JP2014066442A - Door of constant-temperature storage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent door of a constant-temperature storage in which a glass plate is used in a door front plate and deformation of a door front plate (glass plate), caused by heat shrinkage of a foamed heat insulation material and a difference of linear expansion coefficients, is prevented.SOLUTION: A door includes a door front panel 8 made of a glass plate, a door rear panel 14, and a vacuum insulation panel 10 interposed between the door front panel 8 and the door rear panel 14. The vacuum insulation panel 10 is made in contact with the door front panel 8, and the door front panel 8 has a structure with no contact of a foamed heat insulation material.

Description

  Embodiments of the present invention relate to a door of a thermostatic chamber.

2. Description of the Related Art Conventionally, a constant temperature storage such as a refrigerator or a storage cabinet has a door that seals an opening of a storage body for taking in and out stored items. The door of this thermostatic chamber is generally provided with a door front plate and a door rear plate, and a foamed heat insulating material, particularly foamed urethane, is filled between the two plates.
In recent years, however, there is a glass plate made of the door front plate of the temperature-controlled cabinet mainly because of its good glossiness. In this, the back surface of the door front plate (glass plate) is colored (for example, refer to Patent Document 1), and a film for preventing scattering when the door front plate is broken (for preventing scattering). Film) is affixed (see, for example, Patent Document 2), and a foamed heat insulating material (foamed urethane) is filled between the door front plate and the door rear plate.

JP-A-5-322436 JP 2010-60190 A JP 2006-90649 A

However, foam insulation (foamed urethane) has a high degree of thermal shrinkage, and shrinks greatly upon cooling and hardening after filling between the door front plate and the door rear plate, and is further stored in the subsequent use. Shrinking even under the influence of internal cold air distorts even a tough glass plate.
In addition, the thermal insulation material (foamed urethane) has a larger linear expansion coefficient than that of the glass plate (the linear expansion coefficient of glass is 9 × 10 ⁻⁶ / ° C., and the linear expansion coefficient of urethane foam is 100 × 10 ⁻⁶ / ° C. In that situation, the door front plate is on the room temperature side, and the foam insulation that is in contact with the door front plate is on the cold air temperature side in the cabinet, so a bimetal phenomenon occurs due to the difference in the linear expansion coefficient. The front plate (glass plate) will be distorted.

  In Patent Document 3, a vacuum heat insulating panel is pasted on the back surface of the door front plate, and a foam heat insulating material (urethane foam) is filled between the vacuum heat insulating panel and the door front plate. However, this door front plate is made of a conventional steel plate, not glass. For this reason, the vacuum heat insulation panel affixed on the back surface of the door front plate also does not play the role of preventing the glass plate from being distorted due to the heat shrinkage of the foam heat insulating material and the difference in linear expansion coefficient. That is, it is clear that the technique of sticking a vacuum heat insulation panel to the back surface of the door front plate is not disclosed as preventing the heat shrinkage of the foam heat insulating material and the distortion of the glass plate due to the difference in linear expansion coefficient. It is.

  Therefore, in a thermostatic door that uses a glass plate for the door front plate, a constant temperature chamber that can provide a superior product by preventing the heat shrinkage of the foam insulation and the distortion of the door front plate (glass plate) due to the difference in linear expansion coefficient. Provide the door.

  The door of the temperature chamber of the present embodiment includes a door plate made of glass plate, a door rear plate, and a vacuum heat insulation panel positioned between both plates, and the vacuum heat insulation panel is brought into contact with the door front plate. The foamed heat insulating material is not in contact with the door front plate.

Cross-sectional view of the door showing the first embodiment Exploded perspective view of door Partial enlarged cross-sectional view of the door External perspective view of the entire refrigerator (constant temperature chamber) A perspective view for explaining the number of connecting sides of the door The perspective view for demonstrating the number of the joint sides of the conventional door The perspective view for demonstrating the number of the joint sides of a different conventional door FIG. 1 equivalent diagram showing the second embodiment

Hereinafter, a first embodiment applied to a refrigerator door will be described with reference to FIGS. 1 to 5.
First, FIG. 4 shows the entire contents of the refrigerator, and the vertically long box-shaped storage body 1 includes a refrigerator compartment, a vegetable compartment, an ice making compartment, a small freezer compartment, and a large freezer compartment (not shown). ), The opening part which is the storage goods entrance / exit of those rooms is sealed in the front part, respectively, refrigeration room doors 2, 3, vegetable room door 4, ice making room door 5, small freezer room door 6, large freezer room door 7 have. Among these doors 2 to 7, the refrigerator compartment doors 2 and 3 are double doors, the vegetable compartment door 4, the ice making door 5, the small freezer compartment door 6, and the large freezer compartment door 7 are drawer type doors. is there.

Next, FIG. 1 and FIG. 2 show the structure of one of the drawer type doors 2 to 7, in this case, the large freezer compartment door 7. It has a frame 9, a vacuum heat insulation panel 10 and a soft tape 11, a heat insulator 12, a drawer rail mounting plate 13, a door rear plate 14, and a gasket 15.
Among these, the door front plate 8 is made of a glass plate, is rectangular and smooth, and is colored on the back surface (rear surface) of the transparent glass plate. Alternatively, the glass plate itself is colored.

  The door outer frame 9 is a rectangular shape that is slightly larger than the door front plate 8, and the entire periphery of the upper side, lower side, left side, and right side is integrally formed of plastic such as ABS resin. In addition, a pull-out handle 16 is integrally formed on the upper side so as to protrude forward. In addition, the door outer frame 9 is integrally formed with a protruding inner edge portion 9a protruding inward on the front side of the inner peripheral portion. In addition, as for this protrusion inner edge part 9a, the back surface comprised the step shape of several steps, and is a taper shape. Further, on the rear side of the inner peripheral portion of the door outer frame 9, a door rear plate positioning portion 9b having an L-shaped cross section is integrally formed.

  The vacuum heat insulation panel 10 is made of, for example, glass wool, which is a thin fiberglass cotton material, made into a core material and made of a laminated film of aluminum foil and a synthetic resin such as PET (polyethylene terephthalate). The panel is housed in a sealed gas barrier container, the inside of the container is evacuated, and the opening is sealed to keep the inside of the container in a vacuum pressure-reduced state. The panel is thin and has low thermal conductivity (high heat insulation). The vacuum insulation panel 10 as a whole has a rectangular shape slightly smaller than the door front plate 8.

The soft tape 11 has a rectangular shape surrounding the vacuum heat insulation panel 10.
The heat insulator 12 is made of styrene foam and is a rectangle that is slightly smaller than the vacuum heat insulation panel 10.
The drawer rail mounting plate 13 is for attaching a drawer rail (not shown) for supporting a storage container (not shown) on the back side (rear side) of the large freezer compartment door 7 and is made of metal and is vertically long. It has a long shape, one on each side.

  In this case, the door rear plate 14 is made of plastic, is rectangular with a size approximately the same as the door front plate 8, and has a recess 14a for storing the drawer rail mounting plate 13 on both the left and right sides. A throat portion 14b for housing the heat insulator 12 is provided around the back side. The throat portion 14b is for preventing the leakage of cold air from the interior by entering the interior of the warehouse body 1 when it is closed and overlapping the inner side surface of the interior of the warehouse body 1. It has a frame shape.

  Further, a gasket mounting portion 14c (see FIG. 1) is provided on the outer side of the throat portion 14b and around the rear side of the door rear plate 14. The gasket mounting portion 14c is hollow, and the opening is directed rearward. The door rear plate 14 has a smooth inner side (center side) than the gasket mounting portion 14c and the throat portion 14b. Further, an insertion portion 14 d corresponding to the door rear plate positioning portion 9 b of the door outer frame 9 is formed at the front edge of the outer peripheral portion of the door rear plate 14.

  The gasket 15 has an arrowhead-shaped insertion part 15a at the foremost part, and has a hollow hermetically sealed air cushion part 15b on the back side, and further a magnet 15c for magnetically attaching to the cabinet body 1 on the back side. Built-in. In addition, the gasket 15 has fin portions 15d on both sides for preventing the leakage of cold air from the main body 1 more reliably.

  In this configuration, as shown in detail in FIG. 3, the double-sided adhesive tape 17 is attached to the front surface of the protruding inner edge portion 9 a of the door outer frame 9, and the door front plate 8 is attached to the front surface of the double-sided adhesive tape 17. In other words, the door front plate 8 is bonded and bonded to the front surface of the protruding inner edge portion 9a of the door outer frame 9 via the double-sided adhesive tape 17, whereby the door front plate 8 is attached to the door outer frame 9. The door outer plate 9 surrounds and supports the door front plate 8.

  Next, the soft tape 11 is wound around the outer periphery of the vacuum heat insulation panel 10, and an adhesive 18 is applied to the front surface of the vacuum heat insulation panel 10, and the front surface of the vacuum heat insulation panel 10 is connected to the door via the adhesive 18. The front plate 8 is attached to the back surface of the projecting inner edge portion 9a of the door outer frame 9 from the back surface. In other words, in other words, the vacuum heat insulation panel 10 is adhered to the door front plate 8 by adhering the vacuum heat insulation panel 10 to the door front plate 8 with the adhesive 18. The entire front surface is brought into contact with the door front plate 8 and the protruding inner edge portion 9a of the door outer frame 9, so that the foam insulation (foamed urethane) does not come into contact with the door front plate 8.

Furthermore, the contact area between the door front plate 8 and the vacuum heat insulation panel 10 is larger than the contact area between the door outer frame 9 and the door front plate 8.
In addition, as a result of the above-described pasting, the door outer frame 9, in particular, the protruding inner edge portion 9 a which is a part of the door outer frame 9 is located between the door front plate 8 and the vacuum heat insulating panel 10.

  Thereafter, the adhesive 19 shown in FIG. 1 is applied to the back surface of the vacuum heat insulation panel 10, and the front surface of the door rear plate 14 is attached to the back surface of the vacuum heat insulation panel 10 through the adhesive 19. At this time, the heat insulator 12 is stored in advance in the throat portion 14 b of the door rear plate 14, and the front surface of the door rear plate 14 is pasted on the back surface of the vacuum heat insulating panel 10 through the adhesive 19. At the same time, the front surface of the heat insulator 12 is also pasted.

In other words, the door rear plate 14 and the heat insulator 12 are bonded to the vacuum heat insulating panel 10 with the adhesive 19 so that the door rear plate 14 and the heat insulating body 12 are brought into contact with the vacuum heat insulating panel 10. By making the rear surface of the vacuum heat insulation panel 10 come into contact with the rear door plate 14 and the heat insulating body 12, the rear door plate 14 is prevented from being in contact with the foam heat insulating material (foam urethane).
At this time, the door rear plate 14 relative to the door outer frame 9 is positioned by inserting the insertion portion 14 d of the door rear plate 14 into the door rear plate positioning portion 9 b of the door outer frame 9.

  The space around the vacuum heat insulation panel 10, which is a space other than the space filled with the vacuum heat insulation panel 10, between the door front plate 8 and the door rear plate 14 is loaded with the soft tape 11. Therefore, foam insulation is provided between the door front plate 8 and the vacuum heat insulation panel 10 of the large freezer compartment door 7, between the door rear plate 14 and the vacuum heat insulation panel 10, and other door interior spaces. Has a configuration that does not exist.

In addition, the parts other than the door, such as the cabinet body 1, are filled with a foam heat insulating material alone or in combination with a vacuum heat insulating panel.
After that, the gasket 15 is attached to the rear door plate 14 by inserting the insertion portion 15a of the gasket 15 into the gasket mounting portion 14c of the rear door plate 14.

Thus, according to this embodiment, in the door (large freezer compartment door 7) which seals the opening part of the refrigerator which is a thermostat, glass door front board 8, door rear board 14, and both these boards 8 , 14 is provided, and the vacuum heat insulation panel 10 is brought into contact with the door front plate 8 so that the foam heat insulating material is not in contact with the door front plate 8.
Due to this, the door front plate is caused by the shrinkage of the foamed heat insulating material during the cooling and curing after filling and the shrinkage due to the cold air in the case of normal use, and the difference in linear expansion coefficient between the glass plate of the foamed heat insulating material. Thus, it is possible to provide an excellent product by preventing the distortion of 8.

Specifically, the foam insulation is not in contact with the door front plate 8, and it is avoided that the glass plate is affected by the thermal shrinkage of the foam insulation and the difference in linear expansion coefficient. Specifically, as described above, the linear expansion coefficient of glass is 9 × 10 ⁻⁶ / ° C., the linear expansion coefficient of urethane foam is 100 × 10 ⁻⁶ / ° C., and the linear expansion coefficient is α, If the internal temperature is t ₁ , the indoor (outside) temperature is t ₂ , the original length is L, and the extended length is ΔL, ΔL is obtained by the following equation.

ΔL = L × α × (t ₂ −t ₁ )
Therefore, when the internal temperature t ₁ is −18 [° C.], the indoor temperature t ₂ is 20 [° C.], and the door width (original length) L is 685 [mm],
In the glass plate,
ΔL = 685 × 9 × 10 ⁻⁶ × [20 − (− 18))] = 0.234427 (A)
In urethane foam,
ΔL = 685 × 100 × 10 ⁻⁶ × [20 − (− 18))] = 2.603 (b)
The difference in elongation between the glass plate and the urethane foam material at the door width of 685 [mm] due to the difference in linear expansion coefficient is (b)-(b): 2.603-0.23427 = 2. It is 36873, and there is a shrinkage difference of about 2.4 [mm], and the influence of this on the glass plate (deformation that impairs the appearance) can be avoided.

And the vacuum heat insulation panel 10 which contact | abutted to the door front board 8 made the glass wool which is a cotton-like material of a thin glass fiber into a mat shape as a core material as above-mentioned, and made this core material into aluminum foil and a synthetic resin The panel is housed in a gas barrier container made of laminate film, and the inside of the container is evacuated and the opening is sealed to keep the inside of the container in a vacuum-reduced state, that is, glass is the main material. Therefore, the linear expansion coefficient of this vacuum heat insulation panel 10 and the door front plate (glass plate) 8 is similar (it is a small linear expansion coefficient less than 1/10 of the foam heat insulating material using urethane foam). The influence due to the difference in expansion coefficient does not reach the glass plate unlike the foamed heat insulating material.
In this way, it is possible to provide an excellent product by preventing distortion of the door front plate (glass plate) 8.

  In addition, according to the present embodiment, the foam heat insulating material does not exist between the door front plate 8 and the vacuum heat insulating panel 10, between the door rear plate 14 and the vacuum heat insulating panel 10, and in other door interior spaces. It is said. Thereby, it is more reliably avoided that the influence by the difference of the thermal contraction of a foam heat insulating material and a linear expansion coefficient reaches a glass plate. In this case, the influence of the thermal contraction of the foam heat insulating material itself and the difference in the coefficient of linear expansion on the glass plate can be avoided more reliably, and the door rear plate 14 is cooled by the cool air inside the cabinet, and further after the door Since the foam insulation is not cooled through the plate 14 and the influence thereof does not reach the glass plate, it is more certain that the influence of the thermal contraction of the foam insulation and the difference in the coefficient of linear expansion will affect the glass plate. Therefore, it is possible to more reliably prevent distortion of the door front plate (glass plate) 8 and provide a more excellent product.

  Furthermore, in this case, in addition to the absence of foam insulation between the door front plate 8 and the vacuum heat insulation panel 10, there is no foam insulation between the door rear plate 14 and the vacuum insulation panel 10. Therefore, the door can be thinned.

  According to the present embodiment, the door front plate 8 and the vacuum heat insulation panel 10 are also attached by the adhesive 18. Thereby, the door front plate 8 and the vacuum heat insulation panel 10 are integrated, and scattering when the door front plate (glass plate) 8 is broken should be prevented by the vacuum heat insulation panel 10, particularly the bag-shaped gas barrier container. it can.

  That is, in this case, the bag-like gas barrier container of the vacuum heat insulation panel 10 comes to play the role of a conventional film for preventing scattering, and therefore, the use of the conventional film for preventing scattering can be omitted or used. Can be partially fastened, such as the surrounding (door outer frame 9) portion, and the cost can be reduced. Moreover, the use of the conventional anti-scattering film can be omitted or partially used, so that the anti-scattering film need not be peeled off when the door (large freezer compartment door 7) is recycled. , Workability can be improved.

In addition, the adhesive 18 may be cured due to adhesion after shrinkage and shrinkage due to cold inside the cabinet during normal use. According to this embodiment, the vacuum heat insulating panel 10 is brought into contact with the door front plate 8. Therefore, the coating thickness of the adhesive 18 can be reduced. Accordingly, the shrinkage of the adhesive 18 after curing and the storage during normal use according to the thinness of the coating thickness. Shrinkage due to the influence of the internal cold can be reduced, and distortion of the door front plate 8 due to the shrinkage can be prevented.
In this case, the vacuum heat insulating panel 10 may be attached to the door front plate 8 by another attaching means such as a double-sided adhesive tape instead of the adhesive 18.

  In addition, according to the present embodiment, the door outer frame 9 that supports the door front plate 8 is provided, and the door outer frame 9 and the door front plate 8 are in contact with each other. As a result, the door front plate (glass plate) 8 can be more reliably supported, which is effective in preventing the distortion.

Further, according to the present embodiment, the contact area between the door front plate 8 and the vacuum heat insulation panel 10 is larger than the contact area between the door outer frame 9 and the door front plate 8. In this case, if the door outer frame 9 is made of plastic and the ABS resin described above, the linear expansion coefficient is 71 × 10 ⁻⁶ , and the linear expansion coefficient is larger than that of the door front plate 8 and the vacuum heat insulating panel 10. . In this situation, the contact area between the door front plate 8 and the vacuum heat insulation panel 10 is larger than the contact area between the door outer frame 9 and the door front plate 8 because of the difference in linear expansion coefficient. The configuration is such that a similar one is more widely abutted than the one, thereby further improving the prevention of the distortion.

  Furthermore, according to the present embodiment, the door outer frame 9 (particularly, the protruding inner edge portion 9a which is a part of the door outer frame 9) is also positioned between the door front plate 8 and the vacuum heat insulating panel 10. As a result, intrusion of outside air between the door front plate 8 and the vacuum heat insulating panel 10 can be prevented by the door outer frame 9 positioned between them, so that the heat insulation of the door due to the intrusion of the outside air is further reduced. It can be surely prevented.

The door outer frame 9 is integrally formed on the entire periphery, and the door front plate 8 is coupled to the door outer frame 9. As a result, the number of connecting sides between the door outer frame 9 and the door front plate 8 can be reduced, and intrusion of outside air can be prevented more reliably.
6 and 7 show different structures of the door outer frame and the door front plate, and FIG. 6 shows the door outer frame at two points, the upper outer frame 101 and the lower outer frame 102. FIG. 7 shows a door 104 that is configured by combining a door front plate 103 that wraps around from the front to the left and right sides, and FIG. 7 shows the door outer frame as an upper outer frame 201, a lower outer frame 202, and A door 206 is shown that is configured by four points, a left outer frame 203 and a right outer frame 204, combined with a door front plate 205 having only a front surface portion.

Of these, the former in the door 104 (FIG. 6), the number of coupling edges and Tobiragaiwaku (upper outer frame 101 and the lower outer frame 102) and the front door plate 103, each side of the _B 1 .about.B ₆ shown In the latter door 206 (FIG. 7), the connecting edge between the door outer frame (upper outer frame 201, lower outer frame 202, left outer frame 203, right outer frame 204) and the door front plate 205 is shown. There are 12 numbers C _{1 to} C ₁₂ shown in the figure.

For these, the number of coupling edges of a door outer frame 9 and the door front plate 8 of the door of the present embodiment (large freezer compartment door 7), as shown in FIG. 5, four A ₁ to A ₄ There is only.
In this way, according to the present embodiment, the number of joint sides that can be invaded by outside air can be reduced, and intrusion of outside air can be prevented more reliably. It is possible to more reliably prevent a decrease in heat insulation.

In contrast to this, FIG. 8 shows a second embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.
In this case, the rear door plate 31 is replaced with the rear door plate 14 of the first embodiment and does not have a gasket mounting portion. Therefore, the throat portion similar to the throat portion 14b of the first embodiment is used. The portion outside 31b is smooth like the area inside (center side) from the throat portion 31b, and the gasket is attached to the cabinet body 1 side.
In addition, the insertion part 31d is the same as the insertion part 14d of the first embodiment.
The door rear plate 31 may have such a configuration.

  In addition, the door of the constant temperature chamber demonstrated above is not limited only to the said embodiment, Especially as a constant temperature storage, it is not restricted to a refrigerator, A warm storage may be used. The present invention is not limited to the freezer compartment door 7 and may be implemented by appropriately changing within the range not departing from the gist, such as other doors 2 to 6.

  In addition, although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 2 to 7 are doors, 8 is a door front plate, 9 is a door outer frame, 9a is a protruding inner edge of the door outer frame, 10 is a vacuum heat insulating panel, 14 is a door rear plate, 18 is an adhesive, and 31 is an adhesive. The rear door plate is shown.

Claims (7)

In the door that seals the opening of the temperature chamber,
A front door plate made of glass, a rear door plate, and a vacuum heat insulation panel positioned between the two plates are brought into contact with the front door plate. The door of the temperature chamber characterized by not touching.   2. The door of the thermostatic chamber according to claim 1, wherein the foam insulation is not present between the door front plate and the vacuum heat insulation panel, between the door rear plate and the vacuum heat insulation panel, and in any other interior space of the door. .   The door of the thermostat according to claim 1 or 2, wherein the door front plate and the vacuum heat insulation panel are pasted by a pasting means such as an adhesive or a double-sided adhesive tape.   The door of the thermostatic chamber according to any one of claims 1 to 3, further comprising a door outer frame that supports the door front plate, wherein the door outer frame and the door front plate are in contact with each other.   The door of the thermostat according to claim 4, wherein the contact area between the door front plate and the vacuum heat insulation panel is larger than the contact area between the door outer frame and the door front plate.   The thermostat according to any one of claims 1 to 5, further comprising a door outer frame that supports the door front plate, the door outer frame being located between the door front plate and the vacuum heat insulating panel. Storage door.   The door outer frame that supports the door front plate is integrally formed on the entire periphery, and the door front plate is coupled to the door outer frame. The thermostatic chamber according to any one of claims 1 to 6, door.

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