A hollow shaft type cooling fan

Abstract

The utility model discloses a hollow shaft type radiating fan, include: fan outer frame, support axle, its fixed on the base of fan outer frame and along the height direction of fan outer frame extension, stator mechanism, its fixed on fan outer frame and located support axle periphery, rotor mechanism, its rotation support is in support axle, including rotation setting in support axle and located stator mechanism inner periphery hollow shaft, fixed on the outer wall of hollow shaft and located stator mechanism inner periphery permanent magnet, fixed in the impeller of hollow shaft axial first end, fixed in the sealing end cover of hollow shaft axial second end and fixed in the fan assembly of hollow shaft and cover set in stator mechanism periphery, hollow shaft first end is close to the base, and the impeller has the interval between the base. The utility model provides a hollow shaft type radiating fan can improve the radiating performance, realizes the full sealing of bearing.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of axial flow fan, especially relates to a hollow shaft type heat dissipation fan. BACKGROUND

[0002] The axial flow fan is a kind of air-cooled heat dissipation fan commonly used in industrial applications, which is widely used in automobile engine cooling, industrial ventilation and heat dissipation, air conditioning cooling and other fields due to its simple structure, light weight, low price and good heat dissipation effect.

[0003] As disclosed in Chinese patent CN213990340U, the assembled heat dissipation fan, wherein the shaft core is rotatably supported in the column sleeve through the bearing assembly, the rotor assembly is fixedly connected with the shaft core, the rotor assembly is driven to rotate by the stator assembly, and in the use process of the fan, there is the problem of insufficient heat dissipation, and dust, water vapor, salt mist and the like are easy to enter the bearing, affecting the normal work of the bearing. UTILITY MODEL CONTENT

[0004] To solve the above problems, the utility model aims at providing a hollow shaft type heat dissipation fan, which is convenient for heat dissipation and prevents sundries from entering the bearing.

[0005] Based on the above problems, the technical scheme provided by the utility model is:

[0006] A hollow shaft type heat dissipation fan, comprising:

[0007] A fan outer frame;

[0008] A support shaft fixed on the base of the fan outer frame and extending along the height direction of the fan outer frame;

[0009] A stator mechanism fixed on the fan outer frame and located at the outer periphery of the support shaft;

[0010] A rotor mechanism rotatably supported on the support shaft, comprising a hollow shaft rotatably arranged on the support shaft and located at the inner periphery of the stator mechanism, a permanent magnet fixed on the outer wall of the hollow shaft and located at the inner periphery of the stator mechanism, an impeller fixed on the first end of the hollow shaft, a sealing end cover fixed on the second end of the hollow shaft, and a fan assembly fixed on the hollow shaft and covering the outer periphery of the stator mechanism, wherein the first end of the hollow shaft is close to the base, and the impeller has a spacing with the base.

[0011] In some embodiments, the impeller comprises a support disc, a support seat arranged on one side of the thickness direction of the support disc, and a plurality of blades arranged on the other side of the thickness direction of the support disc, the support seat is fixedly connected with the inner wall of the hollow shaft, the support disc abuts against the first end of the hollow shaft, and the support disc and the support seat are provided with a avoiding hole for the support shaft to pass through.

[0012] In some embodiments, the plurality of blades are evenly spaced along the circumference of the support disc and arranged in a spiral.

[0013] In some embodiments, the outer circumference of the support seat is provided with a plurality of hooks, and the inner wall of the hollow shaft is provided with a plurality of clamping grooves matched with the plurality of hooks.

[0014] In some embodiments, the hooks are tapered towards the support seat from the blades.

[0015] In some embodiments, the hollow shaft is rotatably arranged on the support shaft through a plurality of bearings, the support shaft is tightly fitted with the inner ring of the bearing, and the hollow shaft is tightly fitted with the outer ring of the bearing.

[0016] In some embodiments, the number of bearings is two, and the hollow shaft is provided with two limiting steps matched with the two bearings.

[0017] In some embodiments, the sealing end cover comprises a bottom cover part and a boss part arranged on the bottom cover, a first positioning step is formed between the boss part and the bottom cover part, and a second positioning step matched with the first positioning step is arranged on the inner wall of the hollow shaft.

[0018] In some embodiments, the hollow shaft is a stainless steel part.

[0019] In some embodiments, the impeller is a plastic part.

[0020] Compared with the prior art, the advantages of the utility model are:

[0021] (1) The rotor mechanism comprises a hollow shaft for rotating and supporting the fan assembly, an impeller is arranged at the first end of the hollow shaft, and a sealing end cover is arranged at the second end of the hollow shaft, when the fan assembly rotates, the impeller rotates, the generated air volume can heat the motor and electronic parts, and the heat dissipation performance of the fan is improved.

[0022] (2) When the fan works, a pressure difference is formed between the impeller and the outer frame of the fan, wind continuously diffuses outward in the gap, protection is formed, external dust, water vapor, salt mist and the like cannot enter the bearing, the normal work of the bearing is ensured, and the fan can be used in complex environments containing dust, water vapor, salt mist and the like. BRIEF DESCRIPTION OF DRAWINGS

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the hollow shaft cooling fan of this utility model;

[0025] Figure 2 for Figure 1 Enlarged view of a section at point I;

[0026] Figure 3 This is one of the structural schematic diagrams of the impeller in the embodiments of this utility model;

[0027] Figure 4 This is the second schematic diagram of the impeller structure in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the sealing end cap in an embodiment of this utility model;

[0029] in:

[0030] 1. Fan frame; 1-1. Base;

[0031] 2. Support shaft;

[0032] 3. Hollow shaft; 3-1. Slot; 3-2. Limiting step; 3-3. Second positioning step;

[0033] 4. Permanent magnet;

[0034] 5. Fan assembly;

[0035] 6. Stator mechanism;

[0036] 7. Impeller; 7-1. Support plate; 7-2. Blade; 7-3. Support base; 7-4. Hook; 7-5. Clearance hole;

[0037] 8. Bearings;

[0038] 9. Sealing end cap; 9-1. Bottom cover; 9-2. Boss; 9-3. First positioning step. Detailed Implementation

[0039] The above solution will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrating the present invention and are not intended to limit the scope of the present invention. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0040] As Figure 1 shown, a hollow shaft type cooling fan, comprising a fan outer frame 1, a support shaft 2, a stator mechanism 6 and a rotor mechanism.

[0041] The fan outer frame 1 is in a cubic structure, and is provided with a cylindrical mounting groove, and is provided with a base 1-1 at one end in the height direction of the fan outer frame 1, and the stator mechanism 6 and the rotor mechanism are accommodated in the mounting groove.

[0042] The support shaft 2 is fixedly installed on the base 1-1 of the fan outer frame 1 and extends along the height direction of the fan outer frame 1.

[0043] The stator mechanism 6 is fixed on the base 1-1 and located outside the support shaft 2, comprising a stator core and a stator winding and other components, which is prior art, and the utility model will not be described.

[0044] The rotor mechanism is rotatably supported on the support shaft 2, comprising a hollow shaft 3 rotatably arranged on the support shaft 2 and located in the inner periphery of the stator mechanism 6, a permanent magnet 4 fixed on the hollow shaft 3 and located in the inner periphery of the stator mechanism 6, a impeller 7 fixed on the first end of the hollow shaft 3, a sealing end cover 9 fixed on the second end of the hollow shaft 3, and a fan assembly 5 fixed on the hollow shaft 3 and covering the outer periphery of the stator mechanism 6, the first end of the hollow shaft 3 is close to the base 1-1, and the impeller 7 has a spacing with the base 1-1. Wherein, the permanent magnet 4 is in interference fit with the hollow shaft 3, and is fixed by point gluing. Preferably, the hollow shaft 3 is a stainless steel part, and the impeller 7 is a plastic part.

[0045] As Figure 3 and Figure 4 shown, the impeller 7 comprises a support disc 7-1, a support seat 7-3 arranged on one side of the thickness direction of the support disc 7-1, and a plurality of blades 7-2 arranged on the other side of the thickness direction of the support disc 7-1, the support seat 7-3 is fixedly connected with the inner wall of the hollow shaft 3, and the support disc 7-1 abuts against the first end of the hollow shaft 3, and the support disc 7-1 and the support seat 7-3 are provided with an avoiding hole 7-4 for the support shaft 2 to pass through.

[0046] Among them, a plurality of blades 7-2 are uniformly and evenly arranged along the circumferential direction of the support disc 7-1 and arranged in a spiral shape.

[0047] The support seat 7-3 is in a hollow cylindrical structure, and the support seat 7-3 is in interference fit with the inner wall of the hollow shaft 3. In order to improve the stability of the structure, as Figure 2As shown, a plurality of clamping hooks 7-4 are arranged on the outer periphery of the support seat 7-3, and a plurality of clamping grooves 3-1 matched with the plurality of clamping hooks 7-4 are arranged on the inner wall of the hollow shaft 3. Through the cooperation of the clamping hooks 7-4 and the clamping grooves 3-1, the stability of the fixing structure between the impeller 7 and the hollow shaft 3 is improved. Specifically, the clamping hooks 7-4 are tapered from the blade 7-2 to the support seat 7-3, facilitating the installation of the support seat 7-3 in the hollow shaft 3 and the clamping of the support seat 7-3 with the clamping grooves 3-1.

[0048] The hollow shaft 3 is rotatably arranged on the support shaft 2 through a plurality of bearings 8. The support shaft 2 is tightly matched with the inner ring of the bearing 8, and the hollow shaft 3 is tightly matched with the outer ring of the bearing 8. In this example, the number of bearings 8 is two, and the two bearings 8 are arranged at the upper part and the lower part of the hollow shaft 3, respectively. Two limiting steps 3-2 matched with the two bearings 8 are arranged in the hollow shaft 3. The outer ring of the bearing 8 at the lower part abuts against the corresponding limiting step 3-2 at one axial end and abuts against the support seat 7-3 at the other axial end, so that the bearing 8 at the lower part is prevented from loosening and falling off during use, and the stability of the structure is improved. The outer ring of the bearing 8 at the upper part abuts against the corresponding limiting step 3-2.

[0049] As shown, Figure 5 The sealing end cover 9 includes a bottom cover part 9-1 and a boss part 9-2 arranged on the bottom cover part 9-1. A first limiting step 9-3 is formed between the boss part 9-2 and the bottom cover part 9-1. A second limiting step 3-3 matched with the first limiting step 9-1 is arranged on the inner wall of the hollow shaft 3. Through the cooperation of the first limiting step 9-3 and the second limiting step 3-3, the sealing end cover 9 is stably fixed on the hollow shaft 3.

[0050] When the fan works, the hollow shaft 3 rotates to drive the fan assembly 5 and the impeller 7 to rotate. The air volume generated by the impeller 7 can heat the motor and electronic parts, and a pressure difference is formed between the base 1-1 and the fan, so that dust, water vapor, salt mist and the like are prevented from entering the bearing.

[0051] In summary, the heat dissipation fan can improve the heat dissipation performance and prevent dust, water vapor, salt mist and the like from entering the bearing.

[0052] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable the personnel familiar with this technology to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A hollow shaft type cooling fan characterized by, The application relates to a fan assembly, comprising: a fan outer frame; a support shaft fixed on a base of the fan outer frame and extending along the height direction of the fan outer frame; a stator mechanism fixed on the fan outer frame and located at the outer periphery of the support shaft; a rotor mechanism rotationally supported on the support shaft, comprising a hollow shaft rotationally arranged on the support shaft and located at the inner periphery of the stator mechanism, a permanent magnet fixed on the outer wall of the hollow shaft and located at the inner periphery of the stator mechanism, an impeller fixed on the axial first end of the hollow shaft, a sealing end cover fixed on the axial second end of the hollow shaft, and a fan assembly fixed on the hollow shaft and covering the outer periphery of the stator mechanism, wherein the axial first end of the hollow shaft is close to the base, and the impeller is spaced apart from the base. The impeller comprises a support disc, a support seat arranged on one side of the thickness direction of the support disc, and a plurality of blades arranged on the other side of the thickness direction of the support disc, the support seat is fixedly connected with the inner wall of the hollow shaft, the support disc abuts against the axial first end of the hollow shaft, and the support disc and the support seat are provided with avoiding holes for the support shaft to pass through. The plurality of blades are uniformly and circumferentially spaced apart and arranged in a spiral shape. The outer periphery of the support seat is provided with a plurality of clamping hooks, and the inner wall of the hollow shaft is provided with a plurality of clamping grooves matched with the plurality of clamping hooks. The clamping hooks are tapered towards the support seat from the blades.

2. The hollow shaft type heat-dissipating fan according to claim 1, wherein: The hollow shaft is rotationally arranged on the support shaft through a plurality of bearings, the support shaft is tightly matched with the inner ring of the bearings, and the hollow shaft is tightly matched with the outer ring of the bearings.

3. The hollow shaft type heat-dissipating fan according to claim 2, wherein: The number of the bearings is two, and the hollow shaft is internally provided with two limiting steps matched with the two bearings.

4. The hollow shaft type radiating fan according to claim 3, characterized by: The sealing end cover comprises a bottom cover part and a boss part arranged on the bottom cover, a first positioning step is formed between the boss part and the bottom cover part, and the inner wall of the hollow shaft is provided with a second positioning step matched with the first positioning step.

5. The hollow shaft type heat-dissipating fan according to claim 4, wherein: The hollow shaft is a stainless steel part.

6. The hollow shaft radiator fan of claim 1 wherein: The impeller is a plastic part.

7. The hollow shaft radiator fan of claim 6 wherein: ​ 8. The hollow shaft radiator fan of claim 1 wherein: ​ 9. The hollow shaft radiator fan of claim 1 wherein: ​ 10. The hollow shaft radiator fan of claim 1 wherein: ​

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