WO2016162955A1

WO2016162955A1 - Vacuum insulation material, and refrigerator

Info

Publication number: WO2016162955A1
Application number: PCT/JP2015/060865
Authority: WO
Inventors: 努小高; 祥花岡; 章弘難波; 俊齋藤; 浩明高井
Original assignee: 三菱電機株式会社
Priority date: 2015-04-07
Filing date: 2015-04-07
Publication date: 2016-10-13
Also published as: CN106052251A; CN106052251B; TW201708778A; WO2016163250A1; TWI606220B

Abstract

Provided is a vacuum insulation material which does not increase costs and the number of production steps, while ensuring original insulation performance. A vacuum insulation material according to the present invention is provided with: a core material (26); and an outer packaging material (25) which covers the core material (26) in a reduced pressure state. The vacuum insulation material (23), which is formed into a plate shape, has, provided in one surface side (the side of an inner box (31)) of the plate shape, grooves (36) which are used as flow paths when loading a foam insulation material (19).

Description

Vacuum insulation and refrigerator

The present invention relates to a vacuum heat insulating material and a refrigerator incorporating the vacuum heat insulating material.

Conventionally, as a vacuum heat insulating material (panel), for example, there is one proposed in Japanese Patent No. 3478780 (Patent Document 1). The vacuum heat insulating material proposed in Patent Document 1 includes a core material obtained by molding a fiber material and an outer cover material that covers the core material and depressurizes the inside. Although the vacuum heat insulating material of patent document 1 is provided with the groove | channel for bending the said vacuum heat insulating material, there is no description with respect to filling of a foam heat insulating material (urethane foam). In order to ensure the heat insulating performance of the refrigerator, the vacuum heat insulating material is installed in a space where the urethane foam stock solution is foamed, so that the space in which the urethane foam stock solution is foamed and flows is narrowed by the vacuum heat insulating material. For this reason, in order to fill the urethane foam without filling, it is necessary to limit the thickness of the vacuum heat insulating material.

By the way, a vacuum heat insulating material having a thickness of 10 to 30 mm is generally used. If the vacuum heat insulating material having such a thickness is arranged inside the heat insulating wall of the refrigerator main body, there may be a case where a necessary corresponding gap cannot be secured when the raw material mixture of urethane foam is injected. In such a case, the injected liquid adheres to the wall surface and foams, and then blocks the flow path of the fluid foam filled in the heat insulating wall. As a result, the urethane foam needs to be filled in an excessive amount, or in some cases, the unfilled voids remain, thereby deteriorating the heat insulation performance or the appearance design. It will come. Moreover, the backflow from the injection port occurs due to the deterioration of the fluidity in the vicinity of the injection port of the urethane foam, which causes problems such as a decrease in mass productivity.

In order to cope with such problems, it is necessary to prevent the injection position and direction of the urethane foam from interfering with the arrangement position of the vacuum heat insulating material (panel), or the position of the liquid pool accompanying the original injection. It is necessary to take measures such as providing an inlet for the raw material mixture of urethane foam. For example, in Japanese Patent Application Laid-Open No. 64-14584 (Patent Document 2) and Japanese Patent Application Laid-Open No. 5-288461 (Patent Document 3), urethane foam discharged from an inlet provided on the back of a refrigerator main body (heat insulating box) is disclosed. The thing which arrange | positioned the vacuum heat insulating material in the position which does not interfere with foam heat insulating materials, such as, is proposed. In JP-A-8-61837 (Patent Document 4), a liquid reservoir of a desired foamed urethane raw material mixture is prevented so that the foamed thermal insulation material mixture discharged from the inlet does not interfere with the vacuum heat insulating material. There has been proposed one in which an inlet is provided at a position and the flow path is branched.

Japanese Patent No. 3478780 Japanese Patent Laid-Open No. 64-14584 Japanese Patent Application Laid-Open No. 5-288461 JP-A-8-61837

However, according to the vacuum heat insulating materials proposed in Patent Documents 2 to 4, it is necessary to take measures such as dividing or eliminating the position of the vacuum heat insulating material. For this reason, due to the reduced arrangement area of the vacuum heat insulating material, it becomes difficult to ensure the original heat insulating performance, or more vacuum heat insulating materials than the original number of arrangements are required along with the division, This causes problems such as an increase in manufacturing man-hours and costs.

The present invention has been made to solve the above-described problems, and provides a vacuum heat insulating material that does not increase the number of manufacturing steps and costs while ensuring the original heat insulating performance. Objective.

The vacuum heat insulating material according to the present invention includes a core material and an outer packaging material that covers the core material in a decompressed state. In the vacuum heat insulating material formed in a plate shape, foam is formed on one surface side of the plate shape. The first groove portion used as a flow path when filling the heat insulating material is provided.

According to the vacuum heat insulating material according to the present invention, it is not necessary to divide and arrange the vacuum heat insulating material as in the prior art by providing the vacuum heat insulating material with a groove for flowing foam heat insulating material (for example, urethane foam). There is no restriction on the position of the vacuum heat insulating material. Moreover, even if the thickness of the vacuum heat insulating material in the heat insulating wall is increased in order to improve the heat insulating performance and the flow path of the foam heat insulating material (urethane foam) is narrowed as a whole, the foam heat insulating material (urethane foam) can be filled. . For this reason, the vacuum heat insulating material which does not cause the increase in a manufacturing man-hour and cost can be provided.

It is the perspective view which looked at the refrigerator which concerns on Embodiment 1 of this invention from diagonally forward. FIG. 3 is a cross-sectional view taken along the line BB in FIG. It is a perspective view from the back side of the refrigerator of FIG. FIG. 2 is a cross-sectional view taken along the line CC of FIG. It is an enlarged view of the A section of FIG. It is explanatory drawing of the state which attached the heat radiating pipe and the vacuum heat insulating material to the side plate of the refrigerator of FIG. FIG. 7 is a DD cross-sectional view of FIG. 6. It is explanatory drawing of the shape of a vacuum heat insulating material, (a) is a front view, (b) is a top view, (c) is a side view. It is explanatory drawing of the manufacturing process of the vacuum heat insulating material of FIG. 8, (a) is explanatory drawing of a laminated body, (b) is explanatory drawing of an outer packaging material, (c) is explanatory drawing of press work, (d) is press It is explanatory drawing of the shape of the vacuum heat insulating material after a process. (A) and (b) are the figures which showed the modification of the groove part, respectively. It is explanatory drawing which showed the positional relationship of the foaming material injection | pouring head at the time of filling a urethane foam in a refrigerator, and a vacuum heat insulating material. FIG. 12 is a cross-sectional view taken along line EE in FIG. 11.

Embodiment 1 FIG.
FIG. 1 is an inclined view of the refrigerator according to the first embodiment of the present invention as viewed obliquely from the front. The refrigerator 1 includes a front opening that is open on the front side, and stores a refrigerator main body 30 that stores a refrigerated (10 ° C. or lower) or frozen (−12 ° C. or lower) storage such as food, and a front opening of the refrigerator main body 30. And a plurality of doors 7 to 12 for opening and closing the door. The refrigerator main body 30 has the refrigerator compartment 2, the ice making room 3, the 1st freezer compartment 4, the 2nd freezer compartment 5, and the vegetable compartment from the top inside.

Doors

7, 8, 9, 10, 11, and 12 are provided in front opening portions of the refrigerator compartment 2, the ice making chamber 3, the first freezer compartment 4, the second freezer compartment 5, and the vegetable compartment 6, respectively. .

Refrigerating

room doors

7 and 8 are open / close doors for opening and closing the refrigerating room 2 and are composed of two doors of a double door type. The

freezer compartment doors

9, 10, and 11 are doors for opening and closing the ice making chamber 3, the first freezer compartment 4, and the second freezer compartment 5, respectively, and three independent drawer doors, that is, the ice making compartment door 9, It consists of a first freezer compartment door 10 and a second freezer compartment door 11. The lowermost vegetable compartment door 12 is a door that opens and closes the vegetable compartment 6, and is composed of a drawer-type door. The drawer-type door is a door that is pulled out together with a storage case in which stored items are stored.

FIG. 2 is a cross-sectional view taken along the line BB in FIG. The refrigerator 1 includes a cooler 17, a compressor 18, a condenser (not shown), and a capillary tube (not shown). A refrigeration cycle is configured by the cooler 17, the compressor 18, the condenser, and the capillary tube. The cooler 17 and the compressor 18 are disposed on the back side of the refrigerator main body 30. The refrigerator main body 30 is composed of a heat insulating box and has an outer box 21 and an inner box 31. A vacuum heat insulating material 15 and a vacuum heat insulating material 23 (see FIG. 4) are attached to the inner wall of the outer box 21, and a space formed between the outer box 21 and the inner box 31 is filled with the foam heat insulating material 19. Yes. As the condenser, a heat radiating pipe 22 (see FIG. 4) through which the refrigerant compressed by the compressor 18 flows is used. Details of the heat radiating pipe 22 will be described later. Isobutane (R600a) is used as the refrigerant circulating in the refrigeration cycle. Other refrigerants may be used as the refrigerant, but isobutane has advantages such as not destroying the ozone layer when discarded and having a low global warming potential.

The cold air cooled by the cooler 17 of the refrigeration cycle is forcibly circulated to the refrigerator compartment 2, the ice making compartment 3, the first freezer compartment 4, the second freezer compartment 5, and the vegetable compartment 6 by the blower 16. The amount of cool air to each storage chamber is controlled by an electric open / close damper (not shown) provided in each air passage. Various controls such as the internal temperature of the refrigerator 1 and the rotation speed of the compressor 18 are controlled by a control board (control device) 14 provided on the upper rear side of the refrigerator body 30.

Next, the foaming method of the foam heat insulating material 19 (for example, urethane foam) in the refrigerator main body 30 of FIG. 1 is demonstrated using FIG.
FIG. 3 is a perspective view from the back side of the refrigerator 1 in FIG. 1. The outer box 21 of the refrigerator main body 30 includes a back plate 20, a side plate 32, a floor plate 35, and a top plate 35a. As shown in FIG. 3, when the urethane foam stock solution is injected into the interior of the refrigerator body 30, that is, the space between the outer box 21 and the inner box 31 (see FIG. 4), the back plate of the refrigerator body 30 The refrigerator main body 30 is set in a foaming apparatus (illustrated) so that 20 is positioned above. And the urethane foam undiluted | stock solution is inject | poured from the several foam heat insulating material injection port 33 (33a, 33b) provided in the backplate 20. FIG. The injected urethane foam undiluted solution wraps around the entire front edge side between the outer box 21 and the inner box 31 of the refrigerator main body 30, and then starts foaming toward the back plate 20. It fills so that the space of the refrigerator main body 30 comprised by may be filled. That is, the refrigerator main body 30 is configured by foaming and filling the space between the inner box 31 and the outer box 21 configured by partitioning each storage chamber. In addition, the vacuum

heat insulating materials

15 and 23 to be described later are temporarily fixed to the inner wall of the outer box 21 (the back plate 20 and the side plate 32) in advance by hot melt, a sealing material, etc. It is fixed inside the outer box 21 of the refrigerator main body 30 (foam insulation 19 side).

Next, the refrigerator main body 30 will be described in more detail.
4 is a cross-sectional view taken along the line CC in FIG. 1, and FIG. 5 is an enlarged view of a portion A in FIG. As shown in FIG. 4, the outer box 21 includes a back plate 20 and a side plate 32. The back plate 20 and the side plate 32 are made of iron plates with a thickness of about 0.4 to 0.5 mm. On the back plate 20 and the side plate 32, a heat radiating pipe 22 that plays the role of a condenser of the refrigeration cycle is fixed with an aluminum tape or the like at an interval (pitch) of W1 (however, the cross section of FIG. 4). In the position, the state where the heat radiating pipe 22 is fixed to the back plate 20 is not shown). The diameter of the heat radiating pipe 22 is about 4.0 to 5.0 mm. The heat radiating pipe 22 is attached to the inner wall of the back plate 20 or the side plate 32 constituting the outer box 21 of the refrigerator main body 30 and radiates heat.

The vacuum

heat insulating materials

15 and 23 are, for example, concave portions (depth 5 mm) larger than the diameter of the heat radiating pipe 22 so as not to contact the six continuous heat radiating pipes 22 and press the heat radiating pipe 22 against the back plate 20 and the side plate 32. 29). And the vacuum

heat insulating materials

15 and 23 attach the heat radiating pipe 22 attached to the back plate 20 and the side plate 32 at a certain interval (pitch) in the width direction or the front-rear direction of the refrigerator 1 in the groove portion 29 having a concave cross section. In the housed state, it is affixed to the side plate 32 and the back plate 20 using hot melt or adhesive tape.

The foam heat insulating material 19 is filled in a space formed between the outer box 21 and the inner box 31 after the heat radiating pipe 22 and the vacuum

heat insulating materials

15 and 23 are attached to the back plate 20 or the side plate 32. Therefore, attachment of the vacuum

heat insulating materials

15 and 23 to the back plate 20 and the side plate 32 is performed by the foam heat insulating material 19 between the back plate 20 and the vacuum heat insulating material 15 and between the side plate 32 and the vacuum heat insulating material 23. It is necessary to fix so as not to enter.

Further, as shown in FIG. 5, an R-bending portion 21 a (inner box locking portion) of the locking portion that locks the inner box 31 to the outer box 21 is provided on the front opening side of the refrigerator body 30. A box 21 is formed. The R bent portion 21a of the outer box 21 is elastically deformed and sandwiched with the locked portion 31a of the inner box 31, whereby the outer box 21 and the inner box 31 are engaged, and both are coupled.

FIG. 6 is a view showing a state in which the heat radiating pipe 22 and the vacuum heat insulating material 23 are attached to the side plate 32 of the refrigerator 1 of FIG. 1, and the heat radiating pipe 22 and the vacuum heat insulating material 23 attached to the side plate 32 are connected to the refrigerator 1. It is the front view seen from the outside. 7 is a cross-sectional view taken along the line DD of FIG. The vacuum heat insulating material 23 has the groove part 29 for accommodating the thermal radiation pipe 22 made, for example with the copper pipe of diameter 4.0mm etc. as mentioned above. The groove portion 29 will be described in more detail. The groove portion 29 is formed in a plurality of rows in the vertical direction of the vacuum heat insulating material 23 and with a center line interval of W1. The groove 29 has a concave shape (concave shape in cross section) having wall portions on both the left and right sides covering the heat radiating pipe 22, and the depth D1 is about 5 mm and the width L1 is 40 to 70 mm.

Further, the width dimension L1 of the groove portion 29 takes into account the assembly tolerance generated in the refrigerator manufacturing process. That is, the width dimension L1 of the groove portion 29 is a manufacturing error in forming the groove portion 29, an attachment error in attaching the vacuum heat insulating material 23 to the side plate 32, and the heat radiation pipe 22 is slightly bent on the plane of the side plate 32. In addition, even if an attachment error of the heat radiating pipe 22 to the side plate 32 occurs, the heat radiating pipe 22 can be accommodated.

Moreover, the depth dimension D1 of the groove part 29 is pressed outward in the order of the vacuum heat insulating material 23, the heat radiating pipe 22, and the side plate 32 by foaming of urethane foam. The outer packaging material 25 is designed to have a diameter equal to or greater than the diameter of the heat radiating pipe 22, for example, about 5.0 mm so as not to be damaged. If the depth dimension D1 of the groove 29 is less than the diameter of the heat radiating pipe 22, pressure is applied in the order of the vacuum heat insulating material 23, the heat radiating pipe 22, and the side plate 32 due to foaming of urethane foam. Since the shape of the heat radiating pipe 22 emerges, the appearance is poor.

In the above description, the heat radiating pipe 22 is arranged on the inner wall of the side plate 32 and the vacuum heat insulating material 23 is attached. However, the heat radiating pipe 22 is arranged on the inner wall of the back plate 20 and the vacuum heat insulating material 15 is attached. In the case of attachment, the same configuration is obtained.

FIG. 8 is an explanatory view of the shape of the vacuum heat insulating material 23, (a) is a front view, (b) is a plan view, and (c) is a side view. FIG. 8 is an explanatory diagram focusing on the groove 36 provided on the opposite surface of the groove 29. The groove portion 29 is provided on the outer box 21 side of the vacuum heat insulating material 23, but in the present embodiment, the groove portion 36 is also provided on the inner box 31 side of the vacuum heat insulating material 23. The groove 36 is provided in order to expand the flow path when the foam heat insulating material 19 is filled. The vacuum heat insulating material 23 (15) to which the groove portion 36 is to be attached is assumed to be all disposed in the refrigerator main body 30.

<Manufacturing method of vacuum heat insulating material>
Next, the manufacturing method of the vacuum heat insulating material 23 is demonstrated using FIG.
FIGS. 9A to 9D are cross-sectional views showing the manufacturing process including the process of housing the core material 26 of the vacuum heat insulating material 23 in the outer packaging material 25 over time. Hereinafter, a description will be given in time series according to FIGS. 9A to 9D.
(A) The laminate 24 is composed of three laminates 24a, 24b, and 24c (FIG. 9A). The laminated bodies 24a, 24b and 24c are generally made of natural fibers such as glass wool, glass fibers, alumina fibers, silica alumina fibers, and cotton. In the present invention, the number of stacked bodies 24a, 24b, and 24c is not limited to the above number.
(B) The core material 26 made of the laminate 24 is covered in a state where the pressure is reduced by the outer packaging material 25 made of a metal-deposited laminate film having a plastic layer for heat welding (FIG. 9B).

(C) A groove 29 is formed in the vacuum heat insulating material by compressing the vacuum heat insulating material in a state where the core material 26 is covered with the outer packaging material 25 with a press die 27 having a convex portion and a press die 27b. (FIG. 9 (c)). The groove portion 36 is also formed in the same manner as the groove portion 29. However, in the case of the groove portion 36, the shape (interval, depth, etc.) of the groove portion 29 is different from that of the groove portion 29. It is necessary to prepare the mold 27b separately. In addition, although the example processed separately with the groove part 29 and the groove part 36 is demonstrated here, the convex-shaped part for the groove part 29 and the convex-shaped part for the groove part 36 are provided in the press die 27 and the press die 27b. And the groove 29 and the groove 36 may be formed at the same time.
(D) As described above, the plate-like (panel-like) vacuum heat insulating material 23 shown in FIG. 9D is obtained. In addition, the depth of the

groove parts

29 and 36 shall be 1/2 or less of the thickness of the vacuum heat insulating material 23 in order to maintain heat insulation performance also about a groove-shaped location. Further, the cross-sectional shape of the

grooves

29 and 36 is not limited to a quadrangle, and may be a polygon such as an ellipse or a triangle. The vacuum heat insulating material 15 is also manufactured in the same manner as the vacuum heat insulating material 23.

10 (a) and 10 (b) are cross-sectional views showing modified examples of the

groove portions

29 and 36 described above. The groove 29b (36b) in FIG. 10A has a triangular cross section. The groove 29c (36c) in FIG. 10B has a semi-elliptical cross section. These grooves 29b (29c) and 36b (36c) also exhibit the same effects as in the above example.

Next, a process when filling the refrigerator with urethane foam as the foam insulation 19 will be described. FIG. 11 is an explanatory view showing the positional relationship between the foam injection head and the vacuum heat insulating material when filling the urethane foam in the refrigerator, and FIG. 12 is a cross-sectional view taken along the line EE of FIG. Note that FIG. 11 is illustrated with the refrigerator body 30 omitted. As shown in FIG. 11, the groove 36 of the vacuum heat insulating material 23 is disposed directly below the foam heat insulating material inlet 33 (see FIG. 3), and the urethane foam stock solution is supplied from the foam material injecting head 34 to the foam heat insulating material inlet 33. Is injected and filled into the refrigerator main body 30 through the groove 36 of the vacuum heat insulating material 23. At the time of filling, the groove portion 36 enlarges the flow path of the foam heat insulating material.

As described above, the vacuum heat insulating material 23 (15) according to the present embodiment includes the core core material 26 and the outer packaging material 25 that covers the core material 26 in a decompressed state, and is formed into a plate shape. On one surface side (inner box 31 side), a groove portion 36 (first groove portion of the present invention) used as a flow path when filling the foam heat insulating material 19 is provided. For this reason, it becomes possible to expand the flow path width of the foam heat insulating material 19 by locally spreading between the inner box 31 and the vacuum heat insulating material 23. By expanding the flow path width of the foam heat insulating material 19, it is not necessary to reduce the division and thickness of the vacuum heat insulating material for securing the flow path of the foam heat insulating material 19, and the heat insulating performance can be improved. Further, as an example, since the foam insulation 19 poured from the injection port 33 can easily flow by attaching the groove 36 directly below the foam insulation material injection port 33, the foam insulation 19 from the foam insulation material injection port 33. The occurrence of backflow is suppressed. Moreover, there is no need to divide and arrange the vacuum heat insulating material as in the prior art, and there is no restriction on the position of the vacuum heat insulating material. Further, even if the thickness of the vacuum heat insulating material 23 (15) in the heat insulating wall is increased to improve the heat insulating performance and the flow path of the foam heat insulating material 19 (urethane foam) is narrowed as a whole, the foamed heat insulating material 19 (urethane foam) Can be filled. For this reason, the vacuum heat insulating material which does not cause the increase in a manufacturing man-hour and cost can be provided.

Further, the groove 36 has a cross-sectional shape of a quadrangle, a circular arc, or a polygon, and can take various forms as necessary, so that the degree of freedom in design is increased.

Moreover, the vacuum heat insulating material 23 (15) was provided with the groove part 29 (2nd groove part of this invention) utilized as an escape groove | channel of the thermal radiation pipe 22 in the plate-like other surface side (outer box 21 side). Thus, it is possible to avoid forming a useless space between the vacuum heat insulating material 23 and the outer box 21. For this reason, a decrease in heat insulation performance can be avoided.

In addition, the refrigerator 1 according to the present embodiment includes a front opening that is open on the front side, and includes a refrigerator main body 30 that is a heat insulating box, and doors 7 to 12 that cover the front opening of the refrigerator main body 30 so that the front opening can be opened and closed. The refrigerator main body 30 includes an outer box 21 and an inner box 31, a vacuum heat insulating material 23 is attached to the inner wall of the outer box 21, and is a space formed by the outer box 21 and the inner box 31. The space excluding the heat insulating material 23 (15) is filled with the foam heat insulating material 19, and the vacuum heat insulating material 23 (15) having the above-described form is used. As a result, in the recent refrigerator market, it is desired to expand the internal capacity without changing the module, so the heat insulation thickness of the refrigerator tends to be thin, while the interest in energy saving performance is increasing. In order to meet the needs of the refrigerator, the thickness of the insulation of the refrigerator is reduced, but the thickness of the vacuum insulation is not changed, and the thickness of the foam insulation can be reduced. Is possible.

1 Refrigerator, 2 Refrigeration room, 3 Ice making room, 4 First freezing room, 5 Second freezing room, 6 Vegetable room, 7, 8 Cold room door, 9 Ice making room door, 10 First freezing room door, 11 Second freezing Room door, 12 Vegetable room door, 14 Control board, 15, 23 Vacuum insulation, 16 Blower, 17 Cooler, 18 Compressor, 19 Foam insulation, 20 Back plate, 21 Outer box, 21a R-bend, 22 Heat dissipation Pipe, 24, 24a-24c laminate, 25 outer packaging material, 26 core material, 27, 27b press mold, 29, 29b, 29c groove, 30 refrigerator main body, 31 inner box, 31a locked portion, 32 side plate, 33 33a, 33b Foam insulation inlet, 34 Foam injection head, 35 Floor plate, 35a Top plate, 36, 36b, 36c Groove.

Claims

In the vacuum heat insulating material provided with a core material and an outer packaging material that covers the core material in a decompressed state,
The vacuum heat insulating material provided with the 1st groove part utilized as a flow path at the time of filling the foam heat insulating material in the one surface side of the said plate shape.
The vacuum heat insulating material according to claim 1, wherein the first groove portion has a cross-sectional shape of a quadrangle, an arc, or a polygon.
The vacuum heat insulating material according to claim 1 or 2, further comprising a second groove portion used as an escape groove of the heat radiating pipe on the other surface side of the plate shape.
A refrigerator main body comprising a front opening having an opening on the front side and comprising a heat insulating box,
A door that covers the front opening of the refrigerator main body so as to be freely opened and closed;
With
The refrigerator body is
An outer box and an inner box,
A vacuum heat insulating material is attached to the inner wall of the outer box,
A space formed by the outer box and the inner box, the space excluding the vacuum heat insulating material is filled with foam heat insulating material,
A refrigerator in which the vacuum heat insulating material according to any one of claims 1 to 3 is used as the vacuum heat insulating material.