Fuel automobile exhaust emission detection device

Abstract

The invention discloses a fuel automobile exhaust emission detection device, and relates to the technical field of new energy automobiles, the fuel automobile exhaust emission detection device comprises a detection box and a pretreatment mechanism; an isolation plate is fixedly connected to the inner wall of the detection box in a sealing manner and divides the interior of the detection box into a detection chamber and a pretreatment chamber; the pretreatment mechanism comprises a separation cylinder fixedly connected to the inner wall of the pretreatment chamber, a plurality of semiconductor chilling plates are fixedly embedded in the inner wall of the separation cylinder, the side wall of the isolation plate is fixedly connected with a filter cylinder, the inner wall of the filter cylinder is rotatably connected with a rotating shaft, the side wall of the rotating shaft is fixedly connected with a filter element, and the side wall of the filter element is fixedly connected with a catalytic oxidation layer. The pretreatment mechanism efficiently removes solid particles, liquid water and most gaseous pollutants in the tail gas, the gas finally entering the detection chamber is clean and dry, interference of moisture and impurities on the hydrogen concentration sensor is reduced, and high precision and high reliability of monitoring data are ensured.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a fuel vehicle exhaust emission detection device. Background Technology

[0002] Fuel cell vehicles have become an important direction for the development of new energy vehicles due to their advantages such as zero emissions and high efficiency. Accurate monitoring of their exhaust emissions, especially the concentration of unreacted hydrogen, is the key to evaluating the working efficiency, safety and environmental protection of fuel cell systems.

[0003] Existing fuel cell vehicle exhaust gases are characterized by high temperature and high humidity, and may contain solid particulate matter from the air and system wear, as well as trace amounts of gaseous pollutants. When using precision instruments such as hydrogen concentration sensors for direct detection, moisture condensation can cause the sensor to short-circuit and drift, and solid impurities can contaminate and wear down the sensor's sensitive elements, seriously affecting the monitoring accuracy and sensor lifespan. Based on this, we propose a fuel cell vehicle exhaust emission detection device. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention adopts the following technical solution:

[0005] The exhaust emission testing device for fuel cell vehicles includes a testing chamber and a pretreatment mechanism;

[0006] The inner wall of the testing chamber is sealed and fixedly connected with an isolation plate, which divides the interior of the testing chamber into two parts: a testing chamber and a pretreatment chamber.

[0007] The pretreatment mechanism includes a separation cylinder fixedly connected to the inner wall of the pretreatment chamber. Multiple semiconductor cooling chips are fixedly embedded in the inner wall of the separation cylinder. A filter cylinder is fixedly connected to the side wall of the isolation plate. A rotating shaft is rotatably connected to the inner wall of the filter cylinder. A filter element is fixedly connected to the side wall of the rotating shaft. A catalytic oxidation layer is fixedly connected to the side wall of the filter element. An annular outer shell is fixedly connected to the inner wall of the filter cylinder. The side wall of the filter element and the inner wall of the annular outer shell are slidably and sealingly connected. A sampling component for collecting exhaust gas from fuel vehicles is installed inside the detection box.

[0008] Preferably, the sampling assembly includes an air pump fixedly connected to the inner wall of the detection chamber, an air inlet end of the air pump fixedly connected to an air extraction pipe, the other end of the air extraction pipe penetrating the side wall of the detection chamber, an air outlet end of the air pump fixedly connected to a pumping pipe, the other end of the pumping pipe communicating with a separation cylinder, an air inlet pipe fixedly connected to the upper end of the separation cylinder, the other end of the air inlet pipe communicating with a filter cylinder, and the filter cylinder communicating with the detection chamber through an air inlet pipe.

[0009] Preferably, a rotating mechanism is installed on the filter cartridge. The rotating mechanism includes a motor fixedly connected to the upper end of the filter cartridge. The output end of the motor passes through the top of the filter cartridge and is fixedly connected to a bevel gear one. A bevel gear two is fixedly connected to one end of the rotating shaft. The bevel gear one and the bevel gear two are meshed together.

[0010] Preferably, a preheating mechanism is installed on the filter cartridge. The preheating mechanism includes an annular cylinder fixedly connected to the side wall of the filter cartridge. A heat-conducting fin is fixedly connected to the inner wall of the annular cylinder. One end of the heat-conducting fin is attached to the annular outer shell. The annular outer shell is made of a material with good thermal conductivity. An annular heat exchange cylinder is fixedly connected to the side wall of the separation cartridge. The heat-dissipating end of the semiconductor refrigeration chip extends into the annular heat exchange cylinder. A heat exhaust pipe is fixedly connected to the upper end of the annular heat exchange cylinder. A heat inlet pipe is fixedly connected to the side wall of the annular cylinder. The heat exhaust pipe is connected to the heat inlet pipe through a connecting pipe. A discharge pipe is fixedly connected to the side wall of the annular cylinder. The other end of the discharge pipe extends to the outside of the detection chamber.

[0011] Preferably, the preheating mechanism further includes a pump cylinder fixedly connected to the top of the test chamber. A sliding plug is slidably connected to the inner wall of the pump cylinder. A one-way air inlet pipe is fixedly connected to the inner wall of the pump cylinder. The other end of the one-way air inlet pipe extends to the outside of the test chamber. The pump cylinder is connected to the annular heat exchange cylinder through a one-way air outlet pipe. A T-shaped rod is fixedly connected to the lower end of the sliding plug. The lower end of the T-shaped rod passes through the lower end of the pump cylinder. A spring is sleeved on the side wall of the T-shaped rod. The two ends of the spring are fixedly connected to the lower end of the sliding plug and the bottom of the pump cylinder, respectively. One end of the rotating shaft passes through the side wall of the filter cylinder and is fixedly connected to a cam. The cam slides against the lower end of the T-shaped rod.

[0012] Preferably, the heat-conducting fin has multiple flow guide holes on its sidewall, and all of the multiple flow guide holes penetrate the heat-conducting fin.

[0013] Preferably, a regeneration mechanism is installed inside the detection box. The regeneration mechanism includes a differential pressure sensor fixedly connected to the top of the detection box. Two pressure taps are opened at the upper end of the filter cartridge. The two pressure taps are respectively connected to the differential pressure sensor through two connecting pipes. Multiple electric heating wires are fixedly embedded in the catalytic oxidation layer. The multiple electric heating wires are all connected to the differential pressure sensor through a PLC control circuit.

[0014] Preferably, the detection box is equipped with a cleaning mechanism, which includes a gas storage box fixedly connected to the upper end of the detection box and filled with nitrogen. An inlet pipe is fixedly connected to the side wall of the extraction pipe, and the other end of the inlet pipe is connected to the gas storage box. A gas storage groove is opened on the inner wall of the filter cylinder. A flushing pipe is fixedly connected to the side wall of the pump pipe, and the other end of the flushing pipe is connected to the gas storage groove. A waste discharge pipe is fixedly connected to the inner wall of the filter cylinder, and the other end of the waste discharge pipe extends to the outside of the detection box. Solenoid valves are installed on the inner walls of the extraction pipe, pump pipe, inlet pipe, inlet pipe, flushing pipe, and waste discharge pipe. The solenoid valves are connected to the differential pressure sensor through a PLC control circuit.

[0015] Preferably, a magnetic rotating rod is rotatably connected to the inner wall of the filter cylinder, and multiple fan-shaped baffles are fixedly connected to the side wall of the magnetic rotating rod. The side wall of each fan-shaped baffle is tightly fitted to the inner wall of the filter cylinder. A bevel gear three is rotatably connected to the side wall of the magnetic rotating rod, and the bevel gear three meshes with the bevel gear one. An annular electromagnet is fixedly connected to the side wall of the bevel gear three, and the annular electromagnet is connected to a differential pressure sensor through a PLC control circuit.

[0016] Preferably, a hydrogen concentration sensor is fixedly connected to the inner wall of the detection chamber, and an exhaust port is provided in the inner wall of the detection chamber.

[0017] The present invention has the following beneficial effects:

[0018] 1. By setting up a pretreatment mechanism, solid particles, liquid water and most gaseous pollutants in the exhaust gas are efficiently removed, and the gas that finally enters the detection chamber is clean and dry, which reduces the interference of moisture and impurities on the hydrogen concentration sensor and ensures high accuracy and high reliability of monitoring data.

[0019] 2. The differential pressure sensor is used to monitor the filter element clogging status in real time, and a two-stage triggering mechanism of physical clogging and chemical adsorption saturation is set up. The system can intelligently judge and automatically trigger efficient nitrogen pulse backflushing or safe inert atmosphere program heating regeneration, realizing the whole process from physical cleaning to chemical regeneration and self-maintenance on demand. This not only extends the service life of the filter element and catalytic oxidation layer, but also reduces the frequency and cost of manual maintenance.

[0020] 3. By utilizing the waste heat from the heat-dissipating end of the semiconductor cooling chip and through gas path design, the catalytic oxidation coating is preheated, ensuring it is at its optimal operating temperature during vehicle cold starts. This shortens system response time, improves initial monitoring accuracy, and also lays the thermal foundation for subsequent high-temperature electric heating regeneration. This significantly reduces the electrical energy and time required to heat the catalytic oxidation layer from room temperature to regeneration temperature, achieving tiered utilization of vehicle waste heat and optimization of system energy consumption. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the fuel vehicle exhaust emission detection device proposed in this invention;

[0022] Figure 2 for Figure 1 A cross-sectional view of the detection box.

[0023] Figure 3 for Figure 2 Cross-sectional view of the middle structure;

[0024] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the diagram;

[0025] Figure 5 for Figure 3 Enlarged schematic diagram of the structure at point B in the diagram;

[0026] Figure 6 for Figure 3 Enlarged schematic diagram of the structure at point C;

[0027] Figure 7 for Figure 3 Enlarged schematic diagram of the structure at point D;

[0028] Figure 8 for Figure 5 A cross-sectional view of the central magnetic rotating rod and bevel gear three.

[0029] In the diagram: 1. Detection box; 2. Isolation plate; 201. Detection chamber; 202. Pretreatment chamber; 3. Separation cylinder; 4. Filter cylinder; 5. Rotating shaft; 6. Filter element; 601. Catalytic oxidation layer; 7. Annular shell; 8. Semiconductor cooling chip; 9. Air pump; 10. Extraction pipe; 11. Pump pipe; 12. Inlet pipe; 13. Gas inlet pipe; 14. Motor; 15. Bevel gear one; 16. Bevel gear two; 17. Hydrogen concentration sensor; 18. Exhaust port; 19. Annular cylinder; 20. Thermal conductive fins; 21. Discharge pipe; 22. Connecting pipe; 23. 24. Pump cylinder; 25. Sliding plug; 26. One-way air inlet pipe; 27. One-way air outlet pipe; 28. Differential pressure sensor; 29. ​​Pressure tap; 30. Connecting pipe; 31. Electric heating wire; 32. Air storage tank; 33. Inlet pipe; 34. Air storage tank; 35. Flushing pipe; 36. Waste discharge pipe; 37. Solenoid valve; 38. Magnetic rotating rod; 39. Fan-shaped baffle; 40. Bevel gear three; 41. Ring electromagnet; 42. T-shaped rod; 43. Spring; 44. Cam; 45. Ring heat exchange cylinder; 46. Heat exhaust pipe; 47. Flow guide hole; 48. Heat inlet pipe. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Example 1

[0032] Reference Figures 1-4 The fuel vehicle exhaust emission testing device includes a testing box 1 and a pretreatment mechanism;

[0033] The inner wall of the detection chamber 1 is sealed and fixedly connected to an isolation plate 2, which divides the interior of the detection chamber 1 into two parts: a detection chamber 201 and a pretreatment chamber 202. A hydrogen concentration sensor 17 is fixedly connected to the inner wall of the detection chamber 201, and an exhaust port 18 is opened on the inner wall of the detection chamber 201.

[0034] The pretreatment mechanism includes a separation cylinder 3 fixedly connected to the inner wall of the pretreatment chamber 202. Multiple semiconductor cooling chips 8 are fixedly embedded in the inner wall of the separation cylinder 3. A filter cylinder 4 is fixedly connected to the side wall of the isolation plate 2. A rotating shaft 5 is rotatably connected to the inner wall of the filter cylinder 4. A filter element 6 is fixedly connected to the side wall of the rotating shaft 5. A catalytic oxidation layer 601 is fixedly connected to the side wall of the filter element 6. The catalytic oxidation layer 601 is made of a mixture of nano-level Pt-Pd / AlO3 catalyst and high-temperature binder. It is loaded onto the side wall of the filter element 6 by impregnation and lifting or spraying. An annular shell 7 is fixedly connected to the inner wall of the filter cylinder 4. The side wall of the filter element 6 and the inner wall of the annular shell 7 are sealed and slidably connected. A sampling component for collecting fuel vehicle exhaust gas is installed in the detection box 1.

[0035] The sampling assembly includes an air pump 9 fixedly connected to the inner wall of the detection chamber 1. An air extraction pipe 10 is fixedly connected to the air inlet end of the air pump 9. The other end of the air extraction pipe 10 passes through the side wall of the detection chamber 1. An air pump pipe 11 is fixedly connected to the air outlet end of the air pump 9. The other end of the air pump pipe 11 is connected to the separation cylinder 3. An air inlet pipe 12 is fixedly connected to the upper end of the separation cylinder 3. The other end of the air inlet pipe 12 is connected to the filter cylinder 4. The filter cylinder 4 is connected to the detection chamber 201 through an air inlet pipe 13.

[0036] Furthermore, the detection box 1 is bolted to the fuel vehicle body, with the inlet of the extraction pipe 10 positioned at the fuel vehicle's exhaust pipe. Then, the air pump 9 is activated, drawing in the exhaust gas from the fuel vehicle's exhaust pipe via the extraction pipe 10. The exhaust gas is then pumped into the separator 3 via the pumping pipe 11. The exhaust gas enters the separator 3 tangentially, creating a swirling flow on the inner wall of the separator 3. Solid impurities in the exhaust gas swirl downwards along the inner wall of the separator 3 under centrifugal force. The semiconductor cooling chip 8 cools the exhaust gas, causing water vapor in the exhaust gas to condense into droplets that adhere to the cooling end surface of the semiconductor cooling chip 8. As the solid impurities swirl downwards, the condensed droplets also swirl downwards along with them, finally exiting through the outlet at the lower end of the separator 3. This process removes solid impurities and some moisture from the exhaust gas. Some fine impurities and some water vapor will flow upward at the center of the separator 3, and then enter the filter 4 through the air inlet pipe 12. Then the exhaust gas will pass through the catalytic oxidation layer 601 and the filter element 6 in sequence, and finally enter the detection chamber 201 through the air inlet pipe 13. The catalytic oxidation layer 601 will oxidize CO and VOCs in the exhaust gas into CO2 and H2O, and oxidize and fix some chemical toxins (such as H2S). The filter element 6 can filter water vapor and fine impurities in the exhaust gas. Thus, the exhaust gas entering the detection chamber 201 is clean and non-toxic, and the water content and impurity content are extremely low. This greatly reduces the impact of water and solid impurities on the monitoring accuracy of the hydrogen concentration sensor 17. At this time, the hydrogen concentration sensor 17 monitors the hydrogen content, so the working efficiency of the fuel cell can be analyzed based on the hydrogen concentration, and the detection results are more accurate.

[0037] Example 2

[0038] Reference Figure 5 As shown, a rotating mechanism is installed on the filter cylinder 4. The rotating mechanism includes a motor 14 fixedly connected to the upper end of the filter cylinder 4. The output end of the motor 14 passes through the top of the filter cylinder 4 and is fixedly connected to a bevel gear 15. One end of the rotating shaft 5 is fixedly connected to a bevel gear 16. The bevel gear 15 and the bevel gear 16 are meshed together.

[0039] Furthermore, by starting the motor 14, the first bevel gear 15 is driven to rotate, which in turn drives the second bevel gear 16 to rotate, thereby driving the filter element 6 and the catalytic oxidation layer 601 to rotate. This allows the surfaces of the filter element 6 and the catalytic oxidation layer 601 to be evenly aligned with the exhaust gas flow emitted from the intake pipe 12, maximizing the utilization of the entire filtration area of ​​the filter element 6, delaying local blockage, and the rotation causes the catalytic oxidation layer 601 on the surface of the filter element 6 to continuously generate new contact interfaces with the exhaust gas, which is equivalent to dynamically stirring and mixing the exhaust gas. This ensures that pollutants and catalytic active sites are in more sufficient and uniform contact, improving the overall conversion efficiency, and providing a more stable and representative purified gas sample for the downstream hydrogen concentration sensor 17.

[0040] It is worth mentioning that the slight centrifugal force generated by the rotation of filter element 6 helps to shake off the tiny droplets attached to the filter pore inlet. At the same time, the dynamic surface makes it more difficult for the water film to form stably, ensuring the permeability of filter element 6 in humid environments.

[0041] Example 3

[0042] Reference Figure 3 , Figure 6 as well as Figure 7 As shown, a preheating mechanism is installed on the filter cylinder 4. The preheating mechanism includes an annular cylinder 19 fixedly connected to the side wall of the filter cylinder 4. A heat-conducting fin 20 is fixedly connected to the inner wall of the annular cylinder 19. One end of the heat-conducting fin 20 is attached to the annular outer shell 7. The annular outer shell 7 is made of a material with good thermal conductivity. An annular heat exchange cylinder 44 is fixedly connected to the side wall of the separation cylinder 3. The heat-dissipating end of the semiconductor cooling chip 8 extends into the annular heat exchange cylinder 44. A heat exhaust pipe 45 is fixedly connected to the upper end of the annular heat exchange cylinder 44. A heat inlet pipe 47 is fixedly connected to the side wall of the annular cylinder 19. The heat exhaust pipe 45 is connected to the heat inlet pipe 47 through a connecting pipe 22. A discharge pipe 21 is fixedly connected to the side wall of the annular cylinder 19. The other end of the discharge pipe 21 extends to the outside of the detection box 1.

[0043] The preheating mechanism also includes a pump cylinder 23 fixedly connected to the top of the test chamber 1. A sliding plug 24 is slidably connected to the inner wall of the pump cylinder 23. A one-way air inlet pipe 25 is fixedly connected to the inner wall of the pump cylinder 23. The other end of the one-way air inlet pipe 25 extends to the outside of the test chamber 1. The one-way air inlet pipe 25 only allows external air to enter the pump cylinder 23. The pump cylinder 23 is connected to the annular heat exchange cylinder 44 through a one-way air outlet pipe 26. The one-way air outlet pipe 26 only allows air from the pump cylinder 23 to enter the annular heat exchange cylinder 44. A T-shaped rod 41 is fixedly connected to the lower end of the sliding plug 24. The lower end of the T-shaped rod 41 passes through the lower end of the pump cylinder 23. A spring 42 is sleeved on the side wall of the T-shaped rod 41. The two ends of the spring 42 are fixedly connected to the lower end of the sliding plug 24 and the bottom of the pump cylinder 23, respectively. One end of the rotating shaft 5 passes through the side wall of the filter cylinder 4 and is fixedly connected to a cam 43. The cam 43 slides against the lower end of the T-shaped rod 41.

[0044] Furthermore, as the rotating shaft 5 rotates, it drives the cam 43 to rotate, which, in conjunction with the spring 42, causes the T-shaped rod 41 to move up and down reciprocally, thereby driving the sliding plug 24 to reciprocate and seal. External air is then drawn into the pump cylinder 23 through the one-way inlet pipe 25. The air in the pump cylinder 23 then enters the annular heat exchange cylinder 44 through the one-way outlet pipe 26. The air flows upwards within the annular heat exchange cylinder 44, exchanging heat with the heat-dissipating end of the semiconductor refrigeration chip 8, carrying away the heat from the heat-dissipating end of the semiconductor refrigeration chip 8. Subsequently, the hot air enters the heat inlet pipe 47 through the heat exhaust pipe 45 and the connecting pipe 22, and then enters the annular cylinder 19. Within the annular cylinder 19, the hot air flows and exchanges heat with the heat-conducting fins 20. The heat-conducting fins 20 transfer heat through the annular outer shell 7 to the catalytic oxidation layer 601 and the filter element 6, thus improving the heat exchange between the filter element 6 and the catalytic oxidation layer 601. When a fuel cell vehicle is first started or the ambient temperature is low, the catalyst is in a low-temperature state, resulting in very low conversion efficiency for CO and VOCs, leading to inaccurate initial monitoring data. By recovering and utilizing the waste heat generated from exhaust gas dehumidification to heat the catalyst oxide layer 601, the catalyst oxide layer 601 is kept at an operating temperature of 50-70 degrees Celsius in the initial stage of contact with polluting gases. This immediately activates the catalyst, ensuring that the hydrogen concentration sensor 17 receives effectively purified gas from the moment the vehicle starts, significantly shortening the system response time and improving the real-time performance and accuracy of monitoring data. In addition, by preheating, the temperature of the catalyst oxide layer 601 is always higher than the dew point temperature of the exhaust gas. This ensures that moisture passes through in gaseous form, avoiding condensation, thereby maintaining the high specific surface area and permeability of the catalyst oxide layer 601, stabilizing its initial catalytic performance, and extending the maintenance cycle.

[0045] Example 4

[0046] Reference Figure 6 As shown, the heat-conducting fin 20 has multiple flow guide holes 46 on its sidewall, and all of the multiple flow guide holes 46 penetrate the heat-conducting fin 20.

[0047] Furthermore, when hot air flows inside the annular cylinder 19, it can circulate through the guide holes 46. On the one hand, this increases the contact area between the heat-conducting fins 20 and the hot air, thereby improving the heat conduction efficiency. On the other hand, it facilitates air circulation.

[0048] Example 5

[0049] Reference Figure 3 and Figure 6As shown, a regeneration mechanism is installed inside the detection box 1. The regeneration mechanism includes a differential pressure sensor 27 fixedly connected to the top of the detection box 1. Two pressure taps 28 are opened at the upper end of the filter cartridge 4. The two pressure taps 28 are connected to the differential pressure sensor 27 through two connecting pipes 29 respectively. Multiple electric heating wires 30 are fixedly embedded in the catalytic oxidation layer 601. The multiple electric heating wires 30 are all connected to the differential pressure sensor 27 through a PLC control circuit.

[0050] A cleaning mechanism is installed on the test chamber 1. The cleaning mechanism includes a gas storage box 31 fixedly connected to the upper end of the test chamber 1. The gas storage box 31 is filled with nitrogen. An inlet pipe 32 is fixedly connected to the side wall of the exhaust pipe 10. The other end of the inlet pipe 32 is connected to the gas storage box 31. A gas storage tank 33 is opened on the inner wall of the filter cylinder 4. A flushing pipe 34 is fixedly connected to the side wall of the pump pipe 11. The other end of the flushing pipe 34 is connected to the gas storage tank 33. A waste discharge pipe 35 is fixedly connected to the inner wall of the filter cylinder 4. The other end of the waste discharge pipe 35 extends to the outside of the test chamber 1. Solenoid valves 36 are installed on the inner walls of the exhaust pipe 10, pump pipe 11, inlet pipe 12, inlet pipe 13, inlet pipe 32, flushing pipe 34 and waste discharge pipe 35. The solenoid valves 36 are connected to the differential pressure sensor 27 through a PLC control circuit.

[0051] Furthermore, the differential pressure sensor 27 detects the pressure difference across the filter element 6 through the pressure taps 28 on both sides. As the filter element 6 gradually becomes clogged, the pressure difference increases. When the pressure difference reaches the threshold A, indicating a physical blockage, the differential pressure sensor 27 sends a signal to energize the solenoid valve 36 via the PLC control circuit. At this time, the solenoid valves 36 on the inner walls of the suction pipe 10, pump pipe 11, inlet pipe 12, and intake pipe 13 are energized and closed, while the solenoid valves 36 on the inner walls of the inlet pipe 32, flushing pipe 34, and waste discharge pipe 35 are energized and opened. The air pump 9 then extracts nitrogen from the gas storage tank 31 through the inlet pipe 32, and the nitrogen then flows through... Nitrogen gas enters the gas storage tank 33 through the flushing pipe 34 and is then sprayed onto the surface of the filter element 6 to perform a reverse flushing of the filter element 6, flushing out the impurities that clog the inside of the filter element 6. The impurities will be discharged through the discharge pipe 35, thus automatically cleaning the filter element 6 and ensuring a long-term filtration effect. If the pressure difference continues to increase and reaches the threshold B, the catalytic oxidation layer 601 will be saturated with adsorption. At this time, the pressure difference sensor 27 will energize the electric heating wire 30 through the PLC control circuit. The electric heating wire 30 will quickly heat the catalytic oxidation layer 601 to 300 degrees Celsius, which will decompose and desorb the adsorbed organic matter and restore catalytic activity.

[0052] It is worth mentioning that since the catalytic oxidation layer 601 has already been initially heated by the waste heat of the exhaust gas, the time and energy required to heat it to 300 degrees Celsius by the electric heating wire 30 will be less. Thus, by utilizing the waste heat generated by exhaust gas dehumidification, energy saving can be achieved.

[0053] It should be noted that when the catalytic oxidation layer 601 is heated, nitrogen is purged simultaneously, which can create an oxygen-free inert environment inside the entire filter cartridge 4 to prevent combustion and explosion during the heating process and protect the expensive catalytic oxidation layer 601 from being oxidized and damaged by high temperature.

[0054] Example 6

[0055] Reference Figure 8 As shown, a magnetic rotating rod 37 is rotatably connected to the inner wall of the filter cylinder 4. Multiple sector-shaped baffles 38 are fixedly connected to the side wall of the magnetic rotating rod 37. The side wall of each sector-shaped baffle 38 is tightly fitted to the inner wall of the filter cylinder 4. A bevel gear 39 is rotatably connected to the side wall of the magnetic rotating rod 37. The bevel gear 39 meshes with the bevel gear 15. An annular electromagnet 40 is fixedly connected to the side wall of the bevel gear 39. The annular electromagnet 40 is connected to the differential pressure sensor 27 through a PLC control circuit.

[0056] Furthermore, during the purging and cleaning of filter element 6, differential pressure sensor 27 synchronously energizes annular electromagnet 40 via PLC control circuit, causing it to become magnetic. This magnetic force then attracts the magnetic rotating rod 37. The rotation of bevel gear 15 drives bevel gear 39 to rotate, which in turn drives annular electromagnet 40 to rotate. Under the magnetic force, annular electromagnet 40 drives magnetic rotating rod 37 to rotate, which in turn drives sector-shaped baffle 38 to rotate. Sector-shaped baffle 38 periodically blocks air storage tank 33. During the period when air storage tank 33 is blocked, air is stored. Nitrogen gas is continuously introduced into the tank 33. The nitrogen gas accumulates and compresses in the tank 33, which increases the nitrogen pressure. When the fan-shaped baffle 38 rotates and moves away, the nitrogen gas will be ejected at a higher pressure, sweeping the surface of the filter element 6. Due to the periodic blocking of the fan-shaped baffle 38, nitrogen gas flow will be periodically sprayed to form a pulse jet, which can effectively break and peel off particles that are tightly attached to or even embedded in the surface of the filter material due to static electricity, moisture or van der Waals forces. Continuous low-pressure airflow can only remove loose dust on the surface, while the impact force of the pulse can solve the problem of caking.

[0057] It should be noted that by setting the transmission ratios of bevel gear 15 and bevel gear 2 16 and bevel gear 15 and bevel gear 39 respectively, the rotational speed of the magnetic rotating rod 37 is made greater than the rotational speed of the rotating shaft 5, thereby enabling the pulsed nitrogen gas flow to be sprayed onto all surfaces of the filter element 6.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fuel vehicle exhaust emission testing device, comprising a testing chamber (1), characterized in that, It also includes a pretreatment facility; The inner wall of the test chamber (1) is sealed and fixedly connected with an isolation plate (2), which divides the interior of the test chamber (1) into two parts: a test chamber (201) and a pretreatment chamber (202). The pretreatment mechanism includes a separation cylinder (3) fixedly connected to the inner wall of the pretreatment chamber (202). Multiple semiconductor cooling chips (8) are fixedly embedded in the inner wall of the separation cylinder (3). A filter cylinder (4) is fixedly connected to the side wall of the isolation plate (2). A rotating shaft (5) is rotatably connected to the inner wall of the filter cylinder (4). A filter element (6) is fixedly connected to the side wall of the rotating shaft (5). A catalytic oxidation layer (601) is fixedly connected to the side wall of the filter element (6). An annular shell (7) is fixedly connected to the inner wall of the filter cylinder (4). The side wall of the filter element (6) and the inner wall of the annular shell (7) are sealed and slidably connected. A sampling component for collecting exhaust gas from fuel vehicles is installed in the detection box (1).

2. The fuel vehicle exhaust emission detection device according to claim 1, characterized in that, The sampling assembly includes an air pump (9) fixedly connected to the inner wall of the detection box (1). The air pump (9) has an air inlet end fixedly connected to an air extraction pipe (10). The other end of the air extraction pipe (10) passes through the side wall of the detection box (1). The air pump (9) has an air outlet end fixedly connected to a pump pipe (11). The other end of the pump pipe (11) is connected to a separation cylinder (3). The upper end of the separation cylinder (3) is fixedly connected to an air inlet pipe (12). The other end of the air inlet pipe (12) is connected to a filter cylinder (4). The filter cylinder (4) is connected to the detection chamber (201) through an air inlet pipe (13).

3. The fuel vehicle exhaust emission detection device according to claim 2, characterized in that, The filter cylinder (4) is equipped with a rotating mechanism, which includes a motor (14) fixedly connected to the upper end of the filter cylinder (4). The output end of the motor (14) passes through the top of the filter cylinder (4) and is fixedly connected to a bevel gear (15). One end of the rotating shaft (5) is fixedly connected to a bevel gear (16). The bevel gear (15) and the bevel gear (16) are meshed together.

4. The fuel vehicle exhaust emission detection device according to claim 3, characterized in that, A preheating mechanism is installed on the filter cylinder (4). The preheating mechanism includes an annular cylinder (19) fixedly connected to the side wall of the filter cylinder (4). A heat-conducting fin (20) is fixedly connected to the inner wall of the annular cylinder (19). One end of the heat-conducting fin (20) is attached to the annular shell (7). The annular shell (7) is made of a material with good thermal conductivity. An annular heat exchange cylinder (44) is fixedly connected to the side wall of the separation cylinder (3). The heat-releasing end of the semiconductor cooling chip (8) extends into the annular heat exchange cylinder (44). A heat exhaust pipe (45) is fixedly connected to the upper end of the annular heat exchange cylinder (44). A heat inlet pipe (47) is fixedly connected to the side wall of the annular cylinder (19). The heat exhaust pipe (45) is connected to the heat inlet pipe (47) through a connecting pipe (22). A discharge pipe (21) is fixedly connected to the side wall of the annular cylinder (19). The other end of the discharge pipe (21) extends to the outside of the detection box (1).

5. The fuel vehicle exhaust emission detection device according to claim 4, characterized in that, The preheating mechanism also includes a pump cylinder (23) fixedly connected to the top of the test chamber (1). A sliding plug (24) is slidably connected to the inner wall of the pump cylinder (23). A one-way air inlet pipe (25) is fixedly connected to the inner wall of the pump cylinder (23). The other end of the one-way air inlet pipe (25) extends to the outside of the test chamber (1). The pump cylinder (23) is connected to the annular heat exchange cylinder (44) through a one-way air outlet pipe (26). The sliding plug (24) A T-shaped rod (41) is fixedly connected to the lower end. The lower end of the T-shaped rod (41) passes through the lower end of the air pump cylinder (23). A spring (42) is sleeved on the side wall of the T-shaped rod (41). The two ends of the spring (42) are fixedly connected to the lower end of the slide plug (24) and the bottom of the air pump cylinder (23) respectively. One end of the rotating shaft (5) passes through the side wall of the filter cylinder (4) and is fixedly connected to a cam (43). The cam (43) slides against the lower end of the T-shaped rod (41).

6. The fuel vehicle exhaust emission detection device according to claim 4, characterized in that, The heat-conducting fin (20) has multiple flow guide holes (46) on its sidewall, and all of the multiple flow guide holes (46) penetrate the heat-conducting fin (20).

7. The fuel vehicle exhaust emission detection device according to claim 3, characterized in that, The detection box (1) is equipped with a regeneration mechanism, which includes a differential pressure sensor (27) fixedly connected to the top of the detection box (1). The filter cylinder (4) has two pressure taps (28) at its upper end. The two pressure taps (28) are connected to the differential pressure sensor (27) through two connecting pipes (29). Multiple electric heating wires (30) are fixedly embedded in the catalytic oxidation layer (601). The multiple electric heating wires (30) are all connected to the differential pressure sensor (27) through a PLC control circuit.

8. The fuel vehicle exhaust emission detection device according to claim 7, characterized in that, The testing box (1) is equipped with a cleaning mechanism, which includes a gas storage box (31) fixedly connected to the upper end of the testing box (1). The gas storage box (31) is filled with nitrogen. An inlet pipe (32) is fixedly connected to the side wall of the extraction pipe (10). The other end of the inlet pipe (32) is connected to the gas storage box (31). An air storage groove (33) is opened on the inner wall of the filter cylinder (4). A flushing pipe (34) is fixedly connected to the side wall of the pump pipe (11). The other end is connected to the gas storage tank (33). The filter cylinder (4) is fixedly connected to the inner wall of the discharge pipe (35). The other end of the discharge pipe (35) extends to the outside of the detection box (1). The inner walls of the suction pipe (10), pump pipe (11), air inlet pipe (12), air inlet pipe (13), inlet pipe (32), flushing pipe (34) and discharge pipe (35) are all equipped with solenoid valves (36). The solenoid valves (36) are connected to the differential pressure sensor (27) through the PLC control circuit.

9. The fuel vehicle exhaust emission detection device according to claim 8, characterized in that, The inner wall of the filter cylinder (4) is rotatably connected to a magnetic rotating rod (37). The side wall of the magnetic rotating rod (37) is fixedly connected to multiple fan-shaped baffles (38). The side wall of each fan-shaped baffle (38) is tightly fitted to the inner wall of the filter cylinder (4). The side wall of the magnetic rotating rod (37) is rotatably connected to a bevel gear three (39). The bevel gear three (39) meshes with bevel gear one (15). The side wall of the bevel gear three (39) is fixedly connected to a ring electromagnet (40). The ring electromagnet (40) is connected to a differential pressure sensor (27) through a PLC control circuit.

10. The fuel vehicle exhaust emission detection device according to claim 1, characterized in that, A hydrogen concentration sensor (17) is fixedly connected to the inner wall of the detection chamber (201), and an exhaust port (18) is provided on the inner wall of the detection chamber (201).

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