DE1501282A1 - Cool showcase - Google Patents

Description

PATENT ADVERTISEMENT DtPUINO.

'HELMUT GORTZ

6 Frankfurt am Main 70 W "H-" hoWr. 27-TaL Al 707 »

9 November 1966 Gzf / g

Litton Industries, Inc., 336 North Foothill Hoad, Beverly Hill, California 90213, U.S.A.

Refrigerated display case The invention relates to a refrigerated cabinet, in particular refrigerated

Showcase for holding foodstuffs and the like and in particular on a refrigerated showcase, in which the cooling air flows out into the surrounding area immediately in front of the titrine. an air curtain prevents the heat transfer and the mixing of the cooled air in the Vltrinengehäuee keep the ambient air to a minimum KU «

Vertical refrigerated cabinets or showcases with an access opening at the front are well known and commercially available. Such refrigerated showcases are for sale by, for example, refrigerated Foodstuffs, with the clay display cases easily accessible to customers. Customers can use the chilled See and select products in the showcase. You can duroh reach through the access opening and remove the product without first opening an insulating door or lid have to. ·

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Refrigerated cabinets of this type would normally be a 2urecheete.llungeraiun with a look! horizontal, vertically stacked compartments on »The food is placed on the Shelves stored. The temperature, next to the boards, is often kept at or below about -16 ° C, vanrend die Ambient temperature outside the showcase inside the shop Can be 21 * C or more. Cold or cooling air is used Showcase roughness is fed to the shelves through outlets either via or gate. Pie cooling air cascades generally forward and downward through the showcase space and becomes circulated again by a suitable cooling device and returned to the cabinet.

With such a refrigerated cabinet, the cooling air flowing down through the access opening in the cableway touches the ambient air outside the showcase and there is probably an exchange of heat and a mixture between the cooled cold air and the effluent air goes beyond the volume of the circulation system of the KUhIo> ÖbeIe, see below, which is why the amount of cold air can exceed the capacity of the refrigeration unit and flows out of the unit and the bottom of the unit and forms a “ cold” one there . The cold air in this Int zone is uncomfortable for potential customers. In addition, there is the further problem that the effectiveness is reduced by JCälteverluet and mixing between cooled air and ambient air.

BADORJQINAL

eemt / oiie

Ea has already been tried (USA patent 3 125 864),

solve the cold zone problem so that the mixture from Cooled cold air and ambient air is flushed and led out of the cabinet room from the side. The present invention relates to an "improved" refrigerated display case, with which the cold zone usually present in front of conventional showcases is greatly reduced or even avoided vriLrd. The invention comprises arrangements for the formation of a central curtain between the cooled cold air and the ambient air. When the air curtain is circulated, a « Tapping provided in the curtain air duct. A part of the ventilating air contains some ambient air which is removed from the cooled air, while the gate air air along the access opening has been moved, has mixed «is thus either led out of the showcase housing, or downwards in the direction of a moved to a certain point in order to reduce condensation on the housing. A troublesome part of the curtain air is either out one or more curtain air outlets down across the access opening is led out, or is split open again, with a part again in the direction of a predetermined position is performed to act as a cooling device, for example to cool fluorescent lamps or their parts.

The object of the invention is to create an improved, upright refrigerated display case in which the undesired overflow of Cooled cold air adjacent to the bottom of the access opening in the refrigerated display case is reduced or prevented, inter alia thereby a warmer, more comfortable area in the room, adjacent to the To create the front wall of the refrigerated display case.

9098 * 1/0186

As a result of essential features of the invention, the refrigerated display case has an improved overall efficiency of cooling _{or the like}

Further features, advantages and objects of the invention result from the following description in conjunction with the drawing ο

Ss shows:

Flg. 1 is a vertical sectional view through an embodiment a standing refrigerated showcase according to the invention,

FIG. 2 is a plan view of the showcase according to FIG. 1,

Flg. 3 is a partial vertical section of another embodiment of the curtain air duct system of a refrigerated showcase according to FIG Invention,

FIG. 4 shows a view similar to that according to FIG. 3, but showing another embodiment of the curtain air ducts,

FIG. 5 is a view similar to that of FIG. 3 old representation the arrangement of a heating device in a part of the curtain air duct and

Fig. 6 is a partially vertical sectional view of another

Embodiment of the invention in which a living air duct is provided to provide an arrangement for prevention to create condensation water.

With reference to FIG. 1, a standing refrigerated display case according to FIG Invention designated by 10. The refrigerated showcase 10 has a front door Access opening 11, the side walls 12 of an upper front

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wall 13 and a lower front wall 14 is limited. The cooled showcase 10 has vertically spaced apart boards 15, two of which are shown, and a lower board or floor 16. Of course, the invention is not limited to the number and type of floor boards.

A customer can reach into the interior of the refrigerated showcase 10 and Take out refrigerated packs of goods P 1, P 2 and P 3 that are on the bottoms 15 and 16 lie.

Cold air is supplied to the showcase room in which the food packages P 1, P 2 and P 3 lie. The cold air is duroh an upper supply chamber 17, which is immediately below an upper one Isolating wall 18 is arranged and also by swei lower feed casings 19 supplied, which are located directly below the floors 15. Each of the chambers 17 and 19 has a number of perforations 20 in their bottom wall, through which the cold air flows out *

Cooled cold air is supplied to the chambers 17 and 19 from a rear supply channel 21 which extends adjacent to the inside of the rear insulating wall 22 of the showcase housing 10. The supply channel 21 is in communicating connection with a lower return channel 23, which is adjacent to a lower insulating wall 24 of the refrigerated display case housing 10. In a similar way, the lower return channel 23 communicates with a discharge channel 25 which is arranged adjacent to an isoller partition 26 within the lower front part of the showcase . The inlet channel 25 has an inlet opening 27, which in this case

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It?

Version with a perforated inlet plate 2 ^ Vereenen iet. The channels 21, 23 and 25 form the channel system for the cooled Air c

Cold air is drawn in through the openings in the inlet plate 28, the the inlet opening 27 forms »sucked in by means of a blower 29. The circulated cold air passes through the inlet duct 25 lower return channel 23 and is then through one or more Cooling coils 30 pressed in order to cool the air down to a desired temperature, in order to reduce the temperature to the inside of the cabinet space adjacent to the floors 15 and 16, for example at -18 C.

to keep.

Refrigerant is supplied to the cooling coils 30 and a corresponding, not shown, refrigerant, which is usually located at a distance and has a sufficient capacity to supply a number of coils 30, among other things. The first cooling coil set * is dimensioned so that the air temperature is cooled below the dew point in order to remove as much moisture as possible. This essentially avoids the formation of frost or condensation on the second snake. The cooling coils 30 are periodically defrosted with the waste water, which is discharged through a suitable ink discharge line 31; after cooling, the cold air is pushed up through the supply duct 21 and into the chambers 17 and 19. The cold air then flows out of the chambers 17 and 19 into the interior of the showcase, in which the cooled food packages 1 1, ¥ 2 and T 3 are present.

9 0 9 8 4 Ö / α 18 6 orjginal inspected

This cold air then flows further downwards and outwards in Towards the front wall of the housing and then re-enters the inlet port 27 to repeat the cycle described.

^It has now been found that the cooling efficiency can be increased by using at least one air curtain in front of the inner cold air flow. The intermediate air curtain or several such curtains serve as a thermal barrier between the internal cold air and the surrounding room air. Like in Pig. 1 Let an air curtain channel be illustrated as follows: The air curtain channel has a curtain air inlet opening 36 adjacent the bottom of the access opening 11. Preferably, a longitudinally extending perforated cover 37 is provided in the form of an inlet rail, which covers the air curtain inlet 36. The air curtain inlet 36 merges into a front channel 38 which extends adjacent parts of the lower front wall 14 and the insulating partition wall 26 and is delimited by these walls. The front channel 38 merges into a floor channel 39 which lies adjacent to the lower insulating wall 24 and the floor 40 of the refrigerated display case 10. A rear curtain air duct 41 is located adjacent to the outside of the rear insulating wall 22 and communicates with the floor duct 39 and an upper curtain air duct 42 which is adjacent to the upper Iwolierwand 18 and the top wall 43 of the showcase 10. An air vox'har.ijsautrlaß 44 is provided on the upper curtain air duct 42 and is adjacent the top of the access opening

9 0 9 θ 4 9/0 f Ö έ

Air is discharged from the curtain air outlet 4-4 so that calibrated a curtain forms between the cold air inside the showcase space and the ambient air outside the showcase 10. Ee is it has been found that it is favorable to remove the curtain air from the Output outlet 44 at a relatively low speed, so that the air curtain indicated by the arrows 35a in FIG is, the inner cold air path, which is illustrated by the arrows 35b in Fig. 1, covers and both air currents naked pour down into their respective inlets. It is also found been that when the internal cold air has a temperature between -18 ° C and -25 ° C and the external ambient air has about 21 C, the intermediate air curtain 35a for example

O '

should be kept at + 7 C. A second fan 45 is in the air curtain duct system, for example on the junction the rear channel 41 and the upper channel 42 are provided, to circulate the curtain air at suitable speeds.

The insulating tape 18, 22, 24 and 26 serve to reduce the heat transfer between the air flows in the inner cold air ducts 21, 23 and 25 and the outer curtain air ducts 38, 39, 41 and 42 _β

IDb it is clear that when the air curtain moves outwards and the air curtain inlet 36 is received, ambient air from the space outside the refrigerated display case 10 is influenced, according to to flow below and mix with the curtain air and thus enter the curtain air inlet 36 at the same time. This introduction of ambient air into the system continues

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continuously, during each circulation of the curtain air, and the amount of the mixture gradually becomes so large that part of the mixture flows over an inlet rail cover 37 and creates a cold zone, ie an unpleasant area in front of the front wall 14 of the refrigerated display case.

According to the invention, an air dispensing device is provided in the curtain luftkans.laystern. With reference to the Pig. 1 and 2 of the present embodiment , a matching rectangular shaped tap opening 46 is provided in the top wall 43. Yorsugsweise is -a pusher 47 with a pair of handles 48 in Schlitsen 49 of the back wall 43 and out over forth, and therefore adjustable * The adjustable vane is therefore provided to regulate the area of the dispensing opening 46 au. The slide 47 can be moved between a closed position and an open position by means of the handles 48, which are shown in broken lines in their various end positions in FIG. The opening 48a represents the handles in the closed position of the slide 47 and the reference number 48b indicates the position of the handles in the open position of the slide 47 »

Part of the curtain air entering the curtain air inlet opening -36 is blown out through the tap opening 46. The real part of the curtain air continues its movement through the upper curtain duct 42 and at least a portion of this air is forced out through the air curtain outlet 44 to form an air curtain 35a (Pig. 1) BU _o

90 * 149/0118

Because the air curtain provides a certain additional amount of room air just as the cooled air takes in during movement to the inlet 36, more air will typically be passed through the inlet port sucked in than is discharged through the outlet 44. However, the overflow of the inlet rail cover 37 is minimized downgraded or physically completely switched off by the invention the 2apf opening 46 is provided, through which excess air is pressed out, which is why the exact Crowd at Au? .Aß 44 is led out to a balanced LuftTorhangsyatem au create that itself within the Maintains walls of the showcase. In practice, the effective area of the tap opening 46 is set by moving the slide 47 is regulated until curtain air flowing over inlet rail cover 37 is either minimized, or at all no longer occurs.

In the pig. 1 and 2 are fluorescent tubes 52 with ballet units 53 mounted in a sofa bed 54, which is inside and adjacent the top wall 13 of the refrigerated showcase 10 is located.

Its separating or dividing device is in the upper air curtain duct 42 provided. In the embodiment according to FIG. 1, a horizontally extending partition 55 is in the upper one Channel 42 arranged dividing the channel into an upper section 56 and a lower section 57. A perforated vertically Plate 58 is arranged in the upper section 56 adjacent to the sofa 54. In this embodiment, a first part occurs the remaining amount of curtain air into the upper section 56

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a, then passes through the perforated plate 58 and serves to cool the ballast units 53. A large part of the reed amount of curtain air enters the lower section 57 and is pushed out through outlet 44 to form the air curtain indicated in Fig. 1 old 35a. at this embodiment is the output through the dispensing opening 46 Air is decreased by an amount approximately equal to the amount of air passing through the upper portion 56 and serves to cool the ballast units 53.

A slightly modified air curtain duct system is shown in Flg. shown. In this embodiment, a horizontally extending channel 60 protrudes with the upper air curtain channel 42 a perforated plate 61 in communication. The channel 60 has a longitudinally extending outlet opening 62, which is provided on its lower side. Curtain air now moving forward into the upper duct 42 is divided so that part of the divided air flows downward and is discharged through the curtain air outlet 44a and another portion of the flow is output downwardly through the outlet opening 62 of the channel 60. These two amounts of air which are led out through the opening 62 and the outlet 44a, form two laminar air curtains, which the cold cooling air, which for example sent from the upper supply chamber 17, separate room air from the surroundings. Bs has been found that through the division of the curtain air space a more effective one Thermal insulation is achieved.

909849/0116

An example of actual air temperatures during a typical Operation is as follows:

The temperature of the cold air exiting the upper supply chamber 17 is about -24 C; the temperature of the air curtain formed at outlet 44a is about + Y ⁰ G; the temperature of the air curtain at the outlet opening is 16 ⁰ G and the temperature of the ambient air is approximately

Pi ^. Figure 4 illustrates another embodiment of the air curtain stone. In this embodiment, the upper air curtain channel 42 is in a upper portion 56a and a lower portion 57a by means of. divided by a partition 55a. The air flow inside of the upper channel 42 is split up and ^ enters the first part enters the upper section 56a, passes through a perforated plate 58a and is used to cool the ballast units 53 inside the festoon 54 "A" further part of the air flow passes through lower section 57a, part of which through curtain air outlet 44b and another part through an adjacent outlet opening 62a, which is delimited in a front channel wall 65. The through the Air discharged from outlet 44b and port 62a forms adjacent air curtains which move downward and into the air curtain inlet port 36 (Pig. 1) enter.,

Fig. 5 shows a slightly modified version of the above-described version according to Pigo 3. In this modification, heaters are

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Tongues are provided in order to heat part of the air flowing through the upper air curtain duct 42. In this particular embodiment, a longitudinally extending electrical heating element 64 is provided within the horizontally extending channel 60. However, the element 64 can be disposed within the upper air curtain duct 42. Different types of hot element * can be used in place of the electric heating element. For example, a high-temperature medium line can be used by the refrigeration system. In this embodiment, the air exiting the outlet opening 62b is warmed and, if this is desired when using this embodiment, the amount of air which is drawn out through the tap opening 46 (FIG. 1) can either be reduced or the value KuIl. The warning outer air curtain, which is formed by the air emitted from the outlet opening 62b, moves downwards and, if the capacity of the front air curtain duct 38 and the fan 45 is exceeded, over the inlet rail cover 37 If the air is warmed up, it does not create an uncomfortable zone in the puöboden area in front of the refrigerated display case.

Another modification of the present invention is shown in FIG. In this embodiment, a tap housing 66 is attached to the top wall 43 of the cooled showcase. This tap housing is in communicating connection with the upper air curtain channel 42 through the tap opening 46 passed through the opening ₀

909849/0106

, ι? ■ ·

The dispenser housing 66 has an outlet nozzle or opening 67 which directs bleed air downward adjacent the rear air curtain duct 41 of the air curtain system. It has been found that when the temperature of the air flowing through the rear curtain duct 41 is lower than the dew point of the surrounding air, condensation water is formed on the outer wall surface of the duct 41. Although even the bleed air discharged through opening 67 actually has the same dew point as the air within duct 41, the movement of bleed air past the outer surface of duct 41 precludes or reduces the build-up of moisture on the surface such an education is essential

The above description relates only to examples ο modifications and developments within the scope of the invention fall under the scope of protection.

909849 / Q1Ä *

Claims (5)

[Beligel ^ plaV '*' 01282 May not be changed patent claims 1. Refrigerated showcase, in the display room of which there are cooling Food stored bind and the one front access » Has opening for the interior space, which continues to have at least « has two rows of inner cannulas, one of which is a cooling device having, with air Ufflwälzbar iet through the inner channels. A cooled air flow through the display room to create that continues to have one or more rows of additional inner channels including one Device to circulate the air at a temperature between the temperatures of the cooled air and the surrounding air Has indoor air to an air flow adjacent and outside of the cooling air flow in order to obtain an air curtain between the cooling air flow and the ambient room air, characterized by at least one tap opening (46) in an upper canal (42 ^ of the heat on additional canals (38, 39, 41, 42). 2. Refrigerated showcase according to Anopruch I, characterized by an adjustable slide (47, 48) for controlling the through the Tap opening (46) escaping secondary air. 3 «refrigerated showcase according to claim 2, characterized by an exterior House 66, which is mounted adjacent to the dispensing opening (46) and an outlet opening (67) adjacent the outer wall of one Part (41) of the rows of frontal air ducts has 909849/0116 ORIGINAL INGPECTED to guide the bleed air along the outer wall of the duct section, in order to reduce condensation there (Pig. 6). 4. Refrigerated showcase according to one of claims 1-3, characterized by a separating device (55, 55a or 61) for division the curtain air flow within the upper curtain air duct (42) in ZweigBtrb'me. 5. Refrigerated showcase according to claim 4 with above the front access opening attached fluorescent tubes and associated ballet units to illuminate the display room, thereby characterized that a two-tetron of the separate curtain • air bypasses the ballast units (53) before seeing moved down to form the air curtain (35a) while a second twofold of the split curtain air flow ■ bypassed the ballet units (53) via a by-pass channel is used to directly form the air curtain, whereby, at least two adjacent, substantially laminar air curtain streams be formed across the front access opening (11) 6ο refrigerated showcase according to claim 4, characterized by a curtain air flow that is separate within a branch Heating device (64) e