Exhaust gas purification device for vehicle

Abstract

The utility model provides a waste gas purification device of a vehicle, a waste gas sensor of the waste gas purification device can be conveniently assembled and stably positioned, and the assembly precision of the waste gas sensor can be improved. An exhaust gas purification device for a vehicle comprises: a cylindrical catalyst holding part for holding a catalyst, the upstream side of the catalyst holding part having an upstream cone part, the downstream side of the catalyst holding part having a downstream cone part, and at least one of the upstream cone part and the downstream cone part having a single boss; and the at least one group of waste gas sensors are arranged on at least one of the upstream cone part and the downstream cone part, the at least one group of waste gas sensors are arranged on the single boss, and the at least one group of waste gas sensors are arranged in parallel along the waste gas flow direction of the catalyst holding part.

Description

Technical Field

[0001] The utility model relates to an exhaust gas purification device, in particular to an exhaust gas purification device for a vehicle. Background Art

[0002] Since then, efforts have continued to be made to mitigate climate change or reduce its impact. To achieve this goal, research and development related to exhaust gas purification devices are underway. In the development of vehicle exhaust gas purification devices, two exhaust gas sensors are generally respectively arranged on two bosses, and the two bosses are mounted on the exhaust pipe by welding. In order to take into account weldability, there must be a sufficient distance between the two bosses, and in order to take into account the sensing effect of the exhaust gas sensor, the installation direction of the bosses is restricted. Therefore, when the installation space is limited, it is difficult to properly arrange two bosses corresponding to the two sensors. Therefore, it is necessary to improve the vehicle exhaust gas purification device to overcome the above-mentioned problems. Utility Model Content

[0003] The utility model provides an exhaust gas purification device for a vehicle, wherein an exhaust gas sensor of the exhaust gas purification device can be conveniently assembled and stably positioned, and the assembly accuracy of the exhaust gas sensor can be improved.

[0004] The utility model provides an exhaust gas purification device for a vehicle, comprising: a cylindrical catalyst retaining portion for retaining a catalyst, wherein the upstream side of the catalyst retaining portion has an upstream cone portion, the downstream side of the catalyst retaining portion has a downstream cone portion, and at least one of the upstream cone portion and the downstream cone portion has a single boss; and at least one group of exhaust gas sensors, which are arranged on at least one of the upstream cone portion and the downstream cone portion, and the at least one group of exhaust gas sensors are arranged on the single boss, and the at least one group of exhaust gas sensors are installed in parallel along the exhaust gas flow direction of the catalyst retaining portion.

[0005] In an embodiment of the present utility model, the at least one group of exhaust gas sensors includes two groups of exhaust gas sensors, one group of the two groups of exhaust gas sensors includes an oxygen sensor and a first temperature sensor, and the other group of the two groups of exhaust gas sensors includes a nitrogen oxide sensor and a second temperature sensor, the oxygen sensor is located on the upstream side of the first temperature sensor in the exhaust gas flow direction, and the nitrogen oxide sensor is located on the upstream side of the second temperature sensor in the exhaust gas flow direction.

[0006] In an embodiment of the present invention, the oxygen sensor and the first temperature sensor are arranged in the upstream cone portion, and the nitrogen oxide sensor and the second temperature sensor are arranged in the downstream cone portion.

[0007] In an embodiment of the present invention, the upstream cone portion has a truncated conical upstream reduced diameter portion, the downstream cone portion has a truncated conical downstream reduced diameter portion, the single boss is welded on the inclined surface of the truncated conical upstream reduced diameter portion or the inclined surface of the truncated conical downstream reduced diameter portion, and the at least one group of exhaust gas sensors is arranged perpendicular to the exhaust gas flow direction.

[0008] Based on the above, in the vehicle exhaust purification device of the present invention, a group of exhaust gas sensors are mounted on a single boss. Consequently, compared to the traditional installation method of mounting a group of exhaust gas sensors on two separate bosses, the single boss of the present invention facilitates assembly and saves space, allowing the exhaust gas sensors to be installed in ideal locations that were previously difficult to install. Consequently, the exhaust gas sensors in the vehicle exhaust purification device of the present invention can be easily assembled and stably positioned, and the assembly accuracy of the exhaust gas sensors can be improved.

[0009] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a side view of an exhaust gas purification device for a vehicle according to an embodiment of the present invention;

[0011] Figure 2 yes Figure 1 A top view of a partial structure of an exhaust gas purification device.

[0012] Description of reference numerals:

[0013] 100: Vehicle exhaust purification device;

[0014] 110: catalyst holding portion;

[0015] 112: upstream cone;

[0016] 1121, 1141: single boss;

[0017] 114: downstream cone;

[0018] 120A, 120B: exhaust gas sensor;

[0019] 121A: oxygen sensor;

[0020] 121B: NOx sensor;

[0021] 122A: first temperature sensor;

[0022] 122B: second temperature sensor;

[0023] A1, A2, A3, A4: assembly axis;

[0024] D: exhaust gas flow direction;

[0025] E1, E2, E3, E4: extension part. DETAILED DESCRIPTION

[0026] Figure 1 It is a side view of an exhaust gas purification device for a vehicle according to an embodiment of the present invention. Figure 2 yes Figure 1 The top view of the exhaust gas purification device. Figure 1 and Figure 2 The vehicle exhaust gas purification device 100 of this embodiment includes a cylindrical catalyst holding portion 110. The catalyst holding portion 110 is used to hold a catalyst. Exhaust gas from the engine flows through the catalyst holding portion 110 and is purified by the catalyst before being discharged.

[0027] The catalyst retaining portion 110 has an upstream cone portion 112 on the upstream side of the exhaust gas flow direction D, and a downstream cone portion 114 on the downstream side of the exhaust gas flow direction D. The upstream cone portion 112 has a single boss 1121, and the downstream cone portion 114 has a single boss 1141. The vehicle exhaust gas purification device 100 also includes two sets of exhaust gas sensors 120A and 120B, which are respectively disposed in the upstream cone portion 112 and the downstream cone portion 114 of the catalyst retaining portion 110. One set of exhaust gas sensors 120A includes an oxygen sensor 121A and a first temperature sensor 122A, while the other set of exhaust gas sensors 120B includes a nitrogen oxide sensor 121B and a second temperature sensor 122B.

[0028] The oxygen sensor 121A and the first temperature sensor 122A are mounted on a single boss 1121 of the upstream cone 112. The oxygen sensor 121A and the first temperature sensor 122A are mounted side by side along the exhaust gas flow direction D of the catalyst retaining portion 110, with the oxygen sensor 121A located upstream of the first temperature sensor 122A in the exhaust gas flow direction D. Compared to conventional installation methods that place a set of exhaust gas sensors on two bosses, the single boss 1121 of this embodiment facilitates assembly and saves space, allowing the oxygen sensor 121A and the first temperature sensor 122A to be installed in ideal locations that were previously difficult to install. Consequently, the oxygen sensor 121A and the first temperature sensor 122A can be easily assembled and stably positioned, improving the assembly accuracy of the oxygen sensor 121A and the first temperature sensor 122A.

[0029] Similarly, the NOx sensor 121B and the second temperature sensor 122B are mounted on a single boss 1141 of the downstream cone 114. The NOx sensor 121B and the second temperature sensor 122B are mounted side by side along the exhaust gas flow direction D of the catalyst retaining portion 110, with the NOx sensor 121B located upstream of the second temperature sensor 122B in the exhaust gas flow direction D. Thus, compared to the conventional mounting method of mounting a set of exhaust gas sensors on two bosses, the single boss 1141 of this embodiment facilitates assembly and saves space, allowing the NOx sensor 121B and the second temperature sensor 122B to be mounted in ideal locations that were previously difficult to install. Consequently, the NOx sensor 121B and the second temperature sensor 122B can be easily assembled and stably positioned, and the assembly accuracy of the NOx sensor 121B and the second temperature sensor 122B can be improved.

[0030] The upstream oxygen sensor 121A and first temperature sensor 122A, and the downstream nitrogen oxide sensor 121B and second temperature sensor 122B, enable reliable determination of catalyst degradation within the catalyst retaining portion 110. Furthermore, in the exhaust gas sensor set 120A, since the first temperature sensor 122A, having a longer extension E2, is positioned downstream of the oxygen sensor 121A, having a shorter extension E1, even though the oxygen sensor 121A and the first temperature sensor 122A are positioned close together on a single boss 1121, the sensing effect of the downstream first temperature sensor 122A can be prevented from being excessively affected by the eddy currents generated by the upstream oxygen sensor 121A. Similarly, at another set of exhaust gas sensors 120B, since the second temperature sensor 122B having a longer extension portion E4 is arranged on the downstream side of the nitrogen oxide sensor 121B having a shorter extension portion E3, even if the nitrogen oxide sensor 121B and the second temperature sensor 122B are arranged on a single boss 1141 and the distance between them is closer, the sensing of the downstream second temperature sensor 122B can still be avoided from being excessively affected by the eddy current caused by the upstream nitrogen oxide sensor 121B.

[0031] Please refer to Figure 1In this embodiment, a set of exhaust gas sensors 120A cooperates with a single boss 1121, so that the oxygen sensor 121A and the first temperature sensor 122A are respectively arranged along the assembly axes A1 and A2 of the single boss 1121, perpendicular to the exhaust gas flow direction D. Furthermore, in this embodiment, the upstream cone portion 112 includes a frusto-conical upstream reduced diameter portion 1122. The single boss 1121 is manufactured, for example, using a lost wax process and welded to the inclined surface 1122a of the frusto-conical upstream reduced diameter portion 1122. This allows the assembly axes A1 and A2 of the single boss 1121 to be precisely aligned perpendicular to the exhaust gas flow direction D.

[0032] Similarly, in this embodiment, another exhaust gas sensor 120B cooperates with a single boss 1141, so that the nitrogen oxide sensor 121B and the second temperature sensor 122B are respectively arranged along the assembly axes A3 and A4 of the single boss 1141, perpendicular to the exhaust gas flow direction D. Furthermore, in this embodiment, the downstream cone portion 114 includes a frusto-conical upstream reduced diameter portion 1142. The single boss 1141 is manufactured, for example, using a lost wax process and welded to the inclined surface 1142a of the frusto-conical downstream reduced diameter portion 1142. This allows the assembly axes A3 and A4 of the single boss 1141 to be precisely aligned perpendicular to the exhaust gas flow direction D.

[0033] In summary, in the vehicle exhaust purification device of the present invention, a group of exhaust gas sensors are mounted on a single boss. Consequently, compared to the traditional installation method of mounting a group of exhaust gas sensors on two separate bosses, the single boss of the present invention facilitates assembly and saves space, allowing exhaust gas sensors to be installed in ideal locations that were previously difficult to install. Consequently, the exhaust gas sensors in the vehicle exhaust purification device of the present invention can be easily assembled and stably positioned, and the assembly accuracy of the exhaust gas sensors can be improved.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle exhaust gas purification device, characterized in that: include: a cylindrical catalyst holding portion for holding a catalyst, wherein the upstream side of the catalyst holding portion has an upstream cone portion, the downstream side of the catalyst holding portion has a downstream cone portion, and at least one of the upstream cone portion and the downstream cone portion has a single boss; and At least one set of exhaust gas sensors is provided in at least one of the upstream cone portion and the downstream cone portion, The at least one set of exhaust gas sensors is arranged on the single boss, The at least one set of exhaust gas sensors is installed in parallel along the exhaust gas flow direction of the catalyst holding portion.

2. The vehicle exhaust gas purification device according to claim 1, characterized in that: The at least one set of exhaust gas sensors includes two sets of exhaust gas sensors, one set of exhaust gas sensors in the two sets of exhaust gas sensors includes an oxygen sensor and a first temperature sensor, and the other set of exhaust gas sensors in the two sets of exhaust gas sensors includes a nitrogen oxide sensor and a second temperature sensor. The oxygen sensor is located upstream of the first temperature sensor in the exhaust gas flow direction. The nitrogen oxide sensor is located upstream of the second temperature sensor in the exhaust gas flow direction.

3. The vehicle exhaust gas purification device according to claim 2, characterized in that: The oxygen sensor and the first temperature sensor are arranged in the upstream cone portion, The nitrogen oxide sensor and the second temperature sensor are disposed in the downstream cone portion.

4. The vehicle exhaust gas purification device according to any one of claims 1 to 3, characterized in that: The upstream cone portion has a frustoconical upstream reduced diameter portion, The downstream cone portion has a frustoconical downstream reduced diameter portion, The single boss is welded to the inclined surface of the frustoconical upstream reduced diameter portion or the inclined surface of the frustoconical downstream reduced diameter portion. The at least one set of exhaust gas sensors is arranged perpendicular to the exhaust gas flow direction.

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