DE112011101266B4 - cooling rack - Google Patents

Abstract

Refrigerated display case with an air supply for generating an air curtain, the air supply having at least one air duct and at least two fans, characterized in that the fans each have independent means for checking the function of the respective fan.

Description

The invention relates to a refrigerated shelf which is intended in particular for commercial use in the food sector, for example for meat, vegetables, fruit or dairy products.

Customary refrigerated shelves, which consist of uprights, a floor assembly, a rear wall assembly, a ceiling element and shelves, naturally get dirty particularly quickly due to the open design and installation in a busy sales room and have to comply with hygiene regulations, but also to avoid blockages in the To prevent air passages and impairment of the cooling performance, be cleaned regularly. To do this, the cover plates on the rear wall must be levered open, unhinged and placed outside the refrigerated section while the air ducts are being cleaned.

Fans conveying cold air are usually also provided in the rear wall of commercially available refrigerated shelves, which, like the cover plates mentioned above, have to be dismantled with great effort in order to clean the refrigerated shelves. Furthermore, if such a fan from a large number of fans provided in a refrigerated shelf fails, this can affect the cooling capacity of a refrigerated shelf over a longer period of time and, in the worst case, lead to the spoilage of the goods offered for sale, since a failure of a single fan is usually not immediate is recognized.

Furthermore, refrigerated shelves according to the prior art are usually equipped with support arms that can be mounted at variable heights, on which shelves are fastened or placed. The support arms are mounted using rows of holes on the uprights of the refrigerated display case, from which uncontrolled cold air can escape into the goods area. However, this undesirably escaping cold air leads to difficulties in the dimensioning of the ventilation assemblies of a refrigerated shelf, such as the fans or the cold air openings of the goods area, as a result of which refrigerated shelves are usually not designed to meet requirements, but are oversized.

It is also customary with commercial refrigerated shelves that the cooling air curtain emerging from the ceiling element is supplemented by a second air curtain, which lies directly in front of the first cooling air curtain and, on the one hand, improves the cold insulation of the goods compartment and, on the other hand, supports the first cooling air curtain in which the formation a cooling technically unfavorable turbulent boundary layer between cooling curtain and room air is reduced. According to the state of the art, this supporting cooling air curtain is generated on the ceiling element of the refrigerated display case, for example with an additional fan from the mixture of cooling air and warm room air. For this purpose, the cooling air is branched off from the flow of cold air that is already present, which, however, means that the ventilation and cooling assemblies require more power.

According to the state of the art, the heat exchangers designed as evaporators of a refrigerated shelf usually consist of a meandering metallic pipe coil, which is connected to a large number of metal fins for cooling the cold air flow, with an evaporator having a minimum required installation space and this installation space for the design of the goods compartment is not available.

WO 02/005 689 A1 describes a shelf cabinet for refrigerated goods and a method for controlled/regulated air circulation in the shelf cabinet. The shelf cabinet for refrigerated goods comprises an opening for introducing or removing refrigerated goods and a duct arrangement for circulating cooled air from a cooling element provided thereon. The duct arrangement makes it possible to direct cooled air in separate streams partly between the refrigerated goods and partly past the opening in order to create a shielding layer.

US 2007/0 068 180 A1 describes a refrigerator and a method for controlling the same. This has a refrigeration compartment and a freezer compartment, a first evaporator and a second evaporator, and a compressor, the compressor compressing refrigerant to be supplied to the first and second evaporators. In addition, the refrigerator has a first fan and a second fan that supply cool air to the compartments, an outside temperature sensor that detects an outside temperature of the refrigerator, a multi-way valve that supplies the refrigerant to at least one of the evaporators, and a control unit that controls the compressor and the Multi-way valve operates and drives the first fan and the second fan on.

In U.S. 5,931,011 A discloses a cryogenic storage cabinet having a freeze cycle system consisting of a compressor, a condenser, a choke and an evaporator. In addition, this has a cabinet temperature sensor for detecting an internal temperature of the cabinet and an electric fan provided in the cabinet for circulation refrigerated air inside the cabinet, wherein the compressor in the freeze cycle system is activated in response to an increase in the internal temperature of the freezer and deactivated in response to a decrease in the internal temperature of the freezer, and wherein the operating rate of the electric fan in accordance with a decrease in Temperature or pressure of the refrigerant in the freeze cycle system is reduced during deactivation of the compressor to thereby reduce electric power consumption.

With GB 1 216 038 A improvements regarding cooling devices are disclosed. Here, a refrigerated cabinet is described, which forms a cold air curtain.

In U.S. 6,775,994 B1 also describes a refrigerated display merchandiser with a variable air curtain as in the above reference. It includes a display case that defines an open-faced product display area that is isolated from the store's ambient air by a downwardly directed internal air curtain of relatively cool, refrigerated air. The amount of airflow forming the air curtain is selectively increased in response to a signal from a controller when a sensor detects a disturbance in the integrity of the air curtain or movement in front of the case.

The object of the invention is therefore to provide a refrigerated display case which, on the one hand, has lower energy consumption and increased efficiency for generating the cold air and, on the other hand, enables maintenance and cleaning to be carried out at lower cost and in less time.

To solve this problem, on the one hand, a refrigerated shelf with an air supply for generating an air curtain is proposed, the air supply having at least one air duct and at least two fans, and the refrigerated shelf being characterized in that the fans each have independent means for checking the function of the respective Have fans.

If only one fan is present, a fan of a refrigerated shelf can be checked for its function, for example acoustically or by manually checking the air flow. If there are several fans on a refrigerated shelf, the function can also be checked advantageously and particularly easily by means other than haptic or acoustic means, particularly when only one fan has failed.

The means for checking the function of the refrigerated section are also advantageously designed in such a way that the means for checking the function includes monitoring an air flow generated by one of the two fans. It is immediately apparent that if a fan fails, the air flow or the volume flow of the air conveyed by the fans decreases and the means for functional control by measuring the air flow can reliably and particularly easily indicate a failure or a defect in an individual fan. so that this is also correspondingly advantageous independently of the other features of the present invention, in particular also in the case of a refrigerated shelf with only one fan.

In order to indicate a defect in a fan in a simple and cost-effective manner, provision can be made cumulatively or alternatively for the air flow monitor to have a mechanical display. Furthermore, in addition to a mechanical display, the refrigerated shelf or the function indicator of the refrigerated shelf can advantageously be designed in such a way that the mechanical display includes a color coding. In particular in connection with the mechanical display, a function indicator that is particularly easy to produce and reliable can be provided. For this purpose, the color coding can consist either of a single color or of a multicolored color scale, so that if a multicolored color scale is present, an impending failure of a fan can also be displayed step by step. A fan can also be monitored here if a total failure has not yet occurred, but the fan is already conveying air in the refrigerated section at a lower speed. Such a mechanical display is also advantageous, independently of the other features of the present invention, in a refrigerated shelf with an air supply for generating an air curtain, the air supply having at least one air duct and at least one fan.

Furthermore, as an alternative or in addition to the above features, a refrigerated display case with an air supply for generating an air curtain, with the air supply having at least one air duct and at least one fan, can also be advantageously designed in such a way that air flow monitoring has a dynamic pressure display, an air resistance scale, an air flow speed display, has a vacuum display and/or an overpressure display.

The aforementioned air flow monitoring can also be implemented mechanically and accordingly with the corresponding advantages. Depending on what you want Depending on the installation position of the air flow monitor, it can be useful to use one of the above alternatives as an air flow monitor.

For example, a dynamic pressure display is best suited for installation situations in which an equalization opening on the air duct is not provided in an environment or cannot be implemented. A vacuum indicator, on the other hand, can preferably be provided in an intake area, i.e. upstream of the fan, while an overpressure indicator is preferably provided behind a fan, i.e. downstream of the fan.

An underpressure or overpressure indicator can, for example, comprise a suitable signal body or piston, such as a flow and/or floating body, which experiences buoyancy from the differential pressure present between the environment and the air duct and consequently, for example, a color coding or color coding attached to this signal body Mechanically move the color scale in a suitable manner in a viewing window open to the goods area. The first-mentioned dynamic pressure display can also be designed with the same function, with a signal body and two pressure openings or dynamic pressure openings, with the upstream dynamic pressure opening preferably being installed at a point in the cold air duct downstream of the fan at which there is a maximum flow speed.

On the other hand, an air resistance scale or an airflow speed indicator can comprise a resistance body, which is located in the airflow and offers resistance to this airflow, with this air resistance, as in the case of a signal body, also forcing the resistance body to move. This movement can also be mechanically transmitted in an air resistance balance or in an air flow speed display by means of a mechanism or lever to a suitable color scale or color coding.

The following embodiments are not part of the invention and are not part of the solution to the task mentioned at the outset. The features listed below therefore deviate from the subject matter of the invention.

In addition and purely for information on the task mentioned above, a refrigerated display case with a framework and with at least one cover plate arranged on the framework is proposed, which is characterized in that the cover plate is rotatably attached to the framework via at least one hinge. Fastening the cover plate to the stud frame, in particular if the fastening is designed to be rotatable, advantageously facilitates cleaning work, since time-consuming levering and removal of this cover plate is no longer necessary, and the rear panel assembly can therefore be opened with less effort and without bending the cover plate .

In order to provide such a hinge in a structurally simple, robust and cost-effective manner, at least one assembly of the hinge, for example a first of two bushings, can be designed in one piece with the framework. Cumulatively or alternatively, at least one subassembly of the hinge, for example a second bushing of the two hinge bushings, can also be designed in one piece with the cover plate. In addition, a hinge pin in particular, which connects the two bushings of a hinge to one another in a rotatable manner, can be formed in one piece with one of these two bushings. This offers the advantage of enabling cost-effective production of a hinge, a stand or a cover plate for a refrigerated display case. Furthermore, hinges designed in this way offer the advantage of being able to be designed to be particularly robust and have a long service life. The manufacturing advantage comes into play preferably when the hinge is formed during the stamping of the stud frame or during the stamping of the cover plate in one and the same work step with the stud frame or the cover plate, possibly also by means of a subsequent forming process.

Furthermore, in an embodiment which lies outside the scope of the invention described here, the refrigerated display case can advantageously have a sealing edge in a gap between the cover plate and the stud frame as an alternative or in addition to this. The formation of a sealing edge, which may be done by simply folding, beading or bending a sheet metal edge, can effectively prevent leakage of cold air. A sealing edge should in particular include an angled area, since such an angled sealing edge can improve the sealing effect, particularly in areas that move relative to one another, such as in the area of a hinge, without restricting mobility.

Furthermore, it is advantageous if the sealing edge is formed on the cover plate and/or on the framework.

Therefore, this sealing edge does not necessarily have to be realized by an additional seal, since for this purpose, as already explained above, the sealing edge consists of the sheet metal edge of the cover plate or the stud frame is shaped in a suitable way. As a result, depending on the design, production costs, in particular additional costs for a seal, can be eliminated.

In order to keep a gap between the stud frame and the cover plate as small as possible, it is also advantageous if the hinge is arranged on a side of the cover plate facing away from the stud frame. In this respect, a sealing edge can be dispensed with, since this arrangement allows the cover plate to lie directly on the stud frame, with the hinge being arranged towards the goods compartment of the refrigerated display case and being visible from the outside.

In this case in particular, but also in any other arrangement of the hinge and the cover plate, it is advantageous if the hinge comprises at least one roller bushing which is formed from sheet metal forming the cover plate. In this case, as already explained above, the hinge can be formed at least partially from the cover plate in one work step, with this embodiment being able to be designed cost-effectively and, in particular, to save space.

Furthermore, in an embodiment outside the scope of the invention described here, the refrigerated display case can be designed such that the cover plate is rotatable about a pivot axis of the hinge and translationally displaceable parallel to a radial direction of the pivot axis. This advantageously provides a cover plate which, when closed, enables a particularly attractive refrigerated shelf or a particularly attractive goods compartment of a refrigerated shelf, in that the gaps formed between the cover plate and the stud frame are formed symmetrically, i.e. evenly on both sides of the cover plate.

If a movable closure is not provided on the cover plate, it may also be possible to form the closure directly on the cover plate, for example by means of a hook, with such a closure formed on this cover plate in a counterpart due to the translational movement of the cover plate described above , such as the stud frame, and can secure the cover plate against opening.

Alternatively, in an embodiment which is outside the scope of the invention described here, the refrigerated display case can also be designed in such a way that the cover plate can be rotated about the axis of rotation of the hinge and translated in translation parallel to the axis of rotation of the hinge. Thus, a cover plate can be provided which is movable to open in a vertical direction instead of in a horizontal direction, while at the same time the weight of the cover plate acts as a closing force and accidental opening of the cover plate can be effectively avoided. A translational displacement of the cover plate parallel to the axis of rotation of the hinge also enables the cover plate to be shifted in the direction of the goods compartment of the refrigerated section, as a result of which sealing gaps provided on this cover plate are opened and the cover plate can thus also be opened in a rotatable manner without bumping into the stud frame or other components can.

It goes without saying that the side of the refrigerated display case from which the goods in the goods compartment are freely accessible is referred to as “front”, ie the side of the refrigerated display case facing a sales room. It is also immediately apparent that "rear" refers to a rear wall of the refrigerated section, ie the side of a refrigerated section which regularly faces a wall of a salesroom or from which it is not intended to remove goods from the refrigerated section.

Alternatively or cumulatively, in an embodiment which lies outside the scope of the invention described here, a refrigerated display case can also have means for connecting a support arm to the framework, which consists of two interacting components, the cover plate for fixing to the framework having a Closure on a side of the cover plate opposite the hinge and the closure has a first component of the two components of the connecting means, which cooperates with a second component of the two components of the connecting means located on the stud frame. As already explained above, a cover plate or a refrigerated shelf can be made available inexpensively by means of such an embodiment, since the connection means for connecting the support arms that are already present on the framework can be used to connect the cover plate to the framework or to close the cover plate close. The two components for connecting a support arm can be, for example, a hook located on the support arm and a hole located on the stud frame, which engage in one another to connect or close the cover plate. However, it is also conceivable that a separate rotary hook provided on the cover plate is used to close the cover plate.

Cumulatively or alternatively, in an embodiment outside the scope of the invention described herein, the hinge be fastened with the means for connecting the support arm to the stud frame. It is immediately apparent that a hinge for pivotally attaching the cover plate to the studwork may also have a hook which cooperates with a hole provided for attachment of a bracket. As a result, no further openings are required in the stud frame for attaching the hinges and for the locking system of the cover plate, which means that a work step in the manufacture of the stud frame, for example punching, can be omitted.

In addition to and purely for information on the task at the outset, a refrigerated shelf is proposed with at least one row of holes for fastening support arms for shelves, with the row of holes being provided in a wall of the air duct and with the refrigerated shelf being characterized in that on the side facing the air duct the Wall is arranged at least one seal for sealing the row of holes. In this way, an uncontrolled flow of air or a flow of leakage, in particular into or out of the areas of the refrigerated section to be cooled, is advantageously and reliably avoided or minimized, with this seal not being accessible from the outside since it is arranged in an inner area of the post structure . Such a seal is advantageously made, for example, from a single rubber element or from a plurality of rubber elements. However, individually arranged sealing surfaces are also conceivable, each of which individually seals the holes located in the row of holes.

The seal is advantageously a profiled sealing strip with a longitudinal extension along the row of holes. In contrast to individual rubber elements, a profiled sealing strip can have a very simple structure and can therefore offer the advantage of being able to be produced and assembled very quickly and reliably.

In order not to prevent the mounting of the support arms or arched shelves and at the same time to achieve a good sealing effect of the sealing strips used, it is also advantageous if the side of the seal facing the row of holes is at a distance from a hole in the row of holes or from the row of holes. It is immediately apparent that a hook of a support arm or other alternative fastening means can be inserted into a hole in the row of holes without hitting the seal or displacing this seal with the formation of a gap, as a result of which the operational reliability of a seal can be advantageously improved.

In addition, in an embodiment which lies outside the scope of the invention described here, at least one part of the wall comprising the row of holes can have a groove on its side facing the air duct, the seal being arranged in the groove. Consequently, a seal or a sealing strip can be fastened particularly easily and quickly, in particular when the seal is introduced into the groove under pretension. In addition, as can be seen immediately, a form-fitting assembly of the seal is also possible if the groove has corresponding further grooves or edges in order to effectively prevent the seal from falling out.

In order to advantageously avoid further leaks at the two ends of the light strip or at the upper and lower ends of the framework, a sealing plug can be provided at at least one end of the profiled sealing strip. Such a sealing plug can also have a correspondingly advantageous effect in addition to a base or cover plate, in particular if this is part of an air duct wall.

In order to continue to implement the advantage of the seal that is easy to provide and can be installed in an operationally reliable manner, the seal can be operatively connected to the wall in a non-positive manner.

Furthermore, in an embodiment which lies outside the scope of the invention described here, the seal can have a sealing lip arranged along a longitudinal extension of the row of holes, which advantageously makes it possible to provide a seal in which a carrier or a similar component inserted into the row of holes can damage the seal non-destructively can penetrate and at the same time the sealing effect of the seal is retained at the other points.

In order to enable a cost-effective and at the same time operationally reliable connection option for a support arm to a wall of the post structure, as already explained above, the holes in the row of holes in the refrigerated display case can be designed as slots in a manner known per se and the support arms can include hooks, with the hooks having the elongated holes have a positive fit for detachably connecting the support arms to the wall.

It goes without saying that the seals described above can also be advantageous independently of the other features of the present invention.

In addition to and purely for information on the task at the outset, a refrigerated display case with a fan and an evaporator is alternatively or cumulatively provided in an embodiment that lies outside the scope of the invention described here beat, wherein the fan comprises a rotor and the cooling shelf is characterized in that the rotor is arranged in a maintenance rack. Advantageously, the arrangement of a rotor as a blower or fan in a maintenance frame facilitates the maintenance work required for a refrigerated display case, since the rotor can be operated together with the maintenance frame for these maintenance purposes or can be partially dismantled.

For the maintenance purposes mentioned, in particular also for cleaning purposes, it is particularly advantageous if the maintenance frame and/or a protective machine grille covering the rotor is arranged on a frame of the refrigerated shelf so that it can move in a translatory manner. Cumulatively to this, it is also particularly advantageous that the maintenance frame and/or the protective machine grille is designed as a carriage and is arranged on the frame of the refrigerated shelf so that it can move via a carriage guide. This measure improves the handling of the entire assembly consisting of machine protective grille and blower or ventilator in that it is no longer necessary to completely dismantle the ventilator or rotor in order to clean the ventilator or the cold air duct located behind the ventilator.

Furthermore, in an embodiment which lies outside the scope of the invention described here, a refrigerated display case can advantageously be characterized in that the maintenance frame and the machine protective grille are rotatably arranged on the frame of the refrigerated display case by means of a joint. This enables a simple construction of this arrangement, since only one joint is required to attach the maintenance frame and the protective machine grille. At the same time, the joint can be designed in such a way that the protective machine grille can be detached particularly easily from the joint for cleaning purposes or for other maintenance work, in that it is simply slipped onto corresponding hinge pins.

It is also particularly advantageous for a refrigerated shelf if the protective machine grille has a dust filter. This means that no additional frame has to be provided for installing a dust filter, since the existing machine protective grille accommodates this dust filter in addition to its protective function. In particular, costs can also be saved as a result, since no separate assemblies and maintenance accesses have to be provided for holding the dust filter.

It goes without saying that a refrigerated shelf with a rotor arranged in a maintenance frame, but in particular also with a protective machine grille that carries a dust filter, is also advantageous independently of the other features of the present invention.

In an embodiment outside the scope of the invention described here, a refrigerated display case is proposed with a first air curtain and with at least one second air curtain, the first air curtain being supplied with air from a first intake area and the second air curtain being supplied with air from a second intake area is fed and the refrigerated section is characterized in that at least a portion of the second intake area is arranged near the floor and to the outside outside of the refrigerated section. The arrangement of a partial area of the second intake area near the floor has the particularly advantageous effect of sucking in cool air from the environment, since, as can be seen immediately, cool air collects in the floor area of a room and this cool air is suitable for generating a second air curtain without the second Having to feed air curtains with cold air elsewhere.

In order to continue to use existing structures of the refrigerated section advantageously for this use, in an embodiment that is outside the scope of the invention described here, it can be provided that at least a partial area of the second suction area is arranged in a side wall of a floor assembly of the refrigerated section. Cumulatively or as an alternative to this, it is conceivable that at least a partial area of the second suction area is arranged on a side of the refrigerated section that points forward. By means of these configurations, on the one hand, a second suction area can be made available with only little additional effort, since the wall of a floor assembly of the refrigerated shelf is already present on the refrigerated shelf, and on the other hand, arranging the second suction area on a forward-facing side of the refrigerated shelf can offer the advantage achieve to suck in the air escaping from the refrigerated section into the environment, in particular the cold air escaping from the cold area of the refrigerated section into the environment, and to feed the second air curtain. It is immediately apparent that the efficiency of the refrigerated section can be increased by means of these measures, since the second air curtain is not fed by cooled air from the first air curtain, which is cooled in the cold air circuit of the refrigerated section via the existing evaporator or heat exchanger. In the best case, only the air is used to feed the second air curtain, which escapes into the environment anyway and would therefore be lost for the refrigeration cycle.

In addition, the second suction area can have at least one further partial area sen, the further sub-area being arranged above the first sub-area. When providing a second air curtain, it may be necessary to regulate the temperature of this air curtain by means of additional warm air supplied. It is therefore also cumulatively advantageous if the further sub-area has means for regulating an amount of air flowing through the further sub-area. The regulation of this amount of air flowing through the further partial area serves, as already indicated, to regulate the temperature of the air emerging from the second air curtain. The further partial area is therefore preferably arranged above the first partial area in order to draw in warmer air here. It is also conceivable, however, to feed the further partial area with additional cool air, provided that additional cool air is available, for example, from an air conditioning system that is located outside the refrigerated section anyway. For example, the means for regulating can be a throttle with a flow cross section, the flow cross section of the throttle being variable. In this way, the amount of air sucked in through the further partial area can be adjusted in a particularly advantageous manner.

Furthermore, in an embodiment which lies outside the scope of the invention described here, a refrigerated display case can be characterized in that at least one air duct with at least one cross-sectional area is arranged between the second intake area and an outlet for the second air curtain, the cross-sectional area of the air duct being smaller is as an opening cross section of the second suction area and/or the outlet for the second air curtain. Advantageously, an air duct is made available which can be manufactured in a particularly compact manner in terms of its dimensions and in particular in its lateral surface and can therefore also be manufactured particularly cost-effectively. This is particularly advantageous if the outlet for the second air curtain is designed over the entire width of the refrigerated section or over the entire width of the goods compartment, for example as an elongated slit. As a result, an air duct connected to the outlet no longer necessarily has to have the entire width of an outlet opening. For example, the air duct can be designed in such a way that the air duct widens in a funnel shape in an area directly in front of the outlet opening of the second air curtain, creating a smooth transition from the air duct to the outlet of the second air curtain. In particular, more space then remains for transporting the cold air of the first air curtain, which ultimately makes the essential contribution to cooling.

The last-mentioned advantages can also be implemented for a refrigerated display case in that at least one air duct with at least one cross-sectional area and with at least one circumference is arranged between the second intake area and an outlet for the second air curtain, with the ratio of the cross-sectional area of the air duct to the circumference of the Air duct is a larger than a cross-section-to-perimeter ratio of the second intake area and / or the outlet.

Furthermore, in an embodiment which lies outside the scope of the invention described here, the refrigerated display case can have means for generating an air flow in an air duct connecting the second suction area with the outlet for the second air curtain and the means for generating an air flow in a ceiling area of the refrigerated display case be arranged. For example, a fan or ventilator is provided for this purpose, which is able to convey the air required for the second air curtain through the air duct. The use of a separate fan also offers the advantage that both this separate fan can be designed according to the required air volume for the second air curtain and the fan or ventilator for the first air curtain can be designed according to the required air volume. It is therefore not necessary to use oversized assemblies to generate an air flow, which in turn saves on acquisition costs and running costs.

Since the second intake area, as suggested above, can suck in air close to the ground, in particular air enriched with dust particles, a refrigerated display case is advantageously alternatively or cumulatively designed in such a way that a filter is installed in an air duct connecting the second intake area to the outlet for the second air curtain is arranged.

It goes without saying that a partial area of the second intake area arranged near the floor can also be advantageous independently of all other features of the present invention.

Also, in an embodiment outside the scope of the invention described herein, a refrigerated display case having an air curtain cooling and insulating a merchandise compartment, fed with air from an intake area, with a mechanical device for selectively isolating the merchandise compartment from the environment and wherein the separating device has an open and a separating state, in which the separating device covers a part of the suction area in its separating state. In this way, for example, at night or on public holidays when direct access to the refrigerated section is not necessary, it is easy to do Save energy as the circulating air volume can be reduced accordingly. The latter also appears to make a significant contribution to saving energy, in particular, since the reduced amount of air cools the partition device, for example an insulating curtain, less, so that heat losses through the partition device to the outside can also be correspondingly reduced.

On the one hand, there is the possibility of reducing the amount of air by reducing the fan output. However, this is associated with considerable design effort, since corresponding fans and corresponding control elements must be provided for this purpose. The latter could be avoided, for example, by the separating device itself actuating such operating elements that are actuated accordingly when the separating device is brought into its separating state.

However, the proposed cover enables a reduction in the amount of air in an extremely simple structural manner and can also be easily retrofitted to existing refrigerated shelves.

Preferably, the disconnection device has positioning means that ensure a correct position of the lowered disconnection device in relation to the suction area. This can be implemented, for example, by a tongue and groove system and/or a magnetic device.

In addition and purely for information on the task at the outset, in an embodiment that lies outside the scope of the invention described here, a refrigerated display case with a cold air circuit and with a refrigeration machine is proposed, the refrigeration machine having a heat exchanger with parallel fins, with an air flow of the cold air circuit flows through the heat exchanger and thermally couples the heat exchanger to the refrigerated space via the cold air circuit, and the refrigerated display case is characterized in that the heat exchanger has at least one bluff body between two lamellae, which is formed on a first lamella of the two lamellae, with the bluff body extending in the direction of a normal of the slats is smaller than the distance between the two slats. Naturally, a heat exchanger or evaporator, if it is a vapor refrigeration machine, is always subject to efficiency, with the efficiency of the heat transfer being directly related to the overall length of the heat exchanger or to the size of the surface of the heat exchanger. A bluff body formed on a lamella thus advantageously influences this efficiency in that additional turbulence is applied to the air flow leading through the heat exchanger and the heat transfer from the heat exchanger to the air flow can thus be significantly improved.

In order to implement the advantage of more efficient air cooling, an embodiment that lies outside the scope of the invention described here proposes a refrigerated display case with a cold air circuit and with a refrigeration machine, the refrigeration machine having a heat exchanger with parallel fins, with an air flow of the cold air circuit flows through the heat exchanger and thermally couples the heat exchanger to the refrigerated space via the cold air circuit, and the refrigerated display case is characterized in that the heat exchanger has at least one disruptive body between two lamellae with at least one surface spanned by two vectors, with a first vector of the two vectors having a direction parallel to the slats and a second vector of the two vectors has a direction different from a direction parallel to the slats.

In order to also advantageously design a heat exchanger for a refrigerated display case in a cost-effective manner and with fewer work steps, in an embodiment which lies outside the scope of the invention described here, the interfering bodies can be designed in one piece with the lamellae of the heat exchanger. In this case, for example, a punching process for producing a lamella is appropriate if the lamella itself has to be punched out of a continuous metal sheet or a large plate. It is also conceivable to manufacture a lamella with disruptive bodies using a laser, mechanical or other thermal cutting means.

Furthermore, in one embodiment, which is outside the scope of the invention described here, at least two lamellae arranged in parallel along a main flow direction can have periodically arranged bluff bodies with alternating surface directions and the periodically arranged bluff bodies can be arranged phase-shifted or in phase with the main flow direction. For example, the air flow between two lamellas can advantageously flow back and forth cyclically between the two mutually arranged surfaces of the lamellas, so that on the one hand the turbulent flow that forms causes a higher wall heat transfer and on the other hand air cooled on the surface of a lamella is evenly distributed with the rest of the air mixed with the flow, with a particularly uniform cooling of the air being possible with little or no formation of temperature gradients.

Alternatively or cumulatively, in an embodiment that lies outside the scope of the invention described here, a refrigerated display case with a cold air circuit and with a refrigeration machine is proposed, with the refrigeration machine having a heat exchanger with fins, with an air flow of the cold air circuit flowing through the heat exchanger and the Heat exchanger thermally coupled to the cold room via the cold air circuit and the refrigerated display case is characterized in that two successive slats in the direction of the air flow are arranged in two mutually spaced planes. Regardless of the current flow condition - laminar or turbulent - the air flow can be divided by means of two lamellae arranged in mutually spaced planes in such a way that a warmer area of the existing air flow always flows over a cool lamella, thereby reducing temperature gradients within the flow and mixing the flowing air evenly and is cooled.

It goes without saying that an air flow guided by bluff bodies or offset lamellae is also advantageous independently of the other features of the present invention.

It goes without saying that the features of the solutions described above or in the claims, which are part of this invention, can also be combined if necessary in order to be able to cumulatively implement the advantages accordingly.

Further advantages, aims and properties of the present invention are explained with the aid of the following description of the accompanying drawing, in particular in FIGS 1 , 19 , 20 , 26 , 27a , 27b , 28a , 28b , 29a , 29b , 30a , 30b , 31a and 31b . In addition, alternative embodiments are shown in the other figures for additional and purely informative purposes, which lie outside the scope of the invention described here.

• 1 ein Kühlregal mit einem Kühlluftkanal in schematischem Längsschnitt, der zwischen einer Rückwand und einer Rückwandverkleidung angeordnet ist;
• 2a und b schematische Querschnitte des Kühlregals in Draufsicht;
• 3a bis c einen Ausschnitt aus einem Kühlregal mit drei alternativen Scharnieren zur Befestigung einer Abdeckplatte;
• 4a bis c einen Ausschnitt aus einem Kühlregal in Längsschnitt mit einem in ein Ständerwerk einhakbaren Scharnierkörper;
• 5a und b einen weiteren Ausschnitt aus einem Kühlregal mit einer alternativen Scharnierbefestigung;
• 6a bis c einen weiteren Ausschnitt aus einem Kühlregal mit einer weiteren alternativen Scharnierbefestigung;
• 7 ein Scharnierkörper und eine Abdeckplatte für ein Kühlregal in perspektivischer Ansicht;
• 8a und b einen Ausschnitt aus einem Kühlregal in Querschnitt mit einer alternativen Anordnung einer Abdeckplatte und eines Scharniers;
• 9a bis d einen weiteren Ausschnitt aus einem Kühlregal in Querschnitt mit einer Abdeckplatte und einer alternativen Ausführung eines Scharniers;
• 10 ein Teilbereich eines Kühlregals in Längsschnitt mit einem Kaltluftkanal;
• 11 ein Kühlregal in Längsschnitt mit einem auf einem drehbaren Wartungsgestell montierten Ventilator;
• 12 ein Kühlregal in Längsschnitt mit einem Ventilator auf einem alternativen Wartungsgestell mit Schlitten;
• 13a bis d Detailansichten einer Anordnung aus einem drehbar angeordneten Ventilator und einem drehbar angeordneten Wartungsgestell;
• 14 ein Kaltluftkanal mit einer Rückwand, einer Rückwandabdeckung und mit Ständerwerken in perspektivischer Ansicht;
• 15 das Ständerwerk nach 14 im Querschnitt mit einer Dichtung für eine Lochreihe;
• 16 ein alternatives Ständerwerk im Querschnitt mit einer alternativen Dichtung für eine Lochreihe in ähnlicher Darstellung wie 15;
• 17a und b ein weiteres Ständerwerk im Querschnitt mit einer alternativen Dichtung für eine Lochreihe in ähnlicher Darstellung wie 15;
• 18 Detailansicht des Ständerwerks nach 15 mit einer Abschlussdichtung in perspektivischer Ansicht;
• 19 ein Kühlregal in Längsschnitt mit einem Kaltluftschleier und mit einer Bodenluftansaugung;
• 20 das Kühlregal nach 19 in Draufsicht;
• 21 einen Wärmeübertrager für ein Kühlregal in perspektivischer Ansicht mit Kühllamellen;
• 22 einen weiterer Wärmeübertrager für ein Kühlregal in perspektivischer Ansicht mit Kühllamellen und Störkörpern;
• 23 einen weiteren Wärmeübertrager für ein Kühlregal in perspektivischer Ansicht mit aufgeschweißten Störkörpern;
• 24 einen Querschnitt eines Wärmeübertragers für ein Kühlregal mit Kühllamellen und Umlenkkanten;
• 25 einen Wärmeübertrager für ein Kühlregal in Querschnitt mit Kühllamellen und alternativ ausgeführten Umlenkkanten;
• 26 eine Detailansicht eines Kühlregals mit einem Funktionsanzeiger für einen Ventilator eines Kühlregals;
• 27a und b eine Detailansicht eines Funktionsanzeigers für einen Ventilator eines Kühlregals;
• 28a und b eine Detailansicht eines alternativen Funktionsanzeigers für einen Ventilator eines Kühlregals;
• 29a und b eine weitere Detailansicht eines Funktionsanzeigers für einen Ventilator eines Kühlregals;
• 30a und b eine weitere Detailansicht eines Funktionsanzeigers für einen Ventilator eines Kühlregals;
• 31a und b eine weitere Detailansicht eines Funktionsanzeigers für einen Ventilator eines Kühlregals;
• 32 eine schematische Schnittansicht eines Kühlregals mit einem Rollvorhang als Abdeckvorrichtung;
• 33 eine Detailansicht einer ersten Abdeckvorrichtung für die Anordnung nach 32;
• 34 eine Detailansicht einer zweiten Abdeckvorrichtung für die Anordnung nach 32;
• 35 eine Detailansicht einer dritten Abdeckvorrichtung für die Anordnung nach 32;
• 36 eine Detailansicht einer vierten Abdeckvorrichtung für die Anordnung nach 32;
• 37 eine Detailansicht einer fünften Abdeckvorrichtung für die Anordnung nach 32;
• 38 eine Detailansicht des oberen Bereichs der Abdeckvorrichtung nach 36 in eingerolltem Zustand;
• 39 eine Detailansicht des oberen Bereichs der Abdeckvorrichtung nach 36 in ausgerolltem Zustand;
• 40 eine Alternative zu der Ausführungsform nach 38 in eingerolltem Zustand;
• 41 die Alternative nach 40 in ausgerolltem Zustand; und
• 42 eine perspektivische Detailansicht der Ausführungsform nach 36.

Show in the drawing:

• 1 a refrigerated shelf with a cooling air duct in a schematic longitudinal section, which is arranged between a rear wall and a rear wall covering;
• 2a and b schematic cross-sections of the refrigerated shelf in plan view;
• 3a until c a section of a refrigerated shelf with three alternative hinges for attaching a cover plate;
• 4a until c a section of a refrigerated shelf in longitudinal section with a hinge body that can be hooked into a framework;
• 5a and b another detail from a refrigerated display case with an alternative hinge attachment;
• 6a until c another section of a refrigerated display case with another alternative hinge attachment;
• 7 a hinge body and a cover plate for a refrigerated display case in perspective view;
• 8a and b a section of a refrigerated shelf in cross-section with an alternative arrangement of a cover plate and a hinge;
• 9a until i.e another section of a refrigerated shelf in cross section with a cover plate and an alternative embodiment of a hinge;
• 10 a portion of a refrigerated shelf in longitudinal section with a cold air duct;
• 11 a refrigerated display case in longitudinal section with a fan mounted on a rotatable maintenance rack;
• 12 a refrigerated display case in longitudinal section with a fan on an alternative service rack with skids;
• 13a until i.e Detailed views of an arrangement of a rotatably arranged fan and a rotatably arranged maintenance frame;
• 14 a cold air duct with a rear wall, a rear wall cover and with posts in a perspective view;
• 15 the stud frame 14 in cross section with a seal for a row of holes;
• 16 an alternative stud frame in cross-section with an alternative seal for a row of holes in a similar representation as 15 ;
• 17a and b another stud frame in cross-section with an alternative seal for a row of holes in a representation similar to 15 ;
• 18 Detailed view of the stud frame 15 with an end seal in a perspective view;
• 19 a refrigerated display case in longitudinal section with a cold air curtain and with a bottom air intake;
• 20 the refrigerated shelf 19 in top view;
• 21 a heat exchanger for a refrigerated shelf in a perspective view with cooling fins;
• 22 another heat exchanger for a refrigerated shelf in a perspective view with cooling fins and bluff bodies;
• 23 another heat exchanger for a refrigerated shelf in a perspective view with welded disruptive bodies;
• 24 a cross section of a heat exchanger for a refrigerated shelf with cooling fins and deflection edges;
• 25 a heat exchanger for a refrigerated shelf in cross section with cooling fins and alternatively designed deflection edges;
• 26 a detailed view of a refrigerated shelf with a function indicator for a fan of a refrigerated shelf;
• 27a and b a detailed view of a function indicator for a fan of a refrigerated shelf;
• 28a and b a detailed view of an alternative function indicator for a fan of a refrigerated display case;
• 29a and b a further detailed view of a function indicator for a fan of a refrigerated shelf;
• 30a and b a further detailed view of a function indicator for a fan of a refrigerated shelf;
• 31a and b a further detailed view of a function indicator for a fan of a refrigerated shelf;
• 32 a schematic sectional view of a refrigerated shelf with a roller curtain as a covering device;
• 33 a detailed view of a first covering device for the arrangement according to FIG 32 ;
• 34 a detailed view of a second covering device for the arrangement according to FIG 32 ;
• 35 a detailed view of a third covering device for the arrangement according to FIG 32 ;
• 36 a detailed view of a fourth covering device for the arrangement according to FIG 32 ;
• 37 a detailed view of a fifth covering device for the arrangement according to FIG 32 ;
• 38 a detailed view of the upper area of the covering device 36 when rolled up;
• 39 a detailed view of the upper area of the covering device 36 in unrolled condition;
• 40 an alternative to the embodiment according to 38 when rolled up;
• 41 the alternative after 40 in unrolled condition; and
• 42 a perspective detail view of the embodiment 36 .

1 shows a refrigerated shelf 101 with an open goods space for groceries, which are usually stored on shelves 107. The shelves 107 are mounted on support arms 102 (see for example 2 , 3 , 8th and 9 ) are placed, which in turn are connected to a stud frame, not shown in detail, and can be placed at variable heights. The cooling of the goods located in the goods compartment takes place via the cold air 117, which exits on the one hand from a rear panel 121 and on the other hand from a cold air supply 115. For this purpose, the cold air 117 is conveyed through a cold air duct by means of a fan 112 or blower, with this cold air 117 flowing through the illustrated heat exchanger 114 and being cooled therein to the desired temperature. The heat exchanger 114 is usually an evaporator of a vapor refrigeration circuit. The cold air 117 emerging from the cold air supply 115 is also used as a cold air curtain 116 to cool the goods in order to ensure a largely closed air circuit within the refrigerated section, with the cold air curtain 116 having a blocking effect on the ambient air surrounding the refrigerated section 101. As can be seen immediately, the open design of the refrigerated display case 101 also results in a loss of cold air 118, which, however, is kept as low as possible by the air routing with a cold air curtain 116 and the simultaneous return of the air to the cold air duct 111 through the cold air intake 110, as above implied. The air sucked in by the cold air intake 110 is first guided through the floor area 119 of the refrigerated section 101 and, after flowing through the heat exchanger 114 between the rear wall 120 and the rear wall cladding 121 , rises into the ceiling area 122 of the refrigerated section 101 .

A cross section of the cold air duct 111 in the area of the rear wall 120 of the refrigerated display case 101 is shown in FIG 2 . In 2 the uprights 103 arranged laterally on the refrigerated shelf 101 are also shown, to which in turn the support arms 102 are fastened. This embodiment also demonstrates 2 also has a rear panel cladding 121 designed as a cover plate 123 . This cover plate 123 has, in contrast to conventional embodiments of a refrigerated display case 101, via a hinge 131 attached to the framework 103 and a closure 130, by means of which the cover plate 123 can be opened without dismantling it. This configuration of a cover plate 123 with a hinge 131 and a closure 130 is provided for easy cleaning and maintenance of the cold air duct 111 . Previous configurations of a refrigerated shelf 101 preferably use a cover plate that has to be completely detached, so that these completely detachable cover plates or rear wall panels can be completely removed from the refrigerated shelf 101 for the cleaning and maintenance purposes mentioned, with the dead weight and the dimensions of these detachable cover plates require a not inconsiderable amount of effort and injuries to both the staff and the assemblies of the refrigerated shelf cannot be ruled out.

3 shows a detailed view of the refrigerated shelf 101 according to FIG 1 and 2 with the hinge 131 fastened in the framework 103. The embodiment of a hinge 131 shown in the figure on the left here has a fixed hinge body 132 which is fastened in a lateral area of the framework 103 in a mounting opening 105. The rotatable hinge body of the hinge 131 is further connected to the cover plate 123, thereby enabling this cover plate 123 to be opened as explained above. in the in 3b The figure shown shows an embodiment of a fixed hinge body 132 which is fastened in a mounting opening 105 on a front side of the framework 103 . For the attachment of the fixed hinge body 132 by means of the assembly opening 105, the positions of these assembly openings 105 in the framework 103 are fixed by the manufacture of the framework 103, but these assembly openings 105 offer the advantage that as little leakage as possible, i.e. loss of cold air, occurs . The tightness of these assembly openings 105 is given on the one hand by the position of the assembly opening 105 in the framework 103 and on the other hand by the precise fit between the assembly bore 105 and the fixed hinge body 132 .

in the in 3c , shown embodiment, a fixed hinge body 132 is shown, which engages in a slot 104 to attach the cover plate 123 to the framework 103, in which the support arm 102 is also attached. Contrary to the first two in 3 In the embodiments shown, a small loss of cold air is possible at the slot 104, but the manufacturing cost of the stand frame 103 is reduced by the use of the slot 104 for the attachment of two assemblies - the fixed one.

Hinge body 132 and the support arm 102 - greatly simplified. The design of the rotatable hinge body 133 after 3 further allows the cover plate 123 to be completely detached from the refrigerated display case 101 when the cover plate 123 is fastened in the rotatable hinge body with a snap lock indicated in this figure.

4 shows an embodiment of the fixed hinge body 132 with a hook 106 attached to this fixed hinge body, by means of which the fixed hinge body 132 can be attached to the framework 103. Fastening takes place via a form-fitting connection between the elongated hole 104 and the hook 106, with the hook 106 being guided through the elongated hole 104 for assembly in accordance with the assembly sequence shown in the figure and then hooked into the stud frame 103. the inside 4 The fixed hinge body 132 shown also has a hinge bushing 135, in which a hinge pin 134, not shown, is fastened and enables the rotatable connection with the rotatable hinge body 133, also not shown.

5 also shows an alternative fastening option for a fixed hinge body 132, this hinge body 132 having a snap fastener 136, which in turn is inserted into the elongated hole 104 of the framework 103 and engages in the framework 103 in a form-fitting manner. This type of connection offers the advantage of preventing the fixed hinge body 132 from becoming unintentionally detached in the event that the cover plate 123 has to be completely removed from the refrigerated display case 101, for example for replacement.

Alternatively, the fixed hinge body 132, according to the in the 6 embodiment shown, are also attached to the framework 103 by means of a bayonet catch 137 . The bayonet catch 137, ie a rotatably lockable catch, is inserted into the assembly opening 105 for assembly and locked by rotating it through 90°, which also enables loss protection against the fixed hinge body 132 accidentally falling out during maintenance work. In the embodiments shown, it is also possible to fasten a fixed hinge body 132 either to a slot 104 or to a mounting opening 105 suitable for mounting, as can be seen immediately.

Another embodiment of a hinge 131 is in the 7 shown, wherein instead of a rotatable hinge body 133, a hinge bushing 135 is formed from the edge portion 138 of the cover plate 123. The hinge bushing 135, with which simplifies the production of a hinge 131 and a cover plate 123 and at the same time reduces production costs, engages around the hinge pin 134 for rotatably fastening the cover plate 123 to the fixed hinge body 132, with the hinge pin 134 preferably being connected to the fixed hinge body 132 in a rotationally fixed manner is. It is also conceivable in this embodiment that the hinge pin 134 is releasably connected to the fixed hinge body 132 or also in a non-positive manner, if necessary even with a material connection, to the hinge bushing. At the in 7 The illustrated embodiment serves the edge area 138, which is angled with respect to the actual cover plate 123, as a sealing edge, which increases the tightness of the entire cover plate in relation to the stud frame 103.

A similar design of the in 7 shown hinge bushing 135 is still in the 8th shown, with the hinge bushing 135, however, being located in the area of the cover plate 123 facing away from the framework 103. This configuration enables the cover plate 123 to be arranged between the stud frame 103 and the hinge 131, as a result of which the smallest possible air gap remains between the cover plate 123 and the stud frame 103 and losses through a gap between the cover plate 123 and the stud frame 103 are minimized. The hinge bushing 135 enclosing the hinge pin 134, like the support arm 102, is arranged on a side of the refrigerated display case 101 facing the goods compartment and is therefore visible from the outside if no cover elements are present. In this case, cover elements can be individual strips which only cover the hinges 131 . However, sealing strips can also be provided, which completely enclose the cover plate 123, which additionally allows for an attractive finish or an attractive cladding between the cover plate 123 and the support arms 102 or the framework 103.

For a cover plate 123 that is as attractive as possible and closes off as evenly as possible, a long sleeve 139 is also an alternative, as in the embodiment according to FIG 9 shown, usable. The cover plate 123 can be moved both translationally and rotationally via this hinge, which has two degrees of freedom, so that a uniform gap is created between this cover plate 123 and the support arms 102 on both sides of the cover plate 123 by means of this fastening system. The cover plate 123 is fitted according to the in 9 shown imaging sequence first moved away from the fixed hinge body 132 in the radial direction to the hinge pin 134, so that the sealing edge 141 located on the cover plate 123 gets a clearance. In the closed state, the sealing edge 141 rests on the framework 103 in order to prevent leakage. After the cover plate 123 has been unlocked by sliding, it is then possible to open this cover plate 123 by turning it, after which the necessary cleaning work on the cold air duct 111 can be carried out. In this embodiment, a hinge 131 that is particularly simple and economical to produce is also shown, with a fixed hinge body 132 that is formed in one piece with the framework 103 . The fixed hinge body 132 is preferably punched out of the material of the framework 103 or cut out by laser or plasma cutter and shaped accordingly, but the hinge pin 134 was also formed by means of shaping, just like the long sleeve 139 . Furthermore, the sealing edge 141 as well as the long sleeve 139 is formed in one piece with the cover plate 123 by forming. Furthermore, the cover plate 123 contains a closure 130 which is required to close the cold air duct 111 . It is also conceivable that, instead of the closure 130, a hook is attached to the sealing area 140 of the cover plate 123, which engages in an eyelet located in the framework 103 as soon as the cover plate 123 can engage by means of the translational locking mechanism explained above.

the 10 , 11 and 12 each show a longitudinal section of a refrigerated shelf 201 with a cold air duct 211 and a fan 212 located in this cold air duct 211. The cold air intake 210 in the floor area 219 of the refrigerated shelf 201 draws the air to be cooled out of the goods compartment of the refrigerated shelf 201 or from the Suctioned environment and also located in the cold air duct 211 heat exchanger 214 fed so that the cold air 217 can escape through the rear wall paneling 212 between the support arms or shelves 207 in the goods space.

The fan 212 and the heat exchanger 214 are in the embodiment according to FIG 10 between the rear wall 220 and the rear wall cladding 221 of the refrigerated section 201. A maintenance cover 242 is provided in the rear wall cladding 221 for accessibility to the fan 212 if cleaning or maintenance work is to be carried out on the fan 212. If the maintenance cover 242 is removed, the fan 212, the machine protective grille 247 and the dust filter 248 are accessible.

In the 11 The embodiment shown, with a fan 212 located in a cold air duct 211, shows a maintenance frame 243 instead of a maintenance cover 224, which can be rotated via a joint 244 on a wall of the cold air duct 211 is attached so that the fan 212, including its attachments, such as the machine protective grille 247, the dust filter 248 or an optional dust grille 249, can be opened. Consequently, accessibility to the fan 212 is guaranteed without components such as those in FIG 10 illustrated maintenance cover 242, must be dismantled. It is also conceivable that the joint 244 is provided at an upper end of the maintenance rack 243 in order to open the maintenance rack counterclockwise upwards, provided that the installation space in the goods compartment of the refrigerated display case 201 permits this.

Alternatively, the maintenance frame, as in 12 shown, can also be removed from the rear panel 221 via a carriage 245 . The carriage 245 thus enables the fan 212 located in the maintenance frame 243 to be pushed out of the cold air duct 211.

It is also conceivable for carriage 245 to be configured in such a way that carriage 245 is also rotatably attached to cold air duct 211 via a joint, carriage 245 closes cold air duct 211 when refrigerated display case 201 is in a closed state or operating state, and thus at the same time the function of a maintenance cover 242 takes over.

Another embodiment of a maintenance rack 243 is shown in FIG 13 , In this case the maintenance frame 243 is rotatably mounted via a joint 244, but the removal or opening of the fan 212 takes place via a rotary movement about a vertical axis of rotation. It is immediately apparent that a joint 244 on a maintenance frame 243 with a horizontal axis of rotation but also a carriage 245 after the 10 until 12 is advantageous for several fans 212 arranged next to one another. the 13 also shows three possible embodiments of a maintenance frame 243 mounted on a cold air duct 211. Thus, as in FIG 13b shown, only the fan 212 or the rotor 246 of the fan 212 may be attached to the maintenance frame. This configuration can be advantageous if a further cover, such as a maintenance cover 242, is provided on the rear wall cladding 221 of the cold air duct 211 anyway and the rotor 246 of the fan 212 is therefore not accessible from the outside when the refrigerated section 201 is in operation. If an additional machine guard 247 on the maintenance frame 243, as in the 13c shown, be required, so it is also possible that the machine guard 247 is not directly connected to the maintenance frame 243, but directly to the joint 244 instead. This has the advantage that the maintenance frame 243 can be opened or swung open separately from the rotor 246 without having to completely dismantle the machine protective grid 247, and the machine protective grid 247 can also be swung open for maintenance and/or cleaning purposes. A further advantage of the independent rotary connection of the machine protective grid 247 also results in connection with a dust filter 248, as in 13d shown. It is thus possible to detach the protective machine grille 247 from the rotor 246 of the fan 212 and to attach or replace a dust filter 248 on the side of the protective machine grille 247 facing the rotor 246 . If necessary, the dust filter 248 can also be accommodated in a dust grille 249, which in turn can be inserted in the space between the machine protective grille 247 and the rotor 246 or, alternatively, forms a unit with the machine protective grille 247 or is designed as a machine protective grille 247. By using a common pivot point for the protective machine grille 247 and the maintenance frame 243 on the joint 244, the number of components and also the number of actions to be carried out during maintenance or cleaning can be minimized.

In 14 the components of a refrigerated shelf surrounding the cold air duct 311 are shown in a perspective view. Here, the cold air duct 311 is enclosed by the rear wall 320, the rear wall cladding 321 and two stud frames 303. The rear wall covering 321 has a number of cooling openings 351 through which cold air can flow from the cold air duct 311 into the goods space in order to cool the goods provided on the shelves 307 . The shelves 307 in turn rest on the support arms 302, which in turn are attached to the uprights 303. At least one row of holes 352 is provided in the framework 303 for fastening the support arms 302 . The performance of the refrigeration machine used for cooling and the amount of cold air flowing through the cold air duct 311 is usually precisely matched to the size of the refrigerated shelf or the goods compartment of the refrigerated shelf, which is why the cooling openings 351 of the rear wall paneling 321 have a defined arrangement or a defined size . However, the rows of holes 352 required for the assembly of the support arms 302 simultaneously represent further openings through which cold air also escapes from the cold air duct 311 .

In order to prevent the unwanted escape of cooling air from the cooling air duct 311, in the pillar works 303, as in the 15 until 18 shown, a seal 353 is provided. In a stud frame 303, which usually consists of a longitudinal profile or a folded sheet metal, the seal 353 is in a space designed as a groove between the sides wall 357 and the support wall 358 are provided. The seal 353 thus seals the row 352 or the slots 304 located in the front wall 356, in which the support arms 302 are fastened by means of a hook 306.

In the 15 and 16 a one-piece seal 353 is shown in each case. The profiled seal, which can be available as rods or meter goods, is in the simplest case, as in the 15 and 16 shown, only clamped between the support wall 358 and the side wall 357, ie positively connected. The air flow in the cooling air duct advantageously exerts additional pressure on the seal 353, so that there is no need to attach the seal to the framework 303 in a form-fitting manner. Furthermore, the seal is at a distance from the front wall 356 of the framework 303 so that the hook 306 of the support arm 302 does not damage the seal 353 during assembly. The one in the 16 Seal 353 shown has only one recess for this purpose, with the in the 15 seal 353 shown is spaced from the front wall 356 of the stud frame 303 over its entire width.

Instead of a one-piece closed seal 353, however, one can also be used, for example in FIG 17 shown, seal 353 with a sealing lip 354 can be used. The use of the sealing lip 354 on the seal 353 thus enables the seal 353 to rest on the front wall 356 of the stud frame 303 . The hook 306 of the support arm 302 can consequently pierce the seal 353 when the support arm 302 is installed, the closable sealing lips 354 reliably maintaining a sealing effect at the point of puncturing and preventing the cold air from leaking through the elongated holes 304 . It is conceivable that the sealing lip 354 is made in two parts or is merely made by a cut in the flat surface of the one-piece seal 353 . A sealing lip 354 that is merely a cut in the seal 353 can thus be provided at the level of an elongated hole 304 of the row of holes 352 and does not have to run over the entire length of the seal 353 .

Furthermore, in 18 a final seal 355 for a seal 353 is shown, by means of which openings located at the end of the seal 353 are additionally sealed. The opening between the seal 353 and the front wall 356 closed by the closing seal 355 results from the fact that the seal 353 is spaced from the front wall 356 because of the mounting of the brackets 302 and the hooks 306, in order to prevent the aforementioned damaging of the seal 353 to avoid. It is also immediately apparent that a seal after the in 17 illustrated embodiment does not have to be additionally sealed at its end by a closing seal 355 if the sealing lips 354 are designed in such a way that they rest on the back of the front wall 356.

Another embodiment of a refrigerated shelf 401 is in 19 shown, wherein the refrigerated shelf 401 has a bottom air duct 463 in addition to the cold air duct 411 . Using the floor air duct 463 shown, it is possible to create the double sealing air curtain shown, consisting of the known cold air curtain 416 and the floor air curtain 470, in order to shield the goods space of the refrigerated section 401 from warm ambient air better than would be possible with a single sealing air curtain. The one in the 19 Ventilation losses of the cold air curtain 416, which are not shown separately, generally lead to the installation room or the area immediately in front of the refrigerated section 401 cooling down Floor air intake 462 sucked into the floor air duct 463 and conveyed through the floor area 419 of the refrigerated section 401 by means of the floor air fan 467 to the ceiling area 422 of the refrigerated section 401. The floor air 461 located in this ceiling area 422 of the refrigerated display case 401 is fed to the floor air curtain 470 through nozzles 469 located in the floor air supply 468 .

In order to regulate the temperature of the bottom air curtain 470, it may also be necessary to add warm air 465 to the bottom air 461. For this purpose, above the floor air intake 462, in the exemplary embodiment 19 in a rear wall area of the refrigerated shelf 401, a warm air intake 464 is provided. The hot air intake 464 includes the throttle 466 for control purposes, which controls the amount of hot air 465 sucked in.

The cold air curtain 416 is generated as in 1 already shown, via the fan 412 located in the cold air duct, which sucks in air via the cold air intake 410 and promotes the cold air flow 413 generated in this way through the heat exchanger 414 into the ceiling area 422 of the refrigerated display case 401. At the same time, as also explained above, the cold air 417 exits at the rear wall paneling 421, which cools or keeps goods that are not shown on the shelves 407 cool.

To provide the floor air curtain 470, the in 20 illustrated bottom air supply 468 in the ceiling area 422 of the refrigerated section 401 seen, the bottom air supply 468 is preferably carried out over the entire width of the refrigerated shelf 401. In contrast to this, the bottom air duct 463 is designed with a smaller width in order to make the production of the bottom air duct 463 economical and to reduce the installation space to a minimum. Thus, the floor air duct 463 widens in a funnel shape downstream of the floor air fan 467, so that the floor air supply 468 can be carried out over the entire required width.

the 21 until 25 each show configurations of a heat exchanger 514 through which the cold air 517 flows, the cold air 517 being cooled on the cooling fins 571 and cooling coils 572 while it flows through the heat exchanger 514. In all of the embodiments, the cooling fins 571 are arranged in parallel planes and are preferably integrally connected to the cooling coils 572 running perpendicular to the cooling fins 571 in order to transfer the cooling capacity provided by the cooling coils 572 to the cooling fins 571 and consequently to the cold air 517 as effectively as possible. The cooling coils 572 are in this case formed by a continuous tube which has deflections 573 on the last cooling fin 571 in each case.

In the 21 the cooling fins 571 are formed from flat metal sheets, so that the cold air 517 preferably flows in a laminar manner through the heat exchanger 514 and is only deflected at the cooling coils 572, possibly forming a turbulent flow. However, the formation of turbulent flow at the cooling coils 572 preferably occurs in a plane parallel to the planes of the cooling fins.

In order to deflect an air flow consisting of the cold air 517 also to a fin surface, the cooling fins 571, as in FIG 22 shown, interfering tabs 574 are provided. In contrast to the cooling coils 572, the disruptive tabs 574 produce a preferably turbulent flow in the air flow, which is able to influence the laminar boundary layer of the flow on a fin surface but also the thermal boundary layer in such a way that the wall heat transfer at the Cooling fins 571 is positively influenced or increased. The interfering tabs 574 are in the in 22 illustrated embodiment formed in one piece from the sheets of the slats 571. The production of the interfering tabs 574, for example by stamping, offers the possibility of constructing these interfering tabs 574 in a particularly cost-effective manner. Furthermore, the opening formed by punching in a cooling fin 571 can lead to a further deflection of the flow of cold air 517, as a result of which the heat transfer from the cooling fin 571 to the cold air 517 is further improved.

Alternatively, a spoiler 574, as in 23 shown, are placed on the cooling fin 571 by means of a joining method. In the 23 The illustrated embodiment shows interfering tabs 574 which are attached to the cooling fins 571 by means of spot welds 575, i.e. materially. The integral connection also has a positive effect on the function of the interfering tabs 574, since the interfering tab 574 in this case, but also in the exemplary embodiment explained above, according to 22 , not only the flow of the cold air 517 but also the temperature of the cold air 517 because it is at substantially the same temperature as the cooling fins 571.

As in 24 shown, a heat exchanger 514 can also be designed in such a way that instead of using disruptive tabs 574, the cooling fins 571 have periodically arranged deflection edges 576. The deflection edges 576, as also shown in 25 are shown, also deflect the flow of cold air 517 in such a way that a velocity component orthogonal to the planes of the cooling fins arises in the flow of cold air 517 . Also the ones in the 24 and 25 The cooling fins 571 shown with the deflection edges 576 offer the possibility of providing a heat exchanger 514 in a particularly cost-effective manner, since the deflection edges 576 are formed by pressing or bending the sheet metal used for the cooling fins 571.

The one in the 25 illustrated arrangement of the cooling fins 571 also allows, in contrast to the arrangement 24 to accelerate the flow of the cold air 517 additionally along the flow direction of the cold air 517 and to decelerate it again, so that additional turbulences arise in the flow. For this purpose, the cooling fins 571 are as in the embodiment according to FIG 24 also, arranged in parallel planes but offset along the direction of flow of the cold air 517 . The periodically or regularly shaped cooling fins 571 are arranged offset in relation to their neighboring cooling fins 571 by half a wavelength or by the longitudinal spacing of two interfering edges 576 .

the 26 shows an embodiment of a refrigerated shelf or a section of a refrigerated shelf in longitudinal section with a function tester 681, which is arranged in the vicinity of the fan 612 in the cold air duct 611. The function indicator 681 attached to the rear panel 621 is used to monitor the function of the fan 612, with the function indicator 681 flows around or through which the cold air flow 613 flows. The cold air flow 613 flowing through the heat exchanger 614 must be present to a sufficiently high degree or with a sufficiently high air flow in order to maintain the cooling of the goods located in the goods compartment of the refrigerated shelf. A malfunction of the fan 612 is thus reliably displayed via the function indicator 681, which is easy to perceive visually. For this purpose, the function indicator 681 is placed at a suitable point in the rear panel cladding 621 . Depending on which of the function indicators 681 explained below is used, the function indicator 681 is placed upstream or downstream of the fan 612 . However, placing the function indicator 681 in the floor area 619 of the refrigerated section is also conceivable.

A detailed representation of a function indicator 681 with a signal body 682 is shown in FIG 27 , 28 and 29 . In this case, the signal body 682 can be displaced along a vertical axis, with a color panel 683 located on the signal body 682 being able to be seen from the outside through the viewing window 685 if the signal body 682 is in its upper position. In a state of rest, the signal body 682 initially rests in a lower position on the seat edge 684, with an opening for receiving the air pressure always being present on the underside of the signal body 682 designed as a piston.

In the after 27 In the function indicator 681 shown, the lower opening designed as a pressure opening 686 is located within a tube which is directed in the opposite direction to the flow of cold air 613 . The cold air flow 613 thus causes a dynamic pressure on the underside of the signal body 682 caused by the flow velocity, which is able to lift the signal body 682 against the force of gravity, since only the static pressure of the cold air flow 613 is present on the upper side of the signal body 682. The compensating opening 687 is therefore attached to the function indicator 681 at a point at which no dynamic pressure or negative pressure caused by the cold air flow 613 is present. Thus, in this embodiment, the function indicator 618 acts as a speed gauge.

If only the static pressure of the cold air flow 613 is available due to the installation position of the function indicator 681, the function indicator 681 can be used as an overpressure indicator 28 , to be executed. In this case, the pressure opening 686 is also arranged below the signal body 682 in the function indicator 681, with only the static pressure of the cold air flow 613 acting on the pressure opening 686. The upper side of the signal body 682 is connected to the environment via the compensation opening 687, as a result of which the signal body 682 is lifted against gravity by the positive pressure drop. As in the exemplary embodiment above, the pressure applied to the signal body 682 can be identified qualitatively from the outside via the color chart 683 on the viewing window 685 .

The function indicator 681 post-processes in a similar way 29 , this function indicator 681 being used as a negative pressure indicator. Contrary to the embodiments according to the 27 and 28 this function indicator is 681 after 29 located upstream of the fan 612. In this embodiment, the function indicator 681 has a suction opening 688 above the signal body 682, to which the negative pressure acting by the fan 612 is applied. A pressure drop occurs on the signal body 682 via the compensation opening 687 directed into the environment, as a result of which the signal body 682 is raised and the color chart 683 becomes visible in the viewing window 685 .

the inside 30 The function pointer 681 shown essentially corresponds to the function pointer 29 . Only the compensating opening 687 points downwards, so that the risk of contamination can be minimized. The compensating opening 687 is arranged pointing downwards in a screen, which ultimately leads to a rear wall cover 621 (cf 29 ) can be set up.

An alternative embodiment of a function indicator 681 is shown in FIG 31 shown, with the function indicator 681 having a flap 690 which is raised by the flow of cold air 613 . The flag 689 fastened to this rotatably mounted storage flap 690 carries the color chart 683 on its surface, which in turn becomes visible in the viewing window 685 if the fan 612 malfunctions.

Also the in 30 The function indicator 681 shown is arranged to display the function of the fan 612 in the rear paneling 621 of the refrigerated section, in a clearly visible place. The positioning of the flapper within the cold air duct 611 is conceivable both upstream and downstream of the fan 612 since the function indicator 681 according to this embodiment is only able to display the flow rate of the cold air flow 613 the amount of air conveyed.

Such function indicators can in particular be designed as separate assemblies and inserted into a wall of the refrigerated section. This simplifies installation and also enables existing refrigerated shelves to be retrofitted. The function indicators enable the air flows to be checked easily at almost any point within the refrigerated section. In particular, individual airways, such as the airways of individual fans, if a plurality of fans are provided in the refrigerated section, can also be individually checked or monitored.

This in 32 The refrigerated display case 701 shown also has support arms and shelves 707 carrying these support arms, a cold air intake 710, a cold air duct 711 and a fan 712 and a heat exchanger 714, the latter leading to a cold air supply 715, by means of which a cold air curtain 716 made of cold air 717 can be provided. It goes without saying that—depending on the specific embodiment—the support arms and the shelves can be designed in one piece in all of the above exemplary embodiments. Possibly, cumulatively or alternatively, the support arms can also be designed in one piece with parts of the framework or the assemblies forming the cold air ducts, which, however, leads to losses in variability and on the other hand also completely avoids sealing problems at this point.

The refrigerated shelf 701 also has a floor area 719, a rear wall 720 and a rear wall cladding 721, through which cold air 717 can also get into the goods compartment, and a ceiling area 722.

In addition, the refrigerated shelf 701 has a covering device 795 which, in this exemplary embodiment, is designed as an insulating curtain 797 that is wound up on a rolling body 796 . The insulating curtain 797 also has a cover strip 798, through which the circulating air flow can be regulated or reduced in a simple and reliable manner when the cover device 795 is lowered.

A specific alternative for designing the refrigerated display case 701 is disclosed 33 , in which a separate cover strip 798A can be placed on an exhaust grille 794, which is provided above the cold air intake 710. Here, the cover strip 797A is formed separately from a corresponding insulating curtain 797A.

Alternatively, the cover strip 798B can also be connected to the insulating curtain 797B so that both assemblies can be actuated and positioned at the same time, like this one 34 represents as an example. In this exemplary embodiment, the cover strip 798B is provided with openings, which are not numbered in any more detail, through which the air circulation can be considerably restricted and reduced to a minimum.

The latter also applies to the cover strip 798C, which is also connected to the insulating curtain 797C, as shown in 35 7, in which embodiment the insulating curtain 797C is attached off-center to the cover strip 798C. In addition, this exemplary embodiment has a tongue and groove system 799, with the tongue 799B being provided on the cover strip 798C and the groove 799A being provided on the floor area 719 or on the suction grille 794, which protectively covers the cold air intake 710. Here, the tongue and groove system 799 ensures a secure fit on the one hand and also leads to easy locking. On the other hand, an exact positioning of the cover strip 798C is ensured, so that its openings can take effect as intended. In addition to this, a magnetic lock or some other latching connection can also be provided.

At the in 36 and 37 In the embodiments shown, a tongue and groove system 799 is also provided, with the cover strips 798D, 798E being narrower than the suction grille 794, so that a perforated area can be dispensed with. Here, in particular, the tongue and groove system 799 ensures that the cover strips 798D, 798E are precisely aligned, which can also be done in the aforementioned embodiments by lowering the suction grille 794, in that the wall of the floor area 719 then ensures appropriate positioning at this point .

Also in the embodiments according to 36 and 37 the insulating curtains 797D, 797E are connected to the respective covering strips 798D, 798E.

Deviating from the other embodiments, in the embodiment 37 the wall of the bottom area 719 has the tongue 799B, which engages in a groove 799A of the cover strip 798E.

As in 38 until 41 As shown, roller 796 may be mounted on ceiling portion 722 as roller 796A (see Fig 38 and 39 ) or in front of the ceiling area 722 as rolling body 796B (see 40 and 41 ) be arranged.

Reference List

101

cooling rack

102

Beam

103

stud frame

104

Long hole

105

mounting hole

106

hook

107

shelf

110

cold air intake

111

cold air duct

112

fan

113

cold air flow

114

heat exchanger

115

cold air feed

116

curtain of cold air

117

cold air

118

loss of cold air

119

floor area

120

back panel

121

rear wall covering

122

ceiling area

123

cover plate

130

closure

131

hinge

132

solid hinge body

133

rotating hinge body

134

hinge pin

135

hinge bushing

136

snap closure

137

bayonet lock

138

edge area

139

long socket

140

sealing area

141

sealing edge

201

cooling rack

207

shelf

210

cold air intake

211

cold air duct

212

fan

214

heat exchanger

217

cold air

219

floor area

220

back panel

221

rear wall covering

242

maintenance coverage

243

maintenance rack

244

joint

245

sleds

246

rotor

247

Machine guard

248

dust filter

249

dust grid

302

Beam

303

stud frame

304

Long hole

306

hook

307

shelf

311

cold air duct

320

back panel

321

rear wall covering

351

cooling opening

352

row of holes

353

poetry

354

sealing lip

355

sealing plug

356

front wall

357

Side wall

358

retaining wall

401

cooling rack

407

shelf

410

cold air intake

411

cold air duct

412

fan

413

cold air flow

414

heat exchanger

415

cold air feed

416

curtain of cold air

417

cold air

419

floor area

420

back panel

421

rear wall covering

422

ceiling area

461

ground air

462

bottom air intake

463

bottom air duct

464

warm air intake

465

warm air

466

throttle

467

floor air fan

468

bottom air feed

469

nozzles

470

bottom air curtain

514

heat exchanger

517

cold air

571

cooling fin

572

cooling coil

573

deflection

574

spoiler tab

575

spot weld

576

deflection edge

611

cold air duct

612

fan

613

cold air flow

614

heat exchanger

619

floor area

620

back panel

621

back cover

681

function indicator

682

signal body

683

color chart

684

seat edge

685

viewing window

686

pressure port

687

compensation opening

688

suction port

689

banner

690

flap

691

pivot point

701

cooling rack

707

shelf

710

cold air intake

711

cold air duct

712

fan

714

heat exchanger

715

cold air feed

716

curtain of cold air

717

cold air

719

floor area

720

back panel

721

rear wall covering

722

ceiling area

794

suction grid

795

covering device

796

rolling body

796A

rolling body

796B

rolling body

797

insulating curtain

797A

insulating curtain

797B

insulating curtain

797C

insulating curtain

797D

insulating curtain

797E

insulating curtain

798

cover strip

798A

cover strip

798B

cover strip

798C

cover strip

798D

cover strip

798E

cover strip

799

tongue and groove system

799A

groove

799B

feather

Claims (5)

Cooling shelf with an air supply for generating an air curtain, the air supply having at least one air duct and at least two fans, characterized in that the fans each have independent means for checking the function of the respective fan. refrigerated shelf after claim 1 , characterized in that the means for a functional check includes monitoring of an air flow generated by one of the two fans. Refrigerated display case with an air supply for generating an air curtain, the air supply having at least one air duct and at least one fan, characterized in that an air flow monitor has a mechanical display. refrigerated shelf after claim 3 , characterized in that the mechanical display comprises a color coding. Refrigerated display case with an air supply for generating an air curtain, the air supply having at least one air duct and at least one fan, characterized in that an air flow monitor has a dynamic pressure display, an air resistance scale, an air flow speed display, a vacuum display and/or an overpressure display.

Images