JPH05111Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric pot that heats a liquid contained in a vacuum double container made of metal using a heating element.

[Prior Art] Conventionally, an electric pot was developed in 1982 as an electric pot that heated a liquid contained in a vacuum double container using a heating element.
An electric pot disclosed in Japanese Patent No. 34733 is known. As shown in FIG. 3, this electric pot has a heating element 82 that heats the liquid on the outer periphery of the bottom plate of a metal vacuum double container 81.
At the same time, a discharge passage 83 for spouting liquid to the outside is formed near the bottom of the vacuum double container 81, and a lid 85 is provided at the mouth 84 of the vacuum double container 81, and air is injected into the lid 85. Vacuum double container 81
It has a built-in bellows pump 86 that pumps the liquid under pressure to the discharge passage 8.
3 and can be discharged to the outside.

In addition, it is known that it is best to use boiled water for tea, coffee, etc. in terms of flavor, and for this reason, for example,
In the electric pot of the publication, a steam exhaust path is formed in the lid of a single container containing liquid, and a boiling control thermostat is provided in this steam exhaust path so that the liquid is boiled by the thermostat. Controls for heating elements are known.

By the way, volumetric expansion and bumping of the liquid must be taken into account in the container that holds the liquid, so the volume of the container at boiling is generally 20% of the rated capacity.
The size is required plus ~40% surplus space.

Therefore, in consideration of such surplus space inside the container, for example, in Japanese Utility Model Application Publication No. 177040/1983, a stopper is removably provided below the mouth of the inner container of the vacuum double container. An electric kettle for boiling water and keeping it warm was proposed, in which a recess is formed in the center of the stopper, and a suction pipe of the inner stopper passes through the recess. The plug attached to the mouth of the vacuum double container is made smaller in diameter than the upper plug through an upper plug that is screwed into the mouth and a spacer that forms a ventilation gap at the bottom of this upper plug. The upper and lower plugs are integrally connected with a screw, and the gasket provided on the upper end of the lower plug is used as a mouthpiece. The flexible tube is located near the bottom of the vacuum double container and presses into contact with an annular stepped portion smaller in diameter than the inner tube formed in the inner tube of the vacuum double container, and constitutes a steam venting mechanism in a recess provided on the lower surface of the lower stopper. A plug structure having a steam release mechanism equipped with a disc-shaped valve body has been proposed.

[Problem to be solved by the invention] In the above conventional example, the former Utility Model Application No. 177040
By forming a recess in the stopper, a certain amount of surplus space can be secured even if the maximum storage level of the liquid stored in the inner cylinder is near the mouth.
Since the stopper does not have a heat insulating function, the heat insulating properties at the mouth part are reduced and there is a problem with heat retention. Regarding this point, the latter, published in Utility Model Publication No. 59-43000,
A heat insulating material is provided to surround the recess in the lower stopper, and a heat insulating effect can be obtained at the mouth. A step portion is formed to protrude inward, and the step portion causes the mouth portion to taper, thereby reducing the effective volume of the vacuum double container. In addition, the structure is such that a recessed part is provided on the lower surface of the lower plug body, similar to the former Utility Model Application Publication No. 177040/1983, but the lower plug body is provided with a concave part that protrudes from the inner circumferential surface of the mouth part. The recess formed in the lower stopper, which is formed to have a small diameter so as to be inserted along the inner circumferential surface of the stepped portion, and has such a small diameter, cannot be set wide enough to ensure sufficient surplus space. Moreover, the recess is formed to collect the steam generated by heating the liquid contained in the vacuum double container, and to exhaust the steam to the outside from the valve body attached to the recess. Since the concave portion is formed in the lower plug body with a small diameter and the concave portion is a space for collecting steam, the concave portion cannot be structurally widened and sufficient surplus space cannot be secured by the concave portion. Furthermore, since the plug body is divided into an upper plug body and a lower plug body, and these upper plug bodies and lower plug bodies are integrally assembled with screws, the number of parts to be assembled is large, and the assembly process is difficult. inferior to sex. Furthermore, the stopper used in this type of electric pot is used in an environment where severe temperature changes from water to boiling are repeated, and prevention of thermal deterioration is also an issue.

The present invention solves these problems by reducing the heat conduction distance at the mouth of the lid in an electric pot that has a lid removably attached to the mouth of a metal double container equipped with a heating element. An object of the present invention is to provide an electric pot which can increase the length of the container, increase the effective volume including the surplus space of the metal double container, and prevent thermal deterioration of the lid.

[Means for Solving the Problems] The present invention provides a vacuum double container made of cylindrical metal with a mouth formed at the upper end, a heating element for heating a liquid provided in the vacuum double container, and the mouth. a lower part of the container is inserted into the lower part of the container, and a lid is detachably attached to the opening of the container, and the opening is formed into a wide-mouthed shape having a diameter that is approximately the same as the inner cylinder of the vacuum double container; A recess for extra space is formed on the lower surface of the body, excluding the outer periphery,
A heat insulating material is provided above the lower surface of the lid, and a metal cover is provided to cover the lower surface of the lid.

[Function] With the above configuration, the present invention has a wide-mouthed opening having approximately the same diameter as the inner cylinder, so that the vacuum double container has a cylindrical shape that rises vertically from the bottom of the inner cylinder and opens at the opening. , the effective volume of the vacuum double container can be increased. By making the mouth part wide-mouthed, the diameter of the lid that is removably attached to the mouth part can also be made large. By inserting the lid, the heat conduction distance between the lid and the periphery of the mouth can be increased, and excellent heat retention can be achieved. In addition, a recess with a wide space for surplus space can be formed on the lower surface side of the large-diameter lid, and the recess with this wide space can ensure sufficient surplus space and The metal cover that covers the lower surface of the body can prevent thermal deterioration of the lid.

[Example] Hereinafter, a first example of the present invention will be described based on FIGS. 1 and 2. In the figure, reference numeral 1 denotes a double vacuum container made of metal, and consists of an inner cylinder 2 and an outer cylinder 3, each having a bottom made of stainless steel. It has a cylindrical shape with an opening, and a vacuum layer 4 is provided between the inner cylinder 2 and the outer cylinder 3. The bottoms of the inner cylinder 2 and the outer cylinder 3 are connected by an (inverted cup)-shaped connecting member 5. The bottom surface of the connecting member 5 is brazed in contact with the bottom outer surface of the inner cylinder 2, and the mouth edge of the connecting member 5 penetrates the outer cylinder 3 and is brazed to the outer cylinder 3.

A plate-shaped heater 6 which is a heat generating body having a neck is provided inside the inner cylinder 2, and the neck of the heater 6 is passed through the inner cylinder 2 and the connecting member 5.
It is watertightly attached by a nut 7 screwed onto the neck. 8 is Patsuking. Note that the heater 6 is connected to a power source at a predetermined location.

In addition, a communication pipe 9 passing through the inner cylinder 2 and outer cylinder 3 is welded to a predetermined distance above the inner cylinder 2 and outer cylinder 3, and the other end thereof projects outside the outer cylinder 3. Both ends of the communication pipe 9 are gently tapered to a diameter slightly smaller than the middle part of the communication pipe 9, so that they can be easily fitted into the inner cylinder 2 and the outer cylinder 3 during manufacture, and are connected to the lower end of the communication pipe 9. It is made easy to fit into an elbow 10 which will be described later. 6A is a heat-retaining thermostat, and 11 is an exterior body that houses the vacuum double container 1.

A transparent glass pipe 14 rising upward is guided and connected to the communication pipe 9 via silicone rubber elbows 10 and 12 and a stainless steel pipe 13 so as to extend along the side surface of the outer cylinder 3. . A water stop mechanism 16 is connected to the upper end of the glass pipe 14 via a joint 15 above the water level L at the time of maximum storage of water W in the inner cylinder 2 .
And elbows 10 and 12, stainless steel pipe 1
3. A discharge path 18 is formed from the glass pipe 14 or the like to the spout 17. A water pipe 20 is connected to the upper end of the water stop mechanism 16 via an elbow 19 made of silicone rubber.
1 and opened downward.
is communicated with. Glass pipe 1 of exterior body 11
A window 21 made of transparent acrylic is provided at a position corresponding to 4, and the water level in the glass pipe 14, which indicates the amount of water in the inner cylinder 2, can be seen through this window 21.

Furthermore, a lid 23 made of synthetic resin is integrally formed on the mouth 22 of the vacuum double container 1 and is removably provided, and the lower surface 23A of the lid 23 is placed above the upper end of the mouth 22 of the vacuum double container 1. Form to position. In this case, the mouth portion 22 of the vacuum double container 1 is formed into a wide-mouth shape having approximately the same diameter as the inner cylinder 2. A male screw 25A is formed on the upper part of the outer circumferential surface 23B of the lid body 23 to be screwed into a female screw 25 formed on the inner circumferential surface near the upper edge of the outer casing 11, so that the lid body 23 is airtight through the packing 24. The lid body 23 is detachably attached to the mouth portion 22 as shown in FIG. Then, a recessed portion 26 for surplus space is formed in the lower surface 23A of the lid 23 to be inserted into the mouth portion 22, except for the area near the outer peripheral portion 23B. That is, a convex portion 26A is provided around the edge of the lower surface 23A of the lid body 23. A stainless steel cover 24B, which is a metal cover, is attached to the lower surface 23A of the lid 23 and the inner peripheral surface of the recess 26.

A base plate 27 is installed horizontally in the middle of the lid 23, a movable plate 28 is horizontally installed above the base plate 27, and a telescopic bellows serving as an air pump is installed between the movable plate 28 and the base plate 27 29 is provided, and this bellows 29 is provided with a return spring 30.
will be installed internally. Then, on the movable plate 28, a pusher body 31 in the shape of an inverted solid cylinder that appears on the upper surface of the lid body 23 is inserted into the recess 3.
2 so that it can move up and down. A spring 33 is interposed between the movable plate 28 and the pusher 31 and urges the pusher 31 upward. Further, a cylindrical body 34 is vertically provided at the center of the back surface of the pushing body 31, and an opening/closing body 35 is inserted into this cylindrical body 34 so as to be vertically movable. The opening/closing body 35 has a cylindrical shaft portion 36 at the top, and an opening/closing body 37 at the bottom, and the opening/closing body 37 is provided below the opening 22 . 37A is a packing that covers the opening/closing main body part 37. This opening/closing main body part 37 is
Located further down. Reference numeral 38 denotes an edge fixedly provided inside the lower end of the cylindrical body 34, and 39 denotes a locking protrusion formed outside the upper end of the cylindrical shaft portion 36 and capable of locking with the edge 38. Further, a pressing spring 40 is provided between the bottom of the cylindrical shaft portion 36 and the back surface of the pushing body 31.

Lower surface 23 of the lid body 23 provided below the mouth portion 22
One end is connected to the communication port 41 opened at A, and the other end is connected to the exhaust port 43 facing into the spout cover 42 to form a steam exhaust path 44. Furthermore, the communication port 4
An L-shaped partition wall 45 is formed above the partition wall 45, and a communication hole 46 for communicating the communication port 41 and the steam exhaust path 44 is formed in the horizontal part 45A of the partition wall 45, while a communication hole 46 is formed in the vertical wall 45B. Forms a ventilation hole 47 for communicating the inside of the bellows 29 and the communication hole 41, and further includes a substrate 27 facing the communication hole 46.
A guide hole 48 for guiding the opening/closing main body part 37 is provided at a location such that the communication hole 46 can be opened and closed. That is, the opening/closing main body part 37, the communication hole 46 and the ventilation hole 47
, the ventilation hole 47 is normally closed by the opening/closing main body 37 and the packing 37A, while the communication hole 4
6 opens to release steam. Conversely, when the pushing body 31 is pressed, the opening/closing main body 23 closes the communication hole 46 and opens the ventilation hole 47, so that air can be pumped into the vacuum double container 1 by compression of the bellows 29.

Further, a heat insulating material 49 such as polystyrene foam is provided near the lower surface 23A inside the lid body 23. This heat insulating material 49 is located below the mouth 22 of the vacuum double container 1. Further, a spout cover 4 facing the discharge port 43
Thermostat 50, which is a steam detector, is installed in the second part.
Install. Note that 51 is a stopper whose one end moves forward and backward so that it can be inserted into the lid body 23.

Next, the operation of the above structure will be explained.

After storing liquid water W in the inner cylinder 2 so that an excess space A remains, turn the lid body 23 and screw the screws 25 and 2.
Fix with 5A. In this state, since no steam is generated, the thermostat 50 senses the low temperature and supplies power to the heater 6 to heat the water W. Then, when steam S is generated after a while, this steam S passes through the communication hole 41, the communication hole 46, and the steam exhaust path 44, and is discharged from the exhaust port 43. This discharged steam S
When the thermostat 50 is heated, the generation of steam is detected by the temperature detection, and the heater 6 is controlled by cutting off the power or the like.

When the pusher body 31 is pressed in this boiling state, the opening/closing main body 37 and the packing 37A close the communication hole 46 and at the same time open the ventilation hole 47, and the compressed air generated by the compression of the bellows 29 flows through the ventilation hole 47,
It is forced into the inner cylinder 2 through the circulation hole 41. The forced air allows the boiling water W to pass through the discharger 18 and be poured into a cup or the like from the spout 17.

As described above, the inner cylinder 2 of the vacuum double container 1 has a continuous cylindrical shape from the bottom to the mouth 22, and the mouth 22
Since it has a wide mouth shape with almost the same diameter as the inner cylinder 2, the effective volume of the vacuum double container 1 can be increased, and the lower surface 23 of the lid body 23 provided with the heat insulating material 49 can be increased.
Since A is located below the opening 22 of the vacuum double container 1, the length (opening 2
The heat conduction distance H) in 2 can reduce the heat loss due to heat transfer, and in this embodiment, as explained earlier, since the opening 22 is wide-mouthed, the opening 22 can be detachably attached to the opening 22. Lid body 23 to be attached
Since the diameter of the heat transmission distance H becomes larger and the contact area between the mouth portion 22 and the lid body 23 during the heat transfer distance H becomes larger,
Since the contact area can be increased without making the heat conduction distance H longer than necessary, the vacuum double container 1
The volume of the lid body 23 corresponding to the heat conduction distance H that it occupies is kept small, and the above-mentioned mouth part 22 is made into a wide-mouthed shape with almost the same diameter as the inner cylinder 2. Together with this, the effective volume inside the vacuum double container 1 is reduced. It can be made larger and its heat retention ability can also be improved. Furthermore, by forming the recess 26 for surplus space on the lower surface 23A of the lid body 23 with a large diameter while leaving a portion near the outer circumference 23A, a wide cavity surrounded by the recess 26 is formed on the lower surface 23A of the lid body 23. The cavity B forms a part of the surplus space A, and even if the maximum storage level L of water W is near the mouth part 22, a sufficient surplus space A can be formed. The effective storage volume can be increased. In addition, the inner peripheral surface of the recess 26 and the lid body 23
Stainless steel cover 2 attached to the bottom surface 23A of
4B protects the lid body 23 from being exposed to severe temperature changes from water to boiling, and prevents thermal deterioration of the lid body 23. Since the lid body 23 is an integrally formed product, the above-mentioned Unlike the conventional example, the assembly work can be simplified without increasing the number of parts to be assembled. Furthermore, by providing the steam exhaust passage 44 and the thermostat 50 in the lid 23, boiling can be ensured.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but includes various modifications.

[Effects] The present invention consists of a cylindrical metal vacuum double container with a mouth formed at the upper end, a heating element for heating the liquid provided in the vacuum double container, and a lower part inserted below the mouth. and a lid removably attached to the mouth, the mouth is formed into a wide-mouth shape having a diameter approximately the same as the inner cylinder of the vacuum double container, and an excess space is provided on the lower surface of the lid. In addition to forming a concave portion for the purpose excluding the outer periphery,
By providing a heat insulating material on the upper part of the lower surface of the lid body and providing a metal cover covering the lower surface side of the lid body, the heat conduction distance at the mouth of the lid body is lengthened, and the metal double container is It is possible to provide an electric pot that can increase the effective volume and prevent thermal deterioration of the lid.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the first embodiment of the present invention;
FIG. 2 is a partially cutaway perspective view of the lid, and FIG. 3 is a longitudinal sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Vacuum double container, 2... Inner cylinder, 6... Heater (heating element), 22... Mouth part, 23... Lid body, 2
3A...Bottom surface, 24B...Stainless steel cover (metal cover), 26...Recess, 49...Insulating material, A...Excess space, W...Water (liquid).

Claims (1)

[Scope of utility model registration request] A vacuum double container made of cylindrical metal with a mouth formed at the upper end, a heating element for heating a liquid provided in the vacuum double container, and a lower part inserted below the mouth, a removably attached lid body, the diameter of the mouth portion is formed into a wide-mouthed shape that is approximately the same diameter as the inner cylinder of the vacuum double container, and a recessed portion for surplus space is provided on the lower surface of the lid body, excluding the outer periphery. What is claimed is: 1. An electric pot characterized by comprising: a heat insulating material on the upper part of the lower surface of the lid; and a metal cover covering the lower surface of the lid.