Tank installation unit and storage tank comprising a tank installation unit

Abstract

Tank installation unit (1) for insertion into a storage tank (2), in particular for operating fluids of motor vehicles, comprising • a basic filter element (3), • a basic module (4) for receiving the basic filter element (3), and • a holding device (7) with an additional filter element (8, 9), • wherein the basic filter element (3) extends along a filter surface (5) of the surface (6) of the basic module (4), • wherein the additional filter element (8, 9) is held by the holding device (7) such that the basic filter element (3) is arranged between the basic module (4) and the additional filter element (8, 9), and • wherein a base area (15) of the additional filter element (8, 9) is larger than the filter area (5) of the base module (4).

Description

State of the art

[0001] The present invention relates to a tank installation unit. Furthermore, the invention relates to a storage tank comprising such a tank installation unit. The storage tank can be used, in particular, to store fuels or other operating materials required for the operation of a motor vehicle.

[0002] Tank installation units are known from the prior art. Tank installation units are generally used to monitor operating fluids using sensors and to pump them out of the storage tank using pumps. A base filter element is provided for filtering the operating fluids. The tank installation unit has a base surface on which the base filter element is mounted. It is generally desirable to produce tank installation units with the smallest possible volume. In this case, the base surface available for the base filter element is reduced. At the same time, the requirements for the quality of the filtered operating fluid are increasing, making high-quality filtration necessary.

[0003] Tank installation units are typically welded directly to the tank. This welding process limits the external dimensions of the tank installation units. Therefore, it is not possible to increase the filter surface area by enlarging the tank installation unit.

[0004] A tank assembly unit is known from DE 10 2013 224 734 A1. New description page 2

[0005] A filter unit for liquids is known from WO 2012 / 153 202 A1. Disclosure of the invention

[0006] The tank installation unit according to the invention enables an increase in the active filter surface without increasing the size of the tank installation unit itself. Thus, the filtration capacity is increased, which is achieved in particular by means of coordinated filter levels.

[0007] For this purpose, the tank installation unit comprises a base filter element, a base module, and a holding device. The base module serves to accommodate the base filter element. The holding device comprises an additional filter element. The additional filter element is held by the holding device in such a way that the base filter element is arranged between the base module and the additional filter element. The base filter element is preferably arranged on the surface of the base module. Furthermore, the base filter element is arranged on the base module in such a way that the base filter element extends along a filter surface of the surface of the base module. The filter surface is thus a partial area of ​​the entire surface of the base module. The filter surface can preferably comprise openings for removing contents from the storage tank.If a fluid is to be drawn from the storage tank, it must first pass through the base filter element before exiting the storage tank through the aforementioned opening in the filter surface. This means that the base filter element is arranged directly adjacent to the surface of the base module, with the surface advantageously having openings in the area of ​​the filter surface. Furthermore, the base area of ​​the additional filter element is intended to be larger than the filter surface of the base module.

[0008] The additional filter element thus attaches an additional filter element to the tank installation unit. The additional filter element is positioned at an additional level relative to the base filter element. This increases the filter surface area, while the filter surface area is no longer solely dependent on the surface area of ​​the base module.

[0009] The flow through the tank assembly is preferably such that the untreated fluid (e.g., urea solution, diesel, gasoline, or other operating fluids) first flows through the additional filter element and then through the base filter element. In this way, the clean side lies behind the base filter element, viewed along the flow direction.

[0010] The base module serves as a support element. In particular, it is intended that the base module supports the holding device. Furthermore, the base module supports the base filter element. The base module can also be connected to the storage tank, particularly by a material bond, and particularly preferably by welding. Thus, the base module has a plurality of components for monitoring the contents of the storage tank using sensors and for removing the contents from the storage tank.

[0011] The base filter element preferably comprises a frame on which at least one filter-active medium is arranged. In particular, the filter-active medium is a depth filter. The pore size of the depth filter is preferably between 70 micrometers and 30 micrometers, particularly preferably 50 micrometers.

[0012] In a depth filter, particles are transported into the filter-active medium by fluid movement, where they are deposited. Deposition can occur, for example, through diffusion, sedimentation, or interception. The particles then adhere to the filter-active medium, particularly through van der Waals forces or electrostatics. In contrast, in a surface filter, a filter cake of filtered-out particles forms on a surface. This filter cake itself also serves as a filter-active layer. With a depth filter, the formation of a filter cake is avoided.

[0013] The subclaims show preferred developments of the invention.

[0014] The tank installation unit preferably has a heating device. The heating device is arranged in particular between the base filter element and the additional filter element. The heating device makes it possible to heat the contents of the storage tank, whereby the contents closest to the base filter element in particular must be heated. The risk of the contents of the storage tank freezing is greatest in the area of ​​the base filter element. Thus, there is a risk of the base filter element becoming blocked due to freezing. This is prevented by the heating device.

[0015] It is particularly advantageous for the heating device to be arranged closer to the base filter element than to the additional filter element. This means that the thawing time is not negatively influenced. In particular, there is a risk of the base filter element freezing, whereas the risk of the additional filter element freezing is lower. The heating device is therefore primarily designed to thaw the base filter element. However, the installation position can also advantageously mean that fluid in the vicinity of the additional filter element can be thawed. For example, the additional filter element can be arranged above the base filter element with respect to the direction of gravity. If the fluid (e.g. diesel or urea solution) in the vicinity of the base filter element is thawed or liquefied (e.g. from a gelled state) by the heating device, the warmed fluid can rise and, in turn, cause thawing or liquefaction.Cause liquefaction of fluid in the area surrounding the additional filter element. Thawing the base filter element can be relevant, for example, for the function of an internal combustion engine connected to the tank assembly, in order to ensure rapid operational readiness.

[0016] The distance between the heating device and the base filter element is preferably between one millimeter and eight millimeters. In particular, the distance is between three millimeters and six millimeters. The distance between the heating device and the additional filter element is particularly advantageously at least five millimeters, in particular at least ten millimeters. In this way, the described thawing of the base filter element can be advantageously achieved. Due to the greater distance to the additional filter element, the presence of the additional filter element does not negatively influence the thawing time. This results in similar or identical thawing times to those achieved with conventional tank installation modules.

[0017] The base filter element preferably comprises a hydrophilic or oleophilic filter material. The hydrophilic or oleophilic filter material thus represents a filter-active medium of the base filter element. The fact that the filter material is hydrophilic or oleophilic results in a reservoir effect of the base filter element. The base filter element thus stores the contents of the storage module, whereby the base filter element is always sufficiently saturated with the contents of the storage tank. This is particularly advantageous when using aqueous solutions as the fluid, e.g. urea solution. This prevents unwanted aeration of the base filter element. Depending on whether the storage tank contains an aqueous solution, such as urea, or an oily component, such as diesel, the filter material can be either hydrophilic or oleophilic.

[0018] The additional filter element comprises, in particular, a first additional filter element and at least one second additional filter element. It is understood that a plurality of additional filter elements can also be provided. The first additional filter element and the at least one second additional filter element are, in particular, separate filter elements. Separate elements means that both the first additional filter element and the second additional filter element are independent elements that are attached to the holding device independently of one another. The first and the at least one second additional filter element are preferably arranged at a distance from one another. They are preferably not in mechanical contact with one another over their entire surface. It is understood that each individual additional filter element can preferably be arranged at a distance from its respective adjacent additional filter element.The second additional filter element is arranged between the first additional filter element and the base filter element. This allows, in particular, a cascade filter to be implemented, with the cascade filter including the base filter element in addition to the two additional filter elements. This increases the filtering performance of the tank installation unit. In particular, the contents of the storage tank can be removed from the storage tank in a very clean state.

[0019] A distance between the first additional filter element and the second additional filter element is preferably between 1 centimeter and 5 centimeters. In particular, said distance is between 2 centimeters and 4 centimeters.

[0020] This advantageously prevents the individual additional filter elements from interfering with each other, e.g., through mechanical contact. The fluid between the additional filter elements can initially settle after passing through one additional filter element before being directed or flowing through the next additional filter element.

[0021] At least the first additional filter element preferably comprises a hydrophobic or oleophobic filter material. In this way, especially in conjunction with the previously described hydrophilic or oleophilic design of the filter material of the base filter element, the starting behavior and / or ventilation behavior of the base filter element is not impaired. Starting behavior is understood to mean the behavior of the fluid generated by the design of the base filter element during the period during which, starting from a rest position in which no fluid flows through the base filter, the fluid flow is increased until a desired fluid flow is reached.

[0022] Likewise, the previously described reservoir effect of the base filter can be fully utilized in this way. The second additional filter element can optionally comprise a hydrophobic or oleophobic filter material and / or a hydrophilic or oleophilic filter material.

[0023] A pore size of the filter material of the first additional filter element is in particular larger than a pore size of a filter material of the second additional filter element. Furthermore, it is preferably provided that a pore size of a filter material of the second additional filter element is larger than a pore size of a filter material of the base filter element. In particular, it is provided that a pore size of the first additional filter element is between 150 micrometers and 250 micrometers, preferably 200 micrometers. A pore size of the second additional filter element is preferably between 50 micrometers and 150 micrometers, in particular 100 micrometers. Finally, a pore size of the base filter element is preferably between 25 micrometers and 75 micrometers, in particular 50 micrometers. In this way, a cascade within the filtration is ensured. Thus, the entire cascade can absorb more particles than the base filter element alone.Due to the design of the tank installation unit, in particular due to the fact that the base area of ​​the additional filter element is larger than the filter surface, the filter performance of the additional filter element, in particular the first additional filter element and the second additional filter element combined, is greater than that of the base filter element. Thus, the base filter element, which is preferably designed as a depth filter, continues to be, as in the prior art, the component of the tank installation unit that determines particle saturation and thus the service life, so that the service life of the tank installation unit is not impaired by the additional filter element.

[0024] The base filter element preferably has a first filter layer and a second filter layer arranged parallel to the first filter layer. The term parallel does not mean strict geometric parallelism, but angular deviations of up to 15 degrees are also possible. The first and second filter layers can, for example, be spaced apart from one another. They are then not in surface contact with one another. Such a distance can, for example, be at least 500 µm or, for example, at least 1 mm. For example, the distance can be 1 mm to 3 mm. In terms of flow technology, the first filter layer and the second filter layer are therefore connected in series. The base filter element has a common frame to which the first filter layer and the second filter layer are attached. This ensures safe and reliable filtration.In particular, both the first filter layer and the second filter layer represent a depth filter.

[0025] The surface area of ​​the filter surface is in particular a maximum of 90 percent, preferably a maximum of 70 percent, particularly preferably a maximum of 60 percent, of the surface area of ​​the base area of ​​the additional filter element. It is thus evident that the geometric extent of the base filter element is smaller than the geometric extent of the additional filter element. Regardless of whether the additional filter element is a single additional filter element or has a first additional filter element and at least one second additional filter element, it is ensured that the additional filter element can absorb more particles than the base filter element. Thus, the service life of the tank installation unit is determined by the base filter element and is not limited by the additional filter element.

[0026] The holding device preferably guides fluid from the additional filter element to the base filter element. The holding device can, for example, be a pot or be designed as a pot, wherein this pot is delimited on the one hand by the additional filter element and on the other hand by the base filter element. This ensures that a cascade effect occurs during filtration, since the contents of the storage tank must first pass through the additional filter element and then the base filter element in order to reach the storage tank. Furthermore, it is preferably provided that the holding device has an additional opening. Fluid can be guided to the base filter element via the additional opening, bypassing the additional filter element. The additional opening therefore represents an emergency running feature. If the additional filter element becomes coated with particles orIf the filter element is clogged with particles to the point where sufficient fluid can no longer pass through, fluid can still flow through the additional opening and thus reach the base filter element. The position and dimensions of the additional opening are preferably selected such that, during normal operation, only low flow velocities and flow volumes are present through the additional opening. Thus, during normal operation, no significant number of particles reach the base filter element. The additional opening therefore represents a purely emergency operation feature.

[0027] A pump is also advantageously arranged on the base module. The pump is covered by a pump dome. The retaining device is attached to the pump dome. In particular, the retaining device is formed integrally with the pump dome. Alternatively, the retaining device is connected to the pump dome by a positive fit, a material fit, and / or a friction fit. Particularly advantageously, the retaining device is glued or welded to the pump dome.

[0028] The base module also includes a fill level sensor. Alternatively or additionally, the base module includes a quality sensor. Both the fill level sensor and the quality sensor are mounted on the base module, particularly outside the retaining device. It is therefore clear that both the fill level sensor and the quality sensor can be arranged on the base module, thus integrating additional sensors into the tank installation unit. At the same time, the filter performance of the tank installation unit is increased by incorporating the retaining device and the additional filter element.

[0029] Finally, the invention relates to a storage tank. The storage tank comprises a tank assembly as described above. Operating fluids for operating a motor vehicle can be stored in the storage tank. Fuels and / or additives, such as urea solutions in particular, for operating a combustion engine of the motor vehicle can be particularly advantageously accommodated in the storage tank. The tank assembly ensures high-quality filtration of the contents of the storage tank when the contents are removed. Short description of the drawings

[0030] Embodiments of the invention are described in detail below with reference to the accompanying drawings. In the drawings: Fig. 1 a schematic illustration of a storage tank according to an embodiment of the invention, Fig. 2 a first schematic illustration of a tank installation unit according to an embodiment of the invention, Fig. 3 a second schematic illustration of the tank installation unit according to the embodiment of the invention, Fig. 4 a third schematic illustration of the tank installation unit according to the embodiment of the invention, Fig. 5 a fourth schematic illustration of the tank installation unit according to the embodiment of the invention, and Fig. 6 a schematic illustration of a base filter element of the tank installation unit according to the embodiment of the invention. Embodiments of the invention

[0031] Fig. Figure 1 shows a storage tank 2 comprising a tank installation unit 1 according to an embodiment of the invention. The storage tank 2 can be filled via a filler neck 21, while the storage tank 2 can be emptied via a discharge nozzle 22. The discharge nozzle 22 is connected to the tank installation unit 1. Thus, filtered fluid can be removed from the storage tank 2.

[0032] Fig. 2 shows schematically the tank installation unit 1 from Fig. 1 in a side view. Fig. 3 shows the tank installation unit 1 along the Fig. 2. The tank installation unit 1 is designed for insertion into the storage tank 2. For this purpose, the tank installation unit 1 comprises a base module 4, which serves as a support for all other components of the tank installation unit 1. The base module 4 has a welding edge 19, to which the tank installation unit 1 can be welded to the body of the storage tank 2. To simplify the welding process, the base module 4 is designed with a round cross-section.

[0033] A base filter element 3 is mounted on the base module 4. The base filter element 3 preferably covers an opening within the base module 4 into which the extraction nozzle 22 opens. Thus, a fluid can be filtered before it is extracted from the storage tank 2 via the extraction nozzle 22.

[0034] In addition, the tank installation unit 1 has a pump, which is covered by a pump dome 14. The pump dome 14 is screwed to the base module 4 via mounting screws 20. For reasons of clarity, the pump dome 14 is Fig. 3 not shown cut.

[0035] To increase the filtering capacity of the tank installation unit 1, the tank installation unit 1 additionally has a first additional filter element 8 and at least one second additional filter element 9. The first additional filter element 8 and the second additional filter element 9 are attached to a holding device 7. The holding device 7 is connected to the pump dome 14 by an assembly aid 23. In particular, the assembly aid 23 is an adhesive. The holding device 7 is made, in particular, from a flexible or elastic material. This makes it possible to use simple connection techniques to achieve a pressure-resistant design.

[0036] The first additional filter element 8 is preferably formed from a hydrophobic filter material. The second additional filter element 9 is optionally formed from a hydrophobic or a hydrophilic filter material. The first additional filter element 8 and the second additional filter element 9 are independent filter elements, which are held in particular individually and independently of one another on the holding device 7. The filter material of the first additional filter element 8 is preferably a surface filter. The filter material of the second additional filter element 9 is preferably a depth filter or a surface filter. It is provided that a pore size of the filter material of the first additional filter element 8 is approximately 200 micrometers, while a pore size of the filter material of the second additional filter element 9 is approximately 100 micrometers.The first additional filter element 8 and the second additional filter element 9 preferably have a distance between 1 centimeter and 5 centimeters, in particular between 2 centimeters and 4 centimeters.

[0037] If fluid is to be withdrawn from the storage tank 2, it must first flow through the first additional filter element 8, then the second additional filter element 9, and finally the base filter element 3. This creates a cascade filtration system that ensures comprehensive filtration of the fluid. At the same time, the dimensions of the base module 4 and thus of the base filter element 3 can be reduced. The reduced filter performance due to the smaller base filter element 3 can at least be compensated for by the first additional filter element 8 and the second additional filter element 9.

[0038] The base filter element 3 preferably comprises a hydrophilic filter material. Thus, there is a risk that the base element 3 will freeze at low outside temperatures. For this reason, a heating device 10 is provided. The heating device 10 serves to thaw the base filter element 3. The heating device 10 is preferably arranged between the base filter element 3 and the second additional filter element 9. In this case, a distance of the heating device 10 to the base element 3 is smaller than a distance of the heating device 10 to the second additional filter element 9. In particular, a distance between the heating device 10 and the base filter element 3 is between one millimeter and 8 millimeters, preferably between 3 millimeters and 6 millimeters. At the same time, a distance between the heating device 10 and the second additional filter element 9 is at least 5 millimeters, preferably at least 10 millimeters.This ensures that the second additional filter element 9 and the first additional filter element 8 do not influence the thawing time of the base element 3, since no thermal conditions are affected. Thus, the tank installation unit 1 has the same thermal characteristics as tank installation units known from the prior art.

[0039] The previously described use of hydrophobic filter material for the first additional filter element 8, and in particular also for the second additional filter element 9, does not affect the reservoir effect and the venting capability of the base filter element 3. Due to the installation position, the warmed or liquefied fluid can rise upwards and then cause the thawing or liquefaction of the fluid in the vicinity of the first additional filter element 8 and / or second additional filter element 9. The tank installation unit 1 thus has a larger active filter surface compared to known tank installation units, while at the same time the thermal characteristics of the tank installation unit 1 are at least as good as those of conventional tank units.

[0040] The tank installation unit 1 also has an emergency running feature. For this purpose, the holding device 7 comprises an additional opening 13. The additional opening 13 serves to transport fluid to the base filter element 3, bypassing the first additional filter element 8 and the second additional filter element 9. It is provided that the flow velocity in the region of the additional opening 13 is low, so that no significant number of particles can reach the base filter element 3 during normal operation. However, should the first additional filter element 8 and / or the second additional filter element 9 be loaded with particles to such an extent that the flow of fluid through them is restricted, the emergency running feature is activated by fluid passing through the additional opening 13 to the base filter element 3.From the base filter 3, the fluid reaches the extraction nozzle 22 and can thus be removed from the storage tank 2 even if the first additional filter element 8 and / or the second additional filter element 9 are clogged.

[0041] Fig. 4 shows the tank installation unit 1 along the Fig. 2 indicated section BB. For reasons of clarity, the pump dome 14 is not shown in section.

[0042] A filter surface 5 is defined on the base module 4. The filter surface 5 is a part of the surface 6 of the base module 4 and represents that part of the surface 6 of the base module 4 on which the base filter element 3 is arranged. Particularly advantageously, the filter surface 5 corresponds to an opening in the base module 4, with the opening opening into the extraction nozzle 22.

[0043] As is particularly evident from Fig. 4, the area or size of the filter surface 5 is limited by additional components of the tank installation unit 1. For example, a fill level sensor 16 and a quality sensor 17 can also be attached to the surface 6 of the base module 4. Furthermore, the pump covered by the pump dome 14 is arranged on the surface 6 of the base module 4. Since a reduction in the filter performance of the tank installation unit 1 resulting from the reduction in the filter surface 5 can be counteracted by the first additional filter element 8 and the second additional filter element 9, the tank installation unit 1 advantageously allows the integration of additional components, in particular sensors, for example sensors as described above.

[0044] Fig. 5 shows the tank installation unit 1 along the Fig. 2 indicated section CC. Again, for reasons of clarity, the pump dome 14 is not shown in section.

[0045] Out of Fig. 5 shows the base area 15 over which the second additional filter element 9 extends. Likewise, the first additional filter element 8 extends over the base area 15. It is obvious that the base area 15 is larger than the filter area 5 of the base module 4.

[0046] Due to the size ratios between the base area 15 of the first additional filter element 8 and the second additional filter element 9 and the filter surface 5 of the base filter element 3, it is particularly ensured that the filter capacity of the first additional filter element 8 and the second additional filter element 9 is greater than that of the base filter element 3. In a preferred embodiment in which all filter elements are depth filters, the first additional filter element 8 and the second additional filter element 9 can thus absorb more particles than the base filter element 3. Even when designed as a surface filter, a higher filter capacity is provided for the first additional filter element 8 and the second additional filter element 9 due to the base area 15 being larger than the filter surface 5. The base filter element 3 therefore represents a component that determines the service life of the tank installation unit 1, particularly due to its maximum particle saturation.

[0047] A sectional view of the base filter element 3 is shown in Fig. 5. This shows that the base filter element 3 has a common frame 18 to which both a first filter layer 11 and a second filter layer 12 are attached. The first filter layer 11 and the second filter layer 12 are spaced from one another and, in particular, applied parallel to the frame 18. In addition, the first filter layer 11 and the second filter layer 12 can comprise, for example, a hydrophilic filter material. This prevents aeration of the base filter element 3. At the same time, the base filter element 3 serves as a reservoir that stores the contents of the storage tank 2. The filter material also preferably has a pore size of 50 micrometers and is, in particular, designed as a depth filter.

[0048] In the illustrated embodiment, two additional filter elements 8, 9 are provided. Other embodiments may include additional filter elements. The number of additional filter elements 8, 9 depends in particular on the expected degree of contamination of the fluid present within the storage tank 2, as well as on the desired degree of purity of the fluid withdrawn from the storage tank 2.

[0049] In the exemplary embodiment, an aqueous solution, such as urea, is stored in the storage tank 2. Alternatively, the storage tank 2 can also accommodate oily substances. In this case, the hydrophilic filter material simply needs to be replaced with olephilic filter material and the hydrophobic filter material with oleophobic filter material.

Claims

[1] Tank installation unit (1) for insertion into a storage tank (2), in particular for operating fluids of motor vehicles, comprising • a basic filter element (3), • a basic module (4) for holding the basic filter element (3), and • a holding device (7) with an additional filter element (8, 9), • wherein the base filter element (3) extends along a filter surface (5) of the surface (6) of the base module (4), • wherein the additional filter element (8, 9) is held by the holding device (7) in such a way that the base filter element (3) is arranged between the base module (4) and the additional filter element (8, 9), and • wherein a base area (15) of the additional filter element (8, 9) is larger than the filter area (5) of the basic module (4). [2] Tank installation unit (1) according to claim 1, characterized by that a heating device (10) is arranged between the base filter element (3) and the additional filter element (8,9). [3] Tank installation unit (1) according to claim 2, characterized by that the heating device (10) is arranged closer to the base filter element (3) than to the additional filter element (8, 9). [4] Tank installation unit (1) according to claim 2 or 3, characterized by that a distance between the heating device (10) and the base filter element (3) is between 1 mm and 8 mm, preferably between 3 mm and 6 mm, and / or that a distance between the heating device (10) and the additional filter element (8, 9) is at least 5 mm, in particular at least 10 mm. [5] Tank installation unit (1) according to one of the preceding claims, characterized by that the base filter element (3) comprises a hydrophilic or oleophilic filter material. [6] Tank installation unit (1) according to one of the preceding claims, characterized bythat the additional filter element (8, 9) comprises a first additional filter element (8) and at least one second additional filter element (9), wherein the second additional filter element (9) is arranged between the first additional filter element (8) and the base filter element (3). [7] Tank installation unit (1) according to claim 6, characterized by that a distance between the first additional filter element (8) and the second additional filter element (9) is between 1 cm and 5 cm, preferably between 2 cm and 4 cm. [8] Tank installation unit (1) according to claim 6 or 7, characterized by that at least the first additional filter element (8) comprises a hydrophobic or oleophobic filter material. [9] Tank installation unit (1) according to one of claims 6 to 8, characterized bythat a pore size of a filter material of the first additional filter element (8) is larger than a pore size of a filter material of the second additional filter element (9), wherein the pore size of the filter material of the second additional filter element (9) is larger than a pore size of a filter material of the base filter element (3). [10] Tank installation unit (1) according to one of the preceding claims, characterized by that the base filter element (3) has a first filter layer (11) and a second filter layer (12) arranged parallel to the first filter layer (11). [11] Tank installation unit (1) according to one of the preceding claims, characterized by that a surface area of ​​the filter surface (5) of the base module (4) comprises a maximum of 90%, preferably a maximum of 75%, particularly preferably a maximum of 60%, of a surface area of ​​the base surface (15) of the additional filter element (8,9). [12] Tank installation unit (1) according to one of the preceding claims, characterized bythat the holding device (7) guides fluid from the additional filter element (8, 9) to the base filter element (3), wherein the holding device (7) has an additional opening (13) via which fluid can be guided to the base filter element (3) bypassing the additional filter element (8, 9). [13] Tank installation unit (1) according to one of the preceding claims, characterized by that a pump is arranged on the base module (4), which pump is covered by a pump dome (14), wherein the holding device (7) is attached to the pump dome (14). [14] Tank installation unit (1) according to one of the preceding claims, characterized by that a fill level sensor (16) and / or a quality sensor (17) is arranged on the base module (4), in particular outside the holding device (7). [15] Storage tank (2) comprising a tank installation unit (1) according to one of the preceding claims, wherein the storage tank (2) can be used to store in particular operating materials, particularly preferably fuels or urea solution, for motor vehicles.

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