TWI858214B - Gas stove core and gas stove - Google Patents

Abstract

A gas furnace core is provided so that the flow rate of the mixed gas at the flame port (4) can be distributed at the upper part of the flame port and become larger. The gas furnace core comprises a core cap (3) mounted on a core body (2), and a plurality of flame port grooves (32) are formed at intervals in the circumferential direction at an annular wall (31) provided downwardly at the outer peripheral part of the lower surface of the core cap (3) and formed at intervals in the circumferential direction to form the flame port (4).

A tapered surface that decreases in diameter upward is added to the inner circumferential surface of the annular wall (31). Also, the circumferential width of the flame opening groove (32) is expanded as it moves toward the inner side of the diameter direction of the annular wall (31). Also, the shape of the entrance portion (32a) of the flame opening groove (32) opened at the inner circumferential surface of the annular wall (31) observed from the inner side of the diameter direction of the annular wall (31) is constructed to be a trapezoid with a larger upper base than a lower base.

Description

Gas stove core and gas stove

The present invention relates to a gas furnace core and a gas furnace. The gas furnace core comprises: a core body supplied with mixed gas; and a core cap placed on the core body and having a flame port opened at the outer peripheral surface.

In the prior art, the core of this type of gas furnace is known to have the following structure: that is, an annular wall is suspended from the outer peripheral portion of the lower side of the core cap, and on this annular wall, a plurality of flame opening grooves, which are recessed upward from the lower end of the annular wall and serve as flame openings, are formed at intervals in the circumferential direction (for example, refer to Patent Document 1).

In addition, as a gas furnace core, it is known that the following general structure is provided: that is, it is provided with a core cap having two upper and lower flame ports opened at the outer peripheral surface. In such a gas furnace core, the core cap is generally composed of an annular lower cap member and an annular upper cap member, and the lower flame port is divided between the core body and the lower cap member, and the upper flame port is divided between the lower cap member and the upper cap member. In the furnace core of such a gas stove, the following general structure is known: that is, a first annular wall is vertically provided at the upper peripheral portion of the lower cap member, and a second annular wall is vertically provided at the lower peripheral portion of the upper cap member and is seated on the first annular wall, so that the upper flame port is divided into two upper and lower parts of the upper flame port part and the lower flame port part, and a second annular wall is provided at the first annular wall from the upper end of the first annular wall to form a second annular wall. The first flame mouth groove, which is recessed downward and becomes the lower flame mouth part, is formed in multiple numbers with intervals in the circumferential direction. At the second annular wall, the second flame mouth groove, which is recessed upward from the lower end of the second annular wall and becomes the upper flame mouth part, is formed in multiple numbers with intervals in the circumferential direction and is offset in the circumferential direction relative to the first flame mouth groove (for example, refer to patent document 2).

In addition, when a flame groove is formed that is recessed upward from the lower end of the annular wall as described above, the shape of the flame groove observed from the inner side of the diameter direction of the annular wall becomes a trapezoid with an extraction gradient added for extracting the forming mold of the flame groove downward, that is, it becomes a trapezoid with a lower base that is slightly larger than the upper base.

Here, in order to improve the heating efficiency of the conditioning container as the heated object located above the gas furnace core, it is ideal to set the flow distribution of the mixed gas at the flame port to be greater at the upper part of the flame port, and increase the heat generation at the upper part of the flame formed by the combustion of the mixed gas ejected from the flame port. However, in the gas furnace core of the above-mentioned prior art example, since a pull-out gradient for pulling the forming mold downward is added to the flame port groove, it is impossible to respond to this requirement. [Prior art literature] [Patent literature]

[Patent Document 1] Japanese Patent Publication No. 2014-214963 [Patent Document 2] Japanese Patent Publication No. 2019-143959

[The problem the invention is trying to solve]

The present invention is made in view of the above-mentioned problem, and aims to provide a gas furnace core capable of distributing the flow rate of the mixed gas at the flame mouth to increase at the upper part of the flame mouth, and a gas furnace equipped with the gas furnace core. [Means for solving the problem]

In order to solve the above-mentioned problems, the first invention of this case is a gas furnace core, which comprises: a core body, which is supplied with mixed gas; and a core cap, which is placed on the core body and has a flame port opened at the outer peripheral surface, and an annular wall is provided downwardly at the outer peripheral portion of the lower side of the core cap, and a flame port groove which is formed by the flame port and is concave upward from the lower end of the annular wall exists in the circumferential direction. The gas furnace core is formed in plural at intervals, and its characteristics are as follows: a tapered surface that decreases in diameter upward is added to the inner peripheral surface of the annular wall, and each flame opening groove is made to gradually expand in the circumferential direction toward the inner side of the radial direction of the annular wall. The shape of the entrance of each flame opening groove opened at the inner peripheral surface of the annular wall observed from the inner side of the radial direction of the annular wall is a trapezoid with an upper base larger than the lower base.

Furthermore, the second invention of the present case is a gas furnace core, which comprises: a core body, which is supplied with a mixed gas; and a core cap, which is placed on the core body and has two upper and lower flame ports opened at the outer peripheral surface, the core cap being composed of an annular lower cap member and an annular upper cap member, a lower flame port being divided between the core body and the lower cap member, and a lower flame port being divided between the lower cap member and the upper cap member. The upper flame port is divided between the components, and a first annular wall is vertically arranged at the upper peripheral portion of the lower cap component, and a second annular wall is suspended and seated on the first annular wall at the lower peripheral portion of the upper cap component. The upper flame port is divided into two upper and lower parts, an upper flame port part and a lower flame port part. At the first annular wall, a flame port is formed from the upper end of the first annular wall and faces downward. The first flame opening grooves, which are concave and become the lower flame opening part, are formed in plurality at intervals in the circumferential direction. At the second annular wall, the second flame opening grooves, which are concave upward from the lower end of the second annular wall and become the upper flame opening part, are formed in plurality at intervals in the circumferential direction and are offset in the circumferential direction relative to the first flame opening grooves. The gas furnace core is characterized in that The characteristics are as follows: a tapered surface which decreases in diameter upward is added to the inner circumferential surface of the second annular wall, and each second flame opening groove has a circumferential width which gradually expands toward the radial inner side of the second annular wall. The shape of the entrance of each second flame opening groove which opens at the inner circumferential surface of the second annular wall as observed from the radial inner side of the second annular wall is a trapezoid whose upper base is larger than the lower base.

Furthermore, the third invention of this case is a gas stove, which is characterized in that it is equipped with the gas stove core of the first invention or the gas stove core of the second invention.

According to the present invention (the first and second inventions), the width of the upper portion of the inlet of the flame opening groove (the second flame opening groove in the second invention) is wider than the width of the lower portion, so the mixed gas is easy to flow into the upper portion of the inlet. As a result, the flow distribution of the mixed gas at the flame opening (the upper flame opening portion in the second invention) is increased at the upper portion of the flame opening. Therefore, the heat generation at the upper portion of the flame formed by the combustion of the mixed gas ejected from the flame opening (the upper flame opening portion in the second invention) is increased, and the heating efficiency of the conditioning container is improved.

In addition, by adding a tapered surface that decreases in diameter upward to the inner circumferential surface of the annular wall (the second annular wall in the second invention), and gradually expanding the circumferential width of each flame opening groove (the second flame opening groove in the second invention) toward the inner side of the diameter direction of the annular wall (the second annular wall in the second invention), even if the flame opening groove (In the second invention, it is the second flame groove) and an extraction gradient is added to extract the forming mold downward, and the shape of the entrance of the flame groove (in the second invention, it is the second flame groove) observed from the radial inner side of the annular wall (in the second invention, it is the second annular wall) can be set to a trapezoid with a larger upper bottom than the lower bottom.

Referring to Fig. 1 and Fig. 2, TP is a top plate covering the upper surface of the gas stove body (not shown). In the gas stove, a gas stove core 1 is placed facing a furnace core opening TPa opened at the top plate TP, and heats a cooking container such as a pot placed at a furnace rack G on the top plate TP.

Referring also to FIG. 3 , the gas furnace core 1 comprises: a core body 2 supplied with mixed gas, and having its upper portion protruding from the top plate TP through the core opening TPa of the top plate TP; and a core cap 3 placed on the core body 2. On the outer peripheral surface of the core cap 3, the upper and lower flame ports 4U and 4L are opened in a plurality of places with intervals in the circumferential direction. In addition, at the portions of the core cap 3 in the circumferential direction at the same position as the plurality of rack claws Ga of the rack G, in order to prevent the flame from touching the rack claws Ga and causing incomplete combustion, the upper flame port 4U is not formed, but only the lower flame port 4L is formed.

To explain in more detail, the core body 2 has three layers of inner and outer cylinders, namely, an outer cylinder 21 as an outer cylinder, an inner cylinder 22 as an inner cylinder, and an intermediate cylinder 23 as an intermediate cylinder. The core cap 3 is composed of a "lower annular cap member 3L suspended from a cylinder portion 3La fitted with the intermediate cylinder 23 of the core body 2 at the inner periphery" and a "upper annular cap member 3U suspended from a cylinder portion 3Ua fitted with the inner cylinder 22 of the core body 2 at the inner periphery". In addition, between the outer cylinder 21 of the core body 2 and the lower cap member 3L, a lower flame port 4L is defined, and between the lower cap member 3L and the upper cap member 3U, an upper flame port 4U is defined.

The upper flame port 4U is divided into two upper and lower parts, an upper flame port part 4Ua and a lower flame port part 4Ub. Specifically, a first annular wall 31 ₁ is vertically provided at the upper peripheral part of the lower cap member 3L, and a second annular wall 31 2 is suspended and seated on the first annular wall 31 ₁ at the lower peripheral part of the upper cap member 3U. In addition, a plurality of first flame port grooves 32 ₁ are formed at intervals in the circumferential direction at the first annular wall 31 ₁ , which are recessed downward from the upper end of the first annular wall _{31 1} and become the lower flame port part 4Ub of the upper flame port 4U. Furthermore, at the second annular wall ₃₁₂ , the second flame opening grooves ₃₂₂ , which are recessed upward from the lower end of the second annular wall ₃₁₂ and become the upper flame opening portion 4Ua of the upper flame opening 4U, are formed in plurality with intervals in the circumferential direction and positions shifted in the circumferential direction relative to the first flame opening grooves _321. Thus, the upper flame opening portion 4Ua and the lower flame opening portion 4Ub are arranged in a staggered manner with positions shifted in the circumferential direction.

A third annular wall ₃₁₃ is suspended from the outer peripheral portion of the lower surface of the lower cap member 3L and is seated on the upper end of the outer cylinder 21 of the core body 2. A plurality of grooves are formed on the third annular wall ₃₁₃ , which are recessed upward from the lower end of the third annular wall ₃₁₃ and serve as the lower flame port 4L, at intervals in the circumferential direction.

In addition, the ignition electrode 11 and the thermocouple 12 as the flame detection element are attached to the gas stove core 1. At a single location in the circumferential direction of the lower cap member 3L, a target portion 33 (refer to FIG. 3 ) is protrudingly provided to face the ignition electrode 11. And, by the spark discharge between the ignition electrode 11 and the target portion 33, the lower flame port 4L is ignited. In addition, at the upper cap member 3U, a shielding portion 34 is protrudingly provided to prevent the ignition electrode 11 from falling due to cooking spillage and located at a single location in the circumferential direction corresponding to the setting portion of the ignition electrode 11. Furthermore, in order to prevent the cooking spillage from falling from the gap between the furnace core opening TPa and the gas furnace core 1, a covering ring 13 is inserted outside the furnace core body 2 to cover the furnace core opening TPa from above.

The gas furnace core 1 includes a first mixing tube 5U for the upper flame port 4U communicating with the space between the inner cylinder 22 and the middle cylinder 23 of the core body 2, and a second mixing tube 5L for the lower flame port 4L communicating with the space between the outer cylinder 21 and the middle cylinder 23 of the core body 2. The first mixing tube 5U is supplied with fuel gas through a first branch path 6U branched from the common gas supply path 6. The second mixing tube 5L is supplied with fuel gas through a second branch path 6L branched from the gas supply path 6. After that, in the first and second mixing tubes 5U and 5L, the fuel gas and the primary air sucked into the mixing tubes 5U and 5L are mixed. The mixed gas from the first mixing tube 5U is ejected from the upper flame port 4U through the "space between the inner cylinder 22 and the middle cylinder 23 of the core body 2" and the "space between the lower cap member 3L and the upper cap member 3U". In addition, the mixed gas from the second mixing tube 5L is ejected from the lower flame port 4L through the "space between the outer cylinder 21 and the middle cylinder 23 of the core body 2" and the "space between the outer cylinder 21 and the lower cap member 3L".

At the gas supply path 6, an "electromagnetic safety valve 61 which is forced to open at ignition and closed when flameout is detected due to the decrease in the electromotive force of the thermocouple 12" and a "gas main valve 62 which is opened at ignition and closed at flameout" are interposed. In addition, at the first and second branch paths 6U and 6L, the first and second flow regulating valves 63U and 63L which are linked to the operating member composed of a lever or a knob for adjusting the fire power (not shown) and change the opening are interposed. The operating member is capable of being operated from the weak fire position to the strong fire position. If the operating member is operated from the weak fire position to the 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 will not be opened until the operating member reaches a specific middle position, and will be opened rapidly to a specific opening when it exceeds the middle position, and then the opening will be gradually increased by operating toward the strong fire position. When the operating member is operated from the weak fire position to the middle position, the mixed gas is supplied to the upper flame port 4U, and the fire is transferred from the lower flame port 4L to the upper flame port 4U.

Here, in the present embodiment, as shown in FIG. 4( a ), a tapered surface that decreases in diameter upward is added to the inner circumferential surface of the second annular wall 31 _2. Furthermore, as shown in FIG. 4( b ), the circumferential width of each second flame opening groove 32 ₂ gradually increases toward the radial inner side of the second annular wall 31 _2. Specifically, the tapered angle θa of the inner circumferential surface of the second annular wall 31 ₂ is set to 40°, for example, and the expansion angle θb of the circumferential width of each second flame opening groove 32 ₂ toward the radial inner side of the second annular wall 31 ₂ is set to 10°, for example. Furthermore, the shape of the entrance _322a of each second flame opening groove ₃₂₂ opened at the inner peripheral surface of the second annular wall ₃₁₂ as viewed from the radial inner side of the second annular wall ₃₁₂ is formed as a trapezoid with the upper base larger than the lower base as shown in FIG4(c). In addition, in FIG4(c), a grid line is applied at the entrance _322a of the second flame opening groove ₃₂₂ for easy observation.

According to this, since the width of the upper portion of the inlet portion _322a of the second flame opening groove ₃₂₂ is wider than the width of the lower portion, the mixed gas can easily flow 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 is increased at the upper portion. Therefore, the calorific value at the upper portion of the flame formed by the combustion of the mixed gas ejected from the upper flame opening portion 4Ua is increased, and the heating efficiency of the cooking container is improved.

In addition, in order to pull out the forming mold downward, a pull-out gradient of about 1° is added to the second flame opening groove ₃₂₂ , which expands the width downward. However, by adding the above-mentioned tapered surface to the inner circumferential surface of the second annular wall ₃₁₂ and expanding the circumferential width of each second flame opening groove ₃₂₂ as it moves radially inward, even if the above-mentioned pull-out gradient is added to the second flame opening groove ₃₂₂ , the shape of the entrance _322a of the second flame opening groove ₃₂₂ observed from the radially inward side can be set to a trapezoidal shape with a larger upper base than the lower base.

In addition, in this embodiment, the upper bottom surface of the second flame opening groove ₃₂₂ is tilted upward toward the radial outer side. This is to make the flame of the upper flame opening portion 4Ua easily rise upward and improve the heating efficiency of the cooking container. However, it is not necessary to make the upper bottom surface of the second flame opening groove ₃₂₂ tilted as described above.

Although the above description is directed to a gas furnace core 1 having flame ports 4U and 4L opened in two upper and lower stages on the outer circumference of the core cap 3, the present invention can also be applied to a gas furnace core having a structure in which flame ports are opened in one upper and lower stage on the outer circumference of the core cap. The following description will be directed to such a gas furnace core with reference to FIG. 5.

The gas furnace core 1 of the second embodiment shown in FIG. 5 comprises: a core body 2, which is supplied with mixed gas and protrudes from the top plate TP through the core opening TPa of the top plate TP; and a core cap 3, which is placed on the core body 2. The core body 2 is a double-layered cylindrical body having an outer cylindrical body 21 and an inner cylindrical body 22. The core cap 3 is annular, and a cylindrical portion 3a is suspended from the inner periphery thereof to be engaged with the inner cylindrical body 22 of the core body 2. An annular wall 31 is suspended from the outer periphery of the lower surface of the core cap 3 to be seated on the upper end of the outer cylindrical body 21 of the core body 2. In the annular wall 31, a plurality of flame opening grooves 32 are formed at intervals in the circumferential direction. The flame opening grooves 32 are formed upward from the lower end of the annular wall 31 and serve as the flame openings 4.

Here, the inner circumferential surface of the annular wall 31 is provided with a tapered surface that decreases in diameter upward as shown in FIG6(a), and each flame opening groove 32 is made to gradually increase in circumferential width toward the radial inner side of the annular wall 31 as shown in FIG6(b). The tapered angle θa of the inner circumferential surface of the annular wall 31 is the same as that of the first embodiment, and is set to 40°, for example, and the expansion angle θb of the circumferential width of each flame opening groove 32 toward the radial inner side of the annular wall 31 is also the same as that of the first embodiment, and is set to 10°, for example. Furthermore, the shape of the entrance portion 32a of each flame groove 32 opened at the inner peripheral surface of the annular wall 31 observed from the radial inner side of the annular wall 31 is, as shown in FIG6(c), constructed to be a trapezoid with a larger upper base than the lower base.

As a result, the mixed gas can easily flow into the upper part of the inlet 32a of the flame port groove 32, similar to the first embodiment. As a result, the flow distribution of the mixed gas at the flame port 4 is increased at the upper part. Therefore, the calorific value at the upper part of the flame formed by the combustion of the mixed gas ejected from the flame port 4 is increased, and the heating efficiency of the cooking container is improved. Furthermore, by adding the above-mentioned tapered surface to the inner circumferential surface of the annular wall 31 and expanding the circumferential width of each flame opening groove 32 as it moves toward the inner side in the radial direction, even if a pull-out gradient for pulling the forming mold downward is added to each flame opening groove 32, the shape of the inlet portion 32a of the flame opening groove 32 observed from the inner side in the radial direction can be set to a trapezoid with a larger upper base than the lower base.

Although the above description is made with reference to the drawings for the embodiments of the present invention, the present invention is not limited thereto. For example, in the first embodiment, the mixed gas is supplied to the upper flame port 4U and the lower flame port 4L from the first and second mixing tubes 5U and 5L respectively, but the mixed gas may be supplied to the upper flame port 4U and the lower flame port 4L from a common mixing tube.

1: Gas stove core

2: Furnace core

3: Hearth cap

3L: Lower cap component

3U: Upper cap component

21: Outer cylinder

22: Inner cylinder

23: Middle cylinder

31: Ring wall

31 ₁ : 1st annular wall

31 ₂ : Second annular wall

32: Flame Mouth Groove

32a: Entrance of the flame groove

32 ₁ : No. 1 flame groove

32 ₂ : Second flame groove

32 ₂ a: Entrance of the second flame groove

4: Flame mouth

4L: Lower flame port

4U: Upper flame port

4Ua: Upper flame port part

4Ub: Lower flame port part

[Fig. 1] is a perspective view of an important part of a gas furnace equipped with a gas furnace core of the first embodiment of the present invention. [Fig. 2] is a cross-sectional view taken along line II-II of Fig. 1. [Fig. 3] is a perspective view of a gas furnace core of the first embodiment. [Fig. 4] (a) is an enlarged cross-sectional view of an important part of the gas furnace core of the first embodiment, (b) is a cross-sectional view taken along line IVb-IVb of Fig. 4 (a), and (c) is a cross-sectional view taken along line IVc-IVc of Fig. 4 (a). [Fig. 5] is a cross-sectional view corresponding to Fig. 2 of a gas furnace equipped with a gas furnace core of the second embodiment of the present invention. [Fig. 6] (a) is an enlarged cross-sectional view of an important part of the gas furnace core of the second embodiment, (b) is a cross-sectional view cut along the VIb-VIb line of Fig. 6 (a), and (c) is a cross-sectional view cut along the VIc-VIc line of Fig. 6 (a).

2: Furnace core

3: Hearth cap

4: Flame mouth

21: Cylinder

31: Ring wall

32: Flame Mouth Groove

32a: Entrance of the flame groove

Claims (3)

A gas furnace core comprises: a core body supplied with a mixed gas; and a core cap placed on the core body and having a flame port opened at the outer peripheral surface; an annular wall is provided downwardly at the outer peripheral portion of the lower side of the core cap, and a plurality of flame port grooves are formed on the annular wall at intervals in the circumferential direction to form a flame port. The gas furnace core is characterized in that: a tapered surface that decreases in diameter upward is added to the inner circumference of the annular wall, and each flame opening groove is made to gradually expand in the circumferential direction toward the inner side of the radial direction of the annular wall. The shape of the entrance of each flame opening groove opened at the inner circumference of the annular wall observed from the inner side of the radial direction of the annular wall is a trapezoid with a larger upper base than the lower base. A gas furnace core comprises: a core body supplied with mixed gas; and a core cap placed on the core body and having two upper and lower flame ports opened at the outer peripheral surface. The core cap is composed of an annular lower cap member and an annular upper cap member. A lower flame port is defined between the core body and the lower cap member, and a lower flame port is defined between the lower cap member and the upper cap member. There is an upper flame port, On the upper peripheral portion of the lower cap member, a first annular wall is vertically provided, and on the lower peripheral portion of the upper cap member, a second annular wall is suspended and seated on the first annular wall, The upper flame port is divided into two upper and lower parts, an upper flame port part and a lower flame port part, and at the first annular wall, a concave portion is formed from the upper end of the first annular wall and is downwardly concave. The first flame opening groove of the lower flame opening portion is formed in multiple numbers with intervals in the circumferential direction. The second flame opening groove of the upper flame opening portion, which is formed by being recessed upward from the lower end of the second annular wall, is formed in multiple numbers with intervals in the circumferential direction and is offset in the circumferential direction relative to the first flame opening groove. The gas furnace core is characterized by: The inner circumferential surface of the second annular wall is provided with a tapered surface that decreases in diameter upward, and each second flame opening groove is configured such that the circumferential width gradually expands toward the radially inner side of the second annular wall. The shape of the entrance of each second flame opening groove opened at the inner circumferential surface of the second annular wall observed from the radially inner side of the second annular wall is a trapezoid with a larger upper base than the lower base. A gas stove, characterized by: It is equipped with a gas stove core as described in claim 1 or 2.

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