JP7217124B2 - Insulated doors, and refrigerators - Google Patents

Description

The present invention relates to insulating doors. The present invention also relates to a refrigerator provided with this insulating door.

In general, a refrigerator is provided with a heat insulating box so as to cover the outer circumference of the storage space in order to insulate it from the surroundings. In addition, the door of the refrigerator also has heat insulating properties.

A heat insulating layer is formed inside the door having such a heat insulating property. The heat insulating layer is made of foamed heat insulating material such as foamed polyurethane (also referred to as rigid urethane foam) in order to maintain heat insulating performance inside the refrigerator. That is, the heat insulating door is mainly composed of an outer plate (also referred to as a front side member) that constitutes the outer shape of the door, an inner plate (also referred to as a rear side member), and the above-described heat insulating layer existing between them. It is

When manufacturing a heat insulating door having such a structure, a foam heat insulating material is injected by an open injection method as disclosed in Patent Document 1, for example. In the open injection method, when injecting the foam insulation material (resin liquid) into the space formed by the lower surface plate (also called the front side member) and the outer peripheral frame, the upper surface plate (also called the back side member) is injected. It is a system in which the upper part is opened and the resin solution is injected into the open space. By adopting this open injection method, there is no need to provide an injection hole in the upper surface plate, and injection can be performed while moving the injection head. Therefore, the resin liquid can be evenly injected into the periphery of the space in a short period of time, making it possible to manufacture a heat insulating door having a homogeneous heat insulating layer.

JP-A-10-86160

By the way, a protective layer may be formed on the back surface of the lower surface plate, onto which the foam insulation material is dropped, for reasons of production. The compatibility between the protective layer and the foamed insulation material, the thickness of the protective layer formed on the surface, and the unevenness of the back surface of the lower surface plate affect the uniform spread of the dropped foamed insulation material. may not. If the dropped foamed heat insulating material does not spread uniformly on the back surface of the lower surface plate, uneven filling may occur when the heat insulating material foams and fills the inside of the door. If there is a corner portion of the lower surface plate, etc., where the foamed heat insulating material cannot be filled, a cavity is generated at that portion, which causes irregularities on the surface of the heat insulating door. This can reduce the appearance quality of the door.

Accordingly, one aspect of the present invention provides a heat-insulating door that has a heat-insulating layer that is more uniformly filled with a foam heat-insulating material, thereby suppressing deterioration in the appearance of the door.

The heat insulating door according to one aspect of the present invention includes a front side member, a back side member arranged to face the front side member, and a foam heat insulating material positioned between the front side member and the back side member. and a mesh sheet member arranged on the back surface of the front side member.

In the above-described heat insulating door according to one aspect of the present invention, the mesh sheet member may have non-adhesive properties with respect to the foam heat insulating material.

In the above-described heat insulating door according to one aspect of the present invention, the heat insulating layer may be formed by dripping foam heat insulating material from an injection head that moves along the longitudinal direction of the front side member. . In such a heat insulating door, the mesh sheet member may have a mesh shape in which the longitudinal direction of the front side member is shorter than the direction orthogonal to the longitudinal direction.

In the above-described heat insulating door according to one aspect of the present invention, the mesh sheet member includes a region including a dripping start position and the outside of the foam heat insulating material dripped from the injection head, and a dripping end position and its outside. It may be arranged at least in a region including the outside.

In the heat insulating door according to one aspect of the present invention, the mesh sheet member may have a mesh shape extending toward corners of the front side member.

Another aspect of the invention relates to a refrigerator with an insulated door. Here, the heat-insulating door is the heat-insulating door according to one aspect of the present invention described above.

In the heat insulating door according to one aspect of the present invention, the mesh sheet member is arranged on the back surface of the front side member. Thereby, when the heat insulating material is dripped onto the rear surface of the front side member, the heat insulating material can spread uniformly. Therefore, it is possible to obtain a heat insulating door having a heat insulating layer in which the heat insulating material is more uniformly filled and whose deterioration in quality of appearance is suppressed. In addition, the refrigerator according to one aspect of the present invention has a good appearance by including such a heat insulating door.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the external appearance of the refrigerator concerning one Embodiment of this invention. 2 is a cross-sectional view showing an internal configuration of a refrigerator compartment door provided in the refrigerator shown in FIG. 1; FIG. It is a mimetic diagram showing an outline of a manufacturing method of a refrigerator compartment door concerning one embodiment of the present invention. It is a schematic diagram which shows the back surface of the front member of the refrigerator concerning 1st Embodiment. It is a schematic diagram which shows the back surface of the front member of the refrigerator concerning 2nd Embodiment. FIG. 6 is a schematic diagram showing part of a mesh sheet arranged on the front member shown in FIG. 5; It is a schematic diagram which shows the back surface of the front member of the refrigerator concerning the modification of 2nd Embodiment. It is a schematic diagram which shows the back surface of the front member of the refrigerator concerning 3rd Embodiment. It is a schematic diagram which shows the back surface of the front member of the refrigerator concerning 4th Embodiment. It is a schematic diagram which shows the back surface of the front member of the refrigerator concerning 5th Embodiment.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the following description, the same parts are given the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[First embodiment]
(Overall configuration of refrigerator)
In this embodiment, a refrigerator 1 having two storage compartments (a refrigerator compartment 2 and a freezer compartment 3) will be described as an example. FIG. 1 shows the appearance of a refrigerator 1 according to this embodiment. FIG. 1 shows the appearance of the refrigerator 1 with each door opened. Refrigerator 1 mainly includes main body 10 , refrigerator compartment door 11 and freezer compartment door 12 . Refrigerator compartment door 11 and freezer compartment door 12 are heat insulating doors of an example of the present invention. The body portion 10 has an outer shape formed by a heat insulating box.

A refrigerating compartment 2 is arranged in the upper part of the refrigerator 1. - 特許庁A refrigerator compartment door 11 is attached to the front opening of the refrigerator compartment 2 . A freezer compartment 3 is arranged in the lower part of the refrigerator 1 . A freezer compartment door 12 is attached to the front opening of the freezer compartment 3 .

In addition, the configuration and arrangement of each storage compartment in the refrigerator 1 are not limited to those described above. The configuration and arrangement of each storage compartment can be appropriately changed according to the capacity of the refrigerator, the application, and the like.

In this embodiment, the surface on which the door is provided is the front surface (front surface) of the refrigerator 1 . Based on the position where the refrigerator 1 is installed in a normal state with the front surface as a reference, the surfaces of the body part 10 of the refrigerator 1 are defined as the top surface, the side surface, the back surface, and the bottom surface. In addition, when the refrigerator 1 is viewed from the front side, the upper side is called the upper side of the refrigerator 1 (or the refrigerator compartment door 11), and the lower side is called the refrigerator 1 (or the refrigerator compartment door 11). called the lower side. When the refrigerator 1 is viewed from the front side, the left side is called the left side of the refrigerator 1 (or the refrigerator compartment door 11), and the right side is called the right side of the refrigerator 1 (or the refrigerator compartment door 11). call.

(Structure of refrigerating compartment door)
Next, the internal configuration of the refrigerator compartment door 11 will be described with reference to the drawings. FIG. 2 shows a cross-sectional configuration of the refrigerator compartment door 11 .

The refrigerating compartment door 11 is mainly composed of a front member (front side member) 21, a door back (back side member) 22, a heat insulating layer 23, a mesh sheet (mesh sheet member) 24, and the like.

The front member 21 is positioned on the front side of the refrigerating compartment door 11 and constitutes the front of the body portion of the refrigerating compartment door 11 . The door back 22 is arranged to face the front member 21 and constitutes the rear side of the refrigerator compartment door 11 . By attaching the door back 22 to the rear surface of the front member 21, the outer shape of the body portion of the refrigerator compartment door 11 is formed. The heat insulating layer 23 is positioned between the front member 21 and the door back 22 .

The heat insulating layer 23 is made of foamed heat insulating material, for example. Foamed heat insulating materials include, for example, foamed polyurethane (also referred to as rigid urethane foam). The foam insulation material is formed by dropping a liquid insulation material 40 onto the rear surface of the front member 21 (see FIG. 3) and foaming the insulation material 40 in the space between the front member 21 and the door back 22. be done. Foamed polyurethane insulation materials include polyisocyanates, polyols, blowing agents, plasticizers, and the like.

Note that the heat insulating layer 23 may contain a vacuum heat insulating material. A vacuum insulation material is a sheet-shaped or plate-shaped insulation material. It is desirable to arrange the vacuum heat insulating material in a place where particularly high heat insulation is required in the refrigerator. By including the vacuum heat insulating material in the heat insulating layer 23, the heat insulating performance of the refrigerating compartment door 11 can be further enhanced.

A mesh sheet 24 is arranged between the front member 21 and the door back 22 . Specifically, the mesh sheet 24 is arranged on the back surface of the front member 21 . As will be described later, the mesh sheet 24 is arranged on the back surface of the front member 21 when the refrigerator compartment door 11 is manufactured. In this state, the heat insulating material is dripped onto the front member 21 . After that, the door back 22 is mounted on the front member 21, and a heat insulating layer 23 containing foam heat insulating material is formed in the space between the front member 21 and the door back 22 with the mesh sheet 24 arranged thereon. Thereby, the mesh sheet 24 is positioned between the front member 21 and the heat insulating layer 23 .

The freezer compartment door 12 also has an internal configuration similar to that of the refrigerator compartment door 11 .

(Manufacturing method of refrigerator compartment door)
Next, a method for manufacturing the refrigerator compartment door 11 will be described. The manufacturing method of the refrigerating compartment door 11 according to the present embodiment includes a dripping step of dripping the heat insulating material onto the front surface (back surface) of the front member 21, and an attaching step of mounting the door bag 22 on the front member 21 after dripping the heat insulating material. and a foaming step of foaming the heat insulating material in the space between the front member 21 and the door back 22 .

FIG. 3 shows how the dripping process is performed in the manufacturing method of the refrigerator compartment door 11 according to the present embodiment in the order of steps (1) to (4). FIG. 3 shows, as a comparative example, a conventional manufacturing method, in which the dropping process is performed without placing the net-like sheet 24 on the front member 21 .

A net-like sheet 24 is placed on the front member 21 before the dripping process. The front member 21 in this state is installed below the injection device 50 for the insulating material. The injection device 50 has an injection head 51 extending downward. The injection head 51 drops the heat insulating material 40 while moving in one direction (in the example shown in FIG. 3, while moving rightward as indicated by an arrow). The moving direction of the injection head 51 is preferably along the longitudinal direction of the front member 21 (in this embodiment, the vertical direction of the refrigerating compartment door 11). This makes it easier to ensure the uniformity of the heat insulating material 40 in the longer longitudinal direction.

In this embodiment, since the mesh sheet 24 is arranged on the front member 21 , the dropped heat insulating material 40 spreads vertically and horizontally along the mesh shape of the mesh sheet 24 . The mesh sheet 24 is placed on the back surface of the front member 21 and is arranged in a state in which it is not adhered to the back surface. It should be noted that the state in which the net sheet 24 is not adhered to the back surface means that most of the net sheet 24 is not adhered, and includes a state in which a part of the net sheet 24 is temporarily fixed on the back surface of the front member 21 . .

On the other hand, in the comparative example, since the mesh sheet 24 is not arranged on the front member 21, the heat insulating material 40 is less likely to spread.

When the injection head 51 reaches the drip end position (end point B), the injection device 50 finishes dripping the heat insulating material 40, and then the injection head 51 moves away from the front member 21 ((3) and (3) in FIG. 3). (4)).

In the mounting process after the dripping process, the door back 22 is mounted so as to cover the front member 21 . As a result, the outer shape of refrigerator compartment door 11 having a space inside is formed.

In the foaming process, the heat insulating material 40 reacts in the inner space of the refrigerator compartment door 11 to generate gas. As a result, a foamed heat insulating material (specifically, polyurethane foam) is formed in the internal space of the refrigerator compartment door 11 . Finally, the foam insulation is cured to obtain an insulation layer 23 having a rigid foam insulation.

As described above, in this embodiment, the heat insulation layer 23 is formed by injecting the heat insulation material 40 into the interior of the refrigerator compartment door 11 using the open injection method. Note that the injection device 50 for the heat insulating material shown in FIG. 3 is an example, and the injection device used in the method for manufacturing the refrigerating compartment door 11 according to the present embodiment is not limited to this.

In the present embodiment, the dripping process is performed with the mesh sheet 24 placed on the front member 21, so that the heat insulating material 40 flows more smoothly in the horizontal direction, and a wider area of the front member 21 is heat-insulated. Material 40 can be expanded.

On the other hand, even in the conventional example in which the mesh sheet 24 is not arranged, by controlling the moving position and speed of the injection head 51 and the dropping amount, In contrast, the heat insulating material 40 can be dripped uniformly to some extent. On the other hand, since dripping cannot be controlled by moving the injection head 51 in the lateral direction of the front member 21 perpendicular to the moving direction of the injection head 51, the heat insulating material 40 is less likely to spread. Therefore, the filling degree of the heat insulating material 40 is lower around the left and right end portions of the front member 21 than in the central portion, and the filling degree of the heat insulating material 40 may become non-uniform. When the foaming process is performed in such a state, a cavity is generated between the front member 21 and the front member 21 in a portion where the heat insulation material 40 is insufficiently filled, and the adhesiveness to the front member 21 becomes low, resulting in the refrigerating compartment door 11 becoming loose. Unevenness is generated on the front part, and the appearance of the refrigerator 1 is spoiled.

The rear surface of the front member 21 made of a metal plate member such as a steel plate may be coated with a coating agent as a protective layer against scratches and chemical changes. The compatibility of the coating agent with the heat insulating material and the influence of variations in the film thickness of the coating agent may make it more difficult for the heat insulating material dropped on the front member 21 to spread. For example, if a coating agent having high adhesion to the heat insulating material 40 is applied to the surface of the front member 21, the adhesive strength between the front member 21 and the heat insulating material (polyurethane foam material) increases, and the fluidity of the heat insulating material increases. may be more hindered.

Therefore, by arranging the mesh sheet 24 on the back surface of the front member 21 as in the present embodiment, direct contact between the surface of the front member 21 and the heat insulating material 40 is suppressed, and the fluidity of the heat insulating material 40 is reduced. and evenly spread the insulating material 40 over the front member 21 . The mesh sheet 24 preferably has non-adhesiveness to the heat insulating material 40 and the foam heat insulating material formed from the heat insulating material 40 . This allows the insulating material 40 to spread more uniformly over the front member 21 .

In addition, in the present embodiment, the mesh sheet 24 is positioned at the start position of the heat insulating material 40 dropped from the injection head 51 (position A in the plan view of (4) in FIG. 3), outside thereof, and at the end of dropping. It is arranged over the entire area including the position (position B in the plan view of (4) in FIG. 3) and its outside. As a result, the heat insulating material 40 can be spread more reliably even in the area outside the area from the start point A to the end point B of the drop of the heat insulating material 40 .

It should be noted that the mesh sheet 24 is preferably made of a resin material such as polypropylene (PP), polyethylene (PE), silicon-based resin, and fluorine-based resin. These resin materials have non-adhesiveness to polyurethane. Therefore, when the heat insulating layer 23 has polyurethane foam, the fluidity and extensibility of the heat insulating material 40 at the time of forming the heat insulating layer can be enhanced.

FIG. 4 shows a more specific configuration of the mesh sheet 24 arranged on the front member 21. As shown in FIG. In FIG. 4, arrows indicate the moving direction of the injection head 51 in the dropping step. In addition, FIG. 4 shows an enlarged mesh shape of the mesh sheet 24 .

As shown in FIG. 4, the mesh sheet 24 is formed of a plurality of fibrous bodies extending vertically and horizontally. The mesh sheet 24 has a grid-like mesh shape with rectangular openings. Here, the mesh shape of the mesh sheet 24 is a rectangular shape that is shorter in the moving direction of the injection head 51 than in the direction orthogonal to the moving direction. That is, in the rectangular opening of the mesh sheet 24, the length L1 of the injection head 51 in the moving direction is smaller than the length L2 in the direction perpendicular to the moving direction.

If the mesh length is long, that is, if the mesh is coarse, the liquid insulating material 40 will easily flow over the mesh. On the other hand, however, if the mesh is coarse, the liquid heat insulating material 40 tends to fall onto the surface of the front member 21 through the mesh. Conversely, if the length of the mesh is short, the liquid insulation material 40 is less likely to fall through the mesh, but the fluidity on the mesh is also reduced.

Therefore, in the present embodiment, the mesh shape of the mesh sheet 24 has the structure as described above, so that the dropped heat insulating material 40 is distributed in the longitudinal direction (the direction of the length L2) of the mesh (opening). flow to As a result, the heat insulating material 40 can be spread further in the direction perpendicular to the moving direction of the injection head 51 (that is, the lateral direction of the refrigerating compartment door 11). On the other hand, since the meshes (openings) can be made dense in the lateral direction (the direction of the length L1), the liquid heat insulating material 40 is prevented from falling through the meshes. Therefore, the liquid heat insulating material 40 can more reliably flow in the longitudinal direction of the mesh (the direction of the length L2).

In the mesh sheet 24 having such a mesh shape, the aperture ratio of the openings formed in the sheet is preferably 50% or more and 97% or less. As a result, the dripped heat insulating material 40 can pass through the upper surface of the mesh sheet 24 and flow to the outside of the dripping area, while part of it can be dropped onto the surface of the front member 21 through the opening. . Therefore, the heat insulating layer 23 made of the heat insulating material 40 can be uniformly formed between the mesh sheet 24 and the back surface of the front member 21, and the separation of the heat insulating material 40 and the back surface of the front member 21 is suppressed. be done.

Moreover, the wire diameter of the fibrous body forming the mesh sheet 24 is preferably 0.2 mm or more, more preferably 1.0 mm or more. By setting the wire diameter to 0.2 mm or more, the mesh sheet 24 can have a certain degree of rigidity and weight. Therefore, when the mesh sheet 24 is arranged on the front member 21, it is possible to prevent the mesh sheet 24 from being displaced. In addition, by setting the wire diameter to 1.0 mm or more, it is possible to secure a sufficient width for the liquid heat insulating material 40 to flow on the net, and the fluidity of the heat insulating material 40 on the net can be improved. improves.

When the wire diameter of the fibrous material forming the mesh sheet 24 is increased, the aperture ratio of the openings of the mesh sheet 24 tends to decrease. In the present embodiment, as described above, the density of the meshes (openings) in the longitudinal direction and the widthwise direction is changed. can be in any desired ratio as described above.

Note that two or more mesh sheets 24 may be stacked and arranged. At this time, by overlapping the mesh shape of each mesh sheet 24 slightly shifted, the contact area between the heat insulating material 40 immediately after dropping and the surface of the front member 21 can be further reduced (that is, the aperture ratio can be further reduced). can be done. Thereby, the fluidity of the heat insulating material 40 can be further improved.

(summary)
As described above, in the refrigerator 1 according to the present embodiment, the mesh sheet 24 is arranged on the back surface of the front member 21 forming the refrigerator compartment door 11 . Thereby, the fluidity of the heat insulating material 40 when the heat insulating material 40 is dripped onto the back surface of the front member 21 can be improved. Therefore, the heat insulating material 40 is filled more uniformly, and the heat insulating layer 23 with few voids can be formed. Having such a heat insulating layer 23 suppresses the formation of irregularities on the surface of the refrigerator compartment door 11, so that the appearance quality of the refrigerator 1 can be improved.

Further, even when the front member 21 is formed of a thinner steel plate, the formation of irregularities on the front surface of the refrigerator compartment door 11 is suppressed, so that the appearance of the refrigerator 1 when viewed from the front is improved. can be made

In the above-described embodiment, the refrigerating compartment door 11 having a vertically elongated rectangular shape was described as an example, but the above-described manufacturing method is also applied to a heat insulating door having a horizontally elongated rectangular shape. can do. In this case, it is preferable to move the injection head 51 of the injection device 50 along the lateral direction of the heat insulating door (longitudinal direction of the front member). The rectangular opening of the mesh sheet 24 is placed on the front member so that the length L1 of the injection head 51 in the moving direction is smaller than the length L2 in the direction orthogonal to the moving direction. It is preferable to place the

Moreover, the method for manufacturing the refrigerator compartment door 11 described above can also be used when manufacturing a heat insulating door other than the refrigerator compartment door 11 (for example, a heat insulating door such as a freezer or a warmer).

[Second embodiment]
Next, a second embodiment of the invention will be described. The second embodiment differs from the first embodiment in the structure of the mesh sheet arranged on the back surface of the front member. For other configurations, configurations similar to those of the first embodiment can be applied. Therefore, the points different from the first embodiment will be mainly described below.

FIG. 5 shows the structure of the mesh sheet 124 arranged on the front member 21 constituting the refrigerator compartment door 11 according to the second embodiment. In FIG. 5, arrows indicate the moving direction of the injection head 51 in the dropping step. In addition, FIG. 5 shows an enlarged mesh shape of the mesh sheet 124 .

As shown in FIG. 5, the mesh sheet 124 is formed of a plurality of fibrous bodies extending in a direction inclined with respect to the vertical direction of the front member 21 . The mesh sheet 124 has a grid-like mesh shape with rhombic openings. Here, the mesh shape of the mesh sheet 124 is a rhombic shape that is shorter in the moving direction of the injection head 51 than in the direction orthogonal to the moving direction. That is, in the rhombus-shaped opening of the mesh sheet 124, the length L1 of the injection head 51 in the moving direction is smaller than the length L2 in the direction perpendicular to the moving direction.

Since the mesh shape of the mesh sheet 124 has the structure described above, the dripped heat insulating material 40 is promoted to flow in the longitudinal direction (direction of the length L2) of the mesh (opening). . As a result, the heat insulating material 40 can be spread further in the direction perpendicular to the moving direction of the injection head 51 (that is, the lateral direction of the refrigerating compartment door 11).

FIG. 6 is a partially cut-out photograph of the mesh sheet 124 of an example. FIG. 6 shows a state in which the longitudinal direction of the rhombic meshes (openings) is arranged in the vertical direction. The net-like sheet shown in FIG. 6 has meshes formed of fibrous bodies made of polypropylene (PP) having a wire diameter of 0.22 mm. The opening ratio of the openings formed in the mesh sheet is 75%. After placing such a net-like sheet on the front member formed of a steel plate, the injection head is moved in the lateral direction of the mesh of the net-like sheet (L1 direction in FIG. 5, left and right direction in FIG. 6), and the liquid state is injected. of insulating material (polyurethane) was dropped. The insulating material was then foamed in the space between the front member and the door back. As a result, it was confirmed that even the corners of the front member were uniformly filled with the insulating material.

FIG. 7 shows a modification of the second embodiment. FIG. 7 shows the configuration of a mesh sheet 124A arranged on the front member 21 constituting the refrigerator compartment door 11 according to the modification. The mesh sheet 124A is formed of a plurality of obliquely extending fibrous bodies. The mesh sheet 124A has a grid-like mesh shape with square openings. According to such a mesh sheet 124A, since each fibrous body forming the mesh shape is directed toward each corner portion (corner portion) of the front member 21, the fibrous body extends in the extending direction. An insulating material 40 can be flowed along.

[Third embodiment]
Next, a third embodiment of the invention will be described. The third embodiment differs from the first embodiment in the structure of the mesh sheet arranged on the rear surface of the front member. For other configurations, configurations similar to those of the first embodiment can be applied. Therefore, the points different from the first embodiment will be mainly described below.

FIG. 8 shows the configuration of a mesh sheet 224 arranged on the front member 21 constituting the refrigerator compartment door 11 according to the third embodiment. In FIG. 8, arrows indicate the moving direction of the injection head 51 in the dropping step. In addition, FIG. 8 shows an enlarged mesh shape of the mesh sheet 224 .

As shown in FIG. 8, the mesh sheet 224 has a structure in which a plurality of elliptical openings are arranged vertically and horizontally. The mesh sheet 224 is obtained by forming a plurality of openings in a sheet member made of a resin material such as polypropylene (PP), polyethylene (PE), silicone resin, and fluorine resin. That is, the mesh sheet 224 has a mesh shape with elliptical openings. Here, the elliptical openings forming the mesh shape of the mesh sheet 224 are arranged so that the diameter L1 in the moving direction of the injection head 51 is shorter than the diameter L2 in the direction orthogonal to the moving direction.

Since the mesh shape of the mesh sheet 224 has the structure described above, the dripped heat insulating material 40 is promoted to flow in the longitudinal direction (direction of the length L2) of the mesh (opening). . As a result, the heat insulating material 40 can be spread further in the direction perpendicular to the moving direction of the injection head 51 (that is, the lateral direction of the refrigerating compartment door 11).

[Fourth Embodiment]
Next, a fourth embodiment of the invention will be described. The fourth embodiment differs from the first embodiment in the structure of the mesh sheet arranged on the rear surface of the front member. For other configurations, configurations similar to those of the first embodiment can be applied. Therefore, the points different from the first embodiment will be mainly described below.

In the fourth embodiment, an example in which the mesh sheet has a mesh shape extending toward the corners of the front member 21 will be described. FIG. 9 shows the configuration of mesh sheets 324a to 324d arranged on the front member 21 constituting the refrigerator compartment door 11 according to the fourth embodiment. In FIG. 9, arrows indicate the moving direction of the injection head 51 in the dropping step. In addition, FIG. 9 shows an enlarged mesh shape of mesh sheets 324a and 324b.

In the refrigerator compartment door 11 according to the present embodiment, four mesh sheets 324a, 324b, 324c, and 324d are arranged on the rear surface of the front member 21. As shown in FIG. Each of the mesh sheets 324a, 324b, 324c, and 324d has a structure in which a plurality of elliptical openings are arranged vertically and horizontally. These mesh sheets 324a, 324b, 324c, and 324d are sheet members made of a resin material such as polypropylene (PP), polyethylene (PE), silicone resin, and fluorine resin, and have a plurality of openings. Obtained by forming. Thus, each of the mesh sheets 324a, 324b, 324c, and 324d has a mesh shape with elliptical openings.

The mesh sheet 324a is arranged so as to cover the upper right area from the central portion of the front member 21. As shown in FIG. The mesh sheet 324b is arranged to cover the upper left area from the central portion of the front member 21 . The mesh sheet 324c is arranged so as to cover the area from the central portion of the front member 21 to the lower right. The mesh sheet 324d is arranged to cover the central portion of the front member 21 and the lower left area thereof.

As shown in FIG. 9, the mesh sheet 324a arranged in the upper right region of the front member 21 has a mesh shape extending toward the upper right corner portion of the front member 21. As shown in FIG. Further, the mesh sheet 324b arranged in the upper left area of the front member 21 has a mesh shape extending toward the upper left corner portion of the front member 21. As shown in FIG.

Similarly, the mesh sheet 324c arranged in the lower right area of the front member 21 has a mesh shape extending toward the lower right corner portion of the front member 21 . Further, the mesh sheet 324d arranged in the lower left area of the front member 21 has a mesh shape extending toward the lower left corner portion of the front member 21 .

The mesh shape of each of the mesh sheets 324a, 324b, 324c, and 324d has the structure described above, so that the dripped heat insulating material 40 is promoted to flow to the four corners of the front member 21. . As a result, the heat insulating material 40 can be more spread over the corners of the front member 21 .

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described. The fifth embodiment differs from the first embodiment in the structure of the mesh sheet arranged on the rear surface of the front member. For other configurations, configurations similar to those of the first embodiment can be applied. Therefore, the points different from the first embodiment will be mainly described below.

In the fifth embodiment, the mesh sheets are arranged in a region including the dripping start position and the outside of the heat insulating material 40 dripped from the injection head 51 and a region including the dripping end position and the outside thereof. An example will be described. FIG. 10 shows the configuration of mesh sheets 424a and 424b arranged on the front member 21 constituting the refrigerator compartment door 11 according to the fifth embodiment.

In FIG. 10, arrows indicate the moving direction of the injection head 51 in the dropping process. Also, in FIG. 10, A indicates the start position of the heat insulating material 40 dropped from the injection head 51, and B indicates the end position of the drop.

As shown in FIG. 10, in the refrigerator compartment door 11 according to the present embodiment, two mesh sheets 424a and 424b are arranged on the back surface of the front member 21. As shown in FIG. The mesh sheet 424 a is arranged above the front member 21 . The mesh sheet 424b is arranged below the front member 21 . The mesh shape of the mesh sheets 424a and 424b may be any of the mesh shapes described in the above first to fourth embodiments.

Specifically, the mesh sheet 424a is arranged in a region including the drop start position A of the heat insulating material 40 dropped from the injection head 51 and its upper side. In addition, the mesh sheet 424b is arranged in a region including the dropping end position B of the heat insulating material 40 dropped from the injection head 51 and its lower side.

By arranging the mesh sheet 424a on the front member 21 in the above-described region, the heat insulating material 40 dripped onto the front member 21 is distributed from the drip start position A along the arrangement position of the mesh sheet 424a. It is guided in the direction of expanding upward. In addition, since the mesh sheet 424b is arranged in the above-described region on the front member 21, the heat insulating material 40 dripped onto the front member 21 is distributed along the arrangement position of the mesh sheet 424a. It is induced in a direction extending downward from B. As a result, the heat insulating material 40 can be more reliably guided to the upper end portion side and the lower end portion side of the front member 21 where the heat insulating material 40 after dripping is difficult to spread.

In each of the above-described embodiments, the heat insulating door of a refrigerator is described as an example of the present invention. However, the invention is not so limited. INDUSTRIAL APPLICABILITY The heat-insulating door according to the present invention can be applied, for example, to doors of heat-insulating warehouses such as heat-retaining warehouses and freezers.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the meaning and range of equivalents of the scope of the claims. Also, configurations obtained by combining configurations of different embodiments described herein are also included in the scope of the present invention.

1: Refrigerator 11: Refrigerator door (insulating door)
12: Freezer compartment door (insulating door)
21: front member (front side member)
22: Door back (back side member)
23: Insulation layer (foam insulation)
24: Mesh sheet (mesh sheet member)
50: injection device (of heat insulating material) 51: injection head 124: mesh sheet (mesh sheet member)
124A: Mesh sheet (mesh sheet member)
224: Mesh sheet (mesh sheet member)
324a: Mesh sheet (mesh sheet member)
324b: Mesh sheet (mesh sheet member)
324c: Mesh sheet (mesh sheet member)
324d: Mesh sheet (mesh sheet member)
424a: Mesh sheet (mesh sheet member)
424b: Mesh sheet (mesh sheet member)

Claims (5)

a front side member;
a back-side member arranged to face the front-side member;
a heat insulating layer positioned between the front side member and the back side member and having a foamed heat insulating material;
A mesh sheet member arranged on the back surface of the front side member ,
The heat insulating layer is formed by dripping a foam heat insulating material from an injection head that moves along the longitudinal direction of the front side member,
The mesh sheet member has a mesh shape in which the longitudinal direction of the front side member is shorter than the direction orthogonal to the longitudinal direction . a front side member;
a back-side member arranged to face the front-side member;
a heat insulating layer positioned between the front side member and the back side member and having a foamed heat insulating material;
a mesh sheet member arranged on the back surface of the front side member;
with
The mesh sheet member has a mesh shape extending toward the corners of the front side member. 3. The mesh sheet member is arranged at least in a region including a dripping start position and the outside of the foam insulation material dripped from the injection head, and in a region including the dripping end position and the outside thereof. 2. The heat insulating door according to 1 . The mesh sheet member has non-adhesiveness to the foam insulation material,
The heat insulating door according to any one of claims 1 to 3 . A refrigerator comprising the heat insulating door according to any one of claims 1 to 4.

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