Diverter accessories for engine cooling systems

Abstract

A passive flow divider fitting for a cooling system of an engine, comprising a base defining an internal cavity, an inlet opening extending through the base and in fluid communication with the internal cavity, an outlet opening in fluid communication with the internal cavity, and a bypass opening in fluid communication with the internal cavity. The base is configured to be removably arranged in a cavity of an engine block. The inlet opening is positioned to receive coolant when the passive flow divider fitting is arranged in the cavity of the engine block. When the passive flow divider fitting is arranged in the cavity of the engine block, the outlet opening is in fluid communication with an area outside the engine block. When the passive flow divider fitting is arranged in the cavity of the engine block, the bypass opening is in fluid communication with an internal coolant passage of the engine block.

Description

Technical Field

[0001] The present invention relates generally to a cooling system for an engine and, more particularly, to a cooling system that utilizes a passive flow diverter fitting to divert fluid within the cooling system. Background Art

[0002] Internal combustion engines used to operate motor vehicles or heavy machinery and equipment generate a large amount of heat that must be dissipated. If not properly dissipated, the heat can reduce the operating efficiency of the engine and may ultimately cause damage to the engine. The engine typically includes a cooling system that is configured to circulate a coolant through the engine block so that the coolant captures heat from the engine to cool the engine. The coolant then moves through a radiator so that the coolant loses heat to the atmosphere before passing back through the engine block.

[0003] In some cases, the cooling system of the engine can be used to provide auxiliary cooling to coolers for engine accessories (e.g., transmission cooler, brake cooler, etc.). For example, a conventional transmission cooler and / or brake cooler typically uses the engine's coolant to cool the hydraulic fluid used with the transmission and / or brake cooler. These coolers for engine accessories typically take the form of shell and tube heat exchangers, which means that these coolers are typically too large to be mounted on the engine and must be located elsewhere in the machine chassis.

[0004] German Patent No. DE 10127711 ("the '711 patent") discloses a three-way valve that can be used as a replacement for a thermostatic valve in a cooling system of an engine. The three-way valve is used to control the mixing ratio between a supply line leading to a radiator and a bypass line bypassing the radiator. The three-way valve includes a throttle body that is actively controlled to control the splitting of coolant flow to the radiator and the bypass line. Summary of the invention

[0005] An exemplary coolant diverter fitting includes a base defining an internal cavity, an inlet opening extending through the base and in fluid communication with the internal cavity, an outlet opening in fluid communication with the internal cavity, and a bypass opening in fluid communication with the internal cavity. The base is configured to be removably disposed in a cavity of an engine block. When the diverter fitting is disposed in the cavity of the engine block, the inlet opening is in fluid communication with an area outside the engine block. When the diverter fitting is disposed in the cavity of the engine block, the outlet opening is in fluid communication with an area outside the engine block. When the diverter fitting is disposed in the cavity of the engine block, the bypass opening is in fluid communication with an internal coolant passage of the engine block.

[0006] An exemplary embodiment of an internal combustion engine includes an engine block defining an internal coolant passage of the block, a cavity disposed in the engine block, and a flow divider fitting disposed in the cavity. The cavity includes a receiving opening for receiving coolant, an internal opening in fluid communication with the internal coolant passage of the block, and an external opening in fluid communication with an area outside the engine block. The flow divider fitting includes a base, which defines an internal cavity, an inlet opening, an outlet opening, and a bypass opening. The inlet opening is in fluid communication with the receiving opening of the cavity. The outlet opening is in fluid communication with the external opening of the cavity. The bypass opening is in fluid communication with the internal opening of the cavity.

[0007] An exemplary cooling system includes a pump, an engine having an engine block, a flow divider fitting, and a radiator. The pump is configured to pump coolant through the cooling system. The engine block includes a coolant passage inside the block, a cavity, and a return opening. The cavity is in fluid communication with a coolant passage inside the block and an area outside the housing, and the return opening is in fluid communication with a coolant passage inside the block and an area outside the housing. The flow divider fitting includes a base, which defines an internal cavity, an inlet opening, an outlet opening, and a bypass opening. The inlet opening is in fluid communication with the pump. The outlet opening is in fluid communication with the inlet opening, and the bypass opening is in fluid communication with the inlet opening of the flow divider fitting and the coolant passage inside the block of the engine block. The external cooler has an inlet passage in fluid communication with the outlet opening of the flow divider fitting and an outlet passage in fluid communication with the return opening of the engine block. The radiator is in fluid communication with the engine block and the pump. The pump is configured to pump coolant through the diverter fitting so that a first portion of the coolant moves through the outlet opening of the diverter fitting and into the external cooler, and a second portion of the coolant moves through the bypass opening of the diverter fitting and into the internal coolant passage of the engine block. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of an exemplary embodiment of a cooling system for an engine;

[0009] Figure 2 yes Figure 1 A schematic top view of a portion of a cooling system of FIG. 1 showing coolant moving through a diverter fitting and into an engine block and an external cooler;

[0010] Figure 3 yes Figure 1 A perspective view of an exemplary embodiment of a flow diverter assembly for a cooling system of FIG.

[0011] Figure 4 yes Figure 1 A partial perspective view of an exemplary embodiment of a cooling system for an engine block;

[0012] Figure 5 Is set in Figure 4 in the engine block Figure 3 a partial perspective view of a diverter fitting; and

[0013] Figure 6 is attached to Figure 4 A perspective view of an exemplary embodiment of an external cooler of an engine block. DETAILED DESCRIPTION

[0014] The specific embodiments describe exemplary embodiments of the present invention and are not intended to limit the scope of the claims in any way. In fact, the present invention is broader than the exemplary embodiments and is not limited by the exemplary embodiments, and the terms used in the claims have their full ordinary meanings. The features and components of the exemplary embodiments may be incorporated into other exemplary embodiments. Inventions within the scope of this application may include additional features, or may have fewer features than those shown in the exemplary embodiments.

[0015] The present application discloses a flow divider fitting for diverting a fluid in a cooling system of an engine. Although the flow divider fitting described herein is described as being used with an engine, it should be understood that the flow divider fitting can be used with any other suitable type of cooling system or any other type of system in which a fluid is to be diverted.

[0016] Figure 1 An exemplary embodiment of a cooling system 100 for an engine 102 (e.g., an internal combustion engine) is shown. The cooling system includes a pump 104, a splitter fitting 108, an external cooler 110, and a radiator 114. The pump 104 is configured to pump a coolant (e.g., water, a mixture including water, oil, a mixture including oil, or any other suitable type of coolant) through the cooling system 100 to cool the engine 102, as well as to cool the fluid moving through the external cooler 110. The pump 104 may be, for example, a centrifugal pump or any other suitable type of pump for an engine. The external cooler 110 may be, for example, a transmission cooler, a brake cooler, or any other suitable type of external cooler that receives auxiliary cooling from the cooling system 100 of the engine 102. In addition, the external cooler 110 may take any suitable form, such as a 4-port cooler, a shell and tube cooler, a bathtub 2-port cooler, or any other suitable type of cooler.

[0017] refer to Figure 1 and Figure 2 In some embodiments, the external cooler 110 is connected to the engine block 238 ( Figure 2 ), so that the external cooler 110 and the cavity 242 ( Figure 2 ) and the return opening 244 of the engine block 238. The cavity 242 and the return opening 244 are each connected to the internal coolant passage 240 ( Figure 2 ) and the exterior 246 ( Figure 2 ) The two are in fluid communication. The internal coolant passage 240 may be, for example, an entry rail, an inlet rail, a cylinder head water jacket, or any other coolant passage within the engine block.

[0018] In the illustrated embodiment, the flow splitter fitting 108 includes an inlet opening 224 ( Figure 2 )、Outlet opening 226( Figure 2 ) and bypass opening 228 ( Figure 2 The inlet opening 224 is configured to be positioned to receive coolant when the diverter fitting 108 is disposed in the cavity 242 of the engine block. For example, the inlet opening 224 may be aligned with the coolant passage 248 ( Figure 2 ) is fluidly connected, the coolant passage 248 is positioned on the outer surface of the engine block 238 and is in fluid communication with the pump 104. In other embodiments, the coolant passage 248 can be arranged inside the engine block 238, and the coolant passage 248 is in fluid communication with the exterior 246 of the engine block.

[0019] Additionally, the splitter fitting 108 is positioned in the cavity 242 such that the outlet opening 226 is in fluid communication with an exterior 246 of the engine block 238 (and the external cooler 110 when the external cooler 110 is attached to the engine block 238), and such that the bypass opening 228 is in fluid communication with an internal coolant passage 240 of the engine block 238. In certain embodiments, the splitter fitting 108 is a modular component that can be inserted into and removed from the engine 102.

[0020] When the flow divider fitting 108 is positioned in the cavity 242, the coolant 232 pumped by the pump 104 through the passage 248 moves into the inlet opening 224 of the flow divider fitting 108 and is divided such that the first portion 234 ( Figure 2 ) The second portion 236 of the coolant 232 ( Figure 2) moves through the bypass opening 228 and enters the internal coolant passage 240 of the engine block 238. The first portion 234 of coolant 232 re-enters the internal coolant passage 240 of the engine block 238 through the return opening 244 after moving through the external cooler 110, such that the first portion 234 of coolant 232 and the second portion 236 mix in the internal coolant passage 240 of the engine block 238 adjacent to the first portion 234 of the internal coolant passage 240 entering the engine block 238. The flow divider fitting 108 is configured to limit the amount of coolant that moves into the external cooler 110.

[0021] Reference again Figure 1 , after the coolant moves through the external cooler 110 and the engine 102, the coolant can move to the radiator 114. The coolant entering the radiator 114 can be heated due to moving through the external cooler 110 and the engine 102. The radiator 114 is configured to cool the coolant by transferring heat from the coolant to the surrounding atmosphere. The radiator 114 can take any suitable form, such as any form of heat exchange capable of transferring heat from the coolant to the atmosphere. After the coolant moves through the radiator 114, the cooled coolant returns through the pump 104 so that the pump 104 can pump the coolant through the cooling system 100 again.

[0022] In certain embodiments, the cooling system 100 includes an oil cooler 106 disposed between the pump 104 and the engine 102. In these embodiments, the pump 104 may first pump coolant through the oil cooler 106 so that the coolant cools the oil used to lubricate components of the engine 102. The oil cooler 106 may be attached to the engine block 238 ( Figure 2 ), or the oil cooler 106 can be separated from the engine 102 while remaining in fluid communication with the engine 102.

[0023] In some embodiments, the cooling system 100 includes a thermostat housing 112 disposed between and in fluid communication with the engine 102 and the radiator 114. After the coolant moves through the engine 102, the coolant enters the thermostat housing 112. The thermostat housing 112 houses a thermostat 130 configured to regulate the temperature of the coolant. If the coolant is below a predetermined temperature, the thermostat 130 maintains a normally closed position, allowing the coolant to move through the bypass line 118 (rather than moving into the radiator 114) and into the pump 104. If the coolant is above a predetermined temperature, the thermostat 130 moves to an open position, allowing the coolant to move into the radiator 114.

[0024] In some embodiments, pump 104 pumps a portion of the coolant to aftercooler 116. The coolant moving through aftercooler 116 cools the compressed air exiting a turbocharger compressor (not shown) before the air enters engine 102. Figure 1 As shown, the coolant moves into the engine 102 after leaving the aftercooler 116, so that the coolant mixes with the coolant entering the engine through the splitter fitting 108 and the external cooler 110. In other embodiments, the coolant from the aftercooler 116 moves into the thermostat housing 112 after leaving the aftercooler 116, so that the coolant mixes with the coolant from the engine 102 in the thermostat housing 112. In each of the above embodiments, the mixed coolant leaves the thermostat housing 112 and moves to the bypass line 118 or the radiator 114, depending on whether the thermostat 130 is in the open position or the closed position.

[0025] refer to Figure 3 , an exemplary embodiment of a passive diverter fitting 108 includes a base 320 defining an internal cavity 322, an inlet opening 224, an outlet opening 226, and a bypass opening 228. The base 320 can be made of, for example, iron, plastic, or any other suitable material. In some embodiments, the diverter fitting 108 is made by a casting process or an injection molding process, including the inlet opening 224, the outlet opening 226, and the bypass opening 228. In some embodiments, the bypass opening 228 is not made by the same process used to make the other parts of the diverter fitting 108, but the bypass opening 228 is made after the remaining parts of the diverter fitting are made. For example, the bypass opening 228 can be formed by drilling a hole through the base 320 of the diverter fitting 108.

[0026] In the illustrated embodiment, the base 320 includes a cylindrical sidewall 374, an open first end 370, and a closed second end 372. The outlet opening 226 is defined by the open first end 370 of the base 320. The cylindrical sidewall 374 includes an inner surface 376 and an outer surface 378, the inner surface 376 defining the interior cavity 322. The inlet opening 224 extends through the cylindrical sidewall 374 so that the inlet opening 224 is in fluid communication with the interior cavity 322. The inlet opening 224 can be positioned on the base 320 so that the axis extending through the inlet opening 224 is perpendicular to the axis extending through the outlet opening 226. The bypass opening 228 extends through the cylindrical sidewall 374 so that the bypass opening 228 is in fluid communication with the interior cavity 322. The bypass opening 228 can be positioned on the base 320 so that the axis extending through the inlet opening 228 is perpendicular to the axis extending through the outlet opening 226. In certain embodiments, the inlet opening 224 is positioned on the base substantially opposite the location of the bypass opening 228 (e.g., between about 150 degrees and about 210 degrees, such as about 180 degrees, around the cylindrical sidewall 374 of the base 320). Although the base 320 is described as having a cylindrical shape, it should be understood that the base 320 may take any suitable form capable of being positioned within the cavity 242 of the engine block.

[0027] In certain embodiments, such as the illustrated embodiment, the flow divider fitting 108 includes a protrusion or rib 380 extending from the inner surface 376 of the base 320. The rib 380 is configured to strengthen the base 320 to prevent the flow divider fitting 108 from failing. For example, coolant entering the interior cavity 322 of the base 320 through the inlet opening 224 may engage the inner surface 376 of the base 320 before moving through the outlet opening 226 or the bypass opening 228, and the pressure exerted by the coolant on the inner surface 376 may cause the flow divider fitting 108 to wear over time. The rib 380 is configured to provide rigidity to the base 320 to strengthen the base and prevent the flow divider fitting 108 from failing due to this wear. In some embodiments, the rib 380 is positioned on the inner surface 376, substantially opposite the inlet opening 224 (e.g., between about 150 degrees and about 210 degrees, such as about 180 degrees, around the cylindrical sidewall 374 of the base 320). However, the ribs 380 may be positioned anywhere on the base 320 that allows the diverter fitting to be strengthened and prevent failure of the diverter fitting.

[0028] Based on the intended use of the diverter fitting 108, the inlet opening 224, the outlet opening 226, and the bypass opening 228 can have any suitable size and shape. That is, these openings 224, 226, 228 can have any size and shape with any suitable cross-sectional area that allows sufficient cooling of the external cooler 110. In the illustrated embodiment, the outlet opening 226 and the bypass opening 228 have a circular shape. In some embodiments, the area defined by the bypass opening 228 is smaller than the area defined by the outlet opening 226. For example, the area defined by the bypass opening 228 can be between about 5% and about 25% of the size of the area defined by the outlet opening 226.

[0029] refer to Figure 3-6 The flow divider fitting 108 is configured to be disposed in the cavity 242 of the engine block 238 such that the flow divider fitting 108 is positioned to receive the flow from the pump (eg Figure 1 The pump 104 shown is used to supply coolant. Figure 4 and Figure 5 In the illustrated embodiment, the engine block 238 includes an oil cooler cavity 450 disposed on an outer surface thereof, wherein the oil cooler cavity 450 is configured to receive an oil cooler (e.g., Figure 1 ). Cavity 242 includes a receiving opening 452 in fluid communication with oil cooler cavity 450, such that the oil cooler is in fluid communication with cavity 242. Diverter fitting 108 may be positioned in cavity 242 such that inlet opening 224 is in fluid communication with receiving opening 452, and thus in fluid communication with oil cooler 106.

[0030] Reference again Figure 3-6 When the diverter fitting 108 is positioned in the cavity 242 of the engine block 238, the outlet opening 226 of the diverter fitting 108 is aligned with the outer opening 454 of the cavity 242 ( Figure 4 ) fluid communication. A portion of the coolant (e.g., Figure 2 A portion 234 of the coolant 232 is shown moving through the outlet opening 226 of the diverter fitting and through the exterior opening 454 of the cavity 242 .

[0031] refer to Figure 4 , the cavity 242 includes an internal opening 456 that is in fluid communication with the internal coolant passage 240 of the engine block 238. Figure 3-5 When the flow divider fitting 108 is positioned within the cavity 242 of the engine block 238, the bypass opening 228 is in fluid communication with the interior opening 456 of the cavity 242. A portion of the coolant (e.g., Figure 2A portion 236 of the coolant 232 is shown moving through the outlet opening 226 of the diverter fitting and through the exterior opening 454 of the cavity 242 .

[0032] refer to Figure 4-6 , the external cooler 110 is attached to the outer surface of the engine block 238 so that the coolant inlet 658 of the external cooler 110 is in fluid communication with the external opening 454 of the cavity 242, and so that the outlet (not shown) of the external cooler 110 is in fluid communication with the return opening 244 of the engine block 238. Figure 2 After the portion 234 of coolant 232 (shown in FIG. 1 ) moves through the external cooler 110, the coolant moves to the internal coolant passage 240 of the engine block 238 and combines with a portion of the coolant (e.g., Figure 2 236 of the coolant 232 shown). In various embodiments, the external cooler 110 includes an inlet conduit 660 and an outlet conduit 662, wherein a heated fluid (e.g., hydraulic fluid) moves from the inlet conduit 660 through the external cooler 110 and exits through the outlet conduit 662. The heated fluid is cooled by the coolant moving through the external cooler. The external cooler 110 can be, for example, a transmission cooler, a brake cooler, or any other suitable type of external cooler that receives auxiliary cooling from the cooling system 100. In addition, the external cooler 110 can take any suitable form, such as a 4-port cooler, a shell and tube cooler, a bathtub 2-port cooler, or any other suitable type of cooler.

[0033] Industrial Applicability

[0034] Current cooling systems that include external coolers move the entire amount of coolant into the external cooler before the coolant enters the interior of the engine block. The external cooler 110 can be, for example, a transmission cooler or a brake cooler. However, transmission and brake coolers are typically in the form of shell-and-tube coolers, and shell-and-tube coolers are typically too large to be mounted on the engine, which means that these coolers typically need to be located elsewhere on the machine chassis. However, the external cooler can be in the form of a 4-port cooler. In these cases, the external cooler can be attached to the engine because the 4-port cooler does not have the same size limitations as the shell-and-tube cooler.

[0035] In some cases, it is advantageous to have a system in which the entire amount of coolant does not move through an external cooler, but rather only a portion of the coolant moves through the external cooler. For example, if a 4-port external cooler is used and the entire amount of coolant moves through the external cooler, the external cooler may be overcooled and / or cause a pressure limitation for the pump that pumps the coolant through the cooling system. In addition, moving the entire coolant through a 4-port cooler is a waste of power for the cooling system. In the case of a shell and tube external cooler, the shell and tube cooler may not require the entire amount of coolant for proper cooling, which means that moving the entire amount of coolant through the external cooler is a waste of power. Although a 4-port external cooler and a shell and tube external cooler are described above, it should be understood that any type of external cooler may be used in situations where it is disadvantageous to move the entire amount of coolant through an external cooler.

[0036] The disclosed flow divider fitting 108 is configured for use in a cooling system of an engine to limit the amount of coolant that moves to an external cooler. Figure 2 , when the splitter fitting 108 is positioned in the cavity 242 of the engine 102, the coolant 232 pumped through the passage 248 moves into the inlet opening 224 of the splitter fitting 108, so that a first portion 234 of the coolant 232 moves through the outlet opening 226 and enters the external cooler 110, and a second portion 236 of the coolant 232 moves through the bypass opening 228 and enters the internal coolant passage 240 of the engine block 238. The first portion 234 of the coolant 232 enters the internal coolant passage 240 through the return opening 244 after moving through the external cooler 110, so that the first portion 234 of the coolant 232 and the second portion 236 of the coolant 232 mix in the internal coolant passage 240 of the engine block 238. The size of the outlet opening 226 and the bypass opening 228 dictates the amount of coolant sent to the external cooler 110. The flow divider fitting 108 is configured to limit the amount of coolant moved into the external cooler 110 , thereby preventing overcooling of the external cooler, pressure limiting of the water pump, and wasted power of the cooling system.

[0037] In certain embodiments, the diverter fitting 108 is modular, which is advantageous because it allows the diverter fitting to be removed and replaced if necessary, as well as allowing the diverter fitting to be used on multiple engines. The replaceability of the diverter fitting 108 is advantageous because it allows the diverter fitting 108 to be used with outlet openings 226 and bypass openings 228 of different sizes, depending on the situation in which the diverter fitting is used. For example, if the situation requires that more coolant be supplied to the external cooler, a diverter fitting with a smaller bypass opening 228 can be used, which will allow more coolant to move through the outlet opening 226 and into the external cooler 110. In some cases, the cooling system 100 may not include an external cooler 110, and the diverter fitting 108 is not required. In these cases, the modular diverter fitting 108 is advantageous because the diverter fitting can be removed or omitted, and the openings 242, 244 of the engine block 238 can be capped. Additionally, the passive design of the diverter assembly 108 is advantageous because it eliminates the need for active control of the diverter assembly 108 during use of the cooling system.

[0038] It should be understood that the foregoing description provides examples of the disclosed systems and techniques. However, it is contemplated that other embodiments of the present invention may differ in detail from the foregoing examples. All references to the present invention or its examples are intended to reference the specific examples discussed at that point, and are not intended to imply any limitation on the scope of the present invention more generally. All distinctions and inconsistent language regarding certain features are intended to indicate a lack of preference for these features, but not to exclude them entirely from the scope of the present invention, unless otherwise indicated. Therefore, the present invention includes all modifications and equivalents of the subject matter described in the appended claims as permitted by applicable law. In addition, any combination of the above-mentioned elements in all possible variations thereof is covered by the present invention, unless otherwise stated herein or clearly contradicted by the context.

Claims

1. A passive flow divider fitting for a cooling system of an engine, the engine comprising an engine block, a cavity and a return opening, the engine block defining an internal block coolant passage, the cavity being in fluid communication with the internal block coolant passage, the return opening being in fluid communication with the internal block coolant passage, the passive flow divider fitting comprising: a base defining an interior cavity, wherein the base is configured to be removably disposed within the cavity of the engine block; an inlet opening extending through the base so that the inlet opening is in fluid communication with the interior cavity, wherein the inlet opening is positioned to receive coolant when the passive diverter fitting is disposed in the cavity of the engine block; an outlet opening in fluid communication with the interior cavity, wherein when the passive diverter fitting is disposed in the cavity of the engine block, the outlet opening is in fluid communication with an area external to the engine block; and a bypass opening extending through the base so that the bypass opening is in fluid communication with the internal cavity, wherein when the passive diverter fitting is disposed in the cavity of the engine block, the bypass opening is in fluid communication with an internal coolant passage of the block, The coolant received by the internal cavity of the passive diverter fitting via the inlet opening is diverted so that a first portion of the coolant moves sequentially through the outlet opening into the area outside the engine block and through the return opening into the internal coolant passage of the block, and a second portion of the coolant moves through the bypass opening and into the internal coolant passage of the block.

2. The passive flow splitter accessory of claim 1 , wherein the engine block includes an oil cooler cavity on an outer surface of the engine block, and wherein the inlet opening of the passive flow splitter accessory is in fluid communication with the oil cooler cavity when the passive flow splitter accessory is disposed in the cavity of the engine block.

3. The passive diverter accessory of claim 1, wherein the base comprises at least one of iron and plastic.

4. The passive flow splitter fitting of claim 1, wherein a first area defined by the bypass opening is between about 5% and about 25% of a second area defined by the outlet opening.

5. The passive flow diverter fitting of claim 1, wherein the base comprises a cylindrical wall, an open first end, and a closed second end; and wherein the inlet opening and the bypass opening extend through the cylindrical wall.

6. The passive flow diverter fitting of claim 5, wherein the bypass opening is a bore extending through the cylindrical wall of the base.

7. The passive flow diverter fitting of claim 6, wherein the inlet opening is positioned on the base such that the inlet opening is between about 150 degrees and about 210 degrees away from the bypass opening relative to the cylindrical wall of the base.

8. The passive flow diverter assembly of claim 1, wherein: The base is made by injection molding.

9. The passive diverter fitting of claim 1 further comprising ribs extending from an inner surface of the base.

10. The passive flow diverter fitting of claim 9, wherein the base includes a cylindrical wall through which the inlet opening extends, and the rib is positioned on the base such that the rib is between about 150 degrees and about 210 degrees away from the inlet opening relative to the cylindrical wall of the base.

Images