Connecting pipe assembly

Abstract

A connecting pipe assembly comprises a nut seat, an adapter, an air pipe and a bolt. The nut seat is provided with an airflow channel and an internal thread. The adapter comprises a first end part, a second end part, a through hole penetrating through the first end part and the second end part, and a mounting hole communicated with the through hole. And the air pipe is fixed on the adapter. The bolt is provided with a bolt part, and the bolt part is provided with an external thread. And the bolt part penetrates through the through hole and enables the external thread to be tightly matched with the internal thread. And the contact part of the first end part of the adapter and the bolt is sealed, and the contact part of the second end part of the adapter and the nut seat is sealed. The bolt part is provided with a hollow cavity and an air hole communicated with the cavity, and the air hole is communicated with the air pipe. By means of the arrangement, the overall height of the connecting pipe assembly can be designed to be low, and installation convenience can be improved.

Description

Technical Field

[0001] The utility model relates to a connecting pipe assembly, belonging to the technical field of parts of an engine exhaust aftertreatment device. Background Art

[0002] The exhaust aftertreatment device in the related art generally includes a housing, several exhaust aftertreatment carriers encapsulated in the housing, and several air pipes connected to a sensor and used for detecting gas.

[0003] In the related art, a connecting structure is usually adopted to install the air pipes. However, the connecting structure has a large height and is inconvenient to install. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a connecting pipe assembly with an improved structure.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a connecting pipe assembly configured for an engine exhaust aftertreatment device, the connecting pipe assembly comprising:

[0006] A nut seat provided with an air flow channel and an internal thread exposed in the air flow channel;

[0007] A swivel joint including a first end, a second end opposite to the first end, a perforation penetrating through the first end and the second end, and a mounting hole communicating with the perforation;

[0008] An air pipe fixed to the swivel joint; and

[0009] A bolt provided with a bolt portion having an external thread, the bolt portion passing through the perforation and tightly fitting the external thread with the internal thread; the contact portion between the first end of the swivel joint and the bolt is sealed, and the contact portion between the second end of the swivel joint and the nut seat is sealed; the bolt portion is provided with a hollow cavity and an air hole communicating with the cavity, and the air hole communicates with the air pipe.

[0010] As a further improved technical scheme of the utility model, the nut seat is provided with a third end and a fourth end opposite to the third end, and the air flow channel at least penetrates through the third end.

[0011] As a further improved technical scheme of the utility model, the second end of the swivel joint and the third end of the nut seat are sealed by mutually abutted conical surfaces.

[0012] As a further improved technical solution of the present utility model, a protruding first conical surface is provided at the third end of the nut seat, and a concave second conical surface is provided at the second end of the adapter. The first conical surface abuts against the second conical surface.

[0013] As a further improved technical solution of the present utility model, the bolt is provided with a head connected to the bolt portion. The head is provided with a protruding third conical surface, and a concave fourth conical surface is provided at the first end of the adapter. The third conical surface abuts against the fourth conical surface.

[0014] As a further improved technical solution of the present utility model, the head includes a hexagonal surface to facilitate screwing the bolt into the nut seat.

[0015] As a further improved technical solution of the present utility model, the joint between the external thread and the internal thread is sealed.

[0016] As a further improved technical solution of the present utility model, the adapter is provided with a lateral protruding portion, and the mounting hole is provided in the protruding portion.

[0017] As a further improved technical solution of the present utility model, at least a part of the air pipe is inserted into the mounting hole of the protruding portion and is fixedly welded to the protruding portion.

[0018] As a further improved technical solution of the present utility model, the bolt is provided with a mark to ensure that when the bolt is fastened to the nut seat, the air hole can be aligned with the air pipe.

[0019] Compared with the prior art, the connecting pipe assembly of the present utility model includes a nut seat, an adapter, an air pipe and a bolt. The bolt is provided with a bolt portion, and the bolt portion is provided with an external thread. The bolt portion passes through the through hole and makes the external thread tightly fit with the internal thread of the nut seat. The contact part between the first end of the adapter and the bolt is sealed, and the contact part between the second end of the adapter and the nut seat is sealed. The bolt portion is provided with a hollow cavity and an air hole communicated with the cavity, and the air hole is communicated with the air pipe. With such a setting, the overall height of the connecting pipe assembly of the present utility model can be designed to be relatively low, and it is beneficial to improve the convenience of installation. Description of the Drawings

[0020] Figure 1 is a three-dimensional schematic diagram of the connecting pipe assembly of the present utility model in one embodiment.

[0021] Figure 2 is Figure 1 a partial three-dimensional exploded view of

[0022] Figure 3 is Figure 1Front view.

[0023] Figure 4 is the schematic cross-sectional view along Figure 3 the A-A line in

[0024] Figure 5 is the schematic cross-sectional view along Figure 3 the B-B line in

[0025] Figure 6 is Figure 2 the right view of the bolt in

[0026] Figure 7 is the schematic cross-sectional view along Figure 6 the C-C line in

[0027] Figure 8 is Figure 2 the top view of the adapter in

[0028] Figure 9 is the schematic cross-sectional view along Figure 8 the D-D line in

[0029] Figure 10 is Figure 2 the top view of the nut seat in

[0030] Figure 11 is the schematic cross-sectional view along Figure 10 the E-E line in Detailed implementation manners

[0031] The following will describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings. Among them, if there are several specific implementation manners, the features in these implementation manners can be combined with each other without conflict. When the description involves the accompanying drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The content described in the following exemplary specific implementation manners does not represent all implementation manners of the present utility model. On the contrary, they are only examples of products that are consistent with what is recorded in the claims of the present utility model.

[0032] The terms used in the present utility model are only for the purpose of describing specific implementation manners and are not intended to limit the protection scope of the present utility model. It should be understood that the terms used in the description and claims of the present utility model, such as "first", "second" and similar terms, do not represent any order, quantity or importance, but are only used to distinguish the named features.

[0033] Please refer to Figures 1 to 11As shown, the present utility model discloses a connecting pipe assembly 100 configured for an engine exhaust aftertreatment device. The connecting pipe assembly 100 includes a nut seat 1, an adapter 2, an air pipe 3, and a bolt 4.

[0034] The nut seat 1 is provided with an air flow channel 10 and an internal thread 11 exposed within the air flow channel 10.

[0035] The adapter 2 includes a first end 21, a second end 22 opposite to the first end 21, a perforation 20 passing through the first end 21 and the second end 22, and a mounting hole 23 communicating with the perforation 20.

[0036] The air pipe 3 is fixed to the adapter 2 and communicates with the perforation 20.

[0037] The bolt 4 is provided with a bolt portion 41 having an external thread 411. The bolt portion 41 passes through the perforation 20 and makes the external thread 411 fit tightly with the internal thread 11. The contact portion between the first end 31 of the adapter 2 and the bolt 4 is sealed. The contact portion between the second end 22 of the adapter 2 and the nut seat 1 is sealed. The bolt portion 41 is provided with a hollow cavity 410 and an air hole 412 communicating with the cavity 410. The air hole 412 communicates with the air pipe 3.

[0038] Specifically, in the illustrated embodiment of the present utility model, the nut seat 1 is provided with a third end 13 and a fourth end 14 opposite to the third end 13, and the air flow channel 10 at least penetrates the third end 13. In the illustrated embodiment of the present utility model, the air flow channel 10 penetrates the third end 13 and the fourth end 14.

[0039] The second end 22 of the adapter 2 and the third end 13 of the nut seat 1 are sealed by mutually abutting conical surfaces. In the illustrated embodiment of the present utility model, the third end 13 of the nut seat 1 is provided with a protruding first conical surface 131, and the second end 22 of the adapter 2 is provided with a concave second conical surface 221. The first conical surface 131 abuts against the second conical surface 221 to achieve a better sealing effect.

[0040] The bolt 4 is provided with a head 42 connected to the bolt portion 41. The head 42 is provided with a protruding third conical surface 421, and the first end 21 of the adapter 2 is provided with a concave fourth conical surface 211. The third conical surface 421 abuts against the fourth conical surface 211 to achieve a better sealing effect.

[0041] In the illustrated embodiment of the present utility model, the head 42 includes a hexagonal surface 422 to facilitate screwing the bolt 4 into the nut seat 1.

[0042] In the illustrated embodiment of the present utility model, a mark 423 is provided on the head 42 of the bolt 4 to ensure that when the bolt 4 is fastened to the nut seat 1, the air hole 412 can be directly opposite to the air pipe 3. The mark 423 is only for identification and its form can be various. In the illustrated embodiment of the present utility model, the mark 423 is a groove. When the bolt 4 is fastened to the nut seat 1, the joint of the external thread 411 and the internal thread 11 is sealed.

[0043] In the illustrated embodiment of the present utility model, the adapter 2 is provided with a lateral protrusion 24, and the mounting hole 23 is provided in the protrusion 24. At least a part of the air pipe 3 is inserted into the mounting hole 23 of the protrusion 24 and is fixedly welded to the protrusion 24. Those skilled in the art can understand that by changing the size of the mounting hole 23 (for example, machining mounting holes 23 with different sizes), air pipes 3 with different pipe diameters can be matched. At this time, other parts of the connecting pipe assembly 100 of the present utility model, such as the nut seat 1 and the bolt 4, do not need to be changed, thereby reducing the cost.

[0044] In addition, in the illustrated embodiment of the present utility model, there are two air holes 412 which penetrate the wall of the bolt part 41. The adapter 2 is further provided with an annular buffer space 25 communicated with the air holes 412. When the bolt part 41 passes through the through hole 20, the bolt part 41 located in the through hole 20 is surrounded by the buffer space 25, and the buffer space 25 can provide more inflow channels for the air flow flowing from the air pipe 3 to the air holes 412, which is beneficial to reducing the back pressure. Specifically, when the air flow flows from the air pipe 3 to the air holes 412, a part of the air flow can directly flow into the cavity 410 through one air hole 412 facing the air pipe 3, and another part of the air flow can pass through the buffer space 25 and flow into the cavity 410 through the other air hole 412.

[0045] The above embodiments are only used to illustrate the present utility model and do not limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although this specification has described the present utility model in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify the present utility model or make equivalent replacements, and all technical solutions and their improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. A connecting pipe assembly configured to be used on an engine exhaust aftertreatment device, characterized in that: The connecting pipe assembly comprises: A nut seat, wherein the nut seat is provided with an air flow channel and an internal thread exposed in the air flow channel; An adapter, the adapter comprising a first end, a second end opposite to the first end, a through hole passing through the first end and the second end, and a mounting hole communicating with the through hole; an air pipe, the air pipe being fixed to the adapter; and A bolt, wherein the bolt is provided with a bolt portion, wherein the bolt portion is provided with an external thread, wherein the bolt portion passes through the through hole and makes the external thread tightly fit with the internal thread; the first end of the adapter is sealed at a contact portion with the bolt, and the second end of the adapter is sealed at a contact portion with the nut seat; the bolt portion is provided with a hollow cavity and an air hole connected to the cavity, and the air hole is connected to the air pipe.

2. The connecting pipe assembly according to claim 1, characterized in that: The nut seat is provided with a third end and a fourth end opposite to the third end, and the air flow channel at least passes through the third end.

3. The connecting pipe assembly according to claim 2, characterized in that: The second end of the adapter and the third end of the nut seat are sealed by mutually abutting conical surfaces.

4. The connecting pipe assembly according to claim 3, characterized in that: A convex first conical surface is provided at the third end of the nut seat, and a concave second conical surface is provided at the second end of the adapter, and the first conical surface abuts against the second conical surface.

5. The connecting pipe assembly according to claim 1, characterized in that: The bolt is provided with a head connected to the bolt portion, the head is provided with a protruding third conical surface, the first end of the adapter is provided with a concave fourth conical surface, and the third conical surface abuts against the fourth conical surface.

6. The connecting pipe assembly according to claim 5, characterized in that: The head includes a hexagonal surface to facilitate screwing the bolt into the nut seat.

7. The connecting pipe assembly according to claim 1, characterized in that: The junction between the external thread and the internal thread is sealed.

8. The connecting pipe assembly according to claim 1, characterized in that: The adapter is provided with a lateral protrusion, and the mounting hole is provided in the protrusion.

9. The connecting pipe assembly according to claim 8, characterized in that: The air pipe is at least partially inserted into the mounting hole of the protruding portion and is fixed to the protruding portion by welding.

10. The connecting pipe assembly according to claim 1, characterized in that: The bolt is provided with a mark to ensure that when the bolt is fastened to the nut seat, the air hole can face the air pipe.

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