JPS6139810B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure cooker in which a packing having a transverse T-shape in cross section is interposed between a pot and a lid to form an airtight container, and is intended to facilitate the operation of opening the lid after cooking is completed. It is something to do.

Conventionally, the surface of the packing interposed between the pot and the lid, which is held in horizontal contact with the lid and the pot, has been flat.

When the cooking is finished and the heat supply to the pot is stopped, the steam filling the pot cools down, the pressure inside the pot decreases, and no air enters from outside the pot, so the inside of the pot cools down. The pressure becomes lower than atmospheric pressure (negative pressure phenomenon).

Due to this negative pressure phenomenon, the packing interposed between the lower surface of the engaging portion of the lid and the upper surface of the flange portion of the pot is pressed into close contact.

Once they are in close contact with each other, even if you remove the pressure adjustment weight and return the pressure inside the container to atmospheric pressure, the pot and packing will not work.
The problem was that the close contact between the lid and the packing was not resolved, and due to the close contact force, the lid had to be rotated heavy, making it difficult to open the lid.

The present invention solves the above-mentioned conventional drawbacks, and embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is the pot, 2 is the lid, which covers the upper opening of the pot 1, and 3 is the packing, which is interposed between the pot 1 and the lid 2, and whose role is to increase the pressure without letting the steam inside the pot escape. do.

4 is a nozzle that is attached to the lid 2 and has a hole that communicates the inside of the pot with the outside; 5 is a pressure adjusting weight that closes the top of the nozzle 4 to keep the pressure inside the pot constant. 6
is a knob for holding the adjustment weight 5.

Reference numeral 7 denotes a lid handle, which facilitates handling of the lid 2. 8 is a pot handle that makes it easy to hold when carrying pot 1.

A heater 9 supplies heat to the pot 1. 10 is a temperature sensor that detects the temperature inside the pot. 11 is a protective frame on which the heater 9 is placed, and the outer case 1
It is fixed to 2.

The upper end of the pot 1 is formed with a stepped portion 1a on which a packing 3 is placed and a bayonet-shaped engaging portion 1b. The lid 2 is formed with a bayonet-shaped engaging portion 2a that engages with the engaging portion 1b of the pot 1 by horizontal rotation. The packing 3 has contact parts 3a and 3b that come into contact with the inner surface of the pot 1 and the inner surface of the lid 2, and the stepped portion 1a of the pot 1 and the lid 2.
It has a horizontal holding part 3c that is held in contact between the engaging parts 2a, and has a substantially horizontal T-shape in cross section. Also, Patsuking 3
The upper and lower surfaces of the holding part 3c have minute irregularities 3d on the entire surface.
is formed.

Next, the operation of the above configuration will be explained.

First, the food to be cooked and water are placed in the pot 1, the packing 3 is placed on the step 1a of the pot 1, and the lid 2 is put on. When you are ready, turn on the switch and start energizing the heater 9.

The temperature of the food and water in the pot 1 rises due to the heat supplied from the heater 9, and the pressure rises with the generation of steam, which is determined by the hole diameter of the nozzle 4 and the weight of the weight 5. When the pressure is reached, the weight 5 is lifted and the pressure is kept constant.

When cooking is finished and the heat supply from the heater 9 to the pot 1 stops, the temperature inside the pot 1 decreases, and at the same time the temperature inside the pot 1 decreases.
The internal pressure also decreases. Steam temperature in pot 1 is 100℃
At this time, the pressure inside the pot becomes equal to atmospheric pressure (0 gauge pressure), and when the temperature drops further below 100°C, the pressure inside the pot 1 becomes lower than the atmospheric pressure because no air flows into the pot from outside.

For this purpose, the lid 2 is pulled downward, and the holding part 3c of the packing 3 is pressed between the engaging part 2a of the lid 2 and the stepped part 1a of the pot 1.

However, the holding part 3c of the packing 3 that contacts the engaging part 2a of the lid 2 and the stepped part 1a of the pot 1 has minute irregularities 3d, so the contact area is small and the adhesion force is small.

Therefore, when an attempt is made to rotate the lid 2 by taking the pressure adjusting weight 5, the opening operation is performed smoothly.

As described above, in the pressure cooker of the present invention, minute irregularities are formed on the entire surface of the holding part of the packing, which has an approximately horizontal T-shaped cross section and seals between the pot and the lid, so that the pressure inside the pot increases. Sometimes, the pot and lid come into pressure contact with this minute uneven surface, creating a sealed state. On the other hand, when the pressure inside the pot drops, the convex part of the holding part of the packing rebounds and breaks the tight contact with the pot or lid. As a result, the recesses connect to form a flow path with the outside air, preventing negative pressure inside the pot, and therefore reducing the rotational force when rotating the lid to open it. It is small and allows for smooth opening operations.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a pressure cooker showing an embodiment of the present invention, FIG. 2 is a sectional view of the main parts of the same pressure cooker,
FIG. 3 is a perspective view of the packing of the pressure cooker. 1... Pot, 1a... Step part, 1b... Engaging part, 2
... Lid, 2a ... Engagement part, 3 ... Packing, 3
a, 3b...Abutting part, 3c...Holding part, 3d...
Unevenness.

Claims (1)

[Claims] 1 A cylindrical pot with a bottom and a lid covering the upper opening of the pot are provided with bayonet-shaped engaging portions that engage with each other by horizontal rotation of the lid, and a contact portion that abuts the inner surface of the pot and the inner surface of the lid. A hermetically sealed pressurized container is constructed by sealing the space between the pot and the lid with a packing having a generally horizontal T-shaped cross section and a holding portion held between the upper end of the pot and the lid, and the packing is held by the packing. A pressure cooker with minute irregularities formed on the entire surface.