Fan assembly and duct type air conditioner

Abstract

The invention discloses a fan assembly and a duct type air conditioner, and belongs to the technical field of air conditioners. The fan assembly comprises a motor, a fan, a fixing piece and a fastening piece. The motor is connected with a driving shaft; the fan comprises a middle disc; the plurality of blades are arranged along the periphery of the middle disc; the shaft ring is connected to the middle of the middle disc and extends in the axial direction of the fan, and a penetrating part is arranged on the shaft ring so that the driving shaft can penetrate through the shaft ring; the fixing piece is connected with the side wall of the shaft ring; and the fastening piece is in threaded connection with the fixing piece in the radial direction of the shaft ring, and the end of the fastening piece abuts against the driving shaft so as to abut against the driving shaft. The duct type air conditioner comprises the fan assembly. According to the fan assembly and the duct type air conditioner, the connection between the driving shaft and the fan is simplified, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, and particularly to a fan assembly and an air duct machine. Background Art

[0002] An air duct machine belongs to a type of air conditioner. In an air duct machine, a shaft sleeve is connected to the center of a fan, and a damping rubber ring is sleeved on the outer wall of the shaft sleeve. The shaft sleeve is used to connect with the output shaft or transmission shaft of a motor. This structural form has problems such as complex shaft sleeve structure, more materials used, and high cost. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a fan assembly and an air duct machine, which cancel the shaft sleeve, simplify the connection between the shaft and the fan, and reduce costs.

[0004] On the one hand, a fan assembly of this application includes a motor, a fan, a fixing member, and a fastening member; the motor is connected with a driving shaft;

[0005] The fan includes: a middle plate; a plurality of blades arranged along the outer circumference of the middle plate; a shaft ring connected to the middle of the middle plate and extending along the axial direction of the fan. A through hole is provided on the shaft ring for the driving shaft to pass through;

[0006] The fixing member is connected to the side wall of the shaft ring; the fastening member is screwed to the fixing member, and the end of the fastening member abuts against the driving shaft to tighten the driving shaft.

[0007] In this application, by providing a fixing member connected to the fan, and then tightening the driving shaft by screwing the fastening member to the fixing member, the driving shaft can drive the fan to rotate. Compared with the problems of complex structure and high cost caused by connecting the fan and the driving shaft through a shaft sleeve in the prior art, the connection structure of this application is simpler and has lower costs.

[0008] In some embodiments, the shaft ring includes: an outer ring portion including an arc segment and a flat plate segment connected to each other; an inner ring portion provided inside the outer ring portion, and a through hole is provided on the inner ring portion; an avoidance portion extending from the outer side surface of the flat plate segment to the through hole for the fastening member to pass through;

[0009] The fixing member includes: a platform portion connected to the flat plate segment, and an installation hole is provided on the platform portion; the fastening member passes through the installation hole and the avoidance portion.

[0010] In this application, by connecting the platform portion of the fixing member to the flat plate segment, the connection between the fixing member and the shaft ring is realized.

[0011] In some embodiments, the platform portion abuts against the outer side of the flat plate segment; the fixing member further includes: a claw abutting against the inner side of the flat plate segment; a connecting portion connecting the platform portion and the claw.

[0012] In this application, the platform portion of the fixing member and the clamping jaws clamp the flat plate section from the inside and outside to realize the connection between the fixing member and the collar.

[0013] In some embodiments, the fan includes: two limiting vertical ribs arranged at intervals, and the limiting vertical ribs are connected to the outer side of the collar; the platform portion is inserted between the two limiting vertical ribs.

[0014] In this application, by inserting the platform portion between the two limiting vertical ribs, the relative rotation of the fixing member with respect to the fan is restricted.

[0015] In some embodiments, the fixing member further includes: an end plate connected to the platform portion, and the end plate penetrates through the drive shaft;

[0016] An installation groove for inserting the platform portion is provided on the outer ring portion, and the installation groove is formed by inward depression from the end face of the collar.

[0017] In this application, by inserting the platform portion into the installation groove on the collar, the connection between the fixing member and the collar is realized.

[0018] In some embodiments, a limiting rib portion is provided on the fan, and the limiting rib portion is connected to the inner side or the outer side of the outer ring portion;

[0019] The fixing member further includes: a limiting portion connected to the end plate, and the limiting portion abuts against the side of the limiting rib portion away from the installation groove.

[0020] In this application, by arranging the cooperation between the limiting portion and the limiting rib portion, the fixing member is restricted from moving the fastener away from the drive shaft.

[0021] In some embodiments, the fixing member further includes: an end plate connected to the platform portion, and the end plate penetrates through the drive shaft; a plugging portion connected to the side of the platform portion away from the end plate; an insertion groove for inserting the plugging portion is provided on the outer ring portion, and the insertion groove is formed by inward depression from the outer side face of the outer ring portion.

[0022] In this application, by arranging the cooperation between the plugging portion and the insertion groove, the positioning of the fixing member on the collar is realized.

[0023] In some embodiments, a limiting rib wall is provided on the collar and connected between the outer ring portion and the inner ring portion; the fixing member further includes: a limiting portion connected to the end of the end plate away from the platform portion, and a limiting groove is provided on the limiting portion, and the limiting groove is in plugging cooperation with the limiting rib wall.

[0024] In this application, by arranging the cooperation between the limiting portion and the limiting rib wall, multiple positionings of the fixing member and the fan are realized, ensuring the stability of their connection.

[0025] In some embodiments, the fixing member is connected inside the side wall of the collar; the fixing member includes: a first connecting portion; a second connecting portion connected to one end of the first connecting portion close to the drive shaft, a stepped shape is formed at the connection of the second connecting portion and the first connecting portion and projected on a plane perpendicular to the axis of the fixing member, and the outer contour line of the second connecting portion is located outside the first connecting portion; a mounting hole penetrating through the first connecting portion and the second connecting portion for screwing a fastening member.

[0026] In this application, by setting the fixing member in a stepped shape, the positioning and installation of the fixing member on the collar can be facilitated, and the fixing member can be prevented from coming out of the collar through the cooperation of the stepped surface and the collar.

[0027] In some embodiments, the fan assembly is a centrifugal fan.

[0028] On the other hand of this application, an air duct machine includes a housing provided with an air inlet and an air outlet; a heat exchanger disposed inside the housing for exchanging heat with the air passing through it; and the fan assembly as described above for driving the air to flow from the air inlet to the heat exchanger and then blow out from the air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shows a schematic diagram of an air duct machine according to some embodiments;

[0030] Figure 2 Shows a cross-sectional view of an air duct machine according to some embodiments;

[0031] Figure 3 Shows a cross-section of an air duct machine according to some embodiments Figure 2 ;

[0032] Figure 4 Shows Figure 3 an enlarged view taken in the direction of arrow I in

[0033] Figure 5 Shows a schematic diagram of a fan in an air duct machine according to some embodiments;

[0034] Figure 6 Shows a partial schematic diagram of a fan in an air duct machine according to some embodiments;

[0035] Figure 7 Shows a schematic diagram of a fixing member in an air duct machine according to some embodiments;

[0036] Figure 8 Shows a side view of a fixing member in an air duct machine according to some embodiments;

[0037] Figure 9 Shows a side view of a fixing member in an air duct machine according to some embodiments Figure 2 ;

[0038] Figure 10 Shows a partial rear view of the fan in an air duct machine according to some embodiments;

[0039] Figure 11 Shows Figure 10 A cross-sectional view taken along the line II-II;

[0040] Figure 12 Shows a partial cross-sectional view of the connection between the fan and the drive shaft in an air duct machine according to some embodiments Figure 2 ;

[0041] Figure 13 Shows a schematic diagram of the fan in an air duct machine according to some embodiments Figure 2 ;

[0042] Figure 14 Shows a partial schematic diagram of the fan in an air duct machine according to some embodiments Figure 2 ;

[0043] Figure 15 Shows a partial rear view of the fan in an air duct machine according to some embodiments Figure 2 ;

[0044] Figure 16 Shows a schematic diagram of the fixing member in an air duct machine according to some embodiments Figure 2 ;

[0045] Figure 17 Shows a cross-sectional view of the fixing member in an air duct machine according to some embodiments;

[0046] Figure 18 Shows a schematic diagram of the connection between the fan and the fixing member in an air duct machine according to some embodiments;

[0047] Figure 19 Shows a partial schematic diagram of the fan in an air duct machine according to some embodiments Figure 3 ;

[0048] Figure 20 Shows a schematic diagram of the fixing member in an air duct machine according to some embodiments Figure 3 ;

[0049] Figure 21 Shows a partial schematic diagram of the connection between the fan and the fixing member in an air duct machine according to some embodiments;

[0050] Figure 22 Shows a partial cross-sectional view of the connection between the fan and the drive shaft in an air duct machine according to some embodiments Figure 3 ;

[0051] Figure 23 Shows a partial cross-sectional view of the connection between the fan and the drive shaft in an air duct machine according to some embodiments Figure 4 ;

[0052] Figure 24 Shows a partial schematic of the fan in an air duct machine according to some embodiments Figure 4 ;

[0053] Figure 25 Shows a partial cross-sectional view of the fan in an air duct machine according to some embodiments;

[0054] Figure 26 Shows Figure 25 The cross-sectional view taken along the line B-B in;

[0055] Figure 27 Shows a schematic of the fixing member in an air duct machine according to some embodiments Figure 4 ;

[0056] Figure 28 Shows a cross-section of the fixing member in an air duct machine according to some embodiments Figure 2 ;

[0057] Figure 29 Shows a side view of the fixing member in an air duct machine according to some embodiments Figure 3 ;

[0058] Figure 30 Shows a partial cross-sectional view of the connection between the fan and the drive shaft in an air duct machine according to some embodiments Figure 5 ;

[0059] Figure 31 Shows a partial cross-sectional view of the connection between the fan and the drive shaft in an air duct machine according to some embodiments Figure 6 ;

[0060] Figure 32 Shows a partial schematic of the fan in an air duct machine according to some embodiments Figure 5 ;

[0061] Figure 33 Shows a schematic of the fixing member in an air duct machine according to some embodiments Figure 5 ;

[0062] Figure 34 Shows a partial cross-sectional view of the fan and the fixing member in an air duct machine according to some embodiments;

[0063] Figure 35 And Figure 36 Shows a partial side view of the fan in an air duct machine according to some embodiments Figure 2 ;

[0064] Figure 37 Shows a side view of the fan and the fixing member in an air duct machine according to some embodiments Figure 4 ;

[0065] Figure 38Shows a partial cross-section of the connection between the fan and the drive shaft in an air duct machine according to some embodiments Figure 7 ;

[0066] Figure 39 Shows a partial schematic diagram of the connection between the fan and the drive shaft in an air duct machine according to some embodiments;

[0067] Figure 40 Shows a partial schematic of the fan in an air duct machine according to some embodiments Figure 6 ;

[0068] Figure 41 Shows a schematic of the drive shaft in an air duct machine according to some embodiments Figure 1 ;

[0069] Figure 42 Shows a schematic of the fixing member in an air duct machine according to some embodiments Figure 6 ;

[0070] Figure 43 Shows a side view of the fan and the fixing member in an air duct machine according to some embodiments Figure 5 ;

[0071] Figure 44 Shows a schematic of the fixing member in an air duct machine according to some embodiments Figure 7 ;

[0072] Figure 45 Shows a schematic of the drive shaft in an air duct machine according to some embodiments Figure 2 ;

[0073] Figure 46 Shows a partial cross-section of the connection between the fan and the drive shaft in an air duct machine according to some embodiments Figure 8 。 Detailed implementation manners

[0074] To make the purpose and implementation manners of this application clearer, the following will clearly and completely describe the exemplary implementation manners of this application with reference to the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only a part of the embodiments of this application, rather than all of the embodiments.

[0075] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0076] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0077] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] The air duct machine of this application belongs to a type of air conditioner.

[0079] Refer to Figure 1 and Figure 2 , the air duct machine according to an embodiment of this application includes a housing 10.

[0080] The housing 10 is generally in a cuboid shape, forming the appearance of the air duct machine. The housing 10 includes a bottom plate 11 forming the bottom structure, a top plate 12 forming the top structure, and side plates connected between the bottom plate 11 and the top plate 12.

[0081] An air outlet 10a is provided on one side plate of the housing 10. An air inlet 10b is provided on the side of the housing 10 opposite to the air outlet 10a, or an air inlet 10b is provided on the side of the bottom plate 11 of the housing 10 away from the air outlet 10a.

[0082] Indoor air enters the housing 10 through the air inlet 10b and returns to the indoor space through the air outlet 10a.

[0083] A middle partition 13 is provided inside the housing 10. The middle partition 13 divides the space inside the housing 10 into two chambers, one chamber is the air inlet chamber 141, and the other chamber is the air outlet chamber 142.

[0084] The air inlet 10b is communicated with the air inlet chamber 141, and the air outlet 10a is communicated with the air outlet chamber 142.

[0085] The air duct machine includes a fan assembly 20. The fan assembly 20 can be arranged in the air inlet chamber 141.

[0086] The fan assembly 20 can be a centrifugal fan, which includes a volute 21. Suction openings 21a are provided on two sides of the volute 21 perpendicular to its axis.

[0087] The volute 21 is provided with an air outlet part 211, and an air outlet 21b is formed at the end of the air outlet part 211. The air outlet part 211 is a part extending outward from the cylindrical part of the volute 21.

[0088] The air outlet part 211 of the volute 21 penetrates through the middle partition plate 13, or the air outlet 21b of the volute 21 is opposite to the opening on the middle partition plate 13, so that the air outlet 21b of the volute 21 is communicated with the air outlet cavity 142.

[0089] The fan assembly 20 includes a fan 22. The fan 22 is arranged inside the volute 21. Specifically, the fan 22 can be arranged inside the cylindrical part of the volute 21.

[0090] The fan assembly 20 may include a motor 23. The motor 23 provides a rotational driving force outward when connected to an external power supply. The motor 23 is connected with a driving shaft 230, and the driving shaft 230 is connected with the fan 22 to drive the fan 22 to rotate.

[0091] When the motor 23 is powered on, the fan 22 rotates, so that the indoor air enters the air inlet cavity 141 from the air inlet 10b, then flows into the volute 21 through the air suction port 21a, continues to be blown from the air outlet 21b of the volute 21 to the air outlet cavity 142, and finally is sent to the indoor through the air supply port 10a.

[0092] The air duct machine includes a heat exchanger 50. The heat exchanger 50 is arranged inside the air outlet cavity 142 and is located on the air flow path, and is used for exchanging heat with the air passing through it.

[0093] The air flow generated by the fan 22 flows through the air outlet 21b of the volute 21 to the heat exchanger 50 under the guidance of the volute 21. The air exchanges heat with the refrigerant flowing in the heat exchanger 50, so as to realize the cooling or heating of the air flow.

[0094] In some embodiments, the fan assembly 20 includes two fans 22. The two fans 22 can be arranged at intervals along the length direction of the middle partition plate 13.

[0095] The motor 23 can be arranged between the two fans 22. The motor 23 is a double-shaft motor 23. The two output shafts 231 of the motor 23 are driving shafts 230, and each of the two driving shafts 230 is connected with a fan 22 to drive the fan 22 to rotate.

[0096] In some embodiments, referring to Figure 3 , the fan assembly 20 includes three fans 22. The three fans 22 can be arranged at intervals along the length direction of the middle partition plate 13.

[0097] The motor 23 is located between any two adjacent fans 22. One fan 22 is on the first side of the motor 23, and two fans 22 are on the second side of the motor 23.

[0098] The output shaft 231 on the first side of the motor 23 is the drive shaft 230, and the drive shaft 230 on this side is connected to a fan 22.

[0099] The output shaft 231 on the second side of the motor 23 can be connected to the transmission shaft 232 through a coupling 26 to extend the output shaft 231. The output shaft 231 and the transmission shaft 232 on this side are the drive shaft 230. The drive shaft 230 is connected to two fans 22 on this side.

[0100] This application has improved the connection structure between the drive shaft 230 and the fan 22:

[0101] In some embodiments, referring to Figures 4 to 6 , the fan 22 includes a middle plate 221. The outer periphery of the middle plate 221 can be circular.

[0102] In some embodiments, the fan 22 may include blades 222. The blades 222 are connected to the middle plate 221. A plurality of blades 222 can be arranged along the circumferential direction of the middle plate 221. The length direction of the blades 222 is parallel to the axis of the fan 22.

[0103] In some embodiments, the fan 22 includes a collar 30 for connecting to the drive shaft 230. The collar 30 is located at the center of the fan 22. The collar 30 extends along the axial direction of the fan 22.

[0104] In some embodiments, the collar 30 is connected to the middle of the middle plate 221. The collar 30 protrudes axially from the middle plate 221.

[0105] In some embodiments, the collar 30 is provided with a through portion 30a that penetrates axially for the drive shaft 230 to pass through. During assembly, the collar 30 of the fan 22 can be sleeved on the drive shaft 230.

[0106] In some embodiments, the fan assembly 20 may include a fixing member 40. The fixing member 40 is connected to the collar 30.

[0107] Fasteners such as screws or bolts are screwed to the fixing member 40, and the end of the fastener presses against the drive shaft 230, thereby realizing the connection between the fan 22 and the drive shaft 230 and preventing the drive shaft 230 from rotating relative to the fan 22.

[0108] In this application, by providing a fixing member 40 connected to the fan 22, and then pressing against the drive shaft 230 by screwing the fastener to the fixing member 40, the drive shaft 230 can drive the fan 22 to rotate. Compared with the problems of complex structure and high cost caused by connecting the fan 22 and the drive shaft 230 through a shaft sleeve in the prior art, the connection structure of this application is simpler and has lower cost.

[0109] In some embodiments, the fixing member 40 may be a metal member, such as a steel member. The fixing member 40 may be a sheet metal member, such as a steel plate.

[0110] In some embodiments, referring to Figure 4 , Figure 6 and Figure 7 , the fixing member 40 includes a platform portion 41. The platform portion 41 is disposed on the outer peripheral side of the collar 30. The fastening screw 25 is screwed to the platform portion 41 and then passes through the side wall of the collar 30 so that the end of the fastening screw 25 abuts against the drive shaft 230.

[0111] In some embodiments, a threaded mounting hole 410 is provided on the platform portion 41. The fastening screw 25 is connected in the mounting hole 410.

[0112] In some embodiments, by screwing a self-tapping screw into the platform portion 41, a thread is formed on the platform portion 41.

[0113] In some embodiments, an avoidance portion 30b is provided on the side wall of the collar 30 for the fastening screw 25 to pass through. The avoidance portion 30b is opposite to the platform portion 41. The avoidance portion 30b is coaxial with the mounting hole 410.

[0114] In some embodiments, an avoidance hole 2221 may be provided on the blade 222. The avoidance hole 2221 corresponds to the avoidance portion 30b on the collar 30. The avoidance hole 2221 is coaxial with the avoidance portion 30b on the collar 30.

[0115] The diameter of the avoidance hole 2221 is D2, D2≥5mm, which is beneficial for tools such as screwdrivers to pass through the avoidance hole 2221.

[0116] During assembly, an operator can insert a tool such as a screwdriver through the avoidance hole 2221 to reach the collar 30 for screw-tightening operations. Therefore, the provision of the avoidance hole 2221 on the blade 222 facilitates the assembly and maintenance operations and improves the assembly efficiency.

[0117] In some embodiments, the fixing member 40 is clamped between the side walls of the collar 30.

[0118] The fixing member 40 may include a claw 42 that extends into the interior of the collar 30. The platform portion 41 and the claw 42 clamp the side wall of the collar 30 from the inside and outside.

[0119] In this application, by providing the platform portion 41 and the claw 42 on the fixing member 40, and the platform portion 41 and the claw 42 clamp the side wall of the collar 30, radial limitation between the fixing member 40 and the collar 30 can be achieved.

[0120] The fastening screw 25 passes through the side walls of the fixing member 40 and the collar 30, and axial limitation between the fixing member 40 and the collar 30 can be achieved.

[0121] In some embodiments, the fixing member 40 may include a connecting portion 43. The connecting portion 43 is used to connect the platform portion 41 and the clamping jaw 42.

[0122] In some embodiments, the platform portion 41 and the clamping jaw 42 are spaced apart, and the connecting portion 43 is connected between the platform portion 41 and the clamping jaw 42.

[0123] In some embodiments, a recess 30c is provided on the collar 30. The recess 30c is formed by inward depression from the axial end face of the collar 30.

[0124] The clamping jaw 42 is inserted into the recess 30c of the collar 30 so that the clamping jaw 42 extends into the interior of the collar 30.

[0125] In some embodiments, the outer peripheral surface of the collar 30 includes an arc surface and a first plane 3421 connected to the arc surface.

[0126] The arc surface and the first plane 3421 are connected end to end. The platform portion 41 can abut against the first plane 3421.

[0127] In some embodiments, the recess 30c is a groove provided on the collar 30. The side surface of the recess 30c close to the first plane 3421 is the second plane 3422. The clamping jaw 42 can abut against the second plane 3422.

[0128] When the platform portion 41 of the fixing member 40 abuts against the first plane 3421, it can limit the movement of the fixing member 40 in the direction close to the second plane 3422; when the clamping jaw 42 of the fixing member 40 abuts against the second plane 3422, it can limit the movement of the fixing member 40 in the direction close to the first plane 3421.

[0129] In this application, by providing the first plane 3421 and the second plane 3422 on the collar 30, the limit between the fixing member 40 and the collar 30 is surface limit, which can increase the reliability of the limit, and the platform portion 41 and the clamping jaw 42 can be in the shape of a square block or a plate, which is beneficial to the processing and forming of the fixing member 40.

[0130] If the surface for limiting between the collar 30 and the fixing member 40 is an arc surface, then the platform portion 41 and the clamping jaw 42 also need to be made into an arc shape, which will increase the manufacturing difficulty of the fixing member 40.

[0131] In some embodiments, a protrusion 3423 is provided on the second plane 3422. The length direction of the protrusion 3423 can extend along the axial direction of the fan 22.

[0132] In some embodiments, referring to Figure 8 and Figure 10, the distance from the protrusion 3423 to the first plane 3421 is Lb1, the distance between the platform portion 41 and the claw 42 is La1, and the relationship between Lb1 and La1 satisfies: Lb1 ≤ La1, which can ensure that the platform portion 41 and the claw 42 can clamp the collar 30.

[0133] When Lb1 = La1, the platform portion 41 and the claw 42 need to be slightly opened to clamp the collar 30. By providing the protrusion 3423, the contact area between the claw 42 and the collar 30 can be reduced, and the deformation amount of the opening between the platform portion 41 and the claw 42 can be decreased, which is beneficial to the installation of the fixing member 40 onto the collar 30.

[0134] In some embodiments, the relationship between Lb1 and La1 satisfies: La1 ≤ Lb1 + 4 mm. There is a small clearance fit between La1 and Lb1.

[0135] If La1 > Lb1 + 4 mm, then the clearance between the fixing member 40 and the collar 30 in the direction perpendicular to the first plane 3421 is relatively large, the movable space between the fixing member 40 and the collar 30 is large, and the fixing member 40 will drive the fastening screw 25 to move, resulting in the fastening screw 25 being unable to tightly press against the drive shaft 230.

[0136] In some embodiments, a chamfer is provided at the outer end in the length direction of the protrusion 3423. This chamfer has a guiding effect on the insertion of the claw 42 into the recess 30c, which is beneficial to the installation operation of the claw 42 into the recess 30c.

[0137] In some embodiments, continue to refer to Figure 6 , the collar 30 includes an outer ring portion 34. The outer ring portion 34 forms the outer shape structure of the collar 30.

[0138] The outer ring portion 34 can be formed by connecting a circular arc segment 341 and a flat plate segment 342 end to end.

[0139] The circular arc segment 341 is a major arc, and the flat plate segment 342 is in a flat plate shape and is connected to both ends of the circular arc segment 341.

[0140] One axial end of the outer ring portion 34 is connected to the middle plate 221, and the other axial end of the outer ring portion 34 is located on the side away from the middle plate 221.

[0141] The platform portion 41 and the claw 42 are clamped on the flat plate segment 342. The platform portion 41 is provided on the outer side of the flat plate segment 342, and the claw 42 is provided on the inner side of the flat plate segment 342.

[0142] The outer side surface of the flat plate segment 342 is the first plane 3421, and the inner side surface of the flat plate segment 342 is the second plane 3422.

[0143] In some embodiments, the collar 30 includes an inner ring portion 35. The inner ring portion 35 is annular. The inner ring portion 35 is located within the outer ring portion 34. The inner ring portion 35 is coaxial with the arc segment 341.

[0144] The inner circle of the inner ring portion 35 forms a through portion 30a. The drive shaft 230 is inserted into the inner ring portion 35. Chamfers are provided at the axial ends of the inner ring portion 35, which is beneficial to the insertion of the drive shaft 230 into the inner ring portion 35.

[0145] One axial end of the inner ring portion 35 is connected to the middle plate 221, and the other axial end of the inner ring portion 35 is located on the side away from the middle plate 221.

[0146] In some embodiments, the space between the outer ring portion 34 and the inner ring portion 35 forms a recess 30c.

[0147] In some embodiments, the collar 30 includes a plurality of first reinforcing ribs 381. The plurality of first reinforcing ribs 381 are radially connected between the outer ring portion 34 and the inner ring portion 35.

[0148] By providing the plurality of first reinforcing ribs 381, the structural strength of the collar 30 can be enhanced.

[0149] In some embodiments, the fan 22 is provided with limiting vertical ribs 224. The limiting vertical ribs 224 are connected to the middle plate 221 and the collar 30. The two limiting vertical ribs 224 are spaced apart.

[0150] Of the adjacent two side surfaces of the limiting vertical rib 224, one side surface is connected to the middle plate 221, and the other side surface is connected to the collar 30.

[0151] The limiting vertical rib 224 can be connected to the flat plate segment 342 of the collar 30.

[0152] The platform portion 41 is inserted between the two limiting vertical ribs 224. The limiting vertical ribs 224 limit the platform portion 41 to restrict the rotation of the fixing member 40 relative to the collar 30.

[0153] In addition, the limiting vertical rib 224 can serve as a reinforcing rib to enhance the structural strength of the fan 22.

[0154] In some embodiments, referring to Figure 7 、 Figure 9 and Figure 10 , the end of the platform portion 41 away from the connecting portion 43 is inserted between the two limiting vertical ribs 224.

[0155] In some embodiments, the two limiting vertical ribs 224 are respectively a first limiting vertical rib 2241 and a second limiting vertical rib 2242.

[0156] The portion of the platform portion 41 limited between the two limiting vertical ribs 224 is the extension portion 411.

[0157] The extension portion 411 includes a first positioning plane 412. The first positioning plane 412 is close to the first limiting rib 2241. Specifically, the first positioning plane 412 faces the first limiting rib 2241.

[0158] The extension portion 411 includes a second positioning plane 413. The second positioning plane 413 is close to the second limiting rib 2242. Specifically, the second positioning plane 413 faces the second limiting rib 2242.

[0159] The arrangement directions of the first positioning plane 412 and the second positioning plane 413 are the same as the arrangement direction of the two limiting ribs 224.

[0160] Exemplarily, the two limiting ribs 224 are arranged left and right. The first limiting rib 2241 is located on the left side of the second limiting rib 2242, and the second limiting rib 2242 is located on the right side of the first limiting rib 2241.

[0161] The first positioning plane 412 is the left side surface of the extension portion 411, and the second positioning plane 413 is the right side surface of the extension portion 411.

[0162] When the first positioning plane 412 abuts against the first limiting rib 2241, the movement of the fixing member 40 relative to the fan 22 to the left side can be restricted; when the second positioning plane 413 abuts against the second limiting rib 2242, the movement of the fixing member 40 relative to the fan 22 to the right side can be restricted.

[0163] In some embodiments, the extension portion 411 includes a first inclined surface 414. The first inclined surface 414 is connected to one end of the first positioning plane 412 away from the connecting portion 43.

[0164] The extension portion 411 may include a second inclined surface 415. The second inclined surface 415 is connected to one end of the second positioning plane 413 away from the connecting portion 43.

[0165] In the installation direction of the extension portion 411 relative to the limiting rib 224, the first inclined surface 414 and the second inclined surface 415 are inclined towards each other.

[0166] For the convenience of description, the installation direction of the extension portion 411 relative to the limiting rib 224 is defined as from back to front.

[0167] In the direction from back to front, the distance between the first inclined surface 414 and the second inclined surface 415 gradually decreases.

[0168] Since the distance between the first inclined surface 414 and the second inclined surface 415 at the front end is relatively small, it is beneficial to the insertion operation of the extension portion 411 into the fan 22.

[0169] In some embodiments, refer toFigure 9 and Figure 10 The distance between two limiting vertical ribs 224 is Lb2. The distance between the first positioning plane 412 and the second positioning plane 413 is La2.

[0170] The relationship between Lb2 and La2 satisfies: La2 < Lb2. In this way, it can be ensured that the extension part 411 can be inserted between the two limiting vertical ribs 224.

[0171] In some embodiments, the relationship between Lb2 and La2 satisfies: Lb2 ≤ La2 + 8 mm. Within this dimensional relationship, it can be ensured that the gap between the extension part 411 and the two limiting vertical ribs 224 is relatively small, avoiding a large movement of the fixing member 40 relative to the fan 22 when the gap is too large, thereby affecting the effect of the fastening screw 25 connecting to the fixing member 40 to tightly press against the drive shaft 230.

[0172] In some embodiments, continue to refer to Figure 6 The limiting vertical rib 224 is in the shape of a right-angled triangular plate. One right-angled side surface of the limiting vertical rib 224 is connected to the middle plate 221, and the other right-angled side surface of the limiting vertical rib 224 is connected to the first plane 3421 of the shaft collar 30.

[0173] In some embodiments, the fan 22 is provided with a second reinforcing rib 225. The second reinforcing rib 225 is radially connected to the outer peripheral side of the shaft collar 30, and the second reinforcing rib 225 is connected to the middle plate 221. The second reinforcing rib 225 can increase the structural strength of the fan 22.

[0174] The second reinforcing rib 225 is generally in the shape of a triangular plate. One side surface of the second reinforcing rib 225 that forms a triangle is connected to the middle plate 221, and the other side surface of the second reinforcing rib 225 that forms a triangle is connected to the outer periphery of the shaft collar 30.

[0175] The first reinforcing rib 381 and the second reinforcing rib 225 are located on different diameter lines of the shaft collar 30, so that the first reinforcing rib 381 and the second reinforcing rib 225 are distributed dispersedly in the circumferential direction, and the structural strength of the shaft collar 30 can be increased as much as possible.

[0176] In some embodiments, refer to Figure 7 The platform portion 41 includes a platform body portion 416. The extension portion 411 extends from the end surface of the platform body portion 416 in a direction away from the connecting portion 43.

[0177] A first step surface 417 is formed at the connection between the platform body portion 416 and the extension portion 411. In the assembled state, the first step surface 417 abuts against the end surface of the limiting vertical rib 224 that is far from the middle plate 221, that is, the first step surface 417 abuts against the rear end surface of the limiting vertical rib 224.

[0178] In some embodiments, refer toFigure 9 and Figure 11 The length of the limiting vertical rib 224 in the axial direction of the fan 22 is Lb3, and the length of the extension part 411 in the axial direction of the fan 22 is La3. The following relationship is satisfied between Lb3 and La3: Lb3 ≥ La3. Within this condition range, it can be ensured that the first step surface 417 on the fixing part 40 abuts against the limiting vertical rib 224, so as to realize the positioning of the fixing part 40 and the fan 22 in the axial direction.

[0179] In some embodiments, the length from the inner wall of the connecting part 43 to the free end of the claw 42 is La4, and La3 ≥ La4. Within this dimensional relationship, the problem of increasing cost due to the too long claw 42 can be avoided; in addition, when the claw 42 is relatively long, the contact area between the claw 42 and the collar 30 is relatively large, which will increase the difficulty of installing the fixing part 40 onto the collar 30 when Lb1 = La1.

[0180] In some embodiments, the distance from the rear end of the collar 30 to the edge of the avoiding part 30b is Lb4, and the distance from the inner wall (front wall) of the connecting part 43 to the edge of the mounting hole 410 is La5. When Lb4 < La5, it can be ensured that the mounting hole 410 on the fixing part 40 can be aligned with the avoiding part 30b on the collar 30.

[0181] If Lb4 ≥ La5, then there will be a phenomenon that the connecting part 43 is aligned with the rear end of the collar 30, but the mounting hole 410 is misaligned with the avoiding part 30b.

[0182] In some embodiments, the connecting part 43 is connected to the end of the platform part 41 and the claw 42.

[0183] In some embodiments, there are two claws 42 arranged at intervals. The space between the two claws 42 is for the driving shaft 230 to pass through.

[0184] Referring to Figures 12 to 21 , the present application also provides a connection form between the fixing part 40 and the fan 22:

[0185] Specifically referring to Figure 12 , the fixing part 40 is sleeved on the driving shaft 230 and is limited on the collar 30.

[0186] In some embodiments, referring to Figure 16 and Figure 17 , the fixing part 40 includes an end plate 44. A through limiting hole 441 is provided on the end plate 44 for the driving shaft 230 to pass through. The end plate 44 is connected to one axial end of the collar 30.

[0187] In some embodiments, the platform part 41 is connected to the end plate 44 at an angle. The platform part 41 extends from the end plate 44 towards the direction close to the middle plate 221.

[0188] In some embodiments, a limiting structure is provided between the platform portion 41 and the collar 30 so that the fixing member 40 can be limited on the collar 30.

[0189] In some embodiments, the platform portion 41 is inserted into the collar 30 to limit the rotation of the fixing member 40 relative to the collar 30.

[0190] In some embodiments, referring to Figure 14 and Figure 15 , an installation groove 36 is provided on the collar 30 at a position corresponding to the avoidance portion 30b. The platform portion 41 is inserted into the installation groove 36 to realize the installation of the platform portion 41 on the collar 30.

[0191] The installation groove 36 can be formed by the end face of the collar 30 being recessed inward along the axis.

[0192] For the convenience of description, it is defined that the end plate 44 is located at the rear side of the collar 30, the fastening screw 25 is connected to the platform portion 41 from top to bottom, and the direction perpendicular to both the up-down direction and the front-back direction is the left-right direction. The installation groove 36 is formed by the rear end face of the collar 30 being recessed forward.

[0193] In some embodiments, referring to Figure 14 and Figure 15 , the collar 30 is provided with a first plane 3421 that encloses the installation groove 36. The platform portion 41 abuts against the first plane 3421. Specifically, the lower surface of the platform portion 41 abuts against the first plane 3421

[0194] In some embodiments, the collar 30 is provided with two stop surfaces that enclose the installation groove 36.

[0195] The two stop surfaces are respectively a first stop surface 361 and a second stop surface 361. The first stop surface 361 and the second stop surface 362 are oppositely arranged and are respectively connected to the left and right sides of the first plane 3421.

[0196] The platform portion 41 is limited between the first stop surface 361 and the second stop surface 362.

[0197] In some embodiments, the installation groove 36 is in the shape of a keyway. The side of the installation groove 36 away from the through portion 30a is open, that is, the upper side of the installation groove 36 is open.

[0198] During assembly, since the upper end of the installation groove 36 is open, the platform portion 41 can also be installed in the installation groove 36 from top to bottom.

[0199] The avoidance portion 30b communicates between the installation groove 36 and the through portion 30a.

[0200] In some embodiments, the avoidance portion 30b can be in the shape of a notch. The end of the avoidance portion 30b away from the middle plate 221 is open.

[0201] During assembly, the fastening screw 25 can be first installed on the fixing member 40. Since the rear end of the avoidance portion 30b is open, the platform portion 41 can be inserted into the installation groove 36 from the rear to the front. That is to say, the fixing member 40 can drive the fastening screw 25 connected thereto to be inserted into the collar 30 from the rear to the front.

[0202] In this application, since the fastening screw 25 can be first installed on the fixing member 40 and then the fixing member 40 is installed on the collar 30, it avoids the problem of inconvenient operation caused by manually positioning the fastening screw 25 when first installing the fixing member 40 on the collar 30 and then installing the fastening screw 25 on the fixing member 40. This application is beneficial to the installation of the fastening screw 25 and improves the assembly efficiency.

[0203] In some embodiments, referring to Figure 15 and Figure 16 , the platform portion 41 has opposite first positioning planes 412 and second positioning planes 413.

[0204] The arrangement directions of the first positioning plane 412 and the second positioning plane 413 are the same as the arrangement directions of the two stop surfaces. The first positioning plane 412 faces the first stop surface 361, and the second positioning plane 413 faces the second stop surface 362.

[0205] The first positioning plane 412 is on the left side, and the second positioning plane 413 is on the right side. The first stop surface 361 is on the left side, and the second stop surface 362 is on the right side.

[0206] When the first positioning plane 412 abuts against the first stop surface 361, it can limit the movement of the platform portion 41 to the left; when the second positioning plane 413 abuts against the second stop surface 362, it can limit the movement of the platform portion 41 to the right.

[0207] In some embodiments, the platform portion 41 has a first inclined surface 414. The first inclined surface 414 is connected to the side of the first positioning plane 412 away from the end plate 44, that is, the first inclined surface 414 is connected to the front side of the first positioning plane 412.

[0208] The platform portion 41 has a second inclined surface 415. The second inclined surface 415 is connected to the side of the second positioning plane 413 away from the end plate 44, that is, the second inclined surface 415 is connected to the front side of the second positioning plane 412.

[0209] From the rear to the front, the first inclined surface 414 and the second inclined surface 415 are inclined towards each other.

[0210] From the rear to the front, the distance between the first inclined surface 414 and the second inclined surface 415 gradually decreases.

[0211] Due to the settings of the first inclined surface 414 and the second inclined surface 415, the platform portion 41 presents a shape that is narrow at the front end and wide at the rear end. Since the left-right dimension of the front end of the platform portion 41 is smaller than the left-right dimension of the installation groove 36, the platform portion 41 can be inserted into the installation groove 36 more smoothly.

[0212] In some embodiments, the fixing member 40 includes a limiting portion 46. The limiting portion 46 is connected to the end plate 44.

[0213] The limiting portion 46 can be perpendicularly connected to the end plate 44. Both the limiting portion 46 and the platform portion 41 extend from the end plate 44 towards the direction close to the middle plate 221.

[0214] A limiting rib portion 383 can be provided inside the collar 30 or on the outer side of the collar 30. The limiting portion 46 abuts against the side surface of the limiting rib portion 383 that is far from the installation groove 36.

[0215] When the fastening screw 25 presses down tightly on the driving shaft 230, the driving shaft 230 gives an upward reaction force to the fastening screw 25. The fastening screw 25 drives the fixing member 40 to generate a small movement away from the driving shaft 230. The fixing member 40 uses its own stiffness to drive the limiting portion 46 to tightly clamp the limiting rib portion 383. Both the radial rotation and axial movement of the fan 22 and the driving shaft 230 are restricted, thereby effectively fixing the fan 22 on the driving shaft 230.

[0216] In some embodiments, with the plane Ln passing through the center of the fixing member 40 and parallel to the platform portion 41 as a reference, at least a part of the limiting portion 46 is located on the side of the plane Ln that is far from the platform portion 41. In this way, the cooperation between the platform portion 41 and the installation groove 36 can limit the upper side of the fixing member 40, and the cooperation between the limiting portion 46 and the limiting rib portion 383 can limit the middle and lower sides of the fixing member 40.

[0217] In some embodiments, referring to Figure 14 and Figure 15 , the limiting rib portion 383 is located inside the collar 30.

[0218] The collar 30 includes an outer ring portion 34 and an inner ring portion 35. The installation groove 36 can be provided on the outer ring portion 34.

[0219] The space between the inner ring portion 35 and the outer ring portion 34 forms a concave portion 30c. The limiting rib portion 383 is connected in the concave portion 30c.

[0220] In some embodiments, the limiting portion 46 is connected to the side of the end plate 44 that is far from the platform portion 41. The limiting portion 46 is located below the platform portion 41.

[0221] The limiting portion 46 extends into the concave portion 30 and is hooked to the side of the limiting rib portion 383 that is far from the installation groove 36 to limit the upward movement of the fixing member 40 relative to the fan 22.

[0222] In some embodiments, the limiting rib portion 383 is provided with a rib 3832. The limiting portion 46 abuts against the rib 3832.

[0223] The provision of the rib 3832 can reduce the contact area between the limiting portion 46 and the collar 30, reducing wear.

[0224] In some embodiments, there are a plurality of ribs 3832 arranged at intervals to ensure uniform stress on the limiting portion 46.

[0225] In some embodiments, a chamfer is provided at the end of the rib 3832 away from the middle plate 221 to facilitate the installation of the limiting portion 46 below the rib 3832.

[0226] In the present application, through the cooperation of the limiting portion 46 and the limiting rib portion 383, the lower part of the fixing member 40 can be limited together with the collar 30, preventing the lower part of the fixing member 40 from moving relative to the collar 30.

[0227] In some embodiments, there are two limiting rib portions 383 arranged left and right. Two limiting portions 46 are connected to the end plate 44. Each of the two limiting portions 46 corresponds to one limiting rib portion 383.

[0228] In the present application, the upper platform portion 41 of the fixing member 40 cooperates with the installation groove 36 of the collar 30 to form one limit, and the two limiting portions 46 respectively cooperate with the limiting rib portions 383 to form two limits, so that three limits are formed on the outer periphery of the fixing member 40 and the collar 30, which can ensure the stability and reliability of the limiting structure.

[0229] In some embodiments, the limiting rib portion 383 can be located below the through portion 30a. Correspondingly, the limiting portion 46 is connected to the lower end of the end plate 44.

[0230] The limiting rib portion 383 is parallel to the first plane 3421, and the extension planes of the two limiting rib portions 383 are coplanar.

[0231] In some embodiments, referring to Figure 15 , a first reinforcing rib 381 is connected between the outer ring portion 34 and the inner ring portion 35. The first reinforcing rib 381 and the limiting rib portion 383 are arranged at intervals. The first reinforcing rib 381 and the limiting rib portion 383 can be arranged in parallel. Both the first reinforcing rib 381 and the limiting rib portion 383 can enhance the structural strength of the collar 30.

[0232] In some embodiments, referring to Figure 18 , Figure 19 and Figure 21 , the limiting rib portion 383 is connected to the outside of the collar 30. The limiting rib portion 383 is connected to the outer peripheral surface of the collar 30. The front side surface of the limiting rib portion 383 is connected to the middle plate 221.

[0233] In some embodiments, referring to Figure 20 , a limiting groove 461 is provided on the limiting portion 46. The limiting groove 461 is in plug-in fit with the limiting rib portion 383. The lower side surface of the limiting groove 461 surrounded on the limiting portion 46 abuts against the limiting rib portion 383.

[0234] In some embodiments, the limiting portion 46 may be in a flat plate shape.

[0235] In some embodiments, referring to Figure 21 , the limiting portion 46 may be in an arc-shaped sheet shape. The center of the limiting portion 46 coincides with the center of the limiting hole 441. The inner arc surface of the limiting portion 46 may abut against the outer peripheral surface of the collar 30.

[0236] In some embodiments, an anti-rotation plane may be provided on the drive shaft 230. The limiting hole 441 on the fixing member 40 is set to a shape corresponding to the drive shaft 230.

[0237] That is, the limiting hole 441 is in a D shape, and the portion of the drive shaft 230 that cooperates with the limiting hole 441 is also in a D shape.

[0238] In some embodiments, referring to Figure 15 and Figure 17 , the distance from the lower end of the limiting rib portion 383 to the first plane 3421 is Lc1; the distance between the limiting portion 46 and the platform portion 41 on the fixing member 40 is Ld1. Lc1 ≤ Ld1 can ensure that the fixing member 40 can be normally installed on the collar 30.

[0239] Ld1 ≤ Lc1 + 1 mm. When the fastening screw 25 abuts against the drive shaft 230, the drive shaft 230 reacts on the fastening screw 25, giving the fastening screw 25 an upward force. The fastening screw 25 drives the fixing member 40 to generate a small movement away from the drive shaft 230. Since Ld1 ≤ Lc1 + 1 mm, the limiting portion 46 tightly clamps the limiting rib portion 383, restricting the upward movement of the fixing member 40, thereby ensuring that the fastening screw 25 can tightly abut against the drive shaft 230.

[0240] If Ld1 > Lc1 + 1 mm and the fitting clearance is large, then the function of the limiting portion 46 and the limiting rib portion 383 in cooperating to restrict the upward movement of the fixing member 40 will be affected.

[0241] In some embodiments, referring to Figure 15 and Figure 16 , on the collar 30, the distance between the first stop surface 361 and the second stop surface 362 is Lc2. The distance between the first positioning plane 412 and the second positioning plane 413 on the fixing member 40 is Ld2.

[0242] Ld2 < Lc2 can ensure that the platform part 41 can be normally installed at the installation groove 36.

[0243] Lc2 ≤ Ld2 + 1mm. A small clearance fit is formed between Lc2 and Ld2, which can ensure the limiting effect of the platform part 41 and the collar 30 in the left - right direction.

[0244] In some embodiments, referring to Figure 15 and Figure 17 , on the collar 30, the diameter of the through - part 30a is Dc1; on the fixing part 40, the diameter of the limiting hole 441 is Dd1. On the collar 30, the distance from the first plane 3421 to the bottom end of the through - part 30a is Lc3; on the fixing part 40, the distance from the lower side surface of the platform part 41 to the lower end of the limiting hole 441 is Ld3.

[0245] Dc1 + 0.2mm < Dd1. If Dc1 + 0.2mm ≥ Dd1, then the fit clearance between the limiting hole 441 and the drive shaft 230 is small, which may cause the platform part 41 not to be installed on the collar 30.

[0246] By setting Dc1 + 0.2mm < Dd1, the clearance between the drive shaft 230 and the fixing part 40 can be used to make the platform part 41 abut against the first plane 3421.

[0247] Lc3 ≤ Ld3 can ensure that the platform part 41 can be installed outside the first plane 3421 and the drive shaft 230 can pass through the limiting hole 441 of the fixing part 40.

[0248] Ld3 ≤ Lc3 + 1mm, so that the lower part of the circular side surface of the fixing part 40 surrounding the limiting hole 441 can abut against the drive shaft 230, restricting the upward movement of the fixing part 40, thereby ensuring that the fastening screw 25 can tightly press against the drive shaft 230.

[0249] In some embodiments, the thickness Tb of the fixing part 40 satisfies: 0.8mm ≤ Tb. Within this dimension range, the structural strength of the fixing part 40 can be ensured, avoiding the problem that the fixing part 40 is too thin and prone to deformation.

[0250] Tb ≤ 5mm. Within this range, the overall weight at the fan 22 can be avoided from increasing due to the fixing part 40 being too thick.

[0251] In some embodiments, a clamp can be connected to the drive shaft 230, and the clamp abuts against the side of the end plate 44 away from the collar 30.

[0252] Referring to Figures 22 to 29 , the present application also provides a connection form between the fixing part 40 and the fan 22:

[0253] In some embodiments, continuing to refer toFigure 22 and Figure 26 The platform portion 41 can abut against the outer peripheral surface of the collar 30, and the plate surface of the end plate 44 is perpendicular to the axis of the collar 30. The end plate 44 can be formed by bending the platform portion 41.

[0254] In some embodiments, the fixing member 40 may include a plugging portion 45. The plugging portion 45 is connected to the platform portion 41. The plugging portion 45 is plugged into the fan 22 to restrict the rotation of the plugging portion 45 relative to the fan 22.

[0255] In some embodiments, referring to Figure 22 , the plugging portion 45 is formed by extending forward from the end of the platform portion 41. A plugging groove 39 is provided on the middle plate 221, and the plugging groove 39 can be formed by recessing forward from the rear end surface of the middle plate 221. The plugging portion 45 is plugged into the plugging groove 39 from the rear to the front.

[0256] Due to the cooperation between the plugging portion 45 and the plugging groove 39, it is ensured that the fixing member 40 can remain stationary relative to the fan 22.

[0257] In some embodiments, referring to Figure 23 and Figure 24 , the plugging groove 39 is provided on the side wall of the collar 30. The plugging groove 39 can be formed by recessing from the outer side surface of the collar 30 towards the direction (downward) close to the through portion 30a.

[0258] Referring to Figure 27 , the plugging portion 45 can be formed by extending downward from the platform portion 41. The plugging portion 45 is plugged into the plugging groove 39 from top to bottom.

[0259] The cooperation between the plugging portion 45 and the plugging groove 39 can restrict the axial movement of the fixing member 40 relative to the fan 22 and can also restrict the rotation of the fixing member 40 relative to the fan 22.

[0260] In some embodiments, the plugging portion 45 is connected to the side of the platform portion 41 away from the end plate 44. The end plate 44 is located at the rear side of the platform portion 41, and the plugging portion 45 is located at the front side of the platform portion 41.

[0261] The plugging portion 45 is formed by bending downward from the front end of the platform portion 41.

[0262] In some embodiments, with reference to Figure 26 and Figure 27 , the collar 30 is provided with a first plugging groove surface 391 and a second plugging groove surface 392 that enclose the plugging groove 39. The first plugging groove surface 391 and the second plugging groove surface 392 are oppositely arranged, and the arrangement direction of the two is perpendicular to the front-rear direction.

[0263] The plugging portion 45 has a first limiting surface 451. In the assembled state, the first limiting surface 451 faces the first plugging groove surface 391.

[0264] The insertion part 45 has a second limiting surface 452. In the assembled state, the second limiting surface 452 faces the second insertion groove surface 392.

[0265] When the first limiting surface 451 abuts against the first insertion groove surface 391, the rotation of the fixing member 40 relative to the fan 22 along the first direction can be restricted.

[0266] When the second limiting surface 452 abuts against the second insertion groove surface 392, the rotation of the fixing member 40 relative to the fan 22 in the direction opposite to the first direction can be restricted.

[0267] In some embodiments, a third insertion groove surface 393 surrounding the insertion groove 39 is provided on the collar 30. The third insertion groove surface 393 is located on the front side of the insertion groove 39, which is also the side away from the avoidance part.

[0268] The insertion part 45 includes a third limiting surface 453, and the third limiting surface 453 is the front side surface of the insertion part 45.

[0269] In the present application, the fastening screw 25 abuts against the drive shaft 230, generating a downward extrusion force on the drive shaft 230. The drive shaft 230 will give the fastening screw 25 an upward reaction force. Due to the frictional force between the third limiting surface 453 and the third insertion groove surface 393, and the limitation between the limiting hole 441 on the fixing member 40 and the drive shaft 230, the radial movement of the fixing member 40 away from the drive shaft 230 can be avoided, and thus the fan 22 can be effectively fixed on the drive shaft 230.

[0270] In some embodiments, referring to Figure 27 , the fixing member 40 may include a limiting part 46. The limiting part 46 is connected to the end plate 44.

[0271] The limiting part 46 is perpendicularly connected to the end plate 44. Both the limiting part 46 and the platform part 41 extend from the end plate 44 towards the direction close to the collar 30. A limiting groove 461 is provided on the limiting part 46.

[0272] Combined with Figure 24 , a limiting rib wall 382 is provided on the collar 30. In the assembled state, the limiting rib wall 382 is inserted into the limiting groove 461 of the limiting part 46.

[0273] In the present application, through the cooperation between the limiting part 46 and the limiting rib wall 382, the lower end of the fixing member 40 can be limited together with the collar 30, avoiding the movement of the lower end of the fixing member 40 relative to the collar 30.

[0274] In some embodiments, referring to Figure 28 , taking the plane Lp passing through the center of the limiting hole 441 and parallel to the platform part 41 as a reference, the limiting part 46 and the platform part 41 are respectively located on both sides of the plane Lp.

[0275] That is to say, the platform part 41 is located on the upper side of the surface Lp, and the limiting part 46 is located on the lower side of the surface Lp.

[0276] Referring to Figure 29 , the limiting part 46 has a first groove side surface 462 and a second groove side surface 463. The first groove side surface 462 and the second groove side surface 463 are opposite to each other, and the space between the two forms a limiting groove 461.

[0277] When projected onto a plane perpendicular to the axis of the limiting hole 441, a diameter of the limiting hole 441 is located between the first groove side surface 462 and the second groove side surface 463.

[0278] In some embodiments, the limiting part 46 is connected to one end of the end plate 44 away from the platform part 41. The limiting groove 461 penetrates the limiting part 46 in the up-down direction. One end of the limiting groove 461 away from the end plate 44 is open.

[0279] Referring to Figure 26 , the limiting rib wall 382 is located on the lower side of the penetrating part 30a. When projected onto a plane perpendicular to the axis of the collar 30, the diameter of the collar 30 perpendicular to the platform part 41 passes through the limiting rib wall 382.

[0280] In some embodiments, referring to Figure 25 and Figure 28 , the distance from the rear end face of the collar 30 to the rear side edge of the insertion slot 39 is Le1. The distance from the upper end plate 44 of the fixing member 40 to the insertion part 45 is Lf1. Le1≤Lf1 can ensure that the insertion part 45 can be inserted into the insertion slot 39.

[0281] In some embodiments, referring to Figure 25 and Figure 28 , the width of the insertion slot 39 in the front-rear direction is Le2. The thickness of the insertion part 45 on the fixing member 40 in the front-rear direction is Lf2. Lf2<Le2 can ensure that the insertion part 45 can be inserted into the insertion slot 39.

[0282] Le2≤Lf2 + 1mm, the fitting clearance between the insertion part 45 and the insertion slot 39 in the front-rear direction is relatively small, ensuring the limiting effect of the two and avoiding the problem that the fixing member 40 axially moves relative to the fan 22 when the clearance is too large.

[0283] In some embodiments, referring to Figure 26 and Figure 28 , on the collar 30, the maximum distance from the first plane 3421 to the edge of the penetrating part 30a is Le3; the maximum distance from the side surface of the platform part 41 near the limiting hole 441 to the edge of the limiting hole 441 is Lf3. Le3≤Lf3 can ensure that the platform part 41 can be installed outside the first plane 3421 and the drive shaft 230 can pass through the limiting hole 441 of the fixing member 40.

[0284] Lf3 ≤ Le3 + 1 mm, so that the lower part of the circular side surface of the fixing member 40 that forms the limiting hole 441 can abut against the drive shaft 230, restricting the upward movement of the fixing member 40, thereby ensuring that the fastening screw 25 can tightly press against the drive shaft 230.

[0285] In some embodiments, referring to Figure 26 and Figure 29 , the length of the insertion slot 39 is Le4, and the length of the insertion portion 45 is Lf4. Lf4 < Le4, which can ensure that the insertion portion 45 can be inserted into the insertion slot 39.

[0286] Le4 ≤ Lf4 + 1 mm, and the fitting clearance between the insertion portion 45 and the insertion slot 39 in the length direction is relatively small, ensuring the limiting effect of the two and avoiding the problem that the fixing member 40 rotates relative to the fan 22 when the clearance is too large.

[0287] In some embodiments, referring to Figure 24 , the platform portion 41 of the fixing member 40 is located in the spaced space between the first limiting rib 2241 and the second limiting rib 2242.

[0288] In some embodiments, along the installation direction of the fixing member 40 towards the collar 30, that is, from the rear to the front, the distance between the two side surfaces of the platform portion 41 that are arranged in the same direction as the two limiting ribs 224 gradually decreases, so that the platform portion 41 presents a structure with a narrow front end and a wide rear end. In this way, it is beneficial for the platform portion 41 to be installed between the two limiting ribs 224.

[0289] In some embodiments, the platform portion 41 has a first inclined surface 414 and a second inclined surface 415. In the assembled state, the first inclined surface 414 faces the first limiting rib 2241, and the second inclined surface 415 faces the second limiting rib 2242.

[0290] From the rear to the front, the first inclined surface 414 and the second inclined surface 415 incline towards each other.

[0291] In some embodiments, referring to Figure 29 , the insertion portion 45 and the edge of the platform portion 41 form a stepped shape. The minimum distance between the first inclined surface 414 and the second inclined surface 415 is Lf5. Lf4 < Lf5.

[0292] Lf4 > (1 / 2)Lf5, so that it can ensure that the fitting length between the insertion portion 45 and the insertion slot 39 is relatively large, ensuring the limiting effect when the two are fitted.

[0293] In some embodiments, in the assembled state, there is a spaced distance between the limiting portion 46 and the inner ring portion 35, which is used to ensure that the limiting portion 46 does not interfere with the collar 30 when the fixing member 40 is installed on the collar 30.

[0294] In some embodiments, with reference to Figure 23 , in the assembled state, the depth that the insertion part 45 penetrates into the insertion slot 39 is Lf6. In the direction perpendicular to the platform part 41 (the up-and-down direction), the minimum distance from the limiting part 46 to the inner ring part 35 is Lf7, and Lf7 > Lf6. In this way, before the fixing part 40 is installed on the collar 30 and the insertion part 45 is inserted into the insertion slot 39, the limiting part 46 will not interfere with the inner ring part 35, so as to ensure that the fixing part 40 can be installed on the collar 30.

[0295] With reference to Figure 23 , the fan 22 can be installed on the drive shaft 230 in the following manner: First, fix the fixing part 40 on the fan 22, and then pass the through part 30a in the middle of the fan 22 through the drive shaft 230 so that the fan 22 is in the required position on the drive shaft 230. The screwdriver enters from the avoidance hole 2221 of the fan 22, and screws the fastening screw 25 into the installation hole 410 on the fixing part 40 to effectively fix the fan 22 on the drive shaft 230.

[0296] With reference to Figures 30 to 35 , the present application also provides a structural form for connecting the fixing part 40 and the fan 22:

[0297] In some embodiments, the fixing part 40 is connected to the side wall of the collar 30. The fixing part 40 is provided with a threaded installation hole 410. The fastening screw 25 is screwed into the installation hole 410 of the fixing part 40.

[0298] In some embodiments, with reference to Figure 30 , the fixing part 40 includes a first connecting part 47 and a second connecting part 48. The first connecting part 47 is connected to one end of the second connecting part 48 far from the drive shaft 230. The second connecting part 48 is connected to one end of the first connecting part 47 close to the drive shaft 230. A stepped shape is formed at the connection between the first connecting part 47 and the second connecting part 48. The installation hole 410 penetrates through the first connecting part 47 and the second connecting part 48.

[0299] In some embodiments, when projected onto a plane perpendicular to the axis of the fixing part 40, the second connecting part 48 is located within the outer contour line of the first connecting part 47.

[0300] A stepped fixing hole 321 is provided on the side wall of the collar 30. The fixing part 40 is connected in the fixing hole 321. The fixing part 40 can be installed in the fixing hole 321 by means of bonding.

[0301] In the present application, by setting the fixing member 40 in a stepped shape, the installation and positioning of the fixing member 40 on the collar 30 can be achieved, and then the fixing member 40 can be connected to the collar 30 by means such as bonding, avoiding the problem of difficulty in placing nuts in the mold when embedding nuts in the fan in the prior art.

[0302] In some embodiments, referring to Figures 31 to 34 , when projected onto a plane perpendicular to the axis of the fixing member 40, the first connecting portion 47 is located within the outer contour line of the second connecting portion 48, and the outer contour line of the second connecting portion 48 is located outside the first connecting portion 47.

[0303] During the process of screwing the fastening screw 25 into the mounting hole 410, the fixing member 40 will be subjected to a force in the direction away from the drive shaft 230. In the present application, by setting the outer contour of the second connecting portion 48 to be larger, due to the blocking effect of the stepped surface at the connection between the first connecting portion 47 and the second connecting portion 48 against the collar 30, the fixing member 40 can be prevented from disengaging from the collar 30.

[0304] In some embodiments, the fixing hole 321 on the collar 30 communicates with the through portion 30a, and the fixing member 40 can be installed from the through portion 30a into the fixing hole 321.

[0305] In some embodiments, referring to Figure 32 and Figure 35 , the collar 30 is provided with a mounting cavity 31, and the mounting cavity 31 is formed by the end face of the collar 30 being recessed inward along the axis.

[0306] Among the side walls of the collar 30 that enclose the mounting cavity 31, the side wall far from the through portion 30a is the mounting wall 32. The mounting wall 32 is provided with a through fixing hole 321, and the fixing hole 321 communicates with the mounting cavity 31. The fixing member 40 can be installed from the mounting cavity 31 to the fixing hole 321.

[0307] The lower end of the mounting cavity 31 communicates with the through portion 30a, and the lower end of the fixing hole 321 communicates with the mounting cavity 31.

[0308] Combining Figure 32 and Figure 34 , the first connecting portion 47 is installed in the fixing hole 321, and the second connecting portion 48 is located in the mounting cavity 31.

[0309] Due to the blocking effect of the mounting wall 32 on the second connecting portion 48, the upward disengagement of the fixing member 40 from the collar 30 can be restricted.

[0310] Specifically, the second connecting portion 48 is connected to the lower end of the first connecting portion 47. The upper side surface of the second connecting portion 48 abuts against the lower side surface of the mounting wall 32.

[0311] In some embodiments, referring to Figure 32, the side of the mounting wall 32 that encloses the mounting cavity 31 is the blocking surface 322. On the premise that the outer side surface of the mounting wall 32 remains unchanged, compared with the case where the blocking surface 322 is an arc surface, when the blocking surface 322 is a plane, the thickness of the mounting wall 32 can be increased, the axial length of the fixing hole 321 can be increased, so that the mating area between the first connecting portion 47 and the fixing hole 321 can be increased, and thus the connection firmness of the fixing member 40 on the mounting wall 32 can be improved.

[0312] In some embodiments, the outer side surface of the mounting wall 32 is a plane, which is beneficial to the positioning and machining of the fixing hole 321 thereon.

[0313] In some embodiments, in the assembled state, the axis of the mounting hole 410 on the fixing member 40 is perpendicular to the axis of the collar 30.

[0314] The axis of the mounting hole 410 intersects the axis of the collar 30 so that after the fastening screw 25 is installed in the mounting hole 410, it can press the drive shaft 230 radially.

[0315] In some embodiments, referring to Figure 32 and Figure 33 , the contour of the fixing hole 321 in the direction perpendicular to its axis is non-circular. The outer shape of the first connecting portion 47 corresponds to the shape of the fixing hole 321, so as to prevent the fixing member 40 from rotating relative to the fixing hole 321 when the fastening screw 25 is tightened.

[0316] The cross-section of the first connecting portion 47 can be a polygon. For example, the cross-section of the first connecting portion 47 can be a quadrilateral or a hexagon. Here, the cross-section refers to the section obtained by intercepting the first connecting portion 47 with a plane perpendicular to the axis of the fixing member 40.

[0317] In some embodiments, the outer shape of the second connecting portion 48 is not limited and can be cylindrical, which is relatively easy to machine. In addition, when installing the fixing member 40, the direction of the second connecting portion 48 needs to be adjusted so that the first connecting portion 47 can be aligned with the fixing hole 321. Therefore, by setting the second connecting portion 48 to be cylindrical, the first connecting portion 47 can be aligned and installed into the fixing hole 321 by rotating the second connecting portion 48.

[0318] In some embodiments, referring to Figure 32 and Figure 35 , the second connecting portion 48 can be located in the recess 30c.

[0319] In some embodiments, a notch 351 is provided on the inner ring portion 35. The notch 351 communicates the through portion 30a with the recess 30c.

[0320] The portion of the recess 30c between the notch 351 and the mounting wall 32 and the notch 351 form the mounting cavity 31.

[0321] In some embodiments, a retaining rib 384 is provided on the collar 30. The retaining rib 384 is connected between the mounting wall 32 and the inner ring portion 35.

[0322] There are two retaining ribs 384 arranged at intervals. An installation cavity 31 is formed between the two retaining ribs 384 and the mounting wall 32.

[0323] In addition to forming the installation cavity 31, the retaining rib 384 can also increase the structural strength of the collar 30.

[0324] In some embodiments, one end of the retaining rib 384 is connected to the edge of the notch 351, and the other end of the retaining rib 384 is connected to the mounting wall 32.

[0325] In some embodiments, the retaining rib 384 is perpendicularly connected to the mounting wall 32.

[0326] In some embodiments, the retaining rib 384 is tangentially connected to the arc surface of the inner ring portion 35.

[0327] In some embodiments, the second reinforcing rib 225 connected to the mounting wall 32 can be perpendicular to the mounting wall 32.

[0328] In some embodiments, referring to Figure 34 , along the axis direction of the fan 22, the through portion 30a can be divided into a first through portion and a second through portion, where the first through portion is the part of the through portion 30a with the notch 351; the second through portion is the part of the through portion 30a with a complete circle, and the second through portion is the part of the through portion 30a without the notch 351.

[0329] Wherein, the axial length of the second through portion is L1, and L1≥5mm. In this way, the fan 22 can be prevented from shaking relative to the drive shaft 230, and the stability of the connection of the fan 22 on the drive shaft 230 can be ensured.

[0330] If L1<5mm, then the axial mating length between the second through portion and the drive shaft 230 is relatively short, and the fan 22 is likely to shake.

[0331] In some embodiments, in the axial direction of the fixing member 40, the length of the first connecting portion 47 located in the fixing hole 321 is H1, and H1≥1.5mm. In this way, the structural strength at the mounting wall 32 can be ensured, and the problem of fracture due to stress at this part can be avoided.

[0332] In addition, H1 is the connection length between the first connecting portion 47 and the collar 30. If H1<1.5mm, the connection length is relatively short, which will greatly affect the connection reliability and stability of the fixing member 40 on the collar 30. Therefore, by setting H1≥1.5mm, the reliable connection of the fixing member 40 on the collar 30 can be ensured.

[0333] In some embodiments, the diameter of the through portion 30a is D1, and the distance from the axis of the through portion 30a to the fixing member 40 is L2, where L2 > (1 / 2)*D1. In this way, it can be ensured that in the assembled state, the second connecting portion 48 will not interfere with the drive shaft 230.

[0334] In some embodiments, referring to Figure 36 and Figure 37 , when projected onto a plane perpendicular to the axis of the collar 30, the contour line of the through portion 30a is Ls.

[0335] The distance from the mounting wall 32 to Ls is L3, and the maximum thickness of the second connecting portion 48 is L4. L3 > L4. In this way, it can be ensured that in the assembled state, the second connecting portion 48 will not interfere with the drive shaft 230.

[0336] Referring to Figures 38 to 46 , the present application also provides a connection form between the drive shaft 230 and the fan 22:

[0337] In some embodiments, the fan assembly 20 includes a limiting structure provided on the drive shaft 230 for blocking the axial movement of the fan 22 relative to the drive shaft 230.

[0338] The limiting structure includes a first limiting structure and a second limiting structure. The first limiting structure and the second limiting structure are respectively located on both sides of the axial direction of the collar 30 to clamp the fan 22 on the drive shaft 230. The first limiting structure and the second limiting structure can achieve axial limiting of the fan 22.

[0339] In some embodiments, referring to Figure 41 , an anti-rotation plane 2331 is provided on the drive shaft 230. For the convenience of description, the shaft section of the drive shaft 230 provided with the anti-rotation plane 2331 is referred to as the anti-rotation shaft section 233 in the present application.

[0340] At least a part of the through portion 30a is adapted to the outer shape of the anti-rotation shaft section 233. Due to the setting of the anti-rotation plane 2331, the drive shaft 230 can be prevented from rotating relative to the fan 22, ensuring that the drive shaft 230 can drive the fan 22 to rotate together.

[0341] In this embodiment, the fan 22 is limited on the drive shaft 230 by the first limiting structure and the second limiting structure to prevent the fan 22 from axially moving relative to the drive shaft 230. The cooperation between the through portion 30a of the fan 22 and the anti-rotation shaft section 233 restricts the rotation of the drive shaft 230 relative to the fan 22, thereby realizing the connection between the fan 22 and the drive shaft 230. Compared with the problems of complex structure and high cost caused by connecting the fan 22 and the drive shaft 230 through a shaft sleeve in the prior art, the connection structure of the present application is simpler and has a lower cost.

[0342] In some embodiments, referring to Figure 42 , the fan assembly 20 may include a fixing member 40. The fixing member 40 is connected to the axial end of the collar 30.

[0343] In some embodiments, a fixing member 40 is connected to one end of the collar 30.

[0344] In some embodiments, fixing members 40 are respectively connected to both ends of the collar 30.

[0345] In some embodiments, the fixing member 40 is sleeved on the drive shaft 230 and is limited on the collar 30.

[0346] In some embodiments, the fixing member 40 includes an end plate 44. A through limiting hole 441 is provided on the end plate 44 for the drive shaft 230 to pass through. The end plate 44 abuts against one axial end of the collar 30.

[0347] The shape of the limiting hole 441 corresponds to the shape of the anti-rotation shaft section 233. Exemplarily, an anti-rotation plane 2331 is provided on the anti-rotation shaft section 233, the anti-rotation shaft section 233 is D-shaped, and the limiting hole 441 is a D-shaped hole.

[0348] Multiple anti-rotation planes 2331 may also be provided on the anti-rotation shaft section 233. As long as the anti-rotation shaft section 233 is non-circular, it can achieve the anti-rotation effect.

[0349] The end plate 44 of the fixing member 40 is installed on the anti-rotation shaft section 233 of the drive shaft 230, so that the drive shaft 230 can drive the fixing member 40 to rotate together. And since the fixing member 40 is connected to the collar 30 of the fan 22, the drive shaft 230 can drive the fan 22 to rotate together through the fixing member 40.

[0350] Since the limiting hole 441 cooperating with the anti-rotation shaft section 233 is provided on the fixing member 40, the through portion 30a of the collar 30 can be a round hole.

[0351] The through portion 30a being a round hole can increase the adaptation range of the fan 22: the fan 22 can be installed on both the anti-rotation shaft section 233 of the drive shaft 230 and the cylindrical shaft section of the drive shaft 230.

[0352] In addition, the setting of the fixing member 40 can separate the collar 30 of the fan 22 from the limiting structure, avoiding the problem that the collar 30 is easily worn during long-term use when the limiting structure is in direct contact with the collar 30.

[0353] In some embodiments, the fixing member 40 may include a limiting portion 46, and the limiting portion 46 is connected to the edge of the end plate 44.

[0354] The limiting part 46 is angularly connected to the end plate 44. The limiting part 46 is perpendicularly connected to the end plate 44.

[0355] The limiting part 46 is inserted into the fan 22 to achieve radial limitation between the fixing member 40 and the fan 22. The limiting structure axially limits the fixing member 40 and the fan 22.

[0356] In some embodiments, referring to Figure 40 , a recessed part 30d is provided on the collar 30. The recessed part 30d is formed by inward depression from the end face of the collar 30. The limiting part 46 of the fixing member 40 is inserted into the recessed part 30d.

[0357] In some embodiments, referring to Figure 40 and Figure 42 , there are multiple limiting parts 46, and the multiple limiting parts 46 are evenly distributed along the outer periphery of the end plate 44; multiple recessed parts 30d are arranged on the outer periphery of the through part 30a. Exemplarily, in the current view, both the limiting part 46 and the recessed part 30d have four.

[0358] In some embodiments, referring to Figure 43 and Figure 44 , a limiting groove 461 is provided in the middle of the limiting part 46. The limiting groove 461 cooperates with the second reinforcing rib 225 to achieve radial limitation between the limiting part 46 and the fan 22.

[0359] The limiting groove 461 penetrates the limiting part 46 in the thickness direction of the limiting part 46. The limiting groove 461 is open at the free end of the limiting part 46.

[0360] In some embodiments, the limiting part 46 is separated into two limiting claws 462 by the limiting groove 461. In the assembled state, the two limiting claws 462 are respectively located on both sides of the second reinforcing rib 225.

[0361] When the drive shaft 230 drives the fixing member 40 to rotate, the limiting claw 462 pushes the second reinforcing rib 225 to rotate together.

[0362] In some embodiments, when the limiting part 46 is installed on the second reinforcing rib 225, the limiting part 46 contacts the outer peripheral surface of the collar 30, which can make the structure of the fixing member 40 and the collar 30 relatively compact. In addition, the collar 30 can also provide a supporting force for the limiting part 46 to prevent deformation of the limiting part 46.

[0363] In some embodiments, the limiting part 46 is in the shape of a rectangular parallelepiped plate and can be formed by bending the edge of the end plate 44.

[0364] In some embodiments, the plane on the end plate 44 that encloses the limiting hole 441 is parallel to at least one limiting part 46.

[0365] In some embodiments, the collar 30 is cylindrical, and the end plate 44 also has a circular shape. In the projection of the end face of the collar 30, the end plate 44 does not extend beyond the outer contour line of the collar 30.

[0366] In some embodiments, the axial mating length between the limiting portion 46 and the fan 22 is not less than 2 mm.

[0367] Referring to Figure 42 , in the embodiment where the limiting portion 46 is inserted into the recessed portion 30d, the axial length of the limiting portion 46 is W, and W≥2 mm, which can ensure effective limiting under the cooperation of the limiting portion 46 and the recessed portion 30d. If W<2 mm, then the length of the limiting portion 46 extending into the recessed portion 30d is relatively short, and the limiting portion 46 is easily disengaged from the recessed portion 30d.

[0368] In the embodiment where the limiting portion 46 cooperates with the second reinforcing rib 225, the axial mating length between the second reinforcing rib 225 and the limiting groove 461 is L6. L6≥2 mm, which can ensure effective limiting under the cooperation of the limiting portion 46 and the second reinforcing rib 225. If L6<2 mm, then the limiting portion 46 is easily disengaged from the second reinforcing rib 225.

[0369] In some embodiments, referring to Figure 42 , the width of the limiting portion 46 is H, and H≥2 mm, which can ensure the structural strength of the limiting portion 46. If H<2 mm, then the limiting portion 46 is relatively thin and is prone to breakage during long-term use.

[0370] In some embodiments, Tb≤4 mm. Since no threaded holes need to be provided on the fixing member 40 in this embodiment, the thickness of the fixing member 40 can be thinner.

[0371] In some embodiments, referring to Figure 45 and Figure 46 , the first limiting structure is closer to the motor 23 than the second limiting structure. The first limiting structure may be the second stepped surface 234 provided on the drive shaft 230. The outer diameter of the portion of the drive shaft 230 that cooperates with the fan 22 is smaller than the outer diameter of the main body of the drive shaft 230 to form the second stepped surface 234 on the drive shaft 230.

[0372] One axial end of the collar 30 abuts against the second stepped surface 234 to block the movement of the fan 22.

[0373] In some embodiments, referring to Figure 38 and Figure 41 , the first limiting structure is the snap ring 27 connected to the drive shaft 230.

[0374] A clamping groove 235 is provided on the drive shaft 230, and the snap ring 27 is stuck at the clamping groove 235. One axial end of the shaft collar 30 abuts against the snap ring 27 to block the movement of the fan 22. The clamping groove 235 may be an annular groove provided on the outer periphery of the drive shaft 230.

[0375] In some embodiments, the second limiting structure may be a snap ring 27 connected to the drive shaft 230.

[0376] Exemplarily, the first limiting structure is the second step surface 234, and the second limiting structure is the snap ring 27.

[0377] Exemplarily, the first limiting structure is the snap ring 27, and the second limiting structure is the snap ring 27.

[0378] The limiting structures in the above two examples are applicable to the fan assembly 20 having two fans 22 and applicable to the fan assembly 20 having three or more fans 22.

[0379] That is to say, the structural form in which the first limiting structure is the second step surface 234 or the snap ring 27 and the second limiting structure is the snap ring 27 is applicable to the case where the fan 22 is connected to the middle of the axial direction of the drive shaft 230 and applicable to the case where the fan 22 is close to the end of the drive shaft 230.

[0380] In some embodiments, referring to Figure 46 , when the fan 22 is close to the end of the drive shaft 230, the second limiting structure may be a nut 28. The nut 28 is screwed onto the drive shaft 230 to block the axial movement of the fan 22.

[0381] In some embodiments, the nut 28 may be a national standard nut or a special nut. The shape of the special nut is different from that of the national standard nut. When the nut 28 is screwed onto the drive shaft 230, it can clamp the fan 22 together with the first limiting structure.

[0382] In some embodiments, referring to Figure 45 , the part of the drive shaft 230 that cooperates with the nut 28 is a threaded shaft section 236. The outer diameter of the threaded shaft section 236 is smaller than the outer diameter of the anti-rotation shaft section 233. Since the threaded shaft section 236 is thinner, a nut 28 with a small size specification can be selected, thus avoiding the problem of the nut 28 being large and heavy.

[0383] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0384] For the sake of convenience in explanation, the above description has been made in connection with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. A fan assembly, characterized in that: include: a motor connected to a drive shaft; Fan, including: mid-game; A plurality of blades are arranged along the outer circumference of the middle plate; A shaft ring connected to the middle of the middle disk and extending along the axial direction of the fan, wherein the shaft ring is provided with a through portion for the driving shaft to pass through; a fixing member connected to the side wall of the collar; A fastener is threadedly connected to the fixing member, and an end of the fastener abuts against the driving shaft to tighten the driving shaft.

2. The fan assembly according to claim 1, characterized in that: The collar comprises: An outer ring portion, comprising circular arc segments and flat plate segments connected to each other; An inner ring portion is arranged inside the outer ring portion, and the inner portion of the inner ring portion forms the through portion; An escape portion extending from the outer side surface of the flat plate segment to the through portion for the fastener to pass through; The fixing member comprises: a platform portion connected to the flat plate segment, and a mounting hole is provided on the platform portion; The fastener is passed through the mounting hole and the avoidance portion.

3. The fan assembly according to claim 2, characterized in that: The platform portion abuts against the outer side of the flat plate section; The fixing member also includes: A claw abuts against the inner side of the flat plate segment; The connecting portion connects the platform portion and the connecting portion.

4. The fan assembly according to claim 2, characterized in that: The fixing member also includes: An end plate connected to the platform portion, the end plate being passed through the drive shaft; The outer ring part is provided with a mounting groove for the platform part to be inserted, and the mounting groove is formed by the end surface of the shaft ring being recessed inwardly.

5. The fan assembly according to claim 4, characterized in that: The fan is provided with a limiting rib portion, and the limiting rib portion is connected to the outside of the outer ring portion; or the limiting rib portion is connected between the outer ring portion and the inner ring portion; The fixing member further includes: a limiting portion connected to the end plate, wherein the limiting portion abuts against a side of the limiting rib portion that is away from the mounting groove.

6. The fan assembly according to claim 2, characterized in that: The fixing member also includes: An end plate connected to the platform portion, the end plate being passed through the drive shaft; A plug-in portion connected to a side of the platform portion away from the end plate; The outer ring portion is provided with an inserting groove for the inserting portion to be inserted into, and the inserting groove is formed by the outer side surface of the outer ring portion being recessed inwardly.

7. The fan assembly according to claim 6, characterized in that: The shaft ring is provided with a limiting rib wall connected between the outer ring portion and the inner ring portion; The fixing member further comprises: a limiting portion connected to an end of the end plate away from the platform portion, the limiting portion being provided with a limiting groove, and the limiting groove being plug-fitted with the limiting rib wall.

8. The fan assembly according to claim 1, characterized in that: The fixing member is connected to the side wall of the collar; The fixing member comprises: a first connecting portion; A second connecting portion, connected to an end of the first connecting portion close to the driving shaft, wherein a connection between the second connecting portion and the first connecting portion forms a step shape; The mounting hole passes through the first connecting portion and the second connecting portion and is used for threading the fastener.

9. The fan assembly according to any one of claims 1 to 8, characterized in that: The fan assembly is a centrifugal fan.

10. A duct machine, characterized in that: include: A shell body, on which an air inlet and an air outlet are provided; a heat exchanger, disposed in the housing, for exchanging heat with air passing therethrough; The fan assembly according to any one of claims 1 to 9 is used to drive air to flow from the air inlet to the heat exchanger and then blown out from the air supply port.

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