DE1501233A1 - Air or gas guidance with directional effect - Google Patents

Description

PATENT ADVERTISER Bssen, May 16, 1966

Dr. Andrejewski ( ₂ 6 308 / Ni / th)

43 Essen, KettwigerStr. 36

(AmHaeptbahnhof ■ Iidik)
Telephone 25802

Patent registration of the company
CLARK EQUIPMENT COMPANY
Buchanan, Michigan / -USA-

Air or gas guidance with directional effect.

The invention relates to an air or gas duct with a straightening effect for air escaping from a duct under pressure or other gaseous media, in particular for the under Pressure off. cooling air exiting an air duct of a freezer.

In grocery stores and self-service shops, refrigerated counters for perishable goods are used to a large extent used, which allow unimpeded access to the refrigerated goods from above. The inside of the box and those in it Goods in storage are cooled by air, which is passed through cooling coils or the like and through corresponding Channels in one wall of the box across the top

Opening to match en channels in the opposite one Wall are passed, so that there is a constant cycle with ongoing cooling of those flowing past the cooling coils Air yields. As it flows over the open top opening of the counter, the cold air sinks as a result of it greater density down into the inside of the box and thereby cools the goods inside and holds them on the desired temperature. When flowing over the box opening, however, the flow of cooling air tends to to spread or spread out, being part of the initial velocity when exiting the one Wall loses and is influenced by the higher temperature of the air surrounding the refrigerated counter. So far expresses this in the fact that the cooling air sinks down into the box, this is not further harmful, since this air sooner or later got back into the circulating air flow. Unfortunately, however, the air flowing in the air stream over the top opening of the box mixes at least partially on their upper layer with the surrounding air. As a result, some of this cooling air goes to the circulating air Air flow is lost and is replaced by the warmer room air. In addition, it tends to be in the upper class the air flowing in the stream as a result of its speed to create eddies when it meets the air in the room, which results in a further extremely strong mixing the warm room air is caused by the circulating cooling air, which increases the temperature of the cooling air again will. The cooling capacity of the actual cooling system must therefore inevitably be dimensioned so high that it can Disadvantages of the two aforementioned factors, i.e. the replacement of lost cooling air with warmer air and the increased Contact between the cooling air and the warmer air

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Room air as a result of the eddy «to fully balance out can. In the case of a refrigerated counter in which these two disadvantageous factors would not come into play, therefore the cooling capacity of the actual cooling system to be significantly lower.

By mixing the cooling air flow with the warmer Room air is also increased the relative humidity of the cooling air flow, so that the cooling coils faster and form more ice crystals, which greatly reduces the effectiveness of these cooling coils. this in turn requires more frequent defrosting with interruption of cooling and then stronger cooling to achieve the desired temperature. This results in another one further reduction in cooling capacity. By turning off the Causes that lead to excessive heating of the cooling air flow lead, and by avoiding the frequent formation of ice, the cooling capacity of the cooling unit can be improved as a result make better use of them.

For this reason, the invention is based on the object of creating an arrangement through which these disadvantages can be remedied, i.e. for example the loss of cooling air when flowing over the upper opening of a refrigerated counter and the temperature rise of the cooling air due to contact and mixing with the room air is largely reduced.

To solve this problem, the invention proposes an air or gas guide with a directional effect for out of a channel Pressurized air or other gaseous media, especially for pressurized air from an air duct To train cooling air that escapes from the freezer in such a way that

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that in the air duct restricting the air flow and thereby with the same pressure over the entire length of the outlet distributing arrangements are provided and at the outlet with a guide grille practically occupying its entire area a large number of the air flow in the desired direction conductive passage channels is used.

The orientation of the air flow reduces its dispersion and the resulting loss of cooling air with excessive Mixing with the room air. In addition, the air flow is released in several layers through the baffle, the top of which preferably moves forward at the lowest speed, causing the contact and mixing with the room air by reducing the vortex effect is reduced in the air flow across the access opening · To achieve the desired uniformity of the cooling air flow over the entire length or width of the box, arrangements are provided according to the invention, to restrict the flow of cooling air before it reaches the grille, so that the amount and the speed of the discharged air is practically the same over the entire length of the outlet. These constricting arrangements can be designed in the most varied of shapes, for example as a constriction in the delivery part of the air duct or as a grille or the like. At the outlet. In many cases it is particularly advantageous to use both types of the air-restricting arrangements. If there is an evenness the delivery pressure over the entire length of the outlet is not absolutely necessary or if the channels do not have a large extent, these can restrict the airflow Orders are omitted. The flow rate the uppermost air layer can be reduced in various ways. According to a proposal of the invention is this

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a deflector is provided which deflects a considerable part of the air through the lower part of the baffle, so that the pressure and consequently the speed of the The air flowing through the upper part of the grille will be lower than the speed of the air flowing through the lower part of the grille escaping air.

Appropriately, this deflector consists of an angle sheet, whose long leg extends in the direction of flow to about half the height of the guide grille and the other one Leg leads transversely to the direction of flow to the inside of the guide grille. Appropriately, for the purpose of being more desirable Division of the air flowing through the upper and lower part of the guide grille through the deflector plate in the air duct e.g. arranged adjustable by exchangeable spacers.

In addition, as already indicated at the outset, the invention is not necessarily limited to refrigerated counters or the like, but rather can also be used for any other construction in which air or another gaseous medium is discharged Lines are released into or through an open space under pressure when it comes to dispersing and mixing of the released medium in and with the atmosphere of this room.

A preferred embodiment of the invention is described in detail below with reference to the accompanying drawings explained; show it:

FIG. 1 shows a cross section through a cooling box open at the top with the air duct according to the invention;

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FIG. 2 shows a detail from the guide grille according to FIG. 1 on an enlarged scale;

FIG. J5 the same part from FIG. 2 seen from the front and

FIG. 4 is a somewhat enlarged perspective view of the air duct with the baffle inserted Scale compared to Figure 1.

The refrigerated counter C shown in Figure 1 is open at the top and closed on the sides by end walls E, of which only one is shown and between which the parallel front and rear walls F, R run, which extend from one raise the corresponding lower part B vertically. As is generally the case, the walls and the lower part consist of the same insulating material. Inside the box, a container W is arranged, the bottom of which is slightly above the Inner wall of the lower part is so that a cooling chamber is created, which is through a between the front and the Rear wall arranged suitable partition P is divided into a front and rear cooling chamber. A fan A, a blower, or other suitable device for creating a flow of air is adjacent to an opening used in this partition wall to circulate the air from the front part of the chamber via air cooling arranged in the rear part of the chamber. devices M such as a cooling coil or another cooling unit to push through. Depending on the length of the Several of these arrangements A and M can be used. The front wall 10 and the rear wall 11 of the Container W are at a certain distance from the front wall F and the rear wall R of the refrigerated counter, so that

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between them vertical channels 12 and 13 result, which are each in communication with the cooling chamber. The box W can be made of any suitable material, for example Sheet metal, which can be easily deformed and have corresponding requirements S for the goods to be cooled can.

The upper edge of the air duct 12 between the front wall 10 of this box and the front wall F of the refrigerated counter is in any way, for example by an approach to the The upper edge of the wall 10, which projects over to the upper edge of the front wall F, is closed. This upper part of the housing wall 10 has slots or openings 14 as passages for the cooling air in the air duct 12. The fan A sucks the air through this slotted or perforated part via the air duct 12 and then presses it over the cooling unit M up through the rear air duct 1} between the rear container wall 11 and the rear wall R the refrigerated counter. The rear container wall 11 jumps horizontally in the upper part into the air duct Ij5, so that a A kind of niche is created in which the guide grille to be inserted is created can be inserted. The vertical wall of this niche is perforated like a grid, for example through horizontal slots 16 or punched in another way.

The upper edge of this grid 15 is fastened via a horizontal connecting web 17 at a suitable point of the refrigerated counter , for example on the back of a type of connection strip T which is fastened in a suitable manner on the part of the rear wall R protruding forward upward. The lower edge of this terminal strip T ends slightly above the upper edge of the grid 15

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has brackets for sun insertion or other fastening of contents for the individual compartments of the refrigerated counter and any free labels. This connecting strip T actually results in a hood protruding forward at the upper edge of the grille, which, however, is not necessarily in the The scope of the invention is required.

Preferably, the grid 15 extends substantially Over the entire length respectively. Width of the refrigerated counter C as well as the air ducts 12 and 15 and is therefore used to the air flow from the duct 13 with practically even « Let pressure escape along the entire length of the grille, so that the air and the grille in practically even amounts flows through with practically the same speed at all 'points. Even if in the example shown If this grid is shown as part of the rear wall 11 of the container W, it can just as easily be used interchangeably in any way.

Instead of this grille 15 or in addition to it, the air flow-restricting arrangements can be used in the rear air duct, which have a slot 18 constricting the duct cross-section or a similar opening or also rows of such openings running in the longitudinal direction. In the illustrated embodiment, these arrangements consist of two angle profiles Jiö ' attached in the longitudinal direction of the container to the inner walls of the channel IJ at the same height, which leave a narrow slot 18 between them. On the other hand, these two angle profiles can of course also be replaced by another arrangement, for example by a U-rail running in the longitudinal direction, which in its base the

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has desired breakthroughs. As a result of the constriction of the air flow in the air duct by this arrangement a dynamic pressure, which BEZW an even distribution of the air over the entire length. Width of the air duct 13 has the consequence, so that the air pressure and the air volume at the points aligned with fan A or the various fans A is no larger than next to these places. In many cases the grid I5 or is sufficient the arrangement 19 * 18 out to the desired uniform To achieve distribution, while in other cases the use of both to achieve the desired result Facilities is required. In some cases where even air distribution is not essential appears necessary, these airflows need constrictions Facilities are also not used, so that a simple opening in the omission of the grid 15 the container wall 11 is provided.

The actual guide grille 20 in the illustrated embodiment consists of two groups at right angles to one another intersecting partition walls 21, so that cells or passages 22 open on both sides with a square cross-section arise. The length of these passages corresponds to the thickness of the guide grille 20, as is particularly clear from FIGS. 1 and 2 you can see. Of course, the arrangement of the passages and their cross-sectional shape can be changed as desired will. This guide grille can consist of any material that appears suitable and, for example, of a synthetic resin, so that a light, inexpensive and attractive guide grille is created. With the one shown Embodiment, this guide grille 20 is attached directly in front of the front surface of the grille 15, so that

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its rear wall rests tightly against the front wall of this grid 15. If, for the reasons already mentioned, there is the grid 15 is omitted, the guide grille. 20 is inserted into the corresponding opening in the rear wall 11. From The air flowing out of the air duct 13 penetrates from behind into each of the passages 22 and leaves the guide grille at the front according to the course of these passages 22. Run in the illustrated Ausführungsbeiepie1 the passages to the front of the refrigerated counter C horizontally. For mounting the guide grille 20 in each Any arrangements can be provided in the desired position, preferably a number of double angle brackets 23 are attached to the front of the wall 11, the vertically upwardly projecting lip * what protrudes beyond the lower edge of the grille 5, so that the guide grille 20 with its lower edge from above between the grid 15 and these lips of the holder 23 inserted whereupon the top edge is pushed backwards, leaving a certain gap between the top connector 17 of the grille 15 and the upper edge of the guide grille 20 remains free. In this connector 17 are a number of resilient locking pins 24 are used, which in corresponding openings, not shown in the Engage the top partition 21 of the guide grille 20 and thereby hold the guide grille in place. For safe use this guide grille 20 can of course also take other precautions.

As already mentioned, the cooling air is discharged through this guide grille 20 in the direction of the passages 22, which here run horizontally and as a result of the directional effect this baffle the air flows in a stream over the

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Long service of the refrigerated counter altogether initial distraction and XeMtreiMfeg <J ·· Stroewt especially upwards. In the direction near the bottom into the container W, the cooling air flows due to its greater specific weight, so that it leaves the direction of flow given to it here. However, this is by no means to be regarded as harmful «but rather desirable because the cooling air gets into the container in this way and thus keeps the goods in the container at the desired cooling temperature, sooner or later being caught in the reflux of the air flow. The air flowing over the access opening of the refrigerated counter penetrates into the front air duct H through the openings 14 and is refluxed by the fan A passed over the KUhlaggregat N and from there over the Air duct 13 printed up. Which are not in the interior of the Air sucked in from the refrigerated counter serves to shield the cooling air and the goods in the container from being heated by the room air located above the upper access opening to the refrigerated counter. In the illustrated embodiment, the inlet to the front or return channel 12 is lower than the oitter 20 located on the rear wall put back into circulation. The air in the container W is drawn up again by the suction effect. If the breakthroughs Ik at the The upper edge of the front air duct would be at the same height as the grille 20 or even higher, the effect would be the same.

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In addition to its directional effect, the guide grille 20 also has a layering effect on the cooling air, which from emerges from this guide grid in several superimposed layers. As below in connection with the extended Embodiment nach'Figur 4 will be explained, the exiting from the guide grille 20 cooling air can be controlled in such a way that the uppermost layer flows out more slowly than one of the lower layers, so that at the contact with the warm air stored above the refrigerated counter results in less turbulence. As a result, arises there is much less mixing between this cooling air and the warm air above it than with fast-flowing air would be the case, so that the warmer room air to a lesser extent into the cooling air flow. is torn. As a result, there will be a rise in temperature of the cooling air flow through contact and mixing with the warm air and an exchange of the cooling air through the warmer air is kept to a minimum. As already mentioned at the beginning, such a reduction The rise in temperature of the cooling air not only requires a lower performance of the cooling unit, but the possibility of ice formation on the cooling unit is also reduced. Such ice formation is natural quite undesirable, since it reduces the effectiveness of the heat exchange, while also the cooling unit must be continuously defrosted, with a warming of the box and its contents occurs. The cooling unit would have to be switched on much more often in order to restore the desired temperature of the goods and to be maintained so that a higher power output would be required.

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The grid construction shown in Figure 4 corresponds essentially to that of Figure 1, but in addition a deflector is inserted in the outlet air duct 13 at the outlet opening. This deflector consists of a Winke1-bleoh 30 »whose horizontal leg 31 in the air duct transversely attached to the direction of flow close behind the grille 15 approximately in the middle of this grille or the guide grille 20 is and its vertical leg 32 protrudes far down and divides the channel 13 into two parts lying one behind the other. This vertical baffle 32 is in some way suitably arranged parallel to the two walls of the air duct 13 and in the illustrated embodiment with screws 33 or similar fastening elements screwed tightly to the rear wall R, with corresponding spacers 34 between this partition and the rear wall R are used. The horizontal leg 31 of the deflector guides the part of the through the front part of the air duct 13 upwardly flowing air through the lower part of the guide grille 20. Through the upper part of the guide grille 20 As a result, only part of the flows through the air duct 13 flowing air, which flows behind the deflector 30 upwards. The distance of the vertical leg 32 from the front or The rear wall of the air duct 13 determines the distribution of the through the upper and lower part of the Guiding grille 20 discharged cooling air, the baffle 30 concentrates a larger proportion of the cooling air through the lower part of the guide grille 20 than would otherwise flow through this part, so that the interior of the box and the goods in it are kept at the desired temperature. Usually this distraction will only be at .The so-called deep freezers, as used for frozen food, ice cream and the like. Goods, which under

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Must be kept freezing temperature, used. However, this is not intended to imply that this is the case Deflector absolutely necessary for all freezers is or that it doesn’t also - with other freezers or » if necessary, used in other circumstances could be.

The fact that a greater proportion of the cooling air is passed through the lower part of the guide grille 20 than would otherwise flow through without the deflector, is naturally the one flowing through the upper grille Air volume reduced. As a result, the pressure and therefore the speed of this is the top Air flowing through the grille is reduced so that the topmost layer of the air flow flowing over the access opening of the refrigerated counter moves more slowly as one of the lower layers. The benefits of this slow-flowing top layer have already been mentioned. the Distribution of the air between the upper and lower parts of the baffle by the deflector J50 and consequently the pressure and speed of the air in the Different layers can naturally be caused by the displacement of the deflector between the front and rear walls of the Air duct 13 can be changed, which is easy to accomplish. When using more than one deflector the same principle can naturally be applied.

As already mentioned, the use of the air or gas routing described above is not exclusively limited on refrigerated counters, but such a guide grille can also be used for the discharge of air or any other

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gaseous medium under pressure from a line can be used to the aforementioned trend-setting and to take advantage of the layering effects of the grid construction.

Expectations:

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Claims (4)

1. Air or gas guidance with directional effect for air escaping from a duct under pressure or other gaseous air Media, in particular for the cooling air exiting under pressure from an air duct of a freezer, characterized in that that in the air duct (13) "restricts the air flow and thereby with the same pressure over the entire Length of the outlet distributing arrangements (15; 18, 19) are provided and at the outlet practically all of it Area-occupying guide grille (20) with a multiplicity of passage channels guiding the air flow in the desired direction (22) is inserted. 2. Air or gas guide with directional effect according to claim 1, characterized in that the constricting the air flow Arrangements of at least one grille (15) in the air outlet on the inside of the guide grille (20) and one more or less narrow slot (18) resulting arrangements (19) exist in the air duct (13). 3 air or gas guidance with directional effect according to claim 1, characterized in that the outlet of the air duct (13) is essentially parallel to the direction of flow of the air and a deflector plate (30) is arranged in the air duct, one part (32) of which in the flow direction up to about to half the height of the guide grille (20) and its other part (31) transversely to the direction of flow towards the guide grille is angled. 4. Air or gas guide with directional effect according to claims 1-3, characterized in that the passage channels (22) in the guide grille (20) run practically parallel to each other and the baffle plate (30) for dividing the in the lower S09843 / 06A4 and the upper part of the guide grille, the amount of air flowing out in the air duct (15), for example by means of spacers (34) adjustable 1st. Patent attorney Dr. W. Andreevsky 909843/0644