Blower

Abstract

The invention discloses an air blower which comprises a motor body, a heat dissipation plate and a rear cover assembly covering the heat dissipation plate. The heat dissipation plate is provided with a connecting arm; the air blower further comprises a vibration reduction unit, the vibration reduction unit comprises a vibration reduction pad, the vibration reduction pad wraps the connecting arm and is attached to the connecting arm in a matched mode, and the outer wall of the vibration reduction pad abuts against the rear cover assembly. The sealing ring is arranged on the heat dissipation plate in a surrounding and sleeving manner; the outer wall of the sealing ring abuts against the rear cover assembly. The sealing ring and the anti-vibration pad are made of flexible materials and can absorb vibration generated by the rear cover assembly and the heat dissipation plate. The sealing ring and the anti-vibration pad can be adopted for vibration reduction at the same time, the vibration reduction area is increased, and the vibration reduction effect is improved; meanwhile, the embedded groove matched with the connecting arm in shape is formed, so that the anti-vibration pad can wrap the connecting arm so as to completely bear the connecting arm, and the anti-vibration pad is not prone to deformation.

Description

Technical Field

[0001] The invention relates to the field of fans, and in particular to a blower. Background Art

[0002] The blower is one of the components in new energy vehicles. The car blower drives the air flow through the rotation of the impeller, sucking the gas inside or outside the car into the blower, and the air flow blows to various positions after passing through the air duct, thereby achieving the effect of heat dissipation and cooling of the car.

[0003] In order to enhance the comfort of existing new energy vehicles, it is necessary to add shock-absorbing parts to the blower to reduce the vibration generated by the blower during operation. Existing blowers usually set a vibration-damping pad at the connection between the connecting arm of the heat sink and the rear cover assembly for vibration reduction; this method can only reduce vibration at the connecting arm of the heat sink, and the vibration reduction area is small. In addition, the existing vibration-damping pad usually has an exposed annular groove on the outer wall of the vibration-damping pad, and the connecting arm of the heat sink is set in the annular groove. The connecting arm is exposed to the outside world, and the vibration-damping pad cannot fully support the connecting arm; and the vibration-damping pad in the annular groove is also prone to deformation when the blower components are axially pressed onto the vibration-damping pad, and the vibration-damping effect is poor. In addition, the vibration-damping pad needs to maintain the stability of its own position during installation and operation, but due to the influence of factors such as deformation, the position cannot be effectively guaranteed, resulting in poor shock-damping effect. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a blower, which adopts a sealing ring and a vibration-damping pad to simultaneously reduce vibration, thereby increasing the vibration-damping area and improving the vibration-damping effect. At the same time, an embedded groove adapted to the shape of the connecting arm is provided so that the vibration-damping pad can be covered on the connecting arm to fully support the connecting arm and is not easily deformed.

[0005] The present invention is achieved through the following technical solutions:

[0006] A blower, comprising: a motor body, a heat sink connected to the motor body, and a rear cover assembly covered on the heat sink; the heat sink is provided with a connecting arm connected to 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 portion of the stator assembly and the rotor assembly are arranged in the assembly cavity;

[0008] The heat sink is connected to the motor body and is provided with at least one connecting arm.

[0009] The blower further comprises a vibration reduction unit, wherein the vibration reduction unit comprises:

[0010] A vibration-damping pad, the vibration-damping pad is respectively connected to the rear cover assembly and the heat sink to reduce the relative vibration between the rear cover assembly and the heat sink; the vibration-damping pad is provided with an embedded groove adapted to the shape of the connecting arm; the extending length of the embedded groove along the circumference of the vibration-damping pad is less than the circumference of the vibration-damping pad, the embedded groove is used to accommodate the connecting arm along the radial direction of the vibration-damping pad, and the vibration-damping pad forming the embedded groove is covered on the outer circumference of at least a part of the connecting arm;

[0011] The vibration damping pad is provided with a sleeve hole, the rear cover assembly is provided with a sleeve column that can be inserted into the sleeve hole, the vibration damping pad is sleeved on the sleeve column through the sleeve hole, and the inner wall of the sleeve hole is provided with a first protrusion, at least a part of the first protrusion corresponds to the position of the embedded groove to compensate for the wall thickness of the vibration damping pad where the embedded groove is opened;

[0012] A sealing ring, the 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] Wherein, the sealing ring and the vibration-damping pad are both made of flexible materials and can be elastically deformed when the rear cover assembly and the heat sink vibrate to absorb the vibration generated by the rear cover assembly and the heat sink.

[0014] Furthermore, the vibration damping pad is provided with raised ribs, the raised ribs extend along the length direction of the connecting arm, and the direction of the pressing force on the raised ribs is perpendicular to the length direction of the raised ribs.

[0015] Furthermore, there are a plurality of the raised ribs, and the plurality of the raised ribs are spaced apart along the length direction of the connecting arm.

[0016] Furthermore, the vibration damping pad is provided with a main body, the raised ribs are formed by protruding from the main body along the axial direction of the vibration damping pad, each of the raised ribs is a long strip structure, the thickness of the raised ribs in the axial direction is 0.1 to 0.2 times the thickness of the main body, and the width of the raised ribs in the radial direction is 0.1 to 0.2 times the maximum width of the main body.

[0017] Furthermore, the thickness of the embedded groove in the axial direction is 0.2 to 0.3 times the thickness of the main body, and the depth of the embedded groove along the radial direction of the vibration damping pad is at least 0.5 times the minimum spacing 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 vibration damping pad;

[0018] And / or, the side wall that surrounds the embedded groove and is parallel to the axial direction of the vibration damping pad has a thickness along the radial direction of the vibration damping pad that is at least 0.5 times the minimum spacing 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 vibration damping pad.

[0019] Furthermore, the thickness of the first protrusion is 1.5 to 2.5 times the thickness of the embedded groove.

[0020] Furthermore, a second protrusion is provided on the inner wall forming the sleeve hole, the second protrusion is spaced apart from the first protrusion, and the second protrusion and the first protrusion are both in contact with the sleeve column to position the sleeve column.

[0021] Furthermore, the vibration damping pad and the sealing ring are both made of 30-degree natural rubber.

[0022] Furthermore, the rear cover assembly includes a plate cover unit with a sealing groove, at least a portion of the sealing ring is accommodated in the sealing groove, and end face ribs are respectively provided at the upper and lower ends of the sealing ring. The sealing ring abuts against the upper and lower walls of the sealing groove formed in the plate cover unit through a pair of the end face ribs to form an interference fit, and the end face ribs can be elastically deformed by being squeezed by the plate cover unit to perform axial vibration reduction.

[0023] Furthermore, at least a portion of the side wall of the sealing ring is received 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 vibrate relative to each other in the radial direction, the side wall of the sealing ring may abut against the inner wall forming the sealing groove and undergo elastic deformation to fill the gap for radial vibration reduction.

[0025] Furthermore, the rear cover assembly is covered on the heat dissipation plate and forms a receiving cavity together with the heat dissipation plate; the circuit board is received in the receiving cavity.

[0026] Furthermore, the sealing ring is arranged at the connection between the rear cover assembly and the heat dissipation plate to form the accommodating cavity, so as to seal the accommodating cavity.

[0027] Furthermore, the rear cover assembly includes a rear cover, and the rear cover is connected to the heat dissipation plate and pressed against the sealing ring so that the rear cover and the sealing ring are in close contact and form a first sealing portion.

[0028] Furthermore, the back cover assembly also includes a plate cover unit, which is provided with a sealing groove, at least a portion of the sealing ring is accommodated in the sealing groove, and the upper end of the sealing ring is tightly abutted against the upper wall forming the sealing groove to form a second sealing portion, and the lower end of the sealing ring is tightly abutted against the lower wall forming the sealing groove to form a third sealing portion.

[0029] Furthermore, the edge of the heat sink is provided with an edge protrusion extending axially along the heat sink; the sealing ring is provided with a radially extending accommodating cavity, the accommodating cavity includes a first accommodating cavity and a second accommodating cavity which are interconnected, and a step surface is formed at the connection between the first accommodating cavity and the second accommodating cavity; the first accommodating cavity is adapted to the edge protrusion, and the cross-sectional size of the first accommodating cavity is larger than the cross-sectional size of the second accommodating cavity so that the edge protrusion is clamped in the first accommodating cavity by the step surface and the sealing ring is radially limited.

[0030] Furthermore, 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 adapted to the heat dissipation plate in an interference fit.

[0031] Furthermore, a plurality of positioning protrusions are formed on the surface of the heat dissipation plate; the sealing ring is also provided with a plurality of positioning accommodating cavities adapted to the positioning protrusions, and the positioning protrusions are arranged in the positioning accommodating cavities and form circumferential limit for the sealing ring.

[0032] Furthermore, the rear cover assembly abuts against the sealing ring and applies a pressing force along the axial direction of the heat sink to the sealing ring to form an axial limit for the sealing ring.

[0033] Furthermore, a grounding protrusion is provided on a side of the heat dissipation plate facing the circuit board, and the grounding protrusion abuts against the circuit board to ground the circuit board.

[0034] Furthermore, four grounding protrusions are provided, and the four grounding protrusions are distributed in a ring array around the axis of the heat sink.

[0035] Furthermore, one end of the circuit board is connected to a wire insertion portion, and after the rear cover assembly is covered on the heat sink, the wire insertion portion respectively abuts against the rear cover assembly and the circuit board to lock the first end of the circuit board relative to the heat sink, and a fastener is butted against the edge of the second end of the circuit board and the fastener presses the circuit board to lock it relative to the heat sink, and the first end and the second end of the circuit board are arranged opposite to each other; the wire insertion portion and the fastener apply a pressing force to the opposite ends of the circuit board to lock the circuit board.

[0036] Furthermore, a positioning groove is provided at the edge of the circuit board, and the heat sink is provided with a limiting column corresponding to the position of the positioning groove, and at least a part of the limiting column is received in the positioning groove to limit the circuit board.

[0037] Furthermore, the limiting column is connected to a fastener, a clamping head is formed at one end of the fastener, and the clamping head of the fastener can clamp the circuit board; the limiting columns are arranged in plurality, and the plurality of limiting columns include at least two limiting columns located at opposite ends of the circuit board.

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

[0039] Furthermore, a gap is formed between the heat sink surface facing the circuit board and the circuit board through the grounding protrusion, and a heat-conducting medium is provided at one end of the circuit board facing the heat sink, and the heat-conducting medium is filled in a preset position of the gap formed between the surface and the circuit board.

[0040] Furthermore, the rear cover assembly includes a rear cover and a plate cover unit, the plate cover unit and the rear cover are separately arranged, and the plate cover unit can be detachably connected to the motor body independently of the rear cover.

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

[0042] 1. By setting a vibration reduction unit composed of a vibration reduction pad and a sealing ring, the area of ​​the vibration reduction part of the heat sink and the rear cover assembly is increased, and the vibration reduction effect is improved; and the vibration reduction pad is wrapped around the connecting arm of the heat sink to complete the support of the connecting arm, and it is not easy to deform; at the same time, the vibration reduction pad and the connecting arm are adapted and fitted so that each surface of the vibration reduction pad used to support the connecting arm is in uniform contact with the connecting arm, ensuring the balanced strength of each point on the bearing surface.

[0043] 2. The radial limit of the sealing ring by the edge protrusion of the heat sink, the circumferential limit of the sealing ring by the positioning column, and the axial limit of the rear cover assembly and the sealing ring can prevent the sealing ring from moving during the operation of the blower, thereby improving the sealing stability of the sealing ring.

[0044] 3. The circuit board is locked by applying a clamping force to the opposite ends of the circuit board through the plug-in part and the fastener. There is no need to open a locking hole inside the circuit board, which effectively improves the space utilization of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A structural schematic diagram of a blower according to a preferred embodiment of the present invention;

[0046] Figure 2 for Figure 1 A structural diagram of the middle blower from another perspective;

[0047] Figure 3 for Figure 1 Schematic diagram of the blower structure after the plate cover unit is removed;

[0048] Figure 4 for Figure 1 Schematic diagram of some structures of the blower;

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

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

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

[0052] Figure 8 for Figure 2 Cross-sectional view of the FF section;

[0053] Fig. 9 for Figure 8 Enlarged view of circle B in the middle;

[0054] Fig.10 It is a schematic diagram of the structure of the vibration damping pad;

[0055] Fig.11 It is a plane cross-sectional view of the vibration damping pad;

[0056] Fig.12 for Figure 1 An exploded view of some of the blower's structures;

[0057] Fig.13 for Figure 1 A schematic diagram of the structure of another part of the blower;

[0058] Fig.14 for Fig.13 Exploded view of the structure of the middle part;

[0059] Fig.15 for Fig.13 Schematic diagram of part of the structure. DETAILED DESCRIPTION

[0060] The following is a further non-restrictive detailed description of the technical solution of the invention in conjunction with the preferred embodiments and the accompanying drawings. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, 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 present invention, and cannot be understood as limitations on the present invention.

[0061] like Figures 1 to 15 As shown, a blower corresponding to a preferred embodiment of the present invention includes a motor body 1, a heat sink 2 connected to the motor body 1, a rear cover assembly 4 covered on the heat sink 2, a vibration reduction 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 a circuit board 6, which is disposed in the receiving cavity 43 and connected to the heat sink 2 to conduct the heat generated by the circuit board 6 to the heat sink 2 for heat dissipation. The vibration reduction unit 7 is connected to the rear cover assembly 4 and the heat sink 2; when the motor body 1 is running, vibration will be generated, thereby causing the heat sink 2 connected to the motor body 1 and the rear cover assembly 4 connected to the heat sink 2 to vibrate, and the vibration of the rear cover assembly 4 and the heat sink 2 is absorbed by the vibration reduction unit 7 connected to the rear cover assembly 4 and the heat sink 2 to reduce the vibration of the blower of the present invention.

[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, in which at least a portion of the stator assembly and the rotor assembly are arranged, and the stator and rotor assembly are connected to the heat sink 2. The assembly cavity can be connected to the outside world through a heat dissipation channel, so that the outside air can flow from the heat dissipation channel into the assembly cavity, and at least a portion of the outside air flows through the heat sink 2 when flowing into the assembly cavity 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 connecting the outside world and the assembly cavity is opened in the rear cover assembly 4, so that the chamber constitutes a heat dissipation channel.

[0063] Further references Figure 1The back cover assembly 4 includes a back cover 41 connected to the heat sink 2 and a plate cover unit 42. The back cover 41 is covered on the heat sink 2 and forms a receiving cavity 43 with the heat sink 2 for placing electrical components, wherein a through hole is provided at the edge of the back cover 41, and the heat sink 2 is provided with a threaded hole opposite to the through hole of the back cover 41. The back cover 41 and the heat sink 2 are connected by screws that penetrate through the through hole and are threadedly connected to the heat sink 2 through the threaded hole. The plate cover unit 42 includes a plate cover 424 and a mounting flange 423 that are connected to each other. For further reference Figure 3 In the existing rear cover assembly 4, the rear cover 41 and the plate cover 424 are mostly formed in one piece. However, in actual use, some users will design the plate cover 424 and the mounting flange 423 in the rear cover assembly 4 by themselves. In order to meet market demand, the rear cover assembly 4 of the present invention adopts a split plate cover unit 42 and a rear cover 41, and the plate cover unit 42 can be detachably connected to the motor body 1 independently of the rear cover 41, so that the blower of the present invention can be shipped separately after the plate cover unit 42 is removed. In addition, if a single unit fails after the plate cover unit 42 is removed, the single unit can also be replaced separately without replacing the plate cover unit 42; and the single unit after the plate cover unit 42 is removed is smaller than the overall volume of the blower, and shipping a single unit can also reduce the shipping cost.

[0064] like Fig.12 As shown, the vibration reduction unit 7 includes a sealing ring 3 and a vibration reduction pad 5 made of flexible material. The sealing ring 3 and the vibration reduction pad 5 are preferably made of 30-degree natural rubber, so that the sealing ring 3 and the vibration reduction pad 5 are softer, have better buffering effect and can effectively reduce the transmission of vibration; and the sealing ring 3 and the vibration reduction pad 5 made of 30-degree natural rubber are not prone to edge warping after being compressed.

[0065] Further references Fig. 9 and Fig.10, the vibration-damping pad 5 is sleeved on the heat sink 2, and the outer wall of the vibration-damping pad 5 abuts against the rear cover assembly 4 to reduce vibration of the heat sink 2 and the rear cover assembly 4. Specifically, the heat sink 2 includes a main body 21 and a connecting arm 23 extending outward from the main body 21; the vibration-damping pad 5 covers at least a portion of the outer peripheral wall of the connecting arm 23, specifically, the vibration-damping pad 5 covers at least a portion of the connecting arm 23 extending from the side facing the vibration-damping pad 5 to the connecting arm 23 away from the vibration-damping pad 5. In order to improve the vibration-damping effect of the vibration-damping pad 5 on the heat sink 2, the vibration-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 vibration-damping pad 5. The extension length of the embedded groove 51 along the circumferential direction of the vibration-damping pad 5 is less than the circumference of the vibration-damping pad 5. The vibration-damping pad 5 with the embedded groove 51 is coated on the outer peripheral side of the connecting arm 23 and fits with the connecting arm 23, that is, the embedded groove 51 has the same shape as the part of the connecting arm 23 covered by the vibration-damping pad 5. The inner wall of the embedded groove 51 formed in the vibration-damping pad 5 is evenly fitted with the outer wall of the connecting arm 23 and can bear the impact force from the connecting arm 23, so that when the connecting arm 23 of the heat sink 2 vibrates, the force acting on the vibration-damping pad 5 can be evenly acted on the inner wall surface of the vibration-damping pad 5 that forms the embedded groove 51 and is opposite to the direction of the impact force, ensuring that each point of the inner wall surface is uniformly stressed, thereby improving the vibration-damping effect of the vibration-damping pad 5 on the heat sink 2. In addition, the embedded groove 51 that fits with the connecting arm 23 can also make the connecting arm 23 fit tightly with the vibration-damping pad 5 in the radial direction when connected, further improving the vibration-damping effect of the vibration-damping pad 5 on the heat sink 2. In addition, by using a vibration-damping pad 5 with an embedded groove 51 to cover the connecting arm 23, the vibration-damping pad 5 can completely support the connecting arm 23; and, compared with the existing vibration-damping pad 5 with an annular groove to support the connecting arm 23, the vibration-damping pad 5 of the present invention can avoid the vibration-damping pad 5 collapsing and deforming toward the empty position when it is subjected to the axial pressing force because the annular groove does not accommodate the part of the connecting arm 23 left vacant.

[0066] Further references Fig.11, wherein the embedded groove 51 is provided in the main body 56 of the vibration-damping pad 5. Specifically, the embedded groove 51 can be formed by extending from the side of the main body 56 facing the connecting arm 23 along the length direction of the connecting arm 23. The thickness of the embedded groove 51 in the axial direction is 0.2 to 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 vibration-damping effect of the vibration-damping pad 5. The side wall that surrounds the embedded groove 51 and is parallel to the axial direction of the vibration-damping pad 5 has a thickness D1 in the radial direction of the vibration-damping pad 5 that is at least 0.5 times the minimum spacing D3 between the side of the main body 56 facing the connecting arm 23 and the inner wall of the main body 56 along the radial direction of the vibration-damping pad 5; so as to avoid that after the embedded groove 51 is provided, the thickness of the part of the side wall of the vibration-damping pad 5 used for covering the connecting arm 23 is too thin, affecting the covering effect of the vibration-damping pad 5 on the connecting arm 23. Preferably, the depth D2 of the embedded groove 51 along the radial direction of the vibration-damping pad 5 can also be set to at least 0.5 times the minimum spacing D3 between the side surface of the main body 56 facing the connecting arm 23 and the inner wall of the main body 56 along the radial direction of the vibration-damping pad 5, so as to ensure the depth of the vibration-damping pad 5 covering the connecting arm 23 and improve the covering effect of the vibration-damping pad 5 on the connecting arm 23. The open end of the embedded groove 51 is provided with a curved surface segment 511 and a flat surface segment 512. A pair of flat surfaces 512 are provided, and the pair of flat surfaces 512 are provided on opposite sides of the curved surface segment 511.

[0067] The vibration-damping pad 5 is connected to the heat sink 2 and the rear cover assembly 4 at the same time to simultaneously reduce vibration of the rear cover assembly 4. The plate cover assembly 42 in the rear cover assembly 4 is formed with an accommodating cavity 425 for accommodating the vibration-damping pad 5.

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

[0069] In addition, to facilitate the installation of the vibration damping pad 5, the vibration damping pad 5 is provided with a sleeve hole 52, and the rear cover assembly 4 is provided with a sleeve column 422 that can be inserted into the sleeve hole 52 so that the vibration damping pad 5 provided with the sleeve hole 52 can be sleeved on the rear cover assembly 4. Specifically, the sleeve column 422 specifically includes a first sleeve column 4221 provided on the mounting flange 423 and a second sleeve column 4222 provided on the plate cover 424. When the mounting flange 423 is connected to the plate cover 424, the first sleeve column 4221 and the second sleeve column 4222 abut against each other and jointly form the sleeve column 422. The sleeve column 422 composed of the first sleeve column 4221 and the second sleeve column 4222 can facilitate the installation of the vibration damping pad 5.

[0070] Since the vibration damping pad 5 is provided with both the sleeve hole 52 and the embedded groove 51, the thickness of the side wall between the embedded groove 51 and the sleeve hole 52 is relatively thin. In order to compensate for the reduced wall thickness due to the provision of the embedded groove 51, the inner wall of the sleeve hole 52 formed in the vibration damping pad 5 is provided with a first protrusion 53, and at least a portion of the first protrusion 53 corresponds to the position of the embedded groove 51 to compensate for the wall thickness of the vibration damping pad 5 where the embedded groove 51 is formed; specifically, the first protrusion 53 may be slightly larger than the size of the embedded groove 51, that is, a portion of the first protrusion 53 corresponds to the position of the embedded groove 51, and another portion surrounds the portion of the first protrusion 53 corresponding to the position of the embedded groove 51. For example, the thickness of the first protrusion 53 is 1.5 to 2.5 times the thickness of the embedded groove 51. The first protrusion 53 is provided to compensate for the reduced wall thickness of the vibration damping pad 5 due to the provision of the embedded groove 51 , so as to avoid the situation in which the wall between the embedded groove 51 and the sleeve hole 52 in the vibration damping pad 5 collapses and deforms due to its thin thickness.

[0071] To facilitate the installation and positioning of the vibration damping pad 5, at least one second protrusion 54 is provided on the inner wall of the sleeve hole 52, and the second protrusion 54 is spaced apart from and arranged opposite to the first protrusion 53, and the second protrusion 54 and the first protrusion 53 can both abut against the sleeve column 422, and the arc surface where the first protrusion 53, the second protrusion 54 and the sleeve column 422 abut is the same as the curvature of the outer wall of the sleeve column 422, and the center of the arc surface where the first protrusion 53, the second protrusion 54 and the sleeve column 422 abut is located on the central axis of the vibration damping pad 5, so that the first protrusion 53 and the second protrusion 54 can center the sleeve column 422.

[0072] In order to firmly connect the vibration-damping pad 5 to the rear cover assembly 4, the rear cover assembly 4 is further provided with screws that sequentially connect 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 passed through the first sleeve column 4221 and threadedly connected with the second sleeve column 4222 to lock the vibration-damping pad 5 between the plate cover 424 and the mounting flange 423, and 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 vibration damping pad 5 are further provided with raised ribs 55, which extend in the radial direction of the vibration damping pad 5, and the direction of the pressing force on the raised ribs 55 is parallel to the axial direction of the vibration damping pad 5. Specifically, the raised ribs 55 are formed by protruding from the main body 56 along the axial direction of the vibration damping pad 5, and the raised ribs 55 at the upper and lower ends of the vibration damping pad 5 abut against the plate cover 424 and the mounting flange 423 located on the upper and lower sides of the vibration damping pad 5. Therefore, after the vibration damping pad 5 is connected to the rear cover assembly 4, it is subjected to 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 raised ribs 55. Preferably, a plurality of raised ribs 55 are provided, and the plurality of raised ribs 55 are distributed at intervals, and the extension direction of each raised rib 55 is consistent with the length direction of the connecting arm 23. The number of raised ribs 55 at the upper and lower ends of the vibration damping pad 5 is the same, and the raised ribs 55 at the same end are evenly spaced so that the force on each raised rib 55 is balanced. The existing vibration damping pad 5 has an exposed annular groove so that the connecting arm is not infinitely spaced circumferentially when connected to the existing vibration damping pad, resulting in the position of the raised ribs on the surface of the existing vibration damping pad cannot be unique and the multiple raised ribs are often distributed in a circumferential annular manner. Therefore, the force direction of the raised ribs of the existing vibration damping pad is changeable when subjected to the pressing force, which can easily cause the phenomenon of uneven force on each raised rib of the vibration damping pad. The raised ribs 55 of the vibration damping pad 5 of the present invention all adopt a structure extending along the radial direction of the vibration damping pad 5, so that the force direction of each raised rib 55 is unique and the force is relatively balanced. In a preferred embodiment, the extension direction of each raised rib 55 is consistent with the length direction of the connecting arm 23.

[0074] Among them, the raised rib 55 can be formed by extending along a guide line; for example, the raised rib 55 extends along a straight guide line to form a long strip structure, or extends along a curved guide line to form a curved structure, or extends along a folded guide line to form a folded structure, etc. In this embodiment, the raised rib 55 can be extended along a straight guide line to form a long strip structure, and the thickness of the raised rib 55 is 0.1 to 0.2 times the thickness of the main body 56, and the width of the raised rib 55 is 0.1 to 0.2 times the maximum width of the main body 56. In addition, when the raised rib 55 adopts other forms such as a curved structure, a folded structure, etc., the thickness of the raised rib 55 and the width of the cross section of the raised rib 55 can be the same as the raised rib 55 of the long strip structure.

[0075] Furthermore, since the vibration-damping pad 5 is intermittently squeezed by the heat sink 2 and the rear cover assembly 4 and is continuously compressed and released when absorbing the vibration from the heat sink 2 and the rear cover assembly 4, a gap is formed between the inner side wall of the vibration-damping pad 5 and the sleeve column 422 to compensate for the deformation release amount generated when the vibration-damping pad 5 is released. Specifically, the protrusion formed on the inner side wall of the vibration-damping pad 5 extends toward the sleeve column 422 and abuts against the sleeve column 422 to avoid shaking of the vibration-damping pad 5 after being sleeved on the sleeve column 422, and the rest of the inner side wall of the vibration-damping pad 5 maintains a gap with the sleeve column 422 so that when the compression amount of the vibration-damping pad 5 is released, the gap can compensate for the deformation release amount of the vibration-damping pad 5.

[0076] Further references Figure 6 , Figure 7 and Fig.15 , the sealing ring 3 is arranged around the heat sink 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 sink 2, so that the sealing ring 3 can be interference fit with the heat sink 2, thereby improving the sealing effect between the sealing ring 3 and the heat sink 2. The sealing ring 3 is provided with a notch 38 for avoiding the vibration 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 sink 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 surrounding the sealing groove 421 and an inner wall connecting the upper and lower walls, and the upper and lower walls and the inner wall together form a sealing groove 421 with an opening, and the sealing ring 3 is installed into the sealing groove 421 from the opening. Through the joint vibration reduction of the sealing ring 3 and the vibration reduction pad 5, in addition to the vibration reduction at the connecting arm 23 between the heat sink 2 and the rear cover assembly 4 through the vibration reduction pad 5, the sealing ring 3 surrounding the heat sink 2 can also reduce the vibration of the heat sink 2 and the rear cover assembly 4, increasing the vibration reduction area to improve the vibration reduction effect of the vibration reduction unit 7; and the setting method of surrounding the sealing ring 3 around the heat sink 2 and setting the vibration reduction pad 5 at the notch 38 of the sealing ring 3 can also make the installation position of the sealing ring 3 and the vibration reduction pad 5 more reasonable. Figure 6 It is worth noting that a shock-absorbing avoidance gap is formed between the side wall of the rear cover 41 adjacent to the first sealing portion 33 and the side wall of the plate cover unit 42 adjacent to the second sealing portion 34, so that no interference will occur during the shock-absorbing process, and no mutual vibration influence will be generated between the two.

[0077] The upper and lower ends of the sealing ring 3 are respectively provided with end ribs 36. The sealing ring 3 abuts against the upper and lower walls of the sealing groove 421 through a pair of end ribs 36 at the upper and lower ends to form an interference fit, and the end ribs 36 of the sealing ring 3 can be flattened by the upper and lower walls of the sealing groove 421 to reduce the vibration of the heat sink 2 and the plate cover unit 42 when the heat sink 2 or the plate cover unit 42 generates axial vibration, and also reduce the noise generated when the heat sink 2 or the plate cover unit 42 generates vibration. The compression amount of the sealing ring 3 is preferably 7.5%.

[0078] In addition, at least a portion of the side wall of the sealing ring 3 is accommodated in the sealing groove 421 and forms a gap with the inner wall forming the sealing groove 421; when the sealing ring 3 and the plate cover unit 42 undergo relative radial vibration, the side wall of the sealing ring 3 can abut against the inner wall forming the sealing groove 421 in the plate cover unit 42 and undergo elastic deformation to fill the above-mentioned gap for radial vibration reduction.

[0079] In addition to reducing vibration of the heat sink 2 and the plate cover unit 42, the sealing ring 3 can also seal the accommodating cavity 43 to prevent water vapor from entering the accommodating cavity 43 and damaging the electrical components in the accommodating cavity 43. Among them, at least a part of the sealing ring 3 is arranged 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.

[0080] Specifically, three sealing parts are formed between the sealing ring 3 and the plate cover unit 42 to form a three-layer seal. The upper end of a portion of the sealing ring 3 disposed in the sealing groove 421 is tightly abutted against 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 against 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 the water vapor in the motor body 1 from entering the accommodating chamber 43; the second sealing part 34 can assist the third sealing part 35 in preventing the water vapor in the motor body 1 from entering the accommodating chamber 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 back cover 41 is connected to the heat dissipation plate 2 and pressed against the sealing ring 3 so that the back cover 41 is tightly abutted against the sealing ring 3 to form the first sealing part 33. The first sealing portion 33 can effectively prevent the water vapor between the back cover 41 and the plate cover 424 from entering the accommodating cavity 43. The third sealing portion 35, the second sealing portion 34 and the first sealing portion 33 sequentially block the water vapor along the flow direction of the water vapor, realizing a three-level sealing of the water vapor, so that substantially no water vapor enters the accommodating cavity 43, and the electrical components in the accommodating cavity 43 are protected from damage by water vapor.

[0081] In order to prevent the sealing ring 3 from shaking during the use of the blower, the present invention limits the sealing ring 3 in the axial, circumferential and radial directions to prevent the sealing ring 3 from shaking.

[0082] The sealing ring 3 is adapted to be connected with the heat sink 2 to form radial position limiting; specifically, the heat sink 2 includes a main body 21 and an edge protrusion 22 arranged at the edge of the main body 21 and extending axially along the heat sink 2; the sealing ring 3 is provided with the edge protrusion 22 extending axially along the heat sink 2. The sealing ring 3 is provided with a radially extending accommodation cavity 31, and the accommodation cavity 31 includes a first accommodation cavity 311 and a second accommodation cavity 312 that are interconnected, and a step surface 313 is formed at the connection between the first accommodation cavity 311 and the second accommodation cavity 312. The first accommodation cavity 311 is adapted to the edge protrusion 22 and can be used to accommodate the edge protrusion 22, and the second accommodation cavity 312 is adapted to the main body 21 of the heat sink 2 and can accommodate part of the structure of the main body 21 in the second accommodation cavity 312. The cross-sectional size of the first accommodation cavity 311 is larger than the cross-sectional size of the second accommodation cavity 312 so that the edge protrusion 22 is clamped in the first accommodation cavity 311 by the step surface 313 to radially limit the sealing ring 3.

[0083] In addition, further reference Fig.14 A plurality of positioning protrusions 211 are formed on the surface of the main body 21 of the heat dissipation plate 2; the sealing ring 3 is also provided with a plurality of positioning accommodating cavities 32 adapted to the positioning protrusions 211. 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 so that the positioning protrusions 211 form a circumferential limit on the sealing ring 3.

[0084] At the same time, the rear cover 41 in the rear cover assembly 4 not only abuts against the sealing ring 3 to form the first sealing portion 33 , but also applies a pressing force along the axial direction of the heat sink 2 to the sealing ring 3 to compress the sealing ring 3 and form an axial limit for the sealing ring 3 .

[0085] Further references Figures 12 to 15 , the electrical components arranged in the accommodating cavity 43 include a circuit board 6. The circuit board 6 is connected to the heat sink 2 to dissipate heat through the heat sink 2. Since components cannot be arranged at 10mm of the edge where the holes are opened on the circuit board 6, 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 heat sink 2 in the present invention is provided with a grounding protrusion 24 on the side facing the circuit board 6, and the grounding protrusion 24 abuts against the circuit board 6 to enable the circuit board 6 to be grounded; compared with the existing circuit board 6 that uses four screws penetrating the circuit board 6 to achieve grounding, the circuit board 6 of the present invention does not need to be provided with holes for the screws to pass through, which effectively improves the space utilization rate of the circuit board 6. Among them, it is preferred that four grounding protrusions 24 are arranged, and the four grounding protrusions 24 are distributed in a circular array around the axis of the heat sink 2; the four grounding protrusions 24 abut against the circuit board 6 to enable the circuit board 6 to be grounded and can also support the circuit board 6, so that a gap is formed between the circuit board 6 and the board surface 26 of the heat sink 2 facing the circuit board 6.

[0086] In order to facilitate the heat dissipation of the circuit board 6, a heat-conducting medium is provided on the side of the circuit board 6 facing the heat sink 2, and the heat-conducting medium is filled at a preset position of the gap formed between the board surface 26 and the circuit board 6. The preset position is where the electronic components are concentrated, and this is also where the heat is mainly generated during the working process. Specifically, the thickness of the heat-conducting medium is greater than the above-mentioned gap before the circuit board 6 is connected to the heat sink 2, and the heat-conducting medium is a paste-like structure. When the circuit board 6 is connected to the heat sink 2, the paste-like heat-conducting medium can be squeezed by the circuit board 6 and the heat sink 2 to be tightly abutted against the circuit board 6 and the heat sink 2, so that when the circuit board 6 is connected to the heat sink 2, the heat-conducting medium can be connected to the heat sink 2 so that the heat of the circuit board 6 is transferred to the heat sink 2 through the heat-conducting medium. Among them, the heat-conducting medium is specifically a thermal conductive mud.

[0087] In order to further improve the space utilization of the circuit board 6, a wire insertion portion 61 is connected to one end of the circuit board 6, and the wire insertion portion 61 abuts against the circuit board 6 and presses the circuit board 6; a fastener 62 is connected to the edge of the other end of the circuit board 6, and the fastener 62 can press the circuit board 6. The wire insertion portion 61 and the fastener 62 apply a pressing force to the opposite ends of the circuit board 6 to lock the circuit board 6. It is worth noting that the wire insertion portion 61 abuts against the rear cover assembly 4 after the rear cover assembly 4 is covered on the heat sink 2, and the rear cover assembly has a pressing action on the wire insertion portion 61, so that the wire insertion portion can press the circuit board 6. Among them, the wire insertion portion 61 is arranged at one end of the circuit board 6 away from the heat sink 2, and the wire insertion portion 61 abuts against the rear cover assembly 4 and the circuit board 6 respectively after the rear cover assembly 4 is covered on the heat sink 2, so as to apply a pressing force toward the heat sink 2 to the circuit board 6. The circuit board 6 is locked by the wire insertion portion 61 and the fastener 62 , and there is no need to provide a hole in the circuit board 6 for the locking screw to pass through, so as to improve the space utilization of the circuit board 6 .

[0088] In order to position the circuit board 6, a positioning groove 63 is provided at the edge of the circuit board 6, and a limiting column 25 corresponding to the position of the positioning groove 63 is provided on the heat sink 2. When the circuit board 6 is connected to the heat sink 2, at least a portion 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, a plurality of limiting columns 25 are provided, and the plurality of limiting columns 25 include at least two limiting columns 25 located at opposite ends of the circuit board 6, and the two limiting columns 25 located at opposite ends of the circuit board 6 are distributed in a rhombus shape with the wire plugging portion 61 and the fastener 62 located at the opposite end of the circuit board 6 and the wire plugging portion 61. Among them, the limiting columns 25 are specifically provided in three, one of the three limiting columns 25 is connected to the fastener 62 located at the opposite end of the circuit board 6 and the wire plugging portion 61, and the remaining two limiting columns 25 are located on both sides of the circuit board 6 adjacent to one side of the connecting wire plugging portion 61. Preferably, the three limiting columns 25 are all connected with fasteners 62, wherein the fasteners 62 are provided with a clamping head 621 that can abut against and press the circuit board 6. The fasteners 62 are specifically screws, and the limiting columns 25 are provided with threaded holes. The threaded column of the screw is threadedly connected to the limiting columns 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 feasible embodiment, the screw is located inside the accommodating cavity 43, and is threadedly connected to the limiting columns 25 so that the screw head of the screw presses the circuit board 6 to stabilize the circuit board 6. In another feasible embodiment, some or all of the screws are located outside the accommodating cavity 43, and the screws first pass through the mounting holes on the rear cover assembly 4 and then are threadedly connected to the limiting columns 25. At this time, the structure at the mounting holes on the rear cover assembly 4 can abut against and press the circuit board 6, thereby achieving the effect of stabilizing the circuit board 6.

[0089] When in use, the motor body runs and causes the heat sink 2 and the rear cover assembly 4 to vibrate. The sealing ring 3 and the vibration-damping pad 5 connected to the heat sink 2 and the rear cover assembly 4 absorb and reduce the vibration of the heat sink 2 and the rear cover assembly 4 through their own elasticity. The sealing ring 3 also forms three sealing parts with the rear cover assembly 4 to prevent water vapor from entering the accommodating cavity 43. The circuit board 6 is pressed and fixed by the fastener 62 and the plug-in part 61 and conducts heat to the heat sink 2 through the thermal mud to achieve heat dissipation. By setting the vibration-damping unit 7 composed of the vibration-damping pad 5 and the sealing ring 3, the area of ​​the vibration-damping part of the heat sink 2 and the rear cover assembly 4 is increased, and the vibration-damping effect is improved; and the vibration-damping pad 5 is wrapped around the connecting arm 23 of the heat sink 2 to complete the bearing of the connecting arm 23, and it is not easy to deform; at the same time, the vibration-damping pad 5 is adapted and fitted to the connecting arm 23, so that the surfaces of the vibration-damping pad 5 used to bear the connecting arm 23 are in uniform contact with the connecting arm 23, ensuring the strength balance of each point on the bearing surface. The circuit board 6 is locked by applying a pressing force to the opposite ends of the circuit board 6 through the wire insertion part 61 and the fastener 62, without opening a locking hole inside the circuit board 6, which effectively improves the space utilization of the circuit board 6. The radial limit of the sealing ring 3 by the edge protrusion 22 of the heat sink 2, the circumferential limit of the sealing ring 3 by the positioning column, and the axial limit of the rear cover assembly 4 and the sealing ring 3 can prevent the sealing ring 3 from moving during the operation of the blower, thereby improving the sealing stability of the sealing ring 3.

[0090] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A blower, comprising: A 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) comprises a mounting base, a stator assembly and a rotor assembly, the mounting base is formed with an assembly cavity, and at least a portion of the stator assembly and the rotor assembly are arranged in the assembly cavity; The heat dissipation plate (2) is connected to the motor body (1), and the heat dissipation plate (2) is provided with at least one connecting arm (23) The blower further comprises a vibration reduction unit (7), wherein the vibration reduction unit (7) comprises: A vibration-damping pad (5), the vibration-damping pad (5) being 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) being provided with an embedded groove (51) matching the shape of the connecting arm (23); the extending length of the embedded groove (51) along the circumference of the vibration-damping pad (5) being smaller than the circumference of the vibration-damping pad (5); the embedded groove (51) being used to accommodate 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) covering at least a portion of the outer circumference of the connecting arm (23); The vibration damping pad (5) is provided with a sleeve hole (52), the rear cover assembly (4) is provided with a sleeve column (422) which can be inserted into the sleeve hole (52), the vibration damping pad (5) is sleeved on the sleeve column (422) through the sleeve hole (52), and the inner wall of the sleeve hole (52) is provided with a first protrusion (53), at least a part of the first protrusion (53) corresponds to the position of the embedded groove (51) to compensate for the wall thickness of the vibration damping pad (5) where the embedded groove (51) is opened; A sealing ring (3), the sealing ring (3) being arranged around the heat dissipation plate (2); the outer wall of the sealing ring (3) is in contact with the rear cover assembly (4); the rear cover assembly (4) is of split design; The sealing ring (3) and the vibration-damping pad (5) are both made of flexible materials and can undergo elastic deformation when the rear cover assembly (4) and the heat sink (2) vibrate to absorb the vibration generated by the rear 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 a raised rib (55), the raised rib (55) extends along the length direction of the connecting arm (23), and the direction of the pressing force on the raised rib (55) is perpendicular to the length direction of the raised rib (55); Preferably, the number of the raised ribs (55) is multiple, and the multiple raised ribs (55) are arranged at intervals along the length direction of the connecting arm (23); Preferably, the vibration damping pad (5) is provided with a main body (56), the raised ribs (55) are formed by protruding from the main body (56) along the axial direction of the vibration damping pad (5), each of the raised ribs (55) is a long strip structure, the thickness of the raised ribs (55) in the axial direction is 0.1 to 0.2 times the thickness of the main body (56), and the width of the raised ribs (55) in the radial direction is 0.1 to 0.2 times the maximum width of the main body (56).

3. The blower according to claim 2, characterized in that: The thickness of the embedded 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 embedded groove (51) along the radial direction of the vibration damping pad (5) is at least 0.5 times the minimum spacing (D3) between the side surface of the main body (56) facing the connecting arm (23) and the inner wall of the main body (56) along the radial direction of the vibration damping pad (5); and / or, the side wall which surrounds and forms the embedded groove (51) and is parallel to the axial direction of the vibration-damping pad (5), has a thickness (D1) in the radial direction of the vibration-damping pad (5) of at least 0.5 times the minimum spacing (D3) between the side surface 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 vibration-damping pad (5); Preferably, the thickness of the first protrusion (53) is 1.5 to 2.5 times the thickness of the embedded groove (51).

4. The blower according to claim 3, characterized in that: The inner wall forming the sleeve hole (52) is provided with a second protrusion (54), the second protrusion (54) and the first protrusion (53) are arranged at intervals, and the second protrusion (54) and the first protrusion (53) are both in contact with the sleeve column (422) to centrally position the sleeve column (422).

5. The blower according to any one of claims 1 to 4, characterized in that: The vibration damping pad (5) and the sealing ring (3) are both made of 30-degree natural rubber.

6. The blower according to claim 1, characterized in that: The rear cover assembly (4) comprises a plate cover unit (42) having a sealing groove (421), at least a portion of the sealing ring (3) is accommodated in the sealing groove (421), and end ribs (36) are respectively provided at the upper and lower ends of the sealing ring (3). The sealing ring (3) abuts against the upper and lower walls of the sealing groove (421) formed in the plate cover unit (42) through a pair of the end ribs (36) to form an interference fit, and the end ribs (36) can be squeezed by the plate cover unit (42) to undergo elastic deformation to achieve axial vibration reduction; Preferably, at least a portion of the side wall of the sealing ring (3) is accommodated in the sealing groove (421) and forms a gap with the inner wall of the sealing groove (421) formed in the plate cover unit (42); When the sealing ring (3) and the plate cover unit (42) vibrate relative to each other in the radial direction, the side wall of the sealing ring (3) can abut against the inner wall forming the sealing groove (421) and undergo elastic deformation to fill the gap for radial vibration reduction.

7. The blower according to claim 1, characterized in that: The rear cover assembly (4) is disposed on the heat dissipation plate (2) and forms a receiving cavity (43) together with the heat dissipation plate (2); a circuit board (6) is received in the receiving cavity (43); Preferably, the sealing ring (3) is arranged at the connection between the rear cover assembly (4) and the heat dissipation plate (2) to form the accommodating cavity (43), so as to seal the accommodating cavity (43); Preferably, the rear cover assembly (4) comprises a rear cover (41), wherein the rear cover (41) is connected to the heat dissipation plate (2) and pressed against the sealing ring (3) so that the rear cover (41) and the sealing ring (3) are in close contact with each other and form a first sealing portion (33); Preferably, the rear cover assembly (4) further comprises a plate cover unit (42), the plate cover unit (42) being provided with a sealing groove (421), at least a portion of the sealing ring (3) being received in the sealing groove (421), and the upper end of the sealing ring (3) being in close contact with the upper wall forming the sealing groove (421) to form a second sealing portion (34), and the lower end of the sealing ring (3) being in close contact with the lower wall forming the sealing groove (421) to form a third sealing portion (35); Preferably, the third sealing portion (35), the second sealing portion (34) and the first sealing portion (33) sequentially block water vapor along the flow direction of the water vapor.

8. The blower according to claim 7, 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) is provided with a radially extending accommodating cavity (31), the accommodating cavity (31) comprising a first accommodating cavity (311) and a second accommodating cavity (312) which are interconnected, 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 the cross-sectional dimension of the first accommodating cavity (311) in the axial direction is larger than the cross-sectional dimension 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) and the sealing ring (3) is radially limited; Preferably, the length of the sealing ring (3) in the circumferential direction is smaller than the length of the edge protrusion (22), so that the sealing ring (3) is adapted to the heat dissipation plate (2) in an interference fit; Preferably, a plurality of positioning protrusions (211) are formed on the surface of the heat dissipation plate (2); the sealing ring (3) is also provided with a plurality of positioning accommodating cavities (32) adapted to the positioning protrusions (211); the positioning protrusions (211) are arranged in the positioning accommodating cavities (32) and form circumferential limit for the sealing ring (3); Preferably, the rear cover assembly (4) abuts against the sealing ring (3) and applies a pressing force along the axial direction of the heat sink (2) to the sealing ring (3) to form an axial limit for the sealing ring (3); Preferably, a grounding protrusion (24) is provided on a side of the heat dissipation plate (2) facing the circuit board (6), and the grounding protrusion (24) abuts against the circuit board (6) so that the circuit board (6) is grounded.

9. The blower according to claim 8, characterized in that: Four grounding protrusions (24) are provided, and the four grounding protrusions (24) are distributed in a ring array around the axis of the heat sink (2); Preferably, one end of the circuit board (6) is connected to a wire insertion portion (61), and after the rear cover assembly (4) is covered on the heat sink (2), the wire insertion portion (61) is respectively abutted against the rear cover assembly (4) and the circuit board (6) to lock the first end of the circuit board (6) relative to the heat sink (2), and the edge of the second end of the circuit board (6) is butted with a fastener (62) and the fastener (62) presses the circuit board (6) and then locks it relative to the heat sink (2), and the first end and the second end of the circuit board (6) are arranged opposite to each other; the wire insertion portion (61) and the fastener (62) apply a pressing force to the opposite ends of the circuit board (6) to lock the circuit board (6); Preferably, a positioning groove (63) is provided at the edge of the circuit board (6), and the heat sink (2) is provided with a limiting column (25) corresponding to the position of the positioning groove (63), and at least a part of the limiting column (25) is received in the positioning groove (63) and limits the circuit board (6); Preferably, the limiting column (25) is connected to a fastener (62), one end of the fastener (62) is formed with a pressing head (621), and the pressing head (621) of the fastener (62) can press the circuit board (6); a plurality of limiting columns (25) are provided, and the plurality of limiting columns (25) include at least two limiting columns (25) located at opposite ends of the circuit board (6); Preferably, the fastener (62) is located inside the accommodating cavity (43), or part or all of the fastener (62) is located outside the accommodating cavity and passes through the mounting hole on the rear cover assembly (4) to be connected to the limiting column (25); Preferably, a board surface (26) of the heat sink (2) facing the circuit board (6) forms a gap with the circuit board (6) through the provided grounding protrusion (24), and a heat-conducting medium is provided at one end of the circuit board (6) facing the heat sink (2), and the heat-conducting medium is filled at a preset position of the gap formed between the board surface (26) and the circuit board (6).

10. The blower according to claim 6, characterized in that The rear cover assembly (4) comprises a rear cover (41) and a plate cover unit (42); the plate cover unit (42) and the rear cover (41) are arranged separately, and the plate cover unit (42) can be detachably connected to the motor body (1) independently of the rear cover (41).

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