Expansion tank

Abstract

Present disclosure relates to an expansion tank for a vehicle cooling system for storing a coolant for distribution in the vehicle cooling system, the expansion tank comprises one or more coolant inlets for receiving the coolant from a coolant line of the vehicle cooling system, one or more coolant outlets for returning the coolant to the coolant line of the vehicle cooling system, the one or more coolant outlets being arranged vertically below the one or more coolant inlets, and a centrifugal separator.

Description

TECHNICAL FIELD

[0001] The disclosure relates generally to vehicle cooling systems. In particular aspects, the disclosure relates to an expansion tank. The disclosure can be applied to heavy-duty vehicles, such as trucks, buses, and construction equipment, among other vehicle types. Although the disclosure may be described with respect to a particular vehicle, the disclosure is not restricted to any particular vehicle.BACKGROUND

[0002] In modern vehicle designs, efficient cooling systems are important for maintaining engine performance and longevity. An important component of these systems may be the expansion tank, which serves multiple purposes, including storing excess coolant, accommodating thermal expansion, and maintaining pressure equilibrium within the system. Without a properly functioning expansion tank, the cooling system's efficiency can be compromised, leading to potential overheating and damage.

[0003] Traditional expansion tanks present several limitations that necessitate improvements. For instance, gravity-based systems often require the expansion tank to be positioned at the highest point in the cooling system, imposing significant design constraints and limiting installation flexibility. This positioning can be impractical in compact or complex vehicle architectures, where space is at a premium.

[0004] Moreover, conventional expansion tanks struggle with efficiently removing air and other gases from the coolant. The presence of trapped gases can lead to reduced heat transfer efficiency and increased risk of cavitation in the coolant pump, ultimately degrading the performance of the entire cooling system. The slow and often incomplete degassing process in traditional systems fails to meet the demands of modern high-performance engines, which require rapid and thorough air removal to maintain optimal cooling.

[0005] Furthermore, existing solutions often lack the ability to handle varying vehicle orientations and dynamic conditions, such as steep inclines or rapid acceleration. The reliance on static degassing mechanisms means that any change in vehicle orientation can lead to air pockets forming within the cooling system, further compromising its effectiveness.

[0006] Given these shortcomings, there is a clear need for advancements in expansion tank technology.SUMMARY

[0007] According to a first aspect of the disclosure, an expansion tank for a vehicle cooling system for storing a coolant for distribution in the vehicle cooling system may be provided. The expansion tank comprises one or more coolant inlets for receiving the coolant from a coolant line of the vehicle cooling system, one or more coolant outlets for returning the coolant to the coolant line of the vehicle cooling system, the one or more coolant outlets being arranged vertically below the one or more coolant inlets, and a centrifugal separator adapted to degas the coolant, the centrifugal separator being at least partially arranged vertically below the one or more coolant inlets and located between the one or more coolant inlets and the one or more coolant outlets. The first aspect of the disclosure may seek to improve the efficiency of coolant degassing and system installation flexibility. A technical benefit may include enhanced degassing efficiency and installation flexibility compared to traditional expansion tank systems.

[0008] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets and the one or more coolant outlets are arranged on the same side of a first vertical central plane of the expansion tank. A technical benefit may include more efficient degassing and an improved ease of installation in the vehicle cooling system.

[0009] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets and the one or more coolant outlets are arranged on the same side of a second vertical central plane of the expansion tank, the second vertical central plane being orthogonal to the first vertical central plane. A technical benefit may include more efficient degassing and an improved ease of installation in the vehicle cooling system.

[0010] Optionally in some examples, including in at least one preferred example, the horizontal distance between a vertical center axis of the centrifugal separator and the one or more coolant inlets corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank in a direction parallel to said horizontal distance. A technical benefit may include accommodating for a more compact design of the expansion tank and improved space optimization within the vehicle.

[0011] Optionally in some examples, including in at least one preferred example, the centrifugal separator is integrated into a casing forming the expansion tank. A technical benefit may include reduced assembly time and / or improved structural integrity of the expansion tank.

[0012] Optionally in some examples, including in at least one preferred example, the centrifugal separator is attached or mounted to an inside or outside of a casing of the expansion tank. A technical benefit may include flexibility in design and potential for retrofit applications.

[0013] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets are connected to the centrifugal separator via at least one coolant inlet flow channel extending at least partially in a horizontal direction. A technical benefit may include streamlined coolant flow and reduced turbulence.

[0014] Optionally in some examples, including in at least one preferred example, the at least one coolant inlet flow channel is integrally formed in a baffle wall of the expansion tank. A technical benefit may include simplified manufacturing and a potentially reduced component count.

[0015] Optionally in some examples, including in at least one preferred example, the centrifugal separator comprises an inlet portion for receiving coolant from the one or more coolant inlets and an outlet portion for passing the coolant to the one or more coolant outlets. A technical benefit may include efficient separation of air and coolant in a space-efficient manner.

[0016] Optionally in some examples, including in at least one preferred example, the inlet portion is arranged vertically above a horizontal central plane of the expansion tank. A technical benefit may include an improved space-efficiency and a faster degassing.

[0017] Optionally in some examples, including in at least one preferred example, the inlet portion is provided with inlet guiding vanes for preventing upward flow of the coolant at said inlet portion. A technical benefit may include reduced risk of air entrainment and improved degassing performance.

[0018] Optionally in some examples, including in at least one preferred example, one or more gas outlets for venting the removed gas from the centrifugal separator are provided. A technical benefit may include effective removal of separated gases, reducing pressure buildup.

[0019] Optionally in some examples, including in at least one preferred example, the one or more gas outlets are oriented to extend radially with respect to the inlet portion. A technical benefit may include minimized obstruction to coolant flow and efficient gas venting.

[0020] Optionally in some examples, including in at least one preferred example, the centrifugal separator may comprise one or more centrifugal separator fluid outlets extending radially from the outlet portion of the centrifugal separator. A technical benefit may include smooth transition of coolant and reduced flow resistance.

[0021] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets comprises a first and second coolant inlet each being connected to the centrifugal separator via a respective coolant inlet flow channel. A technical benefit may include balanced coolant distribution and enhanced system reliability.

[0022] Optionally in some examples, including in at least one preferred example, the centrifugal separator comprises a rounded outer wall, wherein the one or more coolant inlet flow channels are adapted to direct the coolant towards the rounded outer wall such that the inertia of the coolant causes the coolant to move around the rounded outer wall in a vortex such that the pressure of the coolant causes the gas to move toward a center axis of the centrifugal separator. A technical benefit may include improved efficiency in gas separation from the coolant.

[0023] Optionally in some examples, including in at least one preferred example, the rounded outer wall is provided with guiding vanes for guiding the vortex movement of the coolant. A technical benefit may include an improved degassing performance.

[0024] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets and the one or more coolant outlets are arranged on the same side of a first vertical central plane of the expansion tank and the one or more coolant inlets and the one or more coolant outlets are arranged on the same side of a second vertical central plane of the expansion tank, the second vertical central plane being orthogonal to the first vertical central plane, wherein the horizontal distance between a vertical center axis of the centrifugal separator and the one or more coolant inlets corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank in a direction parallel to said horizontal distance and the centrifugal separator is integrated into a casing forming the expansion tank. A technical benefit may include enabling of an improved compactness and space efficiency in the expansion tank design.

[0025] According to a second aspect of the disclosure, a vehicle cooling system is provided. The vehicle cooling system comprises an expansion tank of any of the examples described herein.

[0026] According to a third aspect of the disclosure, a vehicle is provided. The vehicle comprises the vehicle cooling system according to any of the examples provided herein.

[0027] The disclosed aspects, examples (including any preferred examples), and / or accompanying claims may be suitably combined with each other as would be apparent to anyone of ordinary skill in the art. Additional features and advantages are disclosed in the following description, claims, and drawings, and in part will be readily apparent therefrom to those skilled in the art or recognized by practicing the disclosure as described herein.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Examples are described in more detail below with reference to the appended drawings. FIG. 1 is an exemplary vehicle according to an example. FIG. 2A is a schematic depiction of an expansion tank according to an example. FIG. 2B is a schematic depiction of an expansion tank according to an example. FIG. 2C is a schematic depiction of an expansion tank according to an example. FIG. 3 is a perspective top view of an upper side of a top portion of an expansion tank according to an example. FIG. 4 is a perspective view of a bottom side of the top portion of FIG. 3 according to an example. FIG. 5 is a perspective view of a top side of a bottom portion of an expansion tank according to an example. FIG. 6 is another perspective view of the top side of the bottom portion of FIG. 5 according to an example. FIG. 7 is a perspective view of a bottom side of the bottom portion of FIG. 5-6 according to an example. FIG. 8 is a cross-section view of the bottom portion of an expansion tank according to an example. FIG. 9 is a cross-section view of the centrifugal separator of an expansion tank according to an example. DETAILED DESCRIPTION

[0029] The detailed description set forth below provides information and examples of the disclosed technology with sufficient detail to enable those skilled in the art to practice the disclosure.

[0030] FIG. 1 illustrates a schematic representation of a vehicle 1. The vehicle 1 comprises a vehicle cooling system 10. The vehicle cooling system 10 is installed within the vehicle 1. The vehicle cooling system 10 is configured to provide cooling for at least one thermally managed component 2 of the vehicle 1.

[0031] In some embodiments, the vehicle cooling system 10 is designed to manage the thermal conditions of various components within the vehicle, such as an internal combustion engine, a battery pack, or a fuel cell stack, which, in such embodiments, may be collectively represented as the aforementioned thermally managed component 2.

[0032] The vehicle cooling system 10 may be configured to provide cooling to the thermally managed component 2 by means of circulation of a coolant. The coolant may be any conventional suitable coolant such as a water-based coolant, an oil-based coolant, a glycol-based coolant or mixtures thereof.

[0033] The vehicle cooling system 10 may comprise a heat exchanger 11, such as a radiator. The heat exchanger 11 may be configured to dissipate heat from the coolant as it circulates through the system.

[0034] The vehicle cooling system 10 may comprise a cooling pump 13. The cooling pump 13 may be configured to control the flow of coolant through one or more coolant lines 14 connecting the components of the vehicle cooling system 10.

[0035] The vehicle cooling system 10 comprises an expansion tank 100. The expansion tank 100 may serve to accommodate changes in coolant volume due to temperature fluctuations and to maintain the system pressure in the vehicle cooling system 10. As depicted, the expansion tank 100 may be arranged upstream from the cooling pump 13.

[0036] In the depicted example, the coolant lines 14 connect the cooling pump 13 and the expansion tank 100. The coolant lines 14 may form a closed-loop system. The coolant lines 14 may be routed to the thermally managed component 2.

[0037] In the depicted example, the cooling pump 13 may be configured to pump coolant from the expansion tank 100 towards the thermally managed component 2 via the heat exchanger 11 and then back to the expansion tank 100.

[0038] Notably, the vehicle cooling system 10 is depicted for exemplary purposes only. As the skilled person recognizes, the expansion tank 100 according to the present disclosure may be implemented in a number of cooling system configurations.

[0039] The expansion tank 100 commonly plays an important role in the vehicle cooling system 10 by accommodating thermal expansion of the coolant, thereby preventing excess pressure buildup within the system. To serve this purpose, the expansion tank 100 may be positioned adjacent to the cooling pump 13. This placement ensures that the expansion tank can effectively manage the changes in coolant volume as the temperature fluctuates during vehicle operation.

[0040] Functionally, the expansion tank 100 may acts as a reservoir for excess coolant, allowing for expansion and contraction without causing system stress. It also helps to maintain proper pressure levels, which is vital for preventing cavitation in the cooling pump 13 and ensuring consistent coolant flow.

[0041] The present disclosure relates to an expansion tank for a vehicle cooling system, e.g. an expansion tank for a vehicle cooling system and for storing a coolant for distribution in the vehicle cooling system. The vehicle cooling system may be the vehicle cooling system 10 described with reference to FIG. 1. The expansion tank may be designed to enhance space efficiency and provide rapid degassing of the coolant. The expansion tank may incorporate a strategically positioned centrifugal separator within the expansion tank, allowing for swift and effective removal of air and gases from the coolant. By arranging the coolant outlets vertically below the inlets, the expansion tank maximizes spatial efficiency, making it ideal for modern vehicles where space is often limited.

[0042] FIG. 2A schematically depicts an example of the expansion tank 100 according to one embodiment of the present disclosure. The expansion tank 100 comprises one or more coolant inlets 111 for receiving the coolant from the coolant line 14 of the vehicle cooling system 10. The expansion tank 100 comprises one or more coolant outlets 112 arranged vertically below the one or more coolant inlets 111. The expansion tank 100 comprises a centrifugal separator 116. The centrifugal separator 116 is adapted to degas the coolant. The centrifugal separator 116 is at least partially arranged vertically below the one or more coolant inlets 111 and the one or more coolant outlets 112. In some examples, the centrifugal separator 116 may be in its entirety arranged vertically below the one or more coolant inlets 111. In some examples, a portion of the centrifugal separator 116 may extend vertically above at least one of the one or more coolant inlets 111. Advantageously, the one or more coolant inlets 111 may be arranged such that the coolant may flow into the centrifugal separator 116 under the action of gravity.

[0043] In the depicted example, the coolant may flow from the at least one thermally managed component 2 via the coolant line 14, into one or more coolant inlets 111, whereafter it travels to the centrifugal separator 116 whereat the coolant is degassed. After the coolant is degassed, the coolant exits the expansion tank 100 via the one or more coolant outlets 112 and returns to the coolant line 114.

[0044] In the depicted example, the one or more coolant inlet 111 is in direct fluid communication with the centrifugal separator 116. Hence, the one or more coolant inlet 111 may extend into the centrifugal separator 116. It may however be envisioned that intermediate channels may be utilized for distributing the coolant from the one or more coolant inlet 111 to the centrifugal separator 116.

[0045] FIG. 2B schematically depicts an example of the expansion tank 100 according to one embodiment of the present disclosure. The expansion tank 100 may comprise one or more coolant inlets 111 and one or more coolant outlets 112 and a centrifugal separator 116 as described with reference to FIG. 2A. In addition, the expansion tank 100 may comprise one or more coolant inlet flow channels 160. The one or more coolant inlets 111 may be connected to the centrifugal separator 116 via the at least one coolant inlet flow channel 160. The at least one coolant inlet flow channel 160 may extend at least partially in a horizontal direction. In one example, the at least one coolant inlet flow channel 160 may extend in a horizontal direction.

[0046] Accordingly, the expansion tank 100 includes one or more coolant inlets 111, one or more coolant inlet flow channels 160 that connect the one or more coolant inlets 111 to a centrifugal separator 116 connected to one or more coolant outlets 112. Advantageously, the coolant flows from the at least one thermally managed component 2 via the coolant line 14, into one or more coolant inlets 111, whereafter it travels to the centrifugal separator 116, via the one or more coolant inlet flow channels 160, whereat the coolant is degassed. After the coolant is degassed, the coolant exits the expansion tank 100 via the one or more coolant outlets 112 and returns to the coolant line 114.

[0047] Within the scope of the present embodiment, the one or more coolant outlets 112 may be arranged vertically below the one or more coolant inlets 111, as illustrated, so that the coolant flows downward as it passes through the centrifugal separator 116 from the one or more cooling inlets 111 to one or more cooling outlets 112 whereby the expansion tank 100 is a gravity-based expansion tank 100. The one or more coolant inlets 111 may be arranged at a top portion 110A of the expansion tank 100 and the one or more coolant outlets 112 may be arranged a bottom portion 110B of the expansion tank 100.

[0048] Although the one or more coolant inlets 111 may directly connect to the centrifugal separator 116 in alternative embodiments, the one or more coolant inlets 111 may also be connected to the centrifugal separator 116 via the at least one coolant inlet flow channel 160, as shown. Additionally, the one or more cooling inlets 111 may lead to a inlet chamber 198 internal to the expansion tank 160, and at least one coolant inlet flow channel 160 may extend from the inlet chamber 198 to the centrifugal separator 116. Within the scope of the present embodiment, the coolant inlet flow channel 160 may extend at least partially in a horizontal direction. The expansion tank 100 is provided with one or more coolant outlets 112. In alternative embodiments, the coolant outlet 112 may be directly connected to the lower end of the centrifugal separator 116 and then connect directly to the coolant line 14, however, in the presently illustrated embodiment shown, a centrifugal separator fluid outlet 113 , extending from the outlet portion 1155 of the centrifugal separator 116, leads to a degassed fluid holding chamber 199 located in the expansion tank 100, external to the centrifugal separator 116, and the coolant outlet 112 extends from the degassed fluid holding chamber 199 and connects to coolant line 14. In yet another alternative embodiment shown in FIG. 2C, a coolant outlet flow channel 196 may extend from centrifugal separator fluid outlet 113 to the coolant outlet 112. Accordingly, the centrifugal separator 116 may comprise one or more centrifugal separator fluid outlets 113. The one or more centrifugal separator fluid outlets 113 may extend radially outward from the outlet portion 1155 of the centrifugal separator 116.

[0049] Advantageously, the coolant is directed into the centrifugal separator 116 so that it spins, creating a vortex that effectively separates air and gases from the coolant, e.g. the coolant liquid, as the coolant spins and descends within the centrifugal separator 116. The degassed coolant then exits the centrifugal separator 116 through the one or more coolant outlets 112 positioned below the one or more coolant inlet(s) 111, ensuring a smooth flow through vehicle's cooling system 10.

[0050] The expansion tank 100 shown is provided with at least one gas outlet 171 for venting gas removed from the coolant by the centrifugal separator 116. The gas outlet 171 may extend radially outward with respect to the centrifugal separator 116.

[0051] Turning now to FIGS. 3-9, which show a detailed view of an expansion tank 100 embodying features of the embodiment shown in FIG. 2A-C, in the depicted embodiment, the expansion tank 100 comprises a casing 140. The casing 140 of the expansion tank 100 may be configured to accommodate any internal components of the expansion tank 100. Preferably, the casing 140 may be made from materials desirably resistant to thermal and chemical stress, to enhance longevity and reliability under various operating conditions.

[0052] In one example, the one or more coolant inlets 111 and / or the one or more coolant outlets 112 may be molded into the casing 140. This may allow for ensuring secure connections with the coolant line 14. In one example, the casing 140 may incorporate features such as mounting brackets or tabs to simplify installation and provide stability.

[0053] The casing of the expansion tank 100 may be constructed from a variety of materials such as polymeric materials, for example polypropylene or polyethylene, or metals, for example aluminum or steel, e.g. stainless steel. Polypropylene (PP) may be selected due to its lightweight nature and resistance to corrosion. Alternatively, aluminum may be used for its thermal conductivity and durability, particularly in high-performance vehicles. Alternatively, Polyethylene (PE) may be used due to its chemical resistance and flexibility which may handle a wide range of temperatures. Stainless steel may be selected due to providing robust structural integrity and being generally capable of withstanding high temperatures and pressures, suitable for demanding applications.

[0054] Although FIGS 3-9 show one possible example, in alternative embodiments, the casing 140 can be alternative shapes, including, but not limited to cylindrical, rectangular, irregular or oval. A cylindrical shape may be positive in terms of achieving volume while minimizing surface area to support efficient degassing. A rectangular shape may allow for easy integration into confined spaces for example within the engine compartment of a vehicle. For specific vehicle architectures, an irregular or custom shape may also be utilized as such a shape may be adapted in accordance with the available space with a substantially maintained performance. An oval design may allow for a balance capacity and compactness.

[0055] Further referencing FIG. 3, the expansion tank 100 shown includes a gas inlet 141 and / or a gas outlet 142. The gas inlet 141 and the gas outlet 142 may serve to manage the internal pressure within the expansion tank 100. The gas outlet 141 may be configured to reduce air pressure within the expansion tank 100, such as for example, as the coolant expands when heated, and to accommodate the venting of gases, e.g. gases separated from the coolant by means of the centrifugal separator 115. The gas inlet 142 may be configured to accommodate the introduction of pressurized gas into the expansion tank. Introducing and releasing pressure may be performed to help maintain a constant pressure or optimal pressure within the expansion tank 100.

[0056] As shown in the depicted example, the casing 140 comprises a top casing part 140A and a bottom casing part 140B. The top casing part 140A and the bottom casing part 140B may be joined together to form the casing 140.

[0057] The gas inlet and outlet 141, 142 may be located in the top casing part 140A, as shown. The top casing part 140A may also be provided with one or more coolant inlets 111, such as first and second cooling inlets 111A, 111B. As illustrated, the coolant inlets 111A, 111B may be in fluid communication with the interior of the casing 140. The first coolant inlet 111A and the second coolant inlet 111B may be arranged adjacent to each other, as shown. Additionally, as shown, the first coolant inlet 111A and the second coolant inlet 111B may be arranged parallel to each other.

[0058] Turning now to FIG. 4, which shows a perspective view of a bottom side of the top casing part 140A of the expansion tank 100, e.g. an inner top side of the interior of the casing 140 of the expansion tank 100, channels 160A, 160B may be integrally formed in the expansion tank 100. In the depicted example, the first coolant inlet 111 is connected to the centrifugal separator 116 via a first coolant inlet flow channel 160A and the second coolant inlet 112 is connected to the centrifugal separator 116 via a second coolant inlet flow channel 160B. As shown, in the present illustrated embodiment, top half of the first and second channels 160A and 160B may be located on the upper casing part 140A and the bottom half may be located on the lower casing part 140B, as shown in FIG. 5, so that when the top casing part 140A and bottom casing part 140B are joined together to form the casing 140 coolant inlet flow channels 160A and 160B are defined with the expansion tank 100.

[0059] The coolant inlet flow channels 160A, 160B may extend at least partially horizontally inside the interior of the expansion tank 100, e.g. inside the casing 140. As shown, a baffle wall 181 may be integrated into the casing 140 and the coolant inlet flow channel 160B may located at least partially therein. Although in the embodiment illustrated in FIG 4, the first and second coolant inlet flow channels 160A, 160B follow different routes to the centrifugal separator, in alternative embodiments, the first and second coolant inlet flow channels 160A, 160B may extend parallel to each other. In one example, the first coolant inlet flow channel 160A and the second coolant inlet flow channel 160B may each be integrally formed in a baffle wall 181.

[0060] As shown in FIGS 4 and 5, the centrifugal separator 116 includes an inlet portion 1151 for receiving coolant from the one or more coolant inlets 111 or coolant inlet flow channels 160A, 160B. The centrifugal separator 116 also includes an outlet portion 1155 The inlet portion 1151 is located axially above the outlet portion 1155. The outlet portion 1155, which will be described in further detail with reference to FIG. 6, may comprise one or more centrifugal separator fluid outlets 113A, 113B for passing the coolant to the one or more coolant outlets 112. The inlet portion 1151 may be arranged vertically above a horizontal central plane of the expansion tank 100. The outlet portion 1155 may be arranged vertically below a horizontal central plane of the expansion tank 100. Located between the inlet portion 1151 and the outlet portion 1155 at the horizontal central plane of the expansion tank 100 is a degassing portion 1159 where the coolant swirls as degassing occurs.

[0061] The centrifugal separator 116 comprises a cavity that extends vertically within the expansion tank defined by a rounded outer wall 1161, e.g. a cylindrical outer wall 1161. According to aspects of embodiments, the one or more coolant inlets 111 or coolant inlet flow channels 160A, 160B may be adapted to direct the coolant towards the rounded outer wall 1161 such that the inertia of the coolant causes the coolant to move around the rounded outer wall 1161 in a vortex such that the pressure of the coolant causes the gas to move toward a center of the centrifugal separator. The one or more coolant inlets 111 or coolant inlet flow channels 160A, 160B preferably terminate in a manner whereby they extend substantially tangentially to the rounded outer wall 1161. Accordingly, the inertia of the coolant will cause the liquid to press against the rounded outer wall 1161 while the gas will move towards a longitudinal center axis, preferably vertical center axis, of the centrifugal separator 116. Thereby, the gas is separated from the liquid. Upon separation, the gas may rise and exit through the one or more gas outlets 171.

[0062] Additionally, the rounded outer wall 1161 may be provided with helical guiding vanes 1163 extending in a spiral pattern around the longitudinal center axis, e.g. vertical center axis at a downward angle. Thereby, the coolant is guided towards the bottom of the centrifugal separator 116. The guiding vanes 1163 may cause a centrifugal flow downwards around the longitudinal center axis. Thereby, the centrifugal forces may be further intensified, allowing for a more efficient separation of the gas from the liquid. Alternatively, radial vanes may be positioned around the centrifugal separator 116 to direct the coolant outward, maximizing contact with the rounded outer wall 1161 and improving separation. Such radial vanes may extend as annular flanges protruding radially and inwardly from the rounded outer wall 1161 towards the longitudinal center axis. The radial vanes may be arranged at set distances from each other along the longitudinal center axis. It is noted however, that it may be envisioned that the rounded outer wall 1161 may be provided as a smooth wall, e.g. without any guiding vanes.

[0063] The difference in density between the gas and the coolant causes the gas to flow upwards towards the one or more gas outlets 171. The one or more gas outlet 171 may extend radially outward relative to the centrifugal separator 115 and be in fluid communication with a gas chamber 1157 of the expansion tank 100, external to the centrifugal separator 116. For venting the gas removed from the coolant in the centrifugal chamber 116, the gas outlet 171 may be provided with a first end 171A extending from the inlet portion 1151 of the centrifugal separator and a second end 171B extending from the gas chamber 1157. In FIG. 4, the gas outlet 171 may extend through the rounded outer wall 1161. According to embodiments of the present disclosure, the first end 171A may be located above the coolant inlets 111 or coolant inlet flow channels 160A, 160B in the inlet portion 1151, so that as the coolant spirals downward it is less likely to enter the gas outlet 171.

[0064] The gas outlet 171 may include a gas outlet flow channel 171C that extends from the first end 171A to the second end 171B. The gas outlet flow channel 171C is depicted as a dotted line in FIG. 4. As shown, the first end 171A opens towards the inlet portion 1151 and the second end 171B opens into the gas chamber 1157 of the expansion tank 100, external to the centrifugal separator 116. As shown, at least a portion of the gas chamber 1157 may extend or be located downward relative to the first end 171A. Advantageously, the gas released from the coolant may flow upwards towards the upper end of the inlet portion 1151 after it is removed from the coolant that is flowing downward towards the outlet portion 1155. Then, the gas released from the coolant will travel at least partially horizontally and radially outward through gas outlet flow channel 171C, and then downward through the second end 171B. Next, the gas will flow downward through the gas chamber 1157.

[0065] Whereas the gas flows upwards within the centrifugal separator 116, upon the coolant, e.g. the degassed coolant, reaching lower the outlet portion 1155, the fluid outlets 113A, 113B may be oriented to extend in a radial direction so that the coolant may flow out of the centrifugal chamber 116 in a radial direction relative to the longitudinal center axis, e.g. vertical center axis C, or, alternatively, to face substantially tangentially relative to the rounded outer wall 1161 so that the coolant may flow out of the centrifugal chamber 116 in a tangential direction relative to the rounded outer wall 1161, whereafter it may be held within the degassed fluid holding chamber 199 of the expansion tank before being return to the coolant line 14 via one or more coolant outlets 112.

[0066] Further referencing FIG. 4, the inlet portion 1151 may be provided with inlet guiding vanes 1152 for preventing upward flow of the coolant at the inlet portion 1151. In the depicted example, the inlet guiding vanes 1152 may be provided as helical guiding vanes. The inlet guiding vanes 1152 may be arranged as a part of the guiding vanes 1163 or separately. The inlet guiding vanes 1152 may be configured to be arranged at the inlet portion 1151. The inlet guiding vanes 1152 may be configured to be arranged directly downstream of the one or more coolant inlet channels 160. The inlet guiding vanes 1152 may guide the coolant flowing from the one or more coolant inlet channels 160 downwards from the inlet portion 1151. In one example, the inlet guiding vanes 1152 may have a downward facing orientation for guiding the coolant downwards towards the outlet portion 1155.

[0067] In the depicted example, the centrifugal chamber 116 is formed by the inside of the casing 140, e.g. the interior of the casing 140. It may however be envisioned that the centrifugal separator 116 is mounted to the inside or an outside, such as a bottom side, of the casing 140, e.g. the exterior bottom side of the casing 140.

[0068] In FIG. 4 both the one or more coolant inlet 111 and the one or more coolant outlet 112 are visible. Advantageously, the one or more coolant inlet 111 and the one or more coolant outlets 112 may be arranged on the same side of a first vertical central plane V1 of the expansion tank 100.

[0069] The arrangement of the coolant inlet and outlets on the same side of a first vertical central plane within the expansion tank offers several advantages. By aligning these components, the coolant's path through the expansion tank 100 may be shortened, minimizing resistance and turbulence. This configuration may reduce the distance the coolant must travel, allowing for quicker transit through the system. This may not only enhance the overall cooling performance but also contribute to rapid degassing, as the coolant can swiftly reach and pass through the centrifugal separator 116. Additionally, this design can lead to a more compact and space-efficient tank, which is particularly beneficial in modern vehicles where space is limited. Overall, this arrangement may improve fluid dynamics within the expansion tank, improving the efficiency and reliability of the vehicle's cooling system.

[0070] The above may apply for both directions. Hence, the one or more coolant inlets 111 and the one or more coolant outlets 112 may be arranged on the same side of a second vertical central plane V2 of the expansion tank 100. The second vertical central plane V2 may be orthogonal to the first vertical central plane V1.

[0071] Moreover, the one or more coolant inlets 111 and the one or more coolant outlets 112 may be arranged in the same delimited vertically extending space, delimited horizontally by the first vertical central plane V1 and the second vertical central plane V2.

[0072] The centrifugal separator 116 may also be arranged on the same side of the first vertical central plane V1 and preferably on the same side of the second vertical central plane V2 as the one or more coolant inlet 111 and the one or more coolant outlet 112.

[0073] FIG. 7 depicts the bottom side of the bottom portion of the expansion tank 100 of FIG. 5-6. As depicted, the outlet 112 may extend at a downward angle from the fluid holding chamber 199 in the casing 140 of the expansion tank 100. The outlet 112 may be configured to be connected to, e.g. to be in fluid communication with the coolant line 14.

[0074] Further referencing FIG. 7, the expansion tank 100 may comprise a mounting bracket 144. The mounting bracket 144 may be configured to be mounted to a chassis of the vehicle 1 for mounting of the expansion tank 100. The mounting bracket 144 may be provided on the bottom portion of the expansion tank 100. In the depicted example, the bracket 144 may form an integral part of the casing 140.

[0075] FIG. 8 depicts a cross-section of the bottom portion of the expansion tank 100.

[0076] The outlet portion 1155 may be arranged vertically below the horizontal central plane H of the expansion tank 10, as shown in FIG. 8. The inlet portion 1151 may be arranged vertically above the horizontal central plane H of the expansion tank 10..

[0077] In order to facilitate rapid flow of the coolant as well as efficient degassing, the horizontal distance between the coolant inlets 111 and the vertical center axis C of the centrifugal separator 116 should preferably be as small as possible. The horizontal distance may advantageously correspond to less than 30% and preferably less than 20% of the total expansion tank 100 in a direction parallel to the horizontal distance. Accordingly, the ratio between the horizontal distance and the total horizontal distance of the expansion tank 100 should preferably be 0.3 and more preferably 0.2.

[0078] FIG. 8 further depicts the center axis C of the centrifugal separator 116. As depicted, the center axis C may extend vertically. In the depicted example, the guiding vanes 1163 may extend in a helix around said center axis C.

[0079] According to an aspect an expansion tank, vehicle cooling system and vehicle in accordance with any of the following examples may be provided.

[0080] Example 1: Expansion tank (100) for a vehicle cooling system (10) for storing a coolant for distribution in the vehicle cooling system (10), the expansion tank (100) comprising: one or more coolant inlets (111) for receiving the coolant from a coolant line (14) of the vehicle cooling system (10), one or more coolant outlets (112) for returning the coolant to the coolant line (14) of the vehicle cooling system (10), the one or more coolant outlets (112) being arranged vertically below the one or more coolant inlets (111), and a centrifugal separator (116) adapted to degas the coolant, the centrifugal separator (116) being arranged at least partially vertically below the one or more coolant inlets (111) and located between the one or more coolant inlets (111) and the one or more coolant outlets (112).

[0081] Example 2: Expansion tank (100) of Example 1, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a first vertical central plane (V1) of the expansion tank (100).

[0082] Example 3: Expansion tank (100) of Example 2, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a second vertical central plane (V2) of the expansion tank (100), the second vertical central plane (V2) being orthogonal to the first vertical central plane (V1).

[0083] Example 4: Expansion tank (100) of any of Examples 1-3, wherein the horizontal distance between a vertical center axis (C) of the centrifugal separator (116) and the one or more coolant inlets (111) corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank (100) in a direction parallel to said horizontal distance.

[0084] Example 5: Expansion tank (100) of any of Examples 1-4, wherein the centrifugal separator (116) is integrated into a casing (140) of the expansion tank (100).

[0085] Example 6: Expansion tank (100) of any of Examples 1-4, wherein the centrifugal separator (116) is mounted to an inside or outside of a casing (140) of the expansion tank (100).

[0086] Example 7: Expansion tank (100) of any of Examples 1-6, wherein the one or more coolant inlets (111) are connected to the centrifugal separator (116) via at least one coolant inlet flow channel (160) extending at least partially in a horizontal direction.

[0087] Example 8: Expansion tank (100) of Example 7, wherein the coolant inlet flow channel (160) is integrally formed in a baffle wall (181) of the expansion tank (100).

[0088] Example 9: Expansion tank (100) of any of Examples 1-8, wherein the centrifugal separator (116) comprises an inlet portion (1151) for receiving coolant from the one or more coolant inlets (111) and an outlet portion (1155) comprising one or more centrifugal separator fluid outlets (113) for passing the coolant to the one or more coolant outlets (112).

[0089] Example 10: Expansion tank (100) of Example 9, wherein the inlet portion (1151) is arranged vertically above a horizontal central plane (H) of the expansion tank.

[0090] Example 11: Expansion tank of Example 9 or 10, wherein the inlet portion (1151) is provided with inlet guiding vanes (1152) for preventing upward flow of the coolant at said inlet portion (1151).

[0091] Example 12: Expansion tank (100) of any of Examples 1-11, further comprising one or more gas outlet (171) for venting the removed gas from the centrifugal separator (116).

[0092] Example 13: Expansion tank (100) of Example 12, wherein the one or more gas outlet (171) extends radially outward relative to the inlet portion (1151).

[0093] Example 14: Expansion tank (100) of any of Examples 9-13, wherein the outlet portion (1155) comprises one or more centrifugal separator fluid outlets (113) extending radially from the outlet portion (1155) of the centrifugal separator (116).

[0094] Example 15: Expansion tank (100) of any of Examples 1-14, wherein the one or more coolant inlets (111) comprises a first and second coolant inlet (111) each being connected to the centrifugal separator (116)via a respective coolant inlet flow channel (160A, 160B).

[0095] Example 16: Expansion tank (100) of any of Examples 1-15, wherein the centrifugal separator (116) comprises a rounded outer wall (1161), wherein the one or more coolant inlets (111) are adapted to direct the coolant towards the rounded outer wall (1161) such that the inertia of the coolant causes the coolant to move around the rounded outer wall (1161) in a vortex such that the pressure of the coolant causes the gas to move toward a center axis of the centrifugal separator (116).

[0096] Example 17: Expansion tank (100) of Example 16, wherein the rounded outer wall (1161) is provided with guiding vanes (1163) for guiding the vortex movement of the coolant.

[0097] Example 18: Expansion tank of Example 1, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a first vertical central plane (V1) of the expansion tank (100) and the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a second vertical central plane (V2) of the expansion tank (100), the second vertical central plane (V2) being orthogonal to the first vertical central plane (V1), wherein the horizontal distance between a vertical center axis (C) of the centrifugal separator (116) and the one or more coolant inlets (111) corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank (100) in a direction parallel to said horizontal distance and the centrifugal separator (116) is integrated into a casing (140) of the expansion tank (100).

[0098] Example 19: Vehicle cooling system comprising the expansion tank (100) of any of Examples 1-18.

[0099] Example 20: Vehicle (1) comprising the vehicle cooling system (10) of Example 19.

[0100] The terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises," "comprising," "includes," and / or "including" when used herein specify the presence of stated features, integers, actions, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, actions, steps, operations, elements, components, and / or groups thereof.

[0101] It will be understood that, although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0102] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe a relationship of one element to another element as illustrated in the Figures. It will be understood that these terms and those discussed above are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

[0103] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0104] It is to be understood that the present disclosure is not limited to the aspects described above and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the present disclosure and appended claims. In the drawings and specification, there have been disclosed aspects for purposes of illustration only and not for purposes of limitation, the scope of the disclosure being set forth in the following claims.

Examples

example 7

[0086] Expansion tank (100) of any of Examples 1-6, wherein the one or more coolant inlets (111) are connected to the centrifugal separator (116) via at least one coolant inlet flow channel (160) extending at least partially in a horizontal direction.

[0087]Example 8: Expansion tank (100) of Example 7, wherein the coolant inlet flow channel (160) is integrally formed in a baffle wall (181) of the expansion tank (100).

[0088]Example 9: Expansion tank (100) of any of Examples 1-8, wherein the centrifugal separator (116) comprises an inlet portion (1151) for receiving coolant from the one or more coolant inlets (111) and an outlet portion (1155) comprising one or more centrifugal separator fluid outlets (113) for passing the coolant to the one or more coolant outlets (112).

[0089]Example 10: Expansion tank (100) of Example 9, wherein the inlet portion (1151) is arranged vertically above a horizontal central plane (H) of the expansion tank.

[0090]Example 11: Expansion tank of Example 9 or 1...

example 18

[0097] Expansion tank of Example 1, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a first vertical central plane (V1) of the expansion tank (100) and the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a second vertical central plane (V2) of the expansion tank (100), the second vertical central plane (V2) being orthogonal to the first vertical central plane (V1), wherein the horizontal distance between a vertical center axis (C) of the centrifugal separator (116) and the one or more coolant inlets (111) corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank (100) in a direction parallel to said horizontal distance and the centrifugal separator (116) is integrated into a casing (140) of the expansion tank (100).

[0098]Example 19: Vehicle cooling system comprising the expansion tank (100) of any of Examples...

TECHNICAL FIELD

[0001] The disclosure relates generally to vehicle cooling systems. In particular aspects, the disclosure relates to an expansion tank. The disclosure can be applied to heavy-duty vehicles, such as trucks, buses, and construction equipment, among other vehicle types. Although the disclosure may be described with respect to a particular vehicle, the disclosure is not restricted to any particular vehicle.BACKGROUND

[0002] In modern vehicle designs, efficient cooling systems are important for maintaining engine performance and longevity. An important component of these systems may be the expansion tank, which serves multiple purposes, including storing excess coolant, accommodating thermal expansion, and maintaining pressure equilibrium within the system. Without a properly functioning expansion tank, the cooling system's efficiency can be compromised, leading to potential overheating and damage.

[0003] Traditional expansion tanks present several limitations that necessitate improvements. For instance, gravity-based systems often require the expansion tank to be positioned at the highest point in the cooling system, imposing significant design constraints and limiting installation flexibility. This positioning can be impractical in compact or complex vehicle architectures, where space is at a premium.

[0004] Moreover, conventional expansion tanks struggle with efficiently removing air and other gases from the coolant. The presence of trapped gases can lead to reduced heat transfer efficiency and increased risk of cavitation in the coolant pump, ultimately degrading the performance of the entire cooling system. The slow and often incomplete degassing process in traditional systems fails to meet the demands of modern high-performance engines, which require rapid and thorough air removal to maintain optimal cooling.

[0005] Furthermore, existing solutions often lack the ability to handle varying vehicle orientations and dynamic conditions, such as steep inclines or rapid acceleration. The reliance on static degassing mechanisms means that any change in vehicle orientation can lead to air pockets forming within the cooling system, further compromising its effectiveness.

[0006] Given these shortcomings, there is a clear need for advancements in expansion tank technology.SUMMARY

[0007] According to a first aspect of the disclosure, an expansion tank for a vehicle cooling system for storing a coolant for distribution in the vehicle cooling system may be provided. The expansion tank comprises one or more coolant inlets for receiving the coolant from a coolant line of the vehicle cooling system, one or more coolant outlets for returning the coolant to the coolant line of the vehicle cooling system, the one or more coolant outlets being arranged vertically below the one or more coolant inlets, and a centrifugal separator adapted to degas the coolant, the centrifugal separator being at least partially arranged vertically below the one or more coolant inlets and located between the one or more coolant inlets and the one or more coolant outlets. The first aspect of the disclosure may seek to improve the efficiency of coolant degassing and system installation flexibility. A technical benefit may include enhanced degassing efficiency and installation flexibility compared to traditional expansion tank systems.

[0008] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets and the one or more coolant outlets are arranged on the same side of a first vertical central plane of the expansion tank. A technical benefit may include more efficient degassing and an improved ease of installation in the vehicle cooling system.

[0009] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets and the one or more coolant outlets are arranged on the same side of a second vertical central plane of the expansion tank, the second vertical central plane being orthogonal to the first vertical central plane. A technical benefit may include more efficient degassing and an improved ease of installation in the vehicle cooling system.

[0010] Optionally in some examples, including in at least one preferred example, the horizontal distance between a vertical center axis of the centrifugal separator and the one or more coolant inlets corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank in a direction parallel to said horizontal distance. A technical benefit may include accommodating for a more compact design of the expansion tank and improved space optimization within the vehicle.

[0011] Optionally in some examples, including in at least one preferred example, the centrifugal separator is integrated into a casing forming the expansion tank. A technical benefit may include reduced assembly time and / or improved structural integrity of the expansion tank.

[0012] Optionally in some examples, including in at least one preferred example, the centrifugal separator is attached or mounted to an inside or outside of a casing of the expansion tank. A technical benefit may include flexibility in design and potential for retrofit applications.

[0013] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets are connected to the centrifugal separator via at least one coolant inlet flow channel extending at least partially in a horizontal direction. A technical benefit may include streamlined coolant flow and reduced turbulence.

[0014] Optionally in some examples, including in at least one preferred example, the at least one coolant inlet flow channel is integrally formed in a baffle wall of the expansion tank. A technical benefit may include simplified manufacturing and a potentially reduced component count.

[0015] Optionally in some examples, including in at least one preferred example, the centrifugal separator comprises an inlet portion for receiving coolant from the one or more coolant inlets and an outlet portion for passing the coolant to the one or more coolant outlets. A technical benefit may include efficient separation of air and coolant in a space-efficient manner.

[0016] Optionally in some examples, including in at least one preferred example, the inlet portion is arranged vertically above a horizontal central plane of the expansion tank. A technical benefit may include an improved space-efficiency and a faster degassing.

[0017] Optionally in some examples, including in at least one preferred example, the inlet portion is provided with inlet guiding vanes for preventing upward flow of the coolant at said inlet portion. A technical benefit may include reduced risk of air entrainment and improved degassing performance.

[0018] Optionally in some examples, including in at least one preferred example, one or more gas outlets for venting the removed gas from the centrifugal separator are provided. A technical benefit may include effective removal of separated gases, reducing pressure buildup.

[0019] Optionally in some examples, including in at least one preferred example, the one or more gas outlets are oriented to extend radially with respect to the inlet portion. A technical benefit may include minimized obstruction to coolant flow and efficient gas venting.

[0020] Optionally in some examples, including in at least one preferred example, the centrifugal separator may comprise one or more centrifugal separator fluid outlets extending radially from the outlet portion of the centrifugal separator. A technical benefit may include smooth transition of coolant and reduced flow resistance.

[0021] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets comprises a first and second coolant inlet each being connected to the centrifugal separator via a respective coolant inlet flow channel. A technical benefit may include balanced coolant distribution and enhanced system reliability.

[0022] Optionally in some examples, including in at least one preferred example, the centrifugal separator comprises a rounded outer wall, wherein the one or more coolant inlet flow channels are adapted to direct the coolant towards the rounded outer wall such that the inertia of the coolant causes the coolant to move around the rounded outer wall in a vortex such that the pressure of the coolant causes the gas to move toward a center axis of the centrifugal separator. A technical benefit may include improved efficiency in gas separation from the coolant.

[0023] Optionally in some examples, including in at least one preferred example, the rounded outer wall is provided with guiding vanes for guiding the vortex movement of the coolant. A technical benefit may include an improved degassing performance.

[0024] Optionally in some examples, including in at least one preferred example, the one or more coolant inlets and the one or more coolant outlets are arranged on the same side of a first vertical central plane of the expansion tank and the one or more coolant inlets and the one or more coolant outlets are arranged on the same side of a second vertical central plane of the expansion tank, the second vertical central plane being orthogonal to the first vertical central plane, wherein the horizontal distance between a vertical center axis of the centrifugal separator and the one or more coolant inlets corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank in a direction parallel to said horizontal distance and the centrifugal separator is integrated into a casing forming the expansion tank. A technical benefit may include enabling of an improved compactness and space efficiency in the expansion tank design.

[0025] According to a second aspect of the disclosure, a vehicle cooling system is provided. The vehicle cooling system comprises an expansion tank of any of the examples described herein.

[0026] According to a third aspect of the disclosure, a vehicle is provided. The vehicle comprises the vehicle cooling system according to any of the examples provided herein.

[0027] The disclosed aspects, examples (including any preferred examples), and / or accompanying claims may be suitably combined with each other as would be apparent to anyone of ordinary skill in the art. Additional features and advantages are disclosed in the following description, claims, and drawings, and in part will be readily apparent therefrom to those skilled in the art or recognized by practicing the disclosure as described herein.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Examples are described in more detail below with reference to the appended drawings. FIG. 1 is an exemplary vehicle according to an example. FIG. 2A is a schematic depiction of an expansion tank according to an example. FIG. 2B is a schematic depiction of an expansion tank according to an example. FIG. 2C is a schematic depiction of an expansion tank according to an example. FIG. 3 is a perspective top view of an upper side of a top portion of an expansion tank according to an example. FIG. 4 is a perspective view of a bottom side of the top portion of FIG. 3 according to an example. FIG. 5 is a perspective view of a top side of a bottom portion of an expansion tank according to an example. FIG. 6 is another perspective view of the top side of the bottom portion of FIG. 5 according to an example. FIG. 7 is a perspective view of a bottom side of the bottom portion of FIG. 5-6 according to an example. FIG. 8 is a cross-section view of the bottom portion of an expansion tank according to an example. FIG. 9 is a cross-section view of the centrifugal separator of an expansion tank according to an example. DETAILED DESCRIPTION

[0029] The detailed description set forth below provides information and examples of the disclosed technology with sufficient detail to enable those skilled in the art to practice the disclosure.

[0030] FIG. 1 illustrates a schematic representation of a vehicle 1. The vehicle 1 comprises a vehicle cooling system 10. The vehicle cooling system 10 is installed within the vehicle 1. The vehicle cooling system 10 is configured to provide cooling for at least one thermally managed component 2 of the vehicle 1.

[0031] In some embodiments, the vehicle cooling system 10 is designed to manage the thermal conditions of various components within the vehicle, such as an internal combustion engine, a battery pack, or a fuel cell stack, which, in such embodiments, may be collectively represented as the aforementioned thermally managed component 2.

[0032] The vehicle cooling system 10 may be configured to provide cooling to the thermally managed component 2 by means of circulation of a coolant. The coolant may be any conventional suitable coolant such as a water-based coolant, an oil-based coolant, a glycol-based coolant or mixtures thereof.

[0033] The vehicle cooling system 10 may comprise a heat exchanger 11, such as a radiator. The heat exchanger 11 may be configured to dissipate heat from the coolant as it circulates through the system.

[0034] The vehicle cooling system 10 may comprise a cooling pump 13. The cooling pump 13 may be configured to control the flow of coolant through one or more coolant lines 14 connecting the components of the vehicle cooling system 10.

[0035] The vehicle cooling system 10 comprises an expansion tank 100. The expansion tank 100 may serve to accommodate changes in coolant volume due to temperature fluctuations and to maintain the system pressure in the vehicle cooling system 10. As depicted, the expansion tank 100 may be arranged upstream from the cooling pump 13.

[0036] In the depicted example, the coolant lines 14 connect the cooling pump 13 and the expansion tank 100. The coolant lines 14 may form a closed-loop system. The coolant lines 14 may be routed to the thermally managed component 2.

[0037] In the depicted example, the cooling pump 13 may be configured to pump coolant from the expansion tank 100 towards the thermally managed component 2 via the heat exchanger 11 and then back to the expansion tank 100.

[0038] Notably, the vehicle cooling system 10 is depicted for exemplary purposes only. As the skilled person recognizes, the expansion tank 100 according to the present disclosure may be implemented in a number of cooling system configurations.

[0039] The expansion tank 100 commonly plays an important role in the vehicle cooling system 10 by accommodating thermal expansion of the coolant, thereby preventing excess pressure buildup within the system. To serve this purpose, the expansion tank 100 may be positioned adjacent to the cooling pump 13. This placement ensures that the expansion tank can effectively manage the changes in coolant volume as the temperature fluctuates during vehicle operation.

[0040] Functionally, the expansion tank 100 may acts as a reservoir for excess coolant, allowing for expansion and contraction without causing system stress. It also helps to maintain proper pressure levels, which is vital for preventing cavitation in the cooling pump 13 and ensuring consistent coolant flow.

[0041] The present disclosure relates to an expansion tank for a vehicle cooling system, e.g. an expansion tank for a vehicle cooling system and for storing a coolant for distribution in the vehicle cooling system. The vehicle cooling system may be the vehicle cooling system 10 described with reference to FIG. 1. The expansion tank may be designed to enhance space efficiency and provide rapid degassing of the coolant. The expansion tank may incorporate a strategically positioned centrifugal separator within the expansion tank, allowing for swift and effective removal of air and gases from the coolant. By arranging the coolant outlets vertically below the inlets, the expansion tank maximizes spatial efficiency, making it ideal for modern vehicles where space is often limited.

[0042] FIG. 2A schematically depicts an example of the expansion tank 100 according to one embodiment of the present disclosure. The expansion tank 100 comprises one or more coolant inlets 111 for receiving the coolant from the coolant line 14 of the vehicle cooling system 10. The expansion tank 100 comprises one or more coolant outlets 112 arranged vertically below the one or more coolant inlets 111. The expansion tank 100 comprises a centrifugal separator 116. The centrifugal separator 116 is adapted to degas the coolant. The centrifugal separator 116 is at least partially arranged vertically below the one or more coolant inlets 111 and the one or more coolant outlets 112. In some examples, the centrifugal separator 116 may be in its entirety arranged vertically below the one or more coolant inlets 111. In some examples, a portion of the centrifugal separator 116 may extend vertically above at least one of the one or more coolant inlets 111. Advantageously, the one or more coolant inlets 111 may be arranged such that the coolant may flow into the centrifugal separator 116 under the action of gravity.

[0043] In the depicted example, the coolant may flow from the at least one thermally managed component 2 via the coolant line 14, into one or more coolant inlets 111, whereafter it travels to the centrifugal separator 116 whereat the coolant is degassed. After the coolant is degassed, the coolant exits the expansion tank 100 via the one or more coolant outlets 112 and returns to the coolant line 114.

[0044] In the depicted example, the one or more coolant inlet 111 is in direct fluid communication with the centrifugal separator 116. Hence, the one or more coolant inlet 111 may extend into the centrifugal separator 116. It may however be envisioned that intermediate channels may be utilized for distributing the coolant from the one or more coolant inlet 111 to the centrifugal separator 116.

[0045] FIG. 2B schematically depicts an example of the expansion tank 100 according to one embodiment of the present disclosure. The expansion tank 100 may comprise one or more coolant inlets 111 and one or more coolant outlets 112 and a centrifugal separator 116 as described with reference to FIG. 2A. In addition, the expansion tank 100 may comprise one or more coolant inlet flow channels 160. The one or more coolant inlets 111 may be connected to the centrifugal separator 116 via the at least one coolant inlet flow channel 160. The at least one coolant inlet flow channel 160 may extend at least partially in a horizontal direction. In one example, the at least one coolant inlet flow channel 160 may extend in a horizontal direction.

[0046] Accordingly, the expansion tank 100 includes one or more coolant inlets 111, one or more coolant inlet flow channels 160 that connect the one or more coolant inlets 111 to a centrifugal separator 116 connected to one or more coolant outlets 112. Advantageously, the coolant flows from the at least one thermally managed component 2 via the coolant line 14, into one or more coolant inlets 111, whereafter it travels to the centrifugal separator 116, via the one or more coolant inlet flow channels 160, whereat the coolant is degassed. After the coolant is degassed, the coolant exits the expansion tank 100 via the one or more coolant outlets 112 and returns to the coolant line 114.

[0047] Within the scope of the present embodiment, the one or more coolant outlets 112 may be arranged vertically below the one or more coolant inlets 111, as illustrated, so that the coolant flows downward as it passes through the centrifugal separator 116 from the one or more cooling inlets 111 to one or more cooling outlets 112 whereby the expansion tank 100 is a gravity-based expansion tank 100. The one or more coolant inlets 111 may be arranged at a top portion 110A of the expansion tank 100 and the one or more coolant outlets 112 may be arranged a bottom portion 110B of the expansion tank 100.

[0048] Although the one or more coolant inlets 111 may directly connect to the centrifugal separator 116 in alternative embodiments, the one or more coolant inlets 111 may also be connected to the centrifugal separator 116 via the at least one coolant inlet flow channel 160, as shown. Additionally, the one or more cooling inlets 111 may lead to a inlet chamber 198 internal to the expansion tank 160, and at least one coolant inlet flow channel 160 may extend from the inlet chamber 198 to the centrifugal separator 116. Within the scope of the present embodiment, the coolant inlet flow channel 160 may extend at least partially in a horizontal direction. The expansion tank 100 is provided with one or more coolant outlets 112. In alternative embodiments, the coolant outlet 112 may be directly connected to the lower end of the centrifugal separator 116 and then connect directly to the coolant line 14, however, in the presently illustrated embodiment shown, a centrifugal separator fluid outlet 113 , extending from the outlet portion 1155 of the centrifugal separator 116, leads to a degassed fluid holding chamber 199 located in the expansion tank 100, external to the centrifugal separator 116, and the coolant outlet 112 extends from the degassed fluid holding chamber 199 and connects to coolant line 14. In yet another alternative embodiment shown in FIG. 2C, a coolant outlet flow channel 196 may extend from centrifugal separator fluid outlet 113 to the coolant outlet 112. Accordingly, the centrifugal separator 116 may comprise one or more centrifugal separator fluid outlets 113. The one or more centrifugal separator fluid outlets 113 may extend radially outward from the outlet portion 1155 of the centrifugal separator 116.

[0049] Advantageously, the coolant is directed into the centrifugal separator 116 so that it spins, creating a vortex that effectively separates air and gases from the coolant, e.g. the coolant liquid, as the coolant spins and descends within the centrifugal separator 116. The degassed coolant then exits the centrifugal separator 116 through the one or more coolant outlets 112 positioned below the one or more coolant inlet(s) 111, ensuring a smooth flow through vehicle's cooling system 10.

[0050] The expansion tank 100 shown is provided with at least one gas outlet 171 for venting gas removed from the coolant by the centrifugal separator 116. The gas outlet 171 may extend radially outward with respect to the centrifugal separator 116.

[0051] Turning now to FIGS. 3-9, which show a detailed view of an expansion tank 100 embodying features of the embodiment shown in FIG. 2A-C, in the depicted embodiment, the expansion tank 100 comprises a casing 140. The casing 140 of the expansion tank 100 may be configured to accommodate any internal components of the expansion tank 100. Preferably, the casing 140 may be made from materials desirably resistant to thermal and chemical stress, to enhance longevity and reliability under various operating conditions.

[0052] In one example, the one or more coolant inlets 111 and / or the one or more coolant outlets 112 may be molded into the casing 140. This may allow for ensuring secure connections with the coolant line 14. In one example, the casing 140 may incorporate features such as mounting brackets or tabs to simplify installation and provide stability.

[0053] The casing of the expansion tank 100 may be constructed from a variety of materials such as polymeric materials, for example polypropylene or polyethylene, or metals, for example aluminum or steel, e.g. stainless steel. Polypropylene (PP) may be selected due to its lightweight nature and resistance to corrosion. Alternatively, aluminum may be used for its thermal conductivity and durability, particularly in high-performance vehicles. Alternatively, Polyethylene (PE) may be used due to its chemical resistance and flexibility which may handle a wide range of temperatures. Stainless steel may be selected due to providing robust structural integrity and being generally capable of withstanding high temperatures and pressures, suitable for demanding applications.

[0054] Although FIGS 3-9 show one possible example, in alternative embodiments, the casing 140 can be alternative shapes, including, but not limited to cylindrical, rectangular, irregular or oval. A cylindrical shape may be positive in terms of achieving volume while minimizing surface area to support efficient degassing. A rectangular shape may allow for easy integration into confined spaces for example within the engine compartment of a vehicle. For specific vehicle architectures, an irregular or custom shape may also be utilized as such a shape may be adapted in accordance with the available space with a substantially maintained performance. An oval design may allow for a balance capacity and compactness.

[0055] Further referencing FIG. 3, the expansion tank 100 shown includes a gas inlet 141 and / or a gas outlet 142. The gas inlet 141 and the gas outlet 142 may serve to manage the internal pressure within the expansion tank 100. The gas outlet 141 may be configured to reduce air pressure within the expansion tank 100, such as for example, as the coolant expands when heated, and to accommodate the venting of gases, e.g. gases separated from the coolant by means of the centrifugal separator 115. The gas inlet 142 may be configured to accommodate the introduction of pressurized gas into the expansion tank. Introducing and releasing pressure may be performed to help maintain a constant pressure or optimal pressure within the expansion tank 100.

[0056] As shown in the depicted example, the casing 140 comprises a top casing part 140A and a bottom casing part 140B. The top casing part 140A and the bottom casing part 140B may be joined together to form the casing 140.

[0057] The gas inlet and outlet 141, 142 may be located in the top casing part 140A, as shown. The top casing part 140A may also be provided with one or more coolant inlets 111, such as first and second cooling inlets 111A, 111B. As illustrated, the coolant inlets 111A, 111B may be in fluid communication with the interior of the casing 140. The first coolant inlet 111A and the second coolant inlet 111B may be arranged adjacent to each other, as shown. Additionally, as shown, the first coolant inlet 111A and the second coolant inlet 111B may be arranged parallel to each other.

[0058] Turning now to FIG. 4, which shows a perspective view of a bottom side of the top casing part 140A of the expansion tank 100, e.g. an inner top side of the interior of the casing 140 of the expansion tank 100, channels 160A, 160B may be integrally formed in the expansion tank 100. In the depicted example, the first coolant inlet 111 is connected to the centrifugal separator 116 via a first coolant inlet flow channel 160A and the second coolant inlet 112 is connected to the centrifugal separator 116 via a second coolant inlet flow channel 160B. As shown, in the present illustrated embodiment, top half of the first and second channels 160A and 160B may be located on the upper casing part 140A and the bottom half may be located on the lower casing part 140B, as shown in FIG. 5, so that when the top casing part 140A and bottom casing part 140B are joined together to form the casing 140 coolant inlet flow channels 160A and 160B are defined with the expansion tank 100.

[0059] The coolant inlet flow channels 160A, 160B may extend at least partially horizontally inside the interior of the expansion tank 100, e.g. inside the casing 140. As shown, a baffle wall 181 may be integrated into the casing 140 and the coolant inlet flow channel 160B may located at least partially therein. Although in the embodiment illustrated in FIG 4, the first and second coolant inlet flow channels 160A, 160B follow different routes to the centrifugal separator, in alternative embodiments, the first and second coolant inlet flow channels 160A, 160B may extend parallel to each other. In one example, the first coolant inlet flow channel 160A and the second coolant inlet flow channel 160B may each be integrally formed in a baffle wall 181.

[0060] As shown in FIGS 4 and 5, the centrifugal separator 116 includes an inlet portion 1151 for receiving coolant from the one or more coolant inlets 111 or coolant inlet flow channels 160A, 160B. The centrifugal separator 116 also includes an outlet portion 1155 The inlet portion 1151 is located axially above the outlet portion 1155. The outlet portion 1155, which will be described in further detail with reference to FIG. 6, may comprise one or more centrifugal separator fluid outlets 113A, 113B for passing the coolant to the one or more coolant outlets 112. The inlet portion 1151 may be arranged vertically above a horizontal central plane of the expansion tank 100. The outlet portion 1155 may be arranged vertically below a horizontal central plane of the expansion tank 100. Located between the inlet portion 1151 and the outlet portion 1155 at the horizontal central plane of the expansion tank 100 is a degassing portion 1159 where the coolant swirls as degassing occurs.

[0061] The centrifugal separator 116 comprises a cavity that extends vertically within the expansion tank defined by a rounded outer wall 1161, e.g. a cylindrical outer wall 1161. According to aspects of embodiments, the one or more coolant inlets 111 or coolant inlet flow channels 160A, 160B may be adapted to direct the coolant towards the rounded outer wall 1161 such that the inertia of the coolant causes the coolant to move around the rounded outer wall 1161 in a vortex such that the pressure of the coolant causes the gas to move toward a center of the centrifugal separator. The one or more coolant inlets 111 or coolant inlet flow channels 160A, 160B preferably terminate in a manner whereby they extend substantially tangentially to the rounded outer wall 1161. Accordingly, the inertia of the coolant will cause the liquid to press against the rounded outer wall 1161 while the gas will move towards a longitudinal center axis, preferably vertical center axis, of the centrifugal separator 116. Thereby, the gas is separated from the liquid. Upon separation, the gas may rise and exit through the one or more gas outlets 171.

[0062] Additionally, the rounded outer wall 1161 may be provided with helical guiding vanes 1163 extending in a spiral pattern around the longitudinal center axis, e.g. vertical center axis at a downward angle. Thereby, the coolant is guided towards the bottom of the centrifugal separator 116. The guiding vanes 1163 may cause a centrifugal flow downwards around the longitudinal center axis. Thereby, the centrifugal forces may be further intensified, allowing for a more efficient separation of the gas from the liquid. Alternatively, radial vanes may be positioned around the centrifugal separator 116 to direct the coolant outward, maximizing contact with the rounded outer wall 1161 and improving separation. Such radial vanes may extend as annular flanges protruding radially and inwardly from the rounded outer wall 1161 towards the longitudinal center axis. The radial vanes may be arranged at set distances from each other along the longitudinal center axis. It is noted however, that it may be envisioned that the rounded outer wall 1161 may be provided as a smooth wall, e.g. without any guiding vanes.

[0063] The difference in density between the gas and the coolant causes the gas to flow upwards towards the one or more gas outlets 171. The one or more gas outlet 171 may extend radially outward relative to the centrifugal separator 115 and be in fluid communication with a gas chamber 1157 of the expansion tank 100, external to the centrifugal separator 116. For venting the gas removed from the coolant in the centrifugal chamber 116, the gas outlet 171 may be provided with a first end 171A extending from the inlet portion 1151 of the centrifugal separator and a second end 171B extending from the gas chamber 1157. In FIG. 4, the gas outlet 171 may extend through the rounded outer wall 1161. According to embodiments of the present disclosure, the first end 171A may be located above the coolant inlets 111 or coolant inlet flow channels 160A, 160B in the inlet portion 1151, so that as the coolant spirals downward it is less likely to enter the gas outlet 171.

[0064] The gas outlet 171 may include a gas outlet flow channel 171C that extends from the first end 171A to the second end 171B. The gas outlet flow channel 171C is depicted as a dotted line in FIG. 4. As shown, the first end 171A opens towards the inlet portion 1151 and the second end 171B opens into the gas chamber 1157 of the expansion tank 100, external to the centrifugal separator 116. As shown, at least a portion of the gas chamber 1157 may extend or be located downward relative to the first end 171A. Advantageously, the gas released from the coolant may flow upwards towards the upper end of the inlet portion 1151 after it is removed from the coolant that is flowing downward towards the outlet portion 1155. Then, the gas released from the coolant will travel at least partially horizontally and radially outward through gas outlet flow channel 171C, and then downward through the second end 171B. Next, the gas will flow downward through the gas chamber 1157.

[0065] Whereas the gas flows upwards within the centrifugal separator 116, upon the coolant, e.g. the degassed coolant, reaching lower the outlet portion 1155, the fluid outlets 113A, 113B may be oriented to extend in a radial direction so that the coolant may flow out of the centrifugal chamber 116 in a radial direction relative to the longitudinal center axis, e.g. vertical center axis C, or, alternatively, to face substantially tangentially relative to the rounded outer wall 1161 so that the coolant may flow out of the centrifugal chamber 116 in a tangential direction relative to the rounded outer wall 1161, whereafter it may be held within the degassed fluid holding chamber 199 of the expansion tank before being return to the coolant line 14 via one or more coolant outlets 112.

[0066] Further referencing FIG. 4, the inlet portion 1151 may be provided with inlet guiding vanes 1152 for preventing upward flow of the coolant at the inlet portion 1151. In the depicted example, the inlet guiding vanes 1152 may be provided as helical guiding vanes. The inlet guiding vanes 1152 may be arranged as a part of the guiding vanes 1163 or separately. The inlet guiding vanes 1152 may be configured to be arranged at the inlet portion 1151. The inlet guiding vanes 1152 may be configured to be arranged directly downstream of the one or more coolant inlet channels 160. The inlet guiding vanes 1152 may guide the coolant flowing from the one or more coolant inlet channels 160 downwards from the inlet portion 1151. In one example, the inlet guiding vanes 1152 may have a downward facing orientation for guiding the coolant downwards towards the outlet portion 1155.

[0067] In the depicted example, the centrifugal chamber 116 is formed by the inside of the casing 140, e.g. the interior of the casing 140. It may however be envisioned that the centrifugal separator 116 is mounted to the inside or an outside, such as a bottom side, of the casing 140, e.g. the exterior bottom side of the casing 140.

[0068] In FIG. 4 both the one or more coolant inlet 111 and the one or more coolant outlet 112 are visible. Advantageously, the one or more coolant inlet 111 and the one or more coolant outlets 112 may be arranged on the same side of a first vertical central plane V1 of the expansion tank 100.

[0069] The arrangement of the coolant inlet and outlets on the same side of a first vertical central plane within the expansion tank offers several advantages. By aligning these components, the coolant's path through the expansion tank 100 may be shortened, minimizing resistance and turbulence. This configuration may reduce the distance the coolant must travel, allowing for quicker transit through the system. This may not only enhance the overall cooling performance but also contribute to rapid degassing, as the coolant can swiftly reach and pass through the centrifugal separator 116. Additionally, this design can lead to a more compact and space-efficient tank, which is particularly beneficial in modern vehicles where space is limited. Overall, this arrangement may improve fluid dynamics within the expansion tank, improving the efficiency and reliability of the vehicle's cooling system.

[0070] The above may apply for both directions. Hence, the one or more coolant inlets 111 and the one or more coolant outlets 112 may be arranged on the same side of a second vertical central plane V2 of the expansion tank 100. The second vertical central plane V2 may be orthogonal to the first vertical central plane V1.

[0071] Moreover, the one or more coolant inlets 111 and the one or more coolant outlets 112 may be arranged in the same delimited vertically extending space, delimited horizontally by the first vertical central plane V1 and the second vertical central plane V2.

[0072] The centrifugal separator 116 may also be arranged on the same side of the first vertical central plane V1 and preferably on the same side of the second vertical central plane V2 as the one or more coolant inlet 111 and the one or more coolant outlet 112.

[0073] FIG. 7 depicts the bottom side of the bottom portion of the expansion tank 100 of FIG. 5-6. As depicted, the outlet 112 may extend at a downward angle from the fluid holding chamber 199 in the casing 140 of the expansion tank 100. The outlet 112 may be configured to be connected to, e.g. to be in fluid communication with the coolant line 14.

[0074] Further referencing FIG. 7, the expansion tank 100 may comprise a mounting bracket 144. The mounting bracket 144 may be configured to be mounted to a chassis of the vehicle 1 for mounting of the expansion tank 100. The mounting bracket 144 may be provided on the bottom portion of the expansion tank 100. In the depicted example, the bracket 144 may form an integral part of the casing 140.

[0075] FIG. 8 depicts a cross-section of the bottom portion of the expansion tank 100.

[0076] The outlet portion 1155 may be arranged vertically below the horizontal central plane H of the expansion tank 10, as shown in FIG. 8. The inlet portion 1151 may be arranged vertically above the horizontal central plane H of the expansion tank 10..

[0077] In order to facilitate rapid flow of the coolant as well as efficient degassing, the horizontal distance between the coolant inlets 111 and the vertical center axis C of the centrifugal separator 116 should preferably be as small as possible. The horizontal distance may advantageously correspond to less than 30% and preferably less than 20% of the total expansion tank 100 in a direction parallel to the horizontal distance. Accordingly, the ratio between the horizontal distance and the total horizontal distance of the expansion tank 100 should preferably be 0.3 and more preferably 0.2.

[0078] FIG. 8 further depicts the center axis C of the centrifugal separator 116. As depicted, the center axis C may extend vertically. In the depicted example, the guiding vanes 1163 may extend in a helix around said center axis C.

[0079] According to an aspect an expansion tank, vehicle cooling system and vehicle in accordance with any of the following examples may be provided.

[0080] Example 1: Expansion tank (100) for a vehicle cooling system (10) for storing a coolant for distribution in the vehicle cooling system (10), the expansion tank (100) comprising: one or more coolant inlets (111) for receiving the coolant from a coolant line (14) of the vehicle cooling system (10), one or more coolant outlets (112) for returning the coolant to the coolant line (14) of the vehicle cooling system (10), the one or more coolant outlets (112) being arranged vertically below the one or more coolant inlets (111), and a centrifugal separator (116) adapted to degas the coolant, the centrifugal separator (116) being arranged at least partially vertically below the one or more coolant inlets (111) and located between the one or more coolant inlets (111) and the one or more coolant outlets (112).

[0081] Example 2: Expansion tank (100) of Example 1, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a first vertical central plane (V1) of the expansion tank (100).

[0082] Example 3: Expansion tank (100) of Example 2, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a second vertical central plane (V2) of the expansion tank (100), the second vertical central plane (V2) being orthogonal to the first vertical central plane (V1).

[0083] Example 4: Expansion tank (100) of any of Examples 1-3, wherein the horizontal distance between a vertical center axis (C) of the centrifugal separator (116) and the one or more coolant inlets (111) corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank (100) in a direction parallel to said horizontal distance.

[0084] Example 5: Expansion tank (100) of any of Examples 1-4, wherein the centrifugal separator (116) is integrated into a casing (140) of the expansion tank (100).

[0085] Example 6: Expansion tank (100) of any of Examples 1-4, wherein the centrifugal separator (116) is mounted to an inside or outside of a casing (140) of the expansion tank (100).

[0086] Example 7: Expansion tank (100) of any of Examples 1-6, wherein the one or more coolant inlets (111) are connected to the centrifugal separator (116) via at least one coolant inlet flow channel (160) extending at least partially in a horizontal direction.

[0087] Example 8: Expansion tank (100) of Example 7, wherein the coolant inlet flow channel (160) is integrally formed in a baffle wall (181) of the expansion tank (100).

[0088] Example 9: Expansion tank (100) of any of Examples 1-8, wherein the centrifugal separator (116) comprises an inlet portion (1151) for receiving coolant from the one or more coolant inlets (111) and an outlet portion (1155) comprising one or more centrifugal separator fluid outlets (113) for passing the coolant to the one or more coolant outlets (112).

[0089] Example 10: Expansion tank (100) of Example 9, wherein the inlet portion (1151) is arranged vertically above a horizontal central plane (H) of the expansion tank.

[0090] Example 11: Expansion tank of Example 9 or 10, wherein the inlet portion (1151) is provided with inlet guiding vanes (1152) for preventing upward flow of the coolant at said inlet portion (1151).

[0091] Example 12: Expansion tank (100) of any of Examples 1-11, further comprising one or more gas outlet (171) for venting the removed gas from the centrifugal separator (116).

[0092] Example 13: Expansion tank (100) of Example 12, wherein the one or more gas outlet (171) extends radially outward relative to the inlet portion (1151).

[0093] Example 14: Expansion tank (100) of any of Examples 9-13, wherein the outlet portion (1155) comprises one or more centrifugal separator fluid outlets (113) extending radially from the outlet portion (1155) of the centrifugal separator (116).

[0094] Example 15: Expansion tank (100) of any of Examples 1-14, wherein the one or more coolant inlets (111) comprises a first and second coolant inlet (111) each being connected to the centrifugal separator (116)via a respective coolant inlet flow channel (160A, 160B).

[0095] Example 16: Expansion tank (100) of any of Examples 1-15, wherein the centrifugal separator (116) comprises a rounded outer wall (1161), wherein the one or more coolant inlets (111) are adapted to direct the coolant towards the rounded outer wall (1161) such that the inertia of the coolant causes the coolant to move around the rounded outer wall (1161) in a vortex such that the pressure of the coolant causes the gas to move toward a center axis of the centrifugal separator (116).

[0096] Example 17: Expansion tank (100) of Example 16, wherein the rounded outer wall (1161) is provided with guiding vanes (1163) for guiding the vortex movement of the coolant.

[0097] Example 18: Expansion tank of Example 1, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a first vertical central plane (V1) of the expansion tank (100) and the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a second vertical central plane (V2) of the expansion tank (100), the second vertical central plane (V2) being orthogonal to the first vertical central plane (V1), wherein the horizontal distance between a vertical center axis (C) of the centrifugal separator (116) and the one or more coolant inlets (111) corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank (100) in a direction parallel to said horizontal distance and the centrifugal separator (116) is integrated into a casing (140) of the expansion tank (100).

[0098] Example 19: Vehicle cooling system comprising the expansion tank (100) of any of Examples 1-18.

[0099] Example 20: Vehicle (1) comprising the vehicle cooling system (10) of Example 19.

[0100] The terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises," "comprising," "includes," and / or "including" when used herein specify the presence of stated features, integers, actions, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, actions, steps, operations, elements, components, and / or groups thereof.

[0101] It will be understood that, although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0102] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe a relationship of one element to another element as illustrated in the Figures. It will be understood that these terms and those discussed above are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

[0103] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0104] It is to be understood that the present disclosure is not limited to the aspects described above and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the present disclosure and appended claims. In the drawings and specification, there have been disclosed aspects for purposes of illustration only and not for purposes of limitation, the scope of the disclosure being set forth in the following claims.

Examples

example 7

[0086] Expansion tank (100) of any of Examples 1-6, wherein the one or more coolant inlets (111) are connected to the centrifugal separator (116) via at least one coolant inlet flow channel (160) extending at least partially in a horizontal direction.

[0087]Example 8: Expansion tank (100) of Example 7, wherein the coolant inlet flow channel (160) is integrally formed in a baffle wall (181) of the expansion tank (100).

[0088]Example 9: Expansion tank (100) of any of Examples 1-8, wherein the centrifugal separator (116) comprises an inlet portion (1151) for receiving coolant from the one or more coolant inlets (111) and an outlet portion (1155) comprising one or more centrifugal separator fluid outlets (113) for passing the coolant to the one or more coolant outlets (112).

[0089]Example 10: Expansion tank (100) of Example 9, wherein the inlet portion (1151) is arranged vertically above a horizontal central plane (H) of the expansion tank.

[0090]Example 11: Expansion tank of Example 9 or 1...

example 18

[0097] Expansion tank of Example 1, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a first vertical central plane (V1) of the expansion tank (100) and the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a second vertical central plane (V2) of the expansion tank (100), the second vertical central plane (V2) being orthogonal to the first vertical central plane (V1), wherein the horizontal distance between a vertical center axis (C) of the centrifugal separator (116) and the one or more coolant inlets (111) corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank (100) in a direction parallel to said horizontal distance and the centrifugal separator (116) is integrated into a casing (140) of the expansion tank (100).

[0098]Example 19: Vehicle cooling system comprising the expansion tank (100) of any of Examples...

Claims

1. Expansion tank (100) for a vehicle cooling system (10) for storing a coolant for distribution in the vehicle cooling system (10), the expansion tank (100) comprising: - one or more coolant inlets (111) for receiving the coolant from a coolant line (14) of the vehicle cooling system (10), - one or more coolant outlets (112) for returning the coolant to the coolant line (14) of the vehicle cooling system (10), the one or more coolant outlets (112) being arranged vertically below the one or more coolant inlets (111), and - a centrifugal separator (116) adapted to degas the coolant, the centrifugal separator (116) being at least partially arranged vertically below the one or more coolant inlets (111) and fluidly connected and located between the one or more coolant inlets (111) and the one or more coolant outlets (112).

2. Expansion tank (100) of claim 1, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a first vertical central plane (V1) of the expansion tank (100).

3. Expansion tank (100) of claim 2, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a second vertical central plane (V2) of the expansion tank (100), the second vertical central plane (V2) being orthogonal to the first vertical central plane (V1).

4. Expansion tank (100) of any of claims 1-3, wherein the centrifugal separator (116) is integrated into a casing (140) forming the expansion tank (100).

5. Expansion tank (100) of any of claims 1-4, wherein the one or more coolant inlets (111) are connected to the centrifugal separator (116) via at least one coolant inlet flow channel (160) extending at least partially in a horizontal direction.

6. Expansion tank (100) of any of claims 1-5, wherein the centrifugal separator (116) comprises an inlet portion (1151) for receiving coolant from the one or more coolant inlets (111) and an outlet portion (1155) for passing the coolant to the one or more coolant outlets (112).

7. Expansion tank (100) of claim 6, wherein the inlet portion (1151) is arranged vertically above a horizontal central plane (H) of the expansion tank (100).

8. Expansion tank of claim 6 or 7, wherein the inlet portion (1151) is provided with inlet guiding vanes (1152) for preventing upward flow of the coolant at said inlet portion (1151).

9. Expansion tank (100) of any of claims 1-8, further comprising one or more gas outlets (171) for venting the removed gas from the centrifugal separator (116).

10. Expansion tank (100) of claim 9, wherein the one or more gas outlets (171) extend radially outward with respect to the inlet portion (1151).

11. Expansion tank (100) of any of claims 6-10, wherein the centrifugal separator (116) comprises one or more centrifugal separator fluid outlets (113) extending radially outward from the outlet portion (1155) of the centrifugal separator (116).

12. Expansion tank (100) of any of claims 1-11, wherein the one or more coolant inlets (111) comprises a first and second coolant inlet (111) each being connected to the centrifugal separator (116) via a respective coolant inlet flow channel (160).

13. Expansion tank of claim 1, wherein the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a first vertical central plane (V 1) of the expansion tank (100) and the one or more coolant inlets (111) and the one or more coolant outlets (112) are arranged on the same side of a second vertical central plane (V2) of the expansion tank (100), the second vertical central plane (V2) being orthogonal to the first vertical central plane (V1), wherein the horizontal distance between a vertical center axis (C) of the centrifugal separator (116) and the one or more coolant inlets (111) corresponds to less than 30% and preferably less than 20% of the total extension of the expansion tank (100) in a direction parallel to said horizontal distance and the centrifugal separator (116) is integrated into a casing (140) of the expansion tank (100).

14. Vehicle cooling system (10) comprising the expansion tank (100) of any of claims 1-13.

15. Vehicle (1) comprising the vehicle cooling system (10) of claim 14.

Images