The volute guide mechanism of the fan and the air supply unit of the fan filter unit

Abstract

The present invention discloses a volute guide mechanism of a fan, and an air supply unit of a fan filter unit. The air supply unit comprises: a casing, which comprises a top plate, and an air inlet; a fan, which comprises an impeller installed above the top plate; a volute installed above the top plate, which encloses a volute air cavity containing the impeller, and a suction port is provided at the top of the volute; a guide structure, which defines an air duct connected to the volute air cavity, and the air duct has a centrifugal air outlet and a centripetal air outlet located below the top plate; at the centrifugal air outlet, the air duct extends outward away from the central axis of the impeller to guide the airflow to flow outward; at the centripetal air outlet, the air duct opens inward toward the central axis to guide the airflow to flow toward the central axis. The present invention ensures the uniformity of wind speed and solves the cost problem through the optimized design of the structure.

Description

Technical Field

[0001] The invention relates to a volute flow guide mechanism of a fan and an air supply unit of a fan filter unit, belonging to the technical field of air filtering devices. Background Art

[0002] The fan filter unit is a modular terminal air supply device with filtering function. Its full English name is FanFilter Unit, abbreviated as FFU. The fan filter unit sucks air from the top and then filters it through the filter. The filtered clean air is evenly delivered at a certain speed on the entire air outlet surface. Fan filter units are widely used in clean rooms, clean workbenches, clean production lines, assembled clean rooms and local Class 100 applications. They can not only improve the cleanliness level, reduce noise and vibration, but also greatly reduce the cost. They are easy to install and maintain, and are ideal equipment for clean environments.

[0003] The existing fan filter unit is composed of a filter 3 and an air supply unit, wherein the air supply unit mainly includes a housing 1, a fan 2 and a controller 4 for controlling the start and stop of the fan 2. The specific structure has become relatively mature after years of technological evolution, and the designs of various brands are similar. Figures 1 to 3 As shown, the existing box body 1 is generally configured as a rectangular member with an open bottom, and an air inlet 10 with a protective mesh cover 5 is centrally arranged on the top plate 11 of the box body 1; a middle partition 12 is arranged inside the box body 1, and the middle partition 12 is fixedly assembled on the frame of the box body 1 through a support beam 13, and an air guide ring 7, a fan 2, a fan fixing base 9, a fan volute 8, a flow equalizing device and other structures are fixedly installed between the middle partition 12 and the top plate 11. When the fan filter unit is in operation, as shown in FIG. Figure 3 As shown by the middle arrow, the external air passes through the protective mesh cover 5 and flows into the interior of the box body 1 from the air inlet 10, then leaves the impeller of the fan 4 and flows along the inner wall 80 of the fan volute 8, and then flows downward 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.

[0004] However, the existing structure of the fan filter unit has the following defects:

[0005] First, in order to achieve air supply and ensure uniform wind speed on the entire air outlet surface, the box body 1 needs to be equipped with components such as the fan 2, the air guide ring 7, the fan fixing base 9, the middle partition 12, the fan volute 8, and the flow equalization device. The box body 1 is large in size and has many components, which results in a large overall weight of the fan filter unit and high material cost;

[0006] Second, at the construction site, the fan filter unit needs to be installed on the ceiling by manpower. Due to the heavy weight of the fan filter unit, the transportation cost and installation cost of installing it on the ceiling are high.

[0007] Third, in terms of wind speed uniformity across the entire air outlet surface, limited by the design of the existing structure, the wind speed uniformity of the existing fan filter unit is basically maintained at a standard level, and there is little room for further improvement. Summary of the invention

[0008] The object of the present invention is to provide a volute flow guide mechanism of a fan and an air supply unit of a fan filter unit to solve the problems of wind speed uniformity and high cost of the fan filter unit in the prior art.

[0009] To achieve the above-mentioned object of the invention, one embodiment provides a volute flow guide mechanism for a fan, comprising:

[0010] A volute, comprising a surrounding wall with a vertical central axis, a top shell located above the surrounding wall and a suction port formed in the top shell, wherein the inner wall surface of the volute encloses a volute air chamber capable of accommodating a fan impeller;

[0011] The guide structure extending downward from the surrounding wall defines an air duct connected to the volute wind chamber, and the air duct has a centrifugal air outlet and a centripetal air outlet; at the centrifugal air outlet, the air duct extends outward away from the central axis to guide the airflow to flow outward away from the central axis; at the centripetal air outlet, the air duct opens inward toward the central axis to guide the airflow to flow inward toward the central axis.

[0012] Further preferably, the number of the guide structures is set to two, three, four or more, and all the guide structures are set to have the same structure and are evenly arranged around the central axis.

[0013] Further preferably, the air guide structure has a partition wall, and 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.

[0014] Further preferably, the flow guiding structure further comprises:

[0015] An outer guide wall defining an outer boundary of the air duct, which extends outwardly in a curved line from an inner wall surface of the volute around the central axis;

[0016] An inner guide wall defining an inner boundary of the air duct;

[0017] A bottom guide wall defining the lower boundary of the air duct, which, together with the outer guide wall and the inner guide wall, encloses the centrifugal air outlet; and

[0018] A top guide wall defining an upper boundary of the air duct, connecting the outer guide wall and the inner wall surface of the volute, and extending obliquely downward around the central axis;

[0019] Wherein, the partition wall protrudes inward from the outer guide wall, is located between the top guide wall and the bottom guide wall and connected to the bottom guide wall, and the centripetal air outlet is opened between the inner edge of the partition wall and the inner edge of the bottom guide wall.

[0020] Further preferably, a portion of the flow guide structure is integrally formed with the volute to construct a first structural member, and the first structural member has a groove recessed inside thereof and a clamping portion formed at the groove;

[0021] The remaining part of the guide structure is configured as an integrally formed second structural member, which is assembled and connected to the first structural member, and includes the bottom guide wall, the partition wall and part of the outer guide wall, and the second structural member is fitted into the groove and has a matching portion that is mutually limited with the clamping portion on the circumference of the central axis, and one of the clamping portion and the matching portion is a clamping groove and the other is a protrusion.

[0022] Compared with the prior art, one embodiment of the present invention has the following beneficial effects: on the one hand, by setting the volute and the guide structure, and combining the setting of the centrifugal air outlet and the centripetal air outlet, the wind speed uniformity can be ensured, thereby further reducing the number and weight of structural parts required for the air supply unit of the fan filter unit, so that the material cost, transportation cost and installation cost of the whole machine are greatly reduced, the cost reduction effect is significant, and it has great economic benefits.

[0023] To achieve the above-mentioned purpose of the invention, one embodiment provides an air supply unit of a fan filter unit, comprising:

[0024] A box body, comprising a top plate and an air inlet penetrating the top plate from top to bottom;

[0025] A fan, comprising an impeller mounted above the top plate;

[0026] A volute mounted above the top plate, which surrounds a volute air chamber accommodating the impeller, and a suction port is provided at the top of the volute;

[0027] an air guide ring, which is located between the volute and the impeller to connect the air inlet and the suction port of the fan; and

[0028] The guide structure arranged at the air inlet defines an air duct connected to the volute air chamber, and the air duct has a centrifugal air outlet and a centripetal air outlet located below the top plate; at the centrifugal air outlet, the air duct extends outward away from the central axis of the impeller to guide the airflow to flow outward away from the central axis; at the centripetal air outlet, the air duct opens inward toward the central axis to guide the airflow to flow inward toward the central axis.

[0029] Further preferably, the number of the guide structures is set to two, three, four or more, and all the guide structures are set to have the same structure and are evenly arranged around the central axis.

[0030] Further preferably, the air supply unit of the fan filter unit also includes an air guide plate fixed under the top plate, the air guide plate extends radially on opposite sides of the central axis, and protrudes downward from the top plate to a bottom end which is no higher than the bottom end of the centripetal air outlet.

[0031] Further preferably, the innermost end of each of the centrifugal air outlets is located on a first circle with the central axis as the center; the innermost end of each of the centripetal air outlets is located on a second circle with the central axis as the center;

[0032] The distance from the outer end of the air guide plate to the central axis is not less than the radius of the first circle and / or not less than the radius of the second circle.

[0033] Further preferably, the fan is configured as a centrifugal fan, which includes a motor driving the blades of the impeller to rotate around the central axis;

[0034] The top plate also has:

[0035] A vertically penetrating installation passage is provided for the motor to be installed from top to bottom inside the box; and

[0036] A plurality of reinforcing ribs, wherein one of the reinforcing ribs is divided into two sections located at both sides of the installation channel, and the air guide plate spans the installation channel and is fastened to the two sections of the reinforcing ribs.

[0037] Further preferably, the motor is supported on the air guide plate;

[0038] The air guide plate includes two plates arranged opposite to each other in a V shape. The two plates are inclined toward each other from top to bottom and a gap is formed between the two plates for the wire of the motor to extend.

[0039] Further preferably, the guide structure includes a bottom guide wall defining the lower boundary of the air duct; at the centrifugal air outlet, the bottom guide wall is arranged horizontally or obliquely upward so that the airflow leaves the centrifugal air outlet horizontally or obliquely upward.

[0040] Further preferably, the air guide structure has a partition wall, and 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.

[0041] Further preferably, the flow guiding structure further comprises:

[0042] An outer guide wall defining an outer boundary of the air duct, which extends outwardly in a curved line from an inner wall surface of the volute around the central axis;

[0043] An inner guide wall defining an inner boundary of the air duct;

[0044] The bottom guide wall defining the lower boundary of the air duct is also provided with a plurality of small holes extending vertically, and the lower guide wall, the outer guide wall and the inner guide wall together enclose the centrifugal air outlet; and,

[0045] The top guide wall defining the upper boundary of the air duct connects the outer guide wall and the inner wall surface of the volute and extends obliquely downward around the central axis; the partition wall protrudes inward from the outer guide wall, is located between the top guide wall and the bottom guide wall and is connected to the bottom guide wall, and the centripetal air outlet is provided between the inner edge of the partition wall and the inner edge of the bottom guide wall.

[0046] Further preferably, a portion of the flow guide structure is integrally formed with the volute to construct a first structural member, the edges around the lower end of the first structural member are sealed and mounted on the upper surface of the top plate, and the first structural member has a groove recessed inside thereof and a clamping portion formed at the groove;

[0047] The rest of the guide structure is configured as an integrally formed second structural member, the upper portion of which is assembled and connected to the first structural member and fits into the groove, and the lower portion of which extends from top to bottom through the air inlet into the interior of the box;

[0048] Furthermore, the second structural member has a matching portion which is mutually limited with the clamping portion on the circumference of the central axis, and one of the clamping portion and the matching portion is a clamping groove and the other is a protrusion.

[0049] Compared with the prior art, one embodiment of the present invention has the following beneficial effects: on the one hand, by setting the volute and the guide structure, and combining the setting of the centrifugal air outlet and the centripetal air outlet, the uniformity of the wind speed can be ensured, thereby further reducing the number and weight of the structural parts required for the air supply unit of the fan filter unit, so that the material cost, transportation cost and installation cost of the whole machine are greatly reduced; on the other hand, by arranging the impeller, volute and air guide ring above the top plate, the box body does not need to be set to a larger volume to accommodate the impeller, air guide ring, volute and other structures, so that the height of the box body is greatly reduced, and the material cost and weight of the box body itself are reduced, the cost reduction effect is significant, and it has great economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of an existing fan filter unit;

[0051] Figure 2 It is a schematic diagram of the internal structure of the air supply unit of an existing fan filter unit;

[0052] Figure 3 It is a structural exploded view of the air supply unit of an existing fan filter unit;

[0053] Figure 4 It is a schematic structural diagram of a fan filter unit according to one embodiment of the present invention;

[0054] Figure 5 is a schematic structural diagram of an air supply unit according to Embodiment 1 of the present invention;

[0055] Figure 6 is a schematic diagram of a lower side view of an air supply unit according to Embodiment 1 of the present invention;

[0056] Figure 7a is a structural exploded view of the air supply unit of Example 1 of the present invention;

[0057] Figure 7b is another structural exploded view of the air supply unit of Example 1 of the present invention;

[0058] Figure 8 is a three-dimensional diagram of a volute flow guide mechanism of a fan according to Embodiment 1 of the present invention;

[0059] Figure 9a yes Figure 8 Partial exploded view of the volute flow guide mechanism of the medium-speed blower;

[0060] Figure 9b yes Figure 8 Another partial exploded view of the volute flow guide mechanism of the medium-pressure blower;

[0061] Fig.10 is a partial structural perspective view of an air supply unit according to Embodiment 1 of the present invention;

[0062] Fig.11 is a bottom view of the air supply unit of Embodiment 1 of the present invention;

[0063] Fig.12 is a schematic structural diagram of an air supply unit according to Embodiment 2 of the present invention;

[0064] Fig.13 is a schematic diagram of a lower side view of an air supply unit according to Embodiment 2 of the present invention;

[0065] Fig.14a is a structural exploded view of an air supply unit according to Embodiment 2 of the present invention;

[0066] Fig.14b is another structural exploded view of the air supply unit of Embodiment 2 of the present invention;

[0067] Fig.15 is a three-dimensional diagram of some components (including a box body, an air guide plate, a flow guide structure, etc.) of an air supply unit according to Embodiment 2 of the present invention;

[0068] Fig.16 is a top view of an air supply unit according to Embodiment 2 of the present invention;

[0069] Fig.17a yes Fig.16 The cross-sectional structure diagram along the BB line;

[0070] Fig.17b yes Fig.16 The cross-sectional structure diagram along the DD line;

[0071] Fig.18 It is a bottom view of the air supply unit of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0072] The following will describe the implementation of the present invention in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these implementations are all within the scope of protection of the present invention.

[0073] See also Figure 4 , which illustrates a fan filter unit 100. The fan filter unit 100 includes an air supply unit and a filter 3. The air supply unit includes a box body 1 and a fan 2 assembled on the box body 1.

[0074] The box body 1 includes a horizontally arranged rectangular top plate 11, a vertically arranged rectangular cylindrical side plate 12, and an air inlet 110 that passes through the top plate 11 from top to bottom. The top plate 11 is located on the top of the side plate 12, and the two can be integrally formed by a sheet metal bending process; the top plate 11 and the side plate 12 enclose an inner cavity 10 of the box body 1, and the bottom of the inner cavity 10 is an open opening design. The filter 3 can be fixedly installed under the box body 1 under the limiting guidance of the filter baffle 30, and the filter 3 is sealed and docked to the inner cavity 10 of the box body 1. In this way, when the fan filter unit 100 is running, under the action of the fan 2, the airflow can enter the inner cavity 10 of the box body 1 from the air inlet 110, and finally when it leaves the inner cavity 10 downward, it must pass through the filter 3 to be effectively filtered and purified.

[0075] As mentioned in the background technology, based on the structural design of the air supply unit, the existing traditional fan filter unit has problems such as high cost. In this regard, the air supply unit provided by the present invention solves the cost problem well through structural optimization design, and can further ensure the uniformity of wind speed.

[0076] The specific structure and beneficial effects of the air supply unit of the present invention are described in detail below in conjunction with specific embodiments.

[0077] Example 1

[0078] Combine the following Figure 4 , and participate Figures 5 to 11 , yet another embodiment of the air supply unit is introduced in detail.

[0079] As mentioned above, the air supply unit includes a box body 1 and a fan 2. Figure 7a and Figure 7b The fan 2 includes a motor 22 and an impeller 21. The impeller 21 is mounted above the top plate 11 and has a central axis O (reference numeral 22). Fig.11 ), which specifically includes a plurality of blades 211, a curved upper cover plate 212 located above the blades 211, and a flat lower cover plate 213 located below the blades 211; the lower cover plate 213 is located above the top plate 11; and the blades 211 can rotate around the central axis O driven by the motor 22, thereby driving the air flow to form the air flow of the air supply unit; the inner edge 2120 of the upper cover plate 212 surrounds an air inlet 20, and when the blades 211 rotate, the air flow can flow from the air inlet 20 to the blades 211.

[0080] The air supply unit also includes a volute flow guide mechanism for guiding the airflow formed by the fan 2. Figures 5 to 9b The volute flow guiding mechanism specifically includes a volute 5, an air guiding ring 55 and a flow guiding structure 7.

[0081] The volute 5 is installed above the top plate 11 and encloses a volute air chamber 50, in which the impeller 21 is accommodated; and a suction port is provided at the top of the volute 5, and an air guide ring 55 is located between the volute 5 and the impeller 21 to connect the suction port and the air inlet 20 of the fan 2. Thus, when the fan 2 is turned on, as the blades 211 rotate, the external air above the volute 5 passes downward through the suction port, and then under the guidance of the air guide ring 55, the airflow flows from the suction port to the air inlet 20 of the fan 2, and then flows along the surface of the blades 211 until it leaves the blades 211 and flows in the volute air chamber 50.

[0082] Thus, compared with the prior art, in this embodiment, by arranging the impeller 21, the volute 5, and the air guide ring 55 above the top plate 1, the box body 1 does not need to be set to a larger volume in order to accommodate the impeller 21, the air guide 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 weight of the box body 1 itself are reduced; and the impeller 21, the volute 5 and the like are directly supported on the top plate 11, and the inner cavity 10 of the box body 1 can save the following parts relative to the prior art. Figure 1-3The middle partition 12, the fan fixing base 9, etc. in the embodiment can further reduce the material cost and weight; in addition, based on the weight reduction, when the fan filter unit 100 is installed on the ceiling through the handle 6, the transportation cost and installation cost are also reduced accordingly. That is, overall, the air supply unit of this embodiment has the advantage of greatly reducing the cost of the fan filter unit.

[0083] Furthermore, in the present application, the guide structure 7 is disposed at the air inlet 110 to guide the flow of air.

[0084] Specifically, the flow guide structure 7 defines an air duct 70. The air duct 70 is connected to the volute air cavity 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 housing 1. Therefore, when the fan 2 is turned on, the airflow in the volute air cavity 50 can flow into the air duct 70, and after leaving the air duct 70 through the centrifugal air outlet 701, it flows in the inner cavity 10.

[0085] At the centrifugal air outlet 701, the air duct 70 extends outward away from the central axis O. Fig.11 As shown, at the centrifugal air outlet 701, under the guidance of the air duct 70, the air flow f1 basically flows outward away from the central axis O and leaves the guide structure 7. In this way, by setting the guide structure 7, the air supply direction can be controlled. Combined with the above-mentioned settings of the fan 2, the volute 5, and the air guide ring 55, not only can the cost be reduced, but also the basic requirements for wind speed uniformity in the industry can be met at a low cost, avoiding the situation where the wind speed uniformity does not meet the standard due to cost reduction.

[0086] Specifically, the volute 5 includes a top shell 51 that roughly covers the impeller 21 and a surrounding wall 52 that surrounds the impeller 21. Accordingly, the volute air chamber 50 is specifically formed above the top plate 11, inside the surrounding wall 52, and below the top shell 51. The impeller 21 is located above the top plate 11, inside the surrounding wall 52, and below the top shell 51.

[0087] The suction port is arranged at the center of the top shell 51, that is, the suction port is arranged at the center of the top of the volute 5, and the top shell 51 is roughly an annular horizontal plate arranged around the suction port. A mesh grille 53 is arranged at the suction port to prevent large foreign objects from entering the suction port and causing damage to the fan 2. The grille 53 can be integrally formed with the top shell 51, or can be separately formed and assembled on the top shell 51.

[0088] The air guide ring 55 is connected to the inner edge of the top shell 51, and extends inward and downward in an arc shape from the top shell 51, and then extends vertically downward. 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 side of the inner edge 2120 of the upper cover plate 212 of the impeller 21, thereby, the air guide ring 55 connects the suction port and the air inlet 20 of the fan 2.

[0089] More preferably, the air guide ring 55 can be integrally formed with the top shell 51 of the volute 5 to reduce the assembly process, increase the production speed of the fan filter unit 100, reduce assembly seams, ensure sealing, and improve the air supply efficiency of the whole machine.

[0090] Preferably, in this embodiment, the inner wall surface of the volute 5 is provided with a plurality of reinforcing ribs 56 , and these reinforcing ribs 56 are divergently arranged around the air guide ring 55 to increase the structural strength of the volute 5 and avoid damage caused by people stepping on it.

[0091] Furthermore, at the centrifugal air outlet 701 , under the guidance of the air guide structure 7 , the airflow f1 leaves the air duct 70 substantially horizontally or slightly obliquely upwards, thereby further ensuring the uniformity of the wind speed.

[0092] Furthermore, in the present embodiment, the air duct 70 also 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 box body 1, thereby, when the fan 2 is turned on, the airflow in the volute air cavity 50 can flow into the air duct 70, and after leaving the air duct 70 through the centripetal air outlet 702, flow in the inner cavity 10.

[0093] The centripetal air outlet 702 is formed on the inner side of the air duct 70, or on the inner side of the air guide structure 7 close to the central axis O. Fig.11 As shown, the air duct 70 opens inwardly toward the central axis O to guide the air flow f3 to flow inwardly toward the central axis O. In this way, through the combination of the centripetal air outlet 702 and the centrifugal air outlet 701, the guide structure 7 can simultaneously realize the outward delivery of air away from the central axis O and the inward delivery of air toward the central axis O, thereby ensuring the uniformity of wind speed in the inner cavity 10 of the box body 1, which greatly improves the uniformity of wind speed compared with the air outlet method of the prior art and far exceeds the industry standard; in addition, combined with the above-mentioned 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 achieved at a low cost, avoiding the situation where the wind speed uniformity is poor due to the cost reduction.

[0094] Further, in this embodiment, the guide structure 7 is located at the 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 intersects with the volute air chamber 50 at the side of the impeller 21, and extends obliquely downward and outward to the centrifugal air outlet 701 located below the top plate 11. In this way, the airflow in the volute air chamber 50 enters the air duct 70 at the side of the impeller 21, flows along the air duct 70 until it leaves the air duct 70 from the centrifugal air outlet 701 and enters the inner cavity 10 of the housing 1.

[0095] The fan 2 is configured as a centrifugal fan, and its lower cover plate 213 is a closed type (i.e., it has no exhaust port), and the exhaust port of the fan 2 is formed around the blade 211, that is, between the outer edge of the upper cover plate 212 and the outer edge of the lower cover plate 213. Therefore, when the fan 2 is turned on, the airflow flows along the surface of the blade 211, and then leaves the blade 211 and is thrown around the impeller 21 along the tangential direction to the inner wall surface of the volute 5, and enters the air duct 70.

[0096] More preferably, the inner wall surface 520 of the surrounding wall 52 is configured to form a partial inner wall surface of the volute 5. In this embodiment, the surrounding wall 52 is coaxially arranged with the impeller 21, and the horizontal cross-section of the inner wall surface 520 is generally a circle or a multi-segment arc shape with the central axis O of the impeller 21 as the center. In this way, when the fan 2 is turned on, after the airflow leaves the blades 211, the airflow can flow smoothly along the inner wall surface 520. Of course, in a variant embodiment, the shape of the surrounding wall 52 is not limited to this.

[0097] Furthermore, regarding the specific structure of the flow guide structure 7 , in the present embodiment, the flow guide structure 7 further includes an inner flow guide wall 74 , an outer flow guide wall 71 , a top flow guide wall 73 , a bottom flow guide wall 72 and a partition wall 75 .

[0098] Among them, 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. That is, after the airflow in the volute air chamber 50 enters the centrifugal air duct 70a, it all leaves the air duct 70 through the centrifugal air outlet 701, and after the airflow in the volute air chamber 50 enters the centripetal air duct 70b, it all leaves the air duct 70 through the centripetal air outlet 702. Therefore, by setting the centrifugal air duct 70a and the centripetal air duct 70b independently of each other, the reasonable distribution of the airflow can be achieved, and the uniformity of the wind speed can be further enhanced.

[0099] The outer guide wall 71 , the inner guide wall 74 and the bottom guide wall 72 surround the centrifugal air outlet 701 .

[0100] Specifically, the outer guide wall 71 defines the outer boundary of the air duct 70 (i.e., the boundary on the side away from the central axis O); the outer guide wall 71 is parallel to the vertical direction, and extends outwardly around the central axis O from the inner wall surface 520 of the volute 5, that is, in the circumferential direction of the central axis O, the distance from the outer guide wall 71 to the central axis O gradually increases along the air flow direction. 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 gradually increases, so as to achieve outward airflow at the centrifugal air outlet 701.

[0101] Opposite to the outer guide wall 71 , the inner guide wall 74 defines the inner boundary of the air duct 70 (ie, the boundary on the side close to the central axis O), which is arranged below the top plate 11 and specifically defines the inner boundary of the centrifugal air duct 70a.

[0102] The bottom guide wall 72 defines the lower boundary of the air outlet 70. In the present embodiment, at the centrifugal air outlet 701, the bottom guide wall 72 is arranged to be horizontal along the airflow direction, so that the airflow can leave the centrifugal air outlet 701 horizontally instead of blowing directly downwardly to the filter, ensuring that the airflow passes through the filter at a uniform speed after being fully circulated in the inner cavity 10 of the box body 1, further improving the wind speed uniformity of the air supply unit in the present embodiment. In a variant embodiment, at the centrifugal air outlet 701, the bottom guide wall 72 can also be arranged to be slightly obliquely upward along the airflow direction, so that the airflow can leave the centrifugal air outlet 701 slightly obliquely upward instead of blowing directly downwardly to the filter, and can also ensure that the airflow passes through the filter at a uniform speed after being fully circulated in the inner cavity 10 of the box body 1, further improving the wind speed uniformity of the air supply unit.

[0103] Opposite to the bottom guide wall 72, the top guide wall 73 defines the upper boundary of the air duct 70, protrudes outward from the inner wall surface 520 of the volute 5, and connects the upper edge of the outer guide wall 71 and the inner wall surface 520 of the volute 5. In addition, the top guide wall 73 extends obliquely downward around the central axis O to guide the airflow gradually downward.

[0104] In addition, it can be seen from the above that 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 centripetal air duct 70b.

[0105] Specifically, the partition wall 75 protrudes inward from the outer guide wall 71, and is located between the top guide wall 74 and the bottom guide wall 72 and connected to 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., a 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., a portion 71' of the outer guide wall 71) jointly define a centripetal air duct 70b.

[0106] An opening is provided between the inner edge of the partition wall 75 and the inner edge of the bottom guide wall 72, the upper portion of the opening is located above the top plate 11 and forms a centripetal air inlet 703 of the centripetal air duct 70b, and the lower portion of the opening is located below the top plate 11 and forms a centripetal air outlet 702 of the centripetal air duct 70b. As described above, by providing the partition wall 75, the guide structure 7 has the advantages of being simple in structure and being conducive to optimizing the uniformity of wind speed.

[0107] Further preferably, in this embodiment, a part of the flow-guiding structure 7 is integrally formed with the volute 5 to construct a first structural member 57a, and the edges around the lower end of the first structural member 57a are sealed and installed on the upper surface of the top plate 11 through flanges 54; wherein the flanges 54 can be fastened to the top plate 11 through a screw structure, which is convenient for assembly. At the same time, the remaining part of the flow-guiding structure 7 is set as an integrally formed second structural member 57b, and the lower part of the second structural member 57b extends from top to bottom through the air inlet 110 into the inner cavity 10 of the box body 1, and is sealed and installed on the upper surface of the top plate 11 through flanges 79; wherein the flanges 79 can be fastened to the top plate 11 through a screw structure, which is convenient for assembly. Therefore, by setting the first structural member 57a and the second structural member 57b, not only the processing and forming of the single structural member is facilitated and the difficulty of processing and forming is avoided, but also the good sealing effect of the volute air cavity 50, the air duct 70, etc. can be ensured.

[0108] More preferably, the second structural member 57b generally includes a bottom guide wall 72, a partition wall 75 and a part of the outer guide wall 71, which is assembled and connected to the first structural member 57a. In detail, the first structural member 57a has a groove 77 recessed in its inner side and a clamping portion 770 formed at the groove 77; and the second structural member 57b is matched with the groove 770, and it has a matching portion 771; one of the matching portion 771 and the clamping portion 770 is a vertical slot and the other is a convex block. In this embodiment, the clamping portion 770 is a slot and the matching portion 771 is a convex block. When the second structural member 57b is matched with the groove 770, the matching portion 771 and the clamping portion 770 are mutually limited on the circumference of the central axis O, thereby limiting the rotation of the second structural member 57b relative to the first structural member 57a around the central axis O, which can achieve mutual limitation on the one hand, and guide during the assembly process on the other hand, which is convenient for installation.

[0109] As described above, the specific implementation manners of the volute 5 and the flow guiding structure 7 have the advantages of simple structure, convenient assembly, and being conducive to optimizing the wind speed uniformity. Of course, in variant embodiments, the specific structures of the flow guiding structure 7 and the volute 5 are not limited thereto.

[0110] Furthermore, the air supply unit includes two or more flow guiding structures 7 that are evenly and repeatedly arranged around the central axis O. That is, the number of the flow guiding structures 7 is set to two, three, four, or more. These flow guiding structures 7 are set to have the same structure and are evenly arranged around the central axis O. Thus, by simultaneously discharging air into the inner cavity 10 of the box body 1 through two or more air ducts 70, the wind speed uniformity of the air discharged into the inner cavity 10 can be further improved. In this embodiment, the number of the flow guiding structures 7 is set to 4. The centrifugal air outlets 701 of the 4 flow guiding structures 7 are respectively located in the "field" - shaped four - partition areas of the rectangular inner cavity 10. That is, the rectangular inner cavity 10 is divided into four equal rectangular partitions according to the "field" shape, and each partition has 1 centrifugal air outlet 701 and 1 centripetal air outlet 702.

[0111] Corresponding to the number of the flow guiding structures 7, the box body 1 has two or more air inlets 110 that are repeatedly arranged around the central axis O. 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 - partition areas of the rectangular top plate 11.

[0112] Furthermore, the minimum distance R between all the centrifugal air outlets 701 and the central axis O is 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 a radius of R. Similarly, the minimum distance R2 between all the centripetal air outlets 702 and the central axis O is all the same. That is, the innermost ends 7022 of all the centripetal air outlets 702 are located on the same circle C2 with the central axis O as the center and a radius of R2.

[0113] And the air supply unit further includes a wind guiding plate 8 fixed below the top plate 11. The wind guiding plate 8 protrudes downward from the top plate 11 and extends radially on both opposite sides of the central axis O. In this way, through the setting of the wind guiding plate 8, on the one hand, the air flow f3 blown out from the centripetal air outlet 702 is guided by the wind guiding plate 8 to flow downward, thereby further balancing the wind speeds in the central area 10a and the peripheral area 10b of the inner cavity 10 and further promoting the wind speed uniformity; more beneficially, it can also promote a part of the air flow f2 at the centrifugal air outlet 701 to flow towards the central axis O, so that the wind speed in the area of the circle C relatively increases, and then balance the wind speeds in the central area 10a and the peripheral area 10b of the inner cavity 10, further promoting the wind speed uniformity.

[0114] Preferably, all the centrifugal air outlets 701 and all the centripetal air outlets 702 are evenly distributed on both sides of the wind guiding plate 8. As Fig.11As shown, two of the four centrifugal air outlets 702 (the two above in the figure) are located on one side of the air guide plate 8 (the upper side in the figure, i.e., a semicircular side of circle C2), and the other two of the four centrifugal air outlets 702 (the two below in the figure) are located on the other side of the air guide plate 8 (the lower side in the figure, i.e., the other semicircular side of circle C2); two of the four centrifugal air outlets 701 (the two above in the figure) are located on one side of the air guide plate 8 (the upper side in the figure, i.e., a semicircular side of circle C), and the other two of the four centrifugal air outlets 701 (the two below in the figure) are located on the other side of the air guide plate 8 (the lower side in the figure, i.e., the other semicircular side of circle C).

[0115] Preferably, the bottom end of the air guide plate 8 is lower than the bottom end of the centrifugal air outlet 802, or is flush with the bottom end of the centrifugal air outlet 802. In this way, it can be ensured that after leaving the centrifugal air outlet 802, the airflow f3 can be smoothly blocked by the air guide plate 8, so as to fully realize the air guiding function of the air guide plate 8. Of course, more preferably, the bottom end of the air guide 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. In this way, it can be ensured that after leaving the centrifugal air outlet 701, the airflow f2 can be smoothly blocked by the air guide plate 8, so as to fully realize the air guiding function of the air guide plate 8.

[0116] In this embodiment, the bottom end of the centrifugal air outlet 802, the bottom end of the centrifugal air outlet 702, and the bottom end of the air guide plate 8 are flush with each other. This can save as little material as possible while ensuring the uniformity of the wind speed, reduce the weight of the air supply unit, and further reduce costs.

[0117] Further, the distance between the two outer ends 801 of the air guide plate 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 centrifugal air outlet 702 and the central axis O. In this way, it can be ensured that the air guide plate 8 can fully block and guide part of the airflow f2 at the centrifugal air outlet 701 or the airflow f3 at the centrifugal air outlet 702, so as to achieve a better flow balancing effect.

[0118] Preferably, the distance between the two outer ends 801 of the air guide plate 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.

[0119] In the embodiment of the accompanying drawings, the radius R of circle C is smaller than the radius R2 of circle C2, and the distance between the two outer ends 801 of the air guide plate 8 and the central axis O is larger than the radius R2 of circle C2 and slightly smaller than the maximum distance between the centrifugal air outlet 702 and the central axis O (i.e., the distance between the outermost end 7021 of the centrifugal air outlet 702 and the central axis O). In this way, it can be ensured that the air guide plate 8 can fully block and guide the partial airflow f2 at the centrifugal air outlet 701 and the airflow f3 at the centrifugal air outlet 702 to achieve the maximum flow balancing effect.

[0120] In this embodiment, the air guide plate 8 is generally V-shaped, and includes a first plate 81 and a second plate 82 that are arranged opposite to each other. The first plate 81 and the second plate 82 are arranged to be inclined toward each other from top to bottom, so that the airflow f2 can present a downward trend when flowing on the surface of the first plate 81 and the second plate 82, thereby achieving a smooth flow of the airflow.

[0121] The respective lower edges of the first plate 81 and the second plate 82 are connected via a horizontal third plate 83, which forms the bottom end of the air guide plate 8; of course, in a variant embodiment, the respective lower edges of the first plate 81 and the second plate 82 may also be directly connected.

[0122] Further, the motor 22 of the fan 2 is arranged below the impeller 21, and its output shaft is connected to the impeller 21 to drive the blades 211 to rotate around the central axis O. Preferably, the motor 22 is coaxially arranged with the impeller 21. In the present embodiment, the motor 22 is arranged below the top plate 11 of the housing 1. Specifically, a mounting channel 111 is formed at the center of the top plate 11, and the mounting channel 111 passes through the top plate 11 from top to bottom, and its size and shape are set to allow the motor 22 to pass through up and down, but not allow the impeller 21 to pass through up and down. Therefore, when installing the fan 2 on the housing 1, the motor 22 can be passed through the mounting channel 111 from top to bottom and moved to the bottom of the top plate 11. At the same time, the upper flange of the motor 22 supports and presses against the bracket 13 of the top plate 11, and then the lower cover plate 213 is fixed by screws, buckles or other fasteners, so that the installation of the fan 2 can be completed, which is simple, fast and convenient.

[0123] Furthermore, the air guide plate 8 is arranged across the installation channel 111. On the one hand, the motor 22 can be supported and fixed on the air guide plate 8, thereby achieving stability of the motor 22; on the other hand, the air guide plate 8 is fixedly connected to the top plate 11 on opposite sides of the installation channel 111, so that the structural strength of the top plate 11 can be further strengthened by the pulling effect of the air guide plate 8. As shown in the drawings of the embodiment, the top plate 11 includes a plurality of reinforcing ribs 15, one of which is divided into two sections (such as label 151) located on opposite sides of the installation channel 111, and the air guide plate 8 and the two sections of reinforcing ribs 151 are fastened and installed by screws, thereby greatly enhancing the strength of the top plate 11.

[0124] Furthermore, the air guide 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, which is electrically connected to the motor 22 through a wire to control the motor 22. In this embodiment, the controller 4 is arranged near the outer end 801 of the air guide plate 8; the wire is arranged in the gap 80, and can be specifically routed from the motor 22 along the gap 80 until it extends from the outer end 801 of the air guide plate 8, and then connected to the controller 4. In this way, through the structural design and position design of the air guide plate 8, it is convenient to route the wires of the motor 22, cancel the existing wire fixing structure, further reduce costs, and facilitate assembly.

[0125] In addition, in an optional embodiment, in order to further ensure the uniformity of wind speed and avoid the wind speed being too low directly below the bottom guide wall 72, a plurality of small holes penetrating the bottom guide wall 72 from top to bottom may be provided to facilitate the delivery of less airflow directly below the bottom guide wall 72. It is understandable that the area of ​​these small holes is much smaller than the area of ​​the centrifugal air outlet 701 and much smaller than the area of ​​the centripetal air outlet 702.

[0126] In summary, compared with the prior art, the present embodiment has the following beneficial effects: on the one hand, by arranging the impeller 21, the volute 5, and the air guide ring 55 above the top plate 1, the box body 1 does not need to be set to a larger volume in order to accommodate the impeller 21, the air guide ring 55, the volute 5 and other structures, so that the height of the box body 1 is greatly reduced, reducing the material cost and weight of the box body 1 itself; and the number and weight of the required structural parts are greatly reduced, so that the material cost, transportation cost, and installation cost of the whole machine are greatly reduced, and the cost reduction effect is significant, with great economic benefits; on the other hand, while achieving cost reduction, the wind speed uniformity is ensured by the setting of the guide structure 7, and further combined with the setting of the air guide plate 8, the wind speed uniformity is greatly improved; on the other hand, the overall installation of the air supply unit is simple and fast, thereby improving production efficiency.

[0127] Example 2

[0128] Combine the following Figure 4 , and participate Figures 12 to 18 , the third embodiment of the air supply unit is introduced in detail.

[0129] As mentioned above, the air supply unit includes a box body 1 and a fan 2. Fig.14a and Fig.14b The fan 2 includes a motor 22 and an impeller 21. The impeller 21 is mounted above the top plate 11 and has a central axis O (reference numeral 22). Fig.18), which specifically includes a plurality of blades 211, a curved upper cover plate 212 located above the blades 211, and a flat lower cover plate 213 located below the blades 211; the lower cover plate 213 is located above the top plate 11; and the blades 211 can rotate around the central axis O driven by the motor 22, thereby driving the air flow to form the air flow of the air supply unit; the inner edge 2120 of the upper cover plate 212 surrounds an air inlet 20, and when the blades 211 rotate, the air flow can flow from the air inlet 20 to the blades 211.

[0130] The air supply unit specifically includes a volute 5 , an air guide ring 55 and a flow guide structure 7 .

[0131] The volute 5 is installed above the top plate 11 and encloses a volute air chamber 50, in which the impeller 21 is accommodated; and a suction port is provided at the top of the volute 5, and an air guide ring 55 is located between the volute 5 and the impeller 21 to connect the suction port and the air inlet 20 of the fan 2. Thus, when the fan 2 is turned on, as the blades 211 rotate, the external air above the volute 5 passes downward through the suction port, and then under the guidance of the air guide ring 55, the airflow flows from the suction port to the air inlet 20 of the fan 2, and then flows along the surface of the blades 211 until it leaves the blades 211 and flows in the volute air chamber 50.

[0132] Thus, compared with the prior art, in this embodiment, by arranging the impeller 21, the volute 5, and the air guide ring 55 above the top plate 1, the box body 1 does not need to be set to a larger volume in order to accommodate the impeller 21, the air guide 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 weight of the box body 1 itself are reduced; and the impeller 21, the volute 5 and the like are directly supported on the top plate 11, and the inner cavity 10 of the box body 1 can save the following parts relative to the prior art. Figure 1-3 The middle partition 12, the fan fixing base 9, etc. in the embodiment can further reduce the material cost and weight; in addition, based on the weight reduction, when the fan filter unit 100 is installed on the ceiling through the handle 6, the transportation cost and installation cost are also reduced accordingly. That is, overall, the air supply unit of this embodiment has the advantage of greatly reducing the cost of the fan filter unit.

[0133] Specifically, the fan 2 is configured as a centrifugal fan, and its lower cover plate 213 is a closed type (i.e., it has no exhaust port), and the exhaust port of the fan 2 is formed around the blade 211, that is, between the outer edge of the upper cover plate 212 and the outer edge of the lower cover plate 213. Therefore, when the fan 2 is turned on, the airflow flows along the surface of the blade 211, and then leaves the blade 211 and is thrown around the impeller 21 along the tangential direction to the inner wall surface of the volute 5.

[0134] The volute 5 includes a top shell 51 that roughly covers the impeller 21 and a surrounding wall 52 that surrounds the impeller 21. Accordingly, the volute air chamber 50 is specifically formed above the top plate 11, inside the surrounding wall 52, and below the top shell 51. The impeller 21 is located above the top plate 11, inside the surrounding wall 52, and below the top shell 51.

[0135] In this embodiment, the surrounding wall 52 is coaxially arranged with the impeller 21 , and the horizontal cross-section of the inner wall surface 520 thereof is substantially circular with the central axis O of the impeller 21 as the center.

[0136] The suction port is provided at the center of the top shell 51, that is, the suction port is provided at the center of the top of the volute 5, and the top shell 51 is generally an annular horizontal plate provided around the suction port. A mesh grille is provided at the suction port to prevent large foreign objects from entering the suction port and causing damage to the fan 2. The grille can be integrally formed with the top shell 51, or can be separately formed and assembled on the top shell 51.

[0137] The air guide ring 55 is connected to the inner edge of the top shell 51, and extends inward and downward in an arc shape from the top shell 51, and then extends vertically downward. 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 side of the inner edge 2120 of the upper cover plate 212 of the impeller 21, thereby, the air guide ring 55 connects the suction port and the air inlet 20 of the fan 2.

[0138] More preferably, the air guide ring 55 can be integrally formed with the top shell 51 of the volute 5 to reduce the assembly process, increase the production speed of the fan filter unit 100, reduce assembly seams, ensure sealing, and improve the air supply efficiency of the whole machine.

[0139] Further, regarding the guide structure 7, in this embodiment, the guide structure 7 is arranged at the air inlet 110, specifically arranged below the air inlet 110, that is, arranged in the inner cavity 10 of the box body 1. The guide structure 7 defines an air duct 70, and the air duct 70 is formed between the guide structure 7 and the air inlet 110. Fig.18 When the fan 2 is turned on, the airflow in the volute air chamber 50 can enter the air duct 70 through the air inlet 110 .

[0140] First, the air duct 70 has a centrifugal air outlet 701, at which, under the guidance of the flow guide structure 7, the air flow f1 flows outward away from the central axis O. In this way, by setting the flow guide structure 7, the air supply direction can be controlled, and combined with the above-mentioned setting of the fan 2, the volute 5, and the air guide ring 55, not only can the cost be reduced, but also the basic requirements for wind speed uniformity in the industry can be met at a low cost, avoiding the situation where the wind speed uniformity does not meet the standard due to cost reduction.

[0141] Furthermore, the air duct 70 also has a centripetal air outlet 702 located below the top plate 11. The centripetal air outlet 702 is formed on the inner side of the air duct 70, or on the inner side of the guide structure 7 close to the central axis O. At the centripetal air outlet 702, the reference Fig.18 As shown, the guide structure 7 guides the airflow f2 to flow inwards toward the central axis O. In this way, through the combination of the centripetal air outlet 702 and the centrifugal air outlet 701, the guide structure 7 can simultaneously realize the outward delivery of air away from the central axis O and the inward delivery of air toward the central axis O, thereby ensuring the uniformity of wind speed in the inner cavity 10 of the box body 1. Compared with the air outlet method of the prior art, the uniformity of wind speed is greatly improved, and far exceeds the industry standard.

[0142] Furthermore, the air guide structure 7 includes a bottom air guide wall 72 defining a lower boundary of the air duct 70 .

[0143] At the centrifugal air outlet 701, the bottom guide wall 72 can be arranged to extend obliquely upward away from the central axis O or horizontally as shown in the embodiment of the accompanying drawings. In this way, the airflow can leave the centrifugal air outlet 701 obliquely upward or horizontally instead of blowing directly downward to the filter, thereby ensuring that the airflow passes through the filter at a uniform wind speed after sufficient circulation in the inner cavity 10 of the box body 1, thereby further improving the wind speed uniformity of the air supply unit described in this embodiment.

[0144] At the centripetal air outlet 702, the bottom guide wall 72 can be arranged to extend obliquely downward toward the central axis O or horizontally as shown in the embodiment of the accompanying drawings. In this way, the airflow can leave the centripetal air outlet 702 obliquely downward or horizontally instead of blowing directly downward to the filter, thereby ensuring that the airflow passes through the filter at a uniform wind speed after sufficient circulation in the inner cavity 10 of the box body 1, thereby further improving the wind speed uniformity of the air supply unit described in this embodiment.

[0145] Further, the air inlet 110 is configured as an annular structure surrounding the central axis O; and correspondingly, the bottom guide wall 72 is horizontally placed in the inner cavity 10 of the box body 1, and is configured as an annular plate corresponding to the shape of the air inlet 110. In this embodiment, the air inlet 110 is specifically a circular ring structure, and the bottom guide wall 72 is specifically configured as a circular ring plate. The inner diameter of the bottom guide wall 72 (i.e., the distance from the inner edge 7202 of the bottom guide wall 70 to the central axis O) is smaller than the inner diameter of the air inlet 110, and the outer diameter of the bottom guide wall 72 (i.e., the distance from the outer edge 7201 of the bottom guide wall 70 to the central axis O) is larger than the outer diameter of the air inlet 110. As a result, the projection of the bottom guide wall 72 in the vertical direction completely covers the air inlet 110.

[0146] Furthermore, the bottom guide wall 72 specifically includes a middle plate 720 , an inner guide plate 722 and an outer guide plate 721 .

[0147] The middle plate 720 is horizontally arranged and faces the air inlet 110 in the vertical direction.

[0148] The inner guide plate 722 is connected to the inner edge of the middle plate 720, and constitutes the inner edge portion of the bottom guide wall 72; the inner guide plate 722 defines the lower boundary of the centripetal air outlet 702, and extends horizontally or obliquely downward from the inner edge of the middle plate 720 toward the central axis O, so that the airflow leaves the centripetal air outlet 702 obliquely downward or horizontally.

[0149] The outer guide plate 721 is connected to the outer edge of the middle plate 720, and constitutes the outer edge portion of the bottom guide wall 72; the outer guide plate 721 defines the lower boundary of the centrifugal air outlet 701, and extends horizontally or obliquely upward from the outer edge of the middle plate 720 away from the central axis O, so that the airflow leaves the centrifugal air outlet 701 obliquely upward or horizontally.

[0150] Furthermore, the top plate 11 has a middle area 112 for supporting and fixing the impeller 21, that is, the impeller 21 is fixed on the middle area 112; the middle area 112 is connected to the surrounding area 113 of the top plate 11 through connecting ribs 114; the air inlet 110 is formed between the surrounding area 113 and the middle area 112, and is divided by the connecting ribs 114 into multiple arc structures that are spaced apart from each other and evenly distributed around the central axis O.

[0151] The guide structure 7 also has a vertical wall 77 located between the bottom guide wall 72 and the top plate 11 and between two adjacent sections of the arc structure to divide the air duct 70 into a plurality of sub-air ducts evenly distributed around the central axis O, and each of the sub-air ducts discharges air through a centrifugal air outlet 701 and a centripetal air outlet 702.

[0152] In this embodiment, the number of the connecting ribs 114 is 4, and accordingly, the air inlet 110 is divided into four arc-shaped structures, and accordingly, the number of the vertical walls 77 is also 4. Of course, in a variant embodiment, the number of the connecting ribs 114, the arc-shaped structures, and the vertical walls 77 is not limited thereto.

[0153] Furthermore, two vertical walls 77 extend radially on opposite sides of the central axis O, and the two walls 77 form an air guide plate 8. From another perspective, the air supply unit further includes an air guide plate 8 fixed below the top plate 11, the air guide plate 8 protrudes downward from the top plate 11, and extends radially on opposite sides of the central axis O; the outer end portion of the air guide plate 8, such as Fig.17b The portion between the midpoint segment line X and the outer edge of the air guide plate 8 forms a vertical wall 77 .

[0154] The other two vertical walls 77 extend radially on opposite sides of the central axis O and are arranged crosswise with the air guide plate 8. Thus, the number of the sub-air ducts is set to 4 and is evenly distributed on the circumference of the central axis O.

[0155] Further, the motor 22 of the fan 2 is arranged below the impeller 21, and its output shaft is connected to the impeller 21 to drive the blades 211 to rotate around the central axis O. Preferably, the motor 22 is coaxially arranged with the impeller 21. In the present embodiment, the motor 22 is arranged below the top plate 11 of the housing 1. Specifically, the middle area 112 of the top plate 11 is formed with an installation channel 111 that passes through from top to bottom, and the size and shape of the installation channel 111 are set to allow the motor 22 to pass through up and down, but not allow the impeller 21 to pass through up and down. Therefore, when installing the fan 2 on the housing 1, the motor 22 can be passed through the installation channel 111 from top to bottom and moved to the bottom of the top plate 11. At the same time, the upper flange of the motor 22 is supported and pressed against the middle area 112 of the top plate 11, and then the lower cover plate 213 is fixed by screws, buckles or other fasteners, and the installation of the fan 2 can be completed, which is simple, fast and convenient.

[0156] Furthermore, the air guide plate 8 is arranged across the installation channel 111. On the one hand, the motor 22 can be supported and fixed on the air guide plate 8, so as to achieve stability of the motor 22; on the other hand, through the guiding effect of the air guide plate 8, the circular area surrounded by the inner edge 7202 of the bottom guide wall 72 can be divided into a semicircular area 10a and a semicircular area 10b, so that the air flow f2 is evenly distributed under the guidance of the air guide plate 8; on the other hand, on the opposite sides of the installation channel 111, the air guide plate 8 is fixedly connected to the top plate 11, so that the structural strength of the top plate 11 can be further strengthened by the pulling effect of the air guide plate 8. As shown in the drawings of the embodiment, the top plate 11 includes a plurality of reinforcing ribs 15, one of which is divided into two sections (such as label 151) located on the opposite sides of the installation channel 111, and the air guide plate 8 and the two sections of the reinforcing ribs 151 are fastened and installed by screws, thereby greatly enhancing the strength of the top plate 11.

[0157] In summary, compared with the prior art, the present embodiment has the following beneficial effects: on the one hand, by arranging the impeller 21, the volute 5, and the air guide ring 55 above the top plate 1, the box body 1 does not need to be set to a larger volume in order to accommodate the impeller 21, the air guide ring 55, the volute 5 and other structures, so that the height of the box body 1 is greatly reduced, reducing the material cost and weight of the box body 1 itself; and greatly reducing the number and weight of the required structural parts, so that the material cost, transportation cost, and installation cost of the whole machine are greatly reduced, the cost reduction effect is significant, and it has great economic benefits; on the other hand, while achieving cost reduction, the wind speed uniformity is ensured by setting the guide structure 7, which greatly improves the wind speed uniformity; on the other hand, the overall installation of the air supply unit is simple and fast, thereby improving production efficiency.

[0158] It should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0159] The detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A volute flow guide mechanism for a fan, characterized in that: include: A volute, comprising a surrounding wall with a vertical central axis, a top shell located above the surrounding wall and a suction port formed in the top shell, wherein the inner wall surface of the volute encloses a volute air chamber capable of accommodating a fan impeller; The guide structure extending downward from the surrounding wall defines an air duct connected to the volute wind chamber, and the air duct has a centrifugal air outlet and a centripetal air outlet; at the centrifugal air outlet, the air duct extends outward away from the central axis to guide the airflow to flow outward away from the central axis; at the centripetal air outlet, the air duct opens inward toward the central axis to guide the airflow to flow inward toward the central axis.

2. The volute flow guide mechanism of the fan according to claim 1, characterized in that: The number of the guide structures is set to two, three, four or more, and all the guide structures are set to have the same structure and are evenly arranged around the central axis.

3. The volute flow guide mechanism of the fan according to claim 1, characterized in that: The air guide structure has a partition wall, and 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.

4. The volute flow guide mechanism of the fan according to claim 3, characterized in that: The flow guiding structure also has: An outer guide wall defining an outer boundary of the air duct, which extends outwardly in a curved line from an inner wall surface of the volute around the central axis; An inner guide wall defining an inner boundary of the air duct; A bottom guide wall defining the lower boundary of the air duct, which, together with the outer guide wall and the inner guide wall, encloses the centrifugal air outlet; and A top guide wall defining an upper boundary of the air duct, connecting the outer guide wall and the inner wall surface of the volute, and extending obliquely downward around the central axis; Wherein, the partition wall protrudes inward from the outer guide wall, is located between the top guide wall and the bottom guide wall and connected to the bottom guide wall, and the centripetal air outlet is opened between the inner edge of the partition wall and the inner edge of the bottom guide wall.

5. The volute flow guide mechanism of the fan according to claim 4, characterized in that: A portion of the flow guide structure is integrally formed with the volute to construct a first structural member, wherein the first structural member has a groove recessed inside the first structural member and a clamping portion formed at the groove; The remaining part of the guide structure is configured as an integrally formed second structural member, which is assembled and connected to the first structural member, and includes the bottom guide wall, the partition wall and part of the outer guide wall, and the second structural member is fitted into the groove and has a matching portion that is mutually limited with the clamping portion on the circumference of the central axis, and one of the clamping portion and the matching portion is a clamping groove and the other is a protrusion.

6. An air supply unit of a fan filter unit, characterized in that: include: A box body, comprising a top plate and an air inlet penetrating the top plate from top to bottom; A fan, comprising an impeller mounted above the top plate; A volute mounted above the top plate, which surrounds a volute air chamber accommodating the impeller, and a suction port is provided at the top of the volute; an air guide ring, which is located between the volute and the impeller to connect the air inlet and the suction port of the fan; and The guide structure arranged at the air inlet defines an air duct connected to the volute air chamber, and the air duct has a centrifugal air outlet and a centripetal air outlet located below the top plate; at the centrifugal air outlet, the air duct extends outward away from the central axis of the impeller to guide the airflow to flow outward away from the central axis; at the centripetal air outlet, the air duct opens inward toward the central axis to guide the airflow to flow inward toward the central axis.

7. The air supply unit of the fan filter unit according to claim 6, characterized in that: The number of the guide structures is set to two, three, four or more, and all the guide structures are set to have the same structure and are evenly arranged around the central axis.

8. The air supply unit of the fan filter unit according to claim 7, characterized in that: It also includes an air guide plate fixed below the top plate, the air guide plate extends radially on opposite sides of the central axis, and protrudes downward from the top plate until its bottom end is not higher than the bottom end of the centripetal air outlet.

9. The air supply unit of the fan filter unit according to claim 8, characterized in that: The innermost end of each centrifugal air outlet is located on a first circle with the central axis as the center; the innermost end of each centripetal air outlet is located on a second circle with the central axis as the center; The distance from the outer end of the air guide plate to the central axis is not less than the radius of the first circle and / or not less than the radius of the second circle.

10. The air supply unit of the fan filter unit according to claim 8, characterized in that: The fan is configured as a centrifugal fan, which includes a motor driving the blades of the impeller to rotate around the central axis; The top plate also has: A vertically penetrating installation passage is provided for the motor to be installed from top to bottom inside the box; and A plurality of reinforcing ribs, wherein one of the reinforcing ribs is divided into two sections located at both sides of the installation channel, and the air guide plate spans the installation channel and is fastened to the two sections of the reinforcing ribs.

11. The air supply unit of the fan filter unit according to claim 10, characterized in that: The motor is supported on the wind guide plate; The air guide plate includes two plates arranged opposite to each other in a V shape. The two plates are inclined toward each other from top to bottom and a gap is formed between the two plates for the wire of the motor to extend.

12. The air supply unit of the fan filter unit according to claim 7, characterized in that: The guide structure includes a bottom guide wall defining the lower boundary of the air duct; at the centrifugal air outlet, the bottom guide wall is arranged horizontally or obliquely upward to allow the airflow to leave the centrifugal air outlet horizontally or obliquely upward.

13. The air supply unit of the fan filter unit according to claim 6, characterized in that: The air guide structure has a partition wall, and 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.

14. The air supply unit of the fan filter unit according to claim 13, characterized in that: The flow guiding structure also has: An outer guide wall defining an outer boundary of the air duct, which extends outwardly in a curved line from an inner wall surface of the volute around the central axis; An inner guide wall defining an inner boundary of the air duct; A bottom guide wall defining the lower boundary of the air duct is further provided with a plurality of small holes extending vertically, and the bottom guide wall, the outer guide wall, and the inner guide wall together enclose the centrifugal air outlet; and, The top guide wall defining the upper boundary of the air duct connects the outer guide wall and the inner wall surface of the volute and extends obliquely downward around the central axis; the partition wall protrudes inward from the outer guide wall, is located between the top guide wall and the bottom guide wall and is connected to the bottom guide wall, and the centripetal air outlet is provided between the inner edge of the partition wall and the inner edge of the bottom guide wall.

15. The air supply unit of the fan filter unit according to claim 6, characterized in that: A portion of the flow guide structure is integrally formed with the volute to form a first structural member, the edges of the lower end of the first structural member are sealed and mounted on the upper surface of the top plate, and the first structural member has a groove recessed inside thereof and a clamping portion formed at the groove; The rest of the guide structure is configured as an integrally formed second structural member, the upper portion of which is assembled and connected to the first structural member and fits into the groove, and the lower portion of which extends from top to bottom through the air inlet into the interior of the box; Furthermore, the second structural member has a matching portion which is mutually limited with the clamping portion on the circumference of the central axis, and one of the clamping portion and the matching portion is a clamping groove and the other is a protrusion.

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