DE9413181U1 - Double-deck refrigerated car - Google Patents

Description

DESCRIPTION

The invention relates to insulated truck bodies or swap bodies for trucks, as used for transporting refrigerated freight.

In such refrigerated bodies, cold air is generated during the journey by means of a refrigeration unit and fed into the loading area via a cold air inlet, usually located in the uppermost area of the front end of the body, in order to

to maintain the required low temperature in the cargo hold.

An important value is the so-called throw distance of the refrigeration unit, i.e. the length over which the cold air is ejected in a substantially horizontal flow before

it sinks downwards according to its high specific gravity.

It is generally assumed that for superstructures with a length of more than eight metres, this throw must be improved by installing longitudinal flow channels below the ceiling of the superstructure in order to adequately cool the parts of the load that are further away from the cold air intake.

Such a flow channel can be created, for example, by a textile material stretched at a distance below the ceiling, into which the refrigeration unit blows at least part of the cold air and whereby at least part of the cold air is transported into the area of the cargo area remote from the cold air inlet.

The throw range of the cooling unit is additionally reduced by obstacles in the flow path of the cold air.

Such obstacles include loading beams that are adjustable in height and extend across the loading area, such as those used to create an additional loading level at half the height of the body, if these

In their resting position, the loading beams are located directly below the ceiling of the vehicle body.

It is known to set the rest position at a correspondingly low level in order to leave sufficient space between the upper edge of the loading beams in the rest position and the underside of the ceiling for the cold air flow, for example through supporting cold air ducts as described above.

&iacgr;&ogr; However, this reduces the available free

Loading height when the second loading floor is deactivated.

It is therefore the object of the invention to create a refrigerated structure in which the loading height and the cold air flow are optimized despite the double-deck function.

This object is achieved by the characterizing features of claim 1. Advantageous embodiments result from the subclaims.

The law prescribes heat loss limits for refrigerated bodies, which result in, for example, an average insulation thickness with conventional insulation materials for the side walls and roof of the body.

By making transverse grooves in the insulated roof from the underside to accommodate the loading beams in the rest position, the remaining roof thickness can be reduced to a level below the average insulation thickness if, on the other hand, the insulation thickness in the area between the grooves is greater than this average value.

However, by averaging the insulation thickness of the roof and simultaneously placing the loading beams in the resting position in the area above the underside of the roof, an overall increase in the loading height of 40 - 60 mm is achieved compared to conventional solutions.

· i

These 40 - 60 mm are partly the missing internal height in order to be able to transport two pallets of a given height in a double-deck arrangement, since the possible external height is usually already fully utilized.

The cold air flow can be further optimized if the loading bars in the rest position are not only completely within the grooves that accommodate them, but also if there are only small distances between the sides of the loading bars and the walls of the grooves, and in addition the

The underside of the loading beams should be as level as possible with the underside of the roof in order to create a smooth roof underside with as little interruption as possible.

For this purpose, the undersides of the loading beams can also be slightly designed as a flow profile, so for example - viewed in the direction of flow of the cold air - they initially stand slightly upwards behind the starting edge of the groove, be slightly inclined or curved downwards as they run backwards, and end slightly below the end edge of the groove. It is also possible for the end of the groove to overlap with an overflow edge that is located on the loading beam at the rear edge of the underside.

The installation of flow channels made of flexible, textile material is also possible in this way, as this flow sheet can be pushed together lengthwise and, after all loading beams have been moved to the rest position in the longitudinal direction of the vehicle, can be put into operation, e.g. by means of cables or similar.

An embodiment according to the invention is described in more detail by way of example with reference to the figures. They show

Figure 1: an enlarged detailed view compared to

Figure 2 with the inventive solution and

Figure 2: a side view of a conventional saddle

Trailer for refrigerated cargo with intermediate floors in
cut open state,

Figure 3: a modified version of Figure 1
Depiction,

Figure 2 shows the state-of-the-art solution for refrigerated bodies, in this case a truck semi-trailer - with the option of additional loading floors.

These consist of the loading beams (6) which can be adjusted in height in the vertical direction with their ends in the vertical rails (4) which are attached to the sides of the structure (1) and which lock into the desired position.

According to the depth of the pallets (8) on which the load (2) is located, the rails (4) are arranged in pairs, so that two rails (4) are always directly adjacent to each other, except usually for the last rail at the rear end of the body (1).

In the upper area of the front side of the body (1) the refrigeration unit (17) is arranged in a corresponding recess, which blows essentially horizontal cold air backwards into the loading space (5) via a cold air inlet (11) arranged in the upper area of the front side of the loading space (5) directly under the ceiling.

As shown in the front area of the trailer, especially when pallets (8) with loads (2) are arranged one above the other using the loading beams (6), the only flow path for the cold air is between the underside of the ceiling (13) and the upper edge of the load (2).

However, if in some places - as shown in Figure 2 in the loading segment starting from the front and the following - an additional, approximately central loading floor is not required because the load itself is high enough, for example, the loading beams (6) that are not required remain in their rest position, which is located directly below the ceiling (13).

These loading bars (6) in the resting position therefore represent an obstacle in the flow path for the cold air, which is thus significantly weakened or does not reach the rearmost areas of the loading space (5) at all.

The solution according to the invention shown in Figures 1 and 3 creates an obstacle-free flow channel between the lower edge of the ceiling (13) and the upper edge of the load (2) by removing the unused loads that are in the rest position.

The raised loading beams (6a, 6b, 6c) are located in grooves (10) which are located transversely in the underside of the ceiling (13) and completely accommodate the loading beams (6) that are not required.

For this purpose - since a minimum insulation thickness of the ceiling (13) must also be maintained in the area of the grooves (10) - the thickness of the ceiling (13) is increased and thus in the area between the grooves (10) is increased to such an extent that the statutory limit values are reached as the average insulation value of the ceiling.

With the same external dimensions of the body, this still results in a total height of at least 40 to 60 mm higher for loading than with the conventional solution.

The distance between the upper edge of the load and the underside of the ceiling can be smaller, the more optimized the flow path of the cold air is below the ceiling. For this purpose - as shown in Figure 2 on the loading beam 6a - the undersides (16) of the loading beams (6) can be designed as a flow guide surface by starting at a slightly higher point on the front edge of the loading beam than they end at the rear edge, and in the rest position of the beams (6) the rear lower edge is slightly below the lower edge of the ceiling (13), and the front edge of the underside (16) of the loading beam (6a)

slightly above the lower edge of the ceiling (13). This prevents turbulences from occurring due to the axial distances between the two adjacent loading beams in the resting position, e.g. beams 6b and 6c, as well as due to the distance between the start of the groove (10) and the first loading beam in the loading space and between the two loading beams in it and the end of the groove (10), which greatly reduce the total throw distance of the cold air.

&iacgr;&ogr; For the same reason, the loading bars (6) should also

be guided as precisely and as free of play as possible along the rail (4) in the axial direction, so that the width of the grooves (10) only has to be slightly larger than the corresponding dimensioning of the loading beams (6).

In addition, to improve the flow below the ceiling, flow guide surfaces (18) can be arranged, e.g. in the areas between the grooves (10) and thus the rails (4). In order to improve the flow when loading beams are pushed up into the rest position, but also when loading beams are in use and are in the area of the

Rails existing gap between these

In order to bridge the flow guide surfaces (18), corresponding bridging surfaces (19) can be attached to the flow guide surfaces (18) so that they can be displaced in the longitudinal direction, in order to produce a flow guide surface that also extends over the area of the rails (4), as shown in the right half of Figure 1.

In contrast, Figure 3 shows another solution in which the bridging surfaces (19) are arranged on the underside (16) of the loading bars (6) and can either lie directly on the underside or be pulled downwards at a distance from it.

This has the advantage that when the loading beams are in use at half the loading height, these bridging surfaces (19) can be positioned directly against the underside of the loading beams (6), so that the maximum loading height is available below the loading beam. If the

If the loading bar (6) is not required and is in its resting position in the groove (10), the bridging surface (19) is pulled downwards out of the loading bar and bridges the gap between the individual flow guide surfaces (18).

In order to be able to move the loading beams (6) preferably completely into the grooves (10), the rails (4) must generally also extend upwards into these grooves (10).

Claims (6)

42105 Al/z Double-deck refrigerated wagon REQUIREMENTS 1. Insulated truck body or insulated truck swap body &iacgr;&ogr; for refrigerated freight with -a cold air inlet (11) in the upper area of the front side of the body (1) and -in the interior of the body (1) on the sides (3) there are fastening rails (4, 4') that run essentially vertically and loading beams (6) or loading floors that run essentially horizontally across the loading space (5), the front ends of which are guided along the fastening rails (4, 4') and can form a second loading level that is raised relative to the floor of the body (1), characterized in that -transverse grooves (10) are arranged in the insulated ceiling (13) to accommodate the loading beams (6) and
-the fastening rails (4) extend into the area of the ceiling (13), -that the loading bars (6) are in the rest position in the grooves (10) are located. 2. Structure according to claim 1,
characterized in that the thickness of the insulated ceiling (13) is so great that, despite the reduced thickness of the ceiling (13) in the area of the grooves (10), the minimum requirements for both the minimum thickness of the ceiling (13) and in the area of the grooves (10) are met, and the minimum insulation effect of the insulated ceiling as a whole is met. 3. Structure according to claim 1,
characterized in that the loading bars (6) in the rest position are completely within the grooves (10) and in the rest position there is as little distance as possible between the outer circumference of the loading bars (6) and the lateral inner surfaces of the grooves (10). 4. Structure according to one of the preceding claims,
characterized in that the grooves (10) are wide enough to accommodate two &iacgr;&ogr; loading bars (6) close to each other in them can be. 5. Structure according to one of the preceding claims,
characterized in that the underside of the loading beams (6) is designed as a flow profile for the optimal bridging of the next contact edge of the groove end or the adjacent loading beam (6). 6. Structure according to one of the preceding claims, characterized in that
a bridging surface (19) is arranged on the underside of the loading bar (6), which bridging surface is adjustable between a position adjacent to the underside (16) of the loading bar (6) and a position spaced apart from it in the vertical direction.