Gas burners and cooking appliances for stoves

Abstract

To prevent the temperature of a burner cap from rising when a gas burner for a stove is used.SOLUTION: A gas burner 1 for a stove includes a cylindrical burner cap 11, an annular brim part 12, and a ventilation channel 4. The burner cap 11 has: a through-hole 110 that penetrates upward and downward in a center part thereof, and a plurality of flame holes 115 in an outer peripheral part thereof. The brim part 12 is provided above the burner cap 11. The ventilation channel 4 is formed between the burner cap 11 and the brim part 12 to allow ventilation inside and outside in a radial direction. An outer diameter of the brim part 12 is larger than an outer diameter of the burner cap 11. A lower surface 1225 of an outer circumferential part 122 of the brim 12 that extends radially outward from the burner cap 11 is located below an upper surface 118 of the burner cap 11.SELECTED DRAWING: Figure 4

Description

Technical Field

[0006] , ,

[0001] The present disclosure relates to a gas burner for a stove and a cooking appliance equipped with the same.

Background Art

[0002] Patent Document 1 discloses a gas burner and a cooking appliance equipped with the same. The gas burner includes a burner cap having a through-hole penetrating vertically, and a plurality of flame holes are provided on the outer peripheral portion of the burner cap so as to be arranged in the circumferential direction of the burner cap. The flame of the gas burner is generated by a mixture gas ejected from each flame hole of the burner cap.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described gas burner, due to the influence of the flame generated by the mixture gas ejected from each flame hole, the temperature of the burner cap rises, and in some cases, the deterioration of the burner cap may progress due to the temperature rise. In order to suppress the deterioration of the burner cap, it is desirable to suppress the temperature rise of the burner cap.

[0005] An object of the present disclosure is to provide a gas burner for a stove that can suppress the temperature rise of the burner cap during use, and a cooking appliance equipped with the same.

Means for Solving the Problems

[0006] A gas burner for a stove according to one aspect of the present disclosure comprises a cylindrical burner cap having a through hole extending vertically through its center and a plurality of flame holes on its outer circumference, an annular flange provided above the burner cap, and a ventilation passage formed between the burner cap and the flange to allow for radial ventilation inward and outward. The outer diameter of the flange is larger than the outer diameter of the burner cap. The lower surface of the outer peripheral portion of the flange that protrudes radially outward from the burner cap is located below the upper surface of the burner cap.

[0007] A heating appliance according to one aspect of the present disclosure comprises a gas burner for a stove and a cooking appliance body to which the gas burner for the stove is attached. [Effects of the Invention]

[0008] This disclosure has the effect of suppressing the temperature rise of the burner cap that occurs when using a gas burner for a stove. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a plan view of a heating appliance according to one embodiment. [Figure 2] Figure 2 is a plan view of a high-power gas burner for a stove installed in the same cooking appliance. [Figure 3] Figure 3 is a cross-sectional view taken along line AA in Figure 2. [Figure 4] Figure 4 is an enlarged view of the main part of Figure 3. [Figure 5] Figure 5 is a front view of the gas burner for the stove shown above. [Figure 6] Figure 6 is a cross-sectional view along line BB in Figure 5. [Figure 7] Figure 7 is an exploded perspective view of the flange and burner cap of the gas burner for the stove shown above. [Figure 8] Figure 8 is a perspective view of the flange portion shown above. [Figure 9]Figure 9A is a cross-sectional view of the main part showing a pot being heated on low heat using the same gas burner for stovetop. Figure 9B is a cross-sectional view of the main part showing a pot being heated on low heat using the gas burner for stovetop of Comparative Example 1. Figure 9C is a cross-sectional view of the main part showing a pot being heated on low heat using the gas burner for stovetop of Comparative Example 2. [Figure 10] Figure 10 is a plan view of a low-power gas burner for a stove installed on the same cooking appliance. [Figure 11] Figure 11 is a cross-sectional view along line CC of Figure 10. [Modes for carrying out the invention]

[0010] (1) Embodiment Figure 1 shows a heating appliance 9 according to one embodiment. The heating appliance 9 according to one embodiment is a gas stove, and more specifically, a drop-in type gas stove installed on a kitchen counter (not shown). The directions used in the following text are based on the state in which the heating appliance 9 is installed.

[0011] (1.1)Heating cooker One embodiment of the cooking appliance 9 comprises a gas burner 1 for a stove (hereinafter simply referred to as "gas burner 1") and a cooking appliance body 7 to which the gas burner 1 is attached.

[0012] The cooking appliance body 7 has a casing 72 and a top plate 74. The box-shaped outer shell of the cooking appliance body 7 is composed of the casing 72 and the top plate 74. The casing 72 is a rectangular box-shaped casing with an opening that is open upwards. The top plate 74 is installed on the casing 72 so as to cover the opening of the casing 72.

[0013] Multiple holes 76 are formed vertically through the top plate 74, and a portion of the gas burner 1 corresponding to each hole 76 protrudes upward through each hole 76. In one embodiment of the cooking appliance 9, two gas burners 1 are installed on the left and right sides, and one other gas burner 1 is installed behind these left and right gas burners 1.

[0014] The left and right gas burners 1 are gas burners with a higher heating power compared to the rear gas burner 1. In other words, the left and right gas burners 1 are high-heating-power gas burners, and the rear gas burner 1 is a low-heating-power gas burner.

[0015] The cooker body 7 further has a plurality of operation parts 78. In the heating cooker 9 of one embodiment, by operating at least one of the plurality of operation parts 78, switching between ignition and extinguishing of the corresponding gas burner 1 and adjustment of the heating power of the corresponding gas burner 1 are performed.

[0016] Furthermore, the heating cooker 9 of one embodiment includes a plurality of trivets 8 installed on the upper surface of the cooker body 7. The plurality of trivets 8 are three trivets that correspond one-to-one to the three gas burners 1. Each trivet 8 is installed on the upper surface of the top plate 74 so as to surround a part of the gas burner 1 corresponding to each trivet 8 (the burner cap 11 and the flange part 12 described later).

[0017] (1.2) Gas burner for stove Figures 2 to 9 show one of the high-heating-power gas burners 1 arranged side by side on the left and right. In the following, based on the high-heating-power gas burner 1 shown in Figures 2 to 9, the detailed structure of the gas burner 1 of this embodiment will be described.

[0018] The gas burner 1 includes a cylindrical burner cap 11, an annular flange part 12, a bottom temperature sensor 13, a burner body 14, and a spark plug 15. The flange part 12 is composed of a burner cover 2 and a lower member 3. As shown in Figure 4, a ventilation path 4 is formed between the burner cap 11 and the flange part 12 (that is, the burner cover 2 and the lower member 3).

[0019] (1.2.1) Burner cap As shown in Figure 3, etc., the burner cap 11 is a cylindrical member that penetrates vertically. The burner cap 11 is made of, for example, an aluminum alloy. The cylindrical burner cap 11 has a through hole 110 that penetrates vertically in its central part and a plurality of flame holes 115 in its outer circumference (see Figures 5 and 7, etc.).

[0020] The burner cap 11 comprises a cylindrical inner cylinder portion 111 having a through hole 110, a cylindrical outer cylinder portion 113 located radially outward from the inner cylinder portion 111, and a connecting portion 117 connecting the upper parts of the inner cylinder portion 111 and the outer cylinder portion 113. In this specification, "radial direction" refers to the radial direction of the burner cap 11.

[0021] The inner cylinder portion 111 and the outer cylinder portion 113 are located concentrically in a plan view. In this specification, when "plan view" is used, it means the view taken along the axis of the through hole 110.

[0022] The lower part of the inner cylinder portion 111 is located below the outer cylinder portion 113. The upper part of the outer cylinder portion 113 is located above the inner cylinder portion 111. The upper surface of the outer cylinder portion 113 constitutes the upper surface 118 of the burner cap 11. From the upper surface 118, a plurality of support portions 119 for supporting the flange portion 12 (i.e., the burner cover 2 and the lower member 3), and a plurality of protrusions 112 that are shorter than the plurality of support portions 119, protrude upward.

[0023] As shown in Figure 7, the multiple support parts 119 are arranged at a distance from each other in the circumferential direction. In this specification, "circumferential direction" refers to the circumferential direction of the burner cap 11. Each of the multiple support parts 119 is columnar and has a flat upper surface. The upper surfaces of the multiple support parts 119 are at the same height. A lower member 3, which constitutes part of the flange 12, is placed on the upper surface of each support part 119.

[0024] Each of the multiple protrusions 112 is positioned between two support parts 119 that are adjacent to each other in the circumferential direction. The support parts 119 and the protrusions 112 are positioned alternately in the circumferential direction.

[0025] The multiple protrusions 112 include multiple protrusions 112A, each having a recess 114 on its upper surface, and multiple protrusions 112B, which do not have a recess 114 on their upper surface. In one embodiment of the gas burner 1, a recess 114 is provided on the upper surface of each of the six protrusions 112A. The six recesses 114 are arranged at a distance from each other in the circumferential direction. Each recess 114 is a recess into which a projection 31, described later, of the lower member 3 is inserted.

[0026] The protrusions 112A and 112B are positioned alternately in the circumferential direction. The protrusion 120B, which has a flat upper surface without a recess 114, is positioned between two adjacent support portions 119, preventing the projection 31 of the lower member 3 from being mistakenly inserted between these two support portions 119.

[0027] In one embodiment of the gas burner 1, the upper surface of each protrusion 112 (112A, 112B) is set lower (for example, 0.1 mm lower) than the upper surface of each support portion 119, thereby suppressing contact between each protrusion 112 and the lower member 3, and reducing the flow of heat from the burner cover 2 to the burner cap 11.

[0028] Multiple flame holes 115 are formed in the outer cylindrical portion 113 of the burner cap 11. The multiple flame holes 115 are arranged at a distance from each other in the circumferential direction. Each flame hole 115 opens radially outward, radially inward, and downward. When the burner cap 11 is placed on the burner body 14, the lower openings of each flame hole 115 are blocked by the burner body 14.

[0029] The connecting portion 117 of the burner cap 11 is inclined overall, with the upper portion being located radially outward. The connecting portion 117 is formed such that the slope gradually decreases towards the upper portion. In other words, it is formed such that the slope gradually decreases towards the radially outward portion.

[0030] (1.2.2) Guard The flange portion 12 is provided above the burner cap 11 so as to cover the upper surface 118 of the burner cap 11. As described above, in one embodiment of the gas burner 1, the flange portion 12 is composed of the burner cover 2 and the lower member 3. The burner cover 2 and the lower member 3 are separate components. The overall structure of the flange portion 12 will be explained first.

[0031] The flange portion 12 is fixed to the upper end of the burner cap 11 so as to be positioned above the burner cap 11. The flange portion 12 and the burner cap 11 are fixed together by mutual engagement, but they may also be fixed by other means such as screws.

[0032] As shown in Figure 3, the flange portion 12 includes an outer peripheral portion 122 that extends radially outward from the burner cap 11, an inner peripheral portion 121 that is radially inward from the outer peripheral portion 122, and an inner cylindrical portion 123 that is located radially inward of the flange portion 12. The inner cylindrical portion 123 is a cylindrical portion having a through hole that penetrates vertically, and this through hole communicates with the through hole 110 of the burner cap 11 located below it.

[0033] As shown in Figure 4, the vertical thickness T2 of the outer peripheral portion 122 of the flange 12 is greater than the vertical thickness T1 of the inner peripheral portion 121 of the flange 12. In other words, the outer peripheral portion 122 of the flange 12 is formed to be thicker in the vertical direction than the inner peripheral portion 121 of the flange 12.

[0034] The vertical thickness T3 of the inner cylinder portion 123 of the flange portion 12 is greater than the vertical thickness T1 of the inner circumference portion 121, and also greater than the vertical thickness T2 of the outer circumference portion 122. In other words, the inner cylinder portion 123 of the flange portion 12 is formed to be thicker in the vertical direction than the inner circumference portion 121 and the outer circumference portion 122.

[0035] (1.2.3) Burner cover The burner cover 2 is an annular member formed separately from the burner cap 11 and constitutes the main body of the flange portion 12. The burner cover 2 is provided above the burner cap 11 so as to cover the upper surface 118 of the burner cap 11. The burner cover 2 is fixed to the upper end portion of the burner cap 11 via the lower member 3 so as to be positioned above the burner cap 11.

[0036] The burner cover 2 includes an outer peripheral portion 22 that extends radially outward from the burner cap 11, an inner peripheral portion 21 that is radially inward from the outer peripheral portion 22, and an inner cylindrical portion 23 that is located radially inward of the burner cover 2.

[0037] In one embodiment of the gas burner 1, the outer circumference portion 22 of the burner cover 2 constitutes the outer circumference portion 122 of the flange portion 12, and the inner circumference portion 21 of the burner cover 2 and the lower member 3 constitute the inner circumference portion 121 of the flange portion 12. Furthermore, the inner cylinder portion 23 of the burner cover 2 constitutes the inner cylinder portion 123 of the flange portion 12. The outer diameter dimension W of the burner cover 2 is the same as the outer diameter dimension W of the flange portion 12. The dimension Y by which the burner cover 2 protrudes radially outward from the burner cap 11 is the same as the dimension Y by which the flange portion 12 protrudes radially outward from the burner cap 11.

[0038] The burner cover 2 is formed by bending a ring-shaped sheet metal, for example, made of stainless steel. The outer circumference 22 of the burner cover 2 is formed by hemming the outer edge of the ring-shaped sheet metal so that it is folded radially inward.

[0039] More specifically, the outer peripheral portion 22 of the burner cover 2 is a U-shaped portion in vertical cross-section, including an upper portion 221 extending radially outward from the inner peripheral portion 21, a hanging portion 223 extending downward from the radially outward edge of the upper portion 221, and a lower portion 225 extending radially inward from the lower edge of the hanging portion 223. There is a vertical distance between the upper portion 221 and the lower portion 225. In one embodiment of the gas burner 1, the lower surface of the lower portion 225 constitutes the lower surface 1225 of the outer peripheral portion 122 of the flange portion 12.

[0040] The inner cylindrical portion 23 of the burner cover 2 is formed by bending the inner peripheral edge of the raw sheet material, causing it to be folded back 90 degrees and protrude downwards, creating a cylindrical shape.

[0041] The lower surface 228 of the outer peripheral portion 22 of the burner cover 2 (i.e., the lower surface of the lower portion 225 of the outer peripheral portion 22) is located below the upper surface 118 of the burner cap 11.

[0042] As shown in Figure 3, the outer diameter W of the burner cover 2 is set to be larger than the outer diameter X of the burner cap 11. Note that the ignition target portion 116 of the burner cap 11, which will be described later, is not included in the measurement of the outer diameter X of the burner cap 11. The burner cover 2 protrudes radially outward from the burner cap 11 along its entire circumference. In other words, the burner cover 2 protrudes radially outward from the multiple flame holes 115 along its entire circumference.

[0043] The dimension Y by which the burner cover 2 protrudes radially outward from the burner cap 11 is such that the relationship Y ≥ X / 10 is satisfied. Furthermore, the burner cover 2 is provided to protrude radially outward from the burner cap 11 by 4 mm or more.

[0044] As shown in Figures 3 and 4, the vertical thickness T2 of the outer peripheral portion 22 of the burner cover 2 is greater than the vertical thickness T4 of the inner peripheral portion 21 of the burner cover 2. In other words, the outer peripheral portion 22 of the burner cover 2 is formed to be thicker in the vertical direction than the inner peripheral portion 21 of the burner cover 2.

[0045] The vertical thickness T3 of the inner cylindrical portion 23 of the burner cover 2 is greater than the vertical thickness T4 of the inner circumferential portion 21 of the burner cover 2, and also greater than the vertical thickness T2 of the outer circumferential portion 22 of the burner cover 2. In other words, the inner cylindrical portion 23 of the burner cover 2 is formed to be thicker in the vertical direction than the inner circumferential portion 21 and the outer circumferential portion 22 of the burner cover 2.

[0046] (1.2.4) Lower member The lower member 3 is an annular member formed separately from the burner cap 11. In one embodiment of the gas burner 1, the inner circumference 121 of the flange 12 is formed by the inner circumference 21 of the burner cover 2 and the lower member 3 fixed to the lower side of the inner circumference 21. The lower member 3 is fixed to the burner cover 2 by welding.

[0047] As shown in Figures 7 and 8, the outer peripheral edge of the lower member 3 is provided with a plurality of projections 31 that protrude downward. The plurality of projections 31 are six projections 31 arranged in the circumferential direction of the lower member 3. Each of the six projections 31 is formed into a protruding piece shape by bending a part of the original material of the lower member 3.

[0048] The six protrusions 31 are inserted one-to-one into the six recesses 114 provided on the upper surface 118 of the burner cap 11. The lower member 3 is fixed to the burner cap 11 by press-fitting each protrusion 31 into the corresponding recess 114.

[0049] The inner peripheral edge of the lower member 3 is provided with a plurality of protrusions 32 that project radially inward. The plurality of protrusions 32 are three protrusions 32 arranged in the circumferential direction of the lower member 3. The three protrusions 32 are each formed into a crank-shaped projection by bending a part of the original material of the lower member 3. As shown in Figure 8, the lower member 3 is positioned relative to the burner cover 2 by the three protrusions 32 contacting the outer peripheral surface of the inner cylindrical portion 23 of the burner cover 2.

[0050] The vertical thickness T5 of the lower member 3 is approximately the same as the vertical thickness T4 of the inner circumference portion 21 of the burner cover 2. The sum of the vertical thickness T4 of the inner circumference portion 21 of the burner cover 2 and the vertical thickness T5 of the lower member 3 which overlaps it below is the vertical thickness T1 of the inner circumference portion 121 of the flange portion 12.

[0051] (1.2.5) Temperature sensor for the bottom of a pot The pot bottom temperature sensor 13 is configured to detect the temperature by contacting the bottom surface of the cooking container 6 that is heated by the gas burner 1 (see Figure 9A).

[0052] The pot bottom temperature sensor 13 is inserted through the through hole 110 of the burner cap 11 so as to protrude above the burner cap 11. The surface 130 of the pot bottom temperature sensor 13 that is configured to contact the container 6 is located above the burner cap 11 and the burner cover 2. In other words, the surface 130 of the pot bottom temperature sensor 13 is located above the flange portion 12.

[0053] (1.2.6) Burner body As shown in Figures 2 and 3, the burner body 14 includes a burner head 142 having a cylindrical outer shape, a throat portion 146 molded integrally with the burner head 142, and a flange portion 148 molded integrally with the burner head 142 and the throat portion 146.

[0054] The burner head 142 is a cylindrical part having a through hole 143 that runs vertically through its center. A pot bottom temperature sensor 13 is inserted through the through hole 143.

[0055] A burner cap 11 is detachably mounted on the top of the burner head 142. In other words, the top of the burner head 142 constitutes a mounting section 144 for mounting the burner cap 11.

[0056] With the burner cap 11 placed on the burner head 142, the through hole 143 of the burner head 142 and the through hole 110 of the burner cap 11 are in communication with each other. The pot bottom temperature sensor 13 protrudes above the burner cap 11 through the through hole 143 of the burner head 142 and the through hole 110 of the burner cap 11.

[0057] The throat portion 146 is a part that constitutes the mixing tube of the gas burner 1 and protrudes horizontally from the outer circumferential wall of the burner head 142. The throat portion 146 is integrally provided with the outer circumferential wall of the burner head 142. The throat portion 146 has an internal flow path (not shown) that communicates with the internal space of the burner head 142, and an upstream end 147 through which this internal flow path opens.

[0058] The flange portion 148 is a flat plate-shaped portion that extends horizontally from the outer peripheral wall of the throat portion 146. The retaining base 17 is fixed to the flange portion 148.

[0059] The support base 17 has a recess 175 into which the downstream end of the gas supply pipe 18 is fitted. The gas supply pipe 18 is a pipe for supplying gas to the internal flow path of the throat section 146. The support base 17 is fixed to the casing 72 via a mounting fixture (not shown).

[0060] In one embodiment of the cooking appliance 9, fuel gas is supplied to the throat section 146 through the gas supply pipe 18, and ambient air is supplied along with this fuel gas as primary air. The fuel gas and primary air supplied to the throat section 146 are mixed in the internal flow path of the throat section 146 before being supplied to the burner head 142.

[0061] (1.2.7) Spark plug As shown in Figure 5, the spark plug 15 is installed so as to stand upright along the outer surface of the burner head 142. A discharge electrode 151 is provided at the tip of the spark plug 15. The discharge electrode 151 is positioned vertically opposite to the ignition target portion 116 of the burner cap 11. The ignition target portion 116 protrudes radially outward from the outer surface of the burner cap 11.

[0062] In one embodiment of the gas burner 1, the discharge electrode 151 of the spark plug 15 generates a spark with the ignition target section 116. This ignites the gas mixture ejected from each flame hole 115, causing flames to erupt from each flame hole 115. The direction in which the gas mixture is ejected from each flame hole 115 is diagonally upward.

[0063] (1.2.8) Ventilation channels As shown in Figure 4, the ventilation passage 4 is configured to supply secondary air through the flange portion 12 and the burner cap 11 toward the space S1 from which flames are ejected from the multiple flame holes 115. The space S1 into which the secondary air is supplied is located radially outward of the burner cap 11. More specifically, the space S1 into which the secondary air is supplied is radially outward of the outer cylindrical portion 113 of the burner cap 11, and is also located radially outward of the multiple flame holes 115 that are provided to open to the outer circumferential surface of the outer cylindrical portion 113.

[0064] The ventilation passage 4 is a gap that connects the upper end of the through-hole 110 of the burner cap 11 and the space S1 from which the flame is ejected, allowing for radial ventilation inward and outward. The ventilation passage 4 includes an opening 41 that is open radially inward, an opening 42 that is open radially outward, and a main flow path 40 located between the inner and outer openings 41 and 42.

[0065] The inner opening 41 of the ventilation passage 4 is located between the inner cylindrical portion 23 of the burner cover 2 and the upper end of the burner cap 11. The inner opening 41 is formed to form an annular shape in plan view. The inner opening 41 is configured to introduce a portion of the air that has risen through the through hole 110 of the burner cap 11 into the main passage 40 as secondary air.

[0066] The main flow path 40 is formed to allow radial ventilation inward and outward between the lower surface of the lower member 3, which constitutes the lower part of the inner circumference portion 121 of the flange portion 12, and the upper surface 118 of the burner cap 11. As shown in Figure 6, the main flow path 40 is divided into multiple flow paths 401 by a plurality of support portions 119 and a plurality of protrusions 112 (112A, 112B) that are arranged in the circumferential direction. The plurality of flow paths 401 are arranged in the circumferential direction and each is configured to allow radial ventilation inward and outward. Secondary air introduced into the main flow path 40 is rectified in each flow path 401 and discharged radially outward.

[0067] The outer opening 42 of the ventilation passage 4 is located between the upper end of the burner cap 11 and the lower end of the outer peripheral portion 22 of the burner cover 2. The lower end of the outer peripheral portion 22 of the burner cover 2 is located radially outward from the upper end of the burner cap 11 and is also located below the upper end of the burner cap 11.

[0068] The lower end of the outer peripheral portion 22 of the burner cover 2 is, in other words, the lower portion 225 of the outer peripheral portion 22. The outer opening 42 is formed to form an annular shape in plan view. The outer opening 42 is configured to release the secondary air that has passed through the main flow path 40 toward the space S1.

[0069] In the vertical cross-section shown in Figure 4, a distance D1 is provided between the upper surface 118 of the burner cap 11 and the lower surface 228 of the outer peripheral portion 22 of the burner cover 2 (i.e., the lower surface of the lower portion 225). More specifically, distance D1 is the distance between the radially outer edge of the upper surface 118 of the burner cap 11 and the radially inner edge of the lower surface 228 of the outer peripheral portion 22 of the burner cover 2.

[0070] In one embodiment of the gas burner 1, it is preferable that the distance D1 is set within a range of, for example, 0.5 mm to 2.5 mm. In particular, in the case of a high-power gas burner 1, it is preferable that the distance D1 is set within a range of 1.5 mm to 2.5 mm (for example, about 2 mm).

[0071] In one embodiment of the gas burner 1, the ventilation passage 4 is formed between the flange portion 12 and the burner cap 11, so that the heat from the flange portion 12, which becomes hot during use of the gas burner, is suppressed from being transferred to the burner cap 11. In other words, since the ventilation passage 4 is formed between the burner cover 2, which becomes hot, and the burner cap 11 via the lower member 3, the heat from the burner cover 2 is suppressed from being transferred to the burner cap 11, and the temperature rise of the burner cap 11 is suppressed. Therefore, the progression of deterioration that occurs with the temperature rise of the burner cap 11 is effectively suppressed. The progression of deterioration here refers to, for example, the progression of deterioration due to the formation of blisters on the burner cap 11, or the progression of deterioration due to deformation of the burner cap 11.

[0072] In addition, in the gas burner 1 of one embodiment, secondary air is supplied to the space S1 through the ventilation passage 4, which increases the combustion speed of the flame and makes it easier to obtain good combustion. This suppresses flame lift (i.e., the flame moving far away from the flame hole 115).

[0073] In this configuration, the lower surface 1225 of the outer peripheral portion 122 of the flange 12 (i.e., the lower surface 228 of the outer peripheral portion 22 of the burner cover 2) is located below the upper surface 118 of the burner cap 11. Therefore, the secondary air supplied to the space S1 through the outer opening 42 of the ventilation passage 4 is discharged diagonally downward (see Figure 4). This flow of secondary air suppresses the rise of the flame ejected from each flame hole 115, and helps to form a flame that spreads outwards. The secondary air is not supplied immediately next to each flame hole 115, but rather at a position a certain distance radially outward from each flame hole 115. This allows the position where the exothermic reaction occurs to be moved radially outward from each flame hole 115, thereby suppressing the temperature rise of the flange 12 due to the flame, and consequently suppressing the temperature rise of the burner cap 11.

[0074] Furthermore, in one embodiment of the gas burner 1, the lower surface 1225 of the outer peripheral portion 122 of the flange 12 is located below the upper surface 118 of the burner cap 11, so that liquids such as boil-over spills that drip onto the flange 12 can be effectively prevented from entering the interior through the ventilation passage 4.

[0075] (1.2.9) Dimensional relationship between the burner cap and the flange As described above, the outer diameter W of the flange 12 located above the burner cap 11 (i.e., the outer diameter W of the burner cover 2) is set to be larger than the outer diameter X of the burner cap 11. In a high-power gas burner 1, the outer diameter X of the burner cap 11 is 47 mm, and the dimension Y by which the flange 12 protrudes radially outward from the burner cap 11 is 5 mm. In one embodiment of the gas burner 1, Y is set to 5 mm around the entire circumference of the flange 12.

[0076] In one embodiment of the gas burner 1, the flange portion 12 is provided such that the ratio of dimensions X to Y satisfies the relationship Y ≥ X / 10 over its entire circumference. Furthermore, the flange portion 12 is provided so as to protrude 5 mm radially outward from the burner cap 11 (in other words, from the multiple flame holes 115), that is, protrude 4 mm or more.

[0077] In one embodiment of the gas burner 1, the outer diameter of the burner cap 11 is set to 47 mm, which is significantly smaller than the conventional range of 60 mm to 70 mm for high heat output. This improves thermal efficiency and heat distribution.

[0078] In addition, in one embodiment of the gas burner 1, the flange portion 12 is provided to protrude 5 mm radially outward from the burner cap 11. As shown in Figure 9A, even when the gas burner 1 is set to low heat, a distance is maintained between the flames ejected from each flame hole 115 and the pot bottom temperature sensor 13. Therefore, even at low heat, the flame does not easily affect the pot bottom temperature sensor 13, and the effect of accurately detecting the pot bottom temperature with the pot bottom temperature sensor 13 is obtained.

[0079] Furthermore, the influence of the flame on the pot bottom temperature sensor 13 is thought to be due to the flow of high-temperature air (see arrow in Figure 9A) through the through-hole 110 of the burner cap 11, as well as heat radiation from the flame.

[0080] Figure 9B shows Comparative Example 1, in which the gas burner 1 is not provided with a flange portion 12. In this example, when the gas burner 1 is set to low heat, a flame rises near the pot bottom temperature sensor 13. As a result, the burner cap 11 is more likely to experience a temperature rise, and the pot bottom temperature sensor 13 has difficulty accurately detecting the pot bottom temperature.

[0081] Figure 9C shows a comparative example 2, in which the flange portion 12 protrudes radially outward from the burner cap 11 by 2 mm. In this example, when the gas burner 1 is set to low heat, the flame tends to rise near the pot bottom temperature sensor 13. As a result, the burner cap 11 is more likely to experience a temperature rise, and the pot bottom temperature sensor 13 has difficulty accurately detecting the pot bottom temperature. The inventors have shown through experiments that the effect is not sufficiently obtained when the above dimension is set to 2 mm, but the effect is obtained when the above dimension is set to 5 mm.

[0082] (1.3) Low-power gas burner Figures 10 and 11 show a low-power gas burner 1. Like the high-power gas burner 1, the low-power gas burner 1 comprises a cylindrical burner cap 11, an annular flange 12, a pot bottom temperature sensor 13, a burner body 14, and an ignition plug 15. A ventilation passage 4 is formed between the flange 12, which consists of the burner cover 2 and the lower member 3, and the burner cap 11. For components of the low-power gas burner 1 that are the same as those of the high-power gas burner 1, the same reference numerals are used and detailed explanations are omitted.

[0083] The distance D1 (see Figure 4) in the low-power gas burner 1 is preferably set within the range of 0.5 mm to 1.5 mm (for example, about 1 mm).

[0084] In the low-power gas burner 1, the outer diameter X of the burner cap 11 is 40 mm, and the dimension Y by which the flange portion 12 protrudes radially outward from the burner cap 11 is 4.3 mm. In the low-power gas burner 1, as in the high-power gas burner 1, the ratio of dimensions X to Y satisfies the relationship Y ≥ X / 10. Furthermore, in the low-power gas burner 1, the flange portion 12 is provided to protrude radially outward from the burner cap 11 by 4 mm or more.

[0085] In one embodiment of the cooking appliance 9, the low-power gas burner 1 has a heat output of 1100 kcal / h (1.28 kW), and the high-power gas burners 1 on the left and right have a heat output of 3010 kcal / h (3.5 kW). Although not included in one embodiment of the cooking appliance 9, it is also possible to include a medium-power gas burner 1 with a heat output of 2550 kcal / h (2.97 kW). In the medium-power gas burner 1 as well, it is preferable that the distance D1 is set within the range of 0.5 mm to 2.5 mm, and that the dimensional ratio of X to Y satisfies the relationship Y ≥ X / 10, and that the dimension Y by which the flange portion 12 protrudes radially outward from the burner cap 11 is 4 mm or more.

[0086] In any of the high-power, medium-power, or low-power gas burners 1, the outer diameter dimension X of the burner cap 11 is preferably set within the range of 40 mm to 50 mm, and the dimension Y by which the flange portion 12 protrudes radially outward from the burner cap 11 is preferably set within the range of 4 mm to 10 mm. In the case of the high-power gas burner 1, it is also preferable that the dimension Y by which the flange portion 12 protrudes radially outward from the burner cap 11 is set within the range of 5 mm to 10 mm. In the case of the low-power gas burner 1, it is also preferable that the dimension Y by which the flange portion 12 protrudes radially outward from the burner cap 11 is set to 2 mm or more, and also to 10 mm or less.

[0087] (2) Variant Although the present disclosure has been described above based on the embodiments shown in the attached drawings, the present disclosure is not limited to the above embodiments. Any design modifications can be made as appropriate, within the scope intended by the present disclosure.

[0088] For example, in one embodiment of the gas burner 1, the flange portion 12 is composed of a burner cover 2 and a lower member 3, which are separate from the burner cap 11. However, it is also possible to integrate the flange portion 12 and the burner cap 11, or to integrate the burner cover 2 and the lower member 3. In one embodiment of the gas burner 1, the materials of the flange portion 12 and the burner cap 11 are different, but it is also possible to make the flange portion 12 and the burner cap 11 from the same material.

[0089] In one embodiment of the gas burner 1, the flange portion 12 (i.e., the burner cover 2 and the lower member 3) and the burner cap 11 are configured in annular shape, but they may be configured in different shapes, for example, a polygonal shape such as a 12-sided or 24-sided polygon around the entire circumference, or a shape in which a part of the annular shape is replaced by a straight line. The flange portion 12 only needs to protrude radially outward around the entire circumference of the burner cap 11, and the specific external shapes of the flange portion 12 and the burner cap 11 are not interpreted as being limited.

[0090] In one embodiment of the gas burner 1, the distance D1 that serves as the reference for the size of the opening 42 of the ventilation passage 4 is set within the range of 0.5 mm to 2.5 mm, but it is also possible that the distance D1 may be set outside this range.

[0091] In one embodiment, the outer peripheral portion 22 of the burner cover 2 of the gas burner 1 is formed to be thicker than the inner peripheral portion 21 by hemming, but is not limited to this, and for example, the outer peripheral portion 22 may be formed to be thicker than the inner peripheral portion 21 by cutting. Alternatively, the outer peripheral portion 22 may be formed without making it thicker than the inner peripheral portion 21, by curving the outer peripheral portion 122 such that the lower surface 1225 is located below the upper surface 118 of the burner cap 11.

[0092] In one embodiment of the gas burner 1, the burner cap 11 and the flange portion 12 are provided such that the relationship Y≧X / 10 is satisfied, and the flange portion 12 is provided such that it protrudes radially outward from the burner cap 11 by 4 mm or more. However, the invention is not limited to this, and it is possible that the relationship Y≧X / 10 is not satisfied, or that the dimension Y by which the flange portion 12 protrudes radially outward from the burner cap 11 is less than 4 mm.

[0093] In one embodiment, the gas burner 1 is equipped with a pot bottom temperature sensor 13 inserted through a through hole 110 in the burner cap 11, but it is not limited to this, and the gas burner 1 may not be equipped with a pot bottom temperature sensor 13.

[0094] (3) Appearance The gas burner (1) for a stove in the first embodiment comprises a cylindrical burner cap (11), an annular flange (12), and a ventilation passage (4). The burner cap (11) has a through hole (110) that penetrates vertically through its center and a plurality of flame holes (115) on its outer circumference. The flange (12) is provided above the burner cap (11). The ventilation passage (4) is formed between the burner cap (11) and the flange (12) to allow air to circulate radially inward and outward. The outer diameter of the flange (12) is larger than the outer diameter of the burner cap (11). The lower surface (1225) of the outer peripheral portion (122) of the flange (12) that protrudes radially outward from the burner cap (11) is located below the upper surface (118) of the burner cap (11).

[0095] In this embodiment, the formation of a ventilation passage (4) between the flange (12) and the burner cap (11) suppresses the transfer of heat from the flange (12) to the burner cap (11). In addition, the flow of secondary air released diagonally downward through the ventilation passage (4) suppresses the rise of flames ejected from the multiple flame holes (115), thereby suppressing the temperature rise of the flange (12) and, consequently, the burner cap (11).

[0096] Furthermore, this embodiment has the advantage that the flame lift is suppressed by the supply of secondary air, and that liquids such as boil-over spills that have dripped onto the flange (12) are prevented from entering the interior through the ventilation passage (4).

[0097] In the second embodiment of the gas burner (1) for a stove, the ventilation passage (4) has an opening (42) that opens between the upper end of the burner cap (11) and the lower end of the outer peripheral portion (122) of the flange (12). At the opening (42), the distance (D1) between the upper surface (118) of the burner cap (11) and the lower surface (1225) of the outer peripheral portion (122) of the flange (12) is a distance of 0.5 mm or more and 2.5 mm or less.

[0098] According to this embodiment, a sufficient amount of secondary air to effectively suppress flame lift is supplied through the ventilation passage (4). Moreover, it is effectively prevented from liquids such as boil-over spills that have dripped onto the flange (12) entering the interior through the ventilation passage (4).

[0099] A gas burner (1) for a stove in a third embodiment, in the first or second embodiment, includes a flange (12) comprising an outer peripheral portion (122) and an inner peripheral portion (121) which is the portion of the flange (12) radially inward from the outer peripheral portion (122). The outer peripheral portion (122) is formed to be thicker in the vertical direction than the inner peripheral portion (121).

[0100] In the fourth embodiment, the gas burner (1) for a stove is formed by hemming the outer circumference (122) in any one of the first to third embodiments, with the outer circumference (122) folded inward in the radial direction.

[0101] According to this embodiment, by hemming the raw plate material, a flange portion (12) having a thick and high-strength outer peripheral portion (122) can be obtained.

[0102] A fifth embodiment of the stovetop gas burner (1) further comprises a pot bottom temperature sensor (13) inserted through a through hole (110) in the burner cap (11) in any one of the first to fourth embodiments. When the outer diameter of the burner cap (11) is X, and the dimension of the flange portion (12) that protrudes radially outward from the burner cap (11) is Y, the burner cap (11) and the flange portion (12) are provided such that Y ≥ X / 10.

[0103] According to this embodiment, it is possible to achieve both improved thermal efficiency and heat distribution during cooking by setting a small outer diameter of the burner cap (11), and accurate detection of the pot bottom temperature by the pot bottom temperature sensor (13) even when the heat is set to low.

[0104] The sixth embodiment of the stovetop gas burner (1) further comprises a pot bottom temperature sensor (13) inserted through a through hole (110) of the burner cap (11) in any one of the first to fifth embodiments. The flange (12) is provided to protrude radially outward from the burner cap (11) by 4 mm or more.

[0105] According to this embodiment, it is possible to achieve both improved thermal efficiency and heat distribution during cooking by setting a small outer diameter of the burner cap (11), and accurate detection of the pot bottom temperature by the pot bottom temperature sensor (13) even when the heat is set to low.

[0106] The seventh embodiment of the cooking appliance (9) comprises a gas burner (1) for a stove according to any one of the first to sixth embodiments, and a cooking appliance body (7) to which the gas burner (1) is attached.

[0107] According to this embodiment, the temperature rise of the burner cap (11) of the gas burner (1) of the cooking appliance (9) is suppressed. In addition, there are advantages such as suppressing the lifting of the flame of the gas burner (1) and preventing liquids such as boil-overs from entering the inside of the gas burner (1). [Explanation of Symbols]

[0108] 1. Gas burner for stove 11 Burner Cap 110 Through hole 115 Flame hole 118 Top surface 12 Guard section 121 Inner circumference 122 Outer area 1225 Bottom surface 13. Pot bottom temperature sensor 4. Ventilation channel 42 Opening 7 Cooking appliance body 9 Cooker D1 Distance

Claims

1. A cylindrical burner cap having a through hole in the center that penetrates vertically and multiple flame holes on its outer circumference, An annular flange portion provided above the burner cap, The burner cap and the flange portion are provided with a ventilation passage formed to allow air to circulate radially inward and outward, The outer diameter of the flange is larger than the outer diameter of the burner cap. The lower surface of the outer peripheral portion of the flange that protrudes radially outward from the burner cap is located below the upper surface of the burner cap. Gas burner for stovetop.

2. The ventilation passage has an opening that opens between the upper end of the burner cap and the lower end of the outer peripheral portion of the flange, In the aforementioned opening, the distance between the upper surface of the burner cap and the lower surface of the outer peripheral portion of the flange is 0.5 mm or more and 2.5 mm or less. A gas burner for a stove according to claim 1.

3. The flange portion includes the outer peripheral portion and the inner peripheral portion which is the portion of the flange portion radially inward from the outer peripheral portion. The outer circumferential portion is formed to be thicker in the vertical direction than the inner circumferential portion. A gas burner for a stove according to claim 1 or 2.

4. The aforementioned outer circumference is formed by hemming, which folds the outer portion inward in the radial direction. A gas burner for a stove according to claim 3.

5. The burner cap further comprises a pot bottom temperature sensor inserted through the through hole, Let X be the outer diameter of the burner cap, and Y be the dimension of the flange portion that protrudes radially outward from the burner cap. The burner cap and the flange portion are provided such that Y ≥ X / 10. A gas burner for a stove according to claim 1.

6. The burner cap further comprises a pot bottom temperature sensor inserted through the through hole, The flange portion is provided so as to protrude radially outward from the burner cap by 4 mm or more. A gas burner for a stove according to claim 1.

7. A gas burner for a stove according to claim 1, A cooking appliance comprising a cooking appliance body equipped with the aforementioned gas burner for a stove, Heating cooker.

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