JPH04344087A - Freezing chamber - Google Patents

Abstract

PURPOSE:To cool the inner wall of a freezing chamber almost uniformly by a method wherein the refrigerant pipe leading to an evaporator in a zigzag way is engaged with the grooves formed at predetermined intervals in the heat transfer material constituting a heat dissipating member and the groove side face of the heat dissipating member is brought into contact with the inner surface of the freezing chamber. CONSTITUTION:The laminates constituted of heat cushioning members 6-9 consisting of the material having different heat conductivities are joined together on the rear side of the inner wall 5 of a casing 1 defining a storing room 4 in a freezing chamber extending from its ceiling to the bottom side and the heat dissipating members 10 made of the same material (copper, silver, aluminum, etc.) having the same thickness and having grooves 10a formed therein at predetermined intervals are installed on the laminates with the groove side thereof brought into contact therewith. The grooves 10a are formed into the shape having the bottom of a semicircular cross section and arranged in a zigzag way. In such grooves 10a, is fitted a refrigerant pipe 18 for effecting a cyclic refrigerating operation, along which are provided a compressor 12, a condenser 14, an expansion valve 16, an evaporator (refrigerant pipe) 18 and a receiver 20. In this way the heat generated on cooling is dissipated efficiently and thereafter the inner wall of the freezing chamber is cooled.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to the structure of an indirect cooling type refrigerator in which a refrigerant pipe as an evaporator of a refrigeration cycle is installed on the inner wall of a storage unit, and the structure of the refrigerant pipe has features. be.

0002

[Prior Art] A conventional refrigerator cooling method involves meandering a refrigerant pipe as an evaporator of a refrigeration cycle directly around the outer circumference of the inner wall of a storage compartment that is partitioned by a casing made of a heat insulating material and a door body made of a heat insulating material. Facilities like this are known. The refrigerant pipe was placed in contact with a heat conductive material forming the inner wall of the refrigerator, and was further fixed with adhesive means such as aluminum tape.

0003

[Problems to be Solved by the Invention] However, in the case of such a conventional system, since the internal wall of the refrigerator is directly cooled, only the area in contact with the refrigerant pipe is locally cooled. It was not suitable for uniformly cooling the inside of the refrigerator. There is also the disadvantage that heat transfer efficiency is poor because the refrigerant pipe is in line contact with the internal wall of the refrigerator. Furthermore, if the refrigerator is locally cooled, frost tends to form on the refrigerator, making it unsuitable for use as a high-humidity refrigerator. The present invention has been developed in view of the drawbacks of the prior art, and is a method of developing refrigerant pipes that can uniformly cool the internal walls of the refrigerator without cooling them locally, and that prevents frost from forming on the internal walls of the refrigerator. It is an object of the present invention to provide a refrigerator having a characteristic arrangement structure.

0004

[Means for Solving the Problems] That is, the present invention has a storage chamber partitioned by a casing made of a heat insulating material and a door body made of a heat insulating material, and a compressor, a condenser, an expansion valve, In a refrigerator installed with a meandering refrigerant pipe of an evaporator of a refrigeration cycle connected to an evaporator etc., the refrigerant pipe fits into grooves of a heat diffusion material in which grooves are formed at predetermined intervals in a heat conductive material. This object is achieved by a refrigerator in which the grooved side of the heat diffusion material is brought into contact with the inner wall of the storage chamber or the heat buffer material.

[0005] This object is also achieved by a refrigerator in which a refrigerant pipe fitted into a groove of a heat diffusion material is supported by a material made of a thermally conductive material so as to be in contact with the bottom wall of the groove.

[0006]

[Operation] That is, in the present invention, when the refrigerator is operated, the refrigerant pipe of the refrigeration cycle fitted into the groove of the heat conductive material in the partition wall of the casing cools the heat diffusion material while making surface contact with the groove surface. do. Since the heat diffusion material is made of a material with excellent thermal conductivity, the cooling heat spreads throughout the heat diffusion material,
Furthermore, since the thermal cushioning material is bonded to the thermal diffusion material, the cooling heat is transmitted to the entire thermal cushioning material.

Furthermore, in the second invention, since the refrigerant tube is made of a thermally conductive material and is supported by the groove, the refrigerant tube comes into contact with the groove without any gap, and the supporting means further facilitates heat diffusion. Because heat is conducted through the material, it spreads heat more efficiently.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below according to embodiments shown in the drawings. In FIG. 1, 1 is a box-shaped casing whose inside is filled with a heat insulating material 2 and one end is open. , the partitioned room is defined as a storage room 4.

[0009] Internal wall 5 of the casing 1 that partitions the storage room 4
On the back side (insulating material side) of the (plate material), from the ceiling side to the bottom, there is a thermal buffer material 6 made of a material with poor thermal conductivity such as cork or plastic, and a material with low thermal conductivity and a material with low thermal conductivity. Thermal buffer material 7 has slightly poor thermal conductivity mixed with a high-quality material, Thermal buffer material 8 has slightly good thermal conductivity mixed with the same material, and Thermal buffer material is made of a material with good thermal conductivity such as graphite or metal powder. 9 are joined. These thermal buffer materials 6, 7
, 8, 9 are made of the same material (e.g. copper, silver, aluminum),
The grooves 10a side of the heat diffusion material 10 having the same thickness and grooves 10a at predetermined intervals are joined. This groove 1
0a has a bottom with a semicircular cross section, and the compressor 12, condenser 14, expansion valve 16, and evaporator 18 are installed in this semicircular groove.
(Refrigerant pipe) A refrigerant pipe 18 (having the same outer diameter) of a refrigeration cycle that is cyclically connected to the receiver 20 is fitted. still,
The refrigerant pipe 18 will be installed in a meandering shape. In addition, the refrigerant pipes 18 that are not in contact with the grooves 10a are configured so that the depth of the grooves is deeper than the outer diameter of the refrigerant pipes 18 so as not to directly contact the thermal buffer material (Fig. 4 ).

Next, FIG. 2 shows a second embodiment of the present invention, in which the inner side (insulating material side) of the internal wall 5 of the casing 1 that partitions the storage chamber 4 is made of the same material and has the same thickness. A thermal buffering material 8 made of For example, copper, silver, aluminum) are bonded. In the second embodiment, the interval between the grooves 10a is designed to become narrower from the upstream to the downstream of the refrigerant in the refrigerant pipe in contact with the grooves.

FIG. 3 shows a third embodiment of the present invention, in which the inner side (insulating material side) of the internal wall 5 of the casing 1 that partitions the storage chamber 4 is made of the same material but of different thickness. Thermal buffer materials 6, 7, and 8 are joined to the thermal buffer materials, and refrigerant pipes 18 made of the same material and the same thickness are fitted into the grooves 10a at regular intervals in the manner described above. A heat diffusion material 10 (for example, copper, silver, aluminum) is bonded thereto. In this embodiment, the thicknesses of the thermal buffer materials 6, 7, and 8 are formed to gradually become thinner so that the thermal conductivity of the thermal buffer materials 6, 7, and 8 improves from upstream to downstream of the refrigerant.

In the above-described structure, in the refrigerator according to the first embodiment, half of the refrigerant pipes 18 are in surface contact with the grooves 10a of the heat diffusion material 10, and the heat diffusion material 10 is made of copper, silver or Because it is made of a material such as aluminum, the cooling heat transferred from the refrigerant flowing through the refrigerant pipe is more widely dispersed, and the surface of the heat diffusion material 10 is evenly cooled. Since the thermal diffusion material 10 and the thermal buffer materials 6, 7, 8, and 9 are bonded together, the cooling heat is transferred to the thermal buffer materials 6, 7, 8, and 9, but the thermal buffer materials 6, Since 7, 8, and 9 are made of materials with lower thermal conductivity than the heat diffusing material, the conduction of cooling heat is relaxed and the inner walls of the refrigerator are not cooled significantly. In addition, since the thermal buffer materials 6, 7, 8, and 9 are made of materials with different thermal conductivities from upstream to downstream of the refrigerant pipes (they are arranged so that they gradually improve), the refrigerant pipes are installed at equal intervals. As a result, even if the distribution state of the cooling heat is different, the temperature distribution will be uniform when it reaches the internal wall of the refrigerator. Furthermore, since the depth of the groove 10a is designed to be longer than the outer diameter of the refrigerant pipe 18, the thermal buffer material and the refrigerant pipe do not come into direct contact with each other, and local cooling is prevented.

Next, in the case of the refrigerator of the second embodiment, the thermal buffer material 8 is made of the same material and the same thickness, but the spacing between the refrigerant pipes 18 is adjusted in inverse proportion to the temperature distribution of the refrigerant pipes. Since the groove 10a is provided in the heat diffusion material 10 so as to gradually narrow, the temperature distribution of the heat diffusion material 10 in the state of being dispersed by the heat diffusion material 10 is approximately uniform, and this uniform cooling heat is transferred to the heat diffusion material 10. Since it is transmitted to the internal wall of the storage in a relaxed state by the buffer material 8, the inside of the storage is uniformly cooled.

Further, in the case of the refrigerator of the third embodiment shown in FIG. 3, since the refrigerant pipes are installed at equal intervals, the heat diffusion material 10 can be used to control the temperature distribution of the refrigerant pipes 18 fitted in the grooves 10a. However, the thermal buffer material 8
are made of the same material, and the thickness decreases from upstream to downstream of the refrigerant, so the cooling heat is dispersed and dispersed due to the interaction between the temperature distribution of the heat diffusion material 10 and the thickness of the thermal buffer material. When the temperature is relaxed and reaches the inner wall of the refrigerator, a substantially uniform temperature distribution is achieved.

What is shown in FIG. 4 is the concave groove 1 of the heat diffusion material 10
It is a sectional view showing a state in which a refrigerant pipe 18 is fitted to 0a,
The groove 10a is machined so that the bottom has a semicircular cross section and the same outer diameter as the refrigerant pipe 18, and the refrigerant pipe 18 is fitted into the groove 10a so that approximately half of the pipe is in surface contact. has been done. This refrigerant pipe 18 has a protrusion 1 joined to the heat diffusing material so that no gap is created between the heat diffusing material 10 and the refrigerant pipe 18.
Supported by 0b.

[0016] In this example, the individual thermal buffer materials are made of plates of the same thickness, but the present invention is not limited to this, and if a more uniform temperature distribution is desired, the thermal buffer materials may be made of plates of the same thickness. A plate whose thickness is gradually reduced may also be used. In the example, a case in which a thermal buffer material is provided is shown, but the present invention is not limited to this. If the temperature of the refrigerant pipe 18 is high, the thermal diffusion material and the internal wall of the refrigerator may be directly joined without providing a thermal buffer material. It's okay. Furthermore, in this embodiment, the refrigerant was configured to flow from the ceiling to the bottom of the storage room.
The flow of the refrigerant is not limited to this, and the flow of the refrigerant may be reversed. However, in this case, it is necessary to reverse the arrangement of the thermal buffer material and the arrangement of the refrigerant pipes 18.

[0017]

[Effects] As described above, the refrigerator according to the present invention has
The internal wall of the refrigerator is configured to be indirectly cooled instead of being directly cooled, and the refrigerant pipe that is the evaporator of the refrigeration cycle is brought into surface contact with the heat diffusion material to efficiently disperse cooling heat. Because of the cooling structure, the inner wall of the refrigerator can be cooled almost uniformly. In addition, since the inner walls of the refrigerator can be cooled uniformly, frost is less likely to adhere to the inner walls of the refrigerator, and the inside of the refrigerator can be kept at a high level of humidity. Furthermore, since a predetermined space is provided to prevent direct contact between the refrigerant pipe and the thermal buffer material or the internal wall of the refrigerator, the inside of the refrigerator is not locally cooled.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 3 is a vertical sectional view showing a third embodiment of the present invention.

FIG. 4 is a sectional view showing a state in which a refrigerant pipe is attached to a heat diffusion material.

[Explanation of symbols]

1 Casing 2 Heat insulating material 3 Door body 4 Storage room 5 Internal walls 6, 7, 8, 9 Thermal buffer material 10 Thermal diffusion material 10a Groove 10b Protrusion 12 Compressor 14 Condenser 16 Expansion valve 18 Evaporator (refrigerant pipe) 20
receiver

Claims (2)

[Claims] Claim 1: A refrigeration system comprising a storage chamber partitioned by a casing made of a heat insulating material and a door body made of a heat insulating material, and a compressor, a condenser, an expansion valve, an evaporator, etc. connected in circulation within the partition wall of the casing. In a refrigerator installed with a meandering refrigerant pipe of a cycle evaporator, the refrigerant pipe is fitted into a groove of a heat diffusion material in which grooves are formed at predetermined intervals in a heat conductive material, and the grooves of the heat diffusion material are 1. A refrigerator characterized in that the side having the side thereof is in contact with an inner wall of a storage chamber or a thermal buffer material. [Claim 2] A claim characterized in that the refrigerant pipe fitted into the groove of the heat diffusion material is supported by a material made of a thermally conductive material so as to be in contact with the bottom wall of the groove. Refrigerator according to 1.