JP7323923B2 - Thermal cooker - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat-retaining cooker used for heat-retaining cooking in which food is heated and then kept warm to finish cooking using residual heat.

A cooker as described above is disclosed in Patent Document 1 below. It is composed of a cooking pot that serves as an inner container, an inner lid that closes the opening of the cooking pot, a heat insulating container that serves as an outer container, and an outer lid that closes the opening of the heat insulating container. Although the cooking pot is provided with a handle, only the handle is configured to protrude from the outer container when the cooking pot is housed in the heat insulating container.

In this way, the cooker has a configuration in which the inner container is housed inside the outer container, the lid of the inner container is fitted to the container of the inner container, and the lid of the outer container is fitted to the container of the outer container. there were. In addition, since the outer container, which is a vacuum-insulated container made of stainless steel, and the inner container are also made of metal, the cooking pot cannot be heated in a microwave oven. In other words, a simple microwave oven could not be used for heat-retaining cooking.

In this regard, there is a cooker disclosed in Patent Document 2 below, which states that heating can be performed with a microwave oven.

This cooker comprises a cooking container made of a microwave permeable material, a lid provided at an upper opening of the cooking container, and heat insulation between an inner wall and an outer wall detachably arranged around the outer periphery of the cooking container. It consists of an insulated container with layers and a bottom wall. In the cooker with such a configuration, food is placed in the cooking container, the lid is closed, the cooking container is stored in the heat insulating container, and the food is heated in the microwave oven. After heating, keep it warm to complete the cooking.

However, the heat-insulating container is not entirely made of stainless steel vacuum heat-insulating container, so the heat-insulating property is not high.

FIG. 7 of Patent Document 2 discloses an example in which the lid that closes the upper opening of the cooking container is composed of an inner lid and an outer lid, and the outer peripheral edge of the outer lid overlaps the outer peripheral edge of the inner lid. , Neither the inner lid nor the outer lid has heat insulation, and the heat insulation is not high.

JP-A-2001-87143 Japanese Patent No. 5142070

A main object of the present invention is to enable sufficient and reliable heat retention cooking using a microwave oven.

Means therefor is a heat-retaining cooker comprising an inner container for containing foodstuffs and an outer container having heat retention properties for accommodating the inner container, wherein the inner container is a microwave-heatable container having an opening on the upper surface. and a microwave-heatable lid that closes the opening of the container, and the outer container surrounds a portion below the upper end of the container and has heat insulating properties, and the opening of the container. A lower inner fitting portion in which the lid is fitted and an upper inner fitting portion in which the outer lid is fitted are arranged in order from the bottom on the inner periphery of the upper end of the container. The heat-retaining cooker is arranged such that the upper inner fitting portion is formed in a vertical direction below a position corresponding to the upper end of the exterior container covering the container.

In this configuration, the inner container, which is closed with the lid after the food is put into the container, is heated in a microwave oven, and after the food is heated, it is stored in the exterior container of the outer container and the exterior lid is fitted to keep it warm. be. The outer cover is fitted in the upper inner fitting part above the lid fitted in the lower inner fitting part of the container, and is fitted below the upper end position of the outer container.

According to this invention, it is possible to improve the heat retention of the outer container with respect to the inner container by the lower inner fitting portion and the upper inner fitting portion of the container of the inner container. As a result, sufficient heat-retaining cooking can be reliably performed using the microwave oven.

Sectional drawing of a heat-insulating cooker. A perspective view of a heat-retaining cooker. FIG. 2 is a perspective view of the heat-retaining cooker in a separated state; FIG. 1 is a sectional view of one side of the heat-retaining cooker in a separated state. Bottom view of container. Sectional drawing of an outer container. Sectional drawing of the action state of an inner container. Partial cross-sectional front view showing a stage before heat retention.

One mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of a heat-retaining cooker 11. As shown in FIG. This heat-retaining cooker 11 is composed of an inner container 12 for containing foodstuffs and an outer container 13 for accommodating the inner container 12 and having a heat retaining property. In use, after the whole inner container 12 is placed in the microwave oven to heat the food material, the inner container 12 is placed in the outer container 13 to keep it warm, and the cooking is finished.

2 is a perspective view of the heat-retaining cooker 11, FIG. 3 is a perspective view of the heat-retaining cooker 11 in its separated state, and FIG. As shown in these figures, the heat-retaining cooker 11 looks like one pan when assembled, and is divided into four members when separated. The four members are the container 21 and the lid 31 that constitute the inner container 12 and the exterior container 41 and the exterior lid 51 that constitute the outer container 13 .

The inner container 12 is made entirely of a microwave-transmissive material that can be heated in a microwave oven. Materials that can be heated in a microwave oven include synthetic resins. Suitable synthetic resins include, for example, polypropylene. The inner container 12 may be made of synthetic resin, or may be made of glass, ceramics, or the like. The inner container 12 is composed of two members, the container 21 and the lid 31, as described above.

The container 21 has a bottomed cylindrical shape with an opening on the top surface. Specifically, the container 21 has a circular cross section and has a body portion 22 having a bottom and an upper end portion 23 integrally formed on the body portion 22 .

The body part 22 is a part into which foodstuffs are placed, and has the necessary volume. The body portion 22 has substantially the same diameter from the upper end to the lower end. A ring-shaped support rib 22a is vertically provided on the lower surface of the body portion 22, that is, the lower surface of the bottom of the container 21. The support rib 22a contacts when placed on a table or the like. A notch 22b is formed in a part of the support rib 22a, and air can flow inside and outside through the notch 22b when the support rib 22a is in contact with the upper surface of the table or the like.

The upper end portion 23 has a shape that expands in the outer peripheral direction from the upper end of the body portion 22 and extends upward, and has an annular plate-like upper end surface portion 24 at the upper end edge. The upper end surface portion 24 is a portion that covers the upper end 42 of the outer container 41 that houses the container 21, that is, the portion that forms the uppermost opening. The width (length in the radial direction) of the upper end face portion 24 is wider than the corresponding portion of the upper end 42 of the outer casing 41 .

The lower end of the inner periphery of the upper end portion 23 has a flat lower stage inner fitting portion 25 having an appropriate width. The lower inner fitting portion 25 is a portion to which the lid 31 is fitted, strictly speaking, a portion on which the lid 31 is placed. At a position appropriately lower than the upper end surface portion 24 located at the upper end of the upper end portion 23, a flat upper stage inner fitting portion 26 having an appropriate width is formed. The upper inner fitting portion 26 is a portion to which the exterior lid 51 is fitted, strictly speaking, the portion on which the exterior lid 51 is placed.

Between the upper inner fitting portion 26 and the lower inner fitting portion 25, a slanted portion 27 whose diameter decreases toward the bottom is formed. The slope portion 27 may have a linear cross-sectional shape in the vertical direction, or may have a curved shape that is concave downward or a curved shape that is convex upward. Preferably, the inclined surface portion 27 has an upwardly convex curvilinear cross section, as shown in the illustrated example. This is because the lid body 31 which is lowered or lowered from above fits well, and the ingredients that are about to rise are easily recovered.

A substantially vertical rising wall 28 connected to the upper inner fitting portion 26 is continuously provided on the slope portion 27 .

The distance between the upper inner fitting portion 26 and the upper end surface portion 24 is such that the exterior lid body 51 is sufficiently fitted and stabilized, and the outer lid body 51 fitted in the upper inner fitting portion 26 is attached to the exterior container 41 . It is set at a position where it can be dropped below the height of the upper end 42 . Since the upper end face portion 24 is formed in a plate shape and covers the upper end 42 of the outer casing 41 as described above, the height of the upper inner fitting portion 26 easily corresponds to the upper end 42 of the outer casing 41. can be lower than the required height.

As described above, the lower inner fitting portion 25 in which the lid 31 is fitted and the upper inner fitting portion 26 in which the outer lid 51 is fitted are arranged in order from the bottom on the inner circumference of the upper end portion 23 of the container 21. The formation position of the upper inner fitting portion 26 in the direction is below the position corresponding to the upper end 42 of the exterior container 41 covering the container 21 .

Handles 29 projecting in the outer peripheral direction are integrally formed at two opposite locations on the upper end face portion 24 of the container 21 . The two locations are both end portions of a portion corresponding to a diameter passing through the imaginary center of the container 21 in plan view. The handle 29 is formed in a triangular shape that draws a large arc in a plan view, and the entire upper end surface portion 24 of the container 21 is formed in a shape close to an ellipse.

An annular rib 24a extending downward from the upper end 42 of the outer container 41 is formed on the lower surface of the upper end surface portion 24, on the outer peripheral side of the upper end 42 of the outer container 41 as shown in FIG. FIG. 5 is a bottom view of the container 21. As shown in this figure, in addition to the annular rib 24a, an appropriate necessary rib 24b is formed on the handle 29 portion.

A lid 31 for closing the opening of the container 21 is disc-shaped and has a knob 32 in the center of the upper surface. The knob 32 has a generally cylindrical shape as a whole, and its diameter increases toward the top.

An outer peripheral edge portion 31a of the lid body 31 is a portion placed on the lower inner fitting portion 25 of the upper end portion 23 of the container 21, and a peripheral wall portion 33 extending downward is formed. Since the cross-sectional shape of the slope portion 27 facing the peripheral wall portion 33 is curved upward, the peripheral wall portion 33 is slightly inclined in the inner peripheral direction. An outer peripheral surface 33a of the peripheral wall portion 33 is formed with an inclined surface that inclines toward the inner periphery toward the bottom. and the slope portion 27 of the container 21 .

Further, the peripheral wall portion 33 is formed with a communicating portion 33b that communicates the space covered by the lid 31 with the outside. There are two opposing communicating portions 33b, and the shape of the communicating portion 33b when viewed from the front is substantially semicircular.

The outer peripheral edge portion 31a having the peripheral wall portion 33 in the lid body 31 and the portion 31b having the knob 32 on the inner peripheral side of the outer peripheral edge portion 31a are formed to be different in level. is formed above the portion 31b on the inner peripheral side. In other words, the portion on the central side is formed to be pushed down below the outer peripheral edge portion 31a.

Since the lid 31 has the shape described above, it is formed by double molding in which the portion near the knob 32 and the other portions are formed separately. Therefore, the color and properties of the portion near the knob 32 and other portions can be made different as needed.

The exterior container 41 of the outer container 13 is a member that surrounds the portion below the upper end 23 of the container 21 of the inner container 12 and has heat insulation, and is made of metal, specifically stainless steel and has a vacuum double structure. . The exterior container 41 has a bottomed cylindrical shape with an opening on the upper surface, and has a body portion 43 having a circular cross section and a bottom, and an upper end portion 44 integrally formed on the body portion 43 .

The body portion 43 and the upper end portion 44 are portions into which the container 21 of the inner container 12 is inserted, and are formed to have a required size. The inner diameter and shape of the exterior container 41 are designed to minimize the gap between it and the container 21 to be accommodated. Extending in the direction and upward, the upper end 42 side of the upper end portion 44 rises vertically. An upper end 42 of the outer container 41 is a flat surface with an appropriate width.

The inner bottom surface of the body portion 43 is formed with a contact surface portion 43a with which the lower ends of the support ribs 22a formed on the lower surface of the container 21 of the inner container 12 come into contact.

The relationship between the container 21 in the vicinity of the upper end surface portion 24 of the container 21 and the container 21 when the lower end of the support rib 22a is in contact with the contact surface portion 43a is designed as follows. That is, when the support rib 22a contacts the contact surface portion 43a, a very small gap is formed between the lower surface of the upper end surface portion 24 of the container 21 and the upper end 42 of the exterior container 41. As shown in FIG. Further, the upper end 42 of the exterior container 41 is sandwiched between the inner and outer sides of the wall forming the upper inner fitting portion 26 and the annular rib 24a extending downward from the lower surface of the upper end face portion 24 with a small gap. The small gap mentioned above is set to take into account the expansion of the heated container 21 .

The exterior lid 51 of the outer container 13 is a member having heat insulation that closes the opening of the container 21 of the inner container 12 .

The exterior cover 51 is mainly made of a synthetic resin material and has a thick structure in which a heat insulating material 52 made of a foam material or the like is incorporated. A fitting portion 53 that fits into the upper inner fitting portion 26 is formed on the outer peripheral edge of the exterior lid body 51 . The height of the fitting portion 53 corresponds to the height from the upper inner fitting portion 26 to the upper end face portion 24 . A bulging portion 54 extending downward is formed on the lower surface on the inner peripheral side of the fitting portion 53 . The lower surface of the bulging portion 54 has a shape that conforms to the upper surface of the lid 31 placed on the container 21 . The gap between the lower surface of the bulging portion 54 and the lid 31 and slope portion 27 is designed to be as small as possible. A ceiling recess 54 a for accommodating the knob 32 of the lid 31 is formed in the center of the lower surface of the bulging portion 54 .

The upper surface of the exterior lid body 51 is formed to protrude upward, and has an upwardly protruding outer lid knob 55 in the central portion. A base side portion of the outer lid knob 55 is formed with a concave portion 56 that is slightly lowered in a circular shape in plan view. The outer lid knob 55 has a center column portion 55a and a disc-shaped portion 55b that extends over the entire circumference from the upper end of the column portion 55a. The upper portion of the disk-shaped portion 55b is covered with a decorative member 57 made of a metal member.

The exterior lid 51 can be placed on the upper inner fitting portion 26 of the container 21 of the inner container 12 as shown in FIG. 1 to close the opening. It is also a shape that allows you to close the opening by putting it on.

The heat-retaining cooker 11 configured as described above is used as follows.

First, an appropriate amount of food material is put into the container 21 of the inner container 12 and the lid 31 is closed. The entire inner container 12 is put into a microwave oven and heated.

As shown in FIG. 7, the heated steam is discharged through the communicating portion 33b formed between the container 21 and the lid 31 and the peripheral wall portion 33 of the outer peripheral edge portion 31a of the lid 31. As shown in FIG. Further, even when a liquid such as rice is soaked in water, the cover body 31 has a peripheral wall portion 33, and the peripheral wall portion 33 is inclined toward the inner periphery toward the lower end side. Therefore, the ejection of the liquid is suppressed. Even if the liquid rises, the liquid flows down from the slope portion 27 and returns through the communicating portion 33b.

After heating the food material, the inner container 12 is put into the outer container 13 as shown in FIG. That is, the inner container 12 taken out of the microwave oven is put into the exterior container 41 of the outer container 13 , and the outer lid 51 is placed over the container 21 of the inner container 12 .

Since the container 21 is formed with a handle 29 protruding in the outer peripheral direction from the upper end surface 24, the operation from taking it out of the microwave oven to putting it into the external container 41 is easy. Moreover, since the lid 31 of the container 21 rests on the lower inner fitting portion 25 located at the lower end of the upper end portion 23, it is positioned considerably lower than the upper end face portion 24, and there is no possibility that the steam will touch the hands. do not have.

When the container 21 of the inner container 12 is put into the outer container 41 , the support ribs 22 a of the container 21 come into contact with the contact surface portion 43 a of the outer container 41 . Therefore, the container 21 is stably accommodated, and even if the food material is heavy, it can be well supported, and the deformation of the container 21 can be suppressed. Moreover, the annular rib 24 a of the upper end surface portion 24 of the container 21 is fitted onto the upper end 42 of the external container 41 . Therefore, the stability of the container 21 inside the outer container 41 is good.

In addition, the space between the container 21 and the outer container 41 is small, and the container 21 is formed with an upper end surface portion 24, and the annular rib 24a on the lower surface of the upper end surface portion 24 and the upper end 42 of the outer container 41 are fitted to each other. Air circulation in the space is suppressed. Therefore, together with the fact that the exterior container 41 is made of metal and has a vacuum heat insulation structure, high heat retention can be obtained.

In addition, since the upper inner fitting portion 26 of the container 21 into which the outer cover 51 is fitted is located below the position corresponding to the upper end 42 of the outer container 41 covering the container 21, the thick outer cover 51 can be vertically moved. In the direction, it bites into the exterior container 41 . Moreover, the exterior cover 51 having the bulging portion 54 has a heat insulating effect even in the lower part in the vertical direction. This is facilitated by the fact that the outer peripheral edge portion 31a of the lid body 31 is formed higher than the portion 31b on the inner peripheral side of the outer peripheral edge portion 31a. From these things, a more sustainable high heat retention is obtained.

Since the outer lid 51 is also fitted to the upper end portion 44 of the outer container 41, for example, hot water is poured into the outer container 41 while the food is being heated, and the outer container 41 is closed with the outer lid 51 to preheat the inside of the outer container 13. This will give you even better heat retention.

Cooking using residual heat proceeds and completes due to such high heat retention.

As mentioned above, you can easily cook without using an open flame. Since it does not use an open flame, there is no need to adjust the heat and there is no failure.

In addition, as described above, due to the configuration of the lower inner fitting portion 25 and the upper inner fitting portion 26 in the container 21 of the inner container 12, etc., the outer container 13 can provide good heat retention for the inner container 12, so that the microwave oven can be used. Sufficient heat retention cooking can be reliably performed using

DESCRIPTION OF SYMBOLS 11... Thermal insulation cooker 12... Inner container 13... Outer container 21... Container 22a... Support rib 23... Upper end part 24... Upper end surface part 24a... Annular rib 25... Lower stage inner fitting part 26... Upper stage inner fitting part 27... Slope part DESCRIPTION OF SYMBOLS 29... Handle 31... Lid body 31a... Peripheral edge part 33... Surrounding wall part 33b... Communication part 41... Exterior container 42... Upper end 44... Upper end part 51... Exterior lid body

Claims (9)

A heat-retaining cooker comprising an inner container for containing foodstuffs and an outer container having heat retention properties for accommodating the inner container,
The inner container is composed of a microwave-heatable container having an opening on the upper surface and a microwave-heatable lid that closes the opening of the container,
The outer container is composed of an outer container that surrounds the lower portion from the upper end of the container and has heat insulation, and an outer lid that closes the opening of the container and has heat insulation,
A lower inner fitting portion to which the lid is fitted and an upper inner fitting portion to which the exterior lid is fitted are arranged in order from the bottom on the inner circumference of the upper end portion of the container,
A heat-retaining cooker, wherein the formation position of the upper inner fitting portion in the vertical direction is lower than the position corresponding to the upper end of the exterior container covering the container. 2. The heat-retaining cooker according to claim 1, wherein a sloped portion whose diameter decreases downward is formed between said upper inner fitting portion and said lower inner fitting portion. 3. The heat-retaining cooker according to claim 1, wherein an upper edge of said container is formed with an upper end face portion covering the upper end of said exterior container. 4. The heat-retaining cooker according to claim 3, wherein a handle projecting in the outer peripheral direction is integrally formed on the upper end face portion. 5. The heat retaining cooker according to claim 3 or 4, wherein an annular rib extending downward from the upper end of the exterior container is formed on the lower surface of the upper end surface portion on the outer peripheral side of the upper end of the exterior container. 6. The heat retaining cooker according to any one of claims 1 to 5, wherein a support rib is formed on the lower surface of the container and is in contact with the inner bottom surface of the exterior container. A peripheral wall portion extending downward is formed on the outer peripheral edge portion of the lid,
The heat retaining cooker according to any one of claims 1 to 6, wherein the peripheral wall portion is formed with a communicating portion that communicates the space covered by the lid with the outside. The outer peripheral edge of the lid and a portion on the inner peripheral side of the outer peripheral edge are formed to be uneven,
The heat retaining cooker according to any one of claims 1 to 7, wherein the outer peripheral edge portion is formed higher than a portion on the inner peripheral side of the outer peripheral edge portion. The heat-retaining cooker according to any one of claims 1 to 8, wherein the exterior lid is also fitted to the upper end portion of the exterior container.

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