JP2008005950A - Electric hot water storage container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain energy saving for sufficiently exhibiting a heat insulation effect with a heat insulating material. <P>SOLUTION: A container body 1 is constituted by storing a vacuum double container as an inner container 3 in an outer case 2, an electric hot-water storage container has a lid body 13 opening and closing the opening 12 of the container body 1 together with the opening section 3a of the inner container 3, a heating source 11 heating the contained liquid in the inner container 3, and the vacuum heat insulating material 131 arranged around the outer periphery of the inner container 3, the above object is attained by providing a predetermined gap 201 between the vacuum heat insulating material 131 and the inner container 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes an inner container in an outer case to form a container, a lid that opens and closes the opening of the container together with the mouth of the inner container, a heating source that heats the content liquid in the inner container, The present invention relates to an electric hot water storage container provided with a vacuum heat insulating material provided around the outer side of the inner container, and is used, for example, in an electric pot for home use.

  Electric pots are widely used in homes, workplaces, canteens, etc., and are sometimes used all the time. On the other hand, high energy consumption by heaters in electric kettles has become an object of improvement as energy conservation is screamed in terms of environmental problems and resource conservation.

In view of this, a vacuum heat insulating material is provided around the outside of the inner container that heats the contained content liquid with a heating source and performs boiling and heat retention (see, for example, Patent Documents 1 to 3). Thus, since the thing of patent documents 1-3 encloses an inner container with a vacuum heat insulating material, heat retention is better than what is enclosed with a non-vacuum heat insulating material, and energy-saving property is improved correspondingly.
Japanese Patent No. 3513006 Japanese Patent No. 3596486 JP 2001-161565 A

  By the way, the vacuum heat insulating material as described above is obtained by covering the core material with an outer bag and making the inside vacuum, and the outer bag is a resin film, a resin / metal foil laminate film (for example, nylon / PET / aluminum foil / non-stretched). The core material is made of inorganic powder such as silica or pearlite, inorganic fiber such as glass wool, rigid urethane foam, or foamed phenol resin.

  However, the vacuum heat insulating material is in close contact with the inner container, and there is a large temperature difference between the inner container side and the outer case side, and the high temperature air heated around the inner side of the heating source, inner container, and vacuum heat insulating material. However, when it comes into contact with the low temperature outer case side part of the vacuum heat insulating material, there is a problem that condensation may occur and this may fall down and impair the function of the electrical component.

  In addition, vacuum insulation is sometimes damaged by external force during handling, such as when assembling, resulting in loss of the vacuum insulation effect. If such a product is difficult to be put on the market, it will be related to the trust of users. Therefore, a film in which a metal foil is laminated is often used for the outer bag. However, if the film is provided so as to be wrapped around the trunk of the inner container as described in Patent Documents 1 to 3, the heat of the inner container is a vacuum heat insulating material. It is transmitted directly to the outer bag, spreads to the inner container side with a metal foil layer, and tends to dissipate heat to the outside. For this reason, the heat insulation effect by the vacuum of a precious vacuum heat insulating material cannot be fully utilized for the improvement of heat retention.

  In addition, since the vacuum heat insulating material is in close contact with the inner container, it is difficult to fit a cylindrical shape that has been held in advance, the work efficiency is reduced, and the outer bag of the vacuum heat insulating material may be damaged. If the vacuum insulation material is wrapped around the inner container and attached, the work of assembling the inner container and other members becomes difficult and the vacuum insulation material may be damaged without the incidental work of maintaining the wound state. There is no problem.

  Furthermore, the vacuum heat insulating material described in Patent Document 1 is an example in which a heat insulating material is provided in the lid body only in combination with an inner container that is made of a metal that does not have heat insulating properties and has an open body while the body portion is straight. However, it is difficult to prevent upward escape of heat through the mouth of the inner container. In addition, since the vacuum heat insulating material is only disposed around the outer portion of the body portion of the inner container, it is not possible to prevent the heat that easily escapes from the upper and lower sides of the inner container from escaping in all directions.

  An object of the present invention is to provide an electric hot water storage container that can achieve energy saving by sufficiently exhibiting the heat insulating effect of the vacuum heat insulating material.

  In order to achieve the above-mentioned object, the electric hot water storage container of the present invention forms a container by housing a vacuum double container as an inner container in an outer case, and opens and closes the opening of the container together with the mouth of the inner container. And a heat source for heating the content liquid in the inner container, and a vacuum heat insulating material provided around the inner container, and a predetermined gap is provided between the vacuum heat insulating material and the inner container. It is characterized by that.

  In the electric hot water storage container having such a configuration, in the double vacuum insulation by the inner container itself which is a vacuum double container and the vacuum heat insulating material around the outer periphery, in a predetermined gap between the inner container and the vacuum heat insulating material. Air insulation is added to achieve exceptionally high heat insulation, while the vacuum insulation material retains heat as much as it does not escape heat from the inner container through the gap and escapes heat to the opposite side of the inner container. In addition, the temperature difference between the inner peripheral surface on the inner container side of the vacuum heat insulating material and the outer peripheral surface on the inner container side of the vacuum heat insulating material is reduced to avoid the problem of condensation on the outer peripheral surface of the vacuum heat insulating material. It is easy to avoid that the vacuum heat insulating material comes into contact with the inner container during assembly.

In addition to the first restricting part that restricts the radiation area from the inside of the inner container to the upper side of the heat by projecting to the inner diameter side of the mouth part narrowed smaller than the inner diameter of the inner part of the inner container which is a vacuum double container When the second restriction part is provided for restricting the radiation area around the side of the heat outside the mouth part of the inner container by extending the vacuum heat insulating material higher than the mouth part of the inner container,
In the range where the first restricting portion provided at the mouth of the inner container protrudes inward from the inner diameter of the inner body of the inner container, the heat dissipated upward in the inner container is blocked by the vacuum double structure. It is possible to restrict the heat radiation area upward from the inside through the mouth, and the mouth of the inner container is within a range in which the second restriction portion of the vacuum heat insulating material extends upward from the mouth of the inner container. It is possible to block heat radiated outside from the side by a vacuum heat insulating structure and limit the radiation area to the side of the heat outside the mouth of the inner container.

The inner container, which is a vacuum double container, has an annular convex part that extends the vacuum space downward than the heating source that hits the single bottom part, and lowers the vacuum heat insulating material below this annular convex part. By providing a third limiting portion that limits the heat radiation area from the heating source to the side by extension,
The inner container has a heat source at the bottom to prevent the vacuum double structure from interfering with the heating of the liquid contents and to reduce the heating efficiency. While the heat from the heating source is easily spread to the inside of the annular protrusion by the annular protrusion, the heat source and the heat source are within a range in which the third restriction portion of the vacuum heat insulating material extends downward from the annular protrusion. The heat dissipation from the inside of the annular protrusion to the side is blocked by a vacuum insulation structure, and the heat radiation area from the inside of the annular protrusion to the side of the heat is radiated. Can be limited.

When the amount B of upward protrusion with respect to the inner container that is the vacuum double container of the second restriction portion of the vacuum heat insulating material is set larger than the amount of protrusion A inside the first restriction portion of the inner container,
As the difference between the inner diameter D of the inner container and the inner container D of the inner container increases, the amount A of the inner container projecting toward the inside of the first restriction portion at the mouth of the inner container greatly restricts the heat dissipation area upward through the mouth of the inner container. Although the amount of overhang A is increased, the overhanging end of the inner container mouth is formed by the upper end of the second restriction part of the vacuum heat insulating material, and the heat is dissipated to the side of the heat outside the mouth. The blocking angle α from the horizontal line outside the mouth that double-blocks is lowered because the protruding amount B is larger than the protruding amount A, so that the blocking angle α exceeds approximately 45 °. The thermal radiation zone β between the axes can be narrowed to a range of 90 ° −α.

  Further objects and features of the present invention will become apparent from the following detailed description. Each feature of the present invention can be used alone or in combination in various combinations as much as possible.

  According to the electric hot water storage container of the present invention, air insulation in the gap between them is added to the double vacuum insulation by the inner container itself and the vacuum insulation material, and furthermore, by heat conduction from the inner container to the vacuum insulation material. The escape of heat to the inner container side is suppressed, and the heat retention is much higher than those described in Patent Documents 1 to 3, and the energy saving performance is excellent. Moreover, the temperature of the outer peripheral surface side of the vacuum heat insulating material becomes lower than that of the inner peripheral side, so that condensation can be prevented and the condensed water can be transferred down to damage the electrical component at the bottom of the body and prevent leakage. Further, the vacuum heat insulating material is prevented from coming into contact with the inner container in the assembling process, is hardly damaged, and is easy to assemble.

  The first restriction part of the mouth part of the inner container protrudes inward to restrict the radiation area of heat upward through the mouth part, and the second restriction part of the vacuum heat insulating material is above the mouth part of the inner container. Since the radiation area to the side of the heat that goes out of the mouth is limited by the heat shielding action extended to the side, the heat retaining property and energy saving performance are further enhanced.

  The heat insulation from the heat source is easily generated by the annular convex part that extends downward in the vacuum space while increasing the heating efficiency in the vacuum double container by hitting the heat source at the single bottom part in the inner container, and the vacuum heat insulating material Because the third restriction part of the heat source extends downward from the annular convex part to restrict the heat source and the heat radiation area from the annular convex part to the side, the heat retention and energy saving Is further increased.

  The amount of overhanging A of the first restricting portion at the mouth is made as large as possible, and the amount of overhanging B of the third restricting portion is larger than the amount of overhanging A. The heat blocking angle α from the inside of the inner container by the second restricting unit exceeds 45 °, so that the heat retaining property and the energy saving property are further improved.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to FIG. 1 to FIG. 6 to provide an understanding of the present invention.

  This embodiment is an example of a household electric pot, and a heat insulating container, specifically, a stainless steel vacuum double container is housed in an outer case as an inner container to constitute a container, and a lid It has a basic configuration that can be opened and closed by the body. However, the present invention is not limited to this, and the presence or absence of the heat insulating structure of the inner container itself can be freely selected. However, stainless steel has a low thermal conductivity among metals, and is effective in enhancing the heat retention of the inner container itself by making it a vacuum double container, and has sufficient bending rigidity and strength, and also has an anti-rust effect. Therefore, it is suitable for an electric hot water storage container for beverages.

  As described above and as shown in FIGS. 1 and 2, the electric pot of the present embodiment accommodates a vacuum double container as the inner container 3 in the outer case 2 to form the container 1. A lid 13 that opens and closes the opening 12 of the inner container 3 together with the mouth portion 3a of the inner container 3, a heater 11 as a heating source for heating the content liquid in the inner container 3, and a vacuum heat insulating material provided around the inner container 3 131, and a predetermined gap 201 is provided between the vacuum heat insulating material 131 and the inner container 3. Thus, air insulation in a predetermined gap 201 between the inner container 3 and the vacuum heat insulating material 131 is achieved by double vacuum heat insulation by the inner container 3 itself which is a vacuum double container and the vacuum heat insulating material 131 around the outer periphery thereof. In addition, the vacuum heat insulating material 131 receives heat conduction from the inner container 3 through the gap 201 and does not release heat to the side opposite to the inner container 3 while exhibiting remarkably high heat retention. Furthermore, heat retention is increased. In addition, the temperature difference between the inner peripheral surface of the vacuum heat insulating material 131 on the inner container 3 side and the outer peripheral surface of the inner container 3 side is reduced, and the problem of condensation on the outer peripheral surface of the vacuum heat insulating material 131 is avoided. can do. Moreover, it is easy to avoid that the vacuum heat insulating material 131 contacts the inner container 3 on assembly. As a result, air insulation in the gap 201 between the inner container 3 itself and the vacuum heat insulating material 131 is added to the double vacuum heat insulating material, and heat conduction from the inner container 3 to the vacuum heat insulating material 131 is also performed. The escape to the inner container 3 side is suppressed, and the heat retaining property is much higher than those described in Patent Documents 1 to 3, and the energy saving property is excellent. Moreover, the temperature of the outer peripheral surface side of the vacuum heat insulating material 131 is lower than that of the inner peripheral side, so that dew condensation occurs and the condensed water is transferred to prevent the risk of damaging the electrical components at the inner bottom of the vessel 1 or leakage. Further, the vacuum heat insulating material 131 is prevented from coming into contact with the inner container 3 in the assembling process, so that the vacuum heat insulating material 131 is hardly damaged and is easy to assemble.

  In particular, a positioning part 203 for forming a predetermined gap 201 between the vacuum heat insulating material 131 and the inner container 3 is provided in the non-metal part 202 of the container body 1. For that purpose, it is essential that the inner diameter of the vacuum heat insulating material 131 is larger than the outer diameter of the inner container 3, and the outer diameter of the positioning portion 203 is larger than the outer diameter of the inner container 3. It is easily realized without interfering with the engagement or engagement with 203 in the axial direction.

  As described above, the vacuum heat insulating material 131 provided around the outer periphery of the inner container 3 is in contact with the air insulation without heat conduction from the inner container 3 in the predetermined gap 201 formed between the inner container 3 and the vacuum heat insulating material 131. A heavy heat insulation structure is realized by securing a smaller predetermined gap 201 that is advantageous for air insulation by positioning that can suppress heat conduction from the inner container 3 by the positioning portion 203 formed by the non-metal portion 202 of the container body 1. Therefore, the heat insulation effect by the vacuum heat insulating material 131 around the inner container 3 can be enhanced. Moreover, since positioning is achieved by limited contact between the vacuum heat insulating material 131 and the inner container 3 without contact with the positioning portion 203, it is possible to easily position without damaging by assembling a cylindrically-preserved shape. Can hold. Therefore, in the present embodiment, the double heat insulation structure of the vacuum heat insulating material 131 and the air heat insulation by the gap 201 around the outer periphery of the inner container 3 is advantageous for air insulation by positioning that can suppress heat conduction from the inner container 3. A smaller predetermined gap 201 can be secured and realized, and further energy saving can be achieved by a heat insulating effect higher than that of the conventional case by the vacuum heat insulating material 131 around the inner container 3. In addition, since positioning can be easily performed without damaging by assembling a cylinder that has been previously held in a cylindrical shape, there is an advantage that it is easy to ensure safety even when the vacuum heat insulating material 131 is used. The heat insulating property can be further enhanced by the combined use of the vacuum heat insulating material 131 having a vacuum structure and the inner container 3 formed of a heat-insulating metal vacuum double container.

  Further, the positioning portion 203 positions the vacuum heat insulating material 131 in the radial direction by the synthetic resin shoulder member 6 which is a non-metal portion 202 that connects the outer case 2 and the inner container 3 of the container 1, and the shoulder member 6 and the bottom member 111 made of synthetic resin, which is a non-metallic part 202 of the outer case 2 of the container 1, the vacuum heat insulating material 131 is positioned in the vertical direction. As a result, the vacuum heat insulating material 131 retained in a cylindrical shape in the inverted state before assembling the bottom member 111 in the assembling process of the container body 1 is received with the fitting in the axial direction to the positioning portion 203 of the shoulder member 6. The positioning in the radial direction and the holding of the upper end side can be achieved easily and easily by being stopped, and the lower end side of the vacuum heat insulating material 131 is held between the shoulder member 6 and the vertical direction by assembling the bottom member 111 thereafter. Can be easily achieved without difficulty. In addition, by utilizing the vertical positioning of the vacuum heat insulating material 131, the gap 201 between the vacuum heat insulating material 131 and the inner container 3 can be closed up and down to further suppress air convection. Further, it is possible to prevent backlash and displacement of the vacuum heat insulating material 131.

  As a result, in this embodiment, the radial insulation and the vertical direction are also positioned to prevent backlash and displacement of the vacuum heat insulating material 131 so that the heat insulating property around the inner container 3 is impaired. In addition to preventing damage, the gap 201 between the vacuum heat insulating material 131 and the inner container 3 is closed up and down to suppress air convection and further improve heat retention and energy saving.

  In the present embodiment as described above, in the combination of the vacuum heat insulating material 131 and the stainless steel inner container 3, an energy saving effect of about 0.8 W / h is obtained from the experiment performed by the inventor. In the case of the electric pot in which the outer case 2 is combined with the inner container 3 made of stainless steel, it has a heat retaining performance that can secure a temperature of about 60 ° C. after 6 hours even after the liquid is boiled and the heating is stopped. However, the energy saving effect has been improved remarkably compared to about 0.5 W / h.

  In the present embodiment, as shown in FIGS. 4 and 5, the radial positioning portion 203 with respect to the vacuum heat insulating material 131 includes a shoulder member 6 that connects the outer case 2 and the inner container 3 of the container 1. It includes left and right rib-shaped portions as inner protrusions 205a of a handle bearing portion 205 that is provided at two locations on the diameter line of the outer peripheral wall 6a on the outer case 2 side to support the handle 204 so as to be raised and lowered. The handle bearing portion 205 can be commonly used for positioning the vacuum heat insulating material 131 in the radial direction. Also, as shown in FIGS. 3 and 5, it extends from the bottom of the inner container 3 into the container body 1, rises between the body parts of the inner container 3 and the outer case 2, and is fixed above the front part in the container body 1. It passes through the discharge port 25d facing downward from the body 1 through the water stop portion 134 in the abnormal posture, and is driven by a pump such as the electric pump 26 or the bellows pump 50 which is a manual pump, or the body 1 is tilted forward. Is provided with a discharge passage 25 that discharges the content liquid to the outside of the container body 1 according to the discharge operation of the container 1, and serves as a radial positioning portion 203 for the vacuum heat insulating material 131 to communicate the outer case 2 and the inner container 3 of the container body 1. An inner projecting portion 122a of a lid bearing portion 122 hinged by a hinge pin 120 so that the rear portion of the inner peripheral wall 6b of the outer case 2 side formed by the member 6 can be opened and closed, and the water stop portion 134 in the abnormal posture. Including the existing And an abnormality postural waterproof part 134 in the bearing portion 122 and the discharge passage 25 can be shared in the radial positioning of the vacuum heat insulating material 131.

  Here, the pair of handle bearing portions 205, 205, the lid bearing portion 122, and the abnormal water stop portion 134 are at positions orthogonal to each other as shown in FIG. This is sufficient for positioning, and the other radial positioning portions 203 can be omitted. As a result, as the positioning portion 203 is reduced in the circumferential direction, the axial fitting portion with the positioning portion 203 in which the cylindrical vacuum heat insulating material 131 is arranged in the circumferential direction is reduced, and the positioning work is facilitated accordingly. It becomes difficult to damage the vacuum heat insulating material 131.

  More specifically, the inner container 3 is made of metal having high bending rigidity and strength, and is also made of stainless steel, so that the wall thickness and the layer of the vacuum space 63 may be small and slim, and the inner container as described above. As described above, the vacuum heat insulating material 131 provided by setting a very small gap 201 between the outer casing 3 and the outer casing 2 reduces the minimum gap between the outer casing 2 and the above-described positioning. High heat retention and energy saving performance can be demonstrated. The heater 11 is applied to the single bottom 3c of the inner container 3 to increase the heating efficiency, and the connection structure with the inner container 3 is simplified by connecting the discharge path 25 to the single bottom 3c. The electric pump 26 is provided in the middle of the discharge passage 25 so that the content liquid can be discharged electrically. At the same time, the bellows pump 50 is provided on the lid body 13 so as to open and close the opening 12 of the container body 1 leading to the mouth 3 a of the inner container 3, and is added into the inner container 3 by the pressing operation by the pressing plate 61. The compressed air is blown in to pressurize the content liquid, and the liquid is pushed out through the discharge passage 25 and discharged to the outside.

  The rising portion 25a of the discharge path 25 is a transparent tube so that the liquid amount there can be seen through the liquid amount display window 62 shown in FIG. However, a flow rate sensor 125 comprising a vane 125a that is rotated by a discharge flow and a photocoupler 125b that detects the number of rotations of the vane 125a is provided above the rising portion 25a of the discharge path 25, and the discharge start, end, discharge flow rate, The discharge amount, remaining amount, etc. can be automatically detected.

  By the way, the heat retention characteristic in the thermostable heat retention state when the content liquid boiled in the electric pot having the inner container 3 is left without being heated by the heater 11 is almost inversely proportional to the size of the opening diameter of the mouth portion 3a. From the viewpoint of increasing the force, it is preferable to make the opening diameter of the mouth portion 3a as small as possible. But there are limitations. For example, considering the cleaning of the inner container 3 such as cleaning and wiping, the upper limit is about 80 mm for adult hands, especially fist, and it is easy to work at about 100 mm, about 120 mm. Beyond that, work becomes free. Further, by letting the portion of the lid 13 containing the bellows pump 50 as the entrance portion 13a enters the mouth portion 3a, the air in the inner container 3 is kept away from the outside of the mouth portion 3a as much as possible, and the heat escapes upward. And the lid 13 containing the bellows pump 50 can be prevented from projecting outward greatly. Further, the portion where the opening diameter of the mouth portion 3a is smaller than the body of the inner container 3 is formed by drawing, but the drawing operation becomes more difficult as the opening diameter of the mouth portion 3a is smaller.

  In addition, in order to apply fluorine coating or polishing treatment to the inner surface of the inner cylinder 4, it is necessary to insert a tool such as a gun or a nozzle, and it is also necessary to be able to move the tool freely in order for the treatment to be uniform. . Accordingly, the smaller the opening diameter D of the mouth portion 3a, the more difficult the processing becomes, and there is a problem that even if it can be processed, it takes time or cannot be processed uniformly. Further, in the step of blasting the inner surface before fluorine coating to increase the adhesion of the fluorine coating layer, the blast material sprayed into the inner cylinder 4 is difficult to return to the outside of the inner cylinder 4 and the workability is deteriorated. For example, when the opening diameter of the mouth portion 3a is less than 100 mm, a gun for spraying the coating material does not enter the inner cylinder 4, and fluorine coating becomes impossible.

  Conventionally, from these circumstances, a comprehensive judgment is made on the relationship between the heat retention characteristics and various good and bad characteristics, and the careability, miniaturization, drawing workability and cost, and the processing and processing of the inner surface of the inner cylinder 4 are performed. It is preferable to set the lower limit of the opening diameter to 120 mm, which is a satisfactory limit of ease, and the inner cylinder 4 is realized as a throttle shape that rises at the problematic large angle described above.

  In contrast, in the present embodiment, as shown in FIG. 3, the opening formed by the resin shoulder member 6 of the body 1 with the opening 3 a of the inner container 3 having an opening diameter smaller than the inner diameter of the body 3 b. 12 and is opened and closed by the lid body 13 provided in the opening 12 of the vessel 1, the inner container 3 has a vacuum space 63 extending substantially from the upper end of the body 3 b to the inside of the body 3 b. It is assumed that a shoulder 3d is formed laterally and bent to form a mouth 3a smaller than the inner diameter of the body 3b. Thus, to adopt the metal inner container 3 that exhibits high heat retention power while having a small wall thickness and a small layer of the vacuum space 63 by being made of metal having high bending rigidity and strength, The shoulder 3d is bent substantially horizontally from the upper end of the body 3b of the inner container 3 to the inside of the body 3b, and a mouth 3a smaller than the inner diameter of the body 3b is formed. Even if the degree of squeezing is about the same as that of the conventional one, or it has a larger heat retention, it has a squeezed shape that rises at a large angle from the inner cylinder body to the mouth and narrows the upper volume of the inner container 3 like the conventional one. Compared to the conventional one, the height H from the full water level 101 to the mouth portion 3a is made smaller than the conventional one because the upper volume of the inner container 3 is not reduced. Large space between body 13 And it is possible to prevent the natural discharge.

  The shoulder 3d of the inner container 3 forms a stepped portion 4b2 that is recessed inward at the boundary between the inner cylinder body 4a and the inner cylinder shoulder 4b3. As a result, when a pressing force is applied to the mouth 3a of the inner container 3, the stress is easily concentrated on the base of the shoulder 3d extending substantially laterally from the upper end of the trunk 3b to the mouth 3a. The bending rigidity of the base portion of the shoulder portion 3d can be increased by the step portion 4b2 recessed inwardly at the boundary portion with the shoulder portion 4b3, so that the shoulder portion 3d can be prevented from being deformed with its base portion as a base point. Can do.

  The shoulder 3d of the inner container 3 includes an inner cylinder shoulder 4b having the inner cylinder shoulder 4b3 and the step 4b2 joined to the inner cylinder 4a, and an outer cylinder shoulder 5c joined to the outer cylinder 5b. And are joined to each other by forming the mouth portion 3a. Thus, the shoulder 3d of the inner container 3 is easily formed into a hollow container shoulder member 3d1 by joining two members independent of the body 3b, and these two members are formed on the inner cylinder body 4a and the outer cylinder body 5b. By joining, the shoulder portion 3d that extends the vacuum space 63 substantially horizontally inward from the upper end of the body portion 3b can be easily formed without drawing between the body portion 3b.

  Further, the upward inner peripheral wall 4b1 formed on the inner cylinder shoulder member 4b is fitted and joined to the outer surface of the downward inner peripheral wall 5c1 formed on the outer cylinder shoulder member 5c to form the mouth portion 3a. As a result, the joint between the upward inner peripheral wall 4b1 of the inner cylinder shoulder member 4b and the downward inner peripheral wall 5c1 of the outer cylinder shoulder member 5c is aligned, and is superposed for easy position adjustment. There is an advantage that the joining step portion 3a2 by the overlapping can be faced downward and is not visually recognized from the outside through the mouth portion 3a, and the joining step portion 3a2 is inside the portion closed by the lid body 13 of the mouth portion 3a and the lid body. It is possible to avoid the formation of a gap in the seal with 13.

  Further, as shown in FIG. 1, the inner container 3 has a wraparound portion 63 a that extends from the body portion 3 b of the vacuum space 63 to the outer periphery of the single bottom portion 3 c, and a single bottom portion 3 c to which the heater 11 is applied. It has become. The single bottom portion 3c is a downward concave portion 3e that is recessed upward, and the position of the heater 11 projects toward the content liquid side by the depth of the concave portion 3e, and the contact area with the content liquid in the installation area of the heater 11 Increases the heating efficiency. An upward concave portion 84 is formed in an annular shape between the protruding portion into the inner cylinder 4 by the concave portion 3 e and the wraparound portion 63 a, and the content liquid discharged through the discharge path 25 is somewhat left in the concave portion 84. As shown, the inflow end 25e of the discharge passage 25 is opened at an appropriate height above the single bottom portion 3c. As a result, the content liquid remains without being discharged as much as the inflow end 25e protrudes into the inner cylinder 4, thereby preventing emptying.

  As shown in FIG. 1, a metal heat shield 87 is provided on the back of the heater 11 applied to the single bottom 3 c, and is welded to the lower surface of the annular bottom 5 e of the outer cylinder 5 of the inner container 3. The mounting bracket 88 is screwed with a screw 89, a metal backup plate 92 and a spring member (not shown) are sandwiched between the heat shield plate 87 and the heater 11, and the heater 11 is pressed against the single bottom portion 3c by the spring member. It is in close contact.

  The outer case 2 has an assembly structure in which a metal body 112 is sandwiched between a resin bottom member 111 and the shoulder member 6, and an opening 12 as shown in FIG. 3 of the container 1 formed by the shoulder member 6. An attachment structure in which the inner container 3 is attached to the flange 113 provided in the lower part of the inner periphery with screws 115 from above via an attachment fitting 114 welded to the shoulder portion 3d, and the bottom and bottom members 111 of the inner container 3 The outer case 2 is integrated and separable with a connecting structure that is connected by sharing the mounting bracket 88 and the screw 89 that are welded to each other.

  In the illustrated example, as shown in FIGS. 3 and 4, the container mouth is further provided by a cover ring 118 that is applied from above the mounting structure portion to the upper portion of the flange 113 of the opening 12 of the shoulder member 6 and engaged with the hook 118 a. It covers the top half of the outer surface of 3a1. The cover ring 118 is attached to the outer peripheral portion with a seal member 119 to seal between the inner periphery of the opening 12 of the shoulder member 6, and is continuous with the inclined stepped portion 12 a formed in the middle of the inner periphery of the opening 12 toward the inside. The content liquid or the like that falls into or flows into the opening 12 flows from the inclined step portion 12a of the opening 12 of the shoulder member 6 onto the cover ring 118, and flows into the container mouth. It falls on the inner peripheral half of 3a1 so that it can be guided into the inner container 3.

  As shown in FIG. 1, an opening 122 a 1 for receiving and bearing a hinge pin 120 provided on the lid 13 so that it can be attached and detached is attached to the lid bearing 122 at the rear of the shoulder member 6, and the opening 122 a 1 is biased by a spring 123. When the stopper 124 is opened, the hinge pin 120 can be taken in and out of the lid bearing portion 122 with the lid 13 in a state where the lid 13 is half-opened. The lid 13 has an entry portion 13a into the mouth portion 3a of the inner container 3 as described above and shown in FIGS. 1 and 2, and the mouth portion 3a is an entry portion when the lid body 13 is opened and closed. 13a is located closest to the envelope drawn. In this way, by entering a part of the lid 13 as the entry portion 13a and entering the mouth portion 3a of the inner container 3, the heat retaining force is enhanced while preventing heat from escaping from the mouth portion 3a. Further, by accommodating the steam passage 225 provided in the lid 13 and the bellows pump 50 which is a manual pump, the large capacity necessary for the lid 13 can be sufficiently secured, and the bulge to the outside of the container body 1 can be suppressed. In addition, the opening 3a of the inner container 3 having a reduced opening diameter as described above is in the immediate vicinity of the envelope drawn by the outline of the entry portion 13a when the lid 13 is opened and closed, so that the opening and closing of the lid 13 is not obstructed. The opening diameter can be reduced to the full limit, making it more difficult for heat to escape.

  Further, a sealing member 127 sandwiched between the lid body 13 and a metal inner lid 126 applied to the entry portion 13a is provided around the base portion of the entry portion 13a of the lid body 13, and the mouth portion 3a The mouth 3a is closed by pressing against the inner half of the top surface or the inner half of the top and the inner corner of the mouth 3a. As a result, the air located in the safe space for preventing the liquid content from closing the inner opening 225a of the steam passage 225 between the full water level 101 and the entry portion 13a spreads to the outside more than the mouth portion 3a, so that heat easily escapes. Since it is prevented from becoming, heat retention improves.

  In addition, if at least one of manual pumps such as the electric pump 26 and the bellows pump 50 is provided, the liquid contents can be discharged and used while the electric hot water storage container is fixed, and the size of the pump increases recently, making it difficult to lift. It is suitable for the large type. In particular, when a manual pump is provided, the content liquid can be discharged without being energized during use in a thermos warming state where the heater 11 is not heated, which is suitable for use in places where there is no energy saving or power supply.

  The lid body 13 is formed with a steam passage 225 for allowing the steam from the inner container 3 to escape to the outside, and an inner opening 225a at a position facing the inner container 3 of the lid body 13 and an outer opening formed on the outer surface exposed to the outside. It is formed so as to communicate with 225b. In the middle of the steam passage 225, when the container body 1 rolls over and the liquid content enters, a safety path 225c is provided that temporarily accumulates or bypasses the liquid and delays reaching the outer opening 225b. As a result, it is possible to take measures such as raising the container 1 before the container 1 rolls over and the content liquid flows out through the vapor passage 225. In addition, the steam passage 225 is provided with an appropriate water stop valve 225d at the time of falling so as to enter the steam passage 225 when the container 1 rolls over, or to act on its own weight so as to prevent the entered content liquid from proceeding further. Is provided. In the illustrated embodiment, it is provided at a location just inside the inner opening 225a.

  A lock member 21 is provided at the front portion of the lid body 13 so as to engage with the locking portion 19 on the shoulder member 6 side in the closed position to lock the lid body 13 in the closed position. When the lid body 13 is closed The spring 22 is always urged to the locked position so as to automatically engage with the locking portion 19. Correspondingly, the lid 13 is provided with a lock release member 23 for releasing the lock by operating the lock member 21 backward. As shown in FIG. 1, the unlocking member 23 is of a lever type pivotally supported on the lid body 13 by a shaft 24, and the front end 23a is pushed down with a thumb or the like to rotate counterclockwise, thereby releasing the locking member 21. The lock 13 is released against the spring 22 to release the lock, and then the lifted lid 13 can be lifted and opened by pulling up the rear end 23b raised by the unlock operation with another finger.

  Although not shown in the drawings, the electric pump 26 is provided between the space between the bottom of the outer case 2 and the bottom of the inner container 3 or between the body 112 of the outer case 2 and the body 3b of the inner container 3. A temperature sensor 9 is applied to the center of the single bottom portion 3c of the inner container 3 from below to detect the temperature of the content liquid, Temperature information when the content liquid is heated and controlled in the heat retention mode is obtained.

  An operation panel 32 is provided on the upper surface of the protruding portion 31 protruding in the shape of a bowl at the front portion of the shoulder member 6 of the body 1, and an operation portion for mode setting, a display corresponding to the operation, or a display indicating the operation state To do. Below the operation panel 32, that is, inside, an operation board 33 is provided for performing transmission and reception of signals corresponding to the operation and display, and in cooperation with the operation panel 32, external operation and display to the outside can be performed. Like that. The upper portion of the discharge path 25 is a portion between the protruding portion 31 of the container body 1 and the pipe cover portion 2d on the outer case 2 side to form an inverted U-shaped unit 25c. A water stop valve 134 a for falling and a water stop valve 134 b for forward tilt and a discharge port 25 d of the discharge path 25 are provided. The discharge port 25d is opened downward through the pipe cover portion 2d.

  The rotary seat ring 37 is fitted in the downward recess 111a of the bottom member 111 of the outer case 2 so that it can rotate from below, and when the container 1 is placed on the table surface or the like, It is designed to change direction by lightly rotating above.

  In the container 1 having such a specific structure, in particular, as the positioning member 203 formed on the shoulder member 6 which is the non-metal portion 202 that positions the upper end portion of the vacuum heat insulating material 131 in the radial direction, the shoulder member 6 is connected from the axial direction to the outer peripheral surface that expands toward the upper portion of the inner peripheral wall 6b on the inner container 3 side that connects the opening 3a of the inner container 3 to the opening 12 of the inner container 3, and fits without gaps at the top. The inner circumference of the resin frame material 207 is attached by bonding, welding or the like to the upper end portion of the vacuum heat insulating material 131. And the outer periphery of the inner peripheral wall 6b of the shoulder member 6, and the upper end portion of the vacuum heat insulating material 131 is placed at the above-mentioned fitting position by a plurality of radial ribs 6c formed downward between the inner and outer peripheral walls 6a, 6b of the shoulder member 6. Over and under for catching and fitting with inclined surface It is prevented from. Further, in this position, the handle bearing portions 205 and 205 with respect to the upper end portion of the vacuum heat insulating material 131 and the radial positioning at the outer diameter by the water stop portion 134 and the lid bearing portion 122 in the abnormal posture are performed. ing. This positioning is also performed between the outer periphery of the frame member 207 attached to the upper end of the vacuum heat insulating material 131. Therefore, even if the vacuum heat insulating material 131 is formed of a flexible material, the radial positioning can be firmly performed through the frame material 207, so that the positional accuracy by positioning is remarkably high, and the vacuum heat insulating material 131 and the inner container 3 The gap 201 is a minute gap suitable for suppressing air convection, and the gap is displaced due to vibrations caused by external forces during assembly and use, and the gap is offset or otherwise touched or caught. Can be avoided. Moreover, the radial positioning with respect to the vacuum heat insulating material 131 is effective as one of the inner peripheral side and the outer peripheral side.

  Further, the lower end portion of the vacuum heat insulating material 131 is formed by a bowl-shaped step portion 111b formed by an upper surface of a portion of the bottom member 111 where the concave portion 111a is formed and a convex wall 111c integrally formed on the inner peripheral side thereof. It is elastically received by an elastic ring 208 made of an annular foamed urethane rubber or the like held on the elastic ring 208 so that it can be elastically positioned with respect to the rib 6c of the shoulder member 6 in the vertical direction. As a result, the positioning in the vertical direction is not so easy that the vacuum heat insulating material 131 is not rattled or displaced, and the positioning is excessive and the vacuum heat insulating material 131 is distorted. It is possible to reliably prevent contact and damage. In particular, if the elastic ring 208 has an independent foam structure, the heat insulating properties combined with the vacuum heat insulating material 131 can be exhibited, which leads to an improvement in energy saving. The elastic ring 208 is also supported by radial ribs 111d following the saddle-shaped stepped portion 111b of the bottom member 111 for further stabilization. Moreover, the bottom member 111 engages radial ribs 111e rising from the saddle step 111b with the inner periphery of the lower end portion of the vacuum heat insulating material 131 to position the vacuum heat insulating material 131 in the radial direction. However, instead of this, a part of the rib 111d is raised and engaged with the outer periphery of the vacuum heat insulating material 131 so that the lower end portion of the vacuum heat insulating material 131 can be positioned in the radial direction from the outer diameter side.

  However, the positioning in the radial direction at the lower end portion of the vacuum heat insulating material 131 can also be omitted. As a result, the vacuum heat insulating material 131 is placed in a posture in which the body 1 before the bottom member 111 is mounted is inverted. Is inserted into the positioning portion 203 on the shoulder member 6 side, and the bottom end of the vacuum heat insulating material 131 is fitted by the elastic ring 208 without fitting in the radial direction when the bottom member 111 is mounted. All that is required is to hold it down, and the assembly is simplified. For this purpose, it is preferable to fit the vacuum heat insulating material 131 so that the axis of the vacuum heat insulating material 131 does not swing by positioning in the radial direction with respect to the upper end portion of the vacuum heat insulating material 131 on the shoulder member 6 side. It is preferable that the fitting margin dimension in the axial direction between the positioning member 203 on the shoulder member 6 side is increased to some extent, and the fitting width is stable in the circumferential direction.

  In addition, when the elastic ring 208 is a foamed urethane resin, particularly a foamed resin having an independent foam structure, it is possible to contribute to the improvement of heat retention and energy saving performance by exhibiting high heat insulation properties together with the vacuum heat insulating material 131.

  Here, the vacuum heat insulating material 131 is already known, and various types of vacuum heat insulating structures developed later can be adopted. However, as shown in FIG. 3, in the inner container 3 which is a vacuum double container, its body portion 3b. In contrast to the first restricting portion E that restricts the radiation area from the inside of the inner container 3 to the upper side through the mouth portion 3a by projecting the mouth portion 3a narrowed to be smaller than the inner diameter, the vacuum heat insulating material A second restricting portion F that restricts a radiation area around the side of the heat outside the mouth portion 3a of the inner container 3 is formed by extending upwardly of 131 so that the mouth portion 3a of the inner container 3 is higher. . As a result, heat in the inner container 3 is dissipated upward in a range in which the first restricting portion E provided in the mouth 3a of the inner container 3 projects inward from the inner diameter of the body 3b of the inner container 3. It is cut off by the heavy structure, and the radiation area of the heat upward from the inner container 3 through the mouth part 3a can be restricted, and the second restriction part F of the vacuum heat insulating material 131 is more than the mouth part of the inner container. In the range extending upward, the heat that has flowed out of the mouth portion 3a of the inner container 3 is blocked by the vacuum insulation structure so that the heat outside the mouth portion 3a of the inner container 3 is dissipated. The lateral radiation area can be limited. As a result, the first restriction part E of the mouth part 3a of the inner container 3 restricts the radiation area of heat upward through the mouth part 3a by the heat shielding action projecting inward, and the second restriction part of the vacuum heat insulating material 131 Since F limits the radiation area to the side of the heat which went out of the mouth part 3a by the heat-shielding action extended upward from the mouth part 3a of the inner container 3, the heat retaining property and the energy saving performance are further enhanced.

  Furthermore, the amount B of the second heat insulating material 131 projecting upward from the inner container 3 that is the vacuum double container of the second restricting portion F is larger than the amount A projecting inward of the first restricting portion E of the inner container 3. It is set. Thus, the amount A of the inner container 3 overhanging the first restriction portion E at the mouth portion 3a is larger through the mouth portion 3a of the inner container 3 as the difference between the inner diameter D of the body portion 3b of the inner container 3 is larger. However, the protruding end of the first limiting portion E, which is the protruding portion to the inside of the mouth portion 3a of the inner container 3, is increased by the amount by which the protruding amount A is increased. The cut-off angle α from the horizontal line outside the mouth portion 3a that double-blocks the heat diffusion to the side outside the mouth portion 3a, which is formed at the upper end of the second shut-off portion F of the vacuum heat insulating material 131, is low. This is because the relationship of A <B where the overhang amount B is larger than the overhang amount A is such that the cut-off angle α exceeds approximately 45 ° and the heat radiation region β between the axis of the inner container 3 and Can be narrowed to a range of 90 ° -α. In addition, the heat radiation area β is narrowed, and the convergence point of the inner container 3 with respect to the axis rises to near the full water level 101, which makes it difficult to dissipate heat. Here, the height of the convergence point on the axis depends on the diameter of the mouth portion 3a of the inner container 3, and the convergence point moves upward as the diameter decreases.

  Further, as shown in FIG. 6, the inner container 3 that is a vacuum double container has an annular projection 5 e that extends the vacuum space 63 downward from the heater 11 as a heating source that hits the single bottom part 3 c. 5 and a third restricting portion G that restricts the heat radiating area from the heater 11 to the side by extending downward to make the vacuum heat insulating material 131 lower than the annular protrusion 5e. Thereby, the inner container 3 is in contact with the single bottom portion 3c so as to prevent the vacuum double structure from interfering with the heating of the liquid contents, thereby reducing the heating efficiency. The third restricting portion G of the vacuum heat insulating material 131 is lower than the annular convex portion 5e while facilitating the heat from the heater 11 to the inside of the annular convex portion 5e by the annular convex portion 5e extending the space 63 downward. In the range extending in the direction of heat, the heat dissipation from the inside of the heater 11 and the annular protrusion 5e to the side is blocked by the vacuum heat insulating structure, and the heat inside the heater 11 and the annular protrusion 5e The radiation range of heat from the area to the side can be limited.

  As a result, in the inner container 3, the heater 11 is applied to the single bottom portion 3 c to increase the heating efficiency in the inner container 3 without obstructing the vacuum space 63, and the heater is provided by the annular protrusion e extending the vacuum space 63 downward. Heat from 11 is easily spread, and the third restricting portion G of the vacuum heat insulating material 131 extends downward from the annular projecting portion 5e, so that the heat from the heater 11 and the annular projecting portion 5e is lateral to the side. Since the radiation area of heat to the surroundings is limited, heat retention and energy saving are further enhanced.

  From the above, the relationship between the height H1 of the inner container 3 and the height H2 of the vacuum heat insulating material 131 shown in FIG. 2 is H1 <H2. Here, since the elastic ring 208 is a foamed resin, in particular, an independent foamed resin, it can exhibit heat insulation characteristics comparable to the vacuum heat insulating material 131, and is included in the downward extension amount G shown in FIG. You can also

  If the downward extension amount of the vacuum heat insulating material 131 with respect to the annular convex portion 5e is C as shown in FIG. 6, the heat escape is larger in the upper part than in the lower part of the inner container 3, and therefore B> C In the same height limit of the container body 1, the heat radiation restriction to the side around the upper part of the inner container 3 can be made larger, which is advantageous for heat retention and energy saving. The thickness of the container body 1 in the opening 12 of the container body 1 can be used without loss of height space, and the height of the container body 1 is not particularly increased. As a result, in the above embodiment, the relationship of A <B> C is established. However, for further downsizing of the container body 1 and a difference in the thickness of the lid body 13, the relationship of A> B> C can be established.

  Further, for slimming the container 1, the inner container 3 is made of metal, has high deformation strength, and the vacuum space 63 is set to be extremely narrow, and there is no problem, and a gap 201 between the inner container 3 and the vacuum heat insulating material 131 is present. The distance L1 between the vacuum heat insulating material 131 and the outer case 2 is also air insulation, while the distance L1 between the vacuum heat insulating material 131 and the outer case 2 can also be reduced. Since sufficient heat insulation can be secured by the vessel 3, the gap 201 and the vacuum heat insulating material 131, the body of the vacuum heat insulating material 131 and the body of the outer case 2 are in contact with each other for the purpose of handling the body 1, and heat conduction. It is preferable to satisfy the relationship of L2> L1 in order to prevent the heat radiation to the outside due to the above, or the vacuum heat insulating material 131 from being damaged by an external force and losing the vacuum heat insulation.

  INDUSTRIAL APPLICABILITY The present invention can be put to practical use in household electric pots and contribute to further improvement of heat retention and energy saving.

It is sectional drawing which shows the electric pot as one example of the electric hot water storage container which concerns on this invention. It is the front view which looked at the half part of the electric pot of FIG. It is sectional drawing of the upper part of the electric pot of FIG. It is a partial cross section figure of the upper part of the electric pot of FIG. It is the bottom view seen across the trunk | drum of the electric pot of FIG. It is a partial cross section figure of the bottom part of the electric pot of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 2 Outer case 3 Inner container 3a Mouth part 3b Body part 4 Inner cylinder 5 Outer cylinder 11 Heater 12 Opening 13 Cover body 63 Vacuum space 120 Hinge pin 131 Vacuum heat insulating material 201 Gap E 1st restriction part F 2nd restriction part G Third restriction part

Claims (4)

The outer case accommodates a vacuum double container as an inner container to form a container, a lid that opens and closes the opening of the container together with the mouth of the inner container, a heating source that heats the content liquid in the inner container, An electric hot water storage container, comprising: a vacuum heat insulating material provided around the outer periphery of the inner container, wherein a predetermined gap is provided between the vacuum heat insulating material and the inner container. In addition to the first restricting part that restricts the radiation area from the inside of the inner container to the upper side of the heat by projecting to the inner diameter side of the mouth part narrowed smaller than the inner diameter of the inner part of the inner container which is a vacuum double container The second restriction part for restricting the radiation area around the side of the heat outside the mouth part of the inner container by extending the vacuum heat insulating material higher than the mouth part of the inner container is provided. The electric hot water storage container described. The inner container, which is a vacuum double container, has an annular convex part that extends the vacuum space downward than the heating source that hits the single bottom part, and lowers the vacuum heat insulating material below this annular convex part. The electric hot water storage container according to any one of claims 1 and 2, further comprising a third restriction portion for restricting a heat radiation area from the heating source to the side by extension. The amount B of upward protrusion with respect to the inner container, which is a vacuum double container, of the second restriction portion of the vacuum heat insulating material is set to be larger than the amount A of protrusion of the inner container to the inside of the first restriction portion. The electric hot water storage container according to any one of the above.

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