COMBINED FAN BLADE STRUCTURE AND EXHAUST DEVICE

Abstract

A combined fan blade structure and exhaust device. The combined fan blade structure (100) includes an inner hub (110), an outer hub (120), a first blade group (130) and a second blade group (140), in which the outer hub (120) is installed coaxially with the inner hub (110), the first blade group (130) is connected to the outer periphery of the outer hub (120), the second blade group (140) is located between the inner hub (110) and the outer hub (120), and the outer hub (120) shields the second blade group (140). This combined fan blade structure improves the exhaust volume and exhaust efficiency of the fan.

Description

[Technical field]

[0001] (Horizontal citation to related application) This disclosure is based on and claims priority from a Chinese patent application having application number 202210405774.7 and filing date April 18, 2022, the contents of which are hereby incorporated by reference in their entirety into this disclosure.

[0002] The present disclosure relates to a combined fan blade structure and exhaust system. [Background technology]

[0003] The statements herein merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0004] In the technical field of fans, axial fans are generally used to meet the needs of large air volume, and the air volume of the axial fan is improved by reducing the hub ratio, which is the ratio between the diameter of the hub and the diameter of the impeller. However, there is a limit to the hub ratio of an axial fan, and a too small hub ratio will result in low exhaust efficiency of the fan, making it impossible for the fan to meet both the needs of large air volume and exhaust efficiency. Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure aims to solve at least one of the technical problems existing in the prior art by proposing a combined fan blade structure and an exhaust device that can improve the air volume and exhaust efficiency of the fan blade structure. [Means for solving the problem]

[0006] A combined fan blade structure according to an embodiment of the first aspect of the present disclosure includes: Inner hub and an outer hub that is coaxial with the inner hub and is provided outside the inner hub; a first blade group connected to an outer peripheral surface of the outer hub and including a plurality of first blades, the plurality of first blades being distributed at intervals along a circumferential direction of the outer hub; and a second blade group connected between the inner hub and the outer hub and including a plurality of second blades, the plurality of second blades being distributed at intervals along the circumferential direction of the inner hub, the outer hub shielding the side of the second blades facing the outer hub.

[0007] The combined fan blade structure according to the embodiments of the present disclosure has at least the following beneficial effects:

[0008] In the combined fan blade structure provided by the embodiments of the present disclosure, the first blade group and the second blade group are respectively located on the inner and outer sides of the outer hub in the radial direction, and both can receive air from the external environment, so that the combined fan blade structure has a large intake area; both the first blade group and the second blade group rotate to form an airflow and discharge the air that has entered from the intake side of the fan blade structure, thereby increasing the air volume of the fan blade structure; the first blade group allows a larger number of first blades to be connected, thereby increasing the air volume of the fan blade structure; the number of second blades is not affected by the size of the hub and is not limited by the hub ratio, and there is no limit on the size of the inner hub; the airflow generated by the first blade group and the second blade group is combined and then discharged; compared with the conventional axial fan, the fan blade structure can generate a larger air volume at the same rotation speed, and the rotation speed required to generate the same air volume is lower, thereby improving the air volume and exhaust efficiency of the fan blade structure.

[0009] According to some embodiments of the present disclosure, the first blade comprises an axial or mixed flow blade, and / or the second blade comprises a centrifugal blade.

[0010] According to some embodiments of the present disclosure, the first blades are axial blades, and projections of adjacent first blades in a plane perpendicular to the axial direction are spaced apart along the circumferential direction; or The first blades are mixed-flow blades, and in a plane perpendicular to the axial direction, the projections of adjacent first blades have an overlap region along the circumferential direction.

[0011] According to some embodiments of the present disclosure, along the exhaust direction, the outer hub is inclined away from the rotation axis of the inner hub.

[0012] According to some embodiments of the present disclosure, along the exhaust direction, the inner hub is inclined away from the rotational axis of the inner hub.

[0013] According to some embodiments of the present disclosure, the opening of the inner hub faces the exhaust side.

[0014] According to some embodiments of the present disclosure, the inner hub includes a first guide portion and a second guide portion connected to each other, the first guide portion being located on the intake side of the inner hub, the second guide portion being positioned radially opposite the outer hub, and the second blade being connected to the second guide portion.

[0015] According to some embodiments of the present disclosure, along the exhaust direction, the first guide portion and / or the second guide portion are inclined away from the rotation axis of the inner hub.

[0016] According to some embodiments of the present disclosure, the acute angles formed by the first guide portion and the second guide portion and the rotation axis of the inner hub gradually decrease along the exhaust direction.

[0017] According to some embodiments of the present disclosure, the first guide portion is axially higher than the intake side of the outer hub.

[0018] According to some embodiments of the present disclosure, the pitch of adjacent second blades in a circumferential direction on the inside of the outer hub is less than the pitch of adjacent first blades in a circumferential direction on the outside of the outer hub.

[0019] According to some embodiments of the present disclosure, a hub ratio between the inner hub and the second blade is less than a hub ratio between the outer hub and the first blade.

[0020] An exhaust device according to an embodiment of a second aspect of the present disclosure includes: A combined fan blade structure according to an embodiment of the first aspect; a guide cover having an intake port and an exhaust port at both ends, the guide cover having a guide chamber inside, the intake port and the exhaust port both communicating with the guide chamber, the combined fan blade structure being accommodated in the guide chamber and being coaxially disposed with the combined fan blade structure; a power member connected to an end of the inner hub proximate the exhaust port and positioned to drive the inner hub to rotate.

[0021] According to some embodiments of the present disclosure, the exhaust device further includes a mounting seat and a plurality of guide blades, both of which are housed within a guide cover, the mounting seat is installed coaxially with the guide cover, the end where the power member and the inner hub are connected passes through the mounting seat, the plurality of guide blades are arranged around the outer periphery of the mounting seat, and the guide blades are connected between the guide cover and the mounting seat.

[0022] According to some embodiments of the present disclosure, the outer wall of the mounting seat is located radially inward of an end of the inner wall of the outer hub that is closer to the exhaust port.

[0023] According to some embodiments of the present disclosure, the mounting seat includes a first connection portion, a second connection portion and a transition portion, the first connection portion being perpendicular to the rotational axis of the inner hub, the second connection portion being circumferentially disposed around the outer periphery of the first connection portion, the transition portion being connected between the first connection portion and the second connection portion, and the transition portion being inclined in a direction away from the rotational axis of the inner hub along the exhaust direction.

[0024] Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will become apparent from the description, or may be learned through the practice of the disclosure.

[0025] In order to more clearly describe the technical solutions of the embodiments of the present disclosure or the prior art, the following briefly introduces the drawings that need to be used in the description of the embodiments or the prior art. It is clear at a glance that the drawings in the following description are merely some embodiments of the present disclosure, and those skilled in the art can obtain other drawings based on these drawings without paying creative labor. [Brief description of the drawings]

[0026] [Figure 1] 1A-1D are schematic diagrams of several embodiments of the combined fan blade structures of the present disclosure; [Diagram 2] FIG. 2 is a top view of the combined fan blade structure of FIG. 1. [Diagram 3] 2A-2C are schematic diagrams of some alternative embodiments of the combined fan blade structures of the present disclosure. [Figure 4] FIG. 4 is a top view of the combined fan blade structure of FIG. 3. [Diagram 5] FIG. 2 is a cross-sectional exhaust schematic diagram of the combined fan blade structure of FIG. 1. [Figure 6] 6A-6C are schematic diagrams of some embodiments of the inner hub of FIG. 5. [Figure 7] 1A-1D are cross-sectional views of some embodiments of exhaust systems of the present disclosure. [Figure 8] FIG. 8 is a schematic diagram of the airflow of the exhaust system of FIG. [Figure 9] FIG. 8 is a schematic three-dimensional view of the exhaust device of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, the embodiments of the present disclosure will be described in detail, and examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout indicate the same or similar elements, or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are used only for interpreting the present disclosure, and should not be understood as limitations on the present disclosure.

[0028] In the description of this disclosure, with regard to descriptions of orientations, e.g., orientations or positional relationships indicated by up, down, front, back, left, right, etc., are orientations or positional relationships shown based on the drawings, are merely for ease of description and simplicity of description of the disclosure, and are not to be understood as limitations on the disclosure, as they do not indicate or imply that the devices or elements described have a particular orientation or must be configured and operated in a particular orientation.

[0029] In the description of this disclosure, some means one or more, plural means two or more, greater than, less than, more than etc. are understood to be exclusive, and greater than, less than, within etc. are understood to be inclusive. References such as first and second are intended only to distinguish technical features and are not intended to be understood as indicating or implying a relative importance or as implicitly indicating the number of the indicated technical features or as implicitly indicating the context of the indicated technical features.

[0030] In the description of the present disclosure, unless otherwise clearly limited, terms such as installation, mounting, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above terms in the present disclosure in light of the specific content of the technical solutions.

[0031] In the description of the present disclosure, a statement referring to terms such as "some embodiments," "schematic embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least some of the embodiments or examples of the present disclosure. In this specification, schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0032] 1 to 4, in an embodiment of the present disclosure, a combined fan blade structure 100 (also called a combined exhaust structure, hereinafter simply referred to as the fan blade structure 100) is provided, and the combined fan blade structure 100 includes an inner hub 110, an outer hub 120, a first blade group 130 and a second blade group 140, the inner hub 110 is installed coaxially with the outer hub 120, the outer hub 120 is provided outside the inner hub 110 and there is a gap between the two, the first blade group 130 is located radially outside the second blade group 140, the first blade group 130 is connected to the outer peripheral surface of the outer hub 120, and the second blade group 140 is located between the inner hub 110 and the outer hub 120. Since the first blade group 130 and the second blade group 140 are located radially on both the inner and outer sides of the outer hub 120, respectively, both can receive air from the external environment, allowing the combined fan blade structure 100 to have a large intake area. Both the first blade group 130 and the second blade group 140 can rotate to form an airflow and exhaust the air that enters from the intake side of the fan blade structure 100, thereby increasing the air volume of the fan blade structure 100.

[0033] Specifically, the first blade group 130 includes a plurality of first blades 131, which are distributed at intervals along the circumferential direction of the outer hub 120, and the second blade group 140 includes a plurality of second blades 141, which are distributed at intervals along the circumferential direction of the inner hub 110, and the second blades 141 are connected to the outer hub 120 and the inner hub 110 on both radial sides of the inner hub 110, respectively, and the inner hub 110 can be connected to a power member, and the first blades 131 and the second blade group 140 can be rotated simultaneously to form an airflow. Specifically, the outer hub 120 shields the side of the second blades 141 facing the outer hub 120 to act as a guide for the airflow, and optionally, the end of the second blades 141 close to the outer hub 120 may be partially connected to the outer hub 120 or may be entirely connected to the outer hub 120. Optionally, the plurality of first blades 131 and the plurality of second blades 141 are both inclined toward the same preset direction from their bases where they are connected to the outer hub 120, and optionally, the preset direction may be a clockwise direction or a counterclockwise direction.

[0034] In addition, in some embodiments of the present disclosure, the first blades 131 are installed as axial blades or cross-flow blades, and the second blades 141 are installed as centrifugal blades, and the number of centrifugal blades is not affected by the size of the hub and is not limited by the hub ratio, so as to meet the design needs of a small hub with many blades; there is no limit to the size of the inner hub 110, so that a small-sized inner hub 110 can be designed; compared to simply installing axial blades, installing the second blades 141 as centrifugal fan blades can increase the number of the second blades 141, which is advantageous for increasing the amount of air; and the outer hub 120 shields the side of the second blades 141 facing the outer hub 120, so that the airflow generated by the second blades 141 can be directed to the fan blades. The first blade group 130 can generate an axial or oblique airflow, and the first blade group 130 is connected to the outer hub 120, which allows the outer hub 120 to be connected to a large number of first blades 131, thereby increasing the air volume of the fan blade structure 100, and the airflows generated by the first blade group 130 and the second blade group 140 are combined and then discharged. Compared with conventional axial fans, the fan blade structure 100 provided by the embodiment of the present disclosure can generate a large air volume at the same rotational speed, and the rotational speed required to generate the same air volume is lower, thereby improving the air volume and exhaust efficiency of the fan blade structure 100.

[0035] In addition, the wind pressure of the airflow generated by the centrifugal blades is large, and when the airflow generated by the second blade group 140 and the airflow generated by the first blade group 130 are mixed, the wind pressure of the mixed airflow can be increased, and therefore the fan blade structure 100 is suitable for an exhaust environment with large wind pressure and large air volume. In the embodiment of the present disclosure, as shown in FIG. 5, the radial airflow generated by the second blade group 140 is guided along the axial direction by the guiding action of the outer hub 120 on the second blade group 140, and the fan blade structure 100 is exhausted in the axial direction, which can be applied to an axial fan, and the wind pressure of the combined airflow of the fan blade structure 100 is increased, which is advantageous for increasing the exhaust speed of the fan blade structure 100.

[0036] In addition, since the linear velocity on the inside of an axial blade is usually smaller than the linear velocity on the outside, the airflow generated by the axial blade has the characteristic that the speed is slow on the inside and fast on the outside. In the embodiment of the present disclosure, by combining the first blade group 130 and the second blade group 140 and not limiting the number of second blades 141, a large volume of airflow can be generated, and the airflow generated by the second blade group 140 can compensate for the shortcoming of the insufficient linear velocity on the inside of the first blade group 130, thereby making the airflow more uniform across the entire exhaust surface of the fan blade structure 100.

[0037] Referring to Figures 1 and 2, in some embodiments, the first blade 131 is an axial flow blade, the first blade group 130 exhausts in an axial direction, the mixed airflow of the first blade group 130 and the second blade group 140 is exhausted in an axial direction, and the fan blade structure 100 exhausts the airflow in an axial direction, and the fan blade structure 100 is suitable for environments with exhaust needs along the axial direction; and referring to Figures 3 and 4, in some other embodiments, the first blade 131 is a diagonal flow blade, the first blade group 130 exhausts in an oblique direction, and the mixed airflow of the first blade group 130 and the second blade group 140 is exhausted in both axial and oblique directions, and the fan blade structure 100 is suitable for environments with exhaust needs along the axial and oblique directions.

[0038] As shown in FIG. 2, when the first blade 131 is an axial flow blade, the projections of adjacent first blades 131 do not overlap in a plane perpendicular to the axial direction, or the projections of adjacent first blades 131 are spaced apart along the circumferential direction in a plane perpendicular to the axial direction. The fan blade structure 100 may be opened in the axial direction and integrally molded by a method such as injection molding, and the processing cost of the fan blade structure 100 is low and assembly of each part is not required, making it easy to use. As shown in FIG. 4, when the first blade 131 is a diagonal flow blade, in a plane perpendicular to the axial direction, the projections of adjacent first blades 131 have an overlapping area along the circumferential direction, and the fan blade structure 100 cannot be opened in the axial direction, but can be opened by sliding (i.e., using a slider to mold a structure that cannot be directly opened), and is integrally molded by a process such as injection molding. Compared with installing the first blade 131 as an axial blade, the diagonal flow blade has a higher processing cost, but the airflow generated at the same rotation speed has a large air volume and wind pressure. Furthermore, even though the first blade 131 is an axial blade or a diagonal flow blade, the first blade group 130 and the second blade group 140 are used in combination, and the fan blade structure 100 can generate an airflow with a large air volume and large wind pressure and exhaust it efficiently.

[0039] As shown in FIG. 5, the outer hub 120 is inclined away from the rotation axis of the inner hub 110 along the exhaust direction, so that the outer hub 120 is inclined toward the outside of the fan blade structure 100 relative to the central axis of the fan blade structure 100, or the outer hub 120 is gradually expanded along the exhaust direction. On the one hand, the second blade 141 is a centrifugal blade, and the airflow generated by the second blade group 140 flows along the radial direction of the fan blade structure 100; the inclined installation of the outer hub 120 can reduce the impact of the second blade group 140 on the outer hub 120; and the outer hub 120 can guide the airflow generated by the second blade group 140 in an oblique direction, so that the airflow can be more easily discharged between the inner hub 110 and the outer hub 120, and the generation of turbulence or noise between the outer hub 120 and the inner hub 110 can be avoided; on the other hand, the airflow generated by the second blade group 140 is discharged obliquely outward, and the airflow generated by the first blade group 130 flows in the axial direction, so that the airflows generated by both can be quickly mixed, and the propulsion of the airflow generated by the second blade group 140 can increase the flow velocity of the mixed airflow.

[0040] In some embodiments, as shown in Figures 5 to 8, the inner hub 110 is inclined away from the rotation axis of the inner hub 110 along the exhaust direction, or the inner hub 110 is gradually enlarged along the exhaust direction. Specifically, the inner hub 110 has only one opening, and the opening faces the exhaust side. The inclined installation of the inner hub 110 is also advantageous for introducing airflow, and can improve the smoothness of intake and exhaust of the fan blade structure 100 and prevent turbulence or noise from occurring between the inner hub 110 and the outer hub 120.

[0041] As shown in FIG. 6, the inner hub 110 has a first guide part 111 and a second guide part 112, and the first guide part 111 and the second guide part 112 are connected together, the first guide part 111 is located on the intake side of the inner hub 110, the second guide part 112 is installed facing the outer hub 120 in the radial direction of the outer hub 120, and both sides of the second blade 141 are respectively connected to the inside of the outer hub 120 and the outside of the second guide part 112. Both the first guide part 111 and the second guide part 112 can guide the outside air, so that the outside air enters between the inner hub 110 and the outer hub 120, and the first guide part 111 can be used to connect a power member, which provides power to the fan blade structure 100 through the power member, and generates airflow in the fan blade structure 100.

[0042] Specifically, in some embodiments, the first guide portion 111 is inclined away from the rotation axis of the inner hub 110, i.e., the first guide portion 111 is inclined from the intake side to the exhaust side of the fan blade structure 100, and the size of the first guide portion 111 along the radial direction of the outer hub 120 gradually increases, so that the first guide portion 111 guides the air in the external environment, and quickly guides the air that enters the fan blade structure 100 to the outer periphery of the inner hub 110 and enters between the inner hub 110 and the outer hub 120, so that the air forms an airflow through the rotation of the second blade group 140, thereby improving the exhaust efficiency of the fan blade structure 100.

[0043] The cross section of the first guide part 111 along the axial direction of the fan blade structure 100 may be triangular or arc-shaped, i.e., the first guide part 111 may be a cone surface or a sphere, etc., to realize rapid guidance of the air. In some embodiments, the cross section of the first guide part 111 is arc-shaped, and the first guide part 111 and the second guide part 112 smoothly transition at the connection point, and the air may flow along the outer surface of the inner hub 110, which can avoid turbulence in the air flow, and thus reduce the noise of the fan blade structure 100.

[0044] Furthermore, along the exhaust direction of the fan blade structure 100, the second guide portion 112 is inclined toward the direction away from the rotation axis of the inner hub 110, and the outside air flows quickly to the second guide portion 112 due to the guiding action of the first guide portion 111, and the second guide portion 112 draws the airflow generated in the second blade group 140 outward at an angle, and the guiding action of the second guide portion 112 allows the airflow generated in the second blade group 140 to quickly mix with the airflow generated in the first blade group 130. In addition, since both the outer hub 120 and the second guide portion 112 are inclined toward the outside of the fan blade structure 100, the oblique guide effect on the airflow generated in the second blade group 140 is improved, and the airflow generated in the first blade group 130 and the second blade group 140 can be easily mixed quickly.

[0045] In some embodiments, the acute angle between the first guide portion 111 and the second guide portion 112 and the rotation axis of the inner hub 110 gradually decreases along the exhaust direction, i.e., the first guide portion 111 and the second guide portion 112 are smoothly connected in an arc and both protrude away from the rotation axis, which is advantageous for guiding the air flow along the outer surface of the inner hub 110 and can promote mixing of the airflow generated by the second blade group 140 and the airflow generated by the first blade group 130.

[0046] In some embodiments, the first guide portion 111 is axially higher than the intake side of the outer hub 120 to optimize the steering angle of the airflow in the middle part of the second blade group 140, for example, the airflow in the middle part of the centrifugal fan blade can increase the steering angle on the intake side. The first guide portion 111 in this embodiment is axially higher than the intake side of the outer hub 120 to enhance the guiding effect and improve the smooth intake and exhaust of the air duct between the inner hub 110 and the outer hub 120.

[0047] In some embodiments, the pitch of adjacent second blades 141 in the inner circumferential direction of the outer hub 120 is smaller than the pitch of adjacent first blades 131 in the outer circumferential direction of the outer hub 120, i.e., the second blades 141 are arranged more densely than the first blades 131. Since the second blades 141 are centrifugal blades, the number of second blades 141 and the size of the inner hub 110 are not limited by the hub ratio. By installing a large number of second blades 141, the exhaust volume of the second blade group 140 can be improved, and thus the air volume of the entire fan blade structure 100 can be improved. In addition, since the hub ratio between the inner hub 110 and the second blades 141 is smaller than the hub ratio between the outer hub 120 and the first blades 131, the second blade group 140 can generate an airflow with a larger air volume and wind pressure than the first blade group 130, and the air volume and wind pressure of the fan blade structure 100 are effectively improved compared to conventional axial fans.

[0048] 7 and 8, an embodiment of the present disclosure further provides an exhaust device, which includes the above-mentioned combined exhaust structure 100, and further includes a guide cover 200 and a power member 300, both ends of the guide cover 200 are provided with an inlet 210 and an outlet 220 respectively, the inside of the guide cover 200 has a guide chamber 230, both the inlet 210 and the outlet 220 are connected to the guide chamber 230, the combined fan blade structure 100 is accommodated in the guide chamber 230 and is coaxially disposed with the guide cover 200, the outside air enters the guide chamber 230 through the inlet 210, the power member 300 is connected to the end of the inner hub 110 close to the outlet 220, the power member 300 is arranged to drive the inner hub 110 to rotate, an airflow is formed during the rotation of the first blade group 130 and the second blade group 140, and the air passes through the fan blade structure 100 to form an airflow and is discharged from the outlet 220.

[0049] As shown in FIG. 8, the guide cover 200 is installed coaxially with the inner hub 110 and the outer hub 120, and the power member 300 is connected to the exhaust side of the fan blade structure 100 and is located at the center position of the fan blade structure 100. Due to the guiding action of the guide cover 200 and the power member 300, the airflow discharged from the exhaust port 220 by the exhaust device is distributed within an annular area and discharged along the axial direction of the guide cover 200. Due to the constraints of the guide cover 200 and the power member 300, the exhaust device has good airflow linearity and is suitable for axial exhaust and blowing to a fixed area.

[0050] As shown in FIG. 7 and FIG. 9, the exhaust device further includes a mounting seat 400 and a plurality of guide blades 500, the mounting seat 400 and the plurality of guide blades 500 are all housed in the guide cover 200, the mounting seat 400 is installed coaxially with the guide cover 200, one end of the mounting seat 400 is connected to the inner hub 110, the end where the power member 300 and the inner hub 110 are connected passes through the mounting seat 400, the mounting seat 400 is configured to support and mount the power member 300, and the plurality of guide blades 500 are arranged in a guide cover 200. The guide blade 500 is installed around the outer periphery of the mounting seat 400, and both radial ends of the guide blade 500 are connected to the guide cover 200 and the mounting seat 400, respectively. The guide blade 500 connects the guide cover 200 and the mounting seat 400, and at the same time acts as a guide for the airflow, improving the concentricity of the mounting seat 400 and the guide cover 200 and the strength of the entire structure of the mounting seat 400 and the guide cover 200, and discharging the airflow in the guide chamber 230 along the axial direction of the guide cover 200.

[0051] Furthermore, the guide blades 500 are uniformly distributed along the circumferential direction of the mounting seat 400, and the guide blades 500 guide the airflow in the guide chamber 230, thereby improving the uniformity of the airflow at the exhaust port 220. Optionally, the end of the guide cover 200 at the intake port 210 is flared to allow the outside air to enter the guide chamber 230.

[0052] Specifically, the mounting seat 400 includes a first connecting portion 410 and a second connecting portion 420, the first connecting portion 410 is perpendicular to the rotation axis of the inner hub 110, the second connecting portion 420 is annular and connected to the outer periphery of the first connecting portion 410, the first connecting portion 410 abuts against the power member 300, and the second connecting portion 420 is connected to the guide blade 500. Specifically, as shown in Figs. 6 and 7, the inner hub 110 includes a mounting portion 113, the mounting portion 113 is connected to the inside of the first guide portion 111, and the first connecting portion 410 has a through hole, which is used for the output end of the power member 300 to pass through and the output end of the power member 300 is inserted into the mounting portion 113, thereby realizing power transmission from the power member 300 to the inner hub 110.

[0053] In addition, in the radial direction of the outer hub 120, the outer wall of the mounting seat 400 is located inside the end of the inner wall of the outer hub 120 close to the exhaust port 220, preventing the mounting seat 400 from blocking the exhaust of the second blade group 140, and the mounting seat 400 further includes a transition portion 430, both ends of which are connected to the first connecting portion 410 and the second connecting portion 420 respectively, and the transition portion 430 is inclined away from the rotation axis of the inner hub 110 along the exhaust direction, and the transition portion 430 acts as a guide for the fan blade structure 100 to discharge the airflow, and guides the airflow between the second connecting portion 420 and the guide cover 200, so that the airflow is discharged in the axial direction of the guide cover 200.

[0054] Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the present disclosure is not limited to the above embodiments, and various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present disclosure. In addition, the embodiments of the present disclosure and the features of the embodiments may be combined with each other if there is no conflict. [Explanation of symbols]

[0055] 100 Combined Fan Blade Structure 110 Inner Hub 111 First guide part 112 Second guide part 113 Mounting part 120 outer hub 130 First Blade Group 131 The First Blade 140 Second Blade Group 141 The Second Blade 200 Guide cover 210 Air Intake 220 Exhaust port 230 Guide Chamber 300 Power Components 400 Mounting seat 410 First Connection 420 Second Connection 430 Transient part 500 Guide Blade

Claims

1. 1. A combined fan blade structure, comprising: An inner hub (110); an outer hub (120) that is coaxial with the inner hub (110) and is provided outside the inner hub (110); a first blade group (130) connected to an outer peripheral surface of the outer hub (120) and including a plurality of first blades (131), the plurality of first blades (131) being distributed at intervals along a circumferential direction of the outer hub (120); a second blade group (140) connected between the inner hub (110) and the outer hub (120) and including a plurality of second blades (141), the plurality of second blades (141) being distributed at intervals along the circumferential direction of the inner hub (110), and the outer hub (120) shielding the side of the second blades (141) facing the outer hub (120); Combination fan blade structure.

2. The first blade (131) comprises an axial blade or a mixed flow blade, and the second blade (141) comprises a centrifugal blade; The combined fan blade structure of claim 1 .

3. the first blades (131) are axial flow blades, and projections of adjacent first blades (131) in a plane perpendicular to the axial direction are spaced apart along the circumferential direction; Alternatively, the first blade (131) is a mixed flow blade, and in a plane perpendicular to the axial direction, projections of adjacent first blades (131) have an overlapping area along the circumferential direction. The combined fan blade structure according to claim 1 or 2.

4. Along the exhaust direction, the outer hub (120) is inclined in a direction away from the rotation axis of the inner hub (110). The combined fan blade structure according to any one of claims 1 to 3.

5. Along the exhaust direction, the inner hub (110) is inclined in a direction away from the rotation axis of the inner hub (110). The combined fan blade structure according to any one of claims 1 to 4.

6. The opening of the inner hub (110) faces the exhaust side. The combined fan blade structure according to any one of claims 1 to 5.

7. The inner hub (110) includes a first guide portion (111) and a second guide portion (112) which are connected to each other, the first guide portion (111) is located on the intake side of the inner hub (110), the second guide portion (112) is installed facing the outer hub (120) in the radial direction of the outer hub (120), and the second blade (141) is connected to the second guide portion (112). The combined fan blade structure according to any one of claims 1 to 6.

8. At least one of the first guide portion (111) and the second guide portion (112) is inclined in a direction away from the rotation axis of the inner hub (110) along the exhaust direction. The combined fan blade structure of claim 7.

9. Along the exhaust direction, the acute angles between the first guide portion (111) and the second guide portion (112) and the rotation axis of the inner hub (110) gradually decrease.

9. The combined fan blade structure according to claim 7 or 8.

10. The first guide portion (111) is axially higher than the intake side of the outer hub (120). The combined fan blade structure according to any one of claims 7 to 9.

11. the pitch of adjacent second blades (141) in the inner circumferential direction of the outer hub (120) is smaller than the pitch of adjacent first blades (131) in the outer circumferential direction of the outer hub (120); The combined fan blade structure according to any one of claims 1 to 10.

12. a hub ratio between the inner hub (110) and the second blade (141) is smaller than a hub ratio between the outer hub (120) and the first blade (131); The combined fan blade structure according to any one of claims 1 to 11.

13. 1. An exhaust system comprising: A combined fan blade structure (100) according to any one of claims 1 to 12; A guide cover (200) having an intake port (210) and an exhaust port (220) at both ends, the guide cover (200) having a guide chamber (230) inside, the intake port (210) and the exhaust port (220) both communicating with the guide chamber (230), the combined fan blade structure (100) being accommodated in the guide chamber (230), and the combined fan blade structure (100) being coaxially installed; a power member (300) connected to an end of the inner hub (110) proximate the exhaust port (220) and arranged to drive the inner hub (110) to rotate. Exhaust system.

14. The mounting seat (400) and a plurality of guide blades (500) are further included. The mounting seat (400) and the plurality of guide blades (500) are both housed within the guide cover (200), the mounting seat (400) is installed coaxially with the guide cover (200), the end where the power member (300) and the inner hub (110) are connected passes through the mounting seat (400), the plurality of guide blades (500) are installed around the outer periphery of the mounting seat (400), and the guide blades (500) are connected between the guide cover (200) and the mounting seat (400).

14. An exhaust system according to claim 13.

15. The outer wall of the mounting seat (400) is located radially inside the end of the inner wall of the outer hub (120) that is closer to the exhaust port (220).

15. An exhaust system according to claim 14.

16. The mounting seat (400) includes a first connection portion (410), a second connection portion (420) and a transition portion (430), the first connection portion (410) is perpendicular to the rotation axis of the inner hub (110), the second connection portion (420) is provided around the outer periphery of the first connection portion (410), the transition portion (430) is connected between the first connection portion (410) and the second connection portion (420), and the transition portion (430) is inclined in a direction away from the rotation axis of the inner hub (110) along the exhaust direction.

16. An exhaust system according to claim 14 or 15.

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