Direct-current centrifugal fan

Abstract

The utility model discloses a direct-current centrifugal fan which comprises a fan body. The fan body comprises a base, a shell and a rear cover, centrifugal fan blades are fixed to a first cavity, and a second cavity is of a closed structure. The stator assembly is accommodated in the second cavity; the stator assembly is provided with a first channel and comprises a coil; the circuit board is accommodated in the second cavity and is provided with a heating element; the rotor is contained in the second cavity, one end of the rotor penetrates through the first channel to be in linkage with the centrifugal fan blade, and the other end of the rotor extends towards the rear cover. The rear cover is made of a heat conduction material and provided with a heat dissipation column, and the heat dissipation column extends to abut against the heating element. Through the closed structure of the second cavity, the overall protection grade is improved, dust and liquid are not prone to entering the second cavity, the rear cover is made of a heat conduction material, the rotor extends towards the rear cover to form a certain heat conduction effect, the heat dissipation columns abut against the heating element to form heat dissipation of the circuit board, and the heat conduction effect is formed through the rear cover. And interaction of internal and external heat is formed, so that the cooling effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a direct current centrifugal fan. Background Art

[0002] Centrifugal fans can introduce air or gas, accelerate it, and finally discharge it through the rotation of centrifugal blades. At present, the rotation speed of centrifugal fans is controlled by circuit boards, and different rotation speeds can be selected. The circuit board will generate a lot of heat during the control process and the rotor will generate a lot of heat during the rotation process. If the heat is not discharged to the outside of the centrifugal fan in time, it will cause the loss of internal parts and affect the service life of the entire centrifugal fan.

[0003] In the prior art, there is a method of setting heat dissipation holes on the casing of the centrifugal fan, and forming an interaction between the heat dissipation holes and the outside to achieve a heat dissipation effect. However, the problem with this structure is that it cannot achieve a dustproof and waterproof effect, and dust or liquid can easily enter the centrifugal fan through the heat dissipation holes, which will affect the normal operation of the centrifugal fan. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is how to achieve the heat dissipation effect while improving the protection level. To this end, a DC centrifugal fan comprises:

[0005] The fan body comprises a base, a shell, and a rear cover, wherein the base and the shell cooperate to form a first chamber, and the shell and the rear cover cooperate to form a second chamber, wherein a centrifugal fan blade is fixed to the first chamber, and an air duct is provided in the first chamber, and the second chamber is a closed structure, and a threading hole communicating with the outside is provided in the second chamber;

[0006] A stator assembly, the stator assembly is accommodated in the second chamber; the stator assembly is provided with a first channel, the stator assembly includes a plurality of coils, and the coils are distributed in a circumferential array;

[0007] A circuit board, the circuit board is accommodated in the second chamber, the circuit board is electrically connected to the coil, the circuit board is provided with a plurality of heating elements, and the surfaces of the heating elements are coated with thermal conductive silicone grease;

[0008] A rotor, the rotor is accommodated in the second chamber, one end of the rotor passes through the first channel and extends to the first chamber to be linked with the centrifugal fan blade, and the other end of the rotor extends toward the rear cover;

[0009] The back cover is made of heat-conducting material and is provided with a heat-dissipating column, which extends to abut against the heating element.

[0010] The circuit board is connected and fixed to the stator assembly.

[0011] The stator assembly includes a main body and a coil frame, wherein the coil frame is connected to the main body, and the coil is wound around the coil frame and the main body.

[0012] The coil frame and the circuit board are connected by hooks or bolts.

[0013] One of the main body and the second chamber is provided with a positioning groove, and the other of the main body and the second chamber is provided with a positioning protrusion matched with the positioning groove.

[0014] The main body is provided with a plurality of fixing parts, the fixing parts are T-shaped, the coil frame comprises an upper coil frame and a lower coil frame, the upper coil frame is sleeved above the fixing parts, the lower coil frame is sleeved below the fixing parts, and the coil is wound around the upper coil frame, the fixing parts and the lower coil frame.

[0015] The lower coil frame is provided with a lower support leg, the second chamber is provided with a plurality of limiting protrusions, and the lower support leg is located between two adjacent limiting protrusions.

[0016] The rotor is a plastic magnetic rotor.

[0017] It also includes at least two bearings, one of which is connected to the rear cover, and one of which is connected to the housing, and two ends of the rotor pass through the corresponding bearings respectively.

[0018] The imaginary center line of the air duct is an Archimedean spiral curve.

[0019] The technical solution of the utility model has the following advantages:

[0020] 1. The utility model provides a DC centrifugal fan, which adopts this structure. First, a closed second chamber is formed by the cooperation between the rear cover and the outer shell, which improves the overall protection level and makes it difficult for dust and liquid to enter the second chamber. Secondly, the rear cover is made of heat-conducting material, and the rotor extends toward the rear cover to form a certain heat-conducting effect. The heat dissipation column and the heating element are offset to form the heat dissipation of the circuit board, and the heat conduction effect is formed through the rear cover, forming an interaction of internal and external heat, thereby achieving a cooling effect.

[0021] 2. The utility model provides a DC centrifugal fan, in which the circuit board and the stator assembly are connected and fixed in such a way that the circuit board and the stator assembly form a modular structure, which is convenient for installation in the second chamber, thereby improving assembly efficiency.

[0022] 3. The utility model provides a DC centrifugal fan, in which the coil frame, the main body and the coil cooperate to achieve the effect of coil winding and fixing, making the coil fixing more reasonable, reducing the number of coil windings and reducing copper loss.

[0023] 4. The utility model provides a DC centrifugal fan, which realizes the connection and fixing effect of the circuit board through hook connection or bolt connection, thereby improving the firmness of the circuit board.

[0024] 5. The utility model provides a DC centrifugal fan, in which the positioning groove and the positioning protrusion cooperate to form a modular positioning assembly of the entire stator assembly and the circuit board, making the assembly more convenient.

[0025] 6. The utility model provides a DC centrifugal fan, in which the upper and lower coil frames cooperate with the coil to form the winding of the coil, firstly forming the fixation of the coil, and secondly forming a fixing effect between the two coil frames and the main body, forming a relatively fixed effect, and the coil adopts this structure, which is more reasonable and reduces the number of windings.

[0026] 7. The utility model provides a DC centrifugal fan, in which the lower support foot cooperates with the limiting protrusion to form a limiting effect to prevent deviation during assembly.

[0027] 8. The utility model provides a DC centrifugal fan with a plastic magnetic rotor. Compared with other rotor structures, this structure is light in weight, rotates more smoothly, improves rotation efficiency, and can also achieve environmental protection.

[0028] 9. The utility model provides a DC centrifugal fan, in which the bearing is arranged to improve the connection and fixing effect of the rotor, and prevent the rotor from rubbing against the rear cover and the outer shell, thereby affecting the rotation efficiency of the rotor.

[0029] 10. The utility model provides a DC centrifugal fan, the shape of the air duct is set so that the air in the air duct has a pressurized effect, thereby increasing the air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the structure of a DC centrifugal fan provided by the utility model;

[0032] Figure 2 A schematic diagram of the structure of a DC centrifugal fan provided by the utility model;

[0033] Figure 3A cross-sectional view of a DC centrifugal fan provided by the utility model;

[0034] Figure 4 A cross-sectional view of a DC centrifugal fan provided by the utility model;

[0035] Figure 5 A schematic diagram of the structure of the stator assembly and the circuit board provided by the utility model;

[0036] Figure 6 A schematic diagram of the structure of the stator assembly provided by the utility model;

[0037] Figure 7 A schematic diagram of the structure of the main body provided by the utility model;

[0038] Figure 8 A schematic diagram of the structure of the rear cover provided by the utility model;

[0039] Fig. 9 This is a schematic structural diagram of the shell provided by the utility model.

[0040] Description of reference numerals:

[0041] 11. base; 12. shell; 13. back cover; 14. first chamber; 15. centrifugal fan blade; 16. second chamber; 17. stator assembly; 18. circuit board; 19. rotor; 20. coil; 21. upper coil frame; 22. lower coil frame; 23. main body; 24. positioning groove; 25. positioning protrusion; 26. bearing; 131. heat dissipation column; 132. support column; 141. air inlet; 142. air outlet; 143. air duct; 161. threading hole; 162. limiting protrusion; 171. first channel; 181. heating element; 182. positioning hole; 211. upper support leg; 212. hook; 213. positioning column; 221. lower support leg; 231. fixing part; 232. horizontal area; 233. longitudinal area. DETAILED DESCRIPTION

[0042] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] Example 1

[0047] This embodiment provides a DC centrifugal fan, as shown in the attached Figure 1-9 As shown, including:

[0048] The fan body includes a base 11, a shell 12, and a back cover 13. The base 11 and the shell 12 cooperate to form a first chamber 14. The first chamber 14 is fixed with a centrifugal fan blade 15. The centrifugal fan blade 15 rotates in the first chamber 14 to form an airflow. Through the pressure difference, the external air enters the first chamber 14, and is accelerated and pressurized by the centrifugal fan blade 15 and finally discharged. Here, the first chamber 14 is also provided with an air inlet 141 and an air outlet 142. The air inlet 141 is located on the left side of the first chamber 14, that is, on the left side of the entire centrifugal fan, and the air outlet 142 is located on the front side of the first chamber 14, that is, on the front side of the entire centrifugal fan, forming a connection effect of the air path. The first chamber 14 is provided with an air duct 143, and the air duct 143 forms a connection between the air inlet 141 and the air outlet 142. Here, the shell 12 is located between the base 11 and the back cover 13. The housing 12 and the back cover 13 cooperate to form a second chamber 16. The second chamber 16 is a closed structure. The stator assembly 17, the circuit board 18, and the rotor 19 are all accommodated in the second chamber 16. The second chamber 16 is provided with a threading hole 161 connected to the outside. The external wire passes through the threading hole 161 and extends into the second chamber 16. The external wire forms an electrical connection with the circuit board 18. In this embodiment, the second chamber 16 is a closed structure, and dust and liquid are not easy to directly enter the second chamber 16. Further, in order to improve the protection level of the second chamber 16, a sealing structure, such as a sealing strip, etc., can be added between the back cover 13 and the housing 12.

[0049] The stator assembly 17 is accommodated in the second chamber 16; the stator assembly 17 is provided with a first channel 171, where the first channel 171 is located at the center of the stator assembly 17 and is through, and the central axis of the first channel 171 is coaxially arranged with the central axis of the second chamber 16, that is, the two ends of the first channel 171 are oriented left and right. The stator assembly 17 includes a plurality of coils 20, and the coils 20 are distributed in a circular array. The number of coils 20 here can be adjusted according to actual needs. In this embodiment, the number of coils 20 is six, and two adjacent coils 20 are independently arranged. There is a gap between two adjacent coils 20, and the size of the gap here can be adjusted according to actual needs. The coil 20 is specifically matched with the circuit board 18, and the power supply of the coil 20 is formed through external power supply and the circuit integration of the circuit board 18, thereby generating a magnetic effect and driving the rotor 19 to rotate.

[0050] Circuit board 18, circuit board 18 is accommodated in the second chamber 16, and circuit board 18 is fixed in the second chamber 16. Here, circuit board 18 can be fixed with the back cover 13, circuit board 18 can also be fixed with the housing 12, and circuit board 18 can also be fixed with the stator assembly 17. Circuit board 18 is electrically connected to coil 20. How to achieve electrical connection between circuit board 18 and coil 20 is a prior art, so it is not drawn in the attached drawings. Circuit board 18 is provided with a number of heating elements 181. Here, heating element 181 specifically refers to several components with high power and high heat generation, such as MOS tubes, IGBT switches, etc. The surface of heating element 181 is coated with thermal grease. Thermal grease is only applied in one layer on heating element 181, and its thickness is very small, not exceeding 1mm. Thermal grease is applied one-to-one to avoid waste.

[0051] The rotor 19 is accommodated in the second chamber 16. One end of the rotor 19 passes through the first channel 171 and extends to the first chamber 14 to be linked with the centrifugal fan blade 15. It should be noted that only a hole for the rotor 19 to pass through is provided between the first chamber 14 and the second chamber 16, and the other positions are not connected. The rotor 19 and the first channel 171 are coaxially arranged, which is equivalent to the rotor 19 being located at the center of the first channel 171. The other end of the rotor 19 extends toward the rear cover 13, where the rotor 19 can abut against the rear cover 13, or a certain distance can be formed between the rotor 19 and the rear cover 13. In this embodiment, it is preferred that the rotor 19 does not abut against the rear cover 13, so that the rotor 19 rotates more smoothly, but the rotor 19 is infinitely close to the rear cover 13, so that the heat generated by the rotor 19 can form a conduction effect through the rear cover 13.

[0052] The back cover 13 is made of a heat-conducting material, and is provided with heat-dissipating columns 131. The number of heat-dissipating columns 131 and the number of heating elements 181 are the same, forming a one-to-one correspondence effect. When the back cover 13 is matched with the housing 12, the heat-dissipating columns 131 extend to abut against the heating elements 181, forming a heat-conducting and heat-dissipating effect. Here, the back cover 13 can be made of aluminum alloy, or other heat-dissipating and heat-conducting materials.

[0053] With this structure, firstly, a closed second chamber 16 is formed by the cooperation between the back cover 13 and the outer shell 12, thereby improving the overall protection level and preventing dust and liquid from entering the second chamber 16. Secondly, the back cover 13 is made of heat-conducting material, and the rotor 19 extends toward the back cover 13 to form a certain heat-conducting effect. The heat dissipation column 131 and the heating element 181 are against each other to form the heat dissipation of the circuit board 18, and the heat conduction effect is formed through the back cover 13, forming an interaction of internal and external heat, thereby achieving a cooling effect.

[0054] Specifically, as attached Figure 3 , 5As shown, the circuit board 18 is connected and fixed to the stator assembly 17. The circuit board 18 and the stator assembly 17 are connected and fixed in such a way that the circuit board 18 and the stator assembly 17 form a modular structure, which is convenient for installation in the second chamber 16, thereby improving assembly efficiency. In addition, the circuit board 18 can also be connected and fixed to the back cover 13, and the circuit board 18 can also be connected and fixed to the housing 12.

[0055] Specifically, as attached Figure 5-7 As shown, the stator assembly 17 includes a main body 23 and a coil frame, the coil frame is connected to the main body 23, and the coil 20 is wound around the coil frame and the main body 23. In this embodiment, the main body 23 cooperates with the coil frame, and the six coils 20 are distributed in a circular array and are wound separately. Here, the coil 20 is wound up and down along the main body 23. The coordination between the coil frame, the main body 23, and the coil 20 forms an effect of achieving the winding and fixing of the coil 20, making the fixing of the coil 20 more reasonable, reducing the number of windings of the coil 20, and reducing copper loss. In this embodiment, the main body 23 is specifically made of silicon steel.

[0056] Specifically, as attached Figure 5-7As shown, the main body 23 is provided with a plurality of fixing parts 231, and the number of the fixing parts 231 is six here, and the six fixing parts 231 are distributed in a circumferential array, and all extend radially toward the center of the main body 23. The fixing part 231 is a T-shaped structure here. In this embodiment, the fixing part 231 is a transverse T-shaped. For better description, the fixing part 231 includes a transverse area 232 and a longitudinal area 233. The coil frame includes an upper coil frame 21 and a lower coil frame 22. The upper coil frame 21 is sleeved on the top of the fixing part 231, and specifically, the upper coil frame 21 is sleeved on the transverse area 232. The upper coil frame 21 is provided with upper legs, and the number of upper legs 211 is two, and both upper legs 211 extend upward. It should be noted here that the upper legs 211 located on the inner side also cooperate with the longitudinal area 233, and specifically, the upper legs 211 are provided with grooves, and the grooves are against the top surface of the longitudinal area 233. The lower coil frame 22 is sleeved below the fixed portion 231, specifically, the lower coil frame 22 is sleeved in the transverse region 232, and the upper and lower coil frames are matched to form a clamping effect on the fixed portion 231. The lower coil frame 22 is also provided with two lower legs 221, and the two lower legs 221 extend downward. The coil 20 is wound between the two upper legs 211 and the two lower legs 221, specifically, the coil 20 extends axially downward from between the two upper legs 211 to between the two lower legs 221, and then continues to extend axially upward to form a surrounding effect, and at this time the transverse region 232 is located in the coil 20. The upper and lower coil frames cooperate with the coil 20 to form the winding of the coil 20, first forming the fixation of the coil 20, and secondly forming the fixing effect between the two coil frames and the main body 23, forming a relatively fixed effect, and the coil 20 adopts this structure, which is more reasonable and reduces the number of windings.

[0057] Specifically, as attached Figure 5-7 As shown, the circuit board 18 and the coil frame are connected by hook or bolt. By means of hook connection or bolt connection, the connection and fixing effect of the circuit board 18 is achieved, and the firmness of the fixation of the circuit board 18 is improved. In this embodiment, the circuit board 18 is specifically matched with the upper coil frame 21 to form a connection and fixing effect. The upper coil frame 21 is provided with a hook 212, where the hook 212 is elastically arranged, and the hook 212 is distributed in a circular array, which can be two, three, or more. Bolt connection means that the bolt passes through the circuit board 18 and cooperates with the upper coil frame 21 to achieve the fixing effect.

[0058] Specifically, as attached Figure 5-7 As shown, the upper coil frame 21 is provided with a positioning column 213, and the circuit board 18 is provided with a positioning hole 182. The positioning column 213 passes through the positioning hole 182 to form a positioning and fixing effect of the circuit board 18. The number of the positioning columns 213 can be selected and adjusted according to actual needs.

[0059] Specifically, as attached Figure 5-9 As shown, one of the main body 23 and the second chamber 16 is provided with a positioning groove 24, and the other of the main body 23 and the second chamber 16 is provided with a positioning protrusion 25 that cooperates with the positioning groove 24. The cooperation between the positioning groove 24 and the positioning protrusion 25 forms a modular positioning assembly of the entire stator assembly 17 and the circuit board 18, making assembly more convenient. When the main body 23 is provided with a positioning groove 24, the second chamber 16 is provided with a positioning protrusion 25; conversely, when the main body 23 is provided with a positioning protrusion 25, the second chamber 16 is provided with a positioning groove 24. In this embodiment, the positioning groove 24 is provided on the outer surface of the main body 23, and the positioning protrusion 25 is provided on the inner wall of the second chamber 16.

[0060] Specifically, as attached Figure 5-9 As shown, the rear cover 13 is provided with a support column 132, which extends toward one side of the housing 12, and specifically extends toward the positioning protrusion 25. In this embodiment, the support column 132 abuts against the main body 23, and the abutting position is specifically located on the top surface of the positioning groove 24.

[0061] Specifically, as attached Figure 5-9 As shown, the second chamber 16 is provided with a plurality of limiting protrusions 162, and the lower support leg 221 is located between two adjacent limiting protrusions 162. The lower support leg 221 cooperates with the limiting protrusion 162 to form a limiting effect to prevent assembly deviation. The lower support leg 221 can only be located between two adjacent limiting protrusions 162. When the lower support leg 221 abuts against the limiting protrusion 162, the position of the entire stator assembly 17 is too high and cannot be installed and fixed.

[0062] Specifically, the rotor 19 is a plastic magnetic rotor 19. Compared with other rotor 19 structures, the plastic magnetic rotor 19 is light in weight, rotates more smoothly, improves the rotation efficiency, and can also play an environmental protection role.

[0063] Specifically, as attached Figure 3 As shown, at least two bearings 26 are also included. In this embodiment, only two bearings 26 are used as an example for description. One of the bearings 26 is connected to the rear cover 13, and the other bearing 26 is connected to the housing 12. Both ends of the rotor 19 pass through the corresponding bearings 26, that is, one end of the rotor 19 passes through the bearing 26 and extends toward the rear cover 13, and the other end of the rotor 19 passes through the bearing 26 and extends into the first chamber 14. The setting of the bearing 26 improves the connection and fixing effect of the rotor 19, prevents the rotor 19 from rubbing against the rear cover 13 and the housing 12, and affects the rotation efficiency of the rotor 19. In order to better achieve the fixing effect of the bearing 26, the rear cover 13 and the housing 12 are both provided with fixing grooves, and the bearing 26 is accommodated in the fixing grooves for fixing.

[0064] Specifically, as attached Figure 4As shown, the imaginary center line of the air duct 143 is an Archimedean spiral curve. The shape of the air duct 143 is set so that the air in the air duct 143 has a pressurized effect so that the air volume is increased.

[0065] Specifically, the external power supply of this embodiment is direct current, which is inverted to generate a three-phase waveform pulse voltage, and the output points U, V, and W are connected to the coil 20, thereby generating a rotating magnetic field, and the rotor 19 rotates to achieve the action effect.

[0066] Specifically, the threading hole 161 is located on the rear cover 13, or the threading hole 161 is located on the housing 12, or the portion of the rear cover 13 provided with the threading hole 161 and the portion of the housing 12 provided with the threading hole 161 are fitted together to form the threading hole 161. To further improve the protection level, the external wire and the threading hole 161 are also connected for protection.

[0067] Specifically, the housing 12 is connected to the rear cover 13 by bolts or snaps. The housing 12 is connected to the base by bolts or snaps.

[0068] Specifically, in addition to this, the centrifugal fan in this embodiment is powered by direct current, and it also has functions such as stepless speed and frequency conversion.

[0069] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A DC centrifugal fan, characterized in that: include: A fan body, the fan body comprising a base (11), a shell (12), and a rear cover (13); the base (11) and the shell (12) cooperate to form a first chamber (14); the shell (12) and the rear cover (13) cooperate to form a second chamber (16); a centrifugal fan blade (15) is fixed to the first chamber (14); the first chamber (14) is provided with an air duct (143); the second chamber (16) is a closed structure; and the second chamber (16) is provided with a threading hole (161) communicating with the outside; A stator assembly (17), the stator assembly (17) being accommodated in the second chamber (16); the stator assembly (17) being provided with a first channel (171), the stator assembly (17) comprising a plurality of coils (20), the coils (20) being distributed in a circumferential array; A circuit board (18), the circuit board (18) being accommodated in the second chamber (16), the circuit board (18) being electrically connected to the coil (20), the circuit board (18) being provided with a plurality of heating elements (181), and the surfaces of the heating elements (181) being coated with thermal conductive silicone grease; a rotor (19), the rotor (19) being accommodated in the second chamber (16), one end of the rotor (19) passing through the first channel (171) and extending to the first chamber (14) to be linked with the centrifugal fan blade (15), and the other end of the rotor (19) extending toward the rear cover (13); The rear cover (13) is made of a heat-conducting material. The rear cover (13) is provided with a heat dissipation column (131). The heat dissipation column (131) extends to abut against the heating element (181).

2. The DC centrifugal fan according to claim 1, characterized in that: The circuit board (18) is connected and fixed to the stator assembly (17).

3. The DC centrifugal fan according to claim 2, characterized in that: The stator assembly (17) comprises a main body (23) and a coil frame, wherein the coil frame is connected to the main body (23), and the coil (20) is wound around the coil frame and the main body (23).

4. The DC centrifugal fan according to claim 3, characterized in that: The coil frame and the circuit board (18) are connected by hook or bolt.

5. The DC centrifugal fan according to claim 3, characterized in that: One of the main body (23) and the second chamber (16) is provided with a positioning groove (24), and the other of the main body (23) and the second chamber (16) is provided with a positioning protrusion (25) matched with the positioning groove (24).

6. The DC centrifugal fan according to claim 3, characterized in that: The main body (23) is provided with a plurality of fixing parts (231), the fixing parts (231) are T-shaped, the coil frame comprises an upper coil frame (21) and a lower coil frame (22), the upper coil frame (21) is sleeved on the upper part of the fixing parts (231), the lower coil frame (22) is sleeved on the lower part of the fixing parts (231), and the coil (20) is wound around the upper coil frame (21), the fixing parts (231), and the lower coil frame (22).

7. The DC centrifugal fan according to claim 6, characterized in that: The lower coil frame (22) is provided with a lower support leg (221), and the second chamber (16) is provided with a plurality of limiting protrusions (162), wherein the lower support leg (221) is located between two adjacent limiting protrusions (162).

8. The DC centrifugal fan according to claim 1, characterized in that: The rotor (19) is a plastic magnetic rotor.

9. The DC centrifugal fan according to claim 1, characterized in that: It also includes at least two bearings (26), one of which is connected to the rear cover (13), one of which is connected to the housing (12), and two ends of the rotor (19) pass through the corresponding bearings (26).

10. The DC centrifugal fan according to claim 1, characterized in that: The imaginary center line of the air duct (143) is an Archimedean spiral curve.

Images