Outer rotor fan rotor assembly

Abstract

The utility model discloses a rotor assembly of an outer rotor fan. The rotor assembly comprises a rotor assembly, the magnetic ring is arranged in the rotor assembly; the impeller upper plate insert is connected to the rotor assembly; the impeller lower plate is in insert connection with the impeller upper plate; the rotor assembly comprises a casing connected with the impeller upper plate insert; one end of the shaft is arranged in the shell, and the shaft and the shell are arranged at intervals; the shaft sleeve insert is connected with the shell and the shaft through an insert injection molding process; therefore, the technical problems that the assembly precision is relatively poor and the structural strength is relatively low are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilators, and specifically relates to a rotor assembly of an external rotor fan. Background Art

[0002] A ventilator is a device that can replace, control, or change a person's normal physiological respiration, increase pulmonary ventilation volume, improve respiratory function, and reduce the consumption of respiratory work;

[0003] Among them, the external rotor fan is a core component on the ventilator, and the rotor assembly is a core component on the fan. For the rotor assembly on the traditional external rotor fan, due to the relatively large diameter of the impeller, generally 90 mm in diameter, and the rotational speed of 7000 r / min, the inertia is relatively large. High strength requirements are imposed on the connection between the impeller and the housing of the rotor assembly, and the connection between the shaft on the rotor assembly and the housing (the shaft is connected to the housing through a bushing). The connection is usually assembled by crimping or bonding processes, and the concentricity, perpendicularity, etc. are relatively poor, making it difficult to ensure the connection accuracy, and secondary correction is required, which affects the structural strength. Summary of the Utility Model

[0004] Aiming at the above-mentioned deficiencies in the related technologies, the purpose is to provide a rotor assembly of an external rotor fan to solve the technical problems of relatively poor assembly accuracy and relatively low structural strength in the related technologies.

[0005] The technical solution to achieve the purpose is: A rotor assembly of an external rotor fan, comprising:

[0006] A rotor assembly;

[0007] A magnetic ring, arranged inside the rotor assembly;

[0008] An impeller upper plate insert, connected to the rotor assembly;

[0009] And an impeller lower plate, connected to the impeller upper plate insert;

[0010] The rotor assembly includes: a housing, connected to the impeller upper plate insert; a shaft, one end of which is arranged inside the housing and is spaced from the housing; and a bushing insert, connecting the housing and the shaft by means of insert injection molding process.

[0011] Further: The housing includes: an annular side wall, having a plurality of first through holes on the annular side wall, and an inner space is further provided inside the annular side wall, and the first through holes communicate with the inner space;

[0012] An annular side plate, arranged at one end of the annular side wall, the outer circle of which is connected to the annular side wall, and together with the annular side wall, connects the impeller upper plate insert;

[0013] and an inner plate, connected to the inner circle of the circular side plate, extending into the inner space, offset from the circular side plate to form a step. The inner plate has a second through hole and a plurality of third through holes. The third through holes are arranged at intervals with respect to the second through hole and surround the second through hole. The inner plate is connected to the bushing insert at this position.

[0014] Furthermore: The second through hole is arranged at the middle position of the inner plate and there is one in number;

[0015] The number of the third through holes is six, evenly distributed on the inner plate along the circumferential direction and surrounding the second through hole.

[0016] Furthermore: The shaft is a section of circular shaft, and at least two grooves are provided at one end. The bushing insert is embedded at the grooves and connected to the bushing insert.

[0017] Furthermore: The bushing insert includes: an outer stop, one side wall of which is attached to one side wall of the inner plate and is arranged outside the inner space;

[0018] a first filling portion, one end of which is connected to the outer stop, the other end passes through the second through hole, is arranged in the inner space and is connected to the shaft;

[0019] a plurality of second filling portions, arranged in one-to-one correspondence with the third through holes and filling the third through holes;

[0020] and an inner stop, connected to the first filling portion and the second filling portion, arranged in the inner space, attached to the other side wall of the inner plate, and together with the outer stop, clamping the inner plate.

[0021] Furthermore: The outer diameter dimension of the outer stop is larger than the outer diameter dimension of the inner stop, and the other side wall of the outer stop is flush with the side wall of the circular side plate.

[0022] Furthermore: One end of the first filling portion is connected to the outer stop, the middle position fills the second through hole, the other end has a conical surface, and the first filling portion also has an inner hole. There are at least two protrusions in the inner hole. One end of the shaft is connected to the inner hole, and the protrusions are embedded in the grooves.

[0023] Furthermore: The magnetic ring is connected to the circular side wall, arranged in the inner space, and one end face A of the magnetic ring is flush with the other end face B of the circular side wall. The magnetic ring is spaced from the circular side plate, the shaft and the bushing insert.

[0024] Furthermore: The middle position of the upper impeller plate insert is connected to one end of the casing, surrounds the rotor assembly, and forms an integral body with the casing through an insert injection molding process. The edge position of the upper impeller plate insert extends away from the rotor assembly.

[0025] Furthermore: The upper impeller plate insert includes: a middle outer wrapper, which is wrapped on the outer walls of the circular side wall and the circular side plate;

[0026] a first disk body, which is connected to one end of the middle outer wrapper and surrounds the middle outer wrapper. The thickness dimension of the first disk body is smaller than the thickness dimension of the middle outer wrapper. A stepped space is formed between the first disk body and the middle outer wrapper, and a number of fourth through holes are arranged at intervals on the first disk body;

[0027] and a number of third filling parts, which are arranged at intervals in the middle outer wrapper, are arranged one-to-one with the first through holes, and fill the first through holes.

[0028] Furthermore: The lower impeller plate includes: a second disk body, which is arranged at the stepped space, surrounds the middle outer wrapper at the middle part, is arranged at an interval from the middle outer wrapper, and the outer edge is flush with the outer circle of the first disk body;

[0029] a number of blades, which are evenly distributed on the second disk body and are arranged between the second disk body and the first disk body;

[0030] and a number of fourth filling parts. Two fourth filling parts are provided on one blade, and one fourth filling part fills one fourth through hole.

[0031] Adopting the above technical solution, the following beneficial effects are obtained: An outer rotor fan rotor assembly, compared with the related technology, is provided with a rotor assembly, a magnetic ring, an upper impeller plate insert and a lower impeller plate; The rotor assembly includes: a casing, a shaft, and a shaft sleeve insert;

[0032] Between the casing and the shaft, through the shaft sleeve insert, in the way of insert injection molding process, they are connected as an integral body. Compared with: adopting the processes of crimping or bonding, the assembly accuracy is relatively high, no secondary correction is required, the efficiency is improved, and the structural strength is improved;

[0033] And, the magnetic ring is arranged in the rotor assembly, the upper impeller plate insert is connected to the rotor assembly, and the lower impeller plate is connected to the upper impeller plate insert, realizing relatively convenient assembly and ensuring the structural strength;

[0034] Thus, the technical problems of relatively poor assembly accuracy and relatively low structural strength are overcome, the technical effect of relatively high assembly accuracy and improved structural strength is achieved, and it has practicability. Brief Description of the Drawings

[0035] Figure 1 is the overall assembly explosion diagram;

[0036] Figure 2 is Figure 1 the partial cross-sectional view after assembly;

[0037] Figure 3 is the partial cross-sectional view of the rotor assembly;

[0038] Figure 4 is the structural schematic diagram of the housing;

[0039] Figure 5 is the partial cross-sectional view of the housing;

[0040] Figure 6 is the structural schematic diagram of the shaft;

[0041] Figure 7 is the structural schematic diagram of the bushing insert;

[0042] Figure 8 is the partial cross-sectional view of the bushing insert;

[0043] Figure 9 is the structural schematic diagram of the magnetic ring;

[0044] Figure 10 is the structural schematic diagram of the upper plate insert of the impeller;

[0045] Figure 11 is the structural schematic diagram of the lower plate of the impeller;

[0046] In the figure: 10. Rotor assembly, 11. Housing, 11-1. Circular side wall, 11-11. First through hole, 11-12. Inner space, 11-2. Circular side plate, 11-3. Inner side plate, 11-31. Second through hole, 11-32. Third through hole, 12. Shaft, 12-1. Groove, 13. Bushing insert, 13-1. Outer stop, 13-2. First filling part, 13-21. Tapered surface, 13-22. Inner hole, 13-22-1. Protrusion, 13-3. Second filling part, 13-4. Inner stop, 20. Magnetic ring, 30. Upper plate insert of the impeller, 31. Intermediate outer package, 32. First disk body, 32-1. Step space, 32-2. Fourth through hole, 33. Third filling part, 40. Lower plate of the impeller, 41. Second disk body, 42. Blade, 43. Fourth filling part. Detailed Description of the Preferred Embodiments

[0047] In order to make the content easier to be clearly understood, the following further detailed description is made according to specific embodiments in conjunction with the accompanying drawings;

[0048] An external rotor fan rotor assembly solves the technical problems of relatively poor assembly accuracy and relatively low structural strength in the related art, can be manufactured and used, and achieves the positive effects of relatively high assembly accuracy and improved structural strength. The general idea is as follows:

[0049] One embodiment:

[0050] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 shown; an external rotor fan rotor assembly includes:

[0051] A rotor assembly 10;

[0052] A magnetic ring 20, disposed within the rotor assembly 10;

[0053] An impeller upper plate insert 30, connected to the rotor assembly 10;

[0054] And an impeller lower plate 40, connected to the impeller upper plate insert 30;

[0055] The rotor assembly 10 includes: a housing 11, connected to the impeller upper plate insert 30; a shaft 12, one end of which is disposed within the housing 11 and spaced apart from the housing 11; and a bushing insert 13, connecting the housing 11 and the shaft 12 by means of an insert injection molding process;

[0056] Specifically, during implementation, a rotor assembly 10, a magnetic ring 20, an impeller upper plate insert 30, and an impeller lower plate 40 are provided; the rotor assembly 10 includes: a housing 11, a shaft 12, and a bushing insert 13;

[0057] Between the housing 11 and the shaft 12, through the bushing insert 13, by means of an insert injection molding process, they are connected as a whole. Compared with: using a crimping or bonding process, the assembly accuracy is relatively high, no secondary correction is required, the efficiency is improved, and the structural strength is improved;

[0058] And, the magnetic ring 20 is disposed within the rotor assembly 10, the impeller upper plate insert 30 is connected to the rotor assembly 10, and the impeller lower plate 40 is connected to the impeller upper plate insert 30, achieving relatively convenient assembly and ensuring the structural strength;

[0059] Another embodiment:

[0060] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown in Figure 8 ; during implementation, the housing 11 includes: an annular side wall 11-1, on which there are a number of first through holes 11-11, and there is also an inner space 11-12 inside the annular side wall 11-1, and the first through holes 11-11 communicate with the inner space 11-12; an annular side plate 11-2, arranged at one end of the annular side wall 11-1, with its outer circle connected to the annular side wall 11-1, and together with the annular side wall 11-1, connecting the impeller upper plate insert 30; and an inner side plate 11-3, connected to the inner circle of the annular side plate 11-2, extending towards the inner space 11-12, offset from the annular side plate 11-2 to form a step, and the inner side plate 11-3 has a second through hole 11-31 and a number of third through holes 11-32, the third through holes 11-32 are arranged at intervals with respect to the second through hole 11-31, and around the second through hole 11-31, the inner side plate 11-3 is connected to the bushing insert 13;

[0061] The annular side wall 11-1, the annular side plate 11-2 and the inner side plate 11-3 are integrally formed, with a regular shape, which is relatively convenient for processing and manufacturing. The formed inner space 11-12 is conducive to connecting and positioning the magnetic ring 20;

[0062] There are first through holes 11-11 provided, and the first through holes 11-11 are square through holes. The third filling part 33 on the impeller upper plate insert 30 is embedded in the first through holes 11-11, which is conducive to connecting the impeller upper plate insert 30 and the rotor assembly 10 into a relatively integral whole through the insert injection molding process. Compared with the processes of crimping or bonding, the assembly accuracy is relatively high, and no secondary correction is required, improving the efficiency;

[0063] There are second through holes 11-31 and third through holes 11-32 provided, and the second through holes 11-31 and the third through holes 11-32 are round holes; the second through hole 11-31 is arranged at the middle position of the inner side plate 11-3, and the number is one; the number of the third through holes 11-32 is six, evenly distributed along the circumferential direction on the inner side plate 11-3, surrounding the second through hole 11-31; which is conducive to connecting the bushing insert 13 and the inner side plate 11-3 into a relatively integral whole through the insert injection molding process, with relatively high assembly accuracy, no secondary correction is required, and the efficiency is improved;

[0064] Insert molding process refers to a molding method in which a mold is used to inject molten materials (such as resin, plastic, metal, etc.) into the installed components (the components are the housing 11 and the shaft 12). In the mold, the molten materials are joined with the components to form an integral whole. After the molten materials are cooled, they form a bushing insert 13, so that the housing 11, the shaft 12, and the bushing insert 13 are connected as a relative whole, with relatively high assembly accuracy, no need for secondary correction, improved efficiency, and ensured structural strength;

[0065] The shaft 12 is a section of round shaft, and at least two grooves 12-1 are provided at one end. The grooves 12-1 are embedded by the bushing insert 13 and connected to the bushing insert 13. The provision of the grooves 12-1 is conducive to the embedding of the molten materials, making the connection reliability between the shaft 12 and the bushing insert 13 relatively good;

[0066] The bushing insert 13 includes: an outer stop 13-1, one side wall of which is attached to one side wall of the inner side plate 11-3 and is arranged outside the inner space 11-12; a first filling portion 13-2, one end of which is connected to the outer stop 13-1 and the other end passes through the second through hole 11-31 and is arranged in the inner space 11-12 to connect the shaft 12; a plurality of second filling portions 13-3, which are arranged one-to-one with the third through hole 11-32 and fill the third through hole 11-32; and an inner stop 13-4, which is connected to the first filling portion 13-2 and the second filling portion 13-3 and is arranged in the inner space 11-12, is attached to the other side wall of the inner side plate 11-3, and together with the outer stop 13-1, clamps the inner side plate 11-3;

[0067] The outer diameter dimension of the outer stop 13-1 is larger than the outer diameter dimension of the inner stop 13-4, and the other side wall of the outer stop 13-1 is flush with the side wall of the circular side plate 11-2, which is relatively beautiful and is conducive to the outer stop 13-1 and the inner stop 13-4 together clamping the inner side plate 11-3, and the connection reliability is relatively good;

[0068] One end of the first filling portion 13-2 is connected to the outer stop 13-1, the middle position fills the second through hole 11-31, the other end has a tapered surface 13-21, and the first filling portion 13-2 also has an inner hole 13-22. At least two protrusions 13-22-1 are provided in the inner hole 13-22. One end of the shaft 12 is connected to the inner hole 13-22, and the protrusions 13-22-1 are embedded in the grooves 12-1, and the connection reliability is relatively good;

[0069] The second filling portion 13-3 fills the third through hole 11-32, and the connection reliability is relatively good;

[0070] Another embodiment:

[0071] As shown in Figure 1 , Figure 2 , Figure 9 ; During implementation, the magnetic ring 20 is connected to the circular side wall 11-1, disposed within the inner space 11-12, and one end face A of the magnetic ring 20 is flush with the other end face B of the circular side wall 11-1. The magnetic ring 20 is spaced apart from the circular side plate 11-2, the shaft 12, and the bushing insert 13;

[0072] The outer shape of the magnetic ring 20 is a circular ring structure. Glue is applied at the inner wall of the circular side wall 11-1. The magnetic ring 20 and the circular side wall 11-1 are in clearance fit and bonded together, making the assembly relatively convenient;

[0073] One end face A of the magnetic ring 20 is flush with the other end face B of the circular side wall 11-1, which is relatively aesthetically pleasing and is conducive to determining the position of the magnetic ring 20;

[0074] Another implementation method:

[0075] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 10 , Figure 11 ; During implementation, the impeller upper plate insert 30 includes: an intermediate outer wrapper 31, which wraps around the outer walls of the circular side wall 11-1 and the circular side plate 11-2; a first disk body 32, connected to one end of the intermediate outer wrapper 31, surrounding the intermediate outer wrapper 31, the thickness dimension of the first disk body 32 being smaller than the thickness dimension of the intermediate outer wrapper 31, a stepped space 32-1 being formed between the first disk body 32 and the intermediate outer wrapper 31, and a number of fourth through holes 32-2 being spaced apart on the first disk body 32; and a number of third filling parts 33, spaced apart within the intermediate outer wrapper 31, arranged one-to-one with the first through holes 11-11 to fill the first through holes 11-11;

[0076] The material of the impeller upper plate insert 30 is plastic. It forms an integral body with the rotor assembly 10 through the insert injection molding process. The intermediate outer wrapper 31 wraps around the outer walls of the circular side wall 11-1 and the circular side plate 11-2. The third filling parts 33 fill the first through holes 11-11, making the connection between the impeller upper plate insert 30 and the rotor assembly 10 tight, with relatively high assembly accuracy, no need for secondary calibration, improving the efficiency and the structural strength;

[0077] At the first disk body 32, it is conducive to connecting the impeller lower plate 40, with a relatively aesthetically pleasing appearance and relatively good structural reliability;

[0078] The upper plate insert 30 of the impeller and the rotor assembly 10 are integrally formed by insert injection molding process. The insert injection molding process means that a mold is used to inject molten material (such as resin, plastic, metal, etc.) for the loaded component (the component is the rotor assembly 10). In the mold, the molten material is joined with the component to form an integral molding method, which further improves the assembly accuracy and structural strength.

[0079] Another embodiment:

[0080] As Figure 1 、 Figure 2 、 Figure 10 、 Figure 11 shown; In implementation, the lower plate 40 of the impeller includes: a second disc body 41, disposed at the step space 32-1, surrounding the middle outer package 31 at the middle part, spaced from the middle outer package 31, and having an outer edge flush with the outer circle of the first disc body 32; seven blades 42, evenly distributed on the second disc body 41, disposed between the second disc body 41 and the first disc body 32; and fourteen fourth filling parts 43, each blade 42 having two of the fourth filling parts 43, and one of the fourth filling parts 43 filling one of the fourth through holes 32-2.

[0081] The material of the lower plate 40 of the impeller is plastic; the second disc body 41, the blades 42 and the fourth filling parts 43 are integrally injection molded; by inserting and welding through the fourth filling parts 43 at the fourth through holes 32-2, the assembly of the lower plate 40 of the impeller and the upper plate insert 30 of the impeller is relatively convenient, and the structural reliability is relatively good.

[0082] The working principle is as follows: The machine housing 11, the shaft 12 and the shaft sleeve insert 13 are connected as a relative whole by insert injection molding process to form the rotor assembly 10.

[0083] The magnetic ring 20 is disposed inside the rotor assembly 10.

[0084] The upper plate insert 30 of the impeller and the rotor assembly 10 are integrally formed by insert injection molding process.

[0085] The lower plate 40 of the impeller and the upper plate insert 30 of the impeller are welded; the assembly is relatively convenient, the assembly accuracy is relatively high, and the structural strength is ensured.

[0086] In the description, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc. indicating orientation or positional relationship are based on the positional relationship described in the accompanying drawings, and are only for the convenience of description or simplification of the description, rather than indicating a specific orientation that must be had; the operation process described in the embodiments is not an absolute usage step, and corresponding adjustments can be made during actual use;

[0087] Unless otherwise defined individually, the technical terms or scientific terms used herein shall have the ordinary meaning understood by those of ordinary skill in the art; the terms "first", "second" and similar words used in the specification and claims do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "one" do not necessarily denote a quantity limitation, but indicate the existence of at least one, and it is necessary to determine according to the content of the embodiments;

[0088] As described above, it is only a preferred specific implementation manner, but the scope of protection is not limited thereto. Any person skilled in the art within the disclosed technical scope, according to the technical solutions and inventive concepts thereof, makes equivalent substitutions or changes, and should be covered within the scope of protection.

Claims

1. An outer rotor fan rotor assembly, characterized in that, include: A rotor assembly (10); A magnetic ring (20) is arranged in the rotor assembly (10); An impeller upper plate insert (30) connected to the rotor assembly (10); and an impeller lower plate (40) connected to the impeller upper plate insert (30); The rotor assembly (10) comprises: a casing (11) connected to the impeller upper plate insert (30); A shaft (12) having one end disposed in the housing (11) and spaced apart from the housing (11); and a shaft sleeve insert (13) connecting the housing (11) and the shaft (12) by means of an insert injection molding process.

2. The outer rotor fan rotor assembly according to claim 1, characterized in that: The housing (11) comprises: an annular side wall (11-1), the annular side wall (11-1) having a plurality of first through holes (11-11), the annular side wall (11-1) also having an inner space (11-12), the first through holes (11-11) being in communication with the inner space (11-12); A circular ring-shaped side plate (11-2) is arranged on one end of the circular ring-shaped side wall (11-1), is connected to the circular ring-shaped side wall (11-1) at its outer circumference, and is connected to the impeller upper plate insert (30) together with the circular ring-shaped side wall (11-1); and an inner plate (11-3), connected to the inner circle of the annular side plate (11-2), extending toward the inner space (11-12), staggered from the annular side plate (11-2) to form a step; the inner plate (11-3) has a second through hole (11-31) and a plurality of third through holes (11-32); the third through holes (11-32) are spaced apart from the second through holes (11-31) and surround the second through holes (11-31); the inner plate (11-3) is connected to the shaft sleeve insert (13).

3. The external rotor fan rotor assembly according to claim 2, wherein: The second through hole (11-31) is arranged at the middle position of the inner plate (11-3), and the number is one; The number of the third through holes (11-32) is six, which are evenly distributed on the inner plate (11-3) along the circumferential direction and surround the second through holes (11-31).

4. The external rotor fan rotor assembly according to claim 3, wherein: The shaft (12) is a section of a circular shaft, and has at least two grooves (12-1) on one end. The grooves (12-1) are embedded in the shaft sleeve insert (13) and connected to the shaft sleeve insert (13).

5. The outer rotor blower rotor assembly according to claim 4, characterized in that: The shaft sleeve insert (13) comprises: an outer stopper (13-1), one side wall of which is in contact with one side wall of the inner plate (11-3), and is arranged outside the inner space (11-12); A first filling portion (13-2), one end of which is connected to the outer stopper (13-1), and the other end of which passes through the second through hole (11-31), is arranged in the inner space (11-12) and is connected to the shaft (12); A plurality of second filling portions (13-3) are arranged one-to-one with the third through holes (11-32) to fill the third through holes (11-32); And an inner stopper (13-4), connected to the first filling portion (13-2) and the second filling portion (13-3), disposed within the inner space (11-12), fitting against the other side wall on the inner side plate (11-3), and together with the outer stopper (13-1), clamping the inner side plate (11-3).

6. The outer rotor fan rotor assembly according to claim 5, wherein: The outer diameter dimension of the outer stopper (13-1) is larger than the outer diameter dimension of the inner stopper (13-4), and the other side wall of the outer stopper (13-1) is flush with the side wall of the annular side plate (11-2).

7. The external rotor fan rotor assembly according to claim 5 or 6, characterized in that: One end of the first filling portion (13-2) is connected to the outer stopper (13-1), the middle position fills the second through hole (11-31), the other end has a tapered surface (13-21), and the first filling portion (13-2) also has an inner hole (13-22). There are at least two protrusions (13-22-1) in the inner hole (13-22). One end of the shaft (12) is connected at the inner hole (13-22), and the protrusions (13-22-1) are embedded in the grooves (12-1).

8. The outer rotor fan rotor assembly according to claim 2, wherein: The magnetic ring (20) is connected to the annular side wall (11-1), disposed within the inner space (11-12), and one end end face A of the magnetic ring (20) is flush with the other end end face B of the annular side wall (11-1). The magnetic ring (20) is spaced from the annular side plate (11-2), the shaft (12), and the bushing insert (13).

9. The external rotor fan rotor assembly according to claim 2 or 6, characterized in that: The middle position of the impeller upper plate insert (30) is connected to one end of the casing (11), surrounds the rotor assembly (10), and forms an integral body with the casing (11) through an insert injection molding process. The edge position of the impeller upper plate insert (30) extends in a direction away from the rotor assembly (10).

10. The outer rotor fan rotor assembly according to claim 9, wherein: The impeller upper plate insert (30) includes: a middle outer wrapper (31), wrapped around the outer walls of the annular side wall (11-1) and the annular side plate (11-2); A first disk body (32), connected to one end of the middle outer wrapper (31), surrounding the middle outer wrapper (31). The thickness dimension of the first disk body (32) is smaller than the thickness dimension of the middle outer wrapper (31). A stepped space (32-1) is formed between the first disk body (32) and the middle outer wrapper (31), and a number of fourth through holes (32-2) are spaced on the first disk body (32); And a number of third filling portions (33), spaced within the middle outer wrapper (31), arranged one-to-one with the first through hole (11-11), and filling the first through hole (11-11).

11. The external rotor blower rotor assembly according to claim 10, wherein: The impeller lower plate (40) includes: a second disk body (41), disposed at the stepped space (32-1), surrounding the middle outer wrapper (31) at the middle part, spaced from the middle outer wrapper (31), and the outer edge is flush with the outer circle of the first disk body (32); A plurality of blades (42), evenly distributed on the second disk body (41), are arranged between the second disk body (41) and the first disk body (32); And a plurality of fourth filling parts (43), two of the fourth filling parts (43) are provided on one blade (42), and one fourth filling part (43) fills one fourth through hole (32-2).

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