JPS6018Y2 - pressure cooker - Google Patents

Description

[Detailed description of the invention] This invention operates in a pressure cooker to reduce the pressure inside the container when the pressure inside the container rises above the normal operating pressure, such as when the nozzle of the pressure adjustment weight becomes clogged. Regarding a pressure cooker equipped with a pressure safety device that prevents danger by reducing the pressure, the present invention aims to improve the pressure safety device so that it always operates reliably, and to provide a pressure cooker that does not cause danger or malfunction. It is.

Household pressure cookers are dangerous products and are subject to the recently enacted Product Safety Law, and according to this law,
A final safety device must be provided that operates at a pressure within three times the normal pressure in case of abnormal conditions.

Conventionally, safety devices provided in this type of pressure cooker have often been made of a fusible alloy that melts at a temperature corresponding to the operating pressure and communicates between the inside and outside of the container.

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, variations in the components and subtle differences in the sealing state may be affected. Thirdly, the confirmation test is a destructive test, so the true value cannot be determined and statistical estimation must be relied upon.

In addition, a thin disc of silicone rubber is fitted into the recess of the main body,
When the pressure inside the pot rises above the normal pressure, a chip-type type is also used that bends under the pressure applied to the thin disk of the silicone comb, slips out of the recess, and relieves the pressure. The disadvantage is that the operating pressure varies due to variations in the thickness and hardness of the rubber plate and the shape of the head portion of the main body.

In view of the above circumstances, the present invention aims to provide a pressure cooker equipped with a pressure safety device that has high operating pressure accuracy, can be freely set, is reproducible, and does not cause malfunctions.

EMBODIMENT OF THE INVENTION Hereinafter, a pressure rice cooker showing an embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a cylindrical pot with a bottom, which is connected to M3 via a backing 2 to form a closed pressurized cooking container.

The structure of the safety device 30 is such that a cover 5 is fixed to the upper opening of the safety device main body 4 with a screw portion 6, and the cover 5 is fastened to the lid 3 with a nut 7.

Valve 8 and spring 9 inside the safety device body 4 and cover 5
This closes the valve hole 10 of the safety device main body 4 and determines the constant operating pressure of this safety device.

The sliding surfaces of this valve 8 and the safety device both have a circular cross section, and there is a gap between them (in the example, the diameter difference is 0.4 to 0.6wn).
)have.

A horizontal slit 13 communicating with the valve hole 10 is provided below the safety device main body 4.

Furthermore, an inner cover 16 is attached to the convex portion at the bottom of the safety device body using a holder 15 made of silicone rubber.

The inner lid 16 has a rising part on the outer periphery and a plurality of small holes at the bottom, and by forming a space between the lower surface of the lid, it prevents clogging of the nozzle of the pressure adjustment weight 18 and this safety device, and also prevents pressure cooking. At times, steam and bubbles are separated to prevent boiling over.

Reference numeral 17 is a nozzle for adjusting pressure, and reference numeral 18 is a weight, and the pressure in the container during normal rice cooking is determined by the diameter of the hole in the nozzle 17 and the weight of the weight 18.

19 is the lid knob, 21 is the body, 22 is the body handle, 2
3 is a heating plate, 24 is a protective frame, 26 is a switch, and 27 is a leg.

In the above configuration, when the nozzle 17 becomes clogged for some reason and the pressure inside the container rises above the specified pressure determined by the hole diameter of the nozzle 17 and the weight of the weight 18, the spring 9 of the safety device is activated via the valve 8. When the pressure reaches a level greater than the force blocking the valve hole 10 of the safety device main body 4, the spring 9 is deflected and the valve 8 moves upward.

At this time, the valve hole 10 is opened and the pressure escapes through the valve hole and drops.

After the pressure drops, the spring 9 presses the valve 8 downwards into its pre-operational state.

The above is the operation of the safety device, but in this embodiment, after the safety device operates, it may return to its original state and be used continuously.

When the safety device is activated, the Oneva and contents are sucked in along with the steam inside.

At this time, the solids are prevented from entering by the horizontal slit 13, but the oneba enters the inside of the main body.

If the valve is left in this state, there is a risk that the valve inserted between the valve and the main body may become stuck and become inoperable the next time it is used.

Particularly when the valve is made of metal, it tends to adhere easily.

In this invention, the valve 8 is made of fluororesin, which is difficult to adhere to, and since there is a suitable gap between the main body and the valve, there is no risk of it being stuck by the valve, and it operates continuously. It becomes possible.

In addition, if the gap is made smaller and the inclination of the valve is restricted, a D-cut is required on one side to allow steam to pass through when it is activated, but according to the present invention, there is no need to make a D-cut. This is also related to the material of the valve, and since steam escapes from the entire circumference of the sliding surface, there is no chance of the valve becoming stuck.

On the other hand, if the gap becomes large, there is a drawback that the operation of the valve becomes uncertain.

As is clear from the above description, according to the present invention, there is a suitable gap between the valve and the main body, and there is no risk of sticking due to overhang, etc., so that continuous use is possible and stable operation is obtained.

Furthermore, the configuration of the safety device is simplified, and in particular, the shape of the valve is simplified, so it has great practical value.

[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 safety device of the same pressure cooker, FIG. 3 is a perspective view of the main part thereof, and FIG. 4 is a sectional view showing the operating state of the same safety device. 1...Pot, 2...Backing, 3...
... Lid, 4 ... Safety device body, 8 ...
...Valve, 9...Spring, 10...
Valve hole.

Claims (1)

[Scope of utility model registration request] In a pressure cooker that constitutes a sealed pressurized container by a bottomed cylindrical pot, a lid covering an upper opening of the pot, and a backing interposed between the pot and lid, a pressure safety plate is attached to the lid. The device consists of a valve hole at the bottom of the valve body and a valve that is biased in the direction of closing the valve hole.The valve is made of fluororesin, and both sliding surfaces with the valve body have a circular cross section. A pressure cooker characterized by having a gap clearance between the valve and the valve that serves as a valve guide and a steam discharge passage.