Freezer

Abstract

The invention relates to a freezer (1) comprising a housing which has a fixed heat-insulating housing wall assembly consisting of a front wall (10), a rear wall (14), a base wall (12), and two lateral walls (11, 11'). The housing is equipped with a cooling chamber (6) for goods placed therein, said cooling chamber being covered by means of an openable cover, and with a cooling air generating assembly for cooling or deep-freezing said goods, the cooling air generating assembly having an evaporator unit and a channel assembly. For a given outer housing size, the largest possible cooling chamber and an efficient cooling operation are achieved in that the evaporator unit is in the form of a static evaporator having an evaporator tube assembly (3), which is provided, at least in some regions, in or on the surface of the rear wall (14) facing a rear wall channel (200) and / or the surface of the front wall (10) facing a front wall channel (202) and / or the surface of the base wall (12) facing a base wall channel (203).

Description

[0001] freezer

[0002] The invention relates to a freezer with a housing comprising a fixed, heat-insulating housing wall arrangement consisting of a front wall, rear wall, bottom wall and two side walls, in which a cooling compartment for goods placed therein, covered by an openable cover, and a cooling air generation arrangement for cooling or deep-freezing the same are arranged, wherein the cooling air generation arrangement comprises a refrigeration device including an evaporator unit and a cooling air guide arrangement, which has a rear wall channel formed between a heat-insulating outer part and an inner part of the rear wall, a front wall channel formed between a heat-insulating outer part and an inner part of the front wall, and a bottom wall channel formed between a heat-insulating outer part and an inner part of the bottom wall, as well as a fan unit arranged in this channel arrangement for generating a recirculating airflow.

[0003] A chest freezer of this type is described in DE 202 02 158 U1. This known chest freezer, which is particularly suitable for placement in retail premises and for displaying goods to be chilled or frozen, has a housing with a mechanically rigid, heat-insulating housing wall consisting of a front wall (user side), rear wall, bottom wall, and two side walls, which surround a cooling compartment containing the goods to be chilled or frozen. It is provided with a cover on its top that can be opened for removing goods. Air is drawn into the cabinet body containing the housing wall arrangement via a return air duct by means of a fan, cooled in a heat exchanger or evaporator, and supplied to the goods compartment within the cooling compartment via a supply air duct in such a way that it passes over or falls into the goods stored therein.In the illustrated design, the supply air duct is located in the rear wall, the return air duct in the front wall, and the heat exchanger / evaporator and the fan are arranged in the bottom duct. The freezer has at least one glazed front, side, and / or ceiling section with thermally insulating combination glazing that is at least partially transparent.

[0004] A similar chest freezer with a thermally insulating housing wall arrangement surrounding a cooling compartment and a duct arrangement within the housing walls for guiding cooling air is also shown in DE 1 807 044 U. In this case, the housing wall has outer parts made of thermally insulating polystyrene foam, with an upper section of the front wall formed by a glass pane. The refrigeration unit and a fan unit for generating the cooling airflow are located in the base section.

[0005] AT 407 918 B shows a refrigerated display case with parallel side walls, a front wall, a back wall, and a bottom wall. A cooling channel is present only in one side wall and the bottom wall. Cooling coils are arranged in insulated sections of the side walls, the front wall, and the back wall, but not adjacent to the cooling channel. A fan is positioned near one side wall. DE 37 31 989 A1 shows a refrigerated counter in which a cooling channel is arranged in a small lower section of the front wall, a bottom wall, and a back wall, and is equipped with a fan. Cooling coils are not present. It is stated that the transparent front wall should be kept as unobstructed as possible across its entire extent. However, this restricts the effective, refrigerated product space.

[0006] Another chest freezer with a heat-insulating housing wall and an integrated duct system for directing cooling air and cooling a cold storage compartment is shown in DE 188 1541 U. Here, too, the base compartment serves to house the evaporator and the fan for generating the cooling airflow. The air ducts are arranged along the walls with minimal surface area to keep the loss of cold storage space to a minimum. However, some base space is lost because the refrigeration components, including the evaporator, are housed there.

[0007] The applicant is also aware of freezers with static cooling (without a printed document available) in which no recirculated air is supplied via cooling channels in the front and rear walls of the housing. In the freezer with this static cooling system, an evaporator tube assembly is present in the rear wall up to a certain height, and a stacking mark for the height of the goods to be cooled is located below or at most at the level of the evaporator tube assembly or the evaporator wall formed by it in the rear wall area. This allows for deep freezing (designated as L1 in standards) without recirculated air. For normal cooling (standard class MO) and meat cooling (standard class S), this known design includes a fan for air circulation located at the bottom above the machine compartment, which is arranged in the direction of depth.For conventionally designed freezers, it is desirable to provide the largest possible cooling space relative to the size of the housing, while also taking into account that the interior should be as unobstructed a view as possible through transparent upper wall sections of the housing wall arrangement.

[0008] Based on this, the present invention aims to provide a freezer of the type mentioned at the outset, which, in addition to the most efficient operation and reliable cooling properties, also enables a user-friendly design.

[0009] This problem is solved according to the invention in a freezer with the features of claim 1. The evaporator unit is designed as a static evaporator with an evaporator tube arrangement that is located at least partially in or on a surface of the rear wall facing the rear wall channel and / or a surface of the front wall facing the front wall channel and / or a surface of the bottom wall (12) facing the bottom wall channel. Large-area rear wall cooling by means of the rear wall evaporator tube arrangement is particularly advantageous, especially in combination with front wall cooling. Bottom cooling with the bottom evaporator tube arrangement can be omitted, but its additional integration into the cooling system can be advantageous for improving cooling performance.

[0010] The design of the evaporator unit as a static evaporator, with the evaporator tube arrangement extending over a large area on the surface of the housing wall facing the duct arrangement, results in efficient cooling coupling and transfer of cooling capacity within the overlying airflow, thus efficiently cooling or deep-freezing the goods in the cold storage room. This eliminates the need for a relatively space-consuming refrigeration unit with a finned heat exchanger located in the floor or rear wall.In contrast, the static evaporator, with its evaporator tube arrangement located in or on the wall surface of the ductwork, occupies practically no or very little interior space within the housing, and the associated ductwork can be designed to be very flat. This not only ensures efficient transfer of cooling into the circulating airflow but also uniform distribution of the airflow across the entire surface area of ​​the evaporator tube arrangement swept by the airflow, and thus also across the entire cold storage area. Furthermore, even in the event of a failure of the airflow, the static cooling system can maintain sustained cooling of the cold storage area.

[0011] An advantageous embodiment consists in the fact that the area of ​​the rear wall over which the evaporator tube arrangement associated with the rear wall channel extends comprises more than 50%, at least 60%, at least 70%, or at least 80% of the rear wall surface facing the rear wall channel and is predominantly located in the lower part of the rear wall. In particular, the evaporator tube arrangement is present practically over the entire length (x-direction in Fig. 1) and extends from the bottom area to well over 50%, 70%, or 80% of the height of the rear wall, advantageously at least to the height of an upper opening gap of the rear wall channel extending over the length of the rear wall. This results in a particularly high transfer rate of the cooling capacity applied by the refrigeration device into the cooling air.

[0012] The freezer is advantageously designed such that the back wall, the bottom wall, and a lower front wall section have an outer part made of heat-insulating, self-supporting material, which encloses the channel arrangement on the side facing away from the cooling compartment, and an inner part made of a highly thermally conductive, particularly thin-walled, self-supporting material, such as metal, which largely confines the channel arrangement on the side facing the cooling compartment, except for any perforations that may be present. The outer part of the back wall, the bottom wall, the lower front wall section, and the side walls thus form a mechanically rigid, sturdily constructed furniture body.The housing of the freezer, wherein the rear wall, the bottom wall, the lower front wall section, and the side walls (optionally their lower section if their upper section is designed as a transparent upper wall section) may be additionally coated with a thin coating of at most 1 mm, 2 mm, or at most 5 mm, e.g., only partially. The coating is highly thermally conductive, in particular made of metal (e.g., sheet steel, aluminum, copper), to ensure effective heat transfer from a condenser tube assembly located in or on the outer surface of the housing wall assembly to the ambient air. Except for the outer coating, the outer parts of the housing wall assembly are made of a highly thermally insulating material, in particular a plastic material such as rigid foam, e.g., polyurethane foam. The evaporator tube assembly or evaporator tube coils are, for example, made of...The internal components of the housing wall assembly, which define the boundaries of the ductwork towards the cold storage compartment, are arranged on the inside of the highly thermally insulating material, either on or in or near the surface facing the ductwork. These internal components are made of a highly thermally conductive material, particularly metal (such as aluminum, copper, or the like), and are thin-walled (at most 1 mm, 2 mm, 3 mm, or 5 mm thick, preferably with a protective coating). This ensures sufficient inherent stability to support, for example, shelves attached to or suspended from them for goods stored in the cold storage compartment or goods storage area. The perforation in the bottom-side internal component, or in a shelf formed by it, achieves a balanced temperature distribution, thus ensuring that even products not directly in or cooled by the circulating airflow are effectively cooled.Nevertheless, sufficient air circulation is maintained through the floor duct.

[0013] Furthermore, the freezer is advantageously designed in such a way that the area of ​​the lower front wall section over which the evaporator tube assembly associated with the front wall channel extends covers more than 50%, at least 60%, at least 70%, or at least 80% of the area of ​​the lower front wall section facing the front wall channel. Here, too, the evaporator tube assembly advantageously extends practically over the entire length (in the x-direction) of the freezer and borders the bottom area, extending from the bottom over more than 50%, 60%, 70%, or at least 80%, advantageously over the entire height, of the lower front wall section.

[0014] To allow users or customers a good view of the product compartment of the freezer, it is advantageously provided that the front wall includes an upper front wall section made of a transparent material for visually identifying the goods stored in the cold compartment. This section comprises an upper part of the front wall channel, on the side facing away from the cold compartment, a transparent, thermally insulated outer viewing panel, and an inner viewing panel, on the side facing the cold compartment. The outer part of the upper, transparent front wall section is made of a thermally insulated outer viewing panel, the thermal insulation being advantageously formed by a multi-layered, for example, two-layer, or preferably three-layer, glass construction with thermally insulating cavities in between.

[0015] For the air guidance and distribution in the cold room, it is further advantageous that both the rear wall duct and the front wall duct have an opening arrangement extending along its upper edge area for the recirculation of air.

[0016] Contributing to an advantageous airflow within the cold storage compartment is the fact that the opening arrangement at the upper edge of the front wall duct features a hole arrangement at the upper edge of the inner viewing panel. Furthermore, for advantageous cooling airflow and efficient integration of cold air into the recirculated airflow, thus cooling or freezing the cold storage compartment and the stored goods, the recirculated airflow is generated by the fan unit from top to bottom through the rear wall duct, from back to front through the bottom wall duct, and from bottom to top through the front wall duct.

[0017] Another measure advantageous for efficient cooling is the arrangement of a deflecting element for the recirculated airflow at the upper end of the front wall duct, extending along its length and projecting towards the cooling room, in particular obliquely downwards.

[0018] For the design and function, particularly with regard to airflow, it is further advantageous that the fan unit is arranged in the, preferably lower, region of the rear wall duct or in the, preferably rear, region of the bottom wall duct. The fan unit advantageously consists of at least one, preferably at least two, fans, in particular and preferably designed as cross-flow fans extending with their fan axis in the longitudinal direction (x-direction) of the housing.

[0019] A further advantageous design for airflow consists in the fan unit extending with a shaft cover over at least 20%, 50% or 70% of the longitudinal extent of the rear wall duct measured in the longitudinal direction of the housing.

[0020] Further measures that contribute to efficient cooling of the cold room and effective utilization of the cooling capacity include the following: the side walls are also equipped with side wall ducts formed between a heat-insulating outer section and an internal spacer grille or a highly thermally conductive inner section. Cooling air can be supplied to these ducts via a connection point from the bottom wall duct, which can be routed over or through the cold room via a duct at the upper edge of the side wall ducts. However, purely static cooling (i.e., without side wall ducts for cooling airflow) in the side walls, using an evaporator tube arrangement located on the cold room side and also covered with an evaporator plate, is also suitable for effectively supporting the cooling of the cold room.

[0021] For the cooling function, it is further advantageous that the side walls are also provided with an evaporator tube arrangement in or on a surface of the outer part facing the cooling room or the respective side wall channel.

[0022] Several advantageous embodiments of the freezer further consist in the side walls having a lower side wall section with an outer part and a spacer grid arranged internally thereon, in particular directly on an evaporator plate part, or with a highly thermally conductive, thin-walled inner part (also with a spacer grid) defining a respective side wall channel, and an upper side wall section with a heat-insulating outer transparent part and with or without an inner transparent part, wherein the respective side wall channel optionally extends continuously through the lower and upper side wall sections. If the side walls are thus provided with a transparent upper side wall section, the freezer is advantageously suited as the head unit of a refrigerated island with two freezers facing each other at their rear walls.

[0023] Good heat transfer from the refrigeration unit to the ambient air is achieved by the refrigeration unit having a condenser tube assembly arranged externally on or within an outer surface of the housing wall assembly, with thermal conductivity extending outwards to the environment, and by having cooling components located in a machine compartment, particularly in a lower lateral area. A pre-condenser unit may also be arranged in the machine compartment or in the bottom area of ​​the bottom wall facing the outside.

[0024] Further advantageous design features for the construction and use of the freezer include the arrangement of retaining elements for at least one shelf for goods positioned or to be positioned in the cold room on the inside of the housing wall facing the cold room, in particular on the inner parts of the back wall and the front wall.

[0025] For cooling the cold room, it is also advantageous that the inner part of the floor wall is provided with diffusely distributed outlet holes or a diffusely extended perforation to achieve a balanced temperature distribution, at least in the area near the floor of the cold room.

[0026] Insofar as the terms "top" and "bottom" or their variations (such as "bottom side" and "top") are used in this application, they refer to the geodetic installation of the freezer. The terms "front," "back," "side," and their variations (such as "front," "back," and "side walls") refer to the front facing the user, the back facing away from it (in the direction of depth), and the side to the right and left of the user.

[0027] The invention is explained in more detail below with reference to exemplary embodiments and the drawings. The drawings show:

[0028] Fig. 1 shows a first embodiment of a chest freezer, particularly for use in a row arrangement, in a perspective view from an oblique front and top view; Fig. 2 shows a further embodiment of a chest freezer with a side wall modified compared to Fig. 1, particularly for use as an end-mounted chest freezer in an island arrangement, in a perspective view from an oblique front, side and top view.

[0029] Fig. 3 shows a section of a freezer with the cold compartment loaded, in a perspective cross-sectional view from an oblique angle, side, and top.

[0030] Fig. 4 shows a section of a freezer with a view into the cold compartment in a perspective cross-sectional view from an oblique angle, side, and top.

[0031] Fig. 5 shows a cross-section of the freezer according to Fig. 3 with a loaded cooling compartment,

[0032] Fig. 6 shows a section of the freezer according to Fig. 4 in its lower rear area in a perspective cross-sectional view from an oblique front, side, and top view.

[0033] Fig. 7 shows a section of a side of a freezer with a view into the cooling compartment in a perspective longitudinal section from an oblique angle, from above.

[0034] Fig. 8 shows an upper side section of a freezer with a view into the cooling compartment in a perspective cross-sectional view from an oblique angle, above, and

[0035] Fig. 9 shows a side section of a chest freezer with a transparent upper side wall section, looking into the cooling compartment in a perspective longitudinal section from an oblique angle above. Fig. 1 shows a chest freezer 1 in a perspective view with a front wall 10, two side walls 11 (of which only the left one is visible), a (concealed) bottom wall 12, a (concealed) rear wall 14, and a top cover 13, which can be opened to access a cooling compartment inside the chest freezer 1 (not visible here) or goods arranged therein. The front wall 10, side walls 11, bottom wall 12, and rear wall 14 form a wall assembly of a housing for the chest freezer 1, which is closed at the top by the top cover 13. The top cover has sliding panels that can be opened, for example, from the front to the back or to the side.The housing of the freezer 1 rests on feet at its base and has a cuboid shape, with the front wall 10 and the parallel rear wall 14 extending horizontally in the x-direction and vertically in the z-direction (with respect to the direction of gravity or geodesically) along their longitudinal sides, and the side walls 11, bottom wall 12, and top extending in depth in the y-direction. The front wall 10 has a preferably opaque lower front wall section 100 and an adjoining transparent upper front wall section 101.

[0036] Fig. 2 shows a further embodiment of a freezer 1, which differs from the embodiment shown in Fig. 1 in that the two side walls 1T, like the front wall 10, have an opaque lower side wall section 110 and an adjoining upper side wall section 111. The remaining wall areas are designed according to the embodiment of Fig. 1. The embodiment of Fig. 2 is particularly suitable as an end-mounted freezer in an island arrangement with two freezers 1 according to Fig. 1 placed against each other with their rear walls 14, wherein the length of the end-mounted freezer 1 (and advantageously also of the longitudinal freezers 1 according to Fig. 1) corresponds to twice the depth of the freezers 1 placed against each other with their rear walls. The Fig.Figure 3 shows an end section of a freezer 1 in a perspective cross-sectional view, from which the structure of the front wall 10, the rear wall 14, the bottom wall 12 and parts of the interior of the freezer 1 with the cold room 6 comprising the goods room 60 and also parts of a cooling air generation arrangement for cooling or freezing goods present in the cold room 6 can be seen in more detail.

[0037] In the rear wall 14, the bottom wall 12, and the front wall 10 of the housing wall assembly, a continuous duct arrangement for guiding cooling air around the cooling compartment 6 is arranged between a respective thermally insulated outer part 141, 121, or 103 and a respective inner part 142, 122, or 104 with an inner transparent part 105. The duct arrangement is part of an air distribution system 2, which is supplemented by a fan unit 21 to generate an airflow. This fan unit is located in a shaft 20 in the transition area between the lower end section of the rear wall 14 and the rear end section of the bottom wall 12, extending longitudinally x along the housing of the freezer 1. The recirculation of the airflow guided by the duct arrangement is supplemented by an airflow section in the upper area of ​​the cooling compartment 6 between the upper area of ​​the front wall 10 and the rear wall 14. parts of the recirculated air or air.Cooling air (due to a certain stagnation pressure in the front area of ​​the bottom wall duct) is directed from below through a perforation in the inner part 122 of the bottom wall 12, which covers the bottom wall duct 203 of the duct arrangement, across the floor area of ​​the cooling chamber 6, in order to achieve a balanced temperature distribution even in the floor area of ​​the cooling chamber 6. The goods compartment 60 extends into the cooling chamber 6 up to the height of a stacking mark 52 located on the rear wall 12, preferably directly on the rear wall grid, in its upper area. To ensure that the circulating air (cooling air) is used for cooling or deep-freezing the goods in the cooling chamber 6, respectively, the following applies:To cool the goods located in storage compartment 60 to the required low temperature, the housing wall of the respective outer part 141, 121, 103, on or in its surface facing the duct arrangement, is provided with a large-area evaporator tube arrangement 3, which forms part of the refrigeration circuit of a refrigeration device and is supplied with a refrigerant at a low temperature level for the required cooling (and thus "cold-transporting"). The evaporator tube arrangement is covered by a flat evaporator plate, which is applied to the externally well-insulating material (preferably polyurethane foam) of the respective outer part 141, 121, or 103.The inner parts 142, 122, 104, which limit the channel arrangement towards the cooling chamber, are formed from flat, highly heat-conducting sheet metal parts, which are spaced apart on the inside of the respective outer part 141, 121, 103 or the respective evaporator sheet metal part by means of web-like or bolt-like spacers.

[0038] As can be seen further in Fig. 3, the rear wall 14 is largely, practically over its entire inner surface area of ​​the outer part 141 facing the rear wall channel 200 formed in it, provided with the evaporator tubes of the evaporator tube assembly 3, which are laid out, for example, in a serpentine pattern. The evaporator tube assembly 3 extends (as is not apparent in Fig. 3) practically also in the longitudinal direction x over the entire length of the inner wall surface of the outer part 141 of the rear wall 14 and is covered on its inner side facing the rear wall channel 200 by the evaporator plate part. The well heat-insulating part of the outer part 141 of the rear wall 14 (as well as the outer part 121 of the bottom wall 12 and the outer part 103 of the lower front wall section 100) is made of a mechanically strong material, in particular a stable, load-bearing foam material, preferably polyurethane foam.The cooling capacity is transferred to the rear wall duct 200, or to the cooling air passing through it, via the evaporator plate section, which is preferably applied directly to the evaporator tubes. The lower front wall section 100 and, for example, the bottom wall 12 also have a corresponding structure and mode of operation for transporting the cooling capacity. Alternatively, the evaporator tubes of the evaporator tube arrangement 3 can be omitted in the bottom wall 12, although the bottom wall duct 203 is still present. A condenser tube arrangement 40 with, for example, a [missing information] is located on the outside of the outer part 141 of the rear wall 14 (as well as the outer part 121 of the bottom wall 12 and the outer part 103 of the lower front wall section 100).The condenser pipes, which are also laid in a serpentine pattern, are inserted into or applied to dissipate waste heat to the outside ambient air, wherein the outer part 141, as well as the other outer parts 121 and 103, are provided on their outer side facing away from the cooling room with a thin, highly thermally conductive coating, in particular made of metal.

[0039] The rear wall 14 has, on its inner side facing the cooling compartment 6, an inner part 142, which consists of a thin plate, e.g., no more than 3 mm or 5 mm thick, preferably made of metal (such as aluminum, steel, copper, or the like). The inner part 142 is sufficiently robust to securely support and accommodate a goods receiving arrangement with a vertical support 50 and at least one horizontal support 51 attached to it. The rear wall channel 200, formed between the outer part 141 or the evaporator plate part and the inner part 142, is open or provided with openings along its entire length at its upper end to allow the passage of circulating cooling air. Below the upper opening of the rear wall channel 200, the stacking mark 52 is arranged to indicate the upper boundary of the goods compartment 60.

[0040] The bottom wall 12 has on its underside the outer part 121, which is preferably made of a well thermally insulating, self-supporting, stable material, in particular a foamed, mechanically strong plastic material such as polyurethane foam, corresponding to the outer part 141 of the rear wall 14. The outer part 121 is provided with the associated part of the evaporator tube assembly 3 on or in its inner surface facing the bottom wall channel 203, extending from the rear to the front and between the two side walls. The evaporator tubes are covered on their side facing the bottom wall channel 203 by an evaporator plate section. On the outside of the outer part 121 of the bottom wall 12, as with the outer part 141 of the rear wall 14, an associated part of the condenser tube assembly 40 is arranged to dissipate waste heat, e.g., via an outer coating made of sheet metal, to the surrounding air.If necessary, the condenser pipe arrangement in the bottom area can be designed as a pre-condenser arrangement.

[0041] The inner part 122 of the bottom wall 12, which covers the bottom wall duct 203 and forms an air guide plate, is provided with the aforementioned perforation 123 for distributing a portion of the cooling air in the floor area of ​​the cooling room 6. The shaft 20, in which the fan unit 21 is arranged, is provided with a shaft cover 22 extending over the longitudinal extent of the duct assembly to complete the transition area between the lower section of the rear wall duct 200 and the rear section of the bottom wall duct 203. In an alternative embodiment, the bottom wall 12 can be designed in a trough-like form, wherein a thin-walled trough with slightly raised side wall sections is applied to the inside of the heat-insulating material, and, for example, the evaporator tubes in the floor area are omitted. The trough thus formed is preferably made of plastic, but can also be made of metal. The upper surface of the trough then forms the lower boundary of the bottom wall duct.

[0042] The front wall 10 is constructed from the lower front wall section 100 and the upper front wall section 101, which is sealed to the lower front wall section 100. The front wall channel formed in the front wall 10 consists of a lower front wall channel section 202 and an upper front wall channel section 201 that transitions into the lower front wall channel section 202. The lower front wall section 101 is preferably made of a well thermally insulating material, in particular a mechanically strong, self-supporting, stable foamed plastic material (preferably polyurethane foam), corresponding to the rear wall 14. The lower front wall section 101 carries the associated part of the evaporator tube assembly 3 over the surface area facing the lower front wall channel section 202. The evaporator tube assembly 3 is also covered on the channel side by an evaporator plate section.On the outer surface of the lower front wall section 100, a corresponding portion of the condenser tube assembly 40 is arranged for heat dissipation, corresponding to the rear wall 14. The outer surface of the outer part 103 also has a highly thermally conductive coating, as on the rear wall 14. The inner part 104 of the lower front wall section 100, like the inner part 142 of the rear wall 14, consists of a highly thermally conductive, thin, plate-like material with sufficient load-bearing capacity to support a vertical support 50 or at least one horizontal support 51. The evaporator tube assembly 3 also extends largely, practically across the entire surface of the outer part 103 of the lower front wall section 100, from its lower edge to its upper edge and along its length between the two side walls 11 and 1T.

[0043] The upper front wall section 101 is transparent to allow as much visibility as possible of the goods compartment 60 and the goods it contains. As shown in Fig. 3, the goods compartment 60 extends vertically beyond the lower edge of the upper front wall section 101 and the upper edge of the lower front wall section 100, with the stacking mark 52 attached to the inside of the rear wall 14 also positioned higher than the lower edge of the upper front wall section 101. To ensure adequate cooling of the area of ​​the goods compartment 60 located within this viewing range between the lower longitudinal edge of the upper front wall section 101 and the height of the stacking mark 52, the upper front wall section 101 is also transparent.For deep cooling, the upper front wall duct section 201 extends in height above the upper edge of the goods compartment 60, wherein the upper front wall duct section 201 is bounded externally by a heat-insulating outer transparent part 108 and internally towards the goods compartment 60 by an inner transparent part 105. The inner transparent part 105 is provided with a perforation 106 in a surface area of ​​its upper end region, through which cooling air guided by the upper front wall duct section 201 can flow distributed over the relevant area of ​​the cooling chamber 6 or goods compartment 60. In the upper region of the upper front wall duct section 201, a deflecting element 107 is arranged, extending longitudinally over the upper end, projecting inwards towards the cooling chamber and preferably inclined downwards at a slight angle (e.g., by no more than 20°) to the horizontal.This ensures favorable airflow for cooling the storage area 60. For positioning the goods in the storage area 60, the storage carrier 5 is designed so that the horizontal support 51 can be easily attached, in particular hooked, to the vertical support 50 at a suitable height.

[0044] The duct arrangement and the fan unit 21 are advantageously designed such that the cooling air or cold air circuit is guided from top to bottom through the rear wall duct 200, from back to front through the bottom duct 203 or partially through the perforation 123, from bottom to top through the lower front wall duct section 202 and the upper front wall duct section 201, and through the hole arrangement 106 through or over the upper area of ​​the storage compartment 60 and again through the upper opening into the rear wall duct 200. In this way, the cooling compartment 6, in particular the storage compartment 60, is also advantageously supplied with cold and cooled by the cold of the highly thermally conductive internal parts 142 of the rear wall 14, 122 of the bottom wall 12, 104 of the lower front wall section 100, and also of the inner transparent part 105 of the upper front wall section 105.The fan unit 21 has at least one, preferably two, or optionally even more fans, which are preferably designed as cross-flow fans. This ensures a largely uniform airflow over the entire length of the cooling compartment 6, resulting in effective, largely uniform, and balanced cooling or deep freezing. In contrast to Fig. 3, Fig. 4 shows the product support device 5 with the vertical support 50 and the horizontal support 51 for placing goods in more detail. The construction of the freezer 1, including the wall arrangement, the cooling air generation arrangement comprising the cooling air duct arrangement, and the interior design of the housing, otherwise corresponds to the embodiment shown in Fig. 3.

[0045] Fig. 5 shows the design of the freezer 1 according to Fig. 3 in cross-section near a side area, showing the structure of the housing wall and the cooling air guidance as well as the arrangement of the product compartment 60.

[0046] Fig. 6 shows an enlarged view of a lower section of the freezer 1 shown in Fig. 4 with the horizontal support 51.

[0047] Fig. 7 shows a side section of a freezer 1 according to the construction of Fig. 1 (specifically the right-hand section) with a perspective view of the interior in longitudinal section. A machine compartment 70 for housing components of a refrigeration unit, such as a compressor and optionally a pre-condenser, as well as other components, including electronic components, is located in the lower right area between the side wall and the base. The inner part 122 of the base wall 12, designed as an air deflector, is supported on the outer part 121 by narrow support elements extending in the depth direction and featuring large-area recesses. As shown in Fig.As shown in Figure 7, the side wall 11, which extends upwards over the engine compartment 70, is also provided with an opaque, well-insulated, mechanically stable outer part 114. This outer part is fitted with an evaporator tube assembly 3 and an evaporator plate section 115 covering it, either on its inner surface or on its inner surface. A spacer grid is also attached to the inner surface of the outer part 114, specifically to the evaporator plate section 115 covering the evaporator tube assembly 3. This grid is positioned at a distance from the inner surface of the outer part 114 to create a gap between the goods placed inside and the inner surface of the outer part 114, and to allow for the circulation of air (cooling air), thus preventing goods from freezing to the side wall 11. The side walls 11 are cooled, for example, exclusively by static means (without a cooling air duct). However, the side walls 11 can also be provided with an inner part to form a side wall channel 204.The engine room 70 is provided with an engine room cover 71 for mechanical and thermal separation from the cooling room 6.

[0048] Fig. 8 shows an upper section of a freezer 1 with a view into a lateral interior area, wherein the illustrated side wall 11' according to an embodiment of the freezer 1 according to Fig. 2 has a lower opaque side wall section 110 and an upper transparent side wall section 111.

[0049] Fig. 9 shows a larger side section of a chest freezer 1 according to Figs. 2 and 8. In this perspective longitudinal section, unlike the embodiment shown in Fig. 7, the (right) side wall 11' has, in its transparent upper side wall section 111, an inner viewing panel 112 facing the cooling compartment 6 or the interior of the housing, and a multi-layered, heat-insulating outer viewing panel 113 spaced apart from it by its inner surface. In the area of ​​the transparent upper side wall section 111, there is no spacer grid corresponding to the lower side wall section 110, so that an unobstructed view into the product compartment 60 is possible through the upper side wall section 111, and this embodiment of the chest freezer 1 is advantageously usable as the end unit of a freezer island. A glass pane, preferably made of Plexiglas, is mounted as a spacer.This prevents the goods from coming into direct contact with the outer transparent part 108.

Claims

Claims 1. Chest freezer (1) with a housing comprising a fixed heat-insulating housing wall arrangement consisting of a front wall (10), rear wall (14), bottom wall (12) and two side walls (11, 11'), in which a cooling compartment (6) for goods placed therein, covered by an openable cover, and a cooling air generation arrangement for cooling or freezing the same are arranged, wherein the cooling air generation arrangement comprises a refrigeration device including an evaporator unit and a cooling air guide arrangement, which includes a rear wall channel (200) formed between a heat-insulating outer part (141) and an inner part (142) of the rear wall (14) and a front wall channel (201) formed between a heat-insulating outer part (108) and an inner part (104) of the front wall (10).202) and a floor wall channel (203) formed between a heat-insulating outer part (121) and an inner part (122) of the floor wall (12), as well as a fan unit (21) arranged in this channel arrangement for generating a recirculating airflow, characterized in that the evaporator unit is designed as a static evaporator with an evaporator tube arrangement (3) which is arranged at least partially in or on a surface of the rear wall (14) facing the rear wall channel (200) and / or a surface of the front wall (10) facing the front wall channel (202) and / or a surface of the floor wall (12) facing the floor wall channel (203).

2. Chest freezer according to claim 1, characterized in that the surface area of ​​the rear wall (14) over which the evaporator tube arrangement (3) associated with the rear wall channel (200) extends comprises more than 50%, at least 60%, at least 70% or at least 80% of the rear wall surface facing the rear wall channel (200) and is predominantly arranged in the lower part of the rear wall (14) and in particular extends at least partially over the entire length of the rear wall (14).

3. Chest freezer according to claim 1 or claim 2, characterized in that the rear wall (14), the bottom wall (12) and a lower front wall section (100) comprise an outer part (141, 121, 103) made of heat-insulating self-supporting material, which surrounds the channel arrangement on its side facing away from the cooling chamber (6), and an inner part (142, 122, 104) made of a highly thermally conductive, in particular thin-walled, self-supporting material, such as metal, which at least largely limits the channel arrangement on its side facing the cooling chamber (6) on the inside – except for any perforation that may be present.

4. Chest freezer according to claim 3, characterized in that the surface area of ​​the lower front wall section (100), over which the evaporator tube arrangement (3) associated with the front wall channel (202) extends, extends more than 50%, at least 60%, at least 70% or at least 80% of the surface of the lower front wall section (100) facing a lower section of the front wall channel (202).

5. Chest freezer according to one of the preceding claims, characterized in that that the front wall (10) in its upper area comprises an upper front wall section (101) which is made of a transparent material for the visual identification of goods received in the cold room (6) and comprises an upper section of the front wall channel (201) on its side facing away from the cold room (6) a transparent, heat-insulating outer viewing part (108) and an inner viewing part (105) which defines the upper section of the front wall channel (201) on its side facing the cold room (6).

6. Chest freezer according to one of the preceding claims, characterized in that both the rear wall channel (200) and the front wall channel (201) have an opening arrangement extending along its upper edge region for the circulation of air.

7. Freezer according to claim 6, characterized in that the opening arrangement at the upper edge region of the front wall channel (201) has a hole arrangement in the upper edge region of the inner transparent part (105).

8. Chest freezer according to one of the preceding claims, characterized in that the recirculated air flow generated by means of the fan unit (21) runs from top to bottom through the rear wall channel (200), from the rear to the front through the bottom wall channel (203) and from bottom to top through the front wall channel (202, 201).

9. Freezer according to claim 8, characterized in that a deflecting element (107) for the recirculating air flow is arranged at the upper end of the front wall channel (201) extending over its length and projecting towards the cooling compartment, in particular obliquely downwards.

10. Freezer according to one of the preceding claims, characterized in that the fan unit (21 ) is arranged in the, preferably lower, region of the rear wall channel (200) or in the, preferably rear, region of the bottom wall channel (203).

11. Freezer according to one of the preceding claims, characterized in that the fan unit (21) comprises at least one or at least two fans designed as cross-flow fans arranged with their axis of rotation in the longitudinal direction of the freezer (1).

12. Freezer according to one of the preceding claims, characterized in that the fan unit (21 ) with a shaft cover (22) extends over at least 50% or 70% of the longitudinal extent of the rear wall channel (200) measured in the longitudinal direction of the housing.

13. Chest freezer according to one of the preceding claims, characterized in that the side walls (11, 11') are also provided with side wall channels formed between a heat-insulating outer part and a spacer grid attached thereto on the inside or a highly heat-conducting inner part, to which cooling air is supplied via a connection area from the bottom wall channel (203). is possible, which can be routed via a channel at the upper edge of the side wall channels above or through the cold room.

14. Freezer according to one of the preceding claims, characterized in that the side walls (11 , 11') are also provided with an evaporator tube arrangement (3) in or on a surface of the outer part (114) facing the cooling chamber (6), wherein in the embodiment according to claim 13 the evaporator tube arrangement (3) is arranged in or on a surface bounding the side wall channel.

15. Chest freezer according to one of the preceding claims, characterized in that the side walls (11') have a lower side wall section (110) with an outer part and a spacer grid arranged thereon directly on an evaporator plate part (115) or forming a side wall channel with a thin-walled inner part that conducts heat well, and have an upper side wall section (110) with a heat-insulating outer transparent part (113) and with or without an inner transparent part (112), wherein the respective side wall channel, if any, extends continuously through the lower and upper side wall sections (110, 111).

16. Freezer according to one of the preceding claims, characterized in that the refrigeration device has a condenser tube arrangement (40) arranged externally on or in an outer surface of the housing wall arrangement in a heat-conducting manner towards the outside environment and cooling components arranged in a machine room (70), in particular in a lower lateral area.

17. Chest freezer according to one of the preceding claims, characterized in that retaining elements for at least one goods storage shelf positioned or to be positioned in the cold room (6) are arranged on the inside of the housing wall facing the cold room, in particular the inner parts (142, 104) of the rear wall (14) and the front wall (10).

18. Freezer according to one of the preceding claims, characterized in that the inner part (122) of the bottom wall (12) is provided with a surface-extended perforation (123) to effect a balanced temperature distribution at least in the area near the bottom of the cooling compartment (6).

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