JPH0534604Y2 - - 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 between the exhaust passages provided around the outer periphery of the rice cooker is reduced, improving heat retention efficiency, and the surface temperature of the main body case located on the outer periphery of the heat insulation layer is reduced by the cold air that is forced in. The aim is to reduce the number of accidents and improve safety.

[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. 2, a main case 2 containing a rice cooker 20 is placed on a lower case 1 containing a gas burner B. Main case 2
A rising exhaust passage 31 and a descending exhaust passage 32 are arranged side by side by dividing the space between the rice cooking pot 20 and the rice cooking pot 20 by a partition tube 3,
The outer peripheral wall of the descending exhaust passage 32 located on the outer peripheral side is made into a cylindrical heat retaining layer 21 filled with a heat insulating material.

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, since the upper end of the exhaust passage that comes into contact with the body of the rice cooker 20 containing cooked rice is closed, it is insulated and kept warm by the heat insulating layer 21, and the exhaust passage is closed. Since ventilation flow due to draft effect is less likely to occur, heat retention efficiency is improved.

However, in the case of the above-mentioned exhaust system, although it is effective for keeping the temperature warm that draft action is less likely to occur in the exhaust passage, this is disadvantageous 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 is designed so that the rice cooker 20 is surrounded by a heat insulating layer 21 provided inside the main body case 2 and filled with a heat insulating material, and the cooked rice stored in the rice cooker 20 is insulated and kept warm together with the rice cooker 20. In a 'gas rice cooker', it is possible to lower the temperature of the lower mechanism housing part such as the gas burner and fire extinguishing mechanism and the surface temperature of the body of the main body case, improve heat retention efficiency, and downsize the main body case. The task is to make it happen.

[Technical Means] The technical means of the present invention taken to solve the above problems is as follows: ``The rice cooker 20 is housed in the main body case 2, and a cylindrical shape is provided between the main body case 2 and the body of the rice cooker 20. A heat insulating layer 21 is provided, and this heat insulating layer 21 and the rice cooker 2
The gap between the heat insulating layer 21 and the outer periphery of the main body case 2 is defined as an exhaust passage 30 that opens upward from the combustion section of the gas burner B and between the upper end of the main body case and the upper end of the rice cooker. is a cold air passage 34 that reaches from a lower mechanism housing part such as a gas burner or a fire extinguishing mechanism to cold air exhaust ports 35, 35 formed at the upper end of the main body case 2, and a fan F is installed in the lower mechanism housing part.
The air supplied by the fan F is guided to the gas burner B and the cold air passage 34, and the fan F is operated during rice cooking.

[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 air for combustion in the gas burner B is forcibly supplied from 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, a part of the air sucked by the fan F is transferred from the lower mechanism housing part to the cold air passage 34.
It will also be introduced. Therefore, these areas of the main body case 2 are constantly cooled by the supplied cold air.

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

Similar to the conventional example described above, on the outer periphery of the rice cooker 20,
There will be two passages, but since the cross section of these passages will be relatively small, the main body case 2
The whole can be downsized.

Further, the cross-sectional area of the exhaust passage 30 may be any cross-sectional area necessary for forced air supply and exhaust, and is sufficiently smaller than 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, since the main body case 2 is constantly air-cooled by the cold air passing through the cold air passage 34 during rice cooking, the surface temperature of the main body case 2, which serves as the exterior case of the appliance, is kept low and safe.

Furthermore, since the interior of the lower mechanism accommodating section for the gas burner, fire extinguishing mechanism, etc. is constantly air-cooled during rice cooking, the temperature rise in this portion can also be suppressed to a low level.

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

In this embodiment, as shown in the figure, the heat insulating layer 2
1 is supported by a main body case 2, and the heat insulating layer 21 has an outer wall made of a steel plate and a heat insulating material D filled inside. and,
A rice cooker 2 is inserted into this heat insulating layer 21 through a predetermined gap.
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.

As shown in the figure, the support structure of the rice cooker 20 includes a plurality of inverted L-shaped support pieces 22 that partially protrude from the upper end of the body and the collar 23 of the rice cooker 20.
22 is supported by the upper end of the inner circumferential side of the heat insulating layer 21, and the gap between the body of the rice cooker 20 and the inner circumferential surface of the heat insulating layer 21 is cylindrical and opens upward and downward to exhaust air. This becomes the passage 30.

The lower open end of the exhaust passage 30 is connected to the combustion chamber 1.
The flame hole portion of the gas burner B housed in the lower case 1 is arranged in a ring shape, and this flame hole portion faces the combustion chamber 11. Therefore, the combustion exhaust gas is reliably guided to the exhaust passage 30.

The outer peripheral part of the heat insulating layer 21 is integrally connected to the upper end of the main body case 2 over the entire circumference at its upper end,
A predetermined gap is formed between the two, and this gap also has a cylindrical shape and opens upward and downward, forming a cold air passage 34. The upper end of this cold air passage 34 is connected to the main body case 2
Numerous cold air exhaust ports 35, 35 formed at the upper end of the
The lower end open portion faces the lower part or the outer periphery of the combustion chamber 11 in the lower case 1 .

A fan F is provided at the bottom 12 of the lower case 1, so that a predetermined amount of air is supplied into the lower case 1. The amount of air supplied by the fan F is set to be larger than the amount of combustion air of the gas burner B, and the ratio of the amount of combustion air is determined by the capacity of the fan F and the cross-sectional area of the exhaust passage 30. The ratio is set to a predetermined ratio by

Therefore, the remaining amount of air other than the combustion air is discharged as is through the cold air passage 3.

Note that the amount of air passing through this cold air passage 34 only needs to be the amount necessary to air-cool the main body case 2, and does not need to be set to a very large value. In particular, there is a heat insulating layer 21 on the inner circumferential side of the main body case 2, and the combustion exhaust passing through the exhaust passage 30 is insulated by the heat insulating layer 21, so in this respect as well, the amount of air is Less is better. From this,
It is also possible to set the cross-sectional area of the cold air passage 34 to be significantly smaller.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, and Fig. 2 is an explanatory view of a conventional example.
...Body case, 30...Exhaust passage, 34...Cold air passage, B...Gas burner, F...Fan.

Claims (1)

[Scope of utility model registration request] The rice cooking pot 2 is constructed by surrounding the rice cooking pot 20 with a heat insulating layer 21 provided inside the main body case 2 and filled with a heat insulating material.
In the gas rice cooker, the rice stored in the rice cooker 2 is insulated and kept warm together with the rice cooker 20.
0 is housed in the main body case 2, a cylindrical heat insulating layer 21 is provided between the main body case 2 and the body of the rice cooker 20, and the gap between this heat insulating layer 21 and the rice cooker 20 is filled with a gas burner B. An exhaust passage 30 opens upward from the combustion part of the main body case and the upper end of the rice cooker, and the gap between the heat insulating layer 21 and the outer periphery of the main body case 2 is used as a gas burner or a lower mechanism such as a fire extinguishing mechanism. A cold air passage 34 that reaches from the storage portion to cold air exhaust ports 35, 35 formed at the upper end of the main body case 2,
A fan F is provided in the lower mechanism accommodating portion, and air supplied by the fan F is transferred to the gas burner B.
and the cold air passage 34, and when cooking rice, this fan F
A heat-retaining gas rice cooker that operates.