JP5291696B2 - Stove burner - Google Patents

Description

  The present invention relates to a burner for a stove provided with upper and lower two-stage flame openings opened on an outer peripheral surface of a burner head provided on a burner body.

  Conventionally, this kind of stove burner can be switched between a state in which gas is supplied only to the lower stage nozzle and a state in which gas is also supplied to the upper stage nozzle, and the lower stage flame is started by supplying gas to the upper stage nozzle. There has been known one in which a fire is transferred from the mouth to the upper flame outlet (see, for example, Patent Document 1). In this case, there is an advantage that the heating power can be adjusted in a wide range from a low flame that is burned only at the lower flame outlet to a strong fire that is burned at both the lower and upper flame outlets.

  Here, in the thing of patent document 1, the up-down direction distance between a lower stage flame mouth and an upper stage flame mouth so that the thermal power with respect to a to-be-heated material when making it burn only with a lower flame mouth can be weakened as much as possible. Is set to at least three times the vertical dimension of the lower crater, and the position of the lower crater is made as low as possible. However, in this case, when the gas supply to the upper crater is started, the fire transfer to the upper crater is delayed, and during that time, a large amount of gas released from the upper crater is ignited at once, and a loud ignition sound is generated. It tends to occur.

  In order to solve this problem, a part of the lower flame outlet is a fire transfer flame outlet whose vertical dimension is larger than the other lower flame outlets and whose upper end is located above the upper ends of the other lower flame outlets. It is conceivable to quickly transfer the fire from the transition flame mouth to the upper flame mouth. However, it has been found that if a fire transfer port is provided in this manner and the fire is transferred quickly to the upper flame port, backfire is likely to occur at the upper flame port. That is, when gas is supplied to the upper flame outlet, even if the amount of gas supplied to the upper flame outlet is rapidly increased to a predetermined amount necessary to prevent backfire at the upper flame outlet, the amount of gas ejected from the upper flame outlet It takes some time to increase to a predetermined amount. Then, if the fire is transferred from the lower stage nozzle before the actual amount of the ejected gas from the upper stage nozzle increases to a predetermined amount, the combustion speed becomes higher than the gas ejection speed from the upper stage nozzle, and a backfire occurs.

Japanese Patent No. 3586974 (FIG. 3)

  In view of the above points, the present invention provides a stove burner that can prevent backfire at the time of fire transfer from the lower stage to the upper stage, and that does not generate a large ignition sound. It is said.

  In order to solve the above-described problems, the present invention includes a state in which two upper and lower flame openings opened on the outer peripheral surface of a burner head provided on a burner body, and a gas is supplied only to the lower flame outlet, In the stove burner that can be switched to the state where gas is supplied to the upper stage, and gas is transferred from the lower stage to the upper stage at the start of gas supply to the upper stage, a part of the lower stage, The vertical dimension is larger than the other lower crater, and the upper end is located above the upper end of the other lower crater, and between the upper end of the fire crater and the lower end of the upper crater. The vertical distance is within a range of 2.5 times or less the vertical dimension of the flame transfer port, and the actual amount of gas ejected from the upper flame port is equal to or greater than the predetermined amount necessary to prevent backfire at the upper flame port. It should be set at a distance that can prevent the fire from moving from the front to the upper stage. The features.

  Here, if the vertical distance between the upper end of the flame transfer port and the lower end of the upper flame port is too short, when the gas starts to be supplied to the upper flame port, the amount of gas supplied to the upper flame port is reduced. Even if it is rapidly increased to the required amount necessary to prevent backfire at the mouth, it will be transferred to the upper flame mouth from the fire flame before the actual amount of gas ejected from the upper flame mouth exceeds the predetermined amount, May cause fire. On the other hand, in the present invention, the vertical distance between the upper end of the flame transfer port and the lower end of the upper flame port is the place where the actual amount of gas ejected from the upper flame port is necessary to prevent backfire at the upper flame port. Since it is set at a distance that can prevent the fire from moving from the flame outlet to the upper flame outlet before the fixed amount or more, backfire at the time of the fire transfer can be prevented. In addition, if the vertical distance is 1.5 times or more the vertical dimension of the flame transfer port, the actual amount of gas ejected from the upper flame port is more than a predetermined amount necessary to prevent backfire at the upper flame port. It is possible to prevent the fire from moving from the flame outlet to the upper flame outlet before becoming. Further, if the vertical distance exceeds 2.5 times the vertical dimension of the flame transfer port, the fire transfer to the upper flame port is excessively delayed, and during that time, a large amount of gas is released from the upper flame port at once. There is a risk of ignition and a loud ignition sound. On the other hand, in the present invention, since the vertical distance is set to 2.5 times or less the vertical dimension of the flame transfer port, the flame transfer to the upper flame port is not excessively delayed and large ignition is performed. There is no sound.

  In addition, only a part of the lower flame outlet has a large vertical flame outlet, and the position of the upper end of the lower flame outlet other than the fire flame outlet considers the fire transfer to the upper flame outlet. And can be made sufficiently low. Accordingly, it is possible to sufficiently weaken the heating power with respect to the object to be heated when burning only at the lower flame mouth, and it is possible to secure a wide adjustment range of the heating power.

  In the present invention, a downward overhang surface may be formed on the outer peripheral surface of the burner head so as to project outward in the radial direction from the upper end of the flame transfer flame port. And, if the overhanging amount of the overhanging surface in the radial direction with respect to the upper end of the flame transfer port is set to 1/3 times or more of the vertical size of the flame transfer port, the rise of the flame generated in the flame transfer port Even if the vertical distance is set to be shorter than 1.5 times the vertical dimension of the flame transfer port, the actual amount of gas ejected from the upper flame port is necessary to prevent backfire at the upper flame port. Therefore, it is possible to prevent a fire from being transferred to the upper flame outlet before reaching a predetermined amount or more. Here, shortening the distance in the vertical direction is advantageous in that it increases the vertical dimension of the upper flame port and increases the heating power in a strong fire. It should be noted that if the overhanging amount of the overhang surface radially outward with respect to the upper end of the flame transfer flame outlet exceeds one time the vertical dimension of the flame transfer flame mouth, the flame transfer failure to the upper flame flame will occur. The amount of overhang should be set to 1/3 to 1 times the vertical dimension of the fire transfer flame mouth.

  In addition, when a plurality of parts in the circumferential direction of the burner head located in the same direction as the plurality of five virtue claws placed on the top plate of the stove are used as the five virtue claw matching parts, the upper flame mouth is formed in the five virtue claw matching parts. The flame generated in the upper flame outlet touches the five virtue claws and burns incompletely. For this reason, it is desirable to form only the lower stage flame mouth without forming the upper stage flame mouth in each of the five virtue claw matching portions. Furthermore, the vertical dimension of the lower flame mouth formed in the virgin nail matching portion needs to be relatively small so that the flame does not touch the virgin nail. Therefore, when burning only at the lower flame outlet, the amount of heat generated at the virgin claws matching portion is lower than that at the other portions, and the heat distribution becomes uneven. Here, if a fire transfer flame mouth is formed in the circumferential portion adjacent to each of the five virtue claw mating parts, the decrease in the amount of heat at the gortoku claws mating part is compensated by a large flame generated at the fire transfer flame mouth, and only at the lower flame mouth. It is possible to make the heat distribution uniform when burning.

Sectional drawing of the stove which comprises the burner for stove of 1st Embodiment of this invention. The perspective view of the burner for stove of 1st Embodiment. The side view of the principal part of the burner for stove of 1st Embodiment. Sectional drawing cut | disconnected by the IV-IV line of FIG. The graph which shows the change characteristic of the gas amount supplied to a lower stage flame mouth and an upper stage flame mouth. Sectional drawing equivalent to FIG. 4 of the stove burner of 2nd Embodiment. Sectional drawing equivalent to FIG. 4 of the stove burner of 3rd Embodiment.

  With reference to FIG. 1, A is a stove body, B is a top plate which covers the upper surface of the stove body A, and the stove burner 1 is installed facing the burner opening B1 established in the top plate B. Further, on the top plate B, a virtue C for placing an object to be heated such as a pan heated by the burner 1 is placed so as to surround the burner opening B1. The virtues C are composed of an annular virtuosity frame C1 and a plurality of virtues claws C2 attached radially to the virtuosity frame C1.

  The burner 1 includes a burner body 2 inserted through the burner opening B1 and a burner head 3 on the burner body 2. On the outer peripheral surface of the burner head 3, as shown in FIG. 2, a number of upper and lower two-stage flame openings 4U, 4L are opened at intervals in the circumferential direction. A plurality of circumferential portions of the burner head 3 located in the same direction as the plurality of five virtue claws C2 of the five virtue C are defined as five virtue claw matching portions 3a, and each of the five virtue claw matching portions 3a is touched by the flame. In order to prevent incomplete combustion, only the lower flame port 4L is formed without forming the upper flame port 4U.

  The burner body 2 is composed of an inner / outer triple cylinder including 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 the upper end portion. Then, a cover ring D that covers the burner opening B1 of the top plate B is extrapolated to the skirt portion 21a so that the infiltration of the spilled juice from the burner opening B1 can be prevented by the cover ring D. In addition, a protrusion C3 is provided at one or a plurality of circumferential positions on the inner periphery of the virtuosity frame C1 of the virtues C, and a notch D1 in which the protrusions C3 are fitted is formed on the outer periphery of the cover ring D. So that you can decide.

  The burner head 3 has an annular lower head member 31 having a cylindrical portion 31a fitted to the intermediate cylinder 22 of the burner body 2 on the inner periphery, and a cylinder fitted to the inner cylinder 23 of the burner body 2 on the lower surface. The upper head member 32 has a disk shape with a portion 32a suspended. An upper annular wall 33 on which the upper head member 32 is seated is erected on the outer peripheral portion of the upper surface of the lower head member 31. The upper annular wall 33 is formed with a large number of grooves that are recessed upward from the upper end surface thereof to form the upper flame opening 4U with an interval in the circumferential direction. The upper ends of these grooves are closed by the upper head member 32 so that the upper flame port 4U is defined between the lower head member 31 and the upper head member 32.

  Further, a lower annular wall 34 that is seated on the upper end portion of the outer cylinder 21 of the burner body 2 is suspended from the outer peripheral portion of the lower surface of the lower head member 31. The lower annular wall 34 is formed with a large number of grooves that form a lower flame opening 4L that is recessed upward from its lower end surface with a circumferential interval. The lower ends of these grooves are closed by the upper end portion of the outer cylindrical body 21 so that the lower flame port 4L is defined between the burner body 2 and the lower head member 31.

  Note that the lower flame outlet 4L includes a plurality of types of flame outlets having different vertical dimensions as clearly shown in FIG. The lower flame ports 4L formed in the five virtue claw matching portions 3a have a relatively small vertical dimension in order to prevent the flame from touching the five virtue claws C2, and between the five virtue claw matching portions 3a. A lower flame mouth 4L having a relatively large vertical dimension is formed in the circumferential direction portion of. In addition, if such a large lower flame mouth 4L is continuously formed, the combustibility deteriorates, and therefore, the large lower flame mouth 4L and the small lower flame mouth 4L are alternately formed.

  Further, the lower flame outlet 4L formed in the circumferential portion adjacent to each of the five virtue claw matching portions 3a has the largest vertical dimension and the upper end is located above the upper ends of the other lower flame outlets 4L. 4La. Specifically, the vertical dimension of the lower stage flame opening 4L other than the flame transfer flame opening 4La is made smaller than the vertical dimension of the lower annular wall 34, and the vertical dimension of the fire transfer flame opening 4La is set to the vertical direction of the lower annular wall 34. The dimensions are the same. Further, in a portion between the upper flame port 4U and the lower flame port 4L of the outer peripheral surface of the burner head 3, that is, a portion of the outer peripheral surface of the lower head member 31 between the upper annular wall 33 and the lower annular wall 34, An overhang portion 35 is formed to slightly protrude outward in the radial direction.

  The burner 1 further 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 an outer cylinder 21 between the burner body 2 and the middle. And a second mixing tube 5L for the lower flame port 4L that communicates with the space between the cylindrical body 22. Referring to FIG. 2, the fuel gas is supplied to the first mixing pipe 5U via the first branch path 6U branched from the common gas supply path 6, and the gas supply path 6L is supplied to the second mixing pipe 5L. The fuel gas is supplied through the second branch path 6L branched from. Then, the fuel gas and the primary air sucked into each mixing pipe 5U, 5L are mixed in each of the first and second mixing pipes 5U, 5L, and the mixed gas from the first mixing pipe 5U is intermediate between the burner body 2. The mixed gas from the second mixing pipe 5L is burned out from the upper stage flame port 4U 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 gas is ejected from the lower flame opening 4L through the space between the outer cylinder 21 and the intermediate cylinder 22 of the body 2 and the space between the outer cylinder 21 and the lower head member 31.

  The gas supply path 6 is provided with a main valve 7 that is opened at the time of ignition and closed at the time of fire extinguishing, and each of the first and second branch paths 6U and 6L includes a heating power adjusting lever and a knob not shown. First and second flow rate control valves 8U and 8L whose opening degree changes in conjunction with the operation member are interposed. The operation member can be operated from a low fire position to a high fire position. When the operation member is operated from the low fire position to the high fire position, the opening degree of the second flow rate control valve 8L gradually increases from the minimum opening degree. The amount of gas supplied to the lower stage nozzle 4L gradually increases from a predetermined minimum quantity QLmin necessary for preventing backfire at the lower stage nozzle 4L to a maximum quantity QLmax, as indicated by line a in FIG. On the other hand, the first flow rate adjusting valve 8U is not opened until the operation member reaches a predetermined intermediate position, and suddenly opens to a predetermined opening when the operation member exceeds the intermediate position. Increasing gradually. When the operation member is operated from the low fire position to the high fire position, as shown by the line b in FIG. 5, no gas is supplied to the upper flame outlet 4U until the intermediate flame position is reached. The amount of gas supplied to 4U rapidly increases to a predetermined minimum amount QUmin necessary for preventing backfire at the upper flame outlet 4U, and then gradually increases to the maximum amount QUImax.

More specifically, when the total area of the lower crater 4L is 163.5 mm ² and the total area of the upper crater 4U is 256.6 mm ² , the QLmin is 330 kcal / h (2.0 kcal / h at the throat load). h / mm ² ), QLmax is 740 kcal / h (4.5 kcal / h / mm ² at the flame load), QUmin is 850 kcal / h (3.3 kcal / h / mm ² at the flame load), and QUAmax is 3810 kcal / h It is set to h (14.8 kcal / h / mm < ² > by a flame mouth load).

  When the upper stage flame outlet 4U is also burned, the operation member is moved beyond the intermediate position to the high fire position side until the flame is transferred to the upper stage flame outlet 4U and transferred from the flame outlet 4La. When the intermediate position is exceeded, the amount of gas supplied to the upper flame outlet 4U rapidly increases to QUmin, but it takes some time before the actual gas amount ejected from the upper flame outlet 4U increases to QUmin. As a result, before the operating member reaches the position indicated by c in FIG. 5 which is displaced by a certain amount from the intermediate position to the high fire position side, the actual amount of gas ejected from the upper stage nozzle 4U does not increase instantaneously to QUImin. Then, if the gas is transferred from the flame transfer port 4La to the upper flame port 4U before the actual amount of gas ejected from the upper flame port 4U becomes equal to or higher than QUImin, the combustion speed is higher than the gas injection speed from the upper flame port 4U. Above that, a flashback occurs.

  Here, if the vertical distance between the upper end of the flame transfer port 4La and the lower end of the upper flame port 4U is LH, and the vertical dimension of the flame transfer port 4La is Lh, the operation is LH <1.5Lh. When the member is operated beyond the intermediate position to the high fire position, before reaching the position of c in FIG. 5, that is, before the actual amount of gas ejected from the upper stage flame outlet 4U becomes equal to or greater than QUImin, There is a risk of flashback from 4La to the upper flame outlet 4U. On the other hand, if LH ≧ 1.5Lh, it is possible to prevent the flame from moving from the flame port 4La to the upper flame port 4U before the actual amount of gas ejected from the upper flame port 4U becomes equal to or higher than QUmin. It has been experimentally confirmed that this does not occur. Further, if LH> 2.5Lh, the fire transfer to the upper flame outlet 4U is excessively delayed, and a large amount of gas released from the upper flame outlet 4U may be ignited at once, which may cause a loud ignition sound. is there. On the other hand, when LH ≦ 2.5Lh, it was experimentally confirmed that the fire transfer to the upper flame outlet 4U was not delayed too much and no large ignition sound was generated. Accordingly, in order to prevent backfire and generation of a loud ignition sound when transferring from the flame transfer port 4La to the upper flame port 4U, it is necessary to satisfy 1.5Lh ≦ LH ≦ 2.5Lh. In this embodiment, LH is set to about 2Lh.

  In the present embodiment, only a part of the lower flame outlet 4L has a large vertical flame opening 4La, and the position of the upper end of the lower flame outlet 4L other than the flame transfer flame opening 4La is the upper stage. It can be made sufficiently low without considering the fire transfer to the flame outlet 4U. Accordingly, it is possible to sufficiently weaken the heating power for the object to be heated when burning only by the lower stage nozzle 4L, and it is possible to secure a wide adjustment range of the heating power.

  In addition, in order to make the vertical dimension of the lower flame outlet 4L formed in the virgin claw matching portion 3a relatively small, the amount of heat generated in the virgin claw matching portion 3a is smaller than that of the other portion when burning only in the lower flame outlet 4L. Then decline. However, in the present embodiment, since the flame transfer ports 4La are formed on both sides in the circumferential direction adjacent to the five virtue claw matching portions 3a, a large flame is generated in the flame transfer port 4La due to a decrease in the amount of heat at the five virtue claw matching portions 3a. Thus, it is possible to make the heat distribution uniform when burning only with the lower flame outlet 4L.

  Next, a second embodiment shown in FIG. 6 and a third embodiment shown in FIG. 7 will be described. The basic configuration of each of the second and third embodiments is the same as that of the first embodiment, and the same members as those of the first embodiment are denoted by the same reference numerals.

  The difference of the second embodiment from the first embodiment is that the lower outer peripheral surface (the outer peripheral surface of the lower annular wall 34) of the burner head 3 where the lower flame opening 4L is opened is radially inward from the first embodiment. The downward overhanging surface 36 that protrudes outward in the radial direction from the upper end of the flame transfer port 4La is formed. Further, the third embodiment differs from the first embodiment in that the outer diameter of the overhang portion 35 formed on the outer peripheral surface portion of the lower head member 31 between the upper annular wall 33 and the lower annular wall 34 is the first. That is, the downward overhang surface 36 is formed so as to be larger than that of the embodiment and project outwardly in the radial direction from the upper end of the flame transfer port 4La.

  According to the second and third embodiments, the overhang surface 36 suppresses the rise of the flame generated at the fire transfer flame opening 4La. Therefore, the vertical distance LH between the upper end of the flame transfer port 4La and the lower end of the upper flame port 4U is set to, for example, 1.3Lh, which is less than 1.5 times the vertical dimension Lh of the flame transfer port 4La. However, it is possible to prevent fire from being transferred to the upper stage nozzle 4U before the actual amount of gas ejected from the upper stage nozzle 4U becomes equal to or higher than QUmin, and no backfire occurs at the time of fire transfer. Shortening the LH is advantageous because it increases the vertical dimension of the upper flame outlet 4U and increases the thermal power at the high fire position.

  In addition, when R <Lh / 3, where R is a radially outward projecting amount of the overhang surface 36 with respect to the upper end of the flame transfer port 4La, it is impossible to suppress the rise of the flame generated at the flame transfer flame port 4La. If LH <1.5Lh is set, there is a risk of flashback at the time of fire transfer. Further, if R> Lh, a defective fire transfer to the upper flame outlet 4U occurs. Therefore, it is preferable to set Lh / 3 ≦ R ≦ Lh. In the second and third embodiments, R is set to about 0.7 Lh.

  A ... Stove body, B ... Top plate, C ... Gotoku, C2 ... Gotoku claw, 1 ... Stove burner, 2 ... Burner body, 3 ... Burner head, 3a ... Gotoku nail mating part, 36 ... Overhang surface, 4U ... Upper flame outlet, 4L ... Lower flame outlet, 4La ... Fire transfer flame mouth, LH ... Vertical distance between upper end of fire transfer flame outlet and lower end of upper flame outlet, Lh ... Vertical dimension of fire transfer flame mouth, R: Overhang surface overhang amount.

Claims (4)

Equipped with two upper and lower flame openings opening on the outer peripheral surface of the burner head provided on the burner body, and it is possible to switch between a state where gas is supplied only to the lower stage and a state where gas is supplied also to the upper stage. In the stove burner that starts the gas supply to the upper crater and moves it from the lower crater to the upper crater.
A part of the lower crater is a fire transfer crater whose vertical dimension is larger than the other lower flares and whose upper end is located above the upper end of the other lower flares,
The vertical distance between the upper end of the flame transfer port and the lower end of the upper flame port is not more than 2.5 times the vertical dimension of the fire transfer port, and the actual amount of gas ejected from the upper flame port is A stove burner characterized in that the burner is set at a distance that can prevent fire transfer from the flame transfer port to the upper flame port before reaching a predetermined amount necessary to prevent backfire at the upper flame port.   2. The stove burner according to claim 1, wherein the vertical distance is set to 1.5 to 2.5 times the vertical dimension of the flame transfer port.   On the outer peripheral surface of the burner head, a downward overhang surface is formed projecting radially outward from the upper end of the fire transfer flame port, and the overhang surface extends radially outward from the upper end of the fire transfer flame port. The amount of overhang is set to 1/3 to 1 times the vertical dimension of the flame transfer flame opening, and the vertical distance is set to be shorter than 1.5 times the vertical dimension of the flame transfer flame opening. The stove burner according to claim 1.   A plurality of circumferentially located portions of the burner head located in the same orientation as a plurality of five virtue claws placed on the top plate of a stove are designated as five virtue claw matching portions, and the upper flame mouth is provided in each virtue claw matching portion. 4. Only the lower stage flame mouth is formed without forming, and the fire transfer flame mouth is formed in a circumferential direction portion adjacent to each of the five virtue claw matching portions. Stove burner.

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