Post-processing device
By employing airflow channels and a double-layer insulation structure in the engine aftertreatment device, the problems of poor insulation effect and high cost of insulation cotton are solved, achieving better insulation performance and cost-effectiveness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEICHAI POWER CO LTD
- Filing Date
- 2025-05-19
- Publication Date
- 2026-04-21
AI Technical Summary
Existing engine aftertreatment devices have limited heat insulation properties and are costly.
By using air channels instead of insulation cotton, and taking advantage of the low thermal conductivity and heat convection effect of air, combined with a double-layer insulation structure, including air channels and insulation layers, the insulation effect is improved and the cost is reduced.
It improves the heat insulation effect, reduces the risk of heat damage, and also reduces material costs.
Smart Images
Figure CN224149664U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of engine aftertreatment technology, and specifically relates to an aftertreatment device. Background Technology
[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.
[0003] Currently, the engine aftertreatment system commonly used includes an inner shell, an intermediate shell, and an outer shell. Insulation cotton is placed between the inner shell and the intermediate shell, and between the intermediate shell and the outer shell, to achieve the effect of heat insulation.
[0004] However, the insulation effect of the insulation cotton in this post-treatment device is limited, and the insulation cotton is expensive. Utility Model Content
[0005] This utility model aims to at least partially solve one of the technical problems in the related art.
[0006] This utility model provides a post-processing device, comprising:
[0007] A first housing, the first housing having an air inlet and a first air outlet; and
[0008] A second housing is fitted onto the first housing, and a gas flow channel is provided between the second housing and the first housing. Both ends of the gas flow channel are connected to the outside of the post-processing device.
[0009] Air flows continuously through the gas channel, creating a low-temperature air layer between the first and second shells. Since air has a thermal conductivity of approximately 0.023 W / m•K, while the insulation cotton commonly used in existing post-treatment devices has a thermal conductivity of approximately 0.031 W / m•K, air provides better insulation. Furthermore, the airflow can remove some heat through thermal convection, resulting in better overall insulation and reducing the risk of heat damage to the post-treatment device.
[0010] Since the materials commonly used for thermal insulation are generally glass fiber, which is expensive, this embodiment uses air instead of thermal insulation cotton, which helps to reduce costs.
[0011] In some embodiments, the second housing has an air inlet at one end near the air inlet, and the first housing has a connecting hole at one end near the first air outlet. The connecting hole connects the gas flow channel and the first air outlet. The gas flows in the gas flow channel along the direction of the air inlet, the connecting hole, and the first air outlet, thereby causing air to flow and carrying away some heat through thermal convection.
[0012] The second housing has a simple structure, with the air inlet located close to the air outlet and the connecting hole located close to the first air outlet. This facilitates the overall flow of air along the axial direction of the first housing, ensuring the heat insulation effect.
[0013] In some embodiments, there are multiple air inlets, which are spaced apart circumferentially along the second housing.
[0014] This air intake design increases airflow and ensures that air enters the gas channel along the circumference of the first housing, which is beneficial for uniform heat insulation of the first housing.
[0015] In some embodiments, there are multiple connecting holes, which are spaced apart circumferentially along the first housing.
[0016] This interconnecting hole design increases the channel area for air to flow to the first outlet, thereby increasing airflow and improving the heat insulation effect.
[0017] In some embodiments, the second housing includes:
[0018] The first body includes a first sleeve and a first flange. The first flange is connected to the side of the first sleeve near the first air outlet. The diameter of the first flange gradually decreases along the direction near the first air outlet, and the distance between the first flange and the second housing gradually increases along the direction near the first air outlet.
[0019] The second housing increases the airflow area, avoids increased airflow resistance due to the long gas flow channel, helps reduce the increased airflow resistance caused by the first fold changing the airflow direction, and helps increase the airflow in the gas flow channel, thereby improving the heat insulation effect.
[0020] In some embodiments, the second housing includes:
[0021] A first body, which is fitted onto the second housing; and
[0022] The first flange is located at both ends of the first body and is connected to the first body. The first flange is also connected to the first shell.
[0023] The second shell structure allows the first flange to overlap the first shell, thereby enabling the connection between the second shell and the first shell, which helps to ensure the connection area and connection strength between the first shell and the second shell.
[0024] In some embodiments, the first housing includes:
[0025] The second body has an air inlet located on one side of the second body, and a second air outlet at the end of the second body opposite to the air inlet.
[0026] An air outlet pipe is sleeved on the second air outlet, and the air outlet pipe and the second air outlet are spaced apart. The first air outlet is located at the end of the air outlet pipe away from the second body.
[0027] The first shell structure utilizes the diameter difference between the second air outlet and the air outlet pipe to form an annular channel for air flow within the air outlet pipe. This annular channel acts as an air ejector in the gas flow channel, which helps to increase the air flow velocity within the gas flow channel.
[0028] In some embodiments, the diameter of the second air outlet is smaller than the diameter of the air inlet.
[0029] This design is beneficial for increasing the gas flow velocity inside the first casing, creating a low-pressure zone at the second outlet. Under atmospheric pressure, the high-speed airflow creates the low-pressure zone, and the pressure difference draws the low-speed airflow from the high-pressure zone to the low-pressure zone. This makes it easier for the air in the gas flow channel to flow out from the connecting hole into the outlet pipe, allowing the low-pressure zone to act as an ejector. This further increases the air flow rate and velocity in the gas flow channel, allowing the air to be discharged from the first outlet along with the exhaust material flowing out from the second outlet.
[0030] In some embodiments, the post-processing apparatus further includes:
[0031] A third housing, disposed between the first housing and the second housing, wherein the gas flow channel is located between the second housing and the third housing; and
[0032] A heat insulation layer is disposed between the first housing and the third housing.
[0033] This post-treatment device utilizes the insulation layer and the air in the gas flow channel to achieve a double-layer insulation effect, which is beneficial to further improve the insulation effect of the post-treatment device and reduce the heat damage problem of the post-treatment device.
[0034] This post-treatment device utilizes the insulation layer and the air in the gas flow channel to achieve a double-layer insulation effect, which is beneficial to further improve the insulation effect of the post-treatment device and reduce the heat damage problem of the post-treatment device.
[0035] In some embodiments, the post-processing apparatus further includes:
[0036] The carrier, which is disposed within the first housing; and
[0037] A liner, which is located between the carrier and the first housing.
[0038] The carrier material is generally cordierite, with many tiny pores that provide support for the coated catalyst and serve as the site for the chemical reaction of emitted substances. The gasket is generally made of inorganic fiber composite material and is installed between the first shell and the carrier. The gasket is used to hold the carrier in place and has the functions of buffering, sealing, and heat insulation. Attached Figure Description
[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0040] Figure 1 This is a cross-sectional structural schematic diagram of the post-processing device provided in this embodiment of the utility model;
[0041] Figure 2 This is a schematic diagram of the post-processing device provided in an embodiment of the present utility model;
[0042] Figure 3 yes Figure 1 A magnified view of a portion of point A in the middle.
[0043] The markings in the image are as follows:
[0044] 100 - First housing; 110 - Second body; 111 - Air inlet; 112 - Second air outlet; 120 - Air outlet pipe; 121 - First air outlet; 122 - Connecting hole;
[0045] 200 - Second housing; 210 - First body; 211 - Air inlet; 212 - First sleeve; 213 - First flange; 220 - First folded edge;
[0046] 300 - Gas flow channel;
[0047] 400 - Third shell; 410 - Third body; 420 - Second flange;
[0048] 500 - Insulation layer;
[0049] 600-Carrier;
[0050] 700-Pad. Detailed Implementation
[0051] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.
[0052] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.
[0053] This embodiment provides an aftertreatment device that is installed downstream of an engine to reduce pollutants in engine emissions.
[0054] The aftertreatment device includes a first housing 100 having an air inlet 111 and a first air outlet 121, through which engine emissions enter the first housing 100 from the air inlet 111 and are discharged from the first air outlet 121.
[0055] The post-treatment device also includes a carrier 600 and a gasket. The carrier 600 is disposed within the first housing 100, and the gasket is located between the carrier 600 and the first housing 100. The carrier 600 is typically made of cordierite and has numerous fine pores, providing support for the coated catalyst and serving as the site for the chemical reaction of emitted substances. The gasket is typically made of inorganic fiber composite material and is installed between the first housing 100 and the carrier 600. The gasket serves to hold the carrier 600 in place and provides cushioning, sealing, and thermal insulation.
[0056] Engine emissions enter the first housing 100 through the air intake 111. The emissions pass through the carrier 600 and react chemically with the catalyst coated on the carrier 600 to purify some of the pollutants in the emissions.
[0057] The first housing 100 is made of stainless steel and is used to fix the carrier 600 and to guide the exhaust of the engine.
[0058] In some embodiments, the post-processing device further includes a second housing 200, which is fitted onto the first housing 100. A gas flow channel 300 is provided between the second housing 200 and the first housing 100, and both ends of the gas flow channel 300 are connected to the outside of the post-processing device to allow gas to flow within the gas flow channel 300. The gas here is air, which continuously flows through the gas flow channel 300, creating a low-temperature air layer between the first housing 100 and the second housing 200. Since the thermal conductivity of air is approximately 0.023 W / m•K, while the thermal insulation coefficient of the insulation cotton commonly used in existing post-processing devices is approximately 0.031 W / m•K, air has better insulation capabilities than insulation cotton. Furthermore, airflow can remove some heat through thermal convection, resulting in better overall insulation and helping to reduce the heat damage problem of the post-processing device.
[0059] Meanwhile, since the materials commonly used for thermal insulation are generally glass fiber, which is expensive, this embodiment uses air instead of thermal insulation cotton, which helps to reduce costs.
[0060] In some embodiments, the second housing 200 has an air inlet 211 at one end near the air inlet 111, and the first housing 100 has a connecting hole 122 at one end near the first air outlet 121. The connecting hole 122 connects the gas flow channel 300 and the first air outlet 121. Gas flows in the gas flow channel 300 along the direction of the air inlet 211, the connecting hole 122, and the first air outlet 121, thereby allowing air to flow and carrying away some heat through thermal convection. The second housing 200 has a simple structure, and the air inlet 211 is located near the air inlet 111, and the connecting hole 122 is located near the first air outlet 121, which facilitates the overall flow of air along the axial direction of the first housing 100 to ensure the heat insulation effect.
[0061] In some embodiments, there are multiple air inlets 211, which are spaced apart along the circumference of the second housing 200. This helps to increase the air intake flow and ensure that air enters the gas channel along the circumference of the first housing 100, which is beneficial for uniform heat insulation of the first housing 100.
[0062] For example, the air inlet 211 can be a strip-shaped hole that extends circumferentially along the second housing 200, thereby increasing the area of the air inlet 211 in the gas flow channel 300 and thus increasing the air flow rate.
[0063] In some embodiments, there are multiple connecting holes 122, which are spaced apart circumferentially along the first housing 100, thereby increasing the channel area for air to flow to the first air outlet 121, thereby increasing the air flow rate and improving the heat insulation effect.
[0064] Furthermore, the connecting hole 122 is a strip-shaped hole that extends circumferentially along the first housing 100, thereby increasing the area of the connecting hole 122 in the gas flow channel 300, which is beneficial to increasing the gas flow rate.
[0065] In some embodiments, the second housing 200 includes a first body 210, which is sleeved on the first housing 100.
[0066] The first body 210 includes a first sleeve 212 and a first folded edge 213. The first folded edge 213 is connected to the side of the first sleeve 212 near the first air outlet 121. Along the direction near the first air outlet 121, the diameter of the first folded edge 213 gradually decreases, so that the second housing 200 is wrapped around the first housing 100.
[0067] In some embodiments, the distance between the first folded edge 213 and the first housing 100 gradually increases in the direction close to the first air outlet 121, thereby increasing the air flow area, avoiding increased airflow resistance due to the long length of the gas flow channel 300, which helps to reduce the increased airflow resistance due to the change in airflow direction caused by the first folded edge 213, and helps to increase the airflow in the gas flow channel 300, thereby improving the heat insulation effect.
[0068] In some embodiments, the second housing 200 further includes a first flange 220, which is located at both ends of the first body 210 and connected to the first body 210. The first flange 220 is connected to the first housing 100, so that the first flange 220 forms an overlapping effect on the first housing 100, thereby using the first flange 220 to realize the connection between the second housing 200 and the first housing 100, which helps to ensure the connection area and connection strength between the first housing 100 and the second housing 200.
[0069] Furthermore, the first flange 220 is welded to the first housing 100, thereby ensuring the connection stability between the second housing 200 and the first housing 100.
[0070] In some embodiments, the first housing 100 includes a second body 110 and an exhaust pipe 120. An air inlet 111 is located on one side of the second body 110, and the end of the second body 110 opposite to the air inlet 111 has a second air outlet 112. The exhaust pipe 120 is sleeved on the second air outlet 112, and the exhaust pipe 120 and the second air outlet 112 are spaced apart. A first air outlet 121 is located at the end of the exhaust pipe 120 opposite to the second body 110. This structure of the first housing 100 utilizes the diameter difference between the second air outlet 112 and the exhaust pipe 120 to form an annular channel for airflow within the gas flow channel 300. The annular channel acts as an entrainer for airflow in the gas flow channel 300, which helps to increase the airflow velocity in the gas flow channel 300.
[0071] Specifically, the second body 110 and the exhaust pipe 120 are fixedly connected by full welding, which helps to ensure the connection stability between the second body 110 and the exhaust pipe 120.
[0072] In some embodiments, the diameter of the second outlet 112 is smaller than the diameter of the inlet 111. This design is beneficial for increasing the gas flow velocity within the first housing 100, creating a low-pressure zone at the second outlet 112. Under atmospheric pressure, the high-speed airflow creates the low-pressure zone, and the pressure difference draws the low-speed airflow from the high-pressure zone to the low-pressure zone. This makes it easier for the air in the gas channel 300 to flow out from the connecting hole 122 into the outlet pipe 120, allowing the low-pressure zone to act as an ejector. This further increases the airflow and velocity in the gas channel 300, allowing the air to be discharged from the outlet pipe 120 along with the exhaust material flowing out from the second outlet 112 from the first outlet 121.
[0073] In some embodiments, the post-treatment device further includes a third housing 400 and a heat insulation layer 500. The third housing 400 is disposed between the first housing 100 and the second housing 200, and the gas flow channel 300 is located between the second housing 200 and the third housing 400. The heat insulation layer 500 is disposed between the first housing 100 and the third housing 400. This post-treatment device utilizes the air in the heat insulation layer 500 and the gas flow channel 300 to achieve a double-layer heat insulation effect, which is beneficial to further improve the heat insulation effect of the post-treatment device and to reduce the heat damage problem of the post-treatment device.
[0074] In some embodiments, the third housing 400 includes a third body 410 and a second flange 420. The second flange 420 is located at both ends of the second body 110 and is connected to the second body 110. The third flange is connected to the second housing 200, so that the second flange 420 forms an overlapping effect on the first housing 100. Thus, the connection between the third housing 400 and the first housing 100 is achieved by using the second flange 420, which helps to ensure the connection area and connection strength between the first housing 100 and the third housing 400.
[0075] Furthermore, the second flange 420 is welded to the first housing 100, thereby ensuring the connection stability between the third housing 400 and the first housing 100.
[0076] It is understandable that the connecting hole 122 is provided on the gas outlet pipe 120, and the connecting hole 122 is located between the second flange 420 and the first flange 220, thereby ensuring that the connecting hole 122 is connected to the gas flow channel 300.
[0077] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0079] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0080] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0081] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0082] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. An aftertreatment device, characterized by, include: A first housing, the first housing having an air inlet and a first air outlet; as well as A second housing is fitted onto the first housing, and a gas flow channel is provided between the second housing and the first housing. Both ends of the gas flow channel are connected to the outside of the post-processing device. The second housing has an air inlet at one end near the air inlet, and the first housing has a connecting hole at one end near the first air outlet. The connecting hole connects the gas flow channel and the first air outlet, and the gas flows in the gas flow channel along the direction of the air inlet, the connecting hole and the first air outlet.
2. The aftertreatment device of claim 1, wherein, There are multiple air inlets, which are spaced apart circumferentially along the second housing.
3. The aftertreatment device of claim 1, wherein, There are multiple connecting holes, which are spaced apart circumferentially along the first housing.
4. The aftertreatment device of claim 1, wherein, The second housing includes: The first body includes a first sleeve and a first flange. The first flange is connected to the side of the first sleeve near the first air outlet. The diameter of the first flange gradually decreases along the direction near the first air outlet, and the distance between the first flange and the first housing gradually increases along the direction near the first air outlet.
5. The aftertreatment device of claim 1, wherein, The second housing includes: A first body, wherein the first body is fitted onto the first housing; and The first flange is located at both ends of the first body and is connected to the first body. The first flange is also connected to the first shell.
6. The aftertreatment device of claim 1, wherein, The first housing includes: The second body has an air inlet located on one side of the second body, and a second air outlet at the end of the second body opposite to the air inlet. An air outlet pipe is sleeved on the second air outlet, and the air outlet pipe and the second air outlet are spaced apart. The first air outlet is located at the end of the air outlet pipe away from the second body.
7. The aftertreatment device of claim 6, wherein, The diameter of the second air outlet is smaller than the diameter of the air inlet.
8. The aftertreatment device of any of claims 1-7, wherein, The post-processing device further includes: A third housing, disposed between the first housing and the second housing, wherein the gas flow channel is located between the second housing and the third housing; and A heat insulation layer is disposed between the first housing and the third housing.
9. The aftertreatment device of any of claims 1-7, wherein, The post-processing device further includes: The carrier, which is disposed within the first housing; and A liner, which is located between the carrier and the first housing.