Gas burner and heating cooker equipped with gas burner

Abstract

The invention provides a gas burner and a heating cooker equipped with the gas burner, wherein the gas burner suppresses shaking of a regulator installed at the end part of the inflow port side of a cast mixing pipe in the gas burner. A regulator having an air port in a planar portion covering the inflow port is attached to the inflow port-side end of the mixing tube, and fuel gas is injected from the nozzle toward the inflow port. The mixing tube is divided into a lower member and an upper member, which are formed by casting processing, respectively. The outer edge of the end portion of the inflow port side of the lower side member decreases in the left-right width from the upper end toward the lower end and protrudes and inclines toward the nozzle side, and the outer edge of the end portion of the inflow port side of the upper side member decreases in the left-right width from the lower end toward the upper end and protrudes and inclines toward the nozzle side. In addition, at least one of the lower end of the outer edge of the end portion of the inflow port side of the lower side member and the upper end of the outer edge of the end portion of the inflow port side of the upper side member is provided with a substantially horizontal flat portion.

Description

Technical Field

[0001] The present invention relates to a gas burner for burning a mixed gas of fuel gas and air mixed through a mixing tube. Background Art

[0002] Gas burners that burn a mixture of fuel gas and air are widely used and are mounted on gas stoves and the like. Such gas burners generally include: a burner body having a flame port; and a mixing tube, one end of which is connected to the burner body, and an inlet is open at the other end of the mixing tube. If fuel gas is sprayed toward the inlet of the mixing tube from a nozzle at the top of the gas supply tube that supplies fuel gas, the surrounding air is sucked in while the surrounding air flows into the mixing tube. Then, the mixed gas of the fuel gas and air mixed through the mixing tube is ejected from the flame port of the burner body, and the combustion of the mixed gas is started by ignition. In addition, when the inflow of air is adjusted according to the type of fuel gas, a regulator having an air port of a size corresponding to the type of fuel gas is installed at the end of the inlet side of the mixing tube in a manner that covers the inlet.

[0003] Moreover, in such a gas burner, a mixing tube is sometimes formed by casting (die casting). For example, in the gas burner described in Patent Document 1, the mixing tube can be divided into upper and lower parts, and the lower member and the upper member are respectively formed by die casting, so that the upper member overlaps with the lower member to form the mixing tube. In this case, considering productivity, generally a pair of upper and lower molds are prepared for the lower member, and a pair of upper and lower molds are prepared for the upper member.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-95137 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] However, if the regulator is installed at the end of the inlet side of the mixing tube formed by die casting as described above, the regulator will shake, thereby causing the following problem: sometimes the inflow of air changes and the combustion in the gas burner becomes unstable. This is caused by the following reasons. First, the die casting mold is provided with a draft angle for easy demoulding. For example, if the outer edge of the end of the inlet side in the lower member of the mixing tube is in the lower semicircle, the draft angle of the upper and lower pairs of molds is formed so that the lower end of the lower semicircle extends and tilts toward the nozzle side relative to the upper end of the lower semicircle. Similarly, if the outer edge of the end of the inlet side in the upper member of the mixing tube is in the upper semicircle, the draft angle of the upper and lower pairs of molds is formed so that the upper end of the upper semicircle extends and tilts toward the nozzle side relative to the lower end of the upper semicircle. And, if the upper member and the lower member are overlapped, the upper and lower ends of the roughly circular outer edge of the end of the inlet side of the mixing tube extend toward the nozzle side relative to the left and right ends. Therefore, if the regulator is mounted on the end of the mixing tube on the inlet side, the flat surface covering the inlet contacts the upper and lower ends at two points, and the regulator rotates (sways) around the vertical axis connecting the two points, thereby causing shaking.

[0009] The present invention has been made in response to the above-mentioned problems in the prior art, and aims to provide a technique capable of suppressing rattling of the regulator when the regulator is attached to the end portion on the inlet side of a mixing tube formed by casting in a gas burner.

[0010] Solutions for solving problems

[0011] In order to solve the above problems, the gas burner of the present invention adopts the following structure. That is,

[0012] A gas burner, comprising: a burner body having a flame port; and a mixing tube, one end of which is connected to the burner body, and an inlet is open at the other end of the mixing tube, in which a mixed gas of fuel gas ejected toward the inlet from a nozzle at the top end of a gas supply tube and air flowing into the inlet as the fuel gas is ejected is supplied to the burner body through the mixing tube, so that the mixed gas ejected from the flame port is burned, characterized in that

[0013] The gas burner has:

[0014] A lower member formed by casting and constituting the lower side of the mixing tube;

[0015] an upper member which is formed by casting independently of the lower member and overlaps with the lower member to form an upper side of the mixing pipe; and

[0016] a regulator mounted on the end of the mixing tube on the inlet side, and having an air port for adjusting the inflow amount of the air on a flat surface portion covering the inlet,

[0017] The outer edge of the end portion of the lower member on the inlet side has a width that decreases from the upper end toward the lower end, and extends toward the nozzle side and is inclined.

[0018] The outer edge of the end portion of the upper member on the inlet side has a width that decreases from the lower end toward the upper end, and extends toward the nozzle side and is inclined.

[0019] A substantially horizontal flat portion is provided at at least one of a lower end of an outer edge of an end portion of the lower member on the inlet side and an upper end of an outer edge of an end portion of the upper member on the inlet side.

[0020] In the gas burner of the present invention, at least one of the upper and lower contacts between the flat portion of the regulator and the end portion of the inlet side of the mixing tube is not a point contact, but a substantially horizontal line contact based on the flat portion. As a result, the rotation of the regulator centered on the axis connecting the two points in the upper and lower directions is less likely to occur, and thus the shaking of the regulator can be suppressed. As a result, the inflow of air at the air port of the regulator is stable, and the combustion performance in the gas burner can be maintained.

[0021] In the gas burner of the present invention described above, flat portions may be provided at both a lower end of an outer edge of an end portion of the lower member on the inlet side and an upper end of an outer edge of an end portion of the upper member on the inlet side.

[0022] In a gas burner of such a structure, the plane portion of the regulator contacts the end portion of the inlet side of the mixing tube by two parallel straight lines in the upper and lower directions. Compared with the case where only one of the upper and lower directions is in line contact, the contact between the plane portion of the regulator and the end portion of the inlet side of the mixing tube is increased, thereby further suppressing the shaking of the regulator.

[0023] In addition, in the aforementioned gas burner of the present invention, it can also be as follows. First, the regulator has a cylindrical portion, which extends from the outer edge of the planar portion covering the inlet toward the mixing tube side and surrounds the outer periphery of the end of the mixing tube close to the inlet side. In addition, a convex portion is provided on at least one of the left and right sides of the outer periphery of the mixing tube, and the convex portion abuts against the end face of the cylindrical portion on the opposite side to the planar portion in the extension direction of the cylindrical portion when the regulator is installed.

[0024] In the gas burner with such a structure, since at least one of the left and right outer circumferences of the mixing tube has a contact point between the convex portion and the end surface of the cylindrical portion, the rotation of the regulator about the vertical axis is hindered, thereby further suppressing the shaking of the regulator.

[0025] Such a gas burner of the present invention may be mounted on a heating cooker, and a cooking container may be heated by combustion in the gas burner.

[0026] In such a heating cooker, by suppressing the shaking of the regulator installed at the end of the inlet side of the mixing tube in the mounted gas burner, the inflow of air at the air port of the regulator is stabilized, and the combustion performance in the gas burner can be maintained. As a result, the heating cooker can ensure stable cooking performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a perspective view showing the appearance of a gas range 1 as an example of a heating cooker equipped with a gas burner 10 according to the present embodiment.

[0028] Figure 2 It is a longitudinal sectional view showing a schematic structure of the gas burner 10 according to the present embodiment.

[0029] Figure 3 This is an explanatory diagram showing an example in which rattling occurs in the regulator 25 attached to the enlarged diameter portion 20 b of the die-cast mixing tube 20 .

[0030] Figure 4 It is a perspective view showing the mixing pipe 20 in the gas burner 10 according to the first embodiment.

[0031] Figure 5 It is a perspective view showing a mixing pipe 20 in a gas burner 10 as a modified example of the first embodiment.

[0032] Figure 6 It is an explanatory diagram showing a mixing pipe 20 in a gas burner 10 according to a second embodiment.

[0033] Figure 7 It is a perspective view showing a mixing pipe 20 and a regulator 25 in a gas burner 10 as a modified example of the second embodiment.

[0034] Figure 8 This is an explanatory diagram showing a mixing pipe 20 of a gas burner 10 in which the structure of the first embodiment and the structure of the second embodiment are combined.

[0035] Description of Reference Numerals

[0036] 1. Gas stove; 2. Stove body; 3. Top plate; 4. Fire support; 4a. Frame; 4b. Claw; 5. Operation knob; 10. Gas burner; 11. Burner body; 11a. Placement surface; 12. Central tube; 13. Mixing chamber; 14. Bottom plate; 15. Burner cover; 15a. Cylindrical wall; 15b. Groove; 15c. Fitting wall; 16. Flame port; 20. Mixing tube; 20a. Inlet; 20b, expanded diameter portion; 20d, convex portion; 21, lower member; 21a, lower flange portion; 21b, lower expanded diameter portion; 21c, flat portion; 22, upper member; 22a, upper flange portion; 22b, upper expanded diameter portion; 22c, flat portion; 25, regulator; 25a, air port; 25b, plane portion; 25c, cylindrical portion; 25d, convex portion; 30, gas supply pipe; 31, nozzle. DETAILED DESCRIPTION

[0037] Figure 1 1 is a perspective view showing the appearance of a gas stove 1 as an example of a heating cooker equipped with a gas burner 10 of the present embodiment. The illustrated gas stove 1 includes: a stove body 2 having a shallow box shape with an open upper surface; and a top plate 3 placed on the stove body 2 to cover the upper surface of the stove body 2. Two gas burners 10 are arranged on the left and right of the stove body 2, and the upper parts of the gas burners 10 protrude from through holes formed in the top plate 3.

[0038] A fire support 4 is provided on the top plate 3 for placing a cooking vessel such as a pot above the gas burner 10. As shown in the figure, the fire support 4 radially supports a plurality of (six in this embodiment) claws 4b through a circular frame 4a placed on the top plate 3 to surround the gas burner 10. The cooking vessel is placed on the upper surface of these claws 4b, and the cooking vessel is heated by burning a mixed gas of fuel gas and air by the gas burner 10. In addition, on the front side of the top plate 3, corresponding to the two gas burners 10, an operating knob 5 for the user to operate when igniting, extinguishing, or adjusting the heat is provided. If the operating knob 5 is pressed down and rotated in a predetermined direction (counterclockwise in this embodiment) from the initial position, fuel gas is supplied to the gas burner 10, and ignition is performed by a spark plug not shown. Thereafter, by changing the rotation angle of the operating knob 5, the supply amount of fuel gas can be changed to adjust the firepower of the gas burner 10. By returning the operating knob 5 to the initial position, the supply of fuel gas to the gas burner 10 is stopped until the flame is extinguished.

[0039] Figure 21 is a longitudinal sectional view showing the general structure of the gas burner 10 of the present embodiment. First, the gas burner 10 has an annular mixing chamber 13 formed between a roughly cylindrical burner body 11 and a roughly cylindrical central tube 12 disposed inside the burner body 11. The bottom surface of the mixing chamber 13 is closed by a bottom plate 14 integrally provided on the lower end side of the central tube 12, and the upper surface opening is covered by a roughly circular burner cover 15. The burner body 11 of the present embodiment, the bottom plate 14 integrally provided with the central tube 12, and the burner cover 15 are each formed by die casting using an aluminum alloy.

[0040] A mounting surface 11a that extends inward and is roughly annular is formed on the upper end side of the burner body 11, and the burner cover 15 is mounted on the mounting surface 11a. The burner cover 15 has a cylindrical wall 15a that is roughly cylindrical and vertically arranged downward from the outer edge portion, and a plurality of grooves 15b are radially formed with respect to the center of the cylindrical wall 15a on the lower end surface (the surface that contacts the mounting surface 11a). In addition, Figure 2 The left side cylindrical wall 15a in the cross-sectional view shows a cross section cut at a position where there is no groove 15b, and the right side cylindrical wall 15a shows a cross section cut at the position of the groove 15b.

[0041] Furthermore, when the burner cover 15 is placed on the burner body 11, a plurality of flame ports 16 communicating with the mixing chamber 13 are formed by the plurality of grooves 15b of the cylindrical wall 15a and the mounting surface 11a of the burner body 11. In addition, a substantially annular fitting wall 15c is vertically provided from the lower surface of the burner cover 15, and when the burner cover 15 is placed on the burner body 11, the fitting wall 15c is fitted inside the upper portion of the central tube 12. In addition, the burner body 11, the central tube 12, the bottom plate 14, and the burner cover 15 of this embodiment correspond to the "burner body" of the present invention.

[0042] In addition, one end of the mixing tube 20 is connected to the burner body 11 and the bottom plate 14 and communicates with the mixing chamber 13, and the inlet 20a is opened at the other end of the mixing tube 20. The mixing tube 20 of this embodiment is made of die-casting using an aluminum alloy, and can be divided into upper and lower parts as described later, with the lower side being integrally formed with the central tube 12 and the bottom plate 14, and the upper side being integrally formed with the burner body 11.

[0043] An expanded diameter portion 20b having an enlarged outer diameter and an enlarged inner diameter as shown in the figure is provided at the end of the inlet 20a side of the mixing tube 20, and the inlet 20a is opened at the end of the expanded diameter portion 20b. In addition, a nozzle 31 is provided at the top end of the gas supply pipe 30 for supplying fuel gas, and the nozzle 31 is arranged facing the inlet 20a of the mixing tube 20. If the fuel gas is sprayed toward the inlet 20a from the nozzle 31, the surrounding air is sucked in and flows into the mixing tube 20 due to the ejection effect. In addition, the mixed gas of the fuel gas and the air mixed through the mixing tube 20 is supplied to the mixing chamber 13 and ejected from the plurality of flame ports 16. If sparks are splashed by a spark plug not shown in the figure, the combustion of the mixed gas begins.

[0044] Moreover, a regulator 25 for adjusting the amount of air flowing into the mixing tube 20 according to the type of fuel gas, etc. is installed at the end (enlarged diameter portion 20b) on the side of the inlet 20a of the mixing tube 20. The regulator 25 includes: a plane portion 25b, which is formed in a roughly annular shape with an air port 25a of a size corresponding to the type of fuel gas, etc. in the center, and covers the inlet 20a; and a cylindrical portion 25c of a roughly cylindrical shape, which extends from the outer edge of the plane portion 25b to the mixing tube 20 side and surrounds the outer periphery of the enlarged diameter portion 20b. In addition, the regulator 25 of this embodiment is formed by sheet metal processing using a thin plate such as stainless steel. In addition, it is necessary to replace the regulator 25 according to the type of fuel gas, etc., and therefore, the diameter of the cylindrical portion 25c is set larger so that the fitting of the cylindrical portion 25c with respect to the outer periphery of the enlarged diameter portion 20b becomes loose.

[0045] However, if the regulator 25 is mounted on the enlarged diameter portion 20b of the die-cast mixing tube 20, there is a case where the amount of air flowing in the regulator 25 fluctuates and combustion in the gas burner 10 becomes unstable. Hereinafter, the structure adopted in the gas burner 10 of this embodiment to suppress the shaking of the regulator 25 will be described. As a preparation, the reason why the shaking occurs in the regulator 25 will be described first.

[0046] Figure 3 1 is an explanatory diagram showing an example of the occurrence of shaking in the regulator 25 attached to the enlarged diameter portion 20b of the die-cast mixing tube 20. Figure 3 (a) shows a state in which the mixing tube 20 is decomposed in a three-dimensional diagram. As mentioned above, the mixing tube 20 can be divided into upper and lower parts, and the lower member 21 constituting the lower side of the mixing tube 20 is formed integrally with the central tube 12 and the bottom plate 14, and the upper member 22 constituting the upper side of the mixing tube 20 is formed integrally with the burner body 11. In addition, the lower member 21 does not necessarily need to be integrated with the central tube 12 and the bottom plate 14, and can also be formed as a single body. Similarly, the upper member 22 does not necessarily need to be integrated with the burner body 11, and can also be formed as a single body. Figure 3 In (a), the lower member 21 and the upper member 22 are shown as single bodies.

[0047] As shown in the figure, the lower flange portion 21a of the lower member 21 is arranged on both sides along the axial direction of the mixing tube 20, and the lower expanded diameter portion 21b constituting the lower side of the expanded diameter portion 20b is arranged at the end portion on the inlet 20a side (the right side in the figure), and the outer edge of the lower expanded diameter portion 21b is approximately in the lower semicircle. Similarly, the upper flange portion 22a of the upper member 22 is arranged on both sides along the axial direction of the mixing tube 20, and the upper expanded diameter portion 22b constituting the upper side of the expanded diameter portion 20b is arranged at the end portion on the inlet 20a side, and the outer edge of the upper expanded diameter portion 22b is approximately in the upper semicircle.

[0048] When such a lower member 21 and an upper member 22 are formed by die casting, respectively, a pair of upper and lower molds are generally prepared for the lower member 21, and a pair of upper and lower molds are prepared for the upper member 22 in consideration of productivity. In addition, a draft angle for facilitating demoulding is provided in the die casting mold. Therefore, for example, in the lower member 21, due to the draft angle of the upper and lower pair of molds, the outer edge of the end of the lower diameter expansion portion 21b becomes a shape that extends and tilts toward the nozzle 31 side (the right side in the figure) from the upper end of the roughly lower semicircular shape toward the lower end. Similarly, in the upper member 22, due to the draft angle of the upper and lower pair of molds, the outer edge of the end of the upper diameter expansion portion 22b becomes a shape that extends and tilts toward the nozzle 31 side from the lower end of the roughly upper semicircular shape toward the upper end.

[0049] And, if Figure 3 As shown in (b), the mixing tube 20 is formed by overlapping the upper flange portion 22a of the upper member 22 and the lower flange portion 21a of the lower member 21 and fastening them with rivets, screws, etc. As a result, the outer edge of the end of the expanded diameter portion 20b becomes roughly circular, and the upper and lower ends of the roughly circular outer edge extend toward the nozzle 31 side relative to the left and right ends. Therefore, if the regulator 25 is installed on the expanded diameter portion 20b of the mixing tube 20, the plane portion 25b of the regulator 25 covering the inlet 20a contacts the upper and lower ends of the roughly circular outer edge at the end of the expanded diameter portion 20b at two points as shown by the dotted circle mark in the figure.

[0050] In this way, when the flat surface portion 25b of the adjuster 25 contacts the distal end of the enlarged diameter portion 20b at two upper and lower points, Figure 3As shown in (c), the regulator 25 rotates (sways) around the vertical axis connecting the two points, causing shaking. In addition, although the regulator 25 has a cylindrical portion 25c surrounding the outer periphery of the enlarged diameter portion 20b of the mixing tube 20, as described above, in order to be able to replace the regulator 25 according to the type of fuel gas, etc., it is necessary to ensure a margin (gap) in the fit between the outer periphery of the enlarged diameter portion 20b and the cylindrical portion 25c. Therefore, in the gas burner 10 of this embodiment, in order to suppress the shaking of the regulator 25, the following structure is adopted.

[0051] Figure 4 1 is a perspective view showing a mixing tube 20 in a gas burner 10 according to the first embodiment. In the figure, an enlarged diameter portion 20b of the mixing tube 20 before the regulator 25 is installed is shown in an enlarged manner. As shown in the figure, the upper member 22 of the mixing tube 20 according to the first embodiment is provided with a substantially horizontal flat portion 22c at the upper end of the outer edge of the upper enlarged diameter portion 22b.

[0052] By means of such a flat portion 22c, the outer edge of the end of the upper enlarged diameter portion 22b is in a shape in which the upper portion of the upper semicircular part is cut approximately horizontally, and as shown by the dotted ellipse in the figure, the upper end is in a substantially horizontal straight line. Therefore, when the adjuster 25 is installed, the flat portion 25b contacts the upper side of the end of the enlarged diameter portion 20b not in the form of a point but in the form of a line.

[0053] In this way, if the contact between the flat surface portion 25b of the adjuster 25 and the upper side of the distal end of the enlarged diameter portion 20b is set to be substantially horizontal line contact, it is difficult to generate a friction in the adjuster 25. Figure 3 The rotation around the vertical axis as in (c) can suppress the shaking of the regulator 25. As a result, the inflow of air at the air port 25a of the regulator 25 is stabilized, and the combustion performance of the gas burner 10 can be maintained.

[0054] In the above description, the flat portion 22c is provided on the upper enlarged diameter portion 22b of the upper member 22, but a substantially horizontal flat portion 21c may be provided on the lower end of the outer edge of the lower enlarged diameter portion 21b of the lower member 21 instead of the upper member 22. Even if the upper and lower portions are alternately arranged, the same effect can be obtained.

[0055] In addition, as a modified example, Figure 5As shown, the upper expanded diameter portion 22b of the upper member 22 may be provided with a flat portion 22c, and the lower expanded diameter portion 21b of the lower member 21 may also be provided with a flat portion 21c. In this case, the flat portion 25b of the adjuster 25 contacts the end of the expanded diameter portion 20b with two straight lines parallel to the upper and lower sides, and the contact between the flat portion 25b of the adjuster 25 and the end of the expanded diameter portion 20b is increased compared to the case where only one of the upper and lower sides is in line contact, so the shaking of the adjuster 25 can be further suppressed.

[0056] Figure 6 FIG. 2 is an explanatory diagram showing a mixing tube 20 in a gas burner 10 according to a second embodiment. Figure 6 (a) shows the state of the mixing tube 20 before the regulator 25 is installed, as viewed from the inlet 20a side. As shown in the figure, in the mixing tube 20 of the second embodiment, convex portions 20d are provided on both sides of the outer periphery of the expanded diameter portion 20b, and the convex portions 20d shown in the figure extend from the upper flange portion 22a of the upper member 22 toward the inlet 20a side. In addition, the end of the expanded diameter portion 20b is connected to the end of the expanded diameter portion 20b. Figure 3 In the example of (b), the upper and lower ends of the substantially circular outer edge are similarly extended toward the nozzle 31 side (the front side in the figure) relative to the left and right ends.

[0057] Furthermore, when the regulator 25 is mounted on the enlarged diameter portion 20b of the mixing tube 20, Figure 6 (b) is a three-dimensional diagram showing that the convex portion 20d arranged on the outer periphery of the expanded diameter portion 20b abuts against the end surface of the cylindrical portion 25c of the regulator 25 on the opposite side to the flat portion 25b in the extension direction of the cylindrical portion 25c (the axial direction of the mixing tube 20).

[0058] In the gas burner 10 of the second embodiment, when the flat surface 25b of the regulator 25 contacts the distal end of the enlarged diameter portion 20b of the mixing tube 20 at two upper and lower points, even if the regulator 25 is rotated about the vertical axis connecting the two points (see Figure 3 (c)), since there are contact points between the convex portion 20d and the end surface of the cylindrical portion 25c on the left and right sides intersecting the axis in the vertical direction, the rotation of the regulator 25 is also hindered, so that the shaking of the regulator 25 can be suppressed. As a result, the inflow of air at the air port 25a of the regulator 25 is stable, and the combustion performance in the gas burner 10 can be maintained.

[0059] As explained above Figure 6In the example, the convex portion 20d is provided on both the left and right sides of the outer circumference of the enlarged diameter portion 20b, or it may be provided on either side. If the convex portion 20d is provided on either side of the outer circumference of the enlarged diameter portion 20b, the contact between the convex portion 20d and the end surface of the cylindrical portion 25c can be used to limit the Figure 3 (c) The range of rotation of the adjuster 25 about the axis in the vertical direction is as the center, so the effect of suppressing the shaking of the adjuster 25 can be obtained. Figure 6 By providing the convex portions 20d on both left and right sides of the outer periphery of the enlarged diameter portion 20b in advance, the rotation of the adjuster 25 can be reliably hindered (the rotation range can be narrowed) compared to the case where the convex portions 20d are provided on only one side, thereby improving the effect of suppressing the rattling of the adjuster 25.

[0060] In addition, Figure 6 In the example of , the convex portion 20d is provided on the upper member 22, but the present invention is not limited thereto, and the convex portion 20d may be provided on the lower member 21. In addition, one of the pair of left and right convex portions 20d may be provided on the lower member 21, and the other may be provided on the upper member 22. Furthermore, a part of the convex portion 20d may be provided on the lower member 21, and the remaining part of the convex portion 20d may be provided on the upper member 22, and the convex portion 20d may be completed by overlapping the upper member 22 and the lower member 21.

[0061] In addition, the gas burner 10 of the second embodiment also has the following modified examples. Figure 7 2 is a perspective view showing a mixing tube 20 and a regulator 25 in a gas burner 10 as a modified example of the second embodiment. Figure 7 (a) shows a state before the regulator 25 is installed on the enlarged diameter portion 20b of the mixing tube 20. As shown in the figure, in the mixing tube 20 of the modified example, no outer periphery of the enlarged diameter portion 20b is provided. Figure 6 Instead, the regulator 25 is provided with convex portions 25d protruding toward the mixing tube 20 from the end surface of the cylindrical portion 25c on the side opposite to the flat portion 25b on both left and right sides.

[0062] Furthermore, when the regulator 25 is mounted on the enlarged diameter portion 20b of the mixing tube 20, Figure 7 As shown in (b), the convex portion 25d protruding from the cylindrical portion 25c of the regulator 25 abuts against the lower flange portion 21a and the upper flange portion 22a on the left and right sides of the mixing tube 20 in the extension direction of the cylindrical portion 25c (the axial direction of the mixing tube 20).

[0063] In such a modified example of the gas burner 10, as in the aforementioned second embodiment, when the flat portion 25b of the regulator 25 contacts the distal end of the enlarged diameter portion 20b of the mixing tube 20 at two upper and lower points, even if the regulator 25 is to be rotated about the vertical axis connecting the two points, the presence of the convex portion 25d and the flange portions 21a and 22a at the left and right sides intersecting the vertical axis hinders the rotation of the regulator 25, thereby suppressing the shaking of the regulator 25.

[0064] exist Figure 7 In the example shown, the convex portion 25d is provided on both the left and right sides of the cylindrical portion 25c, but it may be provided on only one of the left and right sides. If the convex portion 25d is provided on either the left or right side of the cylindrical portion 25c in advance, the contact between the convex portion 25d and the flange portion 21a and the flange portion 22a can be used to limit the Figure 3 (c) The range of rotation of the regulator 25 is centered on the axis in the vertical direction, so the effect of suppressing the shaking of the regulator 25 can be obtained. Of course, if Figure 7 By providing the convex portions 25d on both the left and right sides of the cylindrical portion 25c in advance, the rotation of the adjuster 25 can be reliably hindered (the rotation range can be narrowed) compared to the case where the convex portions 25d are provided on only one side, thereby improving the effect of suppressing the rattling of the adjuster 25.

[0065] In addition, Figure 7 In the example of, the convex portion 25d abuts both the lower flange portion 21a and the upper flange portion 22a, or may abut only one of them. In addition, one of the left and right convex portions 25d abuts the lower flange portion 21a, and the other abuts the upper flange portion 22a.

[0066] As mentioned above, although the gas burner 10 of various embodiments and modifications was demonstrated, this invention is not limited to the said embodiment and modifications, It can implement in various forms within the range which does not deviate from the summary.

[0067] For example, the structure of the first embodiment and the structure of the second embodiment may be combined. Figure 8 As shown, the substantially horizontal flat portion 22c may be provided at the upper end of the outer edge of the upper enlarged diameter portion 22b in the upper member 22 of the mixing tube 20, and the convex portion 20d may be provided on both sides of the outer periphery of the enlarged diameter portion 20b. Figure 4 As described above, the contact between the flat surface portion 25b of the adjuster 25 and the upper side of the distal end of the enlarged diameter portion 20b becomes a substantially horizontal line contact, so that it is difficult to generate a friction between the adjuster 25 and the upper side of the distal end of the enlarged diameter portion 20b. Figure 3 (c) is a rotation centered on the vertical axis, so the shake of the regulator 25 can be suppressed. Figure 6 As described above, by providing the contact points between the convex portion 20d and the end surface of the cylindrical portion 25c on the left and right sides intersecting the vertical axis, the rotation of the adjuster 25 is hindered, and thus the rattling of the adjuster 25 can be further suppressed.

[0068] In addition, in the above-mentioned embodiment and modification, the outer edge of the lower diameter expansion part 21b is formed into a substantially lower semicircular shape, and the outer edge of the upper diameter expansion part 22b is formed into a substantially upper semicircular shape, so that the outer edge of the diameter expansion part 20b formed by the overlap of the two is formed into a substantially circular shape. However, the shape of the outer edge of the diameter expansion part 20b is not limited to this, and any shape in which the left and right width decreases from the upper end toward the lower end of the outer edge of the lower diameter expansion part 21b, and the left and right width decreases from the lower end toward the upper end of the outer edge of the upper diameter expansion part 22b, can be appropriately applied to the present invention. For example, the outer edge of the lower expanded diameter portion 21b becomes a roughly inverted triangle, and the outer edge of the upper expanded diameter portion 22b becomes a roughly triangular shape. When the outer edge of the expanded diameter portion 20b formed by overlapping the two is made roughly rhombus-shaped, the upper and lower ends of the roughly rhombus-shaped outer edge are shaped to protrude toward the nozzle 31 side relative to the left and right ends due to the draft angle during die casting. Therefore, by applying the structure of the first embodiment and the structure of the second embodiment described above, the shaking of the regulator 25 installed on the expanded diameter portion 20b of the mixing tube 20 can be suppressed.

[0069] In addition, in the above-mentioned embodiment and modification, the lower side member 21 and the upper side member 22 are described as members formed by die casting. However, it is not limited to die casting, and it can also be formed by other casting processes. In the case where the upper and lower ends of the outer edge of the end of the expanded diameter portion 20b are shaped to protrude toward the nozzle 31 side relative to the left and right ends due to the draft angle of the casting mold, the present invention can be appropriately applied. In addition, the material of the mixing tube 20 is not limited to aluminum alloy, and it can also be zinc alloy, steel, stainless steel, etc.

Claims

1. A gas burner comprising: a burner body having a flame port; and a mixing tube, one end of the mixing tube being connected to the burner body, an inlet opening being opened at the other end of the mixing tube, wherein a mixed gas of a fuel gas ejected toward the inlet from a nozzle at the top end of a gas supply tube and air flowing into the inlet along with the ejection of the fuel gas is supplied to the burner body through the mixing tube, so that the mixed gas ejected from the flame port is burned, characterized in that The gas burner has: A lower member formed by casting and constituting the lower side of the mixing tube; an upper member which is formed by casting independently of the lower member and overlaps with the lower member to form an upper side of the mixing pipe; and a regulator mounted on the end of the mixing tube on the inlet side, and having an air port for adjusting the inflow amount of the air on a flat surface portion covering the inlet, The outer edge of the end portion of the lower member on the inlet side has a width that decreases from the upper end toward the lower end, and extends toward the nozzle side and is inclined. The outer edge of the end portion of the upper member on the inlet side has a width that decreases from the lower end toward the upper end, and extends toward the nozzle side and is inclined. A substantially horizontal flat portion is provided at at least one of a lower end of an outer edge of an end portion of the lower member on the inlet side and an upper end of an outer edge of an end portion of the upper member on the inlet side.

2. The gas burner according to claim 1, characterized in that: The flat portion is provided at both a lower end of an outer edge of an end portion of the lower member on the inlet side and an upper end of an outer edge of an end portion of the upper member on the inlet side.

3. The gas burner according to claim 1, characterized in that: The regulator has a cylindrical portion, which extends from the outer edge of the planar portion covering the inlet toward the mixing tube and surrounds the outer periphery of the end portion of the mixing tube close to the inlet. A convex portion is provided on at least one of the left and right sides of the outer circumference of the mixing tube, and the convex portion abuts against an end surface of the cylindrical portion on the opposite side to the flat portion in the extending direction of the cylindrical portion when the regulator is mounted.

4. A heating cooker, wherein: The cooking container is equipped with the gas burner according to any one of claims 1 to 3, and is heated by combustion in the gas burner.

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