JP2003336813A - Burner for cookstove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve combustion performance and enhance heat efficiency. <P>SOLUTION: A cylindrical portion 7c serving as a flow passage for secondary combustion air is formed at a center of a burner head 7. The cylindrical portion 7c is formed with a cylindrical extension portion 7d and is thereby formed longer than a cylindrical portion of a conventional burner. The burner head 7 is placed on a burner body 6 with the cylindrical portion 7c fitted in a central opening 6b of the burner body 6. The burner head 7 is heated to high temperature by flame made on a cookstove burner 3 and preheats secondary air A passing through the cylindrical portion 7c. As a result, the combustion performance of the cookstove burner 3 is improved, and a distance h between the cookstove burner 3 and a cooking pan P is reduced to enhance the heat efficiency. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stove burner provided with a burner head having a cylindrical secondary air passage in the center.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a table stove has a stove burner 103 arranged at a central position of an opening 2a provided in a top plate 2, and a juice tray 4 is placed around the stove burner 103. . The cooking pot P is placed on the Gotoku 105 provided around the cooking stove burner 103 and heated by the combustion of the cooking stove burner 103. Hob burner 10
3 includes a burner body 6 having a central opening 6b formed in the center and an annular mixture chamber 6a, and a burner head 107 having a plurality of main flame openings 107A formed on the outer peripheral edge by being mounted on the burner body 6. Consists of. The burner head 107
An internal flame port 107b is opened on the upper surface of the. Further, the Gotoku 105 is integrally configured by a plurality of Gotoku claws 105a on which the cooking pot P is placed and a Gotoku ring 5b which is a base of each of the Gotoku claws 105a, and is placed on the top plate 2.
A gap for supplying secondary air, which will be described later, is formed between the Gotoku ring 5 b and the soup tray 4.

This table stove has a stove burner 1
Burner head 1 as secondary air required when burning 03.
Secondary air A passing through the cylindrical portion 107c formed at the center of 07
(Solid line arrow in the figure) is supplied from the inside of the flame, and secondary air B (solid line arrow in the figure) passing between the Gotoku ring 5b, the top plate 2 and the soup saucer 4 is supplied from the outside. The secondary air is also supplied between the cooking pot P and the Gotoku ring 5b.

Further, as one of the methods for improving the heat efficiency of such a table stove, the contact area between the flame and the pan bottom is increased by shortening the distance h between the stove burner 103 and the pan bottom. A method of increasing the area is known.

[0005]

However, if the distance h between the stove burner 103 and the bottom of the pot is too close, the combustion performance deteriorates, so there is a limit distance.
Therefore, it is desired to improve the combustion performance of the stove burner 103 as much as possible and reduce the limit distance. A stove burner of the present invention aims to solve the above problems, improve combustion performance, and improve thermal efficiency.

[0006]

A stove burner according to claim 1 of the present invention, which solves the above problems, has a burner body having an annular mixture chamber with an opening formed in the center, and a large number of flames on the outer periphery. A burner head having radial openings and a cylindrical secondary air passage in the center, the secondary air passage of the burner head is fitted in the central opening of the burner body, and the burner head is attached to the burner head. The gist of the present invention is to provide a preheating means for preheating the secondary air for combustion introduced into the secondary air passage in the stove burner mounted on the main body.

The stove burner according to claim 2 of the present invention is the stove burner according to claim 1, wherein the preheating means is downward from the lower end of the secondary air passage formed in the burner head. The gist is that it is a cylindrical extension passage extending to.

Further, a stove burner according to a third aspect of the present invention is characterized in that, in the stove burner according to the second aspect, the extension passage is separate from the burner head.

The stove burner according to a fourth aspect of the present invention is the stove burner according to the second aspect, wherein the extension passage extends the lower end of the secondary air passage downward, whereby The gist is that it is integrally formed with the head.

In the stove burner according to claim 1 of the present invention having the above structure, the preheating means preheats the secondary combustion air introduced into the cylindrical secondary air passage formed in the center of the burner head. By doing so, the combustion performance is improved.

In the stove burner according to the second aspect of the present invention, the secondary air for combustion is supplied through the extension passage and the secondary air passage. At this time, since the extension passage is heated by the combustion heat of the flame formed in the stove burner to a high temperature, the secondary air for combustion is preheated before being introduced into the secondary air passage by the heat radiation from the extension passage. It And
The secondary air for combustion is further heated by heat radiation from the secondary air passage, and then used for combustion of the flame formed at the flame mouth.

Further, in the hob burner according to the third aspect of the present invention, the secondary passage for combustion is sufficiently provided by installing the extension passage formed as a separate body from the burner head from below the secondary air passage. It becomes a high performance burner that can be preheated.

Further, in the hob burner according to the fourth aspect of the present invention, since the extended passage can be formed only by extending the lower end of the secondary air passage of the burner head, the working is easy and the number of parts does not increase. .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the constitution and operation of the present invention described above, preferred embodiments of a stove burner of the present invention and a stove equipped with the stove burner will be described with reference to FIGS. 4 will be described. FIG. 1 is a sectional view of a table stove, FIG. 2 is a sectional view of a stove burner, and FIG. 3 is an external view of the table stove. 1 and 2 are cross-sectional views taken along one-dot chain line AA in FIG.
FIG. 2 is a diagram showing a state before the burner head is placed on the burner body. FIG. 4 is a cross-sectional view of a stove burner as another embodiment different from the embodiment shown in FIGS.

In the table stove 1, an opening 2a is provided in a top plate 2, a stove burner 3 is arranged at a central position of the opening 2a, and a juice tray 4 is placed on the outer peripheral edge of the opening. Above the stove burner 3, a Gotoku 5 on which the cooking pot P is placed is provided. The stove burner 3 is provided with a burner head 7 having a large number of slit-shaped flame mouth grooves 7a radially on the outer periphery and a burner body 6, and by placing the burner head 7 on the burner body 6, Multiple main flame outlets 7 on the outer periphery
A is formed. Further, an internal flame port 7b is opened on the upper surface of the burner head 7.

The burner body 6 is provided with a throat portion 6c for sucking the fuel gas and the primary air, and an annular air-fuel mixture chamber 6a for communicating with the throat portion 6c and mixing the fuel gas and the primary air. The annular air-fuel mixture chamber 6a has an upper surface opened and is closed by mounting the burner head 7. A central opening 6b is formed in the center of the annular mixture chamber 6a of the burner body 6, and a cylindrical portion 7c is formed in the center of the burner head 7 as a flow path for secondary combustion air. And
The burner head 7 is mounted on the burner body 6 by fitting the tubular portion 7c into the central opening 6b of the burner body 6.

The burner body 6 is composed of four members, a metal upper plate 6d, a lower plate 6e, a central cylinder 6f, and a mouth plate 6g, which are connected by caulking. Then, the lower end of the central opening 6b has a lower plate 6
The caulking portion 6h obtained by caulking the e and the central tube 6f has an opening diameter smaller than the inner diameter of the central opening 6b.
In addition, the outer diameter of the cylindrical portion 7c of the burner head 7 is approximately the same as the inner diameter of the central opening 6b up to the middle, and the cylindrical portion 7c and the central opening 6b are fitted together. Then, the structure becomes thinner from the middle to have an outer diameter smaller than the opening diameter of the caulking portion 6h, and the caulking portion 6h is inserted. Tube 7
The thinned portion of c is called the extension cylinder portion 7d,
The part that fits into the central opening 6b is referred to as the original cylinder 7e. That is, in the stove burner 103 having the conventional configuration, the length of the cylinder portion 107c of the burner head 107 was the same as the length of the original cylinder portion 7e, but in the stove burner 3 of the present embodiment, the extension cylinder portion 7d. To extend the tubular portion 7c,
The cylindrical portion 7c is configured to extend further below the lower end of the central opening 6b. That is, the burner head 7 of the present embodiment is formed by integrally processing the extension cylinder portion 7d with the burner head 107 by extending the lower end of the cylinder portion 107c of the conventional burner head 107.

The Gotoku 5 has a plurality of L-shaped Gotoku claws 5a on which the cooking pot P is placed, and the opening 2a of the top plate 2.
And the soup saucer 4 and the soup saucer 4 are covered with each other, and are integrally formed with a gotoku ring 5b which is a base on which the gotoku nail 5a is erected. An insertion piece 5c is provided at the lower tip of the Gotoku nail 5a, and the Gotoku 5 is positioned and mounted on the top plate 2 by inserting the insertion piece 5c into the Gotoku receiving hole 2b opened in the top plate 2. . Also, Gotoku Ring 5b
A gap for supplying secondary air is formed between and the top plate 2. The inner circumference side of the Gotoku ring 5b is inclined downward toward the center of the ring, and the inclined surface is the main flame outlet 7A.
And is formed almost parallel to the gas ejection direction at
The tip is brought close to the outer peripheral surface of the main flame port 7A. Further, an electrode 8 for ignition and a thermocouple 9 for flame detection are installed near the main flame port 7A.

According to the table stove 1 described above, when the stove burner 3 burns, the secondary air A that passes through the central cylindrical portion 7c of the burner head 7 as the required secondary air (solid arrow in the figure). And Gotoku ring 5b and top plate 2,
Secondary air B (solid arrow in the figure) passing between the soup tray 4 and the soup tray 4 is introduced. At this time, since the burner head 7 is heated by the flame formed on the stove burner 3 to reach a high temperature, the secondary air A is preheated before being burned by the heat radiation from the tubular portion 7c. Therefore, by forming the extension cylinder portion 7d in the cylinder portion 7c and making the cylinder portion 7c longer than in the case of the conventional burner head 107, it is possible to sufficiently preheat the secondary air A supplied from the inside of the flame. There is. That is, the secondary air A is preheated in the extension cylinder portion 7d before being introduced into the original cylinder portion 7e, and is sufficiently preheated. As a result, the temperature decrease of the flame can be prevented, and the combustion performance of the stove burner 3 is improved. Therefore, the heat efficiency can be improved by lowering the Gotokoku claw 5a and making the distance h between the stove burner 3 and the bottom of the pot closer to each other by an amount corresponding to the margin of improved combustion performance. Further, by preheating the secondary air A, it is possible to prevent the temperature of the flame from lowering, so the thermal efficiency is further improved. Further, by increasing the length of the cylindrical portion 7c, the draft force is improved and the secondary air A that is sucked in is increased.
The combustion performance is further improved due to the increase in the amount of.

Further, in order to preheat the secondary air A, it is not necessary to provide a special preheating means such as a heater, and it suffices to provide the extension cylinder portion 7d in the cylinder portion 7c of the burner head 7, so that it can be implemented at low cost. can do. Moreover, the extension cylinder portion 7
d is integrally formed with the burner head 7, and is a cylindrical portion 7c.
Since the construction is simply extended, the processing is easy, the number of parts does not increase, and the manufacturing cost can be extremely suppressed.

By the way, the inner flame port 7b has a main flame port 7A on the outer periphery.
The secondary air B supplied from the outside of the flame does not reach the inner flame port 7b because the secondary air B is surrounded by the flame formed in.
Therefore, most of the combustion secondary air supplied to the flame formed in the inner flame port 7b is the secondary air A passing through the tubular portion 7c. Therefore, for the stove burner 3 having the inner flame port 7b, preheating the secondary air A supplied from the inside of the flame as described above is particularly useful for improving its combustibility. .

Here, in order to make the features of the stove burner of the present invention easy to understand, experimental data of thermal efficiency and theoretical CO in the case of using the conventional stove burner, and in the case of using the stove burner of the present invention Table 1 shows the experimental data of.

[Table 1] However, as the stove burner 103 of the present embodiment, an example in which the extension cylinder portion 7d is formed integrally with the burner head 7 is shown, but this experimental data shows that the extension cylinder portion 7d is used as the burner head as shown in FIG. And a cylindrical body 207d (length 5
0 mm) to form the cylindrical portion 1 of the conventional burner head 107.
This is the data when the one driven into from the bottom of 07c is used. The theoretical CO is an index indicating the degree of incomplete combustion, and is calculated by the following formula from the values of CO and CO ₂ detected in the combustion exhaust gas. Theoretical CO = measured CO% / measured CO ₂ % × CO _2max CO _2max : concentration of carbon dioxide generated when fuel gas is completely combusted at a theoretical air ratio (λ = 1)

As shown in Table 1, the distance h from the cooking pot P, which was the limit of the conventional high-efficiency stove, can be shortened by 2 mm, and the thermal efficiency is improved by 1.2 points. Moreover, in this case, the theoretical CO value is kept lower than that of the conventional example, and the effect of improving the combustion performance by forming the extension cylinder portion and preheating the secondary air A is very large. I understand.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that various embodiments can be carried out without departing from the scope of the present invention. is there. For example, in the present embodiment, an example in which the extension cylinder portion 7d is formed integrally with the burner head 7 is shown, but the embodiment is not limited to this, and as described in the example of the experimental data, the burner head is used as the extension cylinder portion. A cylindrical body 207d separate from the head may be formed and attached to the cylindrical portion 107c of the burner head 107 having the conventional configuration from below, or a cylindrical portion extending downward in the central opening 6b of the burner body 6 may be formed. It may be formed. When the extension cylinder is formed separately from the burner head, it can be used as an optional adapter for improving the combustion performance of an existing stove burner in a general household. Therefore, even if the table stove is not replaced, a highly efficient table stove can be obtained simply by replacing the separately sold adapter and the Gotoku with the lowered height of the Gotoku nail. Also,
In the present embodiment, an example in which it is applied to a table hob has been described, but it may be applied to a built-in stove incorporated in a kitchen unit.

[0025]

As described in detail above, the first aspect of the present invention
According to the described stove burner, the combustion performance can be improved by preheating the secondary air, and the margin is widened under various combustion conditions. Therefore, the placing surface of the cooking pot can be brought closer to the stove burner by the amount of the margin, and the thermal efficiency can be improved. Moreover, by preheating the secondary air, the temperature of the flame formed on the stove burner can be prevented from lowering, and the thermal efficiency can be further improved.

Further, according to the stove burner of the second aspect of the present invention, the structure for preheating the secondary air is simple and can be implemented at a low cost.

Further, according to the stove burner of the third aspect of the present invention, the existing stove burner can be used as a high performance burner capable of sufficiently preheating the secondary air for combustion.

Furthermore, according to the stove burner of the fourth aspect of the present invention, the manufacturing cost can be particularly suppressed because the working is easy and the number of parts does not increase.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a table hob according to the present embodiment as seen from a side surface.

FIG. 2 is a cross-sectional view of a stove burner according to the present embodiment as seen from a side surface.

FIG. 3 is an external view of a table hob according to the present embodiment.

FIG. 4 is a cross-sectional view of a stove burner as another embodiment as seen from a side surface.

FIG. 5 is a cross-sectional view of a conventional table hob viewed from the side.

[Explanation of symbols]

1 ... Table stove, 3 ... stove burner, 5 ... Gotoku, 6
... Burner body, 6a ... Annular mixture chamber, 6b ... Central opening, 7 ... Burner head, 7a ... Flame port groove, 7c ... Cylindrical section, 7
e ... extension cylinder part, 7A ... main flame mouth, 107 ... burner head,
107c ... Cylinder part, 207d ... Cylinder body, P ... Cooking pot.

Claims (4)

[Claims] 1. A burner body having an annular mixture chamber with an opening formed in the center, and a burner head having a large number of flame openings radially on the outer periphery and a cylindrical secondary air passage in the center. In a stove burner in which the secondary air passage of the burner head is fitted in the central opening of the burner body and the burner head is placed on the burner body, the combustion air introduced into the secondary air passage is A stove burner characterized by being provided with a preheating means for preheating the secondary air. 2. The stove burner according to claim 1, wherein the preheating means is a cylindrical extension passage extending downward from a lower end of the secondary air passage formed in the burner head. 3. The burner head is provided with the extension passage,
The stove burner according to claim 2, which is a separate body. 4. The stove burner according to claim 2, wherein the extension passage is integrally formed with the burner head by extending a lower end of the secondary air passage downward.