Pre-filter of roots blower and filter core cleaning device thereof

Abstract

The application discloses a pre-filter of Roots blower and a filter element cleaning device thereof, which comprises a closed shell arranged vertically, a filter cylinder assembly coaxially arranged in the shell, a top end of the filter cylinder assembly being connected with a fixed ring through a flexible sealing ring, the fixed ring being fixedly connected to an inner wall of the shell, and a screw cover assembly being fixedly connected to a bottom end of the filter cylinder assembly; the application has the beneficial effects that: the filter cylinder assembly of the pre-filter adopts a floating type connection structure, and a screw cover assembly and an elastic sheet assembly are designed at the bottom and the inside of the filter cylinder assembly, the filter cylinder assembly can be driven to rotate by the wind speed power of an air inlet, the filter cylinder assembly forms a dynamic balance in the filtering operation, and continuous micro-vibration is generated, so that the fine powder particles are prevented from being excessively attached to the surface of the filter cylinder, and the risk of blockage is reduced.

Description

Technical Field

[0001] This invention relates to the field of filter equipment technology for Roots blowers, and more particularly to a pre-filter for Roots blowers and its filter element cleaning device. Background Technology

[0002] In the field of negative pressure conveying production technology for powder materials, the layout of process equipment typically includes a feed hopper, a cyclone hopper, a pre-filter, and a Roots blower. The Roots blower serves as the negative pressure power source, the cyclone hopper is the primary filtration and unloading device, and the pre-filter is the secondary filtration and unloading device. The main function of the pre-filter is to intercept fine powder escaping from the cyclone hopper. If fine powder enters the Roots blower, it can cause permanent damage to the equipment. During production operation, the filter element of the pre-filter inevitably becomes clogged, leading to increased air pressure in the Roots blower. High negative pressure causes the Roots blower to spray material, polluting the environment and increasing air velocity, resulting in rapid wear of the filter element. To reduce air pressure, frequent shutdowns are required to backflush the filter element, affecting normal production and leading to low production efficiency. Furthermore, the wear condition varies significantly at different locations on the filter element; severe wear at one location necessitates replacing the entire filter element, resulting in resource waste. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] The purpose of this invention is to provide a pre-filter for a Roots blower and a filter element cleaning device thereon, in order to solve the technical problem that the pre-filter in the prior art requires frequent backflushing, which affects production efficiency.

[0005] (II) Technical Solution

[0006] The present invention relates to a pre-filter for a Roots blower and a filter element cleaning device thereof, comprising a vertically arranged enclosed housing, a filter cartridge assembly coaxially arranged within the housing, the top end of the filter cartridge assembly being connected to a fixing ring via a flexible sealing ring, the fixing ring being fixedly connected to the inner wall of the housing, a screw cap assembly being fixedly connected to the bottom end of the filter cartridge assembly, an air inlet pipe being vertically arranged directly below the screw cap assembly, the air inlet pipe being fixedly installed on the housing, a discharge pipe being installed at the bottom of the enclosed housing, a bottom-closed central air duct being coaxially arranged within the filter cartridge assembly, the top end of the central air duct extending outside the housing, a plurality of air suction holes being formed on the outer wall of the central air duct, the central air duct being connected to the filter cartridge assembly via a spring assembly, a backflush pipe being installed on the central air duct, and air valves being installed on both the backflush pipe and the central air duct.

[0007] Furthermore, the filter cartridge assembly includes several filter cartridge units connected in sequence, any two adjacent filter cartridge units are fixedly connected by a snap fastener, and a sealing ring is provided between any two adjacent filter cartridge units.

[0008] Furthermore, the filter cartridge unit includes a cylindrical filter screen, with annular frames fixedly connected to both the upper and lower ends of the filter screen.

[0009] Furthermore, the fastener includes a fixing plate fixedly connected to the outer wall of the annular frame, and a snap-fit ​​connector with a right-angled triangle cross-section is provided at the end of the fixing plate. The snap-fit ​​connector snaps onto the adjacent annular frame, and a plurality of notches adapted to the snap-fit ​​connector are also provided on the annular frame.

[0010] Furthermore, the spring assembly includes a spring, and several positioning blocks are connected to the inner wall of the annular frame. Insertion slots are provided on the positioning blocks, and the spring is slidably inserted into the insertion slots. The spring is made of stainless steel and the thickness of the spring is less than 1 mm.

[0011] Furthermore, the spiral cap assembly includes a conical cap with a diameter that gradually decreases from top to bottom. Several arc-shaped air guide plates are evenly distributed on the outer circumferential surface of the conical cap, and the air guide plates are spirally distributed on the outer circumferential surface of the conical cap.

[0012] Furthermore, the bottom of the conical cover is coated with a wear-resistant coating, and the bottom of the conical cover is hemispherical.

[0013] Furthermore, the sealing ring is made of TPU, and the cross-section of the sealing ring is wavy.

[0014] Furthermore, the bottom surface of the housing is sloped, and the air inlet pipe is located at the lowest end of the housing.

[0015] Furthermore, a sealing cover is fixedly fitted onto the central air duct, the bottom end of the sealing cover is fixedly connected to the fixing ring, a sealing ring is provided between the sealing cover and the fixing ring, and the sealing cover is located inside the enclosed housing.

[0016] (III) Beneficial Effects

[0017] The beneficial effects of this invention are as follows: This invention adopts a floating connection structure for the filter cartridge assembly of the pre-filter, and designs a spiral cap assembly and a spring assembly at the bottom and inside of the filter cartridge assembly. The airflow from the inlet drives the filter cartridge assembly to rotate, creating a dynamic balance during filtration and generating continuous micro-vibrations. This prevents excessive fine particles from adhering to the filter cartridge surface, reducing the risk of clogging. Furthermore, it allows for a short-term reduction in the speed of the Roots blower, lowering the airflow at the inlet. Due to the rebound effect of the spring assembly, the filter cartridge assembly generates a stronger swirling vibration, shaking off fine particles adhering to the filter screen, achieving a preliminary cleaning effect on the filter cartridge. This significantly reduces the frequency of backflushing the filter cartridge, requiring only thorough backflushing during major equipment overhauls to meet operational needs and improve overall production efficiency. Simultaneously, the layered design of the filter cartridge assembly allows for replacement of specific filter cartridge units based on actual wear, eliminating the need to replace the entire filter cartridge assembly, saving resources and reducing production costs. This design is worthy of widespread adoption. Attached Figure Description

[0018] Figure 1 This is a perspective view of the internal structure of the present invention;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 for Figure 2 Sectional view along AA;

[0021] Figure 4 for Figure 2 A schematic diagram of the enlarged structure of part B;

[0022] Figure 5 This is a perspective view of the filter cartridge assembly of the present invention;

[0023] Figure 6 This is a perspective view of the central air duct of the present invention;

[0024] Figure 7 This is a perspective view of the filter cartridge unit of the present invention;

[0025] In the diagram, the components are: 1. Housing; 2. Filter cartridge assembly; 3. Filter screen; 5. Annular frame; 6. Fastener; 7. Fixing plate; 8. Connector; 9. Sealing ring; 10. Positioning block; 11. Insertion groove; 12. Central air duct; 13. Spring; 14. Sealing ring; 15. Fixing ring; 16. Sealing cover; 17. Backflush pipe; 18. Spiral cover assembly; 19. Conical cover; 20. Air guide plate; 21. Air inlet pipe; 22. Discharge pipe; 23. Suction hole; 24. Notch. Detailed Implementation

[0026] Example 1

[0027] like Figures 1 to 3 As shown, a pre-filter for a Roots blower and its filter element cleaning device include a vertically arranged enclosed housing 1. A filter cartridge assembly 2 is coaxially arranged within the housing 1. The top end of the filter cartridge assembly 2 is connected to a fixed ring 15 via a flexible sealing ring 14, allowing the filter cartridge assembly 2 to rotate circumferentially at a certain angle. The fixed ring 15 is fixedly connected to the inner wall of the housing 1. A screw cap assembly 18 is fixedly connected to the bottom end of the filter cartridge assembly 2. The surface of the screw cap assembly 18 has a spiral structure. An air inlet pipe 21 is vertically arranged directly below the screw cap assembly 18. The airflow entering through the air inlet pipe 21 blows directly onto the screw cap assembly 18, causing the screw cap assembly 18 to rotate at a certain angle. This, in turn, drives the filter cartridge assembly 2 to rotate at a certain angle, achieving relative dynamic balance during filtration, maintaining a micro-vibration state, and reducing excessive adhesion of fine particles to the filter cartridge assembly 2. More importantly, it can quickly reduce the wind speed of the Roots blower, thus lowering the wind speed in the inlet pipe 21 and reducing the force on the spiral cap assembly 18. Furthermore, due to the rebound effect of the spring assembly, the filter cartridge assembly 2 instantly rotates, generating a stronger swirling vibration that shakes off fine powder particles adhering to it, achieving a preliminary cleaning effect. This significantly reduces the number of backflushing cycles required for the filter cartridge assembly 2, allowing for thorough cleaning only during major equipment overhauls, thus improving overall production efficiency. The inlet pipe 21 is fixedly installed on the housing 1. Above, a discharge pipe 22 is installed at the bottom of the enclosed housing 1. A bottom-closed central air duct 12 is coaxially arranged inside the filter cartridge assembly 2. The top end of the central air duct 12 extends to the outside of the housing 1. Several air suction holes 23 are opened on the outer wall of the central air duct 12. The central air duct 12 is connected to the filter cartridge assembly 2 through a spring plate assembly. A backflush pipe 17 is installed on the central air duct 12. Air valves are installed on both the backflush pipe 17 and the central air duct 12. The backflush pipe 17 is only used during equipment overhaul to thoroughly clean the filter cartridge assembly 2.

[0028] More specifically, such as Figure 3 , Figure 6 and 7 As shown, the filter cartridge unit includes a cylindrical filter screen 3, with annular frames 5 fixedly connected to both the upper and lower ends of the filter screen 3; the spring assembly includes a spring 13, with several positioning blocks 10 connected to the inner wall of the annular frame 5, and insertion slots 11 formed on the positioning blocks 10. The spring 13 is slidably inserted into the insertion slots 11. The spring 13 is made of stainless steel and has a thickness of 0.6 mm; Figure 5As shown, the spiral cap assembly 18 includes a conical cap 19, the diameter of which gradually decreases from top to bottom. Several arc-shaped air guide plates 20 are evenly distributed on the outer circumference of the conical cap 19, and the air guide plates 20 are spirally distributed on the outer circumference of the conical cap 19. To better ensure uniform airflow distribution and reduce wear, the bottom of the conical cap 19 is coated with a wear-resistant coating, and the bottom of the conical cap 19 is hemispherical. Figure 5 As shown, to ensure that the sealing ring 14 has good flexible deformation properties, the sealing ring 14 is made of TPU, and the cross-section of the sealing ring 14 is wavy; as Figure 2 As shown, the bottom surface of the housing 1 is a slope, and the air inlet pipe 21 is located at the lowest end of the housing 1. In order to further improve the sealing performance of the equipment, a sealing cover 16 is fixedly fitted on the central air pipe 12. The bottom end of the sealing cover 16 is fixedly connected to the fixing ring 15. A sealing ring 9 is provided between the sealing cover 16 and the fixing ring 15. The sealing cover 16 is located inside the closed housing 1.

[0029] Example 2

[0030] like Figure 2 , Figure 4 and Figure 7 As shown, in order to achieve quick assembly and disassembly of the filter cartridge assembly 2, Embodiment 2 further discloses the specific structure of the filter cartridge assembly 2 based on Embodiment 1. The filter cartridge assembly 2 includes several filter cartridge units connected in sequence. Any two adjacent filter cartridge units are fixedly connected by a snap fastener 6. To improve sealing, a sealing ring 9 is provided between any two adjacent filter cartridge units. The snap fastener 6 includes a fixing plate 7 fixedly connected to the outer wall of the annular frame 5. A snap connector 8 with a right-angled triangular cross-section is provided at the end of the fixing plate 7. The snap connector 8 snaps onto the adjacent annular frame 5. Several snap connectors are also provided on the annular frame 5 to engage with the snap connector 8. The corresponding notch 24; during specific installation, align the annular frame 5 of one filter cartridge unit with the snap-fit ​​connector 8 of the adjacent filter cartridge unit and gradually move closer. Due to the wedge-shaped structure of the snap-fit ​​connector 8, the snap-fit ​​connector 8 is opened until the sealing ring 9 between the two filter cartridge units is squeezed. At this point, the snap-fit ​​connector 8 returns to its original position and snaps into the annular frame 5 of the adjacent filter cartridge unit, thus completing the installation. When it is necessary to disassemble the filter cartridge unit, rotate the filter cartridge unit forcefully so that the snap-fit ​​connector 8 is located in the notch 24 position of the adjacent filter cartridge unit, thereby releasing the snap-fit ​​of the fastener 6 and completing the disassembly. Disassembly and installation are quick and convenient. During major overhauls, individual filter cartridge units can be replaced according to the specific wear position of the filter cartridge assembly 2, saving costs.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-filter for a Roots blower and its filter element cleaning device, characterized in that: It includes a vertically arranged enclosed housing (1), within which a filter cartridge assembly (2) is coaxially arranged. The top end of the filter cartridge assembly (2) is connected to a fixing ring (15) via a flexible sealing ring (14). The fixing ring (15) is fixedly connected to the inner wall of the housing (1). A screw cap assembly (18) is fixedly connected to the bottom end of the filter cartridge assembly (2). An air inlet pipe (21) is vertically arranged directly below the screw cap assembly (18). The air inlet pipe (21) is fixedly installed on the housing (1). The bottom of the housing (1) is also equipped with a discharge pipe (22). A bottom-closed central air duct (12) is coaxially arranged inside the filter cylinder assembly (2). The top end of the central air duct (12) extends to the outside of the housing (1). Several air suction holes (23) are opened on the outer wall of the central air duct (12). The central air duct (12) is connected to the filter cylinder assembly (2) through a spring plate assembly. A backflush pipe (17) is installed on the central air duct (12). Air valves are installed on both the backflush pipe (17) and the central air duct (12).

2. The pre-filter for a Roots blower and its filter element cleaning device according to claim 1, characterized in that: The filter cartridge assembly (2) includes several filter cartridge units connected in sequence. Any two adjacent filter cartridge units are fixedly connected by a snap fastener (6), and a sealing ring (9) is provided between any two adjacent filter cartridge units.

3. A pre-filter for a Roots blower and its filter element cleaning device according to claim 2, characterized in that: The filter cylinder unit includes a cylindrical filter screen (3), and an annular frame (5) is fixedly connected to both the upper and lower ends of the filter screen (3).

4. A pre-filter for a Roots blower and its filter element cleaning device according to claim 3, characterized in that: The fastener (6) includes a fixing plate (7) fixedly connected to the outer wall of the annular frame (5). At the end of the fixing plate (7), there is a snap connector (8) with a right-angled triangle cross-section. The snap connector (8) snaps onto the adjacent annular frame (5). Several notches (24) adapted to the snap connector (8) are also provided on the annular frame (5).

5. A pre-filter for a Roots blower and its filter element cleaning device according to claim 3, characterized in that: The spring assembly includes a spring (13), and several positioning blocks (10) are connected to the inner wall of the annular frame (5). A insertion groove (11) is provided on the positioning block (10). The spring (13) is slidably inserted into the insertion groove (11). The spring (13) is made of stainless steel and the thickness of the spring (13) is less than 1 mm.

6. A pre-filter for a Roots blower and its filter element cleaning device according to claim 1, characterized in that: The spiral cap assembly (18) includes a conical cap (19) with a diameter that gradually decreases from top to bottom. Several arc-shaped air guide plates (20) are evenly distributed on the outer circumferential surface of the conical cap (19), and the air guide plates (20) are spirally distributed on the outer circumferential surface of the conical cap (19).

7. A pre-filter for a Roots blower and its filter element cleaning device according to claim 6, characterized in that: The bottom of the conical cover (19) is coated with a wear-resistant coating, and the bottom of the conical cover (19) is hemispherical.

8. A pre-filter for a Roots blower and its filter element cleaning device according to claim 1, characterized in that: The sealing ring (14) is made of TPU and has a wavy cross section.

9. A pre-filter for a Roots blower and its filter element cleaning device according to claim 1, characterized in that: The bottom surface of the housing (1) is an inclined surface, and the air inlet pipe (21) is located at the lowest end of the housing (1).

10. A pre-filter for a Roots blower and its filter element cleaning device according to claim 1, characterized in that: A sealing cover (16) is fixedly fitted on the central air duct (12). The bottom end of the sealing cover (16) is fixedly connected to the fixing ring (15). A sealing ring (9) is provided between the sealing cover (16) and the fixing ring (15). The sealing cover (16) is located inside the closed shell (1).

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