JP5506733B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator using 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 vacuum heat insulating materials having much better heat insulating performance than rigid urethane foams have come out.

As such a refrigerator, for example, there is one in which a hard urethane foam and a vacuum heat insulating material are provided between an outer box and an inner box, and the vacuum heat insulating material is directly attached to the outer box with an adhesive. In this method, the attachment workability is good in the manufacturing process of the refrigerator because the pasting location is flat. In addition, it is possible to mount a vacuum heat insulating material having a large area without being interfered by the unevenness of the 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. For this reason, although heat leakage is improved, on the other hand, energy saving improvement may not be obtained due to a decrease in condensation power. Furthermore, the deterioration over time of the vacuum heat insulating material could not be suppressed.

Therefore, the vacuum heat insulating material is arranged on both sides, the shop surface, the back surface, the bottom surface, and the front surface, and the coverage of the vacuum heat insulating material is more than 50% and 80% or less with respect to the surface area of the outer box, thereby enhancing the energy saving effect. Proposed to suppress the deterioration over time of the vacuum insulation material by embedding the vacuum insulation material in the rigid urethane foam between the outer box and the inner box on the surface where the outer box surface temperature becomes higher than the outside air temperature (For example, refer to Patent Document 1).
However, in this case, a spacer is installed to fix the position of the vacuum heat insulating material in a state where it is not in contact with the outer box and the inner box, but both the vacuum heat insulating material and the spacer are subjected to pressure when urethane foam is foamed. May shift. If the fixing position of the vacuum heat insulating material is shifted, the space between the vacuum heat insulating material and the outer box or the inner box is narrowed, the urethane foam flow path is blocked, an unfilled portion of urethane foam is generated, and the power consumption of the refrigerator May increase.

  Therefore, between the outer box and the inner box, a hard urethane foam and a vacuum heat insulating material supported by a spacer are provided, and the urethane of the spacer is embedded in a state where the vacuum heat insulating material does not contact the outer box and the inner box. Holes for urethane foam channels are formed on the wall surface perpendicular to the foam flow direction, and the positional relationship between the vacuum insulation material and the inner and outer boxes according to changes in viscosity when urethane foam is foamed. Then, what has ensured the fluidity | liquidity at the time of urethane foam foaming and obtained the heat insulation performance with sufficient quality is proposed (for example, refer patent document 2).

Japanese Patent Laid-Open No. 2003-14368 (FIG. 3) Japanese Patent No. 4111096 (Claim 2, FIG. 3)

  By the way, in the case where the vacuum heat insulating material is supported by the spacer without being in contact with the outer box and the inner box and fixed to the outer box or the inner box and embedded, the number of spacers can be increased, or the spacer By enlarging itself, the position of a vacuum heat insulating material can be fixed reliably. However, increasing the number of spacers or enlarging the spacers in this way causes the spacers to hinder the flow of the urethane foam, which may cause an unfilled portion of the urethane foam. Furthermore, increasing the number and size of spacers leads to an increase in spacer material costs and assembly man-hours, leading to an increase in product cost. These are also true for spacers that ensure fluidity when foaming urethane foam.

  On the other hand, when the number of spacers is simply reduced, the interval between the spacers becomes long and the vacuum heat insulating material supported by the spacers bends. Generation | occurrence | production of this bending of a vacuum heat insulating material causes the result of narrowing the space | interval of a vacuum heat insulating material and an outer box or an inner box, obstruct | occludes a urethane foam flow path, and becomes an obstacle of a urethane foam flow.

  The present invention has been made to solve the above problems, and an object thereof is to reduce the number of spacers while suppressing the occurrence of bending of a vacuum heat insulating material.

  The refrigerator according to the present invention has the following configuration. That is, a box comprising a spacer, a vacuum heat insulating material supported by the spacer, and a urethane foam filled and injected so as to embed the vacuum heat insulating material between the outer box and the inner box. In the refrigerator having the above, the spacer is constituted by a rectangular wave plate, the top surface of each crest of the rectangular wave plate is a receiving part of the vacuum heat insulating material, and the lower surface of each trough of the rectangular wave plate is An abutting portion with the outer box or the inner box is provided, and an extension portion is provided on the top surface of each peak portion of the rectangular wave plate so as to extend a predetermined amount laterally.

  In the refrigerator according to the present invention, the spacer is constituted by a rectangular wave plate, the top surface of each peak portion of the rectangular wave plate is a receiving portion of the vacuum heat insulating material, and each trough portion of the rectangular wave plate Since the lower surface of the plate is a contact portion with the outer box or the inner box, and further, an extension portion is provided on the top surface of each peak portion of the rectangular wave plate so as to extend a predetermined amount to the side. Only the contact area with the material can be increased toward the side. For this reason, the number of spacers can be reduced while suppressing the occurrence of bending of the vacuum heat insulating material without inhibiting the flow of the urethane foam.

It is a schematic explanatory drawing at the time of urethane foam injection | pouring of the refrigerator which concerns on embodiment of this invention. It is a schematic explanatory drawing of the urethane foam flow at the time of urethane foam foaming of the refrigerator which concerns on embodiment of this invention. It is front sectional drawing which shows the refrigerator which concerns on embodiment of this invention. It is AA arrow sectional drawing of FIG. It is a BB arrow sectional view of Drawing 3. It is a perspective view which shows the relationship of the flow direction at the time of foaming of the spacer, the vacuum heat insulating material, the heat radiating pipe, and urethane foam of the refrigerator which concerns on embodiment of this invention. It is side surface sectional drawing and back surface sectional drawing which show the refrigerator which concerns on embodiment of this invention. It is side surface sectional drawing and back surface sectional drawing which show the refrigerator which concerns on embodiment of this invention. It is explanatory drawing of the experimental result of the refrigerator which concerns on embodiment of this invention. It is an expansion perspective view which shows the relationship between the spacer which concerns on embodiment of this invention, a heat radiating pipe, and a urethane foam foaming direction. It is sectional drawing which shows the relationship between the outer box which concerns on embodiment of this invention, an inner box, a spacer, a vacuum heat insulating material, and a heat radiating pipe.

The present invention will be described below with reference to illustrated embodiments.
FIG. 1 is a schematic explanatory diagram when injecting urethane foam in a refrigerator according to an embodiment of the present invention. FIG. 2 is a schematic explanatory diagram of the urethane foam flow when foaming urethane foam in the refrigerator according to the embodiment of the present invention. The refrigerator according to the embodiment of the present invention has a box body in which a metallic outer box 1 such as iron and an inner box 2 made of synthetic resin such as ABS (FIG. 3) are integrated as shown in FIGS. Install the door side down. The outer box 1 has a side plate 12 that forms a side surface, a rear plate 13 that forms a back surface, and a bottom plate 15 that forms a bottom surface. At the time of injecting the urethane foam, the stock solution of the urethane foam is injected from the injection port 16 provided between the back surface and the side surface with the rear surface of the outer box 1 facing up and the front surface of the refrigerator product, that is, the door side facing downward.

  In the refrigerator according to the embodiment of the present invention, when the injection of the urethane foam stock solution ends, the foaming of the urethane foam starts, and the urethane in the arrow direction in FIG. Foam foams while flowing. At this time, the viscosity of the urethane foam is small because it is liquid on the door side at the start of foaming, but as the foaming progresses, that is, it moves to the upper part and changes to a solid, the viscosity increases toward the upper part. To do. That is, at the time of urethane foam foaming, the viscosity of the urethane foam increases as the refrigerator front end is small and approaches the back. That is, when the vacuum heat insulating material is embedded in the middle of the inner box 2 and the outer box 1 on the side surface of the refrigerator, the urethane foam is foamed near the vacuum heat insulating material because the viscosity of the urethane foam is large when it is mounted near the back surface. There is a high possibility that defects will occur. That is, the viscosity of the side surface portion is smaller than that of the front surface portion and that of the rear surface portion is smaller than that of the inner box.

  FIG. 3 is a front sectional view showing the refrigerator according to the embodiment of the present invention. As shown in FIG. 3, a vacuum heat insulating material 3 is disposed between an outer box 1 made of a metal plate and an inner box 2 made of a synthetic resin. The vacuum heat insulating material 3 is installed at a certain distance from the outer box 1 by a spacer 60 made of a thin plate resin. Further, between the outer box 1 and the inner box 2 made of synthetic resin, a urethane foam 4 as a heat insulating material is filled so as to embed a vacuum heat insulating material 3. That is, the vacuum heat insulating material 3 is a urethane foam between the outer box 1 and the inner box 2 by injecting a urethane foam stock solution and performing foaming after a certain distance is secured to the outer box 1 by the spacer 60. 4 to be embedded. In FIG. 3, the urethane foam raw material is injected from the back of the figure toward the front.

  4 is a cross-sectional view taken along line AA in FIG. In FIG. 4, as the vacuum heat insulating material 3 indicated by hatching, 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 60 for fixing and supporting the vacuum heat insulating material 3 to the outer box 1 is constituted by a rectangular wave plate made of, for example, ABS resin and extending along the urethane foam flow direction (foaming direction). The spacer 60 and the metal of the outer box 1 and the nylon resin forming the outer surface of the vacuum heat insulating material 3 are bonded and fixed by, for example, a rubber adhesive. A vacuum heat insulating material 3 is fixed with a spacer 60 between the side plate 12 of the outer box 1 of the refrigerator and the side plate of the inner box 2, and between the vacuum heat insulating material 3 and the side plate 12, and between the inner box 2 and the vacuum heat insulating material. Between 3, the urethane foam flows.

  FIG. 10 is an enlarged perspective view showing a relationship among the spacer, the heat radiating pipe, and the urethane foam foaming direction according to the embodiment of the present invention. FIG. 11 is a cross-sectional view showing a relationship among an outer box, an inner box, a spacer, a vacuum heat insulating material, and a heat radiating pipe according to an embodiment of the present invention. The spacer 60 is comprised by the rectangular wave type plate 6 extended along a urethane foam foaming direction like FIG.10 and FIG.11. The rectangular wave plate 6 has a continuous corrugated form as viewed from the side, and the top of each wave peak and the bottom of the valley between each wave peak are flat. It is formed on the surface. Hereinafter, the upper surface of the flat surface at the top of each wave crest is referred to as “the top surface of the crest”, and the lower surface of the bottom of the trough between the crests of each wave is referred to as “the bottom surface of the trough”. The rectangular wave plate 6 has a predetermined width (for example, 50 mm), and the top surface 6 a of each peak portion is formed as a receiving portion of the vacuum heat insulating material 3. Further, the rectangular wave plate 6 is formed such that the bottom surface of each trough portion 6 b is a contact portion with the outer box 1 or the inner box 2. In addition, the rectangular wave plate 6 has holes 6c serving as flow paths at the time of foaming of urethane foam on each connection surface connecting the top surface 6a of each peak portion and the lower surface of each valley portion 6b of the rectangular wave plate. Is formed. Further, the rectangular wave plate 6 is formed with an extended portion 6d that extends a predetermined amount (for example, 50 mm) laterally on the top surface 6a of each peak portion. Here, the side of the top surface 6 a of the peak portion refers to a direction orthogonal to the longitudinal direction of the rectangular wave plate 6. In addition, although the extension part 6d is formed in the zigzag shape extended in the reverse direction between adjacent peak parts here, it is not restricted to this. That is, the extension 6d may be formed on both sides of the top surface 6a of each peak, for example, or may be formed on one side of the top surface 6a of each peak.

  FIG. 5 shows a cross-sectional view taken along the line B-B of FIG. 3, that is, a cross-sectional view of the side portion of the refrigerator box as viewed from above. In FIG. 5, an arrow D indicates the urethane foam stock solution injection direction, and an arrow C indicates the urethane foam foaming direction. The heat radiating pipe 5 is juxtaposed in a direction intersecting the urethane foam foaming direction, and is fixed to the side plate 12 of the outer box 1 by welding. However, the spacer 60 is a hollow portion and is not in direct contact with each position of the heat radiating pipe 5. That is, the heat radiating pipe 5 is arranged in a bridge shape on the top surface 6a of the peak portion of the rectangular wave plate 6, and is disposed so as to cross a portion surrounded by the bridge, that is, a lower space portion of the top surface 6a of the peak portion. (FIG. 10, FIG. 11). As a result, not only the space between the vacuum heat insulating material 3 and the side plate 12 but also the space between the vacuum heat insulating material 3 and the heat radiating pipe 5 is foamed with urethane foam to fill the space. For this reason, the refrigerator which concerns on embodiment of this invention can surround the circumference | surroundings of the thermal radiation pipe 5 with urethane foam, and can prevent the heat | fever penetration | invasion from the spacer 60. FIG. The direction in which the urethane foam stock solution flows is mainly the gaps between the spacers 60, and the urethane foam stock solution flows not only in the structure that does not obstruct the flow of the urethane foam, but also in the cavity inside the spacer 60. . Thus, the vacuum heat insulating material 3 that forms a part of the heat insulating wall is supported by the outer box 1 or the inner box 2 via the spacer 60 between the outer box 1 and the inner box 2 and is provided inside the outer box 1. It arrange | positions with a clearance gap also between the heat-radiation pipe 5 made. The refrigerator according to the embodiment of the present invention includes the vacuum heat insulating material 3 and the urethane foam 4 injected and foamed so as to be embedded without contacting the inner box 2 and the heat radiating pipe 5. The outer wall is configured.

As shown in FIG. 5, the vacuum heat insulating material 3 is a wall surface on which the vacuum insulating material 3 is mounted, and the outer box 1 and the inner box 2 are located at the thinnest gap where the urethane foam stock solution flows between the outer box 1 and the inner box 2. It is installed so as to be in the center position. That is, the vacuum heat insulating material 3 is installed at a position where 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 3 and the inner box 2 shown in FIG. Is done.
Thereby, the refrigerator according to the embodiment of the present invention is the extreme urethane on the inner box side and the outer box side of the vacuum heat insulating material 3 by equalizing the narrowest part through which the urethane foam stock solution passes when foaming urethane foam. Unevenness of flow resistance of the foam stock solution can be avoided, and problems such as air void generation during foaming can be avoided. 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 3 and the outer box 1 and the minimum clearance d2 between the vacuum heat insulating material 3 and the inner box 2 shown in FIG. Both are about 12 mm. It should be noted that the heat radiating pipe 5 is not disposed at the thinnest part so as not to interfere with foaming. As shown in FIG. 5, in the refrigerator according to the embodiment of the present invention, if the heat radiating pipe 5 has a diameter of 4 mm, the clearance d6 between the heat radiating pipe 5 and the vacuum heat insulating material 3 is ensured to be about 5 mm or more. The temperature rise of the material 3 can be prevented, the heat insulation efficiency of the vacuum heat insulating material 3 is improved, and it is effective from the viewpoint of life. Thus, in the refrigerator according to the embodiment of the present invention, the urethane foam is interposed between the heat radiating pipe 5 and the vacuum heat insulating material 3, thereby suppressing the temperature rise of the vacuum heat insulating material 3, and the vacuum heat insulating material 3. It is possible to maintain the heat insulation ability of the vacuum heat insulating material 3 and to suppress the deterioration over time of the vacuum heat insulating material 3.

  Further, the clearance d3 between the vacuum heat insulating material 3 and the front end of the outer box 1 shown in FIG. 5 is set to a distance not exceeding 17% of the depth dimension in the refrigerator depth length direction from the front end of the outer box. For example, if the level is 11% or 7%, there is no problem. This is based on an experimental result of a refrigerator having a product outer depth dimension of 699 mm, and based on an experimental result in which defective foaming did not occur when d3 was 80 mm or less. However, the smaller allowable value of d3 is required to be about the thickness of the heat insulating wall on the front surface forming the outer wall of the refrigerator in order to smoothly foam. The experimental results are shown in FIG. This experimental result was confirmed with a refrigerator having a product depth external dimension of 699 mm, and the generation of air voids during foaming in three stages of the clearance d3 between the vacuum heat insulating material 3 and the front end of the outer box 1 of 50 mm, 80 mm, and 120 mm. Have confirmed. In this test, no air void was observed up to a clearance of 80 mm. As a result, it has been found that when urethane foam is foamed, it is possible to evenly pass through both the inner box side and the outer box side of the vacuum heat insulating material with the viscosity of the urethane foam being low. If this clearance d3 exceeds 17% of the refrigerator depth length, air voids may be generated when urethane foam is foamed. That is, it is better to avoid dimensions exceeding 17%. By bringing the vacuum heat insulating material 3 closer to the front surface of the refrigerator, the urethane foam in a liquid state can be passed through the vicinity of the vacuum heat insulating material in a low viscosity state even after foaming after injecting the urethane foam stock solution. For this reason, even if the clearance between the vacuum heat insulating material and the outer box 1 and the inner box 2 is small, foaming can be performed without any problem.

  FIG. 6 is a perspective view showing the relationship between the flow direction during foaming of the spacer, the vacuum heat insulating material, the heat radiating pipe, and the urethane foam of the refrigerator according to the embodiment of the present invention. When the spacer width (width in the extending direction of the rectangular wave plate of the top surface 6a of each peak) d4 is larger than the minimum clearance d1 between the vacuum heat insulating material 3 and the outer box 1 shown in FIG. It becomes an obstacle to flow. On the other hand, when the spacer width d4 is smaller than the minimum clearance d1, the pasting area is reduced, and the spacer 60 is peeled off from the vacuum heat insulating material 3 by the foaming pressure. Further, when 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 60 occur as described above. Therefore, in order to increase only the contact area portion of the spacer 60 with the vacuum heat insulating material without increasing the spacer width d4 that affects the entire spacer 60, the top surface 6a of each mountain portion extends laterally. The extended part 6d to be taken out is provided in a staggered manner. Furthermore, a rectangular (or circular) hole 6c serving as a flow path when foaming urethane foam is formed on each connection surface that connects the top surface 6a of each peak and the lower surface of each valley 6b. It has been experimentally known that the hole 6c can secure a urethane foam flow path by setting the average value of the short side (diameter in the case of a circle) d5 shown in FIG.

  When the spacer 60 is installed, as shown in FIGS. 6 and 10, the direction of the extension direction of the spacer 60 is set in parallel with the urethane foam flow direction when urethane foam is foamed. Thereby, in the refrigerator which concerns on embodiment of this invention, the obstruction factor of urethane foam flow can be excluded effectively. In addition, the spacer 60 is provided with a hole 6c serving as a flow path when foaming urethane foam on each connection surface that is a wall surface orthogonal to the urethane foam flow direction. In addition, the spacer 60 has no wall in the direction intersecting the urethane foam foaming direction, and the urethane foam 4 can flow in the direction intersecting the urethane foam foaming direction, so that the flow during foaming is performed smoothly. .

  In short, it is important that there is no wall with a width greater than the minimum clearance d1 between the vacuum heat insulating material and the outer box with respect to the urethane foam foaming direction, even if the spacer is not installed parallel to the urethane foam flow direction. is there.

  In addition, when the spacer shape shown in FIG. 3 is used on the side surface, generally, the shape of the heat radiating pipe 5 for the refrigerant is restricted. However, in the refrigerator according to the embodiment of the present invention, as shown in FIGS. 6 and 10, the spacer 60 is constituted by a rectangular wave plate 6 having a pipe relief shape (lower space portion of the top surface 6 a of the mountain portion). Therefore, the vacuum heat insulating material 3 can be mounted without changing the shape of the heat radiating pipe 5. And in this way, in the refrigerator which concerns on embodiment of this invention by arrange | positioning the thermal radiation pipe 5 in the lower space part of the top surface 6a of a mountain part, in the clearance gap between the thermal radiation pipe 5 and the vacuum heat insulating material 3. Can also flow the urethane foam 4, and the flow during foaming of the urethane foam is performed smoothly.

  In addition, by mounting the spacer 60 having such a urethane foam flow path and a heat radiating pipe escape shape, in the refrigerator according to the embodiment of the present invention, the heat conduction portion of the spacer 60 is reduced and the heat insulation performance is deteriorated. Can be suppressed. That is, a foamed resin such as urethane foam is less likely to conduct heat than an ABS synthetic resin. The spacer 60 shown in FIGS. 6 and 10 has a valley in the direction of the side plate 12 of the outer box 1 in a state where the top surface 6a of the peak portion is in close contact with the vacuum heat insulating material 3 so as to be parallel to the foaming direction of the urethane foam. The bottom surface of the portion 6b is protruded, and the bottom surface of the valley portion 6b is brought into close contact with the side plate 12 of the outer box 1 to support the vacuum heat insulating material 3. Furthermore, the spacer 60 is disposed in the lower space portion of the top surface 6a of the mountain portion so that the heat radiating pipe 5 is in close contact with the outer box 1. Thereby, the spacer 60 can provide a space between the heat radiating pipe 5 and the vacuum heat insulating material 3, and the space can be filled with the foaming agent. And after urethane foam foaming, it can be set as the firm structure which urethane foam fixes the spacer 60 whole reliably.

  In addition, a hole 6c serving as a flow path when foaming urethane foam is formed in each connection surface that connects the top surface 6a of each peak portion of the rectangular wave plate and the lower surface of each valley portion 6b. Thereby, the spacer 60 can be made into the structure which supports the top surface 6a of a peak part in the four corners from the trough part 6b side, and can reduce the obstacle with respect to the flow of a foaming agent.

  Next, the arrangement of the heat radiating pipe will be described with reference to FIG. FIG. 7 is a side sectional view and a rear sectional view showing the refrigerator according to the embodiment of the present invention. In the outer box 1 of the refrigerator, a vacuum heat insulating material 3 and a heat radiation pipe 5 of the refrigerant circuit are attached. In the inner box 2, a refrigerator compartment 7, a vegetable compartment 8, an ice making compartment 9, and a freezer compartment 10 are arranged partitioned from top to bottom. The refrigerator compartment 7 and the vegetable compartment 8 are set to a temperature range of 0 ° C. or higher. On the other hand, the ice making chamber 9 and the freezing chamber 10 are set to a temperature range of 0 ° C. or less. Here, the vacuum heat insulating material 3 is arranged on the back wall of the storage room set to a temperature zone of 0 ° C. or lower, and the heat radiating pipe 5 is gathered on the back wall of the storage room set to a temperature zone of 0 ° C. or higher. Arranged. Thereby, the refrigerator which concerns on embodiment of this invention has strengthened the heat insulation capability of the ice making chamber 9 and the freezer compartment 10 which needs to suppress the temperature rise in a store | warehouse | chamber. On the other hand, if the temperature is 0 ° C. or lower, a problem such as freezing occurs. On the wall surfaces of the refrigerator compartment 7 and the vegetable compartment 8, it is possible to keep the internal temperature appropriately by installing the heat radiating pipe 5. In addition, the vacuum heat insulating material 3 is provided so that the circumference | surroundings of the warehouse set to the temperature range below 0 degreeC may be surrounded here. The vacuum heat insulating material 3 is formed as being fixed to the outer box 1. However, the vacuum heat insulating material 3 is fixed to the inner wall surface of the outer box 1 or the inner box 2 via a spacer 60 as shown in FIG. 3, and the vacuum heat insulating material 3 is embedded by urethane foam that is injected and foamed. Of course, it is possible to do so. With this configuration, in the storage room set in the refrigeration temperature zone (temperature zone of 0 ° C. or lower), the space can be increased and can be used effectively. Furthermore, in this structure, after ensuring the heat insulation efficiency, the coverage of the vacuum heat insulating material 3 can be less than 50% with respect to the surface area of the outer box 1, and it can be set as an economical refrigerator.

  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 5 and releases high-temperature heat to the outside through the metal of the outer box 1. Therefore, the storage room at a position facing the heat radiating pipe 5 is affected by a relatively high temperature. When the vegetable freeze prevention heater 11 of the vegetable compartment 8 in FIG. 7 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 is affected by the heat radiating pipe 5. Due to the tendency to increase, the energization rate of the heater is reduced, and the effect of reducing the power consumption can be obtained by the decrease in the heater energization rate. The vacuum heat insulating material 3 is preferably disposed at a portion different from the portion where the heat radiating pipe 5 is provided because the temperature should be lower from the viewpoint of life and heat insulating efficiency, but the temperature difference from the surrounding outside air is particularly large at 0 ° C. or less. It is good to use as a heat insulating material surrounding the set room. In particular, the vacuum heat insulating material 3 is effective when used to insulate the freezer compartment around the freezing room maintaining a low temperature of −18 ° C. or less from the outside air and other storage rooms so as to reduce the influence on a refrigerator having a large temperature difference. It is. At this time, when the portion where the heat radiating pipe 5 is disposed and the portion where the vacuum heat insulating material 3 is disposed around the freezer compartment, the joint portion of the heat radiating pipe 5 is arranged so as to take a path not contacting the vacuum heat insulating material 3. Deploy. If the path of the heat radiating pipe 5 intersects with the position where the vacuum heat insulating material 3 is disposed, a storage room for cooling at 0 ° C. or lower, particularly a freezing room, may be disposed at the top.

  Next, another example of the arrangement of the heat radiating pipes will be described with reference to FIG. FIG. 8 is a side sectional view and a rear sectional view showing a refrigerator according to an embodiment of the present invention. The vacuum heat insulating material 3 is attached to the outer box 1 or the inner box 2 of the refrigerator, and the heat radiation pipe 5 of the refrigerant circuit is attached to the outer box. The refrigerator is provided with a refrigerator room 7, a vegetable room 8, an ice making room 9, and a freezer room 10 from above. The internal temperature of the refrigerator compartment 7 and the vegetable compartment 8 is 0 degreeC or more. The heat insulation thickness d7 of the wall section is 20 to 40% thinner than the heat insulation thickness d8 of the warehouse room set to 0 ° C. or less like the ice making room 9 or the freezing room 10, and the heat insulation structure is made thin. Yes. 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 heat insulation thickness d7, the vacuum heat insulating material 3 is fixed to the outer box 1, and urethane resin is foamed on the inner box side to obtain the thickness of the heat insulating wall formed from the inner box and the outer box. . On the other hand, the lower heat insulation thickness d8 is formed from the inner box and the outer box by radiating the urethane pipe between the inner box and the outer box by fixing the heat radiating pipe 5 to the outer box 1 without the vacuum heat insulating material 3. The thickness of the insulation wall is obtained. It should be noted that a spacer 60 as shown in FIG. 3 is used, this spacer 60 is disposed between the outer box 1 and the vacuum heat insulating material 3, and the vacuum heat insulating material 3 is buried by urethane foam which is injected and foamed. Of course, it is okay. In this case, the heat radiating pipe 5 is gathered upward, and the pipe connected to the heat radiating pipe 5 can be easily arranged by separating the heat radiating pipe 5 and the vacuum heat insulating material 3 by using the spacer 60 described above. Can do.

  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 storage room 7 having a low heat insulation capacity. Mount. At this time, since the heat radiation pipe 5 should have a lower temperature from the viewpoint of the life of the vacuum heat insulating material 3 and the heat insulating efficiency, a path that does not contact the vacuum heat insulating material 3 is taken. With this configuration, a refrigerated space such as the refrigerator compartment 7 can be used effectively. Moreover, since the minimum required vacuum heat insulating material 3 is used and the heat radiating pipe 5 can be shortened, an economical refrigerator can be manufactured. In other words, with this configuration, an economical refrigerator can be obtained in which the insulation rate of the vacuum heat insulating material 3 is less than 50% with respect to the surface area of the outer box while ensuring heat insulation efficiency.

  In the refrigerator according to the embodiment of the present invention, as described with reference to FIG. 1, the urethane foam stock solution is supplied from the inlet 16 provided on the back of the refrigerator product that faces upward, with the refrigerator product front (door side) facing downward. inject. Further, in the refrigerator according to the embodiment of the present invention, the foaming of the urethane foam starts when the injection of the urethane foam stock solution is completed, and the urethane foams while flowing in the direction of the arrow as described 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. That is, when the vacuum heat insulating material 3 is embedded between the inner box 2 and the outer box 1 on the side plate 12 of the refrigerator, the viscosity of the urethane foam is high when it is mounted near the back surface. There is a high possibility that foaming defects will occur.

  On the other hand, the refrigerator according to the embodiment of the present invention includes the urethane foam 4 and the vacuum heat insulating material 3 between the outer box 1 and the inner box 2, and the vacuum heat insulating material 3 does not contact the outer box 1 and the inner box 2. The vacuum heat insulating material 3 is installed between the heat radiating pipe 5 and the inner box 2, and the arrangement relationship of the vacuum heat insulating material 3, the inner box 2, and the outer box 1 according to the change in viscosity when urethane foam is foamed. Therefore, good quality heat insulation performance can be obtained. As a result, the refrigerator according to the embodiment of the present invention can maintain the conventional length and heat radiation shape of the heat radiating pipe 5 even when the vacuum heat insulating material 3 is mounted. It becomes possible to increase. Moreover, the refrigerator which concerns on embodiment of this invention suppresses the raise of the temperature of the vacuum heat insulating material 3 by interposing the urethane foam 4 between the heat radiating pipe 5 and the vacuum heat insulating material 3, and the vacuum heat insulating material 3 The heat insulation ability can be maintained, and the aging deterioration of the vacuum heat insulating material 3 can be suppressed.

  For example, in the refrigerator according to the embodiment of the present invention, when the vacuum heat insulating material 3 is installed above the dimension position within about 7% of the product depth dimension from the front end of the refrigerator, which is the lower part when injecting and foaming urethane foam, When the foam is injected and foamed, it is possible to secure the minimum gap that can ensure the maximum heat insulation performance. On the other hand, if the vacuum heat insulating material 3 is set at a distance that exceeds 17% of the product depth dimension from the front edge of the refrigerator, the viscosity becomes high and may cause quality defects such as air voids generated when urethane foam is foamed. There is. That is, when a dimension position within about 7% of the product depth dimension is selected from the front end of the refrigerator, the minimum clearances d1 and d2 (FIG. 5) between the outer box 1 and the inner box 2 are set to about 10 mm, for example. The minimum value that can be secured. In addition, when there is sufficient heat insulation performance and the vacuum heat insulating material 3 is installed above this position, that is, away from the front end of the refrigerator, the position where the viscosity of urethane foam is not too high, that is, urethane foam It is necessary to be closer to the end face than the dimension position exceeding 17% of the product depth dimension from the front face end part of the refrigerator which does not cause quality defects such as air voids when firing. In the refrigerator according to the embodiment of the present invention, the vacuum heat insulating material 3 is set in a dimension position that does not exceed 17% of the product depth dimension from the front end of the refrigerator. Even if it fills by injection foaming of a urethane foam reliably, the refrigerator which can obtain the desired quality which can ensure heat insulation performance can be manufactured.

  Thus, according to the refrigerator according to the embodiment of the present invention, the vacuum heat insulating material 3 approaches the front end of the refrigerator, so that after the urethane foam stock solution is injected, the liquid urethane foam is in a low viscosity state with a low viscosity. 3 neighborhoods can be passed. For this reason, according to the refrigerator which concerns on embodiment of this invention, even if the clearance of the vacuum heat insulating material 3, the outer box 1, and the inner box 2 is small, foaming is possible without a problem, and it is required for a flow in a position with high viscosity. Secure clearance.

  Moreover, in the refrigerator which concerns on embodiment of this invention, the urethane foam 4 and the vacuum heat insulating material 3 are arrange | positioned between the outer box 1 and the inner box 2, and the state which does not contact the vacuum heat insulating material 3 with the outer box 1 and the inner box 2 When burying in, if the clearance between the vacuum heat insulating material 3 and the outer box 1 and the inner box 2 is equally divided into about 1/3, respectively, effective heat insulating performance can be obtained. Both clearances may be secured to 1/3 or more of the wall surface insulation thickness of the refrigerator.

  For example, when foaming urethane foam at the time of manufacturing a refrigerator, the clearance with the vacuum heat insulating material 3 is set to about 1/3 of the heat insulating thickness of the refrigerator wall surface, so that the side heat insulating thickness of the refrigerator is about 30 mm and the vacuum heat insulating material is about 10 mm. In this case, the vacuum heat insulating material 3 is buried in the center of the outer box 1 and the inner box 2, and the urethane foam flow passage areas on both sides of the vacuum heat insulating material 3 are equal. It is possible to prevent the urethane flow from being hindered due to deformation of the vacuum heat insulating material 3 due to imbalance in pressure applied to the heat insulating material 3, and avoid problems such as a decrease in box strength due to urethane foam voids and defective exteriors. And the vacuum heat insulating material 3 can ensure thickness of about 10 mm, and can ensure reliable heat insulation performance.

  Furthermore, in the refrigerator according to the embodiment of the present invention, the urethane foam 4 and the vacuum heat insulating material 3 are provided between the outer box 1 and the inner box 2, and the vacuum heat insulating material 3 is not in contact with the outer box 1 and the inner box 2. When embedded in a state, a spacer 60 composed of a rectangular wave plate 6 having a flow path through which air and urethane foam can pass in both the urethane foam foaming direction and the direction intersecting the foaming direction when foaming the urethane foam is mounted. ing. Thus, in the refrigerator according to the embodiment of the present invention, the urethane foam flow is obstructed by the spacer 60 because the spacer 60 itself supporting the vacuum heat insulating material 3 has the urethane foam flow path shape. Disappear. Furthermore, in the refrigerator according to the embodiment of the present invention, since air can pass through the urethane foam flow path shape portion provided in the spacer 60, air lock can be prevented and foaming can be performed without hindering the flow of the urethane foam. Therefore, problems such as a drop in box strength due to urethane foam voids and defective exterior can be avoided.

  In addition, in the case of a simple block-shaped spacer, it is conceivable that the heat insulation performance is deteriorated by the heat conduction of the spacer itself. However, in the spacer 60 provided with a urethane foam flow path by a cavity, the urethane foam 4 is integrated with the spacer 60. Thus, a part of the spacer 60 is formed, so that the thermal resistance is increased and the heat conduction from the spacer 60 to the interior can be suppressed.

  According to the spacer 60 provided with the urethane foam flow path, the heat conduction from the spacer 60 and the unfilled problem of the urethane foam 4 are solved. Further, on the top surface 6a of each mountain portion of the rectangular wave plate 6, The number and size of the spacers 60 can be reduced by forming the extended portions 6d extending a predetermined amount (for example, 50 mm) on the sides. Thereby, in the refrigerator which concerns on embodiment of this invention, the flow resistance at the time of urethane foam foaming can be made small, the problem of a box strength fall and exterior defect can be avoided, and also it leads to the fall of product cost.

  Moreover, when the refrigerator according to the embodiment of the present invention mounts the vacuum heat insulating material 3 on the back of the refrigerator, the heat insulating thickness is mounted on a portion where the average heat insulating thickness is less than the refrigerator average heat insulating thickness. The heat-dissipating pipes 5 are collectively installed. For this reason, in the refrigerator according to the embodiment of the present invention, it is possible to improve the heat insulation ability of the portion where the heat insulation thickness on the back of the refrigerator is thin, and to prevent the heat intrusion from the location where the heat insulation thickness is thick. Is obtained.

  Moreover, in the refrigerator according to the embodiment of the present invention, when the vacuum heat insulating material 3 is mounted on the back of the refrigerator, the vacuum heat insulating material is mounted on the wall surface of the storage room where the internal temperature is set to 0 ° C. or lower, It is also possible to adopt a configuration in which the heat radiating pipes 5 are gathered and installed in a place where the vacuum heat insulating material is not mounted. A vacuum heat insulating material is mounted on the wall surface of the refrigerator compartment where the temperature in the refrigerator is set to 0 ° C or lower, reducing the amount of heat intrusion into the refrigerator, and the temperature in the refrigerator is set to 0 ° C or higher. By integrating the heat radiating pipes 5 on the wall surface of the storage room, it is possible to efficiently maintain the internal temperature of the storage room set to 0 ° C. or lower.

  The refrigerator which concerns on embodiment of this invention has installed the comb-shaped or U-shaped heat radiating pipe 5 in the refrigerator product up-down direction like FIG.4, FIG.7 and FIG.8. Thus, by installing the comb-shaped or U-shaped radiating pipe 5 in the vertical direction of the refrigerator, in the refrigerator according to the embodiment of the present invention, it is easy to ensure the extension distance of the pipe, and the radiating pipe 5 The folded portion can be reduced while maintaining the length. For this reason, in the refrigerator which concerns on embodiment of this invention, processing cost can be reduced and it becomes possible to provide an inexpensive refrigerator.

  According to the refrigerator according to the embodiment of the present invention, since the foamed urethane foam passes through the vicinity of the vacuum heat insulating material in a low viscosity state, heat insulation due to poor exterior of the refrigerator due to poor fluidity and poor urethane foam heat insulating material. The vacuum heat insulating material 3 can be mounted without causing deterioration in performance. Moreover, according to the refrigerator which concerns on embodiment of this invention, since the heat-dissipation pipe 5 of a refrigerator can be mounted similarly to the conventional refrigerator by mounting the vacuum heat insulating material 3 in the position which floated from the outer case 1, it has condensation capacity. Without lowering, it is possible to improve the heat insulating ability by mounting the vacuum heat insulating material, and to manufacture a refrigerator that achieves both improved cooling capacity and reduced power consumption.

  As described above, according to the refrigerator according to the embodiment of the present invention, even when the vacuum heat insulating material 3 is mounted, the heat radiating pipe 5 can maintain the conventional length and heat radiating shape, so that there is no harmful effect of reducing the condensation capacity. It becomes possible to improve the heat insulation capacity. Moreover, according to the refrigerator which concerns on embodiment of this invention, the temperature of the vacuum heat insulating material 3 suppresses a raise by the urethane foam 4 interposing between the heat radiating pipe 5 and the vacuum heat insulating material 3, and a vacuum heat insulating material. 3 can be maintained, and aged deterioration of the vacuum heat insulating material 3 can be suppressed.

  Moreover, according to the refrigerator which concerns on embodiment of this invention, since urethane foam passes the vacuum heat insulating material vicinity in a state with a low viscosity at the time of urethane foam foaming of a refrigerator, the vacuum heat insulating material 3, the outer box 1, and the inner box 2 Even if the clearance is small, foaming is possible without any problem.

  Moreover, according to the refrigerator which concerns on embodiment of this invention, the flow with urethane foam is inhibited by ensuring clearance with the vacuum heat insulating material 3 at 1/3 or more of the wall surface insulation thickness of a refrigerator at the time of urethane foam foaming. Foaming is possible, and problems such as a drop in box strength due to urethane foam voids and defective exteriors can be avoided.

  Moreover, according to the refrigerator which concerns on embodiment of this invention, since the urethane foam flow path shape is given to the spacer 60 itself which supports the vacuum heat insulating material 3, urethane foam fluidity | liquidity can be ensured and the flow of urethane foam is inhibited. Foaming is possible without doing so. In addition, the spacer 60 is constituted by the rectangular wave plate 6, and the rectangular wave plate 6 is formed with an extended portion 6 d that extends a predetermined amount (for example, 50 mm) on the top surface 6 a of each peak portion thereof. Therefore, only the contact area part with the vacuum heat insulating material 3 in the spacer 60 can be increased toward the side. For this reason, according to the refrigerator which concerns on embodiment of this invention, the number of spacers can be reduced, suppressing generation | occurrence | production of the bending of a vacuum heat insulating material. Furthermore, according to the refrigerator according to the embodiment of the present invention, it is possible to reduce the resistance to urethane foam flow, so problems such as a drop in strength of the box due to urethane foam voids and defective exteriors can be avoided. Moreover, according to the refrigerator which concerns on embodiment of this invention, since the quantity of a spacer can be reduced, the unit price for the reduced spacer and the cost of an assembly man-hour can be suppressed. In addition, in a simple block-shaped spacer, it is conceivable that the heat insulation performance deteriorates due to the heat conduction of the spacer itself, but in the spacer provided with the urethane foam channel like the refrigerator according to the embodiment of the present invention, the thermal resistance Becomes larger, and heat conduction from the spacer to the interior can be suppressed.

  Moreover, according to the refrigerator which concerns on embodiment of this invention, since the heat radiating pipe 5 is formed in the comb shape or U shape in the up-down direction of the refrigerator, even when the vacuum heat insulating material 3 is mounted, the heat radiating pipe 5 The folded portion can be reduced while maintaining the length. For this reason, according to the refrigerator which concerns on embodiment of this invention, processing cost can be suppressed and an inexpensive refrigerator can be provided. Moreover, according to the refrigerator which concerns on embodiment of this invention, the temperature of the vacuum heat insulating material 3 suppresses a raise, and the heat insulation capability of the vacuum heat insulating material 3 can be maintained. Moreover, according to the refrigerator which concerns on embodiment of this invention, it becomes possible to suppress aged deterioration of the vacuum heat insulating material 3. FIG.

  Moreover, according to the refrigerator which concerns on embodiment of this invention, the vacuum insulation material 3 is mounted in the site | part with a thin heat insulation thickness of the refrigerator back surface, and a heat insulation capability is improved, On the other hand, a site | part with a high heat insulation capability with a thick heat insulation thickness Since it is installed in the heat radiating pipe 5, the effect of preventing heat intrusion into the cabinet can be obtained.

  Moreover, according to the refrigerator which concerns on embodiment of this invention, the vacuum heat insulating material 3 is mounted in the wall surface of the store room in which the temperature in a refrigerator store | warehouse | chamber is set to 0 degrees C or less, and the amount of heat | fever penetration | invasion into a store | warehouse | chamber is reduced. In addition, by integrating the heat radiation pipes on the wall surface of the refrigerator compartment where the temperature in the refrigerator compartment is set to 0 ° C or higher, it is possible to efficiently maintain the temperature in the refrigerator compartment set to 0 ° C or lower. It becomes.

  Thus, according to the refrigerator which concerns on embodiment of this invention, since only the contact area part with the vacuum heat insulating material 3 in the spacer 60 can be increased toward a side, generation | occurrence | production of the bending of a vacuum heat insulating material is suppressed. However, the number of spacers can be reduced. Moreover, according to the refrigerator which concerns on embodiment of this invention, even when the vacuum heat insulating material 3 is mounted, the refrigerator which can raise the heat insulation capacity without the harmful effect which reduces a condensation capacity is obtained. Moreover, according to the refrigerator which concerns on embodiment of this invention, the temperature rise of the vacuum heat insulating material 3 is suppressed by interposing the urethane foam 4 between the heat radiating pipe 5 and the vacuum heat insulating material 3, and a vacuum heat insulating material is used. The heat insulation capability can be maintained, the deterioration of the vacuum heat insulating material 3 over time can be suppressed, and a high-quality refrigerator can be obtained at low cost.

  DESCRIPTION OF SYMBOLS 1 Outer box, 2 Inner box, 3 Vacuum heat insulating material, 4 Urethane foam, 5 Heat radiating pipe, 6 Rectangular wave type plate, 6a Top surface of a mountain part, 6b Valley part, 6c hole, 6d Extension part, 7 Cold room, 8 Vegetable room, 9 ice making room, 10 freezing room, 11 vegetable freeze prevention heater, 12 side plate, 13 rear plate, 14 top plate, 15 bottom plate, 16 inlet, 60 spacer, d1 minimum clearance, d2 minimum clearance, d3 clearance, d4 Spacer width, d5 short side, d6 clearance, d7 heat insulation thickness, d8 heat insulation thickness.

Claims (12)

Between the outer box and the inner box, it has a box comprising a spacer, a vacuum heat insulating material supported by the spacer, and a urethane foam filled and injected so as to embed the vacuum heat insulating material. In the refrigerator
The spacer is constituted by a rectangular wave plate, the top surface of each crest of the rectangular wave plate is a receiving part for the vacuum heat insulating material, and the lower surface of each trough of the rectangular wave plate is the outer box Alternatively, the refrigerator is provided with a contact portion with the inner box, and further provided with an extension portion extending a predetermined amount laterally on the top surface of each peak portion of the rectangular wave plate.   2. The refrigerator according to claim 1, wherein the extended portion of the top surface of each peak portion of the rectangular wave plate is formed in a zigzag shape extending in an opposite direction between adjacent peak portions.   The refrigerator according to claim 1, wherein the extended portion of the top surface of each peak portion of the rectangular wave plate is formed on both sides of each peak portion.   The refrigerator according to claim 1, wherein the extension portion of the top surface of each peak portion of the rectangular wave plate is formed on one side of each peak portion. Further equipped with a heat radiating pipe,
The outer casing is fixed so that the heat radiating pipes are juxtaposed in a direction intersecting with the urethane foaming direction, and the spacer is formed on the lower space portion of the top surface of each peak portion of the rectangular wave plate. The heat dissipating pipes are arranged so as to cross each other, and urethane foam is also filled between the top surfaces of the crests of the rectangular wave plates and the heat dissipating pipes. Item 5. The refrigerator according to any one of Items 4.   Between the outer box and the inner box in which the vacuum heat insulating material is installed, the vacuum heat insulating material is at an intermediate position between the outer box and the inner box in a portion where the gap through which urethane foam flows is the thinnest. The refrigerator according to any one of claims 1 to 5, wherein the refrigerator is arranged.   The urethane foam injection port is provided on the back side of the outer box, and the vacuum heat insulating material is installed on the back side from a position a predetermined distance in the depth direction from the front end of the outer box. The refrigerator according to any one of claims 1 to 6.   The refrigerator according to any one of claims 1 to 7, wherein a clearance between the vacuum heat insulating material and the outer box and the inner box is set to approximately 1/3 of a wall surface insulation thickness. Further equipped with a heat radiating pipe,
When the vacuum heat insulating material is mounted on the back of the box, the vacuum heat insulating material is mounted at a position corresponding to the wall surface of the storage room where the internal temperature is set to 0 ° C. or lower, while the vacuum heat insulating material is not mounted. 9. The heat radiation pipes are gathered together, and the heat insulation wall thickness is made thicker from the position where the heat radiation pipes are gathered than the position where the vacuum heat insulating material is mounted. Refrigerator. Further equipped with a heat radiating pipe,
When mounting the vacuum heat insulating material on the back surface of the box, 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 box average heat insulating thickness, while the vacuum heat insulating 9. The heat-dissipating wall thickness is made thicker at a position where the heat-dissipating pipes are concentrated than a position where the vacuum heat-insulating material is mounted by consolidating the heat-dissipating pipes at a location where no material is mounted. The refrigerator in any one of.   The refrigerator according to any one of claims 5 to 10, wherein the heat radiating pipe is a pipe that repeats a comb-shaped or U-shaped pattern in the vertical direction of the refrigerator.   The refrigerator according to any one of claims 1 to 11, wherein the urethane foam is foamed in a state in which the back surface of the box is facing upward.

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