JPH09243087A - Flame leakage preventive type cooking stove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heating efficiency in a cooking stove in which the leakage of a flame or hot air to the outside of a grate is restrained by providing a cylindrical grate for surrounding the flame of a burner, and an exhaust fan for forcibly sucking and exhausting the hot air generated by the flame from the space surrounded by the grate. SOLUTION: A burner 5 is formed of an inside flame type ring burner, and an annular overhanging member 42 overhanging radially inward from a grate 3 is provided between the grate 3 and the burner 5. The flame F of the burner 5 rises via the opening 42b of the inner periphery of the member 42, and the flame F and hot air flow radially outward in the upper space of the member 42 by the suction force of an exhaust fan 7. A protrusion 42c for disturbing the rectilinear propagation of the flame and hot air radially outward is provided on the upper surface of the member 42 to increase the contact time of the flame and hot air with the bottom of a pan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame leakage prevention type stove capable of suppressing the leakage of flame and hot air to the outside of Gotoku.

[0002]

2. Description of the Related Art A conventional stove uses Gotoku with a nail,
The burner's flame and the heat generated by the flame are naturally released to the outside of Gokutoku along the bottom of the pot placed on the claws of Gokutoku. Reaches the handle of the pot and heats it, causing a problem that the handle becomes difficult to hold.

In order to solve such a problem, the Gotoku is formed into a cylindrical shape to surround the flame of the burner, and an exhaust fan for forcibly sucking and exhausting the hot air generated by the flame from the space surrounded by the Gotoku is provided, A flame leakage prevention type stove that is capable of suppressing the leakage of flame and hot air to the outside of Gotoku is considered.

[0004]

In the flame leak prevention type stove as described above, heating of the handle of the pan can be prevented, but the proportion of hot air sucked and exhausted without contacting the bottom of the pan increases and the heating efficiency decreases. There is a problem that you will win. In view of the above points, an object of the present invention is to provide a flame leakage prevention type stove capable of improving heating efficiency.

[0005]

Means for Solving the Problems In order to solve the above problems,
The present invention is a flame leak prevention type stove including a tubular Gotoku that surrounds a burner flame, and an exhaust fan that forcibly sucks and exhausts hot air generated by the flame from a space surrounded by the Gotoku,
The burner is composed of an internal flame type ring burner having flame holes on the inner circumference, and an annular projecting member that projects radially inward from Gotoku is provided between the Gotoku and the burner, and the burner flame overhang member. It rises through the opening on the inner periphery of the fan, and the flame and hot air flow radially outward in the space above the overhanging member due to the suction force of the exhaust fan.

According to the present invention, the flame rising from the opening on the inner circumference of the overhang member comes into contact with the central portion of the pot bottom, and flows radially outward while contacting the pot bottom in the space above the overhang member. Thus, the flame and hot air come into contact with the bottom of the pot over a wide range from the center to the periphery, and the heating efficiency is improved.

In this case, if a protrusion is provided on the upper surface of the overhanging member to prevent the flame and hot air from going straight outward in the radial direction in the space above the overhanging member, the contact time of the flame and hot air with the bottom of the pot is lengthened. Further, by providing the protrusion, the surface area of the upper surface of the overhanging member, that is, the radiation area to the bottom of the pot increases, and the heating of the bottom of the pot by the radiant heat from the overhanging member is also promoted, further improving the heating efficiency.

Further, in order to accelerate heating by radiant heat from the overhanging member, the overhanging member is formed in a double-wall structure so that the upper surface of the overhanging member is not cooled by the secondary air flowing along the lower surface of the overhanging member. Is desirable.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIG. 1, a stove body 1 has an opening 2 formed in a top plate 2 on an upper surface of the stove body 1.
The Gotoku 3 was placed on the upper surface of the peripheral portion of a, the combustion casing 4 extending below the opening 2a was provided, and the burner 5 was housed in the combustion casing 4.

The burner 5 is composed of an internal flame type ring burner having a flame hole 5a on the inner periphery thereof, and has a bottomed cylindrical support frame 41 which is inserted into the combustion casing 4 with a peripheral void 40. The burner 5 was fitted on the upper end of the. An annular projecting member 42 that projects radially inward of the Gotoku 3 is provided at the upper end of the combustion casing 4, and is connected to the gap 40 between the upper surface of the burner 5 and the lower surface of the projecting member 42. The secondary air passage 40a is formed so that the secondary air for combustion can be introduced into the combustion casing 4 through the passage 40a and the secondary air hole 41a formed in the bottom plate portion of the support frame 41. In the illustrated example, the overhang member 42
Although it is integrated with the combustion casing 4, a separate overhang member 42 may be attached to the upper end of the combustion casing 4.

Further, the heat shield cylinder 43 is inserted into the opening 41b formed in the center of the bottom plate portion of the support frame 41, and the heat sensitive head 44 which is biased upward by a spring (not shown) is provided in the heat shield cylinder 43. ,
When the pan P was placed on Gotoku 3, the thermal head 44 was pressed against the bottom of the pan, and when overheating of the pan bottom occurred, this was detected by the thermal head 44 and the burner 5 was extinguished. 5 in the figure
Reference numeral b is a spark plug for the burner 5.

The Gotoku 3 is formed in a cylindrical shape having an inner and outer double wall structure surrounding the flame F of the burner 5. Also, the combustion casing 4
The surrounding wall portion and the overhanging member 42 have a double wall structure, and the space between the double walls is configured as an exhaust passage 6 that communicates with an exhaust port 6a opened at the back of the top plate 2 through an exhaust fan 7. There is. Then, the exhaust window 30 is opened in the inner peripheral wall of the Gotoku 3, and the communication hole 42a that connects the hollow space of the Gotoku 3 and the exhaust passage 6 is opened in the upper wall of the overhanging member 42, and the hot air generated by the flame F is generated. When the exhaust fan 7 is operated, it is forcibly sucked and exhausted to the exhaust port 6a through the exhaust window 30, the hollow space of the Gotoku 3, the communication hole 42a, and the exhaust passage 6. Thus, when the pot P is placed on Gotoku 3, the heat is 5
It is possible to prevent the handle PH of the pan P from being heated by hot air without leaking to the outside.

Also, the flame F of the burner 5 is
Rises through the central opening 42b to contact the substantially central portion of the bottom of the pot, and contacts the bottom of the pot in the space above the overhanging member 42 while flowing radially outward toward the exhaust window 30. Thus, the flame F and hot air come into contact with the bottom of the pot over a wide range from the central portion to the peripheral portion, and the heating efficiency is improved. In the present embodiment, the overhang member 42 is extended inward of the flame hole 5a of the burner 5 so that the flame F can be laid inward in the vicinity of the burner 5 by the air from the secondary air passage 40a. Therefore, the flame F rises in the innermost position as much as possible and the contact area with the bottom of the pan increases.

The upper surface of the overhang member 42 is shown in FIGS.
As shown in, a large number of protrusions 42c are formed. Therefore, the flow of the flame F or the hot air is disturbed by the protrusions 42c, the flame F or the hot air does not go straight outward in the radial direction, the contact time of the flame F or the hot air with the bottom of the pot becomes longer, and the upper surface of the overhanging member 42 is The surface area, that is, the radiation area to the bottom of the pot is increased, the heating of the bottom of the pot by the radiant heat from the overhanging member 42 is promoted, and the heating efficiency is further improved.

In the above embodiment, the projection 42c is provided so as to disturb the flow of the flame F or the hot air. However, the fin-like projections 42d and 42e as shown in FIG. 3 and FIG. A turning vector in the circumferential direction may be given to the flow of. Also in this case, the flame F and the hot air do not go straight outward in the radial direction, and the contact time of the flame F and the hot air with the bottom of the pot increases.

Further, in the above embodiment, hot air is sucked and discharged through the exhaust window 30 provided on the inner peripheral wall of the Gotoku 3, but it is located on the upper wall of the overhanging member 42 near the inner peripheral surface of the Gotoku 3. It is also possible to open an exhaust window so that hot air is sucked and exhausted from this exhaust window.

It is also possible to form the overhanging member 42 into a plate shape instead of the double wall structure. In this case, the overhanging member 42 is cooled by the air flowing through the secondary air passage 40a, It becomes impossible to effectively perform heating by the radiant heat from the overhanging member 42. In contrast,
If the overhanging member 42 is formed in the upper and lower double wall structure as in the above embodiment, even if the lower wall facing the secondary air passage 40a is cooled, the upper wall is hardly cooled and the upper wall is hardly cooled. The heat radiation from the wall is effectively performed.

[Brief description of drawings]

FIG. 1 is a cutaway side view of an example of a stove according to the present invention.

FIG. 2 is a plan view cut along the line II-II of FIG. 1;

FIG. 3 is a cutaway plan view corresponding to FIG. 2 of the second embodiment.

FIG. 4 is a cutaway plan view corresponding to FIG. 2 of the third embodiment.

[Explanation of symbols]

3 Gotoku 5 Burner 7 Exhaust Fan 42 Overhanging Member 42b Opening 42c, 42d, 42e
Protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kohei Kobayashi 3-28-70-810 Minamisenju, Arakawa-ku, Tokyo (72) Masao Aramatsu 2-26, Fukuzumi-cho, Nakagawa-ku, Aichi Prefecture Nagoya, Japan In-house (72) Inventor Masaaki Nakaura 2-26 Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Linnai Co., Ltd. (72) In-house Hideaki Ishikawa 2-26 Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Rinnai Co., Ltd. Within

Claims (3)

[Claims] 1. A flame leak prevention type stove comprising: a tubular Gotoku enclosing a flame of a burner; and an exhaust fan for forcibly sucking and exhausting hot air generated by the flame from a space surrounded by the Gotoku. It is composed of an internal flame type ring burner with flame holes in the inner circumference, and an annular projecting member that projects radially inward from Gotoku is provided between Gotoku and the burner. A flame leakage prevention type stove characterized in that the flame and hot air flow upward in the space above the projecting member in the radial direction by the suction force of the exhaust fan. 2. The flame leakage prevention type stove according to claim 1, wherein a protrusion is provided on the upper surface of the overhanging member to prevent the flame and hot air in the space above the overhanging member from going straight outward in the radial direction. . 3. The flame leakage prevention type stove according to claim 1, wherein the overhanging member is formed in an upper and lower double wall structure.