CN214619967U - Air supply unit of fan filter unit - Google Patents

Abstract

The utility model discloses a fan filter unit's air supply unit. The air supply unit includes: the box body comprises a top plate and an air inlet which vertically penetrates through the top plate; a fan comprising an impeller mounted above the top plate; the volute is arranged above the top plate, a volute air cavity containing the impeller is defined by the volute, and the top of the volute is provided with a suction inlet; the air guide ring is positioned between the volute and the impeller so as to conduct an air inlet of the fan and the suction inlet; the guide structure is arranged at the air inlet and limits an air channel communicated with the volute air cavity, and the air channel is provided with a centrifugal air outlet positioned below the top plate; at the centrifugal air outlet, the air duct extends outwards away from the central axis of the impeller to guide the airflow to flow outwards away from the central axis. The utility model provides an air supply unit through the optimal design of structure, has solved the cost problem, can also guarantee wind speed homogeneity.

Description

Air supply unit of fan filter unit

Technical Field

The utility model relates to a fan filter unit's air supply unit belongs to air filter technical field.

Background

The Fan Filter Unit is a modularized tail end air supply device with a filtering effect, and is called a Fan Filter Unit (FFU) for short in English. The fan filter unit sucks air from the top, and then filters through the filter, and the clean air after the filtration evenly sends out at certain speed at whole air-out face. The fan filter unit is widely applied to application occasions such as clean rooms, clean workbenches, clean production lines, assembled clean rooms and local hundred-level rooms, can improve the cleanliness level, reduce noise and vibration, greatly reduce the manufacturing cost, is convenient to install and maintain, and is ideal equipment for clean environment.

The existing fan filter unit is composed of a filter 3 and an air supply unit, wherein the air supply unit mainly comprises a box body 1, a fan 2 and a controller 4 for controlling the start and stop of the fan 2, the specific structure of the fan filter unit is relatively mature through the technological evolution for many years, and the design of each brand is different. As shown in fig. 1 to 3, a substantially conventional box 1 is generally configured as a rectangular member with an open bottom, and a top plate 11 of the box 1 is centrally provided with an air inlet 10 with a protective mesh enclosure 5; the inside of box 1 sets up median septum 12, and median septum 12 passes through supporting beam 13 fixed equipment on the frame of box 1, and fixed mounting has wind-guiding circle 7, fan 2, fan unable adjustment base 9, fan spiral case 8 and flow straightener isotructure between median septum 12 and roof 11. When the fan filter unit operates, as shown by arrows in fig. 3, external air flows into the inside of the box body 1 from the air inlet 10 after passing through the protective mesh enclosure 5, then leaves the impeller of the fan 4 and flows along the inner wall 80 of the fan volute 8, and then flows downwards through the filter 3 from the channel T between the two sides of the middle partition plate 12 and the frame of the box body 1.

However, the existing structure of the fan filter unit has the following defects:

firstly, in order to realize air supply and ensure uniform air speed of the whole air outlet surface, components such as a fan 2, an air guide ring 7, a fan fixing base 9, a middle partition plate 12, a fan volute 8, a flow equalizing device and the like need to be arranged in a box body 1, and the box body 1 is large in size and various in components, so that the whole weight of a fan filter unit is large, and the material cost is high;

secondly, the fan filter unit is mounted on the suspended ceiling manually on a construction site, and the transportation cost and the mounting cost are high when the fan filter unit is mounted on the suspended ceiling due to the fact that the weight of the whole fan filter unit is large;

thirdly, in the aspect of the wind speed uniformity of the whole air outlet surface, the design of the existing structure is limited, the wind speed uniformity of the existing fan filter unit is basically maintained at the standard reaching level, and the further improvement space is smaller.

Disclosure of Invention

An object of the utility model is to provide a fan filter unit's air supply unit to solve fan filter unit's among the prior art problem with high costs, and can guarantee the wind speed homogeneity.

In order to realize the above object of the present invention, an embodiment provides an air supply unit of a fan filter unit, including:

the box body comprises a top plate and an air inlet which vertically penetrates through the top plate;

a fan comprising an impeller mounted above the top plate;

the volute is arranged above the top plate, a volute air cavity containing the impeller is defined by the volute, and the top of the volute is provided with a suction inlet;

the air guide ring is positioned between the volute and the impeller so as to conduct an air inlet of the fan and the suction inlet; and the number of the first and second groups,

the flow guide structure is arranged at the air inlet and limits an air channel communicated with the volute air cavity, and the air channel is provided with a centrifugal air outlet positioned below the top plate; at the centrifugal air outlet, the air duct extends outwards away from the central axis of the impeller to guide the airflow to flow outwards away from the central axis.

As a further improvement to an embodiment, the flow guide structure includes a bottom flow guide wall defining a lower boundary of the air duct; at the centrifugal air outlet, the bottom flow guide wall is arranged to be horizontal or obliquely upward so that the airflow leaves the centrifugal air outlet horizontally or obliquely upward.

As a further improvement of an embodiment, the air duct is also provided with a centripetal air outlet positioned below the top plate; at the centripetal air outlet, the air duct is opened inwards towards the central axis to guide the airflow to flow inwards towards the central axis.

As a further improvement of an embodiment, the flow guide structures are arranged on the upper side and the lower side of the top plate; the air duct intersects with the volute air cavity at the side of the impeller and extends outwards to the centrifugal air outlet in an inclined mode.

As a further improvement of an embodiment, the flow guide structure has:

an outer guide wall defining an outer boundary of the air duct and extending from an inner wall surface of the volute about the central axis in an outward curve;

a top guide wall defining an upper boundary of the air duct, connecting the outer side guide wall and an inner wall surface of the scroll casing, and extending obliquely downward around the central axis; and the number of the first and second groups,

and the inner side flow guide wall is used for limiting the inner boundary of the air channel, is positioned below the top plate and surrounds the centrifugal air outlet with the outer side flow guide wall and the bottom flow guide wall.

As a further improvement of an embodiment, the flow guiding structure further comprises a partition wall, the air duct is divided into a centrifugal air duct with the centrifugal air outlet and a centripetal air duct with the centripetal air outlet by the partition wall, and the centrifugal air duct and the centripetal air duct are independent from each other.

As a further improvement of an embodiment, the partition wall protrudes inward from the outer guide wall and is located between the top guide wall and the bottom guide wall; the centripetal air outlet is formed between the inner edge of the partition wall and the inner edge of the bottom flow guide wall.

As a further improvement of an embodiment, the number of the flow guide structures is two, three, four or more, and all the flow guide structures are arranged in the same structure and are uniformly arranged around the central axis.

As a further improvement of an embodiment, the air supply unit further includes air deflectors fixed below the top plate, the air deflectors radially extend on opposite sides of the central axis and protrude downward from the top plate to a bottom end of the air deflector that is not higher than a bottom end of the centrifugal air outlet.

As a further improvement of an embodiment, the fan is a centrifugal fan including a motor for driving the blades of the impeller to rotate around the central axis;

the top plate further has:

the mounting channel is communicated up and down and is used for mounting the motor into the box body from top to bottom; and the number of the first and second groups,

the air guide plate is arranged on the installation channel and is fixedly connected with the two reinforcing ribs, and the motor is supported on the air guide plate.

Compared with the prior art, the utility model discloses an embodiment has following beneficial effect: on one hand, the impeller, the volute and the air guide ring are arranged above the top plate, and the box body does not need to be set to be large in size for accommodating the impeller, the air guide ring, the volute and other structures, so that the height of the box body is greatly reduced, and the material cost and the weight of the box body are reduced; the number and the weight of the required structural members are greatly reduced, so that the material cost, the transportation cost and the installation cost of the whole machine are greatly reduced, the cost is obviously reduced, and the economic benefit is great; on the other hand, the wind speed uniformity is ensured by the arrangement of the flow guide structure while the cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a prior art fan filter assembly;

FIG. 2 is a schematic diagram of an internal structure of an air supply unit of a conventional fan filter unit;

FIG. 3 is an exploded view of a blower unit of a prior art fan filter assembly;

fig. 4 is a schematic structural diagram of a fan filter unit according to an embodiment of the present invention;

fig. 5 is a schematic view of a lower side view of the air supply unit according to embodiment 1 of the present invention;

fig. 6a is an exploded view of the air supply unit according to embodiment 1 of the present invention;

fig. 6b is another exploded view of the air supply unit according to embodiment 1 of the present invention;

fig. 7 is a bottom view of the air supply unit according to embodiment 1 of the present invention;

FIG. 8 is a sectional view taken along line A-A of FIG. 7;

fig. 9 is a schematic structural view of an air supply unit according to embodiment 2 of the present invention;

fig. 10 is a schematic view of a lower side view of an air supply unit according to embodiment 2 of the present invention;

fig. 11a is an exploded view of the air supply unit according to embodiment 2 of the present invention;

fig. 11b is another exploded view of the air supply unit according to embodiment 2 of the present invention;

fig. 12 is a perspective view of a volute diversion mechanism of a blower according to embodiment 2 of the present invention;

FIG. 13a is a partially exploded view of a volute diversion mechanism of the blower of FIG. 12;

FIG. 13b is a further partially exploded view of the volute diversion mechanism of the blower of FIG. 12;

fig. 14 is a perspective view of a partial structure of an air supply unit according to embodiment 2 of the present invention;

fig. 15 is a bottom view of the air blowing unit according to embodiment 2 of the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. However, these examples are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these examples are intended to be within the scope of the present invention.

Referring to FIG. 4, a fan filter pack 100 is illustrated. The fan filter unit 100 includes an air supply unit including a case 1 and a fan 2 assembled on the case 1, and a filter 3.

The box body 1 comprises a horizontally arranged rectangular top plate 11, a vertically arranged rectangular cylindrical side plate 12 and an air inlet 110 which vertically penetrates through the top plate 11, wherein the top plate 11 is positioned at the top of the side plate 12, and the top plate and the side plate can be integrally formed through a sheet metal bending process; the top plate 11 and the side plates 12 enclose an inner cavity 10 of the box body 1, and the bottom of the inner cavity 10 is in an open design. And the filter 3 can be fixedly arranged below the box body 1 under the limit guidance of the filter baffle 30, and the filter 3 is in sealed butt joint with the inner cavity 10 of the box body 1. In this way, when the fan filter assembly 100 is in operation, under the action of the fan 2, the air flow can enter the inner cavity 10 of the box 1 from the air inlet 110, and finally, when the air flow leaves the inner cavity 10 downwards, the air flow must pass through the filter 3 to obtain effective filtering and purification.

As the background art provides, based on air supply unit's structural design, there is the cost at present traditional fan filter unit and is high scheduling problem, to this, the utility model provides an air supply unit, through the optimal design of structure, fine solution cost problem to can also further guarantee the wind speed homogeneity.

The specific structure of the air supply unit and the advantageous effects thereof according to the present invention will be described in detail with reference to the following embodiments.

Example 1

An embodiment of the air supply unit will be described in detail below with reference to fig. 4 and fig. 5 to 8.

As described above, the air supply unit includes the casing 1 and the fan 2, and in the present embodiment, referring to fig. 6a and 6b, the fan 2 includes the motor 22 and the impeller 21. The impeller 21 is mounted above the top plate 11 and has a central axis O (see fig. 7), and specifically includes a plurality of blades 211, a curved upper cover plate 212 located above the blades 211, and a planar lower cover plate 213 located below the blades 211; the lower cover plate 213 is also positioned above the top plate 11; the blades 211 can rotate around the central axis O under the driving of the motor 22, so as to drive the air flow to form the air flow of the air supply unit; the inner edge 2120 of the upper cover plate 212 encloses an inlet 20, and when the blades 211 rotate, airflow can flow from the inlet 20 to the blades 211.

The air supply unit further comprises a volute diversion mechanism for guiding the airflow formed by the fan 2. Referring to fig. 4 to 6b, the volute diversion mechanism specifically includes a volute 5, a wind guiding ring 55, and a diversion structure 7.

Wherein the volute 5 is mounted above the top plate 11 and encloses a volute wind chamber 50, and the volute wind chamber 50 accommodates the impeller 21 therein; and, the top of the volute 5 is provided with a suction inlet, and the wind guide ring 55 is positioned between the volute 5 and the impeller 21 to communicate the suction inlet with the air inlet 20 of the fan 2. Thus, when the fan 2 is turned on, the external air above the volute 5 passes through the suction inlet downwards along with the rotation of the blade 211, and then flows from the suction inlet to the air inlet 20 of the fan 2 under the guidance of the air guiding ring 55, and then flows along the surface of the blade 211 until leaving the blade 211 and flowing in the volute air cavity 50.

Thus, compared with the prior art, in the embodiment, the impeller 21, the volute 5 and the wind guiding ring 55 are arranged above the top plate 1, and the box body 1 does not need to be arranged into a larger volume for accommodating the impeller 21, the wind guiding ring 55, the volute 5 and other structures, so that the height of the box body 1 is greatly reduced, and the material cost and the weight of the box body 1 are reduced; moreover, the impeller 21, the volute 5 and the like are directly supported on the top plate 11, and a middle partition plate 12, a fan fixing base 9 and the like in the figures 1-3 can be omitted in the inner cavity 10 of the box body 1 compared with the prior art, so that the material cost and the weight are further reduced; in addition, due to the reduction of the weight, the transportation cost and the installation cost required when the fan filter unit 100 is installed on the suspended ceiling through the handle 6 are correspondingly reduced. That is, overall, adopt the air supply unit of this embodiment, have the advantage that can greatly reduced fan filter unit's cost.

Also, in the present application, the flow guiding structure 7 is disposed at the air inlet 110 for guiding the flow of the air flow.

In particular, the flow guiding structure 7 defines an air duct 70. The air duct 70 is communicated with the volute air chamber 50, and has a centrifugal air outlet 701 located below the top plate 11, that is, the centrifugal air outlet 701 is formed in the inner cavity 10 of the box body 1. Thus, when the fan 2 is turned on, the airflow in the volute chamber 50 can flow into the air duct 70 and flow in the inner chamber 10 after leaving the air duct 70 through the centrifugal outlet 701.

At the centrifugal outlet 701, the air duct 70 extends in an outward direction away from the central axis O. As such, referring to fig. 7, at the centrifugal air outlet 701, the air flow f1 exits the air duct 70 substantially outwardly away from the central axis O under the guidance of the flow guiding structure 7. Like this, through the setting to water conservancy diversion structure 7, can realize the control of air supply direction, combine aforementioned fan 2, spiral case 5, wind-guiding circle 55's setting, not only can realize the reduction of cost, but also can make and satisfy the basic requirement to the wind speed homogeneity in the trade under the low-cost condition, avoid leading to the not up to standard condition of wind speed homogeneity to take place because reduce cost.

Specifically, the volute 5 includes a top shell 51 that substantially covers over the impeller 21 and a surrounding wall 52 that surrounds the impeller 21. Accordingly, the volute plenum 50 is specifically formed above the top plate 11, inside the surrounding wall 52, below the top shell 51, and the impeller 21 is located above the top plate 11, inside the surrounding wall 52, below the top shell 51.

The top shell 51 has the suction inlet in the center, that is, the top of the volute 5 has the suction inlet in the center, and the top shell 51 is a substantially annular horizontal plate surrounding the suction inlet. The suction inlet is provided with a mesh grille 53 to prevent a large volume of foreign matter from entering the suction inlet to damage the fan 2, and the grille 53 may be integrally formed with the top case 51 or may be separately formed and assembled to the top case 51.

The wind-guiding ring 55 is connected to the inner edge of the top shell 51, and extends from the top shell 51 to the inside and downwards in an arc shape and then vertically and downwards. The lower end of the air guide ring 55 is inserted into the air inlet 20 of the fan 2, that is, the lower end of the air guide ring 55 is inserted into the inner edge 2120 of the upper cover plate 212 of the impeller 21, so that the air guide ring 55 communicates the suction inlet with the air inlet 20 of the fan 2.

Preferably, the wind guide ring 55 and the top shell 51 of the volute 5 are integrally formed, so as to reduce the assembly process, increase the production speed of the fan filter unit 100, reduce the assembly joints, ensure the sealing performance and improve the air supply efficiency of the whole machine.

Further, at the centrifugal wind outlet 701, the airflow f1 exits the wind tunnel 70 substantially horizontally or slightly obliquely upward under the guidance of the flow guiding structure 7, so that the wind speed uniformity can be further ensured.

Specifically, the flow guiding structure 7 has a bottom flow guiding wall 72 defining the lower boundary of the air duct 70, and in this embodiment, at the centrifugal air outlet 701, the bottom flow guiding wall 72 is set to be horizontal along the air flow direction, so that the air flow f1 can horizontally leave the centrifugal air outlet 701 instead of directly blowing the filter 3 downwards, and the air speed is ensured to uniformly pass through the filter 3 after the air flow is fully circulated in the inner cavity 10 of the box body 1, thereby further improving the air speed uniformity of the air supply unit in this embodiment. Of course, in a modified embodiment, at the centrifugal outlet 701, the bottom guiding wall 72 may also be set to be slightly inclined upward along the airflow direction, so that the airflow may leave the centrifugal outlet 701 slightly inclined upward instead of directly blowing the filter 3 downward, and it may also be ensured that the wind speed passes through the filter 3 uniformly after the airflow is fully circulated in the inner cavity 10 of the box 1, further improving the wind speed uniformity of the air supply unit.

In addition, in the preferred embodiment, in order to further ensure the uniformity of the wind speed and avoid the wind speed just below the bottom guide wall 72 from being too small, a plurality of small holes penetrating the bottom guide wall 72 up and down may be further provided, so as to facilitate the delivery of less air flow just below the bottom guide wall 72. It will be appreciated that the area of these apertures is much smaller than the area of the centrifugal outlet 701.

Preferably, the flow guiding structure 7 is located on both upper and lower sides of the top plate 11, that is, it includes a partial structure 7a located above the top plate 11 and a partial structure 7b located below the top plate 11; accordingly, the air duct 70 meets the volute air chamber 50 at the side of the impeller 21, and extends obliquely downward and outward to the centrifugal air outlet 701 below the top plate 11. Thus, the air flow in the volute air chamber 50 enters the air duct 70 at the side of the impeller 21, and flows along the air duct 70 until leaving the air duct 70 from the centrifugal air outlet 701 and entering the inner chamber 10 of the box body 1.

Preferably, the fan 2 is configured as a centrifugal fan, the lower cover 213 of which is of a closed type (i.e., has no exhaust port), and the exhaust port of the fan 2 is formed around the blades 211, i.e., between the outer edge of the upper cover 212 and the outer edge of the lower cover 213. Thus, when the fan 2 is turned on, the airflow flows along the surface of the blade 211, then leaves the blade 211, is thrown tangentially around the impeller 21 to the inner wall surface of the scroll casing 5, and enters the air duct 70.

More preferably, the inner wall surface 520 of the surrounding wall 52 forms part of the inner wall surface of the volute 5, and in the present embodiment, the surrounding wall 52 is arranged coaxially with the impeller 21, and the horizontal cross section of the inner wall surface 520 is substantially circular or multi-segment circular arc with the central axis O of the impeller 21 as the center. In this manner, when the fan 2 is turned on, the airflow can smoothly flow along the inner wall surface 520 after the airflow leaves the blade 211. Of course, in alternate embodiments, the shape of the surrounding wall 52 is not so limited.

Further, regarding the specific structure of the flow guiding structure 7, in the present embodiment, in addition to the aforementioned bottom flow guiding wall 72, the flow guiding structure 7 further includes an inner flow guiding wall 74, an outer flow guiding wall 71, and a top flow guiding wall 73.

Wherein the outer guide wall 71 defines an outer boundary (i.e., a boundary on a side away from the central axis O) of the air outlet duct 70; the outer guide wall 71 is parallel to the vertical direction and extends outward from the inner wall surface 520 of the scroll casing 5 around the central axis O in a curved manner, that is, the distance from the outer guide wall 71 to the central axis O increases gradually in the airflow direction in the circumferential direction of the central axis O. Therefore, along the airflow direction, the distance between the extension line 7t of the air duct 70 and the central axis O gradually increases, so as to realize outward air outlet at the centrifugal air outlet 701.

Opposite the outer guide wall 71, the inner guide wall 74 defines an inner boundary (i.e., a boundary on a side close to the central axis O) of the air outlet duct 70, which is disposed below the top plate 11 and is configured in a shape of an equal-diameter circular arc extending around the central axis O, for example, as shown in fig. 7, and the inner guide wall 74 is located on a circle C having a center on the central axis O.

Opposite the bottom guide wall 72, the top guide wall 73 defines an upper boundary of the air outlet duct 70, which protrudes outwardly from the inner wall surface 520 of the scroll casing 5, and connects an upper edge of the outer guide wall 71 with the inner wall surface 520 of the scroll casing 5. Also, the top guide wall 73 extends obliquely downward around the central axis O to guide the airflow gradually downward.

Based on the above, in the present embodiment, the outer guide wall 71, the bottom guide wall 72, the top guide wall 73 and the inner guide wall 74 together define the air duct 70, and further, the partial structure 7a of the flow guide structure 7 located above the top plate 11 is configured as an L-shaped structure formed by the outer guide wall 71 and the top guide wall 73; the partial structure 7b of the flow guiding structure 7 located below the top plate 11 is configured as a U-shaped structure formed by the bottom flow guiding wall 72, the inner flow guiding wall 74 and the outer flow guiding wall 71, and the centrifugal air outlet 701 is surrounded by the bottom flow guiding wall 72, the inner flow guiding wall 74 and the outer flow guiding wall 71.

As mentioned above, it is only one implementation manner of the flow guiding structure 7, and of course, in a modified embodiment, the specific structure of the flow guiding structure 7 may be different from that of the present embodiment, for example, the inner flow guiding wall 74 is omitted, the top flow guiding wall 73 is omitted, and the like.

Preferably, the flow guiding structure 7 is integrally formed with the volute 5, thereby enhancing the sealing performance of the structure and avoiding the problem of cumbersome assembly. Of course, in a modified embodiment, the flow guiding structure 7 may be formed separately from the volute 5, or a part of the flow guiding structure 7 may be formed integrally with the volute 5 and another part may be formed separately from the volute 5.

Further, the peripheral edge of the bottom end of the volute 5 is provided with a flange 54, and the flange 54 is tightly attached to the upper surface of the top plate 11 so as to realize the sealing contact between the volute 5 and the top plate 11. Moreover, the flange 54 can be tightly connected with the top plate 11 through a screw structure, and the assembly is convenient.

Preferably, the shape of the air inlet 110 corresponds to the shape of the partial structure 7b of the flow guiding structure 7 (i.e., the portion of the flow guiding structure 7 located below the top plate 11), so that the partial structure 7b can penetrate through the air inlet 110 from top to bottom during the assembly process until the flange 54 is tightly attached to the top plate 11.

Further preferably, the air supply unit includes two or more flow guiding structures 7 uniformly and repeatedly arranged around the central axis O, that is, the number of the flow guiding structures 7 is set to be two, three, four or more, and the flow guiding structures 7 are set to be the same in structure and uniformly arranged around the central axis O. Therefore, air is discharged into the inner cavity 10 of the box body 1 through two or more air ducts 70, and the uniformity of the wind speed of the air discharged from the inner cavity 10 can be further improved. In this embodiment, the number of the flow guide structures 7 is set to be 4, and the centrifugal air outlets 701 of the 4 flow guide structures 7 are respectively located in four partitions of the rectangular inner cavity 10 in a shape like a Chinese character 'tian', that is, the rectangular inner cavity 10 is divided into four equal rectangular partitions according to the Chinese character 'tian', and each partition has 1 centrifugal air outlet 701.

The box body 1 has two or more air inlets 110 repeatedly arranged around the central axis O corresponding to the number of the flow guide structures 7, in this embodiment, the number of the air inlets 110 is set to 4, and the 4 air inlets 110 are respectively formed in the field-shaped four-divided regions of the rectangular top plate 11.

Further, the minimum distances R between all the centrifugal air outlets 701 and the central axis O are all the same, that is, the innermost ends of all the centrifugal air outlets 701 are located on the same circle C with the central axis O as the center.

And the air supply unit also comprises an air deflector 8 fixed below the top plate 11. The air guiding plate 8 protrudes downward from the top plate 11 and extends in the radial direction on two opposite sides of the central axis O, so that all the centrifugal air outlets 701 are equally divided on two sides of the air guiding plate 8. As shown in fig. 7, two of the 4 centrifugal outlets 701 (upper two in the figure) are located on one side of the air deflector 8 (upper side in the figure, i.e., one semicircular side of the circle C), and the other two of the 4 centrifugal outlets 701 (lower two in the figure) are located on the other side of the air deflector 8 (lower side in the figure, i.e., the other semicircular side of the circle C). Thus, by the arrangement of the air deflector 8, a part of the air flow f2 at the centrifugal air outlet 701 can be promoted to flow close to the central axis O, so that the air speed in the area of the circle C is relatively increased, the air speeds in the middle area 10a and the peripheral area 10b of the inner cavity 10 are further balanced, and the uniformity of the air speed is further promoted.

In the present embodiment, the air guiding plate 8 has a substantially V-shaped structure, and includes a first plate 81 and a second plate 82 which are oppositely disposed. The first plate 81 and the second plate 82 are inclined from top to bottom toward each other, so that the airflow f2 can be downward when flowing on the surface of the first plate 81 and the second plate 82, and smooth airflow is realized.

Preferably, the bottom end of the air guiding plate 8 is lower than the bottom end of the centrifugal air outlet 701, or is flush with the bottom end of the centrifugal air outlet 701. Therefore, after leaving the centrifugal air outlet 701, the air flow f2 can be smoothly blocked by the air deflector 8, so as to fully realize the air guiding function of the air deflector 8. In this embodiment, the respective lower edges of the first plate 81 and the second plate 82 are connected by a horizontal third plate 83, the third plate 83 constitutes the bottom end of the air deflector 8; of course, in an alternative embodiment, the respective lower end edges of the first and second plates 81 and 82 may be directly joined.

Further, the motor 22 of the fan 2 is disposed below the impeller 21, and an output shaft thereof is connected to the impeller 21 for driving the blades 211 to rotate about the central axis O. Preferably, the motor 22 is arranged coaxially with the impeller 21. In the present embodiment, the motor 22 is disposed below the top plate 11 of the cabinet 1. Specifically, a mounting passage 111 is formed at a central position of the top plate 11, the mounting passage 111 penetrating the top plate 11 up and down, and is sized and shaped to allow the motor 22 to pass through up and down, but not to allow the impeller 21 to pass through up and down. From this, when installing fan 2 on box 1, can pass installation passageway 111, move to the below of roof 11 with motor 22 top-down, simultaneously, motor 22's last turn-ups supports, supports and presses on the support 13 of roof 11, then fixes lower cover plate 213 through screw, buckle or other fasteners, can accomplish fan 2's installation, and is simple, quick, and convenient.

Furthermore, the air deflector 8 is arranged across the installation channel 111, on one hand, the motor 22 can be supported and fixed on the air deflector 8, so that the motor 22 is stabilized; on the other hand, the air deflectors 8 are fixedly connected to the top plate 11 on both opposite sides of the installation channel 111, so that the structural strength of the top plate 11 can be further enhanced by the pulling action of the air deflectors 8. Specifically, as shown in the embodiment drawings, the top plate 11 includes a plurality of reinforcing ribs 15, one of the reinforcing ribs 15 is divided into two sections (for example, the number 151) located at two opposite sides of the installation channel 111, and the air guide plate 8 and the two sections of the reinforcing ribs 151 are both fastened and installed by screws, so that the strength of the top plate 11 is greatly enhanced.

Further, the air deflection plate 8 has a gap 80 formed between the first plate 81 and the second plate 82; and the air supply unit further includes a controller 4, and the controller 4 is electrically connected to the motor 22 through a wire for controlling the motor 22. In the embodiment, the controller 4 is arranged near the outer end 801 of the air deflector 8; the wires are disposed within the gap 80 and may be routed from the motor 22 along the gap 80 to extend from the outer end 801 of the air deflection assembly 8 and then connected to the controller 4. Therefore, through the structural design and the position design of the air deflector 8, the wires passing through the motor 22 can be conveniently routed, the existing wire fixing structure is omitted, the cost is further reduced, and the assembly is convenient.

In summary, compared with the prior art, the present embodiment has the following beneficial effects: on one hand, the impeller 21, the volute 5 and the air guide ring 55 are arranged above the top plate 1, so that the box body 1 does not need to be arranged into a large size for accommodating structures such as the impeller 21, the air guide ring 55 and the volute 5, the height of the box body 1 is greatly reduced, and the material cost and the weight of the box body 1 are reduced; the number and the weight of the required structural members are greatly reduced, so that the material cost, the transportation cost and the installation cost of the whole machine are greatly reduced, the cost is obviously reduced, and the economic benefit is great; on the other hand, the wind speed uniformity is ensured by arranging the flow guide structure 7 while the cost is reduced, and the wind speed uniformity is greatly improved by further combining the arrangement of the wind deflector 8; on the other hand, the whole installation of air supply unit is simple and convenient, quick, promotes production efficiency.

Example 2

Referring to fig. 9 to 15, a further embodiment of the air supply unit will be described in detail with reference to fig. 4.

As described above, the air blowing unit includes the casing 1 and the fan 2, and in the present embodiment, referring to fig. 11a and 11b, the fan 2 includes the motor 22 and the impeller 21. The impeller 21 is mounted above the top plate 11 and has a central axis O (marked as fig. 15), and specifically includes a plurality of blades 211, a curved upper cover plate 212 located above the blades 211, and a planar lower cover plate 213 located below the blades 211; the lower cover plate 213 is positioned above the top plate 11; the blades 211 can rotate around the central axis O under the driving of the motor 22, so as to drive the air flow to form the air flow of the air supply unit; the inner edge 2120 of the upper cover plate 212 encloses an inlet 20, and when the blades 211 rotate, airflow can flow from the inlet 20 to the blades 211.

The air supply unit further comprises a volute diversion mechanism for guiding the airflow formed by the fan 2. Referring to fig. 9 to 13b, the volute diversion mechanism specifically includes a volute 5, a wind guiding ring 55, and a diversion structure 7.

Wherein the volute 5 is mounted above the top plate 11 and encloses a volute wind chamber 50, and the volute wind chamber 50 accommodates the impeller 21 therein; and, the top of the volute 5 is provided with a suction inlet, and the wind guide ring 55 is positioned between the volute 5 and the impeller 21 to communicate the suction inlet with the air inlet 20 of the fan 2. Thus, when the fan 2 is turned on, the external air above the volute 5 passes through the suction inlet downwards along with the rotation of the blade 211, and then flows from the suction inlet to the air inlet 20 of the fan 2 under the guidance of the air guiding ring 55, and then flows along the surface of the blade 211 until leaving the blade 211 and flowing in the volute air cavity 50.

Thus, compared with the prior art, in the embodiment, the impeller 21, the volute 5 and the wind guiding ring 55 are arranged above the top plate 1, and the box body 1 does not need to be arranged into a larger volume for accommodating the impeller 21, the wind guiding ring 55, the volute 5 and other structures, so that the height of the box body 1 is greatly reduced, and the material cost and the weight of the box body 1 are reduced; moreover, the impeller 21, the volute 5 and the like are directly supported on the top plate 11, and a middle partition plate 12, a fan fixing base 9 and the like in the figures 1-3 can be omitted in the inner cavity 10 of the box body 1 compared with the prior art, so that the material cost and the weight are further reduced; in addition, due to the reduction of the weight, the transportation cost and the installation cost required when the fan filter unit 100 is installed on the suspended ceiling through the handle 6 are correspondingly reduced. That is, overall, adopt the air supply unit of this embodiment, have the advantage that can greatly reduced fan filter unit's cost.

Also, in the present application, the flow guiding structure 7 is disposed at the air inlet 110 for guiding the flow of the air flow.

In particular, the flow guiding structure 7 defines an air duct 70. The air duct 70 is communicated with the volute air chamber 50 and has a centrifugal air outlet 701 located below the top plate 11, that is, the centrifugal air outlet 701 is formed in the inner cavity 10 of the box body 1. Thus, when the fan 2 is turned on, the airflow in the volute chamber 50 can flow into the air duct 70 and flow in the inner chamber 10 after leaving the air duct 70 through the centrifugal outlet 701.

At the centrifugal outlet 701, the air duct 70 extends in an outward direction away from the central axis O. As such, referring to fig. 15, at the centrifugal air outlet 701, the air flow f1 exits the flow guiding structure 7 substantially flowing outwards away from the central axis O under the guidance of the air duct 70. Like this, through the setting to water conservancy diversion structure 7, can realize the control of air supply direction, combine aforementioned fan 2, spiral case 5, wind-guiding circle 55's setting, not only can realize the reduction of cost, but also can make and satisfy the basic requirement to the wind speed homogeneity in the trade under the low-cost condition, avoid leading to the not up to standard condition of wind speed homogeneity to take place because reduce cost.

Specifically, the volute 5 includes a top shell 51 that substantially covers over the impeller 21 and a surrounding wall 52 that surrounds the impeller 21. Accordingly, the volute plenum 50 is specifically formed above the top plate 11, inside the surrounding wall 52, below the top shell 51, and the impeller 21 is located above the top plate 11, inside the surrounding wall 52, below the top shell 51.

The top shell 51 has the suction inlet in the center, that is, the top of the volute 5 has the suction inlet in the center, and the top shell 51 is a substantially annular horizontal plate surrounding the suction inlet. The suction inlet is provided with a mesh grille 53 to prevent a large volume of foreign matter from entering the suction inlet to damage the fan 2, and the grille 53 may be integrally formed with the top case 51 or may be separately formed and assembled to the top case 51.

The wind-guiding ring 55 is connected to the inner edge of the top shell 51, and extends from the top shell 51 to the inside and downwards in an arc shape and then vertically and downwards. The lower end of the air guide ring 55 is inserted into the air inlet 20 of the fan 2, that is, the lower end of the air guide ring 55 is inserted into the inner edge 2120 of the upper cover plate 212 of the impeller 21, so that the air guide ring 55 communicates the suction inlet with the air inlet 20 of the fan 2.

Preferably, the wind guide ring 55 and the top shell 51 of the volute 5 are integrally formed, so as to reduce the assembly process, increase the production speed of the fan filter unit 100, reduce the assembly joints, ensure the sealing performance and improve the air supply efficiency of the whole machine.

Preferably, in this embodiment, the inner wall surface of the volute 5 is provided with a plurality of reinforcing ribs 56, and the reinforcing ribs 56 are divergently wound around the periphery of the air guiding ring 55, so as to increase the structural strength of the volute 5 and avoid damage caused by treading by people.

Further, at the centrifugal wind outlet 701, the airflow f1 exits the wind tunnel 70 substantially horizontally or slightly obliquely upward under the guidance of the flow guiding structure 7, so that the wind speed uniformity can be further ensured.

Further, in the present embodiment, the air duct 70 further has a centripetal air outlet 702 located below the top plate 11, that is, the centripetal air outlet 702 is formed in the inner cavity 10 of the casing 1, so that when the fan 2 is turned on, the air flow in the volute air chamber 50 can flow into the air duct 70 and flow in the inner cavity 10 after leaving the air duct 70 through the centripetal air outlet 702.

The centripetal air outlet 702 is formed inside the air duct 70, or inside the flow guiding structure 7 close to the central axis O. At the centripetal outlet 702, as shown in fig. 15, the air duct 70 opens inwardly toward the central axis O to direct the air flow f3 inwardly toward the central axis O. Thus, through the combination of the centripetal air outlet 702 and the centrifugal air outlet 701, the flow guide structure 7 can simultaneously realize the outward air supply away from the central axis O and the inward air supply approaching the central axis O, so that the uniformity of the wind speed in the inner cavity 10 of the box body 1 is ensured, compared with the air outlet mode in the prior art, the uniformity of the wind speed is greatly improved, and the wind speed far exceeds the industrial standard; and by combining the arrangement of the fan 2, the volute 5 and the air guide ring 55, not only can the cost be reduced, but also the wind speed uniformity can be realized under the condition of low cost, and the condition that the wind speed uniformity is poor due to the reduction of the cost is avoided.

The flow guide structure 7 is positioned on the upper side and the lower side of the top plate 11, namely, the flow guide structure comprises a partial structure 7a positioned above the top plate 11 and a partial structure 7b positioned below the top plate 11; accordingly, the air duct 70 meets the volute air chamber 50 at the side of the impeller 21, and extends obliquely downward and outward to the centrifugal air outlet 701 below the top plate 11. Thus, the air flow in the volute air chamber 50 enters the air duct 70 at the side of the impeller 21, and flows along the air duct 70 until leaving the air duct 70 from the centrifugal air outlet 701 and entering the inner chamber 10 of the box body 1.

The fan 2 is configured as a centrifugal fan, and the lower cover 213 thereof is of a closed type (i.e., has no air outlet), and the air outlet of the fan 2 is formed around the blades 211, i.e., between the outer edge of the upper cover 212 and the outer edge of the lower cover 213. Thus, when the fan 2 is turned on, the airflow flows along the surface of the blade 211, then leaves the blade 211, is thrown tangentially around the impeller 21 to the inner wall surface of the scroll casing 5, and enters the air duct 70.

More preferably, the inner wall surface 520 of the surrounding wall 52 forms part of the inner wall surface of the volute 5, and in the present embodiment, the surrounding wall 52 is arranged coaxially with the impeller 21, and the horizontal cross section of the inner wall surface 520 is substantially circular or multi-segment circular arc with the central axis O of the impeller 21 as the center. In this manner, when the fan 2 is turned on, the airflow can smoothly flow along the inner wall surface 520 after the airflow leaves the blade 211. Of course, in alternate embodiments, the shape of the surrounding wall 52 is not so limited.

Further, regarding the specific structure of the flow guiding structure 7, in the present embodiment, the flow guiding structure 7 further includes an inner flow guiding wall 74, an outer flow guiding wall 71, a top flow guiding wall 73, a bottom flow guiding wall 72, and a partition wall 75.

The partition wall 75 divides the air duct 70 into a centrifugal air duct 70a and a centripetal air duct 70b, the centrifugal air duct 70a has a centrifugal air outlet 701, the centripetal air duct 70b has a centripetal air outlet 702, and the centrifugal air duct 70a and the centripetal air duct 70b are provided. That is, after entering the centrifugal air duct 70a, the air flow in the volute air chamber 50 completely exits the air duct 70 through the centrifugal air outlet 701, and after entering the centripetal air duct 70b, the air flow in the volute air chamber 50 completely exits the air duct 70 through the centripetal air outlet 702. Therefore, through the arrangement of the centrifugal air duct 70a and the centripetal air duct 70b which are independent of each other, the reasonable distribution of air flow can be realized, and the uniformity of the air speed is further enhanced.

The centrifugal air outlet 701 is surrounded by the outer guide wall 71, the inner guide wall 74 and the bottom guide wall 72.

The outer guide wall 71 defines the outer boundary of the air outlet duct 70 (i.e., the boundary of the side away from the central axis O); the outer guide wall 71 is parallel to the vertical direction and extends outward from the inner wall surface 520 of the scroll casing 5 around the central axis O in a curved manner, that is, the distance from the outer guide wall 71 to the central axis O increases gradually in the airflow direction in the circumferential direction of the central axis O. Therefore, at the centrifugal air outlet 701, the distance between the extension line 7t of the centrifugal air duct 70a and the central axis O is gradually increased to realize outward air outlet at the centrifugal air outlet 701.

Opposite the outer guide wall 71, the inner guide wall 74 defines an inner boundary of the air outlet duct 70 (i.e., a boundary on a side close to the central axis O), which is disposed below the top plate 11, and particularly defines an inner boundary of the centrifugal air duct 70 a.

The bottom guide wall 72 defines a lower boundary of the air outlet duct 70. In this embodiment, the bottom guiding wall 72 is set to be horizontal along the airflow direction at the centrifugal outlet 701, so that the airflow horizontally leaves the centrifugal outlet 701 instead of directly blowing the filter downwards, and the air speed is ensured to uniformly pass through the filter after the airflow is fully circulated in the inner cavity 10 of the box 1, thereby further improving the air speed uniformity of the air supply unit in this embodiment. In a modified embodiment, the bottom guiding wall 72 may also be disposed in a slightly inclined upward state along the airflow direction at the centrifugal outlet 701, so that the airflow can leave the centrifugal outlet 701 slightly inclined upward instead of directly blowing the filter downward, and it is also ensured that the wind speed uniformly passes through the filter after the airflow is fully circulated in the inner cavity 10 of the box 1, and the wind speed uniformity of the air supply unit is further improved.

Opposite the bottom guide wall 72, the top guide wall 73 defines an upper boundary of the air outlet duct 70, which protrudes outwardly from the inner wall surface 520 of the scroll casing 5, and connects an upper edge of the outer guide wall 71 with the inner wall surface 520 of the scroll casing 5. Also, the top guide wall 73 extends obliquely downward around the central axis O to guide the airflow gradually downward.

In addition, as can be seen from the foregoing, the outer guide wall 71 and the bottom guide wall 72 can be used to define the boundary of the centrifugal air duct 70a, and in this embodiment, a portion 72 'of the bottom guide wall 72 and a portion 71' of the outer guide wall 71 can also be used to define the boundary of the centrifugal air duct 70 b.

Specifically, the partition wall 75 protrudes inward from the outer guide wall 71, is located between the top guide wall 74 and the bottom guide wall 72, and meets the bottom guide wall 71; the partition wall 75, the portion of the bottom guide wall 72 located below the partition wall 75 (i.e., the portion 72 'of the bottom guide wall 72), and the portion of the outer guide wall 71 located between the partition wall 75 and the bottom guide wall 72 (i.e., the portion 71' of the outer guide wall 71) together define the radial air flow channel 70 b.

An opening is formed between the inner edge of the partition wall 75 and the inner edge of the bottom flow guide wall 72, the upper part of the opening is located above the top plate 11 to form a centripetal air inlet 703 of the centripetal air duct 70b, and the lower part of the opening is located below the top plate 11 to form a centripetal air outlet 702 of the centripetal air duct 70 b. As above, the flow guiding structure 7 has the advantages of simple structure and being beneficial to optimizing the uniformity of wind speed by the arrangement of the partition wall 75.

Further preferably, in the present embodiment, a part of the flow guiding structure 7 is integrally formed with the scroll casing 5 to form a first structural member 57a, and a peripheral edge of a lower end of the first structural member 57a is hermetically mounted on the upper surface of the top plate 11 by a flange 54; wherein, the flange 54 can be fastened and connected with the top plate 11 through a screw structure, and the assembly is convenient. Meanwhile, the rest of the flow guide structure 7 is configured as an integrally formed second structural member 57b, and the lower portion of the second structural member 57b passes through the air inlet 110 from top to bottom to extend into the inner cavity 10 of the box body 1, and is hermetically mounted on the upper surface of the top plate 11 through the turned-over edge 79; wherein, turn-ups 79 can pass through screw structure fastening connection with roof 11, and the equipment is convenient. Therefore, through the arrangement of the first structural member 57a and the second structural member 57b, the single structural member can be conveniently machined and formed, the machining and forming difficulty is avoided, and meanwhile, the good sealing effect of the volute air cavity 50, the air duct 70 and the like can be guaranteed.

More preferably, the second structure 57b generally includes a bottom guide wall 72, a partition wall 75, and a portion of the outer guide wall 71, which is assembled to the first structure 57 a. In detail, the first structural member 57a has a groove 77 recessed at an inner side thereof and a catching portion 770 formed at the groove 77; and the second structural member 57b is fitted into the groove 770, and it has a fitting portion 771; one of the two of joining in marriage portion 771 and joint portion 770 is vertical draw-in groove and two another lug, joint portion 770 is the draw-in groove in this embodiment, joining in marriage portion 771 is the lug, when second structure 57b cooperates to recess 770, joining in marriage portion 771 and joint portion 770 are spacing each other on axis O's circumference, therefore, it rotates around axis O to restrict relative first structure 57a of second structure 57b, can realize spacing each other on the one hand, on the other hand can realize the direction in the assembly process, easy to assemble.

As mentioned above, the specific implementation of the volute 5 and the flow guiding structure 7 has the advantages of simple structure, convenient assembly, and favorable optimization of wind speed uniformity. Of course, in the modified embodiment, the specific structure of the flow guide structure 7 and the specific structure of the volute 5 are not limited thereto.

Further, the air supply unit includes two or more flow guide structures 7 that are uniformly and repeatedly arranged around the central axis O, that is, the number of the flow guide structures 7 is set to two, three, four, or more, and these flow guide structures 7 are set to have the same structure and are uniformly arranged around the central axis O. Therefore, air is discharged into the inner cavity 10 of the box body 1 through two or more air ducts 70, and the uniformity of the wind speed of the air discharged from the inner cavity 10 can be further improved. In this embodiment, the number of the flow guiding structures 7 is set to be 4, and the centrifugal air outlets 701 of the 4 flow guiding structures 7 are respectively located in four partitions of the rectangular inner cavity 10 in a shape like a Chinese character 'tian', that is, the rectangular inner cavity 10 is divided into four equal rectangular partitions according to the Chinese character 'tian', and each partition is provided with 1 centrifugal air outlet 701 and 1 centripetal air outlet 702.

The box body 1 has two or more air inlets 110 repeatedly arranged around the central axis O corresponding to the number of the flow guide structures 7, in this embodiment, the number of the air inlets 110 is set to 4, and the 4 air inlets 110 are respectively formed in the field-shaped four-divided regions of the rectangular top plate 11.

Further, the minimum distances R between all the centrifugal air outlets 701 and the central axis O are all the same, that is, the innermost ends of all the centrifugal air outlets 701 are located on the same circle C with the central axis O as the center and the radius R as the radius R. Similarly, the minimum distances R2 between all the centripetal air outlets 702 and the central axis O are all the same, that is, the innermost ends 7022 of all the centripetal air outlets 702 are located on a circle C2 with the central axis O as the center and the radius R2 as the radius.

And the air supply unit also comprises an air deflector 8 fixed below the top plate 11. The air deflectors 8 project downward from the top plate 11 and extend radially on opposite sides of the central axis O. In this way, by the arrangement of the air deflector 8, on the one hand, the air flow f3 blown out to the centripetal air outlet 702 is guided by the air deflector 8 to flow downwards, so that the wind speeds of the central area 10a and the peripheral area 10b of the inner cavity 10 are further balanced, and the wind speed uniformity is further promoted; more advantageously, a part of the airflow f2 at the centrifugal outlet 701 may be promoted to flow toward the central axis O, so that the wind speed in the area of the circle C is relatively increased, and further, the wind speeds in the central area 10a and the peripheral area 10b of the inner cavity 10 are balanced, thereby further promoting the uniformity of the wind speed.

Preferably, all the centrifugal outlets 701 and all the centripetal outlets 702 are equally divided on both sides of the air deflector 8. As shown in fig. 15, two of the 4 centripetal air outlets 702 (two upper in the figure) are located on one side of the air deflector 8 (one upper side in the figure, i.e., one semicircular side of the circle C2), and the other two of the 4 centripetal air outlets 702 (two lower in the figure) are located on the other side of the air deflector 8 (one lower side in the figure, i.e., the other semicircular side of the circle C2); two of the 4 centrifugal outlets 701 (upper two in the figure) are located on one side of the air deflector 8 (upper side in the figure, i.e. one semicircular side of the circle C), and the other two of the 4 centrifugal outlets 701 (lower two in the figure) are located on the other side of the air deflector 8 (lower side in the figure, i.e. the other semicircular side of the circle C).

Preferably, the bottom end of the air guiding plate 8 is lower than the bottom end of the centripetal air outlet 802, or is flush with the bottom end of the centripetal air outlet 802. Therefore, after leaving the centripetal air outlet 802, the airflow f3 can be smoothly blocked by the air deflector 8, so as to fully realize the air guiding function of the air deflector 8. Of course, it is more preferable that the bottom end of the air guiding plate 8 is also lower than the bottom end of the centrifugal air outlet 701, or is flush with the bottom end of the centrifugal air outlet 701. Therefore, after leaving the centrifugal air outlet 701, the air flow f2 can be smoothly blocked by the air deflector 8, so as to fully realize the air guiding function of the air deflector 8.

In this embodiment, the bottom end of the centripetal air outlet 802, the bottom end of the centrifugal air outlet 702, and the bottom end of the air deflector 8 are aligned with each other, so that the uniformity of the wind speed is ensured, and meanwhile, as few materials as possible are saved, the weight of the air supply unit is reduced, and the cost is further reduced.

Further, the distance between the two outer ends 801 of the air deflector 8 and the central axis O is not less than the radius R of the circle C, that is, not less than the minimum distance R between the centrifugal air outlet 701 and the central axis O, or not less than the radius R2 of the circle C2, that is, not less than the minimum distance R2 between the centripetal air outlet 702 and the central axis O. Therefore, the air deflector 8 can be ensured to fully block and guide part of the airflow f2 at the centrifugal air outlet 701 or the airflow f3 at the centripetal air outlet 702, so as to achieve a better flow equalizing effect.

Preferably, the distance between the two outer ends 801 of the air deflector 8 and the central axis O is not less than the radius R of the circle C, that is, not less than the minimum distance R between the centrifugal air outlet 701 and the central axis O, and is not less than the radius R2 of the circle C2, that is, not less than the minimum distance R2 between the centripetal air outlet 702 and the central axis O.

In the embodiment of the drawings, the radius R of the circle C is smaller than the radius R2 of the circle C2, and the distance between the two outer ends 801 of the air deflector 8 and the central axis O is greater than the radius R2 of the circle C2 and slightly smaller than the maximum distance between the centripetal air outlet 702 and the central axis O (i.e., the distance between the outermost end 7021 of the centripetal air outlet 702 and the central axis O). Therefore, the air deflector 8 can be ensured to fully block and guide part of the airflow f2 at the centrifugal air outlet 701 and the airflow f3 at the centripetal air outlet 702, so as to realize the maximum flow equalizing effect.

In the present embodiment, the air guiding plate 8 has a substantially V-shaped structure, and includes a first plate 81 and a second plate 82 which are oppositely disposed. The first plate 81 and the second plate 82 are inclined from top to bottom toward each other, so that the airflow f2 can be downward when flowing on the surface of the first plate 81 and the second plate 82, and smooth airflow is realized.

The respective lower end edges of the first plate 81 and the second plate 82 are connected by a horizontal third plate 83, the third plate 83 constitutes the bottom end of the air deflector 8; of course, in an alternative embodiment, the respective lower end edges of the first and second plates 81 and 82 may be directly joined.

Further, the motor 22 of the fan 2 is disposed below the impeller 21, and an output shaft thereof is connected to the impeller 21 for driving the blades 211 to rotate about the central axis O. Preferably, the motor 22 is arranged coaxially with the impeller 21. In the present embodiment, the motor 22 is disposed below the top plate 11 of the cabinet 1. Specifically, a mounting passage 111 is formed at a central position of the top plate 11, the mounting passage 111 penetrating the top plate 11 up and down, and is sized and shaped to allow the motor 22 to pass through up and down, but not to allow the impeller 21 to pass through up and down. From this, when installing fan 2 on box 1, can pass installation passageway 111, move to the below of roof 11 with motor 22 top-down, simultaneously, motor 22's last turn-ups supports, supports and presses on the support 13 of roof 11, then fixes lower cover plate 213 through screw, buckle or other fasteners, can accomplish fan 2's installation, and is simple, quick, and convenient.

The air deflector 8 is arranged across the installation channel 111, on one hand, the motor 22 can be supported and fixed on the air deflector 8, so that the motor 22 is stabilized; on the other hand, the air deflectors 8 are fixedly connected to the top plate 11 on both opposite sides of the installation channel 111, so that the structural strength of the top plate 11 can be further enhanced by the pulling action of the air deflectors 8. Specifically, as shown in the embodiment drawings, the top plate 11 includes a plurality of reinforcing ribs 15, one of the reinforcing ribs 15 is divided into two sections (for example, the number 151) located at two opposite sides of the installation channel 111, and the air guide plate 8 and the two sections of the reinforcing ribs 151 are both fastened and installed by screws, so that the strength of the top plate 11 is greatly enhanced.

Further, the air deflection plate 8 has a gap 80 formed between the first plate 81 and the second plate 82; and the air supply unit further includes a controller 4, and the controller 4 is electrically connected to the motor 22 through a wire for controlling the motor 22. In the embodiment, the controller 4 is arranged near the outer end 801 of the air deflector 8; the wires are disposed within the gap 80 and may be routed from the motor 22 along the gap 80 to extend from the outer end 801 of the air deflection assembly 8 and then connected to the controller 4. Therefore, through the structural design and the position design of the air deflector 8, the wire passing through the motor 22 can be conveniently routed, and the existing wire fixing structure is eliminated.

In addition, in an optional embodiment, to further ensure the uniformity of the wind speed and avoid the wind speed just below the bottom diversion wall 72 from being too small, a plurality of small holes penetrating the bottom diversion wall 72 up and down may be further provided, so as to facilitate the delivery of less air flow just below the bottom diversion wall 72. It will be appreciated that the area of these apertures is much smaller than the area of the centrifugal outlet 701 and much smaller than the area of the centripetal outlet 702.

In summary, compared with the prior art, the present embodiment has the following beneficial effects: on one hand, the impeller 21, the volute 5 and the air guide ring 55 are arranged above the top plate 1, so that the box body 1 does not need to be arranged into a large size for accommodating structures such as the impeller 21, the air guide ring 55 and the volute 5, the height of the box body 1 is greatly reduced, and the material cost and the weight of the box body 1 are reduced; the number and the weight of the required structural members are greatly reduced, so that the material cost, the transportation cost and the installation cost of the whole machine are greatly reduced, the cost is obviously reduced, and the economic benefit is great; on the other hand, the wind speed uniformity is ensured by arranging the flow guide structure 7 while the cost is reduced, and the wind speed uniformity is greatly improved by further combining the arrangement of the wind deflector 8; on the other hand, the whole installation of air supply unit is simple and convenient, quick, promotes production efficiency.

Claims (10)

1. The utility model provides a fan filter unit's air supply unit which characterized in that includes:

the box body comprises a top plate and an air inlet which vertically penetrates through the top plate;

a fan comprising an impeller mounted above the top plate;

the volute is arranged above the top plate, a volute air cavity containing the impeller is defined by the volute, and the top of the volute is provided with a suction inlet;

the air guide ring is positioned between the volute and the impeller so as to conduct an air inlet of the fan and the suction inlet; and the number of the first and second groups,

the flow guide structure is arranged at the air inlet and limits an air channel communicated with the volute air cavity, and the air channel is provided with a centrifugal air outlet positioned below the top plate; at the centrifugal air outlet, the air duct extends outwards away from the central axis of the impeller to guide the airflow to flow outwards away from the central axis.

2. The fan filter unit supply unit of claim 1, wherein the baffle structure includes a bottom baffle wall defining a lower boundary of the air duct; at the centrifugal air outlet, the bottom flow guide wall is arranged to be horizontal or obliquely upward so that the airflow leaves the centrifugal air outlet horizontally or obliquely upward.

3. The blower filter unit supply unit of claim 2, wherein the duct further has a centripetal air outlet located below the top plate; at the centripetal air outlet, the air duct is opened inwards towards the central axis to guide the airflow to flow inwards towards the central axis.

4. The blower filter unit supply unit of claim 3, wherein the flow guide structures are disposed on upper and lower sides of the top plate; the air duct intersects with the volute air cavity at the side of the impeller and extends outwards to the centrifugal air outlet in an inclined mode.

5. The blower filter assembly blower unit of claim 4 wherein the flow guide structure comprises:

an outer guide wall defining an outer boundary of the air duct and extending from an inner wall surface of the volute about the central axis in an outward curve;

a top guide wall defining an upper boundary of the air duct, connecting the outer side guide wall and an inner wall surface of the scroll casing, and extending obliquely downward around the central axis; and the number of the first and second groups,

and the inner side flow guide wall is used for limiting the inner boundary of the air channel, is positioned below the top plate and surrounds the centrifugal air outlet with the outer side flow guide wall and the bottom flow guide wall.

6. The blower unit of fan filter unit according to claim 5, wherein the flow guide structure further has a partition wall, the air duct is divided by the partition wall into a centrifugal air duct having the centrifugal air outlet and a centripetal air duct having the centripetal air outlet, and the centrifugal air duct and the centripetal air duct are independent of each other.

7. The blower filter assembly blower unit of claim 6 wherein the divider wall projects inwardly from the outer guide wall and is positioned between the top guide wall and the bottom guide wall; the centripetal air outlet is formed between the inner edge of the partition wall and the inner edge of the bottom flow guide wall.

8. The blower filter unit supply unit of claim 1, wherein the number of flow directing structures is two, three, four or more, and all of the flow directing structures are configured to be identical and are arranged uniformly around the central axis.

9. The blower filter unit blower unit of claim 1 further comprising air deflectors fixed below the top plate, the air deflectors extending radially on opposite sides of the central axis and projecting downwardly from the top plate to a bottom end no higher than the bottom end of the centrifugal air outlet.

10. The blower unit of a fan filter unit of claim 9, wherein the fan is configured as a centrifugal fan comprising a motor that drives the blades of the impeller to rotate about the central axis;

the top plate further has:

the mounting channel is communicated up and down and is used for mounting the motor into the box body from top to bottom; and the number of the first and second groups,

the air guide plate is arranged on the installation channel and is fixedly connected with the two reinforcing ribs, and the motor is supported on the air guide plate.

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