Fan

Abstract

The utility model discloses a fan which is characterized in that a shell is provided with an air inlet, an air outlet and at least two air cavities which are located between the air inlet and the air outlet and are communicated with each other, a partition piece is arranged between every two adjacent air cavities, and a through hole is formed in the center of each partition piece; wind wheels are arranged in the wind cavities, and when the wind wheels rotate, airflow sucked into the corresponding wind cavities can be guided to the circumferential inner walls of the wind cavities; the flow guide structure is arranged on the partition piece and can guide airflow from the circumferential inner wall of the air cavity on the upstream side to the through hole. Under the assistance of the flow guide structure, air flow in the upper-stage air cavity can smoothly flow into the lower-stage air cavity, and vibration noise caused by air retention in the upper-stage air cavity is avoided; and meanwhile, the effect of achieving a large wind pressure value at a small rotating speed is achieved under the effect of series connection of the two wind wheels, energy consumption is effectively reduced, and operation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to wind energy equipment, in particular to a fan. Background Art

[0002] With the development of modern science and technology, people have higher and higher requirements for the performance of fans. Under the limitations of structural dimensions and energy efficiency, the flow rate and pressure of a single fan cannot be increased indefinitely. To increase the flow rate and pressure, two or more fans are connected in series to operate, so that the entire fan system can generate high wind pressure and large air volume under low-speed operation, thereby improving the operating efficiency of the fan, reducing the operating energy consumption and noise of the fan.

[0003] In the existing series-connected double fans, the primary and secondary fans are directly arranged vertically up and down through the motor shaft. The defect is that the air flow flowing into the primary fan cannot be completely introduced into the secondary fan due to high pressure, and the wind pressure and air volume of the series-connected fans cannot be effectively improved. At the same time, a large amount of air flow stays in the primary fan chamber, which will cause great vibration and lead to noise problems. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the above technical problems in the related art to a certain extent. For this purpose, the utility model provides a fan.

[0005] To achieve the above object, the technical solution of the utility model is as follows:

[0006] The fan according to the first aspect embodiment of the utility model includes:

[0007] A housing, the housing is provided with an air inlet, an air outlet, and at least two air chambers that communicate with each other between the air inlet and the air outlet. A partition is arranged between adjacent air chambers, and a through hole is opened at the center of the partition.

[0008] A wind wheel, the wind wheel is arranged in the air chamber, and when the wind wheel rotates, it can guide the air flow inhaled into the corresponding air chamber to the circumferential inner wall of the air chamber.

[0009] A flow guiding structure, the flow guiding structure is arranged on the partition, and the flow guiding structure can guide the air flow from the circumferential inner wall of the upstream air chamber to the through hole.

[0010] The fan according to the embodiment of the utility model has at least the following beneficial effects: With the assistance of the flow guiding structure, the air flow in the upper-level air chamber can flow smoothly into the lower-level air chamber, avoiding the generation of vibration noise caused by the retention of gas in the upper-level air chamber; at the same time, under the series action of the two wind wheels, the effect of achieving a large wind pressure value at a small rotational speed is realized, effectively reducing energy consumption and improving operating efficiency.

[0011] According to some embodiments of the present utility model, the flow guiding structure includes a plurality of flow guiding parts, and each of the flow guiding parts is distributed around the through hole on the end surface of the wind cavity of the partition member facing the upstream side, and the flow guiding part extends from the periphery of the partition member towards the direction of the through hole.

[0012] According to some embodiments of the present utility model, the two ends of the flow guiding part are respectively a first end and a second end, the second end is closer to the through hole than the first end, and the first end is attached to the circumferential inner wall of the wind cavity.

[0013] According to some embodiments of the present utility model, the second end does not protrude into the axial space range opposite to the through hole.

[0014] According to some embodiments of the present utility model, the end surface of the second end is provided as an inclined surface, the inclined surface is inclined relative to the plane of the partition member, and the side where the inclined surface is connected to the partition member is closer to the through hole, and the inclination angle φ of the inclined surface satisfies 30° ≤ φ < 90°.

[0015] According to some embodiments of the present utility model, the maximum height dimension of the flow guiding part in the axial direction of the through hole is A, and the maximum height dimension of the wind cavity towards which the flow guiding part faces is B, and it satisfies A > 0.1B.

[0016] According to some embodiments of the present utility model, the minimum interval dimension between the flow guiding part and the end surface of the wind wheel towards which it faces is E, and it satisfies 2 mm ≤ E ≤ 3 mm.

[0017] According to some embodiments of the present utility model, the maximum width dimension of the flow guiding part is C, and the circumference of the through hole is L, and it satisfies: 0.05L ≤ C ≤ 0.1L.

[0018] According to some embodiments of the present utility model, the wind wheel includes an upper cover plate, a lower cover plate and wind blades, an air inlet is provided at the center of the upper cover plate, and a plurality of wind blades are connected between the upper cover plate and the lower cover plate, and air outlets are formed in the circumferential direction of the wind wheel between adjacent wind blades.

[0019] According to some embodiments of the present utility model, the upper cover plate is in a conical shape with the middle part protruding axially.

[0020] Some additional aspects and advantages of the present utility model will be given in the following description, some will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a schematic diagram of the structural decomposition of the motor;

[0023] Figure 2 It is a schematic diagram of the internal structure of the motor;

[0024] Figure 3 is Figure 2 the schematic diagram of the air flow of;

[0025] Figure 4 It is a schematic diagram of the partition and the flow guiding structure;

[0026] Figure 5 is Figure 4 the cross-sectional view of;

[0027] Figure 6 It is a schematic diagram of the structure of the wind wheel;

[0028] Figure 7 It is a comparison diagram of the effects of the fan and the prior art;

[0029] Figure 8 It is a schematic diagram of the air flow velocity vector diagram inside the housing.

[0030] Reference numerals: housing 100; air inlet 110; air outlet 120; air cavity 130; upper air cavity 131; lower air cavity 132; partition 140; through hole 141; wind wheel 200; upper cover plate 210; air inlet 211; lower cover plate 220; wind blade 230; air outlet 231; flow guiding structure 300; flow channel 301; flow guiding portion 310; first end 311; second end 312; motor 400. Detailed Description of the Embodiment

[0031] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0032] The present invention relates to a fan, which includes a housing 100, a wind wheel 200 and a flow guiding structure 300.

[0033] As Figure 1 , Figure 2 and Figure 4As shown in the figure, the outer contour of the housing 100 can be set to a cylindrical shape. An air inlet 110 and an air outlet 120 are provided on the housing 100. The air inlet 110 can be set at the center of the top of the housing 100 or other positions. The air outlet 120 is provided on one side of the bottom of the housing 100 or other positions. At least two air chambers 130 are provided inside the housing 100. The number of air chambers 130 can be two, three or more. Each air chamber 130 communicates with each other between the air inlet 110 and the air outlet 120, and each air chamber 130 can be arranged in series in sequence. A partition 140 is provided between adjacent air chambers 130, and adjacent air chambers 130 are separated by the partition 140. A through hole 141 is provided at the center of the partition 140. Adjacent air chambers 130 communicate with each other through the through hole 141. In this embodiment, an example of two air chambers 130 provided inside the housing 100 is described. In the illustrated direction, the two air chambers 130 are distributed vertically. The upper air chamber 130 is defined as the upper-level air chamber 131, and the lower air chamber 130 is defined as the lower-level air chamber 132. The air inlet 110 communicates with the upper part of the upper-level air chamber 131, and the air outlet 120 communicates with the lower part of the lower-level air chamber 132. The partition 140 between the upper-level air chamber 131 and the lower-level air chamber 132 can be set to a plate structure. The partition 140 can be installed inside the housing 100 as an independent component, or directly extend from the inner wall of the housing 100 and be integrally formed. One wind wheel 200 is correspondingly provided in each air chamber 130, that is, one wind wheel 200 is provided in the upper-level air chamber 131, and one wind wheel 200 is provided in the lower-level air chamber 132. The two wind wheels 200 can be coaxially installed on the same motor 400, or each wind wheel 200 can be respectively installed on different motors 400. The motor 400 can be provided outside the housing 100, and the drive shaft of the motor 400 extends into the air chamber 130 to be connected with the wind wheel 200; or the motor 400 can be installed inside the lower-level air chamber 132, and the drive shaft of the motor 400 passes through the through hole 141 from the lower-level air chamber 132 and extends into the upper-level air chamber 131. The two wind wheels 200 are equivalent to being installed in series on the drive shaft of the motor 400. The motor 400 can drive each wind wheel 200 to rotate synchronously. When the wind wheel 200 rotates, a negative pressure is formed in the air chamber 130. External air enters the upper-level air chamber 131 through the air inlet 110, and the air flow in the upper-level air chamber 131 then flows to the lower-level air chamber 132 through the through hole 141, and finally is discharged outward from the air outlet 120. The wind wheel 200 can be selected as a centrifugal wind wheel 200. The air flow enters the air chamber 130 through the air inlet 110 / through hole 141, and the air flow flows toward the circumferential inner wall of the air chamber 130 under the action of the wind wheel 200, and then flows downward along the circumferential inner wall of the air chamber 130. According to the air flow direction, the upper-level air chamber 131 is located on the upstream side of the lower-level air chamber 132. A flow guiding structure 300 is provided on the partition 140. Such as Figure 3As shown, the flow guiding structure 300 is used to converge the air flow from the circumferential inner wall of the wind cavity 130 (the upper-level wind cavity 131) on the upstream side towards the through hole 141. That is, after the air flow enters the upper-level wind cavity 131, under the guiding action of the corresponding wind wheel 200, the air flow flows to the circumferential inner wall of the upper-level wind cavity 131, and then flows downward along the circumferential inner wall of the upper-level wind cavity 131. After flowing to the periphery of the partition member 140, it changes direction under the action of the flow guiding structure 300 and continues to flow radially along the partition member 140 towards the through hole 141 to converge, and finally flows into the lower-level wind cavity 130 through the through hole 141. With the assistance of the flow guiding structure 300, the air flow in the upper-level wind cavity 131 can smoothly flow into the lower-level wind cavity 132, avoiding the generation of vibration noise due to the retention of gas in the upper-level wind cavity 131; at the same time, under the series action of the two wind wheels 200, the effect of achieving a larger wind pressure value at a smaller rotational speed is realized, effectively reducing energy consumption and improving operation efficiency. As Figure 7 shown, compared with a conventional fan, the fan structure of the present invention can achieve a very high air volume at the same rotational speed. As Figure 8 shown, arrow color: represents the air flow velocity. From blue, green, yellow, orange to red, the air flow velocity inside the fan gradually increases (i.e., red represents the area with the maximum fan wind speed, and blue represents the area with the minimum fan wind speed); arrow direction: represents the air flow direction inside the fan; arrow thickness: represents the air volume, that is, the thicker the arrow, the larger the air flow volume at the arrow; arrow density: represents the air flow convergence amount inside the fan, that is, the more concentrated the arrows, the more the air flow converges at that place.

[0034] In some specific embodiments of the present invention, as Figure 2 、 Figure 4 and Figure 5 shown, the flow guiding structure 300 includes a plurality of flow guiding portions 310. The flow guiding portions 310 can be independent components installed on the partition member 140, or can be integrally formed by protruding on the partition member 140. The flow guiding portions 310 protrude upward on the end face of the partition member 140 facing the upper-level wind cavity 131. The flow guiding portions 310 can be in a straight strip shape, and its cross-section can be in shapes such as circular, rectangular, triangular, trapezoidal, etc., which are not limited herein. The plurality of flow guiding portions 310 are distributed around the through hole 141, and the flow guiding portions 310 extend from the periphery of the partition member 140 towards the through hole 141. The flow guiding portions 310 can extend along the radial direction of the partition member 140, or can have a certain angle with the diameter of the partition member 140. A fan-shaped flow channel 301 is formed by the interval between adjacent two flow guiding portions 310, and the flow channel 301 gradually narrows from the periphery of the partition member 140 towards the through hole 141. The air flow flows downward along the circumferential inner wall of the upper-level wind cavity 131 to the partition member 140, and then changes direction and converges towards the through hole 141 along each flow channel 301.

[0035] Wherein, the two ends of the flow guiding portion 310 are respectively defined as a first end 311 and a second end 312. The second end 312 is closer to the through hole 141 than the first end 311, that is, the first end 311 is close to the periphery of the partition member 140. The first end 311 is attached to the circumferential inner wall of the upper air cavity 131. The first end 311 may be integrally formed with the circumferential inner wall of the upper air cavity 131. When the gas flows along the circumferential inner wall of the housing 100 towards the partition member 140, it can directly enter the flow channel 301, which is beneficial to the airflow to change direction and flow along the flow channel 301, and reduces the occurrence of turbulent flow of the airflow in the upper air cavity 131.

[0036] Further, the second end 312 may pass through the through hole 141 and extend into the lower air cavity 132 to guide the airflow. It may also be that the second end 312 does not protrude into the axial space range opposite to the through hole 141. The diameter of the virtual circumcircle of the space where the second ends 312 of the flow guiding portions 310 are located is not less than the diameter of the through hole 141. This is beneficial to the airflow to be more smooth when transitioning from the flow channel 301 to the through hole 141.

[0037] The end face of the second end 312 may be set perpendicular to the partition member 140. In some specific embodiments of the present invention, as Figure 5 shown, the end face of the second end 312 is set as an inclined plane. The partition member 140 may be set as a flat plate shape, and its upper end face is a plane. The inclined plane is inclined relative to the upper plane of the partition member 140. The lower side of the inclined plane is connected to the upper plane of the partition member 140, and the lower side of the inclined plane is closer to the through hole 141 than the upper side. The angle of the inclined plane relative to the plane of the partition member 140 is an inclined angle. The inclined angle φ of the inclined plane satisfies 30° ≤ φ < 90°. This is beneficial to the airflow to be introduced into the through hole 141 to enter the lower air cavity 132 to the greatest extent.

[0038] In some specific embodiments of the present invention, as Figure 3 and Figure 5 shown, the maximum height dimension of the flow guiding portion 310 in the axial direction of the through hole 141 is A, that is, the maximum height dimension of the flow guiding portion 310 protruding upward from the partition member 140 is A. The maximum height dimension of the air cavity 130 towards which the flow guiding portion 310 faces is B, that is, the maximum height dimension of the upper air cavity 131 is B. A and B satisfy A > 0.1B. Further, the upper end face of the flow guiding portion 310 may be a horizontal plane or may be set as a surface with a certain slope. The minimum spacing dimension between the flow guiding portion 310 and the lower end face of the wind wheel 200 located in the upper air cavity 131 is E, and it satisfies 2 mm ≤ E ≤ 3 mm. The lower end face of the wind wheel 200 may be a plane, and there is a gap between the lower end face of the wind wheel 200 and each flow channel 301. The lower end face of the wind wheel 200 is located above each flow channel 301. The dimension range of 2 mm ≤ E ≤ 3 mm can ensure that the wind wheel 200 does not interfere with the flow guiding portion 310 during operation and can also ensure that the airflow flows along the flow channel 301 as much as possible.

[0039] Among them, the diversion part 310 can be of a uniform width throughout in the width direction, or can be of a gradually changing width. The maximum width dimension of the diversion part 310 is C, and the perimeter of the through hole 141 is L, which satisfies: 0.05L ≤ C ≤ 0.1L. This is conducive to guiding the airflow into the lower air cavity 132 to the greatest extent and improving the operation efficiency of the fan.

[0040] In some specific embodiments of the present utility model, such as Figure 2 and Figure 6 As shown, the wind wheel 200 includes an upper cover plate 210, a lower cover plate 220 and wind blades 230. The lower cover plate 220 can be arranged in a flat plate shape. An air inlet 211 is provided at the center of the upper cover plate 210. A plurality of wind blades 230 are connected between the upper cover plate 210 and the lower cover plate 220. An air outlet 231 is formed between adjacent wind blades 230 in the circumferential direction of the wind wheel 200. Each air outlet 231 faces the circumferential inner wall of the air cavity 130. The air enters the air cavity 130 from the air inlet 110 / through hole 141. A part of the airflow flows along the upper surface of the upper cover plate 210 towards the circumferential inner wall of the air cavity 130, and a part of the airflow enters the wind wheel 200 from the air inlet 211, and then is discharged from each air outlet 231 and impacts on the circumferential inner wall of the air cavity 130. Among them, the air inlet 110, the air inlet 211 and the through hole 141 can be on the same axis. The minimum dimension of the gap between the lower cover plate 220 and the diversion part 310 is E. The lower end surface of the lower cover plate 220 is close to the flow channel 301, which can further limit the airflow to flow in the flow channel 301. Among them, the upper cover plate 210 is in a conical shape with the middle part axially protruding, which can better guide the airflow.

[0041] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In the present utility model, unless otherwise clearly stipulated and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0045] In the description of this specification, the description with reference to terms such as "some specific embodiments" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0046] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A fan, characterized in that: include: A housing (100), the housing (100) being provided with an air inlet (110), an air outlet (120), and at least two wind cavities (130) located between the air inlet (110) and the air outlet (120) and communicating with each other, a partition (140) being provided between adjacent wind cavities (130), and a through hole (141) being provided at the center of the partition (140); A wind wheel (200), wherein the wind cavity (130) is provided with the wind wheel (200), and when the wind wheel (200) rotates, the airflow sucked into the corresponding wind cavity (130) can be directed toward the circumferential inner wall of the wind cavity (130); A flow guiding structure (300), wherein the flow guiding structure (300) is arranged on the partition (140), and the flow guiding structure (300) is capable of guiding the airflow from the circumferential inner wall of the wind cavity (130) on the upstream side to the through hole (141).

2. The fan according to claim 1, characterized in that: The flow guide structure (300) comprises a plurality of flow guide portions (310), each of the flow guide portions (310) being distributed around the through hole (141) on an end surface of the partition (140) facing the wind cavity (130) on the upstream side, and the flow guide portions (310) extending from the periphery of the partition (140) in the direction of the through hole (141).

3. The fan according to claim 2, characterized in that: The two ends of the air guide portion (310) are respectively a first end (311) and a second end (312); the second end (312) is closer to the through hole (141) than the first end (311); and the first end (311) is attached to the circumferential inner wall of the air cavity (130).

4. The fan according to claim 3, characterized in that: The second end (312) does not protrude into the axial space range corresponding to the through hole (141).

5. The fan according to claim 3, characterized in that: The end surface of the second end (312) is arranged as a slope, the slope is inclined relative to the plane of the partition (140), and the side of the slope connected to the partition (140) is closer to the through hole (141), and the slope angle φ of the slope satisfies 30°≤φ<90°.

6. The fan according to claim 2, characterized in that: The maximum height dimension of the air guide portion (310) in the axial direction of the through hole (141) is A, and the maximum height dimension of the wind cavity (130) toward which the air guide portion (310) faces is B, which satisfies A>0.1B.

7. The fan according to claim 2 or 6, characterized in that: The minimum spacing dimension between the guide portion (310) and the end surface of the wind wheel (200) to which it is directed is E, which satisfies 2mm≤E≤3mm.

8. The fan according to claim 2, characterized in that: The maximum width dimension of the guide portion (310) is C, and the perimeter of the through hole (141) is L, which satisfies: 0.05L≤c≤0.1L.

9. The fan according to claim 1, characterized in that: The wind wheel (200) comprises an upper cover plate (210), a lower cover plate (220) and fan blades (230); an air inlet (211) is provided at the center of the upper cover plate (210); a plurality of fan blades (230) are connected between the upper cover plate (210) and the lower cover plate (220); and an air outlet (231) is formed between adjacent fan blades (230) in the circumferential direction of the wind wheel (200).

10. The fan according to claim 9, characterized in that: The upper cover plate (210) is in a conical shape with a central portion protruding along the axial direction.

Images