JP7145016B2 - stove burner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a burner for a stove provided with upper and lower flame ports opening to the outer peripheral surface of a burner head provided on a burner body.

Conventionally, as a burner for stoves of this kind, a state in which gas is supplied only to the lower stage flame port and a state in which gas is supplied also to the upper stage flame port can be freely switched. It is known that the flame spreads from the mouth to the upper flame mouth. This has the advantage that the heating power can be adjusted over a wide range from a low flame burning only in the lower flame port to a high flame burning in both the lower flame port and the upper flame port.

In general, the burner body has three inner and outer cylinders, that is, an outer cylinder, an intermediate cylinder, and an inner cylinder. and an annular upper head member having an inner circumferential portion vertically provided with a cylindrical portion fitted to the inner cylindrical portion of the burner body. A lower flame port is defined between the outer cylindrical body of the burner body and the lower head member, and an upper flame port is defined between the lower head member and the upper head member. Specifically, an annular wall on which the upper head member is seated is erected on the outer peripheral portion of the upper surface of the lower head member. A plurality of them are formed at intervals.

Here, the groove that will be the upper flame port formed in the annular wall is formed in a trapezoid with a draft angle for pulling out the molding die of the groove upward, that is, in a trapezoid with a narrow lower base and a wide upper base. be done. The width of the bottom side of the mold for forming the groove must be set to a certain extent necessary to ensure strength. Therefore, the width of the lower base of the trapezoid, which is the groove shape, cannot be set to a size smaller than the quenching distance, and the width of the upper base, that is, the width of the upper end of the upper flame port is wider than the quenching distance. end up In such a stove burner, if the vertical distance between the upper flame port and the lower flame port is short, backfire occurs at the upper flame port when the flame transfers from the lower flame port to the upper flame port. easier. The reason is as follows. In other words, it takes a certain amount of time for the gas ejection speed from the upper flame port to exceed the combustion speed after gas supply to the upper flame port is started. On the other hand, if the vertical distance between the upper flame port and the lower flame port is short, the time from the start of gas supply to the upper flame port to the spread of fire to the upper flame port is shortened. Then, the fire spreads before the gas ejection speed from the upper flame port rises above the combustion speed, and flashback occurs at the upper end of the upper flame port wider than the flame extinction distance.

In view of this, Japanese Patent Laid-Open No. 2002-100000 discloses a stove burner in which the vertical distance between the upper stage flame port and the lower stage flame port is increased. In this case, it takes time from the start of gas supply to the upper flame port until the flame spreads to the upper flame port. Therefore, the gas ejection speed from the upper flame port exceeds the combustion speed before the fire spreads to the upper flame port. As a result, it is possible to prevent flashback at the upper end of the upper flame port, which is wider than the flame extinguishing distance, when the flame spreads. However, increasing the vertical distance between the upper flame port and the lower flame port increases the size of the burner.

JP 2012-127563 A

SUMMARY OF THE INVENTION An object of the present invention is to provide a burner for a stove that can suppress flashback when the flame spreads to the upper stage flame port without increasing the size of the burner.

In order to solve the above-mentioned problems, the present invention is provided with upper and lower flame ports that open to the outer peripheral surface of a burner head provided on a burner body. A burner for a stove that can be freely switched between a state in which gas is supplied to the upper flame port, and a state in which gas is supplied to the upper flame port, and the flame spreads from the lower flame port to the upper flame port when gas supply to the upper flame port is started. The burner head has an inner and outer three-fold cylindrical body consisting of a cylindrical body, an intermediate cylindrical body, and an inner cylindrical body. It is composed of a lower head member and an annular upper head member having a tubular portion that is fitted to the inner tubular body of the burner body. A flame port is defined, and an upper stage flame port is defined between a lower head member and an upper head member. A second annular wall that is seated on the first annular wall is vertically provided on the outer peripheral portion of the lower surface of the head member. The first annular wall is provided with a plurality of grooves that are recessed downward from the upper end of the first annular wall and serve as lower flame port portions, and the second annular wall is provided with a second groove. A plurality of grooves that form an upper flame port portion recessed upward from the lower end of the annular wall are formed at intervals in the circumferential direction and are circumferentially offset from the grooves that form the lower flame port portion , The shape of the groove to be the lower flame mouth portion formed in the annular wall 1 is a trapezoid with a wider upper base than the lower base due to the draft angle of the mold for molding the groove. The shape of the groove that forms the upper flame mouth is a trapezoid with a wider bottom than the upper base due to the draft angle of the mold for forming the groove, and the widest part of the groove is the lower flame. It is characterized in that the width of the upper end portion of the groove serving as the mouth portion and the width of the lower end portion of the groove serving as the rising flame mouth portion is set to be equal to or less than the quenching distance .

According to the present invention, since the upper flame port is divided into upper and lower portions, the upper flame port portion and the lower flame port portion, the recess depth of the groove formed in each of the first and second annular walls is It is halved compared to the case where the flame mouth is not divided into upper and lower halves. Therefore, the widest part of the groove in relation to the draft angle of the mold for molding the groove, that is, the upper end of the groove that becomes the lower flame port part formed in the first annular wall, and the second annular wall The width of the lower end portion of the groove to be formed as the upper flame port portion can be made equal to or less than the quenching distance as described above . Therefore, by shortening the vertical distance between the lower flame port and the lower flame port so as not to increase the size of the burner, the time required for the fire to spread from the lower flame port to the upper flame port is reduced. is shortened, and even if the gas jet speed from the lower flame port and the upper flame port of the upper flame port reaches the combustion speed before it spreads, the lower flame port and the upper flame port of the upper flame port It is possible to prevent flashback when the fire spreads. Furthermore, since the upper flame mouth portion and the lower flame mouth portion are arranged in a staggered manner, the gas ejected from each of the upper flame mouth portion and the lower flame mouth portion is sufficiently separated from the periphery thereof. Secondary air is supplied. As a result, the flame formed in the upper flame port is shortened, and flame overflow, which is the flame overflowing to the outside of the bottom of the pan, can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the burner for stoves of embodiment of this invention. Sectional drawing of the burner for stoves of embodiment. The enlarged side view of the principal part of the burner for stoves of embodiment. 4 is a graph showing changes in the amount of gas supplied to the lower flame port and the upper flame port;

1 and 2, 1 is a stove burner according to an embodiment of the present invention. This burner 1 comprises a burner body 2 and a burner head 3 on the burner body 2. - 特許庁On the outer peripheral surface of the burner head 3, two upper and lower flame ports 4U and 4L are opened at intervals in the circumferential direction. In addition, in order to prevent incomplete combustion due to the flame coming into contact with the trivet tines of the burner head 3 located in the same direction as the trivet tines of the trivets arranged on the top plate of the stove, the burner head 3 is provided at a plurality of locations in the circumferential direction. , only the lower flame port 4L is formed without forming the upper stage flame port 4U.

In more detail, the burner body 2 has three inner and outer cylinders consisting of an outer cylinder 21 , an intermediate cylinder 22 and an inner cylinder 23 . The outer cylindrical body 21 is provided with a skirt portion 21a that hangs down from the outer periphery of its upper end portion. The burner head 3 includes an annular lower head member 31 having a cylindrical portion 31a vertically provided on the inner peripheral portion thereof to be fitted to the intermediate cylindrical member 22 of the burner body 2, and an inner cylindrical member 23 of the burner body 2 to the inner peripheral portion thereof. It is composed of an annular upper head member 32 vertically provided with a matching cylindrical portion 32a. A lower flame port 4L is defined between the outer cylindrical body 21 of the burner body 2 and the lower head member 31, and an upper flame port 4U is defined between the lower head member 31 and the upper head member 32. .

The upper flame port 4U is divided into two upper and lower portions, an upper flame port portion 4Ua and a lower flame port portion 4Ub. Specifically, a first annular wall 33 is erected on the outer peripheral portion of the upper surface of the lower head member 31 , and a second annular wall 33 is seated on the outer peripheral portion of the lower surface of the upper head member 32 . Two annular walls 34 are depending. A plurality of grooves are formed in the first annular wall 33 at intervals in the circumferential direction to form the lower flame mouth portion 4Ub recessed downward from the upper end of the first annular wall 33 . there is Further, in the second annular wall 34, grooves forming the upper flame port portion 4Ua recessed upward from the lower end of the second annular wall 34 are provided at intervals in the circumferential direction, and A plurality of the grooves are formed with their positions shifted in the circumferential direction with respect to the groove that forms the flame port portion 4Ub. As a result, the upper flame opening portion 4Ua and the lower flame opening portion 4Ub are arranged in a staggered manner with their positions shifted in the circumferential direction.

Referring to FIG. 3, the shape of the groove that is to be the lower flame port portion 4Ub formed in the first annular wall 33 is such that the upper base is greater than the lower base because of the draft angle for drawing out the mold of the groove upward. becomes a trapezoid with a wide width. The shape of the groove, which will be the upper flame port portion 4Ua formed in the second annular wall 34, is a trapezoid with a lower base wider than the upper base due to a draft angle for drawing out the mold of the groove downward. . Here, if the upper flame port 4U is divided into upper and lower portions, an upper flame port portion 4Ua and a lower flame port portion 4Ub, the recess depth of the groove formed in each of the first and second annular walls 33 and 34 is is halved compared to the case where the upper flame port 4U is not divided into upper and lower halves. Therefore, the widest portion of the groove in relation to the draft angle of the mold for molding the groove, that is, the upper end portion of the groove that will be the lower flame port portion 4Ub formed in the first annular wall 33, and the second annular The width of the lower end of the groove, which is formed in the wall 34 and serves as the flame opening portion 4Ua, can also be set to be less than the flame extinction distance (for example, 1.2 mm).

A third annular wall 35 that is seated on the upper end portion of the outer cylindrical body 21 of the burner body 2 is vertically provided on the outer peripheral portion of the lower surface of the lower head member 31 . The third annular wall 35 is provided with a plurality of grooves that are recessed upward from the lower end of the third annular wall 35 and serve as the lower stage flame port 4L at intervals in the circumferential direction. A target portion 36 facing an ignition electrode (not shown) is protruded from one position in the circumferential direction of the lower head member 31, and spark discharge between the ignition electrode and the target portion 36 causes the lower flame port 4L to is ignited.

The burner 1 also includes a first mixing pipe 5U for the upper flame port 4U communicating with the space between the intermediate cylinder 22 and the inner cylinder 23 of the burner body 2, and the outer cylinder 21 of the burner body 2 and the intermediate cylinder 5U. A second mixing pipe 5L for the lower flame port 4L communicating with the space between the cylindrical body 22 is provided. Fuel gas is supplied to the first mixing pipe 5U through a first branched channel 6U branched from the common gas supply channel 6. As shown in FIG. Fuel gas is supplied to the second mixing pipe 5L through a second branched passage 6L branched from the gas supply passage 6. As shown in FIG. Then, the fuel gas and the primary air sucked into the respective mixing pipes 5U, 5L are mixed in the first and second mixing pipes 5U, 5L, and the mixed gas from the first mixing pipe 5U is transferred to the middle of the burner body 2. Through the space between the cylindrical body 22 and the inner cylindrical body 23 and the space between the lower head member 31 and the upper head member 32, the fuel is ejected from the upper flame port 4U. Also, the mixed gas from the second mixing pipe 5L passes through the space between the outer cylindrical body 21 and the intermediate cylindrical body 22 of the burner body 2 and the space between the outer cylindrical body 21 and the lower head member 31 to the lower stage flame. It is ejected from the mouth 4L.

The gas supply path 6 is provided with a main valve 7 which is opened when ignited and closed when extinguished. Also, the first and second branch passages 6U and 6L are provided with first and second flow rate control valves whose opening changes in conjunction with operating members such as levers and knobs for thermal power control (not shown). 8U and 8L are interposed. The operating member can be operated from a low flame position to a high flame position. When the operating member is operated from the low flame position to the high flame position, the opening of the second flow control valve 8L gradually increases from the minimum opening. The amount of gas supplied to the lower flame port 4L gradually increases from a predetermined minimum amount QLmin necessary for preventing flashback at the lower flame port 4L to a maximum amount QLmax, as indicated by line a in FIG. On the other hand, the first flow control valve 8U is not opened until the operating member reaches a predetermined intermediate position, and when the intermediate position is exceeded, the first flow rate control valve 8U opens suddenly to a predetermined opening degree, and the subsequent operation to the high flame position increases the opening degree. Gradually increase. When the operating member is operated from the low flame position to the high flame position, gas is not supplied to the upper flame port 4U until it reaches the intermediate position, as indicated by line b in FIG. The amount of gas supplied to 4U suddenly increases to a predetermined minimum amount QUmin and then gradually increases to a maximum amount QUmax.

When the upper flame port 4U is also burned, the operation member is operated to the high flame position side beyond the intermediate position, gas supply to the upper flame port 4U is started, and the fire is spread from the lower flame port 4L to the upper flame port 4U. . Here, in the present embodiment, the upper end portion, which is the widest portion of the groove that becomes the lower flame port portion 4Ub of the upper flame port 4U, and the widest portion of the groove that becomes the upper flame port portion 4Ua of the upper flame port 4U. The width of the lower end portion, which is the portion where the flame becomes, can be made equal to or less than the quenching distance as described above. In addition, in this embodiment, the vertical distance between the lower flame port 4Ub of the upper flame port 4U and the lower flame port 4L is shortened so as not to increase the size of the burner 1 . Therefore, the time required for fire transfer from the lower flame port 4L to the upper flame port 4U is shortened, and the gas ejection speed from the lower flame port portion 4Ub and the upper flame port portion 4Ua of the upper flame port 4U becomes equal to or higher than the burning speed. may catch fire. However, in the present embodiment, as described above, the width of the upper end, which is the widest portion of the groove that becomes the lower flame port 4Ub, and the width of the lower end, which is the widest portion of the groove that becomes the upper flame port 4Ua. can be made equal to or less than the quenching distance, even if the gas jet speed from the lower flame port portion 4Ub or the upper flame port portion 4Ua spreads before it reaches the combustion speed or higher, the lower flame port portion 4Ub and the upper flame port Backfire does not occur when the fire spreads in the portion 4Ua.

In addition, since the upper flame opening portion 4Ua and the lower flame opening portion 4Ub are arranged in a zigzag manner, secondary air is sufficiently supplied from the surroundings of the gases jetted out individually from the upper flame opening portion 4Ua and the lower flame opening portion 4Ub. is supplied. As a result, the flame formed in the upper flame port 4U is shortened even in a high flame state, and flame overflow, which is overflowing to the outside of the pot bottom, can be suppressed.

Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

REFERENCE SIGNS LIST 1 burner for stove, 2 burner body, 21 outer cylindrical body, 22 intermediate cylindrical body, 23 inner cylindrical body, 3 burner head, 31 lower head member, 31a cylindrical portion of lower head member, 32 ... Upper head member 32a... Cylinder portion of upper head member 33... First annular wall 34... Second annular wall 4U... Upper flame port 4Ua... Upper flame port portion 4Ub... Lower flame port portion 4L: Lower burner.

Claims (1)

A burner head provided on a burner body is provided with upper and lower flame ports that open to the outer peripheral surface of the burner head, and the state of supplying gas only to the lower flame port and the state of supplying gas to the upper flame port can be switched freely. , a stove burner configured to cause fire to spread from the lower flame port to the upper flame port at the start of gas supply to the upper flame port,
The burner body has three inner and outer cylinders, that is, an outer cylinder, an intermediate cylinder, and an inner cylinder, and the burner head has an inner cylinder fitted to the intermediate cylinder of the burner body. and an annular upper head member having a tubular portion that fits in the inner tubular body of the burner body. A lower flame port is defined between the member, and an upper flame port is defined between the lower head member and the upper head member,
A first annular wall is erected on the outer peripheral portion of the upper surface of the lower head member, and a second annular wall is vertically provided on the outer peripheral portion of the lower surface of the upper head member, the second annular wall being seated on the first annular wall,
The upper flame opening is divided into upper and lower flame openings and a lower flame opening, and the lower flame opening is recessed downward into the first annular wall from the upper end of the first annular wall. A plurality of grooves are formed at intervals in the circumferential direction, and in the second ring-shaped wall, grooves that serve as an upper flame port recessed upward from the lower end of the second ring-shaped wall are spaced at intervals in the circumferential direction. And, a plurality of grooves are formed at different positions in the circumferential direction with respect to the groove that serves as the lower flame port ,
The shape of the groove, which is the lower flame port portion formed in the first annular wall, is a trapezoid with a wider upper base than the lower base due to the draft angle of the mold for molding the groove, and the second annular wall. The shape of the groove that will be the upper flame mouth part formed in the groove is a trapezoid with a width of the lower base that is wider than the upper base due to the draft angle of the mold for forming the groove. 1. A burner for a stove, characterized in that the width of the upper end of the groove serving as the flame mouth and the width of the lower end of the groove serving as the upper flame mouth are set to be equal to or less than the quenching distance .

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