CN220303861U - Fine filtering mechanism - Google Patents

Abstract

The utility model relates to a fine filtering mechanism, and belongs to the technical field of fresh air systems. The fine filtering mechanism comprises a housing and two filtering pieces, wherein an access hole is formed in one side of the housing, a plurality of clamping pieces are arranged in the housing, the clamping pieces are provided with mounting sliding grooves, and two ends of each filtering piece are respectively and slidably inserted into the mounting sliding grooves; along the air inlet direction, two filter elements are arranged in a "<" shape. According to the fine filtering mechanism provided by the utility model, the housing is used for forming a relatively closed interval so that air flow can flow along a specified direction, the filtering pieces are used for filtering impurities in the air flow, the two ends of the filtering pieces are inserted into the mounting grooves of the clamping pieces, so that the fine filtering mechanism is convenient to assemble and disassemble, the two filtering pieces are distributed in a shape of '<', the area of the filtering pieces can be increased, the impurities can be better filtered, and the direction of the air flow and the surface of the filtering pieces are arranged in an included angle, so that direct blowing can be avoided, and the generation of turbulent flow can be effectively prevented.

Description

Fine filtering mechanism

Technical Field

The utility model belongs to the technical field of fresh air systems, and particularly relates to a fine filtering mechanism.

Background

In large shops, large fresh air systems are often used, which typically comprise several functional modules, such as coarse filtration units, fine filtration units, fan units, sterilization units, etc.

In combination with the patent CN201510697403.0 entitled "fresh air heat recovery integrated machine" and the patent CN202020424740.9 entitled "self-cleaning fresh air device of filter screen", in the fine filtration unit, a filter plate is usually installed, the filter plate is usually in a monolithic structure, and the direction of air intake is perpendicular to the filter plate, so that the area of the filter plate is limited, and is the same as the size of the shell at most, and turbulence may be formed due to the air flow blowing through the filter plate.

Disclosure of Invention

In view of the above, the present utility model aims to provide a fine filtering mechanism, which can increase the area of a filtering piece, filter impurities better, and prevent direct blowing due to the arrangement of an included angle between the direction of air flow and the surface of the filtering piece, so as to prevent turbulent flow effectively.

The technical scheme of the utility model is as follows:

the utility model provides a fine filtering mechanism which comprises a housing and two filtering pieces, wherein an access hole is formed in one side of the housing, a plurality of clamping pieces are arranged in the housing, each clamping piece is provided with a mounting chute, and two ends of each filtering piece are respectively and slidably inserted into the mounting chute; along the air inlet direction, the two filtering pieces are arranged in a "<" shape.

As an alternative of the above technical solution, the engaging member includes a first engaging member and two second engaging members, the first engaging member is disposed in the middle of the housing, the two second engaging members are disposed at the top and bottom ends of the housing, respectively, and each of the filter members is slidably inserted into and engaged with the first engaging member and one of the second engaging members, respectively.

As an alternative scheme of the technical scheme, a plurality of rollers are arranged in the installation chute, the rollers are rotatably matched with the clamping piece, and the rollers are in rolling contact with the filtering piece.

As an alternative scheme of the technical scheme, the installation sliding grooves corresponding to the two ends of the filter element are respectively a first sliding groove and a second sliding groove, the first sliding grooves are positioned above the second sliding grooves, the two sides of the first sliding grooves are respectively provided with a compensation sliding groove, a compensation sliding block and a compensation spring are embedded in the compensation sliding grooves in a sliding manner, one end of the roller is connected with the sliding block, and the compensation spring enables the compensation sliding block to have a trend of outwards moving.

As an alternative to the above technical solution, the access opening is closed by a closing plate, and a strip-shaped notch for taking out the filter element is provided on the access opening.

As an alternative scheme of the technical scheme, one side of the filter element is provided with the drawing component, the drawing component comprises a handle and a resetting element, the filter element is provided with the drawing groove, the handle is embedded in the drawing groove and hinged with the filter element, and the resetting element enables the handle to have a resetting trend completely.

As an alternative to the above-mentioned technical solution, the handle includes a first end and a second end, the first end is closer to the hinge portion than the second end, the reset element is disposed at the second end and fixes the second end and the filter element through magnetic adsorption, and when the first end is pressed, the second end can be separated from the filter element and is exposed from the drawing slot.

As an alternative of the above technical solution, the housing includes a casing and a first access door, the first access door includes a door frame and a second access door, the door frame is hinged with the casing, the second access door is hinged in the door frame, and an opening direction of the first access door is opposite to an opening direction of the second access door.

As an alternative to the above-mentioned technical solution, the rotation center lines of the first access door and the second access door each extend vertically, the first access door has a first hinged end and a first movable end, the second access door has a second hinged end and a second movable end, the first hinged end is adjacent to the second movable end, and the first movable end is adjacent to the second hinged end.

As an alternative to the above technical solution, the filtering mechanism further includes two groups of ultraviolet lamp sets, and the two groups of ultraviolet lamp sets are independently disposed at the top and bottom ends in the housing and extend toward the middle.

The beneficial effects of the utility model are as follows:

according to the fine filtering mechanism provided by the utility model, the housing is used for forming a relatively closed interval so that air flow can flow along a specified direction, the filtering pieces are used for filtering impurities in the air flow, the two ends of the filtering pieces are inserted into the mounting grooves of the clamping pieces, so that the fine filtering mechanism is convenient to assemble and disassemble, the two filtering pieces are distributed in a shape of '<', the area of the filtering pieces can be increased, the impurities can be better filtered, and the direction of the air flow and the surface of the filtering pieces are arranged in an included angle, so that direct blowing can be avoided, and the generation of turbulent flow can be effectively prevented.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. The above and other objects, features and advantages of the present utility model will become more apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the several views of the drawings. The drawings are not intended to be drawn to scale, with emphasis instead being placed upon illustrating the principles of the utility model.

Fig. 1 is a schematic structural diagram of a fine filtering mechanism according to a first embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a fine filtering mechanism according to a first embodiment of the present utility model;

fig. 3 is a schematic structural diagram III of a fine filtering mechanism according to a first embodiment of the present utility model;

FIG. 4 is a schematic view of a fine filtration mechanism (with the closing plate removed) according to a first embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a clamping member of the fine filtering mechanism according to the first embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a clamping member of a fine filtering mechanism according to a second embodiment of the present utility model;

FIG. 7 is a schematic diagram of a filter element and a structure of a fine filter mechanism according to a second embodiment of the present utility model;

FIG. 8 is a partial cross-sectional view I of FIG. 7;

FIG. 9 is a partial cross-sectional view II of FIG. 7;

fig. 10 is a schematic structural view of a housing of a fine filtering mechanism according to a third embodiment of the present utility model.

Icon: 10-a fine filtering mechanism; 11-a housing; 12-a filter; 14-ultraviolet lamp groups; 110-a housing; 111-a first access door; 112-door frame; 113-a second access door; 114-closing plate; 120-clamping piece; 121-mounting a chute; 122-roller; 123-compensating sliding grooves; 124-compensating slide block; 125-compensating springs; 126-a drawer assembly; 127-handle; 128-reset member.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Example 1

Referring to fig. 1-5, a first embodiment of the present utility model provides a fine filtering mechanism 10, wherein the fine filtering mechanism 10 is used as a part of a fresh air system to filter impurities in air flow, so that air is cleaner.

The fine filtering mechanism 10 mainly comprises a housing 11, an engaging member 120 and a filtering member 12, wherein the two filtering members 12 are arranged in the housing 11.

The housing 11 is used for forming a relatively closed interval, two ends of the housing 11 are respectively provided with an air inlet and an air outlet, and air flow can enter the housing 11 from the air inlet and flow out from the air outlet.

The cross-sectional shape of the housing 11 is not limited, and in the present embodiment, the housing 11 is substantially rectangular parallelepiped, and the housing 11 includes a housing 110 and a first access door 111.

One side of the housing 110 has an access hole, and the interior of the housing 110 can communicate with the outside through the access hole, so that a worker can repair, replace, etc. the internal components through the access hole.

The first access door 111 is provided at the access opening, the first access door 111 is hinged with the housing 110, and the first access door 111 is rotatable to have an open state and a closed state: when the first access door 111 is in an open state, the access opening is exposed; when the first access door 111 is in the closed state, the access opening is completely closed by the first access door 111, preventing air flow from exiting the access opening.

The first access door 111 has a first hinge end and a first movable end, the first hinge end being hinged with the housing 110, a rotation center line of the first hinge end and the housing 110 extending vertically, and the first movable end being capable of being moved closer to or away from the housing 110 when the first access door 111 is rotated.

The number of the engaging members 120 is not limited, for example, three, four, etc., in this embodiment, the number of the engaging members 120 is three, and the three engaging members 120 are a first engaging member 120 and two second engaging members 120, respectively, and the engaging members 120 are perpendicular to the air flow direction. The three clamping pieces 120 are distributed in a triangle shape, the first clamping piece 120 is arranged in the middle of the inner side of the housing 11, one second clamping piece 120 is arranged at the top end of the inner side of the housing 11, and the other second clamping piece 120 is arranged at the bottom end of the inner side of the housing 11.

Each clamping member 120 is provided with a mounting chute 121, in this embodiment, the upper and lower sides of the first clamping member 120 are provided with first mounting chutes 121, the second clamping member 120 is provided with second mounting chutes 121, and the first mounting chutes 121 are in one-to-one correspondence with the second mounting chutes 121 and are oppositely arranged.

The structure of the filter element 12 may refer to the prior art, for example, air filter cotton may be used, and the cross section of the filter element 12 may be rectangular. Both ends of each filter element 12 are respectively slidably inserted into the mounting sliding grooves 121, that is, one end of each filter element 12 is inserted into the first mounting sliding groove 121, and the other end is inserted into the second mounting sliding groove 121. The filter element 12 can slide along the mounting chute 121 to insert the filter element 12 into a designated position or withdraw it from within the mounting chute 121.

Along the air intake direction, the two filter elements 12 are arranged in a "<" shape. One side of the filter element 12 is disposed at an angle to the direction of the air flow, the filter element 12 is inclined with respect to the vertical plane of the direction of the air flow, and the angle between the two can be adjusted, in general, the larger the inclination angle of the filter element 12 is, the larger the area of the filter element 12 is.

The filter elements 12 are inclined such that the surface of the filter element 12 increases and the two filter elements 12 separate the cavities in the housing 110, the airflow needs to be filtered through the filter elements 12, the greater the surface area of the filter elements 12, the better the filtering effect and the lower the frequency of replacement of the filter elements 12. In addition, because the filter element 12 is inclined, the air flow does not blow straight through the filter element 12, and turbulence is not easily formed.

In addition, in this embodiment, still be provided with the closing plate 114 on the casing 110, the closing plate 114 is used for sealing the access hole, can ensure that the air current can not follow the access hole and flow, strengthens the leakproofness, sets up the bar breach on the access hole, and the bar breach is rectangular that rectangular shape wholly is, and after filter 12 inserted in the installation spout 121, can follow the bar breach and take out, need not to dismantle the closing plate 114, easy operation is convenient.

In addition, in the prior art, the fresh air system generally further comprises an ultraviolet sterilization assembly, and the ultraviolet sterilization assembly generally comprises a housing 11 and an ultraviolet lamp tube, wherein two ends of the ultraviolet lamp tube are required to be respectively fixed with the housing 11 in a plugging manner. As is well known, the ultraviolet lamp tube is very fragile, in the fresh air system, because the fan is required to enable air to flow, when the fan works, vibration can be generated, the vibration can be transmitted to the housing 11 of the sterilization and disinfection box, the housing 11 of the fresh air system used in a market is large in size, vibration displacement amounts of the upper end and the lower end of the housing 11 are not completely consistent, and a shearing force can be applied to the ultraviolet lamp tube, so that the ultraviolet lamp tube has the possibility of fracture. Therefore, in the present embodiment, the following improvement scheme is provided: the filtering mechanism further comprises two groups of ultraviolet lamp groups 14, and the two groups of ultraviolet lamp groups 14 are independently arranged at the top end and the bottom end in the housing 11 and extend towards the middle.

Specifically, the two ultraviolet lamp groups 14 are respectively disposed at the upper and lower sides in the housing 11, each ultraviolet lamp group 14 includes at least two ultraviolet lamps, in this embodiment, each ultraviolet lamp group 14 includes three ultraviolet lamps, one end of each ultraviolet lamp is fixedly connected with the top end or the bottom end of the housing 11, the other end extends towards the middle and is suspended, and the ultraviolet lamp connected with the top end of the housing 11 and the ultraviolet lamp connected with the bottom end of the housing 11 are mutually independent.

By the arrangement, the length of the ultraviolet lamp tube can be effectively reduced, and the shorter the ultraviolet lamp tube is, the less easily broken is, whereas the longer the ultraviolet lamp tube is, the more easily broken is, as is known. In addition, because one end of the ultraviolet lamp tube is fixed and the other end is suspended, when the housing 11 vibrates, the housing 11 can drive the ultraviolet lamp tube to integrally shake through the fixed end of the ultraviolet lamp tube, the suspended end of the ultraviolet lamp tube is not applied with acting force, the ultraviolet lamp tube cannot be subjected to shearing force, and the ultraviolet lamp tube can be effectively prevented from being broken.

In other embodiments, the ultraviolet lamp set 14 may not be provided.

Example two

The second embodiment of the present utility model provides a fine filter mechanism 10, which is further improved on the basis of the first embodiment, and the improvement is mainly that the connection manner of the filter element 12 and the clamping element 120 is the connection manner, and other parts which are not mentioned can refer to the first embodiment or the prior art.

When the filter element 12 is inserted into the installation chute 121, the filter element 12 is in sliding contact with the installation chute 121, so that the resistance is high and a certain friction damage exists. In this embodiment, the following schemes may be employed, but are not limited to: referring to fig. 6, a plurality of rollers 122 are disposed in the installation chute 121, and the number of rollers 122 can be set according to needs, for example, two, three, four, etc., and the plurality of rollers 122 are distributed at intervals along the length direction of the installation chute 121.

The roller 122 comprises a rotating shaft and a rotating drum, wherein two ends of the rotating shaft are respectively connected and fixed with the clamping piece 120, the rotating drum is sleeved on the rotating shaft, the rotating shaft and the rotating drum are coaxially arranged, and the rotating drum can rotate around the rotating shaft.

The roller 122 is in rolling contact with the filter element 12 to reduce friction between the roller 122 and the filter element 12.

Specifically, the installation sliding grooves 121 corresponding to the two ends of the filter element 12 are a first sliding groove and a second sliding groove, the first sliding groove is located above the second sliding groove, the rollers 122 can be arranged in the first sliding groove and the second sliding groove, and the rollers 122 can be arranged in the second sliding groove.

When the distance between the first chute and the second chute is fixed, if the width of the filter element 12 is slightly smaller than the distance, the filter element 12 may shake, and if the width of the filter element 12 is slightly larger than the distance, the filter element 12 may not be inserted. In some embodiments, the above-described problem can be ameliorated by the following technical solutions: the two sides of the first sliding groove are respectively provided with a compensation sliding groove 123, the compensation sliding grooves 123 can extend along the depth direction of the first sliding groove, the compensation sliding grooves 123 are embedded with compensation sliding blocks 124, the compensation sliding blocks 124 can slide along the compensation sliding grooves 123, so that the compensation sliding blocks 124 can be close to or far away from the opening of the first sliding groove, and the compensation sliding blocks 124 can be close to or far away from the bottom surface of the first sliding groove. One end of the roller 122 is connected with the sliding block, the roller 122 can slide along with the sliding block, and the distance between the roller 122 in the first sliding groove and the roller 122 in the second sliding groove can be adjusted, so that the filter element 12 with different sizes can be adapted, and the roller 122 in the first sliding groove and the roller 122 in the second sliding groove can tightly clamp the filter element 12.

The compensation sliding groove 123 may further include a compensation spring 125, where the compensation spring 125 may be a compression spring or a tension spring, and in this embodiment, the compensation spring 125 adopts a compression spring, two ends of the compensation spring 125 are respectively abutted against the compensation sliding groove 123 and the compensation sliding block 124, and the compensation spring 125 makes the compensation sliding block 124 have a tendency to move outwards, even if the distance between the roller 122 in the first sliding groove and the roller 122 in the second sliding groove is reduced.

If the closing plate 114 is provided at the access opening or another solution is adopted, it may be difficult to take out the filter element 12, because if the closing plate 114 is provided at the access opening, the exposed portion of the filter element 12 has only one side plane of the filter element 12 after the filter element 12 is inserted into the installation chute 121, and it is difficult for a worker to grasp and draw out the filter element 12. Thus, in some embodiments, the following schemes may be employed, but are not limited to: referring to fig. 7-9, a pull assembly 126 is provided on one side of the filter element 12, and the pull assembly 126 includes a handle 127 and a reset element 128.

The filter element 12 is provided with a drawing groove, the handle 127 is embedded in the drawing groove, and the shape of the handle 127 can be matched with that of the drawing groove, for example, the section of the handle 127 and the section of the drawing groove are rectangular. The handle 127 is hinged to the filter element 12, and the hinge shaft of the handle and the filter element can extend along the width direction of the drawing slot, and the hinge manner can refer to the prior art. In this embodiment, the handle 127 includes a first end and a second end, the first end being closer to the hinge than the second end, and the second end being capable of disengaging the filter element 12 and being exposed from the draw slot when the first end is depressed.

The reset piece 128 makes the handle 127 have a reset trend completely, the reset piece 128 can adopt a spring, a torsion spring, a magnet and the like, if the reset piece 128 adopts the torsion spring, the torsion spring is sleeved on the hinge shaft of the handle 127 and the filter piece 12, and two ends of the torsion spring are respectively abutted with the handle 127 and the filter piece 12. In this embodiment, the reset element 128 may be a magnetic absorbent element, and the reset element 128 includes a first absorbent element and a second absorbent element, where the first absorbent element and the second absorbent element are magnets, or the first absorbent element is a magnet and the second absorbent element is a metal, or the first absorbent element is a metal and the second absorbent element is a magnet. The first adsorption element is fixed in the second end and the second adsorption element is located the pull inslot, and when the second end embedding pull inslot, the second end can adsorb with filter 12, prevents the improper perk of second end.

Example III

Referring to fig. 1, a third embodiment of the present utility model provides a fine filtering mechanism 10, where the fine filtering mechanism 10 is further improved on the basis of the first embodiment or the second embodiment, and the improvement is mainly that the structure of the first access door 111, and other parts not mentioned can be referred to the first embodiment or the second embodiment or the prior art.

The fine filter mechanism 10 is generally located in a housing, and it is known that the space inside the housing and outside the housing 11 is small, and it is generally only necessary to open the access door of the housing 11, and if the opening direction of the access door is fixed, particularly the access door located at both ends, the left access door must be opened to the left, and the right access door must be opened to the right, which requires that the installation portions of the access door and the housing 110 be preset, and the different inner housing 11 units are different in structure. In addition, when two adjacent access doors are required to be serviced, the orientation of the access doors may also obstruct the service of the personnel.

Therefore, in the present embodiment, the following improvement scheme is provided: as shown in connection with fig. 10, the first access door 111 includes a door frame 112 and a second access door 113.

The door frame 112 is not limited in shape, for example, the door frame 112 may have a rectangular frame structure, and the outer periphery of the door frame 112 is matched with the size of the access opening, which is a first opening, and the door frame 112 is a second opening. The door frame 112 is hinged with the housing 110, and the second access door 113 is hinged within the door frame 112, the first access door 111 opening in a direction opposite to the second access door 113 opening.

The second access door 113 is vertically disposed with respect to a rotation center line of the door frame 112, and the second port can be opened or closed during rotation of the second access door 113. When the second access door 113 is opened, the second port is exposed, and a worker can access the filter 12 and the like inside; when the second access door 113 is closed, the second port is closed, causing the housing 11 to form a relatively closed space, allowing gas to flow, preventing air leakage or foreign substances from entering the interior of the housing 11. In short, in both the first port and the second port, the internal functional unit can be inspected as long as either one is opened.

The second access door 113 has a second hinged end and a second movable end, the first hinged end being adjacent the second movable end, the first movable end being adjacent the second hinged end. The door frame 112 is provided with a first hinge end hinged with the housing 110, and a first movable end about which the first access door 111 can be rotated to open or close the first port. A first locking unit is disposed between the first movable end and the housing 110, and the structure of the first locking unit is not limited, and may refer to the prior art, as long as the first movable end and the housing 110 can be fixed and unlocked, for example, the first locking unit may adopt a quick lock, a mechanical lock, and the like. The second hinge end is hinged with the door frame 112, and the second access door 113 can be rotated about the second hinge end to open or close the second port. A second locking unit is disposed between the second movable end and the door frame 112, and the structure of the second locking unit is not limited, and may refer to the prior art, as long as the second movable end and the door frame 112 can be fixed and unlocked, for example, the second locking unit may adopt a quick lock, a mechanical lock, or the like.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (9)

1. The fine filtering mechanism is characterized by comprising a housing and two filtering pieces, wherein an access hole is formed in one side of the housing, a plurality of clamping pieces are arranged in the housing, each clamping piece is provided with a mounting chute, and two ends of each filtering piece are respectively and slidably inserted into the mounting chute; along the air inlet direction, the two filtering pieces are arranged in a shape of "<";

the installation chute is internally provided with a plurality of rollers, the rollers are rotatably matched with the clamping piece, and the rollers are in rolling contact with the filtering piece.

2. The fine filtration mechanism of claim 1, wherein the engaging member comprises a first engaging member and two second engaging members, the first engaging member is disposed in a middle portion of the housing, the two second engaging members are disposed at a top end and a bottom end of the housing, respectively, and each of the filter members is slidably inserted into engagement with the first engaging member and one of the second engaging members, respectively.

3. The fine filtering mechanism according to claim 1, wherein the mounting sliding grooves corresponding to two ends of the filtering piece are a first sliding groove and a second sliding groove respectively, the first sliding groove is located obliquely above the second sliding groove, compensating sliding grooves are formed in two sides of the first sliding groove, a compensating sliding block and a compensating spring are embedded in the compensating sliding grooves in a sliding mode, one end of the roller is connected with the sliding block, and the compensating spring enables the compensating sliding block to have a tendency of moving outwards.

4. The fine filtration mechanism of claim 1, wherein the access opening is closed by a closing plate, and a strip-shaped notch for removing the filter element is provided in the access opening.

5. The fine filtration mechanism of claim 1, wherein a pull assembly is provided on one side of the filter element, the pull assembly comprising a handle and a reset element, the filter element being provided with a pull slot, the handle being embedded in the pull slot and hinged to the filter element, the reset element causing the handle to have a tendency to reset entirely.

6. The fine filter mechanism of claim 5, wherein the handle comprises a first end and a second end, the first end being closer to the hinge than the second end, the reset element being disposed at the second end and holding the second end and the filter element together by magnetic attraction, the second end being capable of being disengaged from the filter element and exposed from the draw slot when the first end is depressed.

7. The fine filter mechanism of any one of claims 1-6, wherein the housing comprises a shell and a first access door, the first access door comprising a door frame and a second access door, the door frame being hinged to the shell, the second access door being hinged within the door frame, the first access door opening in a direction opposite to the second access door opening.

8. The fine filter mechanism of claim 7, wherein the center lines of rotation of the first access door and the second access door each extend vertically, the first access door having a first hinged end and a first movable end, the second access door having a second hinged end and a second movable end, the first hinged end being adjacent the second movable end, the first movable end being adjacent the second hinged end.

9. The fine filter mechanism of any one of claims 1-6, further comprising two sets of ultraviolet light sets, the two sets of ultraviolet light sets being independently disposed at a top end and a bottom end within the housing and each extending toward the middle.