Cooling fan outer frame and double-ball-bearing cooling fan

Abstract

The utility model discloses a cooling fan outer frame and a double ball bearing cooling fan, the outer frame comprises a base, a central tube and an isolating ring, the central tube is located in the center of the base, and the central tube is provided with an axial tube hole; the isolating ring and the central pipe are two parts which are coaxially arranged but are mutually independent, the isolating ring is sleeved and positioned in the axial pipe hole so as to isolate the axial pipe hole into a first hole section and a second hole section, the first hole section is used for mounting a first bearing, and the second hole section is used for mounting a second bearing. According to the utility model, the first hole section and the second hole section can be kept concentric and coaxial, the first bearing and the second bearing are respectively assembled in the first hole section and the second hole section, and after the shaft rod on the fan blade is pivoted to the first bearing and the second bearing, the shaft rod and the bearings can be highly concentric and coaxial. When the cooling fan is used, the shaft rod is uniformly loaded, the rotation is smooth, the work is reliable and stable, and the service life is long.

Description

Technical Field

[0001] The utility model relates to a cooling fan, in particular to an outer frame of a cooling fan and a double ball bearing cooling fan. Background Art

[0002] The ball bearing cooling fan is a common electronic heat dissipation solution and is widely used in various electronic products. It uses electromagnetic force to drive the blades to rotate at high speed, quickly taking away the heat from the heat source to achieve effective heat dissipation and temperature reduction. With its compact structural design and excellent heat dissipation performance, the ball bearing cooling fan has become an indispensable and important part of the electronic heat dissipation field.

[0003] Generally, the structure of the ball bearing cooling fan includes three main components: an outer frame, a rotor device, and a stator device. The center of the outer frame has a central tube. The stator assembly is sleeved and fixed outside the central tube to provide electromagnetic driving force. The rotor assembly usually includes a fan blade and a shaft rod provided on the fan blade. The fan blade rotates under the action of electromagnetic force to achieve heat dissipation and air supply.

[0004] In this structure, two bearings are installed at intervals inside the central tube, and the shaft rod is pivotally connected between these two bearings. The role of the bearings is to provide support and rotation guidance for the shaft rod, enabling it to rotate precisely at high speed. Therefore, the concentricity and coaxiality of the two bearings directly affect the operating reliability of the entire rotor device.

[0005] However, the manufacturing process of the central tube determines that it is difficult for the two internal segment holes to be completely concentric. Referring to Figure 8 As shown, specifically, the inside of the central tube 10' consists of a front segment hole K1 and a rear hole segment K2, and there is a fixed plastic ring platform 101' in the middle to separate the front hole segment K1 and the rear hole segment K2. The plastic ring platform 101' is integrally injection-molded with the central tube 10'. This integrally formed structure requires the mold to be pulled out from both the front and rear ends (mold release in the A direction and mold release in the B direction) when demolding, that is, it needs to be processed with different front and rear mold cores. Coupled with the influence of multiple factors such as the injection molding machine and the rubber material, the front and rear hole segments cannot achieve 100% concentricity. Another solution is to first use a CNC lathe to machine a precision copper or aluminum inner tube, and then implant the inner tube into the mold for injection molding. However, this method has a relatively high processing cost and a relatively long production cycle.

[0006] Therefore, for the central tube formed by plastic injection molding process, after installing bearings in the two hole segments respectively, it is also difficult for the two bearings to achieve an ideal concentric and coaxial state. When the shaft rod of the rotor rotates at high speed, it will be subjected to uneven load, and after long-term use, a series of fault problems such as bearing wear, rust, noise, and even detachment will occur. Summary of the Invention

[0007] The present utility model aims to solve at least one of the technical problems in the related art to some extent. To this end, the object of the present utility model is to provide a heat dissipation fan outer frame and a double ball bearing heat dissipation fan.

[0008] To achieve the above object, on the one hand, according to an embodiment of the present utility model, a heat dissipation fan outer frame includes:

[0009] A base;

[0010] A central tube, the central tube is located at the center of the base, the central tube has an axial tube hole, the upper end of the axial tube hole is open, and the lower end of the axial tube hole penetrates through the base;

[0011] An isolation ring, the isolation ring and the central tube are two coaxially arranged but independent components, and the isolation ring is sleeved and positioned in the axial tube hole to isolate the axial tube hole into a first hole section and a second hole section. Among them, the first hole section is used to install a first bearing, and the second hole section is used to install a second bearing.

[0012] In addition, the heat dissipation fan outer frame according to the above embodiment of the present utility model may further have the following additional technical features:

[0013] According to an embodiment of the present utility model, a positioning groove is provided on the peripheral wall of the central tube, and the positioning groove extends along the axial direction of the central tube;

[0014] A positioning portion is provided on the outer peripheral surface of the isolation ring, and the positioning portion is in positioning cooperation with the positioning groove to limit the isolation ring at a predetermined height position in the axial tube hole.

[0015] According to an embodiment of the present utility model, the lower end of the positioning groove has a resisting surface, and the upper end of the positioning groove penetrates through the upper end of the central tube to form an opening;

[0016] The positioning portion is inserted into the positioning groove from the opening and slides down along the positioning groove to abut against the resisting surface.

[0017] According to an embodiment of the present utility model, the positioning portion extends along the axial direction of the central tube and has the same height as the positioning groove.

[0018] According to an embodiment of the present utility model, there are at least two positioning grooves, at least two positioning grooves are arranged at intervals along the circumferential direction of the central tube, there are at least two positioning portions, at least two positioning portions correspond to at least two positioning grooves one by one, and each positioning portion is in positioning cooperation with the corresponding positioning groove.

[0019] According to an embodiment of the present utility model, the outer diameter of the isolation ring is adapted to the inner diameter of the axial tube hole, and the inner side surface of the positioning portion does not protrude from the inner wall of the axial tube hole.

[0020] According to an embodiment of the present utility model, the outer side surface of the positioning portion does not protrude from the outer peripheral wall of the central tube.

[0021] According to an embodiment of the present utility model, a stepped surface is formed at the lower end of the positioning portion for assembling and limiting the stator assembly.

[0022] According to an embodiment of the present utility model, the axial tube hole is formed by single-mode core one-way demolding.

[0023] On the other hand, the double-ball bearing cooling fan provided by the present utility model includes:

[0024] The cooling fan outer frame as described above;

[0025] A first bearing and a second bearing, the first shaft is installed in the first hole section, and the second bearing is installed in the second hole section;

[0026] A rotor device, the rotor device includes a fan blade and a shaft rod, the fan blade is provided on the shaft rod, and the shaft rod is pivotally connected to the first bearing and the second bearing.

[0027] For the cooling fan outer frame and the double-ball bearing cooling fan provided by the embodiments of the present utility model, the isolation ring is used as an independent component, and the isolation ring can be processed separately, while the central tube is used as an independent component. At this time, the axial tube hole in the central tube is a continuous through hole. Therefore, when the central tube is injection molded, single-mode core one-side demolding can be used to complete it. During application, the isolation ring is then sleeved and positioned in the axial tube hole, and the axial tube hole is separated into a first hole section and a second hole section by using the isolation ring. The first hole section and the second hole section are formed by single-mode core one-side demolding of the axial tube hole. Therefore, the first hole section and the second hole section can maintain concentricity and coaxiality. After the first bearing and the second bearing are respectively assembled in the first hole section and the second hole section, and the shaft rod on the fan blade is pivotally connected to the first bearing and the second bearing, the shaft rod and the bearing can achieve high concentricity and coaxiality. During the use of this cooling fan, the shaft rod is evenly loaded, rotates smoothly, works reliably and stably, and has a long service life.

[0028] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 is a schematic structural diagram of the outer frame of the cooling fan in the embodiment of the present invention;

[0031] Figure 2 is a top view of the outer frame of the cooling fan in the embodiment of the present invention;

[0032] Figure 3 is an exploded view of the outer frame of the cooling fan in the embodiment of the present invention;

[0033] Figure 4 is Figure 2 a partial enlarged view at A-A in

[0034] Figure 5 is Figure 2 a partial enlarged view at B-B in

[0035] Figure 6 is a schematic structural diagram of the double ball bearing cooling fan in the embodiment of the present invention;

[0036] Figure 7 is a cross-sectional view of the double ball bearing cooling fan in the embodiment of the present invention;

[0037] Figure 8 is a schematic structural diagram of the outer frame of the cooling fan in the prior art.

[0038] Reference numerals:

[0039] 10. Base;

[0040] 11. Central tube;

[0041] H11. Positioning groove;

[0042] S11. Abutting surface;

[0043] H111. Opening;

[0044] H12. Axial tube hole;

[0045] H121. First hole section;

[0046] H122. Second hole section;

[0047] 20. Isolation ring;

[0048] 201. Positioning part;

[0049] S20. Step surface;

[0050] 30. Rotor device;

[0051] 301. Fan blade;

[0052] 302. Shaft rod;

[0053] 40. First bearing;

[0054] 41. Second bearing.

[0055] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0056] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0057] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0059] In the present utility model, unless otherwise clearly specified or limited, the terms "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0060] In the present utility model, unless otherwise clearly specified or limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0061] The following will describe in detail the outer frame of the cooling fan and the double ball bearing cooling fan according to the embodiments of the present utility model with reference to the drawings.

[0062] Refer to Figures 1 to 5 As shown, the outer frame of the cooling fan according to the embodiment of the present utility model includes a base 10, a central tube 11 and a spacer ring 20.

[0063] Specifically, the base 10 can be configured as a hollow bracket-like structure to facilitate the flow of air. An accommodation space can be formed inside the base 10 to facilitate the accommodation and installation of the stator assembly.

[0064] The central tube 11 is located at the center of the base 10, and the central tube 11 has an axial tube hole H12. The upper end of the axial tube hole H12 is open, and the lower end of the axial tube hole H12 penetrates through the base 10. Preferably, the central tube 11 and the base 10 are generally an integrally formed structure. For example, the middle edge of the base 10 has a platform portion, and the central tube 11 protrudes upward from the platform portion, and the two are integrally injection molded.

[0065] The spacer ring 20 and the central tube 11 are two coaxially arranged but independent components, and the spacer ring 20 is sleeved and positioned in the axial tube hole H12 to isolate the axial tube hole H12 into a first hole section H121 and a second hole section H122. Among them, the first hole section H121 is used for installing the first bearing 40, and the second hole section H122 is used for installing the second bearing 41.

[0066] It is worth mentioning that the isolation ring 20 and the central tube 11 are designed as two coaxial but independent components. That is, different from the prior art, in the present application, the isolation ring 20 is an independent component and can be independently injection-molded. After the isolation ring 20 is made independent, the central tube 11 can be molded by single-core single-side demolding only because the axial tube hole H12 is a continuous through-hole. In other words, the axial tube hole H12 is formed by single-core single-side demolding.

[0067] After the isolation ring 20 and the central tube 11 are separately and independently processed, they can be assembled together. During assembly, the isolation ring 20 will be sleeved and positioned within the axial tube hole H12 of the central tube 11. At this time, the axial tube hole H12 is isolated and divided into a first hole section H121 and a second hole section H122 by using the isolation ring 20. Among them, a first bearing 40 can be installed in the first hole section H121, and a second bearing 41 can be installed in the second hole section H122.

[0068] It should be noted that when the traditional integral central tube 11 is injection-molded, due to the process of double-core double-side demolding before and after, two hole sections are respectively formed in the front and back, it is very difficult to ensure that the two hole sections in the front and back are completely concentric and coaxial. In the present utility model, after the central tube 11 and the isolation ring 20 are independent of each other, the central tube 11 can be molded by single-core single-side demolding only. This improvement in the process structure enables the first hole section H121 and the second hole section H122 to obtain ideal concentricity and coaxiality.

[0069] According to the heat dissipation fan outer frame and the double-ball bearing heat dissipation fan provided by the embodiment of the present utility model, taking the isolation ring 20 as an independent component, the isolation ring 20 can be processed separately, and the central tube 11 is an independent component. At this time, the axial tube hole H12 in the central tube 11 is a continuous through-hole. Therefore, when the central tube 11 is injection-molded, it can be completed by single-core single-side demolding. During application, the isolation ring 20 is then sleeved and positioned into the axial tube hole H12, and the axial tube hole H12 is separated into a first hole section H121 and a second hole section H122 by using the isolation ring 20. And the first hole section H121 and the second hole section H122 are formed by single-core single-side demolding of the axial tube hole H12. Therefore, the first hole section H121 and the second hole section H122 can maintain concentricity and coaxiality. After the first bearing 40 and the second bearing 41 are respectively assembled in the first hole section H121 and the second hole section H122, and the shaft rod 302 on the fan blade 301 is pivotally connected to the first bearing 40 and the second bearing 41, the shaft rod 302 and the bearings can achieve high concentricity and coaxiality. During the use of this heat dissipation fan, the shaft rod 302 is uniformly stressed under the load, rotates smoothly, works reliably and stably, and has a long service life.

[0070] Refer to Figures 3 to 5As shown, in an embodiment of the present utility model, a positioning groove H11 is formed on the peripheral wall of the central tube 11, and the positioning groove H11 extends along the axial direction of the central tube 11.

[0071] A positioning portion 201 is provided on the outer peripheral surface of the isolation ring 20, and the positioning portion 201 is in positioning cooperation with the positioning groove H11 to limit the isolation ring 20 at a predetermined height position within the axial tube hole H12.

[0072] During the assembly process, when the isolation ring 20 is sleeved into the axial tube hole H12, the positioning portion 201 can be accurately engaged into the positioning groove H11. This cooperative design of the positioning groove H11 and the positioning portion 201 can firmly limit the isolation ring 20 at a predetermined height position within the axial tube hole H12, preventing the isolation ring 20 from shifting axially, thereby ensuring that the axial dimensions of the first hole section H121 and the second hole section H122 are determined, and preparing the position for the subsequent installation of the first bearing 40 and the second bearing 41. From the perspective of structural technology, the positioning groove H11 is directly machined in the mold cavity during the injection molding of the central tube 11, while the positioning portion 201 on the isolation ring 20 can be completed by synchronous injection molding during the processing of the isolation ring 20. In addition, with the positioning cooperation structure of the positioning groove H11 and the positioning portion 201, the two are precisely matched, and the installation and disassembly are more convenient.

[0073] Refer to Figure 3 As shown, in an embodiment of the present utility model, the lower end of the positioning groove H11 has a resisting surface S11, and the upper end of the positioning groove H11 penetrates through the upper end of the central tube 11 to form an opening H111.

[0074] The positioning portion 201 is inserted into the positioning groove H11 from the opening H111 and slides downward along the positioning groove H11 to abut against the resisting surface S11.

[0075] In this structure, the resisting surface S11 will limit the termination position of the downward sliding of the positioning portion 201. And the upper end of the positioning groove H11 penetrates through the upper end of the central tube 11 to form an opening H111. When installing the isolation ring 20, the operator only needs to insert the positioning portion 201 on the isolation ring 20 from the opening H111 first, and then slide downward along the positioning groove H11, and finally will firmly abut against the resisting surface S11 to achieve precise positioning.

[0076] This "top-down" insertion installation method is more simple and convenient to operate. At the same time, the abutting contact between the positioning portion 201 and the resisting surface S11 can firmly fix the position of the isolation ring 20, preventing axial displacement and ensuring reliable and stable assembly of the isolation ring 20 and the central tube 11.

[0077] Preferably, the positioning portion 201 extends along the axial direction of the central tube 11 and has the same height as the positioning groove H11. In this way, when the positioning portion 201 is inserted into the positioning groove H11, it can fill the entire space of the positioning groove H11. After the positioning portion 201 is combined with the central tube 11, the central tube 11 is equivalent to having a complete circumference. This design can, on the one hand, greatly improve the positioning accuracy between the positioning portion 201 and the positioning groove H11; on the other hand, the complete circumferential structure also makes the central tube 11 have high structural strength, which is beneficial to the assembly with the stator assembly and the bearing.

[0078] Referring Figures 1 to 3 As shown, in some embodiments of the present invention, there are at least two positioning grooves H11, and the at least two positioning grooves H11 are arranged at intervals along the circumferential direction of the central tube 11. The positioning portion 201 is at least two, and the at least two positioning portions 201 correspond to the at least two positioning grooves H11 one by one, and each positioning portion 201 is in positioning cooperation with the corresponding positioning groove H11.

[0079] In this embodiment, at least two positioning grooves H11 are in positioning cooperation with at least two positioning portions 201 one by one. This design concept of multi-point circumferential positioning can effectively avoid the possible eccentricity or inclination caused by positioning only at a single position, so that the isolation ring 20 can be firmly locked and maintained in an ideal state of concentricity and coaxiality. In addition, the overall structure is more stable and reliable.

[0080] Referring Figures 3 to 5 As shown, in an embodiment of the present invention, the outer diameter of the isolation ring 20 is adapted to the inner diameter of the axial tube hole H12, and the inner side surface of the positioning portion 201 does not protrude from the inner wall of the axial tube hole H12.

[0081] The outer diameter dimension of the isolation ring 20 is adapted to the inner diameter of the axial tube hole H12 of the central tube 11, and the two can be precisely fitted. This precise matching design, on the one hand, ensures that the isolation ring 20 can be smoothly inserted into the axial tube hole H12 and prevents the isolation ring 20 from shaking or shifting in the tube hole, which is beneficial to maintaining a concentric and coaxial assembly state.

[0082] In addition, in the design of the positioning portion 201, in order not to affect the assembly of the first bearing 40 and the second bearing 41, it is required that the inner side surface of the positioning portion 201 does not protrude from the inner wall of the axial tube hole H12. In this way, the circumferential surfaces of the inner walls of the first hole section H121 and the second hole section H122 in the axial tube hole H12 are smooth without any protrusions, which is convenient for the assembly with the first bearing 40 and the second bearing 41. This design not only avoids the interference and blockage of the positioning portion 201 to the bearing, but also is beneficial for the bearing to obtain better concentric and coaxial accuracy.

[0083] Preferably, there is a dimensional difference of 0.05 to 0.2 mm between the inner side surface of the positioning portion 201 and the inner wall of the axial tube hole H12. This dimensional difference can still ensure that the assembly of the first bearing 40 and the second bearing 41 is not affected even when the central tube 11 and the isolation ring 20 shrink or deform. That is to say, the dimensional difference provides dimensional redundancy to cope with the shrinkage or deformation of the central tube 11 and the isolation ring 20.

[0084] Preferably, the outer side surface of the positioning portion 201 does not protrude beyond the outer peripheral wall of the central tube 11. Since the outside of the central tube 11 needs to be sleeved and fitted with the stator assembly, the fact that the outer side surface of the positioning portion 201 does not protrude beyond the outer peripheral wall of the central tube 11 can ensure that the positioning portion 201 will not interfere with or hinder the assembly between the stator assembly and the central tube 11, thus improving the reliability of the assembly between the central tube 11 and the stator assembly.

[0085] Refer to Figure 3 As shown, in an embodiment of the present invention, a stepped surface S20 is formed at the lower end of the positioning portion 201 for providing assembly limit for the stator assembly. This stepped surface S20 can provide a precise limit reference surface for the subsequent assembly of the stator assembly. When assembling the stator assembly, only need to sleeved the positioning assembly outside the central tube 11 and make the positioning assembly descend until it abuts against the stepped surface S20. At this time, the positioning assembly is installed in place, ensuring that the stator assembly is assembled to the specified ideal position and guaranteeing the precise assembly between components.

[0086] Refer to Figures 6 to 7 As shown, according to the double ball bearing cooling fan provided by the present invention, it includes the cooling fan outer frame as described in the above embodiment. In addition, the cooling fan further includes a first bearing 40, a second bearing 41, and a rotor device 30. The first shaft is installed in the first hole section H121, and the second bearing 41 is installed in the second hole section H122.

[0087] The rotor device 30 includes a fan blade 301 and a shaft rod 302. The fan blade 301 is provided on the shaft rod 302, and the shaft rod 302 is pivotally connected between the first bearing 40 and the second bearing 41.

[0088] It can be understood that the cooling fan further includes a stator assembly (not shown), and the stator assembly includes an iron core and windings, etc. The stator assembly is sleeved and fixed on the central tube 11. The rotor device 30 further includes a magnetic member. After the stator assembly is energized, a magnetic field is generated. The magnetic field and the magnetic member in the rotor device 30 form a magnetic force action, thereby driving the rotor assembly to rotate.

[0089] According to the double-ball bearing cooling fan provided by the embodiments of the present utility model, it has the above-mentioned cooling fan outer frame, and the isolation ring 20 is used as an independent component. The isolation ring 20 can be processed separately, and the central tube 11 is used as an independent component. At this time, the axial tube hole H12 in the central tube 11 is a continuous through hole. Therefore, when the central tube 11 is injection-molded, it can be completed by using a single mold core for single-side demolding. During application, the isolation ring 20 is sleeved and positioned in the axial tube hole H12, and the axial tube hole H12 is separated into a first hole section H121 and a second hole section H122 by the isolation ring 20. The first hole section H121 and the second hole section H122 are formed by single-side demolding of the axial tube hole H12 with a single mold core. Therefore, the first hole section H121 and the second hole section H122 can maintain concentricity and coaxiality. After the first bearing 40 and the second bearing 41 are respectively assembled in the first hole section H121 and the second hole section H122, and the shaft rod 302 on the fan blade 301 is pivotally connected to the first bearing 40 and the second bearing 41, the shaft rod 302 and the bearings can achieve high concentricity and coaxiality. During the use of this cooling fan, the shaft rod 302 is evenly stressed under load, rotates smoothly, works reliably and stably, and has a long service life.

[0090] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0091] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. All equivalent structural transformations made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present utility model.

Claims

1. A cooling fan frame, characterized in that: include: Base; A central tube, the central tube being located at the center of the base, the central tube having an axial tube hole, the upper end of the axial tube hole being open, and the lower end of the axial tube hole passing through the base; An isolating ring, wherein the isolating ring and the center tube are two coaxially arranged but independent components, and the isolating ring is sleeved and positioned in the axial tube hole to isolate the axial tube hole into a first hole section and a second hole section, wherein the first hole section is used to install a first bearing, and the second hole section is used to install a second bearing.

2. The cooling fan frame according to claim 1, characterized in that: The peripheral wall of the central tube is provided with a positioning groove, and the positioning groove extends along the axial direction of the central tube; A positioning portion is provided on the outer peripheral surface of the isolation ring, and the positioning portion is positioned and matched with the positioning groove to limit the isolation ring to a predetermined height position in the axial pipe hole.

3. The cooling fan frame according to claim 2, characterized in that: The lower end of the positioning groove has a supporting surface, and the upper end of the positioning groove penetrates to the upper end of the central tube to form an opening; The positioning portion is inserted into the positioning groove from the opening, and then slides downward along the positioning groove to abut against the abutting surface.

4. The heat dissipation fan frame according to claim 2, characterized in that: The positioning portion extends along the axial direction of the central tube and has the same height as the positioning groove.

5. The heat dissipation fan frame according to claim 2, characterized in that: There are at least two positioning grooves, which are spaced apart along the circumference of the central tube; there are at least two positioning portions, which correspond one-to-one to at least two positioning grooves, and each positioning portion is positioned and matched with the corresponding positioning groove.

6. The heat dissipation fan frame according to claim 2, characterized in that: The outer diameter of the isolation ring is matched with the inner diameter of the axial tube hole, and the inner side surface of the positioning portion does not protrude from the inner wall of the axial tube hole.

7. The heat dissipation fan frame according to claim 2, characterized in that: The outer side surface of the positioning portion does not protrude from the outer peripheral wall of the central tube.

8. The heat dissipation fan frame according to claim 2, characterized in that: A step surface is formed at the lower end of the positioning portion for assembling and limiting the stator assembly.

9. The heat dissipation fan frame according to claim 1, characterized in that: The axial tube hole is formed by unidirectional demoulding of a single-mode core.

10. A double ball bearing cooling fan, characterized in that: include: The cooling fan frame according to any one of claims 1 to 9; a first bearing and a second bearing, the first shaft being mounted in the first bore section, and the second bearing being mounted in the second bore section; The rotor device comprises a fan blade and a shaft rod, wherein the fan blade is arranged on the shaft rod, and the shaft rod is pivotally connected in the first bearing and the second bearing.

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