Combined fan and motor assembly with same

Abstract

The utility model provides a combined fan and a motor assembly with the same, the combined fan is used for being arranged in a fan cover of the motor assembly and comprises a central part, a connecting part, a plurality of axial flow fan blades and a plurality of centrifugal fan blades which are connected with one another; the central part is used for being in transmission connection with a rotor assembly of a motor assembly; the connecting parts and the axial flow fan blades are arranged on the peripheral side of the central part from far to near; the central part and the plurality of axial-flow fan blades are surrounded by the connecting part, one end of each axial-flow fan blade is connected with the central part into a whole, and the other end of each axial-flow fan blade is connected with the inner surface of the connecting part into a whole; and the centrifugal fan blades are formed by extending from the outer surface of the connecting part to the outside of the connecting part. According to the combined fan, the size and the weight of the motor assembly can be indirectly reduced, and the space occupied by the motor assembly is reduced.

Description

Technical Field

[0001] The utility model relates to a combined fan and a motor assembly having the combined fan. Background Art

[0002] In the related art, in addition to the stator assembly and the rotor assembly, some motor assemblies include two types of fans, an axial flow fan and a centrifugal fan; in such designs, the axial flow fan and the centrifugal fan are usually arranged at two opposite ends of the motor assembly, and the axial flow fan is used to inhale wind to cool the motor assembly, and the centrifugal fan is used to discharge the wind that has absorbed heat out of the motor assembly. It is understandable that the arrangement of the axial flow fan and the centrifugal fan being located at different ends of the motor assembly will increase the volume and weight of the motor assembly to a certain extent, and increase the space occupied by the motor assembly. Utility Model Content

[0003] The utility model aims to provide a combined fan and a motor assembly having the same.

[0004] The combined fan provided by the utility model is used to be arranged in the wind cover of the motor assembly, and comprises a connected central part, a connecting part, a plurality of axial flow fan blades and a plurality of centrifugal fan blades; the central part is used to be drivingly connected with the rotor component of the motor assembly; the connecting part and the axial flow fan blades are arranged on the outer peripheral side of the central part from far to near; the connecting part surrounds the central part and the plurality of axial flow fan blades therein, one end of each axial flow fan blade is connected to the central part as a whole, and the other end is connected to the inner surface of the connecting part as a whole; the centrifugal fan blades are formed by extending from the outer surface of the connecting part toward the outside of the connecting part.

[0005] Optionally, the connecting portion is annular; a plurality of axial flow fan blades are arranged at intervals from each other along the circumference of the connecting portion in an inner ring area of ​​the connecting portion; a plurality of centrifugal fan blades are arranged at intervals from each other along the circumference of the connecting portion on an outer surface of the connecting portion; the number of the axial flow fan blades and the number of the centrifugal fan blades are both greater than three and are odd numbers, and the blade twist angles of the axial flow fan blades and the centrifugal fan blades are 15 to 60°.

[0006] The utility model also includes a motor assembly, including a combined fan as described in any of the above items, and also including a stator assembly, a rotor assembly and a wind shield; the combined fan, the stator assembly and the rotor assembly are all located inside the wind shield and are spaced apart from the inner surface of the wind shield.

[0007] Optionally, the wind hood is arranged to penetrate along the up and down directions; the wind hood includes an air inlet port and a main body arranged in sequence from top to bottom, the combined fan is used to suck wind into the wind hood through the air inlet port, the main body and the air inlet port are connected as a whole, and the diameter of the air inlet port increases with the increase of the distance between it and the main body.

[0008] Optionally, the combined fan is located between the stator assembly and the trumpet-shaped air inlet port; the orthographic projection of the air gap between the stator assembly and the rotor assembly on the combined fan is located in the inner ring area of ​​the connecting portion; the orthographic projection of the centrifugal fan blade on the stator assembly is partially located within the encirclement of the outer contour of the stator assembly and partially protrudes out of the outer surface of the stator assembly;

[0009] The axial flow fan blades are used to allow air to flow into the interior of the stator assembly to cool the interior of the stator assembly; the centrifugal fan blades are used to allow air to flow between the outer surface of the stator assembly and the wind shield to cool the outer surface of the stator assembly.

[0010] Optionally, it further comprises a first end cover and a second end cover; the first end cover and the second end cover are sequentially arranged from near to far from the air inlet port; the first end cover and the second end cover are respectively fixedly connected to the upper end of the stator assembly and the lower end of the stator assembly;

[0011] The combined fan is located between the first end cover and the air inlet port; the first end cover and the second end cover are each provided with a plurality of ventilation holes penetrating through the first end cover in the up-down direction; the ventilation holes on the first end cover are used for allowing air to flow into the interior of the stator assembly through the ventilation holes, and the ventilation holes on the second end cover are used for allowing air to flow out of the motor assembly through the ventilation holes.

[0012] Optionally, it also includes a first adapter sleeve and a second adapter sleeve, and the first adapter sleeve and the second adapter sleeve are arranged in sequence from near to far from the air inlet port; the first adapter sleeve and the second adapter sleeve are respectively sleeved on the upper end of the stator assembly and the lower end of the stator assembly; the first end cover and the second end cover are fixedly connected to the first adapter sleeve and the second adapter sleeve respectively.

[0013] Optionally, it also includes a plurality of fixing columns; a protruding hollow convex portion is respectively provided on the first end cover and the second end cover, the hollow convex portion on the first end cover and the hollow convex portion on the second end cover are arranged in a one-to-one correspondence, and the fixing columns and the hollow convex portions on the first end cover are arranged in a one-to-one correspondence; the fixing columns penetrate into the hollow convex portions on the second end cover and the hollow convex portions on the first end cover to form a fixed connection between the first end cover and the second end cover, and are located between the stator assembly and the wind cover.

[0014] Optionally, a matching portion is provided on the inner surface of the body, and the matching portion can be matched with the hollow convex portion on the first end cover and the hollow convex portion on the second end cover in a concave-convex manner.

[0015] Optionally, it also includes a first bearing and a second bearing, and the rotor assembly has parts that pass through the first end cover and the second end cover; the part of the rotor assembly that passes through the first end cover is rotatably connected to the first end cover through a first bearing; the part of the rotor assembly that passes through the second end cover is rotatably connected to the second end cover through a second bearing.

[0016] To sum up, the combined fan provided by the utility model includes both axial flow blades and centrifugal blades. The combined fan provided by the utility model is different from the design of separately setting axial flow fans and centrifugal fans in the related art, and can indirectly reduce the volume and weight of the motor assembly and reduce the space occupied by the motor assembly.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a motor assembly in an embodiment of the utility model.

[0019] Figure 2 It is an exploded view of the motor assembly in the embodiment of the utility model.

[0020] Figure 3 Schematic diagram of a combined fan in an embodiment of the present utility model (only a portion of the rotor assembly is shown in the figure).

[0021] Figure 4 It is a schematic diagram of the partial direction of wind after it flows into the wind shield in the embodiment of the utility model.

[0022] Figure 5 It is a schematic diagram of a combined fan, a stator assembly and a rotor assembly viewed from top to bottom in an embodiment of the utility model.

[0023] Figure 6 It is a comparison diagram before and after the second end cover is connected to the stator assembly in the embodiment of the utility model.

[0024] Figure 7 It is a schematic diagram of the second end cover and the first end cover after being assembled with the fixing member in the embodiment of the utility model.

[0025] Figure 8 It is a schematic diagram of the hollow protrusion of the second end cover and the matching portion in the embodiment of the utility model.

[0026] Fig. 9 It is a schematic diagram of the hollow protrusion of the first end cover and the matching portion after matching in the embodiment of the utility model.

[0027] Fig.10 It is a comparison diagram of the first end cover and the second end cover before and after being assembled with the first bearing and the second bearing in the embodiment of the utility model.

[0028] Description of Reference Numerals

[0029] I - joining edge;

[0030] 1-wind cover, 11-air inlet port, 12-main body, 121-matching part, 2-stator assembly, 3-rotor assembly, 4-combined fan, 41-center part, 42-connecting part, 43-axial flow fan blade, 44-centrifugal fan blade, 5-first end cover, 6-second end cover, 7-first adapter sleeve, 8-second adapter sleeve, 9-ventilation hole, 10-fixing column, 13-hollow convex part, 14-first bearing, 15-second bearing. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0033] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connected" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. In some cases, when expressing that something is fixedly connected to something else, the specific connection method may also include an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] The terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" in the present invention indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] The terms “comprises”, “includes” or any other variations thereof in the present invention are intended to cover a non-exclusive inclusion, which includes not only the listed elements but also other elements not explicitly listed.

[0036] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "exemplarily", "specific example", "further", "optionally", "more detailed description", "preferably", "also provided with", "also including" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0037] It should be noted that in the description of this application, the orientation or position relationship indicated by the term "end" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the term "several" mentioned herein refers to a quantity of at least two.

[0038] like Figure 1 and Figure 2 As shown, this embodiment provides a motor assembly; Figure 2 and Figure 3 As shown, the motor assembly includes a wind cover 1, a stator assembly 2, a rotor assembly 3 and a combined fan 4, wherein the combined fan 4, the stator assembly 2 and the rotor assembly 3 are all located inside the wind cover 1 and are spaced apart from the inner surface of the wind cover 1; the combined fan 4 is used to draw wind into the wind cover 1 to dissipate heat for the stator assembly 2 and the rotor assembly 3.

[0039] Based on the above, the combined fan 4 includes a central portion 41, a connecting portion 42, axial flow blades 43 and centrifugal blades 44 which are all connected as one body; wherein the central portion 41 is used to be fixedly connected to the rotor assembly 3, the connecting portion 42 and a plurality of axial flow blades 43 are arranged on the outer peripheral side of the central portion 41 from far to near, the connecting portion 42 surrounds the central portion 41 and the plurality of axial flow blades 43 therein, one end of each axial flow blade 43 is connected as one body to the central portion 41, and the other end is connected as one body to the inner surface of the connecting portion 42; at the same time, the centrifugal blades 44 are formed by extending from the outer surface of the connecting portion 42 toward the outside of the connecting portion 42.

[0040] Based on the above description, it can be known that the combined fan 4 provided in this embodiment includes both axial flow blades 43 and centrifugal blades 44. Different from the design of separately providing an axial flow fan and a centrifugal fan in the related art, this embodiment integrates the axial flow blades 43 and the centrifugal blades 44 into one design, which can undoubtedly indirectly reduce the volume and weight of the motor assembly and reduce the space occupied by the motor assembly.

[0041] Furthermore, when the combined fan 4 rotates under the drive of the rotor assembly 3, it can be known that the air flowing into the area where the axial flow blades 43 are located will flow out of the combined fan 4 along the axial direction of the combined fan 4, and the air flowing into the area where the centrifugal blades 44 are located will flow out of the combined fan 4 along the radial direction of the combined fan 4 (that is, the air flowing into the area where the centrifugal blades 44 are located will flow out of the combined fan 4 in a direction perpendicular to the aforementioned "air flowing into the area where the axial flow blades 43 are located"). It can be understood that when the combined fan 4 is applied to the wind hood 1, two winds with mutually perpendicular flow directions will be generated in the wind hood 1.

[0042] Based on the above two perpendicular winds, Figure 4 and Figure 5 As shown, those skilled in the art can reasonably set the position of the axial flow fan blades 43 in the motor assembly so that the wind flowing out of the axial flow fan blades 43 mainly flows into the interior of the stator assembly 2, and then the combined fan 4 can efficiently take away the heat generated inside the stator assembly 2; at the same time, naturally, the wind generated by the centrifugal fan blades 44 will hit the wind cover 1 due to the obstruction of the wind cover 1, and then flow along the outline of the wind cover 1, and then at least part of the wind will flow between the wind cover 1 and the stator assembly 2 to take away the heat on the outer surface of the stator assembly 2. In this way, based on the ability to cool the inside and outside of the stator assembly 2 at the same time, the combined fan 4 of this embodiment can ensure the cooling efficiency of the stator assembly 2 and the rotor assembly 3 while ensuring that the volume and weight of the motor assembly are relatively small, and ensure uniform heat dissipation inside the motor assembly.

[0043] Please refer to Figure 4 , Figure 5 and Figure 6 It should be noted that, in the aforementioned “let the wind flowing out of the axial flow fan blades 43 mainly flow into the interior of the stator assembly 2, so that the combined fan 4 can efficiently take away the heat generated inside the stator assembly 2”, the description of “the interior of the stator assembly 2” actually means that the wind flowing out of the axial flow fan blades 43 will cool the parts in the stator assembly 2 and subordinate to the stator assembly 2 (such as the stator winding, the non-outer surface of the stator core and other main heat-generating parts of the motor assembly), as well as the rotor assembly 3 passing through the stator assembly 2, thereby taking away the heat of the parts in the stator assembly 2 and subordinate to the stator assembly 2, as well as the rotor assembly 3 passing through the stator assembly 2.

[0044] For the above motor assembly, the following is a more detailed exemplary configuration:

[0045] Please continue reading Figure 3 The combined fan 4 is illustratively used to suck wind into the wind cover 1 from top to bottom, the aforementioned connecting portion 42 is illustratively annular, and the aforementioned center portion 41 is illustratively a hollow cylindrical shape; at the same time, the upper end of the rotor assembly 3 penetrates into the hollow part of the center portion 41 and is fixedly connected to the center portion 41, so that the rotor assembly 3 and the center portion 41 form a transmission connection, thereby driving the combined fan 4 to rotate.

[0046] Based on the above, the number of the aforementioned axial flow fan blades 43 and the centrifugal fan blades 44 are exemplarily nine; the nine axial flow fan blades 43 are arranged in the inner ring area of ​​the connecting portion 42 at intervals along the circumference of the connecting portion 42, and the nine centrifugal fan blades 44 are arranged on the outer surface of the connecting portion 42 at intervals along the circumference of the connecting portion 42. It should be noted that although the number of axial flow fan blades 43 and centrifugal fan blades 44 in the combined fan 4 is described as "several", that is, at least two, based on the fact that most motors need to have a certain cooling efficiency, it is preferred that the number of axial flow fan blades 43 and the number of the centrifugal fan blades 44 are both more than three. In addition, the blade twist angles of the axial flow fan blades 43 and the centrifugal fan blades 44 are preferably between 15 and 60°. More preferably, the number of axial flow fan blades 43 and the number of centrifugal fan blades 44 are both odd numbers.

[0047] Please continue reading Figure 4 and Figure 5 , illustratively, the hood 1 is arranged through in the up-down direction, and the hood 1 specifically includes an air inlet port 11 and a columnar body 12 whose axial direction is in the up-down direction; in this embodiment, the body 12 and the air inlet port 11 are connected as a whole, and the air inlet port 11 is trumpet-shaped, and the diameter of the air inlet port 11 increases with the increase of the distance between the air inlet port 11 and the body 12; the diameter of the aforementioned connecting portion 42 is substantially equal to the minimum diameter of the air inlet port 11, and the axial flow fan blades 43 can be substantially completely exposed at the air inlet port 11. In this embodiment, after being sucked into the hood 1 by the combined fan 4 through the air inlet port 11, the air will go down and absorb the heat of the stator assembly 2 and the rotor assembly 3, and then be discharged from the motor assembly through the lower end of the hood 1.

[0048] It is understandable that the trumpet-shaped design of the air inlet port 11 can increase the speed of the wind flowing into the wind cover 1, thereby indirectly ensuring the cooling efficiency of the motor assembly. In addition, in a possible implementation, based on the design that the air inlet port 11 is trumpet-shaped and the wind flow rate at the air inlet port 11 is relatively high, if the cooling efficiency allows, other equipment that is expected to be cooled can be set on the upper side of the air inlet port 11, and the wind sucked into the air inlet port 11 is an air flow that has absorbed the heat of other equipment; at this time, the motor assembly is used as an auxiliary heat dissipation device in addition to being a tool for external work.

[0049] Please continue reading Figure 4 and Figure 5 The motor assembly of this embodiment also includes an exemplary configuration as follows: the combined fan 4 is located between the air inlet port 11 and the stator assembly 2, and the orthographic projection of the air gap between the stator assembly 2 and the rotor assembly 3 on the combined fan 4 is configured to be located in the inner ring area of ​​the connecting portion 42; the orthographic projection of the centrifugal fan blades 44 on the stator assembly 2 is partially surrounded by the outer surface of the stator assembly 2, and partially protrudes from the outer surface of the stator assembly 2.

[0050] Please continue reading Figure 4 In this embodiment, based on the axial fan blades 43, a portion of the air flowing into the main body 12 through the air inlet port 11 will flow into the interior of the stator assembly 2 as shown by the solid arrow to cool the interior of the stator assembly 2; based on the centrifugal fan blades 44, a portion of the air flowing into the main body 12 through the air inlet port 11 will flow from top to bottom along the inner surface of the main body 12 between the outer surface of the stator assembly 2 and the wind cover 1 as shown by the dotted arrow.

[0051] Please refer back to Figure 2 The motor assembly of this embodiment further includes a first end cover 5, a second end cover 6, a first adapter sleeve 7 and a second adapter sleeve 8; wherein the first end cover 5 is an arched body with an opening facing downward, the second end cover 6 is a special-shaped part, and the first adapter sleeve 7 and the second adapter sleeve 8 are both annular objects sleeved on the outer surface of the stator assembly 2; the first adapter sleeve 7 and the second adapter sleeve 8 are arranged in sequence from top to bottom, and the first end cover 5 and the second end cover 6 are also arranged in sequence from top to bottom, and are respectively fixedly connected to the first end cover 5 and the second end cover 6, so that the first end cover 5 and the second end cover 6 are respectively fixed on the upper and lower ends of the stator assembly 2.

[0052] It can be understood that, in a possible implementation, the first adapter sleeve 7 can be regarded as a part of the first end cover 5, and the second adapter sleeve 8 can be regarded as a part of the second end cover 6. At this time, the relationship between the first end cover 5, the second end cover 6 and the stator assembly 2 is: the first end cover 5 and the second end cover 6 are directly fixedly connected to the upper and lower ends of the stator assembly 2, respectively.

[0053] According to the above, the aforementioned combined fan 4 is located between the first end cover 5 and the air inlet port 11, and Figure 4 and Figure 6As shown, the first end cover 5 and the second end cover 6 are each provided with a plurality of ventilation holes 9 penetrating the first end cover 5 and the second end cover 6, and the ventilation holes 9 on the first end cover 5 are used for allowing air to flow into the interior of the stator assembly 2, and the ventilation holes 9 on the second end cover 6 are used for allowing air to flow out of the motor assembly. It can be understood that when the air with the outside temperature flows into the first end cover 5 but has not yet flowed out of the second end cover 6, the air fills the interior of the stator assembly 2, and absorbs the heat energy of the parts (subordinate to the stator assembly 2) inside the stator assembly 2 and the heat energy of the rotor assembly 3 inside the stator assembly 2 during the process of flowing from top to bottom, thereby cooling the interior of the stator assembly 2, and coordinating with the air flowing through the outer surface of the stator assembly 2 to ensure that the stator assembly 2 and the rotor assembly 3 are evenly cooled.

[0054] For example, to ensure the stable connection between the first end cover 5, the second end cover 6 and the stator assembly 2, and the stable arrangement of the first end cover 5 and the second end cover 6 in the motor assembly, as shown in FIG. Figure 7 As shown, the motor assembly also includes a plurality of fixing members 10, and a protruding hollow convex portion 13 is respectively provided on the first end cover 5 and the second end cover 6, and the hollow convex portion 13 on the first end cover 5 and the hollow convex portion 13 on the second end cover 6 are arranged in a one-to-one correspondence; after the first end cover 5 and the second end cover 6 are respectively connected to the stator assembly 2, the fixing member 10 is inserted into the hollow convex portion 13 on the second end cover 6 and the hollow convex portion 13 on the first end cover 5, and the fixing member 10 is located between the stator assembly 2 and the wind cover 1, and becomes another fixed connection between the first end cover 5 and the second end cover 6; at this time, the first end cover 5, the second end cover 6 and the fixing member 10 form a cage-like structure on the outer peripheral side of the stator assembly 2, and it can be understood that the structure has considerable stability.

[0055] Please continue reading Figure 8 and Fig. 9 In order to further ensure the stable connection between the first end cover 5 and the second end cover 6 and the stator assembly 2, as well as the stable arrangement of the first end cover 5 and the second end cover 6 themselves in the motor assembly, illustratively, a mating portion 121 is formed by convexly extending inward from the inner surface of the main body 12, and a pit is provided in the middle of the mating portion 121, which can be mated with the hollow convex portion 13 on the first end cover 5 and the second end cover 6; when the first end cover 5, the second end cover 6, the air cover 1 and the stator assembly 2 are assembled, based on the convex-concave fit between the hollow convex portion 13 and the mating portion 121, the first end cover 5 and the second end cover 6 are limited and supported, so that they are reliably and stably arranged in the motor assembly.

[0056] Please read further Fig.10, exemplarily, the motor assembly further includes a first bearing 14 and a second bearing 15, and the rotor assembly 3 has a portion inserted into the first end cover 5 and the second end cover 6; specifically, the portion of the rotor assembly 3 inserted into the first end cover 5 is rotatably connected to the first end cover 5 through the first bearing 14, and the portion of the rotor assembly 3 inserted into the second end cover 6 is rotatably connected to the second end cover 6 through the second bearing 15. It can be understood that this design enables the rotor assembly 3 to be mounted in the motor assembly and enables the rotor assembly 3 to rotate relative to the stator assembly 2.

[0057] Please refer back to Figure 2 To facilitate the assembly of the motor assembly, the fan cover 1 of this embodiment includes two split parts with basically the same structure, and fixing parts such as bolts pass through the two split parts, and the two split parts are fixedly combined to obtain the fan cover 1. Figure 2 As shown, after the two parts are assembled, a joint edge I will be formed on the wind shield 1. In this embodiment, the joint edge I is equivalent to dividing the wind shield 1 into two. Figure 8 For clarity, Figure 8 One of these two parts is shown in FIG.

[0058] To sum up, the combined fan 4 provided by the utility model includes both axial flow blades 43 and centrifugal blades 44. The combined fan 4 provided by the utility model is different from the design of separately setting axial flow fans and centrifugal fans in the related art, and can indirectly reduce the volume and weight of the motor assembly and reduce the space occupied by the motor assembly.

[0059] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A combined fan, characterized in that: The invention is used to be arranged in a fan housing (1) of a motor assembly, and comprises a connected central portion (41), a connecting portion (42), a plurality of axial flow fan blades (43) and a plurality of centrifugal fan blades (44); the central portion (41) is used for transmission connection with a rotor assembly (3) of the motor assembly; the connecting portion (42) and the axial flow fan blades (43) are arranged on the outer peripheral side of the central portion (41) from far to near; the connecting portion (42) surrounds the central portion (41) and the plurality of axial flow fan blades (43) therein, one end of each axial flow fan blade (43) is connected to the central portion (41) as a whole, and the other end is connected to the inner surface of the connecting portion (42) as a whole; the centrifugal fan blades (44) are formed by extending from the outer surface of the connecting portion (42) toward the outside of the connecting portion (42).

2. The combined fan according to claim 1, characterized in that: The connecting portion (42) is annular; a plurality of axial flow fan blades (43) are arranged at intervals from each other in the inner ring area of ​​the connecting portion (42) along the circumference of the connecting portion (42); a plurality of centrifugal fan blades (44) are arranged at intervals from each other on the outer surface of the connecting portion (42) along the circumference of the connecting portion (42); the number of the axial flow fan blades (43) and the number of the centrifugal fan blades (44) are both greater than three and are odd numbers, and the blade twist angles of the axial flow fan blades (43) and the centrifugal fan blades (44) are 15 to 60 degrees.

3. A motor assembly, characterized in that: It comprises the combined fan (4) as claimed in claim 1 or 2, and also comprises a stator assembly (2), a rotor assembly (3) and a wind shield (1); the combined fan (4), the stator assembly (2) and the rotor assembly (3) are all located inside the wind shield (1), and are all spaced apart from the inner surface of the wind shield (1).

4. The motor assembly according to claim 3, characterized in that: The wind hood (1) is arranged to be continuous in the up-down direction; the wind hood (1) comprises an air inlet port (11) and a body (12) arranged in sequence from top to bottom; the combined fan (4) is used to suck air into the wind hood (1) through the air inlet port (11); the body (12) and the air inlet port (11) are connected as a whole, and the diameter of the air inlet port (11) increases as the distance between the air inlet port (11) and the body (12) increases.

5. The motor assembly according to claim 4, characterized in that: The combined fan (4) is located between the stator assembly (2) and the trumpet-shaped air inlet port (11); the orthographic projection of the air gap between the stator assembly (2) and the rotor assembly (3) on the combined fan (4) is located in the inner ring area of ​​the connecting portion (42); the orthographic projection of the centrifugal fan blade (44) on the stator assembly (2) is partially located within the outer contour of the stator assembly (2) and partially protrudes from the outer surface of the stator assembly (2); The axial flow fan blades (43) are used to allow air to flow into the interior of the stator assembly (2) to cool the interior of the stator assembly (2); and the centrifugal fan blades (44) are used to allow air to flow between the outer surface of the stator assembly (2) and the wind cover (1) to cool the outer surface of the stator assembly (2).

6. The motor assembly according to claim 4, characterized in that: It also comprises a first end cover (5) and a second end cover (6); the first end cover (5) and the second end cover (6) are arranged in order from near to far from the air inlet port (11); the first end cover (5) and the second end cover (6) are fixedly connected to the upper end of the stator assembly (2) and the lower end of the stator assembly (2), respectively; The combined fan (4) is located between the first end cover (5) and the air inlet port (11); the first end cover (5) and the second end cover (6) are each provided with a plurality of ventilation holes (9) penetrating the first end cover (5) and the second end cover (6) in an up-down direction; the ventilation holes (9) on the first end cover (5) are used for allowing air to flow into the interior of the stator assembly (2) through the ventilation holes (9), and the ventilation holes (9) on the second end cover (6) are used for allowing air to flow out of the motor assembly through the ventilation holes (9).

7. The motor assembly according to claim 6, characterized in that: The invention also comprises a first adapter sleeve (7) and a second adapter sleeve (8), wherein the first adapter sleeve (7) and the second adapter sleeve (8) are arranged in sequence from near to far from the air inlet port (11); the first adapter sleeve (7) and the second adapter sleeve (8) are respectively sleeved on the upper end of the stator assembly (2) and the lower end of the stator assembly (2); and the first end cover (5) and the second end cover (6) are respectively fixedly connected to the first adapter sleeve (7) and the second adapter sleeve (8).

8. The motor assembly according to claim 6, characterized in that: The invention also comprises a plurality of fixing columns (10); a protruding hollow convex portion (13) is respectively provided on the first end cover (5) and the second end cover (6); the hollow convex portion (13) on the first end cover (5) and the hollow convex portion (13) on the second end cover (6) are arranged one-to-one, and the fixing columns (10) and the hollow convex portion (13) on the first end cover (5) are arranged one-to-one; the fixing columns (10) penetrate the hollow convex portion (13) on the second end cover (6) and the hollow convex portion (13) on the first end cover (5) to form a fixed connection between the first end cover (5) and the second end cover (6), and are located between the stator assembly (2) and the wind cover (1).

9. The motor assembly according to claim 8, characterized in that: A matching portion (121) is provided on the inner surface of the body (12), and the matching portion (121) can be matched with the hollow convex portion (13) on the first end cover (5) and the hollow convex portion (13) on the second end cover (6).

10. The motor assembly according to claim 4, characterized in that: The invention also comprises a first bearing (14) and a second bearing (15), wherein the rotor assembly (3) has parts which are inserted into the first end cover (5) and the second end cover (6); the part of the rotor assembly (3) which is inserted into the first end cover (5) is rotatably connected to the first end cover (5) via the first bearing (14); and the part of the rotor assembly (3) which is inserted into the second end cover (6) is rotatably connected to the second end cover (6) via the second bearing (15).

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