Housing assembly for evaporative emission system diagnostor

Abstract

The utility model provides a shell assembly for a diagnostor of an evaporative emission system, the shell assembly is provided with a first port and a second port, the first port is communicated with external fresh air, the second port is communicated with a carbon tank of the evaporative emission system, and the first port is communicated with the carbon tank. A first cavity and a second cavity with cylindrical inner spaces are formed in the shell assembly, the axis of the first cavity and the axis of the second cavity are arranged in parallel, the first cavity and the second cavity are communicated with the first port, the second cavity is communicated with the second port, and the first port is communicated with the second port. The first chamber and the second chamber are communicated through a first pipeline; therefore, different gas circulation paths are formed between the first port and the second port, more installation space is provided through the cavity structure, assembly of all components in the evaporative emission system is facilitated, external pipeline communication between the different components is reduced, the assembly efficiency of products is improved, and the failure rate of the products is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle detection technical field, specifically, relate to a kind of shell assembly for evaporative emission system diagnostic instrument for leakage diagnosis in vehicle evaporative emission system. BACKGROUND

[0002] With the increasingly serious automobile exhaust pollution, the increasingly strict constraint of the promulgated automobile exhaust emission regulations to vehicle atmosphere emission, therefore, it is necessary to detect the leakage of evaporative emission system formed by fuel tank and entire evaporative pipeline in the use process of vehicle, and fuel tank leakage diagnosis module emerges as the times require in this process.

[0003] In the leakage diagnosis module of prior art center, gas pump needs to work continuously to build pressure for system, while, after the pressure in fuel tank rises, high-pressure gas can flow back to gas pump side, which needs to set one-way valve between fuel tank and gas pump, and the one-way valve pipeline between fuel tank and gas pump is complex, and the installation process is cumbersome, which needs to consume a lot of labor cost.

[0004] Therefore, in the prior art, there is the technical problem of complex pipeline and cumbersome installation process caused by setting one-way valve in leakage diagnosis module. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a kind of shell assembly for evaporative emission system diagnostic instrument, to solve the technical problem of complex pipeline and cumbersome installation process caused by setting one-way valve in leakage diagnosis module in related technology.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a kind of shell assembly for evaporative emission system diagnostic instrument is provided, the shell assembly has first port and second port, the first port is communicated with external fresh air, the second port is communicated with the carbon tank of evaporative emission system, first chamber and second chamber are formed in the shell assembly, at least a part of the first chamber and the second chamber is circular in cross section, the axis of the first chamber and second chamber is arranged in parallel, the first chamber and second chamber are communicated with the first port respectively, the second chamber is communicated with the second port, the first chamber and second chamber are communicated by first pipeline, the bottom of the second chamber is formed with support rib, the support rib is formed from the bottom of the second chamber, the support rib encloses third chamber with open top, wherein, the second port is only communicated with third chamber;The bottom of the third chamber is also provided with air hole, and the air hole is communicated with first pipeline.

[0007] Further, the shell assembly comprises: an upper shell; a lower shell, an upper portion of the lower shell being connected with a lower portion of the upper shell, the first port being arranged on the lower shell; a bottom cover, a lower portion of the lower shell being connected with the bottom cover, the second port being arranged on the bottom cover, at least a portion of the first pipeline being jointly surrounded by the lower shell and the bottom cover.

[0008] Further, the lower shell and the bottom cover are integrally formed.

[0009] Further, the first chamber communicates with the first port through a first opening formed on the side wall, the second chamber communicates with the first port through a second opening formed on the side wall, wherein an opening sectional area of the first opening is smaller than an opening sectional area of the second opening.

[0010] Further, the third chamber is a cylindrical structure with a circular cross section.

[0011] Further, a fourth chamber is further formed between the first chamber and the second chamber, an axis of the fourth chamber being parallel to an axis of the first chamber, one end of the fourth chamber communicating with the first pipeline.

[0012] Further, the upper shell and the lower shell are provided with mutually matched sealing grooves.

[0013] Further, an end face of a side of the lower shell facing the upper shell is provided with a positioning protrusion.

[0014] Further, an end portion of the first pipeline is provided with a fitting hole, the fitting hole being provided with a plugging.

[0015] The shell assembly for the evaporative emission system diagnostic device provided by the utility model forms a first chamber and a second chamber inside the shell assembly, wherein the first chamber and the second chamber respectively communicate with the first port, the second chamber communicates with the second port, and the first chamber and the second chamber are communicated through the first pipeline, so that different gas circulation paths are formed between the first port and the second port, more mounting spaces are provided through the chamber structure, the assembly of various components in the evaporative emission system is facilitated, the external pipeline communication between different components is reduced, the assembly efficiency of the product is improved, and the failure rate of the product is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the utility model, and together with the illustrative embodiments of the utility model and their description serve to explain the utility model, and do not constitute improper limitations on the utility model. In the drawings:

[0017] Figure 1A structural schematic view of a lower shell of the shell assembly according to the utility model is shown.

[0018] Figure 2 A structural schematic view of a lower shell of the shell assembly according to the utility model is shown.

[0019] Figure 3 A top view of the lower shell of the shell assembly according to the utility model is shown.

[0020] Figure 4 A structural schematic view of the lower shell of the shell assembly according to the utility model from another angle is shown.

[0021] Figure 5 A partial sectional view of the shell assembly according to the utility model is shown.

[0022] Among the above drawings, the following reference signs are included:

[0023] 1, first port; 2, second port; 3, first chamber; 4, second chamber; 5, first pipeline; 6, upper shell; 7, lower shell; 8, bottom cover; 9, support rib; 10, third chamber; 11, positioning protrusion; 12, fourth chamber; 13, assembly hole; 14, first opening; 15, second opening; 16, third opening. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0026] The relative arrangement of parts and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the present application unless otherwise specified. Meanwhile, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but in appropriate cases, the techniques, methods, and devices should be considered as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0027] In order to solve the technical problems of complex pipeline and cumbersome installation process caused by setting a one-way valve in the leakage diagnosis module in the prior art, the utility model provides a shell assembly for evaporative emission system diagnostic apparatus.

[0028] As Figure 1 shown, the utility model provides a shell assembly for evaporative emission system diagnostic apparatus, the shell assembly has first port 1 and second port 2, wherein, first port 1 communicates with external fresh air, second port 2 communicates with the carbon canister of evaporative emission system, so that the external fresh air can enter the inside of shell assembly from first port 1, the gas in the inside of shell assembly can be discharged from shell assembly through second port 2 and enter the carbon canister of evaporative emission system. Formed with the first chamber 3 and the second chamber 4 of the inside space cylindrical shape in the shell assembly, the axis of first chamber 3 and second chamber 4 is parallelly arranged, that is to say, first chamber 3 and second chamber 4 are arranged side by side in the inside of shell, wherein, first chamber 3 and second chamber 4 are communicated with first port 1 respectively, second chamber 4 is communicated with second port 2, first chamber 3 and second chamber 4 are communicated by first pipeline 5;The bottom of second chamber 4 is formed with support rib 9, support rib 9 is formed from the bottom of second chamber 4, support rib 9 encloses third chamber 10 with the top opening, wherein, third chamber 10 is communicated with second port 2 through third opening 16;Specifically, second port 2 is only communicated with third chamber 10, so that by closing third chamber 10, the fluid communication between second port 2 and first port 1 through second opening 15 can be blocked;The bottom of third chamber 10 is also provided with air hole, the air hole is communicated with first pipeline 5, so that by closing third chamber 10, the fluid communication between second chamber 4 and first chamber 3 can also be blocked simultaneously

[0029] The utility model provides a shell assembly for evaporative emission system diagnostic ware, through forming first chamber 3 and second chamber 4 in the shell assembly inside, wherein, first chamber 3 and second chamber 4 are communicated with first port 1 respectively, second chamber 4 is communicated with second port 2, and first chamber 3 and second chamber 4 are communicated through first pipeline 5, thereby forming different gas circulation paths between first port 1 and second port 2, and more mounting space is provided through chamber structure, the assembly of each component in evaporative emission system is convenient, the external pipeline communication between different components is reduced, and the assembly efficiency of product is improved, and the failure rate of product is reduced.

[0030] Further, the shell assembly comprises an upper shell 6, a lower shell 7 and a bottom cover 8, wherein the upper part of the lower shell 7 is connected with the lower part of the upper shell 6, and the lower part of the lower shell 7 is connected with the bottom cover 8, so as to form a closed structure with the first port 1 and the second port 2 through the upper shell 6, the lower shell 7 and the bottom cover 8; wherein the first port 1 is arranged on the lower shell 7; the second port 2 is arranged on the bottom cover 8, the first pipeline 5 is located between the lower shell 7 and the bottom cover 8, and at least a part of the path of the first pipeline 5 is surrounded by the lower shell 7 and the bottom cover 8; so as to form the first pipeline 5 connecting the first chamber 3 and the second chamber 4 at one end of the shell assembly close to the bottom cover 8.

[0031] Wherein, the lower shell 7 and the bottom cover 8 are integrally formed, for example, can be processed by integrally injection molding, so as to further improve the processing efficiency of product.

[0032] In order to facilitate assembly and improve sealing effect, the upper shell 6 and the lower shell 7 are provided with sealing grooves matched with each other, for example, at least one sealing protrusion is arranged on the upper shell 6, and at least one sealing groove matched with the sealing protrusion is arranged on the lower shell 7.

[0033] Wherein, the end face of the side of the lower shell 7 facing the upper shell 6 is further provided with a positioning protrusion 11, and the positioning protrusion 11 is used for assembly positioning of product, for example, when a gas pump is assembled in the first chamber 3, the positioning protrusion 11 can be matched with the gas pump, so as to facilitate assembly positioning of the gas pump.

[0034] In order to facilitate fluid communication between the first port 1 and the first chamber 3 and the second chamber 4, the first port 1 is located between the first chamber 3 and the second chamber 4, and such an arrangement is conducive to reducing the length of the communication path between the first chamber 3, the second chamber 4 and the first port 1.

[0035] Specifically, the first chamber 3 is communicated with the first port 1 through a first opening 14 formed on the side wall, and the second chamber 4 is communicated with the first port 1 through a second opening 15 formed on the side wall, preferably, the second chamber 4 is directly communicated with the first port 1, that is, the second opening 15 is located on the pipe wall of the first port 1 at the same time, and the first chamber 3 is also directly communicated with the first port 1, that is, the first opening 14 is also located on the pipe wall of the first port 1; so as to accelerate the interaction speed between fluids and reduce the processing cost; wherein the opening cross-sectional area of the first opening 14 is smaller than the opening cross-sectional area of the second opening 15.

[0036] The third chamber 10 is a cylindrical structure with a circular cross section, which facilitates the injection molding of the product and is also conducive to the sealing of the third chamber 10 in the control process.

[0037] In order to facilitate the assembly of the product, the end of the first pipeline 5 is also provided with an assembly hole 13, and the assembly hole 13 is provided with a plugging.

[0038] In another embodiment of the present application, a fourth chamber 12 is further formed between the first chamber 3 and the second chamber 4, the axis of the fourth chamber 12 is parallel to the axis of the first chamber 3, and one end of the fourth chamber 12 is communicated with the first pipeline 5, so that the pressure information in the first pipeline 5 can be obtained through the fourth chamber 12, and a sampling path is reserved for the pressure sensor in the product.

[0039] The shell assembly for the evaporative emission system diagnostic device provided by the present application forms a first chamber 3 and a second chamber 4 inside the shell assembly, wherein the first chamber 3 and the second chamber 4 are respectively communicated with a first port 1, the second chamber 4 is communicated with a second port 2, and the first chamber 3 and the second chamber 4 are communicated through a first pipeline 5, so as to form different gas flow paths between the first port 1 and the second port 2, and the first chamber 3 and the second chamber 4 provide a convenient installation space for the gas pump or the electromagnetic valve in the evaporative emission system, reduce the external pipeline communication between different components, improve the assembly efficiency of the product, reduce the failure rate of the product, and at the same time, the fourth chamber 12 provides a sampling path for the optional pressure sensor, and the positioning protrusion 11 provided on the lower shell 7 facilitates the assembly of the accessories.

[0040] In the description of the utility model, it needs to understand that the orientation words such as "front, back, top, bottom, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the orientation or positional relationship indicated usually are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore can not be understood as the limitation of the protection scope of the utility model, the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0041] For the convenience of description, spatial relative terms can be used here, such as "on", "above", "upper surface", "upper" and the like, to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0042] In addition, it needs to be explained that the use of "first", "second" and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore can not be understood as the limitation of the protection scope of the utility model.

[0043] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A housing assembly for a diagnostic tool for evaporative emission systems, characterized in that, The housing assembly has a first port and a second port. The first port communicates with external fresh air, and the second port communicates with the carbon canister of the evaporative emission system. The housing assembly contains a first chamber and a second chamber. At least a portion of the first chamber and the second chamber have circular cross-sections. The axes of the first chamber and the second chamber are parallel. The first chamber and the second chamber are respectively connected to the first port, and the second chamber is connected to the second port. The first chamber and the second chamber are connected via a first pipe. A support rib is formed at the bottom of the second chamber, extending from the bottom of the second chamber. The support rib encloses a third chamber with an open top. The second port communicates only with the third chamber. A vent is also provided at the bottom of the third chamber, and the vent communicates with the first pipe.

2. The housing assembly for an evaporative emission system diagnostic tool according to claim 1, characterized in that, The housing assembly includes: Upper shell; The lower housing is connected to the lower part of the upper housing, and the first port is provided on the lower housing; The bottom cover is connected to the lower part of the lower housing, the second port is disposed on the bottom cover, and at least a portion of the path of the first pipeline is formed by the lower housing and the bottom cover together.

3. The housing assembly for an evaporative emission system diagnostic tool according to claim 2, characterized in that, The lower housing and the bottom cover are integrally formed.

4. The housing assembly for an evaporative emission system diagnostic tool according to claim 1, characterized in that, The first chamber is connected to the first port through a first opening formed on the side wall, and the second chamber is connected to the first port through a second opening formed on the side wall, wherein the cross-sectional area of ​​the first opening is smaller than the cross-sectional area of ​​the second opening.

5. The housing assembly for an evaporative emission system diagnostic tool according to claim 1, characterized in that, The third chamber is a cylindrical structure with a circular cross-section.

6. The housing assembly for an evaporative emission system diagnostic tool according to claim 1, characterized in that, A fourth chamber is formed between the first chamber and the second chamber. The axis of the fourth chamber is parallel to the axis of the first chamber, and one end of the fourth chamber is connected to the first pipeline.

7. The housing assembly for an evaporative emission system diagnostic tool according to claim 2, characterized in that, The upper housing and the lower housing are provided with mutually cooperating sealing grooves.

8. The housing assembly for an evaporative emission system diagnostic tool according to claim 2, characterized in that, A positioning protrusion is provided on the end face of the lower housing facing the upper housing.

9. The housing assembly for an evaporative emission system diagnostic tool according to claim 1, characterized in that, The first pipeline has an assembly hole at its end, and the assembly hole is fitted with a plug.

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