Protective structure of tail gas temperature sensor

Abstract

The utility model discloses a tail gas temperature sensor protection structure which comprises a metal cylinder, a thermistor is fixed in the metal cylinder, one end of the metal cylinder is provided with a plugging head, one end of the plugging head is integrally provided with a plugging cylinder, the plugging cylinder is plugged in the metal cylinder, and the outer wall of the plugging cylinder is provided with a circular ring groove. A limiting ring matched with the circular ring groove is arranged on the inner wall of the metal cylinder, a conical cavity is formed in the plugging head, and the thermistor is located in the conical cavity. The plugging cylinder of the plugging head is plugged with the metal cylinder, and then the outer wall of the metal cylinder is extruded, so that a limiting ring matched with the circular ring groove is formed on the inner wall of the metal cylinder, the effect of fixing the plugging head and the metal cylinder is further achieved, the difficulty of the whole plugging operation is reduced, polishing is not needed, and the plugging efficiency is improved. And the production efficiency of the tail gas temperature sensor is improved.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas temperature sensor technology, and specifically to a protective structure for an exhaust gas temperature sensor. Background Technology

[0002] Exhaust gas temperature sensors are used to monitor the temperature of the exhaust pipe in order to control the combustion state of the engine. Typically, the exhaust gas temperature sensor is located on the exhaust pipe of a car, close to the engine.

[0003] The exhaust gas temperature sensor has a metal shell, inside which is a thermistor. To provide enclosed protection for the thermistor, a sealing head is typically welded to the metal shell. However, due to the small size of the shell, welding is difficult and requires subsequent grinding, thus reducing the processing efficiency of the exhaust gas temperature sensor. Therefore, there is an urgent need to design a protective structure for the exhaust gas temperature sensor to solve these problems. Utility Model Content

[0004] The purpose of this invention is to provide a protective structure for an exhaust gas temperature sensor to address the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A protective structure for an exhaust gas temperature sensor includes a metal cylinder, inside which a thermistor is fixed. One end of the metal cylinder is provided with a sealing head, and one end of the sealing head is integrally formed with a plug-in cylinder, which is inserted into the inside of the metal cylinder. The outer wall of the plug-in cylinder is provided with an annular groove, and the inner wall of the metal cylinder is provided with a limiting ring adapted to the annular groove. The sealing head is provided with a conical cavity, and the thermistor is located inside the conical cavity.

[0007] Furthermore, one end of the plug-in cylinder is provided with a tapered end, and the interior of the metal cylinder is filled with a sealing body.

[0008] Furthermore, a metal bend is fixed to one end of the metal cylinder, a threaded sleeve is fitted onto the outside of the metal bend, a nut is fixed to one end of the threaded sleeve, and a retaining ring is fixed at the junction of the metal cylinder and the metal bend.

[0009] Furthermore, a data cable is installed inside the metal bend, one end of the data cable is electrically connected to a connector, the other end of the data cable is electrically connected to a thermistor, and a sealing cylinder is installed at the end of the metal bend.

[0010] Furthermore, the data cable includes an outer protective layer, and the inner part of the outer protective layer is provided with a braided layer.

[0011] Furthermore, an inner protective layer is provided inside the braided layer, and a wire is provided inside the inner protective layer.

[0012] In the above technical solution, the exhaust gas temperature sensor protection structure provided by this utility model has the following advantages: the plug-in tube of the sealing head is plugged into the metal tube, and then the outer wall of the metal tube is squeezed to form a limiting ring that matches the annular groove on the inner wall of the metal tube, thereby achieving the effect of fixing the sealing head and the metal tube. This reduces the difficulty of the entire sealing operation and eliminates the need for grinding, thus improving the efficiency of the exhaust gas temperature sensor production. Through the setting of the outer protective layer, braided layer and inner protective layer, the data cable is not easily damaged during use, and the braided layer is formed by metal fiber braiding, which has tensile and bending resistance, thus extending the service life of the data cable. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 This is a front view structural schematic diagram of an embodiment of the exhaust gas temperature sensor protection structure of this utility model.

[0015] Figure 2 This is an enlarged structural diagram of point A provided for an embodiment of the exhaust gas temperature sensor protection structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the data cable provided in an embodiment of the exhaust gas temperature sensor protection structure of this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Metal cylinder, 2. Thermistor, 3. Sealing head, 4. Connector, 5. Data cable, 6. Metal bend, 7. Sealing cylinder, 8. Retaining ring, 9. Screw sleeve, 10. Nut, 11. Plug-in cylinder, 12. Circular groove, 13. Limiting ring, 14. Conical end, 15. Sealing body, 16. Conical cavity, 17. Outer protective layer, 18. Braided layer, 19. Inner protective layer, 20. Wire. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0020] like Figure 1-3As shown in the figure, the exhaust gas temperature sensor protection structure provided by this utility model includes a metal cylinder 1, a thermistor 2 fixed inside the metal cylinder 1, a sealing head 3 at one end of the metal cylinder 1, a plug-in tube 11 integrally formed at one end of the sealing head 3, the plug-in tube 11 being inserted into the inside of the metal cylinder 1, a circular groove 12 being provided on the outer wall of the plug-in tube 11, a limiting ring 13 adapted to the circular groove 12 being provided on the inner wall of the metal cylinder 1, a conical cavity 16 being provided inside the sealing head 3, and the thermistor 2 being located inside the conical cavity 16.

[0021] Specifically, in this embodiment, a metal cylinder 1 is included, which serves as the outer shell of the exhaust gas temperature sensor. A thermistor 2 is fixed inside the metal cylinder 1. The thermistor 2 changes its resistance when the temperature changes, causing a change in current, thus generating a current signal based on the temperature change of the exhaust pipe, thereby enabling the detection of the exhaust pipe temperature. A sealing head 3 is provided at one end of the metal cylinder 1. Both the sealing head 3 and the metal cylinder 1 are made of stainless steel. The sealing head 3 seals the end of the metal cylinder 1, and an insert tube 11 is integrally formed at one end of the sealing head 3. The plug-in tube 11 is inserted into the inside of the metal tube 1. The outer wall of the plug-in tube 11 is provided with an annular groove 12. The inner wall of the metal tube 1 is provided with a limiting ring 13 that matches the annular groove 12. The limiting ring 13 is formed by squeezing the outer wall of the metal tube 1, so that the sealing head 3 is fixed to the metal tube 1. The sealing head 3 is provided with a conical cavity 16. The thermistor 2 is located inside the conical cavity 16. The inner wall of the conical cavity 16 is in contact with the thermistor 2, so as to prevent the thermistor 2 from shaking inside the thermistor 2, and at the same time, it can also achieve the effect of thermistor 2 sensing temperature sensitively.

[0022] This utility model provides a protective structure for an exhaust gas temperature sensor. The plug-in cylinder 11 of the sealing head 3 is plugged into the metal cylinder 1, and then the outer wall of the metal cylinder 1 is squeezed to form a limiting ring 13 that matches the annular groove 12 on the inner wall of the metal cylinder 1. This achieves the effect of fixing the sealing head 3 to the metal cylinder 1, reducing the difficulty of the entire sealing operation and eliminating the need for grinding, thereby improving the efficiency of the exhaust gas temperature sensor in production.

[0023] In another embodiment of this utility model, one end of the plug-in tube 11 is provided with a tapered end 14, and the inside of the metal tube 1 is filled with a sealing body 15, which is epoxy resin, so that the sealing body 15 can fix the thermistor 2; one end of the metal tube 1 is fixed with a metal bend 6, and a threaded sleeve 9 is sleeved on the outside of the metal bend 6. One end of the threaded sleeve 9 is fixed with a nut 10. By rotating the nut 10 with a wrench, the nut 10 drives the threaded sleeve 9 to rotate. A retaining ring 8 is fixed at the junction of the metal tube 1 and the metal bend 6. The outer diameter of the retaining ring 8 is smaller than the outer diameter of the threaded sleeve 9 and larger than the inner diameter of the threaded sleeve 9, so that the retaining ring 8 can block the threaded sleeve 9, thereby allowing the threaded sleeve 9 to be threadedly connected to the exhaust pipe of the car, achieving the effect of convenient installation of the exhaust gas temperature sensor; a data cable 5 is provided inside the metal bend 6, and one end of the data cable 5 is electrically connected to a connector 4, and the other end of the data cable 5... The data cable 5 is electrically connected to the thermistor 2. The circuit connection principle between the data cable 5, the connector 4, and the thermistor 2 is based on existing technology. A sealing cylinder 7 is provided at the end of the metal bend 6 to seal the data cable 5 and the metal bend 6, preventing water from entering the metal bend 6. The data cable 5 includes an outer protective layer 17, inside which is a braided layer 18. Inside the braided layer 18 is an inner protective layer 19, inside which are conductors 19. Both the outer protective layer 17 and the inner protective layer 19 are made of PVC, which has waterproof, acid and alkali resistant, and flame retardant properties. The braided layer 18 is formed by stainless steel fiber braiding. Through the outer protective layer 17, the braided layer 18, and the inner protective layer 19, the data cable 5 is not easily damaged during use. Furthermore, the braided layer 18 is formed by metal fiber braiding, which has tensile and bending resistance, thus extending the service life of the data cable 5.

[0024] Working principle: The plug tube 11 of the sealing head 3 is plugged into the metal cylinder 1, and then the outer wall of the metal cylinder 1 is squeezed to form a limiting ring 13 that matches the annular groove 12 on the inner wall of the metal cylinder 1, thereby achieving the effect of fixing the sealing head 3 to the metal cylinder 1. This reduces the difficulty of the entire sealing operation and eliminates the need for grinding, thus improving the efficiency of the exhaust gas temperature sensor during production. The outer protective layer 17, braided layer 18, and inner protective layer 19 make the data cable 5 less susceptible to damage during use. The braided layer 18 is formed by metal fiber braiding, which has tensile and bending resistance, thus extending the service life of the data cable 5.

[0025] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An exhaust gas temperature sensor guard structure characterized by, The application relates to a metal cylinder (1) with a thermistor (2) fixed in the interior of the metal cylinder (1), a blocking head (3) arranged at one end of the metal cylinder (1), a plug-in cylinder (11) integrally formed at one end of the blocking head (3) and inserted into the interior of the metal cylinder (1), a circular groove (12) arranged on the outer wall of the plug-in cylinder (11), a limiting ring (13) arranged on the inner wall of the metal cylinder (1) and matched with the circular groove (12), a conical cavity (16) arranged in the interior of the blocking head (3) and the thermistor (2) arranged in the interior of the conical cavity (16).

2. The exhaust gas temperature sensor protection structure according to claim 1, characterized by, One end of the plug-in cylinder (11) is provided with a conical end (14), and the interior of the metal cylinder (1) is filled with a sealing body (15).

3. The exhaust gas temperature sensor guard structure of claim 1, wherein One end of the metal cylinder (1) is fixed with a metal elbow (6), the outer portion of the metal elbow (6) is sleeved with a screw sleeve (9), one end of the screw sleeve (9) is fixed with a nut (10), and the joint of the metal cylinder (1) and the metal elbow (6) is fixed with a blocking ring (8).

4. The exhaust gas temperature sensor guard structure of claim 3, wherein The interior of the metal elbow (6) is provided with a data line (5), one end of the data line (5) is electrically connected with a connector (4), the other end of the data line (5) is electrically connected with the thermistor (2), and the end portion of the metal elbow (6) is provided with a sealing cylinder (7).

5. The exhaust gas temperature sensor guard structure of claim 4, wherein The data line (5) comprises an outer protective layer (17), the interior of the outer protective layer (17) is provided with a braided layer (18).

6. The exhaust gas temperature sensor guard structure of claim 5, wherein The interior of the braided layer (18) is provided with an inner protective layer (19), and the interior of the inner protective layer (19) is provided with a wire (20).

Images