A special nozzle for a vehicle-mounted pulse self-cleaning air filter and its self-cleaning backflush structure.

Abstract

This invention discloses a special nozzle for a vehicle-mounted pulse self-cleaning air filter and its self-cleaning backflushing structure. The invention features a novel nozzle structure. A connecting cover is distributed at the front end of the nozzle body, and multiple air jet holes are evenly opened around the perimeter of the connecting cover. A flow-dividing baffle is then installed at the outer end of the connecting cover, located outside the multiple air jet holes. Through the obstruction of the flow-dividing baffle, a portion of the airflow is transported out from around the baffle to backflush the rear perimeter of the cartridge filter. Another portion of the high-speed airflow is blocked by the flow-dividing baffle, reducing its pressure. This portion of the airflow can then backflush and clean the front perimeter of the cartridge filter. This achieves a uniform backflushing effect, ensuring that both the front and rear perimeters of the cartridge filter receive a sufficiently consistent backflushing cleaning effect, significantly improving the automatic dust removal efficiency of the vehicle-mounted air filter.

Description

Technical Field

[0001] This invention belongs to the field of special nozzle technology for air filters, and particularly relates to a special nozzle for vehicle-mounted pulse self-cleaning air filters and its self-cleaning backflush structure. Background Technology

[0002] As early as the 1960s, after the world successfully developed a high-efficiency filter paper with considerable filtration accuracy, high air permeability, and high burst strength, the pulse self-cleaning air filter emerged. It uses time or pressure difference control, with a time-series pulse controller controlling a set of electromagnetic pulse valves, to perform pulse backwashing of the filter element with compressed air at a certain pressure, cleaning away accumulated dust, reducing the inlet pressure difference, and extending the filter element's lifespan. Based on this concept, the world's first pulse self-cleaning air filter was successfully developed, and it was quickly and widely used in many applications requiring air purification, such as gas turbines, large air compressors, and factory ventilation. Tens of thousands of these pulse self-cleaning air filters are currently in use in my country. Our company is promoting the application of this technology to military vehicles and wide-body vehicles, and needs to solve a series of technical problems. Unexpectedly, the backwashing effect of the pulse self-cleaning air filter is not good. The backwashing structure of this pulse self-cleaning air filter is as follows... Figure 1 As shown, backflushing airflow is intermittently injected into the filter 9 through the pulse jet pipe 91. However, only about half of each filter element is backflushed, i.e., backflushing cleaning can be performed in direction A, while the other half 92 is not backflushed. This seemingly strange phenomenon was observed in our indoor experiments. Firstly, the airflow field changes during backflushing of a pulse self-cleaning air filter are extremely complex, involving many physical parameters. To ensure that the backflushing effect is basically consistent across all parts of the filter element, effective improvement methods can only be found through repeated simulation experiments guided by theories based on engineering thermodynamics, aerodynamics, and fluid mechanics. Summary of the Invention

[0003] To address the shortcomings of the existing technology, the present invention provides a special nozzle for a vehicle-mounted pulse self-cleaning air filter that achieves uniform backflushing and consistent backflushing effect, and a self-cleaning backflushing structure for its application.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A special nozzle for a vehicle-mounted pulse self-cleaning air filter includes a nozzle body, a flow divider, and a connecting cover; the connecting cover is distributed at the front end of the nozzle body; multiple air jet holes are evenly opened around the connecting cover; the flow divider is installed at the outer end of the connecting cover; the flow divider is located outside the multiple air jet holes.

[0005] Furthermore, the connecting cover has a conical structure with a smaller outer end and a larger inner end.

[0006] Furthermore, the number of jet holes is 4 to 10.

[0007] Furthermore, the outer end of the connecting cover is provided with a connecting block; the connecting block has a conical structure with a larger outer end and a smaller inner end; the diversion baffle is installed on the outer end of the connecting block.

[0008] Furthermore, the connecting block, connecting cover, and nozzle body are integrally formed.

[0009] Furthermore, the center of the diversion baffle is fixed to the outer end of the connecting block by screws.

[0010] Furthermore, the centerline of the jet hole forms an angle of 40 to 80° with the centerline of the nozzle body.

[0011] Furthermore, the diversion baffle has a circular plate structure.

[0012] A self-cleaning backflush structure includes a special nozzle, a cylindrical filter, and a pulse backflush airflow pipe; the special nozzle is installed at the outer end of the pulse backflush airflow pipe; the special nozzle is distributed at the center of one end of the cylindrical filter.

[0013] The beneficial effects of this invention are as follows: This invention features a novel nozzle structure. A connecting shroud is distributed at the front end of the nozzle body, with multiple air jet holes evenly spaced around the shroud. A flow-dividing baffle is then installed at the outer end of the shroud, positioned outside the air jet holes. This baffle obstructs the airflow, allowing a portion of the airflow to be transported out from around the baffle to backwash the rear perimeter of the cartridge filter. Meanwhile, another portion of the high-speed airflow is blocked by the baffle, reducing its pressure. This portion of the airflow can then backwash the front perimeter of the cartridge filter, achieving a uniform backwashing effect. This ensures that both the front and rear perimeters of the cartridge filter receive a thorough and consistent backwashing, significantly improving the automatic dust removal efficiency of the vehicle air filter. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an existing backflush structure.

[0015] Figure 2 This is a schematic diagram of the structure of the special nozzle of the present invention.

[0016] Figure 3 This is a schematic diagram of the self-cleaning backflush structure of the present invention. Detailed Implementation

[0017] The invention will now be described in further detail with reference to the accompanying drawings.

[0018] like Figure 2As shown, a special nozzle for a vehicle-mounted pulse self-cleaning air filter includes a nozzle body 1, a flow divider 2, and a connecting cover 3. The connecting cover 3 is distributed at the front end of the nozzle body 1. Multiple air jet holes 31 are evenly distributed around the connecting cover 3. The flow divider 2 is installed at the outer end of the connecting cover 3, and the flow divider 2 is located outside the multiple air jet holes 31. Further, the connecting cover 3 has a conical structure with a smaller outer end and a larger inner end. Further, the number of air jet holes 31 is 4 to 10, preferably 6. Further, a connecting block 32 is provided at the outer end of the connecting cover 3; the connecting block 32 has a conical structure with a larger outer end and a smaller inner end; the flow divider 2 is installed at the outer end of the connecting block. Further, the connecting block 32, the connecting cover 3, and the nozzle body 1 are integrally formed. Further, the center of the flow divider 2 is fixed and welded to the outer end of the connecting block by screws 21. Further, the centerline of the air jet hole 31 forms an angle of 40 to 80° with the centerline of the nozzle body 1, preferably 60°. Furthermore, the diversion baffle 2 has a circular plate structure.

[0019] like Figure 3 As shown, a self-cleaning backflush structure includes a special nozzle 4, a cylindrical filter 5, and a pulse backflush airflow pipe 6; the special nozzle 4 is installed at the outer end of the pulse backflush airflow pipe 6; the special nozzle 4 is distributed at the center of one end of the cylindrical filter 5.

[0020] This invention designs a novel nozzle structure. By distributing connecting covers 3 at the front end of the nozzle body 1, and evenly opening multiple air jet holes 31 around the connecting covers 3, and then installing a flow divider 2 at the outer end of the connecting covers 3, the flow divider 2 is located outside the multiple air jet holes 31. Thus, through the obstruction of the flow divider 2, part of the airflow is delivered from around the flow divider 2 to backwash the rear perimeter of the cartridge filter 5. Another part of the high-speed airflow is blocked by the flow divider 2, and the pressure of this part of the airflow is reduced. This part of the airflow can back-flushing clean the front perimeter of the cartridge filter 5. This achieves a uniform back-flushing effect, so that the front and rear perimeters of the cartridge filter 5 receive a fully consistent back-flushing cleaning effect, which greatly improves the automatic dust removal effect of the vehicle air filter.

[0021] Diversion baffle 2Ø X Determining the dimensions is a highly complex design and calculation process. Only by establishing a general range under theoretical guidance and conducting repeated experiments simulating real filter elements and pulsed airflow parameters (supply pressure, pulse width, and pulse period) can the optimal values ​​be obtained. However, the experiments must be conducted under theoretical guidance, requiring the prior preparation of six filters of varying sizes (Ø). XThe size of the diversion baffle 2 can be compared by installing it from small to large. Repeating the above test, it was found that after installing the diversion baffle 2, the swing angle θ of the movable baffle or sticker away from the cartridge filter 5 changed significantly. That is, as the diversion baffle 2 gradually increases, the swing angle θ of the baffle near the nozzle gradually increases. When the swing angle tends to be consistent front and back, this is the optimal diameter Øx of the diversion baffle 2.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A special nozzle for a vehicle-mounted pulse self-cleaning air filter, characterized in that, It includes a nozzle body, a flow divider baffle, and a connecting cover; the connecting cover is distributed at the front end of the nozzle body; multiple air jet holes are evenly opened around the connecting cover; the flow divider baffle is installed at the outer end of the connecting cover; the flow divider baffle is located outside the multiple air jet holes.

2. The special nozzle for the vehicle-mounted pulse self-cleaning air filter according to claim 1, characterized in that, The connecting cover has a conical structure with a smaller outer end and a larger inner end.

3. The special nozzle for the vehicle-mounted pulse self-cleaning air filter according to claim 1, characterized in that, The number of jet holes is 4 to 10.

4. The special nozzle for the vehicle-mounted pulse self-cleaning air filter according to claim 1, characterized in that, The outer end of the connecting cover is provided with a connecting block; the connecting block has a conical structure with a larger outer end and a smaller inner end; the diversion baffle is installed on the outer end of the connecting block.

5. The special nozzle for a vehicle-mounted pulse self-cleaning air filter according to claim 4, characterized in that, The connecting block, connecting cover, and nozzle body are integrally molded structures.

6. The special nozzle for a vehicle-mounted pulse self-cleaning air filter according to claim 4, characterized in that, The center of the diversion baffle is fixed to the outer end of the connecting block by screws.

7. The special nozzle for a vehicle-mounted pulse self-cleaning air filter according to claim 1, characterized in that, The centerline of the jet orifice forms an angle of 40 to 80° with the centerline of the nozzle body.

8. The special nozzle for a vehicle-mounted pulse self-cleaning air filter according to claim 1, characterized in that, The diversion baffle has a circular plate structure.

9. A self-cleaning backflush structure, characterized in that, It includes a special nozzle, a cylindrical filter, and a pulse backflush airflow pipe; the special nozzle is installed at the outer end of the pulse backflush airflow pipe; the special nozzle is distributed at the center of one end of the cylindrical filter.

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