DE102018101104B4 - Movable transport unit with coolable interior and loading area for the transport unit - Google Patents

Abstract

Movable transport unit (1) with a flat cooling element having a coolable interior, the transport unit (1) having at least one interior ceiling (4 ') which closes off the interior at the top, and - a head plate arranged above it and spaced from the interior ceiling (4'). (4), wherein at least one essentially horizontally extending hollow shaft (7) is formed between the interior ceiling (4') and the head wall of the head plate (4) and the shaft is formed on at least both transverse sides between the interior ceiling (4') and the head plate (4). each has an opening (23, 24) and the openings are opposite one another, with at least two heating/cooling elements (6) being arranged in the interior ceiling (4') and the heating/cooling elements (6) discharging cold downwards into the interior of the Serving trolley (1) and heat upwards into the shaft and from the shaft via the at least one opening to the outside, with at least the interior ceiling (4 '), the head plate (4), the heating / cooling elements (6) and the hollow Shaft (7) forms the flat cooling element, the hollow shaft (7) has a first heat-conducting plate (21) and a second heat-conducting plate (20), the heating/cooling elements (6) with the first heat-conducting plate (21) and further each with at least a heat-conducting body (19) which extends from the heating/cooling elements (6) into the hollow shaft up to the second heat-conducting plate (20), the heat-conducting body (19) covering the respective heating/cooling element (6) and the second heat-conducting plate (20) is thermally coupled, the first heat-conducting plate (21) at least partially covering the interior ceiling (4') towards the hollow shaft (7) and the second heat-conducting plate (20) covering the surface of the head wall towards the hollow shaft (7). is arranged.

Description

The present invention relates to a movable transport unit, wherein the transport unit is movably mounted on rollers and the coolable interior is surrounded by walls, one wall of which is an interior ceiling, which is provided with cooling elements and cools the interior of the transport unit, and is further spaced apart There is a head plate on the interior ceiling, so that the head plate and interior ceiling form a hollow shaft which is open on at least one side, in particular one of the two vertical transverse sides of the transport unit, and the waste heat produced by the cooling units is dissipated via the shaft. In particular, the movable transport unit is used as a serving trolley that can be moved using muscle power for storing and transporting food to be cooled, e.g. as a galley trolley in an airplane. The invention furthermore relates to a loading area with slots into which the transport unit(s) can be inserted.

State of the art

On board long-haul commercial aircraft or in trains, the food to be cooled, such as ready meals, snacks, drinks - both alcoholic and non-alcoholic, are stored in serving trolleys, so-called galley trolleys. Depending on the size of the stock, a large number of such serving trolleys are required. The serving trolleys usually consist of an approximately cuboid-shaped cabinet that is arranged on wheels and can be opened from at least one side or from two opposite sides. In the interior of the cabinet, running strips are provided along opposite side walls, on which pull-out drawers rest, in which the catering products to be sold are stored. These trolleys are usually filled with catering products outside the aircraft by catering companies. For many catering products it is important that they are cooled, for example to ensure their shelf life. Several solutions have already been proposed for cooling.

To provide cooling, it is common for dry ice (solid CO ₂ ) to be placed in a drawer, usually approximately in the middle of the trolley. Dry ice produces a significant cooling effect when it sublimates. The disadvantage of dry ice is that when it evaporates, CO ₂ is released into the aircraft, which is undesirable for numerous reasons. Another disadvantage is that the cooling effect stops as soon as all the dry ice has sublimated. In addition, setting a desired temperature is difficult.

In another method of cooling the goods in trolleys that do not have their own cooling system, the trolleys on the aircraft are connected to a cooling circuit in which cooled air circulates. The cooling air is supplied by a refrigeration machine. In known solutions, the refrigeration machine is integrated into the galley or placed on it. This is, among other things, in the publication US 2013 / 0 047 657 A1 described. Integrating the refrigeration machine into the galley entails a loss of storage space and additional weight. Arranging the refrigeration machine above the galley requires complex fastening. Another disadvantage of this solution is the noise. In another known solution, the refrigeration machine is arranged below the galley in the cargo hold. This solution, although favorable from an acoustic point of view, is associated with other disadvantages: long, complicated and high-loss pipelines are required.

Another option for cooling the goods inside the serving trolley is shown in publications DE 43 08 144 C1 . This discloses a service trolley for use in an aircraft, which has a horizontal, drawer-like partition which is intended as a cooling and heating unit and divides the interior of the service trolley into an upper and a lower section, between which no air exchange takes place. The partition is equipped with Peltier elements. In order to keep the air moving in a heated section of the service car above the partition and the air in the cooled section of the service car below the partition, fans are provided in each case. A disadvantage of the service car after the DE 43 08 144 C1 is that with a cooler temperature in the lower section, a higher temperature in the upper section is necessarily associated. This also counteracts the efficiency of the cooling units, as this increases with good heat removal.

The use of Peltier elements as heating and/or cooling elements is known per se. A Peltier element is an electrothermal converter that, based on the so-called Peltier effect, generates a temperature difference when current flows through and vice versa creates a current flow when there is a temperature difference. Peltier elements can be used both for cooling and - when the current direction is reversed - for heating. A common abbreviation for Peltier elements and Peltier coolers is TEC (thermoelectric cooler). In general, a Peltier element consists of a number of semiconductor blocks, called p/n junctions, between two ceramic plates are attached. The ceramic plates serve as electrical insulators. When an electric current flows through the semiconductor blocks in one direction, heat is also transported from one side to the other side of the semiconductor blocks. To improve heat exchange, heat exchangers are usually mounted on the side of the ceramic plates facing away from the semiconductor blocks. Refrigerated containers that have Peltier elements are known in a wide variety of designs. Examples for this are: DE 60 2004 010 886 T2 , JP H08-14 724 A , US 3,823,567 A , US 2015 / 0 059 363 A1 , US 2015 / 0 201 803 A1 and JP H04-2 302 A .

Task of the invention

It is the object of the present invention to provide a movable transport unit with a coolable interior, in particular as a serving trolley for cooling food, and possibly also for warming up chilled goods in commercial aircraft or trains, which is easy to handle and has reduced weight compared to previously known serving trolleys is. Furthermore, it should be possible to specifically set food or drinks to a desired temperature in a temperature-controlled environment until they are served to the passengers. In addition, the transport unit should be able to be arranged in a space-saving manner and should not require any complex peripherals for its operation.

Summary of the invention

The task is solved by the subject matter of the independent patent claims. Advantageous embodiments of the invention are described in the subclaims or below.

The transport unit includes a base plate, an interior ceiling, a head plate and four side walls. The base plate, interior ceiling and the four side walls delimit the interior from the outside. On the transverse side (this is usually the narrow side) these are two transverse walls and on the long side these are two longitudinal walls. At least one transverse wall has a door. The interior ceiling and top plate form a flat cooling element, with a hollow shaft being spanned between the interior ceiling and head plate, each of which has an opening on opposite transverse sides of the flat cooling element.

The essence of the present invention is that there is a head plate above the interior ceiling of the interior and thus a substantially horizontal hollow shaft spans between the interior ceiling and the head plate, which is open on both vertical transverse sides of the transport unit and through which the waste heat from the warm side of the heating/ Cooling element is dissipated. The cooling side of the heating/cooling element faces the interior in cooling mode.

The temperature difference between the hot side and the cool side of the heating/cooling element is preferably greater than 20°C, in particular greater than 25°C. The temperature of the interior can preferably be set between 4°C and 8°C.

In plan view, the floor plan of the transport unit preferably forms an elongated rectangle with long sides that are at least a factor of 1.5 longer than the transverse sides. According to this embodiment, the transport unit comprises a base plate, an interior ceiling and a head plate arranged above the interior ceiling, which are essentially congruent with respect to the outer circumference. On the long sides of the base plate, the interior ceiling and the head plate, longitudinal walls are arranged at right angles, which connect the long sides of the base plate, the interior ceiling and the head plate.

Likewise, transverse walls are arranged at right angles on the transverse sides of the base plate and the interior ceiling, which connect the transverse sides of the base plate and the interior ceiling. At least one of the transverse walls is designed as a door or has an at least closable opening that allows access to the interior of the transport unit. It is preferred that the transport unit has a door.

The interior ceiling and head plate form a flat cooling element, with a hollow shaft being spanned between the interior ceiling and head plate, which has an opening on at least one transverse or longitudinal side of the flat cooling element. The shaft is preferably open on both transverse sides of the flat cooling element.

In one embodiment, the interior ceiling has pins on the long sides, which engage in recesses provided for this purpose in the respective transverse wall. This gives the transport unit additional stability.

The top of the head plate can be used as a work surface. According to one embodiment, the head plate is enclosed between the longitudinal walls and the longitudinal walls protrude slightly beyond the head plate.

In one embodiment, there is an electrical component in the form of a control unit at the top of one of the transverse sides, with which the temperature of the cooling units can be controlled. Preferred the electrical component in the form of a control unit is located at least partially on the transverse side of the head plate, the head plate possibly having a recess for the electrical component. Furthermore, the electrical component in the form of a control unit is connected via power lines to the heating/cooling units located in the flat cooling element. In one embodiment, the electrical component in the form of a control unit is selected so that it rests on the interior ceiling.

The electrical component is preferably located on the transverse side of the flat cooling element, in particular the head plate, and preferably on the front side. In a further embodiment, there is an electrical plug connector on the transverse side of the flat cooling element, in particular the head plate, opposite the electrical component in the form of a control unit, via which the transport unit, for example in an airplane, can couple to a possible mating connector via an external power source.

Rollers are arranged on the base plate. The transport unit preferably has 4 rollers.

According to one embodiment, the transport unit has running strips inside, on which any floors designed as trays or any pull-out storage boxes designed as drawers serve as a guide. The shelves or drawers are accessible from the side.

For interior walls made of a thermoplastic material, the running strips can be produced by forming, for example by deep drawing. The longitudinal walls with the running strips can also be produced by injection molding or blow molding.

The transport unit may be manufactured using sheets of metal (including alloys or composite materials comprising metals). Suitable metals include magnesium, aluminum and their alloys, such as Aludur, Aluman, duralumin, hydronalium and silumin. Organic sheets are also suitable. These consist of a fiber fabric or a fiber fabric that is embedded in a thermoplastic matrix. The advantages of a thermoplastic matrix lie in its hot formability. Commonly used fiber materials that are integrated into the plastic matrix are glass, aramid, metal and carbon fibers. The thermoplastic matrix can be made, for example, of polyamide, preferably PA 6, PA 6.6, PA 6.9, PA 6.12, PA 11, PA 12, PA 06/04, PA 12/12. Polypropylene is also possible.

Side walls with a honeycomb structure (so-called honeycomb) are also suitable. These are usually designed as a sandwich panel with a honeycomb core (abbreviated as honeycomb panel) and contain an at least three-layer composite construction in a sandwich construction, which consists of two cover skins and a honeycomb-shaped support core. The support core is also considered tight. Honeycomb is called honeycomb. The support cores and cover skins are made, for example, of plastic, fiber composite materials or sheet metal. Various material combinations between the support core and cover skins are possible; Support core and skins are usually glued together.

The running strips, e.g. made of aluminum, can be placed on the side walls with a honeycomb structure. This can be done by riveting and/or gluing. According to another embodiment, the outer cover skin is flat and the other cover skin is profiled. A compressible foamed plastic is arranged between the cover skins. The inner covering skin can be produced by deep drawing a plastic film. The running strips are then formed directly by the inner wall of the longitudinal wall.

The heating/cooling elements are arranged in the flat cooling element, in particular in the interior ceiling. For this purpose, the interior ceiling can have openings or recesses that reduce the thickness of the interior ceiling, for example down to the cover layer of a honeycomb structure.

The hot side and cold side each refer to normal operation, for which the interior or at least one chamber is cooled. Of course, it is also possible to reverse this by operating the heating/cooling elements inversely. During normal operation, the cold side of the heating/cooling elements is directed towards the interior of the transport unit, which forms the storage space. The warm side is aligned towards the headstock.

In a preferred embodiment, the heating/cooling element is inserted into a recess in the interior ceiling. The interior ceiling can, for example, be made of a honeycomb structure (so-called honeycomb).

According to a particularly preferred embodiment, the heating/cooling elements on the warm side are connected to at least one heat-conducting plate, with the at least one heat-conducting plate then lining wall surfaces of the interior ceiling and/or the top plate towards the hollow shaft, so that heat is transferred via the hollow shaft is dissipated by allowing air to pass over the heat-conducting plate or plates. Additionally can The heat conducting bodies must be placed on the wall surfaces or directly on the heating/cooling elements.

In a further preferred embodiment, there is a heat-conducting plate on the wall surface of the interior ceiling and the wall surface of the head plate towards the shaft, via which the cold or heat produced by the heating/cooling element is dissipated. In this embodiment, the upper sheet is a so-called second heat-conducting sheet and the lower sheet is a so-called first heat-conducting sheet.

The first heat-conducting plate rests at least partially on the heating/cooling element(s) and means the plate which rests on the interior ceiling towards the hollow shaft. The second heat conducting plate is attached to the underside of the head plate and also faces the hollow shaft.

The second heat-conducting plate is in contact with at least one heat-conducting body. The at least one heat-conducting body consists of a thermally conductive material such as light metal and in particular aluminum and preferably has several fins. The heat-conducting body connects the first and second heat-conducting plates and serves to dissipate heat from the heating/cooling elements. The heat is first transferred to the first heat-conducting plate, then or simultaneously to the heat-conducting body and then to the second heat-conducting plate.

Preferably 2 to 8 heating/cooling elements are provided in the flat cooling element, particularly preferably 3 to 6 heating/cooling elements. The arrangement of the heating/cooling elements on or in the interior ceiling can, for example, be directly one behind the other at a distance from one another.

In a further preferred embodiment, there is a cooling plate on the underside of the interior ceiling below at least one heating/cooling element, which serves to better distribute the cold resulting from the cold side of the heating/cooling elements within the interior of the serving trolley. The cooling plate is preferably made of a material that has high thermal conductivity. This is preferably a light metal, particularly preferably aluminum. More preferably, the cooling plate is located under all heating/cooling elements located in the interior ceiling and particularly preferably the cooling plate extends over at least 50% of the area of the interior ceiling.

In a preferred embodiment, the interior ceiling and the head plate are spaced apart from one another in a parallel offset and span a hollow shaft with a height of, for example, 5 to 20 mm, preferably 8 to 15 mm, which is open on at least one transverse side, preferably to the transverse side that is preferred designed as a door. The hollow shaft is particularly preferably open on both transverse sides. The waste heat produced by the heating/cooling elements located in the interior ceiling can escape via the hollow shaft.

The heating/cooling elements used are preferably Peltier elements. These are so-called thermoelectric modules, i.e. electric heat pumps that can transport heat against a temperature gradient using the Peltier effect. They are generally used for cooling below ambient temperature, for temperature stabilization and for realizing temperature changes and cycles. Unlike compressor cooling systems, thermoelectric modules are very compact. They work without moving parts, without environmentally harmful refrigerants and are completely vibration and noise-free. They are usually DC components and can therefore be regulated across the entire power range. Peltier elements are therefore ideal as heating and cooling units for integration into the movable transport unit. A Peltier element consists of two or more small cuboids, each made of p- and n-doped semiconductor material. Two different cuboids are always connected to one another in such a way that they form a series connection. The supplied electrical current flows through all the cuboids one after the other. Depending on the current strength and direction, the upper connection points cool down while the lower ones heat up. The current thus pumps heat from one side to the other, creating a temperature difference between the plate sides.

Common forms of Peltier elements consist of two usually square plates made of aluminum oxide ceramic with an edge length of 20 mm to 90 mm and a distance of 3 mm to 5 mm, between which the semiconductor cuboids are soldered. For this purpose, the ceramic surfaces are provided with solderable metal surfaces on their facing surfaces. If you cool the warm side e.g. B. by means of an attached heat sink with a fan, the cool side becomes colder. Depending on the Peltier element and current, the temperature difference between the two sides can be up to approx. 70 Kelvin for single-stage elements.

The Peltier elements are supplied with power within the storage areas of the galley. The Peltier elements are preferably connected to an electrical connector via a power cable. The connector is preferably located in the transverse side of the head plate, ie in the opposite side containing the electrical component ing transverse side. The connector is preferably mounted flexibly, ie not rigidly. However, other positions for the connector are also conceivable. The connector can be connected to a connection element in the aircraft in the form of a mating connector in order to initiate cooling or heating of the Peltier elements. The advantage of this arrangement compared to the prior art is that it is possible to dispense with the usual refrigeration machines, which are located elsewhere in the aircraft to ensure the cooling of the food and drinks. In a preferred embodiment, the electrical component for regulating the temperature is located on the transverse side forming the door in the head plate of the transport unit, which then, according to one embodiment, rests on the interior ceiling.

The plug can be moved forwards and backwards in a housing. The housing is guided by pins in a socket.

The transport unit can be a serving trolley, for example in the form of the usual standard serving trolley designs, such as those known for aircraft under the names ACE, ATLAS or KSSU.

• 1 eine perspektivische Ansicht eines Servierwagens mit geöffneter Tür und einem zwischen Kopfplatte und Innenraumdecke befindlichen hohlen Schacht;
• 2 eine seitliche Ansicht eines Servierwagens mit geöffneter Tür und entfernter vorderer Längswand;
• 3 eine Ansicht auf die vordere Querseite des flächigen Kühlelements mit der Steuereinheit;
• 4 eine Ansicht auf die hintere Querseite des flächigen Kühlelements mit dem Steckverbinder;
• 5 eine Ansicht eines Schnittes durch das flächige Kühlelement mit Kopfplatte und Innenraumdecke und vier in die Innenraumdecke eingelassenen Heiz-/Kühlelementen;
• 6 eine Vergrößerung eines in eine Innenraumdecke eingelassenen Heiz-/Kühlelementes mit darüber befindlichem Wärmeleitkörper im Längsschnitt;
• 7 eine Vergrößerung eines in eine Innenraumdecke eingelassenen Heiz-/Kühlelementes mit darüber befindlichem Wärmeleitkörper im Querschnitt; und
• 8 und 9 die erfindungsgemäße Transporteinheit eingeschoben in eine Galley.

The invention is illustrated with reference to the drawings without being limited to them. In the drawings, the transport unit is shown as a serving trolley. Show it:

• 1 a perspective view of a serving trolley with the door open and a hollow shaft located between the head plate and the interior ceiling;
• 2 a side view of a serving trolley with the door open and the front longitudinal wall removed;
• 3 a view of the front transverse side of the flat cooling element with the control unit;
• 4 a view of the rear transverse side of the flat cooling element with the plug connector;
• 5 a view of a section through the flat cooling element with head plate and interior ceiling and four heating/cooling elements embedded in the interior ceiling;
• 6 an enlargement of a heating/cooling element embedded in an interior ceiling with a heat-conducting body above it in a longitudinal section;
• 7 an enlargement of a heating/cooling element embedded in an interior ceiling with a heat-conducting body above it in cross section; and
• 8th and 9 the transport unit according to the invention is inserted into a galley.

1 and 2 show a cuboid serving trolley 1 that can be moved by means of rollers 10, the head plate 4 and base plate 5 of which each form an elongated rectangle of approximately the same area. One of the two transverse sides of the serving trolley 1 is formed by a flap in the form of a door 3, with in 1 the door 3 is visible when open. Below the foot plate 5 there are four rollers 10, between which a parking brake 14 is attached. Inside the serving trolley 1, parallel running strips 9 are attached to the side walls 2, 2' (only for side wall 2' in 1 shown) into which transport boxes can be inserted.

Between the head plate 4 and the interior ceiling 4 'there is a hollow shaft 7, which is open to the front, i.e. towards the door. Head plate 4, interior ceiling 4 'and foot plate 5 are bordered on the long sides by the longitudinal walls 2 and 2', which protrude upwards beyond the head plate 4.

The head plate 4 forms the top of the serving trolley 1. In the transverse side of the head plate, towards the door, there is an electrical component 18 approximately in the middle as in 3 (A in 1 ) and a connector 9 is attached to the rear on the transverse side, as in 4 shown.

2 shows the serving trolley 1 with a missing long side wall 2 with an inserted transport box. This will be pulled into or out of the serving trolley 1 along the running strips 9. Door 3 is visible when open.

3 and 4 show a view of the hollow shaft 7 formed from the interior ceiling 4 'and head plate 4 from the transverse side, with a control unit 18 centrally located inside the head plate 4 on the front transverse side, ie the transverse side which forms the door (not shown). located recess is inserted ( 3 ). Heating/cooling elements located in the interior ceiling can be controlled via the control unit 18 in order to adjust the temperature inside the serving trolley. Between the interior ceiling 4 'and the head plate 4 there is a front gap 23 through which the heat produced by the heating/cooling elements can escape.

On the opposite rear transverse side ( 4 ) there is an electrical connector 8, via which the transport unit is supplied with electrical current via a mating connector 11 and/or control signals can be supplied. The plug connector is inserted into a recess located within the head plate 4 and is located approximately in the middle between the interior ceiling 4 'and the head plate 4 on the rear transverse side. Between the head plate 4 and the interior ceiling 4 ', a rear gap 24 is provided on the transverse side between the interior ceiling 4' and the head plate 4, which dissipates heat from the hollow shaft 7.

5 shows a section AA through the interior ceiling 4 'and head plate 4 with four heating/cooling elements 6 embedded therein. In the head plate 4 there is a control unit 18 on the side facing the door 3 between the head plate 4 and the interior ceiling 4' and on the opposite transverse side There is an electrical connector between the head plate 4 and the interior ceiling 4 '. The heating/cooling elements 6 are connected to one another via electrical lines 22. Detail X is in 6 shown and section BB in 7 .

6 shows an enlarged view of a heating/cooling element 6, which is attached within the interior ceiling 4 'between two sheets 20 and 21. The upper plate 20 forms the second heat-conducting plate and the lower plate 21 forms the so-called first heat-conducting plate. The first heat-conducting plate 21 faces the interior of the transport unit 1. Above the first heat-conducting plate 21 there is a heat-conducting body 19, which is attached directly in the recess in the interior ceiling 4 'above the heating/cooling element 6, and rests on the second heat-conducting plate 20 at the upper end. On the underside of the interior ceiling 4 'there is a cooling plate 25, which better distributes the cold generated by the heating/cooling element 6 on its cold side within the interior of the serving trolley 1. For this purpose, the cooling plate 25 is thermally coupled to the cold side of the heating/cooling element 6.

The heat sink has vertical ribs and serves to better dissipate the waste heat produced by the heating/cooling element 6. The individual heating/cooling elements 6 are each connected to one another via electrical lines 22 and are supplied with electrical energy via the electrical plug connector 8 (not shown). The temperature can then be adjusted using the control unit 18 (not shown). 7 shows the same arrangement as 6 for another heating/cooling element 6, but along cutting line BB 5 .

8th and 9 show a single serving trolley 1 in a standard loading area 15, as installed, for example, in aircraft (galley trolley). It is intended that the serving trolleys are arranged next to each other in slots 16 in the lower area. In 9 In addition, a mating connector 11 for the electrical connector 8 can be seen, via which the heating/cooling elements 6 located in the interior ceiling 4 'are supplied electrically when the serving trolley 1 is inserted into the second slot 16 and mating connector 11 and connector 8 couple.

Reference symbol list

1

Serving trolley (movable and temperature-controlled transport unit)

2, 2'

Long walls on the long side

3, 3'

Door (lockable opening) on the transverse side

4

Head plate (second plate)

4'

Interior ceiling (first panel)

5

Footplate

6

Heating/cooling element

7

hollow shaft

8th

Connectors

9

Running bar

10

Role standard

11

Mating connector

12

Storage box

13

Running groove in the storage box

14, 14'

Parking brake pedal standard

15

Loading area

16

Inset

17

Back wall

18

Temperature controller

19

Heat conducting body

20

(first) heat conducting plate

21

(second) heat conducting plate

22

Electrical line

23

Gap in front transverse side

24

Gap in rear transverse side

25

Cooling plate

Claims (9)

Movable transport unit (1) with a flat cooling element having - a coolable interior, the transport unit (1) having at least one interior ceiling (4 ') which closes off the interior at the top, and - supported by the interior ceiling (4') above arranged a head plate (4), at least one essentially horizontally extending hollow shaft (7) being formed between the interior ceiling (4 ') and the head wall of the head plate (4), and the shaft on at least both transverse sides between the interior ceiling (4') and the head plate (4) each has an opening (23, 24) and the openings are opposite one another, with at least two heating/cooling elements (6) being arranged in the interior ceiling (4') and the heating/cooling elements (6) discharging cold downwards the interior of the serving trolley (1) and release heat upwards into the shaft and from the shaft to the outside via the at least one opening, with at least the interior ceiling (4 '), the head plate (4), the heating/cooling elements (6) and the hollow shaft (7) forms the flat cooling element, the hollow shaft (7) has a first heat-conducting plate (21) and a second heat-conducting plate (20), the heating/cooling elements (6) with the first heat-conducting plate (21) and further are each provided with at least one heat-conducting body (19), which extends from the heating/cooling elements (6) into the hollow shaft up to the second heat-conducting plate (20), the heat-conducting body (19) being the respective heating/cooling element ( 6) and the second heat-conducting plate (20) is thermally coupled, the first heat-conducting plate (21) at least partially covering the interior ceiling (4 ') towards the hollow shaft (7) and the second heat-conducting plate (20) lying flat on the head wall towards the hollow shaft ( 7) is arranged. transport unit Claim 1 , wherein at least one of the transverse walls of the transport unit (1) is designed as a door (3). Transport unit according to one of the preceding claims, wherein an electrical control unit (18) for regulating the temperature of the heating/cooling elements (6) is attached to one of the transverse sides of the flat cooling element. transport unit Claim 3 , whereby there is an electrical plug connector (8) on the side of the flat cooling element opposite the electrical control unit (18). Transport unit according to one of the preceding claims, wherein the heating/cooling elements (6) are Peltier elements. Transport unit according to one of the preceding claims, wherein the heating/cooling elements (6) are arranged in recesses or openings in the interior ceiling (4'). Transport unit according to at least one of the preceding claims, wherein one or more cooling plates (25) are located on the interior ceiling (4 ') or on the first plate on the side facing away from the shaft and thermally coupled to the cold side of the heating/cooling elements (6). are located, preferably under/on all heating/cooling elements (6) and particularly preferably the cooling plate (25) extends over at least 50% of the area of the interior ceiling (4 ') or the first plate. Use of the transport unit according to one of the Claims 1 until 7 for storing food on an airplane, especially as a serving cart. Galley of an aircraft into one or more transport units Claims 1 until 7 are inserted as serving trolleys into slots (16) of the galley (15).

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