JP2021042941A - Refrigerator and manufacturing method of the same - Google Patents

Abstract

To provide a refrigerator which enables reduction of the number of components of a heat insulation door and can inhibit occurrence of dew condensation on the door, and to provide a manufacturing method of the refrigerator.SOLUTION: A refrigerator 10 includes: a refrigerator body 11 formed with a storage room; and a heat insulation door which closes the storage room. Further, a door 21, the heat insulation door, has: an outer plate part 29 formed of a metal plate; an inner plate part 30 which is disposed so as to face the outer plate part 29; and an internal space 33 formed between the outer plate part 29 and the inner plate part 30; a heat insulation material 34 disposed in the internal space 33; an upper lid member part 35 which closes the internal space 33 from above; and a lower lid member part which closes the internal space 33 from below. The lower lid member part is formed by a metal plate continuous with the outer plate part 29.SELECTED DRAWING: Figure 2

Description

The present invention relates to a refrigerator and a method for manufacturing the same, and more particularly to a refrigerator having a heat insulating door whose outer surface is made of a metal plate and a method for manufacturing the same.

In a general refrigerator, storage chambers such as a refrigerator compartment, a freezing chamber, and a vegetable compartment are formed inside the refrigerator body having heat insulation properties, and these storage rooms are closed from the front by a door having heat insulation properties. ..

Patent Document 1 describes a door provided in this type of refrigerator. FIG. 15 shows a door 100 provided in this type of refrigerator. In this figure, the members constituting the door 100 are shown separately. The door 100 includes an inner plate 101, an outer plate 102, and a resin panel 103 from the rear. Further, the upper cap 108 and the lower cap 109 are fitted into the upper end portion and the lower end portion of the outer plate 102.

Japanese Unexamined Patent Publication No. 2004-278891

However, the door 100 having the above configuration has room for improvement from the viewpoint of convenience during refrigerator operation. Specifically, the outer plate 102 of the door 100 is made of a steel plate such as stainless steel, while the lower cap 109 is made of synthetic resin. Therefore, under the operating conditions of the refrigerator, the temperature of the outer plate 102 made of metal is affected by the outside air, while the temperature of the lower cap 109 is not so high. For this reason, when the external atmosphere of the refrigerator is humid, dew condensation occurs on the surface of the lower cap 109, which becomes cold.

In order to prevent such dew condensation and to promote heat conduction, an aluminum tape may be attached to the inside of the lower cap 109 and the outer plate 102. However, in this way, the number of parts increases, and the man-hours in the manufacturing process increase, so that the manufacturing cost increases. Further, the provision of the lower cap 109 itself causes an increase in assembly man-hours and members.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerator and a method for manufacturing the same, which can reduce the number of parts of a heat insulating door and suppress the occurrence of dew condensation on the door. To provide.

The refrigerator of the present invention includes a heat insulating box body in which a storage chamber is formed and a heat insulating door that closes the storage chamber, and the heat insulating door faces an outer plate material portion made of a metal plate and the outer plate material portion. The inner plate material portion arranged above the surface, the internal space formed between the outer plate material portion and the inner plate material portion, the heat insulating material arranged in the internal space, and the upper lid material that closes the internal space from above. It is characterized by having a portion and a lower lid material portion that closes the internal space from below, and the lower lid material portion is formed continuously with the outer plate material portion.

Further, the refrigerator of the present invention further includes a fixing member for fixing the outer plate material portion and the lower lid material portion to each other, and the fixing member is arranged at the lower corner portion of the outer plate material portion. It is a feature.

The present invention includes an outer plate material portion, an inner plate material portion arranged facing the outer plate material portion, a side plate material portion connecting the outer plate material portion and the inner plate material portion, and the outer plate material portion and the inner plate material portion. An internal space formed between the portions, a heat insulating material arranged in the internal space, an upper lid material portion that closes the internal space from above, and a lower lid material portion that closes the internal space from below. A method for manufacturing a refrigerator having a heat insulating door made of a metal plate having a metal plate, wherein the metal plate having the outer plate material portion, the side plate material portion, and the lower lid material portion is prepared, and the outer plate material portion On the other hand, a step of bending the side surface plate material portion and the lower lid material portion at a substantially right angle, and a step of fixing the lower lid material portion and the side surface plate material portion at the corner portion of the outer plate material portion. A step of arranging the outer plate material portion facing the inner plate material portion, forming the inner space between the inner plate material portion and the outer plate material portion, and arranging the heat insulating material in the inner space. It is characterized by having.

The refrigerator of the present invention includes a heat insulating box body in which a storage chamber is formed and a heat insulating door that closes the storage chamber, and the heat insulating door faces an outer plate material portion made of a metal plate and the outer plate material portion. The inner plate material portion arranged above the surface, the internal space formed between the outer plate material portion and the inner plate material portion, the heat insulating material arranged in the internal space, and the upper lid material that closes the internal space from above. It is characterized by having a portion and a lower lid material portion that closes the internal space from below, and the lower lid material portion is formed continuously with the outer plate material portion. As a result, according to the refrigerator of the present invention, the number of parts constituting the heat insulating door can be reduced and the cost can be reduced by eliminating the need for the lower cap required in the background technology. Further, according to the refrigerator of the present invention, the lower lid material portion of the heat insulating door is composed of a metal plate continuous with the outer plate material portion, so that the heat from the outside air is lowered from the outer plate material portion during the operation of the refrigerator. Conducts to the lid material. Therefore, even if the external atmosphere of the refrigerator is humid, heat is conducted from the outer plate material portion, so that the temperature of the lower lid material portion is appropriately raised and water droplets are generated on the surface of the lower lid material portion. Is suppressed.

Further, the refrigerator of the present invention further includes a fixing member for fixing the outer plate material portion and the lower lid material portion to each other, and the fixing member is arranged at the lower corner portion of the outer plate material portion. It is a feature. As a result, according to the refrigerator of the present invention, the fixing member is arranged at the lower corner portion of the outer plate material portion, so that the metal member is prevented from being arranged at the corner portion of the heat insulating door, and the refrigerator can be used. It can improve the safety when used.

The present invention includes an outer plate material portion, an inner plate material portion arranged facing the outer plate material portion, a side plate material portion connecting the outer plate material portion and the inner plate material portion, and the outer plate material portion and the inner plate material portion. An internal space formed between the portions, a heat insulating material arranged in the internal space, an upper lid material portion that closes the internal space from above, and a lower lid material portion that closes the internal space from below. A method for manufacturing a refrigerator having a heat insulating door made of a metal plate having a metal plate, wherein the metal plate having the outer plate material portion, the side plate material portion, and the lower lid material portion is prepared, and the outer plate material portion On the other hand, a step of bending the side surface plate material portion and the lower lid material portion at a substantially right angle, and a step of fixing the lower lid material portion and the side surface plate material portion at the corner portion of the outer plate material portion. A step of arranging the outer plate material portion facing the inner plate material portion, forming the inner space between the inner plate material portion and the outer plate material portion, and arranging the heat insulating material in the inner space. It is characterized by having. As a result, according to the method for manufacturing a refrigerator of the present invention, since the lower lid material portion of the heat insulating door is composed of a metal plate continuous with the outer plate material portion, it is necessary to separately prepare a member to be the lower lid material portion. There is no. Therefore, the constant number of parts constituting the heat insulating door can be reduced, and the manufacturing cost of the refrigerator can be reduced.

It is a figure which shows the refrigerator which concerns on embodiment of this invention, (A) is a perspective view, (B) is a side sectional view. It is an exploded perspective view which shows the door of the refrigerator which concerns on embodiment of this invention. It is a figure which shows the door of the refrigerator which concerns on other form of this invention, (A) is the exploded perspective view, (B) is the perspective view which shows the fixing member. It is a figure which shows the manufacturing method of the refrigerator which concerns on embodiment of this invention, (A) is the plan view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is the metal. It is the figure which looked at the board from the side. It is a figure which shows the manufacturing method of the refrigerator which concerns on embodiment of this invention, (A) is a plan view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is the metal. It is the figure which looked at the plate from the side, (D) is the cross-sectional view which shows the metal plate of the part where the beat was formed. It is a figure which shows the manufacturing method of the refrigerator which concerns on embodiment of this invention, (A) is the plan view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is the metal. It is the figure which looked at the board from the side. It is a figure which shows the manufacturing method of the refrigerator which concerns on embodiment of this invention, (A) is the plan view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is the metal. It is the figure which looked at the board from the side. It is a figure which shows the manufacturing method of the refrigerator which concerns on embodiment of this invention, (A) is the plan view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is the metal. It is the figure which looked at the board from the side. It is a figure which shows the manufacturing method of the refrigerator which concerns on embodiment of this invention, (A) is the plan view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is the metal. It is the figure which looked at the board from the side. It is a figure which shows the manufacturing method of the refrigerator which concerns on embodiment of this invention, (A) is the plan view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is the metal. It is the figure which looked at the board from the side. It is a figure which shows the manufacturing method of the refrigerator which concerns on other embodiment of this invention, (A) is a plan view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is It is the figure which looked at the metal plate from the side. It is a figure which shows the manufacturing method of the refrigerator which concerns on other embodiment of this invention, (A) is the plan view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is It is the view which looked at the metal plate from the side, (D) is the perspective view which shows the fixing member. It is a figure which shows the manufacturing method of the refrigerator which concerns on other embodiment of this invention, (A) is the top view which shows the metal plate, (B) is the figure which looked at the metal plate from below, (C) is It is a view which saw the metal plate from the side, (D) is the perspective view which shows the fixing member, (E) is the sectional view which shows the insertion convex part. It is a table which shows the effect which is produced by this invention. It is an exploded perspective view which shows the door of the refrigerator which concerns on background technology.

Hereinafter, the refrigerator 10 according to the embodiment of the present invention will be described in detail with reference to the drawings. In the following description, each direction of up, down, front, back, left and right is appropriately used, and the left and right indicate the left and right when the refrigerator 10 is viewed from the front. In the following description, in principle, the same code number will be used for the same member, and repeated description will be omitted.

FIG. 1 shows a schematic structure of a refrigerator 10 according to an embodiment of the present invention. FIG. 1 (A) is a perspective view showing the overall appearance of the refrigerator 10, and FIG. 1 (B) is a cross-sectional view of the refrigerator 10 as viewed from the side.

As shown in FIG. 1A, the refrigerator 10 includes a refrigerator main body 11 which is a heat insulating box body, and a storage chamber for storing food and the like is formed inside the refrigerator main body 11. As the storage chamber, a refrigerating chamber 15, an upper freezing chamber 17, a lower freezing chamber 18, and a vegetable compartment 19 are formed from the upper stage. Here, since the upper freezing chamber 17 and the lower freezing chamber 18 are both storage chambers in the freezing temperature range, they may be collectively referred to as the freezing chamber 16.

The front surface of the refrigerator body 11 is open, and the front opening of each storage chamber is closed by a heat insulating door. Specifically, from the upper stage, the opening of the refrigerator compartment 15 is closed by the door 20, the opening of the upper freezing chamber 17 is closed by the door 21, the opening of the lower freezing chamber 18 is closed by the door 22, and the opening of the vegetable compartment 19 is closed. The opening is closed by the door 23.

The door 20 closes the opening of the refrigerator compartment 15 from the front, and for example, the upper and lower ends of the right end are rotatably supported by the refrigerator body 11. On the other hand, the doors 21, 22, and 23 are arranged so as to be retractable in the front-rear direction with respect to the refrigerator main body 11. Further, in the door 21, the door 22, and the door 23, a handle portion for pulling out is formed in the upper cap.

With reference to FIG. 1B, the refrigerator main body 11 which is the main body of the refrigerator 10 is arranged with a steel plate outer box 12 having an open front surface and a gap in the outer box 12, and the front surface thereof is formed. It is composed of an inner box 13 made of synthetic resin that opens. A heat insulating material 14 made of polyurethane foam is filled and foamed in the gap between the outer box 12 and the inner box 13. The door 20 and the like described above also adopt the same heat insulating structure as the refrigerator main body 11.

The refrigerating chamber 15 and the freezing chamber 16 located below the refrigerating chamber 15 are partitioned by a heat insulating partition wall 24. A heat insulating partition wall 25 is also formed between the freezing chamber 16 and the vegetable compartment 19 below the freezing chamber 16. The heat insulating partition walls 24 and 25 also have a heat insulating structure like the refrigerator body 11 described above.

A cooling chamber is formed behind the freezing chamber 16, and a cooler 28, which is an evaporator for cooling the air circulating in the refrigerator, is arranged inside the cooling chamber.

The cooler 28 is connected to a compressor 27, a radiator (not shown), and an expansion valve which is a capillary tube (not shown) via a refrigerant pipe, and constitutes a vapor compression refrigeration cycle circuit.

The cold air cooled by the cooler 28 circulates in the refrigerating chamber 15, the freezing chamber 16, and the vegetable compartment 19, so that the indoor temperatures of the refrigerating chamber 15 and the vegetable compartment 19 are maintained in the refrigerating temperature range, and the indoor temperature of the freezing chamber 16 is maintained. The temperature is kept in the freezing temperature range.

Further, the refrigerator 10 is provided with a control device (not shown), which executes a predetermined arithmetic process based on the input value from the sensors and controls each component device such as the compressor 27.

With reference to FIG. 2, the configuration of the door 20 provided in the refrigerator 10 described above will be described in detail. Here, each member constituting the door 20 is shown separately in the front-rear direction.

The door 20 mainly has an outer plate material portion 29 that serves as a design surface, an inner plate material portion 30 that closes the outer plate material portion 29 from behind, and a gasket 37 that is attached to the inner side surface of the inner plate material portion 30 in a frame shape. ing.

The inner plate material portion 30 is made of a synthetic resin material vacuum-formed in a plate shape, and closes the outer plate material portion 29 from the rear. An internal space 33 is formed between the outer plate material portion 29 and the inner plate material portion 30, and the inner space 33 is filled with the heat insulating material 34. As the heat insulating material 34, a foamed resin such as urethane resin or VIP (Vacuum Insulation Panel) can be adopted.

An upper lid material portion 35 made of synthetic resin is fitted in the upper end of the internal space 33. On the other hand, the lower end of the internal space 33 is covered with a lower lid material portion 36 made of a metal plate continuous with the outer plate material portion 29. In other words, the front surface, the left and right side surfaces, and the lower surface of the door 20 are formed by bending a single metal plate.

As will be described later, in the present embodiment, the lower lid material portion 36 is formed continuously with the outer plate material portion 29 to reduce the number of parts constituting the door 20, and further, when the refrigerator 10 is operated. It prevents dew condensation from occurring on the lower lid material portion 36. Further, such a configuration of the door 20 can be applied to the door 21, the door 22, and the door 23 shown in FIG. 1 (B).

The configuration of the door 20 according to another form will be described with reference to FIG. FIG. 3A is a perspective view showing the door 20, and FIG. 3B is a perspective view showing the fixing member 38.

The basic configuration of the door 20 shown in FIG. 3A is the same as that shown in FIG. 2, and here, the fixing member 38 is arranged at the lower corner portion of the door 20. The fixing member 38 is made of synthetic resin, and is a portion for fixing each portion constituting the outer plate material portion 29 and protecting the corner portion of the door 20 from a sharp portion made of a steel plate so as not to be exposed.

The configuration of the fixing member 38 will be described with reference to FIG. 3 (B). The fixing member 38 is made of an integrally injection-molded synthetic resin, and has a first surface portion 381, a second surface portion 382, and a third surface portion 383. The first surface portion 381 and the second surface portion 382 are plate-shaped members having a substantially rectangular shape, and the third surface portion 383 is a plate-shaped member having a substantially triangular shape. The first surface portion 381, the second surface portion 382, and the third surface portion 383 are arranged so as to be orthogonal to each other. When the fixing member 38 is assembled to the door 20, the first surface portion 381 of the fixing member 38 abuts on the left and right side surfaces of the outer plate material portion 29, the second surface portion 382 abuts on the lower surface of the outer plate material portion 29, and the third surface portion 383 abuts. It comes into contact with the rear surface of the outer plate material portion 29. Further, each side side and the corner portion of the fixing member 38 may be formed into a rounded corner shape in order to improve safety when the refrigerator 10 is used.

Further, the insertion convex portion 401 protrudes to the right from the first surface portion 381, the insertion convex portion 402 protrudes upward from the second surface portion 382, and the insertion convex portion 403 and the insertion protrude forward from the third surface portion 383. The convex portion 404 is formed. The insertion convex portion 401 to the insertion convex portion 404 protrudes in a cylindrical shape, and a return portion 42 is formed at the tip portion thereof as will be described later with reference to FIG. The insertion convex portion 401 is inserted into a hole formed on the side surface of the outer plate material portion 29, the insertion convex portion 402 is inserted into a hole formed at the bottom of the door 20, and the insertion convex portion 403 and the insertion convex portion 404 are outside. It is inserted into a hole formed on the rear surface of the plate material portion 29. By doing so, the relative position of each portion constituting the outer plate material portion 29 can be fixed. Further, the fixing member 38 can be firmly assembled to the outer plate material portion 29. Such matters will be described later with reference to FIG.

A method of manufacturing the door 20 shown in FIG. 2 will be described with reference to FIGS. 4 to 10.

With reference to FIG. 4, a metal plate 45 as a material for the outer plate material portion 29 described above is prepared. 4 (A) is a plan view showing the metal plate 45, FIG. 4 (B) is a view of the metal plate 45 shown in FIG. 4 (A) from below, and FIG. 4 (C) is a view of FIG. 4 (C). It is the figure which looked at the metal plate 45 shown in A) from the right.

With reference to FIGS. 4A to 4C, the metal plate 45 has a sufficient area to form the metal plate 45 of the door 20 shown in FIG. As the metal plate 45, for example, a stainless steel plate having a thickness of about 0.5 mm can be adopted. The metal plate 45 is manufactured by rolling, and the metal plate 45 is defined so that the rolling direction is parallel to the left-right direction. By doing so, as will be described later, the bending process by the operator's hand becomes easy.

With reference to FIG. 5, next, the metal plate 45 described above is subjected to cutting processing such as press processing to be formed into a predetermined shape. 5 (A) is a plan view showing a metal plate 45 cut into a predetermined shape, and FIG. 5 (B) is a view of the metal plate 45 shown in FIG. 5 (A) as viewed from below. C) is a view of the metal plate 45 shown in FIG. 5 (A) as viewed from the right. Further, FIG. 5D shows a cross section of the metal plate 45 at the portion where the beat 54, which will be described later, is formed.

With reference to FIG. 5A, the metal plate 45 is formed with an outer plate material portion 48 in the center. A side plate material portion 49 is connected to the outer side in the left-right direction of the outer plate material portion 48. A folded-back portion 52 is connected to the lateral side of the side plate material portion 49 in the left-right direction. The folded-back portion 52 is a portion where the end portion of the outer plate material portion 29 shown in FIG. 2 is folded back inward. The opening 47 is formed by opening the lower end portion of the folded portion 52 in a substantially rectangular shape. An insertion piece 46, which will be described later, is inserted into the opening 47.

The lower lid material portion 51 is connected to the lower side of the outer plate material portion 48. Further, folded portions 53 are formed on both left and right sides of the lower lid material portion 51 in the left-right direction. A folded-back portion 55 is formed below the lower lid material portion 51, and a rectangular insertion piece 46 extending downward from the left and right end portions of the folded-back portion 55 is formed.

Here, the boundary between the outer plate material portion 48 and the lower lid material portion 51, the boundary between the lower lid material portion 51 and the folded portion 53, and the boundary between the lower lid material portion 51 and the folded portion 55 are pressed. The beat 54 is formed. FIG. 5 (D) shows the cross-sectional shape of the beat 54. In FIG. 5 (A), the portion where the beat 54 is formed is shown by a alternate long and short dash line. Since the portion where the beat 54 is formed can be bent by an operator, the manufacturing cost of the door 20 can be reduced.

With reference to FIG. 6, the folded-back portion 53 and the folded-back portion 55 are then bent at right angles. 6 (A) is a plan view showing the metal plate 45, FIG. 6 (B) is a view of the metal plate 45 shown in FIG. 6 (A) from below, and FIG. 6 (C) is a view of FIG. 6 (C). It is the figure which looked at the metal plate 45 shown in A) from the right.

With reference to FIGS. 6 (A) to 6 (C), here, the folded-back portion 53 is bent at a substantially right angle toward the left, right, rear, and inside. As described above, since the beat 54 described above is formed at the boundary between the lower lid material portion 51 and the folded portion 53, this bending operation can be performed by an operator. Further, the folded-back portion 55 is bent at a substantially right angle with respect to the lower lid material portion 51. Here, too, since the beat 54 is formed at the boundary between the lower lid material portion 51 and the folded-back portion 55, the bending operation can be easily performed.

With reference to FIG. 7, the lower lid member portion 51 is then bent at a right angle. 7 (A) is a plan view showing the metal plate 45, FIG. 7 (B) is a view of the metal plate 45 shown in FIG. 7 (A) from below, and FIG. 7 (C) is a view of FIG. 7 (C). It is the figure which looked at the metal plate 45 shown in A) from the right.

With reference to FIGS. 7 (A) to 7 (C), here, the lower lid material portion 51 is bent so as to be substantially perpendicular to the outer plate material portion 48. By bending the lower lid material portion 51 in this way, the folded-back portion 55 and the insertion piece 46 face upward. Since the beat 54 described above is formed at the boundary between the lower lid material portion 51 and the outer plate material portion 48, the lower lid material portion 51 can be easily bent by the operator.

With reference to FIG. 8, the folded portion 52 is then bent at a right angle. 8 (A) is a plan view showing the metal plate 45, FIG. 8 (B) is a view of the metal plate 45 shown in FIG. 8 (A) from below, and FIG. 8 (C) is a view of FIG. 8 (C). It is the figure which looked at the metal plate 45 shown in A) from the right.

With reference to FIGS. 8A to 8C, the folded-back portions 52 arranged at both left and right ends are bent at right angles to the side plate material portion 49. The folding portion 52 is bent and bent using a press machine. By using a press machine for bending the folded-back portion 52, the bending process can be performed precisely, and the appearance of the manufactured door 20 can be improved.

With reference to FIG. 9, the side plate material portion 49 is then bent at a right angle. 9 (A) is a plan view showing the metal plate 45, FIG. 9 (B) is a view of the metal plate 45 shown in FIG. 9 (A) from below, and FIG. 9 (C) is a view of FIG. 9 (C). It is the figure which looked at the metal plate 45 shown in A) from the right.

With reference to FIGS. 9 (A) to 9 (C), the side plate material portion 49 is bent so as to be perpendicular to the outer plate material portion 48. Also in the bending process of the side plate material portion 49, by performing the push-bending process using the press machine in the same manner as described above, the side plate material portion 49 can be bent into the outer plate material portion 48 accurately and with a good appearance. ..

With reference to FIG. 10, the insertion piece 46 is then engaged with the opening 47. 10 (A) is a plan view showing the metal plate 45, FIG. 10 (B) is a view of the metal plate 45 shown in FIG. 10 (A) from below, and FIG. 10 (C) is a view of FIG. 10 (C). It is the figure which looked at the metal plate 45 shown in A) from the right.

With reference to FIG. 10A, as described above, the insertion piece 46, which is the end of the folding portion 55, is inserted into the opening 47 formed in the folding portion 52. Here, the insertion piece 46 of the portion protruding upward from the opening 47 is bent downward by approximately 180 degrees. As a result, the relative positions of the folded-back portion 52 and the folded-back portion 55 are fixed, and the angle of the side plate material portion 49 connected to the folded-back portion 52 with respect to the outer plate material portion 48 is fixed at a substantially right angle. Further, the angle of the lower lid material portion 51 connected to the folded-back portion 55 with respect to the outer plate material portion 48 is fixed at a substantially right angle.

By the above-mentioned steps, the outer plate material portion 29 and the lower lid material portion 36, which are a part of the door 20 shown in FIG. 2, are manufactured. After that, by assembling the inner plate material portion 30 to the rear side of the outer plate material portion 29, an internal space 33 is formed between the outer plate material portion 29 and the inner plate material portion 30. Further, the gasket 37 is arranged on the rear side of the inner plate material portion 30. Further, the internal space 33 is closed from above by the upper lid material portion 35, and the internal space 33 is filled with the heat insulating material 34. The door 20 is manufactured by such a process. The door 21, the door 22, and the door 23 shown in FIG. 1A can also be manufactured by the same manufacturing method as described above.

Further, referring to FIG. 1 (B), each component device constituting the freezing cycle such as a cooler 28 and a compressor 27 is arranged in the refrigerator main body 11, and the front opening of the refrigerating chamber 15 is closed by the door 20. The front opening of the upper freezing chamber 17 is closed by the door 21, the front opening of the lower freezing chamber 18 is closed by the door 22, and the front opening of the vegetable compartment 19 is closed by the door 23. The refrigerator 10 is manufactured by such a process.

Next, a method of manufacturing the door 20 shown in FIG. 3 will be described with reference to FIGS. 11 to 13. In the following description, the portion overlapping with the manufacturing method of the door 20 shown in FIG. 2 is omitted. Here, each portion constituting the metal plate 45 is fixed by the fixing member 38 shown in FIG. 12 (B).

With reference to FIG. 11, the shape of the metal plate 45 punched into a predetermined shape for manufacturing the door 20 will be described. 11 (A) is a plan view showing the metal plate 45, FIG. 11 (B) is a view of the metal plate 45 shown in FIG. 11 (A) from below, and FIG. 11 (C) is FIG. 11 (C). It is the figure which looked at the metal plate 45 shown in A) from the side.

With reference to FIG. 11A, in the metal plate 45, side plate material portions 49 and folded portions 52 are formed on both left and right sides of the outer plate material portion 48, and the lower lid material portion 51 and the lower lid material portion 51 are formed below the outer plate material portion 48. The folded-back portion 55 is formed. Further, the hole portion 411 is formed by opening the lower end portion of the side plate material portion 49, and the hole portion 413 is formed by opening the lower end portion of the folded-back portion 52. Further, the hole portion 412 is formed by opening the left and right ends of the lower lid material portion 51, and the hole portion 414 is formed by opening the left and right ends of the folded-back portion 55. The hole 411 to the hole 414 has a substantially circular opening, and the insertion convex portion 401 to the insertion convex portion 404 shown in FIG. 3B is inserted in a later step.

FIG. 12 shows the metal plate 45 after the bending process is completed. 12 (A) is a plan view showing the metal plate 45, FIG. 12 (B) is a view of the metal plate 45 shown in FIG. 12 (A) from below, and FIG. 12 (C) is a view of FIG. 12 (C). It is the figure which looked at the metal plate 45 shown in A) from the side. Further, FIG. 12D is a perspective view showing the fixing member 38.

With reference to FIGS. 12 (A) to 12 (C), the side plate material portion 49, the folded-back portion 52, the lower lid material portion 51, and the folded-back portion 55 are bent at a substantially right angle with respect to the outer plate material portion 48. There is. By performing such bending processing, the hole portion 411, the hole portion 412, the hole portion 413, and the hole portion 414 are arranged at the end portion of the metal plate 45. As shown in FIG. 12B, the hole portion 411 is formed in the side plate material portion 49 of the metal plate 45. As shown in FIG. 12C, the hole portion 412 is formed in the lower lid material portion 51 of the metal plate 45. As shown in FIG. 12A, the hole portion 413 and the hole portion 414 are formed in the folded-back portion 52 and the folded-back portion 55 forming the rear surface of the metal plate 45.

After the step of bending the metal plate 45 is completed as described above, the fixing members 38 shown in FIG. 12D are fitted into the lower left corner portion and the lower right corner portion of the metal plate 45, respectively. Specifically, the insertion convex portion 401, the insertion convex portion 402, the insertion convex portion 403 and the insertion convex portion 404 of the fixing member 38 are provided in the hole portion 411, the hole portion 412, the hole portion 413 and the hole portion 414 of the metal plate 45. insert. By doing so, the lower left corner portion and the lower right corner portion of the metal plate 45 are covered with the fixing member 38, so that the sharp end portions of the metal plate are exposed to the outside at the lower left corner portion and the lower right corner portion of the metal plate 45. It is possible to improve the safety at the time of use without having to do it. Further, by inserting and fixing the insertion convex portion 401 or the like of the fixing member 38 into the hole portion 413 or the like of the metal plate 45, the folded portion 52, the folded portion 55, the lower lid material portion 51 and the folded portion forming the metal plate 45 are folded back. The relative position of the portion 55 can be firmly fixed.

FIG. 13 shows a metal plate 45 into which the fixing member 38 is fitted. 13 (A) is a plan view showing the metal plate 45, FIG. 13 (B) is a view of the metal plate 45 shown in FIG. 13 (A) from below, and FIG. 13 (C) is a view of FIG. 13 (C). It is the figure which looked at the metal plate 45 shown in A) from the side. Further, FIG. 13 (D) is a perspective view showing the fixing member 38, and FIG. 13 (E) is a cross-sectional view showing the insertion convex portion 401.

As shown in FIGS. 13 (A) to 13 (C), fixing members 38 are arranged at the lower left end and the lower right end of the metal plate 45. By doing so, the lower left corner portion and the lower right corner portion of the metal plate 45 are covered with the fixing member 38, so that the sharp end portions of the metal plate are exposed to the outside at the lower left corner portion and the lower right corner portion of the metal plate 45. It is possible to improve the safety at the time of use without having to do it. Further, by inserting and fixing the insertion convex portion 401 or the like of the fixing member 38 into the hole portion 413 or the like of the metal plate 45, the folded portion 52, the folded portion 55, the lower lid material portion 51 and the folded portion forming the metal plate 45 are folded back. The relative position of the portion 55 can be firmly fixed.

With reference to FIG. 13D, an insertion convex portion 401 or an insertion convex portion 404 is formed on the inner surface of the fixing member 38. Further, as shown in FIG. 13 (E), the return portion 42 is formed by projecting the tip end portion of the insertion convex portion 401 upward. Since the return portion 42 is formed on the tip end side of the insertion convex portion 401, the insertion convex portion 401 is formed at the tip of the insertion convex portion 401 when the insertion convex portion 401 is inserted into the hole portion 411 shown in FIG. 12 (C). The insertion convex portion 402 can be engaged with the hole portion 411 from the inside to prevent the insertion convex portion 401 from coming off. Such a shape is the same for the other insertion convex portion 402 or the insertion convex portion 404.

The door 20 is manufactured by the above process. Further, referring to FIG. 1B, the refrigerator 10 is manufactured by disposing the door 20 in the refrigerator main body 11 together with other constituent devices.

The effects produced by this embodiment will be described with reference to the graph of FIG. Here, with reference to FIG. 1A, a temperature difference between a comparative example in which the lower surface of the door 21 is made of a resin cap and the present embodiment in which the lower surface of the door 21 is made of a metal plate is shown. Further, in the comparative example and the present embodiment, the temperature and humidity of the external atmosphere surrounding the refrigerator 10 are the same.

First, in the comparative example, the freezer compartment is cooled to -18.6 ° C., and the refrigerator compartment is cooled to 2.1 ° C. In this embodiment, the freezer compartment is cooled to -18.5 ° C. and the refrigerating chamber is cooled to 2.1 ° C.

Next, the temperature of the lower end of the door 21 is 27.9 ° C. in the comparative example in which the lower end of the door 21 is made of a resin cap, whereas the temperature of the lower end of the door 21 is 28 in this embodiment. It is 5.5 ° C. That is, the temperature of the lower end of the door 21 is 0.6 ° C. higher in this embodiment than in the comparative example. In the comparative example, the reason why the temperature of the lower end portion of the door 21 is low is that heat is not satisfactorily conducted to the synthetic resin member constituting the lower end portion of the door 21. On the other hand, in the present embodiment, since the lower end portion of the door 21 is made of a metal plate, the lower end portion of the door 21 is satisfactorily heated by heat conduction from the outside air. Therefore, even when the external atmosphere surrounding the refrigerator 10 is humid, it is possible to suppress the occurrence of dew condensation on the lower end portion of the door 21.

Next, the temperature of the lower end of the gasket 37 arranged on the door 21 shown in FIG. 2 will be described. The temperature of the lower part of the gasket 37 arranged on the door 21 is 28.6 ° C. in the present embodiment, while it is 27.8 ° C. in the comparative example. That is, the temperature of the lower part of the gasket 37 arranged on the door 21 is 0.8 ° C. higher in this embodiment than in the comparative example. This indicates that heat is satisfactorily conducted from the outer plate material portion 29 of the door 21 to the gasket 37.

Next, the temperature of the lower part of the door 21 shown in FIG. 2 will be described. The temperature of the lower part of the door 21 is 26.1 ° C. in the comparative example, whereas it is 27.2 ° C. in the present embodiment. That is, the temperature of the lower part of the door 21 is 1.1 ° C. higher in this embodiment than in the comparative example. This indicates that the heat is conducted to the lower surface of the outer plate material portion 29 of the door 21 so that the temperature is satisfactorily raised to the region below the door 21.

Next, the temperature of the upper end of the gasket 37 arranged on the door 22 shown in FIG. 1 will be described. The temperature of the upper end of the gasket 37 arranged on the door 22 is 28.5 ° C. in the comparative example, whereas it is 26.8 ° C. in the present embodiment. That is, the temperature of the upper end of the gasket 37 arranged on the door 22 is 1.3 ° C. higher in this embodiment than in the comparative example. This indicates that the heat is satisfactorily conducted to the lower surface of the outer plate material portion 29 of the door 21, and the upper end of the gasket 37 of the door 22 arranged immediately below the heat is also satisfactorily heated. ..

Generally, the upper end and the lower end of the gasket 37 are under conditions where dew condensation is likely to occur. However, by forming the lower end of the door 21 from a metal plate as in the present embodiment, the upper end and the lower end of the gasket 37 and the lower end are formed. It is possible to raise the temperature of the lower end portion and prevent the formation of dew condensation around the gasket 37.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. In addition, the above-mentioned forms can be combined with each other.

10 Lid 11 Refrigerator body 12 Outer box 13 Inner box 14 Insulation 15 Refrigerator room 16 Freezer room 17 Upper freezer room 18 Lower freezer room 19 Vegetable room 20 Door 21 Door 22 Door 23 Door 24 Insulation partition wall 25 Insulation partition wall 27 Compressor 28 Cooler 29 Outer plate part 30 Inner plate part 33 Internal space 34 Insulation material 35 Upper lid material part 36 Lower lid material part 37 Gasket 38 Fixing member 381 First surface part 382 Second surface part 383 Third surface part 401 Insertion convex part 402 Insertion Convex part 403 Insertion convex part 404 Insertion convex part 411 Hole part 412 Hole part 413 Hole part 414 Hole part 42 Return part 45 Metal plate 46 Insert piece 47 Opening part 48 Outer plate material part 49 Side plate material part 51 Lower lid material part 52 Folded part 53 Folded part 54 Beat 55 Folded part 100 Door 101 Inner plate 102 Outer plate 103 Resin panel 108 Upper cap 109 Lower cap

Claims (3)

It is provided with a heat insulating box body in which a storage room is formed and a heat insulating door that closes the storage room.
The heat insulating door includes an outer plate material portion made of a metal plate, an inner plate material portion arranged to face the outer plate material portion, and an internal space formed between the outer plate material portion and the inner plate material portion. It has a heat insulating material arranged in the internal space, an upper lid material portion that closes the internal space from above, and a lower lid material portion that closes the internal space from below.
A refrigerator in which the lower lid material portion is formed continuously with the outer plate material portion. Further, a fixing member for fixing the outer plate material portion and the lower lid material portion to each other is provided.
The refrigerator according to claim 1, wherein the fixing member is arranged at a lower corner portion of the outer plate material portion. Between the outer plate material portion, the inner plate material portion arranged facing the outer plate material portion, the side plate material portion connecting the outer plate material portion and the inner plate material portion, and the outer plate material portion and the inner plate material portion. From a metal plate having an internal space formed in, a heat insulating material arranged in the internal space, an upper lid material portion that closes the internal space from above, and a lower lid material portion that closes the internal space from below. It is a method of manufacturing a refrigerator equipped with a heat insulating door.
A step of preparing a metal plate having the outer plate material portion, the side plate material portion, and the lower lid material portion, and
A step of bending the side plate material portion and the lower lid material portion at a substantially right angle with respect to the outer plate material portion, and
A step of fixing the lower lid material portion and the side surface plate material portion at the corner portion of the outer plate material portion, and
A step of arranging the outer plate material portion facing the inner plate material portion, forming the internal space between the inner plate material portion and the outer plate material portion, and arranging the heat insulating material in the inner space. A method for manufacturing a refrigerator, which is characterized by being provided.

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