Pre-filter

Abstract

The utility model belongs to the technical field of filtering devices, and particularly relates to a pre-filter which comprises a barrel, an air inlet and an air outlet, a sealing cover is arranged at the top of the barrel, a drain outlet is formed in the bottom end of the barrel, a partition plate is arranged in the barrel, a long barrel filter element is arranged on the partition plate, and an assembly through hole allowing the long barrel filter element to be inserted from top to bottom is formed in the partition plate. A fixing support is placed on the partition plate located on the upper side of the assembling through hole, the fixing support and the partition plate are of a split structure and are relatively fixed through a detachable assembly, a fixing stud is arranged on the top end face of the long-cylinder filter element along the axis of the long-cylinder filter element, and the top end of the fixing stud upwards penetrates through the fixing support and is in threaded connection with a fastening nut. The filter is simple in structure, reasonable in design and low in cost, on the basis of an existing structure, a connecting structure of the long-cylinder filter element and the partition plate is designed above the partition plate, so that the situation that dismounting and mounting acting force on the connecting structure is applied to the long-cylinder filter element is avoided, assembly is convenient, and the long-cylinder filter element is not damaged.

Description

Technical fields:

[0001] This utility model belongs to the technical field of filtration devices, and specifically refers to a pre-filter. Background technology:

[0002] A pre-filter disclosed in a Chinese utility model patent (authorization announcement number: CN218357710U) includes a cylindrical body and a filter element. The cylindrical body has an inlet and an outlet on its left and right sides. A partition with a Z-shaped structure is provided inside the cylindrical body. The inlet and outlet are separated by the partition. The partition has at least one mounting hole for installing the filter element. An internal threaded ring is provided at the lower end of the mounting hole. An external threaded seat that mates with the internal threaded ring is provided at the upper end of the filter element. A sealing cap is provided at the upper end of the cylindrical body. A drain port is provided at the lower end of the cylindrical body.

[0003] In this structure, the filter element and the separator are fixed together by an internally threaded ring located at the lower end of the mounting hole and an externally threaded seat located at the upper end of the filter element. Therefore, in terms of structural dimensions, the outer diameter of the externally threaded seat and the inner diameter of the internally threaded ring must be smaller than the inner diameter of the mounting hole to allow for threaded engagement. Consequently, the externally threaded seat needs to be recessed into the mounting hole. However, the clearance between the mounting hole and the filter element is small, and assemblers can only connect or disconnect the externally threaded seat and the internally threaded ring by directly screwing the filter element. This operation can easily damage the filter element, affecting its filtration efficiency and service life. Summary of the Invention:

[0004] The purpose of this utility model is to provide a pre-filter that, based on the existing structure, designs the connection structure between the long cylindrical filter element and the partition plate above the partition plate, thereby avoiding the application of disassembly and assembly forces on the long cylindrical filter element, making assembly convenient and causing no damage to the long cylindrical filter element.

[0005] This utility model is implemented as follows:

[0006] A pre-filter includes a cylindrical body and an air inlet and an air outlet located on the left and right sides of the cylindrical body. The top of the cylindrical body is open and equipped with a sealing cap, and the bottom of the cylindrical body has a drain outlet. A partition separating the air inlet and the air outlet is provided inside the cylindrical body, and a long cylindrical filter element is mounted on the partition. The partition has an assembly through hole for inserting the long cylindrical filter element from top to bottom.

[0007] An extension sleeve is formed by extending the inner wall surface of the assembly through hole upward along its axial direction, and a fixing sleeve is provided at the top of the long cylindrical filter element that can be fixed relative to the extension sleeve axially.

[0008] Alternatively, a fixed bracket may be placed on the partition above the assembly through hole. The fixed bracket and the partition are separate structures and are fixed to each other by a detachable component. A fixing stud is provided on the top surface of the long cylindrical filter element along its axis. The top of the fixing stud passes through the fixed bracket and is screwed with a fastening nut.

[0009] In one of the aforementioned pre-filters, the inner wall of the extension sleeve is provided with an internal thread, and the outer wall of the fixed sleeve is provided with an external thread that mates with the internal thread of the extension sleeve.

[0010] In the aforementioned pre-filter, the fixed bracket includes a fixed base plate and a gantry frame mounted on the fixed base plate. The fixed base plate located directly below the gantry frame has a limiting through hole that is opposite to the position of the assembly through hole and has a smaller diameter than the assembly through hole. The gantry frame has a mating through hole for the fixing stud to pass through. The top surface of the elongated filter element abuts against the bottom surface of the fixed base plate.

[0011] In the aforementioned pre-filter, the fixed bracket has two or more fixed through holes, and the partition plate has fixed screw holes that correspond one-to-one with the fixed through holes. The fastening screws pass through the fixed through holes from top to bottom and are screwed into the corresponding fastening screw holes.

[0012] In the aforementioned pre-filter, the baffle includes a disc portion with a radially inward arc-shaped notch formed by severing, a cleft portion formed by severing the disc portion, and an arc-shaped cut-off portion corresponding to the arc-shaped notch. The disc portion and the cleft portion can form a disc structure with an outer diameter corresponding to the inner diameter of the cylinder. The bottom end of the arc-shaped cut-off portion is welded and fixed to the cut-off surface of the disc portion, and the top end is welded and fixed to the cut-off surface of the cleft portion. The arc-shaped cut-off portion is formed by severing the side wall of a circular tube.

[0013] In one of the aforementioned pre-filters, the bottom of the cylinder is provided with support feet that allow it to stand on the ground.

[0014] The outstanding advantages of this utility model compared to the prior art are:

[0015] This utility model has a simple structure, reasonable design and low cost. Based on the existing structure, the connection structure between the long filter element and the partition is designed above the partition, thereby avoiding the application of disassembly and assembly forces on the long filter element, making assembly convenient and without damaging the long filter element. Attached image description:

[0016] Figure 1 This is a structural cross-sectional schematic diagram of Embodiment 1 of this utility model;

[0017] Figure 2 This is a schematic diagram of the cooperation between the partition and the fixed bracket in Embodiment 1 of this utility model;

[0018] Figure 3 This is a cross-sectional view of the structure of Embodiment 2 of this utility model;

[0019] Figure 4 This is a schematic diagram of the partition structure of Embodiment 2 of this utility model.

[0020] In the diagram: 1. Cylinder body; 2. Air inlet; 3. Air outlet; 4. Sealing cap; 5. Partition plate; 6. Long filter element; 7. Assembly through hole; 8. Extension sleeve; 9. Fixing sleeve; 10. Fixing bracket; 11. Fixing stud; 12. Fastening nut; 13. Fixing base plate; 14. Gantry frame; 15. Limiting through hole; 16. Mating through hole; 17. Fixing through hole; 18. Disc section; 19. Notch section; 20. Arc-shaped cut-off section; 21. Support foot. Detailed implementation method:

[0021] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —4:

[0022] Example 1:

[0023] A pre-filter includes a cylindrical body 1 and an air inlet 2 and an air outlet 3 disposed on the left and right sides of the cylindrical body 1. The top of the cylindrical body 1 is open and is provided with a sealing cap 4. The bottom of the cylindrical body 1 is provided with a drain port. The cylindrical body 1 is provided with a partition 5 separating the air inlet 2 and the air outlet 3. A long cylindrical filter element 6 is disposed on the partition 5. The partition 5 is provided with an assembly through hole 7 for the long cylindrical filter element 6 to be inserted from top to bottom. A fixing bracket 10 is placed on the partition 5 above the assembly through hole 7. The fixing bracket 10 and the partition 5 are separate structures and are fixed to each other by a detachable component. A fixing stud 11 is provided on the top surface of the long cylindrical filter element 6 along its axis. The top of the fixing stud 11 passes through the fixing bracket 10 upward and is screwed with a fastening nut 12.

[0024] This utility model has a simple structure, reasonable design and low cost. Based on the existing structure, the connection structure between the long filter element 6 and the partition plate 5 is designed above the partition plate 5, thereby avoiding the application of disassembly and assembly forces on the long filter element 6, making assembly convenient and without damaging the long filter element 6.

[0025] Furthermore, the specific mating structure between the fixed bracket 10 and the elongated filter element 6 is as follows: the fixed bracket 10 includes a fixed base plate 13 and a gantry frame 14 mounted on the fixed base plate 13. The fixed base plate 13 located directly below the gantry frame 14 has a limiting through hole 15 that is opposite to the mounting through hole 7 and has a smaller diameter than the mounting through hole 7. The gantry frame 14 has a mating through hole 16 for the fixed stud 11 to pass through. The top surface of the elongated filter element 6 abuts against the bottom surface of the fixed base plate 13. In addition to the top surface of the elongated filter element 6 being in contact with the bottom surface of the fixed base plate 13, a sealing ring is also provided between the two to ensure a sealed fit between the elongated filter element 6 and the partition plate 5.

[0026] Furthermore, the fixed bracket 10 can be hinged on one side and locked to the partition 5 on the other side to achieve a detachable fit between it and the partition 5. In this embodiment, the fixed bracket 10 has two or more fixed through holes 17, and the partition 5 has fixed screw holes that correspond one-to-one with the fixed through holes 17. The fastening screw passes through the fixed through hole 17 from top to bottom and is screwed into the corresponding fastening screw hole.

[0027] Furthermore, considering that the partition 5 in the prior art adopts a Z-shaped structure, and the vertical middle part of the Z-shaped partition 5 adopts a straight plate structure to cooperate with the inner ring wall of the cylinder 1, which is prone to leakage, in this embodiment, the partition 5 includes a disc portion 18 with a radially inward arc-shaped notch formed by cutting, a circular notch 19 formed by cutting the disc portion 18, and an arc-shaped cut-off portion 20 corresponding to the arc-shaped notch. The disc portion 18 and the circular notch 19 can form a disc structure with an outer diameter corresponding to the inner diameter of the cylinder 1. The bottom end of the arc-shaped cut-off portion 20 is welded and fixed to the cut-off surface of the disc portion 18, and the top end is welded and fixed to the cut-off surface of the circular notch 19. The arc-shaped cut-off portion 20 is formed by cutting off the side wall of a circular tube. This involves directly cutting off a common steel round pipe on the market to obtain an arc-shaped cut-off section 20, which allows the arc-shaped cut-off section 20 to effectively fit against the inner ring wall of the cylinder 1, and the sealing performance can be guaranteed after it is welded to the inner ring wall of the cylinder 1.

[0028] In addition, existing pre-filters cannot be placed vertically and are mostly placed horizontally on the ground, which not only takes up a lot of space but is also extremely inconvenient to move. Therefore, in this utility model, the bottom of the cylinder 1 is provided with a support foot 21 that can stand on the ground.

[0029] Example 2:

[0030] This embodiment is basically the same in structure as Embodiment 1 above, with the main difference being that: the inner wall of the assembly through hole 7 extends upward along its axial direction to form an extension sleeve 8, and the top end of the long cylindrical filter element 6 is provided with a fixing sleeve 9 that can be axially fixed relative to the extension sleeve 8; furthermore, the inner wall of the extension sleeve 8 is provided with an internal thread, and the outer wall of the fixing sleeve 9 is provided with an external thread that mates with the internal thread of the extension sleeve 8. That is, the fixing sleeve 9 is located at the top end of the long cylindrical filter element 6, and the assembler can directly screw on the fixing sleeve 9 to achieve threaded connection or separation between the fixing sleeve 9 and the extension sleeve 8.

[0031] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A pre-filter, comprising a cylindrical body (1) and an air inlet (2) and an air outlet (3) disposed on the left and right sides of the cylindrical body (1), wherein the top of the cylindrical body (1) is open and is provided with a sealing cap (4), a drain outlet is provided at the bottom of the cylindrical body (1), and a partition (5) is provided inside the cylindrical body (1) to separate the air inlet (2) and the air outlet (3), and a long cylindrical filter element (6) is disposed on the partition (5), characterized in that: The partition plate (5) is provided with an assembly through hole (7) for inserting a long cylindrical filter element (6) from top to bottom. An extension sleeve (8) is formed by extending the inner wall surface of the assembly through hole (7) upward along its axial direction, and a fixing sleeve (9) is provided at the top of the long cylindrical filter element (6) that can be fixed axially relative to the extension sleeve (8). A fixing bracket (10) is placed on the partition (5) located on the upper side of the assembly through hole (7). The fixing bracket (10) and the partition (5) are separate structures and are fixed to each other by a detachable component. A fixing stud (11) is provided on the top surface of the long cylindrical filter element (6) along its axis. The top end of the fixing stud (11) passes through the fixing bracket (10) and is screwed with a fastening nut (12).

2. A pre-filter according to claim 1, characterized in that: The inner wall of the extension sleeve (8) is provided with an internal thread, and the outer wall of the fixing sleeve (9) is provided with an external thread that matches the internal thread of the extension sleeve (8).

3. A pre-filter according to claim 1, characterized in that: The fixed bracket (10) includes a fixed base plate (13) and a gantry frame (14) mounted on the fixed base plate (13). The fixed base plate (13) located directly below the gantry frame (14) has a limiting through hole (15) that is opposite to the mounting through hole (7) and has a smaller diameter than the mounting through hole (7). The gantry frame (14) has a mating through hole (16) for the fixing stud (11) to pass through. The top surface of the long cylindrical filter element (6) abuts against the bottom surface of the fixed base plate (13).

4. A pre-filter according to claim 1 or 3, characterized in that: The fixed bracket (10) has two or more fixed through holes (17), and the partition plate (5) has fixed screw holes that correspond one-to-one with the fixed through holes (17). The fastening screw passes through the fixed through holes (17) from top to bottom and is screwed into the corresponding fastening screw holes.

5. A pre-filter according to claim 1, characterized in that: The partition (5) includes a disc portion (18) formed by cutting off an inwardly radially curved notch, a cleft portion (19) formed by cutting off the disc portion (18), and an arc-shaped cut-off portion (20) corresponding to the curved notch. The disc portion (18) and the cleft portion (19) can form a disc structure with an outer diameter corresponding to the inner diameter of the cylinder (1). The bottom end of the arc-shaped cut-off portion (20) is welded and fixed to the cut surface of the disc portion (18), and the top end is welded and fixed to the cut surface of the cleft portion (19). The arc-shaped cut-off portion (20) is formed by cutting off the side wall of a circular tube.

6. A pre-filter according to claim 1, characterized in that: The bottom of the cylinder (1) is provided with a support foot (21) that can stand on the ground.

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