JPH0534603Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application and overview of the invention] The present invention relates to a heat-retaining gas rice cooker, particularly a heat-retaining gas rice cooker in which the rice cooker is surrounded by a heat-insulating heat-retaining layer. By forcing the gas burner to burn, the gap in the exhaust passage provided around the outer periphery of the rice cooker can be reduced, improving heat retention efficiency and making the entire rice cooker smaller.

[Prior art and its problems] As a gas rice cooker in which the outer periphery of the rice cooker is surrounded by a heat-retaining layer filled with a heat insulating material,
There is a device disclosed in Japanese Patent No. 16360, which has a structure in which, as shown in FIG. The space between the rice cooker pot 20 in the case 2 and the rice cooker 20 is divided by the partition tube 3, and the ascending exhaust passage 31 and the descending exhaust passage 32 are arranged side by side, and the outer peripheral wall of the descending exhaust passage 32 located on the outer peripheral side is covered with a heat insulating material. The cylindrical heat-retaining layer 21 is filled with .

In this case, the gas burner B is combusted by the air flowing in from the bottom of the lower case 1, and the combustion exhaust gas rises through the ascending exhaust passage 31, during which time the rice cooker 20 is heated, and then the rising exhaust gas rises. descends down the descending exhaust passage 32 and enters the exhaust opening 3 at the lower end.
It is discharged from 3.

In addition, after cooking rice, the rice cooker 20 is heated by the heat insulating layer 21.
Furthermore, the upper end flange of the rice cooker 20 containing cooked rice causes the rising exhaust passage 3 to be surrounded.
1 is closed, the heat insulating layer 21 provides insulation and heat retention, and the descending exhaust passage 32 is less likely to have a ventilation flow due to draft action, improving heat retention efficiency.

However, in the case of the above-mentioned exhaust system, although the fact that draft action is less likely to occur in the descending exhaust passage 32 is effective for keeping warm, this is a disadvantage when it comes to smooth combustion of the gas burner B.

Since draft action is difficult to occur, combustion exhaust gas is not discharged smoothly, and poor combustion is likely to occur. Therefore, in the above conventional method,
In order to ensure sufficient combustion performance, it is necessary to make the cross-sectional area of the ascending exhaust passage 31 and the descending exhaust passage 32 sufficiently large, and in this case, on the contrary, the heat retention effect will not be sufficient. Furthermore, in practice, the diameter of the main body case 2 becomes significantly larger.

The present invention provides such a gas rice cooker in which the rice cooker 20 is surrounded by a heat insulating layer 21 filled with a heat insulating material so that the rice stored in the rice cooker 20 is insulated and kept warm together with the rice cooker 20. ', the objective is to improve the heat retention efficiency and to make the main body case 2 smaller.

* Regarding the invention of claim 1 [Technical means] The technical means of the present invention taken to solve the above problem is "the body of the rice cooker 20 and the cylindrical heat-insulating layer 21".
A cylindrical waste passage 30 with a closed upper end is formed between the exhaust passage 30 and the combustion chamber 11, and a lower end of the exhaust passage 30 is communicated with the combustion chamber 11. A fan F for discharging combustion exhaust gas is provided in the exhaust pipe section 35, the fan F is operated during rice cooking, and the exhaust pipe section 35 is lowered once and then raised.

[Operation] The above technical means of the present invention operates as follows.

During combustion during rice cooking, the fan F is put into operation, and combustion air of the gas burner B is forcibly supplied to the combustion chamber 11 by the suction force of the fan F. That is, gas burner B is caused to burn by forced air supply. Therefore, the cross-sectional area of the exhaust passage 30 is significantly smaller than that in a normal atmospheric pressure combustion system, and even if the gap between the inner circumferential surface of the heat insulating layer 21 and the body of the rice cooker 20 is made small, it is still possible to achieve good results. Combustion can be ensured.

During the rice cooking operation mentioned above, the combustion exhaust is in the exhaust passage 3.
0 through the exhaust pipe section 35, but the exhaust pipe section 35 is only partially located on the outer periphery of the exhaust passage 30.

In addition, the combustion exhaust gas that has ascended through the exhaust passage once descends and is then discharged to the outside via the ascending path, so that smooth exhaust is performed while fan F is operating, and when fan F stops operating at the end of rice cooking. Draft effects are less likely to occur in the air in the exhaust passage 30 that is in contact with the body of the rice cooker 20.

[Effects] Since the present invention has the above configuration, it has the following unique effects.

An exhaust passage 30 is provided around the entire circumference of the rice cooker 20, and the exhaust pipe section 3
Since the exhaust passage 5 is only disposed on a part of the outer periphery of the exhaust passage 30, the overall size can be reduced.

Further, the cross-sectional area of the exhaust passage 30 is the exhaust cross-sectional area due to forced air supply and exhaust combustion, and is sufficiently smaller than that of the conventional one. As a result, when the fan F is stopped after rice cooking is finished, draft action is less likely to occur in this portion, and the heat retention efficiency is improved accordingly. This is because the heat insulating effect of the heat retaining layer 21 acts effectively.

Furthermore, the exhaust gas that has risen through the exhaust passage first falls and then travels up the exhaust passage before being discharged to the outside.
Smooth exhaust is performed while the fan F is operating, and when the operation of the fan F stops at the end of cooking, the rice cooking pot 20
This makes it even more difficult for the draft effect to occur in the air in the exhaust passage 30 that contacts the body of the stove, and further improves the heat retention effect.

*Regarding the invention of claim 2 The invention of claim 2 is the invention of claim 1 which attempts to make the heating temperature distribution of the rice cooker 20 uniform, and the configuration specified for this purpose is as follows:
``The passage cross-sectional area of the exhaust passage 30 in the vicinity of the entrance of the exhaust pipe section 3 is set smaller than other parts.''

In the case where this configuration is adopted, the intake amount of combustion exhaust gas is relatively large, that is, the exhaust pipe portion 3.
Since the cross-sectional area of the exhaust passage 30 near the inlet 5 is smaller than the other areas, the exhaust flow rate of the exhaust passage 30 as a whole is balanced.

Therefore, the entire rice cooker 20 is heated uniformly.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4.

In the first embodiment shown in FIG. 1, as shown in the same figure, a heat insulating layer 21 is formed on the inner surface of the main body case 2, and a heat insulating layer 21 is formed inside a hollow body formed of a steel plate.
The structure is filled with. The rice cooker 20 is supported by the upper end of the outer wall of the heat retaining layer 21 so that the body of the rice cooker 20 is located within the heat retaining layer 21 with a predetermined gap therebetween.

As shown in the figure, the support structure of the rice cooker 20 is such that the collar 23 extending from the top of the rice cooker 20 is supported by the upper end of the heat insulating layer 21, and the body of the rice cooker 20 is The gap between the inner circumferential surface of the heat insulating layer 21 becomes a cylindrical exhaust passage 30. The lower open end of the exhaust passage 30 communicates with the combustion chamber 11, and the upper end is closed by the flange 23.

An opening 36 is formed in a part of the upper end of the exhaust passage 30, and an exhaust cylinder portion 35 communicates with the exhaust passage 30 through this opening. This exhaust passage 35 is the exhaust passage 3
0, and then rises, and a fan F is inserted at this downward bending point.

The cross section of the heat retaining layer 21 has a lower end bent along the bottom of the rice cooker 20, and this bent end faces the lower outer periphery of the flame hole of the gas burner B housed in the lower case 1.

In addition, the combustion exhaust gas is discharged by the suction force of the fan F inserted into the exhaust pipe portion 35, and a predetermined amount of air is supplied into the lower case 1. The air supply amount is
It is set to a predetermined value depending on the capacity of the fan F and the cross-sectional area of the exhaust passage 30.

In this example, when the rice cooker has a rice cooking capacity of about 2, the capacity of the fan F is set to a predetermined value,
If the area of the opening 36 is 500 mm ² , the exhaust passage 30
The average gap in the cross section of 1.5 to 5.5 mm was sufficient.

In this embodiment, when the fan F is operated to cause combustion, the combustion exhaust gas flows through the exhaust passage 30 and the exhaust pipe section 3.
After the rice cooking is completed, the fan F is stopped and the flow of air in the exhaust passage 30 is suppressed to a low level.

Next, in the embodiments shown in FIGS. 2 and 3, the effective exhaust cross-sectional area of the exhaust passage 30 near the opening 36 is set smaller than others, that is, compared to the upstream portion of the exhaust passage 30. This is what I did.

For this reason, the cross-sectional area of the exhaust passage 30 is made uniform,
A baffle plate 37 is made to protrude from the inner circumferential surface of the heat-retaining layer 21 in a half-circumferential area below the opening 36. The shape of this baffle plate 37 is a semicircle with a constant width, and this baffle plate 3
7 is set smaller than the interval between the cross sections of the exhaust passage 30. Therefore, an exhaust passage 30 is provided between the tip of the baffle plate 37 and the body of the rice cooker 20.
Since a gap smaller than the interval between the cross sections is formed, the exhaust flow rate in this part is suppressed.

Since the exhaust suction force by the fan F is concentrated near the opening 36, the exhaust passage 30 near the lower part
Although the exhaust flow rate in this part is larger than that in other parts, the baffle plate suppresses the exhaust gas in this part, so that the overall exhaust flow rate is balanced and the rice cooker 20 is heated uniformly.

The embodiment shown in FIG. 4 has the same effect as the second embodiment, but in this embodiment,
The rice cooker 20 is mounted eccentrically with respect to the cylindrical heat-retaining layer 21, and only in this case, the flow of exhaust air in the lower part of the opening 36 is suppressed, and the exhaust air as a whole is reduced. balance.

In order to attach the rice cooker pot 20 eccentrically, a plurality of protrusions 24, 24 are provided that protrude inward from the upper end of the heat insulating layer 21, and the circles formed by the tips of these protrusions are connected to the body of the rice cooker pot 20. It is sufficient to make the upper end approximately match the diameter and to make this circle eccentric to the heat retaining layer 21 as described above.

In each of the above embodiments, both the rice cooker pot 20 and the heat insulating layer 21 have a circular cross-sectional configuration, but it goes without saying that they may have other cross-sectional shapes.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the first embodiment of the present invention;
3 is an explanatory diagram of the second embodiment, FIG. 4 is an explanatory diagram of another embodiment, and FIG. 5 is an explanatory diagram of a conventional example. In the figures, 11...combustion chamber, 21... Heat retention layer, 20
...Rice cooker, 2...Main case, 30...Exhaust passage, 35...Exhaust pipe section, F...Fan.

Claims (1)

[Utility Model Claims] In a gas rice cooker in which a rice cooker 20 is surrounded by a heat retaining layer 21 filled with a heat insulating material, and the cooked rice contained in the rice cooker 20 is insulated and kept warm together with the rice cooker 20, a cylindrical exhaust passage 30 with a closed upper end is provided between the body of the rice cooker 20 and the cylindrical heat retaining layer 21, the lower end of this exhaust passage 30 is connected to the combustion chamber 11, and a part of the upper end of the exhaust passage 30 is provided as an exhaust tube section 35 with a relatively small cross-sectional area.
2. The gas cooker according to claim 1, wherein the exhaust passage 30 is connected to the exhaust tube 35, a fan F for discharging the combustion exhaust gas is provided in the exhaust tube 35, the fan F is operated during cooking, and the exhaust tube 35 is lowered once and then raised.