阅读说明：本技术 一种后处理封装单元及其组装过程 (post-processing packaging unit and assembling process thereof ) 是由 刘正锐 卞增涛 王奉双 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种后处理封装单元及其组装过程,组装过程包括以下步骤：多点测量催化剂载体的直径,取催化剂载体的直径平均值记为A,测量衬垫的重量B和衬垫的面积C,计算衬垫的面密度D＝B/C；根据GBD＝2D/(E－A),计算确定封装单元的壳体内径尺寸E,其中,GBD中值确定；将催化剂载体和衬垫封装进壳体中,对壳体进行压型,使壳体中段的内径压型至尺寸E。该组装过程通过精确测量催化剂载体直径以及衬垫面密度,计算得出壳体内径,对壳体进行压型,达到精确控制GBD的目的,提高了封装单元GBD下限,缩小了GBD范围,提高了封装单元保持力及产品一致性,封装单元的机械可靠性有较大提高。(The invention discloses a post-processing packaging unit and an assembling process thereof, wherein the assembling process comprises the following steps: measuring the diameter of the catalyst carrier at multiple points, taking the average value of the diameters of the catalyst carrier as A, measuring the weight B of the gasket and the area C of the gasket, and calculating the surface density D of the gasket as B/C; calculating and determining the inner diameter dimension E of the shell of the packaging unit according to GBD (GBD is 2D/(E-A), wherein the GBD median is determined; and encapsulating the catalyst carrier and the gasket into the shell, and profiling the shell to enable the inner diameter of the middle section of the shell to be profiled to be of a dimension E. In the assembling process, the inner diameter of the shell is calculated by accurately measuring the diameter of the catalyst carrier and the surface density of the gasket, the shell is profiled, the aim of accurately controlling the GBD is fulfilled, the GBD lower limit of the packaging unit is improved, the GBD range is reduced, the retention force and the product consistency of the packaging unit are improved, and the mechanical reliability of the packaging unit is greatly improved.)

1. An assembly process for a post-processing packaging unit, comprising the steps of:

Measuring the diameter of the catalyst carrier at multiple points, taking the average value of the diameters of the catalyst carrier as A, measuring the weight B of the gasket and the area C of the gasket, and calculating the surface density D of the gasket as B/C;

Calculating and determining the inner diameter dimension E of the shell of the packaging unit according to GBD (GBD is 2D/(E-A), wherein the GBD median is determined;

and encapsulating the catalyst carrier and the gasket into the shell, and profiling the shell to enable the inner diameter of the middle section of the shell to be profiled to be of a dimension E.

2. the assembly process of claim 1, wherein the inner diameter of the shell at both ends is greater than the inner diameter of the shell at the middle section.

3. A post-processing packaging unit, characterized in that it is assembled by the assembly process according to claim 1 or 2.

Technical Field

The invention relates to the technical field of post-processing, in particular to a post-processing packaging unit and an assembling process thereof.

Background

in the field of engine aftertreatment systems, the packaging of aftertreatment systems is an essential link. Conventional aftertreatment system packages include the assembly of the inlet element, the packaging of the carrier, the packaging of the outlet element, and the packaging of the system assembly. The packaging unit of the post-treatment refers to a general name of a catalyst carrier, a gasket and a shell, and the gasket, the shell and the carrier are kept from moving by friction force.

The calculation formula of the packing unit holding force (frictional force) F is: f ═ μ N, μ is the coefficient of friction, and N is the pressure between the gasket and the shell.

GBD is a parameter (unit: g/cm) for controlling the pressure of the packing unit³) GBD is the areal density of the mat/GAP, wherein GAP is the shell radius — carrier radius, and as the GBD value increases, the radial pressure between the individual components of the encapsulation increases and the holding force F increases.

The method for assembling the packaging unit by the traditional domestic manufacturer is simple plug-in, the gasket is packed in the shell after wrapping the carrier, the size tolerance of the catalyst and the packaging unit shell causes the gap and the corresponding GBD range to be wider (30%), the packaging unit retention force has larger fluctuation, and the product reliability is influenced. Statistically, the GBD effect of component tolerances is shown in table 1:

TABLE 1 influence of catalyst support and Shell tolerances on GBD

Details of the components	Tolerance of parts	Influence on GBD variation range
			Catalyst carrier	1.5mm	45％
Shell body	1mm	30％
			Liner pad	Basis weight 8%	25％

Therefore, how to precisely control the GBD range and improve the retention of the encapsulated unit is a technical problem that needs to be solved by those skilled in the art.

disclosure of Invention

In view of the above, the present invention is directed to a post-processing packaging unit and an assembling process thereof, which can precisely control the GBD range and improve the packaging unit retention and product consistency.

in order to achieve the purpose, the invention provides the following technical scheme:

An assembly process for a post-processing packaging unit, comprising the steps of:

Measuring the diameter of the catalyst carrier at multiple points, taking the average value of the diameters of the catalyst carrier as A, measuring the weight B of the gasket and the area C of the gasket, and calculating the surface density D of the gasket as B/C;

calculating and determining the inner diameter dimension E of the shell of the packaging unit according to GBD (GBD is 2D/(E-A), wherein the GBD median is determined;

And encapsulating the catalyst carrier and the gasket into the shell, and profiling the shell to enable the inner diameter of the middle section of the shell to be profiled to be of a dimension E.

Preferably, the inner diameter of the two ends of the shell is larger than that of the middle section of the shell.

Preferably, the GBD median is 0.435 or other median designed for different product specifications.

The invention provides an assembly process of a post-processing packaging unit, which is characterized in that the diameter of a catalyst carrier and the surface density of a gasket are accurately measured in the assembly process, the inner diameter of a shell is calculated, the shell is molded, the aim of accurately controlling GBD is fulfilled, the GBD lower limit of the packaging unit is improved, the GBD range is reduced, the retention force and the product consistency of the packaging unit are improved, and the mechanical reliability of the packaging unit is greatly improved.

the invention also provides a post-processing packaging unit assembled by the assembling process. The shell of the post-processing packaging unit is subjected to compression processing, so that the GBD range is accurately controlled, the GBD lower limit is moved upwards, and the packaging unit holding power is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a package unit structure of a profiling structure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an assembly process of a package unit according to an embodiment of the present invention;

fig. 3 is a schematic diagram showing a pressure comparison between a press type structure packing unit and a simple stuffing packing unit in an embodiment of the present invention.

In fig. 1 to 2:

1-catalyst carrier, 2-pad, 3-shell.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 3, fig. 1 is a schematic diagram illustrating a package unit structure with a profiling structure according to an embodiment of the present invention; FIG. 2 is a schematic diagram of an assembly process of a package unit according to an embodiment of the present invention; fig. 3 is a schematic diagram showing a pressure comparison between a press type structure packing unit and a simple stuffing packing unit in an embodiment of the present invention.

The invention provides an assembly process of a post-processing packaging unit, which comprises the following steps of:

Measuring the diameter of the catalyst carrier 1 at multiple points, taking the average value of the diameters of the catalyst carrier 1 as A, measuring the weight B of the mat 2 and the area C of the mat 2, and calculating the area density D of the mat 2 as B/C;

according to GBD 2D/(E-A), calculating and determining the inner diameter dimension E of the shell 3 of the packaging unit, wherein the GBD median is determined;

and encapsulating the catalyst carrier 1 and the gasket 2 into the shell 3, and profiling the shell 3 to enable the inner diameter of the middle section of the shell 3 to be profiled to a size E, so as to accurately control GBD.

Preferably, the inner diameter of the housing 3 is larger at both ends than at the middle section of the housing 3. As shown in fig. 1, the inner diameter of the casing 3 before being pressed is d1, and after being pressed, the inner diameter of the middle section of the casing 3 is reduced to d2, d2 < d1, so that the structure increases the lower limit of the variation range of the packing unit GAP, reduces the GBD range, and improves the holding power of the packing unit.

it should be noted that, in the present scheme, before measurement and profiling are performed, the GBD median is determined, and because the product specifications are different, the GBD median value is also different, and the retention force of the encapsulation unit corresponding to the GBD median reaches the maximum. Preferably, the median GBD in this particular embodiment is 0.435. As can be seen from the graph in FIG. 3, compared with the scheme of simply plugging in the packaging unit, the GBD range can be accurately controlled within 6% after the shell is pressed, and the corresponding pressure is also maximized.

the invention has the following beneficial effects:

1) the packaging unit with the profiling structure can accurately control the GBD range of the packaging unit, and the holding force of the packaging unit is increased;

2) The lower limit of GBD of the packaging unit is improved;

3) The product consistency is high, and the mechanical reliability of the product is greatly improved;

4) The cost of the gasket is reduced.

The invention also provides a post-processing packaging unit assembled by the assembling process. The shell of the post-processing packaging unit is subjected to compression processing, so that the GBD range is accurately controlled, the GBD lower limit is moved upwards, and the packaging unit holding power is improved.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.