A new fan unit pre-filter cartridge mounting mechanism

Abstract

This utility model discloses a pre-filter cartridge installation mechanism for a fresh air handling unit, including a fresh air handling unit body. A housing is fixedly connected to the fresh air inlet of the fresh air handling unit body. An outer shell is fixedly connected to one side of the outer surface of the housing. A hook is provided below the outer shell, and a drive hook assembly is hooked onto the hook. A self-locking transmission assembly is installed between the hook and the outer shell. A rotating shaft is fixedly installed at the movable end of the self-locking transmission assembly, and the rotating shaft extends through the inner wall of the outer shell into the interior of the housing, and is rotatably connected to the housing. In this utility model, through the cooperation of the hook and the drive hook assembly, the self-locking transmission assembly drives the rotating shaft to rotate, causing the winding wheel to release the traction rope, and driving the mounting base and its frame to descend smoothly. Operators can complete the replacement of filter screen cartridges and filter cloth cartridges from the ground, without having to climb, significantly reducing the risk of falls and greatly improving the safety and convenience of maintenance.

Description

Technical Field

[0001] This utility model relates to the field of filter installation technology, and in particular to a pre-filter installation mechanism for a fresh air handling unit. Background Technology

[0002] Currently, most fresh air handling units have coarse filters (pre-filters) installed at the indoor and outdoor air inlets to intercept large particulate pollutants (such as dust, catkins, and insects) to protect the subsequent medium and high efficiency filters and the core components inside the unit (such as heat exchangers and fans). However, because the coarse filters are directly exposed to the air inlet with the highest dust content, they clog quickly and require frequent replacement.

[0003] In existing technologies, the coarse filter element is installed at a high position along with the fresh air unit. Replacement requires the use of ladders or climbing equipment, and operators must climb to a height to disassemble and install it. This maintenance method is not only time-consuming and labor-intensive, but also poses a safety hazard of falling from heights. In addition, frequent climbing operations increase maintenance costs and reduce the ease of use of the equipment, causing significant problems, especially for the maintenance of fresh air systems in commercial buildings or high-rise residential buildings.

[0004] Therefore, there is an urgent need for a pre-filtration mechanism that can replace the filter element by ground operation, in order to solve the problem of high-altitude maintenance. Utility Model Content

[0005] This utility model is a pre-filter installation mechanism for fresh air handling units, proposed to overcome the shortcomings of existing technologies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a pre-filter cartridge installation mechanism for a fresh air unit, comprising a fresh air unit body, a housing fixedly connected to the fresh air inlet of the fresh air unit body, an outer shell fixedly connected to one side of the outer surface of the housing, a hook provided below the outer shell, and a drive hook assembly hung on the hook;

[0007] A self-locking transmission assembly is installed between the hook and the outer shell;

[0008] The movable end of the self-locking transmission assembly is fixedly installed with a rotating shaft, which extends through the inner wall of the outer shell into the interior of the shell and is rotatably connected to the shell. Two winding wheels are symmetrically fixedly connected to the outer surface of the rotating shaft, and traction ropes are fixedly wound on the outer surface of the two winding wheels. The bottom of the two traction ropes is fixedly connected to a mounting base.

[0009] Both sides of the mounting base are detachably fixed with frames, and filter screens and filter cloths are fixedly installed in the two frames respectively.

[0010] Furthermore, the drive hook assembly includes a handle, the top of which is fixedly connected to a long hook, which is engaged with a hook. This design allows the operator to remotely control the device from the ground via the handle, and the engagement method between the long hook and the hook ensures stable transmission.

[0011] Furthermore, the self-locking transmission assembly includes a worm gear that penetrates the outer casing and is rotatably connected to it. A worm wheel is meshed with the outer surface of the worm gear, and the worm wheel is fixedly connected to the rotating shaft. The worm gear transmission structure not only provides a reliable reduction ratio, making the filter element lifting process smoother, but also has a self-locking function to prevent the filter element assembly from accidentally sliding down under wind or vibration, thereby improving the safety of equipment operation.

[0012] Furthermore, the mounting base includes a base plate, which is attached to the bottom of the housing. A U-shaped seat is fixedly connected to the top of the base plate, and the U-shaped seat is fixedly connected to two traction ropes. The U-shaped seat is fixedly connected to two frames by bolts. The bolts fixing the frames facilitate the quick disassembly and assembly of the filter element, improving maintenance efficiency.

[0013] Furthermore, the top of the U-shaped seat adopts a trapezoidal design. The trapezoidal design provides a guiding function when the U-shaped seat enters the housing, which facilitates the U-shaped seat entering the housing.

[0014] Furthermore, sealing rings are fixedly connected to both sides of the outer surface of the U-shaped seat, and the sealing rings are in sealing contact with the shell. The sealing rings are made of aging-resistant rubber material, which can maintain good elasticity even after long-term use.

[0015] Furthermore, the air inlet of the housing is fixedly connected to a connecting pipe, and the filter screen is located on one side of the connecting pipe. The filter screen is arranged close to the connecting pipe, which can preferentially intercept large particulate pollutants and reduce the burden on the subsequent filter cloth.

[0016] The beneficial effects of this utility model are:

[0017] In use, this utility model discloses a pre-filter installation mechanism for a fresh air handling unit. Through the cooperation of a hook and a drive hook assembly, a self-locking transmission component drives the rotating shaft to rotate, causing the winding wheel to release the traction rope and smoothly lower the mounting base and its frame. Operators can complete the replacement of filter screens and filter cloths from the ground, eliminating the need for climbing, significantly reducing the risk of falls, and greatly improving the safety and convenience of maintenance.

[0018] In use, this utility model discloses a pre-filter installation mechanism for a fresh air handling unit. By mounting a screen filter and a cloth filter side-by-side on the same mounting base, a two-stage pre-filtration structure is formed. The screen filter prioritizes intercepting large particles (such as insects and leaves), while the cloth filter adsorbs fine dust. Their combined operation extends the overall clogging cycle. Compared to traditional single-filter designs, this design distributes the pollutant load, increasing the effective service life after a single maintenance, reducing replacement frequency, and thus decreasing the labor and time costs associated with frequent maintenance. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 : A perspective view of this utility model;

[0021] Figure 2 The present utility model Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 : A cross-sectional view of the outer shell of this utility model;

[0023] Figure 4 : A cross-sectional view of the shell of this utility model.

[0024] The attached figures are labeled as follows:

[0025] 1. Main body of the fresh air unit; 2. Handle; 3. Housing; 4. Connecting pipe; 5. Base plate; 6. Worm gear; 7. Outer shell; 8. Hook; 9. Long hook; 10. Worm gear; 11. Winding reel; 12. Shaft; 13. Traction rope; 14. Recessed seat; 16. Filter screen and filter element; 17. Filter cloth and filter element; 18. Frame. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1 to 4As shown, a pre-filter installation mechanism for a fresh air handling unit is disclosed, comprising a fresh air handling unit body 1, a housing 3 fixedly connected to the fresh air inlet of the fresh air handling unit body 1, an outer shell 7 fixedly connected to one side of the outer surface of the housing 3, a hook 8 provided below the outer shell 7, a drive hook assembly attached to the hook 8, the drive hook assembly including a handle 2, a long hook 9 fixedly connected to the top of the handle 2, and the long hook 9 being attached to the hook 8, the handle 2 being injection molded from engineering plastic (ABS), with anti-slip texture on the surface, and its grip diameter conforming to ergonomics, the long hook 9 and the hook 8 being both made of 304 stainless steel rod.

[0028] A self-locking transmission assembly is installed between the hook 8 and the outer casing 7. A rotating shaft 12 is fixedly installed at the movable end of the self-locking transmission assembly. The self-locking transmission assembly includes a worm gear 6, which passes through the outer casing 7 and is rotatably connected to it. A worm wheel 10 is meshed with the outer surface of the worm gear 6, and the worm wheel 10 is fixedly connected to the rotating shaft 12. A rubber sleeve is fixedly fitted on the shaft surface of the worm gear 6 and is fixedly connected to the outer casing 7. The elastic deformation of the rubber sleeve provides constant frictional resistance, effectively suppressing the transmission of vibration during equipment operation and preventing the filter element from shifting due to accidental rotation of the worm wheel 10. Furthermore, this solution uses a combination of a single-headed worm gear and a worm wheel with a large helix angle to ensure a sufficiently large transmission ratio, so that the reverse driving torque cannot overcome the static friction, thereby preventing the filter element assembly from accidentally sliding down due to wind or vibration.

[0029] The rotating shaft 12 extends through the inner wall of the outer shell 7 into the interior of the shell 3 and is rotatably connected to the shell 3. Two winding wheels 11 are symmetrically fixedly connected to the outer surface of the rotating shaft 12. A traction rope 13 is fixedly wound on the outer surface of both winding wheels 11. The bottom of the two traction ropes 13 is fixedly connected to a mounting base. The traction rope 13 is made of stainless steel wire rope with an outer polyurethane sheath, which has good tensile strength and strong weather resistance.

[0030] The mounting base has frames 18 that can be detachably fixed on both sides. Filter screen element 16 and filter cloth element 17 are fixedly installed in the two frames 18 respectively. The mounting base includes a base plate 5, which is attached to the bottom of the housing 3. A U-shaped seat 14 is fixedly connected to the top of the base plate 5, and the U-shaped seat 14 is fixedly connected to two traction ropes 13. The U-shaped seat 14 is fixedly connected to the two frames 18 by bolts. The top of the U-shaped seat 14 adopts a trapezoidal design. Sealing rings are fixedly connected to both sides of the outer surface of the U-shaped seat 14, and the sealing rings are in sealing contact with the housing 3. The frames 18 and the U-shaped seat 14 are connected by M6 stainless steel hex bolts. The bolt heads are equipped with anti-loosening snap rings to ensure that they remain tight even in high-frequency vibration environments.

[0031] The air inlet of the housing 3 is fixedly connected to the connecting pipe 4, and the filter screen and filter element 16 are located on one side of the connecting pipe 4.

[0032] Working Principle: When the pre-filter cartridge needs to be replaced or maintained, the operator pulls the handle 2 from the ground, which drives the long hook 9 to move the hook 8. This, in turn, drives the rotating shaft 12 to rotate through the self-locking transmission assembly (worm gear 6 and worm wheel 10 meshing). This causes the two take-up wheels 11 to release the traction rope 13 simultaneously. The mounting base (base plate 5 and return seat 14) and the filter screen cartridge 16 and filter cloth cartridge 17 mounted on it descend smoothly to the operating height under gravity. After replacing the cartridge, the worm gear 6 is rotated in the opposite direction, which drives the rotating shaft 12 to rotate in the opposite direction through the worm wheel 10. The take-up wheels 11 tighten the traction rope 13, raising the mounting base to a preset position inside the housing 3. At this time, the trapezoidal structure at the top of the return seat 14 and the sealing ring 15 ensure a tight fit with the housing 3, forming a sealed air duct. The self-locking characteristic of the worm wheel 10 and worm gear 6 mechanism prevents the cartridge structure from accidentally falling off under airflow impact, ensuring operational stability. Throughout the process, operators can replace the filter element without climbing, and the dual filter element structure effectively extends the maintenance cycle through graded filtration.

[0033] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A pre-filter cartridge installation mechanism for a fresh air handling unit, comprising a fresh air handling unit body (1), characterized in that: The fresh air inlet of the main body (1) of the fresh air unit is fixedly connected to the housing (3), and the outer shell (7) is fixedly connected to one side of the outer surface of the housing (3). A hook (8) is provided below the outer shell (7), and a drive hook assembly is hung on the hook (8). A self-locking transmission assembly is installed between the hook (8) and the outer shell (7); The movable end of the self-locking transmission assembly is fixedly installed with a rotating shaft (12), and the rotating shaft (12) extends through the inner wall of the outer shell (7) to the interior of the shell (3) and is rotatably connected to the shell (3). Two winding wheels (11) are symmetrically fixedly connected to the outer surface of the rotating shaft (12), and traction ropes (13) are fixedly wound on the outer surface of the two winding wheels (11). The bottom of the two traction ropes (13) is fixedly connected to a mounting base. The mounting base has frames (18) that can be detachably fixed on both sides, and filter screen element (16) and filter cloth element (17) are fixedly installed in the two frames (18) respectively.

2. The pre-filter cartridge installation mechanism for a fresh air handling unit according to claim 1, characterized in that: The drive hook assembly includes a handle (2), the top of which is fixedly connected to a long hook (9), and the long hook (9) is hooked to a hook (8).

3. The pre-filter cartridge installation mechanism for a fresh air handling unit according to claim 1, characterized in that: The self-locking transmission assembly includes a worm (6), which passes through the outer shell (7) and is rotatably connected to the outer shell (7). A worm wheel (10) is meshed with the outer surface of the worm (6), and the worm wheel (10) is fixedly connected to the rotating shaft (12).

4. The pre-filter cartridge installation mechanism for a fresh air handling unit according to claim 1, characterized in that: The mounting base includes a base plate (5) and the base plate (5) is attached to the bottom of the housing (3). A spiral seat (14) is fixedly connected to the top of the base plate (5) and the spiral seat (14) is fixedly connected to two traction ropes (13). The spiral seat (14) is fixedly connected to two frames (18) by bolts.

5. The pre-filter cartridge installation mechanism for a fresh air handling unit according to claim 4, characterized in that: The top of the U-shaped seat (14) is designed in a trapezoidal shape.

6. The pre-filter cartridge installation mechanism for a fresh air handling unit according to claim 5, characterized in that: Both sides of the outer surface of the recessed seat (14) are fixedly connected with sealing rings, and the sealing rings are in sealing contact with the housing (3).

7. The pre-filter cartridge installation mechanism for a fresh air handling unit according to claim 1, characterized in that: The air inlet of the housing (3) is fixedly connected to the connecting pipe (4), and the filter screen (16) is located on one side of the connecting pipe (4).

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