JPS6132575Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention and Field of Application] This invention relates to a pressure regulating valve for a pressure cooker.

Pressure cookers use a valve to increase the pressure within the container to a certain value. This valve generally has a valve stem that can be raised and lowered in the hollow part of a valve body fixed to the lid, and the valve stem is raised by internal pressure to cut off communication between the inside of the container and the atmosphere. When the internal pressure decreases, the valve stem is lowered by its own weight, communicating the inside of the container with the atmosphere, and has the function of bringing the inside of the container to almost atmospheric pressure. By the way, if you carelessly open the lid when the internal pressure is high and the valve stem is rising, there is a danger that the boiled food inside will blow out. Furthermore, if the valve stem does not descend even though the internal pressure has decreased, it becomes unclear when it is appropriate to open the lid, which is inconvenient for the user.

[Prior art and its problems]

Japanese Utility Model Application Publication No. 57-99516 has a structure in which a valve stem having a pressure receiving plate is arranged to be movable up and down within a valve body fixed to a lid.

If the steam containing the boiling liquid in the container adheres to the valve seat etc. and solidifies, the valve stem and the valve seat of the valve body will become loose, causing the problem that the valve stem will not descend even if the internal pressure drops. The use of elastic packing further exacerbates this tendency.

Furthermore, the lid can be opened even when the valve stem is raised, which allows the lid to be opened even when the internal pressure is high.
There is a risk of opening the lid and causing the boiled food inside to squirt out.

[Technical issues of the present invention and its technical means]

The technical problem of the present invention is to solve the above-mentioned problems of the prior art, and to solve this problem, a technical means is used in which the valve of the valve stem is coated with a soft resin.

[Operations and effects of the present invention]

When the internal pressure rises, the valve on the valve stem seats on the valve seat on the valve body through the soft resin layer, so this part has good dissociation properties and there is no sticking phenomenon between the valve stem and the valve seat. Further, the raised valve stem is inserted into the hole in the horizontal piece of the lock member, and the movement of the lock member is restricted, so that rotation of the lid is prevented.

[Embodiment]

(1) The valve has an inclined surface, and this inclined surface is in line contact with the valve seat. Because there is less contact surface between the valve and valve seat,
It can eliminate the pecking phenomenon.

(2) The upper part of the valve stem should be square, and the corners should be arcuate.

Reduces the sliding surface between the hollow part of the valve body and the valve stem, Smooth the vertical movement of the valve stem.

〔Example〕

As shown in FIG. 1, the pressure cooker 1 basically includes a lid 3 having an upper handle 2 and a container 5 having a lower handle 4. As shown in FIG. Note that 6 indicates an auxiliary handle fixed to the container 5 at a position opposite to the lower handle 4.

The container 5 has a cylindrical shape with a bottom and an upward opening,
The opening edge has a plurality of spaced engagement pieces 7 extending radially outward. For example, six engaging pieces 7 are formed so that their centers are equiangular, and
The width of one of the engaging pieces is made wider than the remaining engaging pieces. As a result, the dimension between one side of this wide engagement piece 7' and the adjacent engagement piece 7 becomes smaller than the dimension between the other engagement pieces 7. Further, an inwardly protruding surface 8 is formed on one side edge of the engaging piece 7 to support the packing described later and to restrict rotation of the container and the lid.

A locking piece 10 extending radially inward is formed at the opening edge of the side wall 9 of the lid 3 and has a width corresponding to the width between the engaging pieces 7 described above. The locking piece 10 is formed by press working onto the side wall 9 or by casting. The dimension between the engaging pieces 7 is reduced in one place, but the width of the locking piece 10' corresponding to the smaller engaging piece 7' is smaller than the width of the remaining locking pieces 10. Become. Therefore, the dimension between one side of the locking piece 10' having a small width and the adjacent locking piece 10 is larger than other parts. As a result,
The wide engagement piece 7' is in a fitting relationship only at the large portion between the engagement pieces 10, 10', and the container 5
The positioning of the lid 3 can be kept constant at all times.

As shown in FIG. 2, when the lid 3 is rotated relative to the container 5 after the engaging piece 7 and the locking piece 10 are in a fitted relationship, the engaging piece 7 and the locking piece 10 overlap each other. The lid 3 can be fixed to the container 5.

A packing 11 is placed inside the side wall 9 of the lid 3.
The packing 11 has a main body 12 having an annular shape and a substantially rectangular cross section, and upper and lower tongue pieces 13 and 14 extending from the inner peripheral side of the main body 12, and the lid 3 and the container 5 are in a fixed relationship. At this time, the upper tongue piece 13 contacts the inner wall surface of the lid 3, and the lower tongue piece 14 contacts the inner wall surface of the container 5.

In the main body portion 12, the protruding surface 8 provided on the engaging piece 7 functions effectively to ensure the position of the gasket 11 as shown in FIG. 1, in contact with the inner surface of the side wall 9 of the lid 3. Further, this protruding surface prevents the gasket 11 from being lowered and deformed by the engaging piece 7 when the lid 3 and the container 5 rotate relative to each other.

Further, a locking piece 10 is provided on the side wall 9 of the lid 3.
At least one horizontally long hole 15 can be drilled at a suitable location between them. This hole 15 is located in the main body 1 of the packing 11.
2, when the internal pressure of the container 5 rises abnormally, the gasket 11 is pushed into this hole 15 with internal pressure, and the lower tongue piece 14 is separated from between the engagement pieces 7 of the container 5, etc., to create a gap, and the internal pressure is reduced. It acts as a remover.

A lock valve 16 is installed using the upper handle 2 of the lid 3. The lock valve 16 has a hollow valve body 17 fixed to the lid 3, and a valve stem 18 that can be raised and lowered is disposed in the hollow portion of the valve body 17. Lateral hole 19 at the bottom of the valve stem 18
The interior of the container 5 can communicate with the atmosphere through a vertical hole 20 communicating with the horizontal hole 19. A horizontal L-shaped locking member 21 is provided along the upper surface of the valve body 17 and is slidable laterally. A hole 22 is bored in the horizontal part of the locking member 21, and the valve stem 18 is allowed to rise only when the valve stem 18 faces this hole 22. A spring 23, one end of which abuts against the wall of the upper handle 2, is engaged with the vertical portion of the lock member 21. Lock member 2
At the bottom of the vertical part of 1, there is a claw piece 2 facing radially inward.
Fix 4. The claw piece 24 normally projects into the interior of the lid 3 through a hole 25 made in the side wall 9 of the lid 3, and the hole 22 in the horizontal portion of the locking member 21 faces the upper surface of the valve stem 18. When the positional relationship between the lid 3 and the container 5 is as shown in FIG.
Since the locking member 2 comes into contact with the side edge of the engaging piece 7, the locking member 2
1 is forced to the right in FIG. After that,
When the lid 3 is rotated relative to the container 5 and the engaging piece 7 and the locking piece 10 are overlapped, the claw piece 24 is located between the engaging pieces 7, so that it does not come into contact with the engaging piece 7. is released, and the locking member 21 assumes the position shown in FIG. 1 under the force of the spring 23. In the state shown in Figure 1,
The inside of the container 5 has a horizontal hole 19 and a vertical hole 20 of the valve stem 18.
When the internal pressure rises due to heating, the internal pressure acting on the pressure-receiving surface at the bottom of the valve stem pushes up the valve stem 18 against its own weight, pushing it sideways. The hole 19 enters the valve body 17 and blocks communication between the inside and the atmosphere. Moreover, the upper part of the valve stem 18 is
It enters the hole 22 in the horizontal part of the locking member 21. As a result, the lid 3 is rotated relative to the container 5, and the claw pieces 2
4 in contact with the side edge of the engaging piece 7,
Even if an attempt is made to release the overlap between the valve stem 18 and the locking piece 10 to achieve the state shown in FIG.
It is inserted into the hole 22 in the horizontal part of the lock member 2.
1, movement to the right is prevented and the claw piece 24 and the engaging piece 7 are in a locking relationship.
Rotation of the lid 3 relative to the container 5 becomes impossible. That is, as long as there is internal pressure pushing up the valve stem 18, the lid 3 cannot be removed. This prevents the lid 3 from being opened carelessly and the boiled food inside spewing out even though the residual pressure is relatively high. When the internal pressure decreases and the valve stem 18 is lowered, the inside of the container communicates with the atmosphere through the holes 19 and 20, and the valve stem 18 comes out of the hole 22 in the horizontal part of the upper locking member 21, the lid for the container 5 is closed for the first time. 3 rotations are possible.

A weight valve 26 is provided in the center of the lid 3. The weight valve 26 has a nozzle body 29 with a vertical hole 27 in the center and a horizontal hole 28 in the lower part with a nut 30.
is used to fix it to the lid 3, and then the nozzle body 2
The upper opening of the vertical hole 27 is arranged at 9, and a weight 31 which is normally closed is arranged. When the internal pressure of the container 5 reaches a predetermined value or more, the pressure acting on the weight 31 through the horizontal hole 28 and the vertical hole 27 lifts the weight 31 and brings the atmosphere and the inside of the container 5 into communication. Release the internal pressure and maintain the internal pressure at a predetermined value. That is, the weight valve 26 performs a pressure regulating function.

The lid 3 further has a safety valve 32. The safety valve 32 includes a hollow valve body 34 fixed to the lid 3 by a cap nut 33 with a slit, and has a configuration in which a plug 36 having a plurality of horizontal holes 35 is screwed into the valve body 34. The slit and the horizontal hole 35 act as a restriction against the internal pressure, resulting in a large flow path resistance. Therefore, when the internal pressure exceeds a safe value, the pressure is reduced through the slit, hollow section, and horizontal hole 35 to prevent the pressure from rising above a certain value. Even if the safety valve 32 does not operate, it is safe because the packing 11 moves into the hole 15 in the side wall of the lid due to the internal pressure and releases the internal pressure to the outside, as described above.

FIG. 3 shows the valve stem 18 and valve body 17 in detail.
A valve 38 having an inclined surface 37 is provided at the lower end of the valve stem 18. The valve 38 is made of soft resin. The upper part of the valve stem 18 has, for example, a rectangular cross section, and the corners thereof are preferably formed into arcuate surfaces, and the arcuate surfaces are brought into sliding contact with the hollow surface of the valve body. The lower end of the upper part of the valve stem, which forms the circular arc surface, can be seated on the internal step of the valve body, and the step and the valve 38 determine the vertical limit of the valve stem 18.

In the example shown in FIG. 4, the main part 39 of the valve stem 18 is molded from a fluorine resin or the like, and the valve stem upper part 40 having an arcuate surface as described above is formed from a metal material or the like.

In the example shown in FIG. 5, the central main portion 41 of the valve stem 18
is molded from a metal material, the valve stem upper part 40 having the aforementioned arcuate surface is molded from a soft resin, and the valve 38 is molded from a soft resin or the like. The lower surface of the valve stem upper part 40 is made into an inclined surface 42, and the stepped part of the hollow part of the valve body 17 and the inclined surface 42 are brought into line contact.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a cooking device as an example of this invention.
Figure 2 is a bottom view showing the relationship between the lid and the container;
The figure is a detailed sectional view of the lock valve, and FIGS. 4 and 5 are sectional views showing other examples of the valve stem. In the figure: 3...lid, 5...container, 16...lock valve, 17...valve body, 18...valve stem, 21...lock member.

Claims (1)

[Scope of utility model registration request] The valve stem has a valve body that is movable up and down within the hollow part and is fixed to the lid, and a valve provided at the bottom of the valve stem is covered with a soft resin, and the valve stem has a horizontal hole and a vertical hole. A valve for a pressure cooker, characterized in that when the valve stem is raised, the horizontal hole enters the valve body and the valve is seated on a valve seat below the valve body.