A volute structure and a fan

Abstract

The application provides a volute structure and a fan, relates to the technical field of the fan, and solves the technical problems of short air duct size and short air supply distance. The volute structure comprises a base provided with a first cavity and an upper cover provided with a second cavity; the base and the upper cover are assembled together so that the first cavity and the second cavity form an air duct for air flow circulation; the end of the volute structure extends outward on one side to form an air outlet duct; the air outlet duct is communicated with the air duct to allow air flow to flow out; the projection length of the air outlet duct in the horizontal direction is equal to 1 / 3 of the diameter of the volute structure. The width of the air duct inside the air outlet duct is equal to 1 / 3 of the diameter of the volute structure; the fan comprises the volute structure and an impeller rotor; the impeller rotor comprises a guide fan blade, a shaft core, an oil-containing bearing and a friction-reducing and noise-reducing piece. The application improves the air supply distance of the fan, increases the air volume by improving the air duct structure, and reduces the friction noise by arranging the friction-reducing and noise-reducing piece.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, and in particular to a volute structure and a brushless DC volute wind turbine. Background Technology

[0002] Due to their low cost, DC fans are becoming increasingly common in home appliances. As user demands increase, the requirements for airflow and noise levels in fan technology development are also rising.

[0003] The applicant has discovered that the prior art has at least the following technical problems:

[0004] For large-sized brushless DC fans: 1. Due to the weight of the impeller, the plastic retaining spring on the shaft is not strong enough during the drop test, causing the impeller rotor to fall off and the drop test to fail; 2. During the rotation of the impeller rotor, the rubber ring on the fan shaft rubs against the end face of the oil-impregnated bearing, generating abnormal noise. At the same time, the impeller rotor will have axial transmission during operation, causing the molded impeller blades to collide with the oil-impregnated bearing, generating abnormal noise; 3. The air outlet duct of conventional brushless DC fans is relatively short, resulting in a short air delivery distance. Summary of the Invention

[0005] The purpose of this invention is to provide a volute structure and a brushless DC volute fan with the volute structure, so as to solve the technical problems of short duct size and short air delivery distance in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a volute structure, the volute structure comprising a base having a first concave cavity and a top cover having a second concave cavity; the base and the top cover are assembled together such that the first concave cavity and the second concave cavity form an air duct for airflow; one end of the volute structure extends outward to form an air outlet duct, the air outlet duct being connected to the air duct to allow airflow to flow out; the projected length of the air outlet duct in the horizontal direction is equal to 1 / 3 of the diameter of the volute structure.

[0008] The volute structure provided by this invention improves the air duct structure and extends the fan air duct, thereby lengthening the fan and increasing the fan's air delivery distance.

[0009] Furthermore, the air outlet duct has a funnel-shaped structure, with the outer width of the duct being greater than the inner width.

[0010] By optimizing the shape of the air outlet in the air duct, the air pressure is increased, and the air delivery distance is longer.

[0011] Furthermore, the inner width of the air outlet duct is equal to 1 / 3 of the diameter of the volute structure.

[0012] By optimizing the specifications of the air duct outlet, the air pressure is increased, the air delivery distance is increased, and the air volume is increased.

[0013] Furthermore, the air outlet duct is inclined, and a volute tongue with an upward angle is formed between one side of the air outlet duct and the volute structure.

[0014] By setting the volute tongue with an upward angle, wind resistance is reduced and airflow is increased.

[0015] Furthermore, the included angle of elevation at the volute tongue is 40°.

[0016] By designing the angle of the volute tongue section of the air duct to 40° (90°-50°), the fan's airflow is almost entirely blown out from the connection point on the opposite side of the volute tongue, concentrating the airflow, increasing the airflow pressure, and increasing the air delivery distance and airflow.

[0017] Furthermore, the included angle of elevation on the other side of the air outlet duct is 70°.

[0018] By setting the other side of the air outlet duct to a sloping structure with an elevation angle of 70°, the air outlet duct becomes a sloping horn-shaped structure, reducing wind resistance, overcoming the wind resistance of the entire unit's air duct, and increasing air volume.

[0019] Furthermore, the volute structure has a volute connecting part at the connection point with the other side of the air outlet duct. The volute connecting part is a sloping structure with an included elevation angle of 70°.

[0020] By designing the connection between the air duct of the volute and the air outlet duct at an upward angle of 70°, the extended air outlet duct and the volute are on the same plane, which maximizes the overcoming of the wind resistance of the whole unit's air duct, increases the air volume, and increases the air delivery distance.

[0021] Furthermore, one of the base and the top cover is provided with a buckle, and the other of the base and the top cover is provided with a hook, and the two are connected by the buckle and the hook.

[0022] The snap-fit ​​connection allows for quick assembly and disassembly of the base and top cover.

[0023] Secondly, the present invention provides a fan comprising:

[0024] The volute structure; and,

[0025] The impeller rotor is installed in the volute structure.

[0026] The fan provided by this invention optimizes the air duct structure, extends the specifications of the outlet air duct, and narrows the inner end of the outlet air duct, which can improve the fan's air pressure and increase the air delivery distance. By setting the volute tongue part at an elevation angle of 40°, the fan's air volume is almost entirely blown out from the connecting part, concentrating the air delivery and more effectively increasing the air delivery distance and air volume. By setting the volute air duct at an elevation angle of 70°, the same as the elevation angle of the connecting part, so that the extended outlet air duct and the volute structure are on the same plane, overcoming the wind resistance of the entire air duct to the maximum extent, increasing the air volume and increasing the air delivery distance.

[0027] Furthermore, a central tube is formed within the base for mounting the impeller rotor, and the impeller rotor is mounted into the central tube via a shaft core.

[0028] The impeller rotor is installed into the base by using the central tube, which facilitates the installation and fixation of the impeller rotor.

[0029] Furthermore, the impeller rotor includes guide fan blades, a shaft core, an oil-impregnated bearing, and friction-reducing and noise-reducing components, wherein:

[0030] One end of the shaft is connected to the support seat of the guide fan blade, and the other end is suspended outside the end contour line of the guide fan blade.

[0031] The oil-impregnated bearing is sleeved on the shaft core;

[0032] The friction-reducing and noise-reducing components are respectively installed at both ends of the oil-impregnated bearing.

[0033] By installing friction-reducing and noise-reducing components at both ends of the oil-impregnated bearing, not only is the friction noise of the fan and the impact sound when the fan moves axially reduced, but wear is also reduced.

[0034] Furthermore, the friction-reducing and noise-reducing component includes a gasket and a first rubber ring disposed between the oil-impregnated bearing and the support seat; the gasket is attached to the support seat.

[0035] By first setting a wear-resistant shim at one end of the shaft core, that is, the end near the fan blade, to prevent the first rubber ring from rubbing against the injection molded support seat of the guide fan blade and causing wear, and then setting a soft first rubber ring, the function of which is to prevent the wear-resistant shim from rubbing against the end face of the oil-impregnated bearing and generating noise, and at the same time, it can also solve the impact noise generated by the impact between the wear-resistant shim and the end face of the oil-impregnated bearing when the impeller rotor moves erratically.

[0036] Furthermore, the friction-reducing and noise-reducing component includes a second rubber ring, a metal retaining ring, and a plastic retaining ring disposed between the oil-impregnated bearing and the central tube of the base. The second rubber ring is attached to the end of the oil-impregnated bearing. The metal retaining ring and the plastic retaining ring are both secured in the retaining groove of the shaft core.

[0037] By first setting a second rubber ring at the other end of the shaft core, the soft second rubber ring prevents the retaining ring from rubbing against the end face of the oil-impregnated bearing and generating noise. Then, a metal retaining ring is set. The function of the metal retaining ring is to prevent the impeller rotor from falling off during the fan drop and to enhance the impeller rotor's drop resistance. After adding the metal retaining ring, a plastic retaining ring is added. The function of the plastic retaining ring is to tightly fit the metal retaining ring. Because the metal retaining ring is made of metal and cannot be compressed, when the metal retaining ring is placed in the retaining groove of the shaft core, the metal retaining ring is in a loose state. During the operation of the impeller rotor, the metal retaining ring will generate relative movement with the shaft core and generate noise. By setting a plastic retaining ring to tightly fit the metal retaining ring, the generation of noise is avoided.

[0038] Furthermore, the sum of the thicknesses of the metal retaining ring and the plastic retaining ring is greater than the height of the retaining groove.

[0039] This structural design allows the plastic retaining ring to tightly press against the metal retaining ring, preventing relative movement and noise.

[0040] Furthermore, the fan is a brushless DC volute fan. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of the fan of the present invention;

[0043] Figure 2 This is a schematic diagram of the exploded structure of the wind turbine of this invention;

[0044] Figure 3 This is a schematic diagram of the base structure of the fan of the present invention;

[0045] Figure 4 This is a schematic diagram of the impeller rotor of the fan of the present invention;

[0046] Figure 5 This is an elevation view of the air outlet duct in the fan of the present invention.

[0047] In the diagram: 1. Base; 2. Top cover; 3. Air duct; 4. Air outlet duct; 41. Outer side of air duct; 42. Inner side of air duct; 5. Air inlet; 6. Volute tongue; 7. Volute housing connection; 8. Buckle; 9. Hook; 10. Middle tube; 11. Shaft core; 12. Guide fan blade; 13. Oil-impregnated bearing; 14. Gasket; 15. First rubber ring; 16. Second rubber ring; 17. Metal circlip; 18. Plastic circlip; 19. Support base; 20. Slot; 21. Stator assembly; 22. Magnetic pole changing device. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0049] The present invention provides a volute structure, which includes a base 1 having a first concave cavity and a top cover 2 having a second concave cavity; the base 1 and the top cover 2 are assembled together such that the first concave cavity and the second concave cavity form an air duct 3 for airflow; one end of the volute structure extends outward to form an air outlet duct 4, which is connected to the air duct 3 to allow airflow to flow out; the projected length of the air outlet duct 4 in the horizontal direction is equal to 1 / 3 of the diameter of the volute structure.

[0050] The horizontal direction referred to here means, for example, Figure 5 From the perspective of the air outlet duct 4, the length when projected onto the horizontal plane.

[0051] Furthermore, the impeller rotor is installed inside the air duct within the volute structure, and the upper cover 2 has an air inlet 5 corresponding to the position of the impeller rotor to facilitate airflow entry.

[0052] The volute structure provided by this invention improves the air duct structure and extends the fan air duct, thereby lengthening the fan and increasing the fan's air delivery distance.

[0053] To further increase air volume and improve air gathering effect, the air outlet duct 4 has a funnel-shaped structure. The width of the outer side 41 of the duct is greater than the width of the inner side 42 of the duct. It should be noted that the outer side 41 of the duct refers to the end away from the volute structure, and the inner side 42 of the duct refers to the end closer to the volute structure.

[0054] By optimizing the shape of the air outlet in the air duct, the air pressure is increased, and the air delivery distance is longer.

[0055] Furthermore, the width of the inner side 42 of the air outlet duct 4 is equal to 1 / 3 of the diameter of the volute structure.

[0056] By optimizing the specifications of the air outlet in the air duct (wind speed = air volume / outlet area), increasing the wind pressure (wind pressure is proportional to wind speed), increasing the air delivery distance, and increasing the air volume.

[0057] Furthermore, the air outlet duct 4 is inclined, that is, the air outlet duct 4 is not perpendicular to the end face of the volute structure, but rather, a volute tongue 6 with an upward angle is formed between one side of the air outlet duct 4 and the volute structure.

[0058] By setting the volute tongue 6 with an upward angle, wind resistance is reduced and air volume is increased.

[0059] Furthermore, the angle of elevation at point 6 of the worm tongue is 40°.

[0060] By designing the angle of the volute tongue 6 part of the air duct to be 40° (90°-50°), the air volume of the fan is almost entirely blown out from the volute shell connection part 7 on the opposite side of the volute tongue, concentrating the airflow, increasing the airflow pressure, and increasing the air delivery distance and air volume.

[0061] Furthermore, the angle of elevation on the other side of the air outlet duct 4 is 70°.

[0062] By setting the other side of the air outlet duct 4 as a sloping structure with an elevation angle of 70°, the air outlet duct becomes a sloping horn-shaped structure, which reduces wind resistance, overcomes the wind resistance of the entire unit's air duct, and increases air volume.

[0063] Furthermore, the connection between the volute structure and the other side of the air outlet duct 4 has a volute connection part 7, which is a sloping structure with an elevation angle of 70°.

[0064] By designing the connection between the air duct of the volute and the air outlet duct at an elevation angle of 70°, the extended air outlet duct 4 is made to be on the same plane as the volute structure, which maximizes the overcoming of the wind resistance of the whole unit's air duct, increases the air volume, and increases the air delivery distance.

[0065] Furthermore, one of the base 1 and the top cover 2 is provided with a buckle 8, and the other of the base 1 and the top cover 2 is provided with a hook 9. The two are connected by buckle 8 and hook 9.

[0066] The snap-fit ​​connection facilitates quick assembly and disassembly of the base 1 and the top cover 2.

[0067] Furthermore, the top cover 2 is made of a single piece of plastic. Its structure includes mounting screw holes and hooks 9 that engage with the buckles 8 on the base 1. The mounting screw holes are used to engage with the base 1 to fix it to the machine. The hooks 9 are used to ensure that the base 1 and the top cover 2 are tightly fastened together to prevent them from coming loose.

[0068] The present invention provides a fan comprising:

[0069] volute structure; and,

[0070] The impeller rotor is installed in the volute structure.

[0071] The fan also includes a stator assembly 21 installed in the volute structure. The stator assembly includes a magnetic pole conversion device 22 (PCB driver board), a stator core and windings. The base 1 is a plastic shell structure with a central tube 10 formed on it. The stator core and windings are fixed on the central tube 10 of the base 1. The PCB driver board is used to energize the stator windings.

[0072] The fan provided by this invention optimizes the air duct structure, extends the specifications of the outlet air duct, and narrows the inner end of the outlet air duct, which can improve the fan's air pressure and increase the air delivery distance. By setting the volute tongue part at an elevation angle of 40°, the fan's air volume is almost entirely blown out from the connecting part, concentrating the air delivery and more effectively increasing the air delivery distance and air volume. By setting the volute air duct at an elevation angle of 70°, the same as the elevation angle of the connecting part, so that the extended outlet air duct and the volute structure are on the same plane, overcoming the wind resistance of the entire air duct to the maximum extent, increasing the air volume and increasing the air delivery distance.

[0073] Furthermore, a central tube 10 for mounting the impeller rotor is formed inside the base 1, and the impeller rotor is mounted into the central tube 10 via a shaft core 11.

[0074] The impeller rotor is installed into the base 1 by using the central tube 10, which facilitates the installation and fixation of the impeller rotor.

[0075] Furthermore, the impeller rotor includes a guide fan blade 12, a shaft core 11, an oil-impregnated bearing 13, friction-reducing and noise-reducing components, and a permanent magnet, wherein:

[0076] One end of the shaft core 11 is connected to the support seat 19 of the guide fan blade 12, and the other end is suspended outside the end contour line of the guide fan blade 12.

[0077] The oil-impregnated bearing 13 is mounted on the shaft core 11;

[0078] Friction-reducing and noise-reducing components are respectively installed at both ends of the oil-impregnated bearing 13.

[0079] By installing friction-reducing and noise-reducing components at both ends of the oil-impregnated bearing 13, not only is the friction noise of the fan and the impact sound when the fan moves axially reduced, but wear is also reduced.

[0080] During installation, the oil-impregnated bearing 13 in the impeller rotor is pressed into the middle tube 10.

[0081] Furthermore, the friction-reducing and noise-reducing components include a gasket 14 and a first rubber ring 15 disposed between the oil-impregnated bearing 13 and the support seat 19; the gasket 14 is attached to the support seat 19.

[0082] By first setting a wear-resistant shim 14 at one end of the shaft core 11, that is, the end near the guide fan blade 12, the first rubber ring 15 is prevented from rubbing against the injection molded support seat 19 of the guide fan blade 12 and thus being worn. Then, a soft first rubber ring 15 is set. The function of the first rubber ring 15 is to prevent the wear-resistant shim 14 from rubbing against the end face of the oil-impregnated bearing 13 and thus preventing noise. At the same time, it can also solve the problem of impact noise caused by the impact between the wear-resistant shim 14 and the end face of the oil-impregnated bearing 13 when the impeller rotor moves erratically.

[0083] Furthermore, the friction-reducing and noise-reducing components include a second rubber ring 16, a metal snap ring 17, and a plastic snap ring 18 disposed between the oil-impregnated bearing 13 and the central tube 10 of the base 1. The second rubber ring 16 is attached to the end of the oil-impregnated bearing 13; the metal snap ring 17 and the plastic snap ring 18 are both locked in the slot 20 of the shaft core 11.

[0084] A second rubber ring 16 is first set at the other end of the shaft core 11. The function of this soft second rubber ring 16 is to prevent the retaining ring from rubbing against the end face of the oil-impregnated bearing 13 and generating noise. Then a metal retaining ring 17 is set. The function of the metal retaining ring 17 is to prevent the impeller rotor from falling off during the fan drop and to enhance the impeller rotor's drop resistance. After adding the metal retaining ring 17, a plastic retaining ring 18 is added. The function of the plastic retaining ring 18 is to tightly fit the metal retaining ring 17. Because the metal retaining ring 17 is made of metal and cannot be compressed, when the metal retaining ring 17 is placed in the retaining groove 20 of the shaft core 11, the metal retaining ring 17 is in a loose state. During the operation of the impeller rotor, the metal retaining ring 17 will generate relative movement with the shaft core 11 and generate noise. By setting the plastic retaining ring 18 to tightly fit the metal retaining ring 17, the generation of noise is avoided.

[0085] Furthermore, the sum of the thicknesses of the metal snap ring 17 and the plastic snap ring 18 is greater than the height of the slot 20. The slot 20 is opened on the upper part of the shaft core 11 and is opened around the circumference to hold the metal snap ring 17 and the plastic snap ring 18.

[0086] This structural design allows the plastic retaining ring 18 to tightly press against the metal retaining ring 17, preventing relative movement and noise.

[0087] Furthermore, the fan is a brushless DC volute fan.

[0088] In this invention, by adding soft rubber rings to the shaft core of the fan (including both ends of the oil bearing), the friction noise of the fan and the impact sound generated when the fan moves axially can be reduced.

[0089] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A volute structure, characterized in that, The volute structure includes a base with a first cavity and a second cavity. The upper cover; the base and the upper cover are assembled together so that the first cavity and the second cavity form an air duct for airflow; one end of the volute structure extends outward to form an air outlet duct; the air outlet duct is connected to the air duct to allow airflow to flow out; the projected length of the air outlet duct in the horizontal direction is equal to 1 / 3 of the diameter of the volute structure. The air outlet duct has a funnel-shaped structure, with the outer width of the duct being greater than the inner width; the inner width of the air outlet duct is equal to 1 / 3 of the diameter of the volute structure.

2. The volute structure according to claim 1, characterized in that, The air outlet duct is inclined, and a volute tongue with an upward angle is formed between one side of the air outlet duct and the volute structure.

3. The volute structure according to claim 2, characterized in that, The included angle of elevation at the volute tongue is 40°.

4. The volute structure according to claim 2, characterized in that, The included angle of elevation on the other side of the air outlet duct is 70°.

5. The volute structure according to claim 4, characterized in that, The volute structure has a volute connecting part at the connection point with the other side of the air outlet duct. The volute connecting part is a sloping structure with an elevation angle of 70°.

6. The volute structure according to claim 1, characterized in that, One of the base and the top cover is provided with a buckle, and the other of the base and the top cover is provided with a hook. The two are connected by the buckle and the hook.

7. A fan, characterized in that, include: The volute structure as described in any one of claims 1-6; and, The impeller rotor is installed in the volute structure.

8. The fan according to claim 7, characterized in that, The impeller rotor includes guide fan blades, a shaft core, an oil-impregnated bearing, and friction-reducing and noise-reducing components, wherein: One end of the shaft is connected to the support seat of the guide fan blade, and the other end is suspended outside the end contour line of the guide fan blade. The oil-impregnated bearing is sleeved on the shaft core; The friction-reducing and noise-reducing components are respectively installed at both ends of the oil-impregnated bearing.

9. The fan according to claim 8, characterized in that, The friction-reducing and noise-reducing component includes a gasket and a first rubber ring disposed between the oil-impregnated bearing and the support seat; the gasket is attached to the support seat.

10. The fan according to claim 8, characterized in that, The friction-reducing and noise-reducing component includes a second rubber ring, a metal retaining ring, and a plastic retaining ring disposed between the oil-impregnated bearing and the central tube of the base. The second rubber ring is attached to the end of the oil-impregnated bearing. The metal retaining ring and the plastic retaining ring are both secured in the retaining groove of the shaft core.

11. The fan according to claim 10, characterized in that, The sum of the thicknesses of the metal retainer and the plastic retainer is greater than the height of the retainer slot.

12. The fan according to claim 7, characterized in that, The fan is a brushless DC volute fan.

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