JP6207876B2 - refrigerator - Google Patents

Description

  Embodiment of this invention is related with the refrigerator which improved the heat insulation performance using the vacuum heat insulating material.

  The refrigerator consists of an outer box and an inner box that are entirely box-shaped and the front part is released, and a vacuum heat insulating material is attached to the inside of the outer box, and this vacuum heat insulating material is attached to the outer box. Between the inner box and the inner box is filled with foamed urethane, which is a foam heat insulating material, to form a heat insulating wall, thereby improving the heat insulating performance.

  However, the conventional work of attaching the vacuum heat insulating material inside the outer box in this way and filling the urethane foam between the outer box and the inner box to which the vacuum heat insulating material is attached is not relatively easy. In addition, since a large-scale facility for filling the urethane foam is required and it is uneconomical, a method that can improve the heat insulation performance by a simpler method has been sought.

  In order to improve the heat insulation performance, the refrigerator is provided with a vacuum heat insulating material inside the outer wall portion including the side wall, the rear wall, the upper surface wall, and the door, and is made of hard urethane foam or the like in the gap provided with the vacuum heat insulating material Filled with foam insulation. Vacuum insulation material is made by covering an inner bag made of a synthetic resin film such as polyethylene on a core made of glass wool, etc., wrapping the core, and then coating an aluminum film outside the inner bag. Configured.

The vacuum heat insulating material configured in this way may be configured to be covered with a thin film on the outside, and in that case, it cannot be denied that the surface or the like is damaged. In addition, due to the relatively long lifespan of refrigerators, deterioration of vacuum insulation materials due to aging may be pointed out.On the other hand, there are remarkable technological innovations in vacuum insulation materials, and excellent heat insulation performance, etc. are progressing day by day. Products have been delivered to the market.

  Thus, when the heat insulation performance of a vacuum heat insulating material improves, it is possible to aim at the improvement of the cooling performance of a refrigerator by replacing this improved vacuum heat insulating material with the old vacuum heat insulating material. However, as described above, the gap between the vacuum heat insulating material and the housing of the refrigerator body is filled with the foam heat insulating material, so the vacuum heat insulating material is fixed to the housing by the foam heat insulating material, In practice, there is also a problem that the vacuum heat insulating material cannot be replaced.

  In addition, even when the foam insulation is not filled in the gap between the vacuum insulation and the housing, the outer wall and the door where the vacuum insulation is placed can be easily removed. Therefore, the vacuum heat insulating material cannot be easily exchanged because the vacuum heat insulating material cannot be taken out.

JP 2011-58657 A

  This invention is made | formed in view of the above, The place made into the objective is providing the refrigerator which can replace | exchange a vacuum heat insulating material easily and can measure the update of cooling performance.

The refrigerator of the embodiment is a refrigerator that uses a vacuum heat insulating material for heat insulation, and a concave portion formed in a size capable of accommodating the vacuum heat insulating material on a surface of a portion where the vacuum heat insulating material is used, and the inside of the concave portion A closing plate for closing the vacuum heat insulating material housed in the recess, and at least one of the recesses is provided below the partition wall provided in the refrigerator compartment of the refrigerator, and the closing plate is the recess Is closed from below.

It is a perspective view which shows the partial internal structure of the refrigerator concerning one Embodiment of this invention in the state from which the front door was removed and one side wall part was taken out. It is a perspective view which shows the state in which the in-compartment panel was attached to the left side wall part in the refrigerator shown in FIG. It is sectional drawing of the refrigerator compartment of the upper part of a refrigerator shown by cut | disconnecting a refrigerator in the direction shown by arrow AA in FIG. It is an expanded sectional view of the left side wall part of the refrigerator compartment 5 shown in FIG. It is an expanded sectional view similar to FIG. 4 of the left side wall part of the refrigerator compartment 5 shown in FIG. It is a perspective view which shows the refrigerator concerning other embodiment of this invention in the state in which a part of right outer wall part was decomposed | disassembled and taken out. It is sectional drawing of the freezer compartment of the lower part of the refrigerator shown by cut | disconnecting a refrigerator in the direction shown by arrow BB in FIG. It is the elements on larger scale of the side wall part of the freezer compartment shown in FIG. It is a perspective view which shows the refrigerator concerning another embodiment of this invention in the state by which the upper freezer compartment was pulled out. It is sectional drawing which shows the cross section of the refrigerator shown in FIG. 9 is a perspective view showing the refrigerator shown in FIG. 9 with the front door, the ice making room, and the upper freezer compartment removed, and the bottom plate, the vacuum heat insulating material, and the closing plate between the refrigerator compartment and the upper freezer compartment removed. FIG. It is sectional drawing which shows the structure between the refrigerator compartment and upper freezer compartment of the refrigerator shown in FIG. It is a perspective view which shows the refrigerator of another embodiment of this invention. It is a perspective view which shows the back part side of the refrigerator shown in FIG. It is a perspective view which shows the state which removed the obstruction board and the vacuum heat insulating material from the back part of the refrigerator of FIG. It is a perspective view which shows the back surface part of the refrigerator of another embodiment of this invention. It is a perspective view which shows the back surface part of the refrigerator of another embodiment of this invention. It is a longitudinal cross-sectional view which cut | disconnects and shows a refrigerator in the direction shown by arrow CC in FIG. It is a perspective view which shows the shape of the vacuum heat insulating material shown in FIG. It is a longitudinal cross-sectional view which cut | disconnects and shows the refrigerator of another embodiment of this invention. It is a perspective view which shows the shape of the vacuum heat insulating material shown in FIG. It is a perspective view which shows the refrigerator of another embodiment of this invention. It is a perspective view which shows the back part side of the refrigerator shown in FIG. It is a perspective view which shows the state which removed the back plate from the lower part of the back part of the refrigerator of FIG. It is a perspective view which shows the state which removed the compressor stand from the compressor storage chamber of FIG. It is a perspective view which shows the state from which the vacuum heat insulating material and the closing plate were removed from the back part of the refrigerator of FIG. It is a longitudinal cross-sectional view in the DD line in the refrigerator shown in FIG. It is a perspective view which shows the refrigerator of another embodiment of this invention, and shows the state from which the obstruction board was removed from the side wall part. It is a perspective view which shows the back part side of the refrigerator shown in FIG. 28, and shows the state from which the obstruction board and two vacuum heat insulating materials were removed. It is a figure which shows the longitudinal cross-section in the EE line in the refrigerator of FIG. Fig. 4 illustrates yet another embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  FIG. 1 is a perspective view showing the structure of a refrigerator according to an embodiment of the present invention in a state where a front door is removed and a part of a left side wall portion is taken out. The refrigerator 1 shown in FIG. 1 is configured by a casing 3 formed by sandwiching a heat insulating material between an outer box and an inner box that are entirely box-shaped and opened at the front, and the box-shaped casing 3 is opened. The door is attached to the front part so as to be openable and closable. For example, a door such as a double door or a single door on the front side of the refrigerator compartment 5 located at the uppermost part in order to store and refrigerate the refrigerator is provided. The illustration is omitted.

  An ice making room 7 and an upper freezing room 9 called a switching room that can be changed to any cooling state from refrigeration to freezing are provided side by side immediately below the uppermost refrigerating room 5. A freezing chamber 11 is provided at the bottom immediately below the upper freezing chamber 9. Further, the ice making chamber 7 and the upper freezing chamber 9 are respectively covered on the front side with drawer-type doors 7a and 9a, and the freezing chamber 11 is also covered on the front side with a drawer-type door 11a, and these drawer-type doors 7a, 9a and 11a are covered. The ice making chamber 7, the upper freezing chamber 9, and the freezing chamber 11 are extracted to the outside by pulling out each of them.

  As described above, the left side wall portion 3a of the housing 3 whose front portion is opened has its inner plate constituting the inner box of the housing 3 cut off (the inner plate is not shown), and the outer box of the housing 3 is removed. The inside of the outer plate 13 is exposed and visible. A space, that is, a recess is formed in the exposed inner portion of the outer plate 13 by an amount corresponding to the removed inner plate, and a vacuum heat insulating material 15 shown in FIG. It is arranged.

  With such a configuration, when filling a heat insulating material such as foamed polyurethane, the vacuum heat insulating material 15 does not block the inflow of the foamed polyurethane, so that the fluidity of the foamed polyurethane is improved and the foamed polyurethane is filled without a gap. Can do.

  After the vacuum heat insulating material 15 is disposed in the recess on the inner side of the outer plate 13 as described above, the internal panel 17 constituting the lid or the closing plate is connected to the side wall portion by the fixing screw 19 from the inner side of the vacuum heat insulating material 15. The vacuum heat insulating material 15 is fixedly disposed between the outer plate 13 and the internal panel 17 by being screwed to the inner box 3a or the outer plate 13a. Thereby, the vacuum heat insulating material 15 is prevented from dropping, shifting, or easily removed from the recess. FIG. 2 is a view showing a state in which the interior panel 17 is attached to the inner box or the outer plate 13 of the side wall 3a with the vacuum heat insulating material 15 interposed therebetween. In addition, as can be seen from the figure, the internal panel 17 is provided with a plurality of shelf supports for holding both ends of a plurality of shelves provided in the refrigerator compartment 5.

  3 is a cross-sectional view of the refrigerator compartment 5 at the top of the refrigerator 1 shown by cutting the refrigerator 1 in the direction indicated by the arrow AA in FIG. As shown in FIG. 3, the vacuum heat insulating material 15 is provided not only on the left side wall portion 3 a of the refrigerator 1 but also on the right side wall portion 3 b with the same structure. Further, as can be seen from FIG. 3, the vacuum heat insulating material 15 is disposed in a recess formed by removing the inner plate constituting the inner box. The vacuum heat insulating material 15 is disposed outside the recess. A gap 21 is formed between the vacuum heat insulating material 15 and the outer plate 13 instead of being closely arranged inside the plate 13 without a gap. And although it is what is not shown in figure and this foam heat insulating material which is hard urethane foam is arrange | positioned in this clearance gap 21, this foam heat insulating material is not fixedly attached to the vacuum heat insulating material 15, The vacuum heat insulating material 15 can be easily separated from the foam heat insulating material. In addition, the heat insulating material arrange | positioned in the said clearance gap 21 is not restricted to urethane, Other heat insulating materials, such as a styrene, may be used.

  That is, the foam heat insulating material is not directly filled into the gap between the vacuum heat insulating material 15 and the outer plate 13 by using the foaming property of the foam heat insulating material from the container containing the foam heat insulating material. For example, after being filled and stored in a container or the like formed in advance in the shape of a gap, it is provided in the gap.

  FIG. 4 is an enlarged cross-sectional view of the left side wall 3a of the refrigerator compartment 5 shown in FIG. From FIG. 4, it can be seen that the upper and lower ends of the interior panel 17 disposed inside the vacuum heat insulating material 15 are fixedly attached to the upper and lower sides of the side wall 3 a by the fixing screws 19.

  5 is an enlarged cross-sectional view of the left side wall portion 3a of the refrigerator compartment 5 shown in FIG. 3, as in FIG. 4. In FIG. 4, the internal panel 17 is fixed as shown in FIG. The internal panel 17 is fixedly attached to the side wall 3 a by using the fixing hook 23 instead of the fixing screw 19 instead of being fixedly attached to the side wall 3 a by the screw 19.

  That is, on the outer surface of the upper and lower end portions of the internal panel 17, that is, the outer surface facing the outer plate 13, a fixing hook 23 having a hook-shaped portion whose front end is bent downward is attached. In addition, the inner panel 17 is fixedly attached to the side wall portion 3a by hooking the hook-shaped portion of the fixing hook 23 into a slit-like recess formed in a corresponding portion of the side wall portion 3a.

  In the refrigerator 1 according to the present embodiment configured as described above, the vacuum heat insulating material 15 is disposed on the side wall portions 3a and 3b, and the vacuum heat insulating material 15 is provided on the inner plate of the side wall portions 3a and 3b. In addition to being disposed in the removed recess, the interior panel 17 is fixedly attached to the inside of the vacuum heat insulating material 15 by the fixing screw 19 or the fixing hook 23, so that the vacuum heat insulating material 15 does not fall, come off, or be exposed. Thus, the heat insulating performance of the side wall portions 3a and 3b on the side of the refrigerator compartment 5 of the refrigerator 1 is improved, and can be easily assembled.

  Therefore, when the vacuum heat insulating material 15 is developed, for example, when a new product with improved function is developed or broken, the fixing screw 19 or the fixing hook 23 is removed, the internal panel 17 is removed, and the vacuum insulating material 15 is already accommodated. The replacement such as taking out the vacuum heat insulating material 15 and replacing it with a new vacuum heat insulating material can be performed simply and efficiently in a short time. As a result, the cooling performance of the refrigerator 1 can be maintained without having to replace the refrigerator, for example, and a new improved vacuum heat insulating material with improved heat insulation performance has been developed. The used vacuum heat insulating material 15 can be taken out as described above, and an improved new vacuum heat insulating material can be put in place thereof, so that the cooling performance of the refrigerator 1 can be improved more than ever.

  In the present embodiment, the upper inner plate of the left and right side wall portions 3a of the refrigerator 1 is cut out to form a recess, and the vacuum heat insulating material 15 is disposed in the recess and is closed by the interior panel 17. However, a similar structure may be provided on the back side of the upper part of the refrigerator 1, that is, on the back wall part on the back side of the refrigerator compartment 5.

  FIG. 6 is a perspective view showing a refrigerator according to another embodiment of the present invention, with a part of the lower portion of the right side wall portion disassembled and taken out. The refrigerator 10 shown in FIG. 6 has side doors of the outer plate 31 that constitutes the outer box of the housing 3 while double doors 5a and 5b are attached to the front opening of the refrigerator compartment 5 in the refrigerator 1 shown in FIG. The outer plate 31 constituting the lower portion of the portion 3b, that is, the lower portion of the side wall portion 3b located on the side of the upper freezing chamber 9 and the freezing chamber 11 is partially cut away to form a concave portion 25 therein. A vacuum heat insulating material 27 is disposed in the recess 25, and an outer wall panel 29, which is a lid or a closing plate, is fixedly attached from above the vacuum heat insulating material 27 to close the recess 25. 27 is greatly different, and other configurations are the same as those in FIG. 1, and the same components are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in the refrigerator 10 shown in FIG. 6, the lower part of the outer plate 31 constituting the side wall 3b is partly cut to form a recess 25, and a vacuum heat insulating material 27 is disposed in the recess 25, and this vacuum The outer wall panel 29 is fixedly attached from the outside to the concave portion 25 in which the heat insulating material 27 is disposed, the concave portion 25 is closed, and the vacuum heat insulating material 27 in the concave portion 25 comes out of the concave portion 25, falls, or is exposed. Thus, the heat insulation performance of the lower part of the side wall 3b of the refrigerator 10 is improved.

  FIG. 7 is a cross-sectional view of the freezer compartment 11 at the bottom of the refrigerator 10 shown by cutting the refrigerator 10 in the direction indicated by arrow BB in FIG. 6. As shown in FIG. 7, the outer plate 31 constituting the lower side wall portion 3 b of the refrigerator 10 is partially cut out to form a recess 25, and a vacuum heat insulating material 27 is disposed in the recess 25. It can be seen that the structure closed at 29 is formed not only on the right side wall 3 b of the refrigerator 10 but also on the left side wall 3 a of the refrigerator 10 with the same structure. In addition, the same code | symbol is attached | subjected with respect to the recessed part 25, the vacuum heat insulating material 27, and the outer wall panel 29 which were provided in this left side wall part 3a.

  In addition, the method of fixedly attaching the outer wall panel 29 so as to close the recess 25 in which the vacuum heat insulating material 27 is disposed is performed by using a fixing screw 33 as shown in FIG. However, the present invention is not limited to this. In the present embodiment, the left and right side wall portions 3a and 3b at the lower part of the refrigerator 10 are formed with recesses 25, provided with a vacuum heat insulating material 27, and closed with an outer wall panel 29. It may be provided on the back side of the lower part of the refrigerator 10, that is, on the back wall part on the back side of the freezer compartment 11.

  In the refrigerator 10 of the present embodiment configured as described above, the vacuum heat insulating material 27 is disposed below the side wall portions 3a and 3b. The vacuum heat insulating material 27 is disposed below the side wall portions 3a and 3b. And the outer wall panel 29 is fixedly attached to the outside of the vacuum heat insulating material 27 so that the vacuum heat insulating material 27 does not fall, come off, or be exposed. Thereby, the heat insulation performance of the side wall portions 3a and 3b on the side of the freezer compartment 11 of the refrigerator 10 is improved, and can be easily assembled.

  Therefore, when the vacuum heat insulating material 27 is deteriorated or broken, the outer wall panel 29 is removed, the deteriorated or damaged vacuum heat insulating material 27 is taken out, and a new vacuum heat insulating material is disposed instead. Can be performed easily and efficiently in a short time. For example, the cooling performance of the refrigerator 1 can be maintained without replacement of the refrigerator, and an improved new vacuum with improved heat insulation performance can be maintained. In the case where a heat insulating material is developed, the vacuum heat insulating material 27 currently used is taken out, and a new improved vacuum heat insulating material is inserted instead, and the cooling performance of the refrigerator 10 is improved more than before. be able to.

  FIG. 9 is a perspective view showing a refrigerator according to another embodiment of the present invention with the upper freezer compartment 9 pulled out. As will be described later, the refrigerator 111 shown in FIG. 9 is provided with a vacuum heat insulating material between the upper freezer compartment 9 and the refrigerator compartment 5, which is relatively hot heated by, for example, a microwave oven or the like. In order to prevent the effect of the temperature of the high-temperature stored item from affecting the stored item in the upper refrigerator compartment 5 when the high-temperature stored item is stored in the upper freezer compartment 9 for quick freezing. The material is provided between the upper freezer compartment 9 and the refrigerator compartment 5.

  FIG. 10 is a cross-sectional view of the refrigerator 111 shown in FIG. As shown in FIG. 10, the refrigerator 111 of the present embodiment is provided with a vacuum heat insulating material 43 in a concave portion that is a space between the bottom plate 41 of the refrigerator compartment 5 and the closing plate 45 that is the upper plate of the upper freezer compartment 9. It has been. For example, when the vacuum heat insulating material 43 is deteriorated or damaged, the lower closing plate 45 can be removed by, for example, screwing so that it can be easily taken out and replaced with a new vacuum heat insulating material as will be described later. It is attached. The closing plate 45 constitutes a closing plate.

  That is, when it is desired to replace the vacuum heat insulating material 43 provided between the refrigerator compartment 5 and the upper freezer compartment 9, the pull-out type upper freezer compartment 9 is pulled out and taken out, and the upper freezer compartment 9 is pulled out from the front surface. An operator reaches out from the opening to the lower side of the closing plate 45, removes the screw fixing the closing plate 45 with, for example, a screwdriver, takes out the closing plate 45, and removes the opening from the opening of the closing plate 45. The vacuum heat insulating material 43 can be taken out.

  FIG. 11 is a perspective view showing the refrigerator 111 shown in FIG. 9 in a state in which the bottom plate 41, the vacuum heat insulating material 43, and the closing plate 45 described above are taken out and disassembled. As shown in FIG. 11, the vacuum heat insulating material 43 is provided so as to be sandwiched between a bottom plate 41 of the refrigerator compartment 5 and a closing plate 45 which is an upper plate of the upper freezer compartment 9. The vacuum heat insulating material 43 is about half the size of the closing plate 45 so as to cover only the upper freezer compartment 9 portion. In FIG. 11, the bottom plate 41 is drawn out to the outside, but the bottom plate 41 is illustrated at the bottom of the refrigerator compartment 5 as indicated by a two-dot chain line.

  FIG. 12 is a partial enlarged cross-sectional view showing in detail a state in which the closing plate 45 of the refrigerator 111 shown in FIG. 9 is attached. As shown in FIG. 12, the vacuum heat insulating material 43 is provided in a concave portion between the bottom plate 41 of the refrigerator compartment 5 and the closing plate 45 of the upper freezer compartment 9. A part of the inner plate on the rear side of the refrigerator 111 located on the back side of the portion to be stored is bent at a right angle toward the inner side of the front side to form a hook receiving portion 47, and this hook The front end of the closing plate 45 is placed on and received by the receiving portion 47, and the other end of the closing plate 45, that is, the other end of the closing plate 45 on the front opening side of the upper freezing chamber 9 is the upper refrigeration. It extends straight below the partition wall portion between the chamber 9 and the refrigerator compartment 5, and a screw 49 is screwed into this extended portion to fix the other end of the closing plate 45, thereby fixing the closing plate 45 as a whole. It is fixed to.

  Therefore, when it is desired to replace the vacuum heat insulating material 43, the upper freezer compartment 9 is taken out from the front side, and an operator puts a hand through the taken out front opening and stops the other end of the closing plate 45. Since the closing plate 45 can be taken out from the front opening by removing it with a screwdriver, the vacuum heat insulating material 43 can be similarly taken out after the closing plate 45 is taken out in this way. The screw 49 on the front opening side can be removed by using a long screwdriver from the front lower side of the front opening, but the screw head is inclined to the front opening side. It is also possible to attach the screw 49 diagonally, and by attaching the screw 49 diagonally in this way, the screw 49 can be easily removed.

  The method for attaching the closing plate 45 is not limited to the above method, and various methods are conceivable. In short, the vacuum heat insulating material 43 is accommodated in a recess or the like and surrounded entirely, and from the outside. What is necessary is just to be able to take out comparatively easily in order to protect the scratch etc. so that it may not be attached and to facilitate replacement of the vacuum heat insulating material 43.

  Further, in FIG. 12, it is illustrated that the high-temperature storage item 51 is stored in the upper freezer compartment 9 and the refrigerating chamber storage item 53 is stored in the refrigerating chamber 5. Therefore, even if it is stored in the upper freezer compartment 9, the heat of the high-temperature stored item 51 is blocked by the vacuum heat insulating material 43 and hardly transmitted to the refrigerator compartment 5. The stored item 53 is not easily affected by the heat of the high-temperature stored item 51 in the upper freezer compartment 9.

  The same applies to the case of applying to the doors of the refrigerator compartment 5, the upper freezer compartment 9 and the freezer compartment 11.

  FIG. 13 is a perspective view showing a refrigerator according to another embodiment of the present invention. In the refrigerator 1 </ b> A shown in FIG. 13, front doors 5 </ b> A and 5 </ b> B are provided in the refrigerator compartment 5. A refrigerator 1A shown in FIG. 13 is configured by a housing 3 formed by sandwiching a heat insulating material between an outer box and an inner box that are entirely box-shaped and opened at the front.

  An ice making room 7 and an upper freezing room 9 are provided side by side immediately below the uppermost refrigerating room 5, and a freezing room 11 is provided at the lowermost part immediately below the ice making room 7 and the upper freezing room 9. Is provided. Further, the ice making chamber 7 and the upper freezing chamber 9 are respectively covered on the front side with drawer doors 7a and 9a, and the freezing chamber 11 is also covered on the front side with a drawer door 11a. By pulling out these drawer type doors 7a, 9a and 11a forward, the ice making room 7, the upper freezing room 9 and the freezing room 11 are taken out to the outside.

  FIG. 14 is a perspective view showing the back surface 100 side of the refrigerator 1A shown in FIG. FIG. 15 is a perspective view showing a state in which the closing plate 101 and the vacuum heat insulating material 102 are removed from the back surface portion 100 of the refrigerator 1A of FIG.

  As shown in FIG. 15, the vacuum heat insulating material 102 is a rectangular plate member, and is a member for insulating the back surface portion 100 side. A recess 103 is provided in the back surface portion 100 of the refrigerator 1A. The recess 103 has a rectangular shape that is long in the vertical direction, and is accommodated in the recess 103 by fitting the vacuum heat insulating material 102 therein.

  A closing plate 101 shown in FIG. 15 is a lid member for covering the vacuum heat insulating material 102. The closing plate 101 is, for example, a metal rectangular plate member, and the vertical and horizontal sizes of the closing plate 101 are larger than the vertical and horizontal sizes of the vacuum heat insulating material 102.

  Holes 104 are provided at a plurality of corners of the closing plate 101. The back surface portion 100 is provided with nut portions 106 at a plurality of locations around the recess 103. As a result, the fixing screw 105 as a fastening part passes through these holes 104 and is screwed into the nut portion 106, so that the closing plate 101 fits the vacuum heat insulating material 102 into the recess 103 of the back surface portion 100. It can be pressed and fixed in the state. Moreover, since the vertical and horizontal sizes of the blocking plate 101 are larger than the vertical and horizontal sizes of the vacuum heat insulating material 102, it is not necessary to provide holes for the fixing screws 105 to pass through the vacuum heat insulating material 102.

  The vacuum heat insulating material 102 is formed by, for example, wrapping a glass wool plate-shaped core material with a covering material such as a laminate film, and forming the inside into a vacuum porous structure, thereby achieving a high vacuum space ratio (for example, 90%). Is held). For this reason, this vacuum heat insulating material 102 can exhibit the high heat insulation performance by a vacuum. Since the heat insulation performance of the vacuum heat insulating material 102 is considerably higher than the heat insulation performance of the polyurethane foam material, the heat insulation performance of the back surface portion 100 of the refrigerator 1A can be ensured even if the vacuum heat insulating material 102 having a small thickness is used.

  In the embodiment shown in FIG. 15, the vacuum heat insulating material 102 can be easily replaced on the back surface portion 100. The vacuum heat insulating material 102 can be fixed by being fitted in the concave portion 103 of the back surface portion 100, and direct application of external impact to the vacuum heat insulating material 102 can be prevented.

  FIG. 16 is a perspective view showing a back surface portion of a refrigerator 1B according to still another embodiment of the present invention.

  The structure of the back surface portion 110 of the refrigerator 1B shown in FIG. 16 is substantially the same as the structure of the back surface portion 100 of the refrigerator 1A shown in FIG. Is omitted.

  The structure of the back surface portion 110 of the refrigerator 1B shown in FIG. 16 is different from the structure of the back surface portion 100 of the refrigerator 1A shown in FIG. The closing plate 111 is provided with a plurality of reinforcing concavo-convex portions 118 so as to be parallel to each other along the vertical direction of the refrigerator.

  A plurality of reinforcing concavo-convex portions 118 are formed along the longitudinal direction of the closing plate 111 to reinforce the strength of the flat closing plate 111. Holes 104 are provided at a plurality of corners of the closing plate 101. Thereby, it can prevent that the obstruction board 111 deform | transforms and escapes with the pressing force from the vacuum heat insulation board 102 which generate | occur | produces by pressing the obstruction board 111 against the vacuum heat insulation board 102. For this reason, the back surface part 110 can be reliably insulated by the vacuum heat insulating material 102 without generating a gap.

  In the embodiment shown in FIG. 16, the vacuum heat insulating material 102 can be easily replaced on the back surface portion 110. The vacuum heat insulating material 102 can be fixed by being fitted in the concave portion 103 of the back surface portion 110, and direct application of external impact to the vacuum heat insulating material 102 can be prevented.

  FIG. 17 is a perspective view showing a back surface portion of a refrigerator 1C according to still another embodiment of the present invention.

  The structure of the back surface portion 120 of the refrigerator 1C shown in FIG. 17 is substantially the same as the structure of the back surface portion 100 of the refrigerator 1A shown in FIG. Is omitted.

  The structure of the back surface portion 120 of the refrigerator 1C shown in FIG. 17 is different from the structure of the back surface portion 100 of the refrigerator 1A shown in FIG. The closing plate 121 is provided with, for example, two concave portions 125. These concave portions 125 are circular concave portions, and a hole portion 127 through which the fixing screw 105 is passed is provided in the center portion.

  On the other hand, two convex portions 126 are provided in the concave portion 103 of the back surface portion 120. These convex portions 126 are circular convex portions and are located at positions corresponding to the concave portions 125 of the closing plate 121. A nut portion 128 for screwing the fixing screw 105 is provided at the center of the convex portion 126. The diameter of the convex portion 126 and the diameter of the concave portion 125 of the closing plate 121 are preferably the same.

  As a result, the fixing screw 105 as a fastening member passes through the fixing screw 105 through each hole 104 of the closing plate 121 and the hole 129 of the concave portion 125 of the closing plate 121, and the nut portion 106 and the nut portion of the recess 103. By screwing each into 128, the closing plate 121 can press the vacuum heat insulating material 102 in a state of being fitted in the recess 103 of the back surface portion 120, and can be stably fixed.

  Since the fixing screw 105 is used in this way, it is possible to prevent the blocking plate 121 from being deformed or escaped by the pressing force from the vacuum heat insulating plate 102 generated by pressing the closing plate 121 against the vacuum heat insulating plate 102. it can.

  In addition, the closing plate 121 is fixed to the back surface portion 110 side by the fixing screw 105 in a state where the two recessed portions 125 of the closing plate 121 are in contact with the two convex shape portions 127 of the recessed portion 103 of the back surface portion 110. Therefore, the surface pressure when the closing plate 121 is fixed can be stabilized, and the fixing state of the closing plate 121 can be stabilized.

  In the embodiment shown in FIG. 17, the vacuum heat insulating material 102 can be easily replaced on the back surface portion 120. The vacuum heat insulating material 102 can be fixed by being fitted in the concave portion 103 of the back surface portion 120, and direct application of external impact to the vacuum heat insulating material 102 can be prevented.

  18 is a longitudinal sectional view showing the refrigerator 1A cut in the direction indicated by the arrow CC in FIG.

  As shown in FIG. 18, a recessed portion 103 of the back surface portion 100 of the refrigerator 1 </ b> A is provided, and a vacuum heat insulating material 102 is fitted in the recessed portion 103. The vacuum heat insulating material 102 is a flat rectangular member as shown in FIG. The closing plate 101 is fixed to the back surface portion 100 by a fixing screw 105 so as to be pressed against the vacuum heat insulating plate 102. The urethane foam heat insulating material 130 is arrange | positioned at the lower part in the back surface part 100 of 1 A of refrigerators. Instead of the closing plate 101, a closing plate 111 shown in FIG. 16 may be used.

  FIG. 20 is a longitudinal sectional view showing the refrigerator 1D by cutting.

  As shown in FIG. 20, a recess 103 of the back surface portion 110 of the refrigerator 1 </ b> D is provided, and a vacuum heat insulating material 132 is fitted in the recess 103. The closing plate 121 is fixed to the back surface portion 110 with a fixing screw 105 so as to press the vacuum heat insulating plate 132 against the back surface portion 110. The urethane foam heat insulating material 130 is arrange | positioned at the lower part in the back part 100 of refrigerator 1D.

  The vacuum heat insulating material 132 has, for example, two circular through holes 140 as shown in FIG. As shown in FIG. 20, these through holes 140 can be accommodated by fitting convex portions 125 </ b> T inside the concave portions 125 of the blocking plate 121. Thus, by providing the through hole 140 in the vacuum heat insulating material 132, the convex portion 125 </ b> T inside the concave shaped portion 125 of the closing plate 121 does not hit the vacuum heat insulating material 132. For this reason, it can avoid that the vacuum heat insulating material 132 and the obstruction board 121 interfere, or the part which escapes arises, and the obstruction board 121 adheres to the vacuum heat insulation material 132 in the state which stabilized the surface pressure. And can be fixed stably.

  As shown in FIG. 20, the vacuum heat insulating material 132 includes a heat insulating plate-like core material 150 such as glass wool, and a laminate film 151 that is a covering material that covers the core material 150. Moreover, the laminate film 151 has a welded portion 152 by welding. The welded portion 152 covers the inner wall portion 141 of the through hole 140 of the vacuum heat insulating material 132. Thereby, since the inner wall part 141 of the through hole 140 of the vacuum heat insulating material 132 is covered with the welding part 152 of the laminate film 151 which is a coating | covering material, the through hole of the vacuum heat insulating material 132 is prevented so that the core material 150 may not be exposed. The inner wall portion 141 of 140 can be protected, and the core material 150 is not in direct contact with the fixing screw 105, so that the core material 150 is not damaged by the fixing screw 105.

  The fixing screw 105 as a fastening part is screwed into the nut portion 106 of the back surface portion 110 through the hole portion 129 of the concave portion 125 of the closing plate 121 and the through hole 140 of the vacuum heat insulating material 132. Thereby, the obstruction board 121 can press and fix the vacuum heat insulating material 132 to the back surface part 110 side. Since the fixing screw 105 is used in this way, the blocking plate 121 is prevented from being deformed or escaped by the pressing force from the vacuum heat insulating plate 132 generated when the closing plate 121 is pressed against the vacuum heat insulating plate 132. Can do.

  In the embodiment shown in FIG. 20, the vacuum heat insulating material 132 can be easily replaced on the back surface portion 110. The vacuum heat insulating material 132 can be fixed by being fitted in the concave portion 103 of the back surface portion 110, and application of a direct impact to the vacuum heat insulating material 132 from the outside can be prevented.

  FIG. 22 is a perspective view showing a refrigerator according to another embodiment of the present invention. In the refrigerator 1A shown in FIG. 22, the refrigerator compartment 5 is provided with front doors 5A and 5B. The refrigerator 1A shown in FIG. 22 is configured by a casing 3 that is formed by sandwiching a heat insulating material between an outer box and an inner box that are entirely box-shaped and open at the front.

  An ice making chamber 7 and an upper freezing chamber 9 are provided side by side immediately below the uppermost refrigerating chamber 5, and a freezing chamber 11 is provided at the lowermost portion immediately below the ice making chamber 7 and the upper freezing chamber 9. It has been. The ice making chamber 7 and the upper freezing chamber 9 are respectively covered on the front side with drawer doors 7a and 9a, and the freezing chamber 11 is also covered on the front side with a drawer door 11a. These drawer doors 7a, 9a and 11a The ice making chamber 7, the upper freezing chamber 9, and the freezing chamber 11 are extracted to the outside by pulling each of them forward.

  FIG. 23 is a perspective view showing the back surface 100 side of the refrigerator 1A shown in FIG. FIG. 24 is a perspective view showing a state in which the rear plate 301 is removed from the back surface portion 100 of the refrigerator 1A of FIG. FIG. 25 is a perspective view showing a state where the compressor base 305 is removed from the compressor storage chamber 310 of FIG.

  As shown in FIGS. 23 to 24, the rear plate 301 is removed from the lower portion 302 of the back surface portion 100 of the refrigerator 1A. As shown in FIG. 24, a compressor storage chamber 310 is provided in the lower portion 302. ing. In the compressor storage chamber 310, a compressor 304 and a compressor stand 305 are disposed. As shown in FIGS. 24 to 25, the compressor base 305 is removed from the compressor storage chamber 310 of FIG.

  FIG. 26 is a perspective view showing a state in which the vacuum heat insulating material 306 and the closing plate 307 are removed from the lower portion 302 of the back surface portion 100 of the refrigerator 1A of FIG. FIG. 27 is a longitudinal sectional view taken along the line DD in the refrigerator 1A shown in FIG.

  As shown in FIGS. 26 and 27, the back surface portion 100 is formed with a concave portion 109. The vacuum heat insulating material 306 is disposed so as to be fitted into the concave portion 109 of the back surface portion 100 in order to insulate the compressor storage chamber 310 of the refrigerator.

  The closing plate 307 that is a lid member is, for example, a metal rectangular plate member. The size of the blocking plate 307 is larger than the size of the vacuum heat insulating material 306. The closing plate 307 is formed, for example, by being bent at a plurality of locations in accordance with the shape of the compressor storage chamber 310, and has a first surface portion 307A, a second surface portion 307B, and a third surface portion 307C. The first surface portion 307A is a vertical surface formed along the vertical direction of the refrigerator 1A. The second surface portion 307B is continuous from the first surface portion 307A and is parallel to the horizontal plane of the refrigerator 1A. And as shown in FIG. 27, 3rd surface part 307C is inclined and formed toward the front side of refrigerator 1A with the predetermined angle (theta) with respect to 2nd surface part 307B.

  In contrast, the vacuum heat insulating material 306 has a first portion 306A, a second portion 306B, and a third portion 306C. The first portion 306A is formed corresponding to the shape of the first surface portion 307A of the closing plate 307, and the second portion 306B is formed corresponding to the shape of the second surface portion 307B of the closing plate 307. The third portion 306 </ b> C is formed corresponding to the shape of the first surface portion 307 </ b> C of the closing plate 307. That is, the first portion 306A is a vertical surface formed along the vertical direction of the refrigerator 1A. The second portion 306B is continuous from the first portion 306A and is parallel to the horizontal plane of the refrigerator 1A. As shown in FIG. 27, the third portion 306C is formed to be inclined toward the front side of the refrigerator 1A at a predetermined angle θ with respect to the second portion 306B.

  As shown in FIGS. 26 and 27, the concave portion 109 of the back surface portion 100 is formed at a position corresponding to the front portion and the upper portion of the compressor storage chamber 310. As shown in FIG. 26, the concave portion 109 has a first concave portion 109A, a second concave portion 109B, and a third concave portion 109C. As shown in FIG. 27, the first concave portion 109A accommodates the first portion 306A of the vacuum heat insulating material 306, and the second concave portion 109B accommodates the second portion 306B of the vacuum heat insulating material 306. The third concave portion 109C accommodates the third portion 306C of the vacuum heat insulating material 306. The vacuum heat insulating material 306 can be disposed by being inserted into the recessed portion 109 from the side of the refrigerator.

  As shown in FIGS. 26 and 27, holes 312 are provided at a plurality of corners of the closing plate 307. Nuts 113 are provided on the back surface 100 at a plurality of locations around the concave portion 109. The fixing screw 308 as a fastening part is passed through these holes 312 and screwed into the nut portion 113, so that the closing plate 307 covers the vacuum heat insulating material 306 from above so that the upper part of the compressor storage chamber 310 is covered. It can fix in the state where it inserted from the back of the refrigerator in the concave-shaped part 109 in position. Thereby, the front side part and the upper side part of the compressor storage chamber 310 can be covered and insulated by the vacuum heat insulating material 306. Moreover, since the size of the blocking plate 307 is larger than the size of the vacuum heat insulating material 306, the fixing screw 308 does not need to be provided with a hole for allowing the fixing screw to pass through.

  The vacuum heat insulating material 306 is formed by, for example, wrapping a glass wool plate-shaped core material with a covering material such as a laminate film, and forming the inside thereof into a vacuum porous structure, thereby achieving a high vacuum space ratio (for example, 90%). Is held). For this reason, this vacuum heat insulating material 306 can exhibit the high heat insulation performance by a vacuum. The heat insulating performance of the vacuum heat insulating material 306 is considerably higher than the heat insulating performance of the polyurethane foam material. For this reason, even if the thin vacuum heat insulating material 306 is used, the vacuum heat insulating material 306 can insulate the heat of the compressor 304 generated during operation in the front side portion and the upper side portion of the compressor storage chamber 310. .

  As shown in FIG. 26, the vacuum heat insulating material 306 fixes the closing plate 307 using a plurality of fixing screws 308. This facilitates the work of attaching the vacuum heat insulating material 306 when assembling the refrigerator. In addition, when the vacuum heat insulating material 306 changes over time or when a predetermined replacement time for the vacuum heat insulating material 306 is reached, it is easy to remove the vacuum heat insulating material 306 and replace it with a new vacuum heat insulating material 306.

  Further, since the closing plate 307 covers the vacuum heat insulating material 306 and is fastened by the fixing screw 308, it is possible to prevent external shock from being directly applied to the vacuum heat insulating material 306.

  As shown in FIG. 27, the urethane foam heat insulating material 311 is disposed in the upper region of the vacuum heat insulating material 306 in the back surface portion 100.

  Further, as shown in FIGS. 25 to 26, the vacuum heat insulating material 306 and the closing plate 307 can be removed from the back surface portion 100 by removing the plurality of fixing screws 308. Thereby, the vacuum heat insulating material 306 can be replaced.

  Next, a refrigerator according to still another embodiment of the present invention will be described.

  FIG. 28 is a perspective view showing a refrigerator 1B according to still another embodiment of the present invention and showing a state in which the closing plate 340 is removed from the side wall portion 3b. FIG. 29 is a perspective view showing the back surface 100 side of the refrigerator 1B shown in FIG. 28 and showing a state in which the closing plate 340 and the two vacuum heat insulating materials 351 and 352 are removed. FIG. 30 is a view showing a longitudinal section taken along line EE in the refrigerator 1B of FIG.

  In addition, the same code | symbol is attached | subjected to the location similar to refrigerator 1A shown in FIG. 31 and refrigerator 1B shown in FIGS. 28-30 is abbreviate | omitted.

  As shown in FIGS. 28 and 29, a rectangular recess 160 is formed in the side wall 3b of the refrigerator 1D. The recess 160 can be closed by a rectangular closing plate 340 that is a side plate or a lid member. The closing plate 340 is, for example, a metal plate, and holes 312 are provided at a plurality of locations at the corners of the closing plate 340. On the other hand, as shown in FIGS. 28 and 29, nuts 163 are provided at a plurality of locations in the recess 160 of the side wall 3b.

  As shown in FIGS. 29 and 30, the compressor storage chamber 310 stores a compressor 304. The compressor storage chamber 310 is provided with two bag-shaped recesses 171 and 172. The two bag-like recesses 171 and 172 are formed along the width direction of the refrigerator 1D.

  As shown in FIG. 30, one bag-shaped recess 171 is disposed at the upper portion of the compressor storage chamber 310, and the other bag-shaped recess 172 is disposed inclined to the front side of the compressor storage chamber 310. Yes. In these bag-like recesses 171 and 172, vacuum heat insulating materials 351 and 352 are detachably inserted and held, respectively. As shown in FIG. 29, the insertion openings 171P and 172P are provided in the recess 160 in order to insert the vacuum heat insulating materials 351 and 352.

29 are inserted into the recesses 171 and 172 as shown in FIG. 30 from the insertion openings 171P and 172P. Then, the fixing screw 308 as a fastening part shown in FIG. 29 is passed through the hole 312 of the closing plate 340 and screwed into the nut portion 163, so that the closing plate 340 has two vacuum heat insulating materials 351 and 352, The compressor storage chamber 310 can be fixed at the upper position and the front position. Thereby, the upper part and the front part of the compressor storage chamber 310 are covered with the two vacuum heat insulating materials 351 and 352, whereby the heat of the compressor 304 generated during operation can be insulated.

  When assembling the refrigerator, the work of attaching the vacuum heat insulating materials 351 and 352 is facilitated. Further, when the vacuum heat insulating materials 351 and 352 change over time or when the predetermined time for replacing the vacuum heat insulating materials 351 and 352 is reached, the vacuum heat insulating materials 351 and 352 are removed and replaced with new vacuum heat insulating materials 351 and 352. Work becomes easy.

  FIG. 31 shows yet another embodiment of the present invention. In the refrigerator 1E shown in FIG. 31, the same parts as those in the refrigerator 1D shown in FIG.

  The refrigerator 1C shown in FIG. 31 is different from the refrigerator 1D shown in FIG. 30 in the shape of one bag-like recess 191 and the shape of one vacuum heat insulating material 181 accommodated in the bag-like recess 191. .

  The bag-shaped recess 191 has an upper portion 192 and a front portion 193 in accordance with the shape of the compressor storage chamber 310, and has a substantially L-shape. The upper portion 192 is parallel to the front-rear direction of the refrigerator 1C, but the front side portion 193 is inclined with respect to the up-down direction of the refrigerator.

  On the other hand, the vacuum heat insulating material 181 has an uneven shape, for example, an approximately L shape, and has an upper portion 182 and a front portion 183. The vacuum heat insulating material 181 is fitted and held in the bag-shaped recess 191, the upper part 182 is fitted and held in the upper part 192, and the front part 183 is fitted and held in the front part 193.

  As described above, the refrigerator 1C using the vacuum heat insulating material 181 for heat insulation accommodates the recess 191 formed in a size that can accommodate the vacuum heat insulating material 181 around the compressor storage chamber 310 and the recessed portion 191. And a blocking plate (similar to the blocking plate 340 shown in FIG. 29) for closing the uneven vacuum heat insulating material 181 in the recess 191.

  Thereby, the number of parts can be reduced by adopting the shape of one bag-like recess 191 and the shape of one vacuum heat insulating material 181. And the operation | work which attaches the vacuum heat insulating material 181 becomes easy when assembling a refrigerator. Further, when the vacuum heat insulating material 181 changes over time or when a predetermined replacement time of the vacuum heat insulating material 181 is reached, the work of removing the vacuum heat insulating material 181 and replacing it with a new vacuum heat insulating material 181 becomes easy.

  In the refrigerator of each embodiment of the present invention described above, the vacuum heat insulating material can be easily replaced. For this reason, when the vacuum heat insulating material is damaged, for example, the surface of the vacuum heat insulating material is damaged due to handling during manufacture of the refrigerator, the vacuum heat insulating material can be easily replaced. For this reason, productivity of a refrigerator can be improved. Moreover, even when the vacuum heat insulating material deteriorates with time during use of the refrigerator, the vacuum heat insulating material can be easily replaced. Thereby, the cooling performance of the refrigerator can be maintained, recovered and improved, and the lifetime of the refrigerator can be extended. Further, since the closing plate covers the vacuum heat insulating material and the closing plate is fixed by the fastening parts, it is possible to prevent the application of a direct impact from the outside to the vacuum heat insulating material.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1, 10, 111 Refrigerator 3 Housing 3a Right side wall part 3b Left side wall part 5 Refrigeration room 7 Ice making room 9 Upper freezing room 11 Freezing room 13 Outer plate 15 Vacuum heat insulating material 17 Inner panel 19 Fixing screw 21 Gap 23 Fixing hook 25 Recessed portion 27 Vacuum heat insulating material 29 Outer wall panel 31 Outer plate 33 Fixing screw 41 Bottom plate 43 Vacuum heat insulating material 45 Closure plate 47 Hook receiving portion 49 Screw 51 High-temperature stored item 53 Refrigerating room stored item 101 Closed plate 102 Vacuum heat insulating material 103 Recessed portion 105 Fixing screw (fastening part)
110 Back surface portion 111 Closure plate 118 Reinforced uneven portion 121 Closure plate 125 Recessed portion 132 of the closure plate Vacuum heat insulating material 140 Through hole 150 in the vacuum heat insulating material Vacuum heat insulating material core 151 Vacuum insulating material laminated film (covering) Material)
152 welded portion 109 concave portion 301 rear plate 304 compressor 306 vacuum heat insulating material 307 closing plate 310 compressor storage chamber 340 closing plate 351, 352 vacuum heat insulating material

Claims (11)

A refrigerator using a vacuum insulation material for insulation,
A recess formed in a size capable of accommodating the vacuum heat insulating material on the surface of the portion using the vacuum heat insulating material;
A closing plate for closing the vacuum heat insulating material accommodated in the recess in the recess ,
The refrigerator is characterized in that at least one of the concave portions is provided below a partition wall portion provided in a refrigerator compartment of the refrigerator, and the closing plate closes the concave portion from the lower side .   The refrigerator according to claim 1, wherein the closing plate is fixedly attached to the surface by screws or hooks. At least one of the recess, the side wall portion of the refrigerator inner, rear wall of the refrigerator inside a refrigerator according to claim 1 or 2, wherein the side wall portion of the refrigerator outside, Oh Rui characterized in that it is a door of the refrigerator or freezer .   2. The refrigerator according to claim 1, wherein the concave portion in which the plate-like vacuum heat insulating material is accommodated is formed in a back surface portion of the refrigerator, and the closing plate is fixed by a fastening part.   The rear portion of the refrigerator is formed with the concave portion in which the plate-shaped vacuum heat insulating material is accommodated, and the closing plate is provided with an uneven portion for reinforcement, and the closing plate is fixed by a fastening part. The refrigerator according to claim 1.   The refrigerator according to claim 4 or 5, wherein the closing plate is provided with a concave portion for fixing a fastening part. The vacuum heat insulating material includes a core material and a covering material that covers the core material, and the vacuum heat insulating material is formed with a through hole that accommodates a convex portion inside the concave portion of the blocking plate. And
An inner wall portion of the through-hole of the vacuum heat insulating material is covered with a welded portion formed by welding the covering material, and the fastening component is connected to the concave shape portion of the closing plate and the vacuum heat insulating material. The refrigerator according to claim 6, wherein the blocking plate fixes the vacuum heat insulating material to the back surface side by passing through the through hole.   2. The refrigerator according to claim 1, wherein the vacuum heat insulating material for insulating the compressor storage chamber of the refrigerator is disposed, and the vacuum heat insulating material is closed by the closing plate.   The concave portion for accommodating the plate-like vacuum heat insulating material is formed in the upper portion of the compressor storage chamber, the concave portion is in a bag shape, and the closing plate is disposed in the opening of the concave portion. The refrigerator according to claim 8.   The upper part of the compressor storage chamber is provided with the concave part that accommodates the bent heat insulating material, and the closing plate is disposed in the opening part of the concave part. The refrigerator according to claim 8.   The refrigerator according to any one of claims 8 to 10, wherein the closing plate is disposed in an opening of the recess into which the vacuum heat insulating material is fitted, and the closing plate is fixed by a fastening part.

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