Blower motor

Abstract

The utility model discloses an air blower motor, which comprises a motor module and an impeller rotationally connected with the motor module, the impeller comprises an impeller support and a plurality of blades arranged around the impeller support, and each blade comprises an air inlet part, a supporting part, an air guide part and an air outlet part which are sequentially connected from inside to outside; an inner bending angle is formed on the first side wall, actively receiving airflow, of the blade; the inner bending angles of the blades are gradually reduced and then gradually increased from the air inlet part to the air outlet part; and the thickness of the blades is gradually increased, then gradually reduced and then gradually increased from the air inlet part to the air outlet part. The impeller solves the problems that the impeller is small in air volume and low in blade strength.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially a kind of air blower motor. BACKGROUND

[0002] Air blower is one of the applications of brushless motor, and is widely used in automobile exhaust function. In the model of business car, due to the actual factors such as the length of the air duct is longer, the wind resistance is larger. Initially, only one air blower is set in the front row, and the problem encountered is difficult to deliver large air volume to the middle and rear rows. After improvement, a booster air blower is set in the air duct near the middle row, also known as middle rear air blower. The use of middle rear air blower can relay the air delivered by the front air blower to the last row, and provide appropriate air volume for the middle passengers.

[0003] In the above-mentioned scheme, the problem usually faced in meeting the preset speed requirement is that the impeller blades are prone to deformation or even breakage during high-speed rotation, which cannot meet the required speed requirement. The main reason for this drawback is the thickness and bending angle of the blades. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model provides an air blower motor, which solves the problems of small air volume of impeller and weak blade strength.

[0005] The utility model is implemented by the following technical solutions:

[0006] An air blower motor includes a motor module and an impeller rotatably connected to the motor module. The impeller includes an impeller support and a plurality of blades arranged around the impeller support. Each blade includes an inlet portion, a support portion, a guide portion and an outlet portion connected in sequence from inside to outside.

[0007] An inner bending angle is formed on the first side wall of the blade that actively receives airflow.

[0008] The inner bending angle of the blade gradually decreases from the inlet portion to the outlet portion and then gradually increases.

[0009] The thickness of the blade gradually increases from the inlet portion to the outlet portion, then gradually decreases and then gradually increases.

[0010] Further, an outer bending angle is formed on the second side wall of the blade away from the first side wall. The outer bending angle of the blade gradually increases from the inlet portion to the outlet portion and then gradually decreases.

[0011] Further, the air inlet part has a first bending curvature to collect air flow at the impeller inlet, the inner bending angle of the air inlet part is 124°-123°, and the outer bending angle of the air inlet part is 97°-105° to form the first bending curvature.

[0012] Further, the support part has a second bending curvature to improve the support strength, the inner bending angle of the support part is 123°-121°, and the outer bending angle of the support part is 105°-106° to form the second bending curvature.

[0013] Further, the air guide part has a third bending curvature to guide air flow, the inner bending angle of the air guide part is 121°-122°, and the outer bending angle of the air guide part is 105°-106° to form the third bending curvature.

[0014] Further, the air guide part has the smallest inner bending angle, and the air guide part has the largest outer bending angle.

[0015] Further, the air outlet part has a fourth bending curvature to guide air flow out, the inner bending angle of the air outlet part is 122°-123°, and the outer bending angle of the air outlet part is 106°-105° to form the fourth bending curvature.

[0016] Further, the thickness of the air inlet part is less than the thickness of the support part, the thickness of the support part is greater than the thickness of the air guide part, and the thickness of the air guide part is less than the thickness of the air outlet part.

[0017] Further, the thickness of the air inlet part is 0.89mm-1.03mm, the thickness of the support part is 1.03mm-1.17mm, the thickness of the air guide part is 1.17mm-1.12mm, and the thickness of the air outlet part is 1.12mm-1.29mm.

[0018] Further, the impeller is integrally formed by injection molding, the material is PP, and the odor value level is ≤3.5 level.

[0019] Further, the impeller support has a recessed installation cavity, and the installation cavity is used to install the motor module.

[0020] Further, the installation cavity is recessed inward along the axis from the outer end surface of the impeller support, and the motor module is at least partially or entirely installed in the installation cavity.

[0021] Further, the motor module includes a rotating shaft fixedly connected with the impeller support, the impeller support has a connecting hole formed inside the installation cavity, and the connecting hole is used to connect the rotating shaft.

[0022] Further, the partial projection of the blade in the radial direction at least partially falls on the side wall forming the mounting cavity, so that the airflow can flow through the mounting cavity for heat dissipation.

[0023] Further, the first end of the blade is fixed on the impeller support, and the second end of the blade is fixed on the annular fixing member.

[0024] Further, the projection of the annular fixing member in the axial direction is located outside the impeller support, so that a negative pressure is formed at the hollowed-out end surface to suck out the heat in the motor module.

[0025] Further, the motor module comprises a stator assembly and a rotor assembly in gap cooperation with the stator assembly, and the rotor assembly is fixed on the rotating shaft.

[0026] Further, the stator assembly comprises a plurality of winding stators arranged around and a stator pin electrically connected with the winding stator, and the stator pin is electrically connected with the circuit board along the axial direction.

[0027] Further, the rotor assembly comprises a rotor shell fixed on the rotating shaft and a plurality of rotors arranged on the inner wall of the rotor shell, and the rotors surround the winding stator.

[0028] Further, a sleeve is arranged between the stator assembly and the rotor assembly, the stator assembly is fixed to the outer wall of the sleeve, and the rotor assembly is rotationally connected to the inner wall of the sleeve.

[0029] Further, the sleeve forms a bearing chamber, and a bearing is arranged in the bearing chamber, and the rotating shaft is rotationally connected with the sleeve through the bearing.

[0030] Compared with the prior art, the utility model has the advantages that:

[0031] 1. By designing the thickness and bending angle of the blade, the internal pressure of the air inlet part is close to the external pressure of the air outlet part, so that the airflow in the fan air path flows smoothly and does not appear local speed or pressure imbalance. The improved internal dynamic pressure is greatly improved compared with the previous modification, the internal and external dynamic pressures are close to the constant state, the overall flow characteristics are stable, and there is no phenomenon of local speed or pressure imbalance. The improved flow is more stable than the original fan flow, the overall fluid momentum loss is smaller, and it is more balanced.

[0032] 2. By selecting the impeller material as PP, compared with nylon material, the odor after molding can meet the customer's demand. DETAILED DESCRIPTION

[0033] Figure 1 is a structural schematic view of the air blower motor provided by the embodiment of the utility model.

[0034] Figure 2 is a structural schematic view of the air blower motor provided by the embodiment of the utility model.

[0035] Figure 3 is a sectional view of the air blower motor provided by the embodiment of the utility model.

[0036] Figure 4 is a structural schematic view of the circuit board module in the air blower motor provided by the embodiment of the utility model.

[0037] Figure 5 is an exploded view of the circuit board module in the air blower motor provided by the embodiment of the utility model.

[0038] Figure 6 is a sectional view of the circuit board module in the air blower motor provided by the embodiment of the utility model.

[0039] Figure 7 is a structural schematic view of the end cover in the circuit board module provided by the embodiment of the utility model.

[0040] Figure 8 is a structural schematic view of the base in the circuit board module provided by the embodiment of the utility model.

[0041] Figure 9 is a structural schematic view of the sealing ring of the end cover in the circuit board module provided by the embodiment of the utility model.

[0042] Figure 10 is a structural schematic view of the wiring harness sealing member in the circuit board module provided by the embodiment of the utility model.

[0043] Figure 11 is a partial structural schematic view of the circuit board module provided by the embodiment of the utility model.

[0044] Figure 12 is an internal structural schematic view of the circuit board module provided by the embodiment of the utility model.

[0045] Figure 13 is a structural schematic view of the second sealing member of the circuit board module provided by the embodiment of the utility model.

[0046] Figure 14 is a sectional view of the second sealing member of the circuit board module provided by the embodiment of the utility model.

[0047] Figure 15 is a partial structural exploded view of the air blower motor provided by the embodiment of the utility model.

[0048] Figure 16 is a sectional view of a flange and base connecting part provided by the embodiment of the utility model.

[0049] Figure 17 is a structural schematic view of the vibration damping pad assembled on the flange provided by the embodiment of the utility model.

[0050] Figure 18 is a structural schematic view of the flange provided by the embodiment of the utility model.

[0051] Figure 19 is a structural schematic view of the vibration damping pad provided by the embodiment of the utility model.

[0052] Figure 20 is a top view of the vibration damping pad provided by the embodiment of the utility model.

[0053] Figure 21 is a top view of the impeller provided by the embodiment of the utility model.

[0054] Figure 22 is a structural schematic view of the blade provided by the embodiment of the utility model Figure 1 .

[0055] Figure 23 is a structural schematic view of the blade provided by the embodiment of the utility model Figure 2 .

[0056] Figure 24 is a structural schematic view of the blade provided by the embodiment of the utility model Figure 3 .

[0057] Figure 25 is a structural schematic view of the blade provided by the embodiment of the utility model Figure 4 .

[0058] Figure 26 is a structural schematic view of the blade provided by the embodiment of the utility model Figure 5 .

[0059] Figure 27 is a structural schematic view of the impeller provided by the embodiment of the utility model Figure 5 .

[0060] In the figure:

[0061] 100 circuit board module,

[0062] 101 base, 102 shell, 103 sleeve, 104 first mounting groove, 105 second mounting groove, 106 bottom plate, 107 through hole, 108 side plate, 109 wire harness port, 110 first flange, 111 second flange, 112 connecting portion, 113 support seat, 114 guide column, 115 channel, 116 end cover, 117 first rib, 118 limiting groove, 119 second rib, 120 limiting block, 121 mounting cavity, 122 circuit board, 124 end cover sealing ring, 125 notch, 126 groove, 127 wire harness sealing element, 128 wire harness hole, 129 first groove body, 130 second groove body, 131 guide portion, 132 wire harness, 133 second sealing element, 134 main rod, 135 pin hole, 136 first convex rib, 137 top hat, 138 second convex rib,

[0063] 200 motor module,

[0064] 201 winding stator, 202 stator pin, 203 first bearing, 204 second bearing, 205 rotating shaft, 206 rotor housing, 207 rotor,

[0065] 300 flange, 301 slot hole, 302 flange plate, 303 guard plate, 304 flange hole, 305 apron,

[0066] 400 damping pad, 401 damping pad body, 402 ring groove, 403 via, 404 reinforcing rib, 405 first buffer block, 406 second buffer block,

[0067] 500 locking element, 501 gasket, 502 inner hole, 503 screw, 504 threaded segment, 505 head,

[0068] 600 impeller, 601 impeller support, 602 blade, 603 air inlet portion, 604 support portion, 605 air guide portion, 606 air outlet portion, 607 first end, 608 second end, 609 annular fixing element, 610 mounting cavity, 611 connecting hole. DETAILED DESCRIPTION

[0069] The following is a further non-restrictive detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and the accompanying drawings. In the description of the utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model.

[0070] like Figure 1 As shown, one embodiment of the present invention provides a blower motor for use in an automobile, mounted in the armrest compartment, to assist the front blower in delivering airflow to the rear seat. The blower motor comprises at least a motor module 200, a circuit board module 100, a wiring harness module, and an impeller 600 rotatably connected to the motor module 200. The wiring harness module connects an external power source to the circuit board module 100, the circuit board module 100 connects to the motor module 200 to power it, and the impeller 600 is fixed to the motor module 200 and can rotate driven by the motor module 200.

[0071] See Figures 1-6The circuit board module 100 comprises a base 101, an end cover 116 and a circuit board 122. The base 101 comprises a top-opened shell 102 and a sleeve 103 formed at the bottom of the shell 102. The end cover 116 covers the top of the shell 102, and the mounting cavity 121 is formed between the end cover 116 and the shell 102. The circuit board 122 is arranged in the mounting cavity 121. The motor module 200 comprises a rotating shaft 205, a stator assembly and a rotor assembly which is in clearance fit with the stator assembly and is fixed on the rotating shaft 205. The sleeve 103 is arranged between the stator assembly and the rotor assembly, and the stator assembly is fixed to the outer wall of the sleeve 103, and the rotor assembly is rotatably connected to the inner wall of the sleeve 103. The wiring harness assembly comprises a wiring harness port 109 arranged on the shell 102, and a wiring harness 132 arranged at the wiring harness port 109 and electrically connected to the circuit board 122. The first sealing member comprises an end cover sealing ring 124 and a wiring harness sealing member 127. The end cover sealing ring 124 has two oppositely arranged ends in the circumferential direction, and is sleeved on the shell 102 and is limited in the circumferential and radial directions. The two side walls of the wiring harness sealing member 127 in the circumferential direction are recessed with groove bodies, and the wiring harness sealing member 127 is sleeved on the wiring harness port 109 and is limited in the radial direction. The two opposite ends of the end cover sealing ring 124 in the circumferential direction are embedded in the groove bodies of the wiring harness sealing member 127, and the end cover sealing ring 124 is in abutment with the side walls of the wiring harness sealing member 127 in the circumferential direction, and at least one side wall of the end cover sealing ring 124 is in abutment with the side wall of the wiring harness sealing member 127 in the radial direction. It is also worth noting that the end cover 116 compresses the end cover sealing ring 124 and the wiring harness sealing member 127 in the axial direction, and buckles and abuts the outer side walls of the end cover sealing ring 124 and the wiring harness sealing member 127 in the radial direction, so as to limit the end cover sealing ring 124 and the wiring harness sealing member 127 in the axial and radial directions, respectively. Through the above arrangement, firstly, the end cover sealing ring 124 and the wiring harness sealing member 127 are limited in the radial direction by the shell 102, secondly, the wiring harness sealing member 127 can further limit the end cover sealing ring 124 in the radial direction, and finally, the end cover 116 limits the end cover sealing ring 124 and the wiring harness sealing member 127 in the axial and radial directions, respectively. The structure design is interlocked, especially in the use requirement of small installation space, so that the motor can always maintain the stability of the structure in the vibrating working environment, and the wiring harness and other components can always maintain the stability of the structure when subjected to external force, thereby maintaining the sealing property of the working environment of the circuit board 122, and solving the sealing and waterproof problem of the lead wire.

[0072] The stator assembly comprises a plurality of winding stators 201 arranged around the outer wall of the sleeve 103 and stator pins 202 electrically connected with the winding stators 201, the stator pins 202 are electrically connected with the circuit board 122 through the housing 102 in the axial direction; the sleeve 103 is formed with a bearing chamber, and a bearing is arranged in the bearing chamber; the rotor assembly comprises a rotor shell 206 fixed on the rotating shaft 205 and a plurality of rotors 207 arranged on the inner wall of the rotor shell 206, the rotors 207 surround the winding stators 201, the rotating shaft 205 enters the bearing, and the rotating shaft 205 is rotationally connected with the sleeve 103 through the bearing. The current is conducted to the winding stators 201 through the circuit board 122 and the stator pins 202, the magnetic field generated by the winding stators 201 interacts with the magnetic field of the rotors 207, so as to drive the whole rotor assembly to rotate, and then the rotor assembly drives the impeller 600 to rotate.

[0073] In one possible implementation, referring to Figure 6 , the first mounting groove 104 is arranged in the sleeve 103 in the axial direction, and the first bearing 203 is arranged in the first mounting groove 104; the second mounting groove 105 is arranged in the sleeve 103 in the axial direction, and the second bearing 204 is arranged in the second mounting groove 105; the rotating shaft 205 enters the first bearing 203 and the second bearing 204 and rotationally cooperates with the first bearing 203 and the second bearing 204.

[0074] The impeller 600 comprises an impeller support 601 and a plurality of blades 602 arranged around the impeller support 601, and one end of the rotating shaft 205 extending out of the rotor shell 206 is fixedly connected with the impeller support 601. The number of the blades 602 is multiple, the plurality of blades 602 are arranged in the axial direction and uniformly spaced in the axial direction around the rotating shaft 205, and there is a gap between adjacent two blades for blowing air. In the application, two blower motors are selected in the working process, the impellers 600 of the two blower motors are arranged opposite to each other, and the air inlet direction is perpendicular to the axial direction, so that the impeller can uniformly and powerfully assist the air in the air duct in the case of high-speed rotation.

[0075] As Figure 27As shown, the impeller support 601 is concave with a mounting cavity 610 for mounting the motor module 200, the motor module 200 includes a rotating shaft 205 fixedly connected with the impeller support 601, the impeller support 601 is formed with a connecting hole 611 inside the mounting cavity 610, the connecting hole 611 is used for connecting the rotating shaft 205. In one preferred mode, the mounting cavity 610 is formed by concave inward along the axis of the outer end surface of the impeller support 601, and the motor module 200 is at least partially or entirely mounted in the mounting cavity 610. The blade 602 is partially projected on the side wall of the mounting cavity 610 in the radial direction, so that the airflow can flow through the mounting cavity 610 to dissipate heat. Specifically, during the operation of the motor module 200, the heat generated by the stator and rotor is conducted outward to the inner wall of the mounting cavity 610. During the rotation of the impeller 600, the airflow is sucked from the opening of the impeller 600 and flows out from the gap between the adjacent two blades 602, and the flowing airflow can flow through the outer wall of the mounting cavity 610, thereby dissipating heat and maintaining the stable operation of the motor module 200 during long-term operation.

[0076] The first end 607 of the blade 602 is fixed on the impeller support 601, the second end 608 of the blade 602 is fixed on the annular fixing member 609, and the projection of the annular fixing member 609 in the axial direction is located on the outer side of the impeller support 601, so that the negative pressure is formed in the end face hollow part to suck out the heat in the motor module 200. Specifically, during the rotation of the impeller 600, a small amount of airflow still flows outward in the radial direction at the end face hollow part to form a negative pressure at the end face hollow part, thereby sucking the airflow in the motor module housing and the mounting cavity 610 outward to carry away the heat, thereby continuously dissipating heat and further ensuring the stable operation of the motor module 200.

[0077] The diameter of the impeller 600 of the present application is between 80-90mm.

[0078] As shown, Figure 21-22 Each blade 602 includes an air inlet portion 603, a support portion 604, an air guide portion 605 and an air outlet portion 606 connected in sequence from inside to outside.

[0079] As shown, Figure 23-26 The first side wall of the blade 602 actively receiving the airflow is formed with an inner bending angle, wherein the inner bending angle of the blade 602 gradually decreases first and then gradually increases from the air inlet portion 603 towards the air outlet portion 606, and the air guide portion 605 has the smallest inner bending angle. The second side wall of the blade 602 away from the first side wall is formed with an outer bending angle, wherein the outer bending angle of the blade 602 gradually increases first and then gradually decreases from the air inlet portion 603 towards the air outlet portion 606, and the air guide portion 605 has the largest outer bending angle.

[0080] The air inlet part 603 has a first bending curvature to collect the airflow at the impeller 600 inlet, wherein the inner bending angle a1 of the air inlet part 603 is 124°-123°, and the outer bending angle b1 of the air inlet part 603 is 97°-105° to form the first bending curvature. The support part 604 has a second bending curvature to improve the support strength, wherein the inner bending angle a2 of the support part 604 is 123°-121°, and the outer bending angle b2 of the support part 604 is 105°-106° to form the second bending curvature. The air guide part 605 has a third bending curvature to guide the airflow, wherein the inner bending angle a3 of the air guide part 605 is 121°-122°, and the outer bending angle b3 of the air guide part 605 is 105°-106° to form the third bending curvature. The air outlet part 606 has a fourth bending curvature to guide the airflow out, wherein the inner bending angle a4 of the air outlet part 606 is 122°-123°, and the outer bending angle b4 of the air outlet part 606 is 106°-105° to form the fourth bending curvature. In the embodiment, the inner bending angle a and the outer bending angle b of the blade 602 at different positions are shown in Table 1 below.

[0081] As shown in Figure 22 , the thickness of the blade 602 gradually increases, then gradually decreases, and then gradually increases from the air inlet part 603 to the air outlet part 606, wherein the thickness d1 of the air inlet part 603 is less than the thickness d2 of the support part 604, the thickness d2 of the support part 604 is greater than the thickness d3 of the air guide part 605, and the thickness d3 of the air guide part 605 is less than the thickness d4 of the air outlet part 606. In the embodiment, the thickness d1 of the air inlet part 603 is 0.89mm-1.03mm, the thickness d2 of the support part 604 is 1.03mm-1.17mm, the thickness d3 of the air guide part 605 is 1.17mm-1.12mm, and the thickness d4 of the air outlet part 606 is 1.12mm-1.29mm. In the coordinate system as an example, Figure 22 , Figure 22 In the embodiment, the thickness d of the blade 602 at different positions is shown in Table 1 below.

[0082] Table 1 Thickness, inner bending angle and outer bending angle parameters corresponding to different positions of the blade

[0083] Serial number I1 I2 I3 I4 I5 I6 I7 I8 I9 I10 I11 X 1.84 3 3.76 4.23 4.47 4.56 4.51 4.32 3.96 3.42 2.68 Y -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 Thickness d / mm 1.29 1.16 1.12 1.13 1.17 1.17 1.1 1.03 0.97 0.9 0.89 Inner bending angle a / degree 123 122 121 121 122 122 123 123 124 124 / External bending angle b / degree 105 106 106 106 105 105 105 105 103 97 /

[0084] In the embodiment, the inner bending angle a1 formed by the inner side wall of the air inlet part 603 is 124°, which is designed to have a larger bending curvature and extend smoothly to wrap the airflow radiating outward from the center, thereby reducing the degree of turbulence and turbulent flow. The outer bending angle b1 formed by the outer side wall increases from 97° to 123°, and the angle increases to match the subsequent support part 604, so that the transition connection between the air inlet part 603 and the support part 604 has better arc property.

[0085] In this embodiment, the inner bending angle a2 formed by the inner side wall of the support part 604 is reduced from 124° to 123° and 122°, and the bending curvature is reduced; the outer bending angle b2 formed by the outer side wall maintains at 105°, and the thickness is increased from 1.03 mm to 1.17 mm. The main purpose is to connect the air inlet part 603. Since the air inlet part 603 is designed as a free end, when the airflow flows from the air inlet part 603 to the support part 604, it has a large impact force, and at the same time, it still has an irregular flow direction to the blade 602. In summary, the bending curvature is reduced, which can cooperate with the air inlet part 603 to preliminarily guide the airflow; the thickness is increased, which has a good support strength, so as to effectively ensure the stability of the blade 602 and avoid stress deformation, causing the occurrence of bending, breaking and other disadvantages.

[0086] In this embodiment, the inner bending angle a3 formed by the inner side wall of the air guide part 605 is continuously reduced from 122° to 121° and maintained, and the bending curvature is continuously reduced; the outer bending angle b3 formed by the outer side wall rises to 106°, and the thickness is reduced from 1.17 mm to 1.12 mm; the airflow passing through the air inlet part 603 and the support part 604 has been preliminarily guided, and the airflow is basically in a smooth state. The design of the air guide part at this place reduces the bending curvature to further guide the airflow to make the airflow entering the air outlet part 606 stable and orderly; the thickness is reduced, so that the impact force of the airflow after being preliminarily guided is weakened, and the thinning design can reduce the weight, especially in the case of designing multiple blades, the weight reduction is obvious.

[0087] In this embodiment, the inner bending angle a4 formed by the inner side wall of the air outlet part 606 is increased from 121° to 122° and 123°, and the bending curvature is continuously increased; the outer bending angle b4 formed by the outer side wall decreases to 105°, and the thickness is increased from 1.12 mm to 1.29 mm; the air outlet part 606 aims to guide the smooth airflow into the channel, and also serves as a connecting part, which can be fixedly connected with the outer edge in a circular ring shape, so a certain thickness requirement is needed.

[0088] Through the above structure design of the blade 602 of the impeller 600, the internal pressure of the air inlet part 603 and the external pressure of the air outlet part 606 are close to a balanced state, so that the airflow in the air flow path of the fan is relatively stable, and the local speed or pressure imbalance phenomenon does not occur. The improved internal dynamic pressure is greatly improved compared with that before the modification, the internal and external dynamic pressures are close to a constant state, the overall flow characteristics are relatively stable, and the local speed or pressure imbalance phenomenon does not occur. Moreover, the overall flow of the improved flow is more stable than that of the original fan, the overall fluid momentum loss is smaller, and the flow development is more balanced.

[0089] In this embodiment, the impeller 600 is integrally formed by injection molding, and the material is PP. Compared with nylon material, the odor of the formed product can meet the customer's demand, and the odor value is ≤3.5 level.

[0090] The waterproof of the circuit board 122 of the blower motor is one of the important problems to be solved, and the main purpose is to ensure the absolute sealing of the cavity in which the circuit board 122 is installed relative to the outside, so as to ensure that the circuit board 122 will not fail, short circuit and other phenomena during long-term use. However, due to the need of leading the wire to the outside, it is difficult to solve the waterproof problem. In view of this problem, the utility model embodiment sets a first sealing member between the shell 102 and the end cover 116 to block the gap between the end cover 116 and the shell 102, and sets a second sealing member 133 between the stator pin 202 and the shell 102 to block the gap between the stator pin 202 and the shell 102, so as to construct a relatively closed space between the base 101 and the end cover 116, preventing external water vapor from entering to cause damage to the circuit board 122.

[0091] Please refer to Figure 5-Figure 8 , the shell 102 includes a bottom plate 106 and a side plate 108, the side plate 108 and the sleeve 103 are respectively arranged on the opposite sides of the bottom plate 106, the barrel opening of the sleeve 103 penetrates the bottom plate 106, and the side plate 108 is provided with a wire harness port 109 for the external wire harness 132 to pass through. The first sealing member includes an end cover sealing ring 124 and a wire harness sealing member 127, wherein the cross section of the end cover sealing member is in inverted U shape, the end cover sealing ring 124 is sleeved on the side plate 108 and can wrap the edge of the side plate 108, the wire harness sealing member 127 is sleeved at the wire harness port 109 and can also wrap the edge of the wire harness port 109, and the end cover 116 presses the end cover sealing ring 124 and the wire harness sealing member 127. The wire harness sealing member 127 is provided with a wire harness hole 128, the wire harness hole 128 penetrates the inner side wall and the outer side wall of the wire harness sealing member 127, and the external wire harness 132 is electrically connected with the circuit board 122 after passing through the wire harness hole 128. The diameter of the wire harness hole 128 and the diameter of the wire harness 132 can be the same or slightly smaller, and the wire harness 132 can abut against the hole wall of the wire harness hole 128 when it is inserted into the wire harness hole 128, so as to avoid the gap at the connection between the two and prevent external water vapor from entering the installation cavity 121 from the gap.

[0092] The end cover sealing ring 124 and the wire harness sealing member 127 are both made of rubber material, and can deform themselves when subjected to the extrusion force from the shell 102, the end cover 116 or the wire harness 132, so as to block the gap and play a sealing role. The base 101 is made of aluminum alloy, has the characteristics of small quality and good heat dissipation effect, and has better hardness compared with rubber material, and can ensure that the structure is not deformed under the locking force and the tension of the wire harness.

[0093] In one possible implementation, referring to Figure 8 , the side plate 108 comprises a first flange 110 and a second flange 111 connected with the first flange 110, the second flange 111 is lower than the first flange 110 to form the wire harness port 109 on the side plate 108. The end cover sealing ring 124 has a notch 125 matched with the wire harness port 109, the end cover sealing ring 124 is sleeved on the first flange 110, the notch 125 is coincided with the wire harness port 109, the wire harness sealing element 127 is sleeved on the second flange 111 and connected with the end cover sealing ring 124 at the notch 125. The end cover 116 is axially pressed on the upper end surface of the end cover sealing ring 124 and the wire harness sealing element 127.

[0094] Referring to Figure 9 , the lower end surface of the end cover sealing ring 124 is provided with a groove 126, when the end cover sealing ring 124 is sleeved on the base 101, the first flange 110 is embedded in the groove 126. The groove 126 of the end cover sealing ring 124 and the first flange 110 of the shell 102 are transition fit or interference fit, so that the wall of the first flange 110 abuts against the wall of the groove 126, better realizing sealing, in the case of transition fit, it is more convenient to install. And, the shell 102 can limit the radial and axial directions of the end cover sealing ring 124 respectively, so that the end cover sealing ring 124 can still closely adhere to the surrounding parts when stressed, ensuring good sealing performance in use.

[0095] Referring to Figure 10The lower end surface of the wire harness seal 127 is provided with a first groove 129, and the two opposite side walls of the wire harness seal 127 are provided with a second groove 130, and the two second grooves 130 are located at the two ends of the first groove 129 and communicate with the first groove 129, forming a U-shaped ring groove 402 on the outer periphery of the wire harness seal 127. When the wire harness seal 127 is sleeved on the base 101, the second flange 111 is embedded in the first groove 129, the first groove 129 of the wire harness seal 127 and the first flange 110 are in transition fit or interference fit, the ends of the end cover sealing ring 124 on both sides of the notch 125 are embedded in the second groove 130, and the second groove 130 of the wire harness seal 127 and the ends of the end cover sealing ring 124 are in transition fit or interference fit, and the second groove 130 can wrap the ends of the end cover sealing ring 124 and limit each other in the radial and circumferential directions. The lower end of the wire harness seal 127 is supported by the second flange 111, and the two sides of the wire harness seal 127 are connected and matched with the end cover sealing ring 124 to form a complete ring body, which fills the wire harness port 109 on the shell 102, and the end cover 116 simultaneously compresses the wire harness seal 127 and the end cover sealing ring 124, so that the connection between the end cover 116 and the shell 102 is sealed and connected. During the installation process, the wire harness 132 will usually be subjected to a radial tensile force, and through the mutual limiting mode of the shell 102, the end cover sealing ring 124 and the wire harness seal 127, and by using the material of the shell 102 and the end cover 116 which has better hardness than rubber, the structure at this position can always remain stable, and thus the sealing performance at this position can still remain good during a long period of use.

[0096] In one possible implementation, a guide portion 131 is arranged at the slot opening of the first groove 129, which enlarges the caliber of the slot opening. During the process of sleeving the end cover sealing ring 124 on the first flange 110, the guide portion 131 can make the first flange 110 more easily enter the groove, thereby improving the convenience of installation. In actual application, the guide portion 131 can be a chamfer arranged between the groove wall of the first groove 129 and the lower end surface of the wire harness seal 127.

[0097] In one possible implementation, please refer to Figure 7 A first rib 117 protruding towards the shell 102 is arranged on the end cover 116 at a position corresponding to the end cover sealing ring 124. When the end cover 116 compresses the end cover sealing ring 124, the first rib 117 extrudes the upper end surface of the end cover sealing ring 124. Specifically, since the end cover sealing ring 124 is made of rubber and has the characteristic of being extruded and deformed, when the end cover 116 compresses the end cover sealing ring 124, the first rib 117 will be embedded in the upper surface of the end cover sealing ring 124 to make the contact surface of the two closely fit without gap.

[0098] In one possible implementation, the end cover 116 is further provided with a limiting groove 118 corresponding to the position of the wire harness seal 127, and the upper end of the wire harness seal 127 is embedded in the limiting groove 118. In this embodiment, the wire harness seal 127 is limited not only on three surfaces (the lower end surface and two opposite side surfaces) of the outer periphery of the wire harness seal 127, but also on the upper end of the wire harness seal 127 through the limiting groove 118 on the end cover 116. During the pulling process of the external wire harness 132, the wire harness seal 127 is not prone to turn outward or fall out.

[0099] Further, in order to prevent the wire harness seal 127 from falling out and enhance the stability of the connection of the wire harness seal 127, the end cover 116 is further provided with a limiting block 120 corresponding to the position of the wire harness seal 127, and the limiting block 120 extends towards the shell 102. When the end cover 116 is pressed against the wire harness seal 127, the limiting block 120 is close to or abuts against the outer side wall of the wire harness seal 127 to block the wire harness seal 127 from turning outward under the pulling of the wire harness 132. The wire harness hole 128 on the wire harness seal 127 can be one or more, and the number of the wire harness hole 128 can be consistent with the number of the wire harness 132 to be pulled. Meanwhile, the limiting block 120 is arranged in a staggered manner with the wire harness hole 128 on the wire harness seal 127 to avoid interference between the limiting block 120 and the wire harness 132. In addition, in order to ensure that the wire harness 132 can smoothly pass through the inner wall of the wire harness hole 128, the wire harness hole 128 is arranged on the upper part of the wire harness seal 127, and the wire harness hole 128 is exposed from the upper end surface of the wire harness seal 127, that is, the upper end surface of the wire harness seal 127 forms a gap that communicates with the wire harness hole 128. The gap provides a deformation space for the wire harness seal 127. When the wire harness 132 is arranged in the wire harness hole 128, the wire harness hole 128 is expanded, and the gap is enlarged, so that the resistance of the wire harness 132 passing through the wire harness hole 128 is reduced.

[0100] Optionally, please continue to refer to Figure 7 The groove bottom of the limiting groove 118 is further provided with a second rib 119 protruding towards the shell 102. When the end cover 116 is pressed against the wire harness seal 127, the second rib 119 is pressed until it is embedded in the upper end surface of the wire harness seal 127, so that the two are closely attached without a gap.

[0101] The stator pin 202 needs to pass through the bottom plate 106 and extend into the mounting cavity 121 to be electrically connected with the circuit board 122, so a through hole 107 needs to be formed on the bottom plate 106, and further sealing treatment needs to be performed on the through hole 107 after the stator pin 202 is arranged therein. In this embodiment, the second seal 133 is used to seal the connection between the stator pin and the through hole 107. Please refer to Figure 6The circuit board 122 is fixed on the bottom plate 106, the bottom plate 106 is provided with a through hole 107 corresponding to the stator pin 202, the stator pin 202 passes through the through hole 107 and is electrically connected with the circuit board 122, and the second sealing member 133 is arranged at the through hole 107 to block the gap between the wall of the through hole 107 and the stator pin 202. The second sealing member 133 is made of rubber. In the circuit board locking state, the stator pin 202 is connected with the circuit board and fixed by soldering.

[0102] In one possible implementation, the second sealing member 133 includes a main rod 134, the main rod 134 is provided with a pin hole 135 matched with the shape of the stator pin 202, the stator pin 202 penetrates into the pin hole 135 and is in interference fit with the wall of the pin hole 135, and the pin hole 135 extends along the long axis of the main rod 134. A plurality of first protruding ribs 136 are arranged on the outer wall of the main rod 134 in the axial direction, the first protruding ribs 136 extend in the circumferential direction of the main rod 134, and the first protruding ribs 136 are in interference fit with the wall of the through hole 107, which can facilitate the insertion of the second sealing member 133 while ensuring waterproof and dustproof sealing. It is worth noting that the upper and lower ends of the main rod 134 in the axial direction respectively exceed the end surface of the bottom plate 106.

[0103] The first protruding ribs 136 surround the main rod 134 once or less than once, but the projections of the plurality of first protruding ribs 136 in the axial direction of the main rod 134 form a circular ring. The diameter of the main rod 134 is equal to or slightly smaller than the diameter of the through hole 107, and the diameter of the circular ring formed by the single first protruding rib 136 or the plurality of first protruding ribs 136 is greater than the diameter of the through hole 107. After the second sealing member 133 is installed in the through hole 107, the first protruding rib 136 tightly abuts the hole wall of the through hole 107, blocks the gap between the through hole 107 and the main rod 134, and realizes sealing. In the structure as shown in Figure 13 The main rod 134 is in a columnar structure, the outer wall of the main rod 134 is provided with two first protruding ribs 136, one of the first protruding ribs 136 surrounds the lower part of the main rod 134, and the other first protruding rib 136 surrounds the middle part of the main rod 134, and the diameter of the main rod 134 is equal to or slightly smaller than the diameter of the through hole 107, and the diameter of the first protruding rib 136 is greater than the diameter of the through hole 107.

[0104] Optionally, one end of the main rod 134 is also provided with a top cap 137 abutting the bottom plate 106, the pin hole 135 penetrates the top cap 137, and the radial dimension of the top cap 137 is greater than the radial dimension of the first convex rib 136. After the second sealing element 133 is installed in the through hole 107, the top cap 137 remains in the mounting cavity 121, the lower end surface of the top cap 137 abuts the bottom plate 106, and the upper end surface of the top cap 137 abuts the circuit board 122. During the process of locking the circuit board 122 on the bottom plate 106, the circuit board 122 extrudes the top cap 137, so that the top cap 137 deforms and tightly fits the bottom plate 106 and the circuit board 122, achieving the sealed connection of the two.

[0105] Further, please refer to Figure 6 、 Figure 13 and Figure 14 , the top cap 137 is also provided with a second convex rib 138 on the side facing the circuit board 122, and the second convex rib 138 surrounds the pin hole 135. Since the second sealing element 133 is made of rubber material and has a deformation characteristic, when the circuit board 122 is locked on the bottom plate 106, the circuit board 122 will flatten the second convex rib 138, so that the second convex rib 138 tightly fits the circuit board 122, thereby forming a sealed space between the circuit board 122 and the second convex rib 138, achieving the sealing of the stator pin 202 and preventing water vapor from entering.

[0106] The mounting flange 300 is used as a fixed connecting piece between the air blower and the air conditioner box body. The vibration of the motor of the air blower in the axial direction is easily transmitted to the mounting flange 300 and then to the air conditioner box body, causing a large noise. Moreover, due to the limitation of space structure, the rear-mounted air blower has a size limitation, which is smaller than that of the front-mounted air blower, increasing the difficulty of vibration reduction. Therefore, it is urgent to solve the vibration reduction problem between the motor of the rear-mounted air blower and the mounting flange 300 while meeting the small size structure requirement of the rear-mounted air blower. To this end, the embodiment provides the following technical solutions, which achieve the vibration reduction purpose by arranging a damping pad 400 between the flange 300 and the base 101 of the motor.

[0107] Please refer to Figure 15 and Figure 16The outer periphery of the base 101 is provided with a plurality of connecting portions 112, the blower motor comprises a flange 300 and a connecting assembly provided in one-to-one correspondence with the connecting portions 112, the flange 300 is sleeved on the outer periphery of the base 101, and the connecting portions 112 are connected with the flange 300 through the connecting assembly. Compared with the prior art, for example, a conventional blower motor, the arrangement manner of the application saves space. First, the conventional blower motor needs to be provided with two relatively buckled flanges 300 to form a cooling air duct, so that the damping position can only be arranged at the outer periphery of the flange 300, but the blower motor in the application has less heat generated as an auxiliary boost, so that one flange 300 is saved, and only one flange 300 is used. Through the change of the structure, the damping position is transferred from the outer periphery of the flange 300 to the inner side; second, the arrangement manner of the application makes the overall structure of the blower motor small.

[0108] Among them, the plurality of connecting portions 112 are uniformly distributed around the outer periphery of the base 101. Of course, in other embodiments, the connecting portions 112 can not be arranged in the foregoing manner, but can be symmetrically arranged with respect to the diameter of the base 101 to maintain overall stability and ensure uniform damping.

[0109] In one possible implementation, the connecting portion 112 comprises a support seat 113 extending radially along the base 101 and a guide column 114 extending axially on the support seat 113, the axis of the guide column 114 is parallel to the axis of the sleeve 103 on the base 101, and the flange 300 has a slot hole 301 arranged in one-to-one correspondence with the guide column 114. Each connecting assembly comprises a damping pad 400 and a locking member 500, the damping pad 400 is embedded in the slot hole 301, the guide column 114 passes through the through hole 403 in the middle of the damping pad 400 and is connected with the locking member 500, and the damping pad 400 is compressed between the support seat 113 and the locking member 500. Among them, the damping pad 400 is made of rubber material and can be compressed to deform. Figure 8 In the structure shown in the figure, the outer periphery of the base 101 is provided with three connecting portions 112, and three guide columns 114 are arranged uniformly around the base 101.

[0110] Please refer to Figure 12 and Figure 16The guide column 114 has a hollow channel 115, and the inner wall of the channel 115 is internally threaded. The locking member 500 includes a gasket 501 and a screw 503. The threaded section 504 of the screw 503 passes through the internal hole 502 of the gasket 501 and enters the channel 115 of the guide column 114, and is threadedly connected with the channel 115. When the screw 503 is threadedly locked with the guide column 114, the damping pad 400 is compressed between the gasket 501 and the support seat 113. It is worth noting that the screwing amount of the screw 503 can be adjusted. If the damping pad 400 is compressed too tightly, the damping effect between the flange 300 and the motor will be poor. If the damping pad 400 is compressed too loosely, the motor will not be reliably fixed and will easily shake and interfere with the air conditioner cabinet. The optimal damping effect can be achieved by adjusting the screwing amount of the screw 503.

[0111] Specifically, the diameter of the internal hole 502 of the gasket 501 is smaller than the diameter of the head 505 of the screw 503, and the outer diameter of the gasket 501 is greater than the diameter of the through hole 403 on the damping pad 400.

[0112] Please refer to Figure 17 and Figure 18 The flange 300 includes a flange plate 302 and a guard plate 303 arranged around the outer periphery of the flange plate 302. The middle part of the flange plate 302 is provided with a flange hole 304, the side plate 108 of the base 101 passes through the flange hole 304, the shape of the flange hole 304 is matched with the outer periphery shape of the side plate 108, and there is a gap between the hole wall of the flange hole 304 and the side plate 108. A skirt plate 305 is arranged around the flange hole 304 on the flange plate 302, and the slot hole 301 is formed in the skirt plate 305. The skirt plate 305 is located between the upper end face and the lower end face of the guard plate 303. Optionally, the skirt plate 305 is located in the middle region in the axial direction of the guard plate 303.

[0113] In one possible implementation, the damping pad 400 includes a damping pad body 401, the through hole 403 penetrates through the damping pad body 401, the outer wall of the damping pad body 401 has a ring groove 402 recessed towards the through hole 403, the ring groove 402 is located in the middle position in the axial direction of the damping pad body 401, and the skirt plate 305 is embedded in the ring groove 402. The side wall of the ring groove 402 abuts against the skirt edge of the flange 300, and limits the damping pad 400 in the axial direction.

[0114] Optionally, the upper end face of the damping pad body 401 has a plurality of first buffer blocks 405 protruding outward, the lower end face of the damping pad body 401 has a plurality of second buffer blocks 406 protruding outward, the first buffer blocks 405 abut against the gasket 501, and the second buffer blocks 406 abut against the support seat 113. In Figure 19In the structure shown, the upper end surface of the damping pad body 401 is provided with a plurality of first buffer blocks 405, which are uniformly distributed around the through hole 403 on the damping pad body 401; the lower end surface of the damping pad body 401 is provided with a plurality of second buffer blocks 406, which are uniformly distributed around the through hole 403 on the damping pad body 401.

[0115] Further, as shown in the figure, the hole wall of the through hole 403 is provided with a reinforcing rib 404, the position of the reinforcing rib 404 corresponds to the position of the ring groove 402, and the reinforcing rib 404 plays a role in strengthening the structure of the damping pad 400. Figure 20

[0116] The mounting method of the embodiment is: 1, first, the damping pad 400 is embedded in the slot hole 301 of the flange 300; 2, the flange 300 is integrally sleeved on the periphery of the base 101, the guide column 114 on the base 101 penetrates the through hole 403 on the damping pad 400, and the lower end surface of the damping pad 400 abuts against the support seat 113; 3, the gasket 501 is placed on the upper end surface of the damping pad 400, and the screw 503 is screwed into the guide column 114 through the gasket 501, so as to compress the damping pad 400 by pressing the gasket 501, until the damping pad 400 is compressed to a preset amount, so that the damping pad 400 is compressed between the gasket 501 and the support seat 113.

[0117] The embodiment realizes the damping purpose by using the damping pad 400 described above, the overall damping structure of the accessory is reduced and has high integration, and the small volume requirement can be met. After the first buffer block 405 and the second buffer block 406 of the damping pad 400 are compressed, they still protrude from the end surface of the guide column 114 in the axial direction, can provide appropriate elastic force, and can effectively reduce the vibration of the motor and then transmit the vibration to the flange 300.

[0118] It is worth noting that: due to the particularity of the installation position of the rear-mounted blower in the present application, the size is small and the generated heat is low, so the rear-mounted blower in the present application saves the air duct for cooling the motor itself compared with the existing front-mounted blower.

[0119] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the present application patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.​

Claims

1. A blower motor characterized by, The motor module (200) and the impeller (600) are rotationally connected, the impeller (600) comprises an impeller support (601) and a plurality of blades (602) arranged around the impeller support (601), each blade (602) comprises an air inlet portion (603), a support portion (604), an air guide portion (605) and an air outlet portion (606) connected in sequence from inside to outside. An inner bending angle is formed on the first side wall of the blade (602) which actively receives airflow. The inner bending angle of the blade (602) gradually decreases and then gradually increases from the air inlet portion (603) to the air outlet portion (606). The thickness of the blade (602) gradually increases, then gradually decreases and then gradually increases from the air inlet portion (603) to the air outlet portion (606).

2. The blower motor of claim 1, wherein, An outer bending angle is formed on the second side wall of the blade (602) which is away from the first side wall, and the outer bending angle of the blade (602) gradually increases and then gradually decreases from the air inlet portion (603) to the air outlet portion (606).

3. The blower motor of claim 2, wherein, The air inlet portion (603) has a first bending curvature to collect airflow at the inlet of the impeller (600), the inner bending angle (a1) of the air inlet portion (603) is 124°-123°, and the outer bending angle (b1) of the air inlet portion (603) is 97°-105° to form the first bending curvature.

4. The blower motor of claim 2, wherein, The support portion (604) has a second bending curvature to improve the support strength, the inner bending angle (a2) of the support portion (604) is 123°-121°, and the outer bending angle (b2) of the support portion (604) is 105°-106° to form the second bending curvature.

5. The blower motor of claim 2, wherein, The air guide portion (605) has a third bending curvature to guide airflow, the inner bending angle (a3) of the air guide portion (605) is 121°-122°, and the outer bending angle (b3) of the air guide portion (605) is 105°-106° to form the third bending curvature.

6. The blower motor of claim 2, wherein, The air guide portion (605) has the smallest inner bending angle, and the air guide portion (605) has the largest outer bending angle.

7. The blower motor of claim 2, wherein, The air outlet portion (606) has a fourth bending curvature to guide airflow out, the inner bending angle (a4) of the air outlet portion (606) is 122°-123°, and the outer bending angle (b4) of the air outlet portion (606) is 106°-105° to form the fourth bending curvature.

8. The blower motor of claim 1, wherein, The thickness (d1) of the air inlet portion (603) is less than the thickness (d2) of the support portion (604), the thickness (d2) of the support portion (604) is greater than the thickness (d3) of the air guide portion (605), and the thickness (d3) of the air guide portion (605) is less than the thickness (d4) of the air outlet portion (606).

9. The blower motor of claim 8, wherein, The thickness (d1) of the air inlet part (603) is 0.89mm-1.03mm, the thickness (d2) of the support part (604) is 1.03mm-1.17mm, the thickness (d3) of the air guide part (605) is 1.17mm-1.12mm, and the thickness (d4) of the air outlet part (606) is 1.12mm-1.29mm.

10. The blower motor of claim 1, wherein, The impeller (600) is integrally formed by injection molding, and the material is PP, and the odor value is less than or equal to 3.

5.

11. The blower motor of claim 1, wherein, The impeller support (601) is recessed with a mounting cavity (610), and the mounting cavity (610) is used for mounting the motor module (200).

12. The blower motor of claim 11, wherein, The mounting cavity (610) is formed by recessing the outer end surface of the impeller support (601) along the axis, and the motor module (200) is at least partially or entirely mounted in the mounting cavity (610).

13. The blower motor of claim 11, wherein, The motor module (200) includes a rotating shaft (205) fixedly connected with the impeller support (601), and the impeller support (601) is formed with a connecting hole (611) inside the mounting cavity (610), and the connecting hole (611) is used for connecting the rotating shaft (205).

14. The blower motor of claim 11, wherein, The projection of the blade (602) in the radial direction at least partially falls on the side wall forming the mounting cavity (610), so that the airflow can flow through the mounting cavity (610) for heat dissipation.

15. The blower motor of claim 1, wherein, The first end (607) of the blade (602) is fixed to the impeller support (601), and the second end (608) of the blade (602) is fixed to the annular fixing member (609).

16. The blower motor of claim 15, wherein, The projection of the annular fixing member (609) in the axial direction is located on the outer side of the impeller support (601), so that the negative pressure is formed at the end face to suck out the heat in the motor module (200).

17. The blower motor of claim 13, wherein, The motor module (200) includes a stator assembly and a rotor assembly in gap cooperation with the stator assembly, and the rotor assembly is fixed to the rotating shaft (205).

18. The blower motor of claim 17, wherein, The stator assembly includes a plurality of winding stators (201) arranged around and a stator pin (202) electrically connected with the winding stator (201), and the stator pin (202) extends along the axis and is electrically connected with the circuit board (122).

19. The blower motor of claim 18, wherein, The rotor assembly includes a rotor shell (206) fixed to the rotating shaft (205) and a plurality of rotors (207) provided on the inner wall of the rotor shell (206), and the rotors (207) surround the winding stator (201).

20. The blower motor of claim 17, wherein, The stator assembly is fixed to the outer wall of the sleeve (103), and the rotor assembly is rotatably connected to the inner wall of the sleeve (103).

21. The blower motor of claim 20, wherein, The sleeve (103) forms a bearing chamber, the bearing chamber is provided with a bearing, and the rotating shaft (205) is rotatably connected with the sleeve (103) through the bearing.

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