JPH08327030A - Gas direct fired cooking stove - Google Patents

Abstract

PURPOSE: To provide a gas direct fired cooking stove of preventing scorching of food or incomplete combustion of gas and having excellent thermal efficiency. CONSTITUTION: This gas direct fired cooking stove has a pot 10, the bottom and/or the body of the pot 10 surrounded by a rigid cooking stove body wall A made of a metal to form a combustion chamber R in its inner space, and an exhaust duct B guided from the chamber R via an exhaust duct B, and comprises non-thermal storage heat insulation layers 19, 27 made of a ceramic fiber easy to be heated and cooled and integrally lined on the inner surface of the wall A and duct B. The bottom of the pan 10 and a gas burner 30 opposed to the position directly under the bottom are so spaced at a predetermined distance that the flame of the combustion gas is so decided as not to be brought into direct contact with the bottom of the pan 10 without depriving the radiation heat from the burner 30 to the pan 10 by the layer 19 of the wall A, but to be positively reflected to the pan 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a gas direct-fired stove used for cooking various foods.

[0002]

2. Description of the Related Art In a conventional gas direct-fired furnace, the gas flame rising from a gas burner is set so as to directly hit the bottom surface of the pot. Moreover, the main body wall of the furnace surrounding the bottom surface and the body surface of the pot is formed as a heat storage heat insulating layer such as asbestos, and it is customary to expect high thermal efficiency.

[0003]

However, in the above configuration, since the flame of the gas directly hits the bottom surface of the pan, incomplete combustion is likely to occur, and the bottom surface of the pan or the inner surface of the furnace main body wall is likely to cause. , Soot will be deposited early.

However, even if this is the case, if the gas burner and the bottom of the pan are separated far from each other, the radiative heat transfer is taken away by the heat storage heat insulating layer and stored, so that the bottom of the pan can be efficiently operated. As a result, the thermal efficiency becomes worse, and the gas consumption increases.

Further, since the flame of gas hits the bottom of the pan directly, it is easy to burn the food stored in the pan and it is difficult to cool the heat storage heat insulating layer. Automatic mechanical control is also very difficult.

[0006] In particular, for foods that are required to have properties such as bean paste, it is not allowed not only to cause charring but also to crush the grains. I have no choice but to do.

Further, in the case of a food containing sugar as a raw material, the chemical conversion of the sugar to a reducing sugar determines the deliciousness of the food, but the high heating temperature required for the chemical conversion is required. Can't keep up. This is because it will cover the food and burn the food before it.

Further, although the heat storage heat insulating layer stops the heat of the gas burner, it does not cool down early, so there is a great risk of being burned, and spilled food is burned on the surface of the main body of the furnace and unsightly and soiled. It will also be done.

[0009]

DISCLOSURE OF THE INVENTION The present invention is intended to improve such a problem, and for that purpose, the bottom surface and / or the body surface of the pot is surrounded by a rigid furnace main body wall such as metal, In a gas direct-fired stove in which the internal space is used as a combustion chamber and an exhaust duct is led from the combustion chamber to the outside, non-heat storage heat insulation such as a ceramic fiber that is easy to heat and cool on the furnace main body wall and the inner surface of the exhaust duct. Along with lining the layers together, the bottom of the pot and the gas burner facing directly below it are separated by a certain distance so that the flame of the combustion gas does not directly hit the bottom of the pot, It is characterized in that the radiant heat transfer is positively reflected on the pot without being taken by the heat insulating layer of the furnace main body wall.

[0010]

According to the above construction of the present invention, since the bottom of the pan received by the wall of the furnace main body and the heating gas burner are separated from each other by a certain distance, the food contained in the pan. There is no risk of burning or incomplete combustion of gas.

Even if the gas flame keeps a certain distance so that it does not directly hit the bottom of the pan, the non-heat storage heat insulating layer is lined and integrated with the inner surface of the furnace main body wall. Unlike the heat storage heat insulating layer made of asbestos, it does not absorb and absorb the radiant heat transfer from the gas burner to the pan, but it positively reflects it by the heat insulating layer so that heat transfer by radiation between the gas burner and the pan. Therefore, it is possible to obtain excellent thermal efficiency from the meaning, and it is possible to prevent unnecessary consumption of the gas.

Furthermore, since the heat insulating layer lined with the furnace main body wall and the inner surface of the exhaust duct has a non-heat storage property that is easy to heat and cool, when the heating power of the gas burner is stopped,
The furnace main body wall and the exhaust duct will cool quickly, and as a result, the furnace main body wall and the surface of the exhaust duct can be cleaned cleanly without being burned, and they can be kept as new as ever.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete constitution of the present invention will be described in detail below with reference to the drawings. In FIGS. 1 to 6 showing the gas direct-fired furnace, (A) is a rigid furnace main body wall and a metal plate. (Preferably stainless steel plate) or other refractory material is molded into a substantially inverted U-shaped cross section surrounding the bottom surface and / or the body surface of the pot (10).

Reference numeral (11) is a pan receiving opening formed in the central portion of the upper surface of the furnace main body wall (A). The opening edge is bent and raised as a spill prevention flange (12), so that Through the mutual gap between the main body wall (A) and the pan (10), broth of food or the like is unsightly and does not flow down.

Similarly, (B) is an exhaust duct led out from the upper position of the body surface of the furnace main body wall (A). In the illustrated embodiment, the exhaust duct is continuously projected outward from the furnace main body wall (A). Although it is composed of an assembly of the mouthpiece (13) and a chimney (14) connected in communication therewith, it may of course be embodied as a whole metal tube or the like.

Reference numeral (15) is a support ring integrally and inwardly projected from the lower part of the body surface of the furnace main body wall (A), which is the same as the furnace main body wall (A) from below. A bottom plate (16) of refractory material and a plurality of installation stands (17) are attached and fixed via bolts (not shown) or the like.

However, a gas burner receiving port (18) is provided at the center of the bottom plate (16). If air can be taken into the gas burner described below from the lower surface of the furnace main body wall (A), the installation stand (17) may be omitted.

(19) is a non-heat storage heat insulating layer which is lined and integrated with the inner surface of the furnace main body wall (A) and is easy to heat and cool. It consists of a smashed ceramic fiber.

It is of course possible to lining and integrate this into the furnace main body wall (A) as a thick layer as a whole, but as in the illustrated embodiment, this is an inner heat insulating layer (19a).
And a heat insulating layer (19b), and the inner space surrounded by the inner heat insulating layer (19a) serves as a combustion chamber (R).
It is preferable to divide the space between a) and the outer heat insulating layer (19b) into an exhaust jacket (S) communicating with the exhaust duct (B).

In other words, the outer heat insulating layer (19b) is made relatively soft and thick, and is processed into a band shape from the ceramic fiber, and the inner surface of the furnace main body wall (A) is formed based on the rolled shape. , Stick it on the backing and fix it.

On the other hand, the inner heat insulating layer (19a) is formed as a comparatively hard and thin fired body as shown in FIGS. 4 and 5 by adding a binder to the ceramic fiber and molding it.
After vacuum dehydration of the molded body, it is baked in a drying furnace. And
The inner heat-insulating layer (19a) as the molded / fired body is fitted and integrated with the inner surface of the outer heat-insulating layer (19b) in a relational state in which a constant exhaust jacket (S) is maintained.

In this case, the inner heat-insulating layer (19a) is shaped into a conical or other shape with a lower concavity that substantially corresponds to the bottom surface of the pot (10), so that radiant heat transfer from a gas burner described later can be performed. It is desirable that the lower half of the conical barrel surface (19a-1) directs and reflects the light toward the bottom surface of the pan (10) to improve the thermal efficiency of the gas.

(20) is a large number of exhaust holes distributed in the upper surface of the cylindrical body surface (19a-2) of the inner heat insulating layer (19a), and has substantially the same bore diameter. In particular, as indicated by the development of FIG. 6, the distribution of the openings is shown as a rough pitch (P1) in the vicinity of the position corresponding to the exhaust duct (B), and as the distance from the exhaust duct (B) increases, the pitch becomes finer. As (P2), the difference is sequentially changed.

By this, the effective combustion gas acting on the pan (10) is prevented from being drawn out into the exhaust duct (B) quickly, and the thermal efficiency of the gas is improved. In that sense, as is clear from the modified example of FIG. 7 corresponding to FIG. 6, while the distribution state of the exhaust holes (20) is made uniform overall, a small diameter is provided near the position corresponding to the exhaust duct (B). As (D1), the diameter (D2) may be gradually increased with increasing distance from the exhaust duct (B), and may be sequentially changed differently, or may be used in combination with the configuration of FIG.

(21) is a sleeve receiving notch similarly provided in the conical barrel surface (19a-1) of the inner heat insulating layer (19a), and (22) is positioned so as to correspond to this, so that the furnace body wall (A) is located. And the outer heat insulation layer (19b), which is a peephole formed through the outer heat insulation layer (19b). The peephole (22) and the sleeve receiving notch (21) are also made of a non-heat storage heat insulating material such as a ceramic fiber. The viewing window sleeve (23) is inserted and fixed. It is possible to visually check the combustion status of gas from the outside.

(24) is the bottom plate (1) of the furnace main body wall (A)
6) A heat insulating mat integrally lined from the inner side (upper side) to this, which is also made of a non-heat storage heat insulating material such as a ceramic fiber, and which has the inner and outer heat insulating layers (19a) (19a).
Together with b), the exhaust jacket (S) is airtightly enclosed.

However, since the exhaust gas rises by itself due to high temperature, a large number of intake holes (outside air intake holes) (25) are distributed in the bottom plate (16) and the heat insulating mat (24).
By omitting these installations, the lower surface of the furnace main body wall (A) may be fully opened. In a similar manner, an intake hole (26) as suggested in FIG. 1 can be formed on the bottom surface of the mouthpiece (13) facing the position directly below the chimney (14).

(27) is the base (13) and chimney (1)
4) A non-heat storage heat insulating layer backed and integrated with the inner surface of the exhaust duct (B) communicating with 4), which is also made of ceramic fiber or the like, and the heat insulating layer (27) and the chimney (14) part A uniform adiabatic air layer (2
8) is also secured. (29) is the top cover of the heat insulation air layer (28).

Reference numeral (30) is a gas burner facing the gas burner receiving port (18), and it goes without saying that the gas burner is installed directly below the pot (10), but especially the pot (10) and the gas burner (30). Are separated from each other by a certain distance (H) so that the flame of the combustion gas does not directly hit the bottom surface of the pan (10).

For that constant distance (H), it is preferable to dimension it about 2-3 times the height of the flame. That is, the temperature at the tip of the flame is usually about 1600 ° C., and in the past, the distance between the tip and the bottom of the pan (10) was about 10 mm, and the bottom of the flame was substantially hit by a gas flame. On the other hand, in the case of the present invention, the interval is set to about 80 mm, and the setting is made so that the bottom surface of the pot (10) can be heated to about 700 to 1000 ° C. The gas supply line to the gas burner (30) is not shown.

According to this structure, it is possible to prevent the burning of the food to be heated and the incomplete combustion of the gas. Even if the food is separated by a certain distance (H), the inner surface of the furnace main body wall (A). Insulation layer (1
9) has a non-heat storage property that heats easily and cools easily.
The heat insulation layer (19) does not absorb and absorb the radiant heat transferred from the gas burner (30) to the pan (10), but rather, positively reflect it so as to direct it toward the pan (10) and obtain its high thermal efficiency. Can be done.

Further, the inner surface of the furnace main body wall (A) is lined with a non-heat storage heat insulating layer (19),
The gas burner (3) is also lined on the inner surface of the exhaust duct (B) with a non-heat storage heat insulating layer (27).
When the heating power of 0) is stopped, even if it touches the surface of the furnace main body wall (A) or the exhaust duct (B), there is no danger of being burned, which is extremely useful for cleaning the surface.

[0033]

As described above, according to the present invention, the bottom surface and / or the body surface of the pot (10) is surrounded by the rigid furnace main body wall (A) such as metal, and the internal space thereof is set in the combustion chamber (R). In a gas direct-fired stove in which an exhaust duct (B) is led from the combustion chamber (R) to the outside, a ceramic fiber hood that is easy to heat and cool on the inner surfaces of the furnace main body wall (A) and the exhaust duct (B). Non-heat storage heat insulation layer (1
9) (27) is lined and integrated, and the above pan (1
Gas burner (30) facing the bottom of 0) and the position just below it
Are separated from each other by a certain distance (H) at which the flame of the combustion gas does not directly hit the bottom of the pan (10), and the radiative heat transfer from the gas burner (30) to the pan (10) is transferred to the main body wall of the furnace. Since it is determined that the pot (10) is positively reflected without being taken by the heat insulating layer (19) of (A), there is an effect that the problem of the prior art described at the beginning can be completely solved. .

That is, according to the above configuration of the present invention, a flame of combustion gas is generated between the bottom surface of the pan (10) received by the furnace main body wall (A) and the heating gas burner (30). Since the pan (10) is separated by a certain distance (H) that does not directly hit the bottom, there is no risk of burning food in the pan (10) or causing incomplete combustion of gas.

Assuming that the combustion gas flame keeps a certain distance (H) that does not directly hit the bottom of the pan (10), the inner surface of the furnace main body wall (A) has a non-heat storage heat insulating material such as ceramic fiber. Since the layer (19) is lined and integrated, unlike the conventional heat storage heat insulating layer made of asbestos, the radiant heat transfer from the gas burner (30) to the pot (10) is not absorbed and absorbed, which is The gas burner (3
It is possible to accelerate the heat transfer due to the radiation between 0) and the pan (10), and in that sense, it is possible to obtain excellent thermal efficiency and prevent the gas from being consumed unnecessarily.

Moreover, the heat insulating layers (19) and (27), which are lined and integrated not only on the inner surface of the furnace main body wall (A) but also on the inner surface of the exhaust duct (B), have a non-heat storage property that is easy to heat and cool. Therefore, when the heating power of the gas burner (30) is stopped, the furnace main body wall (A) and the exhaust duct (B) are also quickly cooled, and as a result, the main body wall (A) and the exhaust wall (A) are not burned. The surface of the exhaust duct (B) can be cleaned beautifully, and it has the effect of keeping it as new as it is.

Particularly, according to the structure of claim 2, since the non-heat storage inner heat insulating layer (19a) is shaped into a conical shape or other corresponding shape conforming to the bottom surface of the pot (10), The radiant heat transfer reflected by the heat insulation layer (19a) is transferred to the pan (1
It can be directed to the bottom of 0) without loss, and the amount of radiant heat transfer from the gas burner (30) can be used more efficiently for cooking food. In order to achieve this effect, a large number of exhaust holes (20) are formed on the body surface of the inner heat insulating layer (19a) in the vicinity of the position corresponding to the exhaust duct (B), and the rough pitch (P1) is used, and the exhaust duct ( B)
It can be said that the finer the pitch (P2) is, the smaller the distance from the opening is.

The above effects can be achieved substantially equivalently even if the structure described in claim 3 is adopted, and it can be said that the invention is extremely useful.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a gas direct-fired stove according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view showing a chimney portion of an exhaust duct in an extracted manner.

FIG. 4 is a plan view showing an inner heat insulating layer of the furnace main body wall extracted.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is a side view showing a developed state of an inner heat insulating layer.

FIG. 7 is a side view showing a developed state of a modified example corresponding to FIG.

[Explanation of symbols]

 (10) -Pot (19) -Non-heat storage heat insulation layer (19a) -Inner heat insulation layer (19b) -Outside heat insulation layer (20) -Exhaust hole (27) -Non-heat storage heat insulation layer (30) -Gas burner ( A) · Furnace body wall (B) · Exhaust duct (H) · Fixed distance (R) · Combustion chamber (S) · Exhaust jacket

Claims (3)

[Claims] 1. A bottom or / and a body surface of a pot (10) is surrounded by a rigid furnace main body wall (A) made of metal or the like, and an internal space thereof is defined as a combustion chamber (R), and the combustion chamber (R). In the gas direct-fired stove in which the exhaust duct (B) is led from the outside to the outside, on the inner surface of the furnace main body wall (A) and the exhaust duct (B),
A heat-insulating heat insulating layer (19) (27) such as a ceramic fiber that is easy to heat and cool is lined and integrated, and the bottom surface of the pot (10) and a gas burner (30) facing directly below the pan (10) are used as combustion gas. The flame of is separated from the bottom of the pan (10) by a certain distance (H), and the radiant heat transfer from the gas burner (30) to the pan (10) is prevented by the heat insulation of the furnace body wall (A). A direct-fired gas stove characterized in that the pan (10) is positively reflected without being taken by the layer (19). 2. A non-heat storage heat insulating layer (1) of a furnace main body wall (A)
9) is formed into a double structure composed of an inner heat insulating layer (19a) and an outer heat insulating layer (19b), and the inner heat insulating layer (19a) is formed.
The internal space surrounded by is defined as a combustion chamber (R), while the inner heat insulating layer (19a) and the outer heat insulating layer (19b) are also classified as an exhaust jacket (S) communicating with the exhaust duct (B). Then, the inner heat insulating layer (19a) is formed into a shape substantially corresponding to the bottom surface of the pan (10), and a large number of exhaust holes (2
0) is a rough pitch (P1) near the position corresponding to the exhaust duct (B), and the openings are distributed as fine pitch (P2) as it goes away from the exhaust duct (B). Gas open flame furnace. 3. A non-heat storage heat insulating layer (1) for a furnace main body wall (A).
9) is formed into a double structure composed of an inner heat insulating layer (19a) and an outer heat insulating layer (19b), and the inner heat insulating layer (19a) is formed.
The internal space surrounded by is defined as a combustion chamber (R), while the inner heat insulating layer (19a) and the outer heat insulating layer (19b) are also classified as an exhaust jacket (S) communicating with the exhaust duct (B). Then, the inner heat insulating layer (19a) is formed into a shape substantially corresponding to the bottom surface of the pan (10), and a large number of exhaust holes (2
0) has a small diameter (D1) near the position corresponding to the exhaust duct (B), and has a larger diameter (D2) as the distance from the exhaust duct (B) increases. Gas open flame furnace.