JPS636010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a casing made of an elastic body that can be inserted into a hole in a lid of a steam pressure cooking container and has an opening; a valve body that is supported by the steam pressure cooking vessel and comes into contact with the opening when the steam pressure in the steam pressure cooking vessel increases and passes through the opening when the steam pressure increases above a set pressure; a receiving chamber for the valve body provided on the receiving chamber; at least one vent hole for venting steam in the receiving chamber to the side; and a receiving chamber for the valve body provided in the receiving chamber from the opening. Relating to a safety valve for a steam pressure cooker, comprising means for returning to the chamber; and;

This type of safety valve is disclosed in West German Patent Publication No. 1247581
Known by the number. The casing of this safety valve was shaped like a cap, had thick walls, and was provided with an annular flange at the open end for fitting into a hole in the lid of the steam pressure cooking vessel. This annular flange abuts the inner surface of the lid flange. Around the opening of this safety valve there is provided an annular ridge projecting inwardly from the wall of the casing, the annular ridge being arranged at the level of the upper surface of the lid. The casing extends above this annular ridge,
This extended part is used as a receiving chamber. This receiving chamber is provided with a vent hole for discharging steam outward in the radial direction, and furthermore, an opening for introducing a valve body is formed in the center of the bottom wall thereof. The valve body is
It consists of a shaft with a mushroom-shaped head at one end and a seal at the other end. The seal portion is formed into a hemispherical shape, and the hemispherical surface is continuous with the side surface of the shaft body. Under normal conditions, that is, when the lid is attached to the pot under low pressure or atmospheric pressure, the shaft passes through the opening and also through the opening in the center of the bottom wall. the mushroom-shaped head is located on the outside of the casing;
and is supported on the surface of the bottom wall facing the pot. The mushroom-shaped head thereby holds the seal on the pot side of the opening, the seal being located below the annular ridge. Therefore, at the start of cooking, the heated air passes between the sealing part and the wall surface at the annular protuberance in the casing, flows into the receiving chamber through the opening, and then exits from the radial vent hole. It can leak out. As the steam generation in the pot increases, the valve body is pushed up and the seal closes the opening, thereby allowing the pressure in the pot to increase further. When the pressure in the pot exceeds a predetermined maximum value, the sealing part of the valve body is pushed into the receiving chamber through the annular ridge. This opens the opening and allows steam to be discharged through the opening and the vent hole in turn. In order to return the safety valve to its operating state after such an opening operation, pressure must be applied to the mushroom-shaped head of the valve body, and usually some type of device is used to apply pressure to the hot valve body. It is necessary to do so. Furthermore, steam is discharged from the opening in the center of the lid as the pressure returns, which is dangerous for the cook.

The technical problem on which the invention is based is to provide a safety valve of the type mentioned above which can be manufactured easily and economically and which can be reliably returned to service without the use of any equipment.

This technical problem is solved by the fact that the casing 1 has an opening 7
A housing part for accommodating the valve body 8 is provided on the side of the steam pressure cooking vessel, and this housing part is provided with at least one opening 9 that opens into the steam pressure cooking vessel, and the valve body 8 is closed when the pressure is low or atmospheric. body 8 is supported by and held spaced apart from aperture 9;
The receiving chamber 5 has a dome shape with a sealed top, and the receiving chamber 5 is formed to be easily deformable so that when the top is pushed from the outside, the valve body 8 is pushed back into the housing part through the opening 7. This problem is solved by the configuration that is used.

The valve body is supported within the housing part by its own weight at a distance from the opening, and there is no need to suspend and support the upper part of the valve body. This simplifies the structure of the valve body and allows it to have a simple shape. This feature provides the advantage that it is not necessary to provide a vertical hole in the receiving chamber for suspending and supporting the valve body. Therefore, there is no upward steam discharge, and the cook is not bothered by the steam. Furthermore, after the safety valve performs a pressure release operation, by pressing the top of the casing, the valve body returns to the housing part through the opening, and there is no need to touch the valve body directly, but the valve body is held in the discharged steam. There's no need to.

Referring again to the conventional safety valve, West German Publication No. 2947861 discloses a valve in which the top is formed in the form of a membrane and the upper part of the valve body is disposed within the top. This valve is used only as a safety valve in one embodiment and only as an exhaust valve in another embodiment. The casing is common to both embodiments. The casing has a bulge capable of closing the top opening, which bulge surrounds the opening which is opened and closed by a valve body. Furthermore, the side walls of the casing are provided with radial holes for venting air and steam. The difference between the two embodiments is the shape of the valve body and the action of the membrane-like top. Among these embodiments, the one related to the present application is an embodiment as a safety valve, and in this embodiment, the valve body has a head formed at both ends of the shaft body, and the valve body including the head The total length corresponds to the distance between the opening and the inner surface of the membranous top. In this embodiment, the membranous top acts as a spring and presses against the upper head of the valve body, bringing the lower head into contact with the opening from the side remote from the pot, thereby closing this opening. . When the pressure inside the pot reaches the upper limit determined by the elastic force of the membrane-like top, the valve body deforms the membrane-like top outward against the pressing force of the membrane-like top and pushes up, opening the valve. release. Steam can then pass through the opening and be discharged from the radial holes. When the pressure decreases, the membranous top presses against the valve body and returns to the sealed state. In order to prevent the valve body from moving diagonally within the casing and thereby inhibiting its operation, an intermediate wall approximately parallel to the top is inserted between the membranous top and the opening. The valve body is guided by a guide hole bored in the intermediate wall.

Further, in the embodiment as an exhaust valve, the valve body has a long shaft body, and heads are formed at both ends. In this case, one head is arranged inside the casing and the other head is arranged outside the casing and opposite the edge of the opening facing into the pot. When the pressure inside the pot is low or atmospheric, the valve body is suspended and supported with its upper head disposed within the casing;
The lower head is spaced apart from the opening. The heated air is then discharged through the openings and through the radial holes. When the pressure increases, the lower head abuts the opening from the side close to the pot and closes it. The length of the shaft body is set so that the upper head part contacts the membranous top part from the inside when the exhaust valve is closed. The valve body can thus be pushed downwards from the outside by pressing on the membranous top, thereby opening the opening. In this way, the steam pressure can be reduced and the pot opened earlier. In this embodiment as well, the valve body is guided by a transverse wall having guide holes. This transverse wall is also used to set the distance from the lower temporal opening. Here, the upper head is larger than the opening, and is normally supported while resting on the opening. Both of these embodiments are the premise of the present invention.

Claim 2 of the present application provides a simple configuration of the casing, in which the centrally located opening is for closing the valve when the pressure rises abnormally. The safety valve emits an alarm and only axial pressure acts on the valve body.

According to claim 3 of the present application, a spherical valve body that is easy to manufacture and has high precision is used. The spherical valve body ensures reliable valve actuation and allows loosening of casing tolerances. Moreover, no additional guiding means are required and the sphere does not tilt.

According to claim 4 of the present application, the opening facing the inside of the pot is not closed during normal times, which ensures effective evacuation before the pressure builds up, and creates a vacuum at the end of cooking. There isn't.

According to claim 5 of the present application, in normal times and at the start of cooking, the spherical valve body is placed over an opening having a shape in which a plurality of convex curves are connected to the outer periphery of a circle so as to project outward, The heated air is exhausted from the convex curve around the spherical valve body with almost no disturbance. When the pressure increases, pressure acts on most of the spherical surface of the valve body, pushing the valve body up to the height of the valve seat.

An embodiment of the invention is illustrated in the drawing.

In FIGS. 1 and 2, the safety valve has a housing 1 which is fitted and secured in a bore 2 of a lid 3, which is partially illustrated. The lid 3 is a component of the steam pressure cooker and is capable of closing the steam pressure cooker and maintaining the internal pressure for cooking. The casing 1 is integrally formed of an elastic material such as rubber, and has a valve body chamber 4 therein.
is formed. The valve body chamber 4 is inserted into the lid 3 and arranged near the end of the safety valve facing into the steam pressure cooker, and the casing 1 is further provided with a receiving chamber 5 located above the top surface of the lid 3. ing.
The valve body chamber 4 and the receiving chamber 5 are located near the hole 2,
Both chambers 4 and 5 are partitioned by a partition wall 6 and communicated through an opening 7 formed in the partition wall 6.

A spherical valve body 8 is accommodated in the valve body chamber 4 .

The valve body chamber 4 has a side wall 4a with high strength and a bottom wall 4b.
An opening 9 is bored in the center of the bottom wall 4b. As is clear from FIG. 2, the opening 9 is
It has a contour in which small arcs 10 are connected to three locations on the outer periphery of a circle 10a, and the small arcs 10 are arranged at equal intervals and extend to the outside of the circle 10a. The radius r of the circle 10a from the center M of the opening 9 is the radius r of the circle 10a from the center M of the opening 9.
is smaller than the radius R of . Further, the small arc 10 extends so as to be in contact with the inner surface of the side wall 4a.

The receiving chamber 5 is formed in a dome shape, and its wall 5a becomes gradually thinner as it moves away from the partition wall 6. This allows the receiving chamber 5 to be deformed relatively easily. A pair of air vent holes 11 are formed in the wall 5a at a height of about 1/3 of the total height of the receiving chamber 5, and extend through the wall 5a in the radial direction. The wall 5a above this vent hole 11 and the top wall 5b continuing to the upper end of this wall 5a are sealed.

Next, the operation of this safety valve will be explained.

In the state before starting cooking, the valve body 8 rests on the opening 9 while being supported by the circle 10a. When the lid 3 is attached to the steam pressure cooker in a conventional manner and cooking is started, the heated air inside the steam pressure cooker is discharged upward. At this time, the air passes through the small circular arc 10a around the valve body 8, and is further discharged to the outside through the opening 7 and the vent hole 11. When steam starts to be generated, the flow between the valve body 8 and the opening 7 becomes high-speed, so the negative pressure acting on the top surface of the valve body 8 acts against the negative pressure generated on the bottom surface of the valve body 8. The body 8 is levitated and the opening 7 is closed. In this completely sealed steam pressure cooker, the pressure increases as energy is introduced. The pressure within the steam pressure cooker at this time can be monitored using a known pressure gauge. Generally, the energy supply to a steam pressure cooker is controlled so that the pressure within the steam pressure cooker does not exceed a predetermined pressure required for cooking. The safety valve remains closed until cooking is finished and the pressure has decreased to such a point that the valve body 8 returns above the opening 9. When the safety valve opens, excess steam is discharged from the safety valve.

When the time of reduction of energy supply is delayed from the proper time and the pressure inside the steam pressure cooker becomes higher than the set pressure of the safety valve, the valve body 8 is pushed into the opening 7 and passes through the opening 7 upward. The upward movement of the valve body 8 at this time is stopped by the top wall 5b of the receiving chamber 5. This allows steam to escape radially through the openings 7 and out of the vent holes 11. The steam being vented and the sound it makes is an alarm to the cook, telling him that the energy supply should be reduced. This alarm also allows the cook to know that the valve body 8 is in the receiving chamber 5. When such an alarm is issued and cooking should be resumed after energy supply has been stopped, the top wall 5b of the receiving chamber 5 is pressed to contact the valve body 8, and the top wall 5b is further pushed in, thereby removing the valve body. 8 returns into the valve body chamber 4 through the opening 7, and the safety valve can be easily returned to the operating state. This return operation of the safety valve can be performed with bare hands without requiring any tools. This is because the surface of the top wall 5b is thermally insulated from the valve body 8.
Although a small amount of steam may leak from the receiving chamber 5 until the valve body 8 is pressed against the edge of the opening 7, under other normal conditions, steam is discharged from the vent hole 11. It will not be done. When the valve body 8 is returned to the valve body chamber 4 with the steam pressure in the pot exceeding the set pressure, the safety valve will issue an alarm again, so it is necessary to perform the return operation again. In this way, the safety valve prevents the pressure inside the pot from increasing abnormally in any case, issues a warning of pressure increase, and returns to the operating state safely and easily after the pressure decreases.

The safety valve that issued the alarm has its valve body 8 inside the receiving chamber 5 and its opening 7 closed from above, but some people use such a safety valve to start cooking without knowing it, and the safety valve closes immediately after the start of cooking. If you are not aware that no air is being expelled from the pot, the pressure inside the pot will only rise to a relatively low pressure. When the pressure inside the pot rises only to a pressure lower than the normal sealing pressure of the safety valve, the valve body 8 floats above the edge of the opening 7, and steam is discharged from the vent hole 11. In addition to this state of the safety valve, the related behavior of the safety valve may cause
It can be known that the safety valve is not activated.

Note that it is also possible to forcibly hold the valve body in a proper state by combining the safety valve with a sealing device or a regulating device of the steam pressure cooker and pushing the top wall 5b by some means.

The invention is not limited to the above embodiments. That is, it is also possible to make the valve body into a shape other than a sphere within the technical scope of the present invention. For example, the valve body is made into a short cylindrical shape with substantially spherical end surfaces,
The wall of the valve body chamber may be shaped to guide the valve body. Furthermore, a valve body that penetrates the opening in the partition wall can also be adopted.For example, a protrusion is provided on the sphere, this protrusion is inserted into the opening in the partition wall, and a disk is fitted onto the protrusion. A sesame-shaped valve body may also be formed.

Within the scope of the invention, it is also possible to add an opening to the valve body chamber 4 or to form the entire valve body chamber in a mesh shape. Further, the shape of the opening 9 can be any shape as long as it is non-circular, and may be oval, for example.

The number of air vent holes in the receiving chamber is not limited to two, and one or three or more air vent holes may be provided. However, the vent hole must be formed so that the steam to be vented can stay in a relatively wide area around the valve body; in other words, the vent hole must be formed in a sector-like shape that is closed by the wall 5b around the valve body. must be made large enough.

[Brief explanation of the drawing]

FIG. 1 is a sectional view taken along the - arrow line in FIG. 2 showing the safety valve according to the present invention together with a lid, and FIG. 2 is a view taken in the direction of the arrow in FIG. 1 as seen from inside the pot. DESCRIPTION OF SYMBOLS 1... Casing, 2... Hole, 3... Lid, 4... Valve body chamber, 4a... Side wall, 4b... Bottom wall, 5... Reception chamber, 5a
...Wall, 5b...Top wall, 6...Partition wall, 7...Opening, 8...
Valve body, 9...Opening, 10...Small arc, 10a...Circle, 1
1...Vent hole.

Claims (1)

[Scope of Claims] 1. A casing made of an elastic body that can be inserted into a hole in a lid of a steam pressure cooking container and has an opening; housed within the casing and supported at a distance from the opening when the pressure is low; When the steam pressure of the steam pressure cooking container increases, it comes into contact with the opening,
a valve body that passes through the opening when the steam pressure is higher than the set pressure; a receiving chamber for the valve body provided on the side of the casing remote from the steam pressure cooking container; A safety valve for a steam-pressure cooking vessel, comprising: at least one vent hole for venting air to the casing; and means for returning the valve body in the receiving chamber from the opening to the valve body chamber; is provided with an accommodating portion for accommodating the valve body 8 on the side closer to the steam pressure cooking container than the opening 7, and this accommodating portion is provided with at least one opening 9 that opens into the steam pressure cooking container. Alternatively, at atmospheric pressure, the valve body 8 is supported by the opening 9 and held apart from the opening 8, and the receiving chamber 5 has a dome shape with a sealed top. A safety valve characterized in that the valve body 8 is formed to be easily deformable so that when pushed, the valve body 8 is pushed back into the housing portion through the opening 7. 2. The accommodating portion for accommodating the valve body 8 is a valve body chamber 4 integrated with the casing, and one opening 9 is provided in the center of the valve body chamber 4. safety valve. 3. The safety valve according to claim 1 or 2, wherein the valve body 8 is formed in a spherical shape. 4. The safety valve according to claim 2 or 3, wherein the opening 9 provided in the center of the valve body chamber 4 is non-circular. 5 The shape of the opening 9 is a plurality of convex curves 10 on the outer periphery of a circle.
5. The safety valve according to claim 4, wherein the convex curves 10 are arranged at intervals. 6. The safety valve according to claim 5, wherein the convex curve 10 is a circular arc. 7. The wall of the dome-shaped receiving chamber 5 is formed so as to become gradually thinner toward the top. safety valve.