Patent Application
20160177806
This patent disclosure relates generally to exhaust outlet elbows for natural gas burning turbocharged engines. More particularly, to a center divider for the exhaust outlet elbow and how the center divider connects to the interior wall of an exhaust elbow.
In areas having cold weather, in particular in the winter, homes require heat to keep the occupants warm. Natural gas is often used as an economical source to generate heat. Natural gas lines may be located in remote areas of the country and require a power source to move the gas in a gas line from point A to point B. Engines, such as turbocharged gas engines may be used as the required power source to move the gas. Turbocharged gas engines are operated at high temperatures and can use natural gas as their fuel source.
An enclosure can be used to store some or all of the turbocharged gas engine components in order to protect the various components during use. However, the enclosure may achieve undesired high temperatures inside the box during the operation of the turbocharged gas engines.
Some turbocharged gas engines may incorporate two turbochargers. Exhaust gases from the engine may be routed into the turbochargers and then directed to the exhaust elbow. Various portions of the exhaust elbow may be at different temperatures due to the elbow being more exposed to the hot exhausts gases. Thus, it may be desirable to have a system and method for cooling the exhaust elbow to reduce thermal stresses resulting of various portions of the exhaust elbow being at different temperatures.
U.S. Pat. No. 5,495,873 purports to be directed to an acoustically improved, air gap engine exhaust conduit having a dual wall, air gap, metal exhaust conduit of an outer jacket and a thin inner liner, the jacket having at least one exhaust gas inlet and an exhaust gas outlet, the liner having at least one inlet and an outlet, the jacket inlet and the liner inlet being adjacent each other, the liner being secured to the jacket adjacent the jacket inlet and the liner inlet, the liner outlet being optionally in engagement with the jacket, and the liner otherwise being spaced from the jacket over its length to form a continuous air gap from the liner inlet to the liner outlet, a pattern of indentation ribs protruding into or out of the jacket over substantially all of said jacket, each indentation rib protruding toward or away from the liner, and terminating short of the liner to be spaced from and not in engagement with the liner, to maintain the continuous air gap. Optionally, the liner can have a pattern of indentation ribs protruding inwardly or outwardly and, if the latter, terminating short of the jacket so as not to engage the jacket and leave an air gap over the length thereof. However, the cooling apparatus and or system described in this patent and the aspects and features described for accounting for thermal expansion and/or thermal stresses due to different aspects of the conduit being different temperatures may not be as effective in exhaust conduits or elbows having a different geometry than what is shown in the patent.
In some aspects, an exhaust outlet elbow includes: a body having an outer wall and an interior wall, the interior wall defining, at least in part, a first interior chamber; a rib having a base portion connected to the interior wall and a free end, the rib dividing the interior chamber into first and second portions; and a scalloped region of the rib located between the free end and the interior wall.
In some aspects, a method of providing cooling to an interior rib of an exhaust elbow includes: locating the rib in an interior chamber; attaching the rib to a side wall of the chamber; and providing a scalloped region between a portion of the rib and the side wall.
In some aspects, an exhaust outlet elbow includes: a body having an outer wall and an interior wall, the interior wall defining, at least in part, an interior chamber; a rib having a base portion connected to the interior wall and a free end, the rib dividing the interior chamber into first and second portions; a scalloped region of the rib located between the free end and the interior wall, wherein the scalloped region includes a curved surface providing a transition between a portion of the free end and stepped portion; a stepped portion connecting the interior wall to the rib at the scalloped portion; first and second exhaust inlets configured to provide fluid communication through the outer and interior wall of the body into the interior chamber and the rib is dimensioned and located within the interior chamber to form a barrier between the first and second exhaust inlets.
The disclosure relates to a device and method that facilitate the transfer of natural gas from point A to point B. Although turbocharged engines using natural gas as the fuel are discussed herein, the device and method can be used with any type of engine including fossil fueled gasoline engines, and the like in order to prevent undesired temperatures within an enclosure. Further, although two engines are discussed, the device and method can be utilized with more or less engines.
In other embodiments, the heat shield 202 may be made of a material including tin, aluminum, or a composite metal material and the like. The heat shield 202 may be constructed and arranged to house some or all of the components of the turbochargers 204. Turbochargers 204 are shown in
Also illustrated in
The waste gate's 218 function is to bypass some of the exhaust flow around the turbine section of the turbochargers 204. Exhaust may enter the waste gate 218 through an exhaust outlet 220. The exhaust can help to prevent over speed of the turbochargers 204. As noted above, during use the turbochargers 204 can generate a significant amount of heat within the heat shield 202. By placing the exhaust outlet elbow 300 that is fluid cooled within the heat shield 202, the exhaust outlet elbow 300 can reduce the ambient temperature within the heat shield 202. Controlling the ambient temperature within the heat shield 202 may avoid the temperature within the enclosure 200 from reaching undesired levels.
The body 302 defines an interior chamber 310. A divider rib 312 is located in the interior chamber 310. The divider rib 312 may be cast with, and be integral with, the body 302. In other aspects, the divider rib 312 may be secured to the body 302 by fasteners, welding, or any other means for attaching the divider rib 312 to the body 302. The divider rib 312 divides the interior chamber 310 into a first side 314 and a second side 316. The divider rib 312 may include a free end 313 opposite the portion of the divider rib 312 that attached to the body 302.
The divider rib 312 may terminate at one end with a scalloped portion 318 adjacent to a stepped portion 319 attached to, or integral with, an interior wall 320 of the body 302. In some aspects, the stepped portion 319 and scalloped portion 318 provide a transition between the interior wall 320 and the divider rib 312. The scalloped portion 318 may include a curved surface curving down from the free end 313 of the divider rib 312 to the stepped portion 319.
A first exhaust inlet 321 provides fluid communication through the body 302 and interior wall 320 to the first side 314 of the interior chamber 310. A second exhaust inlet 323 provides fluid communication from outside of the body 302, through the body 302, and interior wall 320 into the second side 316 of the interior chamber 310. In some aspects, the divider rib 312 is dimensioned and located to provide a barrier from exhaust entering the interior chamber 310 from the first exhaust inlet 321 from flowing through the interior chamber 310 and out the second exhaust inlet 323 and vice versa. In this manner, the divider rib 312 interrupts the flow of exhaust after flowing through the inlets 321, 323 and forces that exhaust to fill the interior chamber 310.
A main or top connecting surface 322 (referred to herein for convenience as a first connecting surface) is located on a top portion of the body 302. The connecting surface 322 is generally flat and contains an array 324 of holes 326. In some aspects, the holes 326 are tapped and provide a way to attach a conduit (not shown), cover 301, or other structures to the body 302. For example, if it were desired to attach a conduit to the body 302, the conduit having a flange may be fitted onto the connecting surface 322 and fasteners may extend through a flange in a conduit (not shown) and attach to the body 302 via the threaded or tapped holes 326.
In some aspects, a waste gate housing 328 is located on the body 302. In some aspects, the waste gate housing 328 may be cast with, and be an integral with, the body 302. In other aspects of the disclosure, the waste gate housing 328 may be attached to the body 302 via fasteners or any other means for attaching the waste gate housing 328 to the body 302. A second connecting surface 330 is located on the waste gate housing 328 which is attached to or integral with the body 302. In some aspects, the second connecting surface 330 may be located adjacent to the first connecting surface 322. The second connecting surface 330 may also contain several connecting holes 332. In some aspects, these connecting holes 332 may also be tapped to accept and secure fasteners such as bolts. The waste gate 218 may be connected to the waste gate housing 328 via bolts 219 (see
In some aspects, particularly in instances where the body 302 is made of a cast material such as cast iron, various freeze plug holes 336 may be located at various locations on the body 302. The freeze plug holes 336 are an artifact of the manufacturing and casting process and are not particularly relevant to specific aspects described in the claims.
Hot exhaust gases can enter the interior chamber 310 through the exhaust inlets 321 and 323 and waste gate inlet 344 (only inlets 321 and 344 are shown in
As one of ordinary skill in the art will appreciate after reviewing this disclosure, the body 302 may become hot as result of being in contact with the exhaust gases. As such, a coolant chamber 346 may be integrated within the body 302. The coolant chamber 346 may be located between the interior wall 320 and the outer wall 348 of the body 302. In some aspects, a coolant such as water, glycol, or any other suitable cooling fluid may be present in the coolant chamber 346. In some aspects, the interior wall 320 may separate the interior chamber 310 from the coolant chamber 346. At other locations, the interior wall 320 merely separates the interior chamber 310 from outside of the body 302.
The coolant chamber 346 may have a coolant inlet 342 and a coolant outlet 334 to allow cooling fluid to flow through the coolant chamber 346 and thereby cool the body 302. As stated above, the freeze plug holes 336 are an artifact of the manufacturing process and are optional features. Generally, while the elbow 300 is in use, the freeze plug holes 336 are filled with a plug or other material in order to prevent cooling fluid from flowing out of the coolant chamber 346.
In some aspects, the rib 312 may include an extended portion 350 that projects into the coolant chamber 346 in order to assist in cooling the rib 312. The extended portion, 350 allows for more cooling surfaces for the coolant to act on.
Due to peculiarities of various materials during heating and cooling, certain aspects of the rib 312 may be designed to assist in minimizing thermal stresses due to the expansion and contraction. For example,
Traditionally, flanges having connecting holes were used rather than having the holes 326 terminate within the body 302 to connect the body 302 to a conduit. The flanges with holes were used because the heat associated with hot exhausts could cause the components such as fasteners, washers, holes, etc. to become so hot that the components would seize within the body 302 making it difficult to change the exhaust conduit (not shown) or remove the body 302 from the conduit. However, in some aspects of the present application, the problem of heat causing the fasteners to seize is addressed by the fact that the cooling chamber 346 extends near the connecting surface 322 as shown in
In some aspects, it may be desired to prevent the free end 313 of the rib 312 from directly contacting the portion of the interior wall 320 that provides a barrier between the coolant chamber 346 and the interior chamber 310 because a portion of the interior wall 320 may be significantly cooler due to the coolant in the coolant chamber 346 then the free end 313 of the rib. As result of the separation, undue thermal stress on the free end 313 of the rib 312 may be avoided.
Additional detail of an example of the scalloped portion 318 is illustrated in
As one of ordinary skill the art can appreciate after reviewing this disclosure, exhaust outlet elbows for turbochargers may provide a variety of functions. For example, the exhaust elbow provides a variety of places for the exhaust gases to be diverted. Providing various inlets for the exhaust gases to flow into is one useful feature of the exhaust elbow.
It is desirable to provide structure within the exhaust outlet elbows to hinder gases entering the exhaust outlet elbow from one turbocharger to flow into the second turbocharger. As such, the divider rib as shown is used to hinder flow of exhaust gases from one turbocharger to the other. Due to the high temperatures of exhaust gases the exhaust elbow itself may become very hot. In order to control or regulate how hot the exhaust elbow gets, coolant may flow through the exhaust elbow through a cooling chamber.
As one of ordinary skill the art can appreciate after reviewing this disclosure, portions of the exhaust elbow that are in contact with the cooling chamber may be cooler than other aspects of the exhaust elbow not in direct contact with the cooling chamber. Therefore, different aspects of the exhaust elbow may be at very different temperatures. During operation, differences in temperature within the exhaust elbow may be quite large. As a result, it may be desirable to prevent some portions of the exhaust elbow from contacting other portions of exhaust elbow which can be at a greatly different temperature in order to avoid thermal stresses and/or other undesirable effects. In order to provide thermal transitions features, the scalloped portions, fillets, and stepped portions may be used.
Because of the complex and ever evolving requirements placed upon modern machinery such as exhaust elbows, various improvements to the elbows may be made over time. As such, it may be desirable to maintain various interfaces so that elbows can be removed and replaced within larger machines without having to reconfigure connection points. Therefore, arranging fasteners in standard arrays dimensioned to be the same as former arrays may be desirable. Furthermore, the ability to provide an array of holes that are tapped directly as part of the body enables the body to be of a larger diameter than previous exhaust apparatuses which relied on flanges having holes at various attachment points.
The many features and advantages of the disclosure are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the disclosure which fall within the true spirit and scope of the disclosure. Further, since numerous modifications and variations will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the disclosure.
