JPS635635Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a safety device for a pressure cooker.

For bayonet connection type pressure cookers,
In addition to the safety valve device that releases the steam pressure to the outside if the steam pressure inside the container body rises abnormally during cooking, there is also a safety valve device that releases the steam pressure to the outside if the steam pressure inside the container body rises abnormally. and a locking device that prevents the lid from turning in the direction of opening when the steam pressure inside the container body is high after cooking. It is considered effective to have the following.

Various proposals have been made for each of the above devices, but when each of these devices is provided, each device is individually attached to the lid, and therefore three mounting holes are provided in the lid. In addition to the necessity of installing each device, it takes time and effort to install each device, the work efficiency is poor, and the number of parts is large, resulting in high costs.

In view of the above points, the present invention aims to provide a safety device for a pressure cooker that integrates three devices and eliminates the conventional drawbacks.

Next, the present invention will be explained with reference to illustrated embodiments.

First, a configuration in which three devices are integrated will be described with reference to a cross-sectional view shown in FIG. 1A.

In the figure, 1 is a hollow guide tube attached to the lid 2 via packing (for example, caulking means);
3 is a hollow cylinder that moves up and down inside the guide cylinder 1,
The cylinder body 3 has a flange part 3a for opening and closing the upper end opening 1a of the guide cylinder 1, and has a small diameter part 3c at the top and a large diameter part 3d at the bottom by forming a step part 3b on the outer peripheral wall. The outer diameter of the guide tube 3d is set to be slightly smaller than the hollow inner diameter of the guide tube 1.

Reference numeral 4 designates a pressure receiving plate, and a hollow cylindrical portion 4a integrally formed with the pressure receiving plate 4 is screwed into the lower part of the inner cavity of the cylindrical body 3 via a packing 5.

6 is a safety valve, and the above-mentioned cylindrical body 3 is attached to the safety valve 6.
A rod 6a is attached that passes through the inner cavity of the cylinder 3, and a spring 7 is wound around the outer periphery of the rod 6a between the upper step of the inner cavity of the cylinder 3 and the safety valve 6.

Therefore, the safety valve 6 is biased so as to always close the upper end opening 4b of the hollow cylindrical portion 4a of the pressure receiving plate 4.

As described above, the safety valve 6, rod 6a, and spring 7 form a safety valve device, and the cylinder 3 and pressure receiving plate 4 form an on-off valve device.
The pressure receiving plate 4 constitutes a locking device, and is in the state shown in the figure before the lid 2 is mounted in a predetermined position on a container body (not shown) and connected to the bayonet.

Next, FIG. 2 shows a perspective view of an engaging plate that operates the above-mentioned on-off valve device and locks the locking device.

In the figure, reference numeral 8 denotes an engagement plate that is attached to the inner wall of the container body (for example, by riveting means), and a locking piece 9 is provided protrudingly provided above one side of the engagement plate 8, and a tapered portion 10a is provided below the other side. Tapered part 10
An engagement piece 10 consisting of a flat part 10b connected to a
is installed protrudingly.

Next, the operation of the present invention will be explained with reference to FIGS. 1A to 1E.

(1) As described above, FIG. 1A shows a state in which the lid 2 is placed in a predetermined position on the container body and before the lid is rotated for bayonet connection.

(2) FIG. 1B shows a state in which the lid 2 has been rotated in a predetermined direction to complete the bayonet connection from that shown in FIG.

At this time, the cylindrical body 3 holds the front end of the lock piece 9,
The pressure receiving plate 4 passes under each of the lock pieces 9, and the bottom surface of one end of the pressure receiving plate 4 rides on the tapered portion 10a, and the cylinder body 3, safety valve 6, and rod body 6a rise, but the bayonet connection is still incomplete. It is in.

In this state, the cylinder 3 rises inside the guide cylinder 1, and its collar 3a opens the upper end opening 1a of the guide cylinder 1, and the upper end step 3b of the large diameter part 3d of the cylinder 3. approaches the lower end of the inner cavity of the guide cylinder 1, but since a relatively large gap is formed between the outer periphery of the small diameter portion 3c of the cylinder body 3 and the inner cavity wall of the guide cylinder 1, there is no inside of the container body. It is communicated with the outside through the gap and the upper end opening 1a of the guide cylinder 1.

Therefore, even if cooking is carried out with the bayonet connection incomplete, there is no risk of the steam pressure and temperature inside the container body escaping to the outside and the lid being accidentally blown away, and the lid can be removed from the guide tube 1. An incomplete bayonet connection can be recognized by leakage of steam.

(3) FIG. 1C shows a state in which the lid 2 is further rotated from that shown in FIG.

In this state, the large diameter portion 3d of the cylinder 3 moves upwardly into the inner cavity of the guide tube 1, and the gap between the outer circumferential surface of the large diameter portion 3d and the inner cavity wall of the guide tube 1 becomes very small.

(4) FIG. 1D shows a state in which the bayonet connection is completed and the pressure control valve (not shown) is heated and is just before it starts operating.

In this state, the pressure receiving plate 4 further rises due to the steam pressure inside the container body, and the lower end opening of the guide tube 1 (the gap between the large diameter part 3d of the tube 3 and the inner wall of the guide tube 1) is closed by the packing 5. The container is closed, the inside of the container is kept airtight, and pressure cooking is performed.

One side of the pressure receiving plate 4 is located close to and opposite to one side of the locking piece 9 of the engagement plate 8.

Therefore, even if you try to turn the lid 2 in the opening direction to open the lid 2 while the steam pressure inside the container body is still high after cooking has finished, one side of the pressure receiving plate 4 will come into contact with the locking piece 9 and the lid will close. Rotation is prevented, and it is possible to prevent the lid 2 from flying off.

That is, when the cylinder body 3 protrudes to a considerably higher position than the guide cylinder 1 as shown in FIG. 1D, this indicates that the residual steam pressure is high.

(5) If the steam pressure inside the container body rises abnormally during cooking (for example, due to a failure of the pressure control valve), please refer to Figure 1E.
As shown in the figure, the safety valve 6 rises against the spring 7 to open the upper end opening 4b of the cylindrical portion 4a of the pressure receiving plate 4, and high-pressure steam is released to the outside through the gap between the inner wall of the cylindrical body 3 and the rod 6a. to prevent damage to the pressure cooker.

As described above, the present invention includes a safety valve device that releases the abnormally increased steam pressure inside the container body during cooking to the outside, and an on-off valve that communicates the inside of the container body with the outside when the bayonet connection is incomplete. The lid is equipped with a safety device that integrates a locking device that prevents the lid from rotating in the opening direction when the residual vapor pressure inside the device and container body is high, so the lid only needs to have a single mounting hole. Moreover, the installation work is extremely simple, the work efficiency is improved, and it is possible to provide pressure cooking that is inexpensive and easy to use.

[Brief explanation of the drawing]

FIG. 1A is a sectional view showing an embodiment of the present invention;
Figures B to E are sectional views showing the operating state, and Figure 2 is a perspective view of the engagement plate. 1... Guide tube, 2... Lid, 3... Cylinder body, 4...
Pressure receiving panel, 5... Packing, 6... Safety valve, 8...
...Engagement plate, 9...Lock piece, 10...Engagement piece.

Claims (1)

[Scope of utility model registration request] a hollow guide cylinder fixed to the lid; a hollow cylinder having a flange that moves up and down within the guide cylinder to open and close the upper end opening of the guide cylinder; and a hollow cylinder having a small diameter part and a large diameter part formed on the outer periphery;
A pressure receiving plate screwed onto the lower inner wall of the cylindrical body, a spring-biased valve so as to always close the upper end opening of the cylindrical part formed on the pressure receiving plate, and a valve attached to the inner wall of the container body in a raised position. A locking piece that is close to the outer surface of the pressure receiving plate when the lid is turned, an engaging piece that has a tapered portion on which the lower surface of the pressure receiving plate slides when the device is turned in the lid closing direction, and a flat portion that is connected to the tapered portion. A safety device for a pressure cooker, comprising a protruding engagement plate.