JP7257764B2 - pressure cooker - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure cooker having an inner lid that is provided on a lid on the top of a main body and covers an upper opening of a pan that is housed in the main body and into which food to be cooked is put.

2. Description of the Related Art Conventionally, a pressure cooker is known which is composed of a main body configured to accommodate a pot therein and a lid covering the pot inside the main body. Among such pressure cookers, there are known pressure cookers equipped with a variable pressure means for changing the internal pressure of the pot.

For example, a pressure cooker such as a pressure-type rice cooker has a pot housed in a main body, a lid body that closes the main body and the pot is attached so that it can be opened and closed, and an inner lid that closes the pot is attached to the lower surface of the lid body. It is An annular lid packing attached to the outer peripheral edge of the inner lid is in close contact with the upper inner surface of the pot and the flange portion of the pot. A pressure cooker performs cooking such as rice cooking by operating a pressure device provided on a lid to pressurize and depressurize the inside of a pot while the pot is sealed with a lid packing. The inner lid is detachably attached to the lower surface of the lid so as to facilitate maintenance such as cleaning.

In the rice cooker disclosed in Patent Document 1, a lid packing attached to an inner lid is brought into close contact with the pot in order to seal the pot. As a sealing structure of the rice cooker, a lid packing fixed by a packing base is attached to the outer peripheral edge of the inner lid. The lid packing is provided with a seal portion that is in close contact with the flange portion of the pot.

In the case of the close contact structure of the technology of Patent Document 1, the internal pressure of the pot sealed by the lid packing becomes lower than the atmospheric pressure, so that the inner lid sinks toward the pot side while being elastically deformed. Here, since a hole communicating with an electromagnetic valve or the like is formed in the inner lid, a pressure regulating portion is provided for sealing the electromagnetic valve and the hole of the inner lid using a pressure reducing packing. As a result, when the inner lid is elastically deformed and sinks toward the pan, the decompression packing attached to the pressure regulating part contacts the upper surface of the inner lid while elastically deforming, and follows the sinking of the inner lid. The contact between the vacuum packing and the inner lid is stabilized.

Japanese Patent Application Laid-Open No. 2009-142701

In the rice cooker disclosed in Patent Document 1, when the thickness of the inner lid is thin, the elastic deformation of the inner lid increases when the internal pressure of the pot becomes less than the atmospheric pressure, and the inner lid sinks significantly. Become. In order to ensure contact between the decompression packing and the upper surface of the inner lid when the inner lid sinks significantly, it is necessary to set the elastic deformation stroke of the decompression packing as large as possible. However, when the elastic deformation stroke of the decompression packing becomes large as in this case, the hole in the inner lid and the opening of the decompression packing are likely to be misaligned when assembling or attaching the inner lid, creating a gap in the pressure regulating section and causing the pressure to rise. I had an issue that made it unusable.

In addition, if the thickness of the inner lid is increased in order to reduce the sinking of the inner lid, the inner lid itself becomes heavy, making it difficult to open and close the lid or attach the inner lid.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure cooker capable of suppressing sinking due to elastic deformation of the inner lid and having a thin and light inner lid.

A pressure cooker according to the present invention comprises an inner lid provided on a lid on an upper part of a main body and covering an upper opening of a pot housed in the main body into which food to be cooked is put, and a heating means. The inner lid protrudes vertically downward or upward from a basic plane portion parallel to the upper opening of the pot, and sinks due to elastic deformation of the inner lid when the internal pressure of the pot is reduced. a central portion including the center point of the inner lid, and a convex portion communicating with the central portion and extending radially in a direction from the central portion toward the edge portion of the inner lid. and a plurality of branch portions formed, wherein the inner cover is elliptical, the convex portion is formed symmetrically with respect to the long axis and the short axis of the elliptical inner cover, and a plurality of is radially formed between the long axis and the short axis of the elliptical inner cover, and the central part is larger than the short axis side of the elliptical inner cover on the long axis side. is also greatly formed .
In addition, the pressure cooker according to the present invention includes an inner lid provided on a lid on an upper portion of a main body and covering an upper opening of a pot that is housed in the main body and into which food to be cooked is put, and a heating means. , the inner lid protrudes vertically downward or upward from a basic plane portion parallel to the upper opening of the pot, and elastically deforms the inner lid when the internal pressure of the pot is reduced. a central portion including the center point of the inner lid, and a convex portion communicating with the central portion in a direction from the central portion to the edge portion of the inner lid. and a plurality of radially formed branch portions, and a vacuum packing arranged on the outer surface of the inner lid, wherein the vacuum packing is arranged at a position of the basic plane portion other than the convex portion. There is.

According to the pressure cooker according to the present invention, the inner lid is formed with a convex portion protruding vertically from the basic plane portion parallel to the upper opening of the pot. As a result, the rigidity of the inner lid itself is increased by the projection. Therefore, the inner lid can be suppressed from sinking due to elastic deformation, and the inner lid can be thin and light.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external perspective view which shows the pressure cooker which concerns on Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the pressure cooker which concerns on Embodiment 1 of this invention. FIG. 3 is an enlarged vertical cross-sectional view showing the pressure regulating section according to Embodiment 1 of the present invention; 1 is an external perspective view showing an inner lid according to Embodiment 1 of the present invention; FIG. Fig. 2 is a top view showing the inner lid according to Embodiment 1 of the present invention; FIG. 6 is a vertical cross-sectional view showing the inner lid according to Embodiment 1 of the present invention, taken along the AA cross-sectional line in FIG. 5; FIG. 5 is an enlarged vertical cross-sectional view showing a pressure regulating portion according to Modification 1 of Embodiment 1 of the present invention; FIG. 9 is an enlarged vertical cross-sectional view showing the vicinity of the pressure regulating portion of the inner lid according to Modification 2 of Embodiment 1 of the present invention; FIG. 11 is an external perspective view showing an inner lid according to Modification 3 of Embodiment 1 of the present invention; FIG. 6 is an external perspective view showing an elliptical inner lid according to Embodiment 2 of the present invention. FIG. 11 is an external perspective view showing an elliptical inner lid according to Modification 4 of Embodiment 2 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below based on the drawings. In addition, in each figure, the same reference numerals denote the same or corresponding parts, and this is common throughout the specification. Also, in the drawings of cross-sectional views, hatching is appropriately omitted in view of visibility. Furthermore, the forms of components shown in the entire specification are merely examples and are not limited to these descriptions.

Embodiment 1.
<Configuration of Pressure Cooker 100>
FIG. 1 is an external perspective view showing a pressure cooker 100 according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view showing pressure cooker 100 according to Embodiment 1 of the present invention.

As shown in FIGS. 1 and 2, the pressure cooker 100 includes a main body 1 having a heating coil 8 as heating means, and a lid 2 closing the top surface of the main body 1 . The main body 1 and the lid body 2 constitute the outer shell of the pressure cooker 100 . The main body 1 has an upper frame 5 forming an outer shell of the main body 1 on its outer periphery. Further, inside the main body 1, a bottomed cylindrical pot accommodating portion 7 is formed which hangs down from the main body 1. As shown in FIG.

A detachable bottomed cylindrical pot 3 is stored in a pot housing part 7 of the main body 1. - 特許庁The pot 3 housed in the pot housing portion 7 is suspended from the upper end of the pot housing portion 7 by a flange portion 31 provided on the upper edge of the pot 3 and projecting outward. The upper surface of the flange portion 31 and the inner surface of the tubular portion 32 of the pan 3 are connected by a curved surface portion 33 . The cross-sectional shape of the curved surface portion 33 is an R shape.

The pressure cooker 100 includes a lid 2 that can open and close the upper opening of the main body 1, that is, the surface where the pot 3 stored in the pot accommodating portion 7 is open. One end of the lid body 2 is connected to the main body 1 by a hinge 4 and configured to be rotatable. The lid 2 also has a spring that biases the hinge 4 in the opening direction. The end of the lid 2 opposite to the hinge 4 is locked by a locking structure provided on the main body 1 . The lid 2 is unlocked and opened by operating a locking button 6 provided on the upper frame 5 of the main body 1 . Then, the pot 3 is closed by closing the lid 2 and engaging it with the main body 1 side.

The pot 3 installed in the pot accommodating portion 7 is mainly made of aluminum with good thermal conductivity. As shown in FIG. 2, a heating coil 8 as a heating means for electromagnetic induction heating of the bottom portion of the pot 3 is provided on the bottom portion of the pot accommodating portion 7 of the main body 1 . When a high-frequency current is supplied to the heating coil 8, the pan 3 is heated by an alternating magnetic field generated by the heating coil 8, and the liquid, rice, vegetables, or other food in the pan 3 is heated. Note that the heating means such as the heating coil 8 may be separated from the main body 1 .

The lid 2 includes a plastic outer lid 9 that forms the upper contour of the lid 2 and a lower lid 10 that forms the lower surface that is the inner surface of the lid 2 . An inner lid 11 for opening and closing the upper opening of the pan 3 is detachably attached to the lower lid 10 and the distance from the lid body 2 is variable. That is, the inner lid 11 is provided on the lid body 2 on the upper part of the main body 1 and covers the upper opening of the pot 3 which is housed in the main body 1 and into which the food to be cooked is put. In addition, the inner lid 11 may be integrally fixed to the lid body 2 .

The inner lid 11 is made of a metal material such as a stainless steel plate or an aluminum plate. The inner lid 11 is provided with a basic plane portion 114 parallel to the upper opening of the pot 3 . A convex portion 112 is formed on the basic flat portion 114 of the inner lid 11 . An annular lid packing 12 is attached to the inner lid 11 along the outer peripheral edge of an edge portion 113 formed above the basic flat portion 114 of the inner lid 11 and forming an annular flat portion. The lid packing 12 abuts on both the upper surface of the flange part 31 of the pan 3 and the inner surface of the pan 3 to close the gap between the pan 3 and the inner lid 11 to seal the pan 3. The lid packing 12 is made of an elastic member such as silicone rubber or fluororubber and is formed in an annular shape, and serves as a sealing member that seals the inside of the pot 3 . The lid packing 12 is also attached to the packing support 13 together with the inner lid 11 . A pressure regulating portion 20 for regulating the internal pressure of the pot 3 is formed on the upper surface side of the inner lid 11 .

<Configuration of Pressure Adjusting Unit 20>
FIG. 3 is an enlarged vertical cross-sectional view showing pressure regulating section 20 according to Embodiment 1 of the present invention. As shown in FIG. 3 , the inner lid 11 includes a lid packing 12 and a pressure regulator 20 that regulates the internal pressure of the pot 3 . In the pressure regulating portion 20, the inner lid 11 is formed with a hole 111 that communicates with the electromagnetic valve 201 and the like.

Pressure regulating portion 20 is provided with decompression packing 202 that seals hole 111 in inner lid 11 and electromagnetic valve 201 and the like. The vacuum packing 202 is arranged on the outer surface of the inner lid 11 . The decompression packing 202 is arranged at the position of the basic flat portion 114 of the inner lid 11 other than the convex portion 112 . A hole 111 as a through hole is formed in the inner lid 11 at the place where the decompression packing 202 is arranged. The decompression packing 202 is an elastic member such as silicone rubber or fluororubber, is formed in a tubular shape, and is attached to the electromagnetic valve 201 side.

A hanging mouth portion 203 of the decompression packing 202 is arranged so as to be in contact with the upper surface of the inner lid 11 . The opening 203 and the upper surface of the inner lid 11 are sealed so as not to create a gap.

<Convex portion 112 of inner lid 11>
FIG. 4 is an external perspective view showing the inner lid 11 according to Embodiment 1 of the present invention. FIG. 5 is a top view showing the inner lid 11 according to Embodiment 1 of the present invention. FIG. 6 is a longitudinal sectional view showing the inner lid 11 according to Embodiment 1 of the present invention along the AA sectional line of FIG.

As shown in FIGS. 4 to 6, the inner lid 11 is formed with a convex portion 112 projecting vertically from a basic flat portion 114 . The convex portion 112 protrudes downward toward the inner side of the pot 3 . The convex portion 112 is a convex plane portion that protrudes from the basic plane portion 114 by the same amount. In addition, the convex portion 112 may protrude upward toward the outside of the pot 3 .

The convex portion 112 of the inner lid 11 is largely arranged in the central portion of the inner lid 11 and is deeply squeezed and extruded into a cross shape which is a cross shape. That is, the convex portion 112 includes the center O of the inner lid 11 and is formed point-symmetrically with respect to the center O of the inner lid 11 . The convex portion 112 has a central portion 112a including the center O of the inner lid 11, and a plurality of four branch portions 112b extending radially outward from the central portion 112a. There is no limit to the number of branches 112b as long as they are plural. The four branch portions 112b are radially formed at equal intervals in the circumferential direction of the inner lid 11 . Thereby, the convex portion 112 is cross-shaped. The four branches 112b have the same width and extend radially outward. The convex portion 112 is formed on a stepped portion 116 of an R-processed portion whose portion connected to the basic flat portion 114 is chamfered.

The inner lid 11 has such a large and deeply drawn projection 112 . As a result, the rigidity of the inner lid 11 itself is increased, and sinking due to elastic deformation of the inner lid 11 is reduced when the internal pressure of the pan 3 is gradually reduced below the atmospheric pressure.

Since the sinking of the inner lid 11 is reduced, the elastic deformation stroke of the decompression packing 202 can be reduced, and stable sealing can be obtained.

Since the sinking of the inner lid 11 is reduced, the degree of freedom in positioning the pressure regulating section 20 inside the lid 2 is increased, and the mounting of the pressure regulating section 20 inside the lid 2 is facilitated.

By increasing the rigidity and strength of the inner lid 11, the plate thickness of the inner lid 11 can be reduced and the weight can be reduced.

Since the inner lid 11 is made lighter, the lid packing 12 and the packing support 13 can be easily assembled to the inner lid 11 in terms of assembly workability. Also, the assembled inner lid 11 can be easily attached to the lid body 2 . In addition, the opening and closing operation of the lid body 2 becomes easier.

<Modification 1>
FIG. 7 is an enlarged longitudinal sectional view showing pressure regulating section 20 according to Modification 1 of Embodiment 1 of the present invention. Here, the same items as those of the above-described embodiment are omitted, and the characteristic portions thereof will be described.

As shown in FIG. 7, when the internal pressure of the pot 3 is reduced below the atmospheric pressure, the thin inner lid 11 is greatly bent, and the upper surface of the inner lid 11 in contact with the decompression packing 202a sinks. expected to be included. For this reason, the vacuum packing 202a has a bellows-like shape on the cylindrical portion thereof so as to follow the sinking of the inner lid 11, and is formed in a structure having a large expansion and contraction stroke due to elastic deformation. The decompression packing 202a is an elastic member such as silicone rubber or fluororubber.

Here, the natural length of the decompression packing 202a is long, and the structure is designed to be able to follow a large sinking amount of the inner lid 11. As shown in FIG. Therefore, when the inner lid 11 is attached to the lid body 2 by elastically deforming the decompression packing 202a, the cylindrical portion of the decompression packing 202a is bent or tilted. Then, it is considered that the hole 111 of the inner lid 11 and the opening 203a of the decompression packing 202a are misaligned, making it difficult to arrange them in proper positions.

Also, in the case of adopting a structure that takes into consideration the reduction of the expansion and contraction stroke of the decompression packing 202a, the sinking of the central portion of the thin inner lid 11 farthest from the support of the pot 3 is maximized. Therefore, it is conceivable to place the decompression packing 202a closer to the edge of the inner lid 11 as much as possible. However, the arrangement of the pressure regulating section 20 including the decompression packing 202a is structurally restricted. For this reason, the degree of freedom in arrangement of the pressure regulating section 20 is deprived in the first modification. However, like Modification 2 described later, the structure of Modification 1 can also be included in the present invention.

On the other hand, in the structure of the pressure regulating section 20 according to Embodiment 1 shown in FIG. The deflection of the inner lid 11 having the portion 112 is very small. Therefore, the sinking of the upper surface of the inner lid 11 in contact with the decompression packing 202 is also very small. Further, a structure that allows the decompression packing 202 to have a large expansion/contraction stroke is not required, and the decompression packing 202 may be formed to have a structure that allows a small expansion/contraction stroke.

In the structure of the pressure regulating portion 20 shown in FIG. 3, the overall length of the decompression packing 202 is shortened, so that the cylindrical portion of the decompression packing 202 is less likely to bend or tilt when the inner lid 11 is attached to the lid body 2. Become. As a result, the hole 111 of the inner lid 11 and the mouth portion 203 of the decompression packing 202 can be arranged at appropriate positions, which facilitates assembly. Since the contact between the vacuum packing 202 and the inner lid 11 is also stabilized, the airtightness between the vacuum packing 202 and the inner lid 11 can be ensured.

In the structure of the pressure regulating part 20 shown in FIG. 3, when the inner pressure of the pot 3 is in a decompressed state in which the internal pressure is less than the atmospheric pressure and gradually decreases, the inner lid 11 having the protruding portion 112 which is deeply squeezed and extruded in a cross shape is formed. Deflection is minimal. Therefore, the sinking of the upper surface of the inner lid 11 in contact with the decompression packing 202 is also very small. In addition, restrictions on the arrangement of the pressure regulating section 20 including the decompression packing 202 are alleviated, and the degree of freedom in arranging the pressure regulating section 20 can be maintained.

In addition, the inner lid 11 having a protrusion 112 that is deeply squeezed from the inner lid 11 toward the inside of the pot 3 and protrudes therefrom and has a large protrusion 112 arranged at the center of the inner lid 11 is integrated with the lid body 2 side. Even in the case of such a structure, the decompression packing 202 has a structure that allows a small expansion and contraction stroke. Further, the hole 111 of the inner lid 11 and the opening 203 of the decompression packing 202 can be arranged at proper positions, and the same effect of facilitating assembly can be obtained.

<Modification 2>
FIG. 8 is an enlarged longitudinal sectional view showing the vicinity of the pressure regulating portion 20 of the inner lid 11 according to Modification 2 of Embodiment 1 of the present invention. Here, the same items as those of the above-described embodiment are omitted, and the characteristic portions thereof will be described.

In FIG. 8, the thin inner lid 11 is provided with an upwardly extending portion 115 so that the mouth portion 203 of the vacuum packing 202 can be placed in a more appropriate position. That is, an upwardly extending portion 115 is formed at the edge of the hole 111, which is a through hole, so as to extend upward so that the mouth portion 203 of the decompression packing 202 is fitted. Then, the mouth portion 203 of the decompression packing 202 is fitted into the upwardly extending portion 115 .

Thereby, the misalignment between the mouth portion 203 and the hole 111 is allowed by the length of the upwardly extending portion 115 . In addition, when the pressure inside the decompression packing 202 is less than the atmospheric pressure and gradually decreases, it is possible to prevent the passage inside the pipe from being clogged due to the collapse of the cylindrical portion of the decompression packing 202. It can maintain its shape.

If the structure or the position of the upwardly extending portion 115 near the pressure adjusting portion 20 is determined, the decompression packing 202a with a long expansion stroke of the modified example 1 can be used, and the decompression packing 202a with a long overall length can be reused. can be done.

<Modification 3>
FIG. 9 is an external perspective view showing an inner lid 11 according to Modification 3 of Embodiment 1 of the present invention. Here, the same items as those of the above-described embodiment are omitted, and the characteristic portions thereof will be described.

As shown in FIG. 9, the convex portion 112 provided on the inner lid 11 may have a Y-shape that is deeply drawn and extruded. The Y-shaped protrusion 112 has three branches 112b. Even with the Y-shaped protrusion 112, the rigidity and strength of the inner lid 11 itself can be increased, and the inner lid 11 is elastically deformed when the internal pressure of the pan 3 is gradually reduced below atmospheric pressure. Subduction due to is reduced. In addition, when the Y-shaped protrusion 112 is used, the step 116 of the inner lid 11 occupies a smaller proportion of the inner lid 11 , and the installation restrictions when the pressure adjusting portion 20 and the like are disposed on the inner lid 11 are reduced. As described above, the smaller the area of the step 116 resulting from the shape processing of the convex portion 112 of the inner lid 11 , the less restrictions are placed on the arrangement of the holes 111 formed in the inner lid 11 .

Similarly, the convex portion 112 that is deeply drawn and extruded may have an extruded shape other than the cross shape or the Y shape. This also increases the rigidity and strength of the inner lid 11 and suppresses the inner lid 11 from sinking due to elastic deformation. For example, the convex portion 112 may have a circular or elliptical shape that is deeply squeezed and protruded. According to this, even in the pressure cooker 100 having a complicated outer shape, the inner lid 11 can ensure stable sealing performance.

<Effect of Embodiment 1>
According to Embodiment 1, the pressure cooker 100 includes an inner lid 11 that is provided on the lid body 2 at the top of the main body 1 and covers the upper opening of the pot 3 that is housed in the main body 1 and into which the food to be cooked is put. Prepare. The pressure cooker 100 includes a heating coil 8 as heating means. The inner lid 11 is formed with a convex portion 112 protruding vertically from a basic plane portion 114 parallel to the upper opening of the pot 3 .

According to this configuration, the rigidity of the inner lid 11 itself is increased by the protrusions 112 . Therefore, when the internal pressure of the pan 3 is less than the atmospheric pressure and gradually decreases, the inner lid 11 can be prevented from sinking due to elastic deformation. can be stably sealed by the vacuum packing 202. In addition, the inner lid 11 can be made thin and light, and the assembly of the inner lid 11 to the lid body 2 is facilitated. Furthermore, since the rigidity and strength of the inner lid 11 are increased, the decompression state inside the pot 3 can be pulled up to vacuum, and the function and performance of the pressure cooker 100 are improved. As a result, foods that could not be cooked until now can be processed by the pressure cooker 100, and the range of cooking processing is expanded, so that the range of cooking by the pressure cooker 100 can be expanded.

According to Embodiment 1, convex portion 112 is a convex plane portion that protrudes from basic plane portion 114 by the same amount.

According to this configuration, the rigidity and strength of the inner lid 11 can be enhanced by the protrusions 112 that uniformly protrude from the basic plane portion 114 and form convex plane portions. As a result, the shape of the inner lid 11 is not excessively deformed, and the rigidity and strength of the inner lid 11 can be increased while improving the design.

According to Embodiment 1, the protrusion 112 includes the center O of the inner lid 11 and is formed point-symmetrically with respect to the center O of the inner lid 11 .

According to this configuration, the rigidity and strength can be enhanced by the protrusions 112 that are point-symmetrical with respect to the center O of the inner lid 11 with the center O of the inner lid 11 as a base point. As a result, the rigidity and strength of the inner lid 11 can be increased while enhancing the design of the shape of the inner lid 11 .

According to Embodiment 1, the convex portion 112 has a central portion 112a including the center O of the inner lid 11 and a plurality of four branch portions 112b extending radially outward from the central portion 112a.

According to this configuration, the rigidity and strength can be enhanced by the convex portion 112 having the central portion 112a and the plurality of four branch portions 112b from the center O of the inner lid 11 to the outer peripheral side of the inner lid 11 . As a result, the rigidity and strength of the inner lid 11 can be increased while enhancing the design of the shape of the inner lid 11 . In addition, the width of the basic plane portion 114 of the inner lid 11 is increased even with the provision of the convex portion 112, so that the degree of freedom in the installation locations of the decompression packing 202 and the holes 111 arranged on the basic plane portion 114 is increased.

According to Embodiment 1, the plurality of four branch portions 112b are radially formed at equal intervals in the circumferential direction of the inner lid 11 .

According to this configuration, the rigidity and strength can be evenly increased in the circumferential direction by the convex portion 112 having the central portion 112a and the plurality of four branch portions 112b from the center O of the inner lid 11 to the outer peripheral side of the inner lid 11. . As a result, the rigidity and strength of the inner lid 11 can be uniformly increased in the circumferential direction while enhancing the design of the shape of the inner lid 11 . In addition, the width of the basic plane portion 114 of the inner lid 11 is increased even with the provision of the convex portion 112, so that the degree of freedom in the installation locations of the decompression packing 202 and the holes 111 arranged on the basic plane portion 114 is increased.

According to Embodiment 1, the plurality of four branch portions 112b extend radially outward with the same width.

According to this configuration, the rigidity and strength can be evenly increased in the circumferential direction by the convex portion 112 having the central portion 112a and the plurality of four branch portions 112b from the center O of the inner lid 11 to the outer peripheral side of the inner lid 11. . As a result, the rigidity and strength of the inner lid 11 can be uniformly increased in the circumferential direction while enhancing the design of the shape of the inner lid 11 . In addition, the width of the basic plane portion 114 of the inner lid 11 is increased even with the provision of the convex portion 112, so that the degree of freedom in the installation locations of the decompression packing 202 and the holes 111 arranged on the basic plane portion 114 is increased.

According to Embodiment 1, convex portion 112 is formed in step 116 which is an R-processed portion in which a portion connected to basic flat portion 114 is chamfered.

According to this configuration, the convex portion 112 draws a clean curve and is connected to the basic flat portion 114, and the rigidity and strength of the inner lid 11 can be increased while enhancing the design of the shape of the inner lid 11. - 特許庁In addition, no narrow corners are formed between the basic plane portion 114 and the convex portion 112, and the cleaning of the inner lid 11 is facilitated.

According to Embodiment 1, the protrusion 112 protrudes downward toward the inside of the pot 3 .

According to this configuration, in particular, water droplets adhering to the lower surface of the inner lid 11 are returned to the central portion of the pot 3 from the convex portion 112 including the center O of the inner lid 11, and the water droplets are concentrated on the food to be cooked. It does not return to the target, and the food to be cooked is uniformly delicious.

According to Embodiment 1, pressure cooker 100 includes decompression packing 202 arranged on the outer surface of inner lid 11 . The decompression packing 202 is arranged at the position of the basic plane portion 114 other than the convex portion 112 .

According to this configuration, the decompression packing 202 is not arranged at the position of the convex portion 112 whose shape changes, and the function of closely contacting the inner lid 11 can be satisfactorily exhibited.

According to Embodiment 1, holes 111, which are through-holes, are formed at positions where decompression packing 202 is arranged in inner lid 11 . An upwardly extending portion 115 is formed at the edge of the hole 111, which is a through hole, so as to extend upward so that the mouth portion 203 of the decompression packing 202 is fitted.

According to this configuration, the decompression packing 202 can satisfactorily exhibit the function of closely contacting the inner lid 11 even if the inner lid 11 sinks slightly due to elastic deformation.

Embodiment 2.
<Elliptical inner lid 11>
FIG. 10 is an external perspective view showing an elliptical inner lid 11 according to Embodiment 2 of the present invention. Here, the same items as those of the above-described embodiment are omitted, and the characteristic portions thereof will be described.

As shown in FIG. 10, the inner lid 11 has an elliptical shape. An elliptical inner lid 11 covers the upper opening of the elliptical pot 3 . In the circular inner lid 11, the inner lid 11 sinks evenly in a decompressed state when the internal pressure of the pot 3 gradually decreases below the atmospheric pressure, and the inner lid 11 tries to deform evenly. However, in the elliptical inner lid 11, the force is applied unevenly, and the deformation of the inner lid 11 is also uneven.

Here, the convex portion 112 is formed line-symmetrically with respect to the major axis 117 a and the minor axis 117 b of the elliptical inner lid 11 . A plurality of four branch portions 112b are radially formed between the major axis 117a and the minor axis 117b of the elliptical inner lid 11 .

In this manner, the protruding portion 112 of the elliptical inner lid 11 is formed in an X shape that is deeply drawn and extruded. As a result, the strength and rigidity of the elliptical inner lid 11 can be increased and the sinking of the inner lid 11 can be suppressed when the internal pressure of the pot 3 is reduced below the atmospheric pressure. In addition, the pressure applied to the inner lid 11 can be dispersed, and the elliptical inner lid 11 can be evenly deformed. In addition, since the deformation of the elliptical inner lid 11 can be maintained evenly, the inner lid 11 has an advantageous structure for fitting or sealing with the pot 3 .

Further, the sinking of the elliptical inner lid 11 is reduced. As a result, the stroke of elastic deformation of the decompression packing 202 can be reduced, and the decompression packing 202 can be stably sealed. In addition, the flexibility of the position where the pressure regulating part 20 is arranged inside the lid body 2 is increased, and it becomes easy to mount the decompression packing 202 inside the lid body 2 . Furthermore, since the rigidity and strength of the elliptical inner lid 11 are increased, the thickness of the inner lid 11 can be reduced and the weight of the inner lid 11 can be reduced.

Since the elliptical inner lid 11 is lightweight, the lid packing 12 and the packing support 13 can be easily assembled to the inner lid 11 in terms of assembly workability. In addition, the assembled elliptical inner lid 11 can be easily attached to the lid body 2 . In addition, the opening and closing operation of the lid body 2 becomes easier.

<Modification 4>
FIG. 11 is an external perspective view showing an elliptical inner lid 11 according to Modification 4 of Embodiment 2 of the present invention. Here, the same items as those of the above-described embodiment are omitted, and the characteristic portions thereof will be described.

As shown in FIG. 11, the convex portion 112 of the inner lid 11 may have a deeply drawn and extruded H-shape. The central portion 112a is formed to be larger in size on the long axis 117a side of the elliptical inner lid 11 than on the short axis 117b side. The H-shaped convex portion 112 can increase the rigidity and strength of the inner lid 11 itself. As a result, sinking due to elastic deformation of the inner lid 11 is reduced in a decompressed state when the internal pressure of the pan 3 is gradually reduced below the atmospheric pressure. Furthermore, with the H-shaped convex portion 112, the proportion of the step 116 in the central portion of the inner lid 11 is reduced, and installation restrictions when arranging the pressure regulating portion 20 and the like on the inner lid 11 are reduced.

It should be noted that an extruded shape other than the above-described X-shape or H-shape may be used as long as the protruding portion 112 that is similarly deeply drawn and extruded can be formed. This also increases the rigidity and strength of the inner lid 11 and suppresses the inner lid 11 from sinking due to elastic deformation.

Here, the radial outer end portion 112 c of the convex portion 112 is connected to the edge portion 113 of the inner lid 11 . This prevents stress from concentrating on the end portion 112c of the convex portion 112 when the internal pressure of the pot 3 is in a decompressed state when it is gradually reduced below the atmospheric pressure. Further, the rigidity and strength of the inner lid 11 can be increased, and the plate thickness of the inner lid 11 can be reduced. Therefore, the sinking of the inner lid 11 is reduced, the elastic deformation stroke of the decompression packing 202 can be similarly reduced, and the decompression packing 202 has stable sealing performance. If the end portion 112c of the convex portion 112 and the edge portion 113 are connected to each other, the plate material can be easily stretched even when the convex portion 112 is pushed out deeply. The inner lid 11 connecting the end portion 112c of the convex portion 112 and the edge portion 113 can be applied to the end portion 112c of any of the convex portions 112 in the above embodiments, and has the same effect.

In addition, if the mounting structure inside the lid 2 has an extra space, the convex portion 112 has a convex shape that squeezes and pushes out deeply in the direction opposite to the inside of the pot 3, that is, a convex shape that pushes out greatly and deeply toward the lid 2 side. may be formed. As a result, the rigidity of the inner lid itself can be increased, and sinking due to elastic deformation of the inner lid 11 can be reduced when the internal pressure of the pan 3 is gradually reduced below the atmospheric pressure. As a result, the stroke of elastic deformation of the decompression packing 202 can be reduced, and the decompression packing 202 can obtain stable sealing performance. Furthermore, the thickness of the inner lid 11 can be reduced, and the weight of the inner lid 11 can be reduced.

Since the inner lid 11 is lightened in this manner, the lid packing 12 and the packing support 13 can be easily assembled to the inner lid 11 . Also, the assembled inner lid 11 can be easily attached to the lid body 2 . In addition, the opening and closing operation of the lid body 2 becomes easier.

<Effect of Embodiment 2>
According to Embodiment 2, the inner lid 11 is elliptical. The convex portion 112 is formed line-symmetrically with respect to the major axis 117 a and the minor axis 117 b of the elliptical inner lid 11 .

According to this configuration, even with the elliptical inner lid 11 , the rigidity and strength can be increased by the projections 112 formed line-symmetrically with respect to the major axis 117 a and the minor axis 117 b of the inner lid 11 . As a result, the rigidity and strength of the inner lid 11 can be increased while enhancing the design of the shape of the inner lid 11 .

According to Embodiment 2, the plurality of four branch portions 112b are radially formed between the major axis 117a and the minor axis 117b of the elliptical inner lid 11 .

According to this configuration, even in the case of the elliptical inner lid 11, the convex portion 112 having the plurality of four branch portions 112b radially formed between the major axis 117a and the minor axis 117b of the inner lid 11 can be used. increases the rigidity strength almost equally in the circumferential direction. As a result, the rigidity and strength of the inner lid 11 can be increased substantially equally in the circumferential direction while enhancing the design of the shape of the inner lid 11 . In addition, the width of the basic plane portion 114 of the inner lid 11 is increased even with the provision of the convex portion 112, so that the degree of freedom in the installation locations of the decompression packing 202 and the holes 111 arranged on the basic plane portion 114 is increased.

According to Embodiment 2, the central portion 112a is formed to be larger in size on the long axis 117a side of the elliptical inner lid 11 than on the short axis 117b side.

According to this configuration, the rigidity and strength of the inner lid 11 can be effectively increased according to the elliptical shape while enhancing the design of the elliptical inner lid 11 .

According to the second embodiment, the radially outer terminal portion 112 c of the convex portion 112 is connected to the edge portion 113 of the inner lid 11 .

According to this configuration, by connecting the radially outer end portion 112c of the convex portion 112 to the edge portion 113 of the inner lid 11, when the internal pressure of the pot 3 is less than the atmospheric pressure and gradually decreases, , the stress concentrated on the end portion 112c can be prevented. As a result, the rigidity and strength of the inner lid 11 can be increased, and the convex portion 112 can be easily extruded for processing.

According to Embodiment 2, the convex portion 112 protrudes upward toward the outside of the pan 3 .

According to this configuration, the rigidity of the inner lid 11 itself can be increased by the protrusion 112 projecting upward.

It should be noted that the above embodiments may be implemented in combination as much as possible.

REFERENCE SIGNS LIST 1 main body 2 lid 3 pot 4 hinge 5 upper frame 6 locking button 7 pot housing portion 8 heating coil 9 outer lid 10 lower lid 11 inner lid 12 lid packing 13 packing support , 20 pressure regulating portion, 31 flange portion, 32 cylinder portion, 33 curved surface portion, 100 pressure cooker, 111 hole, 112 convex portion, 112a center portion, 112b branch portion, 112c end portion, 113 edge portion, 114 basic plane portion , 115 upward extension portion, 116 step, 117a long shaft, 117b short shaft, 201 solenoid valve, 202, 202a decompression packing, 203, 203a mouth portion.

Claims (16)

An inner lid that is provided on a lid on the top of a main body and covers an upper opening of a pot that is housed in the main body and into which food to be cooked is put, and a heating means,
The inner lid protrudes vertically downward or upward from a basic plane portion parallel to the upper opening of the pot, and is elastically deformed when the internal pressure of the pot is reduced. Protrusions that suppress subduction are formed,
The convex portion includes a central portion including the center point of the inner lid, and a plurality of branch portions communicating with the central portion and radially formed in a direction from the central portion toward the edge of the inner lid. have
The inner lid has an elliptical shape,
The convex portion is formed line-symmetrically with respect to the long axis and the short axis of the elliptical inner lid,
the plurality of branches are radially formed between the long axis and the short axis of the elliptical inner lid,
The central portion is formed such that the size of the long axis side of the elliptical inner lid is larger than the size of the short axis side.
pressure cooker. A vacuum packing disposed on the outer surface of the inner lid,
The pressure cooker according to claim 1 , wherein the decompression packing is arranged at a position of the basic plane portion other than the convex portion. An inner lid that is provided on a lid on the top of a main body and covers an upper opening of a pot that is housed in the main body and into which food to be cooked is put, and a heating means,
The inner lid protrudes vertically downward or upward from a basic plane portion parallel to the upper opening of the pot, and is elastically deformed when the internal pressure of the pot is reduced. Protrusions that suppress subduction are formed,
The convex portion includes a central portion including the center point of the inner lid, and a plurality of branch portions communicating with the central portion and radially formed in a direction from the central portion toward the edge of the inner lid. have
A vacuum packing disposed on the outer surface of the inner lid,
The decompression packing is arranged at a position of the basic plane portion other than the convex portion.
pressure cooker. The inner lid has a circular shape,
4. The pressure cooker of claim 3 , wherein the plurality of branches of the projection extend radially outwardly from the central portion. 5. The pressure cooker according to claim 4, wherein the plurality of branches are radially formed at equal intervals in the circumferential direction of the inner lid. The inner lid has an elliptical shape,
4. The pressure cooker according to claim 3 , wherein the convex portion is formed line-symmetrically with respect to the long axis and the short axis of the elliptical inner cover. 7. The pressure cooker according to claim 6, wherein the plurality of branches are radially formed between the long axis and the short axis of the elliptical inner cover. 8. The pressure cooker according to claim 6 or 7, wherein the central portion is formed so that the major axis side of the elliptical inner lid is larger than the minor axis side thereof. A through-hole is formed at a location where the vacuum packing is arranged in the inner lid,
The edge portion of the through hole is formed with an upwardly extending portion extending upward so that the mouth portion of the decompression packing is fitted therein. pressure cooker. 10. The pressure cooker according to any one of claims 1 to 9, wherein the convex portion is a convex flat portion projecting by the same amount from the basic flat portion. The pressure cooker according to any one of claims 1 to 10, wherein the convex portion includes the center of the inner lid and is formed point-symmetrically with respect to the center of the inner lid. The pressure cooker according to any one of claims 1 to 11 , wherein the plurality of branch portions extend outward from the central portion with the same width. 13. The pressure cooker according to any one of claims 1 to 12 , wherein the convex portion is formed in an R-processed portion having a chamfered portion connected to the basic flat portion. 14. An end portion of the branch portion is connected to the edge portion of the inner cover or is spaced apart from the edge portion of the inner cover. pressure cooker as described in . 15. The pressure cooker according to any one of claims 1 to 14 , wherein the projection projects downward toward the inside of the pot. The pressure cooker according to any one of claims 1 to 14 , wherein the projection projects upward toward the outside of the pot.

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