Improved cooling system of a refrigeration unit

Abstract

Cooling system of a refrigerating appliance, in particular a household refrigerating appliance, which has at least one cell in which at least one compartment for storing food below or above the freezing point is located, wherein the compartment is cooled by means of at least one tube-fin evaporator which is arranged next to at least one wall of the cell, characterized in that a thermal insulation material is arranged between a cell (1) and an outer evaporator (8, 10).

Description

[0001] The present invention relates to an improved cooling system of a refrigerating appliance, in particular a household refrigerating appliance, which has at least one cell in which at least one compartment for storing food below or above the freezing point is located, wherein the compartment is cooled by means of at least one tubular finned evaporator which is arranged next to at least one wall of the cell.

[0002] A cooling system for a refrigeration appliance with the aforementioned design is known. For example, in single-cell refrigeration appliances, where one or more compartments are cooled by a finned tube evaporator, the solution involves arranging the evaporator next to a rear wall or under a top wall, thus enabling the storage of food at or above freezing. Also known are designs for refrigeration appliances with two or more cells, in which one of these cells has a finned tube evaporator on the rear wall or under the top wall, which cools one or more cells.

[0003] Cooling appliances with a tubular finned evaporator are often available in a so-called no-frost (anti-frost) version, which means that the appliances are automatically defrosted by means of an electric heater located on or near the tubular finned evaporator, whereby frost or ice formed on the evaporator is automatically melted and then removed from the compartment in a known manner, so that the users of such a cooling appliance do not have to worry about defrosting and removing frost or ice from the compartments.

[0004] With the solutions mentioned, the required cooling capacity of the tubular finned evaporator depends primarily on the size of the cold storage compartment and the required performance of the unit. The cooling capacity of the tubular finned evaporator increases mainly with an increase in its external dimensions. The disadvantage of such an increase in the cooling capacity of a tubular finned evaporator is that it significantly reduces the usable volume for storing food in the compartment in which the tubular finned evaporator is located.

[0005] The cooling capacity of refrigeration systems can also be increased by adding further evaporators of different designs at various locations in or around the unit. The disadvantage of such solutions, especially in no-frost models, is that frost or ice can accumulate on and around the additional evaporators, requiring regular removal by the user. This means that such refrigerators can no longer be considered no-frost.

[0006] The object of the invention is to create an improved cooling system for a refrigeration appliance in order to overcome the disadvantages of known solutions while increasing efficiency and maintaining the user-friendliness of the refrigeration appliance.

[0007] The problem is solved according to the invention by hydraulically connecting a tube-fin evaporator, which is arranged inside a cell of a refrigeration unit, to an external evaporator, which is arranged on the outside of the cell. The external evaporator can have different shapes and can, for example, be designed as a tube evaporator that is wound around the outer circumference of the cell. Another possible embodiment of the external evaporator is a tube-plate evaporator, which is arranged on any side of the cell. A further possible embodiment is in the form of a channel-plate evaporator, i.e., a so-called roll-bond evaporator, which is arranged on any side of the cell. The external evaporator can also be designed as any combination of the three aforementioned shapes.

[0008] The outer evaporator extends completely within a thermal insulation material on the cell. According to the invention, the outer evaporator is arranged on the cell, the cell having been previously encased in the thermal insulation material. Furthermore, the tubular finned evaporator is only attached to the refrigeration unit once it is fully assembled, with the free end of the tubular finned evaporator being hydraulically connected to a free end of the outer evaporator projecting into the interior of the cooling compartment.

[0009] Further features and advantages of the invention will become apparent from the following description of non-limiting embodiments with reference to the accompanying drawings, wherein

[0010] Fig. 1 shows a refrigeration unit with a finned evaporator and an additional external evaporator in the form of a coiled tube and

[0011] Fig. Figure 2 shows a refrigeration unit with a finned evaporator and an additional external tube plate evaporator.

[0012] A refrigeration device according to the invention comprises at least one cell 1 , in whose interior there is at least one cooled room 2 is located. The cell 1 The refrigeration unit is encased in thermal insulation (not shown). Inside the cell 1 The refrigeration unit, preferably in the area of ​​its rear, is a tube-fin evaporator. 3 arranged, which is connected to a breakthrough 6 in the cell 1 running supply pipe 4 is connected to a refrigerant. To increase the efficiency of the refrigeration unit, the cell 1 on their outer side in various ways with at least one external evaporator 8 in the form of a coiled tube 9 surrounded, which is completely within a thermal insulation material of the cell1 runs ( Fig. 1) The evaporator or the pipe 9 hydraulically connected to the finned evaporator 3 in connection, whereby the pipe 9 through a breakthrough 7 in a wall of the cell 1 through the cell 1 through which it is routed, and with a discharge pipe for the refrigerant of the finned evaporator 3 is hydraulically connected.

[0013] In another embodiment, the evaporator is provided to be a plate evaporator. 10 is formed, which is located on an upper outer surface of the cell 1 is arranged ( Fig. 2) Although only one evaporator is described and illustrated in the description and in the drawings, according to the invention an embodiment is also possible in which several identical or different external evaporators are used, which are located on at least one side of the cell 1are arranged. The free end 5 The external evaporator, or a group of several similar or different external evaporators, is each connected either to a compressor or to an evaporator in the other compartment of the refrigeration unit.

[0014] Furthermore, according to the invention, the outer evaporator is arranged such that it surrounds the cell. 1 surrounds, whereby the refrigeration unit is assembled beforehand and a thermal insulation material is applied to the cell. 1 is applied. Similarly, it is intended that the tube-fin evaporator 3 It is only installed in the refrigeration unit once it is fully assembled.

[0015] Furthermore, according to the invention, the external evaporator is located directly on the outside of the cell. 1 arranged. To achieve a more uniform temperature distribution across the cell surfaces and consequently increase the efficiency of the outer evaporator. 8 ,10 to achieve this and to reduce the probability of dew or frost formation on the inner surfaces of the cell 1 In order to reduce emissions in the area of ​​the outer evaporator, the present invention further provides that between the cell 1 and the external evaporator 8 , 10 A material is incorporated that serves as thermal insulation. The thermal insulation is intended to regulate the temperature at the cell walls. 1 to increase the probability of dew or frost formation on the inner surfaces of the cell 1 is reduced.

[0016] In a further embodiment of the invention, between the cell 1 and the outer evaporator is provided with an arrangement of several combined heat-insulating materials to reduce the temperature at the cell surfaces 1 to distribute and increase them more evenly, thereby reducing dew or frost formation on the inner surfaces of the cell.1 is reduced. The composite of thermally insulating materials includes thermally insulating materials with different heat transfer coefficients and / or thermally insulating materials with different thicknesses.

[0017] The embodiments shown in the drawings are not the only possible examples, as they can be implemented differently according to the invention. For example, an embodiment is possible in which the tube-plate evaporator 10 or the roll-bond evaporator at the rear of the cell 1 is arranged. The advantage of such an embodiment is that it is not necessary to reduce dew or frost formation, since the inner surfaces of the cell 1 in this area by means of a heater on the finned evaporator 3 be heated. Reference symbol list 1 cell of a refrigeration unit 2 cooled compartment of a refrigeration unit 3-tube finned evaporator 4 Supply pipes for a refrigerant 5 free end of an external evaporator 6. Penetration of a tube through the cell 7. Penetration of a tube through the cell 8 external evaporators 9 Tube of an external evaporator 10 external evaporators

Claims

[1] Cooling system of a refrigerating appliance, in particular a household refrigerating appliance, comprising at least one cell in which at least one compartment for storing foodstuffs is located below or above the freezing point, wherein the compartment is cooled by means of at least one tubular finned evaporator which is arranged next to at least one wall of the cell, characterized by that between a cell ( 1 ) and an external evaporator ( 8 , 10 ) a thermal insulation material is arranged. [2] Cooling system of a refrigeration appliance according to claim 1, characterized by that between a cell ( 1 ) and an external evaporator ( 8 , 10 ) a composite of thermal insulation materials is provided. [3] Cooling system of a refrigeration appliance according to claims 1 and 2, characterized by that the composite of thermal insulation materials has thermal insulation materials with different heat transfer coefficients. [4] Cooling system of a refrigeration appliance according to claims 1 to 3, characterized by that the composite of thermal insulation materials includes thermal insulation materials of different thicknesses. [5] Cooling system of a refrigeration appliance according to any of the preceding claims, characterized by that the external evaporator ( 8 , 10 ) so at the cell ( 1 ) is appropriate to surround it, after the refrigeration unit has been assembled and the thermal insulation material has been applied. [6] Cooling system of a refrigeration appliance according to any of the preceding claims, characterized by that the tube-fin evaporator ( 3 ) is only installed in the refrigeration unit once it is fully assembled.

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