JPH02247475A - Low-temperature case - Google Patents

Abstract

PURPOSE:To prevent condensed dew from forming on a frame surrounding the door of the title case during the closing of the door by providing a packing and a packing holder so as to extend over the in-case surfaces of a glass frame made of resin, which covers each end portion of the front and rear surfaces of a double-layer transparent glass sheet and the side surfaces thereof, and a door frame made of metal, which covers the surrounding parts of the glass sheet. CONSTITUTION:A transparent door 11 is provided with a double-layer transparent glass sheet 51 and a frame body 55 covering the surrounding parts thereof, and the frame body 55 consists of a glass frame 57 made of resin such as hard vinyl chlorides and a door frame 58 made of metal such as aluminum, while a packing 56 is fixed on the in-case surface of the frame body 55 by means of a flexible packing holder 63 secured so as to extend over the in-case surfaces of both glass frame 57 and door frame 58. Accordingly, the in-case wall of the door frame 58 is not directly cooled by cold air in a storage chamber with the aid of both one end side of the packing holder 63 and the packing 36. Therefore, even if the door frame 58 is made of metal, condensed dew can be prevented from forming on the out-case wall of the door frame 58. In addition, the structural strength of the door can be increased.

Description

[Detailed Description of the Invention] [Object of the Invention] Industrial Application Field The present invention relates to improvement of a transparent door, and more specifically, a low-temperature refrigerator having a transparent door that prevents dew condensation from forming on the metal door frame. Regarding.

In the conventional technique, an opening is formed and the opening is closed by a rotatably held door, and Japanese Utility Model Publication No. 8632/1986 discloses a door frame made of metal. The door in this publication is composed of a transparent body such as glass and a surrounding frame that fits the west end face of the transparent body through a glass frame, and is attached to the inner side of the surrounding frame through a mounting member. A gasket with magnet is attached. Therefore, when the door is closed,
The end of the inner side surface of the surrounding frame is exposed to the cold air circulating inside the refrigerator.

Problems to be Solved by the Invention In the above-mentioned conventional publication, since the internal side surfaces of the surrounding frame disposed around the transparent door (four end faces) are exposed to the cold air inside the refrigerator, this surrounding frame If the refrigerator is made of metal, the heat transfer will also cool the outer surface of the surrounding frame, causing dew condensation to form on the outer surface of the refrigerator and causing dew droplets to fall from the door when the door opens and closes. Ta. If this surrounding frame were made of resin, this problem of condensation would be eliminated, but the door would have to be made quite sturdy considering the structural strength of the door due to its size and weight. First, not only does the door itself become larger, but the thickness of the surrounding frame is considerably thicker than that of a metal one compared to the thickness of the transparent body, which increases the thickness of the door and creates an apparent vertical imbalance. was there.

Therefore, in the present invention, when the surrounding frame of the transparent door is made of metal, it is possible to prevent dew condensation from forming on the surrounding frame when the door is closed, and to prevent dew droplets from falling around the low-temperature refrigerator. Take it as a challenge.

[Structure of the invention]

Means for Solving the Problems The present invention provides a low-temperature refrigerator having a transparent door that is rotatably attached to a heat insulating box body having an opening formed in the front surface and defines a storage room together with the box body when the opening is closed. The transparent door consists of a resin glass frame arranged in an annular shape to cover the front and back edges and sides of double-layer transparent glass, and a resin glass frame that covers the surface of the glass frame. A metal door frame is arranged in an annular manner so as to cover the periphery of the glass frame, and the metal door frame has an abutting part that makes contact with the glass frame. A fixing member that
It consists of a packing holder, one end of which is fixed to the inner surface of the glass frame and the other end of which straddles the inner surface of the door frame, and a flexible annular packing attached to the packing holder. When the door is closed 1. This prevents the door frame from being exposed to the cold air in the storage room.

Function When the opening 3 is closed with the transparent door 11, the metal door frame 58 is connected to the glass frame 57 and the packing holder 63.
Since the end portion of the internal wall 74 of the refrigerator is covered by one end side and the packing 56, the internal wall of the door frame 58 is not directly exposed to the cold air of the storage room, and therefore is not easily affected by the cold air. None, the temperature drop of the door frame 58 is suppressed as much as possible, and the moisture contained in the air outside the refrigerator is cooled by the door frame 58 and is prevented from becoming dew and adhering to the door frame surface.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

Reference numeral 1 refers to an upper case 4 consisting of an insulating wall 3 with an opening 2 for storing and taking out products on the front surface, and a lower case consisting of an insulating wall 6 with an opening 5 for storing and taking out products on the top surface. This low-temperature refrigerator is a typical example of a so-called dual type showcase whose main body is made up of 7 and 7.

The upper case 4 includes two transparent doors 11 on the front side of the heat insulating wall 3, each of which has one side rotatably supported by a pair of upper and lower hinges 1o, and has a handle 11A that closes the opening 2 at will.
A storage room (in this example, for freezing) is provided with a metal partition plate 12 and a bottom plate 13 at appropriate intervals from the inner surface of the storage wall 3, and is equipped with a plurality of shelves 14 and a fluorescent lamp 15 as a lighting device. A cold air passage 19 formed by the partition plate 12, the bottom plate 13, and the heat insulating wall 3 is installed, and a plate fin type cooler 17 and a blower 1B are installed. A blowout port 20 and a suction port 21 are formed facing toward each other.

Then, by forcedly circulating the air (this is called cold air) heat-exchanged in the cooler 17 as shown by the arrow using the blower 18, the air is forced to circulate along the back surface of the transparent door 11 from the Suita exit 2o toward the suction port 21. The storage chamber 16 is cooled by forming a flowing cold air stream or air curtain.

The heat insulating wall 3 is made of metal, e.g., hot-dip galvanized steel, with an open front and an inner box 30 that is made of metal, e.g., hot-dip galvanized steel, and an inner box 30 that accommodates the inner box with an appropriate space between the inner box 3o and the inner box 3o. A square foam insulation material 32 made of hard polyurethane or the like is foamed and filled into the space of a box body composed of an outer box 31 made of a steel plate and a resin breaker that connects both boxes in an insulating manner.

40 is a machine room formed at the lower part of the heat insulating wall 6, in which the plate fin type cooler 17 of the upper case 4, the first compressor 41 and the first condenser 42 that constitute the refrigeration cycle, and the main A second compressor and a second condenser (not shown because they are hidden behind the first compressor 41 and condenser 42, respectively) that constitute the refrigeration cycle with the auxiliary cooler 25 and 26 are installed respectively. are doing.

Next, the structure of the transparent door 11 will be explained.

The transparent door 11 includes a multilayer (three layers in this example) transparent glass 51 formed with heat insulation in mind, and the surrounding area of the transparent glass 51 (
That is, a frame 55 arranged in an annular shape so as to cover the front end 52, the back end 53, and the side surface 54, respectively;
A flexible annular packing 56 is disposed on the inner surface of the frame 55 and absorbs the impact when the door 11 is opened/closed, and maintains airtightness between the door and the heat insulating wall 3.

The frame 55 is arranged around the transparent glass 51, that is, at the surface end 5.
2. A glass frame 57 made of hard vinyl chloride, etc., disposed so as to cover the back end 53 and the side surface 54, respectively;
It consists of a door frame 58 made of metal such as aluminum, which has a contact part 59 that comes into contact with the surface of the glass frame 57, and is arranged in an annular manner so as to cover the periphery of the glass frame 57.
When fixing the transparent glass 51 with the glass plate 7 disposed thereon to the door frame 5B, the contact portion 59 that comes into contact with the surface of the glass frame 57
A fixing member 60 that clamps the transparent glass 51 together with
is fixed to the door frame so as to straddle the inner surface of the door frame 58 and the inner surface of the glass frame 57.

One end is locked to a locking piece 61 formed on the inner surface of the refrigerator of the glass frame 57, and a hooking piece 6 formed on the inner surface of the door frame 58
A flexible packing holder 63 whose other end is hooked to 2
The packing 56 is fixed to the inner surface of the frame body 55 via. A dovetail groove 64 is formed in this packing holder 63, and an arrow-shaped part 65 as a mounting part of the packing 56 is fitted into this dovetail groove 64. The packing holder becomes difficult to bend due to the force applied when it is attached to the packing holder 63, and the problem of difficulty in attaching the arrow-shaped portion 65 due to the packing holder being easily bent is eliminated. Further, the packing 56 has a magnet portion 66 formed in a portion that comes into contact with the heat insulating wall 3, and a shock absorbing portion 67 between the magnet portion 66 and the arrow-shaped portion 65.

Note that the glass frame 57 has a front surface 52 and a back surface 5 of the transparent glass 51.
3. Consists of a front surface part 68, a back surface part 69, and a side surface part 70 corresponding to the side surface 54, and a stepped part 71 is formed on the inner surface of the intersecting part to form a space P between the side surface part 70 and the transparent glass side surface. That's how it is. Further, the door frame 58 is a glass frame 57
In order to form a heat insulating space Q on the outside of the side wall 70 of
2. A dovetail groove 76 consisting of a side wall 73, an inner wall 74, and a regulating protrusion 75, 75 is provided, and the contact portion 59 extends from the outer wall 72 inward (toward the transparent glass side). . A heater 77 for preventing dew condensation is provided on the inner surface of the side wall 73, and a heat insulating material 78 is provided in the dovetail groove 76 to prevent heat from being transmitted to the glass frame 57 when the heater is energized. The effect of preventing dew condensation may be improved.

With these configurations, the internal wall 74 of the door frame 58 can be isolated from the cold air in the storage room 16 by the surface portion 69 of the glass frame 57, one end side of the packing holder 63, and the packing 56, and can be directly cooled by the cold air. Therefore, even if the refrigerator is made of metal, the outer wall 72 and side wall 73
This prevents condensation from forming.

Here, the packing holder 63 is in a state in which the locking claw 80 formed at one end of the holder is locked to the locking piece 61 formed on the back surface 69 of the glass frame 57 (the state shown in FIG. 4, ■).
Using the flexibility of the holder 63, the other end can be hung 8
1 is bent so as to exceed the hanging piece 62 of the door frame 58 (the state shown in Figure 4 ■), and the hanging piece 62 is pushed in the direction shown in Figure 4 ■ so that the hanging wind 81 is caught on the hanging piece 62. The holder can be fixed to the inner surface of the refrigerator of the frame body 55 constituted by the door frame 58 and the glass frame 57 with one touch without using fixing tools such as screws.

By configuring the present invention as described above, the door frame 58 of the transparent door is not directly exposed to cold air inside the refrigerator when the door is closed, so dew can be prevented from forming on the door frame 58 when the door is closed, and the door can be opened easily. At times, dew drops can be prevented from falling. Also,
Since a heat insulating layer is formed by the heat insulating material 78 and the space P between the door frame 58 and the side surface 54 of the transparent glass, heat transfer from the glass is also alleviated, making it difficult for the door frame 58 to be cooled. . Further, since the packing holder 63 is fixed in one-touch by fitting, no fixing tools such as screws are required for attaching and detaching the packing holder 63, and assembly work, inspection and replacement work can be easily performed. By forming the dovetail groove 64 in the packing holder 63, the six walls of the dovetail groove 64 work to prevent the fixed packing holder itself from bending, and the packing 56
This eliminates the problem that the holder bends and is difficult to fix when it is fixed.

〔Effect of the invention〕

As detailed above, according to the present invention, the interior wall of the metal door frame is prevented from coming into contact with the air in the storage room by the glass frame, packing holder, and packing.
The storage room is not exposed to the cold air and is not cooled by the cold air, and the outside air in contact with the outside walls and side walls of the storage room is hardly cooled, so that moisture in the air does not form as condensation on these surfaces. can.

[BRIEF DESCRIPTION OF THE DRAWINGS] Each figure shows an embodiment of the present invention. FIG. 1 is an enlarged sectional view of section B in FIG. 3, FIG. 2 is an external perspective view of a low-temperature refrigerator, and FIG. The AA sectional view in the figure and FIG. 4 are explanatory views when fixing to the frame of the packing holder. 1...Low temperature storage, 2...Opening, 11...Transparent door, 16...Storage room, 51...Double layer transparent glass,
52...Front surface, 53...Back surface, 54...Side surface, 56...Packing, 57...Glass frame,
58... Door frame, 59... Contact portion, 60... Fixing member, 63... Packing holder

Claims (1)

[Claims] 1. In a low-temperature refrigerator having a transparent door that is rotatably attached to an insulated box with an opening formed in the front and closes the opening and defines a storage room together with the box, the transparent door is made of double-layer transparent glass. A glass frame made of resin is arranged in an annular manner so as to cover each end of the front and back surfaces as well as the side surfaces, and a contact portion that comes into contact with the surface of the glass frame covers the periphery of the glass frame. a metal door frame arranged in an annular shape, a fixing member fixed to the door frame and working together with the abutment part to hold the double-layer transparent glass with a glass frame; A packing holder fixed to the inner surface so that the other end thereof straddles the inner surface of the refrigerator of the door frame, and a flexible annular packing attached to the packing holder, and when the transparent door is closed, A low-temperature refrigerator characterized by a door frame that is not exposed to the cold air of the storage room.