Extended joint structure

Abstract

Provided is an extended joint structure, which includes a sleeve body and a catalytic structure. The sleeve body is provided with an air inlet, an air outlet, and a catalytic chamber, one end of sleeve body is connected to an air exhaust pipe, and the other end of the sleeve body is connected to an oxygen sensor, so that the gas in the air exhaust pipe flows into the catalytic chamber through the air inlet and then flows out from the air outlet to the oxygen sensor; the catalytic structure is provided inside the catalytic chamber to catalyze the gas flowing through the catalytic chamber to improve the quality of the gas flowing out from the air outlet. This application has the effect of improving the detection environment of oxygen sensors by catalytic treatment of flowing gas, thereby enhancing the stability of detection signals.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automotive exhaust system, and in particular, to an extended joint structure.BACKGROUND

[0002] In the existing automotive exhaust system, an oxygen sensor (O2 Sensor) is usually installed on the exhaust pipe to detect the oxygen content in the exhaust and feedback the detection signal to the vehicle engine control unit (ECU) to adjust the fuel injection ratio and monitor the working state of the three-way catalyst. In general, the exhaust system is equipped with at least a front oxygen sensor and a rear oxygen sensor, where the front oxygen sensor is used to monitor the combustion state and the rear oxygen sensor is used to monitor the purification efficiency of the three-way catalyst. When the three-way catalytic converter of a vehicle ages, is damaged, or is replaced with a high flow exhaust system, the oxygen content detected by the rear oxygen sensor does not match the parameters preset by the engine control unit, which can easily trigger a fault code and turn on the Check Engine Light. To solve this problem, existing technology usually uses an extension joint (O2 Sensor Spacer) installed between the exhaust pipe and the oxygen sensor.

[0003] The existing extension joint is usually a hollow metal structure sleeve, with one end of the sleeve connected to the exhaust pipe and the other end connected to the oxygen sensor, thereby extending the oxygen sensor to the exhaust pipe position. This allows the oxygen sensor probe to move away from the main exhaust gas flow, reducing the direct impact of gas from the exhaust pipe on the oxygen sensor, thereby reducing the phenomenon of triggering fault codes and lighting up Check Engine Light in the oxygen sensor.

[0004] Regarding the relevant technologies mentioned above, the extension joint only reduces the degree of direct gas flow into the oxygen sensor by simply extending the distance, which has limited ability to improve the detection environment of the oxygen sensor. Therefore, it may still be unable to effectively improve the detection environment of the oxygen sensor in some vehicles or exhaust conditions, and the adaptability of the extension joint is insufficient.SUMMARY

[0005] In order to enhance the improvement effect of the extended joint on the detection environment of oxygen sensors, this application provides an extended joint structure.

[0006] The extension joint structure provided in this application adopts the following technical solution.

[0007] An extended joint structure, including:

[0008] a sleeve body, and the sleeve body is provided with an air inlet, an air outlet, and a catalytic chamber; where one end of the sleeve body is connected to an air exhaust pipe, and the other end of the sleeve body is connected to an oxygen sensor; gas in the air exhaust pipe flows into the catalytic chamber after passing through the air inlet, and finally flows out to the oxygen sensor through the air outlet; and

[0009] a catalytic structure, and the catalytic structure is provided in the catalytic chamber and configured to catalyze the gas flowing through the catalytic chamber to improve the quality of the gas flowing out from the air outlet.

[0010] By adopting the above technical solution, when the air exhaust pipe is used for exhaust, the gas in the air exhaust pipe enters the catalytic chamber through the air inlet. When the gas enters the catalytic chamber and flows through it, the catalytic structure catalyzes the gas, thereby converting the components in the gas into carbon dioxide, nitrogen, and water through catalysis. As a result, when the gas flows out of the air outlet, the hydrocarbons and nitrogen oxides contained in the gas are reduced, thereby improving the detection environment of the oxygen sensor. This improves the degree to which the extension joint reduces the direct flow of gas into the oxygen sensor by simply extending the distance, and has limited ability to improve the detection environment of the oxygen sensor. Therefore, in some vehicles or exhaust conditions, it may still be unable to effectively improve the detection environment of the oxygen sensor, and the adaptability of the extension joint is insufficient.

[0011] In some embodiments of the present disclosure, the catalytic structure is provided with catalytic holes, and gas flowing through the catalytic holes is catalyzed by the catalytic structure.

[0012] In some embodiments of the present disclosure, the catalytic structure includes at least two tube body parts and a bending part, where each of the tube body parts is sequentially nested, and a size of each of the tube body parts gradually increases; the bending part is provided between adjacent two tube body parts and configured to fix the adjacent two tube body parts; the catalytic holes are formed between the bending part and the tube body parts.

[0013] In some embodiments of the present disclosure, a cross-section of each of the catalytic holes is triangular.

[0014] In some embodiments of the present disclosure, the catalytic chamber includes a buffer section and a catalytic section, the buffer section and the catalytic section are communicated, and the catalytic structure is arranged in the catalytic section.

[0015] In some embodiments of the present disclosure, a size of the catalytic structure is smaller than a size of the catalytic chamber, and the catalytic structure has a catalytic surface so that the gas flowing through the catalytic surface is catalyzed by the catalytic surface.

[0016] In some embodiments of the present disclosure, the sleeve body includes two sleeve parts, and the two sleeve parts are threaded together; where when the two sleeve parts are disconnected, the catalytic chamber opens to replace the catalytic structure.

[0017] In some embodiments of the present disclosure, an angle between normals of two end faces of the sleeve body is 45 degrees, 90 degrees, or 180 degrees.

[0018] In some embodiments of the present disclosure, the two ends of the sleeve body are fixedly connected via threaded structures to achieve a connection between the sleeve body and the air exhaust pipe and a connection between the sleeve body and the oxygen sensor.

[0019] In some embodiments of the present disclosure, one of the threaded structures is an internal thread, and another of the threaded structures is an external thread.

[0020] In summary, this application includes at least one beneficial technical effect as follows.

[0021] When the air exhaust pipe is used for exhaust, the gas from the air exhaust pipe enters the catalytic chamber through the air inlet. As the gas enters the catalytic chamber and flows through it, the catalytic structure catalyzes the gas, converting its components into carbon dioxide, nitrogen, and water. As a result, when the gas flows out from the air outlet, the amount of hydrocarbons and nitrogen oxides in the gas decreases, thereby improving the detection environment of the oxygen sensor. This also improves the ability of the extension joint to reduce the direct flow of gas into the oxygen sensor by simply extending the distance, which has limited ability to improve the detection environment of the oxygen sensor. Therefore, in some vehicles or exhaust conditions, it may still be unable to effectively improve the detection environment of the oxygen sensor, and improve the adaptability of the extension joint that is insufficient.BRIEF DESCRIPTION OF DRAWINGS

[0022] FIG. 1 is a first schematic diagram of an overall structure in an embodiment provided by the present application.

[0023] FIG. 2 is an explosive view of the overall structure of the embodiment provided by the present application.

[0024] FIG. 3 is a schematic diagram of a catalytic structure in an embodiment provided by the present application.

[0025] FIG. 4 is a second schematic diagram of the overall structure in an embodiment provided by the present application.

[0026] FIG. 5 is a third schematic diagram of the overall structure in an embodiment provided by the present application.NUMERAL REFERENCE1—sleeve body, 1a—air inlet, 1b—air outlet, 1c—catalytic chamber, 1d—threaded structure, 11—sleeve part, 2—catalytic structure, 2a—catalytic hole, 2b—catalytic surface, 21—tube body part, 22—bending part.DESCRIPTION OF EMBODIMENTS

[0028] Further detailed explanations of the present application will be provided in combination with FIGS. 1-5.

[0029] An embodiment of the present application discloses an extended joint structure. Referring to FIGS. 1-3, the extended joint structure includes a sleeve body 1 and a catalytic structure 2. The sleeve body 1 is provided with an air inlet 1a, an air outlet 1b, and a catalytic chamber 1c. One end of the sleeve body 1 is connected to an air exhaust pipe, and the other end of the sleeve body 1 is connected to an oxygen sensor. The gas in the air exhaust pipe flows into and passes through the catalytic chamber 1c from the air inlet 1a, and finally flows out from the air outlet 1b to the oxygen sensor. The catalytic structure 2 is provided in the catalytic chamber 1c and is configured to catalyze the gas flowing through the catalytic chamber 1c to improve the quality of the gas flowing out from the air outlet 1b. It should be understood that the sleeve body 1 refers to a load-bearing component that constitutes an outer contour and an internal flow channel of the extended joint, and its material can be set according to the actual situation, such as high temperature resistance stainless steel, it can also be other high-temperature resistant alloy materials, and this embodiment of the present application is not specifically limited to this. The functional positioning of the sleeve body 1 in this scheme is to provide a physical channel for gas circulation to achieve gas circulation between the air exhaust pipe and the oxygen sensor, and to extend the gas circulation distance between the air exhaust pipe and the oxygen sensor, thereby increasing the time for gas to undergo redox reactions and improving the detection environment of the oxygen sensor. Besides that, it should be understood that the catalytic structure 2 contains one or more catalytic active metal elements, among which the catalytic active metal elements are at least one or more of platinum (Pt), palladium (Pd), and rhodium (Rh), and this embodiment of the present application is not limited to this.

[0030] Referring to FIG. 3, in an embodiment of the present application, the catalytic structure 2 is provided with catalytic holes 2a. The gas flows through the catalytic holes 2a and is catalyzed by the catalytic structure 2, thereby increasing a contact area between catalytic structure 2 and gas, thereby improving the catalytic efficiency of the catalytic structure 2 for gas and enhancing its catalytic effect on the gas. Besides that, it can also reduce the flow velocity of gas, thereby increasing the flow time of gas passing through the catalytic chamber 1c and further increasing the oxidation-reduction time of gas.

[0031] Referring to FIGS. 1 to 3, in an implementation mode, the catalytic structure 2 includes at least two tube body parts 21 and a bending part 22, each tube body part 21 is sequentially nested, and the size of each tube body part 21 gradually increases. The bending part 22 is provided between adjacent tube body parts 21 and used to fix the adjacent tube body parts 21, and the catalytic holes 2a are formed between the bending part 22 and the tube body parts 21, in an implementation mode, the tube body parts 21 can refer to the cylindrical or tubular components that constitute a main body of the catalytic structure 2, which can be cylindrical, prismatic, or other regular geometric shapes. In this embodiment, the number of the tube body parts 21 is at least two, and the specific number of the tube body parts 21 is not limited. Each of the tube body parts 21 is sequentially nested according to the increasing size rule, that is, an outer diameter of an inner tube body part 21 is smaller than an inner diameter of an outer tube body part 21, thereby forming a circular or quasi circular gap space between adjacent tube body parts 21. The bending part 22 can be an independent annular gasket, a wavy connecting piece, or a structure formed by extending and bending from ends of the tube body parts 21. A connection way between the bending part 22 and the tube body parts 21 can be welding, riveting, snap connection, or fixed through interference fit, the specific connection form can be selected according to the actual processing capacity and strength requirements. The functional positioning of the bending part 22 in the overall technical solution is not only to provide structural support to maintain the coaxially or relative positional stability of the multi-layer tube body parts 21, but more importantly, the bending part 22 and side walls or end faces of the tube body parts 21 jointly enclose boundaries of the catalytic holes 2a. Through the specific shape design of the bending parts 22 (such as wave shape, sawtooth shape or step shape), cross-sectional shapes and flow areas of the catalytic holes 2a can be controlled, thereby affecting the turbulence degree and residence time of gas flow. In an implementation mode, the cross-sectional shapes of the catalytic holes 2a are triangular.

[0032] Referring to FIGS. 1-3, in an embodiment of the application, the catalytic chamber 1c includes a buffer section and a catalytic section. The buffer section and the catalytic section are communicated, and the catalytic structure 2 is located in the catalytic section. In an implementation mode, the buffer section refers to a cavity area in the catalytic chamber 1c where the catalytic structure 2 is not installed. The buffer section is used to preliminarily suppress the flow velocity and balance the pressure of the exhaust gas flowing in at high speed from the air exhaust pipe. The catalytic section refers to a cavity area where the catalytic structure is installed. The spatial shape of the catalytic section can be adapted according to the shape of the catalytic structure 2, such as cylindrical, square, or other irregular shapes. This embodiment of the present application does not have special limitations on this, so the exhaust gas flows through the catalytic chamber 1c, and it can sequentially pass through the buffer section, catalytic section, and buffer section, or sequentially passing through the buffer section and catalytic section, or catalytic section and buffer section. This application does not limit this.

[0033] Referring to FIGS. 1-3, in an embodiment of the present application, the size of catalytic structure 2 is smaller than that of the catalytic chamber 1c. The catalytic structure 2 has a catalytic surface 2b, so that there is a gap between the catalytic structure 2 and a cavity of the catalytic chamber 1c, allowing gas to flow through the catalytic surface 2b. This further increases the contact area between the catalytic structure 2 and gas when the gas flows through the catalytic surface 2b and is catalyzed by the catalytic surface 2b.

[0034] Referring to FIGS. 1-3, in an embodiment of the present application, the sleeve body includes two sleeve parts 11, and two sleeve parts 11 are threaded together. When the two sleeve parts 11 are disconnected, the catalytic chamber 1c is opened to replace the catalytic structure 2.

[0035] Referring to FIGS. 1, 4, and 5, in an embodiment of the present application, an angle between normals of two end faces of the sleeve body 1 is 45 degrees, 90 degrees, or 180 degrees. In an implementation mode, the angle refers to the spatial angle formed between the normals of an end face where the air inlet 1a is located and an end face where the air outlet 1b is located, in an axial direction of the sleeve body 1. The setting of this angle is intended to adapt to the spatial position and orientation requirements of the oxygen sensor installation holes in the exhaust system of different vehicle models. The specific value of the angle can be set according to the actual situation, for example, it can be 45 degrees, 90 degrees, or 180 degrees. The embodiments of the present application do not make special limitations on this. When the angle is 180 degrees, the sleeve body 1 presents a straight cylindrical structure, and the air inlet 1a and the air outlet 1b are coaxial. When the angle is 90 degrees, the sleeve body 1 presents an L-shaped bending structure, with axes of the air inlet 1a and air outlet 1b being perpendicular to each other. When the angle is 45 degrees, the sleeve body 1 presents a diagonal transition structure. It should be noted that, in addition to the three typical angles mentioned above, the angle can also be designed as any other angle according to the customized requirements of the specific vehicle model, as long as it can achieve smooth connection between the two ends of the sleeve body 1 and the exhaust pipe, as well as the oxygen sensor.

[0036] Referring to FIGS. 1-3, in an embodiment of the present application, two ends of the sleeve body 1 are fixedly connected with threaded structures 1d to achieve a connection between the sleeve body 1 and the air exhaust pipe, as well as a connection between the sleeve body 1 and the oxygen sensor. In an implementation mode, one threaded structure 1d is an internal thread, and the other threaded structure 1d is an external thread.

[0037] The implementation principle of the extended joint structure in the present application is as follows: when the air exhaust pipe is used for exhaust, the gas in the air exhaust pipe enters the catalytic chamber 1c from the air inlet 1a. When the gas enters the catalytic chamber 1c and flows through it, the catalytic structure 2 catalyzes the gas, thereby converting the components in the gas into carbon dioxide, nitrogen, and water through catalysis. As a result, when the gas exits form the air outlet 1b, the amount of hydrocarbons and nitrogen oxides contained in the gas decreases, thereby improving the detection environment of the oxygen sensor. This also improves the ability of the extension joint to reduce the direct flow of gas into the oxygen sensor by simply extending the distance, which has limited ability to improve the detection environment of the oxygen sensor. Therefore, in some vehicles or exhaust conditions, it may still be unable to effectively improve the detection environment of the oxygen sensor and improve the problem that the adaptability of the extension joint is insufficient.

[0038] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, and improvements made within the structure, shape, and principles of the present application should be included within the protection scope of the present application.

Examples

Embodiment Construction

[0028]Further detailed explanations of the present application will be provided in combination with FIGS. 1-5.

[0029]An embodiment of the present application discloses an extended joint structure. Referring to FIGS. 1-3, the extended joint structure includes a sleeve body 1 and a catalytic structure 2. The sleeve body 1 is provided with an air inlet 1a, an air outlet 1b, and a catalytic chamber 1c. One end of the sleeve body 1 is connected to an air exhaust pipe, and the other end of the sleeve body 1 is connected to an oxygen sensor. The gas in the air exhaust pipe flows into and passes through the catalytic chamber 1c from the air inlet 1a, and finally flows out from the air outlet 1b to the oxygen sensor. The catalytic structure 2 is provided in the catalytic chamber 1c and is configured to catalyze the gas flowing through the catalytic chamber 1c to improve the quality of the gas flowing out from the air outlet 1b. It should be understood that the sleeve body 1 refers to a load-b...

TECHNICAL FIELD

[0001] The present application relates to the field of automotive exhaust system, and in particular, to an extended joint structure.BACKGROUND

[0002] In the existing automotive exhaust system, an oxygen sensor (O2 Sensor) is usually installed on the exhaust pipe to detect the oxygen content in the exhaust and feedback the detection signal to the vehicle engine control unit (ECU) to adjust the fuel injection ratio and monitor the working state of the three-way catalyst. In general, the exhaust system is equipped with at least a front oxygen sensor and a rear oxygen sensor, where the front oxygen sensor is used to monitor the combustion state and the rear oxygen sensor is used to monitor the purification efficiency of the three-way catalyst. When the three-way catalytic converter of a vehicle ages, is damaged, or is replaced with a high flow exhaust system, the oxygen content detected by the rear oxygen sensor does not match the parameters preset by the engine control unit, which can easily trigger a fault code and turn on the Check Engine Light. To solve this problem, existing technology usually uses an extension joint (O2 Sensor Spacer) installed between the exhaust pipe and the oxygen sensor.

[0003] The existing extension joint is usually a hollow metal structure sleeve, with one end of the sleeve connected to the exhaust pipe and the other end connected to the oxygen sensor, thereby extending the oxygen sensor to the exhaust pipe position. This allows the oxygen sensor probe to move away from the main exhaust gas flow, reducing the direct impact of gas from the exhaust pipe on the oxygen sensor, thereby reducing the phenomenon of triggering fault codes and lighting up Check Engine Light in the oxygen sensor.

[0004] Regarding the relevant technologies mentioned above, the extension joint only reduces the degree of direct gas flow into the oxygen sensor by simply extending the distance, which has limited ability to improve the detection environment of the oxygen sensor. Therefore, it may still be unable to effectively improve the detection environment of the oxygen sensor in some vehicles or exhaust conditions, and the adaptability of the extension joint is insufficient.SUMMARY

[0005] In order to enhance the improvement effect of the extended joint on the detection environment of oxygen sensors, this application provides an extended joint structure.

[0006] The extension joint structure provided in this application adopts the following technical solution.

[0007] An extended joint structure, including:

[0008] a sleeve body, and the sleeve body is provided with an air inlet, an air outlet, and a catalytic chamber; where one end of the sleeve body is connected to an air exhaust pipe, and the other end of the sleeve body is connected to an oxygen sensor; gas in the air exhaust pipe flows into the catalytic chamber after passing through the air inlet, and finally flows out to the oxygen sensor through the air outlet; and

[0009] a catalytic structure, and the catalytic structure is provided in the catalytic chamber and configured to catalyze the gas flowing through the catalytic chamber to improve the quality of the gas flowing out from the air outlet.

[0010] By adopting the above technical solution, when the air exhaust pipe is used for exhaust, the gas in the air exhaust pipe enters the catalytic chamber through the air inlet. When the gas enters the catalytic chamber and flows through it, the catalytic structure catalyzes the gas, thereby converting the components in the gas into carbon dioxide, nitrogen, and water through catalysis. As a result, when the gas flows out of the air outlet, the hydrocarbons and nitrogen oxides contained in the gas are reduced, thereby improving the detection environment of the oxygen sensor. This improves the degree to which the extension joint reduces the direct flow of gas into the oxygen sensor by simply extending the distance, and has limited ability to improve the detection environment of the oxygen sensor. Therefore, in some vehicles or exhaust conditions, it may still be unable to effectively improve the detection environment of the oxygen sensor, and the adaptability of the extension joint is insufficient.

[0011] In some embodiments of the present disclosure, the catalytic structure is provided with catalytic holes, and gas flowing through the catalytic holes is catalyzed by the catalytic structure.

[0012] In some embodiments of the present disclosure, the catalytic structure includes at least two tube body parts and a bending part, where each of the tube body parts is sequentially nested, and a size of each of the tube body parts gradually increases; the bending part is provided between adjacent two tube body parts and configured to fix the adjacent two tube body parts; the catalytic holes are formed between the bending part and the tube body parts.

[0013] In some embodiments of the present disclosure, a cross-section of each of the catalytic holes is triangular.

[0014] In some embodiments of the present disclosure, the catalytic chamber includes a buffer section and a catalytic section, the buffer section and the catalytic section are communicated, and the catalytic structure is arranged in the catalytic section.

[0015] In some embodiments of the present disclosure, a size of the catalytic structure is smaller than a size of the catalytic chamber, and the catalytic structure has a catalytic surface so that the gas flowing through the catalytic surface is catalyzed by the catalytic surface.

[0016] In some embodiments of the present disclosure, the sleeve body includes two sleeve parts, and the two sleeve parts are threaded together; where when the two sleeve parts are disconnected, the catalytic chamber opens to replace the catalytic structure.

[0017] In some embodiments of the present disclosure, an angle between normals of two end faces of the sleeve body is 45 degrees, 90 degrees, or 180 degrees.

[0018] In some embodiments of the present disclosure, the two ends of the sleeve body are fixedly connected via threaded structures to achieve a connection between the sleeve body and the air exhaust pipe and a connection between the sleeve body and the oxygen sensor.

[0019] In some embodiments of the present disclosure, one of the threaded structures is an internal thread, and another of the threaded structures is an external thread.

[0020] In summary, this application includes at least one beneficial technical effect as follows.

[0021] When the air exhaust pipe is used for exhaust, the gas from the air exhaust pipe enters the catalytic chamber through the air inlet. As the gas enters the catalytic chamber and flows through it, the catalytic structure catalyzes the gas, converting its components into carbon dioxide, nitrogen, and water. As a result, when the gas flows out from the air outlet, the amount of hydrocarbons and nitrogen oxides in the gas decreases, thereby improving the detection environment of the oxygen sensor. This also improves the ability of the extension joint to reduce the direct flow of gas into the oxygen sensor by simply extending the distance, which has limited ability to improve the detection environment of the oxygen sensor. Therefore, in some vehicles or exhaust conditions, it may still be unable to effectively improve the detection environment of the oxygen sensor, and improve the adaptability of the extension joint that is insufficient.BRIEF DESCRIPTION OF DRAWINGS

[0022] FIG. 1 is a first schematic diagram of an overall structure in an embodiment provided by the present application.

[0023] FIG. 2 is an explosive view of the overall structure of the embodiment provided by the present application.

[0024] FIG. 3 is a schematic diagram of a catalytic structure in an embodiment provided by the present application.

[0025] FIG. 4 is a second schematic diagram of the overall structure in an embodiment provided by the present application.

[0026] FIG. 5 is a third schematic diagram of the overall structure in an embodiment provided by the present application.NUMERAL REFERENCE1—sleeve body, 1a—air inlet, 1b—air outlet, 1c—catalytic chamber, 1d—threaded structure, 11—sleeve part, 2—catalytic structure, 2a—catalytic hole, 2b—catalytic surface, 21—tube body part, 22—bending part.DESCRIPTION OF EMBODIMENTS

[0028] Further detailed explanations of the present application will be provided in combination with FIGS. 1-5.

[0029] An embodiment of the present application discloses an extended joint structure. Referring to FIGS. 1-3, the extended joint structure includes a sleeve body 1 and a catalytic structure 2. The sleeve body 1 is provided with an air inlet 1a, an air outlet 1b, and a catalytic chamber 1c. One end of the sleeve body 1 is connected to an air exhaust pipe, and the other end of the sleeve body 1 is connected to an oxygen sensor. The gas in the air exhaust pipe flows into and passes through the catalytic chamber 1c from the air inlet 1a, and finally flows out from the air outlet 1b to the oxygen sensor. The catalytic structure 2 is provided in the catalytic chamber 1c and is configured to catalyze the gas flowing through the catalytic chamber 1c to improve the quality of the gas flowing out from the air outlet 1b. It should be understood that the sleeve body 1 refers to a load-bearing component that constitutes an outer contour and an internal flow channel of the extended joint, and its material can be set according to the actual situation, such as high temperature resistance stainless steel, it can also be other high-temperature resistant alloy materials, and this embodiment of the present application is not specifically limited to this. The functional positioning of the sleeve body 1 in this scheme is to provide a physical channel for gas circulation to achieve gas circulation between the air exhaust pipe and the oxygen sensor, and to extend the gas circulation distance between the air exhaust pipe and the oxygen sensor, thereby increasing the time for gas to undergo redox reactions and improving the detection environment of the oxygen sensor. Besides that, it should be understood that the catalytic structure 2 contains one or more catalytic active metal elements, among which the catalytic active metal elements are at least one or more of platinum (Pt), palladium (Pd), and rhodium (Rh), and this embodiment of the present application is not limited to this.

[0030] Referring to FIG. 3, in an embodiment of the present application, the catalytic structure 2 is provided with catalytic holes 2a. The gas flows through the catalytic holes 2a and is catalyzed by the catalytic structure 2, thereby increasing a contact area between catalytic structure 2 and gas, thereby improving the catalytic efficiency of the catalytic structure 2 for gas and enhancing its catalytic effect on the gas. Besides that, it can also reduce the flow velocity of gas, thereby increasing the flow time of gas passing through the catalytic chamber 1c and further increasing the oxidation-reduction time of gas.

[0031] Referring to FIGS. 1 to 3, in an implementation mode, the catalytic structure 2 includes at least two tube body parts 21 and a bending part 22, each tube body part 21 is sequentially nested, and the size of each tube body part 21 gradually increases. The bending part 22 is provided between adjacent tube body parts 21 and used to fix the adjacent tube body parts 21, and the catalytic holes 2a are formed between the bending part 22 and the tube body parts 21, in an implementation mode, the tube body parts 21 can refer to the cylindrical or tubular components that constitute a main body of the catalytic structure 2, which can be cylindrical, prismatic, or other regular geometric shapes. In this embodiment, the number of the tube body parts 21 is at least two, and the specific number of the tube body parts 21 is not limited. Each of the tube body parts 21 is sequentially nested according to the increasing size rule, that is, an outer diameter of an inner tube body part 21 is smaller than an inner diameter of an outer tube body part 21, thereby forming a circular or quasi circular gap space between adjacent tube body parts 21. The bending part 22 can be an independent annular gasket, a wavy connecting piece, or a structure formed by extending and bending from ends of the tube body parts 21. A connection way between the bending part 22 and the tube body parts 21 can be welding, riveting, snap connection, or fixed through interference fit, the specific connection form can be selected according to the actual processing capacity and strength requirements. The functional positioning of the bending part 22 in the overall technical solution is not only to provide structural support to maintain the coaxially or relative positional stability of the multi-layer tube body parts 21, but more importantly, the bending part 22 and side walls or end faces of the tube body parts 21 jointly enclose boundaries of the catalytic holes 2a. Through the specific shape design of the bending parts 22 (such as wave shape, sawtooth shape or step shape), cross-sectional shapes and flow areas of the catalytic holes 2a can be controlled, thereby affecting the turbulence degree and residence time of gas flow. In an implementation mode, the cross-sectional shapes of the catalytic holes 2a are triangular.

[0032] Referring to FIGS. 1-3, in an embodiment of the application, the catalytic chamber 1c includes a buffer section and a catalytic section. The buffer section and the catalytic section are communicated, and the catalytic structure 2 is located in the catalytic section. In an implementation mode, the buffer section refers to a cavity area in the catalytic chamber 1c where the catalytic structure 2 is not installed. The buffer section is used to preliminarily suppress the flow velocity and balance the pressure of the exhaust gas flowing in at high speed from the air exhaust pipe. The catalytic section refers to a cavity area where the catalytic structure is installed. The spatial shape of the catalytic section can be adapted according to the shape of the catalytic structure 2, such as cylindrical, square, or other irregular shapes. This embodiment of the present application does not have special limitations on this, so the exhaust gas flows through the catalytic chamber 1c, and it can sequentially pass through the buffer section, catalytic section, and buffer section, or sequentially passing through the buffer section and catalytic section, or catalytic section and buffer section. This application does not limit this.

[0033] Referring to FIGS. 1-3, in an embodiment of the present application, the size of catalytic structure 2 is smaller than that of the catalytic chamber 1c. The catalytic structure 2 has a catalytic surface 2b, so that there is a gap between the catalytic structure 2 and a cavity of the catalytic chamber 1c, allowing gas to flow through the catalytic surface 2b. This further increases the contact area between the catalytic structure 2 and gas when the gas flows through the catalytic surface 2b and is catalyzed by the catalytic surface 2b.

[0034] Referring to FIGS. 1-3, in an embodiment of the present application, the sleeve body includes two sleeve parts 11, and two sleeve parts 11 are threaded together. When the two sleeve parts 11 are disconnected, the catalytic chamber 1c is opened to replace the catalytic structure 2.

[0035] Referring to FIGS. 1, 4, and 5, in an embodiment of the present application, an angle between normals of two end faces of the sleeve body 1 is 45 degrees, 90 degrees, or 180 degrees. In an implementation mode, the angle refers to the spatial angle formed between the normals of an end face where the air inlet 1a is located and an end face where the air outlet 1b is located, in an axial direction of the sleeve body 1. The setting of this angle is intended to adapt to the spatial position and orientation requirements of the oxygen sensor installation holes in the exhaust system of different vehicle models. The specific value of the angle can be set according to the actual situation, for example, it can be 45 degrees, 90 degrees, or 180 degrees. The embodiments of the present application do not make special limitations on this. When the angle is 180 degrees, the sleeve body 1 presents a straight cylindrical structure, and the air inlet 1a and the air outlet 1b are coaxial. When the angle is 90 degrees, the sleeve body 1 presents an L-shaped bending structure, with axes of the air inlet 1a and air outlet 1b being perpendicular to each other. When the angle is 45 degrees, the sleeve body 1 presents a diagonal transition structure. It should be noted that, in addition to the three typical angles mentioned above, the angle can also be designed as any other angle according to the customized requirements of the specific vehicle model, as long as it can achieve smooth connection between the two ends of the sleeve body 1 and the exhaust pipe, as well as the oxygen sensor.

[0036] Referring to FIGS. 1-3, in an embodiment of the present application, two ends of the sleeve body 1 are fixedly connected with threaded structures 1d to achieve a connection between the sleeve body 1 and the air exhaust pipe, as well as a connection between the sleeve body 1 and the oxygen sensor. In an implementation mode, one threaded structure 1d is an internal thread, and the other threaded structure 1d is an external thread.

[0037] The implementation principle of the extended joint structure in the present application is as follows: when the air exhaust pipe is used for exhaust, the gas in the air exhaust pipe enters the catalytic chamber 1c from the air inlet 1a. When the gas enters the catalytic chamber 1c and flows through it, the catalytic structure 2 catalyzes the gas, thereby converting the components in the gas into carbon dioxide, nitrogen, and water through catalysis. As a result, when the gas exits form the air outlet 1b, the amount of hydrocarbons and nitrogen oxides contained in the gas decreases, thereby improving the detection environment of the oxygen sensor. This also improves the ability of the extension joint to reduce the direct flow of gas into the oxygen sensor by simply extending the distance, which has limited ability to improve the detection environment of the oxygen sensor. Therefore, in some vehicles or exhaust conditions, it may still be unable to effectively improve the detection environment of the oxygen sensor and improve the problem that the adaptability of the extension joint is insufficient.

[0038] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, and improvements made within the structure, shape, and principles of the present application should be included within the protection scope of the present application.

Examples

Embodiment Construction

[0028]Further detailed explanations of the present application will be provided in combination with FIGS. 1-5.

[0029]An embodiment of the present application discloses an extended joint structure. Referring to FIGS. 1-3, the extended joint structure includes a sleeve body 1 and a catalytic structure 2. The sleeve body 1 is provided with an air inlet 1a, an air outlet 1b, and a catalytic chamber 1c. One end of the sleeve body 1 is connected to an air exhaust pipe, and the other end of the sleeve body 1 is connected to an oxygen sensor. The gas in the air exhaust pipe flows into and passes through the catalytic chamber 1c from the air inlet 1a, and finally flows out from the air outlet 1b to the oxygen sensor. The catalytic structure 2 is provided in the catalytic chamber 1c and is configured to catalyze the gas flowing through the catalytic chamber 1c to improve the quality of the gas flowing out from the air outlet 1b. It should be understood that the sleeve body 1 refers to a load-b...

Claims

1. An extended joint structure, comprising:a sleeve body, and the sleeve body is provided with an air inlet, an air outlet, and a catalytic chamber; wherein one end of the sleeve body is connected to an air exhaust pipe, and the other end of the sleeve body is connected to an oxygen sensor; gas in the air exhaust pipe flows into the catalytic chamber after passing through the air inlet, and finally flows out to the oxygen sensor through the air outlet; anda catalytic structure, and the catalytic structure is provided in the catalytic chamber and configured to catalyze the gas flowing through the catalytic chamber to improve the quality of the gas flowing out from the air outlet.

2. The extended joint structure according to claim 1, wherein the catalytic structure is provided with catalytic holes, and gas flowing through the catalytic holes is catalyzed by the catalytic structure.

3. The extended joint structure according to claim 2, wherein the catalytic structure comprises at least two tube body parts and a bending part,wherein each of the tube body parts is sequentially nested, and a size of each of the tube body parts gradually increases; the bending part is provided between adjacent two tube body parts and configured to fix the adjacent two tube body parts;the catalytic holes are formed between the bending part and the tube body parts.

4. The extended joint structure according to claim 3, wherein a cross-section of each of the catalytic holes is triangular.

5. The extended joint structure according to claim 1, wherein the catalytic chamber comprises a buffer section and a catalytic section, the buffer section and the catalytic section are communicated, and the catalytic structure is arranged in the catalytic section.

6. The extended joint structure according to claim 1, wherein a size of the catalytic structure is smaller than a size of the catalytic chamber, and the catalytic structure has a catalytic surface so that the gas flowing through the catalytic surface is catalyzed by the catalytic surface.

7. The extended joint structure according to claim 1, wherein the sleeve body comprises two sleeve parts, and the two sleeve parts are threaded together;wherein when the two sleeve parts are disconnected, the catalytic chamber opens to replace the catalytic structure.

8. The extended joint structure according to claim 1, wherein an angle between normals of two end faces of the sleeve body is 45 degrees, 90 degrees, or 180 degrees.

9. The extended joint structure according to claim 1, wherein the two ends of the sleeve body are fixedly connected via threaded structures to achieve a connection between the sleeve body and the air exhaust pipe and a connection between the sleeve body and the oxygen sensor.

10. The extended joint structure according to claim 9, wherein one of the threaded structures is an internal thread, and another of the threaded structures is an external thread.

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