Automobile exhaust emission filtering system for EMC experiment and EMC laboratory

Abstract

The utility model provides a kind of automobile exhaust emission filtering system and EMC laboratory for EMC experiment, including interface, discharge pipeline, ventilation waveguide window and exhaust fan;Discharge pipeline includes rotating pipe section and fixed pipe section, fixed pipe section is arranged below rotary table, rotating pipe section is fixedly installed on rotary table, and can rotate relative to fixed pipe section under the drive of rotary table;Interface is installed in one end of rotating pipe section, and is correspondingly arranged at the tail gas exhaust port of experimental car, and the tail gas reaches outdoor after passing through ventilation waveguide window arranged in the side wall of shielding body under the action of exhaust fan.The utility model passes through the interface corresponding to the exhaust port of car, and is discharged to outdoor after passing through pipeline with rotary joint and ventilation waveguide window, and the overall system can adapt to EMC experimental scene with rotary table, can discharge in real time during experiment, ensure that the toxic gas and dangerous gas in clean electric wave darkroom are discharged, ensure normal test and personnel safety of vehicle.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic compatibility testing technology, specifically to an automotive exhaust emission filtration system and an EMC laboratory for EMC experiments. Background Technology

[0002] An anechoic chamber is an essential piece of equipment in EMC testing, providing a shielded testing environment that prevents electromagnetic leakage. When conducting whole-vehicle EMC testing in an anechoic chamber, the vehicle is set to normal operating conditions.

[0003] There are several common types of automotive energy: traditional gasoline-powered vehicles, electric vehicles, and hydrogen fuel cell vehicles, which are expected to see significant future growth. Both gasoline-powered and hydrogen fuel cell vehicles produce exhaust emissions during normal operation. Gasoline exhaust is toxic and must be vented outdoors. Hydrogen-powered vehicles produce a large amount of water, and due to incomplete combustion, hydrogen residue is also emitted. Since hydrogen is a flammable and explosive gas, it cannot be left in dark rooms after emission, as this could accumulate and pose a potential risk; therefore, it must also be promptly vented outdoors.

[0004] Patent document CN208766243U discloses a top-mounted exhaust device for shielded rooms or anechoic chambers, comprising an air conditioning ventilation waveguide window, an exhaust ventilation waveguide window, a powerful magnet, a non-metallic plastic pipe, a non-metallic plastic film pipe, and an air inlet. This invention utilizes the principle of rising hot air, placing the air inlet above the sample being tested, and adding an external exhaust fan to ensure air circulation within the anechoic chamber, effectively expelling pollutants. Furthermore, with the air inlet above the sample, it is less likely to attract large particles that could clog the filter screen. The non-metallic plastic film pipe facilitates maintenance and replacement, and reduces or eliminates the introduction of other electromagnetic interference issues. However, this solution is not suitable for EMC testing scenarios, as it cannot monitor vehicle exhaust emissions in real-time during experiments. Utility Model Content

[0005] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide an automotive exhaust emission filtration system and an EMC laboratory for EMC testing.

[0006] The automotive exhaust emission filtration system for EMC testing provided by this utility model includes an interface, an emission pipe, a ventilation waveguide window, and an exhaust fan.

[0007] The discharge pipe includes a rotating pipe section and a fixed pipe section. The fixed pipe section is located below the turntable, and the rotating pipe section is fixedly installed on the turntable and can rotate relative to the fixed pipe section under the drive of the turntable.

[0008] The interface is installed at one end of the rotating pipe section and is correspondingly located at the exhaust port of the experimental vehicle. The other end of the rotating pipe section is rotatably connected to one end of the fixed pipe section through a rotating joint. The other end of the fixed pipe section passes through the ventilation waveguide window set on the side wall of the shield and reaches the outside, and is connected to the exhaust fan.

[0009] Preferably, the side of the interface closest to the exhaust port of the test vehicle is a horn-shaped structure, and the end of the horn-shaped structure is used to cover the exhaust port.

[0010] Preferably, the rotating pipe section includes an inner rotating pipe section, an outer rotating pipe section, and a check valve box;

[0011] The internal rotating pipe section is fixedly installed inside the turntable. One end of the internal rotating pipe section is connected to the fixed pipe section, and the other end of the internal rotating pipe section extends to the upper surface of the turntable and is connected to the check valve box.

[0012] One end of the external rotating pipe section is connected to the check valve box, and the other end of the external rotating pipe section is connected to the docking port.

[0013] Preferably, both the internal rotating pipe section and the fixed pipe section comprise rigid metal pipes.

[0014] Preferably, the external rotating pipe section includes a flexible hose.

[0015] Preferably, the bottom of the fixed pipe section is provided with a bend.

[0016] Preferably, the curved portion is connected to a drainage pipe.

[0017] The EMC laboratory provided by this utility model includes the aforementioned automobile exhaust emission filtration system for EMC experiments.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model provides a system that discharges gases to the outside through a pipe with a rotating joint and a ventilation waveguide window, with the exhaust port corresponding to the vehicle's exhaust outlet. The entire system is designed to be suitable for EMC test scenarios with turntables, and can exhaust gases in real time during the test, ensuring the maximum removal of toxic and dangerous gases from the anechoic chamber, thus guaranteeing normal vehicle testing and personnel safety. Attached Figure Description

[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a structural schematic diagram of the ventilation waveguide window in this utility model from a frontal view.

[0023] Figure 3 This is a structural schematic diagram of the ventilation waveguide window in this utility model from a side view angle.

[0024] The diagram shows:

[0025] Interface 1 Shielding 4

[0026] Check valve box 2, ventilation waveguide window 5

[0027] Rotational joint 3 Detailed Implementation

[0028] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0029] This utility model discloses an automotive exhaust emission filtration system and an EMC laboratory for EMC experiments. By setting up a docking interface corresponding to the vehicle's exhaust port, and by setting up a pipeline with a rotating joint and a ventilation waveguide window to discharge to the outside, the entire system design can be adapted to EMC experimental scenarios with turntables. It can exhaust in real time during the experiment, ensuring the maximum removal of toxic and dangerous gases from the anechoic chamber, thus ensuring normal vehicle testing and personnel safety.

[0030] According to the automotive exhaust emission filtration system for EMC testing provided by this utility model, such as Figure 1 As shown, it includes an interface 1, an exhaust pipe, a ventilation waveguide window 5, and an exhaust fan 5. The exhaust pipe includes a rotating pipe section and a fixed pipe section. The fixed pipe section is located below the turntable, and the rotating pipe section is fixedly installed on the turntable and can rotate relative to the fixed pipe section under the drive of the turntable. The interface 1 is installed at one end of the rotating pipe section and is correspondingly located at the exhaust port of the experimental vehicle. The other end of the rotating pipe section is rotatably connected to one end of the fixed pipe section through a rotating joint 3. The other end of the fixed pipe section passes through the ventilation waveguide window 5 located on the side wall of the shield 4 and reaches the outside, where it is connected to the exhaust fan 5.

[0031] This invention divides the pipeline into a fixed pipe section that is fixedly installed in the space at the bottom of the turntable and a rotating pipe section that rotates synchronously with the turntable. The two are connected by a rotating joint, so that the interface 1 can rotate with the turntable in real time, thereby ensuring that it corresponds to the car exhaust port in real time during the EMC test and realizing real-time exhaust in the EMC test.

[0032] In a preferred embodiment, the side of the interface 1 closest to the exhaust port of the experimental vehicle is a horn-shaped structure, with the end of the horn-shaped structure used to cover the exhaust port. By adopting a horn-shaped interface 1, the problem of connecting the vehicle's exhaust port is solved. Vehicle exhaust ports are typically circular with a small diameter. To minimize exhaust leakage, the interface 1 on the turntable side is designed as a horn-shaped interface 1, expanding the receiving area and range, similar in principle to a range hood.

[0033] In a preferred embodiment, the rotating pipe section includes an inner rotating pipe section, an outer rotating pipe section, and a check valve box 2. The inner rotating pipe section is fixedly installed inside the turntable, with one end connected to the fixed pipe section and the other end extending to the upper surface of the turntable and connected to the check valve box 2. One end of the outer rotating pipe section is connected to the check valve box 2, and the other end is connected to the connector 1. By setting the check valve box 2, the problem of blockage in the pipeline or inability to drain in time is solved.

[0034] In more preferred embodiments, both the internal rotating pipe section and the fixed pipe section include rigid metal pipes, while the external rotating pipe section includes flexible hoses. Specifically, the pipe section above the turntable used to connect the interface 1 and the check valve box 2 uses a flexible hose, while the pipe section below the turntable used to connect the check valve box 2 and the external exhaust end uses a rigid metal pipe. For instance, the temperature of the gas just exhausted from the car can reach approximately 200°C. Therefore, for the part above the turntable that connects to the car's exhaust pipe, a special flexible hose capable of withstanding temperatures above 200°C is required. The flexible hose facilitates adjustment of its position and length.

[0035] By setting a rotating joint between the fixed pipe section and the rotating pipe section, the problem of the exhaust pipe under the turntable rotating with the turntable is solved. Since the exhaust pipe under the turntable is basically made of high-temperature resistant metal material and is a rigid pipe, a rotating joint was designed in the center of the turntable to ensure that there will be no disengagement problem during 360° rotation and to ensure the sealing integrity of the pipeline.

[0036] In a preferred embodiment, the bottom of the fixed pipe section is provided with a bend. The bend connects to a drainage pipe. During hydrogen fuel cell vehicle testing, a large amount of water vapor cools to produce liquid water. Therefore, by designing the pipe into a bend shape at a lower position near the ground below the turntable, the liquid water and gas can be separated, allowing the water to be drained through other pipes.

[0037] The primary consideration in waveguide window design is the upper cutoff frequency of the shielding, typically 20GHz or 40GHz. Higher frequencies require smaller waveguide aperture diameters, resulting in greater wind resistance, which hinders ventilation and the passage of large particles. Therefore, factors such as increasing the cross-sectional area need to be considered. In a preferred embodiment, such as... Figure 2 , Figure 3 As shown, the specific dimensions of the ventilation waveguide window 5 are disclosed.

[0038] In this invention, due to the relatively long and winding pipes inside the darkroom, coupled with the wind resistance of the ventilation waveguide window 5, sufficient margin must be considered for the power and airflow of the external forced exhaust fan. The length, height, and bends of the external pipes are all incorporated into the calculation of the fan power and airflow. This ensures that a strong negative pressure suction port is formed at the flared opening connecting to the car exhaust outlet inside the darkroom, thereby guaranteeing the complete capture of exhaust gases.

[0039] The EMC laboratory provided by this utility model includes the aforementioned automotive exhaust emission filtration system for EMC experiments. During the EMC experiment, the automotive exhaust outlet is aligned with a horn-shaped connector 1. A high-temperature resistant hose behind the horn-shaped connector 1 connects to the turntable opening, passes through a check valve box 2, and connects to a rigid pipe below the turntable. The rigid pipe leads to a rotating joint 3 below the center of the turntable. After descending from the rotating joint, the exhaust undergoes a water-gas separation filtration process before rising to a ventilation waveguide window 5. The exhaust is then discharged outdoors through a powerful exhaust fan and piping outside the shielding enclosure. The entire system design maximizes the removal of toxic and hazardous gases from the anechoic chamber, ensuring normal vehicle testing and personnel safety.

[0040] This invention, through the design of a forced exhaust system, creates a complete sealed and negative pressure system from the vehicle's exhaust pipe to the outside, effectively and promptly expelling all toxic and dangerous gases, ensuring the safety of the anechoic chamber. In the current market era where gasoline and new energy vehicles coexist, and with the government's strong focus on the development and promotion of new energy vehicles, the demand for anechoic chambers, essential for vehicle EMC testing, is surging. Accordingly, this invention has promising application prospects.

[0041] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A vehicle exhaust emission filtration system for EMC testing, characterized in that, This includes the interface (1), the discharge pipe, the ventilation waveguide window (5), and the exhaust fan; The discharge pipe includes a rotating pipe section and a fixed pipe section. The fixed pipe section is located below the turntable, and the rotating pipe section is fixedly installed on the turntable and can rotate relative to the fixed pipe section under the drive of the turntable. The interface (1) is installed at one end of the rotating pipe section and is correspondingly set at the exhaust port of the experimental vehicle. The other end of the rotating pipe section is rotatably connected to one end of the fixed pipe section through the rotating joint (3). The other end of the fixed pipe section passes through the ventilation waveguide window (5) set on the side wall of the shield (4) and reaches the outside, and is connected to the exhaust fan.

2. The automotive exhaust emission filtration system for EMC testing according to claim 1, characterized in that, The interface (1) has a horn-shaped structure on the side near the exhaust port of the test vehicle, and the end of the horn-shaped structure is used to cover the exhaust port.

3. The automotive exhaust emission filtration system for EMC testing according to claim 1, characterized in that, The rotating pipe section includes an internal rotating pipe section, an external rotating pipe section, and a check valve box (2); The internal rotating pipe section is fixedly installed inside the turntable. One end of the internal rotating pipe section is connected to the fixed pipe section, and the other end of the internal rotating pipe section extends to the upper surface of the turntable and is connected to the check valve box (2). One end of the external rotating pipe section is connected to the check valve box (2), and the other end of the external rotating pipe section is connected to the docking port (1).

4. The automotive exhaust emission filtration system for EMC testing according to claim 3, characterized in that, Both the internal rotating pipe section and the fixed pipe section consist of rigid metal pipes.

5. The automotive exhaust emission filtration system for EMC testing according to claim 3, characterized in that, The external rotating pipe section includes a hose.

6. The automotive exhaust emission filtration system for EMC testing according to claim 1, characterized in that, The bottom of the fixed pipe section is provided with a bend.

7. The automotive exhaust emission filtration system for EMC testing according to claim 6, characterized in that, The curved section is connected to a drainage pipe.

8. An EMC laboratory, characterized in that, Including the automotive exhaust emission filtration system for EMC testing as described in any one of claims 1-7.

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