TWI443289B - Burner for stove - Google Patents

Description

Stove burner

The present invention relates to a burner for a cooktop having a lower two-stage fire opening formed on an outer peripheral surface of a burner head provided on a burner body.

Conventionally, as such a burner for a stove, there is known a type in which the gas can be arbitrarily switched to a state in which only the gas is supplied to the lower portion of the burner, and the state in which the gas is supplied to the upper portion of the burner is started, and the gas is supplied to the upper portion of the burner from the lower portion. The upper section of the fire is ignited (see, for example, Patent Document 1). Among them, there is the advantage that the fire can be widely adjusted from the weak fire burning only in the following section to the strong fire of the following sections and the upper two burners.

Here, in the case described in Patent Document 1, the distance between the lower section and the upper section is set to be more than three times the size of the lower section of the lower section, and the lower section of the burner is as small as possible. The firepower of the object being heated. However, when the gas supply to the upper portion of the fire is started, the upper portion of the fire is too late to immediately ignite the amount of gas released from the upper portion of the fire during the period, and a large ignition sound is apt to occur.

In order to eliminate the related deficiencies, some people have considered that the upper part of the lower part of the fire mouth has a larger size in the up and down direction than the other lower part of the fire mouth, and the upper end is used as the ignition crater above the upper end of the other lower part of the fire mouth, and the upper part of the fire is quickly ignited from the ignition crater. However, we have found that if the ignition crater is set up so as to quickly ignite the upper crater, it will be prone to backfire in the upper section. That is, when the supply of gas to the upper section of the crater is started, even if the amount of supply gas supplied to the upper section of the crater is increased to the amount required to prevent backfire in the upper section of the crater, the amount of gas ejected from the upper section of the crater is increased to a predetermined amount. It still takes time. Further, if the actual amount of gas to be ejected from the upper portion of the fire is increased to a predetermined amount before being ignited by the lower portion of the burner, the burning speed will exceed the gas ejection speed ejected from the upper portion of the burner and cause a backfire.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent No. 3586976 (Fig. 3)

In view of the above circumstances, an object of the present invention is to provide a burner for a stove which can prevent backfire when the upper section of the fire is ignited from the lower section and does not generate a large ignition sound.

In order to solve the above problems, the present invention is a burner for a cooker having a second upper portion of an opening formed on an outer peripheral surface of a burner head provided on a burner body, and is capable of arbitrarily switching a state in which only gas is supplied to the lower portion of the burner. In the state of supplying gas to the upper section of the fire, the upper section of the fire is ignited by the lower section of the fire when the gas supply to the upper section is started. The characteristic is that one part of the lower section is larger in the up and down direction than the other lower section, and the upper end is located above the upper end of the other lower section. The ignition crater is set to be within a range of 2.5 times or less of the upper and lower direction of the pilot burner at the upper end of the pilot burner and the lower end of the upper section, thereby preventing the actual amount of gas discharged from the upper section from reaching the upper section. The fire mouth is required to prevent the backfire from being ignited by the ignition crater before the upper part of the fire.

Here, if the distance between the upper end of the pilot burner and the lower end of the upper section is too short, when the gas supply to the upper section is started, the amount of supply gas supplied to the upper section of the burner is increased to the amount required for the upper section to prevent backfire. The actual amount of gas emitted from the upper section of the fire will also ignite the upper section of the fire by the pilot burner before reaching the above-mentioned level, and there is a backfire. On the other hand, in the present invention, the distance between the upper end of the pilot fire port and the lower end of the upper fire port is set to prevent the actual amount of gas to be ejected from the upper portion of the fire port to be higher than the amount required for the upper portion of the fire port to prevent backfire. The fire ignites the upper section of the fire, thus preventing backfire during ignition. Moreover, if the distance in the vertical direction is 1.5 times or more of the dimension in the vertical direction of the pilot burner, it is possible to prevent the actual amount of gas to be ejected from the upper section of the fire to be ignited by the pilot burner before the amount of the upper portion of the burner is prevented from being reversed. The upper section of the fire. If the distance in the up-and-down direction exceeds 2.5 times the size of the upper and lower directions of the pilot fire, the upper fire will be too late, and the amount of gas released from the upper fire will be ignited immediately, and the ignition sound will be large. On the other hand, in the present invention, since the vertical distance is set to be 2.5 times or less of the size of the ignition flame in the vertical direction, the ignition of the upper stage is not too late, and the generated ignition sound is not large.

The pilot fire port with a large size in the up and down direction is only a part of the lower section of the fire mouth, and the upper end position of the lower section of the fire mouth other than the pilot fire mouth can be sufficiently low regardless of the ignition of the upper section. Therefore, it is possible to sufficiently reduce the firepower of the object to be heated only when the following section of the burner is burned, and to ensure a wide adjustment range of the firepower.

Further, in the present invention, on the outer peripheral surface of the burner head, an overhanging surface which protrudes outward in the radial direction from the upper end of the pilot burner may be formed. Further, if the amount of protrusion of the overhanging surface with respect to the radially outer end of the pilot burner is 1/3 or more of the size of the pilot burner in the vertical direction, the flame generated by the pilot burner can be suppressed from rising even if the flame is raised. The distance in the up-and-down direction is shorter than 1.5 times the size in the up-and-down direction of the pilot fire port, and the actual amount of gas to be ejected from the upper fire port can be prevented from igniting the upper portion of the fire port before the upper portion of the fire port is required to prevent backfire. Here, shortening the distance in the vertical direction increases the size of the upper and lower flames in the vertical direction, and is useful for increasing the firepower at the time of strong fire. Moreover, if the amount of protrusion of the overhanging surface relative to the radially outer end of the pilot burner is more than one time in the vertical direction of the pilot burner, the ignition of the upper section is poor, so the amount of protrusion should be set to The ignition burner is 1/3 to 1 times the size of the up and down direction.

And in the same direction as the plurality of short claws of the short seat placed on the top plate of the stove, the portion of the burner head is aligned with the short claw portion, and if the upper portion of the short claw is formed, the upper portion is formed. The flame produced in the upper section of the fire will contact the short claws without burning completely. Therefore, it is preferable that the upper portion of the crater is not formed in the alignment portion of each of the lower jaws and only the lower portion of the crater is formed. And the size of the upper part of the fire mouth formed in the lower part of the alignment part of the short claw is relatively small, and the flame does not contact the short claw. Therefore, when only the following section of the burner is burned, the heat generated in the aligned portion of the pawl is reduced compared to the other portions, and the heat distribution is not uniform. Here, if the ignition crater is formed in the circumferential portion adjacent to the alignment portion of each of the squat claws, the heat generated by the igniting crater can be compensated for the heat reduction of the aligning portion of the pawl, and only The heat distribution of the following sections is uniform when burning.

Referring to Fig. 1, the A-type cooker body, B-covering the top plate on the upper surface of the cooker body A, and the burner burner 1 facing the burner opening B1 opened in the top plate B. Further, on the top plate B, a small seat C that surrounds the burner opening B1 and placed on the object to be heated such as a pan heated by the cooker 1 is placed. Further, the squat C is composed of a ring-shaped short frame C1 and a plurality of short claws C2 radially attached to the low frame C1.

The burner 1 includes a burner body 2 that extends through the burner opening B1 and a burner head 3 on the burner body 2. As shown in FIG. 2, the outer peripheral surface of the burner head 3 has a plurality of openings formed in the upper and lower two-stage fire ports 4U and 4L at intervals in the circumferential direction. Further, a plurality of portions of the burner head 3 in the same direction as the plurality of short legs C2 of the squat C are used as the pawl aligning portion 3a, and the short claws are aligned with the portion 3a to prevent flame contact. The claw C2 causes incomplete combustion, and does not form the upper section 4U but only forms the lower section 4L.

The burner body 2 is composed of an outer cylinder 21, an intermediate cylinder 22, and an inner and outer cylinder of the inner cylinder 23. The outer tubular body 21 is provided with a skirt portion 21a that hangs from the outer periphery of the upper end portion thereof. Further, the covering ring D covering the opening B1 of the burner for the top plate B is inserted into the skirt portion 21a, and the ring D can be covered to prevent the intrusion of the soup from the burner opening B1. Further, the protrusion C3 is provided at one or a plurality of positions in the circumferential direction of the squat C frame C1, and the notch D1 of the fitting protrusion C3 is formed on the outer circumference of the cover ring D to determine the phase of the seat C.

The burner head 3 is provided with an annular lower head member 31 that fits the cylindrical portion 31a of the intermediate cylinder 22 of the burner body 2, and a cylinder that is fitted with the inner tubular body 23 of the burner body 2 on the lower surface. The disc-shaped upper member 32 of the portion 32a is constituted. An upper annular member 33 is seated on the outer peripheral portion of the upper surface of the lower member 31 with the upper member 32 seated thereon. In the upper annular wall 33, a plurality of grooves are formed which are recessed from the upper end surface thereof at intervals in the circumferential direction, and are connected to the upper portion 4U. Further, the upper ends of the grooves are closed by the upper member 32, whereby the upper portion 4U is partitioned between the lower member 31 and the upper member 32.

Further, on the outer peripheral portion of the lower surface of the lower member 31, an annular wall 34 seated below the upper end portion of the outer tubular body 21 of the burner body 2 is suspended. In the lower annular wall 34, a plurality of grooves are formed which are recessed upward from the lower end surface thereof at intervals in the circumferential direction, and are grooved in the lower portion of the fire port 4L. Further, the lower ends of the grooves are closed by the upper end portion of the outer cylindrical body 21, whereby the lower portion of the burner 4L is partitioned between the burner body 2 and the lower head member 31.

Further, in the lower section of the fire port 4L, as shown in Fig. 3, there are a plurality of types of fire ports having different sizes in the vertical direction. Further, the lower portion 4L formed in the lower portion of each of the lower claw alignment portions 3a is for preventing the flame from contacting the short claw C2, and the upper and lower direction is relatively small in size, and is formed in the circumferential portion between the short claw alignment portions 3a. The lower section of the fire port 4L having a relatively large size in the up and down direction. Further, if such a large lower section 4B is continuously formed, the combustibility is deteriorated, so that a large lower section 4L and a small lower section 4L are alternately formed.

And adjacent to each of the lower pawl alignment portions 3a, the fire port 4L formed in the lower portion of the circumferential direction portion has the largest size in the up-and-down direction, and the upper end is located above the ignition port 4La of the upper portion of the lower portion of the lower portion 4L. Specifically, the size of the lower portion of the lower fire port 4L other than the pilot fire port 4La is smaller than the upper and lower dimensions of the lower annular wall 34, and the size of the upper and lower directions of the pilot fire port 4La is the same as the size of the lower annular wall 34 in the vertical direction. And a portion between the outer circumferential surface of the burner head 3 between the fire port 4U and the lower fire port 4L, that is, a portion of the outer peripheral surface of the lower member 31 between the upper annular wall 33 and the lower annular wall 34, forming a radially outward direction The protrusions 35 are slightly extended.

The burner 1 for a stove further includes: a first mixing tube 5U for the upper portion 4U, a space between the intermediate tube 22 and the inner tube 23 of the burner body 2; and a second mixing tube 5L for the lower portion 4L for continuous combustion. The space between the outer cylinder 21 and the intermediate cylinder 22 of the body 2.

Referring to Fig. 2, the first branch pipe 6U branched from the common gas supply path 6 supplies fuel gas to the first mixing pipe 5U, and the second branch pipe 6L branched from the gas supply path 6 supplies the second mixing pipe 5L. Fuel gas. Further, in the first and second mixing tubes 5U and 5L, the fuel gas and the primary air sucked by the respective mixing tubes 5U and 5L are mixed, and the mixed gas from the first mixing tube 5U is passed through the intermediate body 22 of the burner body 2 and The space between the inner cylinders 23 and the space between the lower head member 31 and the upper head member 32 are ejected from the upper stage crater 4U, and the mixed gas from the second mixing tube 5L passes through the outer cylinder 21 and the intermediate cylinder of the burner body 2. The space between 22 and the space between the outer cylindrical body 21 and the lower head member 31 are ejected from the lower stage fire port 4L.

The gas supply path 6 is provided with a source valve 7 that is opened when the fire is turned off, and is turned off when the flame is turned off, and the first and second branch paths 6U and 6L are inserted with the firepower adjustment handle or the grip that is omitted. Each of the first and second flow rate adjusting valves 8U and 8L having a change in opening degree is formed by the operating member. The operating member can be operated from a weak fire position to a strong fire position. When the operating member is operated from the weak fire position to the strong fire position, the opening degree of the second flow rate adjusting valve 8L is gradually increased from the minimum opening degree. Further, the amount of supply gas supplied to the lower stage port 4L is indicated by a line in Fig. 5, and the predetermined minimum amount QLmin required for preventing backfire from the lower stage port 4L is gradually increased to the maximum amount QLmax. On the other hand, the first flow rate adjusting valve 8U does not open the valve until the operating member reaches the predetermined intermediate position, and rapidly opens to a predetermined opening degree when the intermediate position is exceeded, and then gradually increases the operating opening degree toward the strong fire position. Further, when the operating member is operated from the weak fire position to the strong fire position, as shown by the line b in Fig. 5, the gas is supplied to the upper portion 4U at the intermediate position, and the supply of the upper portion 4U is increased when the intermediate position is exceeded. As for the upper limit 4U, the predetermined minimum amount QUmin required to prevent backfire is gradually increased to the maximum amount QUmax.

Specifically, the total area of the lower section 4L is 163.5mm ² , and when the total area of the upper section 4U is 256.6mm ² , the QLmin is set to 330kcal/h (2.0kcal/h/mm ² for the crater load), QLmax is 740kcal/h (4.5kcal/h/mm ² for crater load), QUmin 850kcal/h (3.3kcal/h/mm ² for vent load), QUmax is 3810kcal/h (for crater load) The word is 14.8kcal/h/mm ² ).

When the upper section 4U is also burned, the self-ignition burner 4La ignites the upper section 4U and operates the operating member beyond the intermediate position toward the strong fire position side. Once the intermediate position is exceeded, the amount of supply gas supplied to the upper section 4U will suddenly increase to QUmin, but it takes time to increase the amount of actual gas ejected from the upper section 4U to QUmin. As a result, the operating member is displaced from the intermediate position toward the strong fire position side by a certain amount. Before the position shown by c in Fig. 5, the actual amount of the discharged gas from the upper fire port 4U cannot be increased to QUmin instantaneously. Further, before the actual amount of gas to be ejected from the upper section 4U is above QUmin, if the upper section 4U is ignited by the pilot burner 4La, the burning speed will exceed the gas discharge speed from the upper section 4U and the backfire will occur.

Here, the distance between the upper end of the pilot burner 4La and the lower end of the upper section 4U is LH, and the size of the upper and lower sides of the pilot burner 4La is Lh. If LH<1.5Lh, the operating member exceeds the intermediate position to the strong position. At the end of the time, before reaching the position of c in Fig. 5, that is, before the actual amount of gas discharged from the upper section 4U is above QUmin, the upper section 4U is ignited by the pilot burner 4La, that is, there is a backfire. On the other hand, it has been experimentally confirmed that if LH ≧ 1.5 Lh, it is possible to prevent the upper vent 4U from being ignited by the pilot burner 4La before the actual amount of gas discharged from the upper section 4U is above QUmin, and no backfire is generated. And if LH>2.5Lh, it will be too late to ignite the upper section 4U. For this period, the amount of gas released from the upper section of the 4U is immediately ignited, and the ignition sound is large. On the other hand, it has also been experimentally confirmed that if LH ≦ 2.5Lh, it will not be too late to ignite the upper section of the fire 4U, and the ignition sound generated is not large. Therefore, in order to prevent the backfire and the large ignition sound when the upper fire port 4U is ignited by the pilot fire port 4La, 1.5 Lh ≦ LH ≦ 2.5 Lh is required. In the present embodiment, LH is set to be about 2Lh.

Further, in the present embodiment, the pilot fire port 4La having a large vertical dimension is only one of the lower fire ports 4L, and the upper end position of the lower fire port 4L other than the pilot fire port 4La can be sufficiently reduced without considering the upper fire port 4U. Therefore, it is possible to sufficiently reduce the firepower of the object to be heated only when the fire is 4L in the following section, and it is possible to ensure a wide adjustment range of the firepower.

And formed in the lower direction of the lower portion of the lower portion 4a of the lower claw positioning portion 3a, the dimension is relatively small, so that only the lower portion of the fire port 4L is burned, and the heat generated by the lower claw alignment portion 3a is lower than that of the other portion. However, in the present embodiment, the ignition crater 4La is formed on both sides in the circumferential direction adjacent to the respective pawl aligning portions 3a, so that the large flame generated by the igniting burner 4La can be compensated for the stalk alignment. The heat of the portion 3a is lowered to achieve uniformity of heat distribution only when the following section of the burner is 4L.

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

The second embodiment is different from the first embodiment in that the lower peripheral portion of the lower portion of the burner head 3 in which the lower portion of the burner 4L is opened (the outer peripheral surface of the lower annular wall 34) is shifted radially inward from the first embodiment. Forming an overhanging surface 36 extending outward from the upper end of the pilot fire port 4La toward the outside in the radial direction. The third embodiment differs from the first embodiment in that the outer diameter of the projecting portion 35 formed on the outer peripheral surface portion of the head member 31 between the upper annular wall 33 and the lower annular wall 34 is smaller than that of the first embodiment. Large, forming an overhanging surface 36 extending from the upper end of the pilot fire port 4La toward the radially outer side.

According to the second and third embodiments, the overhanging surface 36 can suppress the rise of the flame generated by the pilot burner 4La. Therefore, even if the distance LH between the upper end of the pilot fire port 4La and the lower end of the upper fire port 4U is set to be 1.5 times, that is, 1.3 Lh, which is less than the upper and lower direction dimension Lh of the pilot burner 4La, the actual discharge from the upper section 4U can be prevented. Before the gas volume is above QUmin, the upper section of the fire is ignited 4U, and no backfire is generated during the ignition. Moreover, shortening the LH will increase the size of the upper section of the upper section 4U, which is useful for increasing the firepower at the strong fire position.

Further, if the amount of protrusion of the overhanging surface 36 with respect to the upper end of the pilot burner 4La in the radial direction is R, R < Lh / 3, that is, the flame generated by the pilot burner 4La cannot be suppressed from rising, and if LH is set, <1.5Lh, there is a backfire when igniting. And if R>Lh, it will produce a poor ignition of the upper section 4U. Therefore, it is preferable to set Lh/3≦R≦Lh, and set R to about 0.7Lh in the second and third embodiments.

A. . . Stove body

B. . . roof

B1. . . Burner opening

C. . . Low seat

C1. . . Short seat frame

C2. . . Short claw

C3. . . Protrusion

D. . . Coated ring

D1. . . gap

Lh. . . Up and down direction size

LH. . . Up and down direction

QLmax, QUmax. . . The maximum amount

QLmin, QUmin. . . Minimum amount

R. . . Uplift

1. . . Stove burner

2. . . Burner body

3. . . Burner head

3a. . . Squat claw alignment section

4La. . . Ignition

4L. . . Lower section

4U. . . Upper section

5L. . . Second mixing tube

5U. . . First mixing tube

6. . . Gas supply road

6L. . . Second branch road

6U. . . First branch road

7. . . Source valve

8L. . . Second flow regulating valve

8U. . . First flow regulating valve

21‧‧‧Outer cylinder

21a‧‧‧ skirt

22‧‧‧Intermediate cylinder

23‧‧‧Inside cylinder

31‧‧‧Bottom components

31a, 32a‧‧‧ Tube

32a‧‧‧Tube

32‧‧‧Upper components

33‧‧‧Upper annular wall

34‧‧‧ Lower annular wall

35‧‧‧Uplift

36‧‧‧Overhanging surface

Fig. 1 is a cross-sectional view showing a burner stove for a cooktop according to a first embodiment of the present invention.

Fig. 2 is a perspective view of the burner for a cooker according to the first embodiment.

Fig. 3 is a side view showing an important part of the burner for a cooktop according to the first embodiment.

Figure 4 is a cross-sectional view taken along the line IV-IV of Figure 3;

Fig. 5 is a graph showing changes in the amount of gas supplied to the lower section and the upper section.

Fig. 6 is a cross-sectional view corresponding to Fig. 4 showing a burner for a cooker according to a second embodiment.

Fig. 7 is a cross-sectional view corresponding to Fig. 4 showing a burner for a cooker according to a third embodiment.

LH. . . Up and down direction

Lh. . . Up and down direction size

4La. . . Ignition

4U. . . Fire mouth

twenty one. . . Outer cylinder

21a. . . Skirt

31. . . Lower member

32. . . Upper member

33. . . Upper annular wall

35. . . Uplift

Claims (4)

The utility model relates to a burner for a stove, which has an opening on the outer peripheral surface of the burner head provided on the burner body, and a second section of the fire opening, which can switch the state of supplying only the gas to the lower section and the state of supplying the gas to the upper section. When the gas supply to the upper section is started, the upper section of the fire is ignited by the lower section of the fire, which is characterized in that, in the part forming the upper section and the lower section, one of the following sections is used as the pilot burner, and the up and down direction is larger than the other section. The upper end is located above the upper end of the other lower section of the fire, and the distance between the upper end of the pilot burner and the lower end of the upper section is set to be within 2.5 times the size of the upper and lower sides of the pilot burner, and can be prevented from coming from The actual amount of gas to be ejected from the upper section of the fire ignites the upper section of the fire before the upper section of the fire is more than the quantitative amount required to prevent backfire. The burner for a cooktop according to the first aspect of the invention, wherein the vertical distance is set to be 1.5 to 2.5 times the size of the vertical direction of the pilot burner. The burner for a cooktop according to claim 1, wherein an outer surface of the burner head is formed with an overhanging surface extending outward from the upper end of the pilot burner and downwardly downward, and the overhang is formed The amount of protrusion of the surface with respect to the radially outer end of the pilot burner is set to be 1/3 to 1 times the size of the vertical direction of the pilot burner, and the distance in the up and down direction is set to be 1.5 times smaller than the size of the vertical direction of the pilot burner. . A burner for a cooktop according to any one of claims 1 to 3, wherein the burner is in the same direction as the plurality of short claws of the seat placed on the top plate of the stove. The portion is formed as a short claw positioning portion, and the upper portion of the crater is not formed at each of the lower claw aligning portions, and only the lower portion of the crater is formed, and the igniting crater is formed in a circumferential portion adjacent to the aligned portion of each of the squat portions.