Fan

Abstract

The present application provides a fan, which includes a hub and several blades. The several blades are arranged around the hub and along the circumferential direction of the hub. The several blades have at least one connecting portion connected to the blade root, and each of the several blades is in a "T" shape or an "L" shape, and at least one connecting portion is connected to the hub. The fan further includes a front positioning sleeve and a rear positioning sleeve sleeved on the hub. The front positioning sleeve is cylindrical, and its rear end includes several blade front limiting surfaces and several front joint surfaces; the rear positioning sleeve is cylindrical, and its front end includes several blade rear limiting surfaces and several rear joint surfaces. The front positioning sleeve and the rear positioning sleeve are joined through several front joint surfaces and several rear joint surfaces, and several blade limiting openings are formed between the several blade front limiting surfaces and the several blade rear limiting surfaces; each of the several blades is respectively installed in a corresponding one of the several blade limiting openings.

Description

Technical Field

[0001] This application relates to the field of rotating machinery such as fans, and more precisely to the mounting structure of fan blades. Background Art

[0002] In a fan, several blades are circumferentially and uniformly arranged outside a hub (such as the outer rotor of an outer rotor motor). Usually, when installing the blades, the roots of the blades are directly welded to the outside of the hub by an operator or a machine. This mounting structure and mounting method are difficult to ensure the accuracy of the installation of all blades relative to the hub and are not easy to install. Summary of the Invention

[0003] This application provides a fan with blades having connection parts for accurately positioning the installation angle, circumferential arrangement, and axial position of the blades.

[0004] According to the above, this application provides a fan, which includes: a hub; several blades, the several blades surrounding the hub and arranged along the circumference of the hub; wherein, the several blades have at least one connection part, the at least one connection part is connected to the blade root of the blade, and each of the several blades is in a "T" shape or an "L" shape, and the at least one connection part is connected to the hub.

[0005] According to the above, the hub is the outer rotor of an outer rotor motor.

[0006] According to the above, the fan further includes: a front positioning sleeve and a rear positioning sleeve, the front positioning sleeve and the rear positioning sleeve are sleeved on the hub; the front positioning sleeve is cylindrical, and the rear end of the front positioning sleeve includes several blade front limiting surfaces and several front joint surfaces; and the rear positioning sleeve is cylindrical, and the front end of the rear positioning sleeve includes several blade rear limiting surfaces and several rear joint surfaces, wherein, the front positioning sleeve and the rear positioning sleeve are joined through the several front joint surfaces and several rear joint surfaces, and several blade limiting openings are formed between the several blade front limiting surfaces and the several blade rear limiting surfaces; wherein, each of the several blades is respectively installed in a corresponding one of the several blade limiting openings.

[0007] According to the above, the shapes of the several blade limiting openings match the shapes of the outer circumferential contours of the roots of the several blades.

[0008] According to the above, the fan further includes an end positioning sleeve, which includes a cylindrical part and an end cover closing one end of the cylindrical part. The cylindrical part is sleeved on the hub and connected to the front end of the front positioning sleeve. There is a hole on the end cover; a protruding part is provided at the front end of the hub, and the protruding part is connected to the end positioning sleeve through the hole on the end cover.

[0009] According to the above, a protruding part extending in the circumferential direction is provided on the outer surface of the hub, and the rear end of the rear positioning sleeve abuts against the protruding part.

[0010] According to the above, the rear positioning sleeve is connected to the hub.

[0011] According to the above, the rear end of the rear positioning sleeve has a cylindrical part. The rear end of the rear positioning sleeve abuts against the protruding part, and the cylindrical part is connected to the protruding part.

[0012] According to the above, the several blade front limiting surfaces and the several front joint surfaces of the front positioning sleeve are arranged at intervals and extend obliquely relative to the axis of the front positioning sleeve in the direction from the front end to the rear end of the front positioning sleeve; the several blade rear limiting surfaces and the several rear joint surfaces of the rear positioning sleeve are arranged at intervals and extend obliquely relative to the axis of the rear positioning sleeve in the direction from the front end to the rear end of the rear positioning sleeve.

[0013] According to the above, the at least one connecting part is two or more connecting parts arranged along the length direction of the blade root, wherein at least one of the two or more connecting parts extends toward one side of the blade, and the other connecting parts of the two or more connecting parts extend toward the other side of the blade.

[0014] According to the above, the at least one connecting part extending toward one side of the blade and the other connecting parts extending toward the other side of the blade are arranged at intervals.

[0015] According to the above, the at least one connecting part is a connecting part, and the connecting part includes a first connecting plate extending toward one side of the blade and a second connecting plate folded from the first connecting plate and extending toward the other side of the blade. The second connecting plate is connected to the hub.

[0016] According to the above, the at least one connecting part is connected to the hub by screws, bolts or welding. Description of the Drawings

[0017] Figure 1A is a perspective view of an embodiment of the fan 100 of the present application;

[0018] Figure 1B is Figure 1A an exploded view of the perspective view of the fan 100 shown;

[0019] Figure 2 is Figure 1A a perspective view of the rear positioning sleeve 104 of the fan 100 shown;

[0020] Figure 3 is Figure 1A a perspective view of the front positioning sleeve 102 of the fan 100 shown;

[0021] Figure 4 is Figure 2 a perspective view of the rear positioning sleeve 104 shown and Figure 3 the front positioning sleeve 102 shown in the assembled position;

[0022] Figure 5 is Figure 1A a perspective view of the first embodiment of the blade 103 of the fan 100 shown;

[0023] Figure 6 is Figure 1A a perspective view of the second embodiment of the blade 603 of the fan 100 shown;

[0024] Figure 7 is Figure 1A a perspective view of the third embodiment of the blade 703 of the fan 100 shown;

[0025] Figure 8 is Figure 1A-1B a perspective view of the front positioning sleeve 102, the blade 103 and the rear positioning sleeve 104 shown in the assembled position in;

[0026] Figure 9A is Figure 1A a perspective view of another embodiment of the connection mode of the rear positioning sleeve 104 and the hub body 106 of the fan 100 shown;

[0027] Figure 9B is Figure 9A a perspective view of the rear positioning sleeve 104 and the hub body 106 in the assembled position shown;

[0028] Figure 10 is Figure 1A a perspective view and a partial enlarged view of the fourth embodiment of the blade 1003 of the fan 100 shown;

[0029] Figure 11 is Figure 1A a perspective view and a partial enlarged view of the fifth embodiment of the blade 1103 of the fan 100 shown;

[0030] Figure 12 It is an exploded view and a partial enlarged view of another embodiment of the fan 1200 of the present application. Detailed implementation manners

[0031] Various specific implementation manners of the present application will be described below with reference to the drawings forming a part of this specification. It should be understood that although directional terms such as "front", "rear", "upper", "lower", "left", "right", etc. are used in the present application to describe various exemplary structural parts and elements of the present application, these terms are used herein only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the drawings. Since the embodiments disclosed in the present application can be arranged in different directions, these directional terms are used only as illustrations and should not be regarded as limitations.

[0032] Figure 1A It is a perspective view of an embodiment of the fan 100 of the present application. Figure 1B is Figure 1A an exploded view of the perspective view of the fan 100 shown, for showing each component part in the fan 100 and their positional relationships. As Figure 1A and 1B shown, the fan 100 includes an end fastener 113, an end positioning sleeve 101, a front positioning sleeve 102, several blades 103, a rear positioning sleeve 104, a hub 105, and a rear fastener 112. The several blades 103 can be mounted on the hub 105 through the end fastener 113, the end positioning sleeve 101, the front positioning sleeve 102, the rear positioning sleeve 104, and the rear fastener 112.

[0033] Specifically, as Figure 1B shown, the hub 105 includes a hub body 106 and a protrusion 107. The hub body 106 is generally cylindrical and has a central axis X. The protrusion 107 is coaxially arranged at the front end of the hub body 106. When the hub body 106 rotates, the protrusion 107 can rotate therewith. An external thread structure is provided on the free end 120 of the protrusion 107. A protruding portion 108 is provided at the rear end of the hub body 106. The protruding portion 108 extends outward in the circumferential direction of the hub body 106 and in the radial direction of the hub body 106. The rear positioning sleeve 104 can be sleeved on the hub body 106, and the rear end 122 of the rear positioning sleeve 104 can abut against the protruding portion 108. The outer diameter of the protruding portion 108 is configured to be larger than the inner diameter of the rear positioning sleeve 104, so that the rear positioning sleeve 104 can abut against the protruding portion 108 and does not come off from the rear end of the hub body 106.

[0034] As Figure 2As shown, the rear positioning sleeve 104 is coaxially arranged with the hub body 106 and also has a central axis X. The rear positioning sleeve 104 has several holes 115, and the hub body 106 is provided with corresponding holes 114. When the rear positioning sleeve 104 abuts against the protruding portion 108, the holes 114 on the hub body 106 can be aligned with the corresponding holes 115 on the rear positioning sleeve 104. The rear fastener 112 (for example, a screw, a bolt, etc.) can be inserted into the holes 114 and their corresponding holes 115 to fix the rear positioning sleeve 104 on the hub body 106.

[0035] Those skilled in the art can also understand that in some embodiments, the protruding portion 108 may not be provided, and the cooperation of the holes 114, the holes 115 and the rear fastener 112 is used to define the installation position of the rear positioning sleeve 104 in the axial direction of the hub body 106. It can also be understood that the rear positioning sleeve 104 can be fixed on the hub body 106 not by the rear fastener 112 but by welding or other means.

[0036] As Figure 3 shown, the front positioning sleeve 102 is generally cylindrical, also has a central axis X, and is sleeved on the hub body 106 in a coaxial manner with the hub body 106. The rear end of the front positioning sleeve 102 can cooperate with the front end of the rear positioning sleeve 104 to clamp the blade 103. After the blade 103 is clamped by the front positioning sleeve 102 and the rear positioning sleeve 104, it is positioned on the hub body 106. The front end of the front positioning sleeve 102 is provided with an external thread, which can cooperate with the internal thread structure at the rear end of the end positioning sleeve 101.

[0037] The end positioning sleeve 101 includes a cylindrical portion 109 and an end cap 110 that closes one end of the cylindrical portion 109. The rear end of the cylindrical portion 109 is provided with an internal thread (not shown), which can cooperate with the external thread of the front end 305 of the front positioning sleeve 102, so that the end positioning sleeve 101 is connected to the front positioning sleeve 102. The end cap 110 is provided with a hole 111. The length of the protruding portion 107 of the hub 105 is set so that its free end 120 can pass through the hole 111. The end fastener 113 is a nut, which can cooperate with the external thread structure on the free end 120 of the protruding portion 107, so as to connect the front positioning sleeve 102 and the end positioning sleeve 101 to the hub body 106.

[0038] Those skilled in the art can understand that in some embodiments, the front positioning sleeve 102 can be connected to the hub body 106 in a similar manner as the rear positioning sleeve 104 is connected to the hub body 106 (e.g., through the rear fastener 112). For example, holes are provided on the front positioning sleeve 102 and the hub body 106, and the front positioning sleeve 102 is connected to the hub body 106 through fasteners without using the end positioning sleeve 101 and the end fastener 113. In such an example, the protrusion 107 may not be provided on the hub 105 either.

[0039] Those skilled in the art can understand that in some other embodiments, the front positioning sleeve 102 and the rear positioning sleeve 104 can also fix the blade 103 to the hub body 106 in other ways. For example, an external thread is provided on the surface of the front end of the hub body 106, and an internal thread is provided on the inner surface of the front positioning sleeve 102. The front positioning sleeve 102 is threadedly connected to the hub body 106. By rotating the front positioning sleeve 102, it can move axially along the hub body 106 so as to cooperate with the rear positioning sleeve 104 without using the end positioning sleeve 101. Another example is that a sleeve 109 with an internal thread in the shape of a ring can be used and an external thread is provided at the front end of the hub body 106. The sleeve 109 is threadedly connected to the hub body 106. By rotating the sleeve 109, it can translate axially along the hub body 106 to push the front positioning sleeve 102 to translate and cooperate with the rear positioning sleeve 104.

[0040] Figure 2 is Figure 1A a perspective view of the rear positioning sleeve 104 of the wind turbine 100 shown, which is used to more clearly show the specific structure of the rear positioning sleeve 104. As Figure 2 shown, the rear positioning sleeve 104 includes a cylindrical portion 222 located at the rear end 122 of the rear positioning sleeve 104 and several serrated portions 212. The several serrated portions 212 extend from the front end of the cylindrical portion 222 towards the front end 201 of the rear positioning sleeve 104. Each of the several serrated portions 212 is provided with a blade rear limiting surface 202 and a rear joint surface 203. The number of the blade rear limiting surfaces 202 is the same as the number of the blades 103. In Figure 1AIn the illustrated embodiment, the number of blades 103 is five. Accordingly, the number of serrated portions 212, the number of rear joint surfaces 203, and the number of blade rear limiting surfaces 202 are also five. Each serrated portion 212 has a tooth tip and two tooth bottoms (a left tooth bottom and a right tooth bottom). The surface formed by connecting the tooth tip and the left tooth bottom is the blade rear limiting surface 202, and the surface formed by connecting the tooth tip and the right tooth bottom is the rear joint surface 203, so that the blade rear limiting surface 202 and the rear joint surface 203 are arranged at intervals. Those of ordinary skill in the art can easily think of setting the number of blade rear limiting surfaces 202 to be more than the number of blades 103 but only using some of the blade rear limiting surfaces 202 while leaving the other blade rear limiting surfaces 202 unused.

[0041] The shape of each blade rear limiting surface 202 is set to match the shape of the rear surface 514 of the blade root 503 of the blade 103 (as Figure 5 shown), so that when the rear positioning sleeve 104 and the blade 103 are assembled in place, each blade rear limiting surface 202 can be fitted with the rear surface 514 of the blade root 503 of the blade 103. Each blade rear limiting surface 202 and each rear joint surface 203 extend obliquely relative to the axis of the rear positioning sleeve 104 in the direction from the front end 201 to the rear end 122 of the rear positioning sleeve 104. In other words, each blade rear limiting surface 202 is obliquely arranged relative to the central axis X. In the embodiment shown in the present application, each rear joint surface 203 is also obliquely arranged relative to the central axis X.

[0042] Figure 3 is Figure 1A a perspective view of the front positioning sleeve 102 of the wind turbine 100 shown, which is used to more clearly show the specific structure of the front positioning sleeve 102. As Figure 3 shown, the front positioning sleeve 102 includes a cylindrical portion 322 located at the front end 305 of the front positioning sleeve 102 and several serrated portions 312. The several serrated portions 312 extend from the rear end of the cylindrical portion 322 toward the rear end 301 of the front positioning sleeve 102. Each of the several serrated portions 312 is provided with a blade front limiting surface 302 and a front joint surface 303. The number of blade front limiting surfaces 302 is the same as the number of blades 103. In Figure 1AIn the illustrated embodiment, the number of blades 103 is five. Accordingly, the number of serrated portions 312, the number of front blade limiting surfaces 302, and the number of front joint surfaces 303 are also five. Each serrated portion 312 has a tooth tip and two tooth bottoms (a left tooth bottom and a right tooth bottom). The surface formed by connecting the tooth tip and the right tooth bottom is the front blade limiting surface 302, and the surface formed by connecting the tooth tip and the left tooth bottom is the front joint surface 303, such that the front blade limiting surfaces 302 and the front joint surfaces 303 are arranged at intervals. A person of ordinary skill in the art can easily conceive of setting the number of front blade limiting surfaces 302 to be more than the number of blades 103 but only using some of the front blade limiting surfaces 302 and leaving the other front blade limiting surfaces 302 idle.

[0043] The shape of each front blade limiting surface 302 is set to match the shape of the front surface 512 of the blade root 503 of the blade 103 (as Figure 5 shown), such that when the front positioning sleeve 102 and the blade 103 are assembled in place, each front blade limiting surface 302 can be in contact with the front surface 512 of the blade root 503 of the blade 103. Each front blade limiting surface 302 and each front joint surface 303 extend axially with respect to the front positioning sleeve 102 in an inclined manner in the direction from the front end 305 to the rear end 301 of the front positioning sleeve 102. In other words, each front blade limiting surface 302 is inclined with respect to the central axis X. In the embodiment shown in the present application, each front joint surface 303 is also inclined with respect to the central axis X.

[0044] Figure 4 is Figure 2 a perspective view of the rear positioning sleeve 104 and Figure 3 the front positioning sleeve 102 shown in the assembled position, for showing the mating relationship between the rear positioning sleeve 104 and the front positioning sleeve 102. As Figure 4 shown, when the front positioning sleeve 102 and the rear positioning sleeve 104 are assembled in place, each front joint surface 303 abuts against a corresponding rear joint surface 203, and each front blade limiting surface 302 cooperates with a corresponding rear blade limiting surface 202 to form a blade limiting opening 401 therebetween. Since the shape of each front blade limiting surface 302 is set to match the shape of the front surface 512 of the blade root 503 of the blade 103 (as Figure 5 shown), and the shape of each rear blade limiting surface 202 is set to match the shape of the rear surface 514 of the blade root 503 of the blade 103 (as Figure 5 shown), the shape of the several blade limiting openings 401 defined by the several front blade limiting surfaces 302 and the several rear blade limiting surfaces 202 can match the shape of the outer peripheral contour of the blade roots 503 of the several blades 103.

[0045] Those skilled in the art can understand that the rear positioning sleeve 104 and the front positioning sleeve 102 are used to define several blade limiting ports 401, which are used to clamp the blade root 503 of the blade 103 so that the blade 103 can be positioned on the hub body 106 through the rear positioning sleeve 104 and the front positioning sleeve 102. Therefore, the several rear joint surfaces 203 on the rear positioning sleeve 104 and the several front joint surfaces 303 on the front positioning sleeve 102 can be set in any shape so that sufficient support strength can be maintained between the rear positioning sleeve 104 and the front positioning sleeve 102 to clamp the blade 103.

[0046] Figure 5 Is Figure 1A FIG. 6 is a perspective view of the first embodiment of the blade 103 of the wind turbine 100 shown, which is used to more clearly show the specific structure of the blade 103. As Figure 5 shown, the blade 103 includes a blade body 510, a first connecting portion 501 and a second connecting portion 502. The first connecting portion 501 and the second connecting portion 502 are located at the blade root 503 of the blade body 510 and are arranged along the length direction of the blade root 503. The first connecting portion 501 extends from the blade root 503 toward the first side of the blade body 510 (i.e., the side where the front surface 512 of the blade body 510 is located), and the second connecting portion 502 extends from the blade root 503 of the blade body 510 toward the second side of the blade body 510 (i.e., the side where the rear surface 514 of the blade body 510 is located). The shapes of the first connecting portion 501 and the second connecting portion 502 in the length direction of the blade root 503 are generally arc-shaped. Looking at the blade body 510 from the side 530 of the blade 103, the first connecting portion 501 and the second connecting portion 502 are generally in a "T" shape with the blade body 510.

[0047] The first connecting portion 501 and the second connecting portion 502 of the blade 103 can be formed by any process known to those skilled in the art. For example, the blade 103 is flanged to form the first connecting portion 501 and the second connecting portion 502, or the first connecting portion 501 and the second connecting portion 502 are connected to the blade 103 by welding, etc.

[0048] Figure 6 Is Figure 1A FIG. 17 is a perspective view of the second embodiment of the blade 603 of the wind turbine 100 shown, which is used to more clearly show the specific structure of the blade 603. Figure 6 The blade 603 shown and Figure 5The difference between the shown blade 103 is that: the blade 603 has three connecting parts, namely: the first connecting part 601, the second connecting part 602 and the third connecting part 604. The first connecting part 601, the second connecting part 602 and the third connecting part 604 are arranged at intervals. The first connecting part 601 extends from the blade root 605 of the blade 603 towards the first side of the blade 603 (i.e., the side where the front surface 612 of the blade body 610 is located). The second connecting part 602 and the third connecting part 604 extend from the blade root 605 of the blade 603 towards the second side of the blade 603 (i.e., the side where the rear surface 614 of the blade body 610 is located). The shapes of the first connecting part 601, the second connecting part 602 and the third connecting part 604 in the length direction of the blade root 605 are approximately arc-shaped. Looking at the blade body 610 from the side 630 of the blade 603, the first connecting part 601, the second connecting part 602 and the third connecting part 604 are approximately in a "T" shape with the blade body 610.

[0049] The first connecting part 601, the second connecting part 602 and the third connecting part 604 of the blade 603 can be formed by any process known to those skilled in the art. For example, flanging the blade 603 to form the first connecting part 601, the second connecting part 602 and the third connecting part 604, or connecting the first connecting part 601, the second connecting part 602 and the third connecting part 604 to the blade 603 by means of welding or the like.

[0050] Figure 7 Yes Figure 1A It is a perspective view of the third embodiment of the blade 703 of the shown fan 100, which is used to more clearly show the specific structure of the blade 703. Figure 7 The shown blade 703 and Figure 5The difference between the shown blade 103 is that the blade 703 has five connecting parts: a first connecting part 701, a second connecting part 702, a third connecting part 704, a fourth connecting part 705, and a fifth connecting part 706. The first connecting part 701, the second connecting part 702, the third connecting part 704, the fourth connecting part 705, and the fifth connecting part 706 are arranged at intervals. The second connecting part 702 and the fourth connecting part 705 extend from the blade root 707 of the blade 703 towards the first side of the blade 703 (i.e., the side where the front surface 712 of the blade body 710 is located). The first connecting part 701, the third connecting part 704, and the fifth connecting part 706 extend from the blade root 707 of the blade 703 towards the second side of the blade 703 (i.e., the side where the rear surface 714 of the blade body 710 is located). The shapes of the first connecting part 701, the second connecting part 702, the third connecting part 704, the fourth connecting part 705, and the fifth connecting part 706 are approximately arc-shaped in the length direction of the blade root 703. Looking at the blade body 710 from the side 730 of the blade 703, the first connecting part 701, the second connecting part 702, the third connecting part 704, the fourth connecting part 705, and the fifth connecting part 706 are approximately in a "T" shape with the blade body 710.

[0051] The first connecting part 701, the second connecting part 702, the third connecting part 704, the fourth connecting part 705, and the fifth connecting part 706 can be formed by any process known to those skilled in the art. For example, flanging the blade 703 to form the first connecting part 701, the second connecting part 702, the third connecting part 704, the fourth connecting part 705, and the fifth connecting part 706, or connecting the first connecting part 701, the second connecting part 702, the third connecting part 704, the fourth connecting part 705, and the fifth connecting part 706 to the blade 703 by means of welding or the like.

[0052] Those skilled in the art should understand that the number of connecting parts on the blade body is not limited to two, three, or five listed in this application. One or more connecting parts are included within the scope of protection required by this application.

[0053] Those skilled in the art can also understand that although the connecting parts listed in this application are configured to be arranged at intervals and in opposite directions, that is, adjacent connecting parts extend towards the first side and the second side of the blade body respectively, other setting directions are also included within the scope of protection required by this application. As an example, the connecting parts may not be arranged at intervals, that is, some adjacent connecting parts extend towards the same side of the blade body. As another example, each connecting part extends towards the same side, so that looking at the blade body from the side of the blade, the connecting part and the blade body are approximately in an "L" shape.

[0054] Figure 8 YesFigure 1A-1B The perspective view of the front positioning sleeve 102, the blade 103 and the rear positioning sleeve 104 shown in [reference] is in the assembled position, which is used to show the mating relationship among the three. For the sake of convenience of description, taking Figure 8 one blade 103 out of several blades 103 in [reference] as an example, the assembly state of the blade 103 between the front positioning sleeve 102 and the rear positioning sleeve 104 will be exemplarily described. The blade 103 includes a first connecting portion 501 and a second connecting portion 502. As Figure 8 shown, the blade root 503 of the blade 103 is installed in its corresponding blade limiting opening 401. The blade front limiting surface 302 of the front positioning sleeve 102 contacts the front surface 512 of the blade root 503 of the blade 103, and the blade rear limiting surface 202 of the rear positioning sleeve 104 contacts the rear surface 514 of the blade root 503 of the blade 103. The first connecting portion 501 and the second connecting portion 502 are located inside the front positioning sleeve 102 and the rear positioning sleeve 104, while most of the blade body 510 is located outside the front positioning sleeve 102 and the rear positioning sleeve 104. The side surface 522 (see Figure 5 ) of the first connecting portion 501 facing the blade body 510 is configured to be able to fit against the inner wall 304 of the front positioning sleeve 102 (see Figure 3 ). The side surface 523 (see Figure 5 ) of the second connecting portion 502 facing the blade body 510 is configured to be able to fit against the inner wall 204 of the rear positioning sleeve 104 (see Figure 2 ). The first connecting portion 501 of the blade 103 is connected to the front positioning sleeve 102 by welding, and the second connecting portion 502 of the blade 103 is connected to the rear positioning sleeve 104 by welding. Subsequently, the welded-together front positioning sleeve 102, the blade 103 and the rear positioning sleeve 104 can be sleeved on the hub body 106 and installed on the hub body 106 through the rear fastener 112, so that the blade 103 is installed on the hub body 106. In this way, the blade 103 is accurately positioned on the hub body 106 through the front positioning sleeve 102 and the rear positioning sleeve 104.

[0055] Those skilled in the art can understand that in addition to Figure 8 the installation method shown in [reference] of connecting the blade 103 with the front positioning sleeve 102 and the rear positioning sleeve 104 together and then installing them on the hub body 106, the rear positioning sleeve 104, the blade 103 and the front positioning sleeve 102 can also be installed on the hub body 106 in sequence.

[0056] Those skilled in the art can also understand that the connection methods of the first connecting portion 501 with the front positioning sleeve 102 and the second connecting portion 502 with the rear positioning sleeve 104 are not limited to the welding shown in this embodiment, but include any possible connection methods. For example, holes are provided on the connecting portion, and corresponding holes are provided on the front positioning sleeve 102 and the second connecting portion 502, and the first connecting portion 501 is connected to the front positioning sleeve 102 and the second connecting portion 502 is connected to the rear positioning sleeve 104 by screws or bolts.

[0057] Through the front positioning sleeve 102 and the rear positioning sleeve 104, the installation angle and circumferential arrangement of the blade 103 can be accurately positioned and installed. In addition, through the front positioning sleeve 102 and / or the rear positioning sleeve 104, the axial installation position of the blade 103 on the hub body 106 can also be controlled.

[0058] Figure 9A is Figure 1A A perspective view of another embodiment of the connection method between the rear positioning sleeve 104 of the shown fan 100 and the hub body 106; Figure 9B is Figure 9A A perspective view of the rear positioning sleeve 104 and the hub body 106 in the assembled position, used to show another mating method between the rear positioning sleeve 104 and the hub body 106. As Figure 9A shown, the cylindrical portion 222 of the rear positioning sleeve 104 has an annular surface 901. The inner diameter of the cylindrical portion 222 is slightly larger than the outer diameter of the hub body 106 but smaller than the outer diameter of the protruding portion 108 on the hub body 106, so that the rear positioning sleeve 104 can be sleeved on the hub body 106 while the annular surface 901 can abut against the protruding portion 108 of the hub body 106 without slipping out from the rear end of the hub body 106.

[0059] Several mounting holes 904 are provided on the annular surface 901, and the several mounting holes 904 extend towards the front end 201 of the rear positioning sleeve 104. Several corresponding mounting holes 903 are provided on the protruding portion 108 of the hub body 106. When the rear positioning sleeve 104 abuts against the protruding portion 108, the mounting holes 904 on the annular surface 901 can be aligned with the corresponding mounting holes 903 on the protruding portion 108, so that fasteners 902 (for example, screws, bolts, etc.) can be inserted into the mounting holes 904 and their corresponding mounting holes 903 to fix the rear positioning sleeve 104 on the hub body 106.

[0060] Figure 10 is Figure 1A A perspective view and a partial enlarged view of the fourth embodiment of the blade 1003 of the shown fan 100, used to more clearly show the structure of the connecting portion 1000 of the blade 1003. As Figure 10As shown, the blade 1003 includes a blade body 1010 and a connecting portion 1000. The connecting portion 1000 extends from the blade root 1004 of the blade body 1010 towards the first side of the blade 1003 (i.e., the side where the front surface 1012 of the blade body 1010 is located) to form a first connecting plate 1001. Then it is folded by approximately 180° and continues to extend a certain distance towards the second side of the blade 1003 (i.e., the side where the rear surface 1014 of the blade body 1010 is located) to form a second connecting plate 1002. Looking at the blade body 1010 from the side 1030 of the blade 1003, the connecting portion 1000 and the blade body 1010 are generally in a "T" shape.

[0061] Figure 10 The blade 1003 shown can have two different structural configurations and installation methods. This will be elaborated in detail below.

[0062] In the first structural configuration, the side 1022 of the first connecting plate 1001 facing the blade body 1010 is configured to be able to fit against the inner wall 304 of the front positioning sleeve 102 (see Figure 3 ), and the side 1024 of the second connecting plate 1002 facing the blade body 1010 is configured to be able to fit against the inner wall 204 of the rear positioning sleeve 104 (see Figure 2 ).

[0063] When the blade 1003 is assembled and installed with the front positioning sleeve 102 and the rear positioning sleeve 104, first install the blade root 1004 in its corresponding blade limiting opening 401. The blade front limiting surface 302 of the front positioning sleeve 102 contacts the front surface 1012 of the blade root 1004 of the blade 1003, and the blade rear limiting surface 202 of the rear positioning sleeve 104 contacts the rear surface 1014 of the blade root 1004 of the blade 1003. The connecting portion 1000 is located inside the front positioning sleeve 102 and the rear positioning sleeve 104, while most of the blade body 1010 is located outside the front positioning sleeve 102 and the rear positioning sleeve 104. The first connecting plate 1001 of the blade 1003 is connected to the front positioning sleeve 102 by welding, and the second connecting plate 1002 of the blade 1003 is connected to the rear positioning sleeve 104 by welding. Subsequently, the welded-together front positioning sleeve 102, blade 1003, and rear positioning sleeve 104 can be sleeved onto the hub body 106. The rear positioning sleeve 104 is connected to the hub body 106 by using the rear fastener 112, thereby connecting the front positioning sleeve 102, blade 1003, and rear positioning sleeve 104 together to the hub body 106.

[0064] In this way, the blade 1003 is accurately positioned on the hub body 106 through the front positioning sleeve 102 and the rear positioning sleeve 104.

[0065] In the second structural configuration, the side surface 1022 of the first connecting plate 1001 of the connecting portion 1000 facing the blade body 1010 is configured to be able to fit against the inner wall 304 of the front positioning sleeve 102, and the side surface 1026 of the second connecting plate 1002 facing away from the blade body 1010 is configured to be able to fit against the hub body 106.

[0066] When the blade 1003 is cooperatively installed with the front positioning sleeve 102 and the rear positioning sleeve 104, first, the cylindrical portion 222 of the rear positioning sleeve 104 is abutted against the protruding portion 108 of the hub body 106. The rear positioning sleeve 104 is fixed to the hub body 106 by the rear fastener 112. Subsequently, the rear surface 1014 of the blade root 1004 of the blade 1003 is fitted against the blade rear limiting surface 202 of the rear positioning sleeve 104. At this time, the side surface 1026 of the second connecting plate 1002 facing away from the blade body 1010 fits against the hub body 106. The second connecting plate 1002 is connected to the hub body 106 by welding. Subsequently, the front joint surface 303 of the front positioning sleeve 102 is joined to the rear joint surface 203 of the rear positioning sleeve 104. At this time, the blade root 1004 of the blade 1003 is installed in its corresponding blade limiting opening 401. The side surface 1022 of the first connecting plate 1001 facing the blade body 1010 fits against the inner wall 304 of the front positioning sleeve 102. By welding the first connecting plate 1001 to the front positioning sleeve 102, the front positioning sleeve 102, the blade 1003 and the rear positioning sleeve 104 are connected to the hub body 106 together.

[0067] The settings of the front positioning sleeve 102 and the rear positioning sleeve 104 can accurately position the installation angle and axial position of the blade, and can make the placement angles of each blade consistent before welding, so as to ensure that the installation position of the blade is the same as its designed installation position. In this way, when the fan operates, while achieving its designed performance, it can also control the operating noise of the fan and avoid the blade from breaking during the acceleration process.

[0068] Figure 11 Yes Figure 1A FIG. is a perspective view and a partial enlarged view of the fifth embodiment of the blade 1103 of the fan 100, which is used to more clearly show the structure of the connecting portion 1100 of the blade 1103. As Figure 11 shown, the blade 1103 includes a blade body 1110 and a connecting portion 1100. The connecting portion 1100 is an arc-shaped plate, and the connecting portion 1100 is connected to the blade body 1110 by welding. Its welding position is set such that both ends of the connecting portion 1100 protrude from the blade body 1110. In other words, the blade body 1110 is not welded to the ends of the connecting portion 1100. The cooperative installation of the blade 1103 with the front positioning sleeve 102 and the rear positioning sleeve 104 is the same as Figure 10The fitting and installation described in [reference] are similar, and will not be elaborated here.

[0069] Figure 12 FIG. [figure number] is an exploded view and a partial enlarged view of another embodiment of the fan 1200 of the present application, showing the various components and their positional relationships in the fan 1200. As Figure 12 shown, the fan 1200 includes several blades 1203. The structure of the blade 1203 is substantially similar to the structure of the blade 103 with two connecting portions shown in Figure 5 [reference], and will not be elaborated here. Different from the blade 103 shown in Figure 5 [reference], the first connecting portion 1207 and the second connecting portion 1208 of the blade 1203 have holes 1213.

[0070] The fan 1200 further includes a hub 1205 and a fastener 1212. The outer circumferential surface of the hub body 1206 of the hub 1205 has holes 1209 corresponding to the holes 1213. When the holes 1213 on the blade 1203 are aligned with the corresponding holes 1209 on the hub 1205, a fastener 1112 (e.g., a screw, a bolt, etc.) can be inserted into the holes 1213 and 1209 to fix the blade 1203 to the hub 1205. In this embodiment, there is no need for a front positioning sleeve 102 and a rear positioning sleeve 104 to define the installation angle and circumferential arrangement of the blade. Instead, the installation position is defined by the positions of the holes 1213 and their corresponding holes 1209, which can not only simplify the positioning process but also reduce the required positioning components to achieve the desired precise positioning effect.

[0071] Although this embodiment describes the implementation manner with a structure similar to the blade 103 shown in Figure 5 [reference], those skilled in the art can understand that any structure of the blade described in the present application can use this installation and positioning method to simplify the installation process while precisely positioning the blade.

[0072] Those skilled in the art can also understand that although the blade 1203 is fixed to the hub 1205 by taking the fastener 1212 as an example in this embodiment, its connection method is not limited to the screw or bolt connection shown in this embodiment, but includes any possible connection method, such as welding, etc.

[0073] As an example, the hub in the present application can be the outer rotor of an outer rotor motor. The blade is connected to the outer rotor, and when the outer rotor rotates, the blade also rotates accordingly.

[0074] As another example, the hub in the present application can be an inner rotor motor, and the hub body can be a housing connected to the inner rotor and driven by the inner rotor. The blade is connected to the housing, and when the inner rotor rotates, the housing and the blade also rotate accordingly.

[0075] In addition, although the hub in the present application is taken as an example of a cylinder, the hub can be of various shapes. It is only necessary that the shapes of the front positioning sleeve 102, the rear positioning sleeve 104, and / or the components of the blades in contact with the hub match the shape of the hub.

[0076] Although the present application will be described with reference to the specific embodiments shown in the accompanying drawings, it should be understood that the fan of the present application can have many variations without departing from the spirit and scope and background of the teachings of the present application. Those of ordinary skill in the art will also realize that there are different ways to change the structural details in the embodiments disclosed in the present application, all of which fall within the spirit and scope of the present application and the claims.

Claims

1. A fan, characterized in that: the fan includes: hubs (105, 1205); a plurality of blades (103, 603, 703, 1003, 1103, 1203), the plurality of blades (103, 603, 703, 1103, 1203) being arranged around the hub (105, 1205) and along the circumferential direction of the hub (105, 1205); wherein, the plurality of blades (103, 603, 703, 1103, 1203) have at least one connecting portion (501, 502, 601, 602, 604, 701, 702, 704, 705, 706, 1207, 1208), the at least one connecting portion (501, 502, 601, 602, 604, 701, 702, 704, 705, 706, 1207, 1208) being connected to the blade roots (503, 605, 707) of the blades (103, 603, 703, 1103, 1203), and each of the plurality of blades (103, 603, 703, 1103, 1203) being in a "T" shape or an "L" shape, and the at least one connecting portion (501, 502, 601, 602, 604, 701, 702, 704, 705, 706, 1207, 1208) being connected to the hub (105, 1205), and the at least one connecting portion (501, 502, 601, 602, 604, 701, 702, 704, 705, 706, 1207, 1208) being two or more connecting portions (501, 502, 601, 602, 604, 701, 702, 704, 705, 706, 1207, 1208) arranged along the length direction of the blade root (503, 605, 707), wherein at least one of the two or more connecting portions (501, 601, 702, 705, 1207) extends towards one side of the blade (103, 603, 703, 1203), and the other connecting portions (502, 602, 604, 701, 704, 706, 1208) of the two or more connecting portions extend towards the other side of the blade (103, 603, 703, 1203), the fan further includes: a front positioning sleeve (102) and a rear positioning sleeve (104), the front positioning sleeve (102) and the rear positioning sleeve (104) being sleeved on the hub (105); the front positioning sleeve (102) is in a cylindrical shape, and the rear end (301) of the front positioning sleeve (102) includes a plurality of blade front limiting surfaces (302) and a plurality of front joint surfaces (303); and The rear positioning sleeve (104) is cylindrical. The front end (201) of the rear positioning sleeve (104) includes several blade rear limiting surfaces (202) and several rear joint surfaces (203). Among them, the front positioning sleeve (102) and the rear positioning sleeve (104) are joined through the several front joint surfaces (303) and several rear joint surfaces (203), and several blade limiting openings (401) are formed between the several blade front limiting surfaces (302) and the several blade rear limiting surfaces (202); Among them, each of the several blades (103) is respectively installed in a corresponding one of the several blade limiting openings (401), and the several blade front limiting surfaces (302) and the several front joint surfaces (303) of the front positioning sleeve (102) are arranged at intervals and extend obliquely relative to the axis of the front positioning sleeve (102) in the direction from the front end (305) to the rear end (301) of the front positioning sleeve (102); the several blade rear limiting surfaces (202) and the several rear joint surfaces (203) of the rear positioning sleeve (104) are arranged at intervals and extend obliquely relative to the axis of the rear positioning sleeve (104) in the direction from the front end (201) to the rear end (122) of the rear positioning sleeve (104).

2. The blower according to claim 1, characterized in that: the hub (105, 1205) is the outer rotor of an outer rotor motor.

3. The blower according to claim 1, characterized in that: the shapes of the several blade limiting openings (401) match the shapes of the outer circumferential contours of the blade roots (503, 605, 707, 1004) of the several blades (103).

4. The blower according to claim 1, characterized in that: the blower further includes an end positioning sleeve (101). The end positioning sleeve (101) includes a cylindrical portion (109) and an end cap (110) closing one end of the cylindrical portion (109). The cylindrical portion (109) is sleeved on the hub (105) and is connected to the front end (305) of the front positioning sleeve (102). A hole (111) is provided on the end cap (110); a protruding portion (107) is provided at the front end of the hub (105), and the protruding portion (107) is connected to the end positioning sleeve (101) through the hole (111) on the end cap (110).

5. The blower according to claim 1, characterized in that: a circumferentially extending protruding portion (108) is provided on the outer surface of the hub (105), and the rear end (122) of the rear positioning sleeve (104) abuts against the protruding portion (108).

6. The blower according to claim 5, characterized in that: the rear positioning sleeve (104) is connected to the hub (105).

7. The blower according to claim 6, characterized in that: The rear end (122) of the rear positioning sleeve (104) has a cylindrical portion (222). The rear end (122) of the rear positioning sleeve (104) abuts against the protruding portion (108), and the cylindrical portion (222) is connected to the protruding portion (108).

8. The blower according to claim 1, wherein: The at least one connecting portion (501, 601, 702, 705, 1207) extending toward one side of the blade (103, 603, 703, 1203) and the other connecting portions (502, 602, 604, 701, 704, 706, 1208) extending toward the other side of the blade (103, 603, 703, 1203) are spaced apart.

9. The blower according to claim 1, wherein: The at least one connecting portion (501, 502, 601, 602, 604, 701, 702, 704, 705, 706, 1207, 1208) is connected to the hub (105, 1205) by screws, bolts or welding.

Images