Nitrogen-oxygen sensor with anti-overflow structure

Abstract

The utility model relates to the field of nitrogen-oxygen sensors, in particular to a nitrogen-oxygen sensor with an anti-overflow structure, and aims to solve the technical problem that when an existing nitrogen-oxygen sensor is mounted on an automobile exhaust pipe for use, leakage is caused by a gap at a joint due to vibration of the exhaust pipe. According to the technical scheme, the nitrogen-oxygen sensor with the overflow-proof structure comprises a sensor body, a first-stage plug, a second-stage plug, a skirt edge plate, a screw sleeve, a deformation groove, a rubber sealing piece and a pin lock mechanism, according to the utility model, the original internal thread installation mode of the nitrogen-oxygen sensor and the tail gas pipe is improved into the external thread installation mode, and the rubber sealing element is combined, so that in the gradual tightening and fixing process, the structural gap can be filled through the deformation of the sealing element, and the tail gas overflow caused by the loosening of the threaded connection structure due to the vibration of the tail gas pipe is prevented; the problem that when an existing nitrogen-oxygen sensor is installed on an automobile exhaust pipe for use, leakage is caused by gaps at the joint due to vibration of the exhaust pipe is solved.

Description

Technical Field

[0001] The utility model relates to the field of nitrogen oxygen sensors, in particular to a nitrogen oxygen sensor with an anti-leakage structure. Background Art

[0002] Cars are now one of the indispensable means of transportation in people's lives, but when cars are in use, they will produce exhaust gas. The exhaust gas of cars contains nitrogen oxides that are harmful to the human body. The amount of nitrogen oxides produced by different cars is different. In order to judge and analyze whether the exhaust gas emitted by the car is qualified, a nitrogen oxide sensor will be installed on the car for detection.

[0003] The nitrogen oxygen sensor is mainly composed of a probe, a connecting wire and a control box. A circuit board is arranged in the control box. One end of the connecting wire is connected to the probe, and the other end of the connecting wire is connected to one end of the control box. The probe is provided with an external thread, and the probe is installed on the exhaust pipe of the automobile through a threaded connection structure. During the driving of the automobile, the joint between the exhaust pipe and the probe will vibrate, causing the connection between the probe and the exhaust pipe of the automobile to loosen and generate a gap, resulting in leakage of automobile exhaust gas, which in turn affects the detection function of the nitrogen oxygen sensor.

[0004] Therefore, in view of the fact that when the current nitrogen oxide sensor is installed on the automobile tail pipe, the vibration of the tail pipe may cause gaps in the joints and lead to leakage. A nitrogen oxide sensor with an anti-vibration leakage structure can be designed to ensure its normal use on the automobile tail pipe. Utility Model Content

[0005] In order to overcome the problem that when the current nitrogen oxygen sensor is installed on the automobile exhaust pipe, the vibration of the exhaust pipe will cause gaps in the joints and cause leakage.

[0006] The technical scheme of the utility model is: a nitrogen oxygen sensor with an anti-leakage structure, comprising a control machine, a control cable, a sensor body, a primary plug, a secondary plug, a skirt plate, a screw sleeve, a deformation groove, a rubber seal, and a pin locking mechanism; one end of the sensor body is connected to the control machine through the control cable, and the other end is extended to be connected with a primary plug, a secondary plug is slidably sleeved on the outer side of the primary plug, the primary plug and the secondary plug are plugged into the inside of the tailpipe, a side of the secondary plug facing the sensor body is fixedly connected with a skirt plate, a screw sleeve with an internal thread is integrally connected to the outside of the connection between the sensor body and the primary plug, the screw sleeve is threadedly connected to the tailpipe with an external thread, a circle of deformation grooves with a trapezoidal cross-section is provided on the inner wall of the screw sleeve, a rubber seal is arranged between the inner wall of the screw sleeve and the outer wall of the primary plug, the rubber seal is on the side of the skirt plate facing the sensor body, the rubber seal is squeezed and deformed by the skirt plate and filled into the deformation groove to seal the structural gap, and a pin locking mechanism is arranged on the end of the screw sleeve away from the sensor body and fixed with a pin hole on the outer wall of the tailpipe.

[0007] Preferably, the internal thread structure of the exhaust pipe is improved to an external thread structure, and a pin hole structure is added, so that the original internal thread installation method of the nitrogen oxide sensor and the exhaust pipe is improved to an external thread installation method of a screw sleeve screw connection. In the process of gradual tightening and fixing, the extrusion deformation of the rubber seal is used to fill the structural gap, and at the moment of complete tightening and fixing, the pin lock mechanism of the elastic lock is automatically locked with the pin hole on the exhaust pipe to prevent the exhaust pipe from vibrating during driving and causing the nitrogen oxide sensor to loosen, thereby preventing exhaust gas leakage.

[0008] Preferably, a limiting ring is fixedly connected to the outer wall of the first-level plug away from the sensor body, and a sliding groove is provided on the inner wall of the second-level plug. The limiting ring is located on the inner side of the sliding groove. The limiting ring and the inner wall of the sliding groove form a limiting structure, which allows the second-level plug to slide along the outer side of the first-level plug while preventing the second-level plug from falling out when it slides to the end of the first-level plug.

[0009] Preferably, a spring coil is sleeved on the outer side of the first-level plug, and the spring coil is between the limit ring and the inner wall of the slide groove close to the skirt plate side. The spring coil has elastic elongation properties. When it is not installed with the exhaust pipe, the spring coil will have an elastic pushing effect on the second-level plug, causing it to extend to the outside of the first-level plug. During the screwing and installation process with the exhaust pipe, because the skirt plate is subjected to the pushing force of the exhaust pipe, the second-level plug moves toward the first-level plug, gradually compressing the spring coil, ensuring that the second-level plug moves slowly and evenly, and forming a uniform extrusion pressure on the rubber seal.

[0010] Preferably, the rubber seal is made of a highly elastic heat-resistant rubber material and has a plurality of hollow holes inside. The exhaust pipe threadedly connected to the sleeve is located between the sleeve and the secondary plug and rests against the skirt plate. The heat-resistant rubber material used for the rubber seal can be resin-vulcanized butyl rubber, silicone rubber and fluororubber products, which can work stably at high temperatures of 200-300 degrees for a long time, can withstand the high temperature of the exhaust pipe without coking, and use the hole structure inside itself to make its own deformation space larger.

[0011] Preferably, the exhaust pipe port and the skirt plate threadedly connected to the sleeve are in the same vertical plane as the middle of the deformation groove, and the rubber seal deformed and filled into the deformation groove is attached to the structural gap between the exhaust pipe, the sleeve and the skirt plate. After being extruded and deformed, the rubber seal will extend into the deformation groove, thereby sealing the gap between the exhaust pipe port, the skirt plate and the deformation groove, preventing the exhaust gas from overflowing outward through the structural gap and the gap of the threaded connection structure.

[0012] Preferably, the pin locking mechanism includes a ring seat, a telescopic hole, and a spring pin; the ring seat is fixedly connected to the outer wall of the end of the screw sleeve away from the sensor body, and the upper and lower ends of the ring seat are provided with telescopic holes, and the spring pins are inserted into the telescopic holes. After the screw sleeve and the exhaust pipe are completely threaded, the ring seat covers the pin hole on the exhaust pipe, and after the spring pin is inserted into the corresponding pin hole, the screw sleeve and the exhaust pipe will not be further separated.

[0013] Preferably, the spring pin consists of a pin, a ring piece fixed on the outer wall of the pin and a spring fixed on the ring piece. The ring piece and the spring elastically displace in the telescopic hole. The pin is inserted into the corresponding pin hole on the exhaust pipe. The spring on the spring pin has elastic elongation properties, which can push the ring piece to move in the telescopic hole, forcing the pin to move toward the pin hole on the outer wall of the exhaust pipe.

[0014] Beneficial effects of the utility model:

[0015] 1. By improving the original internal thread installation method of the nitrogen oxide sensor and the tail pipe to an external thread installation method, and combining it with a rubber seal, the structural gap can be filled by the deformation of the seal during the gradual tightening and fixing process, preventing the threaded connection structure from loosening due to the vibration of the tail pipe and causing exhaust gas leakage, thereby ensuring the working effectiveness of the nitrogen oxide sensor;

[0016] 2. By means of the pin lock mechanism set on the screw sleeve and the corresponding improvement of the outer wall of the exhaust pipe to increase the pin hole, the pin lock can be formed at the moment of tightening and fixing to prevent the sensor and the exhaust pipe from rotating loose relative to each other due to the vibration of the exhaust pipe and avoid the occurrence of excessive structural gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of the three-dimensional structure of the nitrogen oxide sensor and the tailpipe installation of the anti-leakage structure of the utility model is shown;

[0018] Figure 2 The diagram shows the external three-dimensional structure of the decomposed structure of the nitrogen oxide sensor with the anti-leakage structure of the utility model;

[0019] Figure 3 The diagram shows the internal three-dimensional structure of the nitrogen and oxygen sensor with an anti-leakage structure of the utility model;

[0020] Figure 4 The diagram shows the internal three-dimensional structure of the nitrogen oxide sensor and the exhaust pipe installed in the anti-leakage structure of the utility model;

[0021] Figure 5 The diagram shows the internal three-dimensional structure of the nitrogen oxygen sensor of the anti-leakage structure of the utility model in a state where the nitrogen oxygen sensor is separated from the tailpipe;

[0022] Figure 6What is shown is a schematic diagram of the three-dimensional structure of the nitrogen oxide sensor pin locking mechanism and the exhaust pipe of the anti-leakage structure of the utility model.

[0023] Explanation of the reference numerals: 1. control machine; 2. control cable; 3. sensor body; 4. primary plug; 5. secondary plug; 6. skirt plate; 7. screw sleeve; 8. deformation groove; 9. rubber seal; 11. limit ring; 12. slide groove; 13. spring ring; 1001. ring seat; 1002. telescopic hole; 1003. spring pin. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-4 The utility model provides an embodiment: a nitrogen oxygen sensor with an anti-leakage structure, comprising a control machine 1, a control cable 2, a sensor body 3, a primary plug 4, a secondary plug 5, a skirt plate 6, a screw sleeve 7, a deformation groove 8, a rubber seal 9, and a pin locking mechanism; one end of the sensor body 3 is connected to the control machine 1 through the control cable 2, and the other end is extended to be connected with the primary plug 4, the outer side of the primary plug 4 is slidably sleeved with the secondary plug 5, the primary plug 4 and the secondary plug 5 are plugged into the inside of the exhaust pipe, and the side of the secondary plug 5 facing the sensor body 3 is fixedly connected with the skirt plate 6, the connection between the sensor body 3 and the primary plug 4 is integrally connected with a screw sleeve 7 with an internal thread, the screw sleeve 7 is threadedly connected to the exhaust pipe with an external thread, the inner wall of the screw sleeve 7 is provided with a circle of deformation grooves with a trapezoidal cross-section, the inner wall of the screw sleeve 7 and the primary plug 4 are connected A rubber seal 9 is arranged between the outer walls. The rubber seal 9 is located on the side of the skirt plate 6 facing the sensor body 3. The rubber seal 9 is squeezed and deformed by the skirt plate 6 and filled into the deformation groove 8 to seal the structural gap. The end of the screw sleeve 7 away from the sensor body 3 is provided with a pin locking mechanism fixed to the pin hole on the outer wall of the tail pipe. The internal thread structure of the tail pipe is improved to an external thread structure, and a pin hole structure is added. The original internal thread installation method of the nitrogen oxygen sensor and the tail pipe is improved to an external thread installation method of the screw sleeve 7. In the process of gradually tightening and fixing, the extrusion deformation of the rubber seal 9 is used to fill the structural gap, and at the moment of complete tightening and fixing, the pin locking mechanism of the elastic lock is automatically locked with the pin hole on the tail pipe to prevent the tail pipe from vibrating and loosening from the nitrogen oxygen sensor and exhaust gas leakage during the driving of the car.

[0026] See also Figure 3-6In this embodiment, a limiting ring 11 is fixedly connected to the outer wall of the primary plug 4 away from the sensor body 3, and a sliding groove 12 is opened on the inner wall of the secondary plug 5. The limiting ring 11 is located inside the sliding groove 12. The limiting ring 11 and the inner wall of the sliding groove 12 form a limiting structure, so that the secondary plug 5 can slide along the outer side of the primary plug 4, and at the same time, it can prevent the secondary plug 5 from slipping out when it slides to the end of the primary plug 4. A spring ring 13 is sleeved on the outer side of the primary plug 4. The spring ring 13 is located between the limiting ring 11 and the inner wall of the sliding groove 12 close to the skirt plate 6. The spring ring 13 has elastic elongation performance. When it is not installed with the exhaust pipe, the spring ring 13 will produce an elastic pushing effect on the secondary plug 5, so that it extends to the outside of the primary plug 4. During the screwing and installation process with the exhaust pipe, because the skirt plate 6 is subjected to the pushing force of the exhaust pipe, the secondary plug 5 moves toward the primary plug 4, and the spring ring 13 is gradually compressed, ensuring that the secondary plug 5 moves slowly and evenly, and the rubber seal 9 is pressed. A uniform extrusion pressure is formed. The rubber seal 9 is a highly elastic heat-resistant rubber material and has a plurality of hollow holes inside. The tail pipe threadedly connected and fixed with the screw sleeve 7 is located between the screw sleeve 7 and the secondary plug 5 and rests against the skirt plate 6. The heat-resistant rubber material used for the rubber seal 9 can be resin-vulcanized butyl rubber, silicone rubber and fluororubber products, which can work stably at a high temperature of 200-300 degrees for a long time, can resist the high temperature of the tail pipe without coking, and use its own internal hole structure to make its own deformation space larger. The tail pipe port threadedly connected and fixed with the screw sleeve 7 and the skirt plate 6 are both on the same vertical plane as the middle of the deformation groove 8. The rubber seal 9 deformed and filled into the deformation groove 8 is attached to the structural gap between the tail pipe and the screw sleeve 7 and the skirt plate 6. After being extruded and deformed, the rubber seal 9 will extend into the deformation groove 8, and the gap between the tail pipe port, the skirt plate 6 and the deformation groove 8 will be sealed to prevent the exhaust gas from overflowing through the structural gap and the gap of the threaded connection structure.

[0027] See also Figure 3 , 6In this embodiment, the pin locking mechanism includes a ring seat 1001, a telescopic hole 1002, and a spring pin 1003; the ring seat 1001 is fixedly connected to the outer wall of the screw sleeve 7 away from the end of the sensor body 3, and the upper and lower ends of the ring seat 1001 are provided with telescopic holes 1002, and the spring pin 1003 is inserted in the telescopic hole 1002. After the screw sleeve 7 is completely threaded with the exhaust pipe, the ring seat 1001 covers the position of the pin hole on the exhaust pipe. After the spring pin 1003 is inserted into the corresponding pin hole, the screw sleeve 7 and the exhaust pipe will not be further separated. The spring pin 1003 is composed of a pin, a ring piece fixed on the outer wall of the pin, and a spring fixed on the ring piece. The ring piece and the spring are elastically displaced in the telescopic hole 1002, and the pin is inserted in the corresponding pin hole on the exhaust pipe. The spring on the spring pin 1003 has elastic elongation performance, which can push the ring piece to move in the telescopic hole 1002, forcing the pin to move toward the pin hole on the outer wall of the exhaust pipe.

[0028] When working, the user aligns the sensor body 3 with the port of the automobile exhaust pipe, and inserts the primary plug 4 and the secondary plug 5 into the exhaust pipe until the screw sleeve 7 is sleeved on the exhaust pipe, and then twists the screw sleeve 7 to form a threaded connection relationship with the external thread on the outer wall of the exhaust pipe;

[0029] As the screw sleeve 7 is gradually tightened, the tailpipe port abuts against the skirt plate 6 and pushes the secondary plug 5, compressing the spring coil 13 while forming a uniform extrusion force on the rubber seal 9. When the skirt plate 6 and the tailpipe port move to the deformation groove 8, the rubber seal 9 deforms and completely fills the deformation groove 8, sealing the gap between the tailpipe port, the skirt plate 6 and the deformation groove 8;

[0030] At the same time, the threaded sleeve 7 is completely connected to the exhaust pipe, and the spring pin 1003 is inserted into the corresponding pin hole on the exhaust pipe to further lock the threaded sleeve 7 and the exhaust pipe.

[0031] Through the above steps, the original internal thread installation method of the nitrogen oxygen sensor and the tail pipe is improved to an external thread installation method, and combined with the rubber seal 9, in the process of gradually tightening and fixing, the structural gap can be filled by the deformation of the seal to prevent the threaded connection structure from loosening due to the vibration of the tail pipe and causing exhaust gas leakage, thereby ensuring the working effectiveness of the nitrogen oxygen sensor and solving the problem that when the current nitrogen oxygen sensor is installed on the automobile tail pipe for use, a gap will appear at the joint due to the vibration of the tail pipe, resulting in leakage.

[0032] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A nitrogen oxygen sensor with an anti-leakage structure, comprising a control machine (1), a control cable (2), and a sensor body (3); characterized in that: The sensor body (3) also includes a primary plug (4), a secondary plug (5), a skirt plate (6), a screw sleeve (7), a deformation groove (8), a rubber seal (9), and a pin locking mechanism; one end of the sensor body (3) is connected to the control machine (1) through a control cable (2), and the other end is extended to be connected with the primary plug (4); the secondary plug (5) is slidably sleeved on the outer side of the primary plug (4); the primary plug (4) and the secondary plug (5) are plugged into the inside of the exhaust pipe; the side of the secondary plug (5) facing the sensor body (3) is fixedly connected with the skirt plate (6); the connection between the sensor body (3) and the primary plug (4) is externally integrated. A screw sleeve (7) with an internal thread is connected, the screw sleeve (7) is threadedly connected to an exhaust pipe with an external thread, a circle of deformation grooves (8) with a trapezoidal cross section are provided on the inner wall of the screw sleeve (7), a rubber seal (9) is provided between the inner wall of the screw sleeve (7) and the outer wall of the first-stage plug (4), the rubber seal (9) is located on the side of the skirt plate (6) facing the sensor body (3), the rubber seal (9) is squeezed and deformed by the skirt plate (6) and fills into the deformation groove (8) to block the structural gap, and a pin lock mechanism is provided on the end of the screw sleeve (7) away from the sensor body (3) and fixed to the pin hole on the outer wall of the exhaust pipe.

2. The nitrogen oxygen sensor with an anti-leakage structure according to claim 1, characterized in that: A limiting ring (11) is fixedly connected to the outer wall of the primary plug (4) on the side away from the sensor body (3), a sliding groove (12) is provided on the inner wall of the secondary plug (5), and the limiting ring (11) is located inside the sliding groove (12).

3. The nitrogen oxygen sensor with an anti-leakage structure according to claim 1, characterized in that: A spring ring (13) is sleeved on the outer side of the primary plug (4), and the spring ring (13) is located between the limiting ring (11) and the inner wall of the slide groove (12) close to the skirt plate (6).

4. The nitrogen oxygen sensor with an anti-leakage structure according to claim 1, characterized in that: The rubber seal (9) is made of a highly elastic heat-resistant rubber material and has a plurality of hollow holes inside. The tailpipe, which is threadedly connected and fixed to the screw sleeve (7), is located between the screw sleeve (7) and the secondary plug (5) and abuts against the skirt plate (6).

5. The nitrogen oxygen sensor with an anti-leakage structure according to claim 1, characterized in that: The tailpipe port and the skirt plate (6) that are threadedly connected to the screw sleeve (7) are both on the same vertical plane as the middle of the deformation groove (8), and the rubber seal (9) that is deformed and filled into the deformation groove (8) is attached to the structural gap between the tailpipe, the screw sleeve (7) and the skirt plate (6).

6. The nitrogen oxygen sensor with an anti-leakage structure according to claim 1, characterized in that: The pin locking mechanism comprises a ring seat (1001), a telescopic hole (1002), and a spring pin (1003); the ring seat (1001) is fixedly connected to the outer wall of the screw sleeve (7) at one end away from the sensor body (3); the ring seat (1001) is provided with telescopic holes (1002) at both upper and lower ends; and the spring pin (1003) is inserted into the telescopic hole (1002).

7. The nitrogen oxygen sensor with an anti-leakage structure according to claim 6, characterized in that: The spring pin (1003) is composed of a pin, a ring sheet fixed on the outer wall of the pin, and a spring fixed on the ring sheet. The ring sheet and the spring elastically displace in the telescopic hole (1002), and the pin is inserted into the corresponding pin hole on the tailpipe.

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