TW201703692A - Glass door for refrigerator showcase - Google Patents

Abstract

Provided is a glass door for a refrigerator showcase, wherein: the glass door has a first glass plate disposed on the chamber-external side of the refrigerator showcase, a second glass plate disposed on the chamber-internal side of the refrigerator showcase, and a third glass plate disposed between the first glass plate and the second glass plate, the third glass plate being separated from the first glass plate and second glass plate; and a first distance between the chamber-external-side surface of the first glass plate and the thickness-direction central axis of the third glass plate and a second distance between the chamber-internal-side surface of the second glass plate and the thickness-direction central axis of the third glass plate are different from each other.

Description

Refrigerated display case with glass door

The present invention relates to a glass door for a refrigerated display case.

In the past, in the convenience store, etc., various products (beverages, fresh foods, frozen foods, etc.) are stored and sold in the refrigerated display case. The refrigerated display case has a door including a window frame and a glass plate on the front side, and a handle is mounted on the front surface of the window frame. The door can be opened and closed by opening and closing the handle by the user. Moreover, the door system is substantially made of glass except for the window frame of the periphery, so that the user can recognize and select the products in the cabinet without opening the door.

As a laminated glass structure for a refrigerating display case, for example, a laminated glass structure or the like is known (for example, refer to Patent Document 1), and the laminated glass structure or the like includes a first glass plate which is located in a refrigerated display. The inside of the cabinet; the second glass panel is opposite to the first glass panel and located outside the cabinet; and the third glass panel is spatially opposed to the second glass panel, and Located on the outside of the cabinet.

Patent Document 1: Japanese Patent No. 5424059

However, the distance between the first glass plate and the second glass plate of the laminated glass structural system described in Patent Document 1 is the same as the distance between the second glass plate and the third glass plate, and thus, when used as a refrigerating display case, There is a problem that the volume of the space due to the temperature difference between the inside and the outside of the cabinet is reduced, resulting in a decrease in the adiabatic efficiency.

Accordingly, it is an object of the present invention to provide a freeze preventing freezing of a display case A glass door for a refrigerated display case that has a reduced adiabatic efficiency due to a temperature difference between the inside and outside of the cabinet during operation.

In order to achieve the above object, a glass door for a refrigerating display cabinet according to an aspect of the present invention has: a first glass plate disposed outside the cabinet of the refrigerating display cabinet; and a second glass plate disposed in the cabinet of the refrigerating display cabinet And a third glass plate disposed between the first glass plate and the second glass plate so as to be spaced apart from the first glass plate and the second glass plate; and the outer surface of the first glass plate a first distance between the first distance between the center line in the thickness direction of the third glass sheet and the center line between the inner surface of the second glass sheet and the thickness direction of the third glass sheet different.

According to the present invention, the heat insulating performance can be improved without increasing the thickness of the glass door.

10‧‧‧ cabinet outside glass plate

11‧‧‧Front glass panel

11a‧‧‧glass plate

11b‧‧‧glass plate

11c‧‧‧ interlayer film

12‧‧‧ cabinet outside glass plate

20‧‧‧ cabinet inner glass plate

21‧‧‧ cabinet inner glass plate

30‧‧‧Central glass plate

30C‧‧‧ center line

31‧‧‧Central glass plate

40‧‧‧ Spacer

41‧‧‧ Spacer

50‧‧‧ door frame

51‧‧‧Clamping members

52‧‧‧Support components

60‧‧‧Line heater

61‧‧‧Line heater

70‧‧‧Magnetic washer

80‧‧‧Frame

81‧‧‧ components

82‧‧‧ components

83‧‧‧Washing seat

D1‧‧‧ distance

D2‧‧‧ distance

D3‧‧‧ interval

D4‧‧‧ interval

S1‧‧‧ hollow layer

S2‧‧‧ hollow layer

Fig. 1 is a side cross-sectional view showing an example of a glass door for a refrigerating display case of a reference example.

Fig. 2 is a side cross-sectional view showing an example of a glass door for a refrigerating display case according to the first embodiment of the present invention.

Figure 3 is a graph showing the adiabatic characteristics of helium, argon and dry air.

Fig. 4 is a side cross-sectional view showing an example of a glass door for a refrigerating display case according to a second embodiment of the present invention.

Fig. 5 is a side cross-sectional view showing an example of a glass door for a refrigerating display case according to a third embodiment of the present invention.

Fig. 6 is a side cross-sectional view showing an example of a glass door for a refrigerating display case according to a fourth embodiment of the present invention.

Fig. 7 is a view showing an example of a glass door for a refrigerating display case according to a fifth embodiment of the present invention; Side section view.

Hereinafter, the description of the form for carrying out the invention will be made with reference to the drawings.

First, before the detailed description of the glass door for a refrigerating display case according to the embodiment of the present invention, a glass door for a refrigerating display case of a reference example which has been conventionally used will be described.

Fig. 1 is a side cross-sectional view showing an example of a glass door for a refrigerating display case of a reference example which is generally used. The glass door for the refrigerating display cabinet of the reference example has a glass plate 10 on the outer side of the cabinet of the refrigerated display cabinet, a glass plate 20 on the inner side of the cabinet, and a glass plate 30 disposed at the center between the outer glass panel 10 and the inner glass panel 20 of the cabinet. . Here, the outer side of the cabinet refers to the outside of the refrigerated display cabinet, and the inner side of the cabinet refers to the inside of the refrigerated display cabinet.

Between the cabinet outer glass panel 10 and the central glass panel 30, and between the cabinet inner glass panel 20 and the central glass panel 30, spacers 40, 41 are respectively disposed to maintain the cabinet outer glass panel 10 and the central glass panel 30. The interval d3 is the interval d4 between the inner glass panel 20 and the central glass panel 30.

The lower ends of the glass sheets 10, 20, 30 and the spacers 40, 41 are held by the door frame 50. The door frame 50 includes a holding member 51 that sandwiches the glass sheets 10 to 30 and the spacers 40, 41, and a supporting member 52 that supports the holding member 51. The holding member 51 contains, for example, a resin such as polyvinyl chloride (PVC). The support member 52 is made of a metal such as aluminum so that the glass sheets 10 to 30 and the spacers 40, 41 can be surely supported via the sandwiching member 51, and the heat from the inner linear heater 60 can be transmitted.

A wire heater 60 is provided to the support member 52 of the door frame 50, and is configured to be heated. By the heating of the linear heater 60, it is possible to prevent condensation from occurring in the door frame 50 during the freezing operation of the refrigerating display case.

A frame 80 is provided to surround the inside and the side of the cabinet of the door frame 50. The frame 80 is configured by fitting two members 81 and 82, and the holder seat is held by the member 81 and the member 82. 83. A linear heater 61 is provided to the member 82 to prevent condensation of the frame 80. Therefore, the member 82 preferably contains a metal such as aluminum having high thermal conductivity, and the other member 81 may contain, for example, a resin such as polyvinyl chloride. Furthermore, the washer seat surface 83 contains a magnet.

The magnet washer 70 is a sealing member that is attached to the side of the inside of the cabinet of the door frame 50 and that is used to maintain the seal between the glass door and the frame 80 when the glass door is closed. The magnet washer 70 attracts the washer seat surface 83 by magnetic force, and maintains the sealing property between the magnet washer 70 and the washer seat surface 83.

In the glass door for the refrigerating display case having the reference example of the configuration, the glass plates 10 to 30 are all of the same thickness, and the interval d3 between the outer glass plate 10 and the central glass plate 30, and the inner glass plate 20 and The interval d4 between the central glass sheets 30 is the same size. That is, the glass sheets 10 to 30 have an unbiased symmetrical arrangement of the entire balance in the thickness direction. Here, if the thickness of the whole is set to 25 mm, the center line on the outer side of the glass sheet 10 on the outer side of the cabinet and the center line in the thickness direction of the center glass (more precisely, the center plane or the surface including the center line) 30C The distance d1, the distance d2 between the outer surface of the glass plate 20 on the inner side of the cabinet (the surface in the cabinet) and the center line 30C in the thickness direction of the center glass are also balanced, and the distance d1 is equal to the distance d2.

Here, the thickness of the cabinet outer glass panel 10, the cabinet inner glass panel 20, and the central glass panel 30 is all 3 mm, and the interval d3 between the inner side surface of the cabinet outer glass panel 10 and the outer side surface of the center glass panel 30. The distance d4 between the inner surface of the inner glass panel 10 (the outer surface of the cabinet) and the inner surface of the inner glass panel 30 is equal to 8 mm, so that the intervals d3 and d4 are balanced without deviation from each other. Further, the distance d1 between the outer surface of the cabinet outer glass panel 10 (the outer surface of the cabinet) and the center line 30C of the central glass 30 in the thickness direction and the outer surface of the inner glass panel 20 (the inner surface of the cabinet) are The distance d2 between the center lines 30C in the thickness direction of the center glass 30 is equal to 3+8+1.5=12.5 mm, and the distances d1 and d2 are balanced with each other without deviation. Thus, in general, the door portion of the glass door of the refrigerated display cabinet is made in the thickness direction, and is produced symmetrically on the outer side of the cabinet and the inside of the cabinet.

However, the refrigerated display case was made with a glass door system in an environment of approximately 23 ± 2 °C. If it is used as a glass door for a refrigerated display case that is frozen at a temperature of approximately -25 ° C in the cabinet, the temperature difference from the temperature outside the cabinet of approximately 25 ° C becomes larger, according to Boyle-Charle's law. The volume of the hollow layer S2 inside the cabinet between the inner glass panel 20 and the central glass panel 30 is reduced. Therefore, the air layer (gas layer) of the hollow layer S2 inside the cabinet is reduced, thereby causing a problem that the adiabatic efficiency of the hollow layer S2 inside the cabinet is lowered.

In the glass door for a refrigerating display cabinet according to the embodiment of the present invention, the distance d1 between the outer surface of the glass plate 10 on the outer side of the cabinet (the outer surface of the cabinet) and the center line in the thickness direction of the center glass plate 30 is the inner side of the cabinet. The distance d2 between the outer surface of the glass plate 20 (the inner surface of the cabinet) and the center line in the thickness direction of the center glass plate 30 is unbalanced to prevent such adiabatic efficiency from deteriorating. Hereinafter, the specific content will be described.

[First Embodiment]

Fig. 2 is a side cross-sectional view showing an example of a glass door for a refrigerating display case according to the first embodiment of the present invention. In FIG. 2, the position and configuration of the cabinet outer glass panel 10 and the cabinet inner glass panel 20 are the same as those of FIG. 1, but the central glass panel 30 is located close to the cabinet inner glass panel 20 and becomes the distance d1 from the cabinet outer glass panel 10. And a state different from the distance d2 of the glass plate 20 on the inner side of the cabinet, so that an imbalance occurs between the two. Specifically, the interval d3 between the inner side surface of the cabinet outer glass panel 10 and the outer side surface of the center glass panel is 10 mm, and the inner side surface of the cabinet inner glass panel 20 (the outer side of the cabinet) and the central glass panel The interval d4 between the faces on the inner side of the cabinet becomes 6 mm, so that d4 < d3. Further, the distance d1 between the outer surface of the cabinet outer glass plate 10 and the center line 30C in the thickness direction of the center glass plate 20 is 3 + 10 + 1.5 = 14.5 mm, and the outer side of the glass plate 20 on the inner side of the cabinet (the inside of the cabinet) The distance d2 from the center line 30C in the thickness direction of the center glass plate 20 is 3+6+1.5=10.5 mm, and still becomes d2<d1. With this configuration, the volume of the hollow layer S2 between the inner glass panel 20 and the central glass panel 30 becomes smaller than the volume of the hollow layer S1 between the outer glass panel 10 and the central glass panel 30, thereby reducing the cabinet. The air layer of the hollow layer S2 caused by the cooling of the inner side The relative reduction in volume of the (gas layer). Thereby, even if a large temperature difference occurs between the outer side of the cabinet and the inner side of the cabinet, the difference in the amount of reduction of the air layer (gas layer) of the hollow layer S1 and the hollow layer S2 is also small, so that the heat insulation efficiency of the inside of the cabinet can be prevented. decline.

Further, krypton (Kr) gas is generally enclosed in the hollow layers S1 and S2, respectively. The present inventors have found that, in the case where helium gas is sealed to the hollow layers S1, S2, the space d3 between the cabinet outer glass sheet 10 and the center glass sheet 30 or between the cabinet inner glass sheet 20 and the center glass sheet 30 When the interval d4 is approximately 10 mm, the gas layer of the helium gas in the hollow layers S1 and S2 can be optimized, and the heat insulating performance is most excellent. In the glass door for a refrigerating display case according to the first embodiment, an example in which the interval d3 between the cabinet outer glass plate 10 and the center glass plate 30 is set to 10 mm will be described.

However, the position at which the central glass plate 30 is disposed is not limited to the example shown in FIG. 2, and is configured as the interval d3 between the outer glass plate 10 and the central glass plate 30, and the inner glass plate 20 and the central glass plate 30. When there is a deviation or an imbalance in the interval d4 between the two, the position can be set at various positions. In this case, the interval d3 between the cabinet outer glass panel 10 and the central glass panel 30 divided by the distance d4 between the cabinet inner glass panel 20 and the central glass panel 30 may exceed 1.0, and may be 1.1 or more. It may be 1.2 or more, 1.4 or more, or 1.6 or more. Further, it may be 2.2 or less, may be 2.0 or less, or may be 1.8 or less. In the present embodiment, an example in which the interval d4 between the inner glass panel 20 and the central glass panel 30 is narrower than the interval d3 between the cabinet outer glass panel 10 and the center glass panel 30 will be described. Depending on the application, it is also possible to make the interval d3 between the cabinet outer glass panel 10 and the center glass panel 30 narrower than the interval d4 between the cabinet inner glass panel 20 and the center glass panel 30. In this case, the interval d3 between the outer glass panel 10 and the central glass panel 30 divided by the distance d4 between the inner glass panel 20 and the central glass panel 30 may be less than 1.0, and may be 0.9 or less. It may be 0.85 or less, 0.8 or less, 0.7 or less, or 0.65 or less. Further, it may be 0.4 or more, may be 0.5 or more, or may be 0.55 or more.

Moreover, these are related to the outer side of the glass panel 10 on the outside of the cabinet and the central glass 30. In the relationship between the distance d1 between the center line 30C in the thickness direction and the distance d2 between the outer side surface of the glass plate 20 on the inner side of the cabinet (the inner side of the cabinet) and the center line 30C in the thickness direction of the center glass plate 30 It is also the same. As long as the distance d1 is different from the distance d2, variations and imbalances occur between the two, and various configurations can be adopted.

Further, not only helium gas but also other kinds of gases such as argon gas may be used as the gas sealed in the hollow layers S1 and S2. The present inventors have also found that the interval d3 between the glass plate 10 on the outside of the cabinet and the central glass plate 30 or the glass plate 20 on the inner side of the cabinet and the central glass plate 30 when the argon gas is sealed to the hollow layers S1, S2. When the interval d4 is approximately 15 mm, the gas layer of the argon gas in the hollow layers S1 and S2 can be optimized, and the heat insulating performance is most excellent.

Figure 3 is a graph showing the adiabatic characteristics of helium, argon and dry air. In Fig. 3, the horizontal axis represents the interval d3, d4 between the cabinet outer glass panel 10 or the cabinet inner glass panel 20 and the center glass panel 30, and the vertical axis indicates the heat insulating performance. As shown in Fig. 3, the helium gas exhibits the highest thermal insulation performance at intervals d3 and d4 of 9 to 11 mm, and the argon gas exhibits the highest thermal insulation performance when the interval d3 and the d4 are 14 to 16 mm. Further, when the dry air is 15 to 17 mm at intervals d3 and d4, the heat insulating performance is the highest. For example, for the gas enclosed in the hollow layers S1 and S2, if the heat insulating property shown in FIG. 3 is obtained and the intervals d3 and d4 are determined corresponding thereto, the hollow layer S1 of at least one side of the cabinet outer side or the cabinet inner side can be set. The thermal insulation performance of S2 is the best condition, which can effectively improve the thermal insulation performance of the glass door. In this way, the gas to be sealed in the hollow layers S1 and S2 may be not only helium gas but also other gases such as argon gas. In this case, the position of the central glass plate 30 can be appropriately set in consideration of the gas to be sealed, the use, and the like. position.

The other components are the same as those of the glass door for the refrigerating display case of the comparative example described in FIG. 1, and the same components are denoted by the same reference numerals, and the description thereof will be omitted.

According to the glass door for a refrigerating display case according to the first embodiment of the present invention, the thickness is as a whole The degree of change of 25 mm is not changed, and the position of the center glass plate 30 is disposed at an appropriate position where the outside of the cabinet and the inside of the cabinet are unbalanced, whereby the heat insulating performance can be improved. In particular, the central glass sheet 30 can be disposed such that the volume of the hollow layer S2 on the inner side of the cabinet becomes smaller than the volume of the hollow layer S1 on the outer side of the cabinet, thereby improving the heat insulating property of the hollow layer S2 inside the cabinet at the time of freezing.

[Second Embodiment]

Fig. 4 is a side cross-sectional view showing an example of a glass door for a refrigerating display case according to a second embodiment of the present invention. In Fig. 4, the glass door for the refrigerating display case according to the second embodiment has a thickness of 1 mm in the center glass plate 31, and the interval d4 between the inner glass plate 20 and the center glass plate 31 is 8 mm from 6 mm. In contrast, the glass door for a refrigerating display case according to the first embodiment is different. On the other hand, in the glass door for a refrigerating display case according to the second embodiment, the cabinet outer glass panel 10 and the cabinet inner glass panel 20 each have a thickness of 3 mm, and are disposed integrally at both ends of the thickness of 25 mm. The distance d3 between the cabinet outer glass panel 10 and the center glass panel 31 is 10 mm, which is the same as the glass door for the refrigerating display cabinet of the first embodiment.

The central glass plate 31 is disposed between the glass plate 10 on the outer side of the cabinet and the glass plate 20 on the inner side of the cabinet, and is not in contact with the user, and is configured to be protected by both. Therefore, it is not necessary to have the glass plate 10 on the outer side of the cabinet. And the same strength of the glass plate 20 on the inside of the cabinet. Further, the center glass plate 31 can be formed thinner, and the weight of the glass door can be reduced. Therefore, in the glass door for a refrigerating display case according to the second embodiment, the central glass plate 31 is formed to be thinner than the outer glass plate 10 and the inner glass plate 20, and the hollow layer S1 and the cabinet on the outer side of the cabinet An imbalance occurs between the inner hollow layers S2.

In the glass door for a refrigerating display case according to the second embodiment, it is also possible to cause an imbalance between the outer side of the cabinet and the inner side of the cabinet by making the thickness of the center glass plate 31 thin. That is, in the glass door for the refrigerating display case of the reference example of FIG. 1, the thickness of the central glass plate 30 is 3 mm, the interval d3 between the outer glass plate 10 and the central glass plate 30, and the inner glass plate 20 and the middle of the cabinet. The interval d4 between the central glass sheets 30 is 8 mm. On the other hand, in the glass door for a refrigerating display case according to the second embodiment, the thickness of the central glass plate 31 is reduced by 2 mm, and the thinned portion of 2 mm is applied to the hollow layer S1, so that the inner glass plate 20 and the central glass are provided. The interval d4 between the plates 30 is maintained at 8 mm, and on the other hand, the interval d3 between the cabinet outer glass plate 10 and the center glass plate 31 is increased by 2 mm to 10 mm. Also in this case, d4<d3, the volume of the hollow layer S2 inside the cabinet is smaller than the volume of the hollow layer S1 on the outer side of the cabinet, so that the volume change amount during freezing can be made small, and the hollow layer S2 inside the cabinet can be raised. Insulation.

Thus, by making the thickness of the central glass plate 31 thin, an imbalance occurs between the interval d3 between the hollow layers S1 on the outer side of the cabinet and the interval d4 between the hollow layers S2 on the inner side of the cabinet. Also in this case, the distance d1 between the outer surface of the outer glass panel 10 and the center line 31C in the thickness direction of the central glass sheet 31 is 3 + 10 + when the thickness of the entire glass door is fixed to 25 mm. 0.5=13.5 mm, in contrast, the distance d2 between the outer surface of the glass plate 20 on the inner side of the cabinet (the inner side of the cabinet) and the center line 31C in the thickness direction of the center glass plate 31 is 3+8+0.5=11.5. Mm, the distance d1 is different from the distance d2 (d2 < d1), resulting in an imbalance.

Further, in the glass door for a refrigerating display case according to the second embodiment, the interval d3 between the cabinet outer glass plate 10 and the center glass plate 31 is set to 10 mm, and the helium gas is sealed to the hollow layers S1 and S2. In the case of this, it is set to obtain the optimum heat insulating performance in the hollow layer S1.

However, as described in the description of the glass door for a refrigerating display case according to the first embodiment, the gas sealed in the hollow layers S1 and S2 may be various gases including argon gas or the like depending on the application. Thereby, the interval d3 between the outer glass panel 10 and the central glass panel 31, the interval d4 between the inner glass panel 20 and the central glass panel 30, and the glass panel 10 on the outside of the cabinet are used depending on the application, the enclosed gas, and the like. The distance d1 between the outer surface and the center line 31C in the thickness direction of the center glass plate 31 and the outer surface of the inner glass panel 20 (the inner side of the cabinet) and the center line in the thickness direction of the center glass plate 31 The distance d2 between 31C can be set to various values. This aspect is the same as the glass door for the refrigerating display case of the first embodiment. Further, the thickness of the center glass plate 31 is not limited to 1 mm, and may be various thicknesses depending on the application as long as it is thinner than the glass plate 10 on the outer side of the cabinet and the glass plate 20 on the inner side of the cabinet. Further, the central glass plate 31 may have various thicknesses, but may be formed to have a thickness of, for example, 0.8 mm or more and 2 mm or less, and is preferably formed to have a thickness of 1.1 mm or more and 2 mm or less.

According to the glass door for a refrigerating display case according to the second embodiment, the thickness of the central glass plate 31 can be made thinner than the thickness of the glass plate 10 on the outer side of the cabinet and the glass plate 20 on the inner side of the cabinet. Under the reduction of the quantification and manufacturing cost, an imbalance occurs between the outer layer of the cabinet S1 and the inner layer of the cabinet S2, thereby improving the thermal insulation performance of the glass door.

[Third embodiment]

Fig. 5 is a side cross-sectional view showing an example of a glass door for a refrigerating display case according to a third embodiment of the present invention. The glass door panel outer glass panel 11, the cabinet inner glass panel 20, and the center glass panel 31 of the third embodiment are arranged and have the same thickness as the glass door for the refrigerating display cabinet of the second embodiment, but The laminated glass is used for the glass panel 11 on the outside of the cabinet, and is different from the glass door for the refrigerating display cabinet of the second embodiment.

A laminated glass is a glass in which a pair of glass sheets are sandwiched by an intermediate film containing a resin. The glass plate located on the surface is bonded to the intermediate film containing the resin, so that even if the glass plate located on the surface is broken, the glass plate can be kept in the state of being bonded to the intermediate film without scattering. Thereby, the laminated glass is a glass having high safety, and it is often used as a glass plate on the outer side of the cabinet which is in contact with the user.

In FIG. 5, a pair of glass plates 11a and 11b are joined to each other via an intermediate film 11c containing a resin, thereby constituting the cabinet outer glass plate 11. The entire outer glass panel 11 is formed by 3 mm, and the entire arrangement of the cabinet outer glass panel 11, the cabinet inner glass panel 20, and the central glass panel 31 is the same as that of the glass display for the refrigerating display cabinet of the second embodiment. The heat insulating performance can have the same heat insulating performance as that of the glass door for a refrigerating display case of the second embodiment. In addition, the safety of the glass 11 on the outside of the cabinet is high, so Both the improvement in insulation performance and the improvement in safety are achieved.

The other components and the details are the same as in the second embodiment, and the same components are denoted by the same reference numerals, and their description is omitted.

According to the glass door for a refrigerating display case according to the third embodiment, the glass panel 11 on the outside of the cabinet which is in contact with the user can be formed as a laminated glass, thereby improving the heat insulating performance and improving the safety. .

[Fourth embodiment]

Fig. 6 is a side cross-sectional view showing an example of a glass door for a refrigerating display case according to a fourth embodiment of the present invention. In the glass door for the refrigerating display case of the fourth embodiment, the glass plate 10 on the outside of the cabinet is still 3 mm, and the central glass plate 31 is still 1 mm, but the glass plate 21 on the inside of the cabinet is 1 mm from 3 mm, which is different from the second. A glass door for a refrigerated display case of an embodiment.

Although the inside glass panel 21 is not frequently contacted by the user like the glass panel 10 on the outside of the cabinet, it constitutes the outer surface of the glass door, and therefore requires strength more than the central glass sheet 31 which is not exposed on the surface. However, by using chemically strengthened glass, even if the thickness is made thin, a glass plate having sufficient strength can be obtained. In the present embodiment, the cabinet inner glass plate 21 is made of such chemically strengthened glass, and is formed to have a thickness of 1 mm similarly to the center glass plate 31.

As shown in FIG. 6, the thickness of the entire glass door can be set to 25 mm by setting the glass plate 21 on the inner side of the cabinet to 1 mm, and the interval d3 between the outer glass plate 10 and the central glass plate 31 can be Both the interval d4 between the inner glass plate 21 and the central glass plate 31 are set to 10 mm. Thereby, if the hollow layer S1 between the cabinet outer glass panel 10 and the central glass panel 31 and the hollow layer S2 between the cabinet inner glass panel 21 and the central glass panel 31 are sealed with helium gas, the hollow layer outside the cabinet can be made The thermal insulation performance of both S1 and the hollow layer S2 on the inner side of the cabinet is optimized, so that extremely high heat insulation performance can be achieved.

Further, in the fourth embodiment, the interval d3 is equal to the interval d4, but between the outer surface of the glass plate 10 on the outer side of the cabinet and the center line 31C in the thickness direction of the center glass plate 31. The distance d1 is 3 + 10 + 0.5 = 13.5, whereas the distance d2 between the outer surface of the inner side glass plate 21 (the inner side of the cabinet) and the center line 31C in the thickness direction of the center glass plate 31 is 1 +10+0.5=11.5, the two become unbalanced. In this manner, not only the central glass plate 31 can be thinned, but also the inner glass plate 21 can be thinned, and the outer surface of the outer glass plate 10 and the thickness of the central glass plate 31 can be formed. An imbalance occurs between the distance d1 between the center line 31C and the distance d2 between the outer surface of the glass plate 21 on the inner side of the cabinet (the inner side of the cabinet) and the center line 31C in the thickness direction of the center glass plate 31. Optimal thermal insulation performance is achieved in both the outer side of the cabinet and the hollow layers S1, S2 on the inside of the cabinet.

According to the glass door for a refrigerating display case of the fourth embodiment, not only the center glass plate 31 but also the chemically tempered glass is used to form the inner glass plate 21, whereby the glass door can be lightened as a whole. Optimal thermal insulation performance is achieved in the hollow layers S1, S2 of both the outside of the cabinet and the inside of the cabinet.

[Fifth Embodiment]

Fig. 7 is a side cross-sectional view showing an example of a glass door for a refrigerating display case according to a fifth embodiment of the present invention. In the glass door for a refrigerating display case according to the fifth embodiment, not only the cabinet inner glass plate 21 and the center glass plate 31 are formed to be thinner than 1 mm, but also the cabinet outer glass plate 12 is set to be 1 mm thinner. In terms of formation, it is different from the glass door for the refrigerating display case of the fourth embodiment. In the glass door for a refrigerating display case according to the fifth embodiment, the chemically strengthened glass is also used for the glass plate 12 on the outer side of the cabinet, and the outer glass panel 12 having a large contact with the user is also formed thinly. In this way, by using the chemically strengthened glass, the outer glass panel 12 can be formed thinner, and the glass door can be further reduced in weight.

Further, in the glass door for a refrigerating display case according to the fifth embodiment, the interval d4 between the inner glass plate 21 and the central glass plate 31 is set to 10 mm, whereas the outer glass plate 12 and the central glass plate are opposed to each other. The distance d3 between 31 is set to 12 mm, and the two are set unbalanced. Moreover, the outer surface of the outer glass panel 12 and the thickness direction of the central glass plate 31 The distance d1 between the upper center lines 31C is 1+12+0.5=13.5 mm, whereas the outer side of the glass plate 21 on the inner side of the cabinet (the inner side of the cabinet) and the center in the thickness direction of the center glass plate 31. The distance d2 between the lines 31C is 1 + 10 + 0.5 = 11.5 mm, so that the distance d1 and the distance d2 become unbalanced.

Further, since the interval d4 between the inner glass plate 21 and the central glass plate 31 is 10 mm, the hollow layer S1 between the outer glass plate 12 and the central glass plate 31 and the inner glass plate 21 and the center of the cabinet can be used. The hollow layer S2 between the glass sheets 31 is sealed with helium gas to optimize the heat insulating performance of the hollow layer S2 inside the cabinet. Further, since the distance d3 between the glass plate on the outer side of the cabinet and the central glass plate 31 is 12 mm, d4 < d3, and the hollow layer S2 on the inner side of the cabinet is smaller in volume than the hollow layer S1 on the outer side of the cabinet, and becomes a volume due to cooling. The composition of the shrinkage change is small, so that the heat insulation inside the cabinet can be effectively improved.

According to the glass door for a refrigerating display case according to the fifth embodiment, the outer side glass plate 11 and the inner side glass plate 21 can be formed by chemically tempered glass, and the outer side glass plate 12, the inner side glass plate 21, and the center can be formed thinly. The glass plate 31 realizes the weight reduction of the entire glass door and optimizes the heat insulating performance of the glass door.

In the above, the glass door for the refrigerating display case according to the first to fifth embodiments has been described. In all of the embodiments, it is also possible to perform low-radiation on at least one side of the central glass sheets 30 and 31, that is, at least one side. (Low-E, Low-Emissivity) coating. Thereby, the thermal insulation performance of the glass door for the refrigerating display cabinet can be further improved.

In addition, the glass door for a refrigerating display case according to the third embodiment of the laminated glass can be combined with the glass door for the refrigerating display case according to the first, second, and fourth embodiments, and the laminated glass 11 is used as the first. The cabinet exterior glass panel 10 of the second and fourth embodiments.

Further, the thicknesses and installation positions of the respective glasses 10, 11, 12, 20, 21, 30, and 31 described in the first to fifth embodiments are merely examples, and it is needless to say that various modifications can be made depending on the application.

The preferred embodiments of the present invention have been described in detail above, but the present invention The present invention is not limited to the above embodiments, and various changes and substitutions may be made to the above embodiments without departing from the scope of the invention.

The present application is based on the priority of Japanese Patent Application No. 2015-134947, filed on Jul. 6, 2015, the entire disclosure of which is incorporated herein by reference.

10‧‧‧ cabinet outside glass plate

20‧‧‧ cabinet inner glass plate

30‧‧‧Central glass plate

30C‧‧‧ center line

40‧‧‧ Spacer

41‧‧‧ Spacer

50‧‧‧ door frame

51‧‧‧Clamping members

52‧‧‧Support components

60‧‧‧Line heater

61‧‧‧Line heater

70‧‧‧Magnetic washer

80‧‧‧Frame

81‧‧‧ components

82‧‧‧ components

83‧‧‧Washing seat

D1‧‧‧ distance

D2‧‧‧ distance

D3‧‧‧ interval

D4‧‧‧ interval

S1‧‧‧ hollow layer

S2‧‧‧ hollow layer

Claims (8)

A glass door for a refrigerating display cabinet, comprising: a first glass plate disposed outside the cabinet of the refrigerated display case; a second glass plate disposed inside the cabinet of the refrigerating display case; and a third glass plate And the first glass plate and the second glass plate are disposed between the first glass plate and the second glass plate; the outer surface of the first glass plate and the thickness direction of the third glass plate The first distance between the center lines and the second distance between the inner surface of the cabinet of the second glass sheet and the center line of the third glass sheet in the thickness direction are different. The glass door for a refrigerating display case of claim 1, wherein the first distance is greater than the second distance. A glass door for a refrigerating display case according to claim 2, wherein the third glass plate is thinner than the first glass plate and the second glass plate. The glass door for a refrigerating display case according to any one of claims 1 to 3, wherein the first hollow layer, the second glass plate, and the third glass plate between the first glass plate and the third glass plate Helium gas is enclosed in the second hollow layer between them. The glass door for a refrigerating display case according to any one of claims 1 to 4, wherein the first glass plate is a laminated glass in which a pair of glass plates are bonded to each other by an intermediate film containing a resin. The glass door for a refrigerating display case according to any one of claims 1 to 5, wherein the first glass plate is thicker than the second glass plate and the third glass plate. The glass door for a refrigerating display case according to any one of claims 1 to 6, wherein a third distance between a surface of the inside of the first glass plate and a surface of the third glass plate outside the cabinet is 9~ 11mm. The glass door for a display case according to any one of claims 1 to 7, wherein the surface of at least one of the first and second glass sheets is subjected to low-emission coating.