WO2024021612A1 - Fan set, heat dissipation apparatus, and electronic device - Google Patents

Abstract

A fan set, a heat dissipation apparatus, and an electronic device. The fan set comprises at least two fans (1); the axes of the fans are parallel to each other; each fan comprises fan blades (12) and an air guide ring (11) spaced apart from the periphery of the fan blades; an inner ring of the air guide ring comprises an outlet section (113). The outlet section comprises: an expansion portion (1131), the diameter of the expansion portion being gradually increased in an air outflow direction of the fan; and a straight portion (1132) which is connected to the tail end of the air outflow direction of the expansion portion, the diameter of the straight portion being kept consistent, and the airflow directions of the fans being parallel to each other after airflow passes through the straight portion. According to the fans, mutual interference of airflow at outlets of a plurality of fans can be avoided, and mutual interference of airflow at outlets of a plurality of fans can be reduced.

Description

Fan units, cooling devices and electronic equipment

Cross-references to related applications

This disclosure claims the priority of Chinese patent application CN202210909821.1 titled "Fan unit, cooling device and electronic equipment" submitted on July 29, 2022, the entire content of which is incorporated into this disclosure by reference.

Technical field

The present disclosure relates to the technical field of fan noise reduction, and in particular to a fan unit, a heat dissipation device and an electronic device.

Background technique

With the development and application of bare Die packaging, 2.5D packaging and 3D packaging, the heat flow density of chips has even doubled. The wired heat flow density has increased by more than 50% with each generation. The required cooling air volume is also increasing, and the fan speed is increasing. High, and the noise is proportional to the sixth power of the fan tip circumferential speed. As people pursue quality of life, their tolerance for noise is getting lower and lower. Therefore, it is urgent to reduce the fan noise from all aspects. When there are multiple air outlets, there is a technical problem of air flow from the air outlets.

Contents of the invention

The main purpose of the present disclosure is to provide a fan unit, a heat dissipation device and an electronic device, aiming to solve the technical problem of air flow at the air outlet.

According to a first aspect of the present disclosure, a fan unit is provided, including: at least two fans, the axes of each fan being parallel to each other. The fan includes fan blades and air guide rings spaced apart from the outer periphery of the fan blades. The inner ring includes an outlet section, and the outlet section includes: an expansion part, the diameter of which gradually increases along the air outlet direction of the fan; and a straight part, which is connected to the end of the expansion part in the air outlet direction, and the diameter of the straight part remains consistent , the airflow directions of each fan are parallel to each other after passing through the straight part.

According to a second aspect of the present disclosure, a heat dissipation device is provided, including the fan group according to any one of the first aspects.

According to a third aspect of the present disclosure, an electronic device is provided, including the heat dissipation device as described in the second aspect.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the technical solutions in the present disclosure or the prior art, the drawings needed to be used in the embodiments or description of the prior art will be briefly introduced below. It is obvious that for those of ordinary skill in the art, Other drawings can also be obtained based on these drawings without incurring any creative effort.

Figure 1 shows a front view of a fan unit provided by Embodiment 1 of the present disclosure;

Figure 2 shows a side view of the outer ring of the air guide ring of the wind turbine set provided by Embodiment 1 of the present disclosure;

Figure 3 is a partial enlarged view based on Figure 2;

Figure 4 shows a front view of the inner ring and the outer ring of the air guide ring of the wind turbine unit provided by Embodiment 1 of the present disclosure;

Figure 5 is a partial enlarged view based on Figure 4;

FIG. 6 shows a top view of the air guide ring of the wind turbine set provided by Embodiment 1 of the present disclosure.

The reference symbols are explained as follows:

1. Fan; 11. Air guide ring; 111. Guide section; 112. Straight section; 1121. Groove; 113. Exit section; 1131. Expansion section; 11311. First arc section; 11312. Second arc section ; 1132. Straight part; 12. Fan blade; 13. Guide vane; 14. Driving member; A. first direction; B. second direction; V. first included angle; R1, first radius; R2, Second radius.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions in the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the present disclosure. Obviously, the described embodiments are part of the implementation of the present disclosure. examples, not all examples. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative efforts fall within the scope of protection of this disclosure.

With the development and application of bare Die packaging, 2.5D packaging and 3D packaging, the heat flow density of chips has even doubled. The wired heat flow density has increased by more than 50% with each generation. The required cooling air volume is also increasing, and the fan speed is increasing. High, and the noise is proportional to the sixth power of the fan tip circumferential speed. With people's pursuit of quality of life, their tolerance for noise It is also getting lower and lower, so it is urgent to reduce the noise of the fan from all aspects.

In some cases, there are many designs for the air guide ring, but most of the ideas focus on resonant cavity silencing. The structure of this air guide ring is mostly double-layered. Due to the large size of these fans, they are mostly used in home appliances and other fields, and there are no size requirements. So sensitive, but in electronic equipment, the fans are small in size and the installation space is limited, so it is impossible to adopt a similar double-layer air guide ring structure.

Therefore, in electronic equipment, multiple fans are usually used in parallel for heat dissipation. The outlets of multiple fans are set in an expanded bell mouth structure, which will cause the outlet airflows of multiple fans to interfere with each other. In order to avoid the outlet airflow of adjacent fans The airflow interferes with each other to produce noise. Many fans have eliminated the commonly used bell mouth structure at the outlet section of the air guide ring, which reduces the performance of the fan to a certain extent.

In view of the above problems, the present disclosure provides a fan unit, a heat dissipation device and an electronic device, and the above-mentioned fan unit, heat dissipation device and electronic device are described in detail with reference to the accompanying drawings.

Regarding the first embodiment of the fan unit

FIG. 1 shows a front view of the fan unit provided by the present disclosure. FIG. 2 shows a side view of the outer ring of the air guide ring of the fan unit provided by the present disclosure. FIG. 3 is a partial enlarged view based on FIG. 2 .

Please refer to FIGS. 1 to 3 . The present disclosure provides a fan unit, including: at least two fans 1 , the axes of each fan 1 being parallel to each other. The fan 1 includes fan blades 12 and spacers spaced around the periphery of the fan blades 12 . The inner ring of the air guide ring 11 includes an outlet section 113. The outlet section 113 includes: an expansion part 1131. The diameter of the expansion part 1131 gradually increases along the air outlet direction of the fan 1; and a straight part 1132, which connects At the end of the expansion portion 1131 in the air outlet direction, the diameter of the straight portion 1132 remains consistent, and the airflow directions of each fan 1 become parallel to each other after passing through the straight portion 1132 .

Wherein, by arranging at least two fans 1 with mutually parallel axes, the arrangement of at least two fans 1 with mutually parallel axes includes: at least two fans 1 are arranged in parallel, which further includes: at least two fans 1 along the same radial direction Arrange, or at least two fans 1 are distributed in a matrix. In addition, at least two fans 1 may also be arranged in other ways, as long as the axes of all fans 1 are parallel, which all fall within the protection scope of the present disclosure and will not be described again here.

Therefore, the fan 1 has an air guide ring 11 provided on the periphery of the fan blade 12. The inner ring of the air guide ring 11 is provided with an outlet section 113, and the outlet section 113 is first expanded to form an expansion portion 1131, and then a straight portion with a constant diameter is formed. Section 1132 not only ensures the pressure expansion effect, but also ensures that the airflows of each fan 1 do not interfere with each other after exiting the outlet section 113.

It should be understood that the air guide ring 11 has a cylindrical structure, and the cross section of the air guide ring 11 taken by a plane perpendicular to its axis is annular. The inner surface of the air guide ring 11 is the inner ring, and the air guide ring 11 is an inner ring. The outer surface of ring 11 is the outer ring. The diversion in this embodiment The section 111, the outlet section 112 and the straight section 113 are all the structure of the inner ring of the air guide ring 11. Since the shapes of the inner ring and the outer ring are exactly the same, and the inner ring structure is not convenient to be shown in the figure, the guide section 111, outlet Segment 112 and straight section 113 are respectively shown in the external structural view of the outer ring in FIG. 2 and in the enlarged partial view of the outer ring in FIG. 3 .

Please continue to refer to Figure 3. The straight portion 1132 extends along the axis direction of the fan 1. It can be seen that multiple fans 1 are arranged side by side along a straight line in the radial direction. The outlet sections 113 of the multiple fans 1 first expand the wind pressure. Then, the airflows of the outlet sections 113 of the multiple fans 1 are led out along the axial direction respectively through the straight portions 1132, so that the airflows of the outlet sections 113 of the multiple fans 1 are parallel to each other to prevent the airflows from interfering with each other.

Regarding the specific expansion method of the expansion part 1131, the expansion part 1131 includes: a first arc segment 11311; and a second arc segment 11312. One end of the first arc segment 11311 is connected to one end of the second arc segment 11312. The second arc segment 11312 is The other end is connected to the straight part 1132. Moreover, the center of the first arc segment 11311 is located outside the air guide ring 11 , and the center of the second arc segment 11312 is located inside the air guide ring 11 , that is, the first arc segment 11311 is recessed toward the inside of the air guide ring 11 , and the second arc segment 11312 is located toward the inside of the air guide ring 11 . It bulges toward the outside of the wind ring 11 .

Therefore, the outlet section 113 is composed of a first arc section 11311, a second arc section 11312 and a straight section 1132. One end of the first arc section 11311 with a radius R1 is tangent to the straight section 112, and the other end is tangent to the straight section 112 with a radius R2. One end of the second arc segment 11312 is tangent to the straight portion 1132 , and the other end of the second arc segment 11312 with a radius R2 is tangent to the straight portion 1132 . That is, the first radius of the first arc segment 11311 is R1, the center of the circle of the first arc segment 11311 is located outside the inner circle, the second radius of the second arc segment 11312 is R2, and the center of the circle of the second arc segment 11312 is located on the inner circle. within, and R1 ≤ R2, so the inner diameter of the expansion portion 1131 increases gradually from the first arc section 11311 to the second arc section 11312, ensuring that the wind pressure continues to increase.

Among them, one end of the first arc segment 11311 smoothly transitions to one end of the second arc segment 11312, and the other end of the second arc segment 11312 smoothly transitions to the straight portion 1132, so that the wind pressure increases continuously, and the inner wall of the expansion portion 1131 decreases due to The influence of angles such as corners causes the airflow to hit the corners, producing greater noise, which serves as a noise reduction function.

Those skilled in the art need to know that the above-mentioned outlet section 113 can also be realized by using other splines and other curves or diagonal lines, as long as a flow channel can be formed to expand and then shrink to the level.

Figure 4 shows a front view of the inner ring and the outer ring of the air guide ring of the wind turbine unit provided by Embodiment 1 of the present disclosure. Figure 5 is a partial enlarged view based on Figure 4. Figure 6 shows the embodiment of the present disclosure. 1. A top view of the air guide ring of the fan unit provided.

Please refer to Figures 4-6. The inner ring also includes: a straight section 112. The outlet section 113 is connected to the end of the straight section 112 in the air outlet direction. The straight section 112 is provided with at least one groove 1121. The groove 1121 The depth direction of extends along the radial direction of the fan 1.

On the one hand, since there is a certain distance between the fan blade 12 and the air guide ring 11, and the wind pressure at the outlet section 113 of the fan 1 is greater than the air guide ring 11, The wind pressure in the flow section 111 will cause the airflow backflow problem at the top of the fan blade 12, resulting in leakage vortex; on the other hand, since the distance between the inner ring of the air guide ring 11 and the top of the fan blade 12 is the same, the fan blade 12 is During the rotation process, the airflow is periodically flapped, and the airflow hits the inner ring of the wind guide group almost simultaneously. The noise generated is of the same frequency, and the overall noise peak value is high.

Please continue to refer to Figures 4 and 5. In order to improve the above problems, the present disclosure is provided with at least two grooves 1121 spaced apart along the circumferential direction in the straight section 112. On the one hand, during the backflow process, part of the airflow The airflow entering the groove 1121 can effectively reduce the leakage of the airflow at the top of the fan blade 12 from the outlet section 113 of the fan 1 to the guide section 111, thereby improving the overall performance of the axial flow fan 1 system and thereby improving the top of the fan blade 12. The problem of leaking vortex; on the other hand, the fan blade 12 periodically beats the airflow during the rotation process, and the inner ring of the entire air guide ring 11 is arranged with at least two grooves 1121. Since the top of the fan blade 12 is far away from the inner ring of the air guide ring 11 There is a difference in the distance, and there is a time difference when the airflow hits the inner ring of the air guide ring 11, so it will be dispersed at different frequencies, reducing the peak value of discrete noise. In addition, the groove 1121 is set on the straight section 112, Easy to process.

In an exemplary embodiment, the maximum depths of at least two grooves 1121 are different along the radial direction, so that there is a difference in the distance between the top of the fan blade 12 and the bottom of the at least two grooves 1121 , and the fan blade 12 There is also a difference between the distance between the top of the groove 1121 and the bottom of the groove 1121 and the distance between the middle position of the adjacent groove 1121 and the inner ring of the air guide ring 11. There are differences in time when the airflow hits the inner ring of the air guide ring 11. The differences are therefore spread out over more different frequencies, further reducing the peak value of discrete noise.

In an exemplary embodiment, the radial maximum depth D of the groove 1121 is greater than or equal to 2% of the radius of the blade 12 of the fan 1 , and is less than or equal to 7% of the radius of the blade 12 of the axial flow fan 1 . If the maximum radial depth D of the groove 1121 is less than 2% of the radius of the fan blade 12 of the fan 1, it will not be able to improve the leakage vortex at the top of the fan blade 12. If the maximum radial depth D of the groove 1121 is greater than that of the fan 1 1 is 7% of the radius of the fan blade 12, then part of the airflow from the guide section 111 to the outlet section 113 will be affected, and the outlet wind pressure cannot be guaranteed.

In an embodiment of the present disclosure, at least two grooves 1121 have different cross-sectional shapes along the radial direction, and the cross-sectional shapes include at least one of: V-shaped, circular, and elliptical. The two adjacent grooves 1121 in the inner ring of the air guide ring 11 of the fan 1 have different shapes. The inner ring of the entire air guide ring 11 can be arranged at intervals with two or more grooves 1121 in V-shaped, circular and elliptical cross-sectional shapes. Among them, the V-shaped, circular and elliptical shapes have different maximum distances from the top of the fan blade 12 . In addition, the cross-sectional shape of the groove 1121 along the radial direction can also have other choices, such as polygon, etc., as long as the cross-sectional shape of the different grooves 1121 ensures that the distance between the top of the fan blade 12 and the bottom of the groove 1121 is different, so as to achieve further reduction. Just make noise.

Please continue to refer to FIG. 6 . A plurality of grooves 1121 are arranged at equal intervals in the inner ring of the air guide ring 11 along the circumferential direction. The extending direction of the grooves 1121 is arranged along the first direction A. The extending direction of the grooves 1121 is concave. The extending direction of the groove bottom of groove 1121, fan blade 12 The edge of the fan blade 112 is arranged along the second direction B. The edge of the fan blade 112 is the extension direction of the outermost edge of the top of the fan blade 112. Since the bottom of the groove 1121 and the top of the fan blade 112 may be curves, when either of them When it is a curve, take the tangent line at the midpoint of the curve as the first direction A or the second direction B. The first direction A and the second direction B form a first included angle V. The value range of the first included angle V is 60°-90°. In an exemplary embodiment, the first included angle V is 90°. The first direction A and the second direction B form an included angle to ensure that the extension direction of each groove 1121 is not parallel to the periphery of the fan blade 12. During the airflow return process, due to the existence of the first included angle V, and the first The included angle V is determined by the central arc line of the fan blade 12. Under the force of the rotation of the fan blade 12, the return airflow can better drive the return airflow into the groove 1121, thereby further improving the leakage vortex at the top of the fan blade 12. The problem.

In addition, please continue to refer to Figure 2. The inner ring also includes a guide section 111. The end of the guide section 111 in the air outlet direction is connected to the other end of the straight section 112. The diameter of the guide section 111 is larger than that of the straight section 112. diameter, the wind pressure decreases, so that the airflow passes through the guide section 111 and enters the straight section 112 smoothly. After being expanded by the diffuser section, the airflow exits from the straight section 1132.

In an embodiment of the present disclosure, please continue to refer to FIG. 1 , where the fan 1 is an axial flow fan 1 . Among them, the axial flow fan 1 is a fan 1 that uses the thrust of the fan blades 12 to force the gas to flow in the axial direction. It is usually composed of fan blades 12, guide vanes 13, air guide ring 11, driving part 14 and crankshaft, among which, guide vanes 13. Also known as "guide vane", it includes a front guide vane and a rear guide vane arranged oppositely. There is an air guide ring 11 between the front guide vane and the rear guide vane. The air guide ring 11 is provided with a driving part 14 and an output end of the driving part 14. The connected crankshaft, and at least two fan blades 12 arranged around the crankshaft. When the driving member 14 rotates in the guide blade 13 through the crankshaft with the fan blades 12, a certain installation angle between the crankshaft and the propeller-shaped fan blades 12 generates thrust on the gas, pushing the gas to flow continuously along the crankshaft direction, causing the gas to flow continuously along the crankshaft direction. Continuously inhaling and expelling.

In another embodiment of the present disclosure, the fan 1 is a diagonal flow fan 1 . The oblique flow fan 1, also known as the mixed flow fan 1, is a fan 1 between the axial flow fan 1 and the centrifugal fan 1. The impeller of the oblique flow fan 1 allows the air to move both centrifugally and axially. The movement of air is a mixture of axial flow and centrifugal movement.

Regarding the second embodiment of the heat dissipation device

Based on the first embodiment, this embodiment provides a heat dissipation device, including the fan unit described in the first embodiment.

Third Embodiment Regarding Electronic Equipment

Based on the first embodiment and the second embodiment, this embodiment provides an electronic device, including the The heat dissipation device described above. In an exemplary embodiment, the electronic device in this embodiment may be a communication device (which may be a base station), a switching device, a computer, etc. The electronic device provided by the present disclosure has the same technical advantages as the wind turbine unit of the first embodiment, which will not be described again here.

According to a fan unit, heat dissipation device and electronic equipment provided by the present disclosure, the fan unit includes: at least two fans, the axes of each fan are parallel to each other, the fan includes fan blades and air guide rings spaced on the outer periphery of the fan blades. The inner ring of the wind ring includes an outlet section. The outlet section includes: an expansion part, the diameter of which gradually increases along the air outlet direction of the fan; and a straight part, connected to the end of the expansion part in the air outlet direction. The diameter remains the same, and the airflow directions of each fan are parallel to each other after passing through the straight part. The present disclosure sets at least two fans with axes parallel to each other, and the fans have an air guide ring located on the periphery of the fan blades. The inner ring of the air guide ring is equipped with an outlet section, and the outlet section is first expanded to form an expansion part, and then an air guide ring with a different diameter is formed. The straight part not only ensures the expansion effect, but also ensures that the air flows of each fan do not interfere with each other after exiting the outlet section. That is, the pressure expansion of the air outlet of the fan unit is achieved and the air flows of each air outlet do not interfere with each other.

It should be noted that in this article, relational terms such as “first” and “second” are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Furthermore, the terms "comprises," "comprises," or any other variations thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed other elements, or elements inherent to the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

The above descriptions are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the disclosure. Therefore, the present disclosure is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (13)

1. A fan unit, including at least two fans, the axes of each of the fans being parallel to each other, the fans including fan blades and air guide rings spaced on the outer periphery of the fan blades, the inner ring of the air guide ring includes an outlet section, the exit section includes:

   Expansion part, the diameter of the expansion part gradually increases along the air outlet direction of the fan; and

   The straight portion is connected to the end of the expansion portion in the air outlet direction, the diameter of the straight portion remains consistent, and the air flow directions of each fan are parallel to each other after passing through the straight portion.
2. The fan assembly according to claim 1, wherein the straight portion extends along an axial direction of the fan.
3. The wind turbine unit according to claim 1 or 2, wherein the expansion part includes:

   first arc segment; and

   A second arc segment, one end of the first arc segment is connected to one end of the second arc segment, and the other end of the second arc segment is connected to the straight portion.
4. The wind turbine unit according to claim 3, wherein the center of the circle of the first arc segment is located outside the air guide ring, and the center of the circle of the second arc segment is located inside the air guide ring.
5. The fan unit according to claim 1, wherein the inner ring further includes: a straight section, the outlet section is connected to the end of the straight section in the air outlet direction, and the straight section is provided with at least one concave section. The depth direction of the groove extends along the radial direction of the fan.
6. The wind turbine assembly according to claim 5, wherein the straight section is provided with at least two grooves spaced apart in the circumferential direction.
7. The fan unit according to claim 5 or 6, wherein the extension direction of the groove is arranged along the first direction, the edge of the fan blade is arranged along the second direction, the first direction and the second direction Form the first included angle.
8. The wind turbine unit according to claim 7, wherein the first included angle ranges from 60° to 90°.
9. The wind turbine assembly according to claim 5, wherein at least two of the grooves have different maximum depths along the radial direction.
10. The wind turbine assembly according to claim 6, wherein at least two of the grooves have different cross-sectional shapes along the radial direction.
11. The fan unit according to claim 1, wherein the fan is an axial flow fan or an oblique flow fan.
12. A heat dissipation device, including the fan unit according to any one of claims 1-11.
13. An electronic device including the heat dissipation device according to claim 12.