blower

Abstract

The application discloses a kind of air blower, comprising: motor body, heat dissipation plate and cover are set in the rear cover assembly of heat dissipation plate;Heat dissipation plate is provided with connecting arm;Air blower further includes damping unit, damping unit includes: damping pad, damping pad is covered in connecting arm and is adapted to fit with connecting arm, the outer wall of damping pad and rear cover assembly abut;Sealing ring, sealing ring is around set in heat dissipation plate;The outer wall of sealing ring and rear cover assembly abut;Wherein, sealing ring and damping pad are made of flexible material and can absorb the vibration generated by rear cover assembly and heat dissipation plate.The application can simultaneously carry out damping using sealing ring and damping pad, increase damping area, improve damping effect;At the same time, the embedded groove that is adapted to the shape of connecting arm is set, so that damping pad can be covered in connecting arm to completely bear the connecting arm, and not easy to deform.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air blower, in particular to an air blower. BACKGROUND

[0002] The air blower is one of the components in the new energy vehicle. The air blower of the vehicle drives the airflow to flow by rotating the impeller, and the air flow is blown to each position after passing through the air duct, so as to achieve the effect of heat dissipation and refrigeration of the vehicle.

[0003] The existing new energy vehicle needs to add a damping part to the air blower to reduce the vibration generated by the air blower during operation in order to enhance the comfort. The existing air blower usually sets a damping pad at the connection between the connecting arm of the heat dissipation plate and the rear cover assembly for damping. This method can only damp at the connecting arm of the heat dissipation plate, and the damping area is small. Moreover, the existing damping pad usually has an exposed circular groove on the outer wall of the damping pad, and the connecting arm of the heat dissipation plate is arranged in the circular groove. The connecting arm is exposed to the outside, and the damping pad cannot completely bear the connecting arm. The damping pad of the circular groove is also prone to deformation when the parts of the air blower are axially pressed into the damping pad, and the damping effect is poor. In addition, the damping pad needs to maintain its position stability during installation and operation, but due to the influence of factors such as deformation, the position cannot be effectively guaranteed, resulting in poor damping effect. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides an air blower which uses a sealing ring and a damping pad to simultaneously dampen, thereby increasing the damping area and improving the damping effect. Meanwhile, an embedded groove matching the shape of the connecting arm is provided so that the damping pad can cover the connecting arm to completely bear the connecting arm and is not prone to deformation.

[0005] The present application is achieved by the following technical solutions:

[0006] An air blower, comprising: a motor body, a heat dissipation plate connected with the motor body, and a rear cover assembly arranged on the heat dissipation plate; the heat dissipation plate is provided with a connecting arm connected with the rear cover assembly;

[0007] The motor body comprises a mounting base, a stator assembly and a rotor assembly, the mounting base is formed with an assembly cavity, and at least a part of the stator assembly and the rotor assembly is arranged in the assembly cavity;

[0008] The heat dissipation plate is connected with the motor body, and the heat dissipation plate is provided with at least one connecting arm

[0009] The air blower further comprises a damping unit, and the damping unit comprises:

[0010] A damping pad is connected with the rear cover assembly and the heat dissipation plate respectively to reduce relative vibration between the rear cover assembly and the heat dissipation plate; the damping pad is provided with an embedded groove matched with the shape of the connecting arm; the embedded groove has an extension length along the circumference of the damping pad which is smaller than the circumference of the damping pad, the embedded groove is used to accommodate the connecting arm along the radial direction of the damping pad, and the damping pad forming the embedded groove covers at least a part of the outer circumference of the connecting arm;

[0011] The damping pad is provided with a sleeve hole, the rear cover assembly is provided with a sleeve column which can be arranged in the sleeve hole, the damping pad is sleeved on the sleeve column through the sleeve hole, the inner wall of the sleeve hole is provided with a first protruding part, at least a part of the first protruding part corresponds to the position of the embedded groove to compensate the wall thickness of the damping pad at the position where the embedded groove is arranged;

[0012] A sealing ring is arranged around the heat dissipation plate; the outer wall of the sealing ring abuts against the rear cover assembly; the rear cover assembly adopts a split design;

[0013] The sealing ring and the damping pad are made of flexible material and can be elastically deformed to absorb the vibration generated by the rear cover assembly and the heat dissipation plate when the vibration occurs between the rear cover assembly and the heat dissipation plate.

[0014] Further, the damping pad is provided with a protruding rib, the protruding rib extends along the length direction of the connecting arm, and the direction of the pressing force borne by the protruding rib is perpendicular to the length direction of the protruding rib.

[0015] Further, the number of the protruding ribs is multiple, and the multiple protruding ribs are arranged at intervals along the length direction of the connecting arm.

[0016] Further, the damping pad is provided with a main body part, the protruding rib is formed by protruding from the main body part along the axial direction of the damping pad, each of the protruding ribs is a long strip structure, the thickness of the protruding rib along the axial direction is 0.1-0.2 times the thickness of the main body part, and the width of the protruding rib along the radial direction is 0.1-0.2 times the maximum width of the main body part.

[0017] Further, the thickness of the embedded groove along the axial direction is 0.2-0.3 times the thickness of the main body part, the depth of the embedded groove along the radial direction of the damping pad is at least 0.5 times the minimum distance between the side of the main body part facing the connecting arm and the inner wall of the main body part along the radial direction of the damping pad;

[0018] And / or, the side wall of the inner groove formed around the damping pad and parallel to the axial direction of the damping pad has a thickness along the radial direction of the damping pad, which is at least 0.5 times the minimum distance between the side of the main body facing the connecting arm and the inner wall of the main body along the radial direction of the damping pad.

[0019] Further, the thickness of the first protruding part is 1.5-2.5 times the thickness of the inner groove.

[0020] Further, the inner wall of the sleeve hole is provided with a second protruding part, which is arranged in a spaced manner with the first protruding part, and both the first and second protruding parts abut against the sleeve column to position the sleeve column.

[0021] Further, the damping pad and the sealing ring are made of thirty-degree natural rubber.

[0022] Further, the rear cover assembly includes a plate cover unit provided with a sealing groove, at least a part of the sealing ring is accommodated in the sealing groove, the upper and lower ends of the sealing ring are respectively provided with end face ribbons, the sealing ring abuts against the upper and lower walls of the plate cover unit forming the sealing groove through a pair of end face ribbons and forms an interference fit, and the end face ribbons can be elastically deformed by being extruded by the plate cover unit to perform axial damping.

[0023] Further, at least a part of the side wall of the sealing ring is accommodated in the sealing groove and forms a gap with the inner wall of the plate cover unit forming the sealing groove.

[0024] When the sealing ring and the plate cover unit have relative radial vibration, the side wall of the sealing ring can abut against the inner wall forming the sealing groove and be elastically deformed to fill the gap to perform radial damping.

[0025] Further, the rear cover assembly covers the heat dissipation plate and forms a containing cavity together with the heat dissipation plate; the containing cavity accommodates a circuit board.

[0026] Further, the sealing ring is arranged at the connection between the rear cover assembly and the heat dissipation plate forming the containing cavity to seal the containing cavity.

[0027] Further, the rear cover assembly includes a rear cover connected to the heat dissipation plate and pressed against the sealing ring to make the rear cover and the sealing ring tightly abut against each other and form a first sealing part.

[0028] Further, the rear cover assembly further comprises a plate cover unit, the plate cover unit is provided with a sealing groove, at least a part of the sealing ring is accommodated in the sealing groove, and the upper end of the sealing ring is tightly abutted with the upper wall forming the sealing groove and forms a second sealing part, and the lower end of the sealing ring is tightly abutted with the lower wall forming the sealing groove and forms a third sealing part.

[0029] Further, the edge of the heat dissipation plate is provided with an edge protrusion extending along the axial direction of the heat dissipation plate; the sealing ring is provided with a radially extending accommodating cavity, the accommodating cavity comprises a first accommodating cavity and a second accommodating cavity which are in communication with each other, and a stepped surface is formed at the connection between the first accommodating cavity and the second accommodating cavity; the first accommodating cavity is matched with the edge protrusion, and the cross-sectional size of the first accommodating cavity is larger than that of the second accommodating cavity, so that the edge protrusion is clamped in the first accommodating cavity by the stepped surface and the sealing ring is radially limited.

[0030] Further, the length of the sealing ring in the circumferential direction is smaller than the length of the edge protrusion, so that the sealing ring is matched with the heat dissipation plate in an interference fit.

[0031] Further, the surface of the heat dissipation plate is formed with a plurality of positioning protrusions; the sealing ring is further provided with a plurality of positioning accommodating cavities matched with the positioning protrusions, the positioning protrusions are arranged in the positioning accommodating cavities and form circumferential limitation for the sealing ring.

[0032] Further, the rear cover assembly is abutted with the sealing ring and applies a pressing force to the sealing ring in the axial direction of the heat dissipation plate to form axial limitation for the sealing ring.

[0033] Further, the side of the heat dissipation plate facing the circuit board is provided with a grounding protrusion, the grounding protrusion is abutted with the circuit board to enable the circuit board to be grounded.

[0034] Further, the grounding protrusion is provided with four, and the four grounding protrusions are annularly arranged around the axis of the heat dissipation plate.

[0035] Further, one end of the circuit board is connected with a wire insertion part, the wire insertion part is abutted with the rear cover assembly and the circuit board after the rear cover assembly is covered on the heat dissipation plate, to lock the first end of the circuit board relative to the heat dissipation plate, the edge of the second end of the circuit board is abutted with a fastener, and the fastener is pressed against the circuit board and is locked relative to the heat dissipation plate, the first end and the second end of the circuit board are oppositely arranged; the wire insertion part and the fastener apply a pressing force to the opposite two ends of the circuit board to lock the circuit board.

[0036] Further, the edge of the circuit board is provided with a positioning groove, and the heat dissipation plate is provided with a limiting column corresponding to the position of the positioning groove, at least a part of the limiting column is accommodated in the positioning groove and limits the circuit board.

[0037] Further, the limiting column is connected with a fastener, one end of the fastener is formed with a pressing head, the pressing head of the fastener can press the circuit board; the limiting column is provided with a plurality of limiting columns, at least two limiting columns of the plurality of limiting columns are located at opposite ends of the circuit board.

[0038] Further, the fastener is located inside the accommodating cavity, or part or all of the fastener is located outside the accommodating cavity and connected with the limiting column through the mounting hole on the rear cover assembly.

[0039] Further, the board surface of the heat dissipation plate facing the circuit board is provided with a gap through the grounding protrusion, and one end of the circuit board facing the heat dissipation plate is provided with a heat conducting medium, the heat conducting medium fills the gap between the board surface and the circuit board at a predetermined position.

[0040] Further, the rear cover assembly comprises a rear cover and a cover unit, the cover unit is provided separately from the rear cover, and the cover unit is detachably connected with the motor body independently of the rear cover.

[0041] Compared with the prior art, the advantages of the present application are:

[0042] 1. By setting the damping unit composed of the damping pad and the sealing ring, the area of the damping part of the heat dissipation plate and the rear cover assembly is increased, and the damping effect is improved; and the damping pad is wrapped around the connecting arm of the heat dissipation plate, which can complete the bearing of the connecting arm and is not easy to deform; at the same time, the damping pad and the connecting arm are adaptively fitted, so that the surfaces of the damping pad for bearing the connecting arm are in uniform contact with the connecting arm, and the strength of each point on the bearing surface is balanced.

[0043] 2. By the radial limiting of the edge protrusion of the heat dissipation plate on the sealing ring, the circumferential limiting of the limiting column on the sealing ring, and the axial limiting of the rear cover assembly on the sealing ring, the sealing ring is prevented from moving during the operation of the air blower, and the stability of the sealing of the sealing ring is improved.

[0044] 3. By the plug-in part and the fastener, the opposite ends of the circuit board are pressed to lock the circuit board, without the need to open a locking hole in the circuit board, and the space utilization rate of the circuit board is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 A structure diagram of an air blower according to a preferred embodiment of the present application;

[0046] Figure 2 for Figure 1 Another structural schematic diagram of the medium-sized blower;

[0047] Figure 3 for Figure 1 A schematic diagram of the blower after the cover unit has been removed;

[0048] Figure 4 for Figure 1 A partial structural diagram of the blower;

[0049] Figure 5 for Figure 2 A sectional view of section EE;

[0050] Figure 6 for Figure 5 A magnified view of circle A in the middle;

[0051] Figure 7 This is a schematic diagram of the cross-section of the sealing ring;

[0052] Figure 8 for Figure 2 A sectional view of section FF in the middle;

[0053] Figure 9 for Figure 8 A magnified view of circle B in the middle;

[0054] Figure 10 This is a schematic diagram of the vibration damping pad structure;

[0055] Figure 11 This is a planar sectional view of the vibration damping pad;

[0056] Figure 12 for Figure 1 Exploded view of some parts of the blower structure;

[0057] Figure 13 for Figure 1 A structural diagram of another part of the blower;

[0058] Figure 14 for Figure 13 An exploded view of the middle section structure;

[0059] Figure 15 for Figure 13 A partial structural diagram. Detailed Implementation

[0060] The technical solutions of the present application will be further described in detail below in conjunction with preferred embodiments and the drawings of the embodiments. In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. In addition, the terms "first", "second" are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, but cannot be understood as limiting the present application.

[0061] As shown in Figures 1 to 15 A blower corresponding to the preferred embodiment of the present application includes a motor body 1, a heat sink 2 connected with the motor body 1, a rear cover assembly 4 covering the heat sink 2, a damping unit 7 and a circuit board 6. The rear cover assembly 4 and the heat sink 2 together form a receiving cavity 43 for accommodating electrical components, wherein the electrical components include the circuit board 6, which is arranged in the receiving cavity 43 and connected with the heat sink 2 to conduct the heat generated by the circuit board 6 to the heat sink 2 for heat dissipation. The damping unit 7 is connected with the rear cover assembly 4 and the heat sink 2; when the motor body 1 operates, vibration is generated, which causes the heat sink 2 connected with the motor body 1 and the rear cover assembly 4 connected with the heat sink 2 to vibrate, and the damping unit 7 connected with the rear cover assembly 4 and the heat sink 2 absorbs the vibration of the rear cover assembly 4 and the heat sink 2 to damp the blower of the present application.

[0062] The motor body 1 includes a mounting base, a stator assembly and a rotor assembly. The mounting base is formed with an assembly cavity, at least a part of the stator assembly and the rotor assembly is arranged in the assembly cavity, and the stator and rotor assemblies are connected with the heat sink 2. The assembly cavity can be connected with the outside through a heat dissipation channel, so that the outside air can flow into the assembly cavity from the heat dissipation channel, and at least a part of the outside air flowing into the assembly cavity flows through the heat sink 2 to take away the heat of the heat sink 2. The heat dissipation channel can be arranged in the rear cover assembly 4, for example, a chamber communicating with the outside and the assembly cavity is formed in the rear cover assembly 4, so that the chamber constitutes the heat dissipation channel.

[0063] Further referring to Figure 1The rear cover assembly 4 comprises a rear cover 41 connected with the heat dissipation plate 2 and a plate cover unit 42. The rear cover 41 covers the heat dissipation plate 2 and forms a containing cavity 43 for placing electrical devices with the heat dissipation plate 2. The edge of the rear cover 41 is provided with a through hole, and the heat dissipation plate 2 is provided with a threaded hole opposite to the position of the through hole of the rear cover 41. The rear cover 41 and the heat dissipation plate 2 are connected by a screw threadedly connected with the heat dissipation plate 2 through the through hole. The plate cover unit 42 comprises a plate cover 424 and a mounting flange 423 connected with each other. Further referring to Figure 3 In the existing rear cover assembly 4, the rear cover 41 and the plate cover 424 are usually integrally formed. However, in actual use, some users may design the plate cover 424 and the mounting flange 423 of the rear cover assembly 4 by themselves. In order to meet market demand, the rear cover assembly 4 of the present application adopts a split type plate cover unit 42 and a rear cover 41, and the plate cover unit 42 can be independently connected with the motor body 1 and can be detachably connected with the motor body 1, so that the air blower of the present application can be sold as a single machine after the plate cover unit 42 is detached. In addition, if the single machine after the plate cover unit 42 is detached fails, the single machine can be replaced alone without replacing the plate cover unit 42. Moreover, the single machine after the plate cover unit 42 is detached has a smaller volume than the whole air blower, and the single machine can also reduce the cost of delivery.

[0064] As shown in Figure 12 , the damping unit 7 comprises a sealing ring 3 and a damping pad 5 made of flexible material. The material of the sealing ring 3 and the damping pad 5 is preferably thirty-degree natural rubber, so that the material of the sealing ring 3 and the damping pad 5 is soft, the buffering effect is good, and the transmission of vibration can be effectively reduced. Moreover, the sealing ring 3 and the damping pad 5 made of thirty-degree natural rubber material are not easy to have edge lifting after being compressed.

[0065] Further referring to Figure 9 and Figure 10The damping pad 5 is arranged on the heat dissipation plate 2, and the outer wall of the damping pad 5 abuts against the rear cover assembly 4 to damp the heat dissipation plate 2 and the rear cover assembly 4. Specifically, the heat dissipation plate 2 comprises a main body part 21 and a connecting arm 23 extending outward from the main body part 21; the damping pad 5 covers at least part of the outer circumferential wall of the connecting arm 23, specifically, the damping pad 5 covers at least part of the connecting arm 23 extending from the side of the connecting arm 23 facing the damping pad 5 to the side of the connecting arm 23 away from the damping pad 5. To improve the damping effect of the damping pad 5 on the heat dissipation plate 2, the damping pad 5 is provided with an embedded groove 51 adapted to the connecting arm 23, and the embedded groove 51 is used to accommodate the connecting arm 23 along the radial direction of the damping pad 5. The extension length of the embedded groove 51 along the circumferential direction of the damping pad 5 is less than the circumference of the damping pad 5. The damping pad 5 forming the embedded groove 51 covers the outer circumferential side of the connecting arm 23 and is adapted to fit with the connecting arm 23, that is, the embedded groove 51 is the same shape as the part of the connecting arm 23 covered by the damping pad 5. The inner wall of the damping pad 5 forming the embedded groove 51 and the outer wall of the connecting arm 23 are uniformly fitted and can bear the impact force from the connecting arm 23, so that when the connecting arm 23 of the heat dissipation plate 2 vibrates, the force acting on the damping pad 5 can uniformly act on the inner wall surface of the embedded groove 51 in the damping pad 5 opposite to the direction of the impact force, ensuring that each point of the inner wall surface bears force uniformly, thereby improving the damping effect of the damping pad 5 on the heat dissipation plate 2. Moreover, the embedded groove 51 adapted to the connecting arm 23 can also make the connecting arm 23 and the damping pad 5 tightly fit in the radial direction when connected, further improving the damping effect of the damping pad 5 on the heat dissipation plate 2. In addition, by adopting the damping pad 5 with the embedded groove 51 covering the connecting arm 23, the damping pad 5 can completely bear the connecting arm 23; and compared with the damping pad 5 of the prior art provided with a ring-shaped groove to bear the connecting arm 23, the damping pad 5 of the present application can avoid the situation that the damping pad 5 collapses and deforms towards the empty position when bearing the axial compression force due to the part of the ring-shaped groove not accommodating the connecting arm 23.

[0066] Further referring to Figure 11The embedded groove 51 is formed on the main body 56 of the damping pad 5. Specifically, the embedded groove 51 can be formed from the side of the main body 56 facing the connecting arm 23 and extending along the length direction of the connecting arm 23. The thickness of the embedded groove 51 in the axial direction is 0.2-0.3 times the thickness of the main body 56, so as to avoid the thickness of the embedded groove 51 being too thick and affecting the damping effect of the damping pad 5. The side wall of the embedded groove 51, which is formed around the embedded groove 51 and parallel to the axial direction of the damping pad 5, has a thickness D1 in the radial direction of the damping pad 5, which is at least 0.5 times the minimum distance D3 between the side of the main body 56 facing the connecting arm 23 and the inner wall of the main body 56 in the radial direction of the damping pad 5; so as to avoid the part of the side wall of the damping pad 5 used to cover the connecting arm 23 being too thin after the embedded groove 51 is formed, which affects the covering effect of the damping pad 5 on the connecting arm 23. Preferably, the depth D2 of the embedded groove 51 in the radial direction of the damping pad 5 can also be set to be at least 0.5 times the minimum distance D3 between the side of the main body 56 facing the connecting arm 23 and the inner wall of the main body 56 in the radial direction of the damping pad 5; so as to ensure the depth of the damping pad 5 covering the connecting arm 23 and improve the covering effect of the damping pad 5 on the connecting arm 23. The opening end of the embedded groove 51 is provided with an arc segment 511 and a flat segment 512. The flat segment 512 is provided with a pair of flat segments 512, and the pair of flat segments 512 are arranged on opposite sides of the arc segment 511.

[0067] The damping pad 5 is connected with the heat dissipation plate 2 and also connected with the rear cover assembly 4 to simultaneously damp the rear cover assembly 4. The plate cover assembly 42 in the rear cover assembly 4 is formed with a receiving cavity 425 for receiving the damping pad 5.

[0068] The damping pad 5 is arranged in the receiving cavity 425, one end of the damping pad 5 abuts against the plate cover 424, the other end abuts against the mounting flange 423, and the side wall of the damping pad 5 arranged in the receiving cavity 425 abuts against the plate cover assembly 42 to increase the contact area of the damping pad 5 with the rear cover assembly 4 and improve the damping effect of the damping pad 5 on the rear cover assembly 4. The damping pad 5 arranged in the receiving cavity 425 can be pre-compressed to improve the damping effect of the damping pad 5, and the compression amount of the damping pad 5 is preferably 1.6%.

[0069] In addition, in order to facilitate the installation of the damping pad 5, the damping pad 5 is provided with a sleeving hole 52, and the rear cover assembly 4 is provided with a sleeving column 422 which can be arranged in the sleeving hole 52, so that the damping pad 5 provided with the sleeving hole 52 can be sleeved on the rear cover assembly 4. Specifically, the sleeving column 422 specifically includes a first sleeving column 4221 arranged on the mounting flange 423 and a second sleeving column 4222 arranged on the plate cover 424, and when the mounting flange 423 is connected with the plate cover 424, the first sleeving column 4221 and the second sleeving column 4222 abut against each other and jointly form the sleeving column 422. By arranging the sleeving column 422 composed of the first sleeving column 4221 and the second sleeving column 4222, the installation of the damping pad 5 is facilitated.

[0070] Because the damping pad 5 is provided with the sleeve hole 52 and the embedded groove 51 at the same time, the side wall thickness between the embedded groove 51 and the sleeve hole 52 is thin. In order to compensate for the thickness reduction caused by the embedded groove 51, the inner wall of the sleeve hole 52 in the damping pad 5 is provided with a first protruding part 53. At least a part of the first protruding part 53 corresponds to the position of the embedded groove 51 to compensate for the thickness of the damping pad 5 at the position of the embedded groove 51. Specifically, the first protruding part 53 can be slightly larger than the size of the embedded groove 51, that is, a part of the first protruding part 53 corresponds to the position of the embedded groove 51, and the other part surrounds the first protruding part 53 corresponding to the position of the embedded groove 51. For example, the thickness of the first protruding part 53 is 1.5-2.5 times the thickness of the embedded groove 51. By setting the first protruding part 53, the thickness reduction of the damping pad 5 caused by the embedded groove 51 is compensated to avoid the situation that the wall between the embedded groove 51 and the sleeve hole 52 in the damping pad 5 collapses and deforms due to the thin thickness.

[0071] In order to facilitate the installation and positioning of the damping pad 5, the inner wall of the sleeve hole 52 is provided with at least one second protruding part 54. The second protruding part 54 is spaced apart from and opposite to the first protruding part 53. The second protruding part 54 and the first protruding part 53 can both abut the sleeve column 422. The arc surfaces of the first protruding part 53 and the second protruding part 54 abutting the sleeve column 422 are the same as the curvature of the outer wall of the sleeve column 422. The centers of the arc surfaces of the first protruding part 53 and the second protruding part 54 abutting the sleeve column 422 are located on the center axis of the damping pad 5, so that the first protruding part 53 and the second protruding part 54 can centrally position the sleeve column 422.

[0072] In order to stably connect the damping pad 5 to the rear cover assembly 4, the rear cover assembly 4 is further provided with a screw sequentially connecting the first sleeve column 4221 and the second sleeve column 4222. The first sleeve column 4221 is provided with a through hole, and the second sleeve column 4222 is provided with a threaded hole, so that the screw can be arranged in the first sleeve column 4221 and threadedly connected with the second sleeve column 4222 to lock the damping pad 5 between the plate cover 424 and the mounting flange 423. At the same time, the screw can also realize the fixed connection between the plate cover 424 and the mounting flange 423.

[0073] Preferably, the upper and lower ends of the damping pad 5 are also provided with protruding ribs 55 extending in the radial direction of the damping pad 5, and the direction of the pressing force on the protruding ribs 55 is parallel to the axial direction of the damping pad 5. Specifically, the protruding ribs 55 protrude from the main body 56 in the axial direction of the damping pad 5, and the protruding ribs 55 at the upper and lower ends of the damping pad 5 abut against the plate cover 424 and the mounting flange 423 located on the upper and lower sides of the damping pad 5. Therefore, after the damping pad 5 is connected to the rear cover assembly 4, it bears the vertical pressing force applied by the plate cover 424 and the mounting flange 423, and the pressing force is perpendicular to the length direction of the protruding ribs 55. Preferably, a plurality of protruding ribs 55 are provided, and the protruding ribs 55 are distributed at intervals, and the extension direction of each protruding rib 55 is consistent with the length direction of the connecting arm 23. The number of protruding ribs 55 at the upper and lower ends of the damping pad 5 is the same, and the protruding ribs 55 at the same end are distributed at equal intervals to balance the stress on each protruding rib 55. The existing damping pad 5 is provided with an exposed annular groove, so that the connecting arm cannot be positioned circumferentially when connected to the existing damping pad, and the position of the protruding ribs on the surface of the existing damping pad cannot be unique. Therefore, the protruding ribs of the existing damping pad are usually arranged in a circumferential annular manner, and the stress direction of the protruding ribs of the existing damping pad is variable when bearing the pressing force, which easily causes uneven stress on each protruding rib of the damping pad. In the present application, the protruding ribs 55 of the damping pad 5 extend in the radial direction of the damping pad 5, so that the stress direction of each protruding rib 55 is unique and the stress is relatively balanced. Preferably, in one embodiment, the extension direction of each protruding rib 55 is consistent with the length direction of the connecting arm 23.

[0074] The protruding ribs 55 can extend along a guide line. For example, the protruding ribs 55 can extend along a straight guide line to form a long strip structure, or extend along a curved guide line to form a curved structure, or extend along a folded guide line to form a folded structure, etc. In the present embodiment, the protruding ribs 55 extend along a straight guide line to form a long strip structure, the thickness of the protruding ribs 55 is 0.1-0.2 times the thickness of the main body 56, and the width of the protruding ribs 55 is 0.1-0.2 times the maximum width of the main body 56. In addition, when the protruding ribs 55 adopt other forms such as curved structure, folded structure, etc., the thickness of the protruding ribs 55 and the width of the cross section of the protruding ribs 55 can be the same as those of the long strip structure.

[0075] Further, since the damping pad 5 is intermittently compressed and released by the heat dissipation plate 2 and the rear cover assembly 4 when absorbing vibration from the heat dissipation plate 2 and the rear cover assembly 4, a gap is formed between the inner side wall of the damping pad 5 and the sleeve connecting column 422 to compensate for the deformation release amount of the damping pad 5. Specifically, the protruding part formed on the inner side wall of the damping pad 5 extends towards the sleeve connecting column 422 and abuts against the sleeve connecting column 422 to avoid the damping pad 5 from shaking after being sleeved on the sleeve connecting column 422, and the remaining part of the inner side wall of the damping pad 5 keeps a gap with the sleeve connecting column 422 so that the gap can compensate for the deformation release amount of the damping pad 5 when the compression amount of the damping pad 5 is released.

[0076] Further referring to Figure 6 , Figure 7 and Figure 15 , the sealing ring 3 is sleeved around the heat dissipation plate 2, and the length of the sealing ring 3 in the circumferential direction can be less than the length of the edge protrusion 22 of the heat dissipation plate 2, so that the sealing ring 3 can be in interference fit with the heat dissipation plate 2 to improve the sealing effect between the sealing ring 3 and the heat dissipation plate 2. The sealing ring 3 is provided with a notch 38 for avoiding the damping pad 5; and the outer wall of the sealing ring 3 abuts against the rear cover assembly 4 to reduce the relative vibration between the rear cover assembly 4 and the heat dissipation plate 2. Specifically, the plate cover unit 42 in the rear cover assembly 4 is formed with a sealing groove 421, and a part of the sealing ring 3 is arranged in the sealing groove 421 and abuts against the plate cover unit 42; wherein the plate cover unit 42 includes upper and lower walls for forming the sealing groove 421 and an inner wall connected to the upper and lower walls, and the upper and lower walls and the inner wall together form the sealing groove 421 with an opening, and the sealing ring 3 is loaded into the sealing groove 421 from the opening. Through the damping of the sealing ring 3 and the damping pad 5, the sealing ring 3 sleeved around the heat dissipation plate 2 can also damp the heat dissipation plate 2 and the rear cover assembly 4 except for the damping by the damping pad 5 at the connecting arm 23, thereby increasing the damping area to improve the damping effect of the damping unit 7; and the arrangement of the sealing ring 3 around the heat dissipation plate 2 and the damping pad 5 at the notch 38 of the sealing ring 3 can also make the installation positions of the sealing ring 3 and the damping pad 5 more reasonable. Referring to Figure 6 , it is worth noting that a shock-avoiding gap is formed between the side wall of the rear cover 41 adjacent to the first sealing part 33 and the side wall of the plate cover unit 42 adjacent to the second sealing part 34, and interference does not occur during the damping process, and mutual vibration influence does not occur between the two.

[0077] The upper and lower ends of the sealing ring 3 are respectively provided with end face ribbons 36, the sealing ring 3 is abutted with the upper and lower walls forming the sealing groove 421 through the pair of end face ribbons 36 at the upper and lower ends, and the interference fit is formed, and the end face ribbons 36 of the sealing ring 3 can be flattened by the upper and lower walls forming the sealing groove 421, so that the heat dissipation plate 2 and the plate cover unit 42 are damped when axial vibration is generated, and the noise generated when the heat dissipation plate 2 or the plate cover unit 42 vibrates is also reduced. The compression amount of the sealing ring 3 is preferably 7.5%.

[0078] In addition, at least a part of the side wall of the sealing ring 3 is accommodated in the sealing groove 421 and a gap is formed with the inner wall forming the sealing groove 421; when the sealing ring 3 and the plate cover unit 42 have relative radial vibration, the side wall of the sealing ring 3 can abut against the inner wall of the plate cover unit 42 forming the sealing groove 421 and elastically deform to fill the gap for radial damping.

[0079] In addition to damping the heat dissipation plate 2 and the plate cover unit 42, the sealing ring 3 can also seal the containing cavity 43 to prevent water vapor from entering the containing cavity 43 and damaging the electrical devices in the containing cavity 43. At least a part of the sealing ring 3 is arranged at the connection between the rear cover assembly 4 and the heat dissipation plate 2 to form the containing cavity 43 to seal the containing cavity 43.

[0080] Specifically, three sealing parts are formed between the sealing ring 3 and the plate cover unit 42 to form three layers of sealing. The upper end of a part of the sealing ring 3 arranged in the sealing groove 421 is tightly abutted with the upper wall forming the sealing groove 421 to form a second sealing part 34, and the lower end of the sealing ring 3 is tightly abutted with the lower wall forming the sealing groove 421 to form a third sealing part 35. The third sealing part 35 is closer to the motor body 1 than the second sealing part 34, and the third sealing part 35 can prevent water vapor in the motor body 1 from entering the containing cavity 43; the second sealing part 34 can assist the third sealing part 35 to prevent water vapor in the motor body 1 from entering the containing cavity 43, that is, the water vapor that is not completely blocked by the third sealing part 35 moves to the second sealing part 34 and is sealed again by the second sealing part 34. At the same time, the rear cover 41 is connected to the heat dissipation plate 2 and is pressed against the sealing ring 3 to tightly abut the rear cover 41 with the sealing ring 3 to form a first sealing part 33. The first sealing part 33 can effectively prevent water vapor between the rear cover 41 and the plate cover 424 from entering the containing cavity 43. The third sealing part 35, the second sealing part 34 and the first sealing part 33 sequentially block the water vapor in the flow direction of the water vapor, realizing three-stage sealing of the water vapor, so that basically no water vapor enters the containing cavity 43, and the electrical devices in the containing cavity 43 are protected from water vapor damage.

[0081] To prevent the sealing ring 3 from shaking during use of the air blower, the sealing ring 3 is axially, circumferentially and radially limited to prevent the sealing ring 3 from shaking.

[0082] The sealing ring 3 is connected with the heat dissipation plate 2 to form radial limiting. Specifically, the heat dissipation plate 2 comprises a main body 21 and an edge protrusion 22 arranged at the edge of the main body 21 and extending along the axial direction of the heat dissipation plate 2. The sealing ring 3 is provided with an edge protrusion 22 extending along the axial direction of the heat dissipation plate 2. The sealing ring 3 is provided with a radially extending accommodating cavity 31, which comprises a first accommodating cavity 311 and a second accommodating cavity 312 in communication with each other, and a step surface 313 is formed at the connection between the first accommodating cavity 311 and the second accommodating cavity 312. The first accommodating cavity 311 is adapted to the edge protrusion 22 and can be used to accommodate the edge protrusion 22, and the second accommodating cavity 312 is adapted to the main body 21 of the heat dissipation plate 2 and can accommodate part of the structure of the main body 21 in the second accommodating cavity 312. The cross-sectional size of the first accommodating cavity 311 is larger than that of the second accommodating cavity 312, so that the edge protrusion 22 is clamped in the first accommodating cavity 311 by the step surface 313 to limit the sealing ring 3 radially.

[0083] Further referring to Figure 14 , the surface of the main body 21 of the heat dissipation plate 2 is formed with a plurality of positioning protrusions 211; the sealing ring 3 is further provided with a plurality of positioning accommodating cavities 32 adapted to the positioning protrusions 211, and when the sealing ring 3 is sleeved on the heat dissipation plate 2, the positioning protrusions 211 are arranged in the positioning accommodating cavities 32 and limit the inner wall forming the positioning accommodating cavities 32 to form circumferential limiting of the sealing ring 3 by the positioning protrusions 211.

[0084] At the same time, the rear cover 41 of the rear cover assembly 4 not only abuts against the sealing ring 3 to form the first sealing part 33, but also can apply a pressing force to the sealing ring 3 along the axial direction of the heat dissipation plate 2 to press the sealing ring 3 and form axial limiting of the sealing ring 3.

[0085] Further referring to Figures 12 to 15 , the electrical device arranged in the accommodating cavity 43 comprises a circuit board 6. The circuit board 6 is connected with the heat dissipation plate 2 to dissipate heat through the heat dissipation plate 2. Since the circuit board 6 is provided with a hole position, the edge 10mm of which cannot be provided with components, the space utilization rate of the circuit board 6 is low; in order to improve the space utilization rate of the circuit board 6, the side of the heat dissipation plate 2 facing the circuit board 6 is provided with a grounding protrusion 24 in the present application, and the grounding protrusion 24 abuts against the circuit board 6 to make the circuit board 6 grounded; compared with the prior art that four screws are arranged through the circuit board 6 to achieve grounding, the circuit board 6 of the present application does not need to be provided with holes for the screws to pass through, thereby effectively improving the space utilization rate of the circuit board 6. Preferably, four grounding protrusions 24 are arranged, and the four grounding protrusions 24 are arranged in an annular array around the axis of the heat dissipation plate 2; the four grounding protrusions 24 abut against the circuit board 6 to make the circuit board 6 grounded, and at the same time, the four grounding protrusions 24 can support the circuit board 6, so that a gap is formed between the circuit board 6 and the plate surface 26 of the heat dissipation plate 2 facing the circuit board 6.

[0086] In order to facilitate heat dissipation of the circuit board 6, a heat-conducting medium is arranged on the side of the circuit board 6 facing the heat-dissipating plate 2, and the heat-conducting medium fills the gap between the plate surface 26 and the circuit board 6 at a preset position. The preset position is where the electronic components are concentrated, and it is also where the heat generated during operation is mainly concentrated. Specifically, the thickness of the heat-conducting medium is greater than the above-mentioned gap before the circuit board 6 is connected with the heat-dissipating plate 2, and the heat-conducting medium is in a paste-like structure. When the circuit board 6 is connected with the heat-dissipating plate 2, the paste-like heat-conducting medium can be extruded by the circuit board 6 and the heat-dissipating plate 2 to tightly abut the circuit board 6 and the heat-dissipating plate 2, so that the heat-conducting medium can be connected with the heat-dissipating plate 2 when the circuit board 6 is connected with the heat-dissipating plate 2, so as to facilitate the conduction of heat from the circuit board 6 to the heat-dissipating plate 2 through the heat-conducting medium. The heat-conducting medium is specifically heat-conducting mud.

[0087] In order to further improve the space utilization rate of the circuit board 6, one end of the circuit board 6 is connected with a plug-in part 61, and the plug-in part 61 abuts against the circuit board 6 and presses the circuit board 6; the edge of the other end of the circuit board 6 is connected with a fastener 62, and the fastener 62 can press the circuit board 6. The plug-in part 61 and the fastener 62 apply pressing force to the opposite ends of the circuit board 6 to lock the circuit board 6. It is worth noting that the plug-in part 61 abuts against the rear cover assembly 4 after the rear cover assembly 4 is covered on the heat-dissipating plate 2, and the rear cover assembly has a pressing action on the plug-in part 61, so that the plug-in part can press the circuit board 6. The plug-in part 61 is arranged at the end of the circuit board 6 away from the heat-dissipating plate 2, and the plug-in part 61 abuts against the rear cover assembly 4 and the circuit board 6 after the rear cover assembly 4 is covered on the heat-dissipating plate 2, so as to apply pressing force to the circuit board 6 towards the heat-dissipating plate 2. By locking the circuit board 6 with the plug-in part 61 and the fastener 62, there is no need to open holes in the circuit board 6 for the locking screw to pass through, so as to improve the space utilization rate of the circuit board 6.

[0088] To position the circuit board 6, the edge of the circuit board 6 is provided with a positioning groove 63, and the heat dissipation plate 2 is provided with a limiting column 25 corresponding to the position of the positioning groove 63. When the circuit board 6 is connected with the heat dissipation plate 2, at least part of the limiting column 25 is accommodated in the positioning groove 63 and abuts against the side wall forming the positioning groove 63 to limit the circuit board 6. Specifically, the limiting column 25 is provided in plurality, and at least two limiting columns 25 located at opposite ends of the circuit board 6 are included in the plurality of limiting columns 25, and the two limiting columns 25 located at opposite ends of the circuit board 6 are distributed in a diamond shape with the plug-in part 61 and the fastener 62 located at the opposite end of the circuit board 6 and the plug-in part 61. Among them, the limiting column 25 is specifically provided in three, one of the three limiting columns 25 is connected with the fastener 62 located at the opposite end of the circuit board 6 and the plug-in part 61, and the other two limiting columns 25 are located at the two sides adjacent to the side connected with the plug-in part 61 of the circuit board 6. Preferably, the three limiting columns 25 are all connected with the fastener 62, wherein the fastener 62 is provided with a pressing head 621 which can abut against the circuit board 6 and press the circuit board 6. The fastener 62 is specifically a screw, and the limiting column 25 is provided with a threaded hole, the threaded column of the screw is threadedly connected with the limiting column 25, and the screw head of the screw presses the circuit board 6 to stabilize the circuit board 6. It is worth noting that in one of the possible embodiments, the screw is located inside the accommodating cavity 43, and through the threaded connection with the limiting column 25, the screw head of the screw presses the circuit board 6 to stabilize the circuit board 6. In another possible embodiment, part or all of the screws are located outside the accommodating cavity 43, the screw is first threaded through the mounting hole on the rear cover assembly 4 and then threadedly connected with the limiting column 25, at this time the structure at the mounting hole on the rear cover assembly 4 can abut against the circuit board 6 and press the circuit board 6, realizing the effect of stabilizing the circuit board 6.

[0089] In use, the motor body operates and causes the heat dissipation plate 2 and the rear cover assembly 4 to vibrate, and the sealing ring 3 and the damping pad 5 connected with the heat dissipation plate 2 and the rear cover assembly 4 absorb and reduce the vibration of the heat dissipation plate 2 and the rear cover assembly 4 through the elasticity of the sealing ring 3 and the damping pad 5. The sealing ring 3 also forms three sealing parts with the rear cover assembly 4 to prevent water vapor from entering the containing cavity 43. The circuit board 6 is tightly fixed by the fastener 62 and the plug-in part 61 and conducts heat to the heat dissipation plate 2 through the heat-conducting mud to achieve heat dissipation. By arranging the damping unit 7 composed of the damping pad 5 and the sealing ring 3, the area of the damping part of the heat dissipation plate 2 and the rear cover assembly 4 is increased, and the damping effect is improved. Moreover, the damping pad 5 is wrapped around the connecting arm 23 of the heat dissipation plate 2, which can complete the bearing of the connecting arm 23 and is not easy to deform. At the same time, the damping pad 5 and the connecting arm 23 are adaptively fitted, which also makes the surfaces of the damping pad 5 used for bearing the connecting arm 23 uniformly contact with the connecting arm 23, so as to ensure the balanced strength of each point on the bearing surface. The plug-in part 61 and the fastener 62 apply a pressing force to the opposite ends of the circuit board 6 to lock the circuit board 6, without the need to open locking holes in the circuit board 6, which effectively improves the space utilization of the circuit board 6. By the radial limiting of the sealing ring 3 by the edge protrusion 22 of the heat dissipation plate 2, the circumferential limiting of the sealing ring 3 by the positioning column, and the axial limiting of the sealing ring 3 by the rear cover assembly 4, the sealing ring 3 is prevented from moving during the operation of the blower, and the stability of the sealing of the sealing ring 3 is improved.

[0090] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A blower, comprising: The motor body (1), a heat sink (2) connected to the motor body (1), and a rear cover assembly (4) covering the heat sink (2); the heat sink (2) is provided with a connecting arm (23) connected to the rear cover assembly (4); characterized in that, The motor body (1) includes a mounting base, a stator assembly and a rotor assembly, wherein the mounting base has an assembly cavity, and at least a portion of the stator assembly and the rotor assembly are disposed within the assembly cavity; The heat sink (2) is connected to the motor body (1), and the heat sink (2) is provided with at least one connecting arm (23). The blower also includes a vibration damping unit (7), which comprises: Vibration damping pad (5), the vibration damping pad (5) is connected to the rear cover assembly (4) and the heat sink (2) respectively to reduce the relative vibration between the rear cover assembly (4) and the heat sink (2); the vibration damping pad (5) is provided with an embedded groove (51) adapted to the shape of the connecting arm (23); the extension length of the embedded groove (51) along the circumference of the vibration damping pad (5) is less than the circumference of the vibration damping pad (5), the embedded groove (51) is used to receive the connecting arm (23) along the radial direction of the vibration damping pad (5), and the vibration damping pad (5) forming the embedded groove (51) covers at least a portion of the outer peripheral side of the connecting arm (23); The vibration damping pad (5) is provided with a socket hole (52), and the rear cover assembly (4) is provided with a socket post (422) that can pass through the socket hole (52). The vibration damping pad (5) is sleeved on the socket post (422) through the socket hole (52). The inner wall of the socket hole (52) is provided with a first protrusion (53). At least a portion of the first protrusion (53) corresponds to the position of the inner groove (51) to compensate for the wall thickness of the vibration damping pad (5) at the inner groove (51). A sealing ring (3) is sleeved around the heat sink (2); the outer wall of the sealing ring (3) abuts against the rear cover assembly (4); the rear cover assembly (4) adopts a split design; The sealing ring (3) and the vibration damping pad (5) are both made of flexible material and can undergo elastic deformation when the back cover assembly (4) and the heat sink (2) vibrate to absorb the vibration generated by the back cover assembly (4) and the heat sink (2).

2. The blower according to claim 1, characterized in that, The vibration damping pad (5) is provided with raised ribs (55), which extend along the length direction of the connecting arm (23), and the direction of the pressing force on the raised ribs (55) is perpendicular to the length direction of the raised ribs (55).

3. The blower according to claim 2, characterized in that, The number of the raised ribs (55) is set to a plurality, and the plurality of raised ribs (55) are spaced apart along the length direction of the connecting arm (23).

4. The blower according to claim 2, characterized in that, The vibration damping pad (5) is provided with a main body (56), and the raised ribs (55) are formed by protruding from the main body (56) along the axial direction of the vibration damping pad (5). Each raised rib (55) is a long strip structure. The thickness of the raised rib (55) along the axial direction is 0.1 to 0.2 times the thickness of the main body (56), and the width of the raised rib (55) along the radial direction is 0.1 to 0.2 times the maximum width of the main body (56).

5. The blower according to claim 4, characterized in that, The thickness of the inner groove (51) in the axial direction is 0.2 to 0.3 times the thickness of the main body (56), and the depth (D2) of the inner groove (51) in the radial direction of the damping pad (5) is at least 0.5 times the minimum distance (D3) between the side of the main body (56) facing the connecting arm (23) and the inner wall of the main body (56) in the radial direction of the damping pad (5). And / or, the sidewall that forms the inner groove (51) and is parallel to the axial direction of the damping pad (5) has a thickness (D1) in the radial direction of the damping pad (5) that is at least 0.5 times the minimum distance (D3) between the side of the main body (56) facing the connecting arm (23) and the inner wall of the main body (56) in the radial direction of the damping pad (5).

6. The blower according to claim 5, characterized in that, The thickness of the first protrusion (53) is 1.5 to 2.5 times the thickness of the inner groove (51).

7. The blower according to claim 5, characterized in that, The inner wall of the socket (52) is provided with a second protrusion (54), the second protrusion (54) is spaced apart from the first protrusion (53), and both the second protrusion (54) and the first protrusion (53) abut against the socket (422) to center and position the socket (422).

8. The blower according to any one of claims 1 to 7, characterized in that, The vibration damping pad (5) and the sealing ring (3) are both made of 30-degree natural rubber.

9. The blower according to claim 1, characterized in that, The rear cover assembly (4) includes a cover unit (42) with a sealing groove (421). At least a portion of the sealing ring (3) is housed in the sealing groove (421). The upper and lower ends of the sealing ring (3) are respectively provided with end face ribs (36). The sealing ring (3) abuts against the upper and lower walls of the sealing groove (421) formed in the cover unit (42) through a pair of end face ribs (36) and forms an interference fit. The end face ribs (36) can be squeezed by the cover unit (42) to undergo elastic deformation for axial vibration reduction.

10. The blower according to claim 9, characterized in that, At least a portion of the sidewall of the sealing ring (3) is received in the sealing groove (421) and a gap is formed between it and the inner wall of the sealing groove (421) in the cover unit (42). When the sealing ring (3) and the cover unit (42) vibrate radially relative to each other, the sidewall of the sealing ring (3) can abut against the inner wall of the sealing groove (421) and undergo elastic deformation to fill the gap and reduce radial vibration.

11. The blower according to claim 1, characterized in that, The rear cover assembly (4) covers the heat sink (2) and together with the heat sink (2) forms a cavity (43); the cavity (43) contains a circuit board (6).

12. The blower according to claim 11, characterized in that, The sealing ring (3) is disposed at the connection between the rear cover assembly (4) and the heat sink (2) to form the accommodating cavity (43) to seal the accommodating cavity (43).

13. The blower according to claim 11, characterized in that, The rear cover assembly (4) includes a rear cover (41) which is connected to the heat sink (2) and pressed against the sealing ring (3) so that the rear cover (41) and the sealing ring (3) are in close contact and form a first sealing part (33).

14. The blower according to claim 13, characterized in that, The rear cover assembly (4) further includes a cover unit (42), which is provided with a sealing groove (421). At least a portion of the sealing ring (3) is received in the sealing groove (421), and the upper end of the sealing ring (3) is in close contact with the upper wall forming the sealing groove (421) to form a second sealing part (34). The lower end of the sealing ring (3) is in close contact with the lower wall forming the sealing groove (421) to form a third sealing part (35).

15. The blower according to claim 14, characterized in that, The third sealing part (35), the second sealing part (34) and the first sealing part (33) sequentially block water vapor along the direction of water vapor flow.

16. The blower according to claim 14, characterized in that, The edge of the heat sink (2) is provided with an edge protrusion (22) extending axially along the heat sink (2); the sealing ring (3) has a radially extending receiving cavity (31), the receiving cavity (31) includes a first receiving cavity (311) and a second receiving cavity (312) that are interconnected, and a stepped surface (313) is formed at the connection between the first receiving cavity (311) and the second receiving cavity (312); the first receiving cavity (311) is adapted to the edge protrusion (22), and the cross-sectional dimension of the first receiving cavity (311) in the axial direction is larger than the cross-sectional dimension of the second receiving cavity (312) so that the edge protrusion (22) is locked in the first receiving cavity (311) by the stepped surface (313) and radially limits the sealing ring (3).

17. The blower according to claim 16, characterized in that, The length of the sealing ring (3) in the circumferential direction is less than the length of the edge protrusion (22) so that the sealing ring (3) is adapted to the heat sink (2) with an interference fit.

18. The blower according to claim 13, characterized in that, The surface of the heat sink (2) has a plurality of positioning protrusions (211); the sealing ring (3) is also provided with a plurality of positioning receiving cavities (32) adapted to the positioning protrusions (211), the positioning protrusions (211) are disposed in the positioning receiving cavities (32) and form circumferential limiting on the sealing ring (3).

19. The blower according to claim 18, characterized in that, The rear cover assembly (4) abuts against the sealing ring (3) and applies a clamping force to the sealing ring (3) in the axial direction of the heat sink (2) to form an axial limit on the sealing ring (3).

20. The blower according to claim 12, characterized in that, The heat sink (2) has a grounding protrusion (24) on the side facing the circuit board (6), and the grounding protrusion (24) abuts against the circuit board (6) to ground the circuit board (6).

21. The blower according to claim 20, characterized in that, Four grounding protrusions (24) are provided, and the four grounding protrusions (24) are arranged in a ring array around the axis of the heat sink (2).

22. The blower according to claim 20, characterized in that, One end of the circuit board (6) is connected to a plug part (61). After the back cover assembly (4) is placed on the heat sink (2), the plug part (61) abuts against the back cover assembly (4) and the circuit board (6) respectively to lock the first end of the circuit board (6) relative to the heat sink (2). The edge of the second end of the circuit board (6) is connected to a fastener (62), and the fastener (62) presses the circuit board (6) and locks it relative to the heat sink (2). The first end and the second end of the circuit board (6) are arranged opposite to each other. The plug part (61) and the fastener (62) apply a clamping force to the opposite ends of the circuit board (6) to lock the circuit board (6).

23. The blower according to claim 20, characterized in that, The circuit board (6) has a positioning groove (63) on its edge, and the heat sink (2) has a limiting post (25) corresponding to the position of the positioning groove (63). At least a part of the limiting post (25) is received in the positioning groove (63) and limits the circuit board (6).

24. The blower according to claim 23, characterized in that, The limiting post (25) is connected to a fastener (62), and one end of the fastener (62) is formed with a clamping head (621). The clamping head (621) of the fastener (62) can clamp the circuit board (6). Multiple limiting posts (25) are provided, and at least two of the multiple limiting posts (25) are located at opposite ends of the circuit board (6).

25. The blower according to claim 24, characterized in that, The fastener (62) is located inside the receiving cavity (43), or some or all of the fasteners (62) are located outside the receiving cavity and are connected to the limiting post (25) after passing through the mounting hole on the rear cover assembly (4).

26. The blower according to any one of claims 20 to 25, characterized in that, The heat sink (2) has a gap between its surface (26) facing the circuit board (6) and the circuit board (6) through the grounding protrusion (24). A heat-conducting medium is provided at one end of the circuit board (6) facing the heat sink (2), and the heat-conducting medium fills the preset position of the gap formed between the surface (26) and the circuit board (6).

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