JPS6132568Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressure cooker in which a heat sensitive body is placed in the center of a heat source, and the heat sensitive body senses temperature changes at the bottom of the pot to control the heat source, and particularly relates to the configuration of the heat source.

Generally, this type of pressure cooker has a heat source 2 disposed on the inner bottom surface of a cooker body 1, as shown in FIG.
A pot 3, which can be freely moved in and out, is placed on this heat source 2 and the opening of the pot 3 is sealed with a lid 5 via a packing 4. The temperature change at the bottom of the pot 3 is detected by a heat sensor 6 to control the heating. However, since the heat source 2 is composed of a hot plate made of aluminum casting with a sheathed heater cast in one piece, it is necessary for the pot and the hot plate to be in contact over a wide area, which creates problems with adhesion. In particular, if deformation occurs on the bottom of the pot 3 due to pressure distortion during pressure cooking, the adhesion between the pot 3 and the hot plate becomes poor as shown in Figure 2, and the hot plate overheats because heat cannot be efficiently transferred to the bottom of the pot. This not only raises concerns about thermal deformation, but also significantly increases the thermal effect on the heat sensor, making it impossible to perform accurate temperature control.

This proposal was made in view of these points,
The embodiment of the present invention shown in FIGS. 3 to 5 will be described in detail below.

Reference numeral 11 denotes a cooking device main body, in which a heat shield plate 12 is arranged. 13 is a plurality of heater receivers installed upright on the heat shield plate 12, and 14 is a sheathed heater placed on the heater receiver 13 as a heat source, which is wound in a spiral shape and whose inner circumference is larger than the outer circumference by a dimension t. By positioning the inner circumferential portion above the heater receiver 13, the inner circumferential portion is raised above the heater receiver 13. Therefore, this sheathed heater 14
By making the outer circumferential end 14a a fixed end and the inner circumferential end 14b a free end, the inner circumferential portion can be displaced downward.

Reference numeral 15 denotes a reflector plate that covers the lower part of the sheathed heater 14 and is elastically supported on the heat shield plate 12 with a spring 16. Reference numeral 17 denotes a heat sensitive body located in the center of the sheathed heater 14 and penetrating through the reflection plate 15.
It is elastically supported on 2 with a spring 18, and its heat-receiving surface is brought into elastic contact with the bottom of the pot, which will be described later. Reference numeral 19 denotes a pot that can be taken in and out of the cooking device main body 11 and is placed on the sheathed heater 14. 20 is packing the opening of the pot 19 21
It is a lid which is sealed via a pressure regulator 22 which is well known in the art. 23 is an operation panel of the cooking device main body 11, 24 is a timer, and 25 is an electronic control circuit assembly.

In the above configuration, when the pot 19 is not placed, the sheathed heater 14 is in a state where the inner circumferential portion is higher than the outer circumferential portion and can be displaced downward, as shown in the fourth figure. Therefore, in order to perform pressure cooking, the pot 19 is connected to the sheathed heater 14.
When placed on top, the inner peripheral portion of the sheathed heater 14 is bent downward by the weight of the pot 19 and its contents, so that the sheathed heater 14 is uniformly brought into close contact with the bottom surface of the flat pot 19. At this time, even if the bottom of the pot 19 bulges slightly upward due to manufacturing variations, the sheathed heater 14 will adhere uniformly to the bottom of the pot 19 as when it is flat; When the bottom surface of the sheathed heater 14 begins to bulge downward, the inner peripheral part of the sheathed heater 14 near the heat sensitive element 17 is in close contact with at least the bottom surface of the pot 19 to prevent overheating, so that radiation due to red heat is suppressed. Thermal influence on the heat sensitive body 17 is small, and the heat sensitive body 17 can accurately sense temperature changes at the bottom of the pot 19.

Note that when the heights of the inner and outer circumferences of the sheathed heater 14 are the same, if the bottom of the pot 19 bulges upward even a little, the inner circumference of the sheathed heater 14 near the heat sensitive element 17 will come into contact with the bottom of the pot 19. Instead, it overheats,
A large amount of radiant heat is radiated due to the red heat, and the radiant heat has a large thermal effect on the heat sensitive body 17. As a result, the heat sensitive body 17 cannot accurately sense the temperature change of the pot 19, resulting in a significant decrease in control accuracy. In addition, in order to eliminate these drawbacks, extremely high precision is required when manufacturing the pot 19, and in this embodiment, the above-mentioned drawbacks can be eliminated, and when manufacturing the pot 19, extremely high precision is required. This eliminates problems with accuracy.

Therefore, if the timer 24 is set and the sheathed heater 14 is energized while the pot 19 is placed, the heat of the sheathed heater 14 is efficiently transmitted to the pot 19, heating the contents and raising the internal pressure to a predetermined cooking pressure. Rise. Once the cooking pressure has risen to a predetermined level, the predetermined cooking pressure is maintained by temperature control, that is, energization control to the sheathed heater 14 by the action of the heat sensitive element 17 and the electronic control circuit assembly 25, and the pressure regulator 22 is operated. The pressure cooker is operated without causing any problems, and the cooking is finished when the timer 24 expires.

During such pressure cooking, if pressure distortion occurs and the bottom of the pot 19 bulges downward as shown in Figure 5, the outer circumference of the sheathed heater 14 will
Separate from the bottom of 9. However, the inner peripheral part of the sheathed heater 14 near the heat sensitive element 17 is in contact with the bottom surface of the pot 19, and heat is efficiently transmitted to the pot 19.
There is no overheating or red heat, and therefore the thermal influence on the heat sensitive body 17 is small, and the temperature change of the pot 19 can be accurately sensed by the heat sensitive body 17, allowing highly accurate control. Incidentally, even in the conventional case shown in FIG.
The inner circumferential portion of the hot plate near No. 7 is in contact with the bottom of the pot, but in the case of the hot plate type, the overheating of the outer circumferential portion directly affects the inner circumferential portion, and as a result, the thermal influence on the heat sensitive body increases significantly.

When the pot 19 is removed after pressure cooking is completed, the sheathed heater 14 returns to its original state due to its own elasticity.

Here, other embodiments of the present invention will be mentioned.

1. By tilting the upper edge of the heater receiver 13 downward inward or by cutting out the inside of the heater receiver 13, even if the bottom of the pot 19 bulges downward, the bottom of the pot 19 and the sheathed heater 14 can be kept connected. It can be made to adhere uniformly.

2. By forming the sheathed heater 14 in a ring shape and meandering in the inside and outside directions, the sheathed heater 14 may be disposed across the inside and outside.

It goes without saying that the present invention may be modified and implemented as appropriate without departing from the scope of the invention.

As described above, according to the configuration of the present invention, even if the bottom of the pot bulges slightly downward or upward, the thermal effect on the heat sensitive element can be suppressed to a minimum, and the temperature change at the bottom of the pot can be accurately sensed by the heat sensitive body, resulting in high accuracy. This is an extremely useful device that can overcome the drawbacks of the previous method, such as being able to control the pot and not requiring high precision in the production of pots.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional configuration diagram showing a conventional pressure cooker, Fig. 2 is an explanatory diagram when pressure strain occurs in the same as above, Fig. 3 is a schematic cross-sectional configuration diagram showing the pressure cooker of the present invention, and Fig. 4
The figure is an explanatory diagram when the pot is not placed, and FIG. 5 is an explanatory diagram when pressure strain occurs. 11: Cooker body, 14: Sealed heater, 1
7: Heat sensitive body, 19: Pot, 20: Lid, 21: Packing.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A cooking device body, a heat source disposed on the inner bottom surface of the cooking device body, a pot that can be freely entered and exited from the cooking device body and placed on the heat source, and a hermetically sealed device through an opening packing of the pot. and a heat-sensitive member located at the center of the heat source and in elastic contact with the bottom of the pot to control the heat source according to temperature changes at the bottom of the pot, the heat source being constituted by a sheathed heater, and the sheathed heater straddling the inside and outside. The sheathed heater is arranged so that its inner circumferential part is located above the outer circumferential part, and at least the inner circumferential part can be displaced downwardly. A pressure cooker characterized by being configured so as to be in close contact with the bottom of the pot. 2. The pressure cooker according to claim 1, which is a registered utility model, in which a sheathed heater is spirally wound so that its outer peripheral end is a fixed end and its inner peripheral end is a free end. 3. The pressure cooker according to claim 1, which is a registered utility model and has a sheathed heater formed in a ring shape and meandering inward and outward directions.