EP2221462A1 - Multi chamber coolant tank - Google Patents
Multi chamber coolant tank Download PDFInfo
- Publication number
- EP2221462A1 EP2221462A1 EP10250121A EP10250121A EP2221462A1 EP 2221462 A1 EP2221462 A1 EP 2221462A1 EP 10250121 A EP10250121 A EP 10250121A EP 10250121 A EP10250121 A EP 10250121A EP 2221462 A1 EP2221462 A1 EP 2221462A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reservoir
- overflow
- pressurized
- fluid
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
- F01P11/029—Expansion reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
- F01P11/0204—Filling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
- F01P11/0204—Filling
- F01P11/0209—Closure caps
- F01P11/0238—Closure caps with overpressure valves or vent valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
- F01P11/0276—Draining or purging
Definitions
- the present invention relates to coolant tanks for receiving fluid from a cooling system, such as an internal combustion engine cooling system.
- the invention provides a coolant tank for receiving a fluid from the cooling system of an internal combustion engine.
- the coolant tank includes a pressurized tank having a pressurized reservoir configured to contain the fluid, an inlet port in fluid communication with the pressurized reservoir and configured to direct fluid from the from the cooling system and into the pressurized reservoir, an outlet port in fluid communication with the pressurized reservoir and configured to direct the fluid from the pressurized reservoir to the cooling system, a fill neck in fluid communication with the pressurized reservoir, and a pressure cap removably coupled to the fill neck.
- the coolant tank also includes an overflow tank integrated with the pressurized tank.
- the overflow tank includes an overflow reservoir maintained at atmospheric pressure and configured to receive overflow fluid from the pressurized reservoir when the liquid of the cooling system expands, and at least a portion of the fill neck is positioned within the overflow reservoir.
- the pressure cap may include: a pressure limiting valve configured to release the fluid to the overflow reservoir when the pressurized reservoir reaches a first predetermined pressure; and a check valve configured to allow the fluid to flow from the overflow reservoir to the pressurized reservoir when the pressure in the pressurized reservoir drops below a second predetermined value.
- an overflow port in fluid communication with the overflow reservoir and configured to vent the fluid to the atmosphere.
- the coolant tank may further comprise a duct in fluid communication between the pressure cap and the overflow reservoir, the duct having at least a portion of a wall in common with the fill neck.
- the position of the pressure cap relative to the pressure reservoir may define an upward direction.
- the overflow reservoir may be positioned substantially above the pressurized reservoir.
- the fill neck may extend vertically from the pressurized reservoir into the overflow reservoir.
- the inlet port may be positioned near the top of the fill neck.
- the invention provides a coolant tank for receiving a fluid from the cooling system of an internal combustion engine.
- the coolant tank includes a pressurized tank having a pressurized reservoir configured to contain the fluid, an inlet port in fluid communication with the pressurized reservoir and configured to direct fluid from the from the cooling system and into the pressurized reservoir, an outlet port in fluid communication with the pressurized reservoir and configured to direct the fluid from the pressurized reservoir to the cooling system, a fill neck in fluid communication with the pressurized reservoir, and a pressure cap removably coupled to the fill neck.
- the coolant tank also includes an overflow tank integrated with the pressurized tank.
- the overflow tank includes an overflow reservoir maintained at atmospheric pressure and configured to receive overflow fluid from the pressurized chamber when the liquid of the cooling system expands, and a fill cap removably coupled to the overflow reservoir.
- the position of the fill cap relative to the overflow reservoir and the position of the pressure cap relative to the pressure reservoir define an upward direction, and at least a portion of the overflow reservoir is positioned above the pressurized reservoir.
- At least a portion of the fill neck may be substantially surrounded by the overflow reservoir.
- the pressure cap may include: a pressure limiting valve configured to release the fluid to the overflow reservoir when the pressurized reservoir reaches a first predetermined pressure; and a check valve configured to allow the fluid to flow from the overflow reservoir to the pressurized reservoir when the pressure in the pressurized reservoir drops below a second predetermined value.
- the coolant tank may further comprise an overflow port in fluid communication with the overflow reservoir and configured to vent the fluid to the atmosphere.
- the coolant tank may further comprise a duct in fluid communication between the pressure cap and the overflow reservoir.
- the duct may have at least a portion of a wall in common with the fill neck.
- the entire overflow reservoir may be positioned above the pressurized reservoir.
- the fill neck may extend vertically from the pressurized reservoir into the overflow reservoir.
- the inlet port may be positioned near the top of the fill neck.
- the invention provides a coolant tank for receiving a fluid from the cooling system of an internal combustion engine.
- the coolant tank includes an overflow tank including an overflow reservoir maintained at atmospheric pressure, and an overflow duct in fluid communication with the overflow reservoir.
- the coolant tank also includes a pressurized tank integrated with the overflow tank.
- the pressurized tank includes a pressurized reservoir configured to contain the fluid, an inlet port in fluid communication with the pressurized reservoir and configured to direct fluid from the cooling system and into the pressurized reservoir, an outlet port in fluid communication with the pressurized reservoir and configured to direct the fluid from the pressurized reservoir to the cooling system, a fill neck in fluid communication with the pressurized reservoir, and a pressure cap removably coupled to the fill neck.
- the overflow duct is integrated with the fill neck.
- the pressure cap includes a pressure limiting valve configured to allow the fluid to flow from the pressurized reservoir, through the fill neck, and through the overflow duct to the overflow reservoir when the pressurized reservoir reaches a first predetermined pressure, and a check valve configured to allow the fluid to flow from the overflow reservoir, through the overflow duct, and through the fill neck to the pressurized reservoir when the pressure in the pressurized reservoir drops below a second predetermined pressure.
- At least a portion of the fill neck may be substantially surrounded by the overflow reservoir.
- the coolant tank may further comprise an overflow port in fluid communication with the overflow reservoir and configured to vent the fluid to the atmosphere.
- the position of the pressure cap relative to the pressure reservoir may define an upward direction.
- the overflow reservoir may be positioned substantially above the pressurized reservoir.
- the inlet port may be positioned near the top of the fill neck.
- Fig. 1 is a schematic view of a cooling system and coolant tank according to the present invention.
- Fig. 2 is an exploded view of the coolant tank of Fig. 1 .
- Fig. 3 is a rear perspective view of the coolant tank of Fig. 1 .
- Fig. 4 is a cross section view taken along line 4-4 of Fig. 3 .
- Fig. 1 shows a schematic of a cooling system 10 including the coolant tank 14 according to the present invention.
- the coolant tank 14 receives a fluid from the cooling system 10, such as the cooling system of an internal combustion engine.
- Figs. 2-4 show one construction of the coolant tank 14. It is to be understood that other constructions are possible within the scope of the invention, as described herein.
- the coolant tank 14 includes a first body portion 16, a second body portion 20, and a third body portion, or divider 24, coupled between the first and second body portions.
- the body portions 16, 20 and the divider 24 are each plastic and made from a plastic-injection-molding process.
- the coolant tank 14 could be defined by a single body portion, two body portions, or more than three body portions.
- the body portions 16, 20 and the divider 24 are hotplate welded together such that they are integrated together to define the coolant tank 14. In other constructions, other welding or fastening means may be employed.
- the assembled coolant tank 14 includes a pressurized tank 36 and an overflow tank 40 integrated with each other, or formed as a single unit or piece.
- the body portions 16, 20 and divider 24 define features of the pressurized tank 36, the overflow tank 40, or both the pressurized tank 36 and overflow tank 40, the structure of the coolant tank 14 will be described with reference to its association with either the pressurized tank 36 or the overflow tank 40.
- the pressurized tank 36 includes a pressurized reservoir 18 that is in fluid communication with the cooling system 10 and is a part of the cooling system circuit.
- the pressurized tank 36 also includes a fill neck 26 in direct fluid communication with the pressurized reservoir 18, and a pressure cap 30 removably coupled to the fill neck 26, preferably by way of a threaded engagement.
- the pressure cap 30 includes a pressure limiting valve 34 and a check valve 38, best depicted in the schematic of Fig. 1 .
- the coolant tank 14 shown Fig. 1 is a schematic version of the cross section of the coolant tank 14 shown in Fig. 4 . Particularly, a cross section of the pressure cap 30 is shown schematically in Fig. 1 .
- the pressure limiting valve 34 and the check valve 38 will be described in greater detail below.
- the fill neck 26 is fluidly separated from the overflow tank 40 by the pressure limiting valve 34 when the pressure limiting valve 34 is closed.
- the fill neck 26 includes a substantially cylindrical wall that extends vertically upward from an opening 28 in the divider 24 at the top of the pressurized reservoir 18, although the fill neck 26 may be non-vertical and non-cylindrical in other constructions.
- the fill neck 26 is substantially surrounded by the overflow tank 40.
- the fill neck 26 may be integrated with a side wall of the second body portion 20, such that a portion of the fill neck 26 is surrounded by the overflow tank 40.
- the fill neck 26 is at least partially positioned within the overflow tank 40; and most preferably, the fill neck 26 is positioned substantially within the overflow tank 40.
- the pressurized tank 36 includes an inlet port 42 in fluid communication with the cooling system 10 and the pressurized reservoir 18.
- the inlet port 42 is positioned proximate the top of the fill neck 26 and provides an inlet for the inflow of fluid to the pressurized reservoir 18 from the cooling system 10.
- the inlet port 42 is positioned at or near a high point in the cooling system and, likewise, at or near the top of the pressurized tank 36 and the coolant tank 14.
- the pressurized tank 36 also includes an outlet port 46 in fluid communication with the pressurized reservoir 18 and the cooling system 10.
- the outlet port 46 is positioned proximate the bottom of the pressurized reservoir 18 and provides an outlet for the outflow of fluid from the pressurized reservoir 18 to the cooling system 10.
- the outlet port 46 is positioned low on the pressurized tank 36 to receive fluid from a low point of the pressurized reservoir 18 and to discharge fluid to the cooling system 10.
- the pressurized tank 36 includes a threaded port 48 and a float switch 52 threaded into the threaded port 48.
- the float switch 52 generates a warning signal when the fluid level in the pressurized reservoir 18 drops below the level of the float switch 52.
- the overflow tank 40 includes an overflow reservoir 22 that is maintained at atmospheric pressure and that receives fluid from the pressurized reservoir 18 when the fluid in the pressurized reservoir 18 expands, as will be described in greater detail below.
- the overflow tank 40 includes an overflow duct 50 that is in fluid communication with the overflow reservoir 22.
- the overflow duct 50 is integrated with the fill neck 26, and shares a portion of the cylindrical wall of the fill neck 26.
- the overflow duct 50 is also defined by a U-shaped channel extending out from the shared portion of the fill neck 26.
- the overflow duct 50 provides a passageway, parallel to the fill neck 26, for fluid passing from the pressurized reservoir 18 through the fill neck 26 to the overflow reservoir 22.
- the overflow duct 50 also provides a passageway for fluid passing from the overflow reservoir 22 through the overflow duct 50 to the fill neck 26 and to the pressurized reservoir 18.
- the overflow tank 40 includes an overflow port 54 positioned near the top of the overflow reservoir 22, providing fluid communication with the atmosphere to maintain the overflow reservoir 22 at atmospheric pressure.
- the overflow port 54 discharges fluid that reaches the height of the overflow port 54 within the overflow reservoir 22.
- the overflow tank 40 also includes a non-pressurized fill neck 58 and a fill cap 62 removably coupled thereto, preferably by way of a threaded engagement.
- the position of the fill cap 62 relative to the overflow reservoir 22 and the position of the pressure cap 30 relative to the pressurized reservoir 18 define an upward direction.
- the pressurized reservoir 18 is positioned entirely below the overflow reservoir 22. In other constructions, the pressurized reservoir 18 is positioned substantially below the overflow reservoir 22.
- the coolant tank 14 includes bosses 66 for receiving fasteners to secure the tank 14 within the enclosure.
- the bosses 66 are formed as a part of the pressurized tank 36; however, in other constructions, the bosses 66 may be located on any part of the tank 14.
- the coolant tank 14 is made of a transparent or semitransparent material so that the fluid level can be easily monitored, such as by markings 32 or indicia on the overflow tank 40.
- the tank 14 can be made of a non-transparent material and fluid level can be monitored using a sight glass or other suitable apparatus.
- the divider 24, the outlet port 46, and the threaded port 48 are integrally formed with or coupled to the first body portion 16.
- the divider 24, the fill neck 26, the inlet port 42, the overflow duct 50, the overflow port 54, and the non-pressurized fill neck 58 are integrally formed with or coupled to the second body portion 20.
- the coolant tank 14 de-aerates coolant and provides a compact one-piece multi-chamber structure.
- the compact multi-chamber design having the tank inlet port 42 positioned at or near the top of the coolant tank 14 is especially useful in applications where there is relatively little vertical distance between the highest point in the engine's cooling circuit (e.g., cooling system 10) and the top of the enclosure in which the engine and cooling system 10 are housed.
- coolant and air entrained within the coolant enter the pressurized reservoir 18 by way of the inlet port 42 and fill neck 26.
- Coolant collects below in the pressurized reservoir 18 and exits to the lowest point of the cooling system 10 by way of the outlet port at the bottom of the pressurized reservoir 18, as indicated by the arrows in Fig. 1 .
- the air is released through the pressure limiting valve 34 in the pressure cap 30, i.e., the pressure limiting valve 34 opens allowing fluid to pass from the pressurized reservoir 18 and the fill neck 26, through the pressure limiting valve 34, and through the overflow duct 50 to the bottom of the overflow reservoir 22 as indicated by arrows in Fig. 1 . Since the overflow reservoir 22 is open to the atmosphere, the air is purged from the system by way of the open overflow port 54, also indicated by an arrow in Fig. 1 .
- the overflow reservoir 22 contains additional coolant, which can be added by way of the non-pressurized fill neck 58 when the fill cap 62 is removed.
- the coolant cools and contracts creating a vacuum in the cooling system 10.
- the check valve 38 opens allowing fluid to pass from the overflow reservoir 22 through the overflow duct 50 to the fill neck 26 and to the pressurized reservoir 18, as indicated by arrows in Fig. 1 .
- the cooling system 10 can also be filled by way of the fill neck 26 when the system 10 is shut down.
- the pressure cap 30 can be removed and coolant can be added directly to the pressurized reservoir 18 by way of the fill neck 26. This is useful, for example, during the initial fill, when extreme low fluid is detected (e.g., when the float switch is tripped), and when the coolant is replaced for maintenance.
- the invention provides, among other things, a compact multi-chamber coolant tank.
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Abstract
A coolant tank for receiving a fluid from the cooling system of an internal combustion engine includes a pressurized tank having a pressurized reservoir configured to contain the fluid and an overflow tank integrated with the pressurized tank. The pressurized reservoir includes an inlet port configured to receive the fluid from the cooling system, an outlet port configured to direct the fluid from the pressurized reservoir to the cooling system, a fill neck in fluid communication with the pressurized reservoir, and a pressure cap removably coupled to the fill neck. The overflow tank includes an overflow reservoir maintained at atmospheric pressure and configured to receive overflow fluid from the pressurized reservoir when the liquid of the cooling system expands. At least a portion of the fill neck is positioned within the overflow reservoir.
Description
- The present invention relates to coolant tanks for receiving fluid from a cooling system, such as an internal combustion engine cooling system.
- In one aspect, the invention provides a coolant tank for receiving a fluid from the cooling system of an internal combustion engine. The coolant tank includes a pressurized tank having a pressurized reservoir configured to contain the fluid, an inlet port in fluid communication with the pressurized reservoir and configured to direct fluid from the from the cooling system and into the pressurized reservoir, an outlet port in fluid communication with the pressurized reservoir and configured to direct the fluid from the pressurized reservoir to the cooling system, a fill neck in fluid communication with the pressurized reservoir, and a pressure cap removably coupled to the fill neck. The coolant tank also includes an overflow tank integrated with the pressurized tank. The overflow tank includes an overflow reservoir maintained at atmospheric pressure and configured to receive overflow fluid from the pressurized reservoir when the liquid of the cooling system expands, and at least a portion of the fill neck is positioned within the overflow reservoir.
- The pressure cap may include: a pressure limiting valve configured to release the fluid to the overflow reservoir when the pressurized reservoir reaches a first predetermined pressure; and a check valve configured to allow the fluid to flow from the overflow reservoir to the pressurized reservoir when the pressure in the pressurized reservoir drops below a second predetermined value.
- There may be provided an overflow port in fluid communication with the overflow reservoir and configured to vent the fluid to the atmosphere.
- The coolant tank may further comprise a duct in fluid communication between the pressure cap and the overflow reservoir, the duct having at least a portion of a wall in common with the fill neck.
- The position of the pressure cap relative to the pressure reservoir may define an upward direction.
- The overflow reservoir may be positioned substantially above the pressurized reservoir.
- The fill neck may extend vertically from the pressurized reservoir into the overflow reservoir.
- The inlet port may be positioned near the top of the fill neck.
- In another aspect the invention provides a coolant tank for receiving a fluid from the cooling system of an internal combustion engine. The coolant tank includes a pressurized tank having a pressurized reservoir configured to contain the fluid, an inlet port in fluid communication with the pressurized reservoir and configured to direct fluid from the from the cooling system and into the pressurized reservoir, an outlet port in fluid communication with the pressurized reservoir and configured to direct the fluid from the pressurized reservoir to the cooling system, a fill neck in fluid communication with the pressurized reservoir, and a pressure cap removably coupled to the fill neck. The coolant tank also includes an overflow tank integrated with the pressurized tank. The overflow tank includes an overflow reservoir maintained at atmospheric pressure and configured to receive overflow fluid from the pressurized chamber when the liquid of the cooling system expands, and a fill cap removably coupled to the overflow reservoir. The position of the fill cap relative to the overflow reservoir and the position of the pressure cap relative to the pressure reservoir define an upward direction, and at least a portion of the overflow reservoir is positioned above the pressurized reservoir.
- At least a portion of the fill neck may be substantially surrounded by the overflow reservoir.
- The pressure cap may include: a pressure limiting valve configured to release the fluid to the overflow reservoir when the pressurized reservoir reaches a first predetermined pressure; and a check valve configured to allow the fluid to flow from the overflow reservoir to the pressurized reservoir when the pressure in the pressurized reservoir drops below a second predetermined value.
- The coolant tank may further comprise an overflow port in fluid communication with the overflow reservoir and configured to vent the fluid to the atmosphere.
- The coolant tank may further comprise a duct in fluid communication between the pressure cap and the overflow reservoir.
- The duct may have at least a portion of a wall in common with the fill neck.
- The entire overflow reservoir may be positioned above the pressurized reservoir.
- The fill neck may extend vertically from the pressurized reservoir into the overflow reservoir.
- The inlet port may be positioned near the top of the fill neck.
- In another aspect the invention provides a coolant tank for receiving a fluid from the cooling system of an internal combustion engine. The coolant tank includes an overflow tank including an overflow reservoir maintained at atmospheric pressure, and an overflow duct in fluid communication with the overflow reservoir. The coolant tank also includes a pressurized tank integrated with the overflow tank. The pressurized tank includes a pressurized reservoir configured to contain the fluid, an inlet port in fluid communication with the pressurized reservoir and configured to direct fluid from the cooling system and into the pressurized reservoir, an outlet port in fluid communication with the pressurized reservoir and configured to direct the fluid from the pressurized reservoir to the cooling system, a fill neck in fluid communication with the pressurized reservoir, and a pressure cap removably coupled to the fill neck. The overflow duct is integrated with the fill neck. The pressure cap includes a pressure limiting valve configured to allow the fluid to flow from the pressurized reservoir, through the fill neck, and through the overflow duct to the overflow reservoir when the pressurized reservoir reaches a first predetermined pressure, and a check valve configured to allow the fluid to flow from the overflow reservoir, through the overflow duct, and through the fill neck to the pressurized reservoir when the pressure in the pressurized reservoir drops below a second predetermined pressure.
- At least a portion of the fill neck may be substantially surrounded by the overflow reservoir.
- The coolant tank may further comprise an overflow port in fluid communication with the overflow reservoir and configured to vent the fluid to the atmosphere.
- The position of the pressure cap relative to the pressure reservoir may define an upward direction.
- The overflow reservoir may be positioned substantially above the pressurized reservoir.
- The inlet port may be positioned near the top of the fill neck.
- Other aspects of the invention will become apparent by consideration of the detailed description and accompanying drawings.
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Fig. 1 is a schematic view of a cooling system and coolant tank according to the present invention. -
Fig. 2 is an exploded view of the coolant tank ofFig. 1 . -
Fig. 3 is a rear perspective view of the coolant tank ofFig. 1 . -
Fig. 4 is a cross section view taken along line 4-4 ofFig. 3 . - Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms "mounted," "connected," "supported," and "coupled" and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings.
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Fig. 1 shows a schematic of acooling system 10 including thecoolant tank 14 according to the present invention. Thecoolant tank 14 receives a fluid from thecooling system 10, such as the cooling system of an internal combustion engine. -
Figs. 2-4 show one construction of thecoolant tank 14. It is to be understood that other constructions are possible within the scope of the invention, as described herein. With further reference toFig. 2 , thecoolant tank 14 includes afirst body portion 16, asecond body portion 20, and a third body portion, ordivider 24, coupled between the first and second body portions. In the illustrated construction, thebody portions divider 24 are each plastic and made from a plastic-injection-molding process. In other constructions, thecoolant tank 14 could be defined by a single body portion, two body portions, or more than three body portions. - In the illustrated construction, the
body portions divider 24 are hotplate welded together such that they are integrated together to define thecoolant tank 14. In other constructions, other welding or fastening means may be employed. The assembledcoolant tank 14 includes apressurized tank 36 and anoverflow tank 40 integrated with each other, or formed as a single unit or piece. Although thebody portions divider 24 define features of the pressurizedtank 36, theoverflow tank 40, or both the pressurizedtank 36 andoverflow tank 40, the structure of thecoolant tank 14 will be described with reference to its association with either the pressurizedtank 36 or theoverflow tank 40. - The pressurized
tank 36 includes a pressurizedreservoir 18 that is in fluid communication with thecooling system 10 and is a part of the cooling system circuit. The pressurizedtank 36 also includes afill neck 26 in direct fluid communication with the pressurizedreservoir 18, and apressure cap 30 removably coupled to thefill neck 26, preferably by way of a threaded engagement. Thepressure cap 30 includes apressure limiting valve 34 and acheck valve 38, best depicted in the schematic ofFig. 1 . Thecoolant tank 14 shownFig. 1 is a schematic version of the cross section of thecoolant tank 14 shown inFig. 4 . Particularly, a cross section of thepressure cap 30 is shown schematically inFig. 1 . Thepressure limiting valve 34 and thecheck valve 38 will be described in greater detail below. - The
fill neck 26 is fluidly separated from theoverflow tank 40 by thepressure limiting valve 34 when thepressure limiting valve 34 is closed. Thefill neck 26 includes a substantially cylindrical wall that extends vertically upward from anopening 28 in thedivider 24 at the top of thepressurized reservoir 18, although thefill neck 26 may be non-vertical and non-cylindrical in other constructions. Thefill neck 26 is substantially surrounded by theoverflow tank 40. In other constructions, thefill neck 26 may be integrated with a side wall of thesecond body portion 20, such that a portion of thefill neck 26 is surrounded by theoverflow tank 40. In preferred embodiments, thefill neck 26 is at least partially positioned within theoverflow tank 40; and most preferably, thefill neck 26 is positioned substantially within theoverflow tank 40. - The
pressurized tank 36 includes aninlet port 42 in fluid communication with thecooling system 10 and thepressurized reservoir 18. Theinlet port 42 is positioned proximate the top of thefill neck 26 and provides an inlet for the inflow of fluid to thepressurized reservoir 18 from thecooling system 10. Theinlet port 42 is positioned at or near a high point in the cooling system and, likewise, at or near the top of thepressurized tank 36 and thecoolant tank 14. Thepressurized tank 36 also includes anoutlet port 46 in fluid communication with thepressurized reservoir 18 and thecooling system 10. Theoutlet port 46 is positioned proximate the bottom of thepressurized reservoir 18 and provides an outlet for the outflow of fluid from thepressurized reservoir 18 to thecooling system 10. Theoutlet port 46 is positioned low on thepressurized tank 36 to receive fluid from a low point of thepressurized reservoir 18 and to discharge fluid to thecooling system 10. - The
pressurized tank 36 includes a threadedport 48 and afloat switch 52 threaded into the threadedport 48. Thefloat switch 52 generates a warning signal when the fluid level in thepressurized reservoir 18 drops below the level of thefloat switch 52. - The
overflow tank 40 includes anoverflow reservoir 22 that is maintained at atmospheric pressure and that receives fluid from thepressurized reservoir 18 when the fluid in thepressurized reservoir 18 expands, as will be described in greater detail below. Theoverflow tank 40 includes anoverflow duct 50 that is in fluid communication with theoverflow reservoir 22. Theoverflow duct 50 is integrated with thefill neck 26, and shares a portion of the cylindrical wall of thefill neck 26. Theoverflow duct 50 is also defined by a U-shaped channel extending out from the shared portion of thefill neck 26. Theoverflow duct 50 provides a passageway, parallel to thefill neck 26, for fluid passing from thepressurized reservoir 18 through thefill neck 26 to theoverflow reservoir 22. Theoverflow duct 50 also provides a passageway for fluid passing from theoverflow reservoir 22 through theoverflow duct 50 to thefill neck 26 and to thepressurized reservoir 18. - The
overflow tank 40 includes anoverflow port 54 positioned near the top of theoverflow reservoir 22, providing fluid communication with the atmosphere to maintain theoverflow reservoir 22 at atmospheric pressure. In addition, theoverflow port 54 discharges fluid that reaches the height of theoverflow port 54 within theoverflow reservoir 22. Theoverflow tank 40 also includes anon-pressurized fill neck 58 and afill cap 62 removably coupled thereto, preferably by way of a threaded engagement. - The position of the
fill cap 62 relative to theoverflow reservoir 22 and the position of thepressure cap 30 relative to thepressurized reservoir 18 define an upward direction. Thepressurized reservoir 18 is positioned entirely below theoverflow reservoir 22. In other constructions, thepressurized reservoir 18 is positioned substantially below theoverflow reservoir 22. - With reference to
Fig. 3 , thecoolant tank 14 includesbosses 66 for receiving fasteners to secure thetank 14 within the enclosure. In the illustrated construction, thebosses 66 are formed as a part of thepressurized tank 36; however, in other constructions, thebosses 66 may be located on any part of thetank 14. - In the illustrated construction, the
coolant tank 14 is made of a transparent or semitransparent material so that the fluid level can be easily monitored, such as bymarkings 32 or indicia on theoverflow tank 40. In other constructions, thetank 14 can be made of a non-transparent material and fluid level can be monitored using a sight glass or other suitable apparatus. - With reference to
Fig. 2 , thedivider 24, theoutlet port 46, and the threadedport 48 are integrally formed with or coupled to thefirst body portion 16. Thedivider 24, thefill neck 26, theinlet port 42, theoverflow duct 50, theoverflow port 54, and thenon-pressurized fill neck 58 are integrally formed with or coupled to thesecond body portion 20. - In operation, the
coolant tank 14 de-aerates coolant and provides a compact one-piece multi-chamber structure. The compact multi-chamber design having thetank inlet port 42 positioned at or near the top of thecoolant tank 14 is especially useful in applications where there is relatively little vertical distance between the highest point in the engine's cooling circuit (e.g., cooling system 10) and the top of the enclosure in which the engine andcooling system 10 are housed. As illustrated by the arrows inFig. 1 andFig. 4 , coolant and air entrained within the coolant enter thepressurized reservoir 18 by way of theinlet port 42 and fillneck 26. This reduces the velocity of the coolant such that air separates from the coolant and collects at the top of thefill neck 26, which is a high point in thecooling system 10. Coolant collects below in thepressurized reservoir 18 and exits to the lowest point of thecooling system 10 by way of the outlet port at the bottom of thepressurized reservoir 18, as indicated by the arrows inFig. 1 . When thecooling system 10 increases in temperature and pressure and reaches a first predetermined pressure, the air is released through thepressure limiting valve 34 in thepressure cap 30, i.e., thepressure limiting valve 34 opens allowing fluid to pass from thepressurized reservoir 18 and thefill neck 26, through thepressure limiting valve 34, and through theoverflow duct 50 to the bottom of theoverflow reservoir 22 as indicated by arrows inFig. 1 . Since theoverflow reservoir 22 is open to the atmosphere, the air is purged from the system by way of theopen overflow port 54, also indicated by an arrow inFig. 1 . - The
overflow reservoir 22 contains additional coolant, which can be added by way of thenon-pressurized fill neck 58 when thefill cap 62 is removed. When thecooling system 10 is turned off, the coolant cools and contracts creating a vacuum in thecooling system 10. When the pressure in thepressurized reservoir 18 drops below a second predetermined pressure, thecheck valve 38 opens allowing fluid to pass from theoverflow reservoir 22 through theoverflow duct 50 to thefill neck 26 and to thepressurized reservoir 18, as indicated by arrows inFig. 1 . - The
cooling system 10 can also be filled by way of thefill neck 26 when thesystem 10 is shut down. When thecooling system 10 is shut down, thepressure cap 30 can be removed and coolant can be added directly to thepressurized reservoir 18 by way of thefill neck 26. This is useful, for example, during the initial fill, when extreme low fluid is detected (e.g., when the float switch is tripped), and when the coolant is replaced for maintenance. - Thus, the invention provides, among other things, a compact multi-chamber coolant tank. Various features and advantages of the invention are set forth in the following claims.
Claims (15)
- A coolant tank for receiving a fluid from the cooling system of an internal combustion engine, comprising:a pressurized tank includinga pressurized reservoir configured to contain the fluid,an inlet port in fluid communication with the pressurized reservoir and configured to direct fluid from the from the cooling system and into the pressurized reservoir,an outlet port in fluid communication with the pressurized reservoir and configured to direct the fluid from the pressurized reservoir to the cooling system,a fill neck in fluid communication with the pressurized reservoir, anda pressure cap removably coupled to the fill neck; andan overflow tank integrated with the pressurized tank, the overflow tank including an overflow reservoir maintained at atmospheric pressure and configured to receive overflow fluid from the pressurized reservoir when the liquid of the cooling system expands, andwherein at least a portion of the fill neck is positioned within the overflow reservoir.
- The coolant tank of claim 1, wherein the position of the pressure cap relative to the pressure reservoir defines an upward direction, and wherein the overflow reservoir is positioned substantially above the pressurized reservoir.
- A coolant tank for receiving a fluid from the cooling system of an internal combustion engine, comprising:a pressurized tank includinga pressurized reservoir configured to contain the fluid,an inlet port in fluid communication with the pressurized reservoir and configured to direct fluid from the from the cooling system and into the pressurized reservoir,an outlet port in fluid communication with the pressurized reservoir and configured to direct the fluid from the pressurized reservoir to the cooling system,a fill neck in fluid communication with the pressurized reservoir, anda pressure cap removably coupled to the fill neck; andan overflow tank integrated with the pressurized tank, the overflow tank including an overflow reservoir maintained at atmospheric pressure and configured to receive overflow fluid from the pressurized chamber when the liquid of the cooling system expands, anda fill cap removably coupled to the overflow reservoir, wherein the position of the fill cap relative to the overflow reservoir and the position of the pressure cap relative to the pressure reservoir define an upward direction,wherein at least a portion of the overflow reservoir is positioned above the pressurized reservoir.
- The coolant tank of claim 3, wherein at least a portion of the fill neck is substantially surrounded by the overflow reservoir.
- The coolant tank of claim 1 or claim 3, wherein the pressure cap includes:a pressure limiting valve configured to release the fluid to the overflow reservoir when the pressurized reservoir reaches a first predetermined pressure; anda check valve configured to allow the fluid to flow from the overflow reservoir to the pressurized reservoir when the pressure in the pressurized reservoir drops below a second predetermined value.
- The coolant tank of claim 1 or claim 3, further comprising an overflow port in fluid communication with the overflow reservoir and configured to vent the fluid to the atmosphere.
- The coolant tank of claim 1 or claim 3, further comprising a duct in fluid communication between the pressure cap and the overflow reservoir, the duct having at least a portion of a wall in common with the fill neck.
- The coolant tank of claim 3, wherein the entire overflow reservoir is positioned above the pressurized reservoir.
- The coolant tank of claim 1 or claim 3, wherein the fill neck extends vertically from the pressurized reservoir into the overflow reservoir.
- The coolant tank of claim 1 or claim 3, wherein the inlet port is positioned near the top of the fill neck.
- A coolant tank for receiving a fluid from the cooling system of an internal combustion engine, comprising:an overflow tank, the overflow tank includingan overflow reservoir maintained at atmospheric pressure, andan overflow duct in fluid communication with the overflow reservoir; and a pressurized tank integrated with the overflow tank, the pressurized tank includinga pressurized reservoir configured to contain the fluid;an inlet port in fluid communication with the pressurized reservoir and configured to direct fluid from the cooling system and into the pressurized reservoir,an outlet port in fluid communication with the pressurized reservoir and configured to direct the fluid from the pressurized reservoir to the cooling system,a fill neck in fluid communication with the pressurized reservoir, wherein the overflow duct is integrated with the fill neck, anda pressure cap removably coupled to the fill neck, wherein the pressure cap includesa pressure limiting valve configured to allow the fluid to flow from the pressurized reservoir, through the fill neck, and through the overflow duct to the overflow reservoir when the pressurized reservoir reaches a first predetermined pressure, anda check valve configured to allow the fluid to flow from the overflow reservoir, through the overflow duct, and through the fill neck to the pressurized reservoir when the pressure in the pressurized reservoir drops below a second predetermined pressure.
- The coolant tank of claim 11, wherein at least a portion of the fill neck is substantially surrounded by the overflow reservoir.
- The coolant tank of claim 11, further comprising an overflow port in fluid communication with the overflow reservoir and configured to vent the fluid to the atmosphere.
- The coolant tank of claim 11, wherein the position of the pressure cap relative to the pressure reservoir defines an upward direction, and wherein the overflow reservoir is positioned substantially above the pressurized reservoir.
- The coolant tank of claim 11, wherein the inlet port is positioned near the top of the fill neck.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/371,223 US20100206882A1 (en) | 2009-02-13 | 2009-02-13 | Multi chamber coolant tank |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2221462A1 true EP2221462A1 (en) | 2010-08-25 |
Family
ID=42315638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10250121A Withdrawn EP2221462A1 (en) | 2009-02-13 | 2010-01-25 | Multi chamber coolant tank |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100206882A1 (en) |
EP (1) | EP2221462A1 (en) |
JP (1) | JP2010190219A (en) |
CN (1) | CN101806239A (en) |
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Also Published As
Publication number | Publication date |
---|---|
CN101806239A (en) | 2010-08-18 |
JP2010190219A (en) | 2010-09-02 |
US20100206882A1 (en) | 2010-08-19 |
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