JP2020112323A - Refrigerating apparatus - Google Patents

Abstract

To provide a refrigerating apparatus enabling appropriate heat exchange amount between a skin condenser and an evaporator.SOLUTION: A refrigerating apparatus according to the present invention includes: an inner casing having an opened front side and including a ceiling plate, a bottom plate, a back plate and a pair of side plates; an outer casing surrounding the upper, lower, left and right sides of the inner casing; an evaporator having back side heat absorbing piping arranged along the back plate; a skin condenser having a plate part opposed to the back plate and heat radiation piping along the plate part and covering the back plate; and a heat insulation material disposed between the back plate and the skin condenser. In back view, the back side heat absorbing piping and the heat radiation piping are not overlapped with each other.SELECTED DRAWING: Figure 6

Description

The present invention relates to a refrigeration system.

For example, as disclosed in Patent Document 1, a refrigeration apparatus including a refrigerant circuit including a compressor, a skin condenser that is a kind of condenser, a throttle device, an evaporator, and the like has been conventionally used. Refrigerant circulates in the refrigerant circuit.

The skin capacitor covers the inner box forming the heat insulating box together with the outer box forming the heat insulating box. The inner box is cooled by the refrigerant flowing in the evaporator. That is, the skin condenser and the evaporator are arranged on the outer side and the inner side of the heat insulating box, respectively, and are in a state of being adjacent to each other via the heat insulating material.

JP 2001-296075 A

Naturally, the refrigerant flowing in the skin condenser and the refrigerant flowing in the evaporator are at different stages in the refrigerant circuit and have different temperatures. Therefore, unless the heat flow between the refrigerant flowing in the skin condenser and the refrigerant flowing in the evaporator is appropriate, the refrigerant circuit cannot exhibit the expected performance.

It is an object of the present invention to provide a refrigerating apparatus having a proper heat insulation between the skin condenser and the evaporator.

The refrigerating apparatus according to the present invention has an inner box having an opening on the front side and having a ceiling plate, a bottom plate, a back plate and a pair of side plates, an outer box surrounding the upper, lower, left and right sides of the inner box and arranged along the back plate An evaporator having a back side heat absorption pipe, a plate portion facing the back plate and a heat radiation pipe extending along the plate portion, and a skin capacitor covering the back plate, the back plate and the skin capacitor. And a heat insulating material disposed between the heat absorbing pipes and the heat radiating pipes do not overlap with each other when viewed from the rear.

According to the present invention, it is possible to provide a refrigeration system in which heat insulation between the skin condenser and the evaporator is appropriate.

The perspective view of the refrigerating device concerning one embodiment. The disassembled schematic diagram of the refrigerating device which concerns on one Embodiment. The circuit diagram of a refrigerant circuit. The front view of a skin capacitor. The back side perspective schematic diagram of the refrigerating device concerning one embodiment. The longitudinal cross-sectional schematic diagram of the refrigerating device which concerns on one Embodiment. The rear side perspective schematic diagram of the refrigerating device concerning other embodiments.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment described below is an example, and the present invention is not limited to this embodiment.

FIG. 1 is a perspective view of a refrigerating apparatus 1 according to the present invention as viewed from diagonally above the front side. The refrigeration apparatus 1 is, for example, a medical freezer in which the internal temperature of the storage is -20°C or lower.

The refrigeration system 1 includes an outer box 10. The outer case 10 has a ceiling board 11 of the outer case, a left side plate 12 of the outer case, a right side plate 13 of the outer case, and a bottom plate 14 of the outer case. Two doors, that is, an upper door 15 and a lower door 16 are attached to the front side of the outer box 10 via hinges (not shown). The user can access the storage provided in the refrigeration system 1 by opening these doors.

Below the refrigeration system 1, there is provided a machine storage section 17 for storing various machines that form a refrigerant circuit or the like described later.

FIG. 2 is an exploded schematic diagram showing a state in which the refrigeration system 1 is disassembled. As the main parts constituting the appearance of the refrigeration system 1, in addition to the outer case 10 described above, the inner case 20 arranged inside the outer case 10 and the skin condenser 32 attached to the back side of the outer case 10 are included. is there.

The inner box 20 includes a ceiling plate 21 of the inner box, a left side plate 22 of the inner box, a right side plate 23 of the inner box, a bottom plate 24 of the inner box, a back plate 25 of the inner box, and a shelf plate 26. The shelf plate 26 is arranged inside a storage box surrounded by the inner box 20.

The inner case 20 is covered with the outer case 10 and the skin condenser 32. Specifically, the ceiling plate 21 of the inner box, the left side plate 22 of the inner box, the right side plate 23 of the inner box, the bottom plate 24 of the inner box, and the back plate 25 of the inner box are respectively the ceiling plate 11 of the outer box. , The left side plate 12 of the outer case, the right side plate 13 of the outer case, the bottom plate 14 of the outer case, and the skin condenser 32.

FIG. 3 is a circuit diagram of the refrigerant circuit 30 included in the refrigeration system 1. The main devices constituting the refrigerant circuit 30 are the compressor 31, the skin condenser 32, the expansion device 33, and the evaporator 34. In addition to these devices, a frame pipe may be arranged between the compressor 31 and the skin condenser 32, or a dehydrator may be arranged between the skin condenser 32 and the expansion device 33. ..

The compressor 31 and the expansion device 33 that form the refrigerant circuit 30 are arranged, for example, in the machine storage unit 17. The skin capacitor 32 is attached to the back surface side of the outer box 10 as described above. Further, the evaporator 34 is attached to the inner box 20. The specific arrangement of the evaporator 34 will be described later.

FIG. 4 is a front view of the skin capacitor 32. The skin capacitor 32 includes a plate portion 321 and a heat radiation pipe 322.

The plate portion 321 is a member that surrounds the space in which the inner case 20 is arranged together with the outer case 10, and the shape and size thereof are substantially the same as the shape and size of the outer case 10 viewed from the back side. The plate portion 321 is formed of a metal plate having a thickness of about several mm.

The heat dissipation pipe 322 has a horizontal heat dissipation pipe 322A extending in the horizontal direction and a bent heat dissipation pipe 322B connecting the horizontal heat dissipation pipes 322A. The horizontal heat dissipation pipe 322A and the bent heat dissipation pipe 322B form a meandering shape. The heat dissipation pipe 322 further has a vertical heat dissipation pipe 322C connected to both ends of the meandering shape. The lower end of the vertical heat radiation pipe 322C is connected to a device that constitutes the refrigerant circuit 30 arranged in the machine housing portion 17.

The heat radiation pipe 322 is a pipe made of metal, and is attached so as to be in close contact with the plate portion 321. Therefore, the heat of the refrigerant flowing through the heat dissipation pipe 322 is radiated to the air outside the refrigeration apparatus 1 via the plate portion 321. Since the plate portion 321 has a large surface area, heat is effectively released.

The heat dissipation pipe 322 may be configured by a groove formed by pressing the plate portion 321 and a plate that covers the groove.

FIG. 5 is a schematic perspective view of the inside of the refrigeration apparatus 1 as viewed from diagonally above the back side. In FIG. 5, the heat dissipation pipe 322 that constitutes the skin capacitor 32 is shown by a thick line. Further, in FIG. 5, the inner box 20 is shown by a dotted line. Further, in FIG. 5, the evaporator 34 is shown by a solid line. Note that, in FIG. 5, the corner portions of the various pipes are shown bent at right angles for convenience, but in reality, the various pipes are bent by the R portion having a certain radius of curvature (the heat radiation pipe 322). Refer to Fig. 4).

As shown in FIG. 5, the evaporator 34 is arranged along the back plate 25 of the inner box, the left side plate 22 of the inner box, and the right side plate 23 of the inner box. Specifically, it is composed of a plurality of horizontal pipes and a plurality of connecting pipes connecting them. The horizontal pipe extends from the left side plate 22 of the inner box to the right side plate 23 of the inner box through the back plate 25 of the inner box, folded twice 90 degrees in the middle. Therefore, the evaporator 34 is composed of a back side heat absorption pipe 341 extending along the back plate 25 of the inner box, and a pair of front side heat absorption pipes 342 extending along the left side plate 22 of the inner box and the right side plate 23 of the inner box. ..

The back-side heat absorption pipe 341 that constitutes the evaporator 34 includes a plurality of (12 in FIG. 5) horizontal heat absorption pipes 341A.

The evaporator 34 configured as described above tightly covers the inner box 20 from three directions. Therefore, heat can be taken from the storage inside the inner box 20 via the inner box 20, that is, the inside of the storage can be cooled.

FIG. 6 is a schematic vertical cross-sectional view showing a cross section cut along a vertical plane passing through the center of the refrigeration apparatus 1 in the left-right direction. It should be noted that the two doors and the machine storage unit 17 are not shown in FIG.

A heat insulating material 40 is arranged between the inner box 20, the outer box 10 and the skin capacitor 32. The heat insulating material 40 is a foamed heat insulating material, and as the foaming agent, for example, HFO (hydrofluoroolefin) is preferably used, and HFO-1233zd(E) (trans-1-chloro-3,3,3-tri) is used. Fluoropropene) is particularly preferred. By using such a substance as the foaming agent, the heat insulating performance of the heat insulating material 40 can be improved, and the thickness of the heat insulating material 40, and thus the depth, height and width of the refrigerating apparatus 1, can be reduced. .. Needless to say, such a substance may be used as the foaming agent of the heat insulating material 40 that fills the inside of the upper door 15 and the lower door 16. For example, the heat insulating material 40 may be foamed using such a substance only in a position such as a back surface portion or a door where thinning and improvement in heat insulating property are required.

As shown in FIG. 6, the horizontal heat absorption pipes 341A forming the evaporator 34 and the horizontal heat radiation pipes 322A forming the skin condenser 32 are alternately arranged at different heights. That is, in the rear view, the horizontal heat absorption pipe 341A and the horizontal heat radiation pipe 322A do not overlap. In other words, the rear heat absorption pipe 341 and the heat radiation pipe 322 do not overlap with each other in the rear view. In other words, the orthographic projections of the plurality of horizontal heat absorption pipes 341A along the back plate 25 of the inner box onto the back plate 25 of the inner box and the meandering pipes (horizontal heat radiation pipe 322A and bent heat radiation pipe 322B) included in the skin capacitor 32. ) Does not overlap the orthographic projection of the inner box on the back plate 25.

Therefore, as compared with the case where the horizontal heat absorbing pipe 341A and the horizontal heat radiating pipe 322A are arranged at the same height, the distance between the horizontal heat absorbing pipe 341A and the horizontal heat radiating pipe 322A is increased without increasing the thickness of the heat insulating material. Can be increased. Therefore, it is possible to prevent excessive heat transfer between the skin condenser 32 and the evaporator 34 without increasing the thickness of the heat insulating material. That is, it is possible to prevent excessive heat exchange between the relatively high temperature refrigerant passing through the skin condenser 32 and the relatively low temperature refrigerant passing through the evaporator 34. You can

Even if the horizontal heat absorbing pipe 341A or the horizontal heat radiating pipe 322A moves while the heat insulating material 40 is being foamed, the two do not come into contact with each other because the distance between them is large. Therefore, it is prevented in advance that heat is excessively transferred from the refrigerant passing through the skin condenser 32 to the refrigerant passing through the evaporator 34, so that the refrigerant circuit 30 cannot exhibit the expected performance or its efficiency is lowered. be able to.

Further, in the present embodiment, the horizontal heat absorption pipe 341A and the horizontal heat radiation pipe 322A overlap each other in a plan view. By arranging the pipes in this way, the thickness of the heat insulating material 40, that is, the depth of the refrigeration apparatus 1 can be reduced. Even if each pipe is arranged in this manner, the horizontal heat absorption pipe 341A and the horizontal heat radiation pipe 322A do not overlap with each other when viewed from the rear, so that a sufficient distance between the horizontal heat absorption pipe 341A and the horizontal heat radiation pipe 322A is secured, Excessive heat exchange between them can be prevented.

The skin condenser 32 uses heat exchange with the surrounding atmosphere via the plate portion 321 and heat exchange with the evaporator 34 via the heat insulating material 40 to allow the inside of the skin condenser 32 to move. The passing refrigerant is being cooled. Therefore, the thickness of the heat insulating material 40 enables the minimum necessary heat exchange between the skin condenser 32 and the evaporator 34 while ensuring the heat insulating performance between the storage in the inner box 20 and the atmosphere. Will be decided. In the present embodiment, the horizontal endothermic pipes 341A and the horizontal heat radiating pipes 322A are alternately arranged at different heights, so that the thickness of the heat insulating material 40 is not increased and the skin condenser 32 and the evaporation are not increased. The amount of heat exchange with the vessel 34 can be easily optimized.

Next, a refrigeration system 1 according to another embodiment will be described with reference to FIG. 7. The refrigeration system 1 according to the present embodiment differs from the refrigeration system 1 according to the previous embodiment in that the inner box 20 has a plurality of shelf plates 26. Further, in the refrigerating apparatus 1 according to the present embodiment, the evaporator 34 includes the ceiling plate 21, the shelf plate 26, the inner box bottom plate 24, and the inner box, which are different from those of the refrigerating apparatus 1 according to the previous embodiment. They are different in that they are arranged along the back plate 25 of the box.

In the present embodiment, the evaporator 34 includes a back-side heat absorption pipe 341 including four pipes extending in the vertical direction and five front-side heat absorption pipes 342. Further, one end of the evaporator 34 is indicated by a black circle in FIG. 7, and extends from this position in the vertical direction downward to the machine storage unit 17 (not shown for convenience of description).

Also in the present embodiment, the rear heat absorbing pipe 341 of the evaporator 34 and the heat radiating pipe 322 of the skin condenser 32 do not overlap each other when viewed from the rear. Therefore, this embodiment also has the same effect as that of the previous embodiment.

The arrangement of the back-side heat absorption pipe 341 of the evaporator 34 and the heat radiation pipe 322 of the skin condenser 32 are not limited to those shown in the above-described embodiments.

For example, in a rear view, a plurality of horizontal heat dissipation pipes 322A included in the skin condenser 32 are arranged between one horizontal heat absorption pipe 341A of the evaporator 34 and another one horizontal heat absorption pipe 341A. Is also good. By doing so, a flexible design of the refrigeration system 1 can be enabled.

Further, when it is desired to further reduce the amount of heat exchange between the evaporator 34 and the skin condenser 32, the back side heat absorption pipe 341 included in the evaporator 34 and the heat radiation pipe 322 included in the skin capacitor 32 are You don't have to overlap. By doing so, it is possible to increase the thickness of the heat insulating material 40 and further reduce the amount of heat exchange between them.

The present invention is suitably used as a refrigeration system.

DESCRIPTION OF SYMBOLS 1 Refrigeration device 10 Outer box 11 Ceiling plate of outer box 12 Left side plate of outer box 13 Right side plate of outer box 14 Bottom plate of outer box 15 Upper door 16 Lower door 17 Machine compartment 20 Inner box 21 Inner box ceiling plate 22 Left side plate of inner box 23 Right side plate of inner box 24 Bottom plate of inner box 25 Back plate of inner box 26 Shelf plate 30 Refrigerant circuit 31 Compressor 32 Skin condenser 321 Plate part 322 Radiating pipe 322A Horizontal radiating pipe 322B Bending radiating pipe 322C Vertical Heat dissipation pipe 33 Throttle device 34 Evaporator 341 Rear heat absorption pipe 341A Horizontal heat absorption pipe 342 Front heat absorption pipe 40 Thermal insulation material

Claims (6)

An inner box having a front side opening, a ceiling plate, a bottom plate, a back plate, and a pair of side plates,
An outer box surrounding the upper, lower, left and right sides of the inner box,
An evaporator having a back-side heat absorption pipe arranged along the back plate,
A skin capacitor having a plate portion facing the back plate and a heat dissipation pipe extending along the plate portion, and covering the back plate;
A heat insulating material disposed between the back plate and the skin capacitor;
In rear view, the rear heat absorption pipe and the heat radiation pipe do not overlap,
Refrigeration equipment. The back side endothermic pipe includes a plurality of horizontal endothermic pipes extending in the horizontal direction,
The heat dissipation pipe includes a plurality of horizontal heat dissipation pipes extending in the horizontal direction,
The refrigeration apparatus according to claim 1. In a rear view, the horizontal heat absorption pipes and the horizontal heat radiation pipes are alternately arranged,
The refrigeration apparatus according to claim 2. In a rear view, a plurality of the horizontal heat dissipation pipes are arranged between the two adjacent horizontal heat absorption pipes,
The refrigeration apparatus according to claim 2 or 3. The evaporator further has a plurality of front heat absorption pipes arranged along the ceiling plate or the bottom plate, or a shelf plate arranged inside the inner box,
The back side heat absorption pipe connects one of the front side heat absorption pipes and another one of the front side heat absorption pipes,
The refrigeration apparatus according to claim 1. In plan view, the back-side heat absorption pipe and the heat radiation pipe overlap,
The refrigerating apparatus according to claim 1.

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