner body.

[0017] According to the afterburner of claim 4, the inner throat portion can be stably fixed to the inside of the burner body by the fixing portion.

[0018] According to the afterburner of claim 5, the protruding portion is formed as a recess by the narrowing, which improves the strength of the connection portion, thereby improving the force with which the fixing portion restrains the inner throat portion.

[0019] According to the afterburner of claim 6, it is possible to prevent a step from occurring at the boundary between the outer throat and the inner throat, allowing gas and air to be smoothly introduced into the inner throat, thereby preventing turbulence and the like from occurring inside the inner throat.

[0020] According to the cooking device of claim 7, the afterburner has an inner throat portion fixed to the inside of the burner body, which makes it possible to prevent gas leakage from the gap between the inner throat portion and the burner body with a simple configuration. Therefore, the cooking device does not require processes or management to ensure the sealing of the afterburner, improving the productivity of the afterburner. Furthermore, the cooking device allows for a compact afterburner by arranging the outer throat portion and the inner throat portion coaxially. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view of a grill device 1. [Figure 2] FIG. 1 is a cross-sectional perspective view of a grill device 1. [Figure 3] FIG. 1 is an exploded perspective view of a grill device 1. [Figure 4] FIG. 2 is a perspective view of the burner support base 3 and the afterburner 9. [Figure 5] FIG. 2 is a perspective view of an afterburner 9. [Figure 6] FIG. 1 is a perspective view of a combustion body 90, a fixed frame 95, and a burner assembly 100. [Figure 7] FIG. 1 is an exploded perspective view of a burner assembly 100. [Figure 8] 10 is a perspective view showing a state in which an inner throat portion 8 is fixed to the inside of a first member 5. FIG. [Figure 9] FIG. 2 is a perspective view showing a state in which a fixing flange 7 is fixed to a second member 6. [Figure 10] FIG. 2 is a rear view of the burner assembly 100. [Figure 11] FIG. 2 is a bottom view of the burner assembly 100. [Figure 12] FIG. 12 is a cross-sectional perspective view taken along the line II in FIG. 11. [Figure 13] FIG. 12 is a cross-sectional view taken along the line II in FIG. [Figure 14] FIG. 12 is a cross-sectional view taken along the line II-II in FIG. [Figure 15] FIG. 2 shows the gas flow inside the afterburner. DETAILED DESCRIPTION OF THE INVENTION

[0022] An embodiment of the present invention will be described below. Unless otherwise specified, the devices, component configurations, etc. described below are not intended to be limiting and are merely illustrative examples. The drawings are used to explain technical features that may be adopted by the present invention. In this embodiment, the front-to-back, left-to-right, and up-to-down directions shown in the drawings will be used for explanation. Furthermore, the scales of the drawings do not necessarily match each other, and the drawings are enlarged or reduced as appropriate depending on the objects shown.

[0023] The configuration of the grill device 1 will be described with reference to Figures 1 to 3. The grill device 1 is attached inside the housing of a built-in stove (not shown). The grill device 1 includes a grill chamber 2 and an exhaust duct 10. The grill chamber 2 contains food to be cooked, which is heated and cooked using a grill burner (described below). The grill burner generates combustion exhaust gas inside the grill chamber 2 by gas combustion.

[0024] The structure of the grill chamber 2 will now be described. As shown in Figures 1 and 2, the grill chamber 2 is a roughly rectangular parallelepiped with an open front. A grill opening 13 is formed in the front of the grill chamber 2. The grill opening 13 is opened and closed by a grill door (not shown). As shown in Figure 3, the grill chamber 2 comprises a lower case 11 and an upper case 12. The upper case 12 is fixed to the top of the lower case 11 with screws (not shown). An upper burner 21 is provided in roughly the center of the upper case 12.

[0025] The lower case 11 has a bottom wall 15, a right wall 16, a left wall 17, and a back wall 18, and is box-shaped with an open top and front. A moving mechanism 19 is provided inside the lower case 11. The moving mechanism 19 has rails and supports the grill door and grill grate (not shown) so that they can slide freely in the front-to-rear direction. A lower burner 23 extends in the front-to-rear direction on the inner surface of the right wall 16. A lower burner 24 extends in the front-to-rear direction on the inner surface of the left wall 17. The lower burners 23 and 24 face each other and form a flame toward the center of the grill chamber 2. In this embodiment, the upper burner 21 and the lower burners 23 and 24 are collectively referred to as "grill burners."

[0026] The structure of the exhaust duct 10 will be described. As shown in Figures 1 and 2, the exhaust duct 10 is connected to the rear of the grill chamber 2. The exhaust duct 10 is chimney-shaped and extends upward. An exhaust port 49 is provided at the top of the exhaust duct 10. A communication port 14 (see Figure 2) is provided between the rear of the grill chamber 2 and the exhaust duct 10. The communication port 14 connects the inside of the grill chamber 2 with the inside of the exhaust duct 10. Therefore, the combustion exhaust gas generated in the grill chamber 2 flows into the exhaust duct 10 through the communication port 14 and is discharged to the outside through the discharge port 49.

[0027] 2 and 3, exhaust duct 10 includes a duct bottom plate 27, a burner support base 3, and a duct body 4. Duct bottom plate 27 is fastened with screws to the upper rear end side of lower case 11. Duct bottom plate 27 protrudes rearward from the upper rear end of lower case 11 and forms the bottom of exhaust duct 10.

[0028] The burner support base 3 is fixed to the rear of the grill chamber 2 and forms the upstream portion (front end portion) of the exhaust duct 10. The burner support base 3 supports an afterburner 9, which will be described later. As shown in FIG. 4, the burner support base 3 includes a support plate 31, a right plate 32, a left plate 33, and a closing plate 34.

[0029] The support plate 31 has a rectangular shape that is long in the left-right direction in a plan view. An opening 37 is provided in the support plate 31. The opening 37 has a substantially rectangular shape that is long in the left-right direction. A combustion surface 93 (see Figure 2) of the afterburner 9, which will be described later, is positioned in the opening 37. Four fixing holes 311 are provided at the front end of the support plate 31, spaced apart from each other on the left and right, and two fixing holes 312 are provided at the rear end, spaced apart from each other on the left and right. The right plate 32 hangs down from the right end of the support plate 31. The left plate 33 hangs down from the left end of the support plate 31. The lower ends of the right plate 32 and the left plate 33 are fastened with screws to both the left and right sides of the upper surface of the duct bottom plate 27.

[0030] The closing plate 34 extends vertically upward from the rear end of the support plate 31 and has a generally rectangular shape that is long in the left-right direction when viewed from the front. The closing plate 34 closes an opening 461 (described below) that is provided in the front wall 46 of the duct body 4. A fixing piece 36 is provided at the upper end of the closing plate 34 and bent back forward. The fixing piece 36 has fixing holes 361 provided in three locations: the center, right side, and left side.

[0031] As shown in Figure 3, the duct body 4 is connected to the rear of the burner support base 3. The duct body 4 forms the portion of the exhaust duct 10 downstream of the afterburner 9. The duct body 4 is roughly box-shaped with openings on the front and bottom. An exhaust port 49 is provided on the rear end side of the upper surface of the duct body 4. An exhaust passage is formed inside the duct body 4, running from the open front surface toward the exhaust port 49. As shown in Figure 2, a catalyst plate 25 is attached at an angle inside the duct body 4 via a fixing member 20. The catalyst plate 25 is positioned midway through the exhaust passage.

[0032] The catalyst plate 25 is a rectangular plate, for example, a heat-resistant ceramic plate with a plurality of small holes, on which an oxidation catalyst such as platinum is supported. Such a catalyst plate 25 is heated and activated by the heat of combustion from the afterburner 9. When the combustion exhaust gas passes through the catalyst plate 25, the catalyst plate 25 oxidizes the oily smoke in the combustion exhaust, making it odorless and smokeless. A fixing member 20 is attached to the catalyst plate 25. The fixing member 20 is fixed inside the duct body 4, so that the catalyst plate 25 is supported midway along the exhaust passage inside the duct body 4.

[0033] The structure of the afterburner 9 will be described with reference to Figures 4 to 17. In Figures 5 to 17, in order to clearly explain the internal structure of the afterburner 9, the afterburner 9 and the following members that make up the afterburner 9 are shown upside down. The directions indicated by the arrows in the figures indicate the orientation of the afterburner 9 when it is attached to the exhaust duct 10.

[0034] As shown in FIGS. 4 and 5, the afterburner 9 is formed in a generally cylindrical shape that is long in the left-right direction, and supports a combustion surface 93 that serves as a flame opening for forming a flame, facing downward.

[0035] As shown in FIG. 6 , the afterburner 9 includes a combustion body 90, a fixed frame 95, and a burner assembly 100. The combustion body 90 includes two combustion bodies 91 and 92. The combustion bodies 91 and 92 are roughly rectangular parallelepipeds that are long in the left-right direction. The fixed frame 95 is a rectangular frame that is long in the left-right direction, and a partition wall 96 is provided in the center in the left-right direction. The partition wall 96 divides the inside of the fixed frame 95 into left and right halves. A right opening 97 is formed on the right side of the partition wall 96, and a left opening 98 is formed on the left side of the partition wall 96. The combustion body 91 is fixed inside the right opening 97, and the combustion body 92 is fixed inside the left opening 98. The underside of each of the combustion bodies 91 and 92 is the combustion surface 93.

[0036] The burner assembly 100 comprises an external throat section 101 and a burner body 102. The external throat section 101 is cylindrical and extends in the left-right direction, with a gas inlet 115 at its right end. The gas inlet 115 opens to the right. The external throat section 101 comprises, in order from the gas inlet 115 to the left, a large-diameter section 111, a reduced-diameter section 112, and a small-diameter section 113. The large-diameter section 111 is generally cylindrical. The reduced-diameter section 112 is generally conical and cylindrical, with a diameter that decreases from the large-diameter section 111 side to the left. The small-diameter section 113 extends leftward from the left end of the reduced-diameter section 112 and is generally cylindrical with a diameter smaller than that of the large-diameter section 111. The external throat section 101 takes in gas and air from the gas inlet 115 and supplies them to the burner body 102.

[0037] The burner body 102 has a slightly flattened, approximately cylindrical shape extending from the left end of the external throat portion 101 in the same axial direction as the external throat portion 101. An opening 71 is provided on the underside of the burner body 102. The opening 71 is approximately rectangular and elongated in the left-right direction in a plan view. A combustion element 90, to which a fixing frame 95 is attached, is fixed to the opening 71. An internal throat portion 8 is fixed to the inside of the burner body 102. The internal throat portion 8 has a cylindrical shape extending in the same axial direction as the external throat portion 101. The internal throat portion 8 supplies a mixture of gas and air supplied from the external throat portion 101 to the inside of the burner body 102. The mixture gas supplied to the inside of the burner body 102 is supplied to combustion elements 91 and 92 fixed to the opening 71. A downward flame is formed as the gas burns on the combustion surface 93.

[0038] The configuration of the burner assembly 100 will be described with reference to Figure 7. The burner assembly 100 comprises a first member 5, an inner throat portion 8, a second member 6, and a fixing flange 7, which are configured by combining together in the vertical direction.

[0039] The structure of the first member 5 will be described. As shown in Fig. 7, the first member 5 forms the upper half of the burner assembly 100. The first member 5 includes a first throat forming portion 51 and a first main body forming portion 52.

[0040] The first throat forming portion 51 is formed by pressing a metal plate and forms the upper half of the outer throat portion 101 (see FIG. 6). The first throat forming portion 51 has a generally rectangular shape that is long in the left-right direction in a plan view. The first throat forming portion 51 has a recess 54. The recess 54 is provided in the first throat forming portion 51 except for a front end portion 571 and a rear end portion 572. The recess 54 is formed by pressing into a semi-cylindrical shape that bulges upward (toward the bottom in FIG. 7) and extends in the left-right direction. The front end portion 571 and the rear end portion 572 are flat.

[0041] The recess 54 is provided with, in order from right to left, a large diameter forming portion 541, a reduced diameter forming portion 542, and a small diameter forming portion 543. The large diameter forming portion 541 is formed in a semi-cylindrical shape that bulges upward, and forms the upper half of the large diameter portion 111. The reduced diameter forming portion 542 is formed in a semi-conical cylindrical shape that bulges upward and narrows to the left, and forms the upper half of the reduced diameter portion 112. The small diameter forming portion 543 is formed in a semi-cylindrical shape that bulges upward, and forms the upper half of the small diameter portion 113.

[0042] The first body forming portion 52 is also formed by pressing a metal plate and forms the upper half of the burner body 102. The first body forming portion 52 has a generally rectangular shape that is long in the left-right direction when viewed from above. The first body forming portion 52 has a bulging portion 55. The bulging portion 55 is provided in a portion of the first body forming portion 52 excluding the outer peripheral portion 58, and bulges in a direction away from the second member 6 in the thickness direction (height direction) of the burner body 102. Therefore, the first body forming portion 52 has a generally U-shape that opens downward in cross section (see Figure 14). The bulging portion 55 has a generally rectangular shape that is long in the left-right direction when viewed from above. The outer peripheral portion 58 is flat and generally U-shaped that opens to the right when viewed from above.

[0043] A bulge 56 is further provided in the region from the center to the right end of the bulge 55 in the left-right direction. The bulge 56 bulges upward relative to the small diameter forming portion 543 of the recess 54 by the thickness of the inner throat portion 8 (described below). Therefore, a step 59 is formed between the right end of the lower surface of the bulge 56 and the left end of the small diameter forming portion 543 (see Figures 7 and 13). The bulge 56 has a generally rectangular shape that is long in the left-right direction in a plan view. The inner throat portion 8 is disposed on the inner surface of the bulge 56. A pair of protrusions 551 are provided in the bulge 55, spaced to the left from the left end of the bulge 56, and are arranged side by side with a gap in the front-to-rear direction. The protrusions 551 protrude in a hemispherical shape.

[0044] The following describes the structure of the second member 6. As shown in Fig. 7, the second member 6 forms the lower half of the burner assembly 100. The second member 6 includes a second throat forming portion 61 and a second main body forming portion 62.

[0045] The second throat forming portion 61 is formed by pressing a metal plate and forms the lower half of the outer throat portion 101 (see FIG. 6). The second throat forming portion 61 has a generally rectangular shape that is long in the left-right direction in a plan view. The second throat forming portion 61 has a recess 64. The recess 64 is provided in the second throat forming portion 61 except for a front end portion 671 and a rear end portion 672. The recess 64 is formed by pressing into a semi-cylindrical shape that bulges downward (upward in FIG. 7) and extends in the left-right direction. The front end portion 671 and the rear end portion 672 are flat.

[0046] The recess 64 is provided with, in order from right to left, a large diameter forming portion 641, a reduced diameter forming portion 642, and a small diameter forming portion 643. The large diameter forming portion 641 is formed in a semi-cylindrical shape that bulges downward, and forms the lower half of the large diameter portion 111. The reduced diameter forming portion 642 is formed in a semi-conical cylindrical shape that bulges downward and narrows to the left, and forms the lower half of the reduced diameter portion 112. The small diameter forming portion 643 is formed in a semi-cylindrical shape that bulges downward, and forms the lower half of the small diameter portion 113.

[0047] The second body forming portion 62 is also formed by pressing a metal plate, and forms the lower half of the burner body 102. The second body forming portion 62 has a generally rectangular shape that is long in the left-right direction when viewed from above. The second body forming portion 62 has a bulging portion 65. The bulging portion 65 is provided in a portion of the second body forming portion 62 excluding the outer peripheral portion 68, and bulges in a direction away from the first member 5 in the thickness direction (height direction) of the burner body 102. Therefore, the second body forming portion 62 has a generally U-shape that opens upward in cross section (see Figure 14). The bulging portion 65 has a generally rectangular shape that is long in the left-right direction when viewed from above.

[0048] An opening 63 is provided at the bottom of the bulging portion 65. The opening 63 is a generally rectangular shape that is long in the left-right direction in a plan view. The lower side of the inner throat portion 8 is located inside the bulging portion 65. The bulging portion 65 bulges downward (upward in Figure 7) relative to the small diameter forming portion 643 of the recess 64 by the plate thickness of the inner throat portion 8. Therefore, a step portion 66 (see Figures 7 and 13) is formed between the right end of the inner surface of the bulging portion 56 and the left end of the inner surface of the small diameter forming portion 643. The outer peripheral portion 68 is flat and generally U-shaped, opening to the right in a plan view. A crimping piece 69 is provided on the outer edge of the outer peripheral portion 68.

[0049] The shape of the fixing flange 7 will now be described. As shown in Figure 7, the fixing flange 7 has a frame portion 70. The frame portion 70 is a frame body having a generally rectangular shape that is long in the left-right direction in a plan view. An opening portion 71 is provided in the center of the frame portion 70. The opening portion 71 has a generally rectangular shape that is long in the left-right direction in a plan view. A tubular portion 73 is provided along the inner peripheral edge of the opening portion 71. The tubular portion 73 extends upward (downward in Figure 7) from the inner peripheral edge of the opening portion 71. A crimping piece 74 is provided at the upper end of the tubular portion 73.

[0050] Four fixing holes 77 are provided at the front end of the frame 70, spaced apart in the left-right direction. The four fixing holes 77 correspond to the positions of four fixing holes 311 (see FIG. 4) provided on the front end side of the support plate 31 of the burner support base 3. Two fixing holes 76 are provided at the rear end of the frame 70, spaced apart in the left-right direction. The two fixing holes 76 correspond to the positions of two fixing holes 312 provided on the rear end side of the support plate 31.

[0051] The structure of the internal throat section 8 will now be described. As shown in FIG. 7, the internal throat section 8 is formed in a substantially cylindrical shape extending in the left-right direction. The internal throat section 8 has an upstream end section 801 and a downstream end section 802. The upstream end section 801 is the right end section of the internal throat section 8 and is the inlet where gas and air flow in. The downstream end section 802 is the left end section of the internal throat section 8 and is the outlet where gas that flows inside the internal throat section 8 and is mixed with air flows out. The internal throat section 8 gradually expands in diameter from the upstream end section 801 to the downstream end section 802.

[0052] A connecting portion 85 extends toward the left from the center in the front-to-rear direction at the bottom of the downstream end portion 802. The connecting portion 85 is flat and extends in the left-right direction in a plan view. The connecting portion 85 extends parallel to the axial direction of the inner throat portion 8. The connecting portion 85 has a protruding portion 86. The protruding portion 86 is provided along the center line of the connecting portion 85 and protrudes in a direction perpendicular to the axial direction of the inner throat portion 8. The protruding portion 86 extends along the axial direction of the inner throat portion 8. The right end of the protruding portion 86 extends to a position to the right of the downstream end portion 802 of the inner throat portion 8.

[0053] Such protrusion 86 is a drawn portion formed by, for example, pressing a metal plate so as to be recessed in the connecting portion 85 in a direction perpendicular to the axial direction of the inner throat portion 8. Therefore, the protrusion 86 can improve the strength of the connecting portion 85.

[0054] The upper end of the wall portion 82 is connected to the left end of the connecting portion 85. The wall portion 82 has a generally rectangular shape that is long in the front-rear direction when viewed from the left side. The wall portion 82 is positioned to the left of the downstream end 802 of the inner throat portion 8 and is supported with its surface facing in the left-right direction. Therefore, the wall portion 82 is positioned perpendicular to the axial direction of the inner throat portion 8. A fixing portion 83 is provided at the lower end of the wall portion 82. The fixing portion 83 protrudes from the lower end of the wall portion 82 to the left, opposite the inner throat portion 8, and is formed in a rectangular shape in plan view (see Figure 11). The fixing portion 83 has a pair of engagement holes 84 aligned in the front-rear direction. The engagement holes 84 are circular holes. This pair of engagement holes 84 can engage with a pair of protrusions 551 provided on the underside of the bulge portion 55 of the first member 5.

[0055] An example of a method for assembling the afterburner 9 will be described with reference to FIGS. (1st step) As shown in FIG. 7, with the first member 5 turned upside down, the inner throat portion 8 is positioned inside the bulge portion 56 of the first member 5. At this time, as shown in FIG. 8, the upstream end portion 801 of the inner throat portion 8 is abutted against the step portion 59 from the left. Furthermore, a pair of engagement holes 84 provided in the fixing portion 83 of the inner throat portion 8 are engaged with a pair of protrusions 551 provided in the bulge portion 55. This positions the inner throat portion 8 inside the first main body forming portion 52. In this state, the fixing portion 83 is spot welded to the bulge portion 55 at one point. This stably fixes the inner throat portion 8 to the inside of the first main body forming portion 52.

[0056] (2nd process) Furthermore, in a step separate from the first step, the fixing flange 7 is fixed to the second member 6. Here, the crimping pieces 74 of the fixing flange 7 are inserted into the inside of the opening 63 of the second member 6. Then, the crimping pieces 74 are folded back from the inside to the outside relative to the inner edge of the opening 63, and the entire circumference is crimped (see FIG. 13). As a result, the fixing flange 7 is fixed to the second member 6, as shown in FIG.

[0057] (3rd step) Then, the first member 5 (see FIG. 8), to which the inner throat portion 8 has been fixed in the first step, and the second member 6 (see FIG. 9), to which the fixing flange 7 has been fixed in the second step, are aligned in the vertical direction. Next, the first member 5 is inserted inside the crimping pieces 69 of the second member 6, and the outer circumferential portion 58, front end portion 571, and rear end portion 572 of the first member 5 and the outer circumferential portion 68, front end portion 671, and rear end portion 672 of the second member 6 are brought into contact with each other.

[0058] At this time, the inner throat portion 8 is inserted inside the bulging portion 65 of the second member 6, and the upstream end portion 801 of the inner throat portion 8 is abutted against the step portion 66 from the left. This positions the inner throat portion 8 with respect to the bulging portion 65 of the second main body forming portion 62. In this state, the crimping pieces 69 of the second member 6 are bent inward and crimped to the outer circumferential portion 58, front end portion 571, and rear end portion 572 of the first member 5 (see FIG. 14). This fixes the first member 5 and the second member 6 to each other (see FIGS. 6, 10, and 11).

[0059] (4th step) Finally, the support plate 105 is fixed to the right end of the first throat forming portion 51. At this time, the pair of front and rear claws 106 provided on the support plate 105 are fixed to the second throat forming portion 51 with the front end portion 571 and the rear end portion 572 of the first throat forming portion 51 sandwiched between them. 1 is crimped to the front end 671 and the rear end 672 of the burner assembly 100 (see FIG. 5).

[0060] 13, in the completed burner assembly 100, the recess 54 provided in the first member 5 and the recess 64 provided in the second member 6 are fitted together to form the outer throat 101. Then, the step 59 provided in the first member 5 and the step 66 provided in the second member 6 are fitted together to form the annular step 150. The diameter of the step 150 increases on the side of the bulges 56, 65 by the thickness of the inner throat 8.

[0061] In this configuration, by positioning the upstream end 801 of the inner throat 8 on the step 150, the inner surfaces of the inner throat 8 and the outer throat 101 can be aligned with imaginary lines L1 and L2 when the burner assembly 100 is viewed in cross section. The imaginary lines L1 and L2 are straight lines that extend along the inner surface of the outer throat 101. Therefore, the afterburner 9 can prevent a step from occurring at the boundary between the inner surfaces of the inner throat 8 and the outer throat 101. The upstream end 801 of the inner throat 8 can be brought into close contact with the downstream end of the outer throat 101.

[0062] The flow of gas in the afterburner 9 will be described with reference to Figures 12 and 15. As shown in Figure 12, gas is supplied from a nozzle (not shown) of a gas pipe supported on a support plate 105 toward a gas inlet 115 of the outer throat 101 of the afterburner 9. As the gas flows into the gas inlet 115, air is taken into the gas inlet 115 from the surrounding area. The gas and air that flow in from the gas inlet 115 flow to the left through the outer throat 101. The flow velocity increases as the flow path area narrows in the reduced diameter section 112. The gas with increased flow velocity flows into the inner throat 8 while being mixed with the air.

[0063] As described above, at the stepped portion 150, there is no step at the boundary between the inner surface of the inner throat portion 8 and the inner surface of the outer throat portion 101. Therefore, the afterburner 9 can smoothly introduce gas and air into the inner throat portion 8. This prevents turbulence of the gas and air from occurring inside the inner throat portion 8.

[0064] 15, the mixed gas of gas and air that flows leftward inside the inner throat 8 flows out from the downstream end 802 into the inside of the burner body 102. The protrusion 86 provided on the connecting part 85 makes it easier for the mixed gas to flow in a direction away from the axial center of the inner throat 8 before coming into contact with the wall 82. This makes it possible to more evenly distribute the mixed gas inside the burner body 102.

[0065] In addition, in this embodiment, the wall 82 is disposed downstream of the internal throat 8. However, if the wall 82 were not present, the mixed gas would not reach the upstream side of the burner body 102 as easily, potentially resulting in uneven distribution of the mixed gas. By disposing the wall 82 in this embodiment, a portion of the mixed gas hits the wall 82 and flows back upstream. This limits the amount of mixed gas flowing to the far side of the burner body 102 while facilitating the flow of the mixed gas upstream of the burner body 102. Furthermore, the wall 82 slows the velocity of the mixed gas flowing from the internal throat 8, preventing the mixed gas from overflowing in the axial direction. This results in a uniform distribution of the mixed gas inside the burner body 102, ensuring that the mixed gas is supplied to the combustion bodies 91 and 92 without uneven distribution. Therefore, the afterburner 9 can form a uniform flame on the combustion surface 93.

[0066] In the afterburner 9 of this embodiment, the inner throat portion 8 is fixed to the inside of the burner body 102, so that gas can be prevented from leaking from the gap between the inner throat portion 8 and the burner body 102.

[0067] In the above description, the grill device 1 is an example of the "cooking device" of the present invention.

[0068] As described above, the afterburner 9 of the above embodiment burns off oily smoke and odorous components contained in the combustion exhaust of the grill burner installed in the grill chamber 2. The afterburner 9 includes an outer throat 101, a burner body 102, and an inner throat 8. The outer throat 101 is cylindrical and takes in gas and air from the outside. The burner body 102 extends from the downstream end of the outer throat 101 in an axial direction coaxial with the outer throat 101. The burner body 102 includes a combustion surface 93 that receives gas and air flowing from the outer throat 101 and combusts the gas-air mixture to form a flame. The inner throat 8 is cylindrical, fixed inside the burner body 102, and extends in an axial direction coaxial with the outer throat 101. Inside such a burner body 102, the inner throat 8 is fixed so that its upstream end 801 is in close contact with the downstream end of the outer throat 101. The internal spaces of the inner throat 8 and the outer throat 101 communicate with each other.

[0069] In this way, because the inner throat portion 8 is fixed inside the burner body 102, the afterburner 9 can prevent gas from leaking from the gap between the inner throat portion 8 and the burner body 102. Therefore, this embodiment does not require any process or management to ensure the sealing performance of the afterburner 9, thereby improving the productivity of the afterburner 9. In addition, because the outer throat portion 101 and the inner throat portion 8 are arranged coaxially, the afterburner 9 can be made compact.

[0070] The present invention is not limited to the above embodiment, and various modifications are possible. The above embodiment is a grill device 1, but the present invention can also be applied to any cooking device equipped with a grill chamber 2, such as a table stove or a built-in stove.

[0071] In the above embodiment, the grill burners in the grill chamber 2 are composed of the upper burner 21 and a pair of left and right lower burners 23, 24, but for example, the upper burner 21 may be omitted. There are no limitations on the number and positions of the grill burners.

[0072] Inside the afterburner 9, a wall 82 perpendicular to the axial direction is provided downstream of the downstream end 802 of the inner throat 8; however, the wall 82 need only intersect the axial direction and need not be perpendicular. The protrusion 86 provided on the connecting portion 85 is a drawn portion formed by pressing, but other processing methods may be used. For example, a rib-shaped protrusion may be fixed by welding or the like. The protrusion 86 may also be omitted. The connecting portion 85 extends leftward from the center in the front-to-rear direction below the downstream end 802 of the inner throat 8; however, it may extend leftward from any point on the downstream end 802. The fixing portion 83 of the inner throat 8 is fixed to the bulge 55 at a single spot, but other methods of fixing may also be used. [Explanation of symbols]

[0073] 1 Grilling device 2 Grill compartment 5 First member 6 Second member 8 Inner throat 9 Afterburner 10 Exhaust duct 21 Upper burner 23,24 Lower burner 51 First throat forming part 52 First body forming part 54 Recess 55,56 bulge 59,66 Stepped section 61 Second throat forming part 62 Second body forming part 64 recess 65 Bulge 82 Wall section 83 Fixed part 85 Connection 86 Protrusion 93 Burning Surface 101 External throat 102 Burner body

Claims

1. An afterburner that burns off oily smoke and odorous components contained in the combustion exhaust of the burner, A cylindrical outer throat portion that takes in gas and air from the outside, a burner body including a combustion surface extending from a downstream end of the outer throat in an axial direction coaxial with the outer throat, receiving the gas and air flowing from the outer throat, and combusting the mixed gas of the gas and air to form a flame; a cylindrical inner throat portion fixed to the inside of the burner body and extending in the axial direction coaxially with the outer throat portion; Equipped with Inside the burner body, the upstream end of the inner throat portion is fixed so as to be in close contact with the downstream end of the outer throat portion, The internal spaces of the inner throat portion and the outer throat portion communicate with each other. Afterburner features.

2. A wall portion intersecting the axial direction is provided downstream of the downstream end of the inner throat portion.

2. The afterburner according to claim 1, wherein:

3. a connecting portion is provided between the downstream end portion of the inner throat portion and the wall portion, the connecting portion extending along the axial direction and connecting the downstream end portion of the inner throat portion and the wall portion, the connecting portion is provided with a protruding portion that protrudes in a direction intersecting the axial direction of the inner throat portion, The protrusion extends along the axial direction.

3. The afterburner according to claim 2, wherein:

4. The wall portion is provided with a fixing portion that is fixed to the inside of the burner body.

4. The afterburner according to claim 3, wherein:

5. The protrusion is a throttle portion formed by being recessed in a direction intersecting the axial direction of the inner throat portion in the connecting portion.

5. The afterburner according to claim 4, wherein:

6. The afterburner is The first member is arranged on one side in a thickness direction intersecting the axial direction, and the second member is arranged on the other side opposite to the one side and is coupled to the first member, Each of the first member and the second member is a throat forming portion having a semi-cylindrical recess, the throat forming portion being a portion that forms the outer throat portion; a body forming portion that forms the burner body and has bulging portions that bulge in directions away from each other in the thickness direction; Equipped with the inner throat portion is disposed inside the bulging portion of each of the first member and the second member when the first member and the second member are combined with each other, Between the bulging portion and the downstream end of the outer throat portion, a step portion is provided, the diameter of which increases on the bulging portion side by the thickness of the inner throat portion.

2. The afterburner according to claim 1, wherein:

7. A grill chamber equipped with a burner; An exhaust duct that communicates with the rear of the grill chamber and discharges the combustion exhaust of the burner flowing from inside the grill chamber to the outside of the grill chamber; an afterburner that is attached to the exhaust duct on the upstream side of the combustion exhaust gas flow and burns off oily smoke and odorous components contained in the combustion exhaust gas; In a cooking device comprising: The afterburner is A cylindrical outer throat portion that takes in gas and air from the outside, a burner body including a combustion surface extending from a downstream end of the outer throat in an axial direction coaxial with the outer throat, receiving the gas and air flowing from the outer throat, and combusting the mixed gas of the gas and air to form a flame; a cylindrical inner throat portion fixed to the inside of the burner body and extending in the axial direction coaxially with the outer throat portion; Equipped with Inside the burner body, the upstream end of the inner throat portion is fixed so as to be in close contact with the downstream end of the outer throat portion, The internal spaces of the inner throat portion and the outer throat portion communicate with each other. A heating and cooking device characterized by the above.

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