JPH0144993B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a two-tank low temperature refrigerator equipped with two inner boxes and two independent refrigeration cycles.

(b) Prior art Publication of Utility Model Publication No. 56-12553 states that in a case where a foam insulation material such as polyurethane is used between the inner box and the outer box, the wall thickness between the inner and outer boxes is equal to the surrounding wall thickness. A structure of a heat-insulating box is shown in which a board material having cushioning properties, such as cardboard, is fixed to the inner surface of the outer box at a portion where the change occurs rapidly.

According to such a configuration, even if the insulating foam injected between the outer box and the inner box contracts, the plate material expands accordingly and offsets the shrinkage, so that almost no force is applied to the outer box. It does not act or deform. Since a cushioning board material such as cardboard is fixed to the inner surface of the outer box in areas where the wall thickness of the box body changes rapidly, the outer box will not deform even if the insulation material shrinks after foaming or during use of the refrigerator. Therefore, it is possible to provide a box body for a refrigerator, etc., which is excellent in durability and design without causing any damage.

However, in such a configuration, in order to prevent deformation of the outer box due to shrinkage of the foam insulation material, it is necessary to use a plate material with cushioning properties, which not only increases the number of parts but also requires more time and effort to install them. .

In order to solve this drawback, the
As shown in Publication No. 145960, if a part of the high-temperature refrigerant pipe constituting the main condenser is placed in the part facing the inner partition on the back side, a special plate material to prevent deformation of the outer box can be provided. This is a good idea, but if the main condenser that passes the high-temperature gas refrigerant is placed over the entire height and width of the back plate and buried in the insulation material, not only will the heat exchange of the refrigeration cycle deteriorate, but Low-temperature liquid refrigerant is supplied to the cooler that also serves as the inner box of the freezer compartment.
Even when the supply of low-temperature liquid refrigerant to the refrigerator compartment cooler is stopped, high-temperature refrigerant continues to flow through the main condenser, and as a result, heat dissipation from the main condenser is dissipated through the heat insulating material due to heat transfer. The temperature is transmitted to the refrigerator compartment box, and this inner box is gradually heated, which affects the refrigerator compartment temperature. This reduces the time when the liquid refrigerant supply to the refrigerator compartment cooler using the thermocycle is stopped, and reduces the number of times the refrigerator compartment is cooled. Not only did this increase, but the operating time of the compressor also became longer, leading to a situation where it was not possible to save electricity in the refrigeration cycle.

(c) Purpose of the invention The present invention solves the drawbacks of the prior art, and also
The objective is to save power in the two independent refrigeration cycles of a tank-type low-temperature refrigerator.

(d) Structure of the Invention Two inner boxes are arranged side by side with a gap between adjacent side walls facing each other, each defining the inside of the refrigerator, and the two inner boxes are housed. A two-tank low-temperature refrigerator consisting of an outer box forming a space between the two refrigerators, a foam insulation material foamed and filled into the space and the space, and two independent refrigeration cycles that individually cool the insides of both refrigerators. In both of the refrigeration cycles, a high-temperature refrigerant pipe through which a high-temperature gas refrigerant or a high-temperature liquid refrigerant flows is arranged on the inner surface of at least one side wall of the outer box that is orthogonal to the interval, and a part of at least one high-temperature refrigerant pipe is arranged. extends to a portion of the one side wall opposite to the interval.

(E) Embodiments of the Invention Figures 1 to 6 show embodiments of the present invention, and 1 in the figure is a two-tank low-temperature refrigerator such as a freezer case used for selling ice cream and the like over the counter.
A heat insulating wall 5 with a see-through window 2 at the upper front, two transparent doors 3 and 4 on the left and right in the front half of the top, a machine room 6 located below this heat insulating wall, and above the back half of the top of the heat insulating wall. It consists of a storage chamber 7 located at .

The heat insulating wall accommodates two metal inner boxes 10 and 11 that are open at the top and are arranged side by side with an interval L between each other and define refrigerator interiors 8 and 9, and these inner boxes. It consists of a metal outer box 12 with an open top that forms a space M between both inner and outer boxes, and a foamed heat insulating material 13 such as hard polyurethane that is foam-filled into the space M between the inner and outer boxes. As shown in FIGS. 2, 3, and 4, both inner boxes have front, back, left, and
Consisting of the right and bottom walls 10A to 10E and 11A to 11E, coolers 14 and 15 made of meandering low-temperature refrigerant pipes are arranged on the outer peripheral surface of the walls, and a roll bonding method is installed on the rear half of the upper surface. Both plate-shaped auxiliary coolers 16 and 17 are provided. Both inner boxes have right and left walls 10 that are close to each other and face each other.
A suitable number of cylindrical heat insulating spacers 18 made of polystyrene foam or the like and having an adhesive on one of the two faces facing the right wall 10D or the left wall 11C are interposed between D and 11C, that is, the above-mentioned interval L. In this state, a ring-shaped band member 19 such as a stretchable rubber band or aluminum tape with adhesive on one side is placed horizontally on each circumferential wall and the interval except the right and left walls 10D, 11C and both bottom walls 10E, 11E. By cutting and arranging it, it is held by the band-like member and both are held together.

The outer box has a front wall 12A, a back wall 12B whose upper end extends upward from the front wall, and left and right side walls 12C, 1
2D, a bottom wall 12E that gently slopes upward at the rear, and an upper wall 20 that is located directly above the auxiliary cooler, faces the auxiliary cooler across the space, and slopes gently downward at the rear; Meandering high-temperature refrigerant pipes 21 and 22 are arranged on the inner surface of the front wall 12A, that is, on the side surface of the heat insulating material, and extend from both left and right directions toward the center. These high-temperature refrigerant pipes are for passing gas-liquid mixture or liquid refrigerant, and as shown in Figs. Straight line portions 21A to 21D, 2
2A to 22D and three curved parts 21E to 21G, 2
2E to 22G, inlet portions 21H, 22H, and outlet portions 21I, 21I, and at least one curved portion, for example 21E, 21G, is located on the front wall 12A of the outer box, which faces the distance L between the two inner boxes. The central portion or the front wall 1 of the outer box facing the inner box 11
It extends to the right side of 2A. Although not shown,
Both bent portions 21E, 21 of both high temperature refrigerant pipes 21, 22
G, 22E, and 22G may extend to the center of the front wall 12A of the outer box 12 facing the distance L between the inner boxes 10 and 11, and may be arranged so as to overlap in a vertical relationship. As shown in FIG. 2, both of the high-temperature refrigerant pipes are fixed to the inner surface of the front wall 12A of the outer box by, for example, aluminum tape 23, which has good heat conductivity and has adhesive on one side.

The foam insulation material is used for both the inner and outer boxes 10, 11, 12.
The gap L and the space M between the two coolers 14, 15 and the auxiliary coolers 16, 1 are filled with foam.
Effect of radiation cooling from 7 and high temperature refrigerant pipes 21, 2
2 and the influence of heat radiation from the compressor and condenser, which will be described later, the wall thickness is set to X>Y>Z as shown in Fig. 2.
The relationship between

As shown in FIGS. 2 and 5, the machine room 6 includes:
The front wall 12A of the outer wall, both left and right walls 12C, 12
D. A bottom wall 12E, a removable covering member 26 which forms an exhaust passage 24 facing in the vertical direction and an exhaust passage 25 facing in the front-back direction in the upper part and covers the rear opening, and is located at the rear part of the lower surface of the outer box. It is defined by a base 28 forming an intake passage 27 between it and the lower end of the front wall 12A, and two refrigerant compressors 29 and 30 are installed on the base, and refrigerant compressors 29 and 30 are installed on both the front and rear edges of the intake passage. A pair of supports 33 and 34 house two wire tube condensers 31 and 32 that are supported together. Of the two compressors and the two condensers, the compressor 29 and the condenser 31 are connected to the cooler 14 and the auxiliary cooler 1.
6 and high-temperature refrigerant pipe 21, etc., constitute a well-known independent refrigeration cycle to cool one inner box 10,
Further, the compressor 30 and the condenser 32 together with the cooler 15, the auxiliary cooler 17, the high-temperature refrigerant pipe 22, etc. constitute a well-known independent refrigeration cycle to cool the other inner box 11. That is, the low-temperature refrigerator 1 has two independent inner boxes 10 and 11, and is equipped with two systems of refrigeration cycles that cool both inner boxes independently.

The storage chamber 7 also includes a resin shade plate 33 located on the front, an extending portion 12B' of the upper part of the back wall 12B of the outer box located on the back, and a pair of left and right resin side connecting members 34. , 35 and metal ceiling wall 3
6 and the upper wall 20 which is a part of the outer box, and illuminates the inside and outside of the refrigerator 37, such as a straight tube fluorescent lamp.
and a ballast 38 that is part of the lighting circuit for this lighting.
Also, when the transparent doors 3 and 4 are opened, the transparent doors 3 and 4 are stored. A ceiling wall 36 is attached to the connecting members 34 and 35 on both sides.
A beam 39 is installed to prevent deflection in the longitudinal direction and improve the installation strength of the beam, and the above-mentioned lighting is attached along the front side of this beam, and the above-mentioned stabilizer is attached to the back side of this beam.

The connecting members on both sides mainly include the inner and outer boxes 10, 11,
12 opposite left and right side walls 10C, 12C, 1
It connects both 1D and 12D, and as shown in FIGS. 4 and 6, at least one groove 40 for fitting the beam and one side edge of both the transparent doors are placed so as to be movable in the front and back direction. a rail 41 on which the auxiliary coolers are placed, a receiving part 42 on which one side edge of the two auxiliary coolers is placed, a placing part 43 on which one side edge of the upper wall is placed, and a foam heat insulating material 1.
A window 44 through which the transparent door 3 passes and a gutter 45 that receives dew from both the transparent doors are each integrally formed. Reference numeral 46 denotes a central connecting member made of resin, which interconnects and supports the right and left side walls 10D, 11C of both boxes, and the other adjacent edges of both auxiliary coolers 16, 17;
It is arranged directly below the center rail 47 shown in FIG. 1 on which the other adjacent side edges of both transparent doors 3 and 4 are movably placed. 48 is a front connecting member made of resin, which connects the front walls 10A and 11A of both inner boxes and the front wall 12A of the outer box.
and interconnect each other. Reference numeral 49 denotes a back connecting member made of resin, which connects both the auxiliary coolers 16, 17 and the upper wall 20 to each other.

According to such a configuration, both high temperature refrigerant pipes 21 and 22
are arranged on the inner surface of the front wall 12A of the outer box 12 in a perpendicular relation to the distance L between the inner boxes 10 and 11, so the high temperature refrigerant pipes 21 and 22 serve as reinforcing members for the front wall 12A, and the The strength of the wall can be improved, and the front wall 12A can be maintained at a temperature above the dew point by the heat dissipation of the high temperature refrigerant passing through both high temperature refrigerant pipes 21 and 22, thereby preventing dew condensation on the front wall. Since a part of at least one of the two high temperature refrigerant pipes 21 and 22, that is, curved parts 21E and 21G, extends in the part facing the interval L between the front walls 12A of 12, that is, in the central part, this curved part The strength of the central portion of the front wall 12A can be improved by this, and as a result, even if the foamed heat insulating material 13 within the interval L is contracted, the central portion of the front wall 12A will not be deformed. Also, if one of the two refrigeration cycles, for example, the refrigeration cycle of the cooler 14, auxiliary cooler 16, high temperature refrigerant pipe 21, compressor 29, and condenser 31, is stopped due to the thermocycle, the inner box 10 and Since high-temperature refrigerant is not supplied to the high-temperature refrigerant pipes 21 facing each other, the heat dissipation effect from the high-temperature refrigerant pipes 21 gradually weakens, and as a result, the heat dissipated from the high-temperature refrigerant pipes 21 is transferred to the inner box 10 via the foamed heat insulating material 13. There is no heat flow through, and the thermocycle time becomes longer. Furthermore, when the low-temperature refrigerator 1 is installed in a store to sell ice cream or the like, direct sunlight hits the front wall 12A of the outer box 12 for a long time, and the temperature of this front wall increases to the point where both high-temperature refrigerant pipes 21 and 22 In such cases, heat from direct sunlight is conducted from the front wall 12A to both high-temperature refrigerant pipes 21 and 22, and the high-temperature refrigerant passing through these high-temperature refrigerant pipes starts the refrigeration cycle. Since it is absorbed into the foam, secondary foaming of the foamed heat insulating material 13 due to the influence of direct sunlight can be prevented.

(F) Effects of the Invention Since the present invention is configured as described above, the following effects are produced.

Both high-temperature refrigerant pipes can improve the strength of one side wall of the outer box, which is perpendicular to the distance between the inner boxes, and prevent condensation.

By extending a portion of at least one of the high-temperature refrigerant pipes to the part of the side wall of the outer box that faces the gap, the strength of the part of the outer box that faces the gap can be improved, and this part It is possible to avoid deformation due to the shrinkage effect of the foam insulation material.

During the thermocycle of one refrigeration cycle, the heat dissipation effect from one high-temperature refrigerant pipe that faces the inner box whose cooling action has stopped gradually disappears, and the heat flow through the foam insulation weakens, so the high-temperature refrigerant pipe There is no heating of the inner box, the thermocycle time is long, and the power consumption of the refrigeration cycle can be saved.

[Brief explanation of drawings]

The drawings all show an embodiment of the two-tank low-temperature refrigerator of the present invention, and Fig. 1 is an overall front perspective view, and Fig. 2 is Fig. 1A.
-A' sectional view, Fig. 3 is a sectional view taken along line B-B' in Fig. 1, Fig. 4 is a combined perspective view of both inner boxes, Fig. 5 is an overall rear perspective view, and Fig. 6 is a side connecting member. FIG. 10, 11... Inner box, 12... Outer box, 13... Foamed insulation material, 21, 22... High temperature refrigerant pipe, L... Interval, M...
space.

Claims (1)

[Claims] 1. Two inner boxes that are arranged side by side with a gap between side walls that face each other in close proximity and define the inside of the refrigerator, and a space that stores the inner boxes and has a space between the two inner boxes. In a two-tank low-temperature refrigerator consisting of an outer box forming an outer box, a foam insulation material foam-filled in the interval and space, and two independent refrigeration cycles that individually cool the insides of both refrigerators, In both cycles, a high-temperature refrigerant pipe through which a high-temperature gas refrigerant or a high-temperature liquid refrigerant flows is arranged on the inner surface of at least one side wall of the outer box that is orthogonal to the interval, and a part of at least one high-temperature refrigerant pipe is connected to the one side wall. A two-tank low-temperature refrigerator extending in a portion opposite to the above-mentioned interval.