JPS6044B2 - pressure cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device that senses when a dangerous high pressure condition occurs due to an abnormality in the control mechanism of the normal control pressure in a pressure cooker, and operates in a non-automatic recovery condition. be.

Household pressure steel is a dangerous product and is subject to the recently enacted Product Safety Law.According to this law, it must be operated at a pressure within three times the normal pressure in case of abnormal conditions. A final safety device shall be provided.

Conventionally, as a safety device provided in this type of pressure cooker, a device made of a fusible alloy, which melts at a temperature corresponding to the operating pressure and spreads inside and outside the container, has often been used.

However, there are several drawbacks to this method: ``Firstly, the operating pressure (temperature) cannot be set arbitrarily in relation to the alloy components, and secondly, it is affected by variations in the components and subtle differences in the sealing state. The operating pressure (temperature) may vary considerably, and the third
Another reason is that the confirmation test is based on a destructive test, so the true value cannot be determined and must be based on L statistical estimation.

Other methods of valves that are simply biased with weights or springs cannot be used on their own because they cannot create a non-automatic return state and only maintain a dangerous pressure.

In view of the above circumstances, the present invention aims to provide a final safety device for a pressure cooker that has good operating pressure accuracy, can be freely set, is reproducible, and has a simple structure.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure, the outer frame of the main body is formed by drawing a 1G metal plate into a cylindrical shape, and 2 is an inner frame which is similarly formed and attached to the inside of the outer frame 1.

A heater 3 serving as a heat source is attached to the inner bottom of the inner frame 2, and a pot 4 made of an aluminum plate is removably mounted on the heater 3. The lid 5 is formed so that its end engages with the flange of the steel 4 via a silicone rubber gasket 6, and is opened and closed by horizontal rotation of the handle 7. 4, lid 5, gasket 6
A closed container is constructed.

Reference numeral 8 is a weight for internal pressure control, which closes the through hole of the valve seat 9 attached to the lid 5 with its own weight.

The weight 8 and the valve seat 9 constitute a pressure control device that maintains the internal pressure of the closed container at a constant pressure. On the other hand, 10 is a display board made of 70 rustic that summarizes the instrument display and operation part, 11
6 is the time switch knob.

12 is a bush connector for connecting to a power source, and 13 is a leg.

Furthermore, the handle 7 has a cavity 14 extending in the outer circumferential direction at the bottom thereof.
A valve 16 biased by a spring 15 and a valve hole 17 are provided in a part of the cavity 14, and this combination allows operation at a higher pressure than the operation of the pressure control device to control the operation of the closed container. A safety device is configured to open the section.

Note that the control pressure by this safety device is determined by the size of the valve hole 17 and the biasing force of the spring i6 so that it is a constant value within three times the operating pressure of the pressure control device. and cavity 1
4 is connected to this safety device, and is communicated to a part of the outer shell 1 of the main body at the end side of the handle basin through an outlet turtle 8 to the outside.

On the other hand, a handle 20 having a hollow space 19 is attached to the outer blade 1 below this blow-out row 8, and this hollow wing 9 is equipped with a solid type over-rise prevention device connected in series to the mirror heater 3. A thermal fuse 21 is housed therein.

In addition, a sensing hole 22 is provided in the upper part of the handle 20 facing the blowout row 8, and a discharge port 23 is provided in the lower part. Electricity is connected.

Next, to explain the operation of the above configuration, during cooking at the normal pressure using the weight 8, for example, food scraps or the like may clog the through hole of the valve seat 9, and the internal pressure of the sealed container will rise below the normal pressure. When the pressure is exceeded, the set pressure of the safety device in the cavity 14 of the handle 7 is reached, the spring 15 is deflected, and high-pressure steam is ejected from the valve hole 16 into the cavity 14. This is guided by the cavity 14 and is blown out at the end of the cavity 14. From row 8, empty space 19 of handle 20
sprayed on. Since the steam is high temperature, the thermal fuse 21, which operates at a lower temperature, is blown to cut off the power supply circuit. Therefore, the power supply that was maintaining the abnormally high voltage is cut off, and the dangerous high voltage condition is eliminated after a certain amount of time. Note that although the thermal fuse 21 cannot be reused unless it is replaced, there is no particular problem because such an abnormal state does not occur frequently and can be reused by replacing it.Furthermore, in the above embodiment, The thermal fuse 21 also works as a safety device when the temperature control device etc. breaks down in a high temperature state without pressure, that is, in a dry state.
may be another temperature rise prevention device, such as a non-automatic return type bimetallic thermostat.

Furthermore, the location of each element may be determined in relation to other design factors. In addition, since the detection pressure of the safety device is determined only by the area of the valve hole 17 and the spring 15 that closes and biases it, or a weight, etc., the accuracy is high, and the operating value can be set freely, and the pressure can be inspected freely. The relationship between the temperature of the ejected steam and the operating temperature of the thermal fuse depends on the location where it is installed, but in general, the former can be raised by a fairly large difference, so the operation of the thermal fuse is reliable.

In addition, as in the example, an overtemperature rise prevention device is provided on the main body side,
By spraying it here, it can also be used as a safety device during dry firing, and is also convenient for electrical wiring.

As is clear from the above description, the pressure cooker of the present invention opens a part of the sealed container using a safety device that operates at a pressure higher than the operating pressure of the pressure control device, and the steam ejected from this part causes the temperature to rise. The heat source is shut off by operating the rise prevention device, which prevents high pressure from remaining inside the sealed container, making it highly safe.

[Brief explanation of the drawing]

The figure is a partially cutaway sectional view of a pressure cooker showing an embodiment of the present invention. 3... Heater with coins, 4... Pot, 5...
... Lid, 6 ... Gasket, 8 ... Weight, 9 ... Valve seat, 15 ... Spring, 16 ...
・Valve, 17... Valve hole, 21... Temperature fuse.

Claims (1)

[Scope of Claims] 1. A heat source that heats the sealed container, a pressure control device that maintains the internal pressure of the sealed container at a constant pressure, and a safety device that operates at a pressure higher than the constant pressure to open a portion of the sealed container. and,
A pressure cooker comprising an overtemperature rise prevention device that shuts off heating by the heat source by steam ejected from a part of the airtight container that is opened by the operation of the safety device. 2. The pressure cooker according to claim 1, wherein the overtemperature rise prevention device is provided at a position that detects the dry firing state of the closed container.