Gas burner and heating cooker mounted with gas burner

Abstract

To suppress backlash of a regulator mounted to an end part on an inflow port side of a mixing pipe made by casting in a gas burner.SOLUTION: A regulator 25 in which an air port 25a is provided on a plane part 25b covering an inflow port is mounted to an end part of the inflow port 20a side of a mixing pipe 20, and fuel gas is injected from a nozzle toward the inflow port. The mixing pipe is divided into a lower member and an upper member, each of which is formed by casting. An outer edge 21b at an end part on the inflow port side of the lower member has a width in a right / left direction that becomes smaller from an upper end toward a lower end, and protrudes to the nozzle side in an inclined manner. An outer edge 22b at an end part on the inflow port side of the upper member has a width in the right / left direction that becomes smaller from a lower end toward an upper end, and protrudes to the nozzle side in an inclined manner. An approximately horizontal flat part 22c is provided in at least one of the lower end of the outer edge at the end part on the inflow port side of the lower member and an upper end of the outer edge at the end part of the inflow port side of the upper member.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a gas burner that burns a mixture of fuel gas and air that is mixed through a mixing tube. [Background technology]

[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 having one end connected to the burner body and an inlet opening at the other end. When fuel gas is injected toward the inlet of the mixing tube from a nozzle at the end of a gas supply tube that supplies the fuel gas, the fuel gas flows into the mixing tube while sucking in the surrounding air. Then, the mixture of fuel gas and air mixed through the mixing tube is ejected from the flame port of the burner body, and the mixed gas starts to burn when ignited. In addition, when the inflow amount of air is adjusted according to the type of fuel gas, a regulator having an air port of a size according to the type of fuel gas is attached to the inlet side end of the mixing tube to cover the inlet.

[0003] Furthermore, in such gas burners, the mixing tube may be 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 and upper members are each formed by die casting, and the mixing tube is constructed by overlapping the upper member on the lower member. In this case, in consideration of productivity, it is common to prepare a pair of upper and lower dies for the lower member and a pair of upper and lower dies for the upper member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-95137 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a regulator is attached to the inlet side end of a mixing tube formed by die casting as described above, there is a problem that the regulator becomes loose, causing fluctuations in the amount of air flowing in and destabilizing combustion in the gas burner. This is due to the following reasons. First, the die casting mold has a draft gradient to facilitate demolding. For example, if the outer edge of the inlet side end of the lower member of the mixing tube is a lower semicircle, the draft gradient of the pair of upper and lower molds will result in a shape in which the lower end of the lower semicircle protrudes toward the nozzle more than the upper end of the lower semicircle. Similarly, if the outer edge of the inlet side end of the upper member of the mixing tube is an upper semicircle, the draft gradient of the pair of upper and lower molds will result in a shape in which the upper end of the upper semicircle protrudes toward the nozzle more than the lower end of the upper semicircle. Then, when the upper member is superimposed on the lower member, the upper and lower ends of the approximately circular outer edge of the inlet side end of the mixing tube protrude toward the nozzle more than the left and right ends. For this reason, when the regulator is attached to the inlet end of the mixing tube, the flat surface covering the inlet comes into contact with both the top and bottom ends at two points, and the regulator rotates (swings) around the vertical axis connecting these two points, causing rattling.

[0006] The present invention has been made in response to the above-mentioned problems in the conventional technology, and aims to provide a technology that can suppress rattling of a regulator when the regulator is attached to the inlet end of a mixing tube formed by casting in a gas burner. [Means for solving the problem]

[0007] In order to solve the above problems, the gas burner of the present invention adopts the following configuration. A gas burner comprising a burner body having a flame port, and a mixing tube having one end connected to the burner body and an inlet opening at the other end, in which a mixed gas of fuel gas injected from a nozzle at the tip of a gas supply tube toward the inlet and air flowing into the inlet as the fuel gas is injected is supplied to the burner body through the mixing tube, and the mixed gas injected from the flame port is combusted, a lower member formed by casting and constituting a lower side of the mixing tube; an upper member formed by casting separately from the lower member and overlapping the lower member to form an upper side of the mixing tube; a regulator attached to an end of the mixing tube on the inlet side, the regulator having an air port on a flat surface covering the inlet for adjusting the amount of air flowing in; Equipped with The outer edge of the lower member at the inlet side end portion has a width that decreases from the upper end to the lower end thereof and is inclined toward the nozzle side, The outer edge of the upper member at the inlet side end portion has a width that decreases from the lower end to the upper end thereof and is inclined toward the nozzle side, At least one of a lower end of an outer edge of the lower member at the end portion on the inlet side and an upper end of an outer edge of the upper member at the end portion on the inlet side is provided with a substantially horizontal flat portion. It is characterized by:

[0008] In such a 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 of the inlet side of the mixing tube is not a point contact but a substantially horizontal line contact by the flat portion. This makes it difficult for the regulator to rotate around a vertical axis connecting the two points, as occurs in the case of point contact between the top and bottom, and therefore makes it possible to suppress rattling of the regulator. As a result, the amount of air flowing into the air port of the regulator is stabilized, making it possible to maintain the combustion performance of the gas burner.

[0009] In the gas burner of the present invention described above, flat portions may be provided on both the lower end of the outer edge at the inlet side end of the lower member and the upper end of the outer edge at the inlet side end of the upper member.

[0010] In a gas burner configured in this manner, the flat surface of the regulator contacts the inlet end of the mixing tube along two parallel straight lines, one above and one below. This increases the contact between the flat surface of the regulator and the inlet end of the mixing tube compared to when there is line contact on only one side, either above or below, making it possible to further suppress rattling of the regulator.

[0011] The gas burner of the present invention described above may also be configured as follows: First, the regulator extends from the outer edge of the flat portion covering the inlet toward the mixing tube, and has a cylindrical portion surrounding the outer periphery of the mixing tube near the end of the inlet side. Then, on at least one of the left and right sides of the outer periphery of the mixing tube, a convex portion is provided that abuts against the end face of the cylindrical portion opposite the flat portion in the extending direction of the cylindrical portion when the regulator is attached.

[0012] In a gas burner configured in this manner, by providing a contact point between the convex portion and the end face of the cylindrical portion on at least one of the left and right sides of the outer periphery of the mixing tube, rotation of the regulator about an axis in the vertical direction is prevented, thereby making it possible to further suppress rattling of the regulator.

[0013] The gas burner of the present invention may be mounted on a cooking device, and a cooking vessel may be heated by combustion in the gas burner.

[0014] In such a cooking device, by suppressing the rattle of the regulator attached to the end of the inlet side of the mixing tube of the installed gas burner, the amount of air flowing into the air port of the regulator is stabilized, and the combustion performance of the gas burner can be maintained. As a result, it is possible to ensure stable cooking performance as a cooking device. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing the appearance of a gas stove 1 as an example of a cooking device equipped with a gas burner 10 of the present embodiment. [Diagram 2] 1 is a vertical cross-sectional view showing the general structure of a gas burner 10 of the present embodiment. [Diagram 3] 1 is an explanatory diagram showing an example in which rattling occurs in a regulator 25 attached to an expanded diameter portion 20b of a die-cast mixing tube 20. FIG. [Figure 4] 1 is a perspective view showing a mixing tube 20 in a gas burner 10 of a first embodiment. [Diagram 5] FIG. 2 is a perspective view showing a mixing tube 20 in a gas burner 10 as a modified example of the first embodiment. [Figure 6] FIG. 4 is an explanatory diagram showing a mixing tube 20 in a gas burner 10 according to a second embodiment. [Figure 7] FIG. 11 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 8] FIG. 1 is an explanatory diagram showing a mixing tube 20 of a gas burner 10 in which the configuration of the first embodiment and the configuration of the second embodiment are combined. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] 1 is a perspective view showing the appearance of a gas stove 1 as an example of a cooking device equipped with a gas burner 10 of this embodiment. The illustrated gas stove 1 comprises a shallow box-shaped stove body 2 with an open top, and a top plate 3 placed on the stove body 2 and covering the top surface of the stove body 2. Two gas burners 10 are arranged on the left and right sides of the stove body 2, and the tops of the gas burners 10 protrude from insertion holes formed in the top plate 3.

[0017] A trivet 4 is provided on the top plate 3 above the gas burner 10 for placing cooking vessels such as pots. As shown in the figure, the trivet 4 has a plurality of (six in this embodiment) claws 4b radially supported by an annular frame 4a that surrounds the gas burner 10 and is placed on the top plate 3. A cooking vessel is placed on the top surface of these claws 4b, and the cooking vessel is heated by burning a mixture of fuel gas and air with the gas burner 10. In addition, on the front side of the top plate 3, there are provided operation knobs 5 that correspond to each of the two gas burners 10 and are operated by the user when igniting, extinguishing, or adjusting the flame power. When the operation knob 5 is pressed down and rotated from the initial position in a predetermined direction (counterclockwise in this embodiment), fuel gas is supplied to the gas burner 10 and the gas burner 10 is ignited by an ignition plug (not shown). Thereafter, by changing the rotation angle of the operating knob 5, the amount of fuel gas supplied is changed, thereby adjusting the flame power of the gas burner 10, and by returning the operating knob 5 to its initial position, the supply of fuel gas to the gas burner 10 is stopped, resulting in extinguishing.

[0018] 2 is a vertical cross-sectional view showing the general structure of the gas burner 10 of this embodiment. First, the gas burner 10 has an annular mixing chamber 13 formed between a substantially cylindrical burner body 11 and a substantially cylindrical central cylinder 12 arranged inside the burner body 11. The bottom surface of this mixing chamber 13 is closed by a bottom plate 14 provided integrally with the lower end side of the central cylinder 12, and the upper opening is covered by a substantially circular burner cap 15. The burner body 11, the bottom plate 14 integral with the central cylinder 12, and the burner cap 15 of this embodiment are each formed by die casting using an aluminum alloy.

[0019] At the upper end side of the burner body 11, a mounting surface 11a of a substantially annular shape is formed, projecting inward, and a burner cap 15 is mounted on this mounting surface 11a. The burner cap 15 has a substantially cylindrical tubular wall 15a extending downward from the outer edge portion, and a plurality of grooves 15b are formed radially from the center of the tubular wall 15a at the lower end surface (the surface that abuts against the mounting surface 11a). The tubular wall 15a on the left side in the cross-sectional view of Fig. 2 represents a cross section cut at a position where the grooves 15b are not present, and the tubular wall 15a on the right side represents a cross section cut at the position of the grooves 15b.

[0020] When the burner cap 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 in the cylindrical wall 15a and the mounting surface 11a of the burner body 11. In addition, a substantially annular joint wall 15c is suspended from the lower surface of the burner cap 15, and when the burner cap 15 is placed on the burner body 11, the joint wall 15c is fitted into the upper inside of the central cylinder 12. The burner body 11, the central cylinder 12, the bottom plate 14, and the burner cap 15 in this embodiment correspond to the "burner body" of the present invention.

[0021] One end of the mixing tube 20 is connected to the burner body 11 and the bottom plate 14 while communicating with the mixing chamber 13, and an inlet 20a is opened at the other end of the mixing tube 20. The mixing tube 20 of this embodiment is made by die casting using an aluminum alloy, and is configured so as to be separable into upper and lower parts as described later. The lower part is formed integrally with the central cylinder 12 and the bottom plate 14, and the upper part is formed integrally with the burner body 11.

[0022] At the end of the inlet 20a side of the mixing tube 20, as shown in the figure, there is provided an expanded diameter section 20b in which both the outer diameter and the inner diameter are expanded, and the inlet 20a opens at the end of the expanded diameter section 20b. In addition, a nozzle 31 is provided at the tip of a gas supply pipe 30 that supplies fuel gas, and this nozzle 31 is installed facing the inlet 20a of the mixing tube 20. When the fuel gas is injected from the nozzle 31 toward the inlet 20a, it flows into the mixing tube 20 while sucking in the surrounding air due to the ejector effect. Then, the mixed gas of the fuel gas and air mixed through the mixing tube 20 is supplied to the mixing chamber 13 and ejected from the multiple flame ports 16, and when a spark is thrown by an ignition plug (not shown), the mixed gas starts to burn.

[0023] Furthermore, a regulator 25 is attached to the end (expanded diameter portion 20b) of the mixing tube 20 on the inlet 20a side to adjust the amount of air flowing into the mixing tube 20 depending on the type of fuel gas. The regulator 25 is provided with a flat portion 25b formed in a substantially annular shape having an air port 25a in the center having a size depending on the type of fuel gas, which covers the inlet 20a, and a tubular portion 25c of a substantially cylindrical shape that extends from the outer edge of the flat portion 25b to the mixing tube 20 side and surrounds the outer periphery of the expanded diameter portion 20b. The regulator 25 of this embodiment is formed by sheet metal processing using a thin plate such as stainless steel. In addition, since it is necessary to replace the regulator 25 depending on the type of fuel gas, the diameter of the tubular portion 25c is set to be large so that the fitting of the tubular portion 25c to the outer periphery of the expanded diameter portion 20b becomes loose.

[0024] However, when the regulator 25 is attached to the expanded diameter portion 20b of the die-cast mixing tube 20, rattling may occur in the regulator 25, causing fluctuations in the amount of air flowing in and destabilizing combustion in the gas burner 10. Below, the configuration adopted in the gas burner 10 of this embodiment to suppress rattling of the regulator 25 will be explained, but in preparation for this, the reason why rattling occurs in the regulator 25 will first be explained.

[0025] FIG. 3 is an explanatory diagram showing an example in which rattling occurs in the regulator 25 attached to the enlarged diameter portion 20b of the die-cast mixing tube 20. First, FIG. 3(a) shows a perspective view of the mixing tube 20 in an exploded state. As described 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. The lower member 21 does not necessarily have to be integral with the central tube 12 and the bottom plate 14, and may be formed as a single member. Similarly, the upper member 22 does not necessarily have to be integral with the burner body 11, and may be formed as a single member. In FIG. 3(a), the lower member 21 and the upper member 22 are each shown as a single member.

[0026] As shown in the figure, the lower member 21 is provided with lower flange portions 21a on both sides along the axial direction of the mixing tube 20, and is provided with a lower expanded diameter portion 21b constituting the lower side of the expanded diameter portion 20b at the end on the inlet 20a side (right side in the figure), with the outer edge of the lower expanded diameter portion 21b being approximately semicircular in shape. Similarly, the upper member 22 is provided with upper flange portions 22a on both sides along the axial direction of the mixing tube 20, and is provided with an upper expanded diameter portion 22b constituting the upper side of the expanded diameter portion 20b at the end on the inlet 20a side, with the outer edge of the upper expanded diameter portion 22b being approximately semicircular in shape.

[0027] When the lower member 21 and the upper member 22 are formed by die casting, a pair of upper and lower dies is generally prepared for the lower member 21 and a pair of upper and lower dies is generally prepared for the upper member 22 in consideration of productivity. In addition, the die casting dies are provided with a draft gradient to facilitate demolding. For example, in the lower member 21, the draft gradient of the pair of upper and lower dies causes the outer edge of the end of the lower enlarged diameter portion 21b to be inclined toward the nozzle 31 side (the right side in the figure) as it moves from the upper end to the lower end of the approximately lower semicircular shape. Similarly, in the upper member 22, the draft gradient of the pair of upper and lower dies causes the outer edge of the end of the upper enlarged diameter portion 22b to be inclined toward the nozzle 31 side as it moves from the lower end to the upper end of the approximately upper semicircular shape.

[0028] 3(b), the mixing tube 20 is constructed by overlapping the lower flange portion 21a of the lower member 21 with the upper flange portion 22a of the upper member 22 and fastening them together with rivets, screws, etc. Then, the outer edge of the end of the expanded diameter section 20b becomes approximately circular, and both the upper and lower ends of the approximately circular outer edge protrude further toward the nozzle 31 than the left and right ends. Therefore, when the regulator 25 is attached to the expanded diameter section 20b of the mixing tube 20, the flat portion 25b of the regulator 25 covering the inlet 20a comes into contact with the upper and lower ends of the approximately circular outer edge at two points at the end of the expanded diameter section 20b, as shown by the dashed circle in the figure.

[0029] In this state where the flat portion 25b of the regulator 25 contacts the end of the enlarged diameter portion 20b at two points, upper and lower, as shown in Fig. 3(c), the regulator 25 rotates (swings) around the vertical axis connecting these two points, causing rattling. 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 enable replacement of the regulator 25 depending on the type of fuel gas, etc., it is necessary to ensure a margin (gap) for the fitting between the outer periphery of the enlarged diameter portion 20b and the cylindrical portion 25c. Therefore, in the gas burner 10 of this embodiment, the following configuration is adopted to suppress rattling of the regulator 25.

[0030] 4 is a perspective view showing the mixing tube 20 in the gas burner 10 of the first embodiment. In the figure, the expanded diameter portion 20b of the mixing tube 20 is shown enlarged before the regulator 25 is attached. As shown in the figure, the upper member 22 of the mixing tube 20 of the first embodiment is provided with a substantially horizontal flat portion 22c at the upper end of the outer edge of the upper expanded diameter portion 22b.

[0031] Due to such flat portion 22c, the outer edge of the terminal end of upper expanded diameter portion 22b has a shape of a substantially upper semicircle with the upper part cut substantially horizontally, and the upper end becomes a substantially horizontal straight line as shown by the dashed ellipse in the drawing. Therefore, when regulator 25 is attached, flat portion 25b contacts the upper side of the terminal end of expanded diameter portion 20b as a line rather than a point.

[0032] In this way, by making the contact between the upper side of the flat portion 25b of the regulator 25 and the end of the enlarged diameter portion 20b be a substantially horizontal line contact, the regulator 25 is less likely to rotate about an axis in the vertical direction as shown in Fig. 3(c), thereby suppressing rattling of the regulator 25. As a result, the amount of air flowing into the air port 25a of the regulator 25 is stabilized, and the combustion performance of the gas burner 10 can be maintained.

[0033] In the above description, the flat portion 22c is provided on the upper expanded diameter portion 22b of the upper member 22, but instead of the upper member 22, a substantially horizontal flat portion 21c may be provided on the lower end of the outer edge of the lower expanded diameter portion 21b of the lower member 21. Naturally, the same effect can be obtained even if the upper and lower portions are reversed in this way.

[0034] 5, a flat portion 22c may be provided on the upper expanded diameter portion 22b of the upper member 22, and a flat portion 21c may also be provided on the lower expanded diameter portion 21b of the lower member 21. In this way, the flat portion 25b of regulator 25 contacts the end of expanded diameter portion 20b with two parallel straight lines, one above the other, and the contact between the flat portion 25b of regulator 25 and the end of expanded diameter portion 20b increases compared to when only one of the upper and lower portions is in line contact, making it possible to further suppress rattling of regulator 25.

[0035] FIG. 6 is an explanatory diagram showing the mixing tube 20 in the gas burner 10 of the second embodiment. First, FIG. 6(a) shows the mixing tube 20 before the regulator 25 is attached, as viewed from the inlet 20a side. As shown in the figure, the mixing tube 20 of the second embodiment has convex parts 20d on both the left and right sides of the outer periphery of the expanded diameter part 20b, and the convex parts 20d shown in the figure extend from the upper flange part 22a of the upper member 22 to the inlet 20a side. Note that, as in the example of FIG. 3(b), the upper and lower ends of the end of the expanded diameter part 20b in the substantially circular outer edge protrude toward the nozzle 31 side (the front side in the figure) beyond the left and right ends.

[0036] When regulator 25 is attached to enlarged diameter section 20b of mixing tube 20, as shown in the perspective view of Figure 6(b), convex portion 20d provided on the outer periphery of enlarged diameter section 20b abuts against the end face opposite to flat portion 25b of cylindrical portion 25c of regulator 25 in the extension direction of cylindrical portion 25c (axial direction of mixing tube 20).

[0037] In the gas burner 10 of the second embodiment, when the flat portion 25b of the regulator 25 is in contact with the end of the expanded diameter portion 20b of the mixing tube 20 at two points, upper and lower, even if the regulator 25 tries to rotate about the vertical axis connecting these two points (see FIG. 3(c)), the regulator 25 is prevented from rotating because the convex portion 20d and the end face of the cylindrical portion 25c have abutting points on the left and right sides intersecting the vertical axis, so that rattling of the regulator 25 can be suppressed. As a result, the amount of air flowing into the air port 25a of the regulator 25 is stabilized, making it possible to maintain the combustion performance of the gas burner 10.

[0038] In the example of Fig. 6 described above, the convex portion 20d is provided on both the left and right sides of the outer periphery of the enlarged diameter portion 20b, but it may be provided on only one of the left and right sides. If the convex portion 20d is provided on either the left or right side of the outer periphery of the enlarged diameter portion 20b, the convex portion 20d abuts against the end face of the cylindrical portion 25c, thereby restricting the range of rotation of the regulator 25 about the vertical axis as shown in Fig. 3(c), thereby obtaining an effect of suppressing rattling of the regulator 25. Naturally, if the convex portion 20d is provided on both the left and right sides of the outer periphery of the enlarged diameter portion 20b as shown in Fig. 6, the rotation of the regulator 25 can be reliably hindered (the rotation range is narrowed) compared to either one side, so that it is possible to enhance the effect of suppressing rattling of the regulator 25.

[0039] 6, the convex portion 20d is provided on the upper member 22, but the present invention is not limited to this, and the convex portion 20d may be provided on the lower member 21. Furthermore, of the pair of left and right convex portions 20d, one may be provided on the lower member 21 and the other on the upper member 22. Furthermore, a portion of the convex portion 20d may be provided on the lower member 21, and the remaining portion of the convex portion 20d may be provided on the upper member 22, so that the convex portion 20d is completed when the upper member 22 is superimposed on the lower member 21.

[0040] The gas burner 10 of the second embodiment also has the following modified example. Fig. 7 is a perspective view showing the mixing tube 20 and the regulator 25 in the gas burner 10 as a modified example of the second embodiment. First, Fig. 7(a) shows a state before the regulator 25 is attached to the enlarged diameter portion 20b of the mixing tube 20. As shown in the figure, the mixing tube 20 of the modified example does not have the convex portion 20d as shown in Fig. 6 on the outer periphery of the enlarged diameter portion 20b. Instead, the regulator 25 has convex portions 25d on both the left and right sides that protrude toward the mixing tube 20 from the end face of the cylindrical portion 25c opposite to the flat portion 25b.

[0041] When the regulator 25 is attached to the enlarged diameter portion 20b of the mixing tube 20, as shown in Figure 7(b), the convex portions 25d protruding from the cylindrical portion 25c of the regulator 25 abut against the lower flange portion 21a and the upper flange portion 22a on both 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).

[0042] In this modified gas burner 10, as in the second embodiment described above, even if the regulator 25 attempts to rotate about the vertical axis connecting the flat portion 25b of the regulator 25 that is in contact with the end of the expanded diameter portion 20b of the mixing tube 20 at two points, one above and one below, the rotation of the regulator 25 is prevented by the presence of abutment points between the convex portion 25d and the flange portions 21a, 22a on the left and right sides that intersect with the vertical axis, and therefore rattling of the regulator 25 can be suppressed.

[0043] In the example shown in Fig. 7, 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, the abutment between the convex portion 25d and the flange portions 21a and 22a limits the range of rotation of the regulator 25 about the vertical axis as shown in Fig. 3(c), thereby obtaining an effect of suppressing rattling of the regulator 25. Of course, if the convex portion 25d is provided on both the left and right sides of the cylindrical portion 25c as shown in Fig. 7, the rotation of the regulator 25 can be reliably hindered (the rotation range is narrowed) compared to either one side, so that it is possible to enhance the effect of suppressing rattling of the regulator 25.

[0044] 7, the protrusion 25d is in contact with both the lower flange portion 21a and the upper flange portion 22a, but it may be in contact with only one of them. Furthermore, one of the pair of left and right protrusions 25d may be in contact with the lower flange portion 21a and the other may be in contact with the upper flange portion 22a.

[0045] The above describes various embodiments and modifications of the gas burner 10. However, the present invention is not limited to the above embodiments and modifications, and can be embodied in various forms without departing from the spirit of the present invention.

[0046] For example, the configuration of the first embodiment and the configuration of the second embodiment may be combined. That is, as shown in FIG. 8, a substantially horizontal flat portion 22c may be provided at the upper end of the outer edge of the upper expanded diameter portion 22b of the upper member 22 of the mixing tube 20, and a convex portion 20d may be provided on both the left and right sides of the outer circumference of the expanded diameter portion 20b. In this way, as described above with reference to FIG. 4, the contact between the flat portion 25b of the regulator 25 and the end of the expanded diameter portion 20b on the upper side becomes a substantially horizontal line contact, so that the regulator 25 is less likely to rotate around the vertical axis as shown in FIG. 3(c), and therefore rattling of the regulator 25 can be suppressed. Moreover, as described above with reference to FIG. 6, the regulator 25 is prevented from rotating by having abutment points between the convex portion 20d and the end face of the cylindrical portion 25c on the left and right sides intersecting the vertical axis, so that rattling of the regulator 25 can be further suppressed.

[0047] In the above-described embodiment and modified example, the outer edge of the lower expanded diameter portion 21b is substantially semicircular at the bottom, and the outer edge of the upper expanded diameter portion 22b is substantially semicircular at the top, and the outer edge of the expanded diameter portion 20b formed by overlapping the two is substantially circular. However, the shape of the outer edge of the expanded diameter portion 20b is not limited to this, and the present invention can be suitably applied as long as the outer edge of the lower expanded diameter portion 21b has a lateral width that decreases from the top to the bottom, and the outer edge of the upper expanded diameter portion 22b has a lateral width that decreases from the bottom to the top. For example, even if the outer edge of the lower expanded diameter section 21b is approximately an inverted triangle and the outer edge of the upper expanded diameter section 22b is approximately a triangle, and the outer edge of the expanded diameter section 20b formed by overlapping these two is approximately diamond-shaped, the upper and lower ends of the outer edge of the approximately diamond shape will protrude more toward the nozzle 31 than the left and right ends due to the draft angle when forming them by die casting, so by applying the configuration of the first embodiment or the configuration of the second embodiment described above, it is possible to suppress rattling of the regulator 25 attached to the expanded diameter section 20b of the mixing tube 20.

[0048] In the above-mentioned embodiment and modified example, the lower member 21 and the upper member 22 are each described as being formed by die casting. However, the method is not limited to die casting, and they may be formed by other casting processes, and the present invention can be suitably applied when the upper and lower ends of the outer edge of the end of the expanded diameter portion 20b are shaped to protrude more toward the nozzle 31 than the left and right ends due to the draft angle of the mold. In addition, the material of the mixing tube 20 is not limited to aluminum alloy, and may be zinc alloy, steel, stainless steel, etc. [Explanation of symbols]

[0049] 1...Gas stove, 2...Stove body, 3...Tabletop, 4... Trivet, 4a... Frame, 4b... Claw, 5...operation knob, 10...gas burner, 11...burner body, 11a: placement surface; 12: central cylinder; 13: mixing chamber; 14... bottom plate; 15... burner cap; 15a... cylindrical wall; 15b...groove, 15c...engaging wall, 16...burning hole, 20...Mixing pipe, 20a...Inlet, 20b...Enlarged diameter part, 20d... protruding 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 enlarged diameter portion, 22c...flat portion, 25...regulator; 25a...air vent; 25b...flat portion; 25c... cylindrical portion, 25d... protruding portion, 30... gas supply pipe, 31...Nozzle.

Claims

1. A gas burner comprising a burner body having a flame port, and a mixing tube having one end connected to the burner body and an inlet opening at the other end, in which a mixed gas of fuel gas injected from a nozzle at the tip of a gas supply tube toward the inlet and air flowing into the inlet as the fuel gas is injected is supplied to the burner body through the mixing tube, and the mixed gas injected from the flame port is combusted, a lower member formed by casting and constituting a lower side of the mixing tube; an upper member formed by casting separately from the lower member and overlapping the lower member to form an upper side of the mixing tube; a regulator attached to an end of the mixing tube on the inlet side, the regulator having an air port on a flat surface covering the inlet for adjusting the amount of air flowing in; Equipped with The outer edge of the lower member at the inlet side end portion has a width that decreases from the upper end to the lower end thereof and is inclined toward the nozzle side, The outer edge of the upper member at the inlet side end portion has a width that decreases from the lower end to the upper end thereof and is inclined toward the nozzle side, At least one of a lower end of an outer edge of the lower member at the end portion on the inlet side and an upper end of an outer edge of the upper member at the end portion on the inlet side is provided with a substantially horizontal flat portion. A gas burner characterized by:

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

3. 2. The gas burner according to claim 1, the regulator has a cylindrical portion extending from an outer edge of the flat portion covering the inlet toward the mixing tube and surrounding an outer periphery of the mixing tube near an end portion on the inlet side, A protrusion is provided on at least one of the left and right sides of the outer periphery of the mixing tube, the protrusion abutting against an end face of the cylindrical portion opposite to the flat portion in the extending direction of the cylindrical portion when the regulator is attached. A gas burner characterized by:

4. A cooking device comprising the gas burner according to any one of claims 1 to 3, and configured to heat a cooking vessel by combustion in the gas burner.

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