Cooking apparatus

Abstract

The present invention relates to a cooking apparatus. The present invention may comprise a burner head (130) having a plurality of flame holes (152). A burner cap (190) may be stacked on the burner head (130), and a gas channel (GS2) may be formed between the burner cap (190) and the burner head (130). A protrusion (170) may be provided on either a surface of the burner head (130) or a surface of the burner cap (190), the surfaces forming the gas channel (GS2). The protrusion (170) may extend in a direction which reduces the distance between a tube outlet (133b) and the surface of the burner cap (190) facing the tube outlet (133b), wherein the protrusion (170) may be formed such that the protrusion height decreases along the circumferential direction of the gas channel (GS2).

Description

Cooking appliances

[0001] The present invention relates to a cooking appliance.

[0002] Cooking appliances are devices installed in the kitchen to cook food. These appliances can be categorized by the heat source, type, or fuel used. Cooking appliances can be categorized by the way they cook food: open and enclosed, depending on the space in which the food is placed. Enclosed appliances include ovens and microwave ovens, while open appliances include cooktops and griddles.

[0003] A closed-type cooking appliance seals the food container with a door and heats the sealed space to cook the food. An open-type cooking appliance heats the food or its container in an open space to cook the food. Recently, combination cooking appliances have emerged, combining both closed-type and open-type cooking appliances, combining multiple heat sources to cook a variety of foods and multiple portions simultaneously.

[0004] Among open-air cooking appliances, the most widely used is the gas range. Gas ranges cook food using the flame generated when gas is combusted by a burner.

[0005] The most widely used burner in gas range-type cooking appliances is the Bunsen burner, which largely comprises a burner body, a burner head, and a burner head cap. Looking at the operation of the burner, when the gas ejected from the nozzle enters the mixing tube, some of the air required for combustion (referred to as "primary air") is sucked into the mixing tube, where the gas and air are mixed. This mixed gas (a mixture of gas and air) is combusted in multiple flame holes, and new air (referred to as "secondary air") is sucked in around the flame, enabling complete combustion.

[0006] However, unstable flames may occur in some of the multiple flame holes. For example, if the outflow rate of the mixed gas flowing out of the flame hole is greater than the combustion rate, the flame may not combust in contact with the flame hole but instead combust in a space away from the flame hole, resulting in a lift flame. In severe cases, the flame may even go out.

[0007] In particular, a high-pressure mixed gas may be provided around the outlet of the mixing tube through which the mixed gas is discharged, and a large amount of primary air may be provided. This may result in frequent occurrence of rising flames in the flame holes positioned adjacent to the outlet of the mixing tube.

[0008] When a floating flame occurs, incomplete combustion can lead to an increase in harmful gases such as carbon monoxide (CO), and in severe cases, the flame can even go out completely. Furthermore, floating flames can lead to explosions and overheating, compromising burner safety and reducing thermal efficiency.

[0009] To solve this problem, if the supply pressure of the mixed gas or the supply of primary air is reduced, incomplete combustion in the flame hole becomes more severe, and another problem of not being able to smoothly combust may occur, especially in flame holes located far from the outlet of the mixing tube.

[0010] The present invention is intended to solve the problems of the prior art as described above, and the purpose of the present invention is to enable a flame to be generated uniformly in the flame holes of a burner.

[0011] Another object of the present invention is to prevent flames from rising by lowering the pressure at the outlet of the mixing tube, while ensuring that the mixed gas is supplied evenly over the entire area of ​​the burner head.

[0012] Another object of the present invention is to ensure that the mixed gas is smoothly supplied to the entire gas channel area of ​​the burner head without increasing the number of mixing tubes.

[0013] According to a feature of the present invention for achieving the above-mentioned object, the present invention may include a burner head having a plurality of flame holes. A burner cap may be laminated on the burner head, and a gas channel may be formed between the burner cap and the burner head. A protrusion may be provided on either the surface of the burner head forming the gas channel or the surface of the burner cap forming the gas channel.

[0014] At this time, the protrusion may be formed so that the protrusion height decreases along the circumferential direction of the gas channel. The velocity of the gas (mixed gas) flowing through the tube outlet portion whose height (or width) is decreased by the protrusion may increase, and at the same time, the pressure around the tube outlet may decrease.

[0015] The above protrusion may protrude in a direction that narrows the distance between the tube outlet and the surface of the burner cap facing the tube outlet. Accordingly, the pressure of the mixed gas around the tube outlet can be lowered, and the occurrence of a rising flame in the flame holes around the tube outlet can be prevented.

[0016] The above protrusion may protrude from the surface of the burner head. The protrusion itself may serve as a type of bead structure, thereby increasing the durability of the burner head.

[0017] The above protrusion can wrap around the edge of the tube outlet. In this way, the tube path inside the mixing tube can be lengthened, and mixing of the gas and primary air can be achieved more effectively.

[0018] The protrusion may gradually decrease in height along the circumferential direction of the gas channel from the edge of the tube outlet. In this way, the protrusion, which decreases in height along the path of movement of the mixed gas, may assist in the diffusion of the mixed gas.

[0019] The above protrusion may protrude from the surface of the burner cap toward the tube outlet. The protrusion protruding from the burner cap may narrow the width (or height) of the gas channel, thereby reducing the pressure.

[0020] The above protrusions can extend to both sides of the tube outlet with the tube outlet as the center. Through this, the mixed gas can be effectively diffused to both sides of the protrusions.

[0021] The width of the protrusion relative to the radial direction of the burner head may be formed to narrow along the circumferential direction of the gas channel. In this way, the pressure of the mixed gas increases toward the end of the protrusion, thereby allowing the mixed gas to diffuse.

[0022] The burner head may be provided with a plurality of mixing tubes. The plurality of mixing tubes may be spaced apart from each other in the circumferential direction of the gas channel. The protrusions may be provided at the tube outlets of each of the plurality of mixing tubes.

[0023] The above gas channel can form a continuous path between the plurality of protrusions. Accordingly, a mixed gas can flow between the protrusions.

[0024] The gas channel may be formed along the circumference of the burner head. The gas channel may be provided with a plurality of protrusions spaced apart from each other along the circumference. A diffusion path of the mixed gas may be created between the plurality of protrusions spaced apart from each other.

[0025] The protrusion may include a first protrusion body that surrounds the edge of the tube outlet, and a second protrusion body that extends from the first protrusion body along the circumferential direction of the gas channel. The second protrusion body may have a protrusion height that gradually decreases along the circumferential direction of the gas channel.

[0026] At the end of the second protruding body, a protruding end extending at a different angle from the surface of the second protruding body toward the bottom surface of the gas channel may be formed.

[0027] The gas channel may include a first gas channel connected to the tube outlet and having a first height, and a second gas channel connected from the first gas channel along the circumferential direction of the gas channel and having a second height. The second height may be formed higher than the first height.

[0028] The width of the protrusion based on the radial direction of the burner head may be narrower than the radial width of the gas channel.

[0029] The height of the above gas channel can be formed to increase in the circumferential direction from the tube outlet.

[0030] Among the plurality of flame holes, the flame holes positioned relatively close to the tube outlet may be smaller than the flame holes positioned relatively far from the tube outlet. These relatively small-sized flame holes may be adjacent to the portion of the protrusion with the greatest protrusion, and may become the flame holes where the mixed gas with reduced pressure is combusted.

[0031] The above-mentioned flame holes may be arranged along the head wall of the burner head. The surface of the protrusion may be spaced apart from the surface of the head wall.

[0032] The upper end of the above protrusion may be spaced apart from the lower end of the above salt holes in the direction of the tube outlet.

[0033] Among the plurality of flame holes, flame holes arranged in the same radial area as the tube outlet based on the radial direction of the burner head may be smaller than flame holes arranged at locations outside the same radial area as the tube outlet.

[0034] The plurality of flame holes may include a first flame hole positioned in an area between two imaginary extension lines passing through the center of the burner head and the opposite edges of the tube outlet, respectively. In addition, the plurality of flame holes may include a second flame hole positioned outside the area between the two imaginary extension lines. In this case, the second flame hole may be formed larger than the first flame hole.

[0035] The height at which the protrusion protrudes from the surface of the burner head may be less than or equal to the distance between the protrusion and the burner cap.

[0036] The area of ​​the above protrusion can be formed to be three to five times the area of ​​the tube outlet.

[0037] The height of the gas channel at a position outside the protrusion may be formed between 2 and 3.5 times the height at which the protrusion protrudes from the surface of the burner head.

[0038] The circumferential arc distance of the gas channel based on the center of the burner head may be between 2.5 and 5.5 times the circumferential arc distance of the protrusion.

[0039] The burner head may include a head wall in which the flame holes are arranged, and a channel fence concentric with the head wall and having a smaller diameter than the head wall. The gas channel may be formed between the head wall and the channel fence. The protrusion may be arranged between the head wall and the channel fence.

[0040] The burner head may be provided with inner flame holes surrounded by the flame holes. The inner flame holes may be supplied with a mixed gas from an inner gas channel separated from the gas channel.

[0041] The burner head may be provided with a pair of partition walls extending radially between an edge of the burner head and a center of the burner head. An air supply portion separated from the gas channel may be formed between the pair of partition walls. The pair of partition walls may isolate a portion of the gas channel, so that the gas channels may be formed on both sides of the air supply portion centered on the air supply portion.

[0042] A transmission hole may be formed in the above pair of partition walls to transmit a mixed gas between the disconnected gas channels.

[0043] The above pair of partition walls may each have a transmission hole formed therein. The transmission holes may have different radial distances from the center of the burner head.

[0044] The gas channel may include a first gas channel connected to the tube outlet and having a first height based on a direction in which the tube outlet is opened. The gas channel may further include a second gas channel connected from the first gas channel along a circumferential direction of the gas channel and having a second height based on a direction in which the tube outlet is opened. In this case, the second height may be formed higher than the first height.

[0045] The gas channel may further include a third gas channel extending further along the circumference of the gas channel from the second gas channel. The third gas channel may have a third height based on the direction in which the tube outlet is opened. In this case, the third height may be higher than the second height.

[0046] The above gas channel may be formed along the circumference of the burner head. Both ends of the third gas channel may be connected to two different second gas channels, respectively.

[0047] The cooking appliance according to the present invention as discussed above has the following effects.

[0048] The cooking appliance of the present invention is provided with a gas channel for delivering a mixed gas to each of the flame holes. The gas channel is provided with a protrusion, and the protrusion can reduce the height (or width) of the gas channel around the tube outlet through which the mixed gas is supplied. As the velocity of the gas (mixed gas) flowing through the tube outlet portion with the reduced height (or width) increases, the pressure around the tube outlet decreases. Accordingly, the occurrence of a rising flame in some of the flame holes near the tube outlet due to the high gas pressure can be prevented, and the flame can be uniformly generated in the flame holes of the burner.

[0049] Furthermore, in the present invention, the protrusions may gradually decrease in height along the circumferential direction away from the tube outlet. This reduces the flow velocity of the gas flowing along the surface of the protrusions, allowing the gas to diffuse smoothly to the flame holes located further from the tube outlet. Consequently, the mixed gas can be uniformly combusted throughout the flame holes, improving the performance of the cooking appliance.

[0050] Additionally, in the present invention, a plurality of protrusions can be spaced apart and arranged along a gas channel. A continuous gas channel is provided between the plurality of spaced protrusions, and the mixed gas, smoothly diffused as it passes through the protrusions, can be stably delivered through this continuous gas channel. Therefore, the entire flame hole can evenly generate flames, provide high thermal power, and shorten the boiling time.

[0051] Furthermore, in the present invention, a continuous gas channel can be formed between the plurality of protrusions, allowing the mixed gas to diffuse over a large area. Accordingly, even with a small number of mixing tubes and tube outlets in the burner device, the mixed gas can be evenly distributed throughout the entire burner area. Therefore, based on the same thermal power, the manufacturing cost of the burner device is also reduced.

[0052] In particular, the plurality of protrusions in the present invention may be formed to protrude from the surface of the burner head defining the gas channel or the surface of the burner cap facing it. Therefore, the present invention can be applied to conventional burner devices without significant modification, and in particular, it is easy to perform additional processing on existing burner devices. Consequently, the manufacturability of the burner device is also improved.

[0053] Furthermore, in the present invention, the flame holes adjacent to the tube outlet may be relatively smaller in size than the flame holes positioned further away from the tube outlet. These relatively small flame holes may be adjacent to the most protruding portion of the protrusion, thereby becoming the flame holes where the low-pressure mixed gas is combusted. Therefore, even if a high-pressure mixed gas is supplied from the tube outlet, the occurrence of a rising flame in the flame holes adjacent to the tube outlet can be prevented.

[0054] Additionally, the protruding structure of the protrusion in the present invention can transform the mixing tube and the gas channel connected thereto into a type of venturi tube. This allows external primary air to flow more smoothly into the mixing tube, effectively mixing gas and oxygen. This has the effect of improving the thermal efficiency of the burner device.

[0055] In particular, the protrusion can increase the overall length of the tube path formed inside the mixing tube. Accordingly, the mixing of gas passing through the mixing tube and primary air can be more effectively achieved, and the venturi effect of primary air intake can also be enhanced, resulting in smoother combustion in the flame chamber.

[0056] Furthermore, in the present invention, the protrusion itself serves as a kind of bead structure, thereby enhancing the durability of the burner head. Burner heads, which undergo repeated cycles of high heat and subsequent cooling, can experience decreased durability over time. The protrusion can enhance the durability of such burner heads.

[0057] Additionally, the burner head of the present invention may be equipped with an air supply unit for supplying secondary air. While a portion of the gas channel is disconnected by the air supply unit, a transfer flame hole is formed in the disconnected portion, allowing a flame to propagate between the two disconnected gas channels. Furthermore, the transfer flame hole may propagate the flame from inner flame holes provided on the inside to outer flame holes formed concentrically therewith. Therefore, the present invention can be applied to a dual burner having dual flame holes, and the mixed gas and flame can be smoothly diffused.

[0058] Figure 1 is a perspective view showing an example of a cooking appliance according to the present invention.

[0059] Figure 2 is a perspective view showing the structure of an upper plate and a burner constituting one embodiment of the present invention.

[0060] Figure 3 is an enlarged perspective view showing the structure of the upper plate and burner constituting one embodiment of the present invention.

[0061] Figure 4 is a conceptual diagram comparing a flame generated from a burner constituting an embodiment of the present invention with a flame generated from a conventional burner.

[0062] Fig. 5 is a perspective view showing the structure of a burner constituting one embodiment of the present invention.

[0063] Fig. 6 is a perspective view showing a burner according to an embodiment of the present invention with the inner burner cap and outer burner cap omitted.

[0064] Figure 7 is a perspective view showing the components constituting a burner according to an embodiment of the present invention in an exploded manner.

[0065] Fig. 8 is a perspective view showing the components constituting a burner according to an embodiment of the present invention, taken from a different angle than Fig. 7.

[0066] Fig. 9 is a cross-sectional view taken along line XI-XI' of Fig. 2.

[0067] Fig. 10 is a cross-sectional view taken along line X-X' of Fig. 2.

[0068] Fig. 11 is a cross-sectional view showing the internal structure of a burner, omitting the outer burner cap constituting the burner constituting one embodiment of the present invention.

[0069] Fig. 12 is an enlarged perspective view of a burner and an upper plate, with the inner burner cap and outer burner cap omitted, constituting an embodiment of the present invention.

[0070] Fig. 13 is a plan view showing a burner and an upper plate with the inner burner cap and outer burner cap omitted from a burner constituting an embodiment of the present invention.

[0071] Fig. 14 is a plan view showing a burner according to an embodiment of the present invention, with the inner burner cap and outer burner cap omitted.

[0072] Fig. 15 is a cross-sectional view showing the structure of a burner head and an outer burner cap constituting one embodiment of the present invention.

[0073] Fig. 16 is a cross-sectional view showing the structure of a burner head constituting one embodiment of the present invention.

[0074] Fig. 17 is an enlarged cross-sectional view of part A of Fig. 15.

[0075] Fig. 18 is a side view schematically illustrating the flow path of a mixed gas formed inside a burner constituting one embodiment of the present invention.

[0076] Figure 19 is a graph showing the velocity and pressure at each location of the flow path constituting one embodiment of the present invention.

[0077] Fig. 20 is a graph showing the combustion uniformity in a flame hole according to the change in the width of the protrusion for the tube outlet constituting one embodiment of the present invention.

[0078] Fig. 21 is a cross-sectional view showing a second embodiment of a burner head constituting a burner of a cooking appliance according to the present invention.

[0079] Fig. 22 is a cross-sectional view showing a third embodiment of a burner head constituting a burner of a cooking appliance according to the present invention.

[0080] Fig. 23 is a plan view showing a fourth embodiment of a burner head constituting a burner of a cooking appliance according to the present invention.

[0081] Fig. 24 is an enlarged plan view of a fifth embodiment of a burner head constituting a burner of a cooking appliance according to the present invention.

[0082] Fig. 25 is an enlarged plan view of a sixth embodiment of a burner head constituting a burner of a cooking appliance according to the present invention.

[0083] Fig. 26 is an enlarged plan view of a seventh embodiment of a burner head constituting a burner of a cooking appliance according to the present invention.

[0084] Fig. 27 is an enlarged plan view of an eighth embodiment of a burner head constituting a burner of a cooking appliance according to the present invention.

[0085] Fig. 28 is an enlarged cross-sectional view of a burner head and an outer burner cap constituting a ninth embodiment of a burner of a cooking appliance according to the present invention.

[0086] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components will be given the same reference numerals, even if they appear in different drawings. Furthermore, when describing embodiments of the present invention, if a detailed description of a related known structure or function is deemed to hinder understanding of the embodiments of the present invention, such detailed description will be omitted.

[0087] The present invention relates to a cooking appliance, which includes a gas burner device (100A-100D). Referring to Fig. 1, a gas burner device (100A-100D, hereinafter referred to as "burner device (100A-100D)") is disposed on the upper portion of the cooking appliance. As shown in Fig. 1, the burner device (100A-100D) may be disposed so as to be exposed on the upper portion of the cooking appliance. As another example, the burner device (100A-100D) may be disposed inside the cooking appliance, or may be disposed inside and outside the cooking appliance, respectively. Hereinafter, an example in which the burner device (100A-100D) is disposed on the upper portion of the cooking appliance will be described.

[0088] For reference, the term "radial direction" hereinafter refers to a direction toward or away from the center of the burner head (130) along the radius of the burner head (130) constituting the burner device (100A). And, the term "circumferential direction" hereinafter refers to a direction proceeding along a circle or circumference, which is the shape of the burner head (130) or the gas channel (GS1, GS2).

[0089] The above burner devices (100A-100D) are configured to combust a mixed gas, which is a mixture of gas and air, and cook food with the flames generated by the combustion. The burner devices (100A-100D) are formed with a plurality of flame holes (142, 152), so as to generate a plurality of flames (F1, F2). In the present invention, a uniform flame can be generated in the plurality of flame holes (142, 152). Below, the burner devices (100A-100D) will be described with a focus on this structure. For reference, the mixed gas below refers to a mixture of gas and air.

[0090] As shown in Fig. 1, in the present embodiment, an oven section (40, 50) is arranged at the bottom of the cooking appliance, and a cooktop section (20) including a plurality of burner devices (100A-100D) is provided at the top. The cooking appliance may be configured as a built-in or non-built-in type cooking appliance having at least one cooking chamber therein. As another example, the cooking appliance may omit the oven section (40, 50) and be configured only with the cooktop section (20). The oven section (40, 50) may be referred to as a grill section, and the cooktop section (20) may be referred to as a top section, respectively.

[0091] Looking at the structure of the above cooking appliance, the exterior of the cooking appliance is formed by an outer body (10). The outer body (10) may form the skeleton of the cooking appliance, excluding the door positioned at the front. A separate inner housing (not shown) may be positioned inside the outer body (10).

[0092] The above cooktop unit (20) includes an upper plate (21) that forms the upper surface appearance of the cooktop unit (20). At least one burner device (100A-100D) for heating food to be cooked or a container containing food is arranged on the upper plate (21). In the present embodiment, a total of four burner devices (100A-100D) are arranged on the upper plate (21). This structure will be described again below.

[0093] The above cooktop unit (20) may be equipped with a grate (25). The grate (25) is a frame on which a cooking vessel can be placed on the upper side of the burner device (100A). The grate (25) is detachably mounted on the upper plate (21). The grate (25) may be positioned on the upper side of the burner device (100A). Reference numeral 27 of the drawing represents an exhaust plate, and the exhaust plate (27) can allow air to flow into and out of the cooking appliance.

[0094] A front panel (30) may be arranged above the oven section (40, 50) and in front of the cooktop section (20). The front panel (30) may include knobs (31) for operating the oven section (40, 50) and the cooktop section (20). Each of the plurality of knobs (31) may operate separate burner devices (100A) and the oven device. Instead of a rotary knob, an input device such as a switch, mechanical or electronic button, etc. may be provided. The front panel (30) may also be viewed as an operating device.

[0095] The front panel (30) may be equipped with a display panel (35). The display panel (35) may display information about the cooking appliance. The display panel (35) may be configured as a touch panel and may be used by a user to operate the cooking appliance. In other words, the display panel (35) may be a type of control unit. As another example, the display panel (35) may be omitted.

[0096] Looking at the above oven section (40, 50), the oven section (40, 50) may include a plurality of oven devices. In the present embodiment, the oven section (40, 50) includes a first oven device (40) and a second oven device (50). The first oven device (40) and the second oven device (50) are arranged at different heights. The first oven device (40) and the second oven device (50) may each be formed with separate cooking chambers that are partitioned from each other.

[0097] The first door (45) of the first oven device (40) may be operated in a pull-down manner in which the upper portion rotates up and down around the lower portion. As another example, the first door (45) may be operated in a side-swing manner in which it opens sideways. Drawing reference numeral 47 indicates a handle for opening and closing the first door (45).

[0098] The second door (55) of the second oven device (50) may be operated in a manner that slides forward and backward. As another example, similar to the first door (45) above, the second door (55) may also be operated in a type of pull-down manner in which the upper portion rotates up and down around the lower portion. Drawing reference numeral 57 indicates a handle for opening and closing the second door (55).

[0099] Next, let's look at the above burner devices (100A-100D). As previously explained, this embodiment includes a total of four burner devices (100A-100D). In order to distinguish the four burner devices (100A-100D) in the drawing, different drawing reference numerals (100A-100D) are assigned to the four burner devices (100A-100D). Hereinafter, the burner device (100A) located on the right front will be described as an example.

[0100] Referring to Fig. 2, the oven section (40, 50) and a portion of the grate (25) are illustrated with the omission. As can be seen, when the grate (25) is removed, the burner caps (180, 190) constituting the burner device (100A) can be exposed. In the present embodiment, the burner device (100A) includes an inner burner cap (180) and an outer burner cap (190) that cover flame holes (142, 152) constituting concentric circles, respectively. This structure will be described again below.

[0101] In FIGS. 2 and 3, the reference numeral K1 represents an imaginary extension line that crosses the center of the cooktop unit (20) in the front-back direction. Here, the center of the cooktop unit (20) means the exact center of the cooktop unit (20) based on the plan view. Therefore, the reference numeral K1 can be regarded as the front-back center line of the cooktop unit (20). Hereinafter, K1 will be referred to as the center line (K1). The arrow K represents the direction in which the air supply unit (165) constituting the burner device (100A) faces the center line (K1). For reference, in the following descriptions and drawings, the arrow K represents the direction in which the air supply unit (165) faces the center line (K1).

[0102] Referring to Fig. 3, the inner burner cap (180) and the outer burner cap (190) are shown separated from the burner device (100A). When the inner burner cap (180) and the outer burner cap (190) are separated from the burner device (100A), the burner body (110) to be described below is exposed. An air supply portion (165) for introducing secondary air may be formed in the burner head (130). The air supply portion (165) may be opened toward the center line (K1).

[0103] The air supply section (165) above is a section where flame holes are omitted, and thus no flame is generated in the air supply section (165). When the air supply section (165) is directed toward the center line (K1), i.e., the center of the cooktop section (20), (i) the air supply section (165) is opened toward the center of the burner device (100A), which is a relatively wide space, so that a smooth supply of secondary air can be enabled, and (ii) since the flame directed toward the center of the cooking appliance, which is easily touched by the user's body or clothes, is omitted, the safety of use can be increased.

[0104] FIG. 4 illustrates flames (F1, F2) generated by the present embodiment. For reference, FIG. 4(A) shows flames (F1, F2) generated in a burner device (100A) in which the protrusion (170, see FIG. 6) of the present embodiment is omitted, and FIG. 4(B) shows flames (F1, F2) generated in a burner device (100A) equipped with the protrusion (170) of the present embodiment.

[0105] Comparing the two drawings, some of the flames generated in the burner device (100A) with the protrusion (170) omitted do not burn in contact with the flame holes, but instead burn in a space away from the flame holes, becoming lift flames (F2'). In particular, these lift flames (F2') may be generated in the flame holes (152A, see FIG. 12) adjacent to the tube outlet (133b) described below. This may occur because the pressure of the mixed gas discharged from the tube outlet (133b) is high. In contrast, as shown in FIG. 4(B), the burner device (100A) with the protrusion (170) of the present embodiment does not generate lift flames (F2'). This structure will be described in more detail below.

[0106] FIG. 5 illustrates a burner device (100A) according to the present embodiment. The burner device (100A) includes a burner body (110), a burner head (130), and burner caps (180, 190). The burner caps (180, 190) include the inner burner cap (180) and the outer burner cap (190). The burner body (110), the burner head (130), and the burner caps (180, 190) may be stacked to form the burner device (100A). External gas may be supplied to the burner device (100A) through a separate pipe (not shown). The gas supplied in this manner may be mixed with primary air to form a mixed gas during the process of passing through the burner device (100A).

[0107] A portion of the burner device (100A) may be exposed upward through a plate hole (22, see FIG. 7) of the upper plate (21). The remaining portion of the burner device (100A) may be positioned below the upper plate (21) and may not be exposed. Referring to FIG. 5, portions of the inner burner cap (180), outer burner cap (190), and side surfaces of the burner head (130) may be exposed to the outside through the plate hole (22).

[0108] The above burner device (100A) includes a burner body (110) disposed at the bottom and a burner head (130) stacked on the top of the burner body (110). The burner body (110) is disposed at the bottom of the upper plate, i.e., inside the cooktop unit (20). Accordingly, the burner body (110) may not be exposed to the outside. The burner body (110) may receive an external gas and form an inlet passage for the introduction of primary air.

[0109] Referring to FIGS. 5 and 6, the burner body (110) includes a first nozzle holder part (111) and a second nozzle holder part (113). In the present embodiment, since the burner device (100A) includes flame holes (142, 152) having different diameters, it is necessary to supply gas to the flame holes (142, 152) through different paths. To this end, the burner body (110) is provided with a first nozzle holder part (111) and a second nozzle holder part (113). As another example, if the burner device (100A) has only outer flame holes (152) without inner flame holes (142), either the first nozzle holder part (111) or the second nozzle holder part (113) may be omitted.

[0110] A disc-shaped body plate (120) constituting the burner body (110) is provided on the upper portion of the first nozzle holder portion (111). The body plate (120) may be formed integrally with the first nozzle holder portion (111), or may be formed separately and then assembled. The body plate (120) may be fixed to the upper plate (21) through a fastener or the like.

[0111] As described below, the body plate (120) can form an air inlet passage through which primary air is introduced together with the burner head (130). An ignition device (not shown) can be arranged through the body plate (120). The body plate (120) is provided with a tube through-hole (122, 123) through which a mixing tube (131, 133) provided in the burner head (130) passes. The specific structure of the burner body (110) will be described again below.

[0112] The burner head (130) is stacked on the upper portion of the body plate (120). The upper plate (21) may be placed between the upper portion of the body plate (120) and the burner head (130). For reference, in FIG. 6, reference numeral G1 indicates a space spaced between the upper portion of the body plate (120) and the burner head (130).

[0113] In this embodiment, the burner head (130) includes an inner head portion (140) and an outer head portion (150) having different diameters. An inner gas channel (GS1) and an outer gas channel (GS2) through which a mixed gas flows are formed in the inner head portion (140) and the outer head portion (150), respectively. The inner gas channel (GS1) and the outer gas channel (GS2) may have their upper portions shielded by the inner burner cap (180) and the outer burner cap (190), respectively, to form a predetermined space.

[0114] A plurality of flame holes (142, 152) are formed in the burner head (130). Inner flame holes (142) and outer flame holes (152) are formed in the inner head part (140) and the outer head part (150), respectively. The inner flame holes (142) are arranged around the outer side of the inner gas channel (GS1). The outer flame holes (152) are arranged around the outer side of the outer gas channel (GS2). A plurality of flames (F1, F2) are formed in a circular shape in the inner flame holes (142) and the outer flame holes (152), respectively. That is, the flames (F1, F2) generated in the inner flame holes (142) and the outer flame holes (152), respectively, can form two concentric circles. This appearance is illustrated in Fig. 4(B).

[0115] Referring to Fig. 6, the burner head (130) is provided with a protrusion (170). The protrusion (170) may be provided in an outer gas channel (GS2) provided on the inside of the outer head portion (150) of the burner head (130). The protrusion (170) can control the pressure and speed of the gas flowing through the outer gas channel (GS2), thereby evenly providing a mixed gas throughout the entire outer gas channel (GS2) and generating an even flame. The detailed structure of the burner head (130), including the protrusion (170), will be described again below.

[0116] The two burner caps (180, 190) may be stacked on the upper portions of the inner head portion (140) and the outer head portion (150), respectively. Among the burner caps (180, 190), the inner burner cap (180) is stacked on the upper portion of the inner head portion (140) to shield the upper portion of the inner gas channel (GS1). Through this, the mixed gas may be guided toward the inner flame holes (142). Among the burner caps, the outer burner cap (190) is stacked on the upper portion of the outer head portion (150) to shield the upper portion of the outer gas channel (GS2). Through this, the mixed gas may be guided toward the outer flame holes (152).

[0117] Let's take a closer look at the burner device (100A) with reference to FIGS. 7 and 8. For reference, FIGS. 7 and 8 also illustrate a portion of the upper plate (21) to help understand the relative positions of the burner device (100A) and the upper plate (21). As seen therein, the burner body (110) is arranged at the lowest portion of the burner device (100A). The burner body (110) may be covered by the upper plate (21) and not be exposed upward. Burner caps (180, 190) are arranged at the highest portion of the burner device (100A), and a burner head (130) is arranged between the burner caps (180, 190) and the burner body (110).

[0118] For convenience of explanation, let's first look at the burner caps (180, 190). The burner caps (180, 190) cover the open upper portion of the burner head (130) to prevent foreign substances, such as liquid overflowing from a cooking vessel, from flowing into the space inside the burner head (130). In addition, the burner caps (180, 190) may define a portion of the inner gas channel (GS1) and the outer gas channel (GS2).

[0119] Among the above burner caps (180, 190), the inner burner cap (180) is placed on the upper portion of the inner head portion (140). The inner burner cap (180) can cover the upper portion of the inner head wall (141) to be described later. The inner burner cap (180) can shield the upper portion of the inner gas channel (GS1) and guide the mixed gas to the inner flame holes (142).

[0120] The outer burner cap (190) surrounds the inner burner cap (180) and is positioned on the upper portion of the outer head portion (150). The outer burner cap (190) can cover the upper portion of the outer head wall (151) to be described later. The outer burner cap (190) can shield the upper portion of the outer gas channel (GS2) and guide the mixed gas to the outer flame holes (152). Drawing reference numeral 192 indicates a cap penetration portion for exposing the inner burner cap (180).

[0121] Looking at the burner body (110), the burner body (110) includes a first nozzle holder part (111), a second nozzle holder part (113), and a body plate (120). First, looking at the first nozzle holder part (111), the first nozzle holder part (111) is connected to a first nozzle (not shown) for supplying gas. The first nozzle holder part (111) transfers the gas supplied from the first nozzle to the inner gas channel (GS1) of the inner head part (140). The first nozzle holder part (111) may have a shape that is elongated in one direction.

[0122] Referring to Fig. 9, a first gas supply path (112) is formed in the first nozzle holder part (111). A first supply path inlet (112a) and a first supply path outlet (112b) are formed at both ends of the first gas supply path (112), respectively. The first supply path inlet (112a) is open in the left-right direction (based on Fig. 9) so that the first nozzle can be coupled thereto. Unlike the first supply path inlet (112a), the first supply path outlet (112b) is open in the vertical direction (based on Fig. 9) so that it can face the inner mixing tube (131) to be described below.

[0123] In Fig. 9, the primary air inflow path is represented by A1, the secondary air inflow path is represented by A2, and the gas supply path is represented by G. Referring to this, when looking at the process of supplying the mixed gas to the inner mixing tube (131), the gas supplied to the first supply path inlet (112a) moves along the first gas supply path (112) and is then delivered to the inner mixing tube (131) through the first supply path outlet (112b). At this time, the inner mixing tube (131) and the first supply path outlet (112b) are spaced apart from each other, and an inner chamber (GC1) is formed in the portion where the inner mixing tube (131) and the first supply path outlet (112b) are spaced apart from each other so as to face each other. An inner air path (AC), described below, is connected to the side of the inner chamber (GC1), through which primary air can be introduced. Accordingly, the gas is mixed with the primary air in the inner chamber (GC1) and then supplied to the inner mixing tube (131).

[0124] Referring again to FIGS. 7 and 8, the second nozzle holder part (113) is connected to a second nozzle (not shown) for supplying gas. The second nozzle holder part (113) transfers the gas supplied from the second nozzle to the outer gas channel (GS2) of the outer head part (150). The second nozzle holder part (113) may have a shape that is elongated in one direction. At this time, the second nozzle holder part (113) may have a shape that extends in a direction orthogonal to the first nozzle holder part (111) from the lower portion of the first nozzle holder part (111).

[0125] Referring to Fig. 10, a second gas supply path (114) is formed in the second nozzle holder part (113). A second supply path inlet (114a) and a second supply path outlet (114b) are formed at both ends of the second gas supply path (114), respectively. The second supply path inlet (114a) is opened in the left-right direction (based on Fig. 10) so that the second nozzle can be coupled thereto. Unlike the second supply path inlet (114a), the second supply path outlet (114b) is opened in the vertical direction (based on Fig. 10) so that it can face the outer mixing tube (133) to be described below. In the present embodiment, since the outer mixing tube (133) is configured in two, the number of the second supply path outlets (114b) is also correspondingly two.

[0126] In Fig. 10, the primary air inflow path is represented as A1, the secondary air inflow path as A2, and the gas supply path as G. Referring to this, when looking at the process of supplying the mixed gas to the outer mixing tube (133), the gas supplied to the second supply path inlet (114a) moves along the second gas supply path (114) and is then delivered to the outer mixing tube (133) through the second supply path outlet (114b). At this time, the outer mixing tube (133) and the second supply path outlet (114b) are spaced apart from each other, and the portion where the outer mixing tube (133) and the second supply path outlet (114b) are spaced apart from each other to face each other is open to the internal installation space of the cooktop unit (20). Accordingly, the primary air is mixed with the gas through the internal installation space of the cooktop unit (20) and then supplied to the outer mixing tube (133).

[0127] Referring again to FIG. 7, the body plate (120) may have a roughly circular shape. The body plate (120) is placed above the first nozzle holder portion (111). In the present embodiment, the second nozzle holder portion (113) is placed below the first nozzle holder portion (111), and the body plate (120) is placed above it. The body plate (120) may assist in mounting the burner head (130) and form a path for supplying primary air between the burner head (130).

[0128] An inner through hole (122) may be formed at the center of the body plate (120). The inner through hole (122) is for connection with the inner mixing tube (131). The first supply path outlet (112b) may be opened at the bottom of the inner through hole (122). (See FIG. 9) Since the inner mixing tube (131) is arranged at the upper portion of the inner through hole (122), the inner mixing tube (131) and the first supply path outlet (112b) are connected through the inner through hole (122). It can be seen that the inner chamber (GC1) is provided inside the inner through hole (122).

[0129] An outer through hole (123) may be formed on the outside of the inner through hole (122) in the body plate (120). The outer through hole (123) is for connection with the outer mixing tube (133). The outer through holes (123) are configured as a pair, and a portion of a pair of outer mixing tubes (133) may be fitted into each of the pair of outer through holes (123). After passing through the outer through hole (123), the outer mixing tube (133) faces the second supply path outlet (114b). The outer through hole (123) may also serve to guide assembly between the body plate (120) and the burner head (130).

[0130] A discharge hole (125) may be formed in the above body plate (120). The discharge hole (125) is a portion where an end of a spark plug (not shown), which is an ignition device that generates a spark for the operation of the burner device (100A), is located. The discharge hole (125) may be arranged on the outside of the inner through hole (122).

[0131] A plate fence (126) may be provided on the upper surface of the body plate (120). The plate fence (126) protrudes in a circular shape from the upper surface of the body plate (120). The plate fence (126) is formed around the edge of the inner through hole (122). The plate fence (126) contacts the lower fence (132) of the burner head (130) and supports the burner head (130).

[0132] The plate fence (126) may be provided with a first inner air passage portion (127). The first inner air passage portion (127) extends from the inner through hole (122) in the radial direction of the body plate (120). The first inner air passage portion (127) protrudes from the plate fence (126) and defines a predetermined path therebetween. The first inner air passage portion (127) comes into contact with the second inner air passage portion (137) of the burner head (130), which will be described later, to form the inner air passage portion (AC) for primary air supply. This appearance is illustrated in FIG. 9. In the present embodiment, the first inner air passage portions (127) are provided symmetrically on both sides with respect to the plate fence (126).

[0133] As another example, either the first nozzle holder part (111) or the second nozzle holder part (113) may be omitted. More precisely, if either the inner head part (140) or the outer head part (150) is omitted, either the first nozzle holder part (111) or the second nozzle holder part (113) may be omitted. As another example, the first nozzle holder part (111), the second nozzle holder part (113), and the body plate (120) may all be configured as separate parts, or at least one of them may be a separate part.

[0134] Next, the burner head (130) will be examined. The burner head (130) may be supported on the body plate (120). The burner head (130) protrudes above the upper plate (21) while being supported on the body plate (120). The burner head (130) forms a gas channel together with the burner caps (180, 190) and has flame holes (142, 152) to generate a flame by combusting gas.

[0135] The burner head (130) may have a roughly circular shape. In the present embodiment, an inner head portion (140) may be arranged inside the burner head (130) having a circular shape, and an outer head portion (150) may be arranged outside the burner head (130). A portion of the inner head portion (140) and the outer head portion (150) each protrudes upward. The inner burner cap (180) and the outer burner cap (190) may be mounted on the protruding portions to shield the upper portions of the inner gas channel (GS1) and the outer gas channel (GS2).

[0136] The inner head part (140) and the outer head part (150) respectively generate flames (F1, F2) of different diameters. That is, the burner device (100A) of the present embodiment becomes a type of dual burner. Here, the inner head part (140) can minimize the output of the burner device (100A) to enable simmering, and the outer head part (150) can play a role in shortening the boiling time by implementing high output. Of course, the functions of the inner head part (140) and the outer head part (150) are not clearly distinguished from each other. As another example, the burner head (130) may be provided with only the outer head part (150) and the inner head part (140) omitted.

[0137] First, looking at the inner head part (140), an inner mixing tube (131) is provided at the center of the inner head part (140). The inner mixing tube (131) extends vertically, and an inner tube flow path (T1, see FIGS. 9 and 11) is formed inside it. The upper end of the inner mixing tube (131) protrudes upward, and an inner head wall (141) is provided on the outside of the upper end of the inner mixing tube (131). The inner head wall (141) can surround the upper end of the inner mixing tube (131). Accordingly, an inner gas channel (GS1), which is a type of flow path, is formed between the upper end of the inner mixing tube (131) and the inner head wall (141). The inner gas channel (GS1) may be shielded at the top by the bottom surface (183) of the inner burner cap (180). As another example, the inner mixing tube (131) may be configured as a separate object from the burner head (130), or may be provided in the burner body (110).

[0138] Referring to FIGS. 7 and 8, the outlet (131b, FIG. 7) of the inner tube flow path (T1) and the inlet (131a, FIG. 8) of the inner tube flow path (T1) are illustrated. The inner burner cap (180) is arranged above the outlet (131b) of the inner tube flow path (T1), so that the mixed gas discharged through the outlet (131b) of the inner tube flow path (T1) can be guided to the inner gas channel (GS1). The inlet (131a) of the inner tube flow path (T1) can be connected to the inner chamber (GC1) as described above.

[0139] The inner head portion (140) may be provided with an inner head wall (141) that surrounds the inner mixing tube (131). Inner flame holes (142) are arranged on the upper portion of the inner head wall (141). The inner flame holes (142) are arranged to surround the outlet (131b) of the inner tube flow path (T1). Fig. 9 illustrates inner flames (F1) generated when mixed gas is combusted in the inner flame holes (142).

[0140] Referring to Fig. 8, a lower fence (132) may be provided on the bottom surface of the burner head (130). The lower fence (132) is arranged to surround the inlet (131a) of the inner tube path (T1). The lower fence (132) may protrude downward and come into contact with the plate fence (126) of the burner body (110). The lower fence (132) is formed in a circular shape corresponding to the plate fence (126).

[0141] The outer mixing tube (133) may be arranged on the outside of the inner mixing tube (131). The outer mixing tube (133) has a kind of circular tube shape that protrudes downward. The outer mixing tube (133) has an outer tube flow path (T2, see FIG. 10) formed therein. The inner mixing tube (131) is arranged such that the inlet (133a) of the outer tube flow path (T2) is spaced apart from the second supply path outlet (114b). As another example, the outer mixing tube (133) may be configured as a separate object from the burner head (130), or may be provided on the burner body (110).

[0142] The outlet (133b) of the outer tube flow path (T2) is opened toward the outer gas channel (GS2) to be described below. The mixed gas discharged through the outlet (133b) of the outer tube flow path (T2) can move along the outer gas channel (GS2). At this time, in the present embodiment, the outlet (133b) of the outer tube flow path (T2) is provided with a protrusion (170). The protrusion (170) reduces the height between the outlet (133b) of the outer tube flow path (T2) and the outer burner cap (190). Accordingly, the pressure of the mixed gas around the outlet (133b) of the outer tube flow path (T2) can be lowered. The outlet (133b) of the outer tube flow path (T2) will be referred to as a tube outlet (133b) hereinafter. This structure will be described again below. For reference, the “height” below is based on the direction in which the outlet (133b) of the outer tube euro (T2) is opened.

[0143] Referring to Fig. 8, a second inner air passage part (137) is provided along the radial direction of the burner head (130) centered on the lower fence (132). The second inner air passage part (137) protrudes from the bottom surface of the burner head (130), and a predetermined path is formed between the second inner air passage parts (137). The second inner air passage part (137) can form the inner air passage (AC) together with the first inner air passage part (127). Drawing reference numerals 134 and 138 represent a mounting guide for guiding the mounting direction of the burner head (130).

[0144] The inner head portion (140) and the outer head portion (150) may be connected to each other through a bridge portion (144). The bridge portion (144) connects the inner head wall (141) and the channel fence (160). The bridge portion (144) may extend radially from the surface of the inner head wall (141). A head penetration portion (164), which is an empty space, may be formed between a plurality of the bridge portions (144). The head penetration portion (164) may reduce the overall weight of the burner head (130) and facilitate the flow of air.

[0145] Looking at the outer head part (150), the outer head part (150) may be provided with an outer head wall (151). The outer head wall (151) may be provided in a roughly circular shape along the edge of the burner head (130). The outer head wall (151) may be provided with outer flame holes (152). The outer flame holes (152) are arranged to surround the tube outlet (133b). More precisely, the outer flame holes (152) may surround the outside of the outer gas channel (GS2) to define a portion of the outer gas channel (GS2). FIG. 10 illustrates outer flames (F2) generated when a mixed gas is combusted in the outer flame holes (152).

[0146] A channel fence (160) defining an inner boundary of the outer gas channel (GS2) may be provided on the inside of the outer gas channel (GS2). The channel fence (160) may be spaced apart from the outer head wall (151) to form the outer gas channel (GS2) between the outer head wall (151) and the outer head wall (151). The channel fence (160) may be formed in an approximately circular shape having a smaller diameter than the outer head wall (151).

[0147] As shown in Fig. 7, the burner head (130) may be provided with an air supply unit (165). The air supply unit (165) is for supplying secondary air to the burner head (130). The air supply unit (165) is formed along the radial direction of the burner head (130) from the inner head wall (141). One end of the air supply unit (165) is connected to the inner head wall (141), and the other end is opened toward the outside of the burner head (130). Accordingly, external air (secondary air) from the outside of the burner head (130), more precisely, from the upper portion of the cooktop unit (20), can be supplied to the inner gas channel (GS1) along the air supply unit (165).

[0148] In this embodiment, as described above, the air supply unit (165) faces the center of the cooktop unit (20). Referring to FIGS. 9 and 11, the direction in which the air supply unit (165) faces the center line (K1) is represented by K. In order for the air supply unit (165) to be positioned toward the center of the cooktop unit (20), the mounting guide (134, 138) can accurately set the mounting direction when the burner head (130) is mounted on the burner body (110).

[0149] Looking into more detail, the burner head (130) may be provided with a pair of partition walls (166). The partition walls (166) extend radially between the edge of the burner head (130) and the center of the burner head (130). The air supply unit (165) partitioned from the outer gas channel (GS2) is formed between the pair of partition walls (166). The other end of the pair of partition walls (166) is opened toward the center of the cooktop unit (20).

[0150] Referring to FIGS. 11 and 12, the pair of partition walls (166) cut off a portion of the outer gas channel (GS2). Accordingly, the outer gas channels (GS2) can be formed on both sides of the air supply unit (165) with the air supply unit (165) as the center. In the present embodiment, the outer gas channel (GS2) forms a continuous path, excluding the area cut off by the air supply unit (165).

[0151] The pair of partition walls (166) may be formed with transfer holes (166a, 166b). The transfer holes (166a, 166b) are formed along the circumferential direction of the burner head (130). The transfer holes (166a, 166b) can transfer a mixed gas between the disconnected outer gas channels (GS2). In the present embodiment, the transfer holes (166a, 166b) are formed in each of the pair of partition walls (166). Through this, the mixed gas flowing through the outer gas channels (GS2) can pass between the pair of partition walls (166).

[0152] Referring to Fig. 13, the pair of transmission flame holes (166a, 166b) is composed of a first transmission flame hole (166a) and a second transmission flame hole (166b). The first transmission flame hole (166a) and the second transmission flame hole (166b) can transmit the inner flame (F1) of the inner flame holes (142) to the outer flame holes (152). The air supply unit (165) is arranged between the first transmission flame hole (166a) and the second transmission flame hole (166b). In Fig. 13, the direction of arrow ① indicates the direction in which secondary air from the upper portion of the cooktop unit (20) is guided toward the inner gas channel (GS1) along the air supply unit (165).

[0153] Looking at the propagation of flame by the pair of transmission flame holes (166a, 166b) mentioned above, when the spark of the ignition device (ignition plug) is transmitted through the discharge hole (125), combustion of the mixed gas occurs in the inner gas channel (GS1). When the mixed gas is combusted in the inner gas channel (GS1), inner flames (F1) are generated and propagated to the inner flame holes (142). (Arrow ② direction)

[0154] In this way, after combustion occurs first in the inner flame holes (142), the inner flames (F1) of the inner flame holes (142) are propagated to the outer gas channel (GS2) through the first transmission flame hole (166a) (arrow ③ direction). Accordingly, combustion may also occur in the outer flame holes (152) to generate outer flames (F2). With reference to Fig. 12, the flame propagated through the first transmission flame hole (166a) may be continuously propagated to a plurality of the outer flame holes (152) in a clockwise direction (arrow ④ direction). Meanwhile, the inner flames (F1) of the inner flame holes (142) are also propagated to the outer gas channel (GS2) through the second transmission flame hole (166b) (arrow ③' direction). The flame propagated through the second transmission flame hole (166b) can be continuously propagated to a plurality of outer flame holes (152) in a counterclockwise direction (direction of arrow ④'). Consequently, the flame can be propagated to the outer flame holes (152) in both directions through the first transmission flame hole (166a) and the second transmission flame hole (166b).

[0155] In the present embodiment, the pair of transmission flame holes (166a, 166b) have different radial distances from the center of the burner head (130). The first transmission flame hole (166a) has a shorter radial distance than the second transmission flame hole (166b) based on the radial direction of the burner head (130). In other words, the distance between the first transmission flame hole (166a) and the inner head wall (141) is shorter than the distance between the second transmission flame hole (166b) and the inner head wall (141).

[0156] In this way, the first transfer flame hole (166a) arranged relatively close to the inner flame holes (142) can play a role in quickly transferring the inner flame (F1) of the inner flame holes (142) to the outer flame holes (152). In addition, the second transfer flame hole (166b) arranged relatively close to the outer flame holes (152) can also play a role in allowing the flames (F2) transferred to the outer flame holes (152) in the clockwise direction to pass across the air supply unit (165) to the outer flame holes (152) on the opposite side.

[0157] Referring again to FIGS. 12 and 14, the burner head (130) is provided with a protrusion (170). The protrusion (170) may be provided in an outer gas channel (GS2) provided inside an outer head portion (150) of the burner head (130). The protrusion (170) may control the pressure and speed of gas flowing through the outer gas channel (GS2), thereby providing a mixed gas evenly throughout the outer gas channel (GS2) and generating an even flame (F2) in the outer flame holes (152).

[0158] Specifically, the protrusion (170) is positioned between the outer head wall (151) and the channel fence (160). The protrusion (170) protrudes in a direction that narrows the distance between the tube outlet (133b) and the bottom surface (193) of the outer burner cap (190) facing the tube outlet (133b). In the present embodiment, the protrusion (170) protrudes from the bottom of the outer gas channel (GS2) toward the bottom surface (193) of the outer burner cap (190).

[0159] The above protrusion (170) can lower the pressure in a portion of the outer gas channel (GS2) formed between the tube outlet (133b) and the bottom surface (193) of the outer burner cap (190). As the speed of the mixed gas increases in a portion of the outer gas channel (GS2) narrowed by the protrusion (170), the pressure drops. Accordingly, a high-pressure rising flame (F2') can be prevented in the outer flame holes (152) formed adjacent to the tube outlet (133b).

[0160] More precisely, the protrusion (170) lowers the width (height) of the outer gas channel (GS2) around the tube outlet (133b) and narrows the cross-sectional area of ​​the outer gas channel (GS2). Around the tube outlet (133b) where the cross-sectional area is narrowed by the protrusion (170), the velocity of the fluid (mixed gas) increases, and the pressure decreases in the direction perpendicular to the extension direction of the outer gas channel (GS2). Therefore, a rising flame (F2') is prevented from the outer flame holes (152). The protrusion (170) may be formed integrally with the bottom surface of the outer gas channel (GS2) or may be configured as a separate object from the burner head (130).

[0161] Meanwhile, the protrusion (170) is formed so that the protrusion height decreases along the circumferential direction of the outer gas channel (GS2). That is, the protrusion (170) decreases the width (height) of the outer gas channel (GS2) around the tube outlet (133b), and as the height decreases along the circumferential direction, the width (height) of the outer gas channel (GS2) gradually increases. As the cross-sectional area of ​​the outer gas channel (GS2) increases toward the outside of the protrusion (170), the velocity of the gas (mixed gas) decreases, and the pressure increases in the direction perpendicular to the extension direction of the outer gas channel (GS2). Accordingly, the mixed gas can smoothly diffuse to the outer flame holes (152) located far from the tube outlet (133b). In Fig. 14, arrow ② represents the circumferential direction, which is one of the directions in which the mixed gas diffuses through the protrusion (170) on the left.

[0162] Fig. 15 illustrates a cross-sectional view of the outer head portion (150) of the burner head (130) and the outer burner cap (190). The outer gas channel (GS2) may include a plurality of channels having different heights due to the protrusion (170). More precisely, the outer gas channel (GS2) includes a first outer gas channel (G2a) that is connected to the tube outlet (133b) and has a first height. A second gas channel (G2b) is connected to the first outer gas channel (G2a) along the circumferential direction of the outer gas channel (GS2) from the first outer gas channel (G2a). The second gas channel (G2b) has a second height. At this time, the second height is formed higher than the first height. Here, the first height and the second height are each based on the direction in which the tube outlet (133b) is opened.

[0163] In addition, the outer gas channel (GS2) may further include a third gas channel (G2c) at a position outside the protrusion (170). The third gas channel (G2c) is connected from the second gas channel (G2b) along the circumferential direction of the outer gas channel (GS2). The third gas channel (G2c) has a third height. At this time, the third height is formed higher than the second height. As a result, the height of the outer gas channel (GS2) may be formed to increase along the circumferential direction from the tube outlet (133b).

[0164] Referring to Fig. 16, the flow path of the mixed gas is indicated by an arrow. At this time, the mixed gas passing through the tube outlet (133b) can flow along the outer gas channel (GS2). As illustrated, the outer gas channel (GS2) gradually widens in the circumferential direction (left and right based on the drawing) from the tube outlet (133b). The shape of this outer gas channel (GS2) affects the velocity and pressure of the mixed gas.

[0165] In this embodiment, both ends of the third gas channel (G2c) are respectively connected to two different second gas channels (G2b). The two different second gas channels (G2b) formed by the two protrusions (170) are connected to each other by the third gas channel (G2c), thereby creating a continuous gas supply path.

[0166] As shown in Fig. 15, the outer gas channel (GS2) can gradually widen in the left and right directions with the protrusion (170) as the center. In addition, the outer mixing tube (133) is provided at the lower portion of the protrusion (170), so that the outer tube flow path (T2) is connected to the outer gas channel (GS2).

[0167] The outer gas channel (GS2) is formed between the outer head portion (150) and the bottom surface (193) of the outer burner cap (190). The protrusion (170) may extend to both sides of the tube outlet (133b) with the tube outlet (133b) as the center. Accordingly, the outer gas channel (GS2) is symmetrical in the circumferential direction (left-right direction based on FIG. 15) with the protrusion (170) as the center. More precisely, the protrusion (170) surrounds the edge of the tube outlet (133b), and the outer gas channel (GS2) is symmetrical in the circumferential direction with the protrusion (170) as the center. Accordingly, the outer gas channel (GS2) may be viewed as having a symmetrical structure with respect to the tube outlet (133b).

[0168] The above protrusion (170) may protrude toward the inside of the outer gas channel (GS2). Accordingly, the outer gas channel (GS2) has a cross-section (upper and lower height based on the drawing) that becomes narrower at the protrusion (170) and a relatively wider cross-section at a position away from the protrusion (170). As described above, the protrusion (170) gradually decreases in a protruding height along the circumferential direction of the outer gas channel (GS2) from the edge of the tube outlet (133b), so that the height of the outer gas channel (GS2) around the tube outlet (133b) and the height of the outer gas channel (GS2) at a position completely away from the protrusion (170), as well as the height of an intermediate region therebetween, may be different from each other.

[0169] Referring to Fig. 14, the width of the protrusion (170) based on the radial direction of the burner head (130) may be formed smaller than the radial width of the outer gas channel (GS2). At this time, the width of the protrusion (170) based on the radial direction of the burner head (130) may be formed to narrow along the circumferential direction of the outer gas channel (GS2). That is, the protrusion (170) may be formed to be widest at the edge of the tube outlet (133b) and may become narrower as it moves away from the tube outlet (133b). Accordingly, the volume of the outer gas channel (GS2) may become larger in the direction away from the tube outlet (133b), thereby effectively allowing the mixed gas to diffuse.

[0170] Looking at the structure of the above-mentioned protrusion (170), the above-mentioned protrusion (170) includes a first protrusion body (171) that surrounds the edge of the tube outlet (133b). The above-mentioned protrusion (170) includes a second protrusion body (173) that extends from the first protrusion body (171) along the circumferential direction of the outer gas channel (GS2). Here, the protrusion height of the second protrusion body (173) gradually decreases along the circumferential direction of the outer gas channel (GS2). The upper surface of the first protrusion body (171) may have a planar structure, or, like the second protrusion body (173), the protrusion height may gradually decrease along the circumferential direction of the outer gas channel (GS2).

[0171] A protruding end (175) may be provided at the end of the second protruding body (173). The protruding end (175) is a portion connecting the bottom surface of the outer gas channel (GS2) and the second protruding body (173). The protruding end (175) may be an inclined surface or a curved surface extending in the vertical direction. The protruding end (175) may extend at a different angle from the surface of the second protruding body (173) toward the bottom surface of the outer gas channel (GS2). By the protruding end (175), a predetermined height difference is generated between the upper surface of the second protruding body (173) and the bottom surface of the outer gas channel (GS2). The difference in cross-sectional area between the second gas channel (G2b) and the third gas channel (G2c) may rapidly increase based on the protruding end (175). Through this, diffusion of the mixed gas and mixing with the primary air in the third gas channel (G2c) can be more effectively achieved.

[0172] As previously discussed, the burner head (130) may be provided with a plurality of outer mixing tubes (133). At this time, the plurality of outer mixing tubes (133) may be spaced apart from each other in the circumferential direction of the outer gas channel (GS2). The protrusions (170) may be provided in the tube outlets (133b) formed in the plurality of outer mixing tubes (133), respectively. As shown in Fig. 14, in the present embodiment, two tube outlets (133b) and two protrusions (170) are respectively arranged in the outer gas channel (GS2) with a phase difference of 180 degrees.

[0173] The outer gas channel (GS2) can form a continuous path between the plurality of protrusions (170). When the outer gas channel (GS2) forms a continuous path between the plurality of protrusions (170), the mixed gas diffused through the plurality of protrusions (170) can smoothly flow along the continuous path and quickly propagate the outer flames (F2). In addition, when the outer gas channel (GS2) forms a continuous path between the plurality of protrusions (170), the number of the outer mixing tube (133) and the protrusions (170) can be reduced.

[0174] Referring to FIG. 15, among the plurality of outer flame holes (152), the outer flame holes (152A) arranged at a position relatively close to the tube outlet (133b) may be formed smaller than the outer flame holes (152B) arranged at a position relatively far from the tube outlet (133b). This is to reduce the amount of mixed gas discharged through the outer flame holes (152A) located close to the tube outlet (133b), thereby preventing a rising flame (F2') from forming in the outer flame holes (152A) around the tube outlet (133b). In this way, in the present embodiment, by reducing the size of the outer flame holes (152A) around the tube outlet (133b) where the protrusion (170) is arranged, the probability of occurrence of a rising flame (F2') can be significantly reduced through the size of the outer flame holes (152) together with the protrusion (170).

[0175] Looking more closely, as shown in Fig. 14, the plurality of outer flame holes (152) include a first flame hole (152A) arranged in an area (X1) between two imaginary extension lines passing through the center of the burner head (130) and the opposite edges of the tube outlet (133b), respectively. In addition, the plurality of outer flame holes (152) include a second flame hole (152B) arranged at a position outside the area between the two imaginary extension lines. At this time, the second flame hole (152B) is formed larger than the first flame hole (152A).

[0176] As another example, among the plurality of outer flame holes (152), the outer flame hole (152A) arranged in the same radial region as the tube outlet (133b) based on the radial direction of the burner head (130) is formed smaller than the outer flame hole (152B) arranged at a position outside the same radial region as the tube outlet (133b). Here, the radial region means the region where the center of the burner head (130) and the tube outlet (133b) overlap in the radial direction.

[0177] Meanwhile, the outer flame holes (152) may be arranged along the outer head wall (151) of the burner head (130). The surface of the protrusion (170) may be spaced apart from the surface of the outer head wall (151). Accordingly, a predetermined space (S1) may be formed between the side surface of the protrusion (170) and the inner surface of the outer head wall (151). A mixed gas may be diffused and stored in the predetermined space (S1). The mixed gas is stored in this predetermined space (S1), so that the outer flame can be maintained even if the supply of the mixed gas is temporarily not smooth.

[0178] Referring to FIG. 17, which is an enlarged view of part A of FIG. 15, the upper end of the protrusion (170) can be spaced downward from the lower end of the outer flame holes (152), i.e., in the direction in which the tube outlet (133b) is opened. Together with the upper end of the protrusion (170), the tube outlet (133b) can also be spaced vertically, i.e., in the height direction, from the lower end of the outer flame holes (152). In FIG. 15, the reference numeral G indicates the height at which the upper end of the protrusion (170) and the lower end of the outer flame holes (152) are spaced apart from each other.

[0179] More precisely, the lower end of the first flame hole (152A) and the upper end of the protrusion (170), and the first flame hole (152A) and the tube outlet (133b) are spaced apart from each other. In this way, a predetermined buffer area is created between the upper end of the protrusion (170) and the first flame holes (152A), and lifting of the outer flame can be prevented as the mixed gas is directly discharged to the first flame holes (152A).

[0180] The height at which the protrusion (170) protrudes from the surface of the burner head (130) may be less than or equal to the distance between the protrusion (170) and the outer burner cap (190). The height of the protrusion (170) at the highest position of the protrusion (170), i.e., at the edge of the tube outlet (133b), is less than or equal to the distance between the bottom surface (193) of the outer burner cap (190) and the protrusion (170). In this way, the width of the outer gas channel (GS2) can be prevented from being excessively narrowed due to the protrusion (170).

[0181] In this embodiment, the height of the outer gas channel (GS2) at a position outside the protrusion (170) is formed to be between 2 and 3.5 times the height at which the protrusion (170) protrudes from the surface of the burner head (130). Compared to the height of the protrusion (170) at the highest position of the protrusion (170), i.e., at the edge of the tube outlet (133b), the height of the outer gas channel (GS2) at a position outside the protrusion (170) is between 2 and 3.5 times. In this way, the pressure of the mixed gas lowered by the protrusion (170) and the speed of the mixed gas increased can be optimized.

[0182] Referring to Fig. 14, the circumferential angular range of the outer gas channel (GS2) based on the center of the burner head (130) is between 2.5 and 5.5 times the circumferential angular range (X2) of the protrusion (170). Here, the circumferential angular range of the outer gas channel (GS2) can be viewed as an area through which an arc extending along the circumferential direction of the outer gas channel (GS2) passes, excluding the air supply unit (165). The circumferential angular range of the protrusion (170) can be viewed as an area through which an arc connecting both ends of the protrusion (170) passes in the circumferential direction of the outer gas channel (GS2). In this embodiment, when the circumferential angular range of the outer gas channel (GS2) is 2.5 to 5.5 times the circumferential angular range (X2) of the protrusion (170), the entire volume of the outer gas channel (GS2) can be prevented from being excessively narrowed by the protrusion (170), and the diffusion speed and pressure of the mixed gas are optimized by the protrusion (170).

[0183] In other words, the circumferential arc distance of the outer gas channel (GS2) based on the center of the burner head (130) is between 2.5 and 5.5 times the circumferential arc distance of the protrusion (170).

[0184] Meanwhile, Fig. 18 conceptually illustrates a flow path of a mixed gas formed inside a burner head (130) constituting an embodiment of the present invention. The mixed gas may flow along the direction of the arrow in Fig. 18. The flow path of the mixed gas may include an inlet (133a) of the outer tube passage (T2), the inside of the outer tube passage (T2), the tube outlet (133b), the first gas channel (G2a), the second gas channel (G2b), and the third gas channel (G2c) constituting the outer gas channel (GS2).

[0185] More precisely, the inside of the outer tube passage (T2) has a shape that gradually narrows from the inlet (133a) of the outer tube passage (T2). Therefore, the air (primary air) around the inlet (133a) of the outer tube passage (T2) is sucked into the inside of the outer tube passage (T2) by the Venturi effect and mixed with the gas inside the outer tube passage (T2). At this time, looking at the gas drive by the outer tube passage (T2), which is a type of Venturi tube, the mixed gas, which is a mixture of primary air and gas around the inlet (133a) of the outer tube passage (T2), can enter the inside of the outer tube passage (T2) and then rise to the point where the width of the outer tube passage (T2) narrows. In this way, the flow speed of the mixed gas increases at the narrowing point inside the outer tube passage (T2) and becomes relatively lower than the surrounding pressure, so that a suction force is generated from the bottom to the top.

[0186] And, as the width of the outer tube channel (T2) widens, the mixed gas, etc., diffuses. In Fig. 18, the inlet (133a) of the outer tube channel (T2) is indicated as a first point (P1), and the area where the width of the outer tube channel (T2) widens again is indicated as a second point (P2). In this way, by the principle of generating negative pressure as a venturi effect of the outer tube channel (T2), the mixed gas can easily diffuse to both sides of the outer gas channel (GS2), and the gas and primary air can be better mixed.

[0187] The first gas channel (G2a) surrounding the tube outlet (133b) can be seen at a third point (P3). On both sides of the third point (P3), a fourth point (P4) is located where the second gas channel (G2b) is formed. A third gas channel (G2c) is connected to the second gas channel (G2b), and the protrusion (170) is omitted from the third gas channel (G2c). This part can be seen as a fifth point (P5).

[0188] In the present embodiment, the first to fifth points (P1-P5) may have different cross-sectional areas. Accordingly, the mixed gas may flow at different speeds and pressures at the first to fifth points (P1-P5). Fig. 19 shows a graph of the speed and pressure of the mixed gas at each point. As can be seen, the mixed gas rising at the first point (P1) increases in speed, but at the second point (P2), the width of the flow path widens and the speed decreases. In addition, at the third point (P3), the width of the outer gas channel (GS2) is greatly narrowed due to the protrusion (170), so that the speed of the mixed gas may increase significantly again.

[0189] At this time, as the speed of the mixed gas increases at the third point (P3), the pressure of the mixed gas may decrease. Accordingly, the rising flame (F2') due to excessive pressure in the first flame hole (152A) located at the third point (P3) may be suppressed.

[0190] As the gas mixture passes through the increasingly wider fourth point (P4) and fifth point (P5), its velocity gradually decreases while its pressure increases. During this process, the gas mixture can be effectively diffused and smoothly supplied to the second flame hole (152B) located far from the tube outlet (133b).

[0191] Meanwhile, in the present embodiment, the area of ​​the protrusion (170) is formed to be 3 to 5 times the area of ​​the tube outlet (133b). The area of ​​the protrusion (170) can be designed in proportion to the area of ​​the tube outlet (133b). The area of ​​the tube outlet (133b) varies depending on the diameter (R, see FIG. 14) of the tube outlet (133b), and the area of ​​the protrusion (170) based on a plane is 3 to 5 times the area of ​​the tube outlet (133b). In this way, the protrusion (170) can control the pressure / speed of the mixed gas in response to the pressure / speed of the mixed gas around the tube outlet (133b) that varies depending on the area of ​​the tube outlet (133b).

[0192] Referring to Fig. 20, the combustion uniformity of the outer flame holes (152) according to the ratio of the area of ​​the protrusion (170) to the area of ​​the tube outlet (133b) is shown. Here, the combustion uniformity is calculated by measuring (i) the shape of the outer flame (F2) generated in each outer flame hole (152), such as the width and length, and (ii) the temperature for each phase of each outer flame hole (152). At this time, the closer the uniformity is to 1, the smaller the difference between the largest value and the smallest value among the measured values. As can be seen in the drawing, when the ratio of the area of ​​the protrusion (170) to the area of ​​the tube outlet (133b) is between 3 and 5 times, the combustion uniformity is significantly higher compared to other area ratios. Therefore, it is preferable that the ratio of the area of ​​the protrusion (170) to the area of ​​the tube outlet (133b) is between 3 and 5 times.

[0193] FIG. 21 illustrates a second embodiment of a burner head (130) constituting a burner device of a cooking appliance according to the present invention. Descriptions of the same parts as those of the previously described embodiments will be omitted. As shown in FIG. 21, the protrusion (170) includes a first protrusion body (171) and a second protrusion body (173). Both ends of the second protrusion body (173) are connected to the first protrusion body (171) and the bottom surface of the outer gas channel (GS2), respectively. The second protrusion body (173) may have a continuous inclined surface or curved surface structure whose height gradually decreases from the first protrusion body (171) toward the bottom surface of the outer gas channel (GS2). Accordingly, there is no step structure between the end of the protrusion (170) and the bottom surface of the outer gas channel (GS2), and a continuous surface may be formed.

[0194] Fig. 22 illustrates a third embodiment of a burner head (130) constituting a burner device of a cooking appliance according to the present invention. Descriptions of the same parts as those in the previously described embodiments will be omitted. As shown in Fig. 22, the protrusion (170) includes a first protrusion body (171) and a second protrusion body (173). The second protrusion body (173) may extend in a stepwise manner from the first protrusion body (171) toward the bottom surface of the outer gas channel (GS2). That is, the second protrusion body (173) may have a structure in which the height thereof gradually decreases along the circumferential direction, but the heights of both sides are different based on a specific point.

[0195] FIG. 23 illustrates a plan view of a fourth embodiment of a burner head (130) constituting a burner device of a cooking appliance according to the present invention. Descriptions of the same parts as those of the previously described embodiments will be omitted. As shown in FIG. 23, the protrusion (170) can extend in either direction along the circumference centered on the outlet of the outer mixing tube (133). The protrusion (170) positioned at the 12 o'clock direction and the protrusion (170) positioned at the 6 o'clock direction based on the drawing each extend clockwise. In this way, the mixed gas can diffuse more smoothly in either direction. In the present embodiment, an outer gas channel (GS2) that is continuous with each other is formed between the two protrusions (170), so that the mixed gas can diffuse more quickly in either direction.

[0196] Fig. 24 is an enlarged plan view of a fifth embodiment of a burner head (130) constituting a burner device of a cooking appliance according to the present invention. Descriptions of the same parts as the previously described embodiments will be omitted. As shown in Fig. 24, the protrusion (170) may be formed to have a width that gradually narrows along the circumferential direction. The second protrusion body (173) connected to the first protrusion body (171) of the protrusion (170) has a width that gradually narrows along the circumferential direction of the outer gas channel (GS2).

[0197] At this time, the distance at which the second protruding body (173) is spaced from the outer flame holes (152) may also vary. The second protruding body (173) may be formed to be increasingly spaced from the outer flame holes (152) along the circumferential direction. In this way, a predetermined chamber in which a mixed gas can stay can be formed between the second protruding body (173) and the outer head wall (151) in which the outer flame holes (152) are arranged. Such a chamber can maintain the outer flame even if the supply of the mixed gas is temporarily not smooth.

[0198] Fig. 25 is an enlarged plan view of a sixth embodiment of a burner head (130) constituting a burner device of a cooking appliance according to the present invention. Descriptions of the same parts as the previously described embodiments will be omitted. As shown in Fig. 25, the protrusion (170) may be formed to have a width that gradually narrows along the circumferential direction. The second protrusion body (173) connected to the first protrusion body (171) of the protrusion (170) has a width that gradually narrows along the circumferential direction of the outer gas channel (GS2).

[0199] At this time, the distance at which the second protruding body (173) is spaced from the outer flame holes (152) may also vary. The second protruding body (173) may be formed to be increasingly spaced from the channel fence (160) along the circumferential direction. In this way, a predetermined chamber in which a mixed gas can remain may be formed between the second protruding body (173) and the channel fence (160). This chamber can maintain the outer flame even if the supply of the mixed gas is temporarily not smooth.

[0200] Fig. 26 is an enlarged plan view of a seventh embodiment of a burner head (130) constituting a burner device of a cooking appliance according to the present invention. Descriptions of the same parts as the previously described embodiments will be omitted. As shown in Fig. 26, there is no separation between the second protruding body (173) of the protruding portion (170) and the outer head wall (151) in which the outer flame holes (152) are formed, and no empty space is formed therebetween. That is, the second protruding body (173) and the outer head wall (151) are in close contact with each other. In addition, there is no separation between the second protruding body (173) and the channel fence (160).

[0201] Fig. 27 is an enlarged plan view of an eighth embodiment of a burner head (130) constituting a burner device of a cooking appliance according to the present invention. Descriptions of the same parts as the previously described embodiments will be omitted. As shown in Fig. 27, the protrusion (170) becomes narrower in width from the second protrusion body (173) to the protruding end (175). Here, the width refers to the radial length of the outer gas channel (GS2). As the protruding end (175) becomes narrower in the circumferential direction, the empty space between the protruding end (175) and the outer head wall (151) and between the protruding end (175) and the channel fence (160) can be secured increasingly wider.

[0202] FIG. 28 is an enlarged cross-sectional view showing a burner head (130) and an outer burner cap (190) constituting a ninth embodiment of a burner of a cooking appliance according to the present invention. Descriptions of the same parts as those of the previously described embodiments will be omitted. As shown in FIG. 28, the protrusion (1170) is provided on the outer burner cap (190). The protrusion (1170) is provided on the bottom surface of the outer gas channel (GS2), that is, on the bottom surface (193) of the outer burner cap (190) rather than on the burner head (130). The protrusion (1170) protrudes from the bottom surface (193) of the outer burner cap (190) toward the bottom surface of the outer gas channel (GS2). In this way, the vertical width of the outer gas channel (GS2) can be narrowed around the outlet (133b) of the tube. Although not shown, as another example, the protrusion (1170) may be provided on the bottom surface (193) of the outer burner cap (190) and the bottom surface of the outer gas channel (GS2), respectively.

[0203] Meanwhile, as another example, the inner head portion (140) and the outer head portion (150) may have the same diameter and be arranged at different heights. In this way, the inner flames and the outer flames may be formed with the same diameter.

[0204] As another example, the inner head portion may be omitted from the burner head (130). If the inner head portion is omitted, the outer mixing tube (133) may be referred to as a mixing tube (130), the outer head portion (150) may be referred to as a head portion (150), the outer gas channel (GS2) may be referred to as a gas channel (GS2), the outer flame holes (152) may be referred to as flame holes (152), and the outer tube path (T2) may be referred to as a tube path (T2).

[0205] As another example, the protrusion (170) may be provided on the surface of the burner head (130) forming the side wall of the outer gas channel (GS2). That is, the protrusion (170) may protrude from the surface of the outer head wall (151) or the surface of the channel fence (160). At this time, the protrusion (170) may surround at least a portion of the edge of the tube outlet (133b). In addition, the protrusion (170) may protrude in a direction that narrows the width of the outer gas channel (GS2) based on the radial direction of the burner head (130).

[0206] As another example, the burner body (110) may be omitted, or the burner body (110) may be integrally provided within the cooktop unit (20). Alternatively, the burner body (110) may become a part of the burner head (130).

[0207] The above description is merely an illustrative illustration of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate, rather than limit, the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims

1. A burner head having multiple flame holes; A burner cap laminated to the burner head and forming a gas channel between itself and the burner head; A mixing tube provided in the burner head, providing a mixed gas, and having a tube outlet open toward the gas channel; and It includes a protrusion provided on either the surface of the burner head forming the gas channel or the surface of the burner cap forming the gas channel; A cooking appliance in which the above-mentioned protrusion is formed such that the protrusion height decreases along the circumferential direction of the gas channel.

2. A cooking device according to claim 1, wherein the protrusion protrudes in a direction that reduces the distance between the tube outlet and the surface of the burner cap facing the tube outlet.

3. The cooking device of claim 1, wherein the protrusion surrounds the edge of the tube outlet.

4. A cooking device according to claim 1, wherein the height of the protrusion protruding along the circumferential direction of the gas channel from the edge of the tube outlet gradually decreases.

5. A cooking device according to claim 1, wherein the protrusion protrudes from the surface of the burner cap toward the tube outlet.

6. A cooking device according to claim 1, wherein the protrusions extend to both sides of the tube outlet, centered on the tube outlet.

7. A cooking appliance according to Claim 1, wherein the width of the protrusion based on the radial direction of the burner head is formed to narrow along the circumferential direction of the gas channel.

8. In claim 1, the burner head is provided with a plurality of the mixing tubes, and The plurality of mixing tubes are spaced apart from each other in the circumferential direction of the gas channel, and The above-mentioned protrusions are cooking devices provided at the respective tube outlets of the plurality of mixing tubes.

9. A cooking device according to claim 8, wherein the gas channel forms a continuous path between the plurality of protrusions.

10. In claim 1, the gas channel is formed along the circumferential direction of the burner head, and A cooking appliance in which a plurality of the above-mentioned protrusions are provided in the above-mentioned gas channel at spaced apart along the circumferential direction.

11. In Claim 1, the protrusion A first protruding body wrapping the edge of the above-mentioned tube outlet; and It includes a second protruding body extending along the circumferential direction of the gas channel from the first protruding body; The above second protruding body is a cooking device in which the protrusion height gradually decreases along the circumferential direction of the gas channel.

12. A cooking appliance according to claim 11, wherein a protruding end portion is formed at the end of the second protruding body and extends at a different angle from the surface of the second protruding body toward the bottom surface of the gas channel.

13. In claim 1, the gas channel is A first gas channel connected to the above-mentioned tube outlet and having a first height; and, A second gas channel connected along the circumferential direction of the first gas channel and having a second height; comprising, The above second height is a cooking appliance that is higher than the above first height.

14. A cooking appliance according to Claim 1, wherein the width of the protrusion based on the radial direction of the burner head is narrower than the radial width of the gas channel.

15. A cooking device according to claim 1, wherein the height of the gas channel is formed to increase along the circumferential direction from the tube outlet.

16. In claim 1, the flame holes are arranged along the head wall of the burner head, and A cooking appliance in which the surface of the above-mentioned protrusion is spaced apart from the surface of the head wall.

17. A cooking device according to claim 1, wherein the upper end of the protrusion is spaced apart from the lower end of the flame holes in the direction of the tube outlet.

18. A cooking device according to claim 1, wherein among the plurality of salt holes, salt holes arranged at a position relatively close to the tube outlet are smaller than salt holes arranged at a position relatively far from the tube outlet.

19. In claim 1, a cooking appliance in which, among the plurality of flame holes, flame holes arranged in the same radial area as the tube outlet based on the radial direction of the burner head are smaller than flame holes arranged at a position outside the same radial area as the tube outlet.

20. Burner head having multiple flame holes; A burner cap laminated to the burner head above; A mixing tube provided in the burner head, providing a mixed gas, and having a tube outlet open toward the gas channel; and A gas channel formed between the burner head and the burner cap and connected to the plurality of flame holes; comprising The above gas channel A first gas channel connected to the above-mentioned tube outlet and having a first height relative to the direction in which the above-mentioned tube outlet is open; and, A second gas channel connected along the circumferential direction of the gas channel from the first gas channel and having a second height based on the direction in which the tube outlet is opened; The above second height is a cooking appliance that is higher than the above first height.

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