JPH0347190Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is used in physical and chemical laboratories, etc., and is used in cryogenic freezers for semi-permanently preserving blood and biological materials at extremely low temperatures. In particular, it relates to an improved structure of the inner lid that closes the opening.

(b) Conventional technology The recent activation of biotechnology research has also encouraged the development of freezers used to preserve biological materials used in the research, whereas in the past the freezing temperature was limited to -40°C. In contrast, in recent years, cryogenic freezers have been developed that create extremely low temperature environments such as -80°C or even -130°C. That is, such an extremely low temperature prevents the recrystallization of ice within the biological material to be preserved, thereby achieving semi-permanent preservation.

The structure of such a freezer is, for example,
This is shown in Publication No. 90663. As is clear from the configuration shown here, an inner cover, which is also heat-insulating, is provided inside the outer door, which is heat-insulating, and which freely opens and closes the opening of the heat-insulating box that opens upward. This is because the temperature inside the refrigerator is extremely low, and the gasket provided as a sealing material on the inner surface of the outer door cannot prevent cold air from leaking and heat being taken out. temperature is achieved.

(c) Problems that the invention aims to solve This inner cover is constructed by molding a heat insulating material such as styrofoam, but due to its own heat insulating properties, there is a gap between the top and bottom of the inner cover, that is, the inside of the refrigerator and the outer door. Since the temperature difference is about 50°C, deformation due to the temperature difference becomes a problem. This will be explained with reference to FIGS. 5 to 7. The figure shows one using two inner lids. In this way, even if the freezer becomes larger, the inner lid can be easily removed, and the amount of cold air leaking when removed can be reduced.

That is, in FIG. 5, reference numeral 100 denotes a heat insulating box with an upper opening filled with a heat insulating material 101 such as foamed polyurethane, the interior of which is a storage chamber 102, and a stepped portion 103 formed around the edge of the upper opening. 1
04 is an insulating outer door that is rotatably supported on one side of the opening edge of the insulating box 100 and closes the opening so that it can be opened and closed, and a seal is placed around the inner surface of the door to seal the distance from the opening edge of the insulating box 100. A gasket 105 is attached. Two inner lids 106 and 107 made of expanded polystyrene are located inside the outer door 104. The inner lids 106 and 107 are placed across the stepped portion 103, and when the cooling device is not in operation, their adjacent side surfaces abut against each other to close the opening of the storage chamber 102, as shown in FIG. There is.

With this configuration, a cooling device (not shown) is operated to cool the inside of the storage chamber 102, and when the temperature reaches an extremely low temperature of -130°C, the inner lids 106 and 107 are naturally cooled, so that the temperature shown by the solid line arrow in FIG. As shown in the figure, contraction occurs in the horizontal direction, and a gap D is created between the adjacent side surfaces, causing cool air to leak as shown by the broken line arrow in the figure. Moreover, the surface of the storage chamber 102 side of the inner lids 106 and 107 and the outer lid 1
As mentioned above, the temperature difference between the surfaces on the 04 side reaches as much as 50°C, so the amount of shrinkage is also different, and the amount of shrinkage on the storage chamber 102 side is larger, so that the inner lids 106 and 107 are closed as shown by the solid line arrows in FIG. Each of them is deformed to warp upward, and gaps D and D are created not only between each other but also at the center of each, and as shown by the broken line arrow, the storage chamber 10
There was a problem that the cooling capacity decreased due to the exchange of air between the inside and outside, making it impossible to achieve the target temperature.

(d) Means for solving the problem In order to solve the problem, the present invention provides a plurality of inner lids 13 and 14 inside the storage chamber 3 of the outer door 7 of the cryogenic freezer 1, and The lids 13 and 14 are made of heat insulating plates, and the inner lids 13 and 14 have projecting portions 15 on adjacent side surfaces that overlap each other vertically.
16, and protrusions 17 and 18 which protrude upward from the upper surface and come into contact with the inner surface of the outer door 7 are formed.

(e) Effect: According to the present invention, it is possible to eliminate the gap caused by the horizontal contraction of the inner cover, prevent warping and deformation, and prevent cold air from leaking.

(F) Example Next, an example will be described with reference to FIGS. 1 to 4. FIG. 1 shows a top sectional view of the cryogenic freezer 1, and FIG. 2 shows a perspective view of the cryogenic freezer 1 to which the present application is applied. Incidentally, in FIG. 2, the inner cover, which will be described later, is excluded. 2 is a heat insulating box body with a storage chamber 3 inside, a heat insulating material 4 such as foamed polyurethane filled between the constituent walls, and opening upward, and a stepped part 5 falling downward is formed at the periphery of the upper opening. ing. An outer door 7 is rotatably supported at the rear of the opening edge of the heat insulating box 2 by hinges 6, 6, and closes the opening of the heat insulating box 2 in an openable and closable manner. The outer door 7 also has a heat insulating material 8 inside, and a gasket 9 as a sealing material is attached around the inner surface of the heat insulating box 2.
Seal between the opening edge and the opening edge. A handle 10 is attached to the front side of the outer door 7 so as to be rotatable at a predetermined angle, and a latch receiver 11 is provided on the front surface of the insulating box body 2. When the outer door 7 is closed, the handle 10 is attached to the latch receiver 11. engage. A machine room 12 is formed on the side of the heat insulating box 2 to house a cooling device.

Reference numerals 13 and 14 designate two inner covers each made of a heat insulating material such as styrofoam formed into plate shapes, and are located below the inner plate 7a of the outer door 7, and their edges are attached to the stepped portion 5 of the heat insulating box 2. They are placed and supported in parallel. Inner lid 1
The lower half of the side surface on the inner lid 14 side of No. 3, that is, the adjacent side surface, overhangs laterally over its entire length to form the overhang portion 1.
5 is formed, and furthermore, the upper half of the side surface of the inner cover 14 on the inner cover 13 side extends laterally over its entire length to form a projecting portion 16. This overhang 16,1
5 overlap each other vertically, and when the cooling device is not in operation, the overhanging portion 15 is in contact with the side surface of the inner lid 14 on the lower side of the overhanging portion 16, and the overhanging portion 16 is also in contact with the side surface of the inner lid 14 on the lower side of the overhanging portion 16.
It is in contact with the side surface of the upper inner edge 13, that is, both inner covers 13 and 14 are provided in close contact with each other. Also, inner lid 1
Projections 17 and 18 as handles are formed upright from the upper surfaces of 3 and 14, respectively, and these projections 17 and 18 are dimensioned so that they abut against the inner plate 7a when the outer door 7 is closed. If the handle also serves as a handle in this way, there is no need to provide a special handle structure.

FIG. 3 shows a sectional view taken along the line A--A in FIG. A cooling pipe 20 included in the cooling device is wound around the heat insulating material 4 side of the inner wall of the heat insulating box 2 and arranged in an exothermic manner. Inside storage room 3 is -130
Cooled to ℃. Due to such extremely low temperatures, the inner lids 13 and 14 first contract as indicated by the solid line arrows in FIG. 4, so that a horizontal gap D, D is created between the inner lids 13 and 14. However, the overhanging portion 15,
Since the upper and lower surfaces of the inner lids 16 are in close contact with each other, no cold air leaks from between the inner lids 13 and 14.
Furthermore, since the protrusions 17 and 18 are in contact with the inner plate 7a of the outer door 7, the inner lids 13 and 14 cannot warp upward, so the warp deformation as described above does not occur.
There is no gap in the center of each,
Cold air leakage can be reliably prevented.

Note that the protruding margins of the inner lids 13, 14 and the protruding portions 15, 16 are set in consideration of the degree of contraction of the inner lids 13, 14 so that they always overlap vertically even if they are contracted. or,
Although two inner lids are shown in the embodiment, the present application is not limited to this, and the present application is also effective in a case with a larger number of inner lids.

(G) Effects of the invention According to the invention, since the inner lid is divided into multiple parts, it is easy to handle even if the freezer becomes large, and even if the inner lid shrinks horizontally due to extremely low temperatures in the storage room. Since the protrusions located on adjacent side surfaces overlap each other, there is no gap between the inner lids and leakage of cold air is prevented. Furthermore, since the protrusion prevents the inner cover from warping upward, it also reliably prevents cold air from leaking around the inner cover, and by improving cooling efficiency, it is possible to achieve even lower temperatures. It is.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present application, and the first
The figure is a sectional view of the top of the cryogenic freezer, Figure 2 is a perspective view of the same, Figure 3 is a sectional view taken along line A-A in Figure 1, and Figure 4 corresponds to Figure 1 when the cooling device is in operation. FIG. 5 is a sectional view of a cryogenic freezer, and FIGS. 5 to 7 show the conventional structure, FIG. 5 is a sectional view of the upper part of this type of freezer, and FIGS. It is a figure which shows the deformation|transformation of the inner lid of. 3...Storage room, 7...Outer door, 13, 14...Inner lid, 15, 16...Protrusion, 17, 18...Protrusion.

Claims (1)

[Scope of utility model registration request] The opening of the insulating box body, which has an interior as a storage room and opens upward, is freely closed and closed with an insulating outer door, and a plurality of inner lids made of insulating plates are provided on the inside of the storage chamber of the outer door. In the cryogenic freezer provided, the inner lid has protruding portions that overlap each other vertically on adjacent side surfaces, and a protruding portion that protrudes upward from the upper surface and abuts the inner surface of the outer door. A cryogenic freezer featuring