Stove burners and gas stoves

Abstract

The present invention provides a stove burner and a gas stove, wherein the stove burner includes a burner cover (3) placed on a burner body (2), wherein a plurality of flame port grooves (32) are formed on an annular wall (31) provided on the outer peripheral portion of the lower surface of the burner cover (3) at circumferential intervals. The plurality of flame port grooves (32) are recessed upward from the lower end of the annular wall (31) to form flame ports (4). This increases the flow rate distribution of the mixed gas at the flame port (4) at the upper portion of the flame port. The inner peripheral surface of the annular wall (31) is formed into a tapered shape that decreases in diameter toward the upper portion. In addition, the circumferential width of the flame port groove (32) increases toward the radial inner side of the annular wall (31). Furthermore, the shape of the inlet portion (32a) of the flame port groove (32) opening on the inner peripheral surface of the annular wall (31) when viewed from the radial inner side of the annular wall (31) is formed into a trapezoidal shape with a larger upper base than a lower base.

Description

Technical Field

[0001] The present invention relates to a stove burner and a gas stove. The stove burner comprises a burner body to which mixed gas is supplied, and a burner cover placed on the burner body and having flame ports opened on an outer peripheral surface. Background Art

[0002] In the past, the following structure is known as a burner for a stove of this type: an annular wall is provided downwardly on the outer periphery of the lower surface of the burner cover, and a plurality of flame port grooves are formed on the annular wall at circumferential intervals, which are recessed upward from the lower end of the annular wall to form flame ports (for example, see patent document 1).

[0003] A stove burner is also known that includes a burner cover having upper and lower flame ports opening on its outer circumference. The burner cover includes an annular lower cover member and an annular upper cover member. The lower flame ports are defined between the burner body and the lower cover member, and the upper flame ports are defined between the lower cover member and the upper cover member. It is also known that: regarding this type of burner for a stove, a first annular wall is erected on the outer peripheral portion of the upper surface of the lower cover component, and a second annular wall is drooped on the outer peripheral portion of the lower surface of the upper cover component and falls on the first annular wall, the upper flame port is divided into two upper and lower parts of an upper flame port part and a lower flame port part, a plurality of first flame port grooves that are recessed downward from the upper end of the first annular wall to form the lower flame port part are formed on the first annular wall in a manner with circumferential intervals, and a plurality of second flame port grooves that are recessed upward from the lower end of the second annular wall to form the upper flame port part are formed on the second annular wall in a manner with circumferential intervals and circumferentially offset relative to the first flame port grooves (for example, see patent document 2).

[0004] In addition, when a flame port groove is formed that is recessed upward from the lower end of the annular wall as described above, the shape of the flame port groove observed from the radial inner side of the annular wall is a trapezoid with a demolding gradient for demolding the forming mold of the flame port groove downward, that is, a trapezoid with a lower base slightly larger than the upper base.

[0005] To improve the heating efficiency of the object being heated, i.e., the cooking vessel, located above the stove burner, it is desirable to increase the flow distribution of the mixed gas at the flame port toward the upper portion of the flame port, thereby increasing the heat generated by the flame formed by the combustion of the mixed gas ejected from the flame port at the upper portion. However, the conventional stove burner described above cannot achieve this goal because the flame port groove includes a mold release gradient for downward release of the mold.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2014-214963

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2019-143959 Summary of the Invention

[0010] In view of the above problems, an object of the present invention is to provide a stove burner capable of increasing the flow distribution of mixed gas at the flame port above the flame port, and a gas stove equipped with the stove burner.

[0011] In order to solve the above-mentioned problems, the first invention of the present application is a burner for a stove, which comprises: a burner body, to which a mixed gas is supplied; and a burner cover, which is placed on the burner body and has a flame port opening on the outer peripheral surface. The burner for the stove is characterized in that an annular wall is provided downwardly on the outer peripheral portion of the lower surface of the burner cover, and a plurality of flame port grooves are formed on the annular wall at circumferential intervals, which are recessed upward from the lower end of the annular wall to form flame ports. The inner peripheral surface of the annular wall is formed into a cone that decreases in diameter toward the upper side, and the circumferential width of each flame port groove gradually increases toward the radial inner side of the annular wall. When the inlet portion of each flame port groove opening on the inner peripheral surface of the annular wall is observed from the radial inner side of the annular wall, the shape obtained is a trapezoid with a larger upper base than a lower base.

[0012] The second invention of the present application is a burner for a stove, which comprises: a burner body to which a mixed gas is supplied; and a burner cover, which is placed on the burner body and has two layers of flame ports, upper and lower, which are open on the outer peripheral surface. The burner cover is constructed to include an annular lower cover component and an annular upper cover component, a lower flame port is formed between the burner body and the lower cover component, and an upper flame port is formed between the lower cover component and the upper cover component. The burner for the stove is characterized in that a first annular wall is erected on the outer peripheral portion of the upper surface of the lower cover component, and a second annular wall is drooped on the outer peripheral portion of the lower surface of the upper cover component and falls on the first annular wall, and the upper flame port is divided into an upper flame port and an upper flame port. The flame mouth part and the upper and lower parts of the lower flame mouth part are provided with a plurality of first flame mouth grooves recessed downward from the upper end of the first annular wall at circumferential intervals, forming the lower flame mouth part; the second annular wall is provided with a plurality of second flame mouth grooves recessed upward from the lower end of the second annular wall at circumferential intervals and circumferentially offset relative to the first flame mouth grooves, forming the upper flame mouth part; the inner circumferential surface of the second annular wall is formed into a cone that decreases in diameter toward the upper side, and the circumferential width of each second flame mouth groove gradually increases toward the radial inner side of the second annular wall, and the shape of the entrance of each second flame mouth groove opening on the inner circumferential surface of the second annular wall observed from the radial inner side of the second annular wall is a trapezoid with a larger upper base than a lower base.

[0013] Furthermore, a third invention of the present application is a gas stove characterized by being equipped with the stove burner of the first invention or the stove burner of the second invention.

[0014] According to the present invention (the first and second inventions), the width of the upper portion of the inlet of the flame port groove (the second flame port groove in the second invention) is greater than the width of the lower portion, allowing the mixed gas to flow more easily toward the upper portion of the inlet. As a result, the flow distribution of the mixed gas at the flame port (the upper portion of the flame port in the second invention) increases toward the upper portion of the flame port. Consequently, the flame generated by the combustion of the mixed gas ejected from the flame port (the upper portion of the flame port in the second invention) generates more heat at the upper portion, improving the heating efficiency of the cooking container.

[0015] In addition, the inner circumferential surface of the annular wall (the second annular wall in the second invention) is formed into a cone that decreases in diameter toward the upper side, and the circumferential width of each flame mouth groove (the second flame mouth groove in the second invention) is gradually increased toward the radial inner side of the annular wall (the second annular wall in the second invention). Thus, even if the flame mouth groove (the second flame mouth groove in the second invention) has a demolding gradient for demolding its forming mold downward, the shape of the entrance portion of the flame mouth groove (the second flame mouth groove in the second invention) observed from the radial inner side of the annular wall (the second annular wall in the second invention) can be formed into a trapezoid with an upper base larger than a lower base. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view of the main part of the gas stove equipped with the stove burner according to the first embodiment of the present invention.

[0017] Figure 2 Therefore Figure 1 Cross-sectional view taken along line II-II.

[0018] Figure 3 It is a perspective view of the stove burner according to the first embodiment.

[0019] Figure 4 (a) is an enlarged cutaway side view of a main portion of the stove burner according to the first embodiment. Figure 4 (b) Figure 4 (a) is a cross-sectional view taken along line IVb-IVb. Figure 4 (c) Figure 4 Cross-sectional view taken along line IVc-IVc in (a).

[0020] Figure 5 A gas stove equipped with a stove burner according to a second embodiment of the present invention. Figure 2 Corresponding cross-sectional view.

[0021] Figure 6 (a) is an enlarged cutaway side view of a main portion of a stove burner according to a second embodiment. Figure 6 (b) Figure 6 (a) is a cross-sectional view taken along line VIb-VIb. Figure 6 (c) Figure 6 Cross-sectional view taken along line VIc-VIc in (a).

[0022] Description of Reference Numerals

[0023] 1…burner for stove, 2…burner body, 3…burner cover, 3L…lower cover part, 3U…upper cover part, 31…annular wall, 311…first annular wall, 312…second annular wall, 32…flame port groove, 32a…entrance of flame port groove, 321…first flame port groove, 322…second flame port groove, 322a…entrance of second flame port groove, 4…flame port, 4L…lower flame port, 4U…upper flame port, 4Ua…upper flame port portion, 4Ub…lower flame port portion. DETAILED DESCRIPTION

[0024] Reference Figure 1 、 Figure 2 TP represents a top plate covering the upper surface of a stove body (not shown) of a gas stove. The gas stove is equipped with a stove burner 1 facing a burner opening TPa formed in the top plate TP. The burner 1 heats a cooking vessel such as a pot placed on a hob G on the top plate TP.

[0025] Refer again Figure 3 A stove burner 1 includes a burner body 2, to which a mixed gas is supplied, the upper portion of which protrudes above the top plate TP through a burner opening TPa in the top plate TP; and a burner cover 3, which is placed on the burner body 2. Multiple flame ports 4U and 4L are provided on the outer circumferential surface of the burner cover 3 at circumferential intervals, arranged in two layers. Furthermore, at multiple locations on the circumference of the burner cover 3, located in the same orientation as the multiple grate claws Ga of the grate G, only the lower layer of flame ports 4L are formed, without the upper layer of flame ports 4U, to prevent incomplete combustion caused by the flame contacting the grate claws Ga.

[0026] Describing in more detail, the burner body 2 comprises a triple inner and outer cylindrical body: an outer cylindrical body 21, an inner cylindrical body 22, and a middle cylindrical body 23. The burner cover 3 comprises an annular lower cover member 3L, with a cylindrical portion 3La provided downwardly from its inner periphery to engage with the middle cylindrical body 23 of the burner body 2; and an annular upper cover member 3U, with a cylindrical portion 3Ua provided downwardly from its inner periphery to engage with the inner cylindrical body 22 of the burner body 2. Furthermore, a lower flame port 4L is defined between the outer cylindrical body 21 of the burner body 2 and the lower cover member 3L, while an upper flame port 4U is defined between the lower cover member 3L and the upper cover member 3U.

[0027] The upper flame port 4U is divided into two parts: an upper flame port portion 4Ua and a lower flame port portion 4Ub. Specifically, a first annular wall 311 is erected on the outer periphery of the upper surface of the lower cover member 3L, and a second annular wall 312 is provided on the outer periphery of the lower surface of the upper cover member 3U, resting on the first annular wall 311. Furthermore, a plurality of first flame port grooves 321 are formed circumferentially spaced apart in the first annular wall 311, recessed downward from the upper end of the first annular wall 311 and forming the lower flame port portion 4Ub of the upper flame port 4U. Furthermore, a plurality of second flame port grooves 322 are formed circumferentially spaced apart in the second annular wall 312, recessed upward from the lower end of the second annular wall 312 and forming the upper flame port portion 4Ua of the upper flame port 4U. As a result, the upper flame port portion 4Ua and the lower flame port portion 4Ub are offset in the circumferential direction and are arranged in a staggered manner.

[0028] A third annular wall 313 is provided downwardly from the outer periphery of the lower surface of the lower cover member 3L, and is positioned to rest on the upper end of the outer cylinder 21 of the burner body 2. A plurality of grooves, recessed upward from the lower end of the third annular wall 313 and forming the lower flame ports 4L, are formed in the third annular wall 313 at circumferential intervals.

[0029] In addition, the stove burner 1 is provided with an ignition electrode 11 and a thermocouple 12 as a flame monitoring element. A target portion 33 (see FIG. 1 ) is provided at one position in the circumferential direction of the lower cover member 3L. Figure 3 ). And, the lower flame port 4L is ignited by spark discharge between the ignition electrode 11 and the target portion 33. In addition, a flange portion 34 is protrudingly provided on the upper cover member 3U at a position in the circumferential direction that is consistent with the position of the ignition electrode 11 to prevent boil-over from falling toward the ignition electrode 11. In addition, a cover 13 is inserted outside the burner body 2 to cover the burner opening TPa from above to prevent boil-over from falling through the gap between the burner opening TPa and the stove burner 1.

[0030] The stove burner 1 also includes a first mixing tube 5U for the upper flame port 4U, which communicates with the space between the inner cylinder 22 and the intermediate cylinder 23 of the burner body 2; and a second mixing tube 5L for the lower flame port 4L, which communicates with the space between the outer cylinder 21 and the intermediate cylinder 23 of the burner body 2. Fuel gas is supplied to the first mixing tube 5U via a first branch line 6U branching from the common gas supply line 6. Fuel gas is supplied to the second mixing tube 5L via a second branch line 6L branching from the gas supply line 6. Within the first and second mixing tubes 5U, the fuel gas mixes with primary air drawn into each mixing tube 5U, 5L. The mixed gas from the first mixing tube 5U passes through the space between the inner cylinder 22 and the intermediate cylinder 23 of the burner body 2 and the space between the lower cover member 3L and the upper cover member 3U, and is ejected from the upper flame port 4U. Furthermore, the mixed gas from the second mixing pipe 5L passes through the space between the outer tube 21 and the intermediate tube 23 of the burner body 2 and the space between the outer tube 21 and the lower cover member 3L, and is ejected from the lower flame port 4L.

[0031] The gas supply path 6 is provided with: an electromagnetic safety valve 61, which is forced to open during ignition and is closed when a fire is detected due to a decrease in the electromotive force of the thermocouple 12; and a source valve 62, which is opened during ignition and closed during flameout. In addition, a first flow regulating valve 63U and a second flow regulating valve 63L are provided in the first branch 6U and the second branch 6L, respectively, which are linked to an operating component including a lever and a knob for adjusting the fire power (not shown) so that the opening changes. The operating component can be operated from a weak fire position to a strong fire position. If the operating component is operated from a weak fire position to a strong fire position, the opening of the second flow regulating valve 63L gradually increases from the minimum opening. On the other hand, the first flow regulating valve 63U does not open until the operating component reaches a specified intermediate position. When it just exceeds the intermediate position, it suddenly opens to a specified opening, and the opening gradually increases by the subsequent operation to the strong fire position. Furthermore, when the operating member is operated from the low-fire position to the intermediate position, the mixed gas is supplied to the upper flame port 4U, so that the flame moves from the lower flame port 4L to the upper flame port 4U.

[0032] Here, in this embodiment, if Figure 4 As shown in (a), the inner peripheral surface of the second annular wall 312 is formed into a tapered shape that decreases in diameter toward the upper side. Figure 4 As shown in (b), the circumferential width of each second flame opening groove 322 gradually increases as it approaches the radial inner side of the second annular wall 312. Specifically, the taper angle θa of the inner circumferential surface of the second annular wall 312 is set to, for example, 40°, and the widening angle θb of the circumferential width of each second flame opening groove 322 of the second annular wall 312 toward the radial inner side is set to, for example, 10°. Figure 4As shown in (c), the shape of the entrance portion 322a of each second flame opening groove 322 opened on the inner circumferential surface of the second annular wall 312 when viewed from the radial inner side of the second annular wall 312 is a trapezoidal shape with a larger upper base than the lower base. Figure 4 In (c), for easier understanding, the inlet portion 322a of the second flame opening groove 322 is marked with grid lines.

[0033] As a result, the width of the upper portion of the inlet portion 322a of the second flame opening groove 322 is greater than the width of the lower portion. This allows the mixed gas to flow more easily into the upper portion of the inlet portion 322a. As a result, the flow distribution of the mixed gas at the upper flame opening portion 4Ua increases toward the upper portion. Consequently, the flame generated by the combustion of the mixed gas ejected from the upper flame opening portion 4Ua generates more heat at the upper portion, improving the heating efficiency of the cooking container.

[0034] However, the second flame opening grooves 322 have a draft gradient of approximately 1° that widens downward, allowing downward release from the mold. However, by forming the aforementioned tapered shape on the inner circumferential surface of the second annular wall 312 and increasing the circumferential width of each second flame opening groove 322 radially inward, even with the aforementioned draft gradient, the entrance portion 322a of the second flame opening groove 322, when viewed from the radially inward side, can be formed into a trapezoidal shape with a larger upper base than the lower base.

[0035] Furthermore, in this embodiment, the upper bottom surface of the second flame opening groove 322 is tilted upward, radially outward. This is to facilitate the upward rise of the flames from the upper flame opening portion 4Ua, thereby improving the heating efficiency of the cooking container. However, the upper bottom surface of the second flame opening groove 322 is not necessarily tilted in this manner.

[0036] In the above, the stove burner 1 is described in which the outer peripheral surface of the burner cover 3 is provided with two layers of flame ports 4U and 4L. However, the present invention can also be applied to a stove burner in which the outer peripheral surface of the burner cover is provided with flame ports in a single layer. Figure 5 Such a stove burner will be described.

[0037] Figure 5The stove burner 1 of the second embodiment shown includes: a burner body 2, to which a mixed gas is supplied, the upper portion of which protrudes from the top plate TP through the burner opening TPa in the top plate TP; and a burner cover 3, which is placed on the burner body 2. The burner body 2 has a double inner and outer cylindrical body, an outer cylindrical body 21 and an inner cylindrical body 22. The burner cover 3 is annular, and a cylindrical portion 3a is provided downwardly from the inner circumference thereof, which engages with the inner cylindrical body 22 of the burner body 2. An annular wall 31 is provided downwardly from the outer circumference of the lower surface of the burner cover 3, which rests on the upper end of the outer cylindrical body 21 of the burner body 2. A plurality of flame port grooves 32, which serve as flame ports 4 and are recessed upward from the lower end of the annular wall 31, are formed in the annular wall 31 at intervals in the circumferential direction.

[0038] Here, if Figure 6 As shown in (a), the inner peripheral surface of the annular wall 31 is formed into a tapered shape that decreases in diameter toward the upper side. Figure 6 As shown in (b), the circumferential width of each flame opening groove 32 gradually increases toward the radial inner side of the annular wall 31. The taper angle θa of the inner circumferential surface of the annular wall 31 is set to, for example, 40°, similarly to the stove burner 1 of the first embodiment described above. The widening angle θb of the circumferential width of each flame opening groove 32 of the annular wall 31 toward the radial inner side is also set to, for example, 10°, similarly to the stove burner 1 of the first embodiment described above. Figure 6 As shown in FIG. 5( c ), the shape of the inlet portion 32 a of each flame port groove 32 opened on the inner peripheral surface of the annular wall 31 when viewed from the radial inner side of the annular wall 31 is a trapezoid with a larger upper base than a lower base.

[0039] Thus, similar to the stove burner 1 of the first embodiment described above, the mixed gas easily flows into the upper portion of the inlet portion 32a of the flame port groove 32. As a result, the flow distribution of the mixed gas at the flame port 4 increases toward the upper portion. Therefore, the heat generated by the flame formed by the combustion of the mixed gas ejected from the flame port 4 increases in the upper portion, thereby improving the heating efficiency of the cooking container. In addition, by forming the inner circumferential surface of the annular wall 31 into the above-mentioned tapered shape and increasing the circumferential width of each flame port groove 32 radially inward, even if the flame port groove 32 has a demolding gradient for demolding the mold downward, the shape of the inlet portion 32a of the flame port groove 32, as viewed from the radial inside, can be formed into a trapezoidal shape with a larger upper base than the lower base.

[0040] While the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited thereto. For example, in the first embodiment, the mixed gas is supplied from the first mixing tube 5U and the second mixing tube 5L to the upper burner port 4U and the lower burner port 4L, respectively. However, the mixed gas may be supplied from a common mixing tube to the upper burner port 4U and the lower burner port 4L.

Claims

1. A stove burner comprising: a burner body to which a mixed gas is supplied; and a burner cover placed on the burner body and having a flame port opened on an outer peripheral surface. The burner for the stove is characterized in that: An annular wall is provided downwardly on the outer periphery of the lower surface of the burner cover, and a plurality of flame port grooves are formed on the annular wall at circumferential intervals. The grooves are recessed upward from the lower end of the annular wall to form flame ports. The inner circumferential surface of the annular wall is formed into a cone with a diameter that decreases upward, and the circumferential width of each flame port groove gradually increases toward the radial inner side of the annular wall. When observed from the radial inner side of the annular wall, the entrance of each flame port groove opening on the inner circumferential surface of the annular wall is a trapezoid with an upper base larger than a lower base.

2. A stove burner comprising: a burner body to which a mixed gas is supplied; and a burner cover, the burner cover being placed on the burner body and having upper and lower flame ports opened on an outer peripheral surface, the burner cover being constructed to include an annular lower cover member and an annular upper cover member, the lower flame port being defined between the burner body and the lower cover member, and the upper flame port being defined between the lower cover member and the upper cover member. The burner for the stove is characterized in that: A first annular wall is erected on the outer periphery of the upper surface of the lower cover member, and a second annular wall is suspended from the outer periphery of the lower surface of the upper cover member and is located on the first annular wall. The upper flame port is divided into two parts, an upper flame port part and a lower flame port part. A plurality of first flame port grooves are formed on the first annular wall at circumferential intervals, which are recessed downward from the upper end of the first annular wall to form the lower flame port part. A plurality of second flame port grooves are formed on the second annular wall at circumferential intervals and are offset in the circumferential direction relative to the first flame port grooves to form the upper flame port part. The inner circumferential surface of the second annular wall is formed into a cone with a diameter that decreases upward, and the circumferential width of each second flame mouth groove gradually increases toward the radial inner side of the second annular wall. When observing the entrance of each second flame mouth groove opening on the inner circumferential surface of the second annular wall from the radial inner side of the second annular wall, the shape obtained is a trapezoid with an upper base larger than a lower base.

3. A gas stove, characterized in that: The stove burner according to claim 1 or 2 is mounted thereon.

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