JP2008005982A - Lid structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make desired heat insulating performance to be exhibited in spite of a simple structure. <P>SOLUTION: The lid structure includes a lid body 5 which is formed with a steam passage, a lid cover 6 covering the upward opening of the lid body 5, and a heat insulating member 7 arranged in an internal space formed of the lid body 5 and the lid cover 6. The heat insulating member 7 is composed of a first heat insulating material 14 arranged in the lid body 5, a second heat insulating material 15 arranged in the lid cover 6, and a vacuum heat insulating material 16 arranged between both the heat insulating materials. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lid structure that can improve the heat insulation performance of a lid used for an electric water heater or the like.

  Conventionally, a lid used for an electric water heater or the like employs the following heat insulating structure. In other words, the decorative frame constituting the lid body is configured to be heat-insulated under reduced pressure, or a vacuum heat insulating material is provided on the decorative frame, so that the heat insulating performance at the lid body portion can be improved and the power consumption during heat insulation can be reduced. (For example, refer to Patent Document 1).

JP 2002-34793 A

  However, in the conventional lid structure, the heat insulating material made of urethane foam and the reduced pressure heat insulating structure portion of the decorative frame or the vacuum heat insulating material are provided separately and independently. For this reason, an occupation space becomes large and brings about the enlargement of a cover body structure. Moreover, the heat insulation performance of the whole cover body is only the sum total of the heat insulation performance obtained in each part.

  Therefore, an object of the present invention is to provide a lid structure capable of obtaining a desired heat insulation performance in spite of a simple configuration.

  The present invention provides, as means for solving the above-mentioned problems, a lid structure that opens and closes an upper opening of a container body and has a heat insulating structure, a lid body in which a steam passage is formed, and an upper side of the lid body. A lid cover that covers the opening; and a heat insulating member that is disposed in an internal space formed by the lid main body and the lid cover, wherein the heat insulating member is a first heat insulating material that is disposed in the lid main body, and It is comprised from the 2nd heat insulating material arrange | positioned at a lid cover, and the vacuum heat insulating material arrange | positioned between the said both heat insulating materials.

  With this configuration, the three heat insulating materials can be provided in one place, so that the desired heat insulating performance can be exhibited while suppressing the occupied space.

  It is preferable to form protrusions for making point or line contact with each other on at least one of the heat insulating materials or the vacuum heat insulating materials.

  With this configuration, it is possible to form a gap between the respective heat insulating materials, and an air layer constituted by the gap can be used as a heat insulating layer, so that the heat insulating performance can be further improved.

  It is preferable that the vacuum heat insulating material is disposed in a space formed by the concave portion by forming a concave portion in at least one of the heat insulating materials and overlapping the two heat insulating materials.

  This configuration not only enables positioning of the vacuum heat insulating material, but also ensures a sandwich structure with both heat insulating materials, so the vacuum heat insulating material can be surely made in various shapes such as flat and curved shapes. It can hold | maintain and it becomes possible to exhibit desired heat insulation performance.

  The vacuum heat insulating material accommodates a flat core material in a sheet-like bag body, evacuates the inside, seals the opening, and removes the peripheral portion of the bag body protruding from the core material to one side of the core material. It is preferable that it bend | folded inside and arrange | positions so that the bending side may be located in the said 2nd heat insulating material side.

  With this configuration, the seal portion is not located on the side that is easily affected by heat, and durability can be improved.

  According to the present invention, since the vacuum heat insulating material is sandwiched between the first heat insulating material and the second heat insulating material, three heat insulating materials can be provided in one place, and an occupied space can be provided. It becomes possible to exhibit desired heat insulation performance while suppressing.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 and 2 show an electric water heater according to this embodiment. This electric water heater is generally provided with an inner container 2 inside an exterior body 1, a shoulder member 3 is attached to the upper opening of the exterior body 1, and a lid body 4 is rotatably provided on the shoulder member 3. The upper opening of the inner container 2 can be opened and closed. In the following description, only the structure of the lid 4 that is a characteristic part of the present invention will be referred to, and descriptions of other configurations will be simplified or omitted.

  As shown in FIGS. 3 and 4, the lid body 4 is generally composed of a lid body 5, a lid cover 6, and a heat insulating member 7 disposed in an internal space formed by these.

  As shown in FIG. 8, the lid body 5 is formed by molding a synthetic resin material, and has a first recess 8 in which a first heat insulating material 14 described later is disposed. Ribs 8a are formed in a lattice pattern on the bottom surface of the first concave portion 8, thereby reinforcing and reducing the weight. A hinge portion 5a is formed on the rear side of the lid main body 5 (the shaft serving as the center of rotation is omitted in the drawing), and on the front side thereof, a steam passage is formed and liquid leakage at the time of falling is prevented. A liquid leakage prevention portion 5b is formed.

  A cylindrical portion 9 protrudes downward on the outer peripheral portion of the lower surface of the lid body 5, and boss portions 5 c are formed at three positions on the inner side at equal positions in the circumferential direction. An escape recess 10 is formed inside the boss 5c. A protrusion 10 a is formed at the center of the relief recess 10.

  The lower plate 11 shown in FIG. 9 is fixed to the boss portion 5c with screws. The outer peripheral portion of the lower plate 11 contacts the tip of the cylindrical portion 9. The lower plate 11 is obtained by pressing a circular plate made of metal such as stainless steel. A conical recess 11 a that protrudes upward is formed at the center of the lower plate 11. A packing 11b such as rubber is attached to the outer peripheral portion of the lower plate 11. A plurality of through holes 11c are formed in the center of the recess 11a. The concave portion 11a is located in the escape concave portion 10, and in this state, the projection 10a abuts to form an extra space on the outer peripheral side. A sufficient space is also formed in the recess 11a itself. Therefore, even if the liquid contained in the inner container 2 is boiled in a full state, it does not flow out to the outside due to the presence of the recess 11a and the excess space around it.

  Note that through holes 5d are formed on both sides of the front side of the lid body 5, and screws are screwed into the bosses 12a of the lid cover 6 through the through holes 5d, whereby the lid body 5 and the lid cover 5 are fitted. 6 can be integrated.

  As shown in FIG. 5, the cover cover 6 is formed by molding a synthetic resin material in the same manner as the cover body 5, and has a second recess 12 in which a second heat insulating material 15 to be described later can be disposed. . Further, the lid cover 6 is provided with a lock mechanism for maintaining a locked state when the lid body 4 is closed. The lock mechanism has a known configuration in which the lock state is released by lifting and turning the knob 13 and the lid 4 can be turned and opened. In addition, screw bosses 12a are provided on both sides of the lock mechanism, and steam holes 12b are formed on the rear side. A hinge cover portion 12c that covers the hinge portion is provided on the further rear side of the steam hole 12b.

  The heat insulating member 7 includes a first heat insulating material 14 disposed on the lid main body 5, a second heat insulating material 15 disposed on the lid cover 6, and a vacuum heat insulating material 16 disposed between the two heat insulating materials.

  As shown in FIG. 7, the first heat insulating material 14 is molded according to the shape of the first recess 8 so that expanded polypropylene (PP) can be disposed in the lid body 5. That is, the lower surface of the first heat insulating material 14 is formed with a groove 14a in which a central portion is recessed in accordance with the shape in the first recess 8 of the lid body 5 and a rib 8a formed on the bottom surface of the lid body 5 is located. Yes. In addition, a cutout portion 14b for avoiding the lock mechanism is formed in the upper front portion of the first heat insulating material 14, and a liquid leakage preventing portion is located in the rear portion of the upper surface to communicate with the steam hole 12b. 14c is formed.

  Similar to the first heat insulating material 14, the second heat insulating material 15 is formed by molding foamed polypropylene, and has a shape that can be disposed in the second recess 12 of the lid cover 6 as shown in FIG. The lid cover 6 has a three-dimensional shape with a curved surface, and the second heat insulating material 15 has a shape with a curved surface corresponding to the three-dimensional shape. Similarly to the first heat insulating material 14, the second heat insulating material 15 is formed with a notch 15a on the front side and a communication portion 15b on the rear side. In addition, on the lower surface of the second heat insulating material 15, projections 15 c having a rectangular shape in plan view are formed at a plurality of locations. These protrusions 15 c come into contact with the first heat insulating material 14 and the vacuum heat insulating material 16 disposed on the upper surface thereof, and form a gap between the heat insulating materials 14 and 16.

  The vacuum heat insulating material 16 contains a core material in a sheet-like bag body, vacuums the inside, and seals the opening edge. As the core material, inorganic powders such as silica and pearlite, inorganic fibers such as glass wool, and foam materials such as urethane foam and polypropylene foam can be used. The bag can be made of nylon, a resin film such as PET (Polyethylene Terephthalate), or a metal stay such as an aluminum foil. The vacuum heat insulating material 16 is used by bending the seal portion protruding from the core material inward. The bent seal portion is positioned above when the vacuum heat insulating material 16 is disposed on the upper surface of the first heat insulating material 14. Thereby, the thermal influence which a seal part receives can be suppressed. As a result, the sealing performance of the sealing portion is not easily lost, and the life can be extended. Further, since the bent seal portion can be pressed by the second heat insulating material 15, it is not necessary to fix it with a tape or the like in advance.

  In the above-described embodiment, the vacuum heat insulating material 16 is sandwiched between the first heat insulating material 14 and the second heat insulating material 15 and is partially brought into surface contact by the protrusion formed on the second heat insulating material 15. It is also possible to make a point contact with a semispherical projection or a contact with the entire surface. The protrusions can be formed not only on the first heat insulating material 14 but also on the second heat insulating material 15 or the vacuum heat insulating material 16. Furthermore, not only a protrusion but it can also comprise so that a line contact may be carried out by a protrusion. And what is necessary is just to make a protrusion or a protrusion form in any one or both of the said heat insulating materials, and to contact | abut with the remaining other. Thereby, a clearance gap (air layer) can be formed between both heat insulating materials, and it becomes possible to improve heat insulation performance further. Moreover, the vacuum heat insulating material 16 can be supported on the same plane regardless of the curved surface shape of the lid cover 6 and the second heat insulating material 15 by forming the protrusions and the protrusions. Therefore, it is not necessary to bend the vacuum heat insulating material 16 and the first heat insulating material 14 as in the prior art, and it can be formed into a flat shape that can be easily processed.

  Moreover, a recessed part may be formed in either one or both of the 1st heat insulating material 14 or the 2nd heat insulating material 15, and you may make it arrange | position the vacuum heat insulating material 16 in this recessed part. According to this, not only can the vacuum heat insulating material 16 be positioned, but the vacuum heat insulating material 16 can be surely formed into a sandwich structure by the both heat insulating materials 14 and 15. For this reason, the vacuum heat insulating material 16 can be reliably held in various shapes such as a flat shape and a curved shape.

  The lid 4 having the above-described configuration is rotatably supported by the hinge receiving portion 17 of the shoulder member 3. And this rotation center is located in the substantially same horizontal surface as the collar part 2a of the inner container 2. FIG. Accordingly, the lid 4 has a large thickness in order to incorporate the heat insulating material, but in FIG. 10, the lid 4 shows a turning locus indicated by a two-dot chain line, and interference with the shoulder member 3, particularly the lid 4. Interference between the rotation center side and the shoulder member 3 is avoided. And in a closed position, the packing 11b provided in the bottom face of the lid body 5, that is, the outer peripheral portion of the lower plate 11, is formed in the upper opening of the inner container 2, specifically, a predetermined dimension downward from the upper flange 2a. The inner container 2 is closed by pressing against the bulging portion 2b bulging inward.

  If the interference position between the lid 4 and the shoulder member 3 is the tip side of the lid 4 (the side opposite to the pivot center), the pivot center is the bulging portion of the inner container 2, that is, the plugging position. It suffices to be positioned in substantially the same horizontal plane. Thereby, the rotation locus | trajectory shown with a dashed-dotted line in FIG. 10 can be obtained.

  Next, the operation of the electric water heater having the above configuration will be described. The description here is also limited to the description of the portion related to the lid 4.

  Liquid is supplied into the inner container 2, and a heater (not shown) provided on the bottom surface of the inner container 2 is energized with the lid 4 closed. According to the lid structure, the concave portion 11a formed in the lower plate 11 of the lid body 4 even when the inside of the inner container 2 is full of water, boils, and is not in time for the discharge of steam from the liquid leakage prevention portion. In this case, a sufficient space is secured, so that the air does not blow out into the lid 4. Moreover, even if it blows out, since the surplus space is formed around the protrusion part which comprises the recessed part 11a of the lower board 11, it does not flow out of the cover body 4 outside.

  And if the liquid in the inner container 2 boils, electricity supply to a heater will be suppressed and it will be in a heat retention state. In this heat retaining state, the heat insulating member 7 having a three-layer structure of the first heat insulating material 14, the vacuum heat insulating material 16, and the second heat insulating material 15 is accommodated in the lid 4. Moreover, an air layer is formed between the first heat insulating material 14 and the vacuum heat insulating material 16 or between the first heat insulating material 14 and the second heat insulating material 15 by the protrusions 15 c formed on the first heat insulating material 14. Therefore, the heat retaining property is very excellent, and the heat radiation through the lid 4 is greatly suppressed.

  In addition, the vacuum heat insulating material 16 in the lid 4 is affected by heat as the liquid temperature in the inner container 2 rises. However, since the seal portion of the vacuum heat insulating material 16 is located on the upper side, the sealing performance is improved. It will not be damaged. For this reason, heat retention performance can be maintained over a long period of time.

It is a perspective view which shows the external appearance of the electric water heater which concerns on this embodiment. It is sectional drawing of FIG. (A) is a perspective view which shows the state which looked at the cover body of FIG. 1 from the upper side, (b) is a perspective view which shows the state seen from the downward side. It is a disassembled perspective view of the cover body shown in FIG. (A) is a perspective view which shows the state which looked at the cover of FIG. 4 from the upper side, (b) is a perspective view which shows the state seen from the downward side. (A) is a perspective view which shows the state which looked at the 2nd heat insulating material of FIG. 4 from the upper side, (b) is a perspective view which shows the state seen from the downward side. (A) is a perspective view which shows the state which looked at the 1st elastic material of FIG. 4 from the upper side, (b) is a perspective view which shows the state seen from the downward side. (A) is a perspective view which shows the state which looked at the cover main body of FIG. 4 from the upper side, (b) is a perspective view which shows the state seen from the downward side. (A) is a perspective view which shows the state which looked at the lower board of FIG. 4 from the upper side, (b) is a perspective view which shows the state seen from the downward side. It is side surface sectional drawing which shows the rotation locus | trajectory of the cover body by the difference in rotation center.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer body 2 ... Inner container 2a ... Gutter part 2b ... Swelling part 3 ... Shoulder member 4 ... Lid body 5 ... Lid body 5a ... Rib 5b ... Hinge part 5d ... Boss part 5d ... Through-hole 6 ... Lid cover 7 ... Heat insulation member 8 ... 1st recessed part 8a ... Rib 9 ... Cylindrical part 10 ... Escape recessed part 10a ... Protrusion 11 ... Lower plate 11a ... Recessed part 11b ... Packing 11c ... Through-hole 12 ... 2nd recessed part 12a ... Boss part 12b ... Steam hole 12c ... Hinge covering part 13 ... Knob 14 ... First heat insulating material 14a ... Groove 14b ... Notch part 14c ... Communication part 15 ... Second heat insulating material 15a ... Notch part 15b ... Communication part 15c ... Protrusion 16 ... Vacuum heat insulating material 17 ... Hinge receiver Part

Claims (4)

Opening and closing the upper opening of the container body, a lid structure having a heat insulation structure,
A lid body in which a steam passage is formed;
A lid cover covering the upper opening of the lid body;
A heat insulating member disposed in an internal space formed by the lid body and the lid cover;
With
The heat insulating member is
A first heat insulating material disposed on the lid body;
A second heat insulating material disposed on the lid cover;
A vacuum heat insulating material disposed between the two heat insulating materials;
A lid structure characterized by comprising:   2. The lid structure according to claim 1, wherein at least one of each of the heat insulating materials and the vacuum heat insulating material is formed with a protruding portion for making point or line contact with each other.   2. The vacuum heat insulating material is disposed in a space formed by the concave portion by forming a concave portion in at least one of the heat insulating materials and overlapping the two heat insulating materials. Or the cover body structure of 2.   The vacuum heat insulating material accommodates a flat core material in a sheet-like bag body, evacuates the inside, seals the opening, and removes the peripheral portion of the bag body protruding from the core material to one side of the core material. 4. The lid structure according to claim 1, wherein the lid body structure is arranged so that the bent side is positioned on the second heat insulating material side.

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