Temperature control device of nitrogen-oxygen sensor and positioning method of temperature control device

Abstract

The invention discloses a temperature control device and method for a nitrogen-oxygen sensor, and relates to the field of nitrogen-oxygen sensors. A temperature control device of a nitrogen-oxygen sensor comprises a mounting base and further comprises the nitrogen-oxygen sensor fixedly connected to the mounting base, and bimetallic strips are fixedly connected to the nitrogen-oxygen sensor and are made of nickel-chromium alloy and iron-nickel alloy respectively; when the temperature rises, the nickel-chromium alloy with the high thermal expansion coefficient expands faster, expansion of one end of the nickel-chromium alloy on the bimetallic strip is restrained by the iron-nickel alloy at the other end, and the nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip bend towards one side of the iron-nickel alloy at the same time. The second sealing cover at the end, penetrating through the heating wire, of the center shaft is pushed to the end away from the heating wire, the first sealing cover is pushed to the end away from the cooling fan, and when the cooling fan works, flowing of hot air in the mounting base is accelerated, and meanwhile the cooling time is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of nitrogen and oxygen sensors, and in particular relates to a temperature control device for nitrogen and oxygen sensors. Background Art

[0002] In high-temperature environments, the electronic components inside the sensor may age faster, degrade in performance, or even be damaged due to overheating, resulting in deviations in the measurement data or sensor failure. In low-temperature environments, the sensor's response speed slows down, the measurement accuracy decreases, and it is impossible to accurately and timely feedback information on nitrogen oxide concentrations. Traditional nitrogen oxide sensors lack an effective automatic temperature adjustment mechanism and often require additional manual intervention or complex and expensive external temperature control equipment to maintain their operating temperature within the appropriate range. This not only increases the complexity and cost of operation, but also makes it difficult to ensure that the sensor can always operate stably and accurately under various complex working conditions. Therefore, it is particularly urgent to develop a temperature control technology that can automatically adjust according to the real-time temperature of the nitrogen oxide sensor to achieve superheat ventilation and cooling and low-temperature heating, and has fast response characteristics. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a temperature control device for a nitrogen oxide sensor that can overcome the above problems or at least partially solve the above problems.

[0004] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a temperature control device for a nitrogen oxide sensor, including a mounting base, and also including: a nitrogen oxide sensor fixedly connected to the mounting base, a bimetallic strip fixedly connected to the nitrogen oxide sensor, and the bimetallic strips are respectively made of nickel-chromium alloy and iron-nickel alloy; when the temperature rises, the nickel-chromium alloy with a higher thermal expansion coefficient expands faster, and the expansion of one end of the nickel-chromium alloy on the bimetallic strip will be constrained by the iron-nickel alloy at the other end, and the nickel-chromium alloy and iron-nickel alloy on the bimetallic strip are simultaneously bent toward one side of the iron-nickel alloy; conversely, when the temperature drops, the nickel-chromium alloy on the bimetallic strip contracts faster, and the nickel-chromium alloy and iron-nickel alloy on the bimetallic strip are bent toward one side of the nickel-chromium alloy; a cooling switch and a heating switch are fixedly connected to the mounting base, and the two ends of the bimetallic strip correspond to the cooling switch and the heating switch respectively; when the temperature rises, the bimetallic strip is close to one end of the cooling switch, and when the temperature drops, the bimetallic strip is close to one end of the heating switch.

[0005] Furthermore, a refrigeration iron core is fixedly connected to the refrigeration switch, a refrigeration electric coil is sleeved on the refrigeration iron core, a connecting frame is fixedly connected to the refrigeration iron core, and an iron frame is fixedly connected to the connecting frame.

[0006] Furthermore, the two groups of iron frames are fixedly connected with fixed blocks, the two groups of iron frames are rotatably connected with limiting blocks, the two groups of iron frames are rotatably connected with stirring wheels, and the limiting blocks correspond to the gears on the stirring wheels.

[0007] Furthermore, a cooling fan is fixedly connected to the stirring wheel.

[0008] Furthermore, a refrigeration box is fixedly connected to the connecting frame, and a stirring wheel is provided inside the refrigeration box.

[0009] Furthermore, a heating iron core is fixedly connected to the heating switch, a heating electric coil is sleeved on the heating iron core, the heating switch is fixedly connected to the shell, and a heating wire is fixedly connected to the shell.

[0010] Furthermore, a heating fan is rotatably connected to the outer shell, a piston cavity is provided on the heating fan, a piston block is slidably connected to the piston cavity, and a starting tooth is fixedly connected to the heating fan.

[0011] Furthermore, the starting tooth is fixedly connected to a central shaft, the central shaft is fixedly connected to a sliding tooth, and the sliding tooth corresponds to the starting tooth.

[0012] Furthermore, a first sealing cover is fixedly connected to the central shaft, and the first sealing cover corresponds to the heat dissipation fan. A second sealing cover is fixedly connected to the central shaft, and the second sealing cover corresponds to the heating fan.

[0013] Furthermore, a temperature control method for a nitrogen oxide sensor includes the following steps:

[0014] S1, overheat ventilation;

[0015] First, the nitrogen oxide sensor is installed on the mounting base. When the nitrogen oxide sensor overheats, the nickel-chromium alloy with a higher thermal expansion coefficient of the bimetallic strip on the nitrogen oxide sensor expands faster. The expansion of one end of the nickel-chromium alloy on the bimetallic strip will be constrained by the iron-nickel alloy on the other end. The nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip are bent toward the side of the iron-nickel alloy at the same time. The protruding block on the bimetallic strip will be stuck in the refrigeration switch, so that the refrigeration switch is powered on. After the refrigeration switch is powered on, a magnetic field is obtained around the refrigeration iron core wrapped by the refrigeration coil, and the connecting frame and the iron frame obtain magnetism at the same time. The fixed block on the iron frame begins to absorb the limiting block. After the limiting block is separated from the gear on the stirring wheel, the stirring wheel starts to rotate when the refrigeration switch is powered on. The stirring wheel starts to stir inside the refrigeration box to accelerate the flow rate of the cold air in the refrigeration box. At the same time, the stirring wheel drives the cooling fan to rotate, blowing the cold air inside the refrigeration box into the bimetallic strip and the nitrogen oxide sensor, thereby achieving the effect of timely refrigeration and protection when the nitrogen oxide sensor overheats.

[0016] S2, cold heating;

[0017] When the temperature drops, the nickel-chromium alloy on the bimetallic strip contracts faster, and the nickel-chromium alloy and iron-nickel alloy on the bimetallic strip bend toward one side of the nickel-chromium alloy. The protruding block on the bimetallic strip will be stuck in the heating switch, so that the heating switch is energized. After the heating switch is energized, the heating wire inside the shell begins to be energized and heated. At this time, the inside of the shell is sealed, and the air inside it expands after being heated, thereby pushing the piston block inside the piston cavity to slide toward one end of the bimetallic strip. At the same time, the central axis on the piston block is moved synchronously, and the central axis drives the sliding teeth to fit on the starting teeth. After the starting teeth and the sliding teeth are engaged with each other, the heating fan starts to rotate, driving the air heated by the heating wire inside the shell to blow onto the bimetallic strip and the nitrogen oxide sensor, heating the bimetallic strip and the nitrogen oxide sensor, thereby achieving the effect of timely heating when the temperature of the nitrogen oxide sensor is too low;

[0018] S3, quick response;

[0019] When the piston block inside the piston cavity slides toward one end of the bimetallic strip, the central shaft drives the first sealing cover to cover and seal the cooling fan, ensuring that the hot air blown into the mounting base by the heating fan does not escape, thereby accelerating the heating time of the bimetallic strip and the nitrogen oxide sensor. After the cooling switch is energized, when the piston block inside the piston cavity moves away from one end of the bimetallic strip, the second sealing cover on one end of the central shaft passing through the heating wire is pushed toward the end away from the heating wire, and the first sealing cover is pushed toward the end away from the cooling fan. When the cooling fan is working, the flow of hot air inside the mounting base is accelerated while the cooling time is accelerated.

[0020] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: the stirring wheel of the present invention starts stirring inside the refrigeration box to accelerate the flow rate of cold air in the refrigeration box, and at the same time, the stirring wheel drives the cooling fan to rotate, blowing the cold air inside the refrigeration box into the bimetallic strip and the nitrogen oxide sensor, thereby achieving the effect of timely cooling and protection when the nitrogen oxide sensor overheats.

[0021] After the starting teeth and the sliding teeth engage with each other, the heating fan starts to rotate, driving the air heated by the heating wire inside the shell to blow toward the bimetallic strip and the nitrogen oxide sensor, heating the bimetallic strip and the nitrogen oxide sensor, thereby achieving the effect of timely heating when the temperature of the nitrogen oxide sensor is too low.

[0022] The second sealing cover on one end through which the central axis passes through the heating wire is pushed toward the end away from the heating wire, and the first sealing cover is pushed toward the end away from the cooling fan. When the cooling fan is working, the flow of hot air inside the mounting base is accelerated while the cooling time is accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the attached figure:

[0024] Figure 1 This is a three-dimensional schematic diagram of a temperature control device for a nitrogen oxide sensor proposed by the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a mounting base of a temperature control device for a nitrogen oxide sensor and a nitrogen oxide sensor proposed in the present invention;

[0026] Figure 3 This is a schematic structural diagram of a cooling switch and a heating switch in a temperature control device for a nitrogen oxide sensor proposed by the present invention;

[0027] Figure 4 This is a schematic structural diagram of a first sealing cover and a second sealing cover in a temperature control device for a nitrogen and oxygen sensor proposed by the present invention;

[0028] Figure 5 A temperature control device for a nitrogen and oxygen sensor proposed by the present invention Figure 4 Schematic diagram of the structure at A in the middle;

[0029] Figure 6 This is a schematic cross-sectional view of a temperature control device for a nitrogen and oxygen sensor proposed by the present invention;

[0030] Figure 7 This is a schematic structural diagram of a temperature control device for a nitrogen and oxygen sensor proposed by the present invention;

[0031] Figure 8 This is a schematic structural diagram of a stirring wheel and a cooling fan in a temperature control device for a nitrogen and oxygen sensor proposed by the present invention;

[0032] Figure 9 This is a schematic structural diagram of a heating fan and a starting gear in a temperature control device for a nitrogen oxide sensor proposed by the present invention;

[0033] Figure 10 A temperature control device for a nitrogen and oxygen sensor proposed by the present invention Figure 9 Schematic diagram of the structure at point B.

[0034] In the figure: 1. Mounting base; 2. Nitrogen oxide sensor; 21. Bimetallic strip; 3. Refrigeration switch; 31. Refrigeration core; 32. Refrigeration coil; 33. Connecting frame; 34. Iron frame; 35. Fixed block; 36. Limiting block; 37. Stirring wheel; 38. Cooling fan; 39. Refrigeration box; 4. Heating switch; 41. Heating core; 42. Heating coil; 43. Housing; 44. Heating wire; 45. Heating fan; 46. Piston chamber; 47. Piston block; 48. Starting tooth; 5. Center shaft; 51. Sliding tooth; 52. First sealing cover; 53. Second sealing cover. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0036] Example 1: Reference Figure 1-10 , a temperature control device for a nitrogen oxide sensor includes a mounting base 1, and also includes: a nitrogen oxide sensor 2 fixedly connected to the mounting base 1, a bimetallic strip 21 fixedly connected to the nitrogen oxide sensor 2, and the bimetallic strip 21 is made of nickel-chromium alloy and iron-nickel alloy respectively; when the temperature rises, the nickel-chromium alloy with a higher thermal expansion coefficient expands faster, and the expansion of one end of the nickel-chromium alloy on the bimetallic strip 21 will be constrained by the iron-nickel alloy at the other end, and the nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip 21 simultaneously bend toward the side of the iron-nickel alloy; conversely, when the temperature drops, the nickel-chromium alloy on the bimetallic strip 21 contracts faster, and the nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip 21 bend toward the side of the nickel-chromium alloy; a cooling switch 3 and a heating switch 4 are fixedly connected to the mounting base 1, and the two ends of the bimetallic strip 21 correspond to the cooling switch 3 and the heating switch 4 respectively; when the temperature rises, the bimetallic strip 21 is close to one end of the cooling switch 3, and when the temperature drops, the bimetallic strip 21 is close to one end of the heating switch 4.

[0037] A refrigeration iron core 31 is fixedly connected to the refrigeration switch 3 , a refrigeration electric coil 32 is sleeved on the refrigeration iron core 31 , a connecting frame 33 is fixedly connected to the refrigeration iron core 31 , and an iron frame 34 is fixedly connected to the connecting frame 33 .

[0038] The two groups of iron frames 34 are fixedly connected with fixing blocks 35 , the two groups of iron frames 34 are rotatably connected with limiting blocks 36 , the two groups of iron frames 34 are rotatably connected with stirring wheels 37 , and the limiting blocks 36 correspond to gears on the stirring wheels 37 .

[0039] A cooling fan 38 is fixedly connected to the stirring wheel 37 .

[0040] A refrigeration box 39 is fixedly connected to the connecting frame 33 , and a stirring wheel 37 is provided inside the refrigeration box 39 .

[0041] A heating core 41 is fixedly connected to the heating switch 4 , a heating coil 42 is sleeved on the heating core 41 , a housing 43 is fixedly connected to the heating switch 4 , and a heating wire 44 is fixedly connected to the housing 43 .

[0042] A heating fan 45 is rotatably connected to the housing 43 . A piston cavity 46 is defined in the heating fan 45 . A piston block 47 is slidably connected to the piston cavity 46 . A starting tooth 48 is fixedly connected to the heating fan 45 .

[0043] The starting tooth 48 is fixedly connected to the central shaft 5 , and the central shaft 5 is fixedly connected to the sliding tooth 51 . The sliding tooth 51 corresponds to the starting tooth 48 .

[0044] A first sealing cover 52 is fixedly connected to the central shaft 5 , and the first sealing cover 52 corresponds to the cooling fan 38 . A second sealing cover 53 is fixedly connected to the central shaft 5 , and the second sealing cover 53 corresponds to the heating fan 45 .

[0045] A temperature control method for a nitrogen oxide sensor comprises the following steps:

[0046] S1, overheat ventilation;

[0047] First, the nitrogen oxide sensor 2 is installed on the mounting base 1. When the nitrogen oxide sensor 2 is overheated, the nickel-chromium alloy with a higher thermal expansion coefficient of the bimetallic strip 21 on the nitrogen oxide sensor 2 expands faster. The expansion of one end of the nickel-chromium alloy on the bimetallic strip 21 will be constrained by the iron-nickel alloy on the other end. The nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip 21 will bend toward the side of the iron-nickel alloy at the same time. The protruding block on the bimetallic strip 21 will be stuck in the refrigeration switch 3, so that the refrigeration switch 3 is powered on. After the refrigeration switch 3 is powered on, the refrigeration iron core 31 wrapped by the refrigeration coil 32 is obtained. Magnetic field, the connecting frame 33 and the iron frame 34 obtain magnetism at the same time, the fixed block 35 on the iron frame 34 begins to absorb the limiting block 36, and after the limiting block 36 is separated from the gear on the stirring wheel 37, the stirring wheel 37 starts to rotate when the refrigeration switch 3 is powered on, and the stirring wheel 37 starts to stir inside the refrigeration box 39 to accelerate the flow rate of the cold air in the refrigeration box 39. At the same time, the stirring wheel 37 drives the cooling fan 38 to rotate, blowing the cold air inside the refrigeration box 39 into the bimetallic strip 21 and the nitrogen oxide sensor 2, thereby achieving the effect of timely cooling and protection when the nitrogen oxide sensor 2 is overheated;

[0048] S2, cold heating;

[0049] When the temperature drops, the nickel-chromium alloy on the bimetallic strip 21 contracts faster, and the nickel-chromium alloy and iron-nickel alloy on the bimetallic strip 21 bend toward one side of the nickel-chromium alloy. The protruding block on the bimetallic strip 21 will be stuck in the heating switch 4, so that the heating switch 4 is energized. After the heating switch 4 is energized, the heating wire 44 inside the shell 43 begins to be energized and heated. At this time, the inside of the shell 43 is in a sealed state. The air inside it expands after being heated, and then pushes the piston block 47 inside the piston chamber 46 to slide toward one end of the bimetallic strip 21. At the same time, the central shaft 5 on the piston block 47 is synchronously moved, and the central shaft 5 drives the sliding teeth 51 to fit on the starting teeth 48. After the starting teeth 48 and the sliding teeth 51 are meshed with each other, the heating fan 45 starts to rotate, driving the air heated by the heating wire 44 inside the shell 43 to blow toward the bimetallic strip 21 and the nitrogen oxide sensor 2, heating the bimetallic strip 21 and the nitrogen oxide sensor 2, thereby achieving the effect of timely heating when the temperature of the nitrogen oxide sensor 2 is too low;

[0050] S3, quick response;

[0051] When the piston block 47 inside the piston chamber 46 slides toward one end of the bimetallic strip 21, the central shaft 5 drives the first sealing cover 52 to cover and seal the cooling fan 38, ensuring that the hot air blown into the mounting base 1 by the heating fan 45 does not escape, thereby accelerating the heating time of the bimetallic strip 21 and the nitrogen oxide sensor 2. After the cooling switch 3 is energized, when the piston block 47 inside the piston chamber 46 moves away from one end of the bimetallic strip 21, the second sealing cover 53 on one end of the central shaft 5 passing through the heating wire 44 is pushed toward the end away from the heating wire 44, and the first sealing cover 52 is pushed toward the end away from the cooling fan 38. When the cooling fan 38 is working, the flow of hot air inside the mounting base 1 is accelerated while the cooling time is accelerated.

[0052] Example 2: Reference Figures 1-10 A temperature control method for a nitrogen oxide sensor comprises the following steps:

[0053] S1, overheat ventilation;

[0054] First, the nitrogen oxide sensor 2 is installed on the mounting base 1. When the nitrogen oxide sensor 2 is overheated, the nickel-chromium alloy with a higher thermal expansion coefficient of the bimetallic strip 21 on the nitrogen oxide sensor 2 expands faster. The expansion of one end of the nickel-chromium alloy on the bimetallic strip 21 will be constrained by the iron-nickel alloy on the other end. The nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip 21 will bend toward the side of the iron-nickel alloy at the same time. The protruding block on the bimetallic strip 21 will be stuck in the refrigeration switch 3, so that the refrigeration switch 3 is powered on. After the refrigeration switch 3 is powered on, the refrigeration iron core 31 wrapped by the refrigeration coil 32 is obtained. Magnetic field, the connecting frame 33 and the iron frame 34 obtain magnetism at the same time, the fixed block 35 on the iron frame 34 begins to absorb the limiting block 36, and after the limiting block 36 disengages from the gear on the stirring wheel 37, the stirring wheel 37 begins to rotate when the refrigeration switch 3 is powered on, and the stirring wheel 37 begins to stir inside the refrigeration box 39 to accelerate the flow rate of the cold air in the refrigeration box 39. At the same time, the stirring wheel 37 drives the cooling fan 38 to rotate, blowing the cold air inside the refrigeration box 39 into the bimetallic strip 21 and the nitrogen oxide sensor 2, thereby achieving the effect of timely cooling and protection when the nitrogen oxide sensor 2 is overheated.

[0055] S2, cold heating;

[0056] As the temperature drops, the nickel-chromium alloy on the bimetallic strip 21 contracts faster, and the nickel-chromium alloy and iron-nickel alloy on the bimetallic strip 21 bend toward the side of the nickel-chromium alloy. The protrusion on the bimetallic strip 21 will be stuck in the heating switch 4, so that the heating switch 4 is energized. After the heating switch 4 is energized, the heating wire 44 inside the housing 43 begins to be energized and heated. At this time, the interior of the housing 43 is in a sealed state. The air inside it expands after being heated, and then pushes the piston block 47 inside the piston chamber 46 to slide toward one end of the bimetallic strip 21. At the same time, the central shaft 5 on the piston block 47 is synchronously moved. The central shaft 5 drives the sliding teeth 51 to fit on the starting teeth 48. After the starting teeth 48 and the sliding teeth 51 engage with each other, the heating fan 45 starts to rotate, driving the air heated by the heating wire 44 inside the housing 43 to blow toward the bimetallic strip 21 and the nitrogen oxide sensor 2, thereby heating the bimetallic strip 21 and the nitrogen oxide sensor 2, thereby achieving the effect of timely heating when the temperature of the nitrogen oxide sensor 2 is too low.

[0057] S3, quick response;

[0058] When the piston block 47 inside the piston chamber 46 slides toward one end of the bimetallic strip 21, the central shaft 5 drives the first sealing cover 52 to cover and seal the cooling fan 38, ensuring that the hot air blown into the mounting base 1 by the heating fan 45 does not escape, thereby accelerating the heating time of the bimetallic strip 21 and the nitrogen oxide sensor 2. After the cooling switch 3 is energized, when the piston block 47 inside the piston chamber 46 moves away from one end of the bimetallic strip 21, the second sealing cover 53 on one end of the central shaft 5 passing through the heating wire 44 is pushed toward the end away from the heating wire 44, and the first sealing cover 52 is pushed toward the end away from the cooling fan 38. When the cooling fan 38 is working, the flow of hot air inside the mounting base 1 is accelerated while the cooling time is accelerated.

[0059] The present invention accelerates the flow rate of cold air in the refrigeration box 39 by stirring the interior of the refrigeration box 39 by the stirring wheel 37. At the same time, the stirring wheel 37 drives the cooling fan 38 to rotate, blowing the cold air inside the refrigeration box 39 into the bimetallic strip 21 and the nitrogen oxide sensor 2, thereby achieving the effect of timely cooling and protection when the nitrogen oxide sensor 2 is overheated.

[0060] After the starting tooth 48 and the sliding tooth 51 engage with each other, the heating fan 45 starts to rotate, driving the air heated by the heating wire 44 inside the shell 43 to blow toward the bimetallic strip 21 and the nitrogen oxide sensor 2, heating the bimetallic strip 21 and the nitrogen oxide sensor 2, thereby achieving the effect of timely heating when the temperature of the nitrogen oxide sensor 2 is too low.

[0061] The second sealing cover 53 on one end of the central axis 5 passing through the heating wire 44 is pushed toward the end away from the heating wire 44, and the first sealing cover 52 is pushed toward the end away from the cooling fan 38. When the cooling fan 38 is working, the flow of hot air inside the mounting base 1 is accelerated while accelerating the cooling time.

[0062] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A temperature control device for a nitrogen and oxygen sensor, comprising a mounting seat (1), characterized in that: Also includes: A nitrogen oxide sensor (2) is fixedly connected to the mounting base (1), wherein a bimetallic strip (21) is fixedly connected to the nitrogen oxide sensor (2), and the bimetallic strip (21) is made of a nickel-chromium alloy and an iron-nickel alloy respectively; When the temperature rises, the nickel-chromium alloy with a higher thermal expansion coefficient expands faster, and the expansion of one end of the nickel-chromium alloy on the bimetallic strip (21) is constrained by the iron-nickel alloy on the other end, so that the nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip (21) simultaneously bend toward one side of the iron-nickel alloy; conversely, when the temperature drops, the nickel-chromium alloy on the bimetallic strip (21) contracts faster, and the nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip (21) bend toward one side of the nickel-chromium alloy; The mounting base (1) is fixedly connected to a cooling switch (3) and a heating switch (4), and two ends of the bimetallic strip (21) correspond to the cooling switch (3) and the heating switch (4) respectively; When the temperature rises, the bimetallic strip (21) is close to one end of the cooling switch (3), and when the temperature drops, the bimetallic strip (21) is close to one end of the heating switch (4).

2. The temperature control device of a nitrogen oxide sensor according to claim 1, characterized in that: A refrigeration iron core (31) is fixedly connected to the refrigeration switch (3), a refrigeration electric coil (32) is sleeved on the refrigeration iron core (31), a connecting frame (33) is fixedly connected to the refrigeration iron core (31), and an iron frame (34) is fixedly connected to the connecting frame (33).

3. The temperature control device of a nitrogen oxide sensor according to claim 2, characterized in that: The two groups of iron frames (34) are fixedly connected with fixed blocks (35), the two groups of iron frames (34) are rotatably connected with limiting blocks (36), the two groups of iron frames (34) are rotatably connected with stirring wheels (37), and the limiting blocks (36) correspond to the gears on the stirring wheels (37).

4. The temperature control device of a nitrogen oxide sensor according to claim 3, characterized in that: A cooling fan (38) is fixedly connected to the stirring wheel (37).

5. The temperature control device of a nitrogen oxide sensor according to claim 2, characterized in that: A refrigeration box (39) is fixedly connected to the connecting frame (33), and a stirring wheel (37) is provided inside the refrigeration box (39).

6. The temperature control device of a nitrogen oxide sensor according to claim 1, characterized in that: The heating switch (4) is fixedly connected to a heating iron core (41), a heating coil (42) is sleeved on the heating iron core (41), the heating switch (4) is fixedly connected to a housing (43), and a heating wire (44) is fixedly connected to the housing (43).

7. The temperature control device of a nitrogen oxide sensor according to claim 6, characterized in that: A heating fan (45) is rotatably connected to the housing (43), a piston chamber (46) is provided on the heating fan (45), a piston block (47) is slidably connected to the piston chamber (46), and a starting tooth (48) is fixedly connected to the heating fan (45).

8. The temperature control device of a nitrogen oxide sensor according to claim 7, characterized in that: The starting tooth (48) is fixedly connected to a central shaft (5), and the central shaft (5) is fixedly connected to a sliding tooth (51), and the sliding tooth (51) corresponds to the starting tooth (48).

9. A temperature control device and positioning method for a nitrogen oxide sensor according to claim 8, characterized in that: A first sealing cover (52) is fixedly connected to the central shaft (5), and the first sealing cover (52) corresponds to the cooling fan (38). A second sealing cover (53) is fixedly connected to the central shaft (5), and the second sealing cover (53) corresponds to the heating fan (45).

10. A method for using a temperature control method for a nitrogen oxide sensor, characterized in that: A temperature control device for a nitrogen oxide sensor according to any one of claims 1 to 9 is used, comprising the following steps: S1, overheat ventilation; First, the nitrogen oxide sensor (2) is mounted on the mounting base (1). When the nitrogen oxide sensor (2) is overheated, the nickel-chromium alloy with a higher thermal expansion coefficient of the bimetallic strip (21) on the nitrogen oxide sensor (2) expands faster. The expansion of one end of the nickel-chromium alloy on the bimetallic strip (21) is constrained by the iron-nickel alloy on the other end. The nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip (21) are bent toward one side of the iron-nickel alloy at the same time. The protruding block on the bimetallic strip (21) is stuck in the refrigeration switch (3), so that the refrigeration switch (3) is powered on. After the refrigeration switch (3) is powered on, a magnetic field is obtained around the refrigeration iron core (31) wrapped by the refrigeration coil (32). The connecting frame (33) and the iron frame (34) simultaneously obtain magnetism, and the fixed block (35) on the iron frame (34) begins to absorb the limiting block (36). After the limiting block 36 is separated from the gear on the stirring wheel (37), the stirring wheel (37) begins to rotate when the refrigeration switch (3) is powered on. The stirring wheel (37) begins to stir inside the refrigeration box (39) to accelerate the cold air flow rate of the refrigeration box (39). At the same time, the stirring wheel (37) drives the cooling fan (38) to rotate, and the cold air inside the refrigeration box (39) is blown into the bimetallic strip (21) and the nitrogen oxide sensor (2), thereby achieving the effect of timely refrigeration and protection when the nitrogen oxide sensor (2) is overheated; S2, cold heating; When the temperature drops, the nickel-chromium alloy on the bimetallic strip (21) contracts faster, and the nickel-chromium alloy and the iron-nickel alloy on the bimetallic strip (21) bend toward the side of the nickel-chromium alloy. The protruding block on the bimetallic strip (21) will be stuck in the heating switch (4), so that the heating switch (4) is powered on. After the heating switch (4) is powered on, the heating wire (44) inside the shell (43) starts to be powered on and heated. At this time, the inside of the shell (43) is in a sealed state. The air inside it expands after being heated, and then pushes the piston block (47) inside the piston chamber (46) toward the bimetallic strip. One end of the piston (21) slides, and at the same time, the central shaft (5) on the piston block (47) is synchronously moved. The central shaft (5) drives the sliding tooth (51) to fit on the starting tooth (48). After the starting tooth (48) and the sliding tooth (51) are meshed with each other, the heating fan (45) is driven to start rotating, driving the air heated by the heating wire (44) inside the shell (43) to blow toward the bimetallic strip (21) and the nitrogen oxide sensor (2), heating the bimetallic strip (21) and the nitrogen oxide sensor (2), thereby achieving the effect of timely heating when the temperature of the nitrogen oxide sensor (2) is too low; S3, quick response; When the piston block (47) inside the piston chamber (46) slides toward one end of the bimetallic strip (21), the central shaft (5) drives the first sealing cover (52) to cover and seal the cooling fan (38), ensuring that the hot air blown into the mounting seat (1) by the heating fan (45) does not escape, thereby accelerating the heating time of the bimetallic strip (21) and the nitrogen oxide sensor (2). After the cooling switch (3) is energized, when the piston block (47) inside the piston chamber (46) moves away from one end of the bimetallic strip (21), the second sealing cover (53) on one end of the central shaft (5) passing through the heating wire (44) is pushed toward the end away from the heating wire (44), and the first sealing cover (52) is pushed toward the end away from the cooling fan (38). When the cooling fan (38) is working, the flow of hot air inside the mounting seat (1) is accelerated while the cooling time is accelerated.

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