housing assembly

Abstract

A shell assembly includes a metal shell, a mixer assembly and a heat preservation shell. The metal shell is provided with an air inlet, an air outlet and a mixing cavity between the air inlet and the air outlet. The mixer assembly is installed in the mixing cavity, and the mixer assembly is configured to mix exhaust gas of an engine with urea droplets. The heat preservation shell is shaped to match the shape of the metal shell, and the heat preservation shell is installed outside the metal shell. The heat preservation shell is provided with an edge portion near the air inlet and the air outlet, the edge portion extends in the circumferential direction, the edge portion is provided with fins and slots on both sides of the fins, and the fins are cantilevered and welded to the metal shell. The fins with elastic structure improve the adaptability.

Description

Technical Field

[0001] This invention relates to a housing assembly, belonging to the field of engine exhaust aftertreatment technology. Background Technology

[0002] Exhaust gas aftertreatment devices in related technologies typically include several aftertreatment carriers and a housing assembly. The aftertreatment carriers typically include a diesel oxidation catalyst carrier, a diesel particulate filter carrier, and a selective catalytic reduction (SCR) carrier. The housing assembly is usually connected between the diesel particulate filter carrier and the SCR carrier.

[0003] The housing assembly typically includes a metal housing, a mixer assembly located within the metal housing, and an insulation shell welded to the metal housing.

[0004] In related technologies, insulation shells are typically formed by stamping, and their shape and size correspond to those of the metal shell. However, the dimensions of the metal shell may vary for different applications, requiring the manufacture of insulation shells of different specifications, which increases costs.

[0005] Therefore, it is necessary to improve the insulation shell in related technologies to enhance its adaptability. Summary of the Invention

[0006] The purpose of this invention is to provide a housing assembly with high adaptability.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a housing assembly, comprising:

[0008] A metal housing, the metal housing having an airflow inlet, an airflow outlet, and a mixing cavity located between the airflow inlet and the airflow outlet; A mixer assembly, mounted within the mixing chamber, configured to mix engine exhaust gas with urea droplets; and The heat insulation shell is adapted to the shape of the metal shell. The heat insulation shell is installed on the outside of the metal shell. The heat insulation shell has an edge portion near the airflow inlet and the airflow outlet. The edge portion extends circumferentially and has a plurality of fins and slots on both sides of the fins. The fins are cantilevered and welded to the metal shell.

[0009] As a further improvement of the present invention, the metal housing also includes a raised first sensor seat, and the edge portion is provided with a first notch corresponding to the first sensor seat.

[0010] As a further improvement of the present invention, the metal housing also includes a raised second sensor seat, and the edge portion is provided with a second notch corresponding to the second sensor seat. The first sensor seat corresponds to the airflow inlet, and the second sensor seat corresponds to the airflow outlet.

[0011] As a further improvement of the present invention, each slot extends in a direction parallel to the axial direction of the airflow inlet.

[0012] As a further improvement of the present invention, the heat-insulating shell includes an annular base, the fins are connected to the annular base, and the fins are bent inward relative to the annular base.

[0013] As a further improvement of the present invention, the mixer assembly includes an outer tube and an inner tube at least partially located in the outer tube, the inner tube having a mixer protruding from the outer tube, and the mixer having a plurality of swirl vanes.

[0014] As a further improvement of the present invention, the outer tube is provided with a plurality of airflow perforations corresponding to the airflow inlet.

[0015] As a further improvement of the present invention, the housing assembly further includes a baffle fixed to the metal housing and close to the airflow outlet.

[0016] As a further improvement of the present invention, the baffle is provided with a plurality of air passage holes.

[0017] As a further improvement of the present invention, the housing assembly also includes thermal insulation cotton located between the metal housing and the thermal insulation shell.

[0018] Compared to existing technologies, the insulation shell of the present invention has an edge portion near the airflow inlet and the airflow outlet. The edge portion extends circumferentially and has a plurality of fins and slots on both sides of the fins. The fins are cantilevered and welded to the metal shell. By providing fins with an elastic structure, adaptability is improved. Attached Figure Description

[0019] Figure 1 This is a perspective view of the housing assembly of the present invention in one embodiment; Figure 2 yes Figure 1 Partial exploded 3D diagram; Figure 3 It is along Figure 1 A cross-sectional schematic diagram of a certain section. Detailed Implementation

[0020] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Where several specific embodiments exist, features in these embodiments may be combined with each other without conflict. When the description relates to the accompanying drawings, unless otherwise stated, the same numbers or symbols in different drawings denote the same or similar elements. The descriptions in the following exemplary embodiments do not represent all embodiments of the present invention; rather, they are merely examples of products consistent with the present invention as set forth in the claims.

[0021] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of protection of this invention. It should be understood that terms such as "first," "second," and similar words used in the specification and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish features.

[0022] Please refer to Figures 1 to 3 As shown, the present invention discloses a housing assembly 100, which includes a metal housing 1, a mixer assembly 2 located at least partially in the metal housing 1, an insulation shell 3 installed on the outside of the metal housing 1, and insulation cotton 4 located between the metal housing 1 and the insulation shell 3.

[0023] In the embodiment illustrated in the present invention, the metal housing 1 is generally figure-eight shaped, and has an airflow inlet 11, an airflow outlet 12, and a mixing cavity 13 located between the airflow inlet 11 and the airflow outlet 12. Furthermore, the metal housing 1 also includes a raised first sensor seat 14 and a raised second sensor seat 15, the first sensor seat 14 corresponding to the airflow inlet 11 and the second sensor seat 15 corresponding to the airflow outlet 12.

[0024] The mixer assembly 2 is installed in the mixing chamber 13 and is configured to mix engine exhaust gas with urea droplets. Specifically, in the embodiment illustrated in the present invention, the mixer assembly 2 includes an outer tube 21 and an inner tube 22 at least partially located within the outer tube 21. The inner tube 22 is provided with a mixer 23 protruding from the outer tube 21, and the mixer 23 is provided with a plurality of swirl vanes 24. The swirl vanes 24 are configured to allow engine exhaust gas to pass through to form a swirling flow. When the injection conditions are met, the urea nozzle injects atomized urea droplets into the inner tube 22. The swirling exhaust gas envelops and mixes the urea droplets, which helps to improve the uniformity of mixing and reduce the risk of urea crystallization.

[0025] In the embodiment illustrated in the present invention, the outer pipe 21 is provided with a plurality of airflow perforations 211 corresponding to the airflow inlet 11. A small portion of the engine exhaust gas can directly pass through the airflow perforations 211 and enter the mixer assembly 2, thereby playing a certain role in back pressure regulation, heating, and heat preservation.

[0026] In the embodiment illustrated in the present invention, the housing assembly 100 further includes a baffle 5 fixed to the metal housing 1 and close to the airflow outlet 12. The baffle 5 is provided with a plurality of airflow holes 51.

[0027] In the embodiment illustrated in the present invention, the shape of the heat-insulating shell 3 is adapted to the shape of the metal shell 1, that is, the heat-insulating shell 3 can be installed on the metal shell 1. The heat-insulating shell 3 is installed on the outside of the metal shell 1. The heat-insulating shell 3 has an edge portion 31 near the airflow inlet 11 and the airflow outlet 12. The edge portion 31 extends circumferentially and has a plurality of fins 32 and slots 33 on both sides of the fins 32. The fins 32 are cantilevered and welded to the metal shell 1.

[0028] Specifically, in one embodiment of the present invention, each slot 33 extends in a direction parallel to the axial direction of the airflow inlet 11. The fin 32 is a spring sheet with a free end to provide a certain elastic deformation capability, thereby enabling it to better conform to the metal shell 1.

[0029] In the embodiment illustrated in the present invention, the heat-insulating shell 3 includes an annular base 34, the fins 32 are connected to the annular base 34, and the fins 32 are bent inward relative to the annular base 34, thereby facilitating a better fit to the metal shell 1.

[0030] Furthermore, the edge portion 31 is provided with a first notch 35 corresponding to the first sensor seat 14 and a second notch 36 corresponding to the second sensor seat 15. The first sensor seat 14 is at least partially received in the first notch 35, and the second sensor seat 15 is at least partially received in the second notch 36 to allow for clearance.

[0031] Compared to existing technologies, the insulation shell 3 of the present invention has an edge portion 31 near the airflow inlet 11 and the airflow outlet 12. The edge portion 31 extends circumferentially and has a plurality of fins 32 and slots 33 on both sides of the fins 32. The fins 32 are cantilevered and welded to the metal shell 1. By providing fins 32 with an elastic structure, the adaptability of the insulation shell 3 to different metal shells 1 is improved, and the cost is reduced.

[0032] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on those skilled in the art. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A housing assembly, characterized in that, include: A metal housing, the metal housing having an airflow inlet, an airflow outlet, and a mixing cavity located between the airflow inlet and the airflow outlet; A mixer assembly, installed in the mixing chamber, configured to mix engine exhaust gas with urea droplets; as well as The heat insulation shell is adapted to the shape of the metal shell. The heat insulation shell is installed on the outside of the metal shell. The heat insulation shell has an edge portion near the airflow inlet and the airflow outlet. The edge portion extends circumferentially and has a plurality of fins and slots on both sides of the fins. The fins are cantilevered and welded to the metal shell.

2. The housing assembly as claimed in claim 1, characterized in that: The metal housing also includes a raised first sensor base, and the edge portion is provided with a first notch corresponding to the first sensor base.

3. The housing assembly as claimed in claim 2, characterized in that: The metal housing also includes a raised second sensor seat, and the edge portion is provided with a second notch corresponding to the second sensor seat. The first sensor seat corresponds to the airflow inlet, and the second sensor seat corresponds to the airflow outlet.

4. The housing assembly as claimed in claim 1, characterized in that: Each slot extends in a direction parallel to the axial direction of the airflow inlet.

5. The housing assembly as claimed in claim 1, characterized in that: The insulation shell includes an annular base, the fins are connected to the annular base, and the fins are bent inward relative to the annular base.

6. The housing assembly as claimed in claim 1, characterized in that: The mixer assembly includes an outer tube and an inner tube at least partially located within the outer tube, the inner tube having a mixer protruding from the outer tube, the mixer having a plurality of swirl vanes.

7. The housing assembly as claimed in claim 6, characterized in that: The outer tube is provided with a number of airflow perforations corresponding to the airflow inlet.

8. The housing assembly as claimed in claim 6, characterized in that: The housing assembly also includes a baffle fixed to the metal housing and close to the airflow outlet.

9. The housing assembly as claimed in claim 8, characterized in that: The baffle is provided with several air passage holes.

10. The housing assembly as claimed in any one of claims 1 to 9, characterized in that: The housing assembly also includes thermal insulation cotton located between the metal housing and the insulation shell.

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