Double-suction centrifugal wind wheel and double-suction centrifugal fan

Abstract

The utility model provides a double-suction centrifugal wind wheel and a double-suction centrifugal fan, the double-suction centrifugal wind wheel comprises a first blade group, a second blade group and a hub structure, the two axial ends of the hub structure are a first end and a second end respectively, the first end is located in the first blade group, and the second end is located in the second blade group; the hub structure comprises a first flow guide section located in the first blade set and a second flow guide section located in the second blade set, the first flow guide section is provided with the first end, and the outer diameter of the first flow guide section is gradually reduced from the first end to the second end in the axial direction of the double-suction centrifugal wind wheel. The second flow guide section is provided with the second end, and the outer diameter of the second flow guide section is gradually reduced from the second end to the first end in the axial direction of the double-suction centrifugal wind wheel. According to the hub structure, the first flow guide section and the second flow guide section are arranged, so that a low-speed area in a fan blade can be filled, a flow field is more uniform, vortex is reduced, energy dissipation of turbulent flow is reduced, the air supply efficiency is improved, and the air volume is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of double-suction centrifugal fans, and in particular relates to a double-suction centrifugal wind wheel and a double-suction centrifugal fan. Background Art

[0002] Centrifugal fans typically consist of a volute, a centrifugal impeller, and a motor. They can change the flow direction of a fluid medium from axial to radial, and are widely used in the air duct systems of current air conditioners. The impeller consists of a hub and a set of blades arranged in a ring around the axis of the hub. The hub and blades are fixedly connected to the external motor shaft, driving the hub to rotate.

[0003] Double suction centrifugal fan refers to a centrifugal fan that has air intake on both sides of the centrifugal impeller. It has the characteristics of large flow coefficient and small rotor rotation coefficient and is widely used. The existing double suction centrifugal fan includes a double suction centrifugal impeller, which has a flat hub. Figure 1 The figure shows the internal velocity cloud diagram of the blade of a double-suction centrifugal fan with a flat hub. Figure 2 The figure shows the turbulent kinetic energy cloud diagram inside the blade of a double suction centrifugal fan with a flat hub. Figure 1 It can be seen that there is a large low-speed flow area in the circle area inside the blade group. The airflow will generate small vortices in this area, forming turbulence, increasing energy dissipation and reducing air supply efficiency. At the same time, the mutual mixing and shearing in the fluid is very serious, which may produce unacceptable noise. Figure 2 It can be seen that the turbulent kinetic energy of the fan blade is larger in the circle area, which means that the turbulence intensity is larger, the fluid motion is unstable, and a disturbance effect of detention will be produced. Utility Model Content

[0004] Therefore, the utility model provides a double-suction centrifugal impeller and a double-suction centrifugal fan, which can solve the technical problem in the prior art that there is a low-speed flow field area inside the fan blades of the double-suction centrifugal fan, which is easy to form turbulence, increase energy dissipation, and reduce air supply efficiency.

[0005] In order to solve the above problems, the present invention provides a double-suction centrifugal wind wheel, comprising a first blade group, a second blade group and a hub structure, wherein the first blade group and the second blade group are arranged in sequence along the axial direction of the double-suction centrifugal wind wheel, and the hub structure and the first blade group and the second blade group are kept relatively fixed;

[0006] The hub structure has two axial ends, respectively a first end and a second end, the first end is located in the first blade group, and the second end is located in the second blade group;

[0007] In which, the hub structure includes a first guide section located in the first blade group and a second guide section located in the second blade group, the first guide section has the first end, and the outer diameter of the first guide section gradually decreases from the first end to the second end along the axial direction of the double-suction centrifugal wind wheel; the second guide section has the second end, and the outer diameter of the second guide section gradually decreases from the second end to the first end along the axial direction of the double-suction centrifugal wind wheel.

[0008] In some embodiments, the first guide section includes an end plate located at the first end and a truncated cone barrel section extending from the end plate to the second end;

[0009] The axial height of the truncated cone barrel section is h, the radius of the small end of the truncated cone barrel section is r1, and the radius of the large end of the truncated cone barrel section is r2, wherein h / (r2-r1)≥1.

[0010] In some embodiments, the double-suction centrifugal impeller further includes a shaft disk for separating the first blade group and the second blade group, the hub structure is fixed on the shaft disk, and the hub structure is fixedly connected to the first blade group and the second blade group through the shaft disk.

[0011] In some embodiments, the double-suction centrifugal impeller further includes a bearing for being fixedly sleeved with an external motor shaft, the bearing being fixed on the shaft disc, and the bearing being located inside the hub structure; the hub structure has a through hole, and the through hole is used for the external motor shaft to pass through so as to be connected to the bearing.

[0012] In some embodiments, the shaft hole of the bearing has a flat-position mating surface for mating with the flat position of the external motor shaft, and the outer wall of the bearing is further provided with a screw hole penetrating to the inner wall of the shaft hole.

[0013] In some embodiments, the hub structure includes a first hub located in the first blade assembly, the first hub having the first guide section;

[0014] Wherein, the first wheel hub is detachable.

[0015] In some embodiments, when the double-suction centrifugal impeller has the shaft disc, the first hub is detachably disposed on the shaft disc; the first hub has a first flange on the side away from the first end, and the first hub is detachably connected to the shaft disc through the first flange.

[0016] In some embodiments, the end of the first guide section facing away from the first end has an outer flange, the outer flange forms the first flange, and the width of the outer flange is ≥15 mm.

[0017] In some embodiments, a positioning post is provided on one of the first flange and the shaft disc, and a positioning hole is provided on the other, and the positioning post is used to be inserted into the positioning hole to position the first hub.

[0018] In some embodiments, the hub structure includes a second hub located in the second blade assembly, and the second hub has the second guide section;

[0019] Wherein, the second hub is detachable.

[0020] In some embodiments, when the hub structure includes a first hub located in the first blade assembly, the first hub has the first guide section, and the first hub is detachable, the second hub and the first hub are symmetrical structures.

[0021] In some embodiments, when the double-suction centrifugal impeller has a shaft disk, and the hub structure includes a first hub located in the first blade group, the first hub has the first guide section, and the first hub has a first flange on a side away from the first end, and the first hub is detachably connected to the shaft disk through the first flange,

[0022] The second hub has a second flange on the side facing away from the second end, and the second hub is detachably connected to the shaft disc via the second flange; wherein, the first flange is detachably connected to the shaft disc via screws, and the screws are also connected to the second flange, so that the second flange is also detachably connected to the shaft disc via the screws.

[0023] In some embodiments, when the double-suction centrifugal impeller has a shaft disc, and the hub structure includes a first hub located in the first blade group, the first hub has the first guide section, the first hub has a first flange on the side away from the first end, the first hub is detachably connected to the shaft disc through the first flange, and a positioning column is provided on the first flange, and a positioning hole is provided on the shaft disc, the positioning hole passes through the axial ends of the shaft disc, and another positioning column is provided on the second flange, the positioning column is used to be inserted from one axial side of the positioning hole, and the other positioning column is used to be inserted from the other axial side of the positioning hole.

[0024] An embodiment of the present invention further provides a double-suction centrifugal fan, which includes any one of the double-suction centrifugal wind wheels described above.

[0025] An embodiment of the present utility model further provides a method for using a double-suction centrifugal fan, wherein the double-suction centrifugal fan comprises any one of the double-suction centrifugal wind wheels described above, wherein the hub structure comprises a first hub located in the first blade group, the first hub has the first guide section, and the first hub is detachable, the double-suction centrifugal fan further comprises a motor and a volute sleeved on the outer side of the double-suction centrifugal wind wheel, wherein the motor is used to drive the double-suction centrifugal wind wheel to rotate;

[0026] In which, along the axial direction of the motor, one axial end of the motor casing is opposite to one axial end of the volute, and the distance between the motor casing and the volute is L1. When L1 is less than 20 mm, the hub of the double-suction centrifugal wind wheel close to the motor is removed; and / or, the double-suction centrifugal fan is installed inside the fuselage shell, the side of the volute facing away from the motor is the first side, the fuselage shell has a first wall opposite to the first side, and the distance between the first side and the first wall is L2. When L2 is less than 20 mm, the hub of the double-suction centrifugal wind wheel facing away from the motor is removed.

[0027] The double-suction centrifugal fan and the double-suction centrifugal fan provided by the utility model have the following beneficial effects:

[0028] 1. The hub structure, by providing the first and second guide sections, can fill the low-speed area inside the blade, making the flow field more uniform, reducing eddies, lowering turbulent energy dissipation, increasing air supply efficiency, and increasing air volume. It also has a certain rectification and noise reduction function.

[0029] 2. Since both the first hub and the second hub are detachable, processing and manufacturing are facilitated. Compared with the one-piece hub processing method in the prior art, the detachable method makes the production of the first hub and the second hub efficient, and the installation and disassembly are very convenient. When used on a double-suction centrifugal fan, it can effectively increase the air supply volume while reducing noise.

[0030] 3. Different wheel hub solutions can be flexibly matched according to the air duct and resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the description of the prior art. The drawings described below are merely exemplary. For those skilled in the art, other implementation drawings can be derived from the provided drawings without inventive effort.

[0032] Figure 1 The figure shows the internal velocity cloud diagram of the blades of a double-suction centrifugal fan with a flat hub;

[0033] Figure 2 The figure shows the turbulent kinetic energy cloud diagram inside the blades of a double-suction centrifugal fan with a flat-plate hub.

[0034] Figure 3 The figure shows a velocity cloud diagram inside the blades of a double-suction centrifugal impeller of the present invention;

[0035] Figure 4 A cloud diagram of turbulent kinetic energy inside the blades of a double-suction centrifugal wind wheel of the present invention is shown;

[0036] Figure 5 This is a cross-sectional view of the double-suction centrifugal impeller of the present utility model;

[0037] Figure 6 yes Figure 5 A magnified schematic diagram of point A in the middle;

[0038] Figure 7 It is a half-section view of the first hub;

[0039] Figure 8 This is a three-dimensional diagram of the double-suction centrifugal impeller of the present utility model;

[0040] Figure 9 This is a schematic diagram of the assembly of the double-suction centrifugal impeller and the motor shaft of the utility model;

[0041] Figure 10 It is a schematic diagram of the structure of the first hub;

[0042] Figure 11 is a top view of the first hub;

[0043] Figure 12 It is a schematic diagram reflecting that the first hub and the second hub share a screw;

[0044] Figure 13 This is a structural diagram of a double-suction centrifugal fan of the present invention;

[0045] Figure 14 This is a reference diagram of the double-suction centrifugal fan of the present invention in use;

[0046] Figure 15 This is another reference diagram of the double-suction centrifugal fan of the present invention in use.

[0047] The accompanying drawings are:

[0048] 1. Shaft disc; 2. First blade group; 3. Second blade group; 4. Motor; 5. Hub structure; 6. Screw; 7. Bearing; 8. First screw; 10. Volute; 11. Body shell; 12. First A side; 13. Second A side; 41. Motor shaft; 42. Motor housing; 50. Screw column; 51. First guide section; 52. Second guide section; 53. Positioning column; 54. Another positioning column; 71. Flat position mating surface; 72. Screw hole; 100. Double-suction centrifugal impeller; 101. Through hole; 102. Positioning hole; 111. First wall; 112. First side; 411. Flat position; 501. First end; 502. Second end; 511. Cone cylinder section; 512. End plate; 513. First flange; 521. Second flange; 701. Shaft hole; 5A. First hub; 5B. Second hub. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0053] See also Figure 5-Figure 12 As shown, according to an embodiment of the present invention, a double-suction centrifugal impeller 100 is provided, comprising a first blade assembly 2, a second blade assembly 3, and a hub structure 5. The first blade assembly 2 and the second blade assembly 3 are arranged in sequence along the axial direction of the double-suction centrifugal impeller 100. The hub structure 5 is relatively fixed to the first blade assembly 2 and the second blade assembly 3, so that when the hub structure 5 is driven, it can drive the first blade assembly 2 and the second blade assembly 3 to rotate together. The hub structure 5 is also configured to be fixedly connected to an external motor shaft 41 so as to be driven to rotate by the motor shaft 41.

[0054] The aforementioned hub structure 5 has a first end 501 and a second end 502 that are opposite to each other in the axial direction. The first end 501 is located in the first blade group 2, and the second end 502 is located in the second blade group 3. The hub structure 5 includes a first guide section 51 located in the first blade group 2 and a second guide section 52 located in the second blade group 3. The first guide section 51 has the first end 501 of the aforementioned hub structure, and the outer diameter of the first guide section 51 gradually decreases from the first end 501 to the second end 502 along the axial direction of the double-suction centrifugal wind wheel 100. The second guide section 52 has the second end 502 of the aforementioned hub structure, and the outer diameter of the second guide section 52 gradually decreases from the second end 502 to the first end 501 along the axial direction of the double-suction centrifugal wind wheel 100.

[0055] In the above example, the first guide section 51 forms a protruding hub in the first blade assembly 2 , and the second guide section 52 forms a protruding hub in the second blade assembly 3 .

[0056] In order to illustrate the effects of the first guide section 51 and the second guide section 52, Figure 3 shows a velocity cloud diagram inside the blade of the double-suction centrifugal impeller 100. Figure 4 FIG. 1 shows a turbulent kinetic energy cloud diagram of the blades of the double suction centrifugal wind wheel 100. Figure 3 It can be seen that the first guide section 51 and the second guide section 52 of the hub structure 5 can fill the low-speed area inside the fan blade, making the flow field inside the fan blade more uniform, having a certain rectification and noise reduction function, and increasing the air volume. Figure 4 It can be seen that the turbulent kinetic energy inside the fan blade is small and the fluid motion is stable. Figure 3 and Figure 4 It can be concluded that the first and second guide sections 51 and 52 can fill the low-speed area inside the blade, making the flow field more uniform, reducing eddies and turbulent energy dissipation, increasing air supply efficiency and air volume. Furthermore, they also have a certain degree of rectification and noise reduction function.

[0057] It should be noted here that: the above-mentioned double-suction centrifugal wind wheel 100 has air inlets on both sides along the axial direction, and the double-suction centrifugal wind wheel 100 can simultaneously take in air from both sides of the axial direction and discharge air in the radial direction. Since the above-mentioned first end 501 is located within the first blade group 2, the first end 501 does not protrude from the end of the first blade group 2 that is away from the second blade group 3 along the axial direction of the double-suction centrifugal wind wheel 100. Similarly, since the above-mentioned second end 502 is located within the second blade group 3, the second end 502 does not protrude from the end of the second blade group 3 that is away from the first blade group 2 along the axial direction of the double-suction centrifugal wind wheel 100.

[0058] In some embodiments, as Figure 5 As shown, the first guide section 51 may include an end plate 512 located at the first end 501 and a truncated cone section 511 extending from the end plate 512 to the second end 502. The end plate 512 may be disc-shaped and perpendicular to the axis of the double-suction centrifugal impeller 100. Figure 7 As shown, the connection between the end plate 512 and the truncated cone barrel section 511 can be a circular arc transition. The height of the truncated cone barrel section 511 in the axial direction of the double-suction centrifugal impeller 100 is h, the radius of the small end of the truncated cone barrel section 511 is r1, and the radius of the large end of the truncated cone barrel section 511 is r2, wherein h / (r2-r1)≥1.

[0059] In the above example, by ensuring h / (r2-r1) ≥ 1, the slope of the frustoconical barrel section 511 can be controlled to be greater than 45°, thereby ensuring the uniform airflow and efficiency of the hub structure 5. The maximum outer diameter of the hub structure 5 must be smaller than the inner diameter of the blade assembly; otherwise, the hub structure 5 cannot be installed. The slope of the frustoconical barrel section 511 cannot be too small. When the slope angle of the frustoconical barrel section 511 is less than 45°, even if the outer diameter of the hub structure 5 is maximized (close to the inner diameter of the blade assembly), the axial height of the first guide section 51 is still small, and it cannot effectively fill the low-speed zone within the blade assembly.

[0060] In order to achieve the effect of fixed connection between the hub structure 5 and the first blade group 2 and the second blade group 3, in some embodiments, as shown in FIG. Figure 5 As shown, the aforementioned double-suction centrifugal impeller 100 may further include a shaft disc 1, which is used to separate the first blade group 2 and the second blade group 3. The aforementioned hub structure 5 is fixed to the shaft disc 1, and the hub structure 5 is fixedly connected to the first blade group 2 and the second blade group 3 through the shaft disc 1.

[0061] In the above example, the shaft disc 1, sometimes also referred to as the center disc, is fixedly connected to the first blade assembly 2 and the second blade assembly 3. For example, the first blade assembly 2 and the second blade assembly 3 can be integrally formed on the shaft disc 1. By separating the first blade assembly 2 and the second blade assembly 3, the shaft disc 1 also prevents air flow from the first blade assembly 2 and the second blade assembly 3. The shaft disc 1 is generally disc-shaped.

[0062] In some embodiments, as Figure 5 As shown, the aforementioned double-suction centrifugal impeller 100 may further include a bearing 7, which is used to be sleeved and fixed with the external motor shaft 41. The bearing 7 is fixed to the shaft disc 1. For example, the bearing 7 can be integrally formed on the shaft disc 1. The bearing 7 is located inside the hub structure 5. The hub structure 5 has a through hole 101, which is used for the external motor shaft 41 to pass through and connect to the bearing 7. Specifically, the external motor shaft 41 is used to connect to the bearing 7 through the hole 101.

[0063] In the above example, since the hub structure 5 and the bearing 7 are both fixed to the shaft disc 1, when the external motor shaft 41 is sleeved and fixed with the bearing 7, the external motor shaft 41 and the hub structure 5 also remain relatively fixed, thereby achieving the function of fixed connection between the hub structure 5 and the external motor shaft 41. Specifically, the external motor shaft 41 can drive the shaft disc 1 to rotate through the bearing 7, so that the shaft disc 1 drives the hub structure 5, the first blade group 2, and the second blade group 3 to rotate together.

[0064] In order to realize the function of the aforementioned bearing 7 being sleeve-fixed with the external motor shaft 41, as shown in FIG. Figure 8 and Figure 9As shown, in some embodiments, the aforementioned bearing axial hole 701 has a flat mating surface 71, which is used to mate with the flat portion 411 of the external motor shaft to maintain relative fixation of the bearing 7 and the external motor shaft 41 in the circumferential direction. The outer wall of the bearing 7 is also provided with a screw hole 72 extending through the inner wall of the axial hole 701. The flat portion 411 of the external motor shaft is sometimes also referred to as a flat key.

[0065] In the above example, when assembling the external motor shaft 41 and the bearing 7, the external motor shaft 41 can be inserted into the shaft hole 701 of the bearing, and the flat mating surface 71 of the shaft hole is made opposite to the flat part 411 of the external motor shaft, so that the bearing 7 and the external motor shaft 41 are kept relatively fixed in the circumferential direction; and then the first screw 8 is screwed into the screw hole 72 so that the first screw 8 is against the external motor shaft 41, so that the motor shaft 41 and the bearing 7 are fixed by the friction resistance between the first screw 8 and the external motor shaft 41.

[0066] In some embodiments, as Figure 5 As shown, the hub structure 5 includes a first hub 5A located in the first blade assembly 2. The first hub 5A has the first guide section 51. The first hub 5A is detachable.

[0067] In the above example, since the first hub 5A is detachable, it is convenient for processing and manufacturing; compared with the one-piece hub processing method in the technology, the detachable method makes the first hub 5A highly efficient to produce, and is easy to install and disassemble. When used on a double-suction centrifugal fan, it can effectively increase the air supply volume while reducing noise.

[0068] In some embodiments, as Figure 10 and Figure 11 As shown, when the aforementioned double-suction centrifugal impeller 100 has a shaft disc 1, the aforementioned first hub 5A is detachably arranged on the shaft disc 1, and the first hub 5A has a first flange 513 on the side away from the aforementioned first end 501, and the first hub 5A is detachably connected to the shaft disc 1 through the first flange 513.

[0069] In the above example, the first flange 513 is detachably connected to the shaft disc 1 by screws 6 to facilitate assembly and disassembly of the first hub 5A and the shaft disc 1 .

[0070] It should be noted that the shaft disc 1 is provided with screw holes to facilitate connection with the first flange 513 via screws 6 .

[0071] In some embodiments, as Figure 7 As shown, the end of the first guide section 51 facing away from the first end 501 has an outer flange, which forms the first flange 513. The width of the outer flange is ≥15 mm.

[0072] In the above example, the outer flange and the first guide section 51 are integrally formed, which can improve the connection stability between the first guide section 51 and the first flange 513. In addition, because the width of the outer flange is ≥15 mm, sufficient space for screw holes can be reserved on the first flange 513, facilitating the processing of the screw holes on the first flange 513.

[0073] In some embodiments, as Figure 6 As shown, one of the first flange 513 and the shaft disc 1 is provided with a positioning post 53, and the other is provided with a positioning hole 102. The positioning post 53 is used to be inserted into the positioning hole 102 to position the first hub 5A.

[0074] In the above example, the positioning column 53 cooperates with the positioning hole 102 to position the first hub 5A when assembled to the shaft disc 1 .

[0075] In a specific application example, the center lines of the aforementioned positioning column 53 and positioning hole 102 are parallel to the axis of the double-suction centrifugal impeller 100, so that when the first hub 5A is assembled on the shaft disc 1, the positioning column 53 can be inserted into the positioning hole 102 first to complete the preliminary positioning of the first hub 5A; and then the screw 6 is used to pass through the first flange 513 and threadedly connected to the shaft disc 1 to fix the first hub 5A on the shaft disc 1.

[0076] It should be noted here that: Figure 10 and Figure 11 As shown, the first flange 513 may be provided with screw columns 50 to facilitate connection with screws 6. The positioning columns 53 may be provided on the first flange 513, and the positioning columns 53 and the screw columns 50 are located on opposite sides of the first flange 513.

[0077] In some embodiments, as Figure 5 As shown, the aforementioned hub structure 5 may further include a second hub 5B located in the second blade assembly 3, and the second hub 5B has the aforementioned second guide section 52. The second hub 5B is detachable.

[0078] In the above example, since the second hub 5B is detachable, it is convenient for processing and manufacturing; compared with the one-piece hub processing method in the technology, the detachable method makes the second hub 5B highly efficient to produce, and is easy to install and disassemble. When used on a double-suction centrifugal fan, it can effectively increase the air supply volume while reducing noise.

[0079] In some embodiments, as Figure 5As shown, when the hub structure 5 includes a first hub 5A located in the first blade assembly 2, the first hub 5A has the aforementioned first guide section 51, and the first hub 5A is detachable, the second hub 5B and the first hub 5A can be symmetrical structures.

[0080] In the above example, since the first hub 5A and the second hub 5B are symmetrical structures, the first hub 5A and the second hub 5B have the same structure, so they can be shared, which can reduce the mold cost.

[0081] In some embodiments, as Figure 12 As shown, when the double-suction centrifugal impeller 100 has a shaft disc 1, and the hub structure 5 includes a first hub 5A located within the first blade group 2, the first hub 5A has the aforementioned first guide section 51, and the first hub 5A has a first flange 513 on the side away from the first end 501. The first hub 5A is detachably connected to the shaft disc 1 via the first flange 513. The second hub 5B has a second flange 521 on the side away from the second end 502. The second hub 5B is detachably connected to the shaft disc 1 via the second flange 521. The first flange 513 is detachably connected to the shaft disc 1 via screws 6, and the screws 6 are also connected to the second flange 521, so that the second flange 521 is also detachably connected to the shaft disc 1 via the screws 6.

[0082] In the above example, the first flange 513 and the second flange 521 can share the screw 6, thereby reducing the number of screws 6 used and reducing costs.

[0083] In some embodiments, as Figure 5 and Figure 6 As shown, when the double-suction centrifugal impeller 100 has a shaft disc 1, and the hub structure 5 includes a first hub 5A located within the first blade group 2, the first hub 5A has the aforementioned first guide section 51, and the first hub 5A has a first flange 513 on the side away from the first end 501, and the first hub 5A is detachably connected to the shaft disc 1 via the first flange 513, the second hub 5B has a second flange 521 on the side away from the second end 502, and the second hub 5B is detachably connected to the shaft disc 1 via the second flange 521. The aforementioned first flange 513 is provided with a positioning column 53, and the shaft disc 1 is provided with a positioning hole 102, which passes through both axial ends of the shaft disc 1. Another positioning column 54 is also provided on the aforementioned second flange 521. For the convenience of distinction, the positioning column 53 on the first flange is taken as the first positioning column, and the other positioning column 54 on the second flange is taken as the second positioning column. The aforementioned first positioning column is used to be inserted from one axial side of the positioning hole 102, and the second positioning column is used to be inserted from the other axial side of the positioning hole 102.

[0084] In the above example, the first positioning post 53 and the second positioning post 53 share the positioning hole 102 , thereby reducing the number of positioning holes 102 and lowering the cost.

[0085] In a specific application, the hub structure 5 of the aforementioned double-suction centrifugal wind wheel 100 includes a first hub 5A located in the first blade group 2, the first hub 5A has the aforementioned first guide section 51, and the first hub 5A is detachable, and the hub structure 5 of the double-suction centrifugal wind wheel 100 may also include a second hub 5B located in the second blade group 3, the second hub 5B has the aforementioned second guide section 52, and the second hub 5B is detachable, and the double-suction centrifugal wind wheel 100 also includes a bearing 7, the bearing 7 is fixed on the shaft disc 1, the hub structure 5 has a through hole 101, and the through hole 101 passes through the first hub 5A and the second hub 5B. Wherein, when the above-mentioned double-suction centrifugal wind wheel 100 is assembled to the external motor shaft 41, wherein, as Figure 9 As shown, the second hub 5B is closer to the motor 4 relative to the first hub 5A, and the bearing 7 is located on the side of the shaft disc 1 away from the first hub 5A. Figure 9 As shown, first, insert the second hub 5B into the motor shaft 41, and push the second hub 5B as close to the motor housing 42 as possible to reserve space for installing the bearing 7 and the blade group; then push the bearing 7 to the flat position 411 of the motor shaft, and then drive the first screw 8 into the side of the bearing shaft hole 701. After the first screw 8 is driven in, insert the first hub 5A into the motor shaft 41; push the first hub 5A and the second hub 5B so that the positioning columns 53 on the first hub 5A and the second hub 5B are inserted into the corresponding positioning holes 102 to complete the pre-positioning of the first hub 5A and the second hub 5B, and then drive the screw 6 to complete the fixation between the first hub 5A and the second hub 5B and the shaft disc 1.

[0086] like Figure 13 As shown, an embodiment of the present invention further provides a double-suction centrifugal fan, which may include any of the double-suction centrifugal impellers 100 described above. Because the double-suction centrifugal fan utilizes the double-suction centrifugal impeller 100 described above, the double-suction centrifugal impeller 100, through the provision of the first guide section 51 and the second guide section 52, can fill the low-speed area within the impeller blades, making the flow field more uniform, reducing eddies, lowering turbulent energy dissipation, and increasing air supply efficiency. Furthermore, it also has a certain rectification and noise reduction function.

[0087] Among them, when the hub structure 5 of the double-suction centrifugal wind wheel 100 includes a first hub 5A located in the first blade group 2, the first hub 5A has the aforementioned first guide section 51, and the first hub 5A is detachable, and the hub structure 5 of the double-suction centrifugal wind wheel 100 can also include a second hub 5B located in the second blade group 3, the second hub 5B has the aforementioned second guide section 52, and the second hub 5B is detachable, different hub schemes can be flexibly matched according to the air duct and resistance. When the presence of the hub makes the air duct resistance smaller, the first hub 5A and the second hub 5B can be assembled to fill the low-speed area inside the blade group, uniform the flow field, increase the air volume and reduce the noise. Among them, when the air duct resistance is large, the presence of the hub will occupy the air intake space in the blade group, increase the motor load, and reduce the air volume. At this time, the first hub 5A and / or the second hub 5B can be removed according to the actual situation to reduce the motor load and increase the air volume.

[0088] Among them, different hub installation schemes are selected according to the air duct resistance. For details, please refer to the following instructions for using double-suction centrifugal fans.

[0089] An embodiment of the present invention further provides a method for using a double-suction centrifugal fan, comprising the aforementioned double-suction centrifugal fan wheel 100. The hub structure 5 of the double-suction centrifugal fan wheel 100 includes a first hub 5A located within the first blade assembly 2. The first hub 5A has the aforementioned first guide section 51, and the first hub 5A is removable. The hub structure 5 of the double-suction centrifugal fan wheel 100 may further include a second hub 5B located within the second blade assembly 3. The second hub 5B has the aforementioned second guide section 52. The second hub 5B is removable.

[0090] like Figure 13 As shown, the double-suction centrifugal fan further includes a motor 4 and a volute 10 sleeved on the outside of the double-suction centrifugal wind wheel 100. The motor 4 is used to drive the double-suction centrifugal wind wheel 100 to rotate.

[0091] In some embodiments, as Figure 14 As shown, along the axial direction of the motor 4, one axial end of the motor housing 42 is opposite to one axial end of the volute 10. Along the axial direction of the motor 4, the distance between the motor housing 42 and the volute 10 is L1. When L1 is less than 20 mm, the hub of the double-suction centrifugal impeller 100 close to the motor 4 is removed. In this example,

[0092] In the above example, when L1 is less than 20 mm, the distance between the motor housing 42 and the volute 10 is too close, resulting in extremely limited air intake space on the side of the volute 10 near the motor housing 42 and high air duct resistance. In this case, the hub of the double-suction centrifugal impeller 100 near the motor housing 42 will occupy the air intake space within the blade assembly, increasing the motor load and reducing air volume. However, by removing the hub of the double-suction centrifugal impeller 100 near the motor 4, the electrode load can be reduced and the air volume can be increased.

[0093] The shaft disc 1 has a first A side 12 and a second A side 13 opposite to each other, and the first A side 12 is closer to the motor 4 than the second A side 13. When the hub of the double-suction centrifugal impeller 100 on the side close to the motor 4 is removed, the screw 6 can pass through the shaft disc 1 from the first A side 12 and be threadedly connected to the hub of the double-suction centrifugal impeller 100 on the side away from the motor 4.

[0094] In some embodiments, as Figure 15 As shown, the aforementioned double-suction centrifugal fan is installed within the housing 11. The side of the volute 10 facing away from the motor 4 is a first side 112. The housing 11 has a first wall 111 opposite the first side 112. The distance between the first side 112 and the first wall 111 is L2. When L2 is less than 20 mm, the hub of the double-suction centrifugal impeller 100 facing away from the motor 4 is removed.

[0095] In the above example, when L2 is less than 20 mm, the distance between the first side 112 of the volute 10 and the first wall 111 of the fuselage shell 11 is too close, and the air inlet space on the side of the double-suction centrifugal impeller 100 facing away from the motor 4 is extremely limited, resulting in high air duct resistance. At this time, the hub of the double-suction centrifugal impeller 100 facing away from the motor 4 will occupy the air inlet space within the blade assembly, increasing the motor load and reducing the air volume. At this time, by removing the hub of the double-suction centrifugal impeller 100 facing away from the motor 4, the electrode load can be reduced and the air volume can be increased.

[0096] The shaft disc 1 has a first A side 12 and a second A side 13 opposite to each other, with the first A side 12 being closer to the motor 4 than the second A side 13. When the hub of the double-suction centrifugal impeller 100 facing away from the motor 4 is removed, the screw 6 can pass through the shaft disc 1 from the second A side 13 and be threadedly connected to the hub of the double-suction centrifugal impeller 100 on the side closer to the motor 4.

[0097] It should be noted here that: when the above-mentioned L1 is greater than or equal to 20 mm, and L2 is greater than or equal to 20 mm, there is ample air inlet space on both sides of the double-suction centrifugal impeller 100. At this time, the first hub 5A and the second hub 5B do not need to be disassembled. At this time, the screw 6 can pass through the shaft disc 1 from either side of the hub to the other side of the hub.

[0098] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. Such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A double-suction centrifugal wind wheel, comprising a first blade group (2), a second blade group (3) and a hub structure (5), wherein the first blade group (2) and the second blade group (3) are arranged in sequence along the axial direction of the double-suction centrifugal wind wheel, and the hub structure (5) is relatively fixed to the first blade group (2) and the second blade group (3), and is characterized in that: The hub structure (5) has two axial ends respectively comprising a first end (501) and a second end (502), the first end (501) being located within the first blade group (2), and the second end (502) being located within the second blade group (3); The hub structure (5) comprises a first guide section (51) located in the first blade group (2) and a second guide section (52) located in the second blade group (3), wherein the first guide section (51) has the first end (501), and the outer diameter of the first guide section (51) gradually decreases from the first end (501) to the second end (502) along the axial direction of the double-suction centrifugal wind wheel; the second guide section (52) has the second end (502), and the outer diameter of the second guide section (52) gradually decreases from the second end (502) to the first end (501) along the axial direction of the double-suction centrifugal wind wheel.

2. The double-suction centrifugal impeller according to claim 1, characterized in that: The first guide section (51) comprises an end plate (512) located at the first end (501) and a truncated cone barrel section (511) extending from the end plate (512) to the second end (502); The height of the truncated cone barrel section (511) in the axial direction of the double-suction centrifugal impeller (100) is h, the radius of the small-mouth end of the truncated cone barrel section (511) is r1, and the radius of the large-mouth end of the truncated cone barrel section (511) is r2, wherein h / (r2-r1)≥1.

3. The double-suction centrifugal impeller according to claim 1, characterized in that: The double-suction centrifugal impeller further comprises a shaft disc (1) for separating the first blade group (2) and the second blade group (3); the hub structure (5) is fixed on the shaft disc (1); and the hub structure (5) is fixedly connected to the first blade group (2) and the second blade group (3) via the shaft disc (1).

4. The double-suction centrifugal impeller according to claim 3, characterized in that: The invention also includes a bearing (7) for being sleeved and fixed with the external motor shaft (41), wherein the bearing (7) is fixed on the shaft disc (1), and the bearing (7) is located inside the hub structure (5); the hub structure (5) has a through hole (101), and the through hole (101) is used for allowing the external motor shaft (41) to pass through so as to be connected to the bearing (7).

5. The double-suction centrifugal impeller according to claim 4, characterized in that: The shaft hole (701) of the bearing has a flat portion matching surface (71) for matching with the flat portion (411) of the external motor shaft, and a screw hole (72) penetrating to the inner wall of the shaft hole (701) is also provided on the outer wall of the bearing (7).

6. The double-suction centrifugal impeller according to any one of claims 1 to 5, characterized in that: The hub structure (5) comprises a first hub (5A) located in the first blade assembly (2), and the first hub (5A) has the first guide section (51); Wherein, the first hub (5A) is detachable.

7. The double-suction centrifugal impeller according to claim 6, characterized in that: When the double-suction centrifugal impeller has a shaft disc (1), the first hub (5A) is detachably arranged on the shaft disc (1); the first hub (5A) has a first flange (513) on a side facing away from the first end (501), and the first hub (5A) is detachably connected to the shaft disc (1) via the first flange (513).

8. The double-suction centrifugal impeller according to claim 7, characterized in that: The end of the first guide section (51) facing away from the first end (501) has an outer flange, the outer flange forms the first flange (513), and the width of the outer flange is ≥15 mm.

9. The double-suction centrifugal impeller according to claim 7 or 8, characterized in that: One of the first flange (513) and the shaft disc (1) is provided with a positioning column (53), and the other is provided with a positioning hole (102). The positioning column (53) is used to be inserted into the positioning hole (102) to position the first hub (5A).

10. The double-suction centrifugal impeller according to any one of claims 1 to 5, 7 and 8, characterized in that: The hub structure (5) comprises a second hub (5B) located in the second blade assembly (3), and the second hub (5B) has the second guide section (52); Wherein, the second hub (5B) is detachable.

11. The double-suction centrifugal impeller according to claim 10, characterized in that: When the hub structure (5) includes a first hub (5A) located in the first blade assembly (2), the first hub (5A) has the first guide section (51), and the first hub (5A) is detachable, the second hub (5B) and the first hub (5A) are symmetrical structures.

12. The double-suction centrifugal impeller according to claim 11, characterized in that: When the double-suction centrifugal impeller has a shaft disc (1), and the hub structure (5) includes a first hub (5A) located in the first blade group (2), the first hub (5A) has the first guide section (51), the first hub (5A) has a first flange (513) on a side facing away from the first end (501), and the first hub (5A) is detachably connected to the shaft disc (1) via the first flange (513), The second hub (5B) has a second flange (521) on the side facing away from the second end (502), and the second hub (5B) is detachably connected to the shaft disc (1) via the second flange (521); wherein the first flange (513) is detachably connected to the shaft disc (1) via screws (6), and the screws (6) are also connected to the second flange (521), so that the second flange (521) is also detachably connected to the shaft disc (1) via the screws (6).

13. The double-suction centrifugal impeller according to claim 12, characterized in that: When the double-suction centrifugal impeller has a shaft disc (1), and the hub structure (5) includes a first hub (5A) located in the first blade group (2), the first hub (5A) has the first guide section (51), the first hub (5A) has a first flange (513) on the side away from the first end (501), the first hub (5A) is detachably connected to the shaft disc (1) through the first flange (513), and a positioning column (53) is provided on the first flange (513), and the shaft disc (1) is provided with a positioning hole (102), the positioning hole (102) passes through the axial ends of the shaft disc (1), and the second flange (521) is provided with another positioning column (54), the positioning column (53) is used to be inserted from one axial side of the positioning hole (102), and the other positioning column (54) is used to be inserted from the other axial side of the positioning hole (102).

14. A double-suction centrifugal fan, characterized in that: It comprises the double-suction centrifugal impeller according to any one of claims 1-13.

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