Axial flow impeller

Abstract

The utility model discloses an axial flow impeller which comprises an upper hub and a lower hub which are used for fixing the angles of blades, the upper hub and the lower hub are detachably connected, a first half hole is formed in the bottom face of the upper hub, a second half hole is formed in the bottom face of the lower hub, and after the upper hub and the lower hub are connected, the first half hole and the second half hole are communicated with each other. The first half hole and the second half hole form a connecting hole, a blade handle is arranged at the end of the blade, and the blade handle is located in the connecting hole. Due to the novel movable blade and blade handle connecting structure, the blade angle can be adjusted at will, and generalization is extremely high. A movable blade and a hub can theoretically correspond to countless air volume points. Compared with an implementation mode of fixed angle adjustment, the types of blades and hubs can be reduced to the maximum extent, mass production can be easily achieved, and the cost of a single piece is reduced. The types of hubs and movable blades are reduced, and the management cost of a company is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, and more specifically, to an axial flow impeller. Background Art

[0002] Axial flow fans are an important part of China's industrial development. In people's lives, they play an irreplaceable and important role and have an extremely wide range of applications. The diameters of the impellers vary from a few centimeters to over a hundred meters. The impeller diameter of the large onshore wind turbines independently developed in China has even reached an astonishing 230 meters. They can be used in places such as mine ventilation, air conditioning heat dissipation, metallurgy, chemical industry, light industry, food, pharmaceutical equipment, mechanical equipment, and civil buildings, covering all aspects of life.

[0003] The blade angles of axial flow fans can be adjusted and improved according to different performance requirements. For the same set of blades and hubs, more than a dozen different design schemes can be configured. If each scheme is produced separately, it will not only lack universality but also greatly increase the design and processing costs of axial flow fans.

[0004] Therefore, we provide a variable blade angle adjustable axial flow fan, whose impeller structure mainly consists of a hub and moving blades. The moving blades and the hub cooperate with each other to form a complete axial flow impeller. Currently, during long-term use, the angles and positions of the moving blades of the variable blade angle adjustable axial flow impellers actually applied in this industry will change due to loosening, resulting in relative rotation between the blades and the hub. Therefore, how to prevent the moving blades from loosening is the technical problem to be solved by this invention. Summary of the Utility Model

[0005] A series of simplified concepts are introduced in the Summary of the Utility Model section, which will be further elaborated in the Detailed Description section. The Summary of the Utility Model section of the present utility model does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, the present utility model provides an axial flow impeller, including: an upper hub and a lower hub for fixing the blade angle, the upper hub and the lower hub are detachably connected, a first half-hole is provided on the bottom surface of the upper hub, a second half-hole is provided on the bottom surface of the lower hub, when the upper hub and the lower hub are connected, the first half-hole and the second half-hole form a connection hole, and a blade handle is provided at the end of the blade, and the blade handle is located in the connection hole.

[0007] Preferably, a plurality of card slots are provided on the outer wall of the blade handle, and at least one limiting block is provided in the connection hole. When the upper hub and the lower hub are connected, the limiting block is located in the card slot.

[0008] Preferably, a plurality of clamping strips are provided on the outer wall of the petiole, and the clamping strips extend axially away from the blade from the connection between the petiole and the blade.

[0009] Preferably, the cross-section of the clamping strip is triangular, and one angle of the triangle is located on the extension of the diameter of the circle of the cross-section of the petiole.

[0010] Preferably, the hardness of the material of the clamping strip is not less than the hardness of the material of the inner wall of the connection hole.

[0011] Preferably, a limiting member is provided at one end of the petiole away from the blade, a third semi-hole is provided on the inner wall of the first semi-hole, and a fourth semi-hole is provided on the inner wall of the second semi-hole. When the upper hub and the lower hub are connected, the third semi-hole and the fourth semi-hole form a limiting groove adapted to the limiting member.

[0012] Preferably, the limiting member is an annular limiting member, and the diameter of the annular limiting member is greater than the diameter of the petiole, and the limiting groove is an annular groove.

[0013] Preferably, the upper hub and the lower hub are connected by screws.

[0014] Compared with the prior art, the utility model has at least the following beneficial effects:

[0015] Safe and reliable: The new petiole connection structure adopts a barb structure, which greatly improves the safety and reliability of the product. Once the upper and lower hubs are clamped, the barbs are embedded in the hubs, and the moving blade can no longer rotate or move. High versatility: The new moving blade petiole connection structure allows the blade angle to be adjusted arbitrarily, with extremely high generalization. One type of moving blade and hub can theoretically correspond to countless air volume points. Good economy: Compared with the implementation method of fixed angle adjustment, the types of blades and hubs can be minimized to the greatest extent, mass production can be easily achieved, and the unit cost can be reduced. The reduction in the types of hubs and moving blades further reduces the company's management costs.

[0016] For the axial flow impeller described in the utility model, other advantages, objectives and features of the utility model will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification. They are used together with the embodiments of the utility model to explain the utility model, and do not constitute a limitation to the utility model. In the drawings:

[0018] Figure 1Schematic diagram of the axial flow impeller of the present utility model located within two hubs.

[0019] Figure 2 is Figure 1 exploded view of.

[0020] Figure 3 Schematic diagram of the handle of the axial flow impeller of the present utility model in the first embodiment.

[0021] Figure 4 Schematic diagram of the handle of the axial flow impeller of the present utility model in the second embodiment.

[0022] Figure 5 is Figure 4 schematic diagram from another perspective.

[0023] Figure 6 Schematic diagram of the handle of the axial flow impeller of the present utility model in the third embodiment (without a limiting member).

[0024] Figure 7 Schematic diagram of the handle of the axial flow impeller of the present utility model in the third embodiment (with a limiting member).

[0025] Figure 8 Schematic diagram of the axial flow impeller of the present utility model in the third embodiment before the upper and lower hubs are connected.

[0026] Figure 9 Schematic diagram of the axial flow impeller of the present utility model in the third embodiment after the upper and lower hubs are connected.

[0027] Figure 10 is Figure 9 enlarged view of A in.

[0028] In the figure: 1 upper hub, 2 lower hub, 3 blades, 4 handle, 41 card slot, 42 card strip, 5 limiting member. Specific embodiments

[0029] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments, so that those skilled in the art can implement it with reference to the text of the specification.

[0030] It should be understood that terms such as "having", "comprising", and "including" as used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0031] Such as Figures 1-10As shown in the figure, the utility model provides an axial flow impeller, which includes an upper hub 1 and a lower hub 2 for fixing the angle of the blade 3. The upper hub 1 and the lower hub 2 are detachably connected. A first semi-hole is provided on the bottom surface of the upper hub 1, and a second semi-hole is provided on the bottom surface of the lower hub 2. When the upper hub 1 and the lower hub 2 are connected, the first semi-hole and the second semi-hole form a connection hole. The end of the blade 3 is provided with a petiole 4, and the petiole 4 is located in the connection hole. The upper hub 1 and the lower hub 2 are connected by screws.

[0032] A limiting member 5 is provided at one end of the petiole 4 away from the blade 3. A third semi-hole is provided on the inner wall of the first semi-hole, and a fourth semi-hole is provided on the inner wall of the second semi-hole. When the upper hub 1 and the lower hub 2 are connected, the third semi-hole and the fourth semi-hole form a limiting groove adapted to the limiting member 5. The limiting member 5 is an annular limiting member 5, and the diameter of the annular limiting member 5 is greater than the diameter of the petiole4. The limiting groove is an annular groove. This enables the petiole 4 to be directly clamped and fixed by the clamping force of the upper hub 1 and the lower hub 2 in the radial direction of the hub rotation axis, and can also be limited in the radial direction of the hub rotation axis by the limiting member 5 to prevent it from being thrown out during rotation. For the convenience of explaining the subsequent technical solutions, the petiole 4 provided with the limiting member 5 will be used as an example in the following.

[0033] The utility model clamps and fixes the petiole 4 through the upper and lower hubs, thereby realizing the fixed angle and position of the blade 3, and further achieving the effect of preventing loosening. At the same time, the connection structure between the blade 3 and the hub is reduced. Since the upper and lower hubs are of a split structure, in order to facilitate the adjustment of the angle of the blade 3, the petiole 4 is usually designed with a cylindrical structure, which is convenient for it to be placed in the connection hole and can be fixed through the connection hole. At the same time, the angle of the blade 3 can be adjusted by rotation. From this, two ways of adjusting the angle of the blade 3 are derived, namely fixed angle adjustment and non-fixed angle adjustment. Because of the different angle adjustment methods, the corresponding axial flow impellers are also different. We provide three different axial flow impellers to solve the problem of blade 3 loosening when different angle adjustments are adopted.

[0034] The first implementation method belongs to non-fixed angle adjustment, such as Figure 2 、 3As shown, there is no limiting structure between the blade 3 and the hub, and there is no angular limitation when adjusting the angle, so it can be adjusted arbitrarily. The angle of the blade 3 is completely ensured by the clamping force of the upper and lower hubs. Correspondingly, in this embodiment, the clamping force provided by the upper and lower hubs and the radial limitation of the rotation axis of the hub provided by the limiting groove play a role in preventing the blade 3 from falling off and loosening. It should be noted that the upper and lower hubs can only clamp the petiole 4 (regardless of whether the limiting member 5 is provided), or can clamp the limiting member 5.

[0035] The second implementation method belongs to fixed-angle adjustment. As Figure 4 , 5 shown, a plurality of card slots 41 are provided on the outer wall of the petiole 4, and at least one limiting block is provided in the connection hole. When the upper hub 1 is connected to the lower hub 2, the limiting block is located in the card slot 41. In this embodiment, the angle of the blade 3 is adjusted and fixed by the limiting block to prevent relative rotation between the blade and the hub after the impeller is assembled. It should be noted that the card slot 41 can be provided on the outer side wall of the petiole 4 (the limiting block is correspondingly provided on the inner wall of the connection hole), or can be provided on the outer side wall of the limiting member 5 (the limiting block is correspondingly provided on the inner wall of the limiting groove).

[0036] In the above two implementation methods, the first implementation method (without fixed-angle adjustment) can be adjusted to any angle according to needs, and has a wide application range. However, because there is no limitation of the limiting block, if used for a long time, the phenomenon of the blade 3 rotating is likely to occur, and this implementation method has extremely high requirements for the surface roughness of the petiole 4, the roughness of the hub, and the tightening torque of the hub (when the two hubs are connected by screws). Otherwise, it is easy to cause the blade 3 to rotate, thereby causing harm to the equipment and personnel, and there are great safety hazards. The second implementation method (fixed-angle adjustment) has higher reliability, and the limiting block well ensures the reliability after the petiole 4 is clamped. However, this implementation method limits the application range (the angle adjustment is limited, usually only 4 or 5 use angles, which limits the use range of the blade 3).

[0037] Therefore, we provide a third implementation method so that the blade 3 can not only be adjusted at non-fixed angles, but also has a high firmness in connection with the hub to avoid loosening. A plurality of card strips 42 are provided on the outer wall of the petiole 4, and the card strips 42 extend axially away from the blade 3 from the connection part of the petiole 4 and the blade 3. The cross-section of the card strip 42 is triangular, forming a barbed spine. The connection part of the card strip 42 and the outer wall of the petiole 4 is one side of the triangle, and the angle opposite to this side is located on the extension line of the diameter of the circular cross-section of the petiole 4, as Figures 8-10 shown. The material hardness of the card strip 42 is not less than the material hardness of the inner wall of the connection hole. During assembly, as Figure 8 ,9 As shown, the clip strip 42 (thorn) at the petiole 4 will pierce the inner wall of the connection hole under the strong clamping force of the upper and lower hubs, and the petiole 4 and the connection hole are in an embedded state through destructive connection, which not only ensures that the angle of the blade 3 can be adjusted as needed, but also ensures that the relative position of the blade 3 and the hub will not change, and the connection is solid and reliable. And after one use, the inner wall of the connection hole will leave a groove pressed by the thorn, so that when it is used next time, it can be used as a fixed angle adjustment implementation method (let the clip strip 42 be inserted into the pressed groove) or as a non-fixed angle adjustment implementation method (let the clip strip 42 be re-inlaid with the inner wall of the connection hole).

[0038] Through the above technical solution, not only the angle of the blade 3 can be adjusted at will, but also extremely high safety and reliability can be taken into account, and it has the following advantages:

[0039] 1. Safe and reliable: The new petiole 4 connection structure adopts a rib structure, which greatly improves the safety and reliability of the product. Once the upper and lower hubs are clamped, the ribs sink into the hubs, and the moving blades can no longer rotate or move. If the ribs adopt an X-shaped cross design, the limiter 5 can also be omitted.

[0040] 2. High versatility: The blade angle can be adjusted arbitrarily, and it is highly versatile.

[0041] 3. Good economic efficiency: Compared with the fixed angle adjustment implementation method, it can reduce the types of blades and hubs to the maximum extent, and can easily achieve mass production, reducing the cost of each unit. The reduction in the types of hubs and moving blades can further reduce the company's management costs.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In the present utility model, unless otherwise clearly specified or limited, 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 integrated; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. 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] Although the embodiments of the present utility model have been disclosed as above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present utility model. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present utility model is not limited to the specific details and the examples shown and described herein.

Claims

1. An axial flow impeller, characterized in that, Comprising: An upper hub (1) and a lower hub (2) for fixing the angle of the blade (3), the upper hub (1) and the lower hub (2) being detachably connected, a first semi-hole being provided on the bottom surface of the upper hub (1), and a second semi-hole being provided on the bottom surface of the lower hub (2). When the upper hub (1) is connected to the lower hub (2), the first semi-hole and the second semi-hole form a connection hole, and a petiole (4) is provided at the end of the blade (3), and the petiole (4) is located within the connection hole.

2. The axial flow impeller according to claim 1, wherein A plurality of card slots (41) are provided on the outer wall of the petiole (4), and at least one limiting block is provided within the connection hole. When the upper hub (1) is connected to the lower hub (2), the limiting block is located within the card slot (41).

3. The axial flow impeller according to claim 1, characterized in that, A plurality of card strips (42) are provided on the outer wall of the petiole (4), and the card strips (42) extend axially in a direction away from the blade (3) from the connection between the petiole (4) and the blade (3).

4. The axial flow impeller according to claim 3, characterized in that, The cross-section of the card strip (42) is triangular, and one angle of the triangle is located on the extension of the diameter of the circle of the cross-section of the petiole (4).

5. The axial flow impeller according to claim 4, wherein, The material hardness of the card strip (42) is not less than the material hardness of the inner wall of the connection hole.

6. The axial flow impeller according to any one of claims 2-5, characterized in that, A limiting member (5) is provided at one end of the petiole (4) away from the blade (3), a third semi-hole is provided on the inner wall of the first semi-hole, and a fourth semi-hole is provided on the inner wall of the second semi-hole. When the upper hub (1) is connected to the lower hub (2), the third semi-hole and the fourth semi-hole form a limiting groove adapted to the limiting member (5).

7. The axial flow impeller according to claim 6, characterized in that, The limiting member (5) is an annular limiting member (5), and the diameter of the annular limiting member (5) is greater than the diameter of the petiole (4), and the limiting groove is an annular groove.

8. The axial flow impeller according to claim 1, characterized in that, The upper hub (1) and the lower hub (2) are connected by screws.

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