Diffusion type fan filter unit

Abstract

The utility model discloses a diffusion type fan filter unit which is characterized in that a machine shell is provided with a laminar flow air guide seat and two diffusion modules, the laminar flow air guide seat is provided with a circular air collecting cavity and two laminar flow cavity channels, and air inlets of the two laminar flow cavity channels are connected to the two opposite sides of the air collecting cavity respectively; each diffusion module is located outside an air outlet of the corresponding laminar flow cavity channel and comprises an air return baffle and a flow guide baffle, the flow guide baffle is located on the side, away from the laminar flow cavity channel, of the air return baffle, the center of the air return baffle is bent away from the laminar flow cavity channel, and a plurality of sawtooth-shaped first vortex control empennages are arranged at the bottom of the air return baffle; the centrifugal fan is rotationally connected to the laminar flow air guide seat, and the rotating axis of the centrifugal fan coincides with the circle center axis of the air collection cavity; the filtering assembly comprises a filtering material body and a frame, and the frame is detachably connected to the machine shell. The energy utilization rate is high, the operation energy consumption is low, the utilization rate of the filter material body is high, the filtering effect is reliable, and the mute performance is high.

Description

Technical Field

[0001] This utility model relates to the field of filter units, and in particular to a diffusion fan filter unit. Background Technology

[0002] In cleanrooms, laboratories, and electronics manufacturing, fan filter units are widely used to provide stable and uniform airflow to meet high cleanliness requirements. A fan filter unit integrates a fan and a filter into a single unit, typically installed by hanging or embedding it in the ceiling.

[0003] In traditional technology, fan filter units typically use axial flow fans to directly drive airflow through the filter in the unit for output. This direct-blowing output structure can easily lead to excessively high or low local flow velocities, which not only affects filtration efficiency but also shortens the filter's lifespan. In addition, high-speed airflow generates significant noise, affecting workers' hearing health. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a diffusion-type fan filter unit that features high filtration efficiency, long service life, low operating noise, and low energy loss.

[0005] A diffusion-type fan filter unit according to an embodiment of the present utility model includes:

[0006] The housing is equipped with a laminar flow guide seat and two sets of diffusion modules. The laminar flow guide seat has a circular air collection cavity and two laminar flow channels. The air inlets of the two laminar flow channels are respectively connected to the opposite sides of the air collection cavity. Each diffusion module is located outside the air outlet of the corresponding laminar flow channel. The diffusion module includes a return air baffle and a flow guide baffle. The flow guide baffle is located on the side of the return air baffle away from the laminar flow channel. The center of the return air baffle is curved into a C shape away from the laminar flow channel. The flow guide baffle is inclined away from the laminar flow channel from top to bottom. The top of the flow guide baffle is located above the top of the return air baffle. The bottom of the return air baffle is located below the laminar flow guide seat. The bottom of the return air baffle is provided with several serrated first vortex control tail fins.

[0007] A centrifugal fan is rotatably connected to a laminar flow guide seat, and the rotation axis of the centrifugal fan coincides with the central axis of the air collection chamber;

[0008] The filter assembly includes a filter media body and a frame. The filter media body is connected to the frame and is located below the laminar flow guide seat and the diffusion module. The frame is detachably connected to the housing.

[0009] In this embodiment, the diffusion module also includes a flow divider located between the return air baffle and the flow guide baffle, the flow divider being inclined from top to bottom towards the laminar flow channel.

[0010] In this embodiment, the bottom of the diversion baffle is provided with several second vortex-controlled tail fins in a sawtooth shape.

[0011] In this embodiment, the return air baffle is provided with a first buffer layer connecting the housing at both ends, the flow guide baffle is provided with a second buffer layer connecting the housing at both ends, and the diversion baffle is provided with a third buffer layer connecting the housing at both ends.

[0012] In this embodiment, the bottom of the laminar flow guide seat is provided with two air regulating plates. Each air regulating plate is connected to the air outlet of the corresponding laminar flow channel. Each air regulating plate is inclined from top to bottom away from the corresponding return air baffle.

[0013] In this embodiment, the bottom of the housing is provided with a first positioning frame, the first positioning frame is provided with a first positioning hole, the bottom of the frame is provided with a second positioning frame located below the first positioning frame, the second positioning frame is provided with a second positioning hole that matches the first positioning hole, and locking positioning components are provided in the first positioning hole and the second positioning hole.

[0014] In this embodiment, the top of the second positioning frame is provided with a fourth buffer layer that abuts against the first positioning frame.

[0015] In this embodiment, a limiting frame is provided inside the housing at the top of the frame.

[0016] In this embodiment, the top of the frame is provided with a fifth buffer layer that abuts against the limiting frame.

[0017] The embodiments of this utility model have at least the following beneficial effects:

[0018] By using a centrifugal fan and a circular air collection chamber in a coaxial layout, the airflow output by the centrifugal fan maintains a smooth tangential contact with the chamber wall, forming a low-impact inflow guide that effectively reduces energy loss. The symmetrical laminar flow channels can effectively adapt to the airflow direction of the centrifugal fan, further reducing energy loss. This filtration unit has high energy utilization and low operating energy consumption. The detachable filter structure facilitates maintenance and effectively extends the overall service life of the filtration unit, resulting in low operating costs. The C-shaped return air baffle effectively redirects the airflow at a large angle to the central area of ​​the filter media body. Furthermore, the coordinated inclined baffles can guide the airflow to the edge area of ​​the filter media body more smoothly and with low loss. The airflow is diffused and directed to different output areas, which can effectively improve the uniformity of airflow distribution above the filter media body. The filter media body has a high effective utilization rate, reliable filtration effect, and long service life. In addition, the serrated first vortex-controlled tail fin can destroy the vortex of the airflow after a large angle turn. This not only reduces noise through sound wave phase cancellation and has high quiet performance, but also reduces resonance caused by airflow impact, resulting in high aerodynamic load balance and strong stability of the operating structure. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a three-dimensional structural diagram of the diffusion fan filter unit according to an embodiment of the present utility model;

[0021] Figure 2 This is a three-dimensional structural diagram of the diffusion fan filter unit according to another perspective of an embodiment of the present utility model.

[0022] Figure 3 This is a top view of the diffuser fan filter unit according to an embodiment of the utility model.

[0023] Figure 4 For along Figure 3 A schematic diagram of the cross-sectional structure of line A-A';

[0024] Figure 5 This is an exploded structural diagram of a diffusion fan filter unit according to an embodiment of the utility model.

[0025] Figure 6 This is an exploded structural diagram of the diffusion fan filter unit according to an embodiment of the utility model from another perspective.

[0026] Figure label:

[0027] Casing 100, laminar flow guide seat 110, air collection cavity 111, laminar flow channel 112, air regulating plate 113, return air baffle 120, first vortex-controlled tail fin 121, first buffer layer 122, flow guide baffle 130, second buffer layer 131, flow diversion baffle 140, second vortex-controlled tail fin 141, third buffer layer 142, first positioning frame 150, first positioning hole 151, limit frame 160;

[0028] Centrifugal fan 200;

[0029] The filter assembly 300, filter media body 310, frame 320, second positioning frame 330, second positioning hole 331, fourth buffer layer 332, locking positioning component 340, and fifth buffer layer 350. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, left, right, front, and back, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0032] In the description of this utility model, if the wire sleeve or bracket is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0033] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] Fan filter units are widely used to provide stable and uniform airflow to meet high cleanliness requirements. A fan filter unit integrates a fan and a filter into a single unit, typically installed by hanging or embedding in the ceiling.

[0035] In traditional technologies, fan-driven filtration units typically use axial fans to directly drive airflow through the filter within the unit. This direct-flow structure easily leads to excessively high or low local flow velocities, affecting filtration efficiency and shortening filter lifespan. Furthermore, the high-speed airflow generates significant noise, impacting workers' hearing. Some technologies use centrifugal fans to drive the airflow, guiding it through the inner wall of the casing before it exits through a bottom filter. However, this structure causes significant impact between the high-speed airflow and the casing's inner wall, resulting in substantial noise generation, polluting the working environment. The direct collision between the airflow and the casing also leads to significant pressure loss and severe energy depletion.

[0036] The following is for reference only. Figure 1 To be continued Figure 6 The present invention describes a diffuser fan filter unit with high filtration efficiency, long service life, low operating noise, and low energy loss.

[0037] Reference Figures 1 to 6 A diffusion-type fan filter unit according to an embodiment of the present invention includes:

[0038] The housing 100 has an exhaust port and an exhaust port, with the exhaust port located below the exhaust port. Inside the housing 100 are a laminar flow guide seat 110 and two sets of diffusion modules. The laminar flow guide seat 110 has a circularly projected air collecting cavity 111 and two laminar flow channels 112. The air collecting cavity 111 is a three-dimensional cylindrical shape. The air collecting cavity 111 and the two laminar flow channels 112 are all formed around the housing 100 by the laminar flow guide seat 110. The two laminar flow channels 112 are rotationally symmetrical about the central axis of the air collecting cavity 111. The air inlets of the two laminar flow channels 112 are respectively connected to the corresponding air inlets of the air collecting cavity 111. On both sides, each laminar flow channel 112 is connected to the circumferential edge of the air collection cavity 111. Each diffusion module is located outside the air outlet of the corresponding laminar flow channel 112. For each diffusion module, the diffusion module includes a return air baffle 120 and a guide baffle 130. The guide baffle 130 is located on the side of the return air baffle 120 away from the laminar flow channel 112. The center of the return air baffle 120 is bent into a C-shape towards the side away from the laminar flow channel 112. The guide baffle 130 is inclined from top to bottom towards the side away from the laminar flow channel 112 and projected along the central axis of the airflow output of the laminar flow channel 112. The projection of the air outlet of the laminar flow channel 112 intersects with the projection of the return air baffle 120, and the projection of the air outlet of the laminar flow channel 112 intersects with the projection of the guide baffle 130. The horizontal plane where the top of the guide baffle 130 is located is above the horizontal plane where the top of the return air baffle 120 is located, the horizontal plane where the bottom of the return air baffle 120 is located is below the bottom surface of the laminar flow guide seat 110, and the horizontal plane where the top of the return air baffle 120 is located is above the bottom surface of the laminar flow guide seat 110. The return air baffle 120 is used to rotate the airflow by more than 120 degrees and output it downwards from the laminar flow guide seat 110. The bottom of 120 is provided with several serrated first vortex-controlled tail fins 121. Along the curvature of the return air baffle 120, the cross-sectional area of ​​the first vortex-controlled tail fins 121 gradually decreases. The first vortex-controlled tail fins 121, which adopt biomimetic design, can interfere with the formation of vortices and optimize the phase delivery of sound waves, thereby reducing noise and balancing aerodynamic performance. By avoiding resonance, the service life of the return air baffle 120 can be effectively improved, and energy loss can be effectively reduced. It can also effectively improve the airflow guidance and dispersion efficiency. In the direction of airflow, the first vortex-controlled tail fins 121 can be set as isosceles triangles.

[0039] Centrifugal fan 200 is rotatably connected to laminar flow guide seat 110. The rotation axis of centrifugal fan 200 coincides with the central axis of air collection chamber 111. The center of centrifugal fan 200 is connected to the air outlet. The circumferential surface of centrifugal fan 200 faces air collection chamber 111. Centrifugal fan 200 is used to pump air from the air outlet to air collection chamber 111 and output it through the corresponding laminar flow channel 112.

[0040] The filter assembly 300 is located at the air outlet. The filter assembly 300 includes a filter media body 310 and a frame 320. The filter media body 310 is connected to the frame 320 and is located below the laminar flow guide seat 110 and the diffusion module. The frame 320 is detachably connected to the housing 100. When the filter media module reaches the end of its service life, it can be easily replaced. The filter media body 310 is a corrugated folded filter cotton.

[0041] By using a centrifugal fan 200 and a circular air collecting chamber 111 in a coaxial layout, the airflow output by the centrifugal fan 200 maintains a smooth tangential contact with the cavity wall of the air collecting chamber 111, forming a low-impact inflow guide that effectively reduces energy loss. The cylindrical three-dimensional structure of the air collecting chamber 111 and the circumferential surface of the centrifugal fan 200 form an equal-gap flow channel, allowing the airflow to smoothly transition from radial flow to laminar flow channel 112 with minimal disturbance, reducing kinetic energy loss caused by vortex generation. The rotationally symmetrical laminar flow channel 112 can effectively adapt to the air delivery direction of the centrifugal fan 200, thereby further reducing energy loss. This filter unit has high energy utilization, low operating energy consumption, and a detachable filter structure for easy maintenance, effectively extending the overall service life of the filter unit and reducing operating costs. The C-shaped return air baffle 120 effectively redirects the airflow at a large angle to the central area of ​​the filter media body 310, and coordinates with the tilting... The guide baffle 130 can guide the airflow to the edge area of ​​the filter media body 310 more smoothly and with low loss. The airflow is diffused and directed to different output areas, which can effectively improve the uniformity of the airflow distribution above the filter media body 310. The filter media body 310 has high utilization rate, reliable filtration effect, and can avoid local overload of the filter media body 310. The filter media body 310 has a long service life. The laminar flow channel 112 and the corresponding structure of the diffusion module are designed to intersect, so that the airflow mixes naturally during the diffusion process, reducing turbulence and improving the airflow guidance accuracy. In addition, the serrated first vortex control tail 121 can destroy the vortex shedding of the airflow after a large angle turn. It can not only reduce noise through sound wave phase cancellation, but also has high quiet performance, which is particularly suitable for the laboratory and other scenarios with harsh noise restrictions. It can also reduce the resonance caused by airflow impact, have high aerodynamic load balance, and strong stability of the operating structure.

[0042] Understandably, the diffusion module also includes a diversion baffle 140 located between the return air baffle 120 and the guide baffle 130. The diversion baffle 140 is inclined from top to bottom near the laminar flow channel 112 so that some airflow can reach below the return air baffle 120, thereby improving the airflow diffusion and diversion effect inside the housing 100. The uniform flow effect is good, which can not only effectively improve the utilization rate of the filter media body 310, but also improve the gentleness of the air output.

[0043] The diffusion module can achieve a three-level distribution diffusion effect. In actual operation, about 40 to 60% of the airflow is directly turned at a large angle through the return air baffle 120 and output towards the filter media body 310. The remaining airflow is guided by the guide baffle 130 and then output. Part of the airflow guided by the guide baffle 130 is also diverted by the diversion baffle 140, thereby improving the uniformity of airflow distribution.

[0044] Understandably, the bottom of the flow divider 140 is provided with several serrated second vortex-controlled tail fins 141. Along the inclined extension direction of the flow divider 140, the cross-sectional area of ​​the second vortex-controlled tail fins 141 gradually decreases. The biomimetic design of the second vortex-controlled tail fins 141 can interfere with the formation of vortices and optimize the acoustic phase delivery, thereby reducing noise and balancing aerodynamic performance. By avoiding resonance, the service life of the flow divider 140 can be effectively improved, and energy loss can be effectively reduced. It can also effectively improve the airflow guidance and dispersion efficiency. In the direction of airflow, the second vortex-controlled tail fins 141 can be set as isosceles triangles.

[0045] Understandably, for each diffusion module, the return air baffle 120 has a first buffer layer 122 connecting to the housing 100 at both ends, the flow guide baffle 130 has a second buffer layer 131 connecting to the housing 100 at both ends, and the diversion baffle 140 has a third buffer layer 142 connecting to the housing 100 at both ends. The first buffer layer 122, the second buffer layer 131, and the third buffer layer 142 can all be configured as layers of sound-absorbing cotton, foamed cotton, aluminum foam, etc.

[0046] The first buffer layer 122 connects the return air baffle 120 and the housing 100, the second buffer layer 131 connects the flow guide baffle 130 and the housing 100, and the third buffer layer 142 connects the flow diversion baffle 140 and the housing 100. This effectively improves the stability of the relative position between the diffuser module and the housing 100. Each buffer layer can effectively absorb the vibration force generated by the airflow compression of the diffuser module, further improving the overall quietness of the unit and extending the overall service life of the unit.

[0047] It is understood that the bottom of the laminar flow guide seat 110 is provided with two air regulating plates 113. Each air regulating plate 113 is connected to the air outlet of the corresponding laminar flow channel 112. Each air regulating plate 113 is inclined from top to bottom away from the corresponding nearest return air baffle 120, and the horizontal plane where the bottom of the air regulating plate 113 is located is above the horizontal plane where the bottom of the return air baffle 120 is located. The air regulating plate 113 can form a downward pressure on the airflow that is turned and output by the return air baffle 120, so that some of the airflow can form a downward movement trend towards the filter material body 310 after being output from the return air baffle 120, thereby effectively improving the uniformity of airflow diffusion and separation, and effectively and significantly improving the effect of uniform airflow.

[0048] Understandably, the bottom of the housing 100 is provided with a first positioning frame 150, which has a first positioning hole 151. The bottom of the frame 320 is provided with a second positioning frame 330 located below the first positioning frame 150, which has a second positioning hole 331 that matches the first positioning hole 151. A locking positioning element 340 is provided in both the first positioning hole 151 and the second positioning hole 331. The locking positioning element 340 can be a screw. By setting both the first positioning hole 151 and the second positioning hole 331 to be screw holes, a screw can be used to lock and position the first positioning frame 150 and the second positioning frame 330, thereby enabling the filter assembly 300 to be installed in the housing 100. The locking positioning element 340 can be provided to improve the stability of the positioning.

[0049] Understandably, the top of the second positioning frame 330 is provided with a fourth buffer layer 332 that abuts against the bottom surface of the first positioning frame 150, and the locking positioning component 340 is also inserted through the fourth buffer layer 332. The fourth buffer layer 332 can effectively absorb the vibration force generated by the airflow through the second positioning frame 330, which can further improve the overall quiet performance of the unit and extend the overall service life of the unit. The fourth buffer layer 332 can be set as a layer structure of sound insulation cotton, foam cotton, foam aluminum, etc.

[0050] It is understandable that the housing 100 is provided with a limiting frame 160 located at the top of the frame 320. The limiting frame 160 can further restrict the position of the filter component 300, thereby effectively improving the stability of the relative position between the filter component 300 and the housing 100 during operation.

[0051] Understandably, the top of the frame 320 is provided with a fifth buffer layer 350 that abuts against the bottom surface of the limiting frame 160. The fifth buffer layer 350 can effectively absorb the vibration force generated by the airflow through the frame 320, which can further improve the overall quietness performance of the unit and extend the overall service life of the unit. The fifth buffer layer 350 can be set as a layer structure of sound insulation cotton, foam cotton, foam aluminum, etc.

[0052] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A diffusion-type fan filter unit, characterized in that, include: The housing (100) is provided with a laminar flow guide seat (110) and two sets of diffusion modules. The laminar flow guide seat (110) is provided with a circular air collecting chamber (111) and two laminar flow channels (112). The air inlets of the two laminar flow channels (112) are respectively connected to the opposite sides of the air collecting chamber (111). Each diffusion module is located outside the air outlet of the corresponding laminar flow channel (112). The diffusion module includes a return air baffle (120) and a flow guide baffle (130). The flow guide baffle (130) is located at the return air baffle (111). 20) On the side away from the laminar flow channel (112), the center of the return air baffle (120) is curved into a C-shape away from the laminar flow channel (112), the guide baffle (130) is inclined away from the laminar flow channel (112) from top to bottom, the top of the guide baffle (130) is located above the top of the return air baffle (120), the bottom of the return air baffle (120) is located below the laminar flow guide seat (110), and the bottom of the return air baffle (120) is provided with a plurality of serrated first vortex control tail fins (121); A centrifugal fan (200) is rotatably connected to the laminar flow guide seat (110), and the rotation axis of the centrifugal fan (200) coincides with the central axis of the air collection chamber (111). The filter assembly (300) includes a filter media body (310) and a frame (320). The filter media body (310) is connected to the frame (320). The filter media body (310) is located below the laminar flow guide seat (110) and the diffusion module. The frame (320) is detachably connected to the housing (100).

2. The diffusion-type fan filter unit according to claim 1, characterized in that, The diffusion module also includes a flow divider (140) located between the return air baffle (120) and the flow guide baffle (130), the flow divider (140) being inclined from top to bottom toward the laminar flow channel (112).

3. A diffusion-type fan filter unit according to claim 2, characterized in that, The bottom of the diversion baffle (140) is provided with several serrated second vortex-controlled tail fins (141).

4. A diffusion-type fan filter unit according to claim 3, characterized in that, The return air baffle (120) has a first buffer layer (122) connecting to the housing (100) at both ends, the flow guide baffle (130) has a second buffer layer (131) connecting to the housing (100) at both ends, and the diversion baffle (140) has a third buffer layer (142) connecting to the housing (100) at both ends.

5. A diffusion-type fan filter unit according to claim 1, characterized in that, The bottom of the laminar flow guide seat (110) is provided with two air regulating plates (113). Each air regulating plate (113) is connected to the air outlet of the corresponding laminar flow channel (112). Each air regulating plate (113) is inclined from top to bottom away from the corresponding return air baffle (120).

6. A diffusion-type fan filter unit according to claim 1, characterized in that, The bottom of the housing (100) is provided with a first positioning frame (150), the first positioning frame (150) is provided with a first positioning hole (151), the bottom of the frame (320) is provided with a second positioning frame (330) located below the first positioning frame (150), the second positioning frame (330) is provided with a second positioning hole (331) matching the first positioning hole (151), and locking positioning elements (340) are provided in the first positioning hole (151) and the second positioning hole (331).

7. A diffusion-type fan filter unit according to claim 6, characterized in that, The top of the second positioning frame (330) is provided with a fourth buffer layer (332) that abuts against the first positioning frame (150).

8. A diffusion-type fan filter unit according to claim 1, characterized in that, The housing (100) is provided with a limiting frame (160) located at the top of the frame (320).

9. A diffusion-type fan filter unit according to claim 8, characterized in that, The top of the frame (320) is provided with a fifth buffer layer (350) that abuts against the limiting frame (160).

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