WO2020192999A1

WO2020192999A1 - Device for heating a tank

Info

Publication number: WO2020192999A1
Application number: PCT/EP2020/053529
Authority: WO
Inventors: Juergen Hanneke; Jan Ruigrok van de Werve
Original assignee: Robert Bosch Gmbh
Priority date: 2019-03-27
Filing date: 2020-02-12
Publication date: 2020-10-01
Also published as: DE102019204202A1

Abstract

The invention relates to a device for heating a tank (10) in which an operating/auxiliary agent (12) that is capable of freezing is stored. The operating/auxiliary agent is conveyed by a conveying unit (18). The conveying unit sucks in the operating/auxiliary agent (12) that is capable of freezing through a filter (22), upstream of which a heating means (20) is connected. At least in the bottom region (44) of the tank (10), and/or in the housing (30) of the conveying unit (18), and/or in a slosh wall (68), an integrated heat pipe (40, 60, 62) is arranged, which enlarges a heat emission surface (42) and is connected to at least one heat generator (80), to which at least one cooling element (104, 106) is assigned.

Description

Device for heating a tank

Technical area

The invention relates to a device for heating a tank in which a freezable operating / auxiliary material is stored. The invention also relates to the use of the device in a tank for storing an operating / auxiliary material for the aftertreatment of exhaust gas from an internal combustion engine.

State of the art

Tank systems for storing liquids require a suitable tank, a delivery unit and corresponding connecting lines to provide the liquid to the consumer. Due to physical

Properties of a medium, such as a reducing agent, which freezes at temperatures of -11 ° C, tanks that store this medium must be equipped with heaters. These enable the operating / auxiliary material to be in a liquid state even at low ambient temperatures. The heaters used today are usually powered by electricity and transfer their heat to the medium via heat conductors and are referred to as “point heaters” due to their expansion

Due to the permeability of a reducing agent, such as a freezable urea-water solution or other liquids, especially plastic materials, the electrical or electronic components located inside a heater can be damaged or signs of corrosion can set in. Usually the heating effect is the previously used heaters limited to their installation area and their surroundings.

Presentation of the invention

According to the invention a device for heating a tank is provided

proposed, wherein a freezable operating / auxiliary material is stored in the tank, which is conveyed by a conveyor unit which sucks the freezable operating / auxiliary material through a filter, which is preceded by a heater. At least one integrated heat-emitting surface enlarging a heat radiation surface is integrated at least in the bottom area of the tank and / or in the housing of the delivery unit and / or in a slosh wall or in a pot wall

Arranged heat pipe which is connected to at least one heat generator, the at least one integrated heat pipe being assigned at least one cooling element.

With the solution proposed according to the invention, on the one hand, the service life, in particular of flat heat pipes coupled with a heat generator, can be increased considerably, and on the other hand, a considerable increase in the area usable for heat radiation in a tank storing a freezable operating / auxiliary material is achieved.

In the solution proposed according to the invention, the at least one heat generator is designed, for example, as a PTC element or a resistance heater, which is connected via at least one conductor rail to an electrical

Interface is electrically contacted.

Those used in the solution proposed according to the invention

Heat pipes can advantageously be designed as heat pipes in a flat design, which are held pressed between a first cooling element and a second cooling element by a clamping force. By applying the clamping force, intimate contact between the

Heat generator on the one hand and the heat sinks on the other hand.

Another advantageous effect of an axial compression, in particular of flat heat pipes, lies in the fact that a protective covering of the heat generator is compressed in the axial direction by the clamping force, as a result, internal stresses build up on the front sides of the protective covering, which would prevent the introduction of an extremely creeping substance, such as

for example reducing agents, which in turn improve the service life and permeability behavior of the protective covering.

In a further advantageous embodiment of the invention

proposed solution, the heat pipe is accommodated in a flat design by means of an axial pressing device between the cooling elements, wherein the wall thickness of a protective cover can vary in a range between 0.2 mm and 1.5 mm. The wall thickness is varied depending on the location and position, with a thicker wall thickness range of up to 1.5 mm being selected in the end areas of the protective cover that are exposed to direct contact with aggressive media, whereas the wall thickness in the areas that are are not in direct contact with aggressive media, can be made significantly lower.

In the solution proposed according to the invention, the

Axial compression of the heat generator and the cooling elements minimizes the number and size of air chambers between an envelope of the busbars and the cooling elements, so that a contact area of the plastic material to the operating / auxiliary material is significantly reduced.

In the solution proposed according to the invention, the heat pipes, in particular designed in a flat construction, are embedded in slosh walls, in housings or in floor areas and are designed as floor-integrated heat pipes or wall-integrated heat pipes. With these installation variants, the use of the heat pipes in flat construction can result in a considerable

Enlargement of the heat radiation surface can be achieved by almost all components in the tank. Thus, with the solution proposed according to the invention, a considerable increase in the design of the heating of the surface heating is possible in comparison to the point heating used previously.

In the housing, for example a delivery unit, which is received in the tank, a number of

Heat pipes can be arranged in a flat design, so that the housing for example, the delivery unit arranged in the tank serves to enlarge the heat radiation surface.

In an advantageous further development of the solution proposed according to the invention, the housing of the delivery unit is connected to heat conduction channels extending to the bottom area below the filter. As a result, the heat transported through the heat pipe can be transported into the bottom area of the tank in accordance with the expansion of the heat conduction channels, so that a considerably larger area of the tank storing the freezable reducing agent can be heated.

In the solution proposed according to the invention, for example, a wall-integrated heat pipe can be installed in a pot wall of a pot or in a

Slosh wall. These design variants also result in an enlargement of the radiation surface required for heat radiation in comparison to solutions according to the prior art that tend to act punctually.

In the solution proposed according to the invention, a circumferential angle a, within which the wall-integrated heat pipe runs in the slosh wall and / or the pot wall, can be in an angular range between 80 ° and 270 °. Depending on the choice of the circumferential angle a, a corresponding area of the tank storing the freezable medium can be supplied with heat, so that a significantly larger thawing volume results compared to solutions according to the prior art that tend to act at points.

In the solution proposed according to the invention, the number of flat heat pipes arranged in the housing of the delivery unit is coupled to the bottom area of a pot inside the tank in such a way that an additional floor heating surface is created below the filter and the housing. With the solution proposed according to the invention, heat can thus be introduced into the volume of freezable operating / auxiliary material stored directly in the pot of the tank. Since there is already thawed volume underneath the conveying unit via which the freezable operating / auxiliary material is conveyed, a device for post-treating the exhaust gas, the medium that is now in the liquid state of aggregation, ie the freezable Introducing the operating / auxiliary material into the exhaust gas of the internal combustion engine while it is still cold.

In a further development of the solution proposed according to the invention, the at least one heat generator can be used as an individual PTC heater, as a

Resistance heater, as a PTC belt heater or as a PTC liquid heater. This is coupled, for example, to a cylindrical heat pipe, a flat heat pipe, an oscillating heat pipe or an ultra-flat heat pipe.

The invention also relates to the use of the device in a tank for storing an operating / auxiliary material for the aftertreatment of exhaust gas from an internal combustion engine of a passenger car, a utility vehicle or a truck.

Advantages of the invention

The busbars and heat generators used in the device proposed according to the invention for heating a tank can be provided with a plastic extrusion coating and coupled with a heat pipe. The complete encapsulation of plastic material, in which the busbars and the heat generator, for example as a PTC element, is embedded, is preferably connected to two heat sink elements of equal size and weight with regard to their surface. By a

Axial compression of the two cooling elements and the casing in which the busbars and the heat generator are accommodated can reduce air inclusions and improve heat conduction, as can also be achieved by axial compression of the above

Composite, the end faces of the plastic casing have a higher internal stress. As a result, the penetration of the extremely creeping reducing agent is hindered, so that the service life of the composite of at least one heat generator, the plastic casing and the

Busbars is improved.

By coupling the heat generator with a heat pipe, heat can be transferred with a comparatively small temperature difference, whereby in the solution proposed according to the invention there is the possibility of quickly thawing the operating / auxiliary material that may be frozen there even in regions of the tank remote from the heating elements. By pressing the composite of busbars, heat generator,

Plastic casing and cooling elements, air gaps between the heat pipe and the protective coating are avoided, so that there is a significantly improved heat transfer. Another advantageous effect of this solution is the improvement of the cooling of the heat generators, for example designed as PTC elements, and an increased cooling capacity. If a high degree of efficiency is achieved, the PTC element used must be cooled evenly so that it only reaches its specified cut-off point later, from which the thermal output is reduced.

As already indicated above, the solution proposed according to the invention can minimize the permeation area by reducing the contact area between the plastic material and the operating / auxiliary material. This results from the fact that the

at least one cooling element is largely covered. A possible penetration of the reducing agent into the plastic encapsulation can only take place via the end faces, on which, however, there is an increased internal stress in the material, which makes penetration of the reducing agent more difficult.

In the solution proposed according to the invention, cooling elements which are designed simply and inexpensively can be used, for example in panel construction or as a continuously cast profile, since these no longer have to be overmolded and there is therefore no risk of cracking and thus flooding. The solution proposed according to the invention results in a reduced component weight, since the heat pipes are generally designed as hollow bodies. The choice of material for the heat pipes used in their different geometries, depending on the configuration of the tank, depends on the areas of application, for example in the case of a reducing agent such as Ad Blue stainless steel or in the case of a water tank, copper material. Relatively simple connections of additional heat sink geometries can be made to the heat sinks, whereby a further increase in component cooling is possible. In an expansion stage, hydrocarbon nanotubes (CNT) can be incorporated, which allow a heat transfer rate of up to 6000 watts (mk) to be achieved in the final expansion stage. The solution proposed according to the invention also makes it possible to use almost the entire base area of a carrier, in particular arranged in a recess in the tank, as a heat radiation surface by almost completely utilizing the available installation space. In addition, the solution proposed according to the invention allows, for example, the housing wall of a cylindrically designed pump dome to be used as a possible heat radiation surface. If, for example, heat conduction structures extend from heat pipes in a flat design to the bottom area of the tank, then in particular a continuous

Heat is introduced below a filter arranged in the tank and thus accelerated thawing of the entire filter area.

In the floor area, floor-integrated heat pipes in

Ultra-flat design can be installed, so that the entire volume of the freezable reducing agent located above the bottom of the tank could be thawed. In particular, results from the invention

proposed solution the possibility of thawing the entire tank volume in all vehicle inclines. The solution proposed according to the invention can significantly increase the efficiency of the

Heating elements such as PTC individual heaters, PTC band heaters or PTC liquid heaters or resistance heaters can be achieved. This can be done through the improved cooling, whereby an effective heat dissipation can be realized. Furthermore, by distributing the heat within a slosh wall or in a pot wall of a pot inside the tank and by means of concealed heat pipes, a further enlargement of the heat radiation surfaces can be achieved so that a larger volume of the freezable reducing agent stored in the tank can be thawed. According to the respective tank geometry, any desired geometries of heat pipes can be coupled with the heat generators used, so that the available installation spaces can always be taken into account. The solution proposed according to the invention can achieve a significant reduction in the heating in the area of the heating surfaces; For example, a surface that is up to six times larger can be heated to a temperature three times higher in just half the time. At

Conventional heaters reach a temperature of 30 ° C after approx. 30 seconds, with heaters equipped with heat pipes a temperature of 90 ° C is reached after approx. 15 seconds; thus are also shortened in the future to achieve legal system availability times without any problems. Larger quantities of the operating / auxiliary substance can be made available for metering in much faster, with approx. 200 g / h - 250 g / h being made available today, but 500 g / h being expected in the future.

Point heaters used so far weigh, for example, 250 g, while with the solution proposed according to the invention, the weight can be reduced by up to 60% with the same heating power, which in turn has a positive influence on the CC ^ balance of one with the one according to the invention

proposed solution equipped vehicle with it. In the solutions used so far, clamping elements or pressings are in

Radiators are used to attach and / or position the heating elements (PTC), which can lead to breaks in the heating element over the service life. The solution proposed according to the invention results in a specifically adjustable pressing or screwing, clamping or riveting, so that failure, for example through breakage, can be excluded. It is ensured that the generation of the heating power remains essentially constant over the service life.

Brief description of the drawings

Embodiments of the invention are explained in more detail with reference to the drawings and the following description.

Show it:

Figure 1 shows the representation of a tank, arranged in a recess

Heating, an underlying filter and a conveyor unit,

Figure 2 is a plan view of the arrangement according to Figure 1,

Figure 3 shows a section through a tank according to the invention

Suggestion,

FIG. 4 shows a plan view of the configuration of the device for heating a tank according to FIG. 3, FIG. 5 shows a sectional illustration of a further embodiment variant of the device proposed according to the invention for heating a tank,

Figure 6 is a plan view of the arrangement according to Figure 5,

FIG. 7 shows a section through a heat pipe arranged, for example, in a slosh wall or a pot wall with a heat generator in between,

Figures 8.1 and 8.2 design variants of an electrical interface,

FIG. 9 shows the representation of an axially compressed composite

Cooling elements, busbars, heat generators and

Plastic protection 11 u ng,

Figure 10 is a schematic representation of an oscillating heat pipe and

FIG. 11 shows a representation of heat conduction channels in the tank bottom

FIG. 1 shows a tank 10 in which a freezable operating / auxiliary material 12, which is, for example, a reducing agent in the form of a urea-water solution, is stored. A level within the tank 10 is identified by reference numeral 14. In the area of the tank bottom 16, within a recess 24 provided there, there is a

Delivery unit 18. Furthermore, there is a filter 22 in recess 24

let in. A heater 20 is located above the filter

The delivery unit 18 is with its housing 30 on a carrier 26

recorded. The housing of the delivery unit 18 is denoted by reference numeral 30. A possible thawing area that results from the arrangement shown in FIG. 1 within the tank 10 is indicated by reference numeral 28 and is - as can be seen from FIG. 1 - essentially limited to the area above the recess 24 in the tank 10.

FIG. 2 shows a plan view of the arrangement according to FIG. 1. It can be seen from FIG. 2 that the feed unit 18 is received on the recess 24 shown here in the top view. Next to this is the crescent-shaped filter 22, above which the external heater 20 is arranged. In a dashed arrangement - analogously to the illustration according to FIG. 1 - denotes a possible structural area which is located according to FIG

Arrangement, which is shown in Figure 1, results. With reference to FIGS. 1 and 2, it should be noted that a possible thawing area 28 is located essentially above the recess 24 of the tank 10 for receiving the freezable operating / auxiliary material 12.

Design variants

Figure 3 shows a first variant embodiment of the invention

proposed solution, a supply of freezable operating / auxiliary material 12 being stored in the tank 10. Also in the embodiment variant of the solution proposed according to the invention shown in FIG. 3, the recess 24 is located in the area of the tank bottom 16 of the tank 10, which is formed by a lowered support. The housing 30 of the delivery unit 18 is received on this. From the illustration according to FIG. 3 it can be seen that the carrier 26 has a double bottom because there is

Floor area 44 a heat conduction channel 38 extends. This is connected to a similar one that runs in the housing 30 of the conveyor unit 18. The tank 10 is closed by the tank lid 58. A number of heat pipes 40 in a flat or ultra-flat design are accommodated in the housing 30 of the delivery unit 18. These are, for example, let into the housing wall of the housing 30 in a 90 ° distribution in relation to one another, preferably injected (see position 46). The extrusion coating 46 ensures that the heat pipes 40 have a flat construction or

Ultra-flat design against the extremely creeping reducing agent, which is stored in the tank 10, are protected. By arranging the at least one heat pipe 40 in a flat design or in an ultra-flat design in the jacket of the housing 30 of the delivery unit 18, it is achieved that the surface of the housing 30 of the delivery unit 18 also represents a radiation surface 42. Furthermore, the housing 30 is configured in such a way that at least one heat conduction channel 38 extends into the base area 44 of the double base extends within the carrier 26. This makes it possible to thaw frozen reducing agent immediately below the filter 22. In comparison to the rather punctiform heat input according to the solution according to FIGS. 1 and 2, the embodiment variant according to the invention in FIG. 3 can achieve a considerable increase in the radiating surface 42 of the heat.

FIG. 4 shows a plan view of the embodiment variant of the device proposed according to the invention for heating the tank 10, shown in FIG. 3. In the illustration according to FIG. 4, they are in

Housing 30 arranged in a 120 ° division, for example (see. Distribution 52), heat pipes 40 in flat design or ultra-flat design. This turns the housing 30 of the delivery unit 18 into an additional radiation surface 42. As can also be seen from the top view according to FIG. 4, an additional floor heating surface 50 is created, which lies within the pot 54, which is delimited by a pot wall 56. It can also be seen from FIG. 4 that the external heater 20 lies above the filter 22, below which, as shown in FIG. 3, the floor area 44 runs within the carrier 26. The variant of the device proposed according to the invention according to FIGS. 3 and 4 creates an additional floor heating surface 50 which extends over the floor of the entire pot 54 within the pot wall 56.

Instead of the 120 ° division shown in FIG. 4 as a distribution 52 arranged heat pipes 40 in flat design or ultra-flat design, two or four heat pipes 40 in flat design or ultra-flat design can also be used

one above the other or lying next to one another on the housing 30 of the

Be included delivery unit 18 and in this way enlarge the radiating surface 42 of the housing 30, so that a flat

Heat input into the medium stored in the tank 10 according to FIG. 3

in particular a freezable operating / auxiliary material 12 takes place.

Figure 5 shows another embodiment of the invention

proposed solution in which in the area of the pot 54 a

Slosh wall 68 is located. The slosh wall 68 can also be attached to the Heat conduction channel 38 may be connected, which in the variant embodiment according to FIG. 5 extends below the tank bottom 16. The slosh wall 68 itself can comprise a wall-integrated heat pipe 62, as can the pot wall 56 of the pot 54, which is received in the interior of the tank 10. A wall-integrated heat pipe 62 can also run in the pot wall 56. The pot 54, which is bounded by the circumferential pot wall 56, is closed on its underside by the carrier 26 in which the conveyor unit 18 is located. Analogous to the illustration according to FIG. 3, a filter 22 is received in the pot 54, above which a heater 20 is arranged. From the illustration according to FIG. 5 it can be seen that in this embodiment variant of the solution proposed according to the invention, a floor-integrated heat pipe 60 is not arranged in the carrier 26, but in the floor 16 of the tank 10. In the embodiment according to FIG. 5, not only is an additional floor heating surface 50 achieved, but rather the pot wall 56 is added, which is provided with a

wall integrated heat pipe 62 can be provided, as well as the

Sloshing wall 68 as well as the bottom 16 of the tank 10, which is designed with a double bottom. This allows a significantly larger volume of the operating / auxiliary material 12 stored in the tank 10 to be transferred from the frozen state to the liquid state.

The illustration according to FIG. 6 shows a plan view of the arrangement shown in FIG. The plan view according to FIG. 6 shows that both floor-integrated heat pipes 60 in tubular form 66 and floor-integrated heat pipes 60 in flat form 64 run in the tank bottom 16 of tank 10. The slosh wall 68 shown here in the top view is supported by a wall-integrated heat pipe 62 (cf. dashed illustration)

streaked. The same applies to a peripheral region of the pot wall 56 which delimits the pot 54 which is let into the tank 10. A wall-integrated heat pipe 62 also extends in the pot wall 56 of the pot 54. Starting from the axis of symmetry of the pot 54, a circumferential angle region 70 is shown. In the illustration according to FIG. 6, the angle a is approximately 150 °, which denotes an area within which the operating / auxiliary material 12 stored in the tank 10 is heated via the heat pipes 60, 62 shown. The circumferential angle range 70 (cf. angle a) can extend from 90 ° to 270 °, which in each case depends on the structural space conditions and the geometry of the tank 10. For the sake of completeness, it should be mentioned that the pot 54 is delimited by the pot wall 56. Inside the pot wall 56 is the Conveying unit 18, designed for example according to the one in FIG

The illustrated embodiment variant with a number of heat pipes 40 embedded in the housing 30 in a flat design or in an ultra-flat design. The filter 22, above which the external heater 20 is arranged, is located in the bottom surface of the pot 54.

FIG. 7 schematically shows a wall-integrated heat pipe 62 which, for example, can be let into the pot wall 56 of the pot 54 as well as the slosh wall 68 (see illustration according to FIG. 6) located in front of it in the tank 10. FIG. 7 shows that the wall-integrated heat pipe 62 shown here includes a heat generator 80 in the center. In which

Heat generator 80 can be, for example, an individual PTC element, a resistance heater, a PTC strip element or a PTC liquid heater. The heat generator 80 is made up of one

Plastic material 112 manufactured protective cover 82 surrounded. An electrical interface 84 representing two busbars 86 is located in the protective covering 82.

Furthermore, FIG. 7 shows that the heat generator 80 or its protective casing 82 are each connected to a first heat pipe part 90 and a second heat pipe part 92. The two heat pipe parts 90, 92 extend in the form of branches in the direction of a first cooling element 104 and a second cooling element 106, which are only indicated schematically in the illustration according to FIG. A common feature of both heat pipe parts 90 and 92 is that heat is transferred from the heat generator 80 to a respective evaporation area 100 which is located in the lower part of the first heat pipe part 90 or the second heat pipe part 92. From the evaporation regions 100, vapor channels 94 extend into the heat pipe parts 90 and 92, respectively

Condensation area 98 of the two heat pipe parts 90 and 92.Cooled by the first cooling element 104 and the second cooling element 106, the heat is released in the condensation area 98, so that the circulating medium by means of a capillary liquid return 102 through condensate channels 96 back into the evaporation area 100 at the lower end the heat pipe parts 90 and 92 respectively. FIGS. 8.1 and 8.2 show design variants of an electrical interface 84. In the electrical interface 84, busbars 86 are provided, which are surrounded by a protective covering 82. This is usually injection molded from plastic material 112, so that busbars 86 are cast into it. As can be seen from FIG. 8.1, the busbars 86 can extend in the longitudinal or circumferential direction 116 and the respective heat generators 80, for example individual PTEC elements, can extend electrically

to contact. This is shown in Figure 8.1. It can be seen from FIG. 8.2 that the busbars 86 open into the electrical interface 84 and are surrounded by a protective coating 110. The protective encapsulation 110 essentially corresponds to the protective covering 82. A wall thickness of the protective encapsulation 110 made of plastic material 112 is denoted by reference numeral 114. The wall thickness 114 of the protective encapsulation 110 is in the illustration according to FIG. 8.2 in the range between 0.2 mm and 1.5 mm.

The variant of the electrical interface 84 shown in FIG. 8.2 can be used, for example, in the wall-integrated heat pipe 62 shown in FIG. 7 with the first heat pipe part 90 and the second heat pipe part 92.

FIG. 9 shows a composite of cooling elements 104, 106, protective cover 82 and heat generator 80, which is pressed in the axial direction.

The illustration according to FIG. 9 shows that a first cooling element 104 and a second cooling element 106 are pressed together by means of clamping components 120 by generating a clamping force 122 by an axial clamping device shown in more detail. The axial force required to generate the

Clamping force 122 leads, can by screws, bolts or other

Connection techniques or pulse welding are generated. Through the

Axial bracing of the cooling elements 104, 106 in relation to the protective covering 82 of the heat generator 80 results in intimate contact between those involved

Components as well as a compression of the materials in the axial direction, so that existing air chambers and air pockets are reduced and the materials claw into one another. On the one hand, this design achieves a very good heat transfer 88, on the other hand, the

Compression can be achieved in the axial direction that the protective cover 82, which is made of plastic material 112, in the area in which it is with the Operating / auxiliary material 12 comes into contact, has a relatively high internal stress. This relatively high internal stress on the end faces exposed to the operating / auxiliary material 12 hinders the penetration of the extremely creeping operating / auxiliary material 12 and impairs the permeability. This considerably increases the service life of the assembly shown in FIG. The illustration according to FIG. 9 also shows that in this embodiment variant of the heat pipe 40 in a flat design or

Ultra-flat design media channels of the heat pipe 40 can be designed in a round design 124 or in a square design 126. The channels running in the first cooling element 104 can be formed either in a first cross section 130 or also in a smaller, second cross section 132 and are used for the schematic illustration of the

Heat dissipation from the first cooling element 104. The clamping force 122 is generated, for example, by screws, springs or also by magnets or other suitable methods as well as magnetic pulse welding.

The two cooling elements 104, 106, which are shown in FIG. 9, serve as axial clamping devices, between which the at least one heat generator 80 is embedded.

An oscillating heat pipe 128 is shown schematically in the illustration in FIG. This comprises a closed channel 134 in which a heat transport medium 136 circulates. The circulation takes place in such a way that there are gaps 138 between individual quantities of the heat transport medium 136. Oscillating heat pipes 128 make it possible that areas below a heating source level can also be heated. The heat is distributed evenly and quickly and over the entire surface of the oscillating heat pipe 128. Thus, depending on requirements and installation space, the size of the oscillating heat pipe 128 can be adapted or selected in order to achieve optimal heating of a respectively desired area. The desired temperatures can be set depending on the heat source by means of adapted filling media that are present in the oscillating heat pipe 128.

FIG. 11 shows a representation of heat conduction channels 140 in the tank bottom Corresponding to the top view of the pot 54, which is delimited by the pot wall 56, shown in connection with FIG. 4, a floor-integrated heat pipe 60 is received in the carrier 26 below the filter 22 and is connected to at least one heat conduction channel 140. From the

Sectional view, which is shown in Figure 11, shows that the carrier

26 has a double floor, the space for the floor-integrated

Heat pipe 60 and at least one connected to it

Heat conduction channel 140 offers. In connection with FIG. 3, it should be pointed out that the heat pipes 40 have a flat design

Heat conduction channels 38 have, which run into the carrier 26, which is also embodied twice here, or into the bottom region 44 defined by the double embodiment of the carrier 26.

The invention is not restricted to the exemplary embodiments described here and the aspects emphasized therein. Rather, within the range specified by the claims, a large number of modifications are possible that are within the scope of expert knowledge.

Claims

Expectations

1. Device for heating a tank (10) in which a freezable operating / auxiliary material (12) is stored, which is conveyed by a conveying unit (18), which the freezable operating / auxiliary material (12) through a filter (22 ), which is preceded by a heater (20), characterized in that at least in the bottom area (44) of the tank (10) and / or in the housing (30) of the delivery unit (18) and / or in a slosh wall (68) at least an

Integrated heat pipe (40) enlarging the heat radiation surface (42)

60, 62), which is connected to at least one heat generator (80) to which at least one cooling element (104, 106) is assigned.

2. Device according to claim 1, characterized in that the at least one heat generator (80) is a PTC element or a resistance heater, which is electrically contacted via at least one busbar (86) of an electrical interface (84).

3. Device according to claim 1, characterized in that a

Heat pipe (40) is pressed in flat design between a first cooling element (104) and a second cooling element (106) by a clamping force (122).

4. The device according to claim 3, characterized in that the heat pipe (40) in a flat design by means of an axial clamping device between the cooling elements (104, 106) and pressed into a

Protective covering (82) is embedded, the wall thickness of which varies in a range between 0.2 mm and 1.5 mm.

5. The device according to claim 1, characterized in that the axial compression of the heat generator (80) and cooling elements (104, 106) minimized air chambers between a protective covering (82) of the busbar (86) and the cooling elements (104, 106) remain and a contact area of the plastic material (112) and the operating / auxiliary material (12) is considerably reduced.

6. The device according to claim 1, characterized in that the

Flat design heat pipes (40) are coupled to a slosh wall (68), a housing (30) or floor areas (44) and are designed as floor-integrated heat pipes (60) or wall-integrated heat pipes (62).

7. The device according to claim 1, characterized in that im

Housing (30) of the delivery unit (18) in a recess (52) along the circumference a number of heat pipes (40) in

Flat design is arranged.

8. The device according to claim 7, characterized in that the housing (30) of the delivery unit (18) has heat conduction channels (38, 140) extending to the bottom region (44) below the filter (22).

9. The device according to claim 1, characterized in that a

wall integrated heat pipe (62) is embedded in a pot wall (56) of a pot (54) or a slosh wall (68).

10. The device according to claim 9, characterized in that a

Circumferential angle a, within which the wall-integrated heat pipe (62) runs in the slosh wall (68) and / or the pot wall (56), lies in an angular range between 80 ° and 270 °.

11. The device according to claim 7, characterized in that the number of flat heat pipes (40) arranged in the housing (30) of the delivery unit (18) is coupled to the bottom area (44) of the pot (54) in such a way that an additional floor heating surface (50) below the filter (22) and the housing (30) arises.

12. The device according to claim 1, characterized in that a

first heat pipe part (90) and a second heat pipe part (92) are connected to the heat generator (80) and extend in an arc shape to a first cooling element (104) and to a second cooling element (106).

13. The device according to claim 1, characterized in that the at least one heat generator (80) is a PTC individual heater, a resistance heater, a PTC tape or a PTC liquid heater, which is equipped with a cylindrical heat pipe, a flat heat pipe (40) , an oscillating heat pipe (128) or an ultra-flat

Heat pipe is coupled.

14. Use of the device according to one of the preceding claims in a tank (10) for storing an operating / auxiliary material (12) for the aftertreatment of exhaust gas from an internal combustion engine of a car, a commercial vehicle or a truck.