CN220667854U - Blower fan - Google Patents

Abstract

The utility model discloses a blower, which includes: a motor body, a heat dissipation plate and a back cover assembly covering the heat dissipation plate; the heat dissipation plate is provided with a connecting arm; the blower also includes a vibration reduction unit, and the vibration reduction unit includes: a vibration reduction pad, The vibration-absorbing pad covers the connecting arm and fits closely with the connecting arm. The outer wall of the vibration-absorbing pad is in contact with the back cover assembly; the sealing ring is surrounded by the heat sink; the outer wall of the sealing ring is in contact with the back cover assembly. Among them, the sealing ring and vibration-absorbing pad are made of flexible materials and can absorb the vibration generated by the back cover assembly and the heat sink. The utility model can use a sealing ring and a vibration-absorbing pad to simultaneously reduce vibration, increase the vibration-damping area, and improve the vibration-damping effect; at the same time, an embedded groove that matches the shape of the connecting arm is provided so that the vibration-damping pad can cover the connection The arm can fully bear the connecting arm and is not easily deformed.

Description

Blower

Technical field

The utility model relates to the field of fans, in particular to a blower.

Background technique

The blower is one of the components in new energy vehicles. The car blower drives the air flow through the rotation of the impeller, and sucks the air inside or outside the car into the blower. The air flow passes through the air duct and blows air to various locations, thereby dissipating heat and cooling the car.

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 provide vibration-absorbing pads at the connection between the connecting arm of the heat sink plate and the back cover assembly for vibration reduction; this method can only dampen vibration at the connecting arm of the heat sink plate, and the vibration reduction area is small. Moreover, the existing vibration-absorbing pad usually has an exposed annular groove on the outer wall of the vibration-absorbing pad, and the connecting arm of the heat sink is arranged in the annular groove. The connecting arm is exposed to the outside world, and the vibration-absorbing pad The connecting arm cannot fully bear the connection arm; and the vibration-absorbing pad of the annular groove is also easily deformed when the components of the blower are axially pressed onto the vibration-absorbing pad, resulting in poor vibration-absorbing effect. In addition, the vibration-absorbing pad needs to maintain the stability of its position during installation and work. However, due to the influence of deformation and other factors, the position cannot be effectively guaranteed, resulting in poor shock-absorbing effect.

Utility model content

In view of the shortcomings of the existing technology, the present utility model provides a blower, which uses a sealing ring and a vibration-absorbing pad to simultaneously dampen vibration, thereby increasing the damping area and improving the damping effect; at the same time, the blower is configured to match the shape of the connecting arm. The embedded groove allows the vibration-absorbing pad to cover the connecting arm to fully bear the connecting arm and not be easily deformed.

The utility model is realized through the following technical solutions:

A blower, including: a motor body, a heat dissipation plate connected to the motor body, and a back cover assembly covering the heat dissipation plate; the heat dissipation plate is provided with a connecting arm connected to the back cover assembly;

The motor body includes a mounting base, a stator assembly and a rotor assembly, the mounting base is formed with an assembly cavity, and at least part of the stator assembly and the rotor assembly are disposed in the assembly cavity;

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

The blower also includes a vibration reduction unit, which includes:

Vibration-absorbing pad, the vibration-absorbing pad is connected to the back cover assembly and the heat dissipation plate respectively to reduce the relative vibration between the back cover assembly and the heat dissipation plate; the vibration-absorbing pad is provided with the connecting arm An embedded groove of matching shape; the extension length of the embedded groove along the circumferential direction of the vibration-absorbing pad is less than the circumference of the vibration-absorbing pad, and the embedded groove is used to extend along the diameter of the vibration-absorbing pad. A vibration-absorbing pad that accommodates the connecting arm and forms the embedded groove covers at least a portion of the outer peripheral side of the connecting arm;

The vibration-absorbing pad is provided with a socket hole, and the back cover assembly is provided with a socket post that can be inserted into the socket hole. The vibration-absorbing pad is sleeved on the socket through the socket hole. The inner wall forming the socket 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 position where the damping pad opens the embedded groove. wall thickness;

A sealing ring, the sealing ring is sleeved around the heat sink plate; the outer wall of the sealing ring is in contact with the back cover assembly;

Wherein, the sealing ring and the vibration-absorbing pad are made of flexible materials and can elastically deform when the back cover assembly and the heat dissipation plate vibrate to absorb the vibrations generated by the back cover assembly and the heat dissipation plate.

Further, the vibration-absorbing 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 exerted by the raised ribs is consistent with the direction of the raised ribs. The length of the ribs is vertical.

Further, there are multiple protruding ribs, and the plurality of protruding ribs are spaced apart along the length direction of the connecting arm.

Further, the vibration-absorbing pad is provided with a main body part, and the convex ribs are formed by protruding from the main body part along the axial direction of the vibration-absorbing pad, and each of the convex ribs is in the shape of a 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 part, 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 part.

Further, the thickness of the embedded groove in the axial direction is 0.2 to 0.3 times the thickness of the main body part, and the depth of the embedded groove along the radial direction of the vibration damping pad is at least as deep as the main body part facing 0.5 times the minimum distance between the side of the connecting arm and the inner wall of the main body along the radial direction of the damping pad;

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

Further, the thickness of the first protrusion is 1.5 to 2.5 times the thickness of the embedded groove.

Further, the inner wall forming the socket hole is provided with a second protruding part, the second protruding part is spaced apart from the first protruding part, and the second protruding part is separated from the first protruding part. The protrusions are in contact with the socket posts to position the socket posts.

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

Further, the back cover assembly includes a plate cover unit with a sealing groove, at least a part of the sealing ring is accommodated in the sealing groove, and the upper and lower ends of the sealing ring are respectively provided with end ribs. The sealing ring The pair of end ribs are in contact with the upper and lower walls forming the sealing groove in the plate cover unit and form an interference match, and the end ribs can be extruded by the plate cover unit to elastically deform. Perform axial vibration reduction.

Further, at least a part 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;

When the sealing ring and the plate cover unit vibrate relative to each other in a radial direction, the side wall of the sealing ring can contact the inner wall forming the sealing groove and elastically deform to fill the gap for radial vibration damping. .

Further, the back cover assembly covers the heat dissipation plate and together with the heat dissipation plate forms an accommodating cavity; a circuit board is accommodated in the accommodating cavity.

Further, the sealing ring is provided at a connection between the back cover assembly and the heat dissipation plate to form the accommodation cavity, so as to seal the accommodation cavity.

Further, the back cover assembly includes a back cover, which is connected to the heat dissipation plate and pressed against the sealing ring so that the back cover and the sealing ring are in tight contact and form a first sealing part. .

Further, the back cover assembly further includes a plate cover unit, the plate cover unit is provided with a sealing groove, at least a part of the sealing ring is received in the sealing groove, and the upper end of the sealing ring forms the The upper wall of the sealing groove is in close contact and forms a second sealing part. The lower end of the sealing ring is in close contact with the lower wall forming the sealing groove and forms a third sealing part.

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 accommodation cavity, and the accommodation cavity includes a first accommodation cavity and a second accommodation cavity that communicate with each other. an accommodating cavity, 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 The cross-sectional size is larger than the second accommodation cavity so that the edge protrusion is clamped in the first accommodation cavity by the step surface and radially limits the sealing ring.

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 fits the heat dissipation plate in an interference fit.

Further, 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 provided in the positioning accommodating cavity. It forms a circumferential limit in the cavity and forms a circumferential limit on the sealing ring.

Further, the back cover assembly abuts the sealing ring and exerts a pressing force on the sealing ring in the axial direction of the heat dissipation plate to form an axial limit on the sealing ring.

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

Further, there are four grounding protrusions, and the four grounding protrusions are distributed in an annular array around the axis of the heat dissipation plate.

Further, one end of the circuit board is connected to a plug-in portion, and the plug-in portion is in contact with the back cover assembly and the circuit board respectively after the back cover assembly is covered on the heat sink. The first end of the circuit board is locked relative to the heat sink, the edge of the second end of the circuit board is connected with a fastener, and the fastener presses the circuit board and is locked relative to the heat sink. , the first end and the second end of the circuit board are arranged oppositely; the plug-in part and the fastener exert a pressing force on the opposite ends of the circuit board to lock the circuit board.

Further, the edge of the circuit board is provided with a positioning groove, and the heat sink is provided with a limiting column corresponding to the position of the positioning groove. At least a part of the limiting column is received in the positioning groove and limited. The circuit board.

Further, the limiting column is connected with a fastener, and one end of the fastener is formed with a compression head, and the compression head of the fastener can compress the circuit board; the limiting column is configured A plurality of limiting posts include at least two limiting posts located at opposite ends of the circuit board.

Further, the fasteners are located inside the accommodating cavity, or part or all of the fasteners are located outside the accommodating cavity and are connected to the limit after passing through the mounting holes on the back cover assembly. Bit post connection.

Further, the surface of the heat dissipation plate facing the circuit board forms a gap with the circuit board through the grounding protrusion, and a thermal conductive medium is provided at one end of the circuit board facing the heat dissipation plate. The thermally conductive medium is filled in a preset position of the gap formed between the board surface and the circuit board.

Further, the back cover assembly includes a back cover and a plate cover unit. The plate cover unit is separated from the back cover, and the plate cover unit is detachable independently of the back cover and the motor body. connect.

Compared with the existing technology, the advantages of this utility model are:

1. By setting up a vibration-damping unit composed of a vibration-damping pad and a sealing ring, the area of the vibration-damping area of the heat sink and the back cover assembly is increased, and the vibration-damping effect is improved; in addition, the connecting arm of the heat sink plate can be covered with the vibration-damping pad. The connecting arm is completely loaded and is not easily deformed; at the same time, the fit of the vibration-absorbing pad and the connecting arm also makes all surfaces of the vibration-absorbing pad used to carry the connecting arm evenly contact the connecting arm, ensuring balanced strength at each point on the bearing surface.

2. Use the edge protrusion of the heat sink plate to limit the radial position of the sealing ring, the positioning column to limit the circumferential position of the sealing ring, and the axial positioning of the back cover assembly and the sealing ring to prevent the sealing ring from shifting during the operation of the blower. movement to improve the stability of the sealing ring.

3. Apply pressing force to the opposite ends of the circuit board through the plug-in part and fasteners to lock the circuit board. There is no need to open a locking hole inside the circuit board, which effectively improves the space utilization of the circuit board.

Description of the drawings

Figure 1 is a schematic structural diagram of a blower according to a preferred embodiment of the present invention;

Figure 2 is a schematic structural diagram of the blower in Figure 1 from another perspective;

Figure 3 is a schematic structural diagram of the blower in Figure 1 after removing the plate cover unit;

Figure 4 is a partial structural diagram of the blower in Figure 1;

Figure 5 is a cross-sectional view of the E-E section in Figure 2;

Figure 6 is an enlarged view of circle A in Figure 5;

Figure 7 is a schematic cross-sectional view of the sealing ring;

Figure 8 is a sectional view of the F-F section in Figure 2;

Figure 9 is an enlarged view of circle B in Figure 8;

Figure 10 is a schematic structural diagram of the vibration damping pad;

Figure 11 is a plan cross-sectional view of the vibration-absorbing pad;

Figure 12 is an exploded view of part of the structure of the blower in Figure 1;

Figure 13 is a schematic structural diagram of another part of the blower in Figure 1;

Figure 14 is an exploded view of part of the structure in Figure 13;

Figure 15 is a partial structural diagram of Figure 13.

Detailed ways

The technical solutions of the utility model will be described in further non-limiting detail below in combination with the preferred embodiments and the accompanying drawings. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis" The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited. The embodiments described below with reference to the drawings are exemplary and intended to explain the present invention, but should not be understood as limiting the present invention.

As shown in Figures 1 to 15, a blower corresponding to the preferred embodiment of the present invention includes a motor body 1, a heat sink 2 connected to the motor body 1, a back cover assembly 4 covering the heat sink 2, Vibration damping unit 7 and circuit board 6 . The back cover assembly 4 and the heat sink 2 together form an accommodating cavity 43 that can be used to accommodate electrical components. The electrical components include a circuit board 6. The circuit board 6 is disposed in the accommodating cavity 43 and connected to the heat sink 2 to connect the circuits. The heat generated by the plate 6 is conducted to the heat dissipation plate 2 for heat dissipation. The vibration reduction unit 7 is connected to the back cover assembly 4 and the heat sink 2; when the motor body 1 is running, it will vibrate, causing the heat sink 2 connected to the motor body 1 and the back cover assembly 4 connected to the heat sink 2 to vibrate. The vibration of the back cover assembly 4 and the heat dissipation plate 2 is absorbed by the vibration reduction unit 7 connected with the back cover assembly 4 and the heat dissipation plate 2 to reduce the vibration of the blower of the present invention.

The motor body 1 includes a mounting base, a stator assembly and a rotor assembly. The mounting base forms an assembly cavity, at least part of the stator assembly and the rotor assembly are disposed in the assembly cavity, and the stator and rotor assembly are connected to the heat dissipation plate 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 part of the outside air flowing into the assembly cavity flows through the heat dissipation plate 2 to take away the heat of the heat dissipation plate 2 . The heat dissipation channel can be provided in the back cover assembly 4. For example, a cavity connecting the outside world and the assembly cavity is opened in the back cover assembly 4, so that the cavity forms a heat dissipation channel.

Referring further to FIG. 1 , the 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 covers the heat dissipation plate 2 and forms a receiving cavity 43 with the heat dissipation plate 2 that can be used to place electrical components. The back cover 41 has a through hole on its edge, and the heat dissipation plate 2 has a through hole with the back cover 41 . The back cover 41 and the heat dissipation plate 2 are connected to each other through screws that pass through the through holes and are threadedly connected to the heat dissipation plate 2 through the threaded holes. The plate cover unit 42 includes a plate cover 424 and a mounting flange 423 that are connected to each other. Further referring to FIG. 3 , the back cover 41 and the plate cover 424 in the existing back cover assembly 4 are mostly integrally formed. However, in actual use, some users may not understand the plate cover 424 in the back cover assembly 4 and the installation method. Lan 423 carries out its own design. In order to adapt to market demand, the back cover assembly 4 of the present utility model adopts a split plate cover unit 42 and a back cover 41, and the plate cover unit 42 can be detached independently of the back cover 41 and the motor body 1. connection, so that the blower of the present invention can be shipped as a single unit after the detachable plate cover unit 42. In addition, if the single machine after the plate cover unit 42 is removed fails, the single machine can be replaced separately without replacing the plate cover unit 42; and the single machine after the plate cover unit 42 is removed is smaller than the overall volume of the blower, and it is easier to ship the single machine. Can reduce shipping costs.

As shown in Figure 12, the vibration damping unit 7 includes a sealing ring 3 and a vibration damping pad 5 made of flexible materials. The material of the sealing ring 3 and the damping pad 5 is preferably made of thirty-degree natural rubber, so that the material of the sealing ring 3 and the damping pad 5 is softer, has better buffering effect and can effectively reduce the transmission of vibration; and thirty-degree natural rubber is used. The sealing ring 3 and the vibration-absorbing pad 5 made of high-quality natural rubber are not prone to edge warping after being compressed.

Referring further to FIGS. 9 and 10 , the vibration damping pad 5 is sleeved on the heat sink 2 , and the outer wall of the damping pad 5 is in contact with the back cover assembly 4 to dampen the vibration of the heat sink 2 and the back cover assembly 4 . Specifically, the heat dissipation plate 2 includes a main body 21 and a connecting arm 23 extending outward from the main body 21; the damping pad 5 covers at least part of the outer peripheral wall of the connecting arm 23. Specifically, the damping pad 5 covers the connecting arm. 23 extends from the side facing the damping pad 5 to at least a part of the connecting arm 23 in a direction away from the damping pad 5 . In order to improve the vibration 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. The embedded groove 51 is used to receive and connect the damping pad 5 in the radial direction. Arm 23. The extension length of the embedded groove 51 along the circumferential direction of the damping pad 5 is smaller than the circumferential length of the damping pad 5 . The vibration-absorbing pad 5 forming the embedded groove 51 covers the outer peripheral side of the connecting arm 23 and fits the connecting arm 23 . That is, the embedded groove 51 and the part of the connecting arm 23 covered by the vibration-absorbing pad 5 have the same shape. . In this way, the inner wall of the embedded groove 51 formed in the vibration-absorbing pad 5 is evenly attached to 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 dissipation plate 2 vibrates, it acts as a vibration damper. The force of the pad 5 can act uniformly on the inner wall surface that forms the embedded groove 51 in the vibration-absorbing pad 5 and is opposite to the direction of the impact force, ensuring that all points on the inner wall surface are evenly stressed, thereby improving the damping effect of the vibration-absorbing pad 5 on the heat dissipation plate 2. vibration effect. Moreover, the embedded groove 51 adapted to the connecting arm 23 can also make the connecting arm 23 closely fit in the radial direction when connected to the vibration damping pad 5, further improving the vibration damping effect of the vibration damping pad 5 on the heat dissipation plate 2. . In addition, by using the vibration-absorbing pad 5 with the embedded groove 51 to cover the connecting arm 23, the vibration-absorbing pad 5 can fully carry the connecting arm 23; and compared with the existing ones, the vibration-absorbing pad 5 of the present invention The annular groove carries the vibration-absorbing pad 5 of the connecting arm 23, which can prevent the vibration-absorbing pad 5 from being left vacant due to the annular groove not accommodating the connecting arm 23, causing the vibration-absorbing pad 5 to withstand the axis pressing force. Collapse deformation towards this vacant position.

Referring further to FIG. 11 , the embedded groove 51 is opened in the main body portion 56 of the vibration damping pad 5 . Specifically, the embedded groove 51 may 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 to 0.3 times the thickness of the main body 56 to prevent the embedded groove 51 from being thicker and affecting the damping effect of the vibration-absorbing pad 5 . A side wall is formed around the embedded groove 51 and is parallel to the axial direction of the damping pad 5. The thickness D1 along the radial direction of the damping pad 5 is at least the side wall of the main body 56 facing the connecting arm 23 and the main body 56 The inner wall is 0.5 times the minimum distance D3 along the radial direction of the damping pad 5; in order to avoid the thin side wall thickness of the part of the damping pad 5 used to cover the connecting arm 23 after the embedded groove 51 is opened, affecting the damping pad. 5. The covering effect of the connecting arm 23. Preferably, the depth D2 of the embedded groove 51 along the radial direction of the damping pad 5 can also be set to be at least the minimum distance 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 damping pad 5 . 0.5 times the distance D3; to ensure the depth of the vibration-absorbing pad 5 covering the connecting arm 23 and improve the covering effect of the vibration-absorbing pad 5 on the connecting arm 23. The open end of the embedded groove 51 is provided with an arc segment 511 and a flat segment 512. A pair of planar ends 512 is provided, and the pair of planar ends 512 is provided on opposite sides of the arc segment 511 .

The vibration damping pad 5 is connected to the heat dissipation plate 2 and is also connected to the back cover assembly 4 to dampen the vibration of the back cover assembly 4 at the same time. The plate cover assembly 42 in the back cover assembly 4 is formed with a receiving cavity 425 for receiving the vibration damping pad 5 .

The vibration damping pad 5 is arranged in the accommodation cavity 425, and one end of the vibration damping pad 5 is in contact with the plate cover 424, and the other end is in contact with the mounting flange 423, and the vibration absorption pad 5 is arranged between the side wall and the The plate cover assembly 42 abuts to increase the contact area between the shock absorbing pad 5 and the back cover assembly 4, thereby improving the vibration damping effect of the shock absorbing pad 5 on the back cover assembly 4. When the damping pad 5 is disposed in the accommodation cavity 425, it can be pre-compressed to improve the damping effect of the damping pad 5. The compression amount of the damping pad 5 is preferably 1.6%.

In addition, in order to facilitate the installation of the damping pad 5, the damping pad 5 is provided with a socket hole 52, and the back cover assembly 4 is provided with a socket post 422 that can be penetrated through the socket hole 52 so that the damper provided with the socket hole 52 can The vibration pad 5 can be placed on the back cover assembly 4 . Specifically, the socket post 422 specifically includes a first socket post 4221 provided on the mounting flange 423 and a second socket post 4222 provided on the plate cover 424. When the installation flange 423 is connected to the plate cover 424, the first socket post 4221 is disposed on the plate cover 424. The socket post 4221 and the second socket post 4222 abut and jointly form the socket post 422. The installation of the vibration damping pad 5 can be facilitated by providing the socket post 422 composed of the first socket post 4221 and the second socket post 4222.

Since the damping pad 5 is provided with both the socket hole 52 and the embedded groove 51, the side wall thickness between the embedded groove 51 and the socket hole 52 is thinner. In order to compensate for the reduced wall thickness due to the embedded groove 51, , the inner wall of the damping pad 5 forming the socket hole 52 is provided with a first protruding portion 53. At least a part of the first protruding portion 53 corresponds to the position of the embedded groove 51 to compensate for the vibration damping pad 5 when forming the embedded groove. The wall thickness of the groove 51; specifically, the first raised portion 53 can be slightly larger than the size of the embedded groove 51, that is, part of the first raised portion 53 corresponds to the position of the embedded groove 51, and the other part surrounds the embedded groove 51. The position of the embedded groove 51 corresponds to the first protruding portion 53 . 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 damping pad 5 due to the opening of the embedded groove 51 , thereby preventing the wall between the embedded groove 51 and the socket hole 52 in the damping pad 5 from collapsing and deforming due to its thin thickness. Case.

In order to facilitate the installation and positioning of the vibration damping pad 5, the inner wall forming the socket 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, and the second protruding part 54 is spaced apart and opposite to the first protruding part 53. Both the two protruding parts 54 and the first protruding part 53 can contact with the socket post 422 , and the arcuate surfaces of the first and second protrusion parts 53 and the socket post 422 are all in contact with the socket post 422 . The curvatures of the outer walls of the connecting posts 422 are the same, and the centers of the arcuate surfaces of the first protruding portion 53 and the second protruding portion 54 contacting the connecting posts 422 are located on the central axis of the shock absorbing pad 5, so that the first The protruding portion 53 and the second protruding portion 54 can centrally position the socket post 422 .

In order to firmly connect the damping pad 5 to the back cover assembly 4, the back cover assembly 4 is also provided with screws that connect the first socket post 4221 and the second socket post 4222 in sequence. Among them, the first socket post 4221 is provided with a through hole, and the second socket post 4222 is provided with a threaded hole, so that screws can be passed through the first socket post 4221 and threadedly connected with the second socket post 4222 to connect the reducer. The vibration pad 5 is locked between the plate cover 424 and the mounting flange 423, and screws can also achieve a fixed connection between the plate cover 424 and the mounting flange 423.

Preferably, the upper and lower ends of the damping pad 5 are also provided with raised ribs 55 , the raised ribs 55 extend along the radial direction of the damping pad 5 , and the direction of the pressing force exerted on the raised ribs 55 is parallel to the damping force. The axis direction of the vibrating pad 5. Among them, the raised ribs 55 are formed by protruding from the main body 56 along the axial direction of the damping pad 5. The raised ribs 55 at the upper and lower ends of the damping pad 5 are connected with the plate covers 424 and 424 located at the upper and lower sides of the damping pad 5. The mounting flange 423 is in contact, so the damping pad 5 is connected to the rear cover assembly 4 and bears the vertical press-fitting force exerted from the plate cover 424 and the mounting flange 423 , and the press-fitting force is proportional to the length of the protruding ribs 55 The direction is vertical. It is preferable to provide a plurality of raised ribs 55 , the plurality of raised ribs 55 are spaced apart, and the extension direction of each raised 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 located at the same end are equally spaced so that the stress of each protruding rib 55 is balanced. The existing vibration-absorbing pad 5 has an exposed annular groove so that the connecting arm has unlimited circumferential position when connected to the existing vibration-absorbing pad. As a result, the position of the raised ribs on the surface of the existing vibration-absorbing pad cannot be unique, and multiple use will be required. The protruding ribs are circumferentially distributed in an annular manner. Therefore, the direction of the stress of the existing protruding ribs of the vibration damping pad changes when subjected to the press-fitting force, which may easily cause uneven stress on the various protruding ribs of the vibration damping pad. . The raised ribs 55 of the damping pad 5 of the present invention adopt a structure extending along the radial direction of the damping pad 5 , so that the stress direction of each raised rib 55 is unique and the force is relatively balanced. In a preferred embodiment, the extension direction of each protruding rib 55 is consistent with the length direction of the connecting arm 23 .

Wherein, the protruding ribs 55 may be formed by extending along a guide line; for example, the protruding ribs 55 may extend along a linear guide line to form a long strip structure, or extend along a curved guide line to form a curved structure. Or extend along the guide line of a fold to form a fold structure, etc. Specifically, in this embodiment, the protruding ribs 55 can be used to extend along a linear guide line to form a long strip structure, and the thickness of the protruding ribs 55 is 0.1 to 0.2 times the thickness of the main body 56. The width is 0.1 to 0.2 times the maximum width of the main body 56 . In addition, when the raised ribs 55 adopt other forms such as a curved structure, a folded structure, etc., the thickness of the raised ribs 55 and the width of the cross section of the raised ribs 55 can be the same as those of the long strip-shaped raised ribs. 55 is the same.

Furthermore, when the shock absorbing pad 5 absorbs the vibration from the heat sink 2 and the back cover assembly 4, it will be intermittently squeezed by the heat sink 2 and the back cover assembly 4 and continuously compressed and released. In order to compensate for the shock absorbing pad 5 5 is released, a gap is formed between the inner wall of the damping pad 5 and the socket post 422. Specifically, the bulge formed on the inner wall of the damping pad 5 extends toward the socket post 422 and contacts the socket post 422 to prevent the vibration damping pad 5 from shaking after it is sleeved on the socket post 422. The inside of the damping pad 5 The remaining portion of the wall maintains a gap with the sleeve post 422 so that when the compression of the shock absorbing pad 5 is released, the gap can compensate for the deformation release of the shock absorbing pad 5 .

Referring further to Figures 6, 7 and 15, the sealing ring 3 is sleeved around the heat sink 2, and the length of the sealing ring 3 in the circumferential direction can be smaller than the length of the edge protrusion 22 of the heat sink 2, so that the sealing ring 3 can Interference fit with the heat sink 2 improves the sealing effect between the sealing ring 3 and the heat sink 2 . The sealing ring 3 has a notch 38 to avoid the vibration-absorbing pad 5; and the outer wall of the sealing ring 3 is in contact with the back cover assembly 4 to reduce the relative vibration between the back cover assembly 4 and the heat dissipation plate 2. Specifically, the plate cover unit 42 in the back cover assembly 4 is formed with a sealing groove 421, and a part of the sealing ring 3 is disposed in the sealing groove 421 and abuts against the plate cover unit 42; wherein, the plate cover unit 42 includes a sealing groove 421 for surrounding the plate cover unit 42. The upper and lower walls of the sealing groove 421 and the inner wall connecting the upper and lower walls are formed. The upper and lower walls and the inner wall together form a sealing groove 421 with an opening, and the sealing ring 3 is loaded into the sealing groove 421 through the opening. Through the joint damping of the sealing ring 3 and the vibration-absorbing pad 5 , in addition to the vibration damping at the connecting arm 23 by the vibration-damping pad 5 between the heat sink 2 and the back cover assembly 4 , the sealing ring surrounding the heat sink 2 3 You can also dampen the heat sink 2 and the back cover assembly 4 to increase the damping area to improve the damping effect of the damping unit 7; and surround the heat sink 2 with the sealing ring 3 and attach the damping pad 5 The arrangement at the notch 38 of the sealing ring 3 can also make the installation positions of the sealing ring 3 and the vibration damping pad 5 more reasonable. Focusing on FIG. 6 , it is worth noting that a shock-absorbing clearance 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 . There will be no interference during the process, and there will be no mutual vibration influence between the two.

The upper and lower ends of the sealing ring 3 are respectively provided with end ribs 36. The sealing ring 3 contacts the upper and lower walls forming the sealing groove 421 through a pair of end ribs 36 at the upper and lower ends to form an interference match and can pass through the sealing groove 421. The upper and lower walls flatten the end ribs 36 of the sealing ring 3 to dampen 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 heat dissipation. Noise generated when the plate 2 or the plate cover unit 42 vibrates. Among them, the compression amount of the sealing ring 3 is preferably 7.5%.

In addition, at least a part of the side wall of the sealing ring 3 is received 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 vibrate relative to each other in the radial direction, the side wall of the sealing ring 3 It can be in contact with the inner wall of the sealing groove 421 formed in the plate cover unit 42 and elastically deform to fill the above gap for radial vibration damping.

In addition to damping the vibration of the heat dissipation plate 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 devices in the accommodating cavity 43 . At least a part of the sealing ring 3 is disposed at the connection between the back cover assembly 4 and the heat dissipation plate 2 to form the accommodating cavity 43 to seal the accommodating cavity 43 .

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 in close contact with the upper wall forming the sealing groove 421 and forms the second sealing portion 34. The lower end of the sealing ring 3 is in close contact with the lower wall forming the sealing groove 421 and forms a second sealing portion 34. The 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 accommodation cavity 43 ; the second sealing part 34 can assist the third sealing part 35 This prevents water vapor in the motor body 1 from entering the accommodating 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 for sealing again through 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 and the sealing ring 3 are in tight contact and form the first sealing portion 33 . The first sealing part 33 can effectively prevent water vapor between the back cover 41 and the plate cover 424 from entering the accommodating cavity 43 . Among them, the third sealing part 35, the second sealing part 34 and the first sealing part 33 sequentially block water vapor along the flow direction of the water vapor, achieving a three-level sealing of water vapor, so that basically no water vapor enters the accommodation cavity 43, and the protection The electrical devices in the accommodating cavity 43 are not damaged by water vapor.

In order to prevent the sealing ring 3 from shaking during use of the blower, the utility model limits the sealing ring 3 in the axial, circumferential and radial directions to prevent the sealing ring 3 from shaking.

Among them, the sealing ring 3 is adapted and connected with the heat sink 2 to form a radial limit; specifically, the heat sink 2 includes a main body part 21 and an edge protrusion 22 provided on the edge of the main body part 21 and extending along the axial direction of the heat sink 2; The sealing ring 3 is provided with an edge protrusion 22 extending axially along the heat sink 2 . The sealing ring 3 is provided with a radially extending accommodation cavity 31. The accommodation cavity 31 includes a first accommodation cavity 311 and a second accommodation cavity 312 that communicate with each other, and a step is formed at the connection between the first accommodation cavity 311 and the second accommodation cavity 312. Face 313. The first accommodating cavity 311 is adapted to the edge protrusion 22 and can be used to accommodate the edge protrusion 22 . The second accommodating cavity 312 is adapted to the main body part 21 of the heat sink 2 and can accommodate part of the structure of the main part 21 in the second accommodating cavity 311 . inside the accommodation cavity 312. The cross-sectional size of the first accommodating cavity 311 is larger than the cross-sectional size 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 radially limit the sealing ring 3 .

In addition, further referring to Figure 14, a plurality of positioning protrusions 211 are formed on the surface of the main body 21 of the heat sink 2; the sealing ring 3 is also provided with a plurality of positioning accommodation cavities 32 that match the positioning protrusions 211, and there are 3 sets of sealing rings. When provided on the heat sink 2 , the positioning protrusion 211 is disposed in the positioning accommodating cavity 32 and limits the inner wall forming the positioning accommodating cavity 32 so that the positioning protrusion 211 forms a circumferential limit to the sealing ring 3 .

At the same time, in addition to the back cover 41 in the back cover assembly 4 being in contact with the sealing ring 3 to form the first sealing portion 33, the back cover 41 can also press the sealing ring 3 along the axial direction of the heat sink 2 to compress the sealing ring 3. The sealing ring 3 is tightened and the sealing ring 3 is axially limited.

Referring further to FIGS. 12 to 15 , the electrical components provided in the accommodating cavity 43 include the 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 placed 10mm from the edge of the hole position of 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, in the present utility model, the heat dissipation plate 2 faces one side of the circuit board 6 A grounding protrusion 24 is provided on the side, and the grounding protrusion 24 abuts the circuit board 6 so that the circuit board 6 is grounded; compared with the existing circuit board 6, four screws penetrated through the circuit board 6 are used to achieve grounding. The new circuit board 6 does not need to open holes for screws to pass through, which effectively improves the space utilization of the circuit board 6 . Among them, four grounding protrusions 24 are preferably provided, and the four grounding protrusions 24 are distributed in an annular array around the axis of the heat sink 2; the four grounding protrusions 24 are in contact with the circuit board 6 so that the circuit board 6 can be grounded at the same time. The circuit board 6 can also be supported so that a gap is formed between the circuit board 6 and the surface 26 of the heat dissipation plate 2 facing the circuit board 6 .

In order to facilitate heat dissipation of the circuit board 6 , a heat conductive medium is provided on the side of the circuit board 6 facing the heat dissipation plate 2 , and the heat conductive medium is filled in a predetermined 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 where the heat is mainly generated during the work 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 has a pasty structure. When the circuit board 6 is connected to the heat sink 2, the pasty heat-conducting medium can be affected by the circuit. The board 6 and the heat sink 2 are extruded to tightly contact 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 can pass through the heat-conducting medium. Conducted to heat sink 2. Among them, the thermal conductive medium is specifically thermal conductive mud.

In order to further improve the space utilization 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 contacts 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 tight The fastener 62 can compress the circuit board 6 . The plug-in portion 61 and the fastener 62 exert a pressing force on the opposite ends of the circuit board 6 to lock the circuit board 6 . It is worth noting that the plug-in part 61 contacts the back cover assembly 4 after the back cover assembly 4 is covered on the heat sink 2. The back cover assembly has a pressing action on the plug-in part 61, and the plug-in part can press the plug-in part 61. Tighten the circuit board 6. Among them, the plug-in portion 61 is provided at an end of the circuit board 6 away from the heat sink 2, and the plug-in portion 61 contacts the back cover assembly 4 and the circuit board 6 respectively after the back cover assembly 4 is covered on the heat sink 2. A pressing force is applied to the circuit board 6 toward the heat sink 2 . By locking the circuit board 6 with the plug-in portion 61 and the fastener 62, there is no need to open a hole in the circuit board 6 for the locking screw to penetrate, thereby improving the space utilization of the circuit board 6.

In order to position the circuit board 6 , the edge of the circuit board 6 is provided with a positioning groove 63 , and the heat sink 2 is provided with a limiting post 25 corresponding to the position of the positioning groove 63 . When the circuit board 6 is connected to the heat sink 2 , at least a part of the limiting post 25 is received in the positioning groove 63 and abuts against the side wall forming the positioning groove 63 to limit the circuit board 6 . Specifically, multiple limiting posts 25 are provided, and the plurality of limiting posts 25 include at least two limiting posts 25 located at opposite ends of the circuit board 6 , and two limiting posts 25 located at opposite ends of the circuit board 6 . The fasteners 62 located at the opposite end of the circuit board 6 and the plug-in portion 61 are distributed in a rhombus-shaped four corners. Among them, there are three limiting posts 25. One of the three limiting posts 25 is connected to the fastener 62 located at the opposite end of the circuit board 6 and the plug-in part 61, and the remaining two limiting posts 25 are located on the circuit board. 6, the two sides adjacent to the side of the connecting plug portion 61. Preferably, the three limiting posts 25 are all connected with fasteners 62 , wherein the fasteners 62 are provided with pressing heads 621 that can abut against the circuit board 6 and compress the circuit board 6 . The fastener 62 is specifically a screw. The limiting post 25 is provided with a threaded hole. The threaded post of the screw is threadedly connected to the limiting post 25 . The screw head of the screw presses the circuit board 6 to stabilize the circuit board 6 . It is worth noting that in one possible implementation, the screw is located inside the accommodating cavity 43 and is threadedly connected to the limiting column 25 so that the screw head of the screw presses the circuit board 6 to stabilize the circuit board 6 . In another possible implementation, some or all of the screws are located outside the accommodating cavity 43. The screws first pass through the mounting holes on the back cover assembly 4 and then are threadedly connected to the limiting posts 25. At this time, the installation on the back cover assembly 4 The structure at the hole can contact and compress the circuit board 6 to achieve the effect of stabilizing the circuit board 6 .

When in use, the motor body runs and causes the heat sink 2 and the back cover assembly 4 to vibrate. The sealing ring 3 and the vibration damping pad 5 connected to the heat sink 2 and the back cover assembly 4 absorb and reduce the heat sink 2 and the back cover assembly through their own elasticity. Vibration of cover assembly 4. The sealing ring 3 also forms three sealing parts with the back cover assembly 4 to prevent water vapor from entering the accommodation cavity 43 . The circuit board 6 is pressed and fixed by the fasteners 62 and the plug-in portion 61 and conducts heat to the heat dissipation plate 2 through thermal conductive mud to achieve heat dissipation. By arranging the vibration damping unit 7 composed of the vibration damping pad 5 and the sealing ring 3, the area of the vibration damping place of the heat sink 2 and the back cover assembly 4 is increased, and the vibration damping effect is improved; and the vibration damping pad 5 is wrapped on the heat sink The connecting arm 23 of 2 can completely carry the connecting arm 23 and is not easily deformed; at the same time, the vibration-absorbing pad 5 and the connecting arm 23 fit together so that all sides of the vibration-absorbing pad 5 used to carry the connecting arm 23 are evenly matched with the connecting arm 23 Contact to ensure balanced strength at each point on the load-bearing surface. By applying a pressing force to the opposite ends of the circuit board 6 through the plug-in portion 61 and the fastener 62 to lock the circuit board 6, there is no need to open a locking hole inside the circuit board 6, which effectively improves the space utilization of the circuit board 6. Rate. Through the radial limitation of the sealing ring 3 by the edge protrusion 22 of the heat sink 2, the circumferential limitation of the sealing ring 3 by the positioning column, and the axial limitation of the back cover assembly 4 and the sealing ring 3, the sealing ring 3 is prevented from being in the blower. Movement occurs during operation, which improves the sealing stability of the sealing ring 3.

The above-mentioned embodiments only express several implementation modes of the present invention. The descriptions are relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present utility model, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the utility model patent should be determined by the appended claims.

Claims (27)

1. A blower, comprising: a motor body (1), a heat dissipation plate (2) connected with the motor body (1), and a rear cover assembly (4) covered on the heat dissipation plate (2); the heat dissipation plate (2) is provided with a connecting arm (23) connected with the rear cover assembly (4); it is characterized in that the method comprises the steps of,

the motor body (1) comprises a mounting base, a stator assembly and a rotor assembly, wherein the mounting base is provided with an assembly cavity, and at least one part of the stator assembly and the rotor assembly is arranged in the assembly cavity;

radiating plate (2) the radiating plate (2) is connected with the motor body (1), and the radiating plate (2) is provided with at least one connecting arm (23)

The blower further comprises a vibration damping unit (7), the vibration damping unit (7) comprising:

a vibration reduction pad (5), the vibration reduction pad (5) being connected with the rear cover assembly (4) and the heat dissipation plate (2) respectively to reduce relative vibration between the rear cover assembly (4) and the heat dissipation plate (2); the vibration reduction pad (5) is provided with an embedded groove (51) which is matched with the shape of the connecting arm (23); the length of the embedded groove (51) along the circumferential direction of the vibration reduction pad (5) is smaller than the circumference of the vibration reduction pad (5), the embedded groove (51) is used for accommodating the connecting arm (23) along the radial direction of the vibration reduction pad (5), and the vibration reduction pad (5) forming the embedded groove (51) is coated on the outer circumferential side of at least one part of the connecting arm (23);

the vibration reduction pad (5) is provided with a sleeving hole (52), the rear cover assembly (4) is provided with a sleeving column (422) which can be penetrated through the sleeving hole (52), the vibration reduction pad (5) is sleeved on the sleeving column (422) through the sleeving hole (52), a first protruding part (53) is arranged on the inner wall of the sleeving hole (52), and at least one part of the first protruding part (53) corresponds to the position of the embedded groove (51) so as to compensate the wall thickness of the position, where the embedded groove (51) is formed, of the vibration reduction pad (5);

The sealing ring (3) is sleeved on the heat dissipation plate (2) in a surrounding mode; the outer wall of the sealing ring (3) is abutted with the rear cover assembly (4);

the sealing ring (3) and the vibration reduction pad (5) are made of flexible materials, and can elastically deform when the rear cover assembly (4) and the heat dissipation plate (2) vibrate so as to absorb the vibration generated by the rear cover assembly (4) and the heat dissipation plate (2).

2. A blower according to claim 1, characterized in that the vibration damping pad (5) is provided with a protruding rib (55), the protruding rib (55) extends in the longitudinal direction of the connecting arm (23), and the direction in which the protruding rib (55) is pressed is perpendicular to the longitudinal direction of the protruding rib (55).

3. The blower according to claim 2, wherein a plurality of the protruding ribs (55) are provided, and a plurality of the protruding ribs (55) are provided at intervals along the length direction of the connection arm (23).

4. A blower according to claim 2, wherein the damper pad (5) is provided with a main body portion (56), the protruding ribs (55) are formed protruding from the main body portion (56) in the axial direction of the damper pad (5), each protruding rib (55) is of a strip-like structure, the thickness of the protruding ribs (55) in the axial direction is 0.1 to 0.2 times the thickness of the main body portion (56), and the width of the protruding ribs (55) in the radial direction is 0.1 to 0.2 times the maximum width of the main body portion (56).

5. A blower according to claim 4, wherein the thickness of the embedded groove (51) in the axial direction is 0.2-0.3 times the thickness of the main body portion (56), and the depth (D2) of the embedded groove (51) in the radial direction of the damper pad (5) is at least 0.5 times the minimum distance (D3) between the side of the main body portion (56) facing the connecting arm (23) and the inner wall of the main body portion (56) in the radial direction of the damper pad (5);

and/or, a side wall which is parallel to the axial direction of the vibration-damping pad (5) and forms the embedded groove (51) is surrounded, and the thickness (D1) along the radial direction of the vibration-damping pad (5) is at least 0.5 times of the minimum distance (D3) between the side surface of the main body part (56) facing the connecting arm (23) and the inner wall of the main body part (56) along the radial direction of the vibration-damping pad (5).

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

7. The blower according to claim 5, wherein an inner wall forming the socket hole (52) is provided with a second boss (54), the second boss (54) is disposed at an interval from the first boss (53), and the second boss (54) and the first boss (53) are both abutted with the socket post (422) to center the socket post (422).

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

9. The blower according to claim 1, wherein the rear cover assembly (4) includes a plate cover unit (42) provided with a seal groove (421), at least a portion of the seal ring (3) is accommodated in the seal groove (421), end ribs (36) are respectively provided at upper and lower ends of the seal ring (3), the seal ring (3) abuts against upper and lower walls forming the seal groove (421) in the plate cover unit (42) through a pair of the end ribs (36) and forms interference fit, and the end ribs (36) can be elastically deformed by the plate cover unit (42) to perform axial vibration damping.

10. The blower according to claim 9, wherein at least a portion of a side wall of the seal ring (3) is housed in the seal groove (421) and forms a gap with an inner wall forming the seal groove (421) in the plate cover unit (42);

when the sealing ring (3) and the plate cover unit (42) vibrate relatively radially, the side wall of the sealing ring (3) can be abutted against the inner wall forming the sealing groove (421) and elastically deformed to fill the gap for radial vibration reduction.

11. A blower according to claim 1, wherein the rear cover assembly (4) is provided to cover the heat radiating plate (2) and forms a receiving chamber (43) together with the heat radiating plate (2); the circuit board (6) is accommodated in the accommodating cavity (43).

12. A blower according to claim 11, wherein the sealing ring (3) is provided at a junction of the rear cover assembly (4) and the heat radiating plate (2) to form the accommodating chamber (43) to seal the accommodating chamber (43).

13. A blower according to claim 11, wherein the rear cover assembly (4) includes a rear cover (41), the rear cover (41) being connected to the heat radiating plate (2) and pressed against the seal ring (3) so that the rear cover (41) closely abuts the seal ring (3) and forms a first seal portion (33).

14. The blower according to claim 13, wherein the rear cover assembly (4) further includes a plate cover unit (42), the plate cover unit (42) is provided with a seal groove (421), at least a portion of the seal ring (3) is accommodated in the seal groove (421), and an upper end of the seal ring (3) is in close contact with an upper wall forming the seal groove (421) and forms a second seal portion (34), and a lower end of the seal ring (3) is in close contact with a lower wall forming the seal groove (421) and forms a third seal portion (35).

15. The blower according to claim 14, wherein the third seal (35), the second seal (34) and the first seal (33) are sequentially moisture-blocking in the flow direction of the moisture.

16. A blower according to claim 14, characterized in that the edge of the heat-radiating plate (2) is provided with an edge projection (22) extending in the axial direction of the heat-radiating plate (2); the sealing ring (3) is provided with a radially extending accommodating cavity (31), the accommodating cavity (31) comprises a first accommodating cavity (311) and a second accommodating cavity (312) which are communicated with each other, and a step surface (313) is formed at the joint of the first accommodating cavity (311) and the second accommodating cavity (312); the first accommodating cavity (311) is matched with the edge protrusion (22), and the cross-sectional size of the first accommodating cavity (311) in the axial direction 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) and radially limits the sealing ring (3).

17. A blower according to claim 16, characterized in that the length of the sealing ring (3) in the circumferential direction is smaller than the length of the edge projection (22), so that the sealing ring (3) fits with the heat dissipation plate (2) with an interference fit.

18. A blower according to claim 13, characterized in that a surface of the heat radiation plate (2) is formed with a plurality of positioning projections (211); the sealing ring (3) is further provided with a plurality of positioning accommodating cavities (32) which are matched with the positioning protrusions (211), and the positioning protrusions (211) are arranged in the positioning accommodating cavities (32) and form circumferential limiting for the sealing ring (3).

19. A blower according to claim 18, characterized in that the rear cover assembly (4) abuts against the seal ring (3) and applies a pressing force in the axial direction of the heat radiation plate (2) to the seal ring (3) to form an axial limit for the seal ring (3).

20. A blower according to claim 12, characterized in that a side of the heat radiation plate (2) facing the wiring board (6) is provided with a grounding protrusion (24), the grounding protrusion (24) abutting against the wiring board (6) to ground the wiring board (6).

21. A blower according to claim 20, characterized in that the grounding protrusions (24) are provided in four, four of the grounding protrusions (24) being distributed in a circular array around the axis of the heat radiation plate (2).

22. The blower according to claim 20, wherein one end of the circuit board (6) is connected with a wire insertion portion (61), the wire insertion portion (61) is respectively abutted against the rear cover assembly (4) and the circuit board (6) after the rear cover assembly (4) is covered on the heat dissipation plate (2) so as to lock the first end of the circuit board (6) relative to the heat dissipation plate (2), a fastener (62) is abutted to an edge of the second end of the circuit board (6), the fastener (62) is locked relative to the heat dissipation plate (2) after pressing the circuit board (6), and the first end and the second end of the circuit board (6) are oppositely arranged; the wire insertion portion (61) and the fastener (62) apply pressing forces to opposite ends of the circuit board (6) to lock the circuit board (6).

23. The blower according to claim 20, wherein a positioning groove (63) is provided at an edge of the circuit board (6), the heat radiating plate (2) is provided with a stopper post (25) corresponding to the positioning groove (63), and at least a part of the stopper post (25) is accommodated in the positioning groove (63) and restricts the circuit board (6).

24. The blower according to claim 23, wherein the stopper post (25) is connected with a fastener (62), a pressing head (621) is formed at one end of the fastener (62), and the pressing head (621) of the fastener (62) can press the circuit board (6); the limiting columns (25) are arranged in a plurality, and the limiting columns (25) at least comprise two limiting columns (25) positioned at two opposite ends of the circuit board (6).

25. A blower according to claim 24, wherein the fastener (62) is located inside the receiving chamber (43), or part or all of the fastener (62) is located outside the receiving chamber and is connected to the stopper post (25) after passing through a mounting hole in the rear cover assembly (4).

26. A blower according to any one of claims 20-25, characterized in that a plate surface (26) of the heat radiation plate (2) facing the wiring board (6) is formed with a gap with the wiring board (6) through the grounding projection (24) provided, an end of the wiring board (6) facing the heat radiation plate (2) is provided with a heat-conducting medium, and the heat-conducting medium fills at a preset position of the gap formed between the plate surface (26) and the wiring board (6).

27. A blower according to claim 9, characterized in that the rear cover assembly (4) includes a rear cover (41) and a plate cover unit (42), the plate cover unit (42) being provided separately from the rear cover (41), and the plate cover unit (42) being detachably connectable to the motor body (1) independently of the rear cover (41).