Three-way catalyst pressure sensor pipe connecting structure

Abstract

The utility model discloses a three-way catalyst pressure sensor pipe connecting structure, and relates to the field of automobile three-way catalyst manufacturing. The pressure sensor comprises a locking bolt, a sensor nut and a pressure sensor tube, the core part of the sensor nut is provided with an axial through hole, the through hole comprises a bolt connecting hole and a three-way catalyst connecting hole, and the inner diameter of the bolt connecting hole is larger than that of the three-way catalyst connecting hole. The joint of the bolt connecting hole and the three-way catalyst connecting hole is provided with a boss extending into the hole, and the end head of the pressure sensor pipe connecting end is provided with a trumpet-shaped plain end which is enlarged outwards; when the sensor nut is tightened, the horn plain end of the end of the pressure sensor pipe abuts against the boss. Compared with the prior art, a taper pipe part of the connecting end of an existing pressure sensor pipe is removed, the connecting end head of the pressure sensor pipe is designed to be a horn plain end, the connecting structure is simplified, meanwhile, the size of the connecting end is shortened, the length of a sensor nut is shortened, the manufacturing cost of parts is reduced, installation is rapid, and working efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile three-way catalytic converter manufacturing, in particular to a three-way catalytic converter pressure sensor pipe connection structure. Background Art

[0002] Catalyst pressure sensor tubes are usually used to monitor the pressure changes inside the catalyst. When using the catalyst pressure sensor tube, it needs to be installed on the catalyst and ensure that it is connected to the pressure channel inside the catalyst. The catalyst is an important part of the engine emission control system. Its working state directly affects the engine performance and emission level. By monitoring the pressure changes of the catalyst, the engine operating parameters can be adjusted in time to optimize engine performance and reduce emissions. The existing three-way catalytic converter pressure sensor tube connection structure, such as Figure 1 As shown, it includes a locking bolt 102, a sensor nut 101 and a pressure sensor tube 103. The core of the sensor nut 101 is provided with an axial through hole, and the through hole includes a bolt connection hole L1 and a three-way catalytic converter connection hole L2. The inner diameter of the bolt connection hole L1 is larger than the inner diameter of the three-way catalytic converter connection hole L2, and the end of the three-way catalytic converter connection hole L2 connected to the bolt connection hole L1 is a tapered hole; the connecting end of the pressure sensor tube 103 includes a straight tube portion 103-1 and a tapered tube portion 103-2, the locking bolt 102 is sleeved on the straight tube portion 103-1, the straight tube portion 103-1 is connected to the locking bolt 102 through a thread, and a locking bolt limiting convex ring 103-3 is provided between the straight tube portion 103-1 and the tapered tube portion 103-2. When the sensor nut 101 is tightened, the tapered tube portion 103-2 abuts against the tapered hole. In such a connection structure, the length of the sensor nut and the locking bolt is relatively long. The length L of the sensor nut needs to be 22 mm. The bolt connection hole L1 is relatively deep, and the hole depth H needs to be 14.5 mm, which wastes materials. When tightening the sensor nut with a torque wrench, many turns are required, which is time-consuming and labor-intensive, and the installation efficiency is low. Utility Model Content

[0003] The utility model aims to provide a three-way catalytic converter pressure sensor tube connection structure, which can solve the problems of large material consumption and low working efficiency during installation of the existing three-way catalytic converter pressure sensor tube connection structure.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is: this three-way catalytic converter pressure sensor tube connection structure includes a locking bolt, a sensor nut and a pressure sensor tube, the core of the sensor nut is provided with an axial through hole, the through hole includes a bolt connection hole and a three-way catalytic converter connection hole, the inner diameter of the bolt connection hole is larger than the inner diameter of the three-way catalytic converter connection hole, the connection between the bolt connection hole and the three-way catalytic converter connection hole is a boss extending into the hole, and the end of the pressure sensor tube connection end is set as a trumpet flat mouth enlarged outward; when the sensor nut is tightened, the trumpet flat mouth of the pressure sensor tube end abuts against the boss.

[0005] In the above technical solution, a more specific technical solution may also be: the angle between the two side edges of the flat mouth of the horn is α, and α is 90°±1°.

[0006] Furthermore, the length of the sensor nut is L, and L is 16 mm.

[0007] Furthermore, the hole depth of the bolt connection hole is H, and H is 10 mm.

[0008] Furthermore, the height of the flat mouth of the horn is h, and h is 2.8 mm.

[0009] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0010] In the utility model, since the end of the pressure sensor tube connection end is set as a trumpet flat mouth that is enlarged outward, when the sensor nut is tightened, the trumpet flat mouth of the pressure sensor tube end abuts against the boss, the tapered tube portion of the existing pressure sensor tube connection end can be removed, the connection structure is simplified, and the size of the connection end is shortened, so that the length of the sensor nut can be shortened accordingly. The length L of the sensor nut is shortened from 22mm in the prior art to 16mm, and the hole depth H of the bolt connection hole is shortened from 14.5mm in the prior art to 10mm, which saves materials and reduces the manufacturing cost of the tightening bolt and the sensor nut. The trumpet flat mouth directly abuts against the boss surface, thereby ensuring the sealing effect. In addition, the length of the sensor nut is shortened, and the hole depth is correspondingly shortened. During installation, the torque wrench does not need to be turned many times, and the work efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the prior art.

[0012] Figure 2 A schematic structural diagram of the utility model.

[0013] Figure 3 It is a structural schematic diagram of the pressure sensor tube of the utility model.

[0014] Figure 4 The utility model is a schematic diagram of the assembly structure of the sensor nut and the locking bolt.

[0015] Serial number description:

[0016] Sensor nut 1, boss 1-1, locking bolt 2, pressure sensor tube 3, horn flat mouth 3-1, bolt connection hole a1, three-way catalytic converter connection hole a2. DETAILED DESCRIPTION

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0018] like Figure 2-3 The utility model shown in the figure comprises a locking bolt 2, a sensor nut 1 and a pressure sensor tube 3. The core of the sensor nut is provided with an axial through hole, the through hole comprises a bolt connection hole a1 and a three-way catalytic converter connection hole a2. The inner diameter of the bolt connection hole a1 is larger than the inner diameter of the three-way catalytic converter connection hole a2. The connection between the bolt connection hole a1 and the three-way catalytic converter connection hole a2 is a boss 1-1 extending into the hole. The end of the connection end of the pressure sensor tube 3 is set as a trumpet flat mouth 3-1 enlarged outward. The angle between the edges of the trumpet flat mouth on both sides is α, and α is 90°±1°. When the sensor nut 1 is tightened, the trumpet flat mouth 3-1 of the end of the pressure sensor tube 3 abuts against the boss 1-1, ensuring the sealing effect. Moreover, such a sealing structure can achieve the required torque without a large deformation during the tightening of the bolt, thereby improving production efficiency. The conical tube portion of the existing pressure sensor tube connection end is removed, and the end of the pressure sensor tube 3 connection end is designed as a trumpet flat mouth, the height of the trumpet flat mouth is h, h is 2.8mm, which simplifies the connection structure and shortens the size of the connection end, so that the length of the sensor nut can be shortened accordingly. The length L of the sensor nut is shortened from 22mm in the prior art to 16mm, and the hole depth H of the bolt connection hole is shortened from 14.5mm in the prior art to 10mm, which saves materials and reduces the manufacturing cost of the tightening bolts and sensor nuts.

Claims

1. A three-way catalytic converter pressure sensor tube connection structure, comprising a locking bolt, a sensor nut and a pressure sensor tube, wherein the core of the sensor nut is provided with an axial through hole, the through hole comprising a bolt connection hole and a three-way catalytic converter connection hole, the inner diameter of the bolt connection hole being larger than the inner diameter of the three-way catalytic converter connection hole, characterized in that: The connection between the bolt connection hole and the three-way catalytic converter connection hole is a boss extending into the hole, and the end of the pressure sensor tube connection end is set as a trumpet flat mouth that is enlarged outward; when the sensor nut is tightened, the trumpet flat mouth of the pressure sensor tube end is in contact with the boss.

2. The three-way catalytic converter pressure sensor tube connection structure according to claim 1, characterized in that: The angle between the two side edges of the flat mouth of the horn is α, and α is 90°±1°.

3. The three-way catalytic converter pressure sensor tube connection structure according to claim 1 or 2, characterized in that: The length of the sensor nut is L, and L is 16 mm.

4. The three-way catalytic converter pressure sensor tube connection structure according to claim 3, characterized in that: The hole depth of the bolt connection hole is H, and H is 10 mm.

5. The three-way catalytic converter pressure sensor tube connection structure according to claim 4, characterized in that: The height of the flat mouth of the horn is h, and h is 2.8 mm.

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