Side spray low noise fan

Abstract

This invention relates to the field of heat dissipation device technology, and in particular to a side-spray low-noise fan, comprising a fan body and a diffuser. By setting a groove on the side of the top wall near the fan body, and forming a protrusion within the groove, the high-speed airflow, during its process of being ejected through the jet hole, passing through the gap, and then being injected into the diffuser through the first diffuser channel, has high inertia, which increases the airflow at the outlet and improves heat dissipation efficiency. Moreover, the high-speed airflow will entrain the gas in the outer circumferential region of the area opposite the jet hole and the protrusion within the gap. Since the outer circumference of the protrusion is a groove, the flow area of ​​the gas flow channel in the outer circumferential region of the area adjacent to the jet hole and the protrusion is increased, and the flow resistance is reduced. The outer circumferential gas can be entrained more quickly and timely and mixed with the high-speed gas jet to reduce the maximum velocity at the jet center, reduce the velocity distribution difference between the airflow center and the edge, and achieve the purpose of noise suppression.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation device technology, and more particularly to a side-spray low-noise fan. Background Technology

[0002] Placing micro-sized fans as heat dissipation devices within the internal space of 3C electronic terminal products is considered to generate significant thermal benefits. Because 3C smart terminals differ from consumables, they impose stringent stability and reliability requirements on components housed within their internal space. For micro-sized fans, ensuring sufficient airflow output while minimizing operating noise to avoid impacting user experience is currently a key concern in the industry.

[0003] Piezoelectric fans are a typical example of micro-volume fans. Existing piezoelectric fans are classified into two types based on their outflow direction: front-jet and side-jet. Compared to front-jet fans, side-jet fans have lateral air outlets, with the heat source positioned in the outflow direction. Their thickness is easier to control, greatly facilitating their installation in the confined spaces of 3C products. A side-jet fan can be constructed by combining a front-jet fan with a deflector. The deflector is spaced at least on one side of the fan. Airflow is ejected from the front-jet fan and deflected after entering the deflector. Because the initial airflow direction is inconsistent with the final outflow direction, the airflow needs to undergo a large-angle deflection within the space. This process results in energy loss, leading to insufficient airflow from the side outlet and failing to achieve efficient heat dissipation. Furthermore, the high-speed airflow, after passing through the gap between the fan and the deflector and entering the deflector through an inlet, generates harsh noise due to the significant difference in velocity distribution between the airflow center and edges. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that the side-jet fan of the prior art has insufficient lateral outflow and also generates noise, a side-jet low-noise fan is provided.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a side-jet low-noise fan, including a fan body and a flow guide disposed on one or both sides of the fan body with a gap, wherein the flow guide guides the airflow generated by the fan body to be ejected in a set direction;

[0006] The fan body has at least two jet holes on the side near the air intake, and the airflow generated by the fan body is ejected through the jet holes;

[0007] The drainer includes a drain cavity formed by a top wall, a bottom wall and a side wall connecting the top wall and the bottom wall. The drain cavity extends in a set direction and penetrates the side wall, and forms an outlet at the penetration point of the side wall. The top wall is located close to the fan body. The area of ​​the top wall opposite to at least two jet holes is respectively provided with a first drain channel that corresponds one-to-one with the jet holes and penetrates the top wall.

[0008] The drainage cavity is provided with second drainage channels that are distributed at intervals corresponding to the first drainage channel. The first drainage channel and the corresponding second drainage channel are connected. The second drainage channel is connected to the outlet.

[0009] At least one recessed groove is provided on the side of the top wall near the fan body. The bottom of the recessed groove protrudes towards the fan body with a protrusion corresponding to the first airflow channel. The protrusion is arranged around the outer periphery of the corresponding first airflow channel. The outer contour line of the top surface of the protrusion forms a central area. The orthographic projection of the jet hole on the top wall is located within the corresponding central area.

[0010] Furthermore, the flow area of ​​the second diversion channel gradually increases along the extension path from the second diversion channel to the outlet.

[0011] Furthermore, the top surface of the protrusion does not protrude beyond the side surface of the top wall facing the fan body.

[0012] Furthermore, the flow area of ​​the first drainage channel is larger than the flow area of ​​the jet hole opposite it.

[0013] Furthermore, the cross-sectional shape of the jet hole, the protrusion, and the first drainage channel penetrating the protrusion are all circular;

[0014] The axial distance between the outlet end face of the jet hole and the inlet end face of the first guide channel is h, the diameter of the jet hole is d1, the diameter of the first guide channel opposite to the jet hole is d2, the diameter of the outer contour line of the top surface of the protrusion is d3, the maximum axial length of the first guide channel is l, and the jet angle formed by the airflow ejected from the jet hole is α.

[0015] The constraints are:

[0016] 1.1≤d2 / d1≤1.7, 1.1≤d3 / d2≤1.9;

[0017] (d2-d1) / 2(h+l) <arctan(α / 2)<(d2-d1) / 2h。

[0018] Furthermore, the inner peripheral edge of the top surface of the protrusion is provided with an inner peripheral rounded corner transition area, or / and the outer peripheral edge of the top surface of the protrusion is provided with an outer peripheral rounded corner transition area.

[0019] Furthermore, the side of the protrusion has a draft angle β, 5°≤β≤40°.

[0020] Furthermore, at least one second drainage hole is provided at the end of the sidewall surrounding the drainage cavity away from the outlet. The second drainage hole penetrates the sidewall and communicates with the drainage port of at least one second drainage channel. The drainage port is located between the first drainage channel corresponding to the second drainage channel and the outlet.

[0021] Furthermore, the top wall has a first drainage area corresponding to the first drainage channel. The first drainage area is an adjacent area on the top wall located on the outer periphery of the corresponding first drainage channel. The first drainage area is located inside or outside the settling tank and on the outer side of the protrusion.

[0022] The bottom wall has a second drainage area that corresponds one-to-one with the first drainage area, and the second drainage area and the corresponding first drainage area are directly opposite each other;

[0023] At least one of the first drainage areas and / or at least one of the second drainage areas has a first drainage hole communicating with the second drainage channel.

[0024] Furthermore, the first drainage hole is located in the region opposite to the extension path of the second drainage channel toward the outlet.

[0025] Furthermore, each of the second drainage channels is individually connected to the first drainage hole, and the first drainage hole is provided on the top wall.

[0026] Furthermore, each of the second drainage channels is connected to the same outlet.

[0027] Furthermore, the flow areas of at least two of the jet orifices are the same or different.

[0028] Furthermore, it also includes a partition plate, through which the fan body engages with the air intake;

[0029] The partition plate consists of multiple partitions discretely disposed between the fan body and the top wall. The opening between two adjacent partitions forms a flow passage, which allows external ambient gas to enter the gap between the fan body and the air duct.

[0030] Alternatively, the partition plate may be a continuous partition plate with a closed-loop structure disposed between the fan body and the top wall. The partition plate is provided with at least one hole structure or groove structure, which constitutes a flow passage, allowing external ambient gas to enter the gap between the fan body and the duct.

[0031] The beneficial effects of this invention are:

[0032] 1) In this invention, a groove is provided on the side of the top wall near the fan body, and a protrusion is formed by the bottom surface of the groove protruding towards the fan body. The first guide channel, which corresponds one-to-one with the jet hole, penetrates the top wall and the protrusion on the top wall. During the process of the high-speed airflow being ejected through the jet hole, passing through the gap between the fan body and the guide, and then being injected into the guide through the first guide channel, the gas in the outer circumferential area of ​​the area opposite the jet hole and the protrusion in the gap is entrained. Since the outer circumferential area of ​​the protrusion is a groove structure, it is equivalent to increasing the flow area of ​​the gas flow channel in the outer circumferential area of ​​the area opposite the jet hole and the protrusion, reducing the flow resistance. The gas in the outer circumferential area can be entrained more quickly and timely and mixed with the high-speed gas jet to reduce the maximum velocity of the jet center, reduce the velocity distribution difference between the airflow center and the edge, and achieve the purpose of noise suppression.

[0033] 2) In this invention, the jet generated by the jet hole of the fan body enters the corresponding first guide channel after passing through the gap. The gas in the outer circumferential region of the area where the jet hole and the protrusion are opposite in the gap is entrained to form a primary guide. After the airflow is rectified by the first guide channel, it has high inertia and can still maintain a certain momentum to flow through the second guide channel and finally be ejected from the outlet on the side wall, thereby increasing the airflow at the outlet and improving the heat dissipation efficiency.

[0034] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This is a schematic diagram of the side-spray low-noise fan of the present invention;

[0037] Figure 2 This is a schematic diagram showing the interaction between the protrusions, the first drainage channel, and the jet hole when all the protrusions are located in the same settling tank.

[0038] Figure 3 This is a schematic diagram showing that when all the protrusions are located in the same sink, the orthographic projection of the jet holes on the top wall is located in the relative central area (the dotted line in the diagram represents the orthographic projection of the jet holes on the top wall).

[0039] Figure 4 This is a schematic diagram showing the interaction between the protrusion, the first drainage channel, and the jet hole when each protrusion is set in an independent sink.

[0040] Figure 5This is a schematic diagram showing the interaction between the protrusions, the first drainage channel, and the jet orifice when each protrusion is set in an independent settling tank (the dashed lines in the diagram represent the orthogonal projection of the jet orifice onto the top wall).

[0041] Figure 6 This is a schematic diagram showing the structural dimensions of the jet orifice, protrusion, and first drainage channel.

[0042] Figure 7 This is a schematic diagram showing that the inner and outer peripheral edges of the top surface of the protrusion are respectively provided with inner peripheral rounded corner transition areas and outer peripheral rounded corner transition areas;

[0043] Figure 8 This is a schematic diagram showing the draft angle on the side of the protrusion;

[0044] Figure 9 It is a schematic diagram of the jet hole, the first drainage channel, and the first drainage hole projected onto the cross section of the side wall;

[0045] Figure 10 It is a schematic diagram showing the jet hole, the first drainage channel, and the first drainage hole projected onto the cross section of the side wall, and having multiple outlets;

[0046] Figure 11 This is a schematic diagram of a drainage device with a plate-like structure of varying thickness on the top wall;

[0047] Figure 12 It is a cross-sectional schematic diagram of a flow guide whose width gradually increases in the longitudinal direction where the second flow channel intersects with the extension path of the second flow channel toward the outlet.

[0048] Figure 13 This is a schematic diagram of the drainage device with a second drainage hole;

[0049] Figure 14 This is a schematic diagram showing the first and second drainage holes of the drainage device;

[0050] Figure 15 This is a schematic diagram of the partition plate installed on the side-spray low-noise fan of the present invention.

[0051] In the diagram: 1. Fan body; 11. Jet nozzle;

[0052] 2. Drainage device; 21. Top wall; 211. Settling tank; 22. Side wall; 23. Bottom wall; 2-1. First drainage channel; 2-2. Second drainage channel; 2-2a. Drainage port; 2-3. Outlet; 2-4. First drainage hole; 2-5. Second drainage hole;

[0053] 3. Protrusion; 3a. Outer contour line; 31. Inner peripheral rounded corner transition area; 32. Outer peripheral rounded corner transition area; 33. Side surface;

[0054] 4. Partition plate; 41. Flow hole; 4-1. Gap;

[0055] h, the axial distance between the outlet end face of the jet orifice and the inlet end face of the first guide channel;

[0056] d1, the diameter of the jet orifice;

[0057] d2, the diameter of the first drainage channel opposite to the jet orifice.

[0058] d3, the diameter of the outer contour line of the top surface of the protrusion.

[0059] l. Maximum axial length of the first drainage channel;

[0060] α, The jet angle formed by the airflow exiting the jet orifice;

[0061] β, Draft angle of the protruding part. Detailed Implementation

[0062] The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner. Therefore, they only show the components relevant to the invention, and the orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be limiting, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0063] Example 1

[0064] like Figures 1-12 As shown, a side-spraying low-noise fan includes a fan body 1 and an air guide 2 disposed on one or both sides of the fan body 1 with a gap 4-1. The air guide 2 guides the airflow generated by the fan body 1 to be sprayed out in a set direction. The set direction refers to the direction in which the outlet 2-3 of the side-spraying low-noise fan in this embodiment faces the heat source, thereby realizing the heat dissipation of the heat source by using the side-spraying low-noise fan in this embodiment.

[0065] The fan body 1 has at least two jet holes 11 on the side near the air intake 2. The flow areas of the at least two jet holes 11 can be the same or different. In this embodiment, the cross-sectional shape of the jet holes 11 is circular, and the flow areas of at least two jet holes 11 are the same, but this does not constitute a limitation of the present invention. The fan body 1 in this embodiment can be any type of fan with at least two air outlets in the prior art, especially any type of piezoelectric fan with at least two air outlets in the prior art. The airflow generated by body 1 is ejected from the air outlet, which is the jet hole 11 in this embodiment. For example, the fan body 1 in this embodiment may be, but is not limited to, the fluid generating device disclosed in Chinese Patent No. CN119084287A, the hole in that patent corresponds to the jet hole 11 in this embodiment. The fan body 1 in this embodiment may also be a high-order resonant fluid generating device disclosed in Chinese Patent No. CN118979867A, the hole in that patent corresponds to the jet hole 11 in this embodiment.

[0066] The airflow generated by the fan body 1 is ejected through the jet hole 11; the airflow guide 2 includes an airflow cavity formed by a top wall 21, a bottom wall 23 and a side wall 22 connecting the top wall 21 and the bottom wall 23. The airflow cavity extends in a set direction and penetrates the side wall 22, and an outlet 2-3 is formed at the penetration point of the side wall 22. The top wall 21 is located close to the fan body 1. The area of ​​the top wall 21 opposite to at least two jet holes 11 is respectively provided with a first airflow channel 2-1 corresponding to each jet hole 11 and penetrating the top wall 21; the cross-sectional shape of the first airflow channel 2-1 and the protrusion 3 can be circular, square, rectangular, elliptical or other shapes, and is not limited here;

[0067] At least one recessed groove 211 is provided on the side of the top wall 21 near the fan body 1. The recessed groove 211 is a groove structure recessed on the surface of the top wall 21 near the fan body 1, facing away from the fan body 1. The bottom of the recessed groove 211 protrudes towards the fan body 1 with a protrusion 3 corresponding to the first airflow channel 2-1. The protrusion 3 surrounds the outer periphery of the corresponding first airflow channel 2-1. The outer contour line 3a of the top surface of the protrusion 3 encloses a central area. The top surface of the protrusion 3 is the surface of the protrusion 3 near the fan body 1. The orthographic projection of the jet holes 11 on the top wall 21 is entirely located within the corresponding central area. In other words, the area of ​​the central area opposite the fan body 1 covers the corresponding jet holes 11. It is easy to understand that there can be only one recessed groove 211, and all the protrusions 3 are disposed within the recessed groove 211. Figure 2-3 As shown, Figure 3The dashed lines in the figure represent the orthographic projection of the jet orifice 11 onto the top wall 21; of course, there can be multiple sinks 211, for example, the protrusions 3 are arranged one-to-one with the jet orifices 11, and each protrusion 3 is disposed in an independent sink 211, such as Figure 4 and 5 As shown, Figure 5 The dashed line in the figure represents the orthographic projection of the jet hole 11 onto the top wall 21.

[0068] Preferably, the top surface of the protrusion 3 does not protrude beyond the surface of the top wall 21 facing the fan body 1, that is, the height of the protrusion 3 hardly exceeds the surface of the top wall 21 facing the fan body 1. Of course, considering the processing errors in actual engineering, if the height of the protrusion 3 slightly exceeds the surface of the top wall 21 facing the fan body 1, it is also considered to be almost not exceeding. Specifically, the top surface of the protrusion 3 can be coplanar with the surface of the top wall 21 near the fan body 1.

[0069] The flow area of ​​the first drainage channel 2-1 is larger than the flow area of ​​the jet hole 11 opposite it; the structural dimensional relationship between each orifice, channel and protrusion 3 is described by the fact that the cross-sectional shape of the jet hole 11, the protrusion 3 and the first drainage channel 2-1 that penetrates the protrusion 3 are all circular.

[0070] Assuming the axial distance between the outlet end face of jet orifice 1 and the inlet end face of the first guide channel 2-1 is h, the diameter of jet orifice 11 is d1, the diameter of the first guide channel 2-1 opposite to jet orifice 11 is d2, the diameter of the outer contour line 3a of the top surface of the protrusion 3 is d3, the maximum axial length of the first guide channel 2-1 is l, and the jet angle formed by the airflow ejected from jet orifice 11 is α, as follows... Figure 6 As shown;

[0071] The constraints are:

[0072] 1.1≤d2 / d1≤1.7, 1.1≤d3 / d2≤1.9;

[0073] (d2-d1) / 2(h+l) <arctan(α / 2)<(d2-d1) / 2h。

[0074] Therefore, on the one hand, it can ensure that the airflow ejected from the jet hole 11 can be completely contained by the first guide channel 2-1 opposite to it, avoiding flow loss caused by airflow overflow; on the other hand, it can improve the compactness of the structure.

[0075] Ideally, the inner peripheral edge of the top surface of the protrusion 3 is provided with an inner peripheral rounded corner transition area 31, or the outer peripheral edge of the top surface of the protrusion 3 is provided with an outer peripheral rounded corner transition area 31, or the top surface of the protrusion 3 is provided with both an inner peripheral rounded corner transition area 31 and an outer peripheral rounded corner transition area 31; thereby reducing the flow resistance when the airflow flows along the wall and suppressing the gas turbulence that may occur at right-angle positions, such as Figure 7 As shown.

[0076] Ideally, the side surface 33 of the protrusion 3 has a draft angle β, where 5° ≤ β ≤ 40°. The protrusion 3 can have a draft angle β on one or more sides 33, or all sides 33 can have a draft angle β. Figure 8 As shown, this facilitates demolding during injection molding.

[0077] In addition, the drainage cavity is provided with second drainage channels 2-2 corresponding to the first drainage channel 2-1 at intervals. The first drainage channel 2-1 and the corresponding second drainage channel 2-2 are connected. The second drainage channel 2-2 is connected to the outlet 2-3. Each second drainage channel 2-2 can be connected to the same outlet 2-3. Figure 9 As shown, the drainage cavity can also extend in a set direction and penetrate the side wall 22 to form multiple outlets 2-3, with the second drainage channel 2-2 communicating with the corresponding outlets 2-3, such as... Figure 10 As shown; there can even be multiple outlets 2-3, and the same outlet 2-3 can be connected to one or two or more second drainage channels 2-2.

[0078] The flow area of ​​the second diversion channel 2-2 gradually increases along the extension path from the second diversion channel 2-2 to the outlet 2-3, so that the airflow decelerates and recovers pressure while flowing through the second diversion channel 2-2, thereby increasing the flow rate.

[0079] It is easy to understand that the jet hole 11 set on the fan body 1 is opposite to the top wall 21 of the guide 2, while the outlet 2-3 is set on the side wall 22 that forms the guide cavity. After the airflow is ejected from the jet hole 11 of the fan body 1, the flow direction is deflected under the action of the guide 2, so that the fan in this embodiment has the function of lateral jet flow.

[0080] The top wall 21 has a first drainage area corresponding to the first drainage channel 2-1. The first drainage area is the adjacent area on the outer periphery of the corresponding first drainage channel 2-1 on the top wall 21. The first drainage area is located on the outside of the protrusion 3. That is to say, the first drainage area can be located inside the sink 211 or outside the sink 211.

[0081] The bottom wall 23 has a second drainage area that corresponds one-to-one with the first drainage area, and the second drainage area and the corresponding first drainage area are directly opposite each other;

[0082] At least one of the first drainage regions and / or at least one of the second drainage regions is permeated by a first drainage hole 2-4 communicating with the second drainage channel 2-2; that is, the first scheme is: the first drainage region is permeated by a first drainage hole 2-4 communicating with the second drainage channel 2-2; the second scheme is: the second drainage region is permeated by a first drainage hole 2-4 communicating with the second drainage channel 2-2; the third scheme is: the first drainage region is permeated by a first drainage hole 2-4 communicating with the second drainage channel 2-2, and the second drainage region is also permeated by a first drainage hole 2-4 communicating with the second drainage channel 2-2; thus, by setting the first drainage hole 2-4 in the adjacent region of the first drainage channel 2-1 corresponding to the second drainage channel 2-2, the technical effect achieved is to fully utilize the high inertia of the airflow after rectification by the first drainage channel 2-1; the configuration relationship between the jet hole 11, the first drainage channel 2-1, the second drainage channel 2-2, the first drainage hole 2-4, and the outlet 2-3 is as follows: Figure 1 , Figures 9-10 As shown.

[0083] Preferably, the first drainage hole 2-4 is located in the region of the first drainage area and / or the second drainage area opposite to the extension path of the second drainage channel 2-2 toward the outlet 2-3. That is, the first drainage hole 2-4 is located in the direction of the extension path of the second drainage channel 2-2 toward the outlet 2-3. When the first drainage hole 2-4 is disposed on the bottom wall 23, it is offset from the first drainage channel 2-1; that is, when the first drainage hole 2-4 is disposed on the bottom wall 23, the first drainage hole 2-4 and the first drainage channel 2-1 are not opposite each other.

[0084] More preferably, each second drainage channel 2-2 is equipped with a first drainage hole 2-4, and the first drainage holes 2-4 are all disposed on the top wall 21, such as... Figure 11 As shown.

[0085] In this embodiment, the specific structure of the second drainage channel 2-2 can be as follows:

[0086] The top wall 21 has a plate-like structure with varying thickness; along the extension path from the second inlet channel 2-2 to the outlet 2-3, the thickness of the top wall 21 opposite to the second inlet channel 2-2 gradually decreases, so that the flow area of ​​the second inlet channel 2-2 gradually increases along the extension path from the second inlet channel 2-2 to the outlet 2-3, such as... Figure 11 As shown;

[0087] Alternatively, the bottom wall 23 may have a plate-like structure with varying thickness; along the extension path from the second inlet channel 2-2 to the outlet 2-3, the thickness of the bottom wall 23 opposite to the second inlet channel 2-2 gradually decreases, so that the flow area of ​​the second inlet channel 2-2 gradually increases along the extension path from the second inlet channel 2-2 to the outlet 2-3.

[0088] Alternatively, both the top wall 21 and the bottom wall 23 may be plate-like structures with varying thicknesses; along the extension path from the second inlet channel 2-2 to the outlet 2-3, the thickness of the top wall 21 opposite to the second inlet channel 2-2 gradually decreases, and the thickness of the bottom wall 23 opposite to the second inlet channel 2-2 gradually decreases, so that the flow area of ​​the second inlet channel 2-2 gradually increases along the extension path from the second inlet channel 2-2 to the outlet 2-3.

[0089] Alternatively, the top wall 21 has a planar plate structure, and along the extension path from the second inlet channel 2-2 to the outlet 2-3, the width of the second inlet channel 2-2 gradually increases in the longitudinal direction where it intersects with the extension path from the second inlet channel 2-2 to the outlet 2-3, so that the flow area of ​​the second inlet channel 2-2 gradually increases along the extension path from the second inlet channel 2-2 to the outlet 2-3. Figure 1 , Figure 12 As shown.

[0090] Therefore, by setting a groove 211 on the side of the top wall 21 near the fan body 1, and forming a protrusion 3 by the bottom surface of the groove 211 protruding towards the fan body 1, and the first guide channel 2-1 corresponding to the jet hole 11 penetrating the top wall 21 and the protrusion 3 on the top wall 21, the high-speed airflow is ejected through the jet hole 11, passes through the gap 4-1 between the fan body 1 and the guide device 2, and is then injected into the guide device 2 through the first guide channel 2-1. During this process, the gas in the outer circumferential region of the area opposite the jet hole 11 and the protrusion 3 in the gap 4-1 is entrained. Since the outer circumferential region of the protrusion 3 is a groove 211 structure, it is equivalent to increasing the flow area of ​​the gas flow channel in the outer circumferential region of the area opposite the jet hole 11 and the protrusion 3, reducing the flow resistance, and allowing the outer circumferential gas to be entrained more quickly and timely and mixed with the high-speed gas jet to reduce the maximum velocity at the center of the jet, reduce the velocity distribution difference between the center and the edge of the airflow, and achieve the purpose of suppressing noise.

[0091] Furthermore, the jet generated by the jet hole 11 of the fan body 1 enters the corresponding first guide channel 2-1 through the gap 4-1 between the fan body 1 and the guide 2. It entrains the gas in the outer circumferential region of the area opposite the jet hole 11 and the protrusion 3 in the gap 4-1, forming a primary guide. This causes the flow direction to be deflected after the fluid enters the second guide channel 2-2. Although energy loss occurs, the airflow has high inertia after being rectified by the first guide channel 2-1, and can still maintain a certain momentum to flow through the second guide channel 2-2 and finally be ejected from the outlet 2-3 on the side wall 22. During this process, as the flow area of ​​the second drainage channel 2-2 gradually increases along the extension path from the second drainage channel 2-2 to the outlet 2-3, the airflow decelerates and recovers pressure while flowing through the second drainage channel 2-2, which can increase the flow rate. In addition, when the airflow flows through the second drainage channel 2-2, it will also have a pulling effect on the gas in the first drainage hole 2-4 or / and the second drainage hole 2-5, thereby generating secondary drainage, which will substantially increase the airflow that is finally ejected from the outlet 2-3 of the side wall 22, so as to improve the heat dissipation efficiency.

[0092] Example 2

[0093] The difference between Example 2 and Example 1 is that: at least one second drainage hole 2-5 is provided at the end of the sidewall 22 surrounding the drainage cavity away from the outlet 2-3. The second drainage hole 2-5 penetrates the sidewall 22 and communicates with the drainage port 2-2a of at least one second drainage channel 2-2. The drainage port 2-2a is located between the first drainage channel 2-1 corresponding to the second drainage channel 2-2 and the outlet 2-3. The drainage port 2-2a can be, but is not limited to, located on any side of the second drainage channel 2-2 in the circumferential direction. For example, the drainage port 2-2a can be located in the middle part of the second drainage channel 2-2. This is to make full use of the high inertia of the airflow after rectification by the first drainage channel 2-1, and to entrain more gas from the second drainage hole 2-5, thereby substantially increasing the airflow that is finally ejected from the outlet 2-3 of the sidewall 22, so as to improve the heat dissipation efficiency. Figures 13-14 As shown.

[0094] Example 3

[0095] The difference between this embodiment and Embodiment 1 or 2 is that: Figure 15 As shown, it also includes a partition plate 4. The fan body 1 is connected to the air intake 2 through the partition plate 4. The partition plate 4 can be specifically fixedly connected to the outer shell of the fan body 1.

[0096] The partition plate 4 consists of multiple partitions discretely disposed between the fan body 1 and the top wall 21. The multiple partitions can be distributed circumferentially along the fan body 1. The opening between two adjacent partitions forms a flow hole 41, which allows external ambient gas to enter the gap 4-1 between the fan body 1 and the duct 2.

[0097] Alternatively, the partition plate 4 may be a continuous partition plate 4 in a closed loop structure disposed between the fan body 1 and the top wall 21. The partition plate 4 may be annular. The partition plate 4 may have at least one hole structure or groove structure. The hole structure or groove structure constitutes a flow hole 41, which allows external ambient gas to enter the gap 4-1 between the fan body 1 and the duct 2.

[0098] This allows the fan body 1 and the air intake to be integrated into a single module.

[0099] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A side-spraying low-noise fan, characterized in that: Includes a fan body (1) and a flow guide (2) disposed on one or both sides of the fan body (1) with a gap (4-1), the flow guide (2) guiding the airflow generated by the fan body (1) to be ejected in a set direction; The fan body (1) is provided with at least two jet holes (11) on the side near the air intake (2), and the airflow generated by the fan body (1) is ejected through the jet holes (11); The drainer (2) includes a drain cavity formed by a top wall (21), a bottom wall (23) and a side wall (22) connecting the top wall (21) and the bottom wall (23). The drain cavity extends in a set direction and penetrates the side wall (22), and forms an outlet (2-3) at the penetration point of the side wall (22). The top wall (21) is located close to the fan body (1). The area of ​​the top wall (21) opposite to at least two jet holes (11) is respectively provided with a first drain channel (2-1) corresponding to the jet holes (11) and penetrating the top wall (21). The drainage cavity is provided with second drainage channels (2-2) that are distributed at intervals corresponding to the first drainage channel (2-1). The first drainage channel (2-1) and the corresponding second drainage channel (2-2) are connected. The second drainage channel (2-2) is connected to the outlet (2-3). The top wall (21) has at least one recessed groove (211) on the side near the fan body (1). The bottom of the recessed groove (211) protrudes towards the fan body (1) with a protrusion (3) corresponding to the first flow channel (2-1). The protrusion (3) is arranged around the outer periphery of the corresponding first flow channel (2-1). The outer contour line (3a) of the top surface of the protrusion (3) forms a central area. The orthographic projection of the jet hole (11) on the top wall (21) is entirely located within the corresponding central area.

2. The side-spray low-noise fan according to claim 1, characterized in that: The flow area of ​​the second diversion channel (2-2) gradually increases along the extension path from the second diversion channel (2-2) to the outlet (2-3).

3. The side-spray low-noise fan according to claim 1, characterized in that: The top surface of the protrusion (3) does not protrude from the side surface of the top wall (21) facing the fan body (1).

4. The side-spray low-noise fan according to claim 1, characterized in that: The flow area of ​​the first drainage channel (2-1) is greater than the flow area of ​​the jet hole (11) opposite to it.

5. The side-jet low-noise fan according to claim 4, characterized in that: The cross-sectional shape of the jet hole (11), the protrusion (3) and the first drainage channel (2-1) penetrating the protrusion (3) are all circular; The axial distance between the outlet end face of the jet hole (11) and the inlet end face of the first guide channel (2-1) is h. The diameter of the jet hole (11) is d1. The diameter of the first guide channel (2-1) opposite to the jet hole (11) is d2. The diameter of the outer contour line (3a) of the top surface of the protrusion (3) is d3. The maximum axial length of the first guide channel (2-1) is l. The jet angle formed by the airflow ejected from the jet hole (11) is α. The constraints are: 1.1≤d2 / d1≤1.7, 1.1≤d3 / d2≤1.9; (d2-d1) / 2(h+l) <arctan(α / 2)<(d2-d1) / 2h。 6. The side-spray low-noise fan according to claim 1, characterized in that: The inner peripheral edge of the top surface of the protrusion (3) is provided with an inner peripheral rounded corner transition area (31), or / and the outer peripheral edge of the top surface of the protrusion (3) is provided with an outer peripheral rounded corner transition area (31).

7. The side-spray low-noise fan according to claim 1, characterized in that: The side (33) of the protrusion (3) has a draft angle β, 5°≤β≤40°.

8. The side-jet low-noise fan according to any one of claims 1-7, characterized in that: At least one second drainage hole (2-5) is provided at one end of the sidewall (22) surrounding the drainage cavity away from the outlet (2-3). The second drainage hole (2-5) penetrates the sidewall (22) and communicates with the drainage port (2-2a) of at least one second drainage channel (2-2). The drainage port (2-2a) is located between the first drainage channel (2-1) corresponding to the second drainage channel (2-2) and the outlet (2-3).

9. The side-jet low-noise fan according to any one of claims 1-7, characterized in that: The top wall (21) has a first drainage area corresponding to the first drainage channel (2-1). The first drainage area is the adjacent area on the outer periphery of the corresponding first drainage channel (2-1) on the top wall (21). The first drainage area is located inside or outside the sink (211) and outside the protrusion (3). The bottom wall (23) has a second drainage area that corresponds one-to-one with the first drainage area, and the second drainage area and the corresponding first drainage area are directly opposite each other; At least one of the first drainage areas and / or at least one of the second drainage areas has a first drainage hole (2-4) that communicates with the second drainage channel (2-2).

10. The side-spray low-noise fan according to claim 9, characterized in that: The first drainage hole (2-4) is located in the region opposite to the extension path of the second drainage channel (2-2) toward the outlet (2-3).

11. The side-jet low-noise fan according to claim 9, characterized in that: Each of the second drainage channels (2-2) is individually connected to the first drainage hole (2-4), and the first drainage hole (2-4) is provided on the top wall (21).

12. The side-jet low-noise fan according to any one of claims 1-7, characterized in that: Each of the second drainage channels (2-2) is connected to the same outlet (2-3).

13. The side-jet low-noise fan according to any one of claims 1-7, characterized in that: The flow areas of at least two of the jet holes (11) are the same or different.

14. The side-jet low-noise fan according to any one of claims 1-7, characterized in that: It also includes a partition plate (4), through which the fan body (1) is connected to the air intake (2); The partition plate (4) consists of multiple partitions discretely disposed between the fan body (1) and the top wall (21). The opening between two adjacent partitions forms a flow hole (41), which allows external ambient gas to enter the gap (4-1) between the fan body (1) and the duct (2). Alternatively, the partition plate (4) is a continuous partition plate (4) with a closed-loop structure disposed between the fan body (1) and the top wall (21). The partition plate (4) is provided with at least one hole structure or groove structure, which constitutes a flow passage (41). The flow passage (41) allows external ambient gas to enter the gap (4-1) between the fan body (1) and the duct (2).

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