JPH02174811A - Gas rice cooker of three-dimensionally heating type - Google Patents

Abstract

PURPOSE:To improve its heat efficiency by providing a small exhausting port which is over the center of a cooking vessel and it opened to an exhausting duct, and by providing a fan by which combustion gas is forcibly led to the exhausting port. CONSTITUTION:A small exhausting port 18a is formed at the central part of top plate 18 which is over a lid part 4 of a cooking vessel 3. A title cooker is so composed that the combustion gas in a rice cooking box 2 is discharged to an exhausting duct 19 through this exhausting port 18a. A clearance between the top plate 18 and the upper surface of the lid part 4 is also made very narrow; and a clearance between the bottom of the cooking vessel 3 and a reflecting plate 17 is also made narrow. After the secondary air led into a heat-insulating sleeve 13 passes through a narrow clearance under the bottom of the cooking vessel 3 together with combustion gas from a burner heat 15, it rises along the wall surface of the cooking vessel 3. After that, it passes through a narrow clearance over the lid part 4 of the cooking vessel 3, and is forcibly sucked through the small exhausting port 18a and finally discharged to an exhaust duct 19. Since the combustion gas is forcibly circulated by a fan 23, it is well circulated in the rice cooking box 2. It is thus possible to improve its heat efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a three-dimensional gas rice cooker having two or more rice cooking chambers formed in the vertical direction.

(Prior Art and its Problems) Conventionally, a three-dimensional gas rice cooker has a structure as shown, for example, in a front sectional view in FIG. 3 and in a side sectional view in FIG. 4.

That is, in the three-dimensional gas rice cooker 1, two or more rice cooking chambers 2.2 are formed in the vertical direction, and a rice cooking pot 3 is disposed in each rice cooking chamber 2.2. The upper surface of the pot 3 is a lid part 4, 4 having a handle 4a.

Each of the rice cooking pots 3, 3 has a handle 88 of an opening/closing door 8 provided on the front wall 7 via a hinge 8b so as to be openable/closable, and can be accessed from the front side by opening the opening/closing door 8.

Moreover, the upper part of each rice cooking chamber 2.degree. 2 is a clay wall section 6 with a heat insulating material inside, and the side walls have side wall sections 5, 5 with a heat insulating material inside. Furthermore, the back side is a rear wall portion 9 with a heat insulating material inside. Incidentally, a heat insulating material is also provided inside the opening/closing door 8.

A gutter-shaped bottom plate 11 is disposed laterally in the lower part of the rice cooking pot 3 in each rice cooking chamber 2 surrounded by a heat insulating material. A cylindrical heat shield @13 is installed on the top side, and the heat shield i
A heat insulating material 13a is adhered to the inside of 13. Furthermore, a heat sensitive section 14 composed of a thermistor or the like is disposed within the heat shield cylinder 13, and this F! ! The heating part 14 is in contact with the bottom of the rice cooker 3 and can sense the temperature of the rice cooker 3. Further, a burner head 15 is disposed on the outer periphery (II) of the heat shield n13, and gas serving as fuel is supplied to the burner head 15 from the outside via a gas path 16.

Further, a reflecting plate 17.17 is disposed horizontally below the rice cooking pot 3 and on the side of the burner head 15. The lower part of this reflecting plate 17 is an air chamber 12, and this air chamber 12 has a secondary air hole 1 that opens to the outside air.
0.10 is opened through the (II wall 5), and a secondary air hole 10 is also formed in the front wall 7 to communicate with this air chamber 12.

Further, a top plate 18 is disposed above the lid 4 of the rice cooker 3, and an exhaust port 18a is opened in the top plate 18, and the exhaust port 18a is recessed in the top wall 6. It communicates with the formed exhaust path 19. An exhaust cover 20 is installed at the downstream end of the exhaust passage 19, and the combustion gas is exhausted to the outside through this exhaust cover 20.

In such a structure, when the rad 15 is ignited to the burner, the combustion gas flows into the rice cooker 3 as shown by arrow A.
The gas passes through the periphery of the lid portion 4, passes through the upper surface side of the lid portion 4, and flows out into the exhaust path 19 from the exhaust port 18a. At this time, the air introduced into the air chamber 12 from the secondary air hole 10.10 is transferred to the heat shield tube 1.
3, and as shown by arrow B, the combustion gas passes through the periphery of the rice cooker 3 and flows out to the exhaust port 18a.

The rice in the rice cooker pot 3 is cooked in this way,
In such a conventional structure, the combustion gas is naturally exhausted together with the secondary air, so the secondary air hole 10
It is necessary to introduce a large amount of air into the cooking chamber 2, and it is also necessary to use this cold air to cool the heat-sensing section 14 so that the heat-sensing section does not operate prematurely due to the heat of the burner head 15. There was a problem in that the thermal efficiency was worse than when air was introduced.

(Means for Solving the Problems) The present invention has been devised in view of the above-mentioned conventional problems, and its first purpose is to provide a gas rice cooker that can significantly improve thermal efficiency. The gist is that each rice cooking chamber, which is formed at least two in the vertical direction and accommodates a rice cooking pot so that they can be taken in and out, has a burner below the rice cooking pot, a secondary air passage that introduces secondary air into the rice cooking chamber, and a secondary air passage that introduces secondary air into the rice cooking chamber. A heat-sensitive part that detects the temperature of the rice cooker and controls the burner is disposed, an exhaust passage for exhausting combustion gas is formed above the rice cooker, and the exhaust passage is located above the center of the rice cooker. A narrow exhaust port is formed that opens into the air.

The second gist is that a fan is provided in the exhaust passage or the secondary air passage for forcibly guiding the combustion gas to the υF air 1-1.

Moreover, the third gist is that one end of the secondary air passage is opened to the outside air at one location, and the other end is opened around the heat-sensitive section.

The fourth aspect is that the gap between the bottom surface of the rice cooker and the burner and the gap between the top surface of the rice cooker and the exhaust port are formed to be narrow.

(Function) An exhaust port with a narrow opening is formed at the upper center of the rice cooker in each rice cooking chamber, so that the combustion gas flowing around the rice cooker in the rice cooking chamber can be efficiently circulated at the upper center of the rice cooker. The rice-cooking pot is surrounded by combustion gas in the rice-cooking chamber, which greatly improves thermal efficiency.

Further, in the second aspect, since a fan is provided in the exhaust passage or the secondary air passage, when this fan is operated, the combustion gas is sucked into the exhaust passage side by the fan, and the combustion gas is The combustion gas is forcibly guided to the exhaust port, which improves the circulation of combustion gas within the cooking chamber and improves thermal efficiency. or,
When a fan is provided in the secondary air passage, secondary air is forced into the combustion chamber, resulting in good circulation of combustion gas. In addition, by providing the fan, the intake port for secondary air can be narrowed, and the amount of secondary air introduced into the rice cooking chamber can be reduced.

In addition, in the third aspect, the amount of secondary air introduced into the rice cooking chamber is reduced by opening the secondary air passage to the outside air at only one location and opening the other end around the heat sensitive part. Thermal efficiency in the rice cooking chamber can be improved, and the heat-sensing part can be cooled down by bringing cold secondary air into contact with the periphery of the heat-sensing part.

In addition, in the fourth aspect, by forming the gap between the bottom surface of the rice cooker and the burner and the gap between the top surface of the rice cooker and the exhaust port to be narrow, the combustion gas is narrowed on the bottom and top sides of the rice cooker. Since the gas is circulated through the gaps, it is possible to heat the entire circumference of the rice cooker well, and the height of the entire rice cooking chamber can be reduced compared to conventional ones, making it possible to heat the entire circumference of the rice cooker. The overall height can be made low.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

Fig. 1 shows a front sectional view of the main part of the three-dimensional gas rice cooker of this example, and Fig. 2 shows a side sectional view of the main part of Fig. 1. Identical members are given the same reference numerals and their descriptions will be omitted.

In this example, a narrow exhaust port 18a is formed in the top plate 18 above the center of the top side of the lid 4 of the rice cooking pot 3, and the combustion gas in the rice cooking chamber 2 is exhausted through this exhaust port 18a. Road 1
Further, the gap between the top plate 18 and the upper surface of the lid portion 4 is formed to be extremely narrow.

Furthermore, the gap between the bottom surface of the rice cooker 3 and the reflective plate 17 is also narrower than that of the conventional one.

Further, in this example, no heat insulating material is provided on the inner periphery of the heat shield tube 13 disposed around the heat sensitive section 14, and the secondary air passage 21 is communicated with the lower part of the heat shield tube 13. It is formed in a state that The other end of the secondary air passage 21 is opened at one location in the side wall portion 5, and has a structure in which outside air can be introduced from one location. Further, a fan 23 that can be rotated by a motor 22 is disposed inside the exhaust cover 20 at the downstream end of the exhaust passage 19. When the fan 23 is rotated, combustion gas is forced into the exhaust passage 19. It has a structure that can be pulled out.

In such a structure, secondary air flows into the secondary air passage 21 from one intake port and is introduced into the heat shield n13, so that the heat-sensitive section 14 is heated by the introduced cold secondary air. When the rice is cooled well, the heat sensitive part 14 becomes high temperature early due to the heat of the burner head 15, and the combustion of the burner -15 is not interrupted, and the rice cooking pot 3 becomes high temperature and the rice cooks well until a good cooking condition is obtained. The burner head 15 can be fired. In addition, the secondary air introduced into the heat shield cylinder 13 passes through a narrow gap on the bottom side of the rice cooker 3 together with the combustion gas from the burner head 15 and rises along the wall surface of the rice cooker 3, and further rises along the wall of the rice cooker 3. It passes through a narrow gap on the upper surface side of the lid part 4, is forcibly pulled out from the narrow exhaust port 18a, and flows out into the exhaust passage 19. Therefore, the combustion gas can properly heat the periphery of the rice cooker 3 in the process of flowing out along the bottom surface of the rice cooker 3 and along the top side of the lid part 4, and the exhaust port 18a is narrow. Because of its size, the combustion gas is completely guided to the center of the lid 4, heating the lid 4 well, and strongly heating the rice in the rice cooker 3 from the top side. You can cook rice on all sides of 3. In addition, in this example, the rice cooking chamber 2
Since the amount of secondary air introduced into the rice cooking chamber 2 is smaller than before, the inside of the rice cooking chamber 2 is less likely to be cooled by this air, and the thermal efficiency is greatly improved, as described above. Since the peripheral surface of the pot 3 is well heated by the combustion gas, thermal efficiency is further improved.

In addition, in this example, the combustion gas is not naturally circulated but is forcedly circulated by the fan 23, so the circulation of the combustion gas in the rice cooking chamber 2 is extremely good, and the thermal efficiency can be further improved. It is something. Moreover, by stopping the fan 23 at the final stage, the convection circulation of the combustion gas in the rice cooking chamber 2 is stopped, and the combustion gas exerts a steaming effect in the combustion chamber 2, and this steaming effect makes the rice delicious. It is possible to raise it. As described above, since the gaps above and below the rice cooker 3 are narrowed, the height inside the rice cooking chamber can be reduced, and the overall height of the gas rice cooker 1 can be reduced. This also has the effect of making it easier to put in and take out the rice cooking pot 3 during rice cooking.

In this example, although the fan 23 is installed on the exhaust path 19 side, a fan is installed in the secondary air path 21 to forcefully push combustion inside the combustion chamber 2. A method of causing gas to convect may also be used.

(Effects of the Invention) The three-dimensional gas rice cooker of the present invention has two or more vertically arranged rice cooking chambers each housing a rice cooking pot so as to be able to be taken in and out. A secondary air passage for introducing secondary air into the rice cooker, a heat sensitive part for detecting the temperature of the rice cooker and controlling the burner are arranged, and an exhaust passage for exhausting combustion gas is formed above the rice cooker. In addition, by forming a narrow exhaust port that opens into the exhaust passage at the upper center of the rice cooking pot, the combustion gas in the rice cooking chamber completely covers the periphery of the rice cooking pot, especially the top side. Since the rice is circulated quickly, it has the effect of heating the rice cooker well and improving thermal efficiency.

Further, by providing a fan in the exhaust passage or the secondary air passage to forcefully guide the combustion gas to the exhaust port, the combustion gas can be circulated well in the cooking chamber to improve thermal efficiency. can. By opening one end of the secondary air passage to the outside air and opening the other end around the heat-sensitive part, the amount of air introduced into the cooking chamber is reduced, and thermal efficiency is improved accordingly. At the same time, the heat-sensitive part can be cooled well by the introduced cold outside air, and an increase in overheating of the heat-sensitive part can be well suppressed, and the rice cooking pot can be maintained at a high temperature. Furthermore, by forming the gap between the bottom surface of the rice cooker and the burner and the gap between the top surface of the rice cooker and the exhaust port to be narrow, combustion gas passes through the narrow gap and heats the rice cooker well. Thermal efficiency can be improved satisfactorily. Furthermore, since the gap is narrow, the height of the rice cooker as a whole can be reduced, which also has the effect of making it easier to put in and take out the rice cooker.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of the main part 1 of the three-dimensional gas rice cooker of the present invention, Fig. 2 is a side sectional view of the main part of Fig. 1, and Fig. 3 corresponds to Fig. 1 showing the conventional structure. FIG. 4 is a front sectional view of the main part, and FIG. 4 is a side sectional view of the main part of FIG. 1...3D gas rice cooker 2...Rice cooking chamber 3...
・Rice cooking pot 4...Lid part 8...Opening/closing door 13...Heat shield tube 14...Heat sensitive part 15...Burner head 17...Reflector plate 18・
...Top plate 18a...Exhaust port 19...
Exhaust path 21... Secondary air path 23... Fan patent applicant Comet Kato Co., Ltd. Agent Patent attorney Yoshihisa Shimizu 1... Three-dimensional gas rice cooker 3... Rice cooker 8... Opening/closing Door 14...Heat sensitive part 15...Burner head 18...Top plate 19...Exhaust passage 23...Fan 2...Rice cooking chamber 4...Lid part 13...Heat shield cylinder 17 ...Reflector plate 18...Exhaust port 21...Secondary air path procedural amendment (voluntary) 1゜2゜3゜4゜Indication of incident 1985 Patent Application No. 329900 Name of invention Three-dimensional type Relationship with the gas rice cooker amendment case Patent applicant address: 9-109 Nishihiki-cho, Nakagawa-ku, Nagoya Comet Kato Co., Ltd. Name: Representative Kagenori Kato

Claims (4)

[Claims] (1) Each rice cooking chamber, which is formed in two or more vertical directions and accommodates a rice cooking pot so that they can be taken in and out, has a burner below the rice cooking pot, and a secondary air passage that introduces secondary air into the rice cooking chamber;
A heat-sensitive part that detects the temperature of the rice cooker and controls the burner is disposed, and an exhaust passage for exhausting combustion gas is formed above the rice cooker, and the exhaust passage is located above the center of the rice cooker. A three-dimensional gas rice cooker characterized by being formed with a narrow exhaust port that opens into a passageway. (2) The three-dimensional gas rice cooker according to claim 1, further comprising a fan provided in the exhaust passage or the secondary air passage for forcibly guiding combustion gas to the exhaust port. (3) opening one end of the secondary air passage to the outside air,
The three-dimensional gas rice cooker according to claim 1 or claim 2, wherein the other end is opened around the heat-sensitive portion. (4) A gap between the lower surface of the rice cooker and the burner and a gap between the upper surface of the rice cooker and the exhaust port are formed to be narrow spaces.
A three-dimensional gas rice cooker according to claim 3 or claim 3.