Fan and 3D printer

Abstract

The utility model provides a fan and a 3D printer, the fan comprises a hub, a driving part and a plurality of blades, and the driving part is in driving connection with the hub and used for driving the hub to rotate; the multiple blades are connected to the peripheral face of the hub at intervals in the circumferential direction of the hub. Each blade comprises a first end part, a middle section and a second end part, the first end part is connected to the periphery of the hub, the middle section is located between the first end part and the second end part and is connected with the first end part and the second end part, and the second end part is connected to the middle section of the next adjacent blade in the rotating direction of the hub; and an air duct is formed between the blade and the coated section of the next adjacent blade. Therefore, the second end part, far away from the hub, of each blade of the fan is in lap joint with the adjacent blade, compared with a structure that the second end part is arranged to be a free end, noise generated by vibration of the second end part can be avoided, and the mute effect of the fan is improved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a fan and a 3D printer. Background Art

[0002] When a 3D printer is working, the temperature near its nozzle is high, and a fan is needed to dissipate the heat from the nozzle to prevent the nozzle from aging after working at high temperature for a long time. Currently, the fan used in 3D printers is noisy, which affects the user experience. Utility Model Content

[0003] The present application provides a fan and a 3D printer to solve the problem of high fan noise used in 3D printers in the prior art.

[0004] In the first aspect, the present application provides a fan, comprising a hub, a driving member and a plurality of blades; the driving member is drivingly connected to the hub for driving the hub to rotate; the plurality of blades are connected to the outer circumference of the hub at intervals along the circumference of the hub; the blades comprise a first end, a middle section, and a second end: wherein the first end is connected to the outer circumference of the hub, the middle section is located between the first end and the second end, and connects the first end and the second end, and along the rotation direction of the hub, the second end is connected to the middle section of an adjacent blade, and forms an air duct between the blade and the section covered by an adjacent blade.

[0005] In a possible implementation manner, the end surface of the first end portion connected to the hub has a first contour line and a second contour line, and along the rotation direction of the hub, the first contour line is arranged in parallel to the front side of the second contour line and has a first end point and a second end point;

[0006] Along the axial direction of the hub, the first end point is located in front of the second end point, and along the rotation direction of the hub, the first end point is located in the rear of the second end point.

[0007] In a possible implementation manner, along the axial direction of the wheel hub, a projection of the first contour line on the front end surface of the wheel hub coincides with an outer circumference of the front end surface of the wheel hub;

[0008] Along the axial direction of the hub, a projection of the second contour line on the rear end surface of the hub coincides with an outer circumference of the rear end surface of the hub.

[0009] In a possible embodiment, along the axial direction of the hub, the projection of the first contour line on the front end surface of the hub has a first chord length, along the rotation direction of the hub, there is a second chord length between the front sides of two adjacent first end portions, and the ratio of the length of the first chord length to the length of the second chord length is 1 / 2 to 3 / 5.

[0010] In a possible implementation manner, the second end portion has a third contour line, the third contour line is located at an end surface where the second end portion is connected to the middle section, and has a third endpoint and a fourth endpoint;

[0011] Along the axial direction of the hub, the third endpoint is located in front of the fourth endpoint, and along the rotation direction of the hub, the third endpoint is located in the rear of the fourth endpoint.

[0012] In a possible implementation manner, a region of the blade covered by an adjacent blade has a third chord length, and the third chord length accounts for 1 / 5 to 1 / 4 of the total chord length of the end surface of the blade.

[0013] In a possible implementation, the extension direction of the blade is arranged at an angle with the axial direction of the hub, and the angle is 60° to 80°; the curvature of the blade first increases and then decreases along the rotation direction of the hub.

[0014] In a possible embodiment, the fan further includes a fan frame having a through slot, wherein an extension direction of the through slot is parallel to an axial direction of the hub, the hub and the plurality of blades are located in the through slot, and the blades are spaced apart from a peripheral wall of the through slot.

[0015] In a possible embodiment, the fan further includes a pre-rotation blade, which is connected to the through slot and is located at the rear side of the blade along the axial direction of the hub, and is used to guide the airflow to rotate and then flow to the blade.

[0016] In a second aspect, an embodiment of the present application further provides a 3D printer, comprising a printer body, a nozzle and the above-mentioned fan, wherein the nozzle is connected to the printer body, and the fan is connected to one side of the nozzle for dissipating heat from the nozzle.

[0017] In the fan of the present application, the first end of the blade is connected to the hub so that the blade rotates with the hub, and the middle section of the blade is bent so that the second end overlaps the middle section of another blade. Compared with most structures in which the second end is set as a free end, the second end can avoid generating noise due to vibration, thereby improving the silent effect of the fan and reducing the noise generated when the fan is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 1 is a three-dimensional schematic diagram of a fan according to an embodiment of the present application.

[0019] Figure 2 It is a schematic diagram of the front structure of the blades of the fan in one embodiment of the present application.

[0020] Figure 3 It is a schematic top plan view of the blades of the fan in one embodiment of the present application.

[0021] Figure 4 It is a front plan view of the blades of the fan in one embodiment of the present application.

[0022] Figure 5 Schematic diagram of the rear structure of the blades of the fan in one embodiment of the present application.

[0023] Figure 6 It is a schematic rear plan view of a blade of a fan in one embodiment of the present application.

[0024] Figure 7 FIG. 1 is a schematic diagram of an explosion of a fan in one embodiment of the present application.

[0025] Figure 8 FIG. 1 is a schematic diagram of the structure of a 3D printer according to an embodiment of the present invention.

[0026] Description of main component symbols:

[0027] Fan 100

[0028] Air outlet side 1

[0029] Air inlet side 2

[0030] Wheel 10

[0031] Front Face 101

[0032] Rear end face 102

[0033] Mounting slot 103

[0034] Driving member 20

[0035] Blade 30

[0036] Air duct 301

[0037] The first end portion 31

[0038] Middle section 32

[0039] The second end portion 33

[0040] Sash frame 40

[0041] Through slot 41

[0042] Pre-rotation blade 50

[0043] Center 51

[0044] Leaf 52

[0045] Guide slope 520

[0046] Rotation directionS

[0047] Axis Z

[0048] First contour line L1

[0049] Second contour line L2

[0050] The third contour line L3

[0051] First endpoint P1

[0052] The second endpoint P2

[0053] The third endpoint P3

[0054] Fourth endpoint P4

[0055] First chord length A1

[0056] Second chord length A2

[0057] The third chord length is A3

[0058] Angle R

[0059] 3D Printer 200

[0060] Printer main body 210

[0061] Nozzle 220

[0062] Heat sink 230

[0063] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0064] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0065] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include the plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the existence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0066] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0067] The specific implementation methods of the present application are further described in detail below with reference to the accompanying drawings.

[0068] like Figure 1 to Figure 2 As shown, an embodiment of the present application provides a fan 100 , including a hub 10 , a driving member 20 , and a plurality of blades 30 .

[0069] The driving member 20 is drivingly connected to the hub 10 to drive the hub 10 to rotate. A plurality of blades 30 are connected to the outer periphery of the hub 10 at intervals along the circumference of the hub 10 to rotate synchronously with the hub 10, so that the rotation of the blades 30 pushes the airflow around the blades 30 to move to form an airflow, and the airflow is blown out from one side of the blades 30.

[0070] The blade 30 includes a first end 31, a middle section 32, and a second end 33. The first end 31 is connected to the outer circumference of the hub 10. The middle section 32 is located between the first end 31 and the second end 33, one end of the middle section 32 is connected to the first end 31, and the other end is connected to the second end 33. The middle section 32 is integrally formed with the first end 31 and the second end 33, and the first end 31, the middle section 32, and the second end 33 have the same thickness, so as to avoid noise caused by a sudden change in the flow velocity of the airflow in a certain section of the blade 30.

[0071] Along the rotation direction S of the hub 10, the second end portion 33 is connected to the middle section 32 of the next adjacent blade 30, and an air duct 301 is formed between the blade 30 and the covered section of the next adjacent blade 30, and the air duct 301 is for air flow to pass through, so that the air flow pushed by the blade 30 is blown out from one end of the air duct 301. The blades 30 and the blades 30 and the hub 10 are all integrally formed to avoid adding additional connection structures to affect the flow direction of the air flow or even generate noise.

[0072] At the same time, the blades 30 overlap each other around the outer circumference of the hub 10 and are arranged to form an annular structure. The inner circumference of the annular structure is connected to the outer circumference of the hub 10, which can improve the stability of the connection of each blade 30 and reduce the amplitude of each blade 30 during rotation, thereby reducing noise.

[0073] Thus, in the fan 100 of the present application, the first end 31 of the blade 30 is connected to the hub 10 so that the blade 30 rotates with the hub 10, and the middle section 32 of the blade 30 is bent so that the second end 33 overlaps the middle section 32 of another blade 30. Compared with most structures in which the second end 33 is set as a free end, the second end 33 can be prevented from generating noise due to vibration, thereby improving the silent effect of the fan 100 and reducing the noise generated when the fan 100 is working.

[0074] Please combine again Figures 1 to 4 In one embodiment, the first end portion 31 is substantially a rectangular structure, and the end surface of the first end portion 31 connected to the hub 10 has a first contour line L1 and a second contour line L2. Along the rotation direction S of the hub 10, the first contour line L1 is arranged parallel to the front side of the second contour line L2 and has a first endpoint P1 and a second endpoint P2.

[0075] Along the axial direction Z of the hub 10, the first endpoint P1 is located in front of the second endpoint P2. It is worth noting that along the axial direction Z of the hub 10, the side of the hub 10 close to the driving member 20 is the rear side, that is, the air inlet side 2 of the fan 100, and the side of the hub 10 away from the driving member 20 is the front side, that is, the air outlet side 1 of the fan 100. In this way, the first endpoint P1 is located on the air outlet side 1 of the first end portion 31, and the second endpoint P2 is located on the air inlet side 2 of the first end portion 31.

[0076] Along the rotation direction S of the hub 10 , the first endpoint P1 is located behind the second endpoint P2 so that the first contour line L1 is inclined to the axial direction Z of the hub 10 , so that the blade 30 can have a lateral thrust on the airflow in the rotation direction S of the hub 10 when rotating.

[0077] In this way, when the airflow flows into the air duct 301, the airflow is guided into the area covered by the adjacent blades 30 of the blades 30 located on the front side along the rotation direction S of the hub 10, and the airflow is guided out by the blades 30 located on the rear side along the rotation direction S of the hub 10.

[0078] It can be understood that the first contour line L1 can be a straight line or a curve, and along the rotation direction S of the hub 10, the first contour line L1 bends from its first end point P1 toward its second end point P2, so that when the blade 30 guides the airflow, the airflow can flow smoothly through the blade 30 to avoid turbulence and the like.

[0079] Please combine again Figures 4 to 6 In one embodiment, along the axial direction Z of the hub 10, the projection of the second contour line L2 on the rear end surface 102 of the hub 10 coincides with the outer periphery of the rear end surface 102 of the hub 10, so that when the blades 30 located at the front side along the rotation direction S of the hub 10 guide the airflow into the air duct 301, the airflow enters the air duct 301 in a direction roughly tangent to the rotation direction S of the hub 10, and the airflow entering the air duct 301 is more smoothly subjected to the lateral thrust of the blades 30, thereby avoiding the occurrence of loud noise when the airflow flows in the air duct 301.

[0080] Along the axial direction Z of the hub 10, the projection of the first contour line L1 on the front end surface 101 of the hub 10 coincides with the outer periphery of the front end surface 101 of the hub 10, so that when the blades 30 located on the rear side along the rotation direction S of the hub 10 guide the airflow entering the air duct 301 to flow out, its guiding direction is roughly the same as the guiding direction of the blades 30 located on the front side along the rotation direction S of the hub 10 when guiding the airflow into the air duct 301, thereby avoiding turbulence of the airflow in the air duct 301.

[0081] Please combine again Figures 2 to 4 In one embodiment, along the axial direction Z of the hub 10, the projection of the first contour line L1 on the front end face 101 of the hub 10 has a first chord length A1. At the same time, as mentioned above, the second contour line L2 is parallel to the first contour line L1, and the projection of the second contour line L2 on the rear end face 102 of the hub 10 coincides with the outer periphery of the rear end face 102 of the hub 10, then the chord length of the projection of the second contour line L2 on the rear end face 102 of the hub 10 is the same as the first chord length A1.

[0082] Along the rotation direction S of the hub 10, there is a second chord length A2 between the front sides of two adjacent first end portions 31, and the ratio of the length of the first chord length A1 to the length of the second chord length A2 is 1 / 2 to 3 / 5, so that the width of the blade 30 located on the front side along the rotation direction S of the hub 10 in the rotation direction S of the hub 10 is substantially the same as the width of the blade 30 located on the rear side along the rotation direction S of the hub 10 in the rotation direction S of the hub 10, and the sum of the widths of the two is substantially the same as the width of the two adjacent blades 30 in the rotation direction S of the hub 10, so that the caliber of the opening on the air inlet side 2 of the air duct 301 is substantially the same as the caliber of the opening on the air outlet side 1.

[0083] It is understandable that the ratio of the length of the first chord length A1 to the length of the second chord length A2 may also be other ratios, and the specific values ​​thereof may be adaptively adjusted according to actual design requirements.

[0084] Please combine again Figure 2 and Figure 3In one embodiment, the second end portion 33 is a substantially rectangular structure. The second end portion 33 has a third contour line L3, the third contour line L3 is located at the long side of the end surface of the second end portion 33 connected to the middle section 32, and has a third endpoint P3 and a fourth endpoint P4.

[0085] The third endpoint P3 is located in front of the fourth endpoint P4 along the axial direction Z of the hub 10. That is, the third endpoint P3 is located at the outlet side 1 of the second end 33, and the fourth endpoint P4 is located at the inlet side 2 of the second end 33. Along the rotation direction S of the hub 10, the third endpoint P3 is located behind the fourth endpoint P4, so that the third contour line L3 is inclined with respect to the axial direction Z of the hub 10, so that the blade 30 can have a lateral thrust on the airflow in the rotation direction S of the hub 10 when rotating.

[0086] It can be understood that the third contour line L3 can be a straight line or a curve, and along the rotation direction S of the hub 10, the third contour line L3 bends from its third endpoint P3 toward its fourth endpoint P4, so that when the blade 30 guides the airflow, the airflow can flow smoothly through the blade 30 to avoid turbulence and the like.

[0087] Please combine again Figure 4 In one embodiment, the area of ​​the blade 30 covered by the adjacent blade 30 has a third chord length A3. The front side surface or the rear side surface of the blade 30 along the axial direction Z of the hub 10 is a curved surface, and the third chord length A3 accounts for 1 / 5 to 1 / 4 of the total chord length of the end surface of the blade 30, so that each blade 30 fills a larger area in the circle formed by the overlap of each blade 30, thereby increasing the air flow of the fan 100 within a limited volume.

[0088] It is understandable that the ratio of the third chord length A3 to the total chord length of the end surface of the blade 30 may also be other ratios, and its specific value may be adaptively adjusted according to actual design requirements.

[0089] Please combine again Figure 3 , and see Figure 1 In one embodiment, the blade 30 is generally fan-shaped and partially twisted from outside to inside. The extension direction of the blade 30 is set at an angle R with the axial direction Z of the hub 10, and the angle R is 60° to 80°, which can increase the width of the blade 30 in the rotation direction S of the hub 10, increase the effective area of ​​the blade 30 on the airflow entering the air duct 301, thereby increasing the thrust on the airflow to increase the wind speed of the fan 100.

[0090] It is understandable that the angle R may also be other values, and its specific value may be adaptively adjusted according to actual design requirements.

[0091] Please combine again Figure 3 and Figure 6 In one embodiment, along the rotation direction S of the hub 10, the curvature of the blade 30 increases first and then decreases, so that the two end areas where the blade 30 guides the airflow into and out of the air duct 301 are smoother, avoiding turbulence of the airflow, which causes loud noise when the airflow flows into or out of the air duct 301. At the same time, the curvature of the middle area of ​​the blade 30 is relatively large, so that part of the airflow flowing away from the hub 10 can be quickly guided to flow out along the air duct 301 after changing the flow direction.

[0092] Please combine again Figure 7 , and see Figure 1 and Figure 5 In one embodiment, the fan 100 further includes a fan frame 40, which is provided with a through slot 41. The cross section of the through slot 41 is circular to match the shape of the structure formed by overlapping each blade 30. The extending direction of the through slot 41 is parallel to the axial direction Z of the hub 10. The hub 10 and the plurality of blades 30 are located in the through slot 41, and the blades 30 are spaced apart from the peripheral wall of the through slot 41 so that the inner peripheral wall of the through slot 41 does not interfere with the rotation of the blades 30.

[0093] Furthermore, the fan 100 also includes a pre-rotation blade 50 , which is connected to the through slot 41 and is located at the rear side of the blade 30 along the axial direction Z of the hub 10 , and is used to guide the airflow to rotate and then flow to the blade 30 .

[0094] The pre-rotation blade 50 includes a central portion 51 and a plurality of blade portions 52, and the plurality of blade portions 52 are evenly spaced around the periphery of the central portion 51. One end of the blade portion 52 is connected to the central portion 51, and the other end thereof is connected to the inner peripheral wall of the through slot 41. The blade portion 52, the central portion 51, and the fan frame 40 can be integrally formed to reduce the installation process.

[0095] Along the rotation direction S of the hub 10, the end of the blade 52 close to the hub 10 is located in front of the end away from the hub 10, and the blade 52 is bent and extended from the end close to the hub 10 to the end away from the hub 10. Along the axial direction Z of the hub 10, the front side of the blade 52 is provided with a guide slope 520, and the guide slope 520 is inclined inwardly and forwardly from the rear side along the rotation direction S of the hub 10 to the front side along the rotation direction S of the hub 10, so as to guide the rotation direction of the airflow entering the pre-rotation blade 50 to be consistent with the rotation direction of the airflow guided by the subsequent blade 30, thereby increasing the air volume and reducing noise.

[0096] Furthermore, a mounting groove 103 is provided at the rear side of the hub 10, and the driving member 20 is located in the mounting groove 103, which can reduce the thickness of the entire fan 100. The driving member 20 is a power element such as a motor, one end of which is transmission-connected to the bottom wall of the mounting groove 103, and the other end of which is installed in the center portion 51.

[0097] like Figure 8 As shown, the embodiment of the present application further provides a 3D printer 200, comprising a printer body 210, a nozzle 220 and the above-mentioned fan 100. The nozzle 220 is connected to the printer body 210 and can slide relative to the printer body 210.

[0098] The fan 100 is connected to one side of the nozzle 220 for dissipating heat from the nozzle 220. Specifically, the outer side of the nozzle 220 is connected with stacked heat dissipation fins 230, and the heat dissipation fins 230 are thermally connected to the nozzle 220 to achieve heat transfer between the heat dissipation fins 230 and the nozzle 220. The fan 100 is mounted on the heat dissipation fins 230 and blows air toward the heat dissipation fins 230 to dissipate heat from the heat dissipation fins 230, thereby achieving heat dissipation of the nozzle 220.

[0099] Thus, the 3D printer 200 has the fan 100 and the stacked structure of the blades 30 of the fan 100 , which can reduce the noise generated when the fan 100 is working and improve the user experience of the 3D printer 200 .

[0100] In the above, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A fan, characterized in that: include: Wheel hub; A driving member, drivingly connected to the wheel hub, and used to drive the wheel hub to rotate; A plurality of blades, wherein the plurality of blades are connected to the outer periphery of the hub at intervals along the circumferential direction of the hub; the blades include a first end, a middle section, and a second end; Among them, the first end is connected to the outer circumferential surface of the hub, the middle section is located between the first end and the second end, and connects the first end and the second end, along the rotation direction of the hub, the second end is connected to the middle section of the adjacent next blade, and forms an air duct between the blade and the covered section of the adjacent next blade.

2. The fan according to claim 1, characterized in that The end surface of the first end portion connected to the hub has a first contour line and a second contour line. Along the rotation direction of the hub, the first contour line is arranged in parallel to the front side of the second contour line and has a first end point and a second end point. Along the axial direction of the hub, the first end point is located in front of the second end point, and along the rotation direction of the hub, the first end point is located in the rear of the second end point.

3. The fan according to claim 2, characterized in that Along the axial direction of the wheel hub, a projection of the first contour line on the front end surface of the wheel hub coincides with the outer periphery of the front end surface of the wheel hub; Along the axial direction of the hub, a projection of the second contour line on the rear end surface of the hub coincides with an outer circumference of the rear end surface of the hub.

4. The fan according to claim 3, characterized in that Along the axial direction of the hub, the projection of the first contour line on the front end surface of the hub has a first chord length, and along the rotation direction of the hub, a second chord length is provided between the front sides of two adjacent first end portions, and the ratio of the length of the first chord length to the length of the second chord length is 1 / 2 to 3 / 5.

5. The fan according to claim 1, characterized in that The second end portion has a third contour line, the third contour line is located at the end surface where the second end portion is connected to the middle section, and has a third endpoint and a fourth endpoint; Along the axial direction of the hub, the third endpoint is located in front of the fourth endpoint, and along the rotation direction of the hub, the third endpoint is located in the rear of the fourth endpoint.

6. The fan according to claim 1, characterized in that The area of ​​the blade covered by an adjacent blade has a third chord length, and the third chord length accounts for 1 / 5 to 1 / 4 of the total chord length of the end surface of the blade.

7. The fan according to claim 1, characterized in that The extension direction of the blade is arranged at an angle with the axial direction of the hub, and the angle is 60° to 80°; the curvature of the blade first increases and then decreases along the rotation direction of the hub.

8. The fan according to claim 1, wherein: The fan further comprises a fan frame, the fan frame is provided with a through slot, the extension direction of the through slot is parallel to the axial direction of the hub, the hub and the plurality of blades are located in the through slot, and the blades are spaced apart from the inner peripheral wall of the through slot.

9. The fan according to claim 8, characterized in that The fan further comprises a pre-rotation blade, which is connected to the through slot and is arranged along the axial direction of the hub. The pre-rotation blade is located at the rear side of the blade and is used for guiding the airflow to rotate and then flow to the blade.

10. A 3D printer, characterized in that: The invention comprises a printer body, a nozzle and a fan as claimed in any one of claims 1 to 9, wherein the nozzle is connected to the printer body, and the fan is connected to one side of the nozzle for dissipating heat from the nozzle.

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