Gas burners, and cooking appliances equipped with gas burners

Abstract

When liquid enters the interior of a gas burner through the flame port, with a regulator attached to the inlet end of the mixing tube, this prevents the infiltrating liquid from coming into contact with the nozzle located at the inlet of the mixing tube. [Solution] A nozzle 45 at the tip of a gas supply passage 42 is positioned approximately in the center of the inlet of a mixing pipe 13, which has one end connected to a burner body having a flame port and an inlet 13a opening at the other end. The mixing pipe is also inclined horizontally or downward in its axial direction from the burner body side to the inlet side, and a regulator 15 for adjusting the amount of air flowing in is attached to the inlet end of the mixing pipe. This regulator comprises a flat portion 15a that covers the inlet and a cylindrical portion 15b that extends cylindrically from the outer edge of the flat portion toward the mixing pipe and fits onto the mixing pipe. The flat portion is provided with a main opening 16a that opens approximately in the center of the flat portion and through which the tip of the gas supply passage is inserted, and a secondary opening 16b that opens below the main opening.

Description

Technical Field

[0001] The present invention relates to a gas burner that burns a mixed gas of fuel gas and air mixed through a mixing pipe, and a cooking heater equipped with the gas burner.

Background Art

[0002] A gas burner that burns a mixed gas of fuel gas and air is widely used by being mounted on a cooking heater such as a gas stove. Such a gas burner generally includes a burner body having a flame port, and a mixing pipe having one end connected to the burner body and an inlet opening at the other end. A nozzle at the tip of a gas supply passage for supplying fuel gas is disposed substantially at the center of the inlet, and as the fuel gas is injected from the nozzle into the mixing pipe, air flows into the mixing pipe from around the inlet. Then, the mixed gas of fuel gas and air mixed through the mixing pipe is supplied to the burner body, and the cooking container such as a pot placed above is heated by burning the mixed gas ejected from the flame port.

[0003] Among such gas burners, those in which the axial direction of the mixing pipe is inclined downward from the burner body side toward the inlet side are widespread. Further, when adjusting the amount of air inflow according to the type of fuel gas or the like, a regulator is attached to the end portion on the inlet side of the mixing pipe (for example, Patent Document 1). This regulator is often formed of sheet metal, and has a flat portion covering the inlet, and a cylindrical portion that extends cylindrically from the outer edge of the flat portion toward the mixing pipe side and fits externally onto the mixing pipe. An opening through which the tip side of the gas supply passage is inserted is provided substantially at the center of the flat portion, and the amount of air flowing into the mixing pipe accompanying the injection of fuel gas from the nozzle can be adjusted by the opening area of this opening.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] However, as mentioned above, in gas burners where the regulator is attached to the inlet end of the mixing tube, for example, if liquid spills from the cooking container above, the spilled liquid may enter the interior through the flame port. Since the liquid that enters passes through the mixing tube and is discharged from the opening of the regulator, there is a problem that the liquid may come into contact with the nozzle of the gas supply passage inserted into the opening, blocking the injection hole, or enter the gas supply passage from the injection hole, preventing the fuel gas from being properly injected from the nozzle and causing combustion failure.

[0006] This invention addresses the aforementioned problems in the prior art and aims to provide a technology that can prevent liquid from entering the interior of a gas burner, in which a regulator is attached to the inlet end of the mixing tube, from coming into contact with a nozzle located at the inlet of the mixing tube. [Means for solving the problem]

[0007] To solve the above-mentioned problems, the gas burner of the present invention employs the following configuration: <First aspect> A gas burner comprising a burner body having a flame port, and a mixing tube having one end connected to the burner body and the other end having an inlet, wherein a nozzle at the tip of the gas supply passage for supplying fuel gas is positioned approximately in the center of the inlet, and as the fuel gas is injected from the nozzle into the mixing tube, air flows into the mixing tube from around the inlet, and the mixed gas of the fuel gas and the air mixed through the mixing tube is supplied to the burner body, thereby burning the mixed gas ejected from the flame port, The mixing tube has an axial direction that is inclined horizontally or downward from the burner body side toward the inlet side, and a regulator for adjusting the amount of air flowing in is attached to the end on the inlet side. The regulator comprises a flat portion that covers the inlet and a cylindrical portion that extends cylindrically from the outer edge of the flat portion toward the mixing pipe and fits onto the mixing pipe. The aforementioned flat portion is provided with a main opening located approximately in the center of the flat portion, through which the leading end of the gas supply passage is inserted, and a secondary opening located below the main opening. It is characterized by the following:

[0008] In this first embodiment of the gas burner, even if liquid that has entered the interior from the flame port flows through the mixing tube to the inlet, the liquid is easily discharged from the sub-opening located below the main opening in the approximate center of the flat surface of the regulator. Therefore, compared to the case where there is no sub-opening (liquid is discharged from the main opening), it is possible to make it less likely for liquid to come into contact with the nozzle of the gas supply passage inserted through the main opening. As a result, it is possible to suppress the occurrence of combustion failures in the gas burner caused by liquid blocking the nozzle's injection holes or entering the gas supply passage from the injection holes.

[0009] <Second aspect> In the gas burner of the first embodiment, The aforementioned planar portion is provided with the main opening and the sub-opening connected and forming a single, integrated opening. It is characterized by the following:

[0010] In this second embodiment of the gas burner, particularly when the diameter of the mixing pipe inlet is small and limited, the area of ​​the flat surface covering the inlet is also limited. Therefore, by providing the main opening and the sub-opening as a single unit, it becomes easier to secure a total opening area than if they were provided separately. Furthermore, when assembling the gas burner with the gas supply passage, integrating the main opening and the sub-opening provides a larger opening and facilitates the insertion of the gas supply passage compared to having separate main and sub-openings.

[0011] <Third aspect> In the gas burner of the first or second embodiment, The width of the secondary opening is greater than the outer diameter of the gas supply passage. It is characterized by the following:

[0012] In this third embodiment of a gas burner, if liquid enters the interior from the flame port, the liquid that flows through the mixing pipe towards the inlet side may bounce off the side of the secondary opening in the flat section. By ensuring that the width of the secondary opening is larger than the outer diameter of the gas supply passage, it is possible to suppress the liquid that bounces off the side of the secondary opening from coming into contact with the nozzle of the gas supply passage.

[0013] <Fourth aspect> In any one of the gas burners of the first to third embodiments, The aforementioned secondary opening is located close to the lower end of the inlet. It is characterized by the following:

[0014] In this fourth embodiment of the gas burner, by lowering the position of the secondary opening in the planar section as much as possible, the liquid that flows through the mixing tube to the inlet side is more easily discharged from the secondary opening, and less likely to remain in the mixing tube, thus suppressing liquid accumulation.

[0015] <Fifth aspect> In any one of the gas burners of the first to fourth embodiments, The inlet and the planar portion are substantially circular. When attaching the regulator to the mixing tube, a restricting part is provided to restrict the rotational position of the regulator with respect to the axis of the mixing tube. It is characterized by the following:

[0016] If the rotational position of the regulator around the axis of the mixing tube is not appropriate, and the secondary opening is not located below the main opening (gas supply passage), the effect of discharging the liquid that has flowed through the mixing tube to the inlet side from the secondary opening will be reduced. In the gas burner of the fifth embodiment, the regulator can be attached to the mixing tube at the appropriate rotational position by the regulating part, so that the above effect can be reliably obtained.

[0017] <Aspect 6> Mount any one of the gas burners according to the first to fifth aspects on a cooking appliance, and heat an upper cooking container by combustion of the gas burner.

[0018] In such a cooking appliance, for example, even if a liquid spilled from the cooking container above the gas burner enters the inside of the gas burner from the flame port and flows through the mixing pipe to the inlet side, it is easily discharged from the sub-opening in the flat portion of the regulator. Therefore, it is possible to prevent the liquid from adhering to the nozzle of the gas supply passage. As a result, it is possible to suppress the occurrence of combustion failure of the gas burner caused by the liquid blocking the injection holes of the nozzle or entering the gas supply passage from the injection holes.

Brief Description of the Drawings

[0019] [Figure 1] It is a perspective view showing the appearance of a gas stove 1 as an example of a cooking appliance equipped with the gas burner 10 of this embodiment. [Figure 2] It is a perspective view showing the structure of the gas burner 10 of this embodiment. [Figure 3] It is a perspective view showing the regulator 15 of this embodiment attached to the end on the inlet 13a side of the small mixing pipe 13. [Figure 4] It is an explanatory view showing the flat portion 15a of the regulator 15 attached to the small mixing pipe 13 of this embodiment when viewed from the front. [Figure 5] It is an explanatory view showing the flat portion 15a of the regulator 15 in a modified example when viewed from the front. [Figure 6] It is an explanatory view showing an example in which the main opening 16a and the sub-opening 16b are provided separately in the flat portion 15a of the regulator 15 when the diameter of the inlet 13a of the small mixing pipe 13 is limited to be small.

Modes for Carrying Out the Invention

[0020] Figure 1 is a perspective view showing the external appearance of a gas stove 1 as an example of a cooking appliance equipped with the 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 that rests on the stove body 2 and covers the top surface of the stove body 2. Two gas burners 10 are installed on the left and right sides of the stove body 2, and the upper parts of the gas burners 10 protrude from through holes formed in the top plate 3.

[0021] On the top plate 3, a trivet 4 is installed above the gas burner 10 for placing cooking containers such as pots. As shown in the figure, the trivet 4 has multiple (six in this embodiment) claws 4b radially supported by an annular frame 4a that surrounds the gas burner 10 and is mounted on the top plate 3. Cooking containers are placed on the upper surfaces of these claws 4b, and the cooking containers are heated by burning a mixture of fuel gas and air in the gas burner 10. Also, on the front side of the top plate 3, there are operating knobs 5 corresponding to each of the two gas burners 10, which the user operates when igniting, extinguishing, or adjusting the flame. When the operating knob 5 is pressed down and rotated in a predetermined direction (counterclockwise in this embodiment) from its initial position, fuel gas is supplied to the gas burner 10 and ignited by the spark plug, which will be described later. After that, changing the rotation angle of the control knob 5 changes the amount of fuel gas supplied, thereby adjusting the flame of the gas burner 10. Returning the control knob 5 to its initial position stops the supply of fuel gas to the gas burner 10, extinguishing the flame.

[0022] Figure 2 is a perspective view showing the structure of the gas burner 10 of this embodiment. As shown in the figure, the gas burner 10 has a burner head 20 mounted on a burner body 11 that is roughly cylindrical in shape. One end of two mixing tubes (large mixing tube 12, small mixing tube 13) is connected to the burner body 11, and inlets 12a and 13a open at the other ends of the two mixing tubes 12 and 13, respectively. The burner body 11 and the two mixing tubes 12 and 13 of this embodiment are formed by sheet metal processing using thin sheets of stainless steel or the like, as will be described later. The two roughly parallel mixing tubes 12 and 13 have their axial directions inclined downward from the burner body 11 side toward the inlets 12a and 13a side. The burner body 11 and burner head 20 of this embodiment correspond to the "burner body" of the present invention.

[0023] The burner head 20 in this embodiment is formed by die-casting using an aluminum alloy or brass, and is configured to be separable into two parts, upper and lower. The lower first head member 21 is placed on the burner body 11, and the upper second head member 22 is placed on the first head member 21. On the outer circumferential surface of the burner head 20 placed on the burner body 11, multiple flame ports 25, 26 are opened in two rows, upper and lower, as shown in an enlarged view in Figure 2. Of these, the upper row of multiple upper flame ports 25 defined by the first head member 21 and the second head member 22 is further composed of two types, upper and lower, with the lower first upper flame port 25a and the upper second upper flame port 25b being arranged alternately in the circumferential direction on the outer circumferential surface of the burner head 20. On the other hand, the lower row of multiple lower flame ports 26 is defined by the burner body 11 and the first head member 21.

[0024] The gas supply pipe 40 that supplies fuel gas to the gas burner 10 is equipped with a main valve 43 for opening and closing the gas supply pipe 40. Downstream of the main valve 43, the gas supply pipe 40 branches into two, and each of the two branch pipes (first branch pipe 41, second branch pipe 42) is equipped with flow control valves 44a and 44b for adjusting the flow rate of fuel gas. In this embodiment, the first branch pipe 41 and the second branch pipe 42 correspond to the "gas supply passage" of the present invention.

[0025] As shown in the figure, the end of the large mixing pipe 12 on the inlet 12a side is provided with an enlarged diameter section 12b, and the inlet 12a opens at the end of the enlarged diameter section 12b. When fuel gas is injected into the large mixing pipe 12 from the nozzle at the tip of the first branch pipe 41, which is located approximately in the center of the inlet 12a, air is drawn in from around the inlet 12a by the ejector effect and flows into the large mixing pipe 12. The mixed gas of fuel gas and air, which has passed through the large mixing pipe 12, is supplied to the burner body 11. Similarly, the end of the small mixing pipe 13 on the inlet 13a side is provided with an enlarged diameter section 13b, and the inlet 13a opens at the end of the enlarged diameter section 13b. When fuel gas is injected into the small mixing pipe 13 from the nozzle at the tip of the second branch pipe 42, which is positioned approximately in the center of the inlet 13a, air flows into the small mixing pipe 13 from around the inlet 13a, and the mixed fuel gas and air that has passed through the small mixing pipe 13 is supplied to the burner body 11.

[0026] The gas burner 10 in this embodiment is a so-called parent-child burner, where a large mixing pipe 12 supplies mixed gas to a plurality of upper flame ports 25 (first upper flame port 25a and second upper flame port 25b) on the upper side, while a small mixing pipe 13 supplies mixed gas to a plurality of lower flame ports 26 on the lower side. As shown in the figure, a spark plug 31 is installed close to the outer surface of the burner body 11, and a canopy portion 23 that extends from the outer surface of the burner head 20 covers the top of the spark plug 31. When a spark discharge is generated from this spark plug 31 toward the burner head 20, combustion of the mixed gas ejected from the lower flame ports 26 is started, and the combustion of the mixed gas ejected from the upper flame ports 25 is started by the transfer of flame from the lower flame ports 26. In addition, a flame sensor 32 consisting of a thermocouple is installed adjacent to the spark plug 31, making it possible to detect the flame from the lower flame port 26 based on the electromotive force of the thermocouple.

[0027] In such gas burners 10, a regulator for adjusting the amount of air inflow may be attached to the inlet ends 12a and 13a of the mixing tubes 12 and 13, depending on the type of fuel gas. In the gas burner 10 of this embodiment, a regulator 15 is attached to the small mixing tube 13, and this regulator 15 will be described below.

[0028] Figure 3 is a perspective view showing the regulator 15 of this embodiment, which is attached to the inlet 13a end of the small mixing pipe 13. First, Figure 3(a) shows an exploded view of the small mixing pipe 13 before the regulator 15 is attached, and the figure shows the small mixing pipe 13 as viewed from the inlet 13a side. As shown in the figure, the small mixing pipe 13 is constructed by joining two sheet metal members (lower member 13c, upper member 13d) vertically, and has a flat flange portion 13e formed by overlapping the lower member 13c and the upper member 13d, on both sides along the axial direction of the small mixing pipe 13. This flange portion 13e is joined by folding the side edge of the upper member 13d back to the lower surface side of the lower member 13c and crimping it. Note that the method of joining the lower member 13c and the upper member 13d in the flange portion 13e is not limited to crimping, but may also be welding or the like.

[0029] Furthermore, the shape of the small mixing tube 13 is such that the diameter of the cylindrical tube gradually decreases from the burner body 11 side to the inlet 13a side, and then an enlarged section 13b is provided at the end on the inlet 13a side where the diameter suddenly widens, resulting in a so-called Venturi shape. A convex portion 13f is provided at the upper end of the outer surface of this enlarged section 13b that protrudes upward. A nozzle 45 attached to the tip of the second branch pipe 42 is positioned approximately in the center of the inlet 13a.

[0030] Although not shown in the diagram, a support plate is fixed to the flange portion 13e to support the second branch pipe 42, aligned with the small mixing pipe 13. This support plate has a groove with a roughly semicircular cross-sectional shape into which the second branch pipe 42 is fitted, and an elongated hole perpendicular to the groove. By fitting the circumferential protrusions 42a provided on the outer circumference of the second branch pipe 42 into the elongated hole, the tip of the second branch pipe 42 is positioned approximately in the center of the inlet 13a.

[0031] The regulator 15 in this embodiment is formed by sheet metal processing using a thin sheet of stainless steel or the like, and as shown in the figure, it has a substantially circular flat portion 15a facing the inlet 13a of the small mixing tube 13, and a cylindrical portion 15b extending cylindrically from the outer edge of the flat portion 15a toward the small mixing tube 13. The flat portion 15a has a substantially circular main opening 16a that opens approximately in the center, and a smaller, horizontally elongated elliptical secondary opening 16b that opens below the main opening 16a. The cylindrical portion 15b has a through hole 17 that penetrates vertically through its upper end, and notches 18 are cut out along the axial direction from the small mixing tube 13 side at two locations on both the left and right sides.

[0032] Figure 3(b) shows the regulator 15 attached to the small mixing tube 13. In Figure 3(b), the small mixing tube 13 and the regulator 15 are shown cut in a vertical plane containing the axis of the small mixing tube 13, allowing the inside to be seen. As shown in the figure, when the regulator 15 is attached to the small mixing tube 13, the flat portion 15a covers the inlet 13a, and the cylindrical portion 15b fits onto the enlarged portion 13b. At this time, the through hole 17 provided on the upper end side of the cylindrical portion 15b and the protrusion 13f provided on the upper end side of the enlarged portion 13b fit together. In addition, the ends of the flange portion 13e of the small mixing tube 13 on the inlet 13a side fit into the notches 18 on both the left and right sides of the cylindrical portion 15b. As a result, the rotational position of the regulator 15 around the axis of the small mixing tube 13 is restricted so that the sub-opening 16b is located below the main opening 16a. Furthermore, the combination of the through hole 17 and the protrusion 13f, and the combination of the notch 18 and the flange portion 13e in this embodiment correspond to the "restricting portion" of the present invention.

[0033] Thus, the tip of the second branch pipe 42 is inserted through the main opening 16a of the regulator 15 attached to the small mixing pipe 13, and the second branch pipe 42 is positioned relative to the small mixing pipe 13 by the support plate described above, so that the sub-opening 16b is located below the second branch pipe 42. When fuel gas is injected from the nozzle 45 at the tip of the second branch pipe 42, air flows from around the regulator 15 into the small mixing pipe 13 mainly through the main opening 16a, which is close to the nozzle 45, so the amount of air that flows in can be adjusted by the opening area of ​​the main opening 16a. However, in this embodiment of the gas burner 10, the regulator 15 has a sub-opening 16b in addition to the main opening 16a, so air also flows in from the sub-opening 16b, and therefore the opening area of ​​the main opening 16a is smaller than in the case where there is no sub-opening 16b.

[0034] In such a gas stove 1, for example, if a cooking container placed on the trivet 4 overflows, the overflowing liquid may splash onto the burner head 20 and enter the inside of the burner body 11 through the flame ports 25 and 26. The liquid that enters through the lower flame port 26 then flows through the small mixing pipe 13 towards the inlet 13a, raising concerns that the liquid may splash onto the nozzle 45, blocking the injection hole 45a, or enter the second branch pipe 42 from the injection hole 45a, preventing proper fuel gas injection from the nozzle 45 and causing combustion problems in the gas burner 10.

[0035] In the gas burner 10 of this embodiment, even if liquid that has entered the inside of the burner body 11 from the lower flame port 26 flows through the small mixing pipe 13 to the inlet 13a side, the liquid is easily discharged from the sub-opening 16b, which is located below the main opening 16a in the approximate center of the flat portion 15a of the regulator 15. Therefore, compared to the case where there is no sub-opening 16b (liquid is discharged from the main opening 16a), it is possible to make it less likely for liquid to come into contact with the nozzle 45. As a result, it is possible to suppress the occurrence of combustion failures in the gas burner 10 caused by liquid blocking the injection hole 45a of the nozzle 45 or by liquid entering the second branch pipe 42 from the injection hole 45a.

[0036] Figure 4 is an explanatory diagram showing a front view of the flat portion 15a of the regulator 15 attached to the small mixing tube 13 of this embodiment. As shown in the figure, the sub-opening 16b opens below the second branch pipe 42 which is inserted through the main opening 16a, and the left and right width Ds of the sub-opening 16b is larger than the left and right outer diameter Dg of the second branch pipe 42.

[0037] As described above, when liquid enters the interior of the burner body 11 from the lower flame port 26, the liquid that flows through the small mixing pipe 13 to the inlet 13a side is discharged from the sub-opening 16b that opens in the flat section 15a of the regulator 15. However, liquid that hits the side of the sub-opening 16b on the flat section 15a may splash back. Therefore, by ensuring that the width of the sub-opening 16b is larger than the outer diameter of the second branch pipe 42, it is possible to suppress the liquid that hits the side of the sub-opening 16b and splashes back onto the nozzle 45 of the second branch pipe 42.

[0038] Furthermore, in the regulator 15 of this embodiment, when attached to the small mixing tube 13, the sub-opening 16b of the flat section 15a opens close to the lower end of the inlet 13a. By lowering the position of the sub-opening 16b on the flat section 15a as much as possible, the liquid that flows through the small mixing tube 13 to the inlet 13a side is more easily discharged from the sub-opening 16b, and less likely to remain inside the small mixing tube 13, thus suppressing liquid accumulation.

[0039] However, if the rotational position of the regulator 15 around the axis of the small mixing pipe 13 is not appropriate, and the sub-opening 16b is not located below the main opening 16a (second branch pipe 42), the effect of discharging the liquid that has flowed through the small mixing pipe 13 to the inlet 13a side from the sub-opening 16b will be reduced. In the gas burner 10 of this embodiment, as described above, the fitting of the through hole 17 of the cylindrical part 15b with the protrusion 13f of the enlarged diameter part 13b, and the flange part 13e of the small mixing pipe 13 into the notch 18 of the cylindrical part 15b, allows the regulator 15 to be attached to the small mixing pipe 13 at an appropriate rotational position, thus ensuring that the above effect can be reliably obtained.

[0040] The gas burner 10 of the above-described embodiment also has the following modifications. Below, the modifications will be described focusing on the differences from the above-described embodiment. In the description of the modifications, components similar to those in the above-described embodiment will be denoted by the same reference numerals and their description will be omitted.

[0041] Figure 5 is an explanatory diagram showing a front view of the planar portion 15a of the modified regulator 15. In the regulator 15 of the embodiment described above, a main opening 16a and a sub-opening 16b were separately provided in the planar portion 15a (see Figure 4). In contrast, in the modified regulator 15, as shown in the figure, the main opening 16a and the sub-opening 16b are connected to form a single opening 16 in the planar portion 15a. The cylindrical portion 15b of the modified regulator 15 is the same as in the embodiment described above.

[0042] Even in such a single integrated opening 16, it is eccentrically positioned downward from the center of the flat section 15a, and an opening area below the second branch pipe 42 is secured. As with the previously described embodiment, the liquid that flows through the small mixing pipe 13 towards the inlet 13a is easily discharged from the lower end of the opening 16 (sub-opening 16b), thus preventing liquid from coming into contact with the nozzle 45. Furthermore, by making the width of the opening 16, particularly below the second branch pipe 42, larger than the left and right outer diameters of the second branch pipe 42, even if liquid that hits the sides of the opening 16 in the flat section 15a after passing through the small mixing pipe 13 splashes back, it is possible to prevent it from coming into contact with the nozzle 45. Moreover, by bringing the lower end of the opening 16 closer to the lower end of the inlet 13a, it is possible to suppress the accumulation of liquid inside the small mixing pipe 13. Such modified regulators 15 are particularly effective in gas burners 10 where the diameter of the inlet 13a of the small mixing pipe 13 is small and limited.

[0043] Figure 6 is an explanatory diagram showing an example in which a main opening 16a and a secondary opening 16b are separately provided in the flat section 15a of the regulator 15 when the diameter of the inlet 13a of the small mixing pipe 13 is small and limited. As shown in the figure, the flat section 15a needs to have space between the outer circumference of the second branch pipe 42, which is positioned approximately in the center, and the periphery of the main opening 16a, as well as the distance between the main opening 16a and the secondary opening 16b, and the vertical height of the secondary opening 16b, in addition to the need to secure a bending allowance for bending the cylindrical section 15b from the outer edge of the flat section 15a. To satisfy this, empirically, a distance of at least 8 mm is required from the outer circumference of the second branch pipe 42 to the outer circumference of the flat section 15a. In other words, in order to separately provide the main opening 16a and the secondary opening 16b in the flat section 15a, the outer diameter Dp of the flat section 15a must be at least the outer diameter Dg of the second branch pipe 42 + 16 mm.

[0044] However, in a gas burner 10 where the diameter of the inlet 13a of the small mixing pipe 13 is small and limited, the area of ​​the flat section 15a covering the inlet 13a is also limited, and the outer diameter Dp of the flat section 15a may be smaller than the outer diameter Dg + 16 mm of the second branch pipe 42. Therefore, by providing the main opening 16a and the sub-opening 16b as a single unit, as in the modified example, it becomes easier to secure the total opening area than if they were provided separately. In addition, when assembling the gas burner 10 and the second branch pipe 42, the integrated opening 16 is larger than the sub-opening 16b and the separate main opening 16a, which has the effect of making it easier to insert the second branch pipe 42.

[0045] Although the gas burner 10 in the examples and modified forms has been described above, the present invention is not limited to the above examples and modified forms, and can be implemented in various forms without departing from the spirit of the invention.

[0046] For example, in the embodiment described above, the regulator 15 was attached to the small mixing tube 13. However, the regulator 15 is not limited to the small mixing tube 13, but may also be attached to the large mixing tube 12, and the present invention can be suitably applied to the large mixing tube 12 as well as the small mixing tube 13.

[0047] Furthermore, in the embodiment described above, the axial direction of the two substantially parallel mixing tubes 12 and 13 was inclined downward from the burner body 11 side toward the inlet 12a and 13a side. However, the axial direction of the two substantially parallel mixing tubes 12 and 13 may also be horizontal from the burner body 11 side toward the inlet 12a and 13a side. In this case as well, since the liquid that enters the interior of the burner body 11 from the flame ports 25 and 26 may flow through the mixing tubes 12 and 13 toward the inlet 12a and 13a side, the present invention can be suitably applied. In addition, the two mixing tubes 12 and 13 are not limited to being substantially parallel; the axial direction of one of them may be horizontal from the burner body 11 side toward the inlet 12a and 13a side, while the axial direction of the other is inclined downward from the burner body 11 side toward the inlet 12a and 13a side.

[0048] Furthermore, in the embodiments described above, a gas burner 10 (a so-called parent-child burner) in which two mixing pipes (a large mixing pipe 12 and a small mixing pipe 13) are connected to the burner body 11 was used as an example. However, the application of the present invention is not limited to parent-child burners, and the present invention can also be suitably applied to a type in which only one mixing pipe is connected to the burner body 11 (a so-called single burner).

[0049] Furthermore, in the embodiment described above, the tip of the second branch pipe 42, which branches off from the gas supply pipe 40, was inserted into the main opening 16a of the regulator 15, and a nozzle 45 was attached to the tip of the second branch pipe 42. However, the second branch pipe 42 may be connected to an injection unit in which the gas supply passage and nozzle are integrally formed by die casting, and the nozzle side of the injection unit may be inserted into the main opening 16a. [Explanation of Symbols]

[0050] 1...Gas stove, 2...Stove body, 3...Top plate, 4... Trivet, 4a... Frame, 4b... Claw 5...Operation knob, 10...Gas burner, 11...Burner body, 12...Large mixing pipe, 12a...Inlet, 12b...Enlarged diameter part, 13...Small mixing pipe, 13a...Inlet, 13b...Enlarged diameter part, 13c...Lower member, 13d...Upper member, 13e...Flange section 13f...convex part, 15...regulator, 15a...flat part 15b...Cylindrical part, 16...Opening, 16a...Main opening, 16b...Sub-opening, 17...Through hole, 18...Notch, 20... Burner head, 21... First head member, 22... Second head member, 23... Canopy section, 25... Upper flame port, 25a... First upper flame port, 25b...Second upper flame port, 26...Lower flame port, 31...Spark plug, 32... Flame sensor, 40... Gas supply pipe, 41... First branch pipe, 42...Second branch pipe, 42a...Protrusion, 43...Main valve, 44a...Flow control valve, 45...Nozzle, 45a...Injection hole.

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 the other end having an inlet, wherein a nozzle at the tip of the gas supply passage for supplying fuel gas is positioned approximately in the center of the inlet, and as the fuel gas is injected from the nozzle into the mixing tube, air flows into the mixing tube from around the inlet, and the mixed gas of the fuel gas and the air mixed through the mixing tube is supplied to the burner body, thereby burning the mixed gas ejected from the flame port, The mixing tube has an axial direction that is inclined horizontally or downward from the burner body side toward the inlet side, and a regulator for adjusting the amount of air flowing in is attached to the end on the inlet side. The regulator comprises a flat portion that covers the inlet and a cylindrical portion that extends cylindrically from the outer edge of the flat portion toward the mixing pipe and fits onto the mixing pipe. The aforementioned flat portion is provided with a main opening located approximately in the center of the flat portion, through which the leading end of the gas supply passage is inserted, and a secondary opening located below the main opening. A gas burner characterized by the following features.

2. In the gas burner according to claim 1, The aforementioned planar portion is provided with the main opening and the sub-opening connected and forming a single, integrated opening. A gas burner characterized by the following features.

3. In the gas burner according to claim 1 or claim 2, The width of the secondary opening is greater than the outer diameter of the gas supply passage. A gas burner characterized by the following features.

4. In the gas burner according to claim 1 or claim 2, The aforementioned secondary opening is located close to the lower end of the inlet. A gas burner characterized by the following features.

5. In the gas burner according to claim 1 or claim 2, The inlet and the planar portion are substantially circular. When attaching the regulator to the mixing tube, a restricting part is provided to restrict the rotational position of the regulator with respect to the axis of the mixing tube. A gas burner characterized by the following features.

6. A cooking appliance equipped with a gas burner according to claim 1 or claim 2, which heats an upper heating container by combustion from the gas burner.

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