Insulated exhaust duct system

Abstract

An insulated exhaust duct system includes a first exhaust duct, a second exhaust duct, a first insulation sleeve, and a second insulation sleeve. The first exhaust duct has a first exhaust duct end portion. The second exhaust duct has a second exhaust duct end portion configured to engage with the first exhaust duct end portion. The first insulation sleeve includes a first insulation sleeve insulation layer and a first insulation sleeve heat shield. The first insulation sleeve insulation layer is disposed about the first exhaust duct. The first insulation sleeve heat shield is disposed about the first insulation sleeve insulation layer. The first insulation sleeve extends beyond the first exhaust duct end portion. The second insulation sleeve includes a second insulation sleeve insulation layer and a second insulation sleeve heat shield.

Description

[0001] This application is a divisional application of the application filed on December 17, 2019, with application number 201980103044.8 and invention title "Insulated Exhaust Pipe System". Technical Field

[0002] This application generally relates to the field of insulated exhaust gas conduit systems for internal combustion engines. background

[0003] Engine exhaust is typically supplied to the atmosphere through a series of ducts. Insulation material can be provided around the ducts to mitigate heat transfer from the exhaust to items surrounding them. Typically, insulation material is wrapped around each duct. Joints between ducts can be exposed (e.g., not wrapped with insulation material) or can be wrapped with insulation material separately. In either case, it may be difficult to ideally mitigate heat transfer from the exhaust at the joints. Overview

[0004] In some vehicles, insulation is used to insulate the exhaust ducts (e.g., tubes or pipes) of exhaust aftertreatment systems. The joints of these exhaust ducts are typically not insulated. If insulation is used around the joints, it may be in separate pieces. However, these pieces are bulky and constitute additional maintenance. Therefore, using separate insulation pieces for joint coverage increases the time and cost of sourcing, manufacturing, and maintaining (installation and repair / replacement).

[0005] Furthermore, separate components may increase the overall space requirements of the system. Space requirements refer to the amount of physical space consumed by the exhaust aftertreatment system during installation (e.g., on a vehicle) and the location of that physical space (e.g., coordinates relative to the vehicle's coordinate system). In some applications, the physical space available to the exhaust aftertreatment system is limited due to the location of surrounding components, wiring or piping system requirements, or other similar constraints. Therefore, modifying the exhaust aftertreatment system is often difficult, as such modifications typically increase its space requirements. Such modifications may be necessary when it is desired to use various components (such as different types of dispensing modules) within the exhaust aftertreatment system.

[0006] To address this problem, this disclosure describes an insulated exhaust duct system that allows for thermal insulation of the joints in and around the exhaust aftertreatment system without requiring separate manufacturing or maintenance components or processes, while minimizing space requirements.

[0007] Various aspects of this application may be implemented in one or more of the following embodiments.

[0008] 1) In one embodiment, the thermally insulated exhaust duct system includes a first exhaust duct, a second exhaust duct, a first thermally insulated sleeve, and a second thermally insulated sleeve. The first exhaust duct has a first exhaust duct end portion. The second exhaust duct has a second exhaust duct end portion configured to engage with the first exhaust duct end portion. The first thermally insulated sleeve includes a first thermally insulated sleeve insulation layer and a first thermally insulated sleeve heat shield. The first thermally insulated sleeve insulation layer surrounds the first exhaust duct. The first thermally insulated sleeve heat shield surrounds the first thermally insulated sleeve insulation layer. The first thermally insulated sleeve extends beyond the end portion of the first exhaust duct. The second thermally insulated sleeve includes a second thermally insulated sleeve insulation layer and a second thermally insulated sleeve heat shield. The second thermally insulated sleeve insulation layer surrounds the second exhaust duct. The second thermally insulated sleeve heat shield surrounds the second thermally insulated sleeve insulation layer. The end portion of the second exhaust duct is exposed from the second thermally insulated sleeve. The first thermally insulated sleeve surrounds the end portion of the second exhaust duct.

[0009] 2) The thermal insulation and exhaust duct system according to 1), wherein:

[0010] The first heat insulation sleeve heat insulation layer includes:

[0011] The main body of the first heat-insulating sleeve is connected to the first exhaust pipe; and

[0012] The end of the insulation layer of the first insulation sleeve is adjacent to the main body of the insulation layer of the first insulation sleeve and separate from the first exhaust pipe.

[0013] The first heat insulation sleeve heat shield includes:

[0014] The main body of the first heat-insulating sleeve heat shield is connected to the main body of the first heat-insulating sleeve heat insulation layer and the end of the first heat-insulating sleeve heat insulation layer; and

[0015] The end portion of the first heat insulation sleeve heat shield is adjacent to the main body of the first heat insulation sleeve heat shield. The end portion of the first heat insulation sleeve heat shield is connected to the end of the first heat insulation layer of the first heat insulation sleeve and extends from the main body of the first heat insulation sleeve heat shield toward the second exhaust pipe.

[0016] 3) The thermal insulation and exhaust duct system according to 2), wherein:

[0017] The second heat insulation sleeve includes the following heat insulation layer:

[0018] The main body of the second heat insulation sleeve is connected to the second exhaust pipe; and

[0019] The end of the second heat insulation sleeve heat insulation layer is adjacent to the main body of the second heat insulation sleeve heat insulation layer and connected to the second exhaust pipe;

[0020] The second heat insulation sleeve heat shield includes:

[0021] The main body of the second heat-insulating sleeve heat-shielding component is connected to the main body of the second heat-insulating sleeve heat-insulating layer and the end of the second heat-insulating sleeve heat-insulating layer; and

[0022] The end portion of the second heat insulation sleeve heat shield is adjacent to the body of the second heat insulation sleeve heat shield. The end portion of the second heat insulation sleeve heat shield is connected to the end of the heat insulation layer of the second heat insulation sleeve and extends from the body of the second heat insulation sleeve heat shield toward the second exhaust pipe. The end portion of the second heat insulation sleeve heat shield is facing the end portion of the first heat insulation sleeve heat shield.

[0023] 4) According to the heat insulation exhaust pipe system described in 3), the end portion of the second heat insulation sleeve heat shield is facing the end portion of the first heat insulation sleeve heat shield.

[0024] 5) The thermal insulation exhaust duct system according to 1), wherein the second exhaust duct comprises:

[0025] The second exhaust pipe body is connected to the second heat insulation layer of the heat insulation sleeve and is separated from the second heat insulation sleeve heat shield through the second heat insulation layer. The second exhaust pipe body has a first diameter.

[0026] The end portion of the second exhaust pipe includes:

[0027] The second exhaust pipe flange is adjacent to the body of the second exhaust pipe; and

[0028] The second exhaust pipe collar is adjacent to the second exhaust pipe flange and separated from the second exhaust pipe body by the second exhaust pipe flange. The second exhaust pipe collar has a second diameter that is larger than the first diameter.

[0029] 6) The heat-insulating exhaust pipe system according to 1), wherein the end portion of the second exhaust pipe is connected to the first exhaust pipe and the first heat-insulating sleeve insulation layer.

[0030] 7) The thermal insulation exhaust duct system according to 2), wherein the end portion of the first exhaust duct includes a radially extending end surface separate from the end of the thermal insulation layer of the first thermal insulation sleeve.

[0031] 8) The thermally insulated exhaust duct system according to 1), wherein the first exhaust duct and the first thermal insulation sleeve cooperate to define a channel, the channel being configured to receive an end portion of the second exhaust duct.

[0032] 9) The thermal insulation exhaust duct system according to 8), wherein the channel is configured to receive the end portion of the second exhaust duct, such that a portion of the first thermal insulation sleeve is disposed around a portion of the main body of the second exhaust duct before the end portion of the second exhaust duct.

[0033] 10) The thermally insulated exhaust duct system according to 1) further includes an exhaust duct clamp, the exhaust duct clamp including a connecting portion that connects the ends of the exhaust duct clamp to each other, the exhaust duct clamp being configured to secure the first exhaust duct to the second exhaust duct.

[0034] 11) The thermal insulation exhaust duct system according to 10), wherein the first thermal insulation sleeve includes a cut-out portion at which the connecting portion of the exhaust duct clamp is exposed from the first thermal insulation sleeve.

[0035] 12) The heat-insulating exhaust pipe system according to 1), wherein the first heat-insulating sleeve heat-shielding member comprises:

[0036] The main body of the first heat-insulating sleeve heat shield is in contact with the heat insulation layer of the first heat-insulating sleeve, and is separated from the first exhaust pipe through the heat insulation layer of the first heat-insulating sleeve; and

[0037] The end portion of the first heat insulation sleeve heat shield is in contact with the heat insulation layer of the first heat insulation sleeve and extends from the body of the first heat insulation sleeve heat shield toward the first exhaust pipe.

[0038] 13) The heat-insulating exhaust duct system according to 12), wherein the second heat-insulating sleeve heat shield includes:

[0039] The main body of the second heat-insulating sleeve heat shield is in contact with the heat insulation layer of the second heat-insulating sleeve, and is separated from the second exhaust pipe through the heat insulation layer of the second heat-insulating sleeve; and

[0040] The end portion of the second heat insulation sleeve heat shield is in contact with the heat insulation layer of the second heat insulation sleeve and extends from the body of the second heat insulation sleeve heat shield toward the second exhaust pipe. The end portion of the second heat insulation sleeve heat shield is facing the end portion of the first heat insulation sleeve heat shield.

[0041] 14) In another embodiment, the thermally insulated exhaust duct system includes a first exhaust duct, a second exhaust duct, a first thermal insulation layer, a second thermal insulation layer, a first heat shield, a second heat shield, and an exhaust duct clamp. The first exhaust duct has a first exhaust duct end portion. The second exhaust duct has a second exhaust duct end portion configured to engage with the first exhaust duct end portion at a joint. The second exhaust duct end portion includes a flange configured to overlap with the first exhaust duct end portion at the joint. The first thermal insulation layer is disposed on the first exhaust duct. The first thermal insulation layer extends beyond the first exhaust duct end portion. The second thermal insulation layer is disposed on the second exhaust duct. The second thermal insulation layer terminates before the second exhaust duct end portion, such that the second exhaust duct end portion is exposed from the second thermal insulation layer. The first heat shield is disposed on the first thermal insulation layer. The second heat shield is disposed on the second thermal insulation layer. The exhaust duct clamp is configured to secure the first exhaust duct to the second exhaust duct at a joint. The exhaust duct clamp has a connecting portion that connects the ends of the exhaust duct clamps to each other. The cutouts in the first insulation layer and the first heat shield are configured to expose the connection portion.

[0042] 15) The thermally insulated exhaust duct system according to 14), wherein the first exhaust duct and the second exhaust duct have a first diameter, and the flange has a second diameter greater than the first diameter, such that the flange is configured to receive the end portion of the first exhaust duct when the second exhaust duct is connected to the first exhaust duct.

[0043] 16) The thermal insulation exhaust duct system according to 14), wherein the first heat shield includes a first end portion that covers a first end surface of the first insulation layer; and

[0044] The second heat shield includes a second end portion, which covers the second end surface of the second heat insulation layer and faces the first end portion.

[0045] 17) The heat-insulated exhaust pipe system according to 14) further includes a first mounting component and a second mounting component respectively disposed on the inner surface of the first exhaust pipe and the inner surface of the second exhaust pipe.

[0046] 18) The thermally insulated exhaust duct system according to 14), wherein the first exhaust duct and the first thermal insulation layer cooperate to define a channel, the channel being configured to receive an end portion of the second exhaust duct.

[0047] 19) The thermal insulation exhaust duct system according to 18), wherein the channel is configured such that a portion of the first thermal insulation layer is disposed around a portion of the main body of the second exhaust duct before the end portion of the second exhaust duct, and is configured to receive the exhaust duct clamp.

[0048] 20) In another embodiment, the thermally insulated exhaust duct system includes a first exhaust duct and a first thermally insulated sleeve. The first exhaust duct includes a first exhaust duct body and a first exhaust duct end portion. The first exhaust duct body is defined by a central axis. The first exhaust duct end portion is adjacent to the first exhaust duct body and extends from the first exhaust duct body toward the central axis. The first thermally insulated sleeve includes a first thermally insulated sleeve insulation layer and a first thermal shield. The first thermally insulated sleeve insulation layer includes a first thermally insulated sleeve insulation layer body and a first thermally insulated sleeve insulation layer end portion. The first thermally insulated sleeve insulation layer body is in a facing relationship with the first exhaust duct. The first thermally insulated sleeve insulation layer end portion is adjacent to the first thermally insulated sleeve insulation layer body and is separated from the first exhaust duct. The first thermal shield includes a first thermal shield body and a first thermal shield end portion. The first thermal shield body is in a facing relationship with the first thermally insulated sleeve insulation layer body and is separated from the first exhaust duct by the first thermally insulated sleeve insulation layer body. The end portion of the first heat shield is adjacent to the main body of the first heat shield and faces the end portion of the insulation layer of the first heat insulation sleeve, extending away from the main body of the first heat shield toward the central axis. The end portion of the first heat shield is separated from the end portion of the first exhaust pipe along the central axis, such that the end portion of the insulation layer of the first heat insulation sleeve extends along the central axis between the end portion of the first heat shield and the end portion of the first exhaust pipe. Brief description of the attached diagram

[0049] Details of one or more embodiments are set forth in the accompanying drawings and the following description. Other features, aspects, and advantages of this disclosure will become apparent from the description, the drawings, and the claims, as illustrated in the drawings:

[0050] Figure 1 This is a schematic block diagram of an example exhaust aftertreatment system;

[0051] Figure 2 and Figure 3 This is a cross-sectional view of an example insulated exhaust duct system;

[0052] Figure 4 It is used for Figure 2 and Figure 3 A perspective view of the first insulating sleeve of an example thermal insulation duct system shown;

[0053] Figure 5 It is used for Figure 2 and Figure 3A perspective view of an example second insulating sleeve of the thermal insulation exhaust duct system shown;

[0054] Figure 6 yes Figure 2 and Figure 3 The example insulated exhaust duct system shown is a side view;

[0055] Figure 7 yes Figure 6 A top view of detail A shown; and

[0056] Figure 8 This is a side view of an example insulated exhaust duct system.

[0057] It will be appreciated that, for illustrative purposes, some or all of the drawings are schematic representations. The drawings are provided to illustrate one or more embodiments, and it is clearly understood that they are not intended to limit the scope or meaning of the claims. Detailed description

[0058] The following is a more detailed description of various concepts related to methods, apparatus, and systems for insulating the exhaust pipes of internal combustion engines, and of implementation methods, apparatus, and systems for insulating the exhaust pipes of internal combustion engines. The various concepts described above and discussed in more detail below can be implemented in any of a variety of ways, as the described concepts are not limited to any particular implementation. Examples of specific implementations and applications are provided primarily for illustrative purposes.

[0059] I. Overview

[0060] In some vehicles, insulation materials are used to insulate the exhaust ducts (e.g., pipes or tubes) of exhaust aftertreatment systems. The joints of exhaust ducts are typically not insulated. If insulation is used around the joints, the insulation may be in separate pieces. However, these pieces are bulky and constitute additional maintenance. Therefore, using separate insulation pieces for joint coverage increases the time and cost of sourcing, manufacturing, and maintaining (installation and repair / replacement).

[0061] Furthermore, separate components may increase the overall space requirements of the system. Space requirements refer to the amount of physical space consumed by the exhaust aftertreatment system during installation (e.g., on a vehicle) and the location of that physical space (e.g., coordinates relative to the vehicle's coordinate system). In some applications, the physical space available to the exhaust aftertreatment system is limited due to the location of surrounding components, wiring or piping system requirements, or other similar constraints. Therefore, modifying the exhaust aftertreatment system is often difficult, as such modifications typically increase its space requirements. Such modifications may be necessary when it is desired to use various components (such as different types of dispensing modules) within the exhaust aftertreatment system.

[0062] To address this issue, the embodiments described herein provide an insulated exhaust duct system that allows for thermal insulation of the joints in and around the exhaust aftertreatment system without requiring separate manufacturing or maintenance components or processes, while minimizing space requirements.

[0063] According to some embodiments described herein, an insulated exhaust duct system is installed on a post-treatment system such that insulation material wraps around the exhaust duct (including the exhaust duct joint). This is achieved by extending existing insulation material and heat shielding at the joint. Maintaining a low profile for the extended insulation material and heat shielding reduces maintenance, creates a simpler installation process, and, importantly, allows for greater surface area insulation (including the exhaust duct joint). The insulated exhaust duct system includes a first exhaust duct, a second exhaust duct, a first insulation sleeve, and a second insulation sleeve. The first insulation sleeve has a first insulation layer and a first heat shield. The second insulation sleeve has a second insulation layer and a second heat shield. The first and second exhaust ducts are configured to be joined together. This joint is referred to herein as a joint. For ease of connection, the second exhaust duct includes a flange that is received by a channel within the first insulation sleeve. The first heat insulation sleeve's heat insulation layer and the first heat insulation sleeve's heat shield overlap with the flange, which overlaps with a portion of the first exhaust pipe, causing the first heat insulation sleeve's heat shield to meet the second heat insulation sleeve's heat shield. Therefore, the joint is heat-insulated.

[0064] By increasing the insulation area of ​​the aftertreatment system, the improved insulation capacity of the aftertreatment system is achieved, which leads to improved system performance. In addition, insulating the joints reduces heat dissipation to surrounding components (e.g., components surrounding the exhaust pipe in the engine system), improves radial space requirements, and reduces system maintenance time.

[0065] II. Overview of Exhaust Aftertreatment Systems

[0066] Figure 1An exhaust aftertreatment system 100 is depicted having an example reductant delivery system 110 for an exhaust piping system 190. The exhaust aftertreatment system 100 includes a particulate filter (e.g., a diesel particulate filter (DPF) 102), a reductant delivery system 110, a decomposition chamber or reactor pipe 104, an SCR catalyst 106, and a sensor 150.

[0067] DPF 102 is configured to remove particulate matter, such as soot, from exhaust gas flowing in exhaust duct system 190. DPF 102 includes an inlet and an outlet, receiving exhaust gas at the inlet, generally filtering particulate matter from the exhaust gas and / or converting particulate matter into carbon dioxide before discharging the exhaust gas at the outlet.

[0068] The decomposition chamber 104 is configured to convert a reducing agent (such as urea or diesel exhaust fluid (DEF)) into ammonia. The decomposition chamber 104 is associated with a reducing agent delivery system 110, which has a dispenser 112 configured to dispense the reducing agent into the decomposition chamber 104. In some embodiments, the reducing agent is injected upstream of the SCR catalyst 106. The reducing agent droplets then undergo evaporation, pyrolysis, and hydrolysis to form gaseous ammonia within the exhaust duct system 190. The decomposition chamber 104 includes an inlet and an outlet, the inlet being in fluid communication with the DPF 102 to receive NO. X The exhaust gas outlet is used to discharge exhaust gas and NO. X The emissions, ammonia, and / or residual reducing agent flow to SCR catalyst 106.

[0069] The decomposition chamber 104 includes a dispenser 112 mounted to it, such that the dispenser 112 can dispense a reducing agent into the exhaust gas flowing in the exhaust duct system 190. The dispenser 112 may include a heat shield 114 located between a portion of the dispenser 112 and the portion of the decomposition chamber 104 where the dispenser 112 is mounted. The dispenser 112 is fluidly coupled to one or more reducing agent sources 116. In some embodiments, a pump 118 may be used to pressurize the reducing agent from the reducing agent source 116 for delivery to the dispenser 112. In some embodiments, a filter assembly 117 may be positioned between the reducing agent source 116 and the dispenser 112. The filter assembly 117 may be upstream or downstream of the pump 118. In other embodiments, the filter assembly 117 may be integrated into the pump 118. In still other embodiments, the filter assembly 117 may be integrated into the dispenser 112 and / or the reducing agent source 116. The filter assembly 117 may include a filter housing, a filter medium, and one or more valves, as described in more detail below.

[0070] Dispenser 112 and pump 118 are also electrically or communicatively coupled to controller 120. In some embodiments, one or more valves may be electrically or communicatively coupled to controller 120. Controller 120 is configured to control dispenser 112 to dispense reducing agent into decomposition chamber 104. Controller 120 may also be configured to control pump 118 and / or filter assembly 117. Controller 120 may include a microprocessor, application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), etc., or a combination thereof. Controller 120 may include memory, which may include, but is not limited to, electronic, optical, magnetic, or any other storage or transmission device capable of providing program instructions to a processor, ASIC, FPGA, etc. Memory may include memory chips, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), flash memory, or any other suitable memory from which controller 120 can read instructions. Instructions may include code from any suitable programming language.

[0071] The SCR catalyst 106 is configured to help reduce NOx emissions by accelerating the NOx reduction process between ammonia and exhaust NOx to produce diatomic nitrogen, water, and / or carbon dioxide. The SCR catalyst 106 includes an inlet in fluid communication with a decomposition chamber 104 that receives exhaust gas and a reducing agent, and an outlet in fluid communication with the end of an exhaust duct system 190.

[0072] The exhaust duct system 190 may also include an oxidation catalyst, such as a diesel oxidation catalyst (DOC), in fluid communication with the exhaust duct system 190 (e.g., downstream of the SCR catalyst 106 or upstream of the DPF 102) to oxidize hydrocarbons and carbon monoxide in the exhaust.

[0073] In some embodiments, DPF 102 may be located downstream of the decomposition chamber or reactor tube 104. For example, DPF 102 and SCR catalyst 106 may be combined into a single unit, such as a DPF (SDPF) with an SCR coating. In some embodiments, dispenser 112 may alternatively be located downstream or upstream of the turbocharger.

[0074] Sensor 150 can be coupled to exhaust duct system 190 to detect the condition of exhaust gas flowing through exhaust duct system 190. In some embodiments, sensor 150 may have a portion disposed within exhaust duct system 190, for example, the tip of sensor 150 may extend into a portion of exhaust duct system 190. In other embodiments, sensor 150 may receive exhaust gas through another conduit (such as a sample tube extending from exhaust duct system 190). Although sensor 150 is depicted as being located downstream of SCR catalyst 106, it should be understood that sensor 150 may be located at any other location in exhaust duct system 190, including upstream of DPF 102, within DPF 102, between DPF 102 and decomposition chamber 104, within decomposition chamber 104, between decomposition chamber 104 and SCR catalyst 106, within SCR catalyst 106, or downstream of SCR catalyst 106.

[0075] III. Example of an insulated exhaust duct system

[0076] Figures 2-5 The illustration shows an insulated exhaust duct system 200 according to an example embodiment. As explained in more detail herein, the insulated exhaust duct system 200 is configured to provide thermal insulation (e.g., thermal isolation, etc.) to the joints (e.g., body joints, connecting joints, etc.) between two adjacent components of the exhaust aftertreatment system 100. For example, the insulated exhaust duct system 200 may provide thermal insulation to the joints between two adjacent exhaust pipes of the exhaust duct system 190. In this way, the insulated exhaust duct system 200 can mitigate heat transfer from exhaust generated by an internal combustion engine (e.g., a diesel internal combustion engine, a gasoline internal combustion engine, etc.) to components (e.g., wires, bushings, sensors, etc.) surrounding the insulated exhaust duct system 200. As a result, the effects of heat (e.g., melting of components, stretching of components, etc.) on the components surrounding the insulated exhaust duct system 200 can be minimized.

[0077] The thermally insulated exhaust duct system 200 includes a first thermally insulated sleeve 202. The first thermally insulated sleeve 202 is disposed around a first exhaust duct 204 of the exhaust duct system 190 (e.g., overlapping around the first exhaust duct 204, wrapping around the first exhaust duct 204, covering the first exhaust duct 204, overlapping with the first exhaust duct 204, etc.). As explained in more detail herein, the first thermally insulated sleeve 202 is configured to thermally insulate the first exhaust duct 204 such that heat transfer from exhaust contained within (e.g., flowing through) the first exhaust duct 204 and exiting the first thermally insulated sleeve 202 is reduced.

[0078] The first insulation sleeve 202 includes a first insulation sleeve insulation layer 206. As explained in more detail herein, the first insulation sleeve insulation layer 206 is configured to reduce heat transfer from exhaust gas contained in the first exhaust duct 204 leaving the insulated exhaust duct system 200 (e.g., toward components adjacent to the first exhaust duct 204 toward the exhaust aftertreatment system 100).

[0079] The first thermal insulation sleeve insulation layer 206 includes a first thermal insulation sleeve insulation layer body 207. The first thermal insulation sleeve insulation layer body 207 is disposed around a portion of the first exhaust duct 204. In applications where the first exhaust duct 204 is generally cylindrical, the first thermal insulation sleeve insulation layer body 207 may also be generally cylindrical.

[0080] The first heat insulation sleeve insulation layer 206 also includes a first heat insulation sleeve insulation layer end 208. The first heat insulation sleeve insulation layer end 208 is adjacent to the first heat insulation sleeve insulation layer body 207. The first heat insulation sleeve insulation layer end 208 extends axially away from the first heat insulation sleeve insulation layer body 207 (e.g., extending along an axis parallel to the central axis of the first heat insulation sleeve insulation layer body 207). Unlike the first heat insulation sleeve insulation layer body 207, the first heat insulation sleeve insulation layer end 208 is separate from the first exhaust pipe 204 (e.g., not in contact with the first exhaust pipe 204, spaced apart from the first exhaust pipe 204, etc.).

[0081] The end 208 of the first insulation sleeve insulation layer includes an end surface 209 (e.g., an end face). The end surface 209 of the first insulation sleeve insulation layer is a radially extending end surface (e.g., the end surface 209 of the first insulation sleeve insulation layer extends toward the first exhaust pipe 204, etc.).

[0082] The end 208 of the first insulation sleeve insulation layer is defined by a length Q. In various embodiments, the length Q is approximately between 1 inch and 3 inches, including 1 inch and 3 inches (e.g., 0.95 inches, 1 inch, 1.5 inches, 2 inches, 3 inches, 3.05 inches, etc.). In various embodiments, the length Q is approximately between 1 inch and 6 inches, including 1 inch and 6 inches (e.g., 3 inches, 4.05 inches, 5.5 inches, etc.). In various embodiments, the length Q is approximately between 1 inch and 10 inches, including 1 inch and 10 inches (e.g., 0.95 inches, 2.5 inches, 7 inches, 9.95 inches, etc.). In other words, the end 208 of the first insulation sleeve insulation layer is separated from the first exhaust duct 204 along the length Q.

[0083] The first exhaust pipe 204 includes a first exhaust pipe body 210. The first exhaust pipe body 210 is connected to the first insulation sleeve insulation layer body 207. In various embodiments, the first exhaust pipe body 210 is cylindrical.

[0084] The first exhaust conduit 204 also includes a first exhaust conduit end portion 211. The first exhaust conduit end portion 211 is adjacent to the first exhaust conduit body 210. The first exhaust conduit end portion 211 extends axially away from the first exhaust conduit body 210. In various embodiments, the first exhaust conduit end portion 211 further extends radially away from the first exhaust conduit body 210 (e.g., toward the central axis of the first exhaust conduit body 210, etc.).

[0085] The first exhaust pipe end portion 211 includes a first exhaust pipe end surface 212 (e.g., an end face, etc.). The first exhaust pipe end surface 212 is a radially extending end surface (e.g., the first exhaust pipe end surface 212 extends away from the end 208 of the first insulation sleeve insulation layer, etc.).

[0086] The end surface 209 of the first insulation sleeve extends beyond the end surface 212 of the first exhaust pipe by an overhang distance G. In other words, the end surface 209 of the first insulation sleeve extends axially beyond the first exhaust pipe 204 by an overhang distance G. In various embodiments, the overhang distance G is approximately equal to (e.g., within 5%, equal to, etc.) between 0.25 inches and 2 inches, including 0.25 inches and 2 inches (e.g., 0.23 inches, 0.25 inches, 0.5 inches, 1 inch, 2 inches, 2.05 inches, etc.).

[0087] The first insulation sleeve insulation layer 206 includes an insulation sleeve insulation layer recess 213. The insulation sleeve insulation layer recess 213 abuts against the end surface 209 of the first insulation sleeve insulation layer and extends beyond the end portion 211 of the first exhaust pipe and extends along the first exhaust pipe 204 away from the end portion 208 of the first insulation sleeve insulation layer for a length Q. In various embodiments, the length Q is approximately equal to, and inclusive of, 2G and 5G. The insulation sleeve insulation layer recess 213 cooperates with the first exhaust pipe 204 to form a channel 214 (e.g., a groove, notch, etc.). The channel 214 is a gap (e.g., cavity, clearance, etc.) between the end portion 208 of the first insulation sleeve insulation layer and the first exhaust pipe 204 (e.g., the first exhaust pipe body 210, the end portion 211 of the first exhaust pipe, etc.).

[0088] The length Q minus the overhang distance G equals the distance I. As explained in more detail herein, the distance I can be related to the width of the clamp used to connect the first exhaust pipe 204 to the second exhaust pipe. In other words, the clamp can be selected such that the width of the clamp is less than the distance I.

[0089] The first thermal insulation sleeve 202 also includes a first thermal insulation sleeve heat shield 216 (e.g., wrapping, covering, skin, shell, etc.). The first thermal insulation sleeve heat shield 216 is configured to further reduce heat transfer from the exhaust gas contained in the first exhaust duct 204 leaving the thermal insulation exhaust duct system 200.

[0090] The first heat insulation sleeve heat shield 216 includes a first heat insulation sleeve heat shield body 217. The first heat insulation sleeve heat shield body 217 is disposed around the first heat insulation sleeve heat insulation layer body 207 and the first heat insulation sleeve heat insulation layer end 208. The first heat insulation sleeve heat shield body 217 is separated from the first exhaust pipe 204 through the first heat insulation sleeve heat insulation layer 206.

[0091] The first heat insulation sleeve heat shield 216 also includes a first heat insulation sleeve heat shield end portion 218. The first heat insulation sleeve heat shield end portion 218 is adjacent to the first heat insulation sleeve heat shield body 217.

[0092] The end portion 218 of the first heat insulation sleeve heat shield extends away from the main body 217 of the first heat insulation sleeve heat shield.

[0093] The end portion 218 of the first heat insulation sleeve heat shield is a radially extending end portion.

[0094] The end portion 218 of the first heat insulation sleeve heat shield is in contact with the end surface 209 of the first heat insulation sleeve heat insulation layer. As a result, the first heat insulation sleeve heat insulation layer 206 is at least partially enclosed (e.g., covered) by the first heat insulation sleeve heat shield 216.

[0095] The first insulating sleeve 202 is configured to receive a second exhaust duct 220 of the exhaust duct system 190. The second exhaust duct 220 includes a second exhaust duct body 221. In various embodiments, the second exhaust duct body 221 is cylindrical.

[0096] The second exhaust conduit 220 also includes a second exhaust conduit end portion 222. The second exhaust conduit end portion 222 is adjacent to the second exhaust conduit body 221. The second exhaust conduit end portion 222 extends axially from the second exhaust conduit body 221 away from the second exhaust conduit body 221. In various embodiments, the second exhaust conduit end portion 222 further extends radially away from the second exhaust conduit body 221 (e.g., away from the central axis of the second exhaust conduit body 221, etc.).

[0097] The end portion 222 of the second exhaust pipe includes a second exhaust pipe flange 223. The second exhaust pipe flange 223 is adjacent to and extends away from the second exhaust pipe body 221. The second exhaust pipe flange 223 has a diameter that increases with the distance from the second exhaust pipe body 221.

[0098] The second exhaust pipe end portion 222 includes a second exhaust pipe collar 224. The second exhaust pipe collar 224 is adjacent to and separated from the second exhaust pipe body 221 by the second exhaust pipe flange 223. The second exhaust pipe collar 224 has a constant or substantially constant diameter (e.g., the maximum diameter of the second exhaust pipe collar 224 is approximately equal to between 105% and 95% of the minimum diameter of the second exhaust pipe collar 224, including both 105% and 95% of the minimum diameter of the second exhaust pipe collar 224).

[0099] The diameter of the second exhaust pipe collar 224 is larger than that of the first exhaust pipe body 210. The axial length of the second exhaust pipe collar 224 (e.g., along an axis parallel to the central axis of the second exhaust pipe body 221) is greater than or approximately equal to the distance I.

[0100] The second exhaust pipe end portion 222 also includes a second exhaust pipe end surface 225 (e.g., an end face). The second exhaust pipe end surface 225 is a radially extending end surface.

[0101] The thermally insulated exhaust duct system 200 also includes a second thermally insulated sleeve 226. The second thermally insulated sleeve 226 is disposed around the second exhaust duct 220 (e.g., overlapping around the second exhaust duct 220, wrapping around the second exhaust duct 220, covering the second exhaust duct 220, overlapping with the second exhaust duct 220, etc.). As explained in more detail here, the second thermally insulated sleeve 226 is configured to thermally insulate the second exhaust duct 220 such that heat transfer from exhaust contained within the second exhaust duct 220 (e.g., flowing through the second exhaust duct 220, etc.) leaving the second thermally insulated sleeve 226 is reduced.

[0102] The second insulation sleeve 226 includes a second insulation sleeve insulation layer 227. As explained in more detail herein, the second insulation sleeve insulation layer 227 is configured to reduce heat transfer from exhaust gas contained in the second exhaust duct 220 leaving the insulated exhaust duct system 200 (e.g., toward components adjacent to the second exhaust duct 220 toward the exhaust aftertreatment system 100).

[0103] The second insulation sleeve insulation layer 227 includes an end surface 228 (e.g., an end face). The end surface 228 of the second insulation sleeve insulation layer is separated from the end surface 225 of the second exhaust pipe by an overhang distance H, which is greater than the length Q.

[0104] The second insulation sleeve 226 also includes a second insulation sleeve heat shield 230 (e.g., wrapping, covering, outer skin, shell, etc.). The second insulation sleeve heat shield 230 is configured to further reduce heat transfer from exhaust gas contained in the second exhaust duct 220 leaving the insulation exhaust duct system 200.

[0105] The second heat insulation sleeve heat shield 230 includes a second heat insulation sleeve heat shield body 232. The second heat insulation sleeve heat shield body 232 is disposed around the second heat insulation sleeve heat insulation layer 227. The second heat insulation sleeve heat shield body 232 is separated from the second exhaust pipe 220 through the second heat insulation sleeve heat insulation layer 227.

[0106] The second heat insulation sleeve heat shield 230 also includes a second heat insulation sleeve heat shield end portion 234. The second heat insulation sleeve heat shield end portion 234 is adjacent to the second heat insulation sleeve heat shield body 232.

[0107] The end portion 234 of the second heat insulation sleeve heat shield extends away from the main body 232 of the second heat insulation sleeve heat shield.

[0108] The end portion 234 of the second heat insulation sleeve heat shield is a radially extending end portion.

[0109] In various embodiments, the end portion 234 of the second heat-insulating sleeve heat shield is in contact with the end surface 228 of the second heat-insulating sleeve heat insulation layer. As a result, the second heat-insulating sleeve heat insulation layer 227 is at least partially enclosed (e.g., covered) by the second heat-insulating sleeve heat shield 230.

[0110] The first heat insulation sleeve 202 is configured to engage with the second heat insulation sleeve 226 (e.g., connected to, facing, adjacent to, adjacent to, attached to, connected to the second heat insulation sleeve 226, etc.), such that the first heat insulation sleeve 202 receives the second heat insulation sleeve 226. When the first heat insulation sleeve 202 engages with the second heat insulation sleeve 226, the second exhaust pipe end portion 222 is received between the first heat insulation sleeve insulation layer end portion 208 and the first exhaust pipe 204 (e.g., the first exhaust pipe body 210, the first exhaust pipe end portion 211, etc.), and the first heat insulation sleeve heat shield end portion 218 faces the second heat insulation sleeve heat shield end portion 234 (e.g., connected to, adjacent to the second heat insulation sleeve heat shield end portion 234, etc.). The second heat insulation sleeve 226 is inserted into the first heat insulation sleeve 202, such that the end portion 218 of the heat shield of the first heat insulation sleeve and the end portion 234 of the heat shield of the second heat insulation sleeve are facing each other (e.g., the overlap distance Q between the heat insulation layer 206 of the first heat insulation sleeve and the second exhaust pipe 220).

[0111] During operation, when the first heat insulation sleeve 202 engages with the second heat insulation sleeve 226, the end portion 222 of the second exhaust pipe is inserted into the channel 214, and when the first heat insulation sleeve 202 engages with the second heat insulation sleeve 226, the end portion 234 of the heat shield of the second heat insulation sleeve and the end portion 218 of the heat shield of the first heat insulation sleeve are in a facing relationship (for example, such that the portion of the second exhaust pipe body 221 located between the end portion 234 of the heat shield of the second heat insulation sleeve and the second exhaust pipe collar 224 is at least partially covered by the end portion 208 of the heat insulation layer of the first heat insulation sleeve).

[0112] In various embodiments, the thermally insulated exhaust duct system 200 may further include a first mounting member 238. The first mounting member 238 is inserted into the first exhaust duct 204 such that it is positioned along a portion of the inner surface of the first exhaust duct 204 (e.g., the first mounting member 238 is generally cylindrical, etc.). The first mounting member 238 is coupled (e.g., fastened, attached, etc.) to the first exhaust duct 204. The first mounting member 238 engages with and separates the first catalyst body 243 from the first exhaust duct 204 as described herein. Thus, the first mounting member 238 is configured to retain the first catalyst body 243 within the first exhaust duct 204. The first mounting member 238 is also configured to reduce heat transfer from exhaust gas contained within the first exhaust duct 204 leaving the thermally insulated exhaust duct system 200. In some embodiments, the first mounting member 238 includes a first mounting member end 240 adjacent to the end portion 211 of the first exhaust duct.

[0113] In various embodiments, the thermally insulated exhaust duct system 200 may further include a second mounting member 242. The second mounting member 242 is inserted into the second exhaust duct 220 such that it is positioned along a portion of the inner surface of the second exhaust duct 220 (e.g., the second mounting member 242 is generally cylindrical). The second mounting member 242 is coupled (e.g., fastened, attached, etc.) to the second exhaust duct 220. The second mounting member 242 engages with and separates the second catalyst body 245 from the second exhaust duct 220 as described herein. Therefore, the second mounting member 242 is configured to retain the second catalyst body 245 within the second exhaust duct 220. The second mounting member 242 is also configured to reduce heat transfer from the exhaust gas contained within the second exhaust duct 220 leaving the thermally insulated exhaust duct system 200. In some embodiments, the second mounting member 242 includes a second mounting member end 244 adjacent to the second exhaust duct collar 224.

[0114] In various embodiments, the insulated exhaust duct system 200 further includes a first catalyst body 243. The first catalyst body 243 is inserted into the first exhaust duct 204. In embodiments where the insulated exhaust duct system 200 includes a first mounting member 238, the first catalyst body 243 is inserted into the first mounting member 238. The first catalyst body 243 may be made of various ceramic materials (e.g., titanium oxide, etc.) and is configured to facilitate NO reduction. X Reduction of emissions.

[0115] In various embodiments, the insulated exhaust duct system 200 further includes a second catalyst body 245. The second catalyst body 245 is inserted into the second exhaust duct 220. In embodiments where the insulated exhaust duct system 200 includes a second mounting member 242, the second catalyst body 245 is inserted into the second mounting member 242. The second catalyst body 245 may be made of various ceramic materials (e.g., titanium oxide, etc.) and is configured to facilitate NO reduction. X Reduction of emissions.

[0116] like Figure 2 and Figure 3 As shown, in some embodiments, a gap 246 is formed between the first mounting member 238 and the second mounting member 242 and / or between the first catalyst body 243 and the second catalyst body 245. The gap 246 is formed when the first heat insulation sleeve 202 and the second heat insulation sleeve 226 are engaged.

[0117] In some embodiments, the thermally insulated exhaust duct system 200 further includes a seal 248 (e.g., an O-ring, etc.). The seal 248 is located between the second exhaust duct end portion 222 and the first exhaust duct end portion 211. For example, the seal 248 may be located between the first exhaust duct end portion 211 and the second exhaust duct flange 223. Compression of the seal 248 between the second exhaust duct end portion 222 and the first exhaust duct end portion 211 can establish a seal between the second exhaust duct end portion 222 and the seal 248, as well as a seal between the first exhaust duct end portion 211 and the seal 248. In various embodiments, the thermally insulated exhaust duct system 200 does not include the seal 248.

[0118] In various embodiments, the insulated exhaust duct system 200 further includes an exhaust duct clamp 250. The exhaust duct clamp 250 is configured to secure the first exhaust duct 204 and the second exhaust duct 220 when the first insulation sleeve 202 engages with the second insulation sleeve 226. Furthermore, the exhaust duct clamp 250 can mitigate exhaust flow from the exhaust aftertreatment system 100 between the first exhaust duct 204 and the second exhaust duct 220 by biasing the second exhaust duct end portion 222 toward the first exhaust duct 204, thereby causing compression of the seal 248 between the second exhaust duct 220 and the first exhaust duct 204 (e.g., between the second exhaust duct collar 224 and the first exhaust duct end portion 211, between the second exhaust duct end portion 222 and the first exhaust duct end portion 211, and between the second exhaust duct end portion 222 and the first exhaust duct 204).

[0119] An exhaust pipe clamp 250 is positioned around the second exhaust pipe end portion 222 (e.g., at the second exhaust pipe collar 224). When the second insulating sleeve 226 engages with the first insulating sleeve 202, the exhaust pipe clamp 250 is received within the channel 214. The exhaust pipe clamp 250 is tightened to bias the second exhaust pipe end portion 222 toward the first exhaust pipe 204, thereby inducing compression at the seal 248 between the second exhaust pipe collar 224 and the first exhaust pipe end portion 211, between the second exhaust pipe end portion 222 and the first exhaust pipe end portion 211, and between the second exhaust pipe end portion 222 and the first exhaust pipe 204.

[0120] In various embodiments, the exhaust pipe clamp 250 is a band clamp. The dimensions of the exhaust pipe clamp 250 or band clamp depend on the dimensions of the first exhaust pipe 204 and the second exhaust pipe 220. In various embodiments, the diameter may be approximately between 3 inches and 6 inches, including 3 inches and 6 inches (e.g., 4 inches, 4.5 inches, 5 inches, etc.). In various embodiments, the diameter may be approximately between 3 inches and 14 inches, including 3 inches and 14 inches (e.g., 6 inches, 13 inches, 13.5 inches, 14 inches, etc.). In various embodiments, the exhaust pipe clamp 250 may be an overlap band clamp, a hanger clamp, a narrow band clamp, a U-clamp, etc. In various embodiments, the exhaust pipe clamp 250 includes a connecting portion 252. The connecting portion 252 is configured to connect the ends of the exhaust pipe clamp 250 to each other.

[0121] Now for reference Figures 6-8 The connection portion 252 is illustrated according to an example embodiment. In various embodiments, the first thermal insulation sleeve 206 includes a cutout portion 254. The cutout portion 254 is located on the surface of the first thermal insulation sleeve 206 and aligns with the connection portion 252 when the exhaust pipe clamp 250 is engaged with the second exhaust pipe collar 224 and positioned above the channel 214. In these embodiments, the cutout portion 254 is a void with a defined area in the first thermal insulation sleeve 206, having a length L (e.g., longer than the length of the T-bolt of the exhaust pipe clamp 250) and a distance Q. In various embodiments, the length of the T-bolt can be approximately between 1 inch and 4 inches, including 1 inch and 4 inches (e.g., 3 inches, 3.5 inches, etc.). Therefore, the cutout portion 254 is configured to receive a portion of the exhaust pipe clamp 250 (e.g., the connection portion 252) when the second thermal insulation sleeve 226 engages with the first thermal insulation sleeve 202.

[0122] In various embodiments, the first heat insulation sleeve heat shield 216 may include a second cut portion 254 aligned with the first cut portion 254 of the first heat insulation sleeve heat insulation layer 206.

[0123] In various embodiments, the first heat-insulating sleeve heat shield 216 and the second heat-insulating sleeve heat shield 230 are configured such that when the second heat-insulating sleeve 226 is engaged with the first heat-insulating sleeve 202, a target gap 256 exists between the end portion 218 of the first heat-insulating sleeve heat shield and the end portion 234 of the second heat-insulating sleeve heat shield.

[0124] like Figure 4 and Figure 6As shown, the first heat-insulating sleeve heat shield 216 and the second heat-insulating sleeve heat shield 230 are configured such that when the second heat-insulating sleeve 226 is engaged with the first heat-insulating sleeve 202, the target gap 256 between the end portions 218 and 234 of the first heat-insulating sleeve heat shield is at least partially rectangular or square. This configuration of the target gap 256 can be achieved by arranging the end portions 218 of the first heat-insulating sleeve heat shield along a plane parallel to the plane along which the end portions 234 of the second heat-insulating sleeve heat shield are arranged. Therefore, the end portions 218 and 234 of the first heat-insulating sleeve heat shield can be configured to be joined along a plane, thereby increasing the cross-sectional area of ​​the target gap 256.

[0125] like Figure 5 and Figure 8 As shown, the first heat-insulating sleeve heat shield 216 and the second heat-insulating sleeve heat shield 230 are configured such that when the second heat-insulating sleeve 226 is engaged with the first heat-insulating sleeve 202, the target gap 256 between the end portions 218 and 234 of the first heat-insulating sleeve heat shield is not partially rectangular or square (e.g., the target gap 256 is partially arcuate, partially circular, etc.). This can be achieved by arranging the end portions 218 of the first heat-insulating sleeve heat shield along a curve having a radius approximately equal to the radius of the curve along which the end portions 234 of the second heat-insulating sleeve heat shield are arranged. Therefore, the end portions 218 and 234 of the first heat-insulating sleeve heat shield can be configured to meet at their edges, thereby reducing the cross-sectional area of ​​the target gap 256.

[0126] Generally, the first insulation sleeve insulation layer 206 and the second insulation sleeve insulation layer 227, as well as the first insulation sleeve heat shield 216 and the second insulation sleeve heat shield 230, insulate the first exhaust pipe 204 and the second exhaust pipe 220, so that even the joint (e.g., between the first exhaust pipe 204 and the second exhaust pipe 220) is insulated, without requiring separate manufacturing, maintenance, or processes. By eliminating the need for separate manufacturing, maintenance, and processes, the costs and time associated with insulating the first exhaust pipe 204 and the second exhaust pipe 220 are reduced. For example, by reducing the number of components required to insulate the two exhaust pipes, the costs and time requirements for manufacturing, installation, maintenance, replacement, etc., can be reduced. In addition, by insulating the joint of the first exhaust pipe 204 and the second exhaust pipe 220, heat loss and pressure loss within the exhaust aftertreatment system 100 can be reduced, thereby improving the efficiency of the exhaust aftertreatment system 100.

[0127] In various embodiments, the first insulation sleeve insulation layer 206 and the second insulation sleeve insulation layer 227 can be grooved pipes. For example, the grooved pipe can open at a groove along the length-wise center of the pipe and slide around the first exhaust pipe 204 and the second exhaust pipe 220, such that once the grooved pipe is in place around the first exhaust pipe 204 and the second exhaust pipe 220, the groove closes again. The grooved pipe simplifies the installation of the first insulation sleeve insulation layer 206 and the second insulation sleeve insulation layer 227.

[0128] In various embodiments, the first heat insulation sleeve insulation layer 206 and the second heat insulation sleeve insulation layer 227 may include fibrous materials (e.g., glass fiber insulation wrapping, ceramic fiber wrapping, etc.). In various embodiments, the first heat insulation sleeve insulation layer 206 and the second heat insulation sleeve insulation layer 227 may include an elastomeric coating. The first heat insulation sleeve insulation layer 206 and the second heat insulation sleeve insulation layer 227 may be formed as a single insulation element or multiple insulation elements. One or more insulation elements may be cut into various lengths and sizes to fit the target dimensions of the first exhaust duct 204 and / or the second exhaust duct 220. Similarly, the first heat insulation sleeve heat shield 216 and the second heat insulation sleeve heat shield 230 may be formed as a single element or multiple elements.

[0129] As described herein, by positioning the first heat-insulating sleeve insulation layer 206 and the second heat-insulating sleeve insulation layer 227 above the first exhaust pipe 204 and the second exhaust pipe 220 (e.g., at the joint between the first exhaust pipe 204 and the second exhaust pipe 220), the thermal insulation capacity (e.g., heat insulation, etc.) of the exhaust aftertreatment system 100 is greater than that of other systems that do not include such an insulation system. By improving thermal insulation, the performance of the exhaust aftertreatment system 100 and / or the performance of the internal combustion engine associated with the exhaust aftertreatment system 100 can be improved. Furthermore, thermal insulation of the joint between the first exhaust pipe 204 and the second exhaust pipe 220 reduces heat loss to surrounding components, improves radial space requirements, and reduces system maintenance time. In addition, as described herein, the first heat-insulating sleeve insulation layer 206 and the second heat-insulating sleeve insulation layer 227, as well as the first heat-insulating sleeve heat shield 216 and the second heat-insulating sleeve heat shield 230, can be used with piping systems upstream or downstream of the aftertreatment system. For example, the first heat insulation sleeve heat insulation layer 206 and the second heat insulation sleeve heat insulation layer 227, as well as the first heat insulation sleeve heat shield 216 and the second heat insulation sleeve heat shield 230, can be applied to a common piping system between the aftertreatment system and the engine to similarly reduce heat loss / improve performance.

[0130] IV. Construction of Example Implementations

[0131] While this specification contains many specific implementation details, these should not be construed as limiting the scope of the claims, but rather as descriptions of features specific to particular implementations. Some features described in the context of individual implementations may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations. Furthermore, although features may be described above as functioning in certain combinations, or even initially claimed in this way, in some cases one or more features from the claimed combination may be removed from that combination, and the claimed combination may be for sub-combinations or variations thereof.

[0132] Similarly, although operations are depicted in a specific order in the accompanying drawings, this should not be construed as requiring these operations to be performed in the specific order shown or sequentially, or requiring all illustrated operations to be performed to obtain the desired result. In some cases, the separation of various system components in the embodiments described above should not be construed as requiring such separation in all embodiments, and it should be understood that the described components and systems can generally be integrated into a single product or packaged into multiple products embodied in a tangible medium.

[0133] As used herein, the terms “generally,” “typically,” and similar terms are intended to have a broad meaning consistent with common and accepted usage by one of ordinary skill in the art to which the subject matter of this disclosure pertains. Those skilled in the art who review this disclosure will understand that these terms are intended to allow for the description of certain features described and claimed, without limiting the scope of those features to the precise numerical ranges provided. Therefore, these terms should be interpreted as indicating that non-substantial or irrelevant modifications or alterations to the described and claimed subject matter are considered to be within the scope of this disclosure as set forth in the appended claims. Furthermore, it should be noted that the absence of the term “means” in the claims should not be construed as constituting a “means plus function” limitation under U.S. patent law.

[0134] As used herein, the terms “connection” and “joining” mean that two components are directly or indirectly linked together. Such connection can be fixed (e.g., permanent) or movable (e.g., removable or releasable). Such connection can be achieved by integrating two components or two components and any additional intermediate components into a single unit or by attaching or joining two components or two components and any additional intermediate components to each other.

[0135] As used herein, the term "fluid connection" refers to two components or objects having a pathway formed between them, through which fluids (such as water, air, gaseous reducing agents, gaseous ammonia, etc.) can flow, with or without intermediate components or objects. Examples of fluid connections or configurations used to achieve fluid communication may include piping systems, channels, or any other suitable components used to allow fluid to flow from one component or object to another.

[0136] It is important to note that the construction and arrangement of the systems shown in the various exemplary embodiments are illustrative in nature only, and not restrictive. Protection is intended for all variations and modifications within the spirit and / or scope of the described embodiments. It should be understood that some features may not be essential, and embodiments lacking various features may be contemplated within the scope of this application, defined by the appended claims. When reading the claims, it is intended that when words such as “a,” “an,” “at least one,” or “at least a portion” are used, there is no intention to limit the claim to only one item, unless specifically stated to the contrary in the claim. When the language “at least a portion” and / or “a portion” is used, the item may include a portion and / or the entire item, unless specifically stated to the contrary.

Claims

1. A thermally insulated exhaust duct system, comprising: A first exhaust pipe, having a first exhaust pipe end portion; A second exhaust pipe having a second exhaust pipe end portion configured to connect to a first exhaust pipe end portion at a joint, the second exhaust pipe end portion including a flange configured to overlap with the first exhaust pipe end portion at the joint; A first heat insulation layer is disposed on the first exhaust pipe, wherein the first heat insulation layer extends beyond the end portion of the first exhaust pipe; A second heat insulation layer is disposed on the second exhaust pipe, wherein the second heat insulation layer ends before the end portion of the second exhaust pipe, such that the end portion of the second exhaust pipe is exposed from the second heat insulation layer. A first heat shield is disposed on the first heat insulation layer; The second heat shield is disposed on the second heat insulation layer; as well as An exhaust pipe clamp is configured to secure a first exhaust pipe to a second exhaust pipe at the joint, the exhaust pipe clamp having a connecting portion that connects the ends of the exhaust pipe clamp to each other, wherein a portion of the connecting portion of the exhaust pipe clamp is located in a cutout portion of the first heat insulation layer and the first heat shield, and wherein the portion of the exhaust pipe clamp other than the connecting portion is covered by the first heat insulation layer.

2. The thermal insulation exhaust duct system according to claim 1, wherein, The first exhaust pipe and the second exhaust pipe have a first diameter, and the flange has a second diameter greater than the first diameter, such that the flange is configured to receive the end portion of the first exhaust pipe when the second exhaust pipe is connected to the first exhaust pipe.

3. The heat-insulated exhaust duct system according to claim 1, The first heat shield includes a first end portion, which covers the first end surface of the first heat insulation layer; and The second heat shield includes a second end portion, which covers the second end surface of the second heat insulation layer and faces the first end portion.

4. The thermal insulation exhaust duct system according to any one of claims 1 to 3 further includes a first mounting component and a second mounting component respectively disposed on the inner surface of the first exhaust duct and the inner surface of the second exhaust duct.

5. The thermally insulated exhaust duct system according to any one of claims 1 to 3, wherein, The first exhaust duct and the first insulation layer cooperate to define a channel, which is configured to receive the end portion of the second exhaust duct.

6. The thermal insulation exhaust duct system according to claim 5, wherein, The channel is configured such that a portion of the first insulation layer is disposed around a portion of the main body of the second exhaust pipe before the end portion of the second exhaust pipe, and is configured to receive the exhaust pipe clamp.

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