Side-spraying low-noise fan

Abstract

The invention relates to the technical field of heat dissipation devices, in particular to a side-spraying low-noise fan which comprises a fan body and a drainage device, a sinking groove is formed in the side, close to the fan body, of a top wall, a protruding part is formed in the sinking groove in a protruding mode, and high-speed airflow is sprayed out through jet flow holes, penetrates through a gap and then is sprayed into the drainage device through a first drainage channel; the flow of gas sprayed out of the flow outlet can be increased through high inertia, the heat dissipation efficiency is improved, high-speed gas flow can entrain gas in the peripheral direction of the area, opposite to the protruding part, of the jet flow hole in the gap, the sinking groove is formed in the peripheral direction of the protruding part, the through-flow area of a gas circulation channel adjacent to the peripheral direction of the area, opposite to the protruding part, of the jet flow hole is increased, and the flow resistance is reduced. And the peripheral gas can be rapidly and timely entrained and rapidly mixed with the high-speed gas jet flow to reduce the maximum speed of the jet flow center and reduce the speed distribution difference between the center and the edge of the gas flow, so that the purpose of suppressing noise is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation devices, and in particular to a side-spraying low-noise fan. Background Art

[0002] Placing micro fans as heat dissipation devices in the internal space of 3C electronic terminal products is believed to generate greater thermal benefits. Since 3C smart terminals are different from consumables, they have strict stability and reliability requirements for the devices configured in the internal space. For micro fans, ensuring sufficient flow output and reducing the noise of the device as much as possible during operation to avoid affecting the user experience are the key issues currently being concerned about in the industry.

[0003] Piezoelectric fans are typical representatives of micro-volume fans. Piezoelectric fans in the prior art are divided into two categories according to the outflow direction: forward spray type and side spray type. Compared with the forward spray fan, the side spray fan has a lateral air outlet, the heat source is set in the outflow direction of the fan, and the thickness direction dimension is easy to control, which provides great convenience for its installation and arrangement in the narrow space of 3C products. The side spray fan can be composed of a forward spray fan and a flow guide, wherein the flow guide is arranged at intervals on at least one side of the fan, and the airflow is forwardly ejected from the forward spray fan and deflected after entering the flow guide. It is precisely because the direction of the airflow is inconsistent with the final outflow direction of the airflow that the airflow needs to be deflected at a large angle in the space, which will cause energy loss in the process, resulting in insufficient airflow flow ejected from the lateral air outlet, and the purpose of efficient heat dissipation cannot be achieved. At the same time, the high-speed airflow passes through the gap between the fan and the flow guide and is sprayed into the flow guide through the inlet set on the flow guide. Due to the large difference in velocity distribution at the center and edge of the airflow, harsh noise will also be generated. 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-spraying fan in the prior art has insufficient lateral outflow and generates noise, a side-spraying low-noise fan is provided.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a side-spray low-noise fan, comprising a fan body and a flow guider arranged on one side or both sides of the fan body with a gap, wherein the flow guider guides the airflow generated by the fan body to be sprayed toward a set direction;

[0006] At least two jet holes are provided on one side of the fan body close to the flow guider, and the airflow generated by the fan body is ejected through the jet holes;

[0007] The flow guider comprises a flow guide cavity surrounded by a top wall, a bottom wall and a side wall connected between the top wall and the bottom wall, the flow guide cavity extends in a set direction and penetrates the side wall, and forms a flow outlet at the penetration of the side wall, the top wall is arranged close to the fan body, and the regions of the top wall opposite to the at least two jet holes are respectively provided with first flow guide channels corresponding to the jet holes one by one and penetrating the top wall;

[0008] Second drainage channels corresponding to the first drainage channels are spaced apart in the drainage cavity, the first drainage channel is connected to the corresponding second drainage channel, and the second drainage channel is connected to the outlet;

[0009] At least one groove is formed on one side of the top wall close to the fan body, and a protrusion corresponding to the first drainage channel protrudes from the bottom of the groove toward the fan body. The protrusion is arranged around the outer periphery of the corresponding first drainage channel, and the outer contour line of the top surface of the protrusion encloses a central area, and the orthographic projections of the jet holes on the top wall are all located in the relative central area.

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

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

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

[0013] Furthermore, the cross-sectional shapes of the jet hole, the protrusion and the first drainage channel passing through 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 drainage channel is h, the diameter of the jet hole is d1, the diameter of the first drainage 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 drainage channel is l, and the injection 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 zone, or / and the outer peripheral edge of the top surface of the protrusion is provided with an outer peripheral rounded corner transition zone.

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

[0020] Furthermore, at least one second drainage hole is provided at one end of the side wall surrounding the drainage cavity away from the outlet, the second drainage hole passes through the side wall and is connected to the drainage port of at least one of the second drainage channels, and 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 one by one, the first drainage area is an adjacent area on the top wall arranged on the outer peripheral side of the corresponding first drainage channel, and the first drainage area is located inside or outside the sinking groove and outside the protrusion;

[0022] The bottom wall has a second drainage area corresponding to the first drainage area one by one, and the second drainage area is directly opposite to the corresponding first drainage area;

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

[0024] Furthermore, the first drainage hole is located in a region opposite to an 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 holes are all arranged on the top wall.

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

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

[0028] Furthermore, it also includes a partition plate, and the fan body is connected to the flow guider through the partition plate;

[0029] The partition plate is a plurality of partitions discretely arranged between the fan body and the top wall, and the opening between two adjacent partitions constitutes a through hole, and the through hole allows external ambient gas to enter the gap between the fan body and the flow guider;

[0030] Alternatively, the partition plate is a continuous partition plate in a closed-loop structure arranged between the fan body and the top wall, and at least one hole structure or groove structure is arranged on the partition plate, and the hole structure or groove structure constitutes a flow hole, and the flow hole allows external environmental gas to enter the gap between the fan body and the deflector.

[0031] The beneficial effects of the present invention are:

[0032] 1) In the present invention, a groove is provided on one side of the top wall close to the fan body, and a protrusion is formed by the bottom surface of the groove protruding toward one side of the fan body, and a first guide channel corresponding to the jet hole runs through the top wall and the protrusion on the top wall, so that in the process of high-speed airflow being ejected through the jet hole, passing through the gap between the fan body and the guide device and then being ejected into the guide device through the first guide channel, the gas in the outer circumference of the relative area between the jet hole and the protrusion in the gap is sucked in. Since the outer circumference of the protrusion is a groove structure, the flow area of ​​the gas flow channel in the outer circumference of the relative area between the adjacent jet hole and the protrusion is increased, and the flow resistance is reduced. The gas in the outer circumference can be sucked in more quickly and timely and quickly mixed with the high-speed gas jet to reduce the maximum velocity of the jet center, reduce the velocity distribution difference between the center and the edge of the airflow, and achieve the purpose of suppressing noise.

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

[0034] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

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

[0037] Figure 2 It is a schematic diagram of the cooperation between the protrusions, the first drainage channel and the jet holes when all the protrusions are arranged in the same sink;

[0038] Figure 3 It is a schematic diagram showing that when all the protrusions are arranged in the same sink, the orthographic projections of the jet holes on the top wall are all located in the relative central area (the dotted lines in the figure represent the orthographic projections of the jet holes on the top wall);

[0039] Figure 4 It is a schematic diagram of the cooperation between the protrusion, the first drainage channel and the jet hole when each protrusion is respectively arranged in an independent sink;

[0040] Figure 5It is a schematic diagram of the cooperation between the protrusion, the first drainage channel and the jet hole when each protrusion is respectively arranged in an independent sink (the dotted line in the figure represents the orthographic projection of the jet hole on the top wall)

[0041] Figure 6 It is a schematic diagram of the structural dimension relationship between the jet hole, the protruding portion and the first drainage channel;

[0042] Figure 7 It is a schematic diagram of the inner and outer edges of the top surface of the protrusion respectively providing an inner peripheral rounded corner transition zone and an outer peripheral rounded corner transition zone;

[0043] Figure 8 is a schematic diagram showing that the side surface of the protrusion has a draft angle;

[0044] Fig. 9 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] Fig.10 is a schematic diagram of the jet hole, the first drainage channel and the first drainage hole projected on the cross section of the side wall and having multiple outlets;

[0046] Fig.11 is a schematic diagram of a flow diverter with a top wall having a plate-like structure with variable thickness;

[0047] Fig.12 is a cross-sectional schematic diagram of a flow guider in which the width dimension of the second flow guide channel in the longitudinal direction intersecting with the extension path space of the second flow guide channel toward the outlet gradually increases;

[0048] Fig.13 is a schematic diagram of a drainage device provided with a second drainage hole;

[0049] Fig.14 is a schematic diagram of a drainage device provided with a first drainage hole and a second drainage hole;

[0050] Fig.15 It is a schematic diagram of a side-spraying low-noise fan provided with a partition plate according to the present invention.

[0051] In the figure: 1, fan body, 11, jet hole;

[0052] 2. Drainage device, 21. Top wall, 211. Sink, 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 zone, 32. outer peripheral rounded corner transition zone, 33. side surface;

[0054] 4. separator plate, 41. through-hole, 4-1. gap;

[0055] h, the axial distance between the outflow end face of the jet hole and the inflow end face of the first guide channel;

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

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

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

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

[0060] α, the spray angle formed by the airflow ejected from the jet hole;

[0061] β. Draft angle of the protrusion side. DETAILED DESCRIPTION

[0062] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0063] Example 1

[0064] like Figures 1 to 12 As shown, a side-spray low-noise fan comprises a fan body 1 and a flow guider 2 arranged on one side or both sides of the fan body 1 with a gap 4-1 therebetween, wherein the flow guider 2 guides the airflow generated by the fan body 1 to be ejected toward a set direction, and the set direction refers to the direction in which the outlet 2-3 of the side-spray low-noise fan of this embodiment is toward a heat source, so as to achieve heat dissipation of the heat source by using the side-spray low-noise fan of this embodiment;

[0065] At least two jet holes 11 are provided on one side of the fan body 1 close to the guide device 2. The flow areas of the at least two jet holes 11 may be the same or different. In the present embodiment, the cross-sectional shape of the jet hole 11 is circular, and the flow areas of the at least two jet holes 11 are the same for illustration, but this does not constitute a limitation to the present invention. The fan body 1 in the present embodiment may adopt any fan having at least two air outlets in the prior art, and in particular, may adopt any piezoelectric fan having at least two air outlets in the prior art. The fan body 1 The airflow generated by the fan body 1 is ejected from the air outlet, and the air outlet 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 the Chinese patent with publication number CN119084287A, and the hole portion in the patent corresponds to the jet hole 11 in this embodiment; the fan body 1 in this embodiment may also adopt the high-order resonance fluid generating device disclosed in the Chinese patent with publication number CN118979867A, and the hole portion in the 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 deflector 2 includes a deflection cavity surrounded by a top wall 21, a bottom wall 23 and a side wall 22 connected between the top wall 21 and the bottom wall 23, the deflection cavity extends in a set direction and penetrates the side wall 22, and forms an outlet 2-3 at the penetration of the side wall 22, the top wall 21 is arranged close to the fan body 1, and the areas of the top wall 21 opposite to at least two jet holes 11 are respectively provided with first deflection channels 2-1 corresponding to the jet holes 11 and penetrating the top wall 21; the cross-sectional shapes of the first deflection channel 2-1 and the protrusion 3 can be circular, square, rectangular, elliptical or other shapes, which are not limited here;

[0067] At least one groove 211 is provided on one side of the top wall 21 close to the fan body 1, that is, the groove 211 is a groove structure on the surface of one side of the top wall 21 close to the fan body 1, which is concave toward the side away from the fan body 1. The bottom of the groove 211 protrudes toward the fan body 1 with a protrusion 3 corresponding to the first drainage channel 2-1. The protrusion 3 is arranged around the outer periphery of the corresponding first drainage channel 2-1. The top surface outer contour line 3a of the protrusion 3 encloses a central area. The top surface of the protrusion 3 is the surface of one side of the protrusion 3 close to the fan body 1. The orthographic projections of the jet holes 11 on the top wall 21 are all located in the relative central area, which is equivalent to that the area of ​​the central area opposite to the fan body 1 covers the corresponding jet holes 11. It is not difficult to understand that there can be only one groove 211, and all the protrusions 3 are arranged in the groove 211, such as Figure 2-3 As shown, Figure 3The dotted line in the figure represents the positive projection of the jet hole 11 on the top wall 21; of course, there may be multiple sinks 211, for example, the protrusions 3 are arranged in a one-to-one correspondence with the jet holes 11, and each protrusion 3 is arranged in an independent sink 211, such as Figure 4 and 5 As shown, Figure 5 The dotted line in represents the orthographic projection of the jet hole 11 on the top wall 21 .

[0068] Preferably, the top surface of the protrusion 3 does not protrude from the side surface of the top wall 21 facing the fan body 1, that is, the height of the protrusion 3 almost does not exceed the side surface of the top wall 21 facing the fan body 1. Of course, considering the processing error in actual engineering, the height of the protrusion 3 slightly exceeds the side surface of the top wall 21 facing the fan body 1 and is also considered to almost not exceed. Specifically, the top surface of the protrusion 3 can be coplanar with the side surface of the top wall 21 close to 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 thereto; the cross-sectional shapes of the jet hole 11, the protrusion 3 and the first drainage channel 2-1 passing through the protrusion 3 are all circular to describe the structural size relationship between the orifices, channels and protrusions 3;

[0070] Assume that the axial distance between the outlet end face of the jet hole 1 and the inlet end face of the first drainage channel 2-1 is h, the diameter of the jet hole 11 is d1, the diameter of the first drainage 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 drainage channel 2-1 is l, and the injection angle formed by the airflow ejected from the jet hole 11 is α, as shown in FIG. 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 received by the first guide channel 2-1 opposite thereto, thereby avoiding flow loss caused by airflow overflow; on the other hand, it can improve the compactness of the structure.

[0075] It is more ideal that the inner edge of the top surface of the protrusion 3 is provided with an inner peripheral rounded corner transition zone 31, or the outer peripheral edge of the top surface of the protrusion 3 is provided with an outer peripheral rounded corner transition zone 31, or the top surface of the protrusion 3 is provided with both the inner peripheral rounded corner transition zone 31 and the outer peripheral rounded corner transition zone 31; thereby reducing the flow resistance of the airflow when it flows against the wall, and suppressing the gas turbulence that may occur at the right angle position, such as Figure 7 shown.

[0076] It is more ideal that the side surface 33 of the protrusion 3 has a draft angle β, 5°≤β≤40°, and the side surface 33 of the protrusion 3 can have a draft angle β on one side or more than two sides, or all side surfaces 33 can have a draft angle β, such as Figure 8 As shown, this facilitates demoulding when using the injection molding process.

[0077] In addition, second drainage channels 2-2 corresponding to the first drainage channels 2-1 are distributed in the drainage cavity at intervals, the first drainage channel 2-1 is connected to the corresponding second drainage channel 2-2, and the second drainage channel 2-2 is connected to the outlet 2-3. It can be that each second drainage channel 2-2 is connected to the same outlet 2-3. Fig. 9 As shown, the drainage cavity may also extend in a set direction and penetrate the side wall 22 to form a plurality of outlets 2-3, and the second drainage channels 2-2 are respectively connected to the corresponding outlets 2-3, such as Fig.10 As shown; there may even be multiple outlets 2-3, and the same outlet 2-3 may be connected to one or two or more second drainage channels 2-2.

[0078] The flow area of ​​the second drainage channel 2-2 tends to gradually increase along the extension path from the second drainage channel 2-2 to the outlet 2-3, so that the airflow can be decelerated and the pressure can be restored while flowing through the second drainage channel 2-2, thereby increasing the flow rate.

[0079] It is not difficult to understand that the jet hole 11 arranged on the fan body 1 is opposite to the top wall 21 of the deflector 2, and the outlet 2-3 is arranged on the side wall 22 that surrounds the deflection 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 deflector 2, so that the fan of this embodiment has the function of lateral jet.

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

[0081] The bottom wall 23 has second drainage areas corresponding to the first drainage areas one by one, and the second drainage areas are directly opposite to the corresponding first drainage areas;

[0082] At least one of the first drainage areas and / or at least one of the second drainage areas is penetrated by a first drainage hole 2-4 connected to the second drainage channel 2-2; that is, the first scheme is: the first drainage area is penetrated by the first drainage hole 2-4 connected to the second drainage channel 2-2, the second scheme is: the second drainage area is penetrated by the first drainage hole 2-4 connected to the second drainage channel 2-2, and the third scheme is: the first drainage area is penetrated by the first drainage hole 2-4 connected to the second drainage channel 2-2, and the second drainage area is also penetrated by the first drainage hole 2-4 connected to the second drainage channel 2-2; in this way, by arranging the first drainage hole 2-4 in the adjacent area of ​​the first drainage channel 2-1 corresponding to the second drainage channel 2-2, the technical effect that can be achieved is to make full use of the high inertia of the airflow after being rectified 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, such as Figure 1 , Figure 9-10 shown.

[0083] Preferably, the first drainage hole 2-4 is located in the first drainage area or / and the second drainage area in an 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 extension path direction of the second drainage channel 2-2 toward the outlet 2-3. Wherein, when the first drainage hole 2-4 is arranged on the bottom wall 23, it is staggered with the first drainage channel 2-1, that is, when the first drainage hole 2-4 is arranged on the bottom wall 23, the first drainage hole 2-4 is not arranged opposite to the first drainage channel 2-1;

[0084] Further preferably, each second drainage channel 2-2 is equipped with a first drainage hole 2-4, and the first drainage holes 2-4 are arranged on the top wall 21. Fig.11 shown.

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

[0086] The top wall 21 is a plate-like structure with a variable thickness; along the extension path from the second drainage channel 2-2 to the outlet 2-3, the thickness of the top wall 21 opposite to the second drainage channel 2-2 gradually decreases, so that 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, as shown in FIG. Fig.11 As shown;

[0087] Alternatively, the bottom wall 23 is a plate-like structure with variable thickness; along the extension path from the second drainage channel 2-2 to the outlet 2-3, the thickness of the bottom wall 23 opposite to the second drainage channel 2-2 gradually decreases, so that 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;

[0088] Alternatively, both the top wall 21 and the bottom wall 23 are plate-like structures with variable thickness; along the extension path from the second drainage channel 2-2 to the outlet 2-3, the thickness of the top wall 21 opposite to the second drainage channel 2-2 gradually decreases, and the thickness of the bottom wall 23 opposite to the second drainage channel 2-2 gradually decreases, so that the flow area of ​​the second drainage channel 2-2 tends to gradually increase along the extension path from the second drainage channel 2-2 to the outlet 2-3;

[0089] Alternatively, the top wall 21 is a planar plate-like structure, and along the extension path from the second drainage channel 2-2 to the outlet 2-3, the width dimension of the second drainage channel 2-2 in the longitudinal direction intersecting with the extension path space of the second drainage channel 2-2 to the outlet 2-3 gradually increases, so that the flow area of ​​the second drainage channel 2-2 tends to gradually increase along the extension path from the second drainage channel 2-2 to the outlet 2-3, such as Figure 1 , Fig.12 shown.

[0090] Therefore, by setting a groove 211 on the side of the top wall 21 close to the fan body 1, and the bottom surface of the groove 211 protrudes toward the side of the fan body 1 to form a protrusion 3, and the first guide channel 2-1 corresponding to the jet hole 11 passes through the top wall 21 and the protrusion 3 on the top wall 21, so that 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 then is ejected into the guide device 2 through the first guide channel 2-1. In the process, the gas in the outer circumference of the relative area of ​​the jet hole 11 and the protrusion 3 in the gap 4-1 is sucked in. Since the outer circumference 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 circumference of the relative area of ​​the adjacent jet hole 11 and the protrusion 3, and reducing the flow resistance. The gas in the outer circumference can be sucked in more quickly and timely and quickly mixed with the high-speed gas jet to reduce the maximum velocity of the jet center, reduce the velocity distribution difference between the center and the edge of the airflow, and achieve the purpose of suppressing noise.

[0091] In addition, the jet generated by the jet hole 11 of the fan body 1 enters the corresponding first drainage channel 2-1 through the gap 4-1 between the fan body 1 and the guide device 2, and the gas in the peripheral direction of the area outside the gap 4-1 opposite to the jet hole 11 and the protrusion 3 is sucked to form a primary drainage, so that the flow direction of the fluid is deflected after entering the second drainage channel 2-2. Although energy loss occurs, the airflow has high inertia after being rectified by the first drainage channel 2-1, and can still maintain a certain momentum to flow through the second drainage channel 2-2 and finally be ejected from the outlet 2-3 on the side wall 22. In this process, since the flow area of ​​the second drainage channel 2-2 tends to gradually increase along the extension path from the second drainage channel 2-2 to the outlet 2-3, the airflow slows down and restores the pressure when 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 and / or the second drainage hole 2-5, thereby generating secondary drainage, thereby substantially increasing the amount of air 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 one end of the side wall 22 that encloses the drainage cavity and is away from the outlet 2-3. The second drainage hole 2-5 penetrates the side wall 22 and is connected with the drainage hole 2-2a of at least one second drainage channel 2-2. The drainage hole 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 hole 2-2a can be but is not limited to being located on any side of the circumference of the second drainage channel 2-2 where it is located. For example, the drainage hole 2-2a can be located in the middle part of the second drainage channel 2-2; so as to make full use of the high inertia of the airflow after being rectified by the first drainage channel 2-1, and to draw more gas from the second drainage hole 2-5, thereby substantially increasing the amount of airflow finally ejected from the outlet 2-3 of the side wall 22, so as to improve the heat dissipation efficiency, such as Figure 13-14 shown.

[0094] Example 3

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

[0096] The partition plate 4 is a plurality of partitions discretely arranged between the fan body 1 and the top wall 21. The plurality of partitions may be spaced apart along the circumference of the fan body 1. The opening between two adjacent partitions constitutes a through hole 41. The through hole 41 allows external ambient gas to enter the gap 4-1 between the fan body 1 and the flow guider 2.

[0097] Alternatively, the partition plate 4 is a continuous partition plate 4 in a closed-loop structure arranged between the fan body 1 and the top wall 21. The partition plate 4 may be in a circular ring shape, and at least one hole structure or groove structure is arranged on the partition plate 4. The hole structure or groove structure constitutes a flow hole 41, and the flow hole 41 allows external ambient gas to enter the gap 4-1 between the fan body 1 and the guide device 2.

[0098] Thus, the fan body 1 and the drainage can be constructed into an integral module.

[0099] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A side-spray low-noise fan, characterized in that: It comprises a fan body (1) and a flow guider (2) arranged on one side or both sides of the fan body (1) with a gap (4-1) therebetween, wherein the flow guider (2) guides the airflow generated by the fan body (1) to be ejected in a set direction; At least two jet holes (11) are provided on one side of the fan body (1) close to the flow guider (2), and the airflow generated by the fan body (1) is ejected through the jet holes (11); The flow guider (2) comprises a flow guide cavity surrounded by a top wall (21), a bottom wall (23) and a side wall (22) connected between the top wall (21) and the bottom wall (23); the flow guide cavity extends in a set direction and penetrates the side wall (22), and forms a flow outlet (2-3) at the penetration point of the side wall (22); the top wall (21) is arranged close to the fan body (1); and the regions of the top wall (21) opposite to the at least two jet holes (11) are respectively provided with first flow guide channels (2-1) corresponding to the jet holes (11) one by one and penetrating the top wall (21); Second drainage channels (2-2) corresponding to the first drainage channels (2-1) are distributed in the drainage cavity at intervals, the first drainage channel (2-1) is communicated with the corresponding second drainage channel (2-2), and the second drainage channel (2-2) is communicated with the outlet (2-3); At least one recessed groove (211) is provided on a side of the top wall (21) close to the fan body (1); a protrusion (3) corresponding to the first flow guide channel (2-1) protrudes from the bottom of the recessed groove (211) toward the fan body (1); the protrusion (3) is arranged around the outer periphery of the corresponding first flow guide channel (2-1); the outer contour line (3a) of the top surface of the protrusion (3) encloses a central area; and the orthographic projections of the jet holes (11) on the top wall (21) are all located in the relative central area.

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

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

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

5. The side-spraying low-noise fan according to claim 4, characterized in that: The cross-sectional shapes of the jet hole (11), the protruding portion (3) and the first drainage channel (2-1) passing through the protruding portion (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 drainage channel (2-1) is h, the diameter of the jet hole (11) is d1, the diameter of the first drainage 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 drainage channel (2-1) is l, and the injection 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-spraying low-noise fan according to claim 1, characterized in that: The inner peripheral edge of the top surface of the protruding portion (3) is provided with an inner peripheral rounded corner transition zone (31), or / and the outer peripheral edge of the top surface of the protruding portion (3) is provided with an outer peripheral rounded corner transition zone (31).

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

8. The side-spray low-noise fan according to any one of claims 1 to 7, characterized in that: At least one second drainage hole (2-5) is provided at one end of the side wall (22) that surrounds the drainage cavity and is away from the outlet (2-3); the second drainage hole (2-5) passes through the side wall (22) and is connected to a drainage hole (2-2a) of at least one of the second drainage channels (2-2); the drainage hole (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-spray low-noise fan according to any one of claims 1 to 7, characterized in that: The top wall (21) has a first drainage area corresponding to the first drainage channel (2-1) one by one, the first drainage area is an adjacent area on the top wall (21) arranged on the outer peripheral side of the corresponding first drainage channel (2-1), and the first drainage area is located inside the trough (211) or outside the trough (211) and outside the protrusion (3); The bottom wall (23) has a second drainage area corresponding to the first drainage area one by one, and the second drainage area and the corresponding first drainage area are directly opposite; At least one of the first drainage areas and / or at least one of the second drainage areas is penetrated by a first drainage hole (2-4) that is in communication with the second drainage channel (2-2).

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

11. The side-spraying 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 holes (2-4) are all arranged on the top wall (21).

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

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

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

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