JP2005055086A - Refrigerator, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator raising heat insulation capacity without an adverse affect of deteriorating condensation capacity of a radiating pipe, capable of maintaining heat insulation of a vacuum insulation material by interposing urethane foam between the radiating pipe and the vacuum insulation material, and capable of suppressing even aged deterioration of the vacuum insulation material with respect to a refrigerator provided with vacuum insulation material, and a manufacturing method capable of securing quality of the refrigerator. <P>SOLUTION: The hard urethane foam and the vacuum insulation material are provided between an outer casing and an inner casing, the vacuum insulation material is embedded in a state not contacting the outer casing and the inner casing, the vacuum insulation material is installed in an intermediate position between the radiating pipe and the inner casing, and an arrangement positional relationship between the vacuum insulation material, and the inner and outer casings is defined in response to change of viscosity at urethane foaming. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to the technology of a refrigerator equipped with a vacuum heat insulating material.

  In recent years, the need for energy saving has increased in the refrigerator, and the need for space saving has also increased. Therefore, as a means for realizing these needs, products using a vacuum heat insulating material that has a much better heat insulating performance than rigid urethane foam have come out.

  Conventional refrigerators equipped with a vacuum insulation material have vacuum insulation materials directly attached to the outer box with an adhesive. In this method, the attachment workability is good in the refrigerator manufacturing process because the pasting place is flat. Moreover, it becomes possible to mount the vacuum heat insulating material 3 of a large area, without interfering with the unevenness | corrugation of an inner box. However, in this mounting method, since the vacuum heat insulating material is attached to the outer box, the space for attaching the heat radiating pipe is reduced, and the heat leakage is improved.

  In addition, as a conventional technology, vacuum heat insulating material is arranged on both sides, top surface, back surface, bottom surface and front surface, and the vacuum insulating material coverage exceeds 50% and less than 80% with respect to the surface area of the outer box to save energy In order to increase the effect and to embed vacuum insulation in high-quality urethane foam between the outer box and the inner box on the surface where the outer box surface temperature becomes higher than the outside temperature, to suppress the deterioration of the vacuum insulation over time. What to do has been proposed. (See Patent Document 1)

Japanese Patent Laid-Open No. 2003-14368 (FIG. 3 and others)

  Compared to when used at low temperatures, vacuum insulation has the property of reducing heat insulation when used at high temperatures. In addition, the heat insulation capacity may be significantly reduced. In addition, since the vacuum heat insulating material is weak in humidity, the deterioration is remarkably accelerated in high humidity, and when it is installed in a place where it is exposed to the outside air, the heat insulating ability may be significantly lowered before the life of the refrigerator.

  Furthermore, in the conventional refrigerator structure, a vacuum heat insulating material is embedded in the middle of the outer box and the inner box with a spacer, and the thickness of the refrigerator is filled with urethane foam from the front end surface of the outer box. When the foam is installed with the side facing upward, the viscosity of the urethane foam increases as the distance of the vacuum insulation increases from the front end face of the outer box, and the urethane foam rises between the vacuum insulation and the outer or inner box. There is a high possibility that defects will occur. Moreover, when the spacer which installs a vacuum heat insulating material becomes large, it will become the cause of obstruction | occlusion of urethane flow at the time of urethane foam foaming, and will cause the urethane foam defect. On the other hand, if the spacer is made small, the strength to withstand the foaming pressure cannot be obtained, and the number of spacers needs to be increased. This increases the number of assembling steps, leading to an increase in product cost.

  The present invention has been made to solve the above-described problems, and provides a technique for improving the heat insulation capacity without deteriorating the condensation capacity of the heat radiating pipe for a refrigerator equipped with a vacuum heat insulating material. Objective. In addition, the present invention is a practical refrigerator in which urethane foam is interposed between the heat radiating pipe and the vacuum heat insulating material, the heat insulating ability of the vacuum heat insulating material can be maintained, and the aging deterioration of the vacuum heat insulating material can be suppressed. And it aims at providing the manufacturing method which can ensure the quality.

  The refrigerator of the present invention includes a vacuum heat insulating material that is supported by the outer box or the inner box between the outer box and the inner box and is disposed at an intermediate position between the inner box and the heat radiating pipe provided inside the outer box, and a vacuum heat insulating material. And urethane foam that is injected and foamed so as to be embedded without contacting the inner box and the heat radiating pipe.

  The refrigerator of the present invention is disposed between the outer box and the inner box, and is supported by being fixed to the outer box or the inner box with a spacer in a state where it is not in contact with the outer box and the inner box, and the vacuum insulating material is covered. The outer box and the urethane foam to be injected and foamed between the inner box and the spacer are provided with a flow path through which the air and urethane foam can pass.

  The manufacturing method of the refrigerator of the present invention is arranged between the outer box and the inner box by placing a vacuum heat insulating material at an intermediate position between the inner box and the heat radiating pipe provided inside the outer box and supported by the spacer in the outer box or the inner box. A step of injecting urethane foam from the back side of the refrigerator so that the vacuum heat insulating material is not in contact with the inner box and the heat radiating pipe, and air and urethane foam during foaming of the urethane foam are flow paths of the spacer. And foaming so as to cover the vacuum heat insulating material by passing from the bottom through the top.

As described above, according to the present invention, a refrigerator with a heat insulation efficiency having a stable quality in a long-term use after ensuring performance by heat dissipation for a refrigerator having a structure in which foaming is performed using a vacuum heat insulating material as the heat insulating material, A manufacturing method is obtained.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are explanatory views of urethane foam foam. A refrigerator main body in which a metal refrigerator outer box 1 such as iron and a resin inner box 2 such as ABS are integrated is installed with the door side down. In the outer box 1, the side plate 12 forms a side portion, the rear plate 13 forms a back surface, and the bottom plate 15 forms a bottom surface. With this outer box facing up, the front surface of the refrigerator product, that is, the door side is facing downward, and the back surface of the refrigerator is the top surface, and the urethane foam stock solution is injected from the inlet 16 provided between the back surface and the side surface.

  When the injection of the urethane foam stock solution is completed, the foaming of the urethane foam starts, and the urethane foams while flowing from the direction of the arrow in FIG. 2, that is, from the lower portion where the stock solution is stored to the back side formed by the rear plate 13. At this time, the viscosity of the urethane foam is small because it is liquid on the door side at the start of foaming. However, as foaming progresses, that is, the foam changes to a solid while flowing upward, the viscosity increases toward the top. That is, when urethane foam is foamed, the viscosity of the urethane foam is lower as the refrigerator front end is lower and closer to the rear. In other words, when vacuum insulation is embedded in the side of the refrigerator between the inner box and the outer box, if it is mounted near the back, the viscosity of the urethane is high, which may cause urethane foam failure near the vacuum insulation Becomes higher. That is, the viscosity of the side surface portion is smaller than that of the front surface side, and that of the inner case is smaller on the back surface.

  3 is a front sectional view of the refrigerator, FIG. 4 is a sectional side view of the refrigerator, and FIG. 5 is a sectional top view of the refrigerator. 3, 4, and 5, 1 is an outer box made of a metal plate, 2 is an inner box made of synthetic resin, 3 is a vacuum heat insulating material, and 6 is for installing the vacuum heat insulating material at a certain distance from the outer box. The spacers 4 are urethane foam filled between the outer box and the inner box which are heat insulating materials. The vacuum heat insulating material 3 is secured to the outer box by the spacer 6 and then foamed by injecting a urethane foam raw material. In FIG. 3, the urethane foam raw material is injected from the back of the figure toward the front.

  FIG. 4 shows a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 shows a cross-sectional view taken along line BB. As the vacuum heat insulating material 3 which is a hatched portion, a material in which an inorganic aggregate such as glass wool is accommodated in a bag made of a plurality of metal layers or the like is used. The spacer 6 for fixing and supporting the vacuum heat insulating material 3 to the outer box 1 is made of a thin plate resin such as a U shape, a wave shape, or a hollow box shape, for example, ABS resin, and the metal of the outer box 1 or the vacuum heat insulating material 3 Between the outer surface and the nylon resin, for example, a rubber adhesive is adhered and fixed. The vacuum heat insulating material 3 is fixed with a spacer at an intermediate position between the side plate 12 forming the side portion of the refrigerator and the side plate of the inner box, and both sides thereof, that is, between the vacuum heat insulating material and the side plate 2 and between the inner box 2 and the vacuum. Urethane flows in the gap between the heat insulating material 3 as shown in the figure. The arrows in FIG. 4 indicate the foaming direction when the urethane foam raw material is injected from the rear plate 13 side when the urethane foam raw material is injected and foamed, and then foamed from the front end face side. The spacer 6 has a structure that does not obstruct the flow of urethane with respect to the urethane raw material injection direction and the foaming direction.

  FIG. 5 is a cross-sectional view of the side of the refrigerator box as viewed from above, with the upper side being the back side comprising the rear plate 13 and the lower side being the front end side. Arrow D is the urethane raw material injection direction, and arrow C is the urethane foaming direction. The heat dissipation vip 5 is fixed to the side plate 12 by welding. However, the spacer 6 is a hollow portion and is not in direct contact with each position of the heat radiating pipe, that is, the heat radiating pipe is made of a thin plate and does not have a spacer. As a result, not only the space between the vacuum heat insulating material 3 and the side plate 12 but also the space that is the space between the vacuum heat insulating material 3 and the heat radiating pipe 5 foams and fills the space. The direction in which the urethane flows is between the spacers, and not only does the structure prevent the flow of urethane, but also allows the urethane to flow into the cavity inside the spacer. Thus, the vacuum heat insulating material forming a part of the heat insulating wall is supported by the outer box or the inner box between the outer box and the inner box, and is located at an intermediate position between the inner box and the heat radiating pipe provided inside the outer box. The outer wall of the refrigerator is configured with urethane foam that is disposed and injected and foamed so as to embed the vacuum heat insulating material without contacting the inner box and the heat radiating pipe.

  Here, the clearance between the vacuum heat insulating material 3 and the side plate 12, the rear plate 13, the top plate 14, the bottom plate 15 and the like of the outer box is outside the wall surface on which the vacuum heat insulating material 3 is mounted as shown in FIG. The vacuum heat insulating material 3 is installed so as to be at the center position of the outer box 1 and the inner box 2 in the portion where the gap through which urethane flows between the box and the inner box is the thinnest. That is, the minimum clearance d1 between the vacuum heat insulating material 3 and the outer box 1 and the minimum clearance d2 between the vacuum heat insulating material and the inner box shown in FIG. As a result, the narrowest part through which urethane passes during foaming of urethane foam is substantially uniform, thereby avoiding an extreme imbalance in resistance to urethane flow between the inner box side and the outer box side of the vacuum insulation material. It is possible to avoid problems such as the generation of air voids. When a vacuum heat insulating material having a thickness of 10 mm is actually mounted on the refrigerator, the minimum clearance d1 between the vacuum heat insulating material and the outer box and the minimum clearance d2 between the vacuum heat insulating material and the inner box shown in FIG. It should be noted that the heat radiating pipe 5 is not arranged from the thinnest part so as not to interfere with foaming. As shown in FIG. 5, if the pipe has a diameter of 4 mm, it is possible to prevent the temperature rise of the vacuum heat insulating material by securing the clearance d6 with the vacuum heat insulating material of about 5 mm or more, and the heat insulating efficiency of the vacuum heat insulating material is improved. It is also effective from the viewpoint of life. In this way, the urethane foam intervenes between the heat radiating pipe and the vacuum heat insulating material to suppress the temperature rise of the vacuum heat insulating material, maintain the heat insulating ability of the vacuum heat insulating material, and suppress the deterioration of the vacuum heat insulating material over time. It becomes possible to do.

  Moreover, although it is clearance d3 of the vacuum heat insulating material shown in FIG. 5 and an outer case front edge part, it is good to install in the distance of the range which does not exceed 17% of a depth dimension from an outer case front edge part to a refrigerator depth length direction. For example, if the level is 11% or 7%, no problem is obtained. This is based on an experimental result of a refrigerator having a product outer depth of 699 mm, and is based on an experimental result in which foaming failure does not occur when d3 is 80 mm or less. However, the smaller allowable value of d3 is required to be about the thickness of the heat insulating wall at the front end portion that forms the outer wall of the refrigerator in order to foam smoothly. The result of this experiment is shown in FIG. It was confirmed with a refrigerator having a product depth external dimension of 699 mm, and the occurrence of air voids during foaming was confirmed in three stages of clearance d3 between the vacuum heat insulating material and the front end of the outer box: 50 mm, 80 mm, and 120 mm. In this test, no air void was observed up to a clearance of 80 mm. As a result, it has been found that, during foaming of urethane foam, it is possible to pass through both sides of the inner side of the vacuum heat insulating material and the outer side of the vacuum heat insulating material substantially evenly while the viscosity of the urethane is low. If this d3 exceeds 17% of the refrigerator depth, the urethane viscosity increases, so the minimum clearance d1 between the vacuum insulation and outer box and the minimum clearance d2 between the vacuum insulation and inner box shown in FIG. In some cases, air voids may occur when urethane foam is foamed. That is, it is better to avoid dimensions exceeding 17 percent. Immediately after injecting the urethane foam stock solution as the vacuum heat insulating material approaches the front end of the refrigerator, the liquid urethane foam passes through the vicinity of the vacuum heat insulating material in a low viscosity state even if foamed. Even if the inner box clearance is small, foaming is possible without any problem.

  FIG. 6 shows the schematic structure of the spacer and the relationship between the flow direction of urethane when urethane foam is foamed. At this time, when the spacer width d4 is larger than the clearance d1 between the vacuum heat insulating material and the outer box shown in FIG. On the other hand, when the spacer width d4 is smaller than d1, the pasting area is reduced, and the spacer is peeled off from the vacuum heat insulating material by the foaming pressure. However, if the number of spacers is increased in order to secure the affixing area, problems such as an increase in affixing man-hours and deterioration of heat insulation performance due to heat conduction of the spacers arise. Therefore, in order to prevent the urethane flow direction at the time of foaming and the perpendicular direction to the urethane foaming direction having a width greater than the clearance d1 between the vacuum heat insulating material and the outer box from having a plane or projected width, the spacer has a hole shape. Provide. At this time, it is known from experimental values that it is necessary to secure a urethane flow path having a diameter of the hole or the short side d5 shown in FIG.

  In addition, when installing this spacer, as shown in FIG. 6, by installing the long side of the spacer in parallel with the urethane flow direction at the time of urethane foam foaming, it is possible to effectively eliminate the obstruction factor of urethane flow. it can. In addition, there is a flow path in which urethane can flow in the direction of urethane foaming, but there are also flow paths in other directions, for example, in a direction that intersects with the urethane flow direction. Is effective. In any case, providing a flow path having a wide opening is effective because the flow during foaming is smoothly performed.

  That is, even if the spacer is not installed in parallel with the urethane flow direction, it does not have to have a plane perpendicular to the urethane foaming direction having a width equal to or larger than the clearance d1 between the vacuum heat insulating material and the outer box, or a projection width.

  In addition, when the spacer shape shown in FIG. 6 is used on the side surface, the shape of the refrigerant heat radiating pipe is restricted. Therefore, a spacer to which the pipe relief shape shown in FIG. 7 is applied is used. Thereby, it becomes possible to mount a vacuum heat insulating material with the shape of the heat radiating pipe 5 unchanged. The spacer structure in FIG. 7 is a structure that is hollow and does not hinder the flow of urethane except for the pillar that connects the surface to be bonded to the corrugated vacuum heat insulating material 3 and the surface to be bonded to the outer box 3. If the heat radiating pipe 5 is disposed at a place other than the surface of the spacer that is bonded to the outer box, the urethane flows through the gap between the pipe and the vacuum heat insulating material.

  Further, by mounting a spacer having a large number of urethane flow paths and heat radiating pipe escape shapes as shown in FIG. 7, it is possible to reduce the heat conduction portion of the spacer and suppress deterioration of heat insulation performance. That is, a foamed resin such as urethane is less likely to conduct heat than an ABS synthetic resin. The spacer 6b in FIG. 7 has a corrugated top protruding in the direction of the rear plate 13 of the outer box 1 in a state where one surface is adhered so as to be parallel to the foaming direction of the vacuum heat insulating material 3, and this top is rear plate It is the structure which is made to adhere to and supports a vacuum heat insulating material. Further, a heat radiating pipe 5 is provided on the rear plate at a position corresponding to the bottom of the wave between the tops of the waves. Thereby, a space can be provided between the heat radiating pipe, the spacer, and the vacuum heat insulating material, and the foaming agent can be filled. By using a structure that supports the top of the spacer wave shape at the four corners from the bottom side and making it a spacer that penetrates the middle of the bottom corresponding to this top position, the obstacle to the flow of the foaming agent can be reduced and after foaming the entire spacer is urethane It can be set as the firm structure which fixes firmly.

  Next, the arrangement of the heat radiating pipe will be described with reference to FIG. FIG. 8 is a side sectional view of the refrigerator and a structure explanatory view of the refrigerator viewed from the back side. Inside the refrigerator outer box 1 are attached a vacuum heat insulating material 3 and a heat radiating pipe 5 for the refrigerant circuit. Inside the inner box 2 are a refrigerator compartment 7, a vegetable compartment 8, an ice making compartment 9, and a freezer compartment 10 from above. Each of them is arranged with a partition downward. The refrigerator compartment 7 and the vegetable compartment 8 shown in FIG. 8 are temperature zones of 0 ° C. or higher. On the other hand, the ice making chamber 9 and the freezing chamber 10 are in a temperature range of 0 ° C. or lower. In the present invention, as shown in FIG. 8, the vacuum heat insulating material 3 is installed on the back wall surface in the temperature range of 0 ° C. or lower, and the heat radiating pipe is installed on the back wall surface in the temperature range of 0 ° C. or higher. This enhances the heat insulation capacity of the ice making chamber 9 and the freezing chamber 10 that need to suppress the temperature rise in the refrigerator, and on the wall of the refrigerator compartment 7 and the vegetable compartment 8 where problems such as freezing occur when the temperature becomes 0 ° C. or lower. It is possible to keep the inside of the cabinet at an appropriate temperature by installing a heat radiating pipe. In FIG. 8, the vacuum heat insulating material 3 is provided so as to surround the entire periphery of the storage room in a temperature zone of 0 ° C. or lower, and this vacuum heat insulating material is formed as being fixed to the outer box. However, this vacuum heat insulating material may be fixed to the inner wall surface of the outer box or the inner box through a spacer as shown in FIG. 3 and the vacuum heat insulating material may be embedded by urethane foam injected and foamed. Is natural. With this configuration, a space in a temperature range of 0 ° C. or lower such as a freezing temperature range can be enlarged and effectively used. Furthermore, in this configuration, the heat insulating efficiency is ensured, and the coverage of the vacuum heat insulating material is less than 50% with respect to the surface area of the outer box, so that an economical refrigerator can be obtained.

  A compressor that circulates the refrigerant in the refrigeration cycle is provided in a machine room below the refrigerator. The high-temperature and high-pressure refrigerant compressed by rotating the motor of the compressor first circulates through the heat radiating pipe and releases high-temperature heat to the outside through the metal in the outer box. Therefore, the storage room at the position facing the heat radiating pipe is affected by a relatively high temperature. When the vegetable freeze prevention heater 11 of the vegetable compartment 8 of FIG. 8 is applied to a refrigerator provided at a position where the vegetable compartment side of the partition that partitions the storage compartment is heated, the temperature of the vegetable compartment increases due to the influence of the heat radiating pipe 5. Due to the tendency, the heater is less energized, and the effect of reducing the power consumption can be obtained by this decrease in the heater energization rate. Since the vacuum insulation material should have a lower temperature from the viewpoint of life and heat insulation efficiency, it should be placed in a part different from the part where the heat-dissipating pipe is provided. It is good to use as a heat insulating material. In particular, it is effective to use the surroundings of the freezing room that maintains a low temperature of −18 ° C. or less to insulate the outside air and other storage rooms so as to reduce the influence on the freezing room having a large temperature difference. At this time, when the portion where the heat radiating pipe is arranged and the portion where the refrigeration room is arranged intersect, the connecting portion of the heat radiating pipe is arranged so as to take a path not contacting the vacuum heat insulating material. In order to prevent the path of the heat radiating pipe from intersecting with the position where the vacuum heat insulating material is disposed, a storage room for cooling at 0 ° C. or lower, particularly a freezing room, may be disposed at the upper part.

  Next, another example of the configuration of FIG. 8 according to the present invention will be described with reference to FIG. FIG. 9 is a side sectional view of the refrigerator. The vacuum heat insulating material 3 is attached to the outer box or inner box of the refrigerator, and the heat radiation pipe 5 of the refrigerant circuit is attached to the outer box. The refrigerator will be described using an example in which the refrigerator compartment 7, the vegetable compartment 8, the ice making compartment 9, and the freezer compartment 10 are arranged from the top. The inside temperature of the refrigerator compartment 7 and the vegetable compartment 8 shown in FIG. 9 is 0 ° C. or higher, and the heat insulation thickness d 7 of the wall surface is equal to the heat insulation thickness d 8 of a room below 0 ° C. such as the ice making chamber 9 or the freezer compartment 10. Compared to 20-40%, the insulation is made thin. This is because the heat insulation thickness is suppressed to the minimum in order to increase the internal volume and reduce the installation size. In the upper section thickness d7, the vacuum heat insulating material 3 is fixed to the outer box 1, and the inner box side is obtained by foaming urethane resin to obtain the thickness of the heat insulating wall formed from the inner box and the outer box. On the other hand, in the lower section thickness d8, the heat radiating pipe 5 is fixed to the outer box 1 without the vacuum heat insulating material 3, and a urethane resin is foamed between the inner box and the outer box to form heat insulation formed from the inner box and the outer box. Gaining wall thickness. Of course, a spacer as shown in FIG. 6 may be used, and the vacuum heat insulating material may be embedded by urethane foam that has been injected and foamed. In this case, the heat radiating pipes are gathered upward, and the pipes connected to the heat radiating pipes can be easily disposed by separating the heat radiating pipes and the vacuum heat insulating material by using the spacers described above.

  The lower heat insulation thickness d8 can maintain the heat insulation capacity by the thickness, and the upper heat insulation thickness lowers the heat insulation capacity of the cold room 7 having a low heat insulation capacity. To be installed. At this time, since the heat radiation pipe should have a lower temperature from the viewpoint of the life of the vacuum heat insulating material and the heat insulating efficiency, a path that does not contact the vacuum heat insulating material is taken. With this configuration, it is possible to effectively use a refrigerating space such as a refrigerating room, use a minimum amount of vacuum heat insulating material, and shorten the heat radiation pipe, so that an economical refrigerator can be manufactured. In other words, with this configuration, it is possible to provide an economical refrigerator in which the heat insulating efficiency is ensured and the coverage of the vacuum heat insulating material is less than 50% with respect to the surface area of the outer box.

  In the present invention, as shown in FIG. 1, the urethane foam stock solution is injected from an inlet provided on the back of the refrigerator that is faced up with the front of the refrigerator product facing downward. When the injection of the urethane foam stock solution is completed, the foaming of the urethane foam starts, and the urethane foams while flowing in the direction of the arrow in FIG. At this time, the viscosity of the urethane foam is small because it is a liquid at the start of foaming, but the viscosity increases because it changes to a solid as foaming proceeds. That is, when urethane foam is foamed, the viscosity of the urethane foam is lower as the refrigerator front end is lower and closer to the rear. In other words, when vacuum insulation is embedded in the side of the refrigerator between the inner box and the outer box, if it is mounted near the back, the viscosity of the urethane is high, which may cause urethane foam failure near the vacuum insulation Becomes higher.

  On the other hand, the refrigerator of the present invention includes a hard urethane foam and a vacuum heat insulating material between the outer box and the inner box, embedded in a state where the vacuum heat insulating material does not contact the outer box and the inner box, and the vacuum heat insulating material is radiated from the heat sink. It is installed at a position between the inner box and the inner box, and a good heat insulating performance can be obtained by defining the arrangement positional relationship between the vacuum heat insulating material and the inner box outer box according to the change in viscosity at the time of urethane foaming. . As a result, even when a vacuum heat insulating material is mounted, since the heat radiating pipe can maintain the conventional length and heat radiating shape, it is possible to increase the heat insulating capacity without deteriorating the condensation capacity. Moreover, the urethane foam is interposed between the heat radiating pipe and the vacuum heat insulating material, so that the temperature of the vacuum heat insulating material can be suppressed from rising and the heat insulating ability of the vacuum heat insulating material can be maintained. In addition, it is possible to suppress aged deterioration of the vacuum heat insulating material.

  For example, in the refrigerator of the present invention, when a vacuum heat insulating material is installed above a dimension position within about 7% of the product depth dimension from the front end surface portion of the outer box which is a lower part when urethane is injected and foamed, the maximum heat insulation is achieved when urethane is injected and foamed. It is possible to secure the minimum gap that can ensure the performance, and if it is not closer to the end face than the dimension position exceeding 17% of the product depth dimension, the viscosity becomes high, and there is a possibility of causing quality defects such as generation of air voids when urethane foams. is there. That is, when selecting a dimensional position of about 7% or less, the clearances d1 and d2 between the outer box and the inner box may be set to a minimum value that can secure, for example, about 10 mm, and there is a margin in heat insulation performance. When installing a vacuum heat insulating material on the top, that is, away from the end face, the position where the foaming viscosity does not become too high, that is, the dimension position exceeding 17% which does not cause quality defects such as air voids when urethane is foamed It is necessary to be closer to the end face than. As a result, it is possible to manufacture a refrigerator in which desired quality can be obtained by reliably injecting and foaming urethane due to the presence of the vacuum heat insulating material in the vicinity of the end face portion and ensuring the heat insulating performance. Thus, according to the present invention, the vacuum heat insulating material approaches the front end of the refrigerator, and immediately after the injection of the urethane foam stock solution, the liquid urethane foam passes through the vicinity of the vacuum heat insulating material in a low viscosity state. Even if the clearance between the material, the outer box, and the inner box is small, foaming can be performed without any problem, and a clearance necessary for flow can be secured at a high viscosity position.

  Next, the refrigerator of the present invention includes a hard urethane foam and a vacuum heat insulating material between the outer box and the inner box, embedded in a state where the vacuum heat insulating material does not contact the outer box and the inner box, and the vacuum heat insulating material and the outer box, When the clearance with the inner box is equally divided into about 1/3 of each, effective heat insulation performance can be obtained. You may install both clearances ensuring 1/3 or more of the wall surface insulation thickness of a refrigerator, respectively.

  For example, by making the clearance with the vacuum heat insulating material at the time of urethane foaming in the manufacture of the refrigerator about 1/3 of the refrigerator wall surface insulating thickness, the side heat insulating thickness of the refrigerator is about 30 mm, and the vacuum heat insulating material is about 10 mm, Vacuum insulation is buried in the center of the outer box and inner box, and the urethane flow passage area on both sides of the vacuum insulation is equal, so the vacuum due to pressure imbalance on the vacuum insulation due to the foaming pressure of urethane Inhibition of urethane flow due to deformation of the heat insulating material can be prevented, and problems such as a decrease in box strength due to urethane voids and defective exteriors can be avoided. Moreover, the vacuum heat insulating material can secure a thickness of about 10 mm, and a reliable heat insulating performance can be ensured.

  Furthermore, the refrigerator of the present invention is provided with a hard urethane foam and a vacuum heat insulating material between the outer box and the inner box, and when the vacuum heat insulating material is embedded in a state not in contact with the outer box and the inner box, the urethane foam at the time of foaming the urethane foam A spacer provided with a flow path through which air and urethane can pass in both the direction and the foaming direction and the vertical direction is mounted. By mounting the urethane channel shape on the spacer itself that supports the vacuum insulation material, the urethane flow is not hindered by the spacer, and air can be passed through the urethane channel shape provided in the spacer, preventing air lock In addition, foaming is possible without impeding the flow of urethane, and problems such as a drop in box strength and poor exterior due to urethane voids can be avoided.

  In the case of a simple block-shaped spacer, the heat insulation performance may be deteriorated due to the heat conduction of the spacer itself. However, in the spacer provided with the urethane flow path by the cavity, the united urethane forms the spacer itself, so the thermal resistance Becomes larger, and heat conduction from the spacer to the interior can be suppressed.

  When the vacuum heat insulating material is mounted on the rear surface of the refrigerator, the refrigerator of the present invention is mounted on a portion where the heat insulating thickness is less than the average heat insulating thickness of the refrigerator, and on the other hand, the heat radiating pipes are aggregated and installed on the portion where the vacuum heat insulating material is not mounted. To do. For this reason, the heat insulation capacity is improved by installing a vacuum heat insulating material in the part where the heat insulation thickness on the back of the refrigerator is thin, while the heat radiation pipe is installed in the part where the heat insulation thickness is thick and the heat insulation capacity is high. The effect of preventing intrusion is obtained. In addition, the refrigerator of the present invention is equipped with a vacuum heat insulating material on the wall surface where the inside temperature is 0 ° C. or lower when a vacuum heat insulating material is mounted on the rear surface of the refrigerator, and on the other hand, a heat radiating pipe is gathered at a place where the vacuum heat insulating material is not installed. You may make it the structure to carry out. By installing a vacuum heat insulating material on the wall surface where the temperature in the refrigerator compartment is 0 ° C or less to reduce the amount of heat intrusion into the compartment, and consolidating the heat radiation pipes on the wall surface where the temperature in the refrigerator compartment is 0 ° C or higher. It is possible to efficiently maintain the internal temperature of 0 ° C. or lower.

  In the refrigerator of the present invention, a comb-shaped or U-shaped radiating pipe is installed in the vertical direction of the refrigerator product. According to this, since the turn processing part can be reduced while maintaining the length of the heat radiating pipe by forming a comb-shaped or U-shaped heat radiating pipe shape in the vertical direction of the refrigerator, the processing cost is reduced. It is possible to provide an inexpensive refrigerator.

  According to the present invention, the foamed urethane foam passes through the vicinity of the vacuum heat insulating material in a state of low viscosity, so that the vacuum heat insulation does not occur due to poor exterior of the refrigerator due to poor fluidity and poor heat insulating capacity due to poor urethane heat insulating material. It is possible to mount the material, and since the refrigerant piping of the refrigerator can be mounted in the same way as a conventional refrigerator by mounting the vacuum heat insulating material in a position floating from the outer box, the vacuum heat insulating material is mounted without reducing the condensation capacity Thus, it is possible to manufacture a refrigerator that improves the heat insulation ability by reducing the cooling capacity and the power consumption.

  As described above, according to the present invention, even when a vacuum heat insulating material is mounted, since the heat radiating pipe can maintain the conventional length and heat radiating shape, it is possible to increase the heat insulating capacity without deteriorating the condensation capacity. Become. Moreover, the urethane foam is interposed between the heat radiating pipe and the vacuum heat insulating material, so that the temperature of the vacuum heat insulating material can be suppressed from rising and the heat insulating ability of the vacuum heat insulating material can be maintained. In addition, it is possible to suppress aged deterioration of the vacuum heat insulating material.

  Further, since urethane passes through the vicinity of the vacuum heat insulating material in a state of low viscosity when the urethane is foamed in the refrigerator, even if the clearance between the vacuum heat insulating material, the outer box, and the inner box is small, foaming can be performed without any problem.

  In addition, by securing the clearance with the vacuum heat insulating material at least 1/3 of the wall insulation thickness of the refrigerator at the time of refrigerator urethane foaming, foaming is possible without hindering the flow of urethane, and the strength of the box due to urethane voids Problems such as deterioration and exterior defects can be avoided.

  In addition, by installing a urethane shape on the spacer itself that supports the vacuum heat insulating material, urethane fluidity is ensured, foaming is possible without impeding urethane flow, and the box strength is reduced by urethane voids. Problems such as defects can be avoided. In addition, with a simple block-shaped spacer, the heat insulation performance may be deteriorated due to the heat conduction of the spacer itself, but the spacer with the urethane channel increases the thermal resistance and suppresses heat conduction from the spacer to the interior. It becomes possible to do.

  In addition, even when vacuum insulation is installed, the heat radiation pipe can maintain the conventional length and heat radiation shape, so that the heat insulation capacity can be improved without deteriorating the condensation capacity. Alternatively, by using a U-shaped radiating pipe shape, the number of turn processing parts can be reduced while maintaining the length of the radiating pipe, so that the processing cost can be suppressed and an inexpensive refrigerator can be provided. Moreover, the urethane foam is interposed between the heat radiating pipe and the vacuum heat insulating material, so that the temperature of the vacuum heat insulating material can be suppressed from rising and the heat insulating ability of the vacuum heat insulating material can be maintained. In addition, it is possible to suppress aged deterioration of the vacuum heat insulating material.

  In addition, vacuum insulation is installed on the backside of the refrigerator where the heat insulation thickness is thin to improve the heat insulation capacity, while heat radiation intrudes into the cabinet by installing a heat radiation pipe at a high heat insulation capacity area. The effect which prevents is obtained.

  Moreover, a vacuum heat insulating material is mounted on the wall surface where the temperature in the refrigerator compartment is 0 ° C. or less to reduce the amount of heat intrusion into the compartment, and the heat radiating pipe is concentrated on the wall surface where the temperature in the refrigerator compartment is 0 ° C. or more. Thus, it is possible to efficiently maintain the internal temperature of 0 ° C. or lower.

  ADVANTAGE OF THE INVENTION According to this invention, even when a vacuum heat insulating material is mounted, the refrigerator which can raise the heat insulation capability without the harmful effect which reduces a condensation capability is obtained. In addition, urethane foam intervenes between the heat radiating pipe and the vacuum heat insulating material, so that the temperature rise of the vacuum heat insulating material can be suppressed, the heat insulating ability of the vacuum heat insulating material can be maintained, and the aged deterioration of the vacuum heat insulating material can also be suppressed. Can be obtained, and a method for producing a high-quality refrigerator can be obtained.

Schematic explanatory drawing at the time of urethane injection of the refrigerator in Embodiment 1 of the present invention. The urethane flow schematic explanatory drawing at the time of urethane foaming of the refrigerator in Embodiment 1 of this invention. The refrigerator front sectional view in Embodiment 1 of the present invention. The refrigerator side surface sectional drawing in Embodiment 1 of this invention. The refrigerator upper surface sectional view in Embodiment 1 of the present invention. FIG. 3 is a schematic explanatory diagram of a spacer in the first embodiment of the present invention. FIG. 3 is a schematic explanatory diagram of a spacer in the first embodiment of the present invention. The refrigerator side surface and back sectional drawing in Embodiment 1 of this invention. The refrigerator side surface and back sectional drawing in Embodiment 1 of this invention. Explanatory drawing of the experimental result of the refrigerator in Embodiment 1 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Outer box, 2 Inner box, 3 Vacuum insulation material, 4 Urethane foam, 5 Radiation pipe, 6 Spacer, 7 Refrigeration room, 8 Vegetable room, 9 Ice making room, 10 Freezing room, 11 Vegetable freezing prevention heater, 12 Side plate, 13 Rear plate, 14 Top plate, 15 Bottom plate, 16 Urethane inlet.

Claims (11)

A vacuum heat insulating material disposed between the outer box and the inner box and supported by the outer box or the inner box at an intermediate position between the inner box and the heat radiating pipe provided inside the outer box; and And a urethane foam that is injected and foamed so as to be embedded without contacting the inner box and the heat radiating pipe. The refrigerator according to claim 1, wherein an inlet for the urethane foam is provided on the back side of the outer box, and a vacuum heat insulating material is installed on the back side from a predetermined distance range in the refrigerator product depth direction from the front end surface part. The refrigerator according to claim 1 or 2, wherein the clearance between the vacuum heat insulating material and the outer box and the inner box is set to be approximately equal to about 1/3 of the wall surface insulation thickness of the refrigerator. A vacuum heat insulating material disposed between the outer box and the inner box and fixed to and supported by the outer box or the inner box with a spacer without being in contact with the outer box and the inner box, and embedded so as to cover the vacuum heat insulating material And a urethane foam injected and foamed between the outer box and the inner box, wherein the spacer is provided with a flow path through which the air and urethane foam can pass. When mounting the vacuum heat insulating material on the back of the refrigerator, the vacuum heat insulating material is mounted at a position corresponding to the wall surface where the temperature in the refrigerator cabinet is 0 ° C. or lower, while the heat radiating pipe is gathered at the location where the vacuum heat insulating material is not mounted. A refrigerator characterized in that the wall thickness is made thicker at a position where the heat radiating pipes are gathered than a position where the vacuum heat insulating material is mounted. When the vacuum heat insulating material is mounted on the back of the refrigerator, the vacuum heat insulating material is mounted on a portion where the heat insulating thickness between the outer box and the inner box is less than the average heat insulating thickness of the refrigerator, while the vacuum heat insulating material is not mounted. A refrigerator characterized in that the heat insulating wall is made thicker so that the heat insulating wall surface is thicker than the position where the vacuum heat insulating material is mounted. The refrigerator according to any one of claims 1 to 6, wherein the heat radiating pipe is a pipe that repeats a comb-shaped or U-shaped pattern vertically in the refrigerator. The urethane foam is foamed in a state where the refrigerator rear surface is facing upward, and the flow path through which the air and the urethane foam of the spacer can pass has flow paths in a plurality of directions including a substantially urethane foaming direction. The refrigerator in any one of 7. Arranging a vacuum heat insulating material at an intermediate position between the outer box and the inner box between the outer box or the inner box and supported by a spacer in the outer box or the inner box between the inner box and the radiating pipe provided inside the outer box; Injecting urethane foam from the back side of the refrigerator so as to embed the vacuum heat insulating material without contacting the inner box and the heat radiating pipe, and air and urethane foam when foaming the urethane foam are flow paths of the spacer And a step of foaming so as to cover the vacuum heat insulating material by passing from the bottom through the top. The manufacturing method of the refrigerator according to claim 9, wherein a gap between the outer box and the inner box of the vacuum heat insulating material in which the urethane foam is foamed is substantially equal. The method for manufacturing a refrigerator according to claim 9 or 10, wherein, when the urethane foam is injected and foamed, the urethane foam flows into a spacer supporting the vacuum heat insulating material and can be filled.

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